A flood discharge gate metal structure construction method for accelerating the construction progress of a gate dam project

Abstract

A method for constructing the metal structure of a flood discharge gate to accelerate the construction progress of a dam project includes the following steps: Step S1: Using a first-phase closed water-retaining structure, a first closed area is formed on one side of the river channel. Within this first closed area, the gate piers of the first-phase flood discharge gate are poured, and the embedded metal structural components within the height range of the gate pier pouring are installed. Step S2: The first-phase flood discharge gate is used for flood control, while a second-phase closed water-retaining structure is used to form a second closed area on the other side of the river channel. Within this second closed area, the metal structure of the second-phase flood discharge gate is constructed, and the remaining concrete pouring of the gate piers of the first-phase flood discharge gate and the installation of the embedded metal structural components are completed during the dry season. Step S3: After the second-phase flood discharge gate has been used for flood control, all arc-shaped gates and their opening and closing equipment in the first-phase flood discharge gate are installed. The method provided by this invention ensures good coordination of the entire dam project construction schedule, thereby accelerating the dam project construction progress and enabling earlier power generation to create better economic benefits.

Description

Technical Field

[0001] This invention relates to the field of metal structure technology for water conservancy and hydropower engineering, and in particular to a method for constructing metal structures to accelerate the construction progress of dam and gate projects. Background Technology

[0002] Dam projects are generally located in the middle and lower reaches of rivers where the terrain is relatively flat. They are typically run-of-river power plants without regulation capabilities, and their main facilities for flood discharge and construction diversion are floodgates. Dam projects generally use low-head turbine units, currently mainly axial-flow and bulb turbine units. During the installation of the units, floodgates are needed to ensure safe passage through the flood season; otherwise, the powerhouse will be flooded. During the commissioning of the units, the floodgates are needed to retain water for commissioning; otherwise, the units will not be able to complete normal commissioning due to insufficient flow. Therefore, the installation schedule of the floodgate metal structure must take into account both flood control and water retention requirements and be compatible with the construction of the powerhouse. Otherwise, the construction period will be delayed, affecting power generation. Thus, the installation period of the floodgate metal structure and the rationality of the technical solution have a significant impact on the construction period of the dam project.

[0003] For floodgates, the traditional method involves constructing earth-rock cofferdams upstream and downstream and longitudinally to sequentially complete the excavation of the floodgate foundation pit, the concrete pouring of the gate piers, and the installation and commissioning of the metal structure. After breaching the cofferdam, the water is diverted through the floodgate. Similarly, the same method is used to sequentially complete the excavation of the powerhouse foundation pit, the concrete pouring of the gate piers, and the installation and commissioning of the metal structure through the same upstream and downstream and longitudinally constructed earth-rock cofferdams. This method has little impact on the overall construction period of the floodgate project for small-scale floodgates with minimal metal structure installation work, as the construction period for the floodgate is short. However, for large-scale floodgates with numerous gate openings and extensive metal structure installation, the time required to complete the floodgate construction, breach the cofferdam, and divert the water is long, leading to a longer time before the entire project is completed and ready for power generation, thus affecting the power plant's power generation efficiency. Therefore, the existing technology has shortcomings and needs further improvement. Summary of the Invention

[0004] The main objective of this invention is to propose a construction method for the metal structure of a flood discharge gate that can accelerate the construction progress of dam projects, thereby solving the aforementioned technical problems.

[0005] To achieve the above objectives, this invention proposes a construction method for the metal structure of a flood discharge gate to accelerate the construction progress of a dam project, comprising the following steps:

[0006] Step S1: Use the first phase closed water-retaining structure to enclose the first closed area on one side of the river channel, and carry out the pouring of the gate piers inside the first phase flood discharge gate within the first closed area, as well as the installation of the metal structure embedded parts within the pouring height range of the gate piers.

[0007] Step S2: Use the first-phase floodgate for flood passage, and at the same time use the second-phase closed water-retaining structure to enclose a second closed area on the other side of the river. Carry out the construction of the metal structure of the second-phase floodgate in the second closed area, and complete the remaining concrete pouring of the gate piers of the first-phase floodgate and the installation of the embedded parts of the internal metal structure during the dry season.

[0008] Step S3: After the second-phase floodgate is used to pass through the flood season, complete the installation of all arc gates and their opening and closing equipment in the first-phase floodgate.

[0009] Preferably, in step S1, before construction, the number of gate openings of the first-phase flood discharge gate that meet the flood discharge flow requirements for flood diversion during the construction period and the height H of the gate piers to meet the requirements for pouring during the dry season are first determined. The pouring height of the gate piers meets the requirement of being exposed above the water surface throughout the dry season and a sufficient number of exposed reinforcing bars are reserved.

[0010] Preferably, in step S1, the embedded parts within the height range of the gate pier include the emergency gate slot embedded part and the arc gate slot embedded part; in step S3, an emergency gate is also installed in the emergency gate slot embedded part of the first-phase flood discharge gate.

[0011] Preferably, in step S1, the embedded parts within the casting height range of the gate pier also include the embedded parts of the downstream water-retaining gate slot; in step S3, the downstream water-retaining gate is also installed in the embedded parts of the downstream water-retaining gate slot of the first-phase flood discharge gate.

[0012] Preferably, in step S1, a diversion channel is excavated near one of the riverbanks on the river channel, and a longitudinal earth-rock cofferdam is set along the diversion channel near the center of the river channel. An upstream first-phase cofferdam and a downstream first-phase cofferdam are set at the upstream and downstream ends of the diversion channel, respectively. One of the riverbanks, the longitudinal earth-rock cofferdam, the upstream first-phase cofferdam, and the downstream first-phase cofferdam together constitute the first-phase closed water-retaining structure. The first-phase floodgate is located inside the diversion channel. The height of the longitudinal earth-rock cofferdam is sufficient to prevent overtopping during the flood season when the first-phase floodgate is filled.

[0013] Preferably, in step S2, when using the first-phase floodgate for flood passage, the upstream and downstream first-phase cofferdams are destroyed; upstream and downstream second-phase cofferdams are respectively set at the upstream and downstream ends of the longitudinal earth-rock cofferdam; the longitudinal earth-rock cofferdam, the upstream and downstream second-phase cofferdams, and the riverbank on the other side of the river channel together constitute the second-phase closed water-retaining structure; in step S3, when using the second-phase floodgate for flood passage, the upstream and downstream second-phase cofferdams are destroyed.

[0014] Preferably, a three-stage cofferdam is installed in the downstream section of the diversion channel.

[0015] Preferably, in step S2, during the construction of the metal structure of the second-phase flood discharge gate, the metal structure includes an emergency gate slot embedded part inside the gate pier of the second-phase flood discharge gate, an arc gate slot embedded part, an emergency gate set in the emergency gate slot embedded part, an arc gate set in the arc gate slot embedded part, a dam top gantry crane installed at the dam top position, and a hydraulic press installed between the gate pier and the arc gate.

[0016] Preferably, in step S2, during the construction of the metal structure of the second-phase flood discharge gate, the metal structure also includes a downstream water-retaining gate slot embedded part inside the gate pier of the second-phase flood discharge gate, a downstream water-retaining gate set in the downstream water-retaining gate slot embedded part, and a downstream gantry crane or downstream trolley installed on the top of the downstream water-retaining gate. The downstream gantry crane or downstream trolley is used to operate the downstream water-retaining gate.

[0017] Preferably, in step S2, the construction of the plant is also carried out within the second-phase closed water-retaining structure, and upstream gates and downstream gates of the unit are respectively set on the upstream and downstream sides of the plant to retain water for the installation and commissioning of electromechanical equipment in the plant.

[0018] Optionally, a construction method for the metal structure of a flood discharge gate to accelerate the construction progress of a dam project includes the following steps:

[0019] Step T1: The first closed area is enclosed on one side of the river channel using the first-phase closed water-retaining structure. Within this first closed area, the gate piers of the first-phase flood discharge gate are poured. The upstream gate slot, the arc-shaped gate slot, and the downstream gate slot are sequentially installed in the gate piers along the direction of water flow. The upstream gate is installed in the upstream gate slot and the downstream gate is installed in the downstream gate slot. The upstream gate is operated by a dam top gantry crane, and the downstream gate is operated by a downstream gantry crane.

[0020] Step T2: In the first-phase floodgate, water is blocked one by one through the upstream and downstream water-blocking gates. The arc-shaped gate is installed in the embedded part of the arc-shaped gate slot, and the hydraulic press between the arc-shaped gate and the gate pier is installed and debugged.

[0021] Step T3: Use the first-phase floodgate for flood passage, and use the second-phase closed water-retaining structure to enclose a second closed area on the other side of the river. Carry out the construction of the second-phase floodgate and powerhouse within the second closed area, and then demolish the second-phase closed water-retaining structure after the construction is completed.

[0022] Preferably, in step T1, the first-phase closed water-retaining structure is a longitudinal earth-rock cofferdam set in the river channel, an upstream first-phase cofferdam and a downstream first-phase cofferdam set at the upstream and downstream ends of the longitudinal earth-rock cofferdam, and one side of the riverbank together forming a closed structure.

[0023] Preferably, in step T3, the second-phase closed water-retaining structure is a closed structure formed by a longitudinal guide wall, an upstream second-phase cofferdam and a downstream second-phase cofferdam, and the riverbank on the other side of the river channel.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) The entire floodgate of the dam project is divided into two phases for construction planning, which are carried out separately or in combination, according to the flood discharge requirements for flood diversion during the flood season. The metal structure is installed and debugged in different phases and parts according to the scale of the dam project and the type of floodgate opening. While meeting the requirements for flood diversion during the flood season, the overall construction schedule of the dam project is well coordinated, which can accelerate the construction progress of the dam project and realize early power generation to create better economic benefits.

[0026] (2) When the floodgate is relatively high and adopts a submerged gate type, the construction of the floodgate metal structure shall be carried out in the order of time, step S1, step S2 and step S3. Step S1: The first closed area is formed on one side of the river channel by using the first phase closed water-retaining structure. The gate piers of the first phase floodgate are poured in the first closed area, and the metal structure embedded parts within the pouring height range of the gate piers are installed. Since the pouring height of the first phase floodgate only needs to meet the flood control requirements, it is not necessary to pour it to the top of the dam. Therefore, the time used to pour the first phase floodgate to the flood control height of the dam top can be used to carry out the construction of the second closed area, which effectively speeds up the construction progress of the project. Step S2: Utilize the first-phase floodgate for flood control, while simultaneously using the second-phase enclosed water-retaining structure to create a second enclosed area on the other side of the river. Within this second enclosed area, construct the metal structure of the second-phase floodgate. During the dry season, complete the remaining concrete pouring for the gate piers of the first-phase floodgate and the installation of its internal metal structure embedded parts. Because the first and second-phase floodgates can be constructed simultaneously during the dry season, this allows for the completion of the remaining concrete pouring height, metal structure embedded parts, and the installation and commissioning of the planar gates and their opening and closing equipment for the first-phase floodgate without affecting the construction period of the second enclosed area, thus effectively shortening the project construction period. Step S3: After utilizing the second-phase floodgate for flood control, complete the installation of all arc-shaped gates and their opening and closing equipment in the first-phase floodgate. Since the installation time for all arc-shaped gates and their opening and closing equipment in the first-phase floodgate is usually less than the powerhouse construction time, this method does not affect the powerhouse construction progress, thereby achieving the goal of accelerating the dam project construction progress and generating electricity ahead of schedule.

[0027] (3) When the flood discharge gate adopts the surface gate type, the construction of the flood discharge gate metal structure shall be carried out in the order of time, step T1, step T2 and step T3. Step T1: The first closed area is formed on one side of the river channel by using the first phase closed water-retaining structure. The gate piers of the first phase flood discharge gate are poured in the first closed area, and the upstream water-retaining gate slot embedded part, the arc gate slot embedded part and the downstream water-retaining gate slot embedded part are installed in the gate pier along the direction of water flow. The upstream water-retaining gate is installed in the upstream water-retaining gate slot embedded part, and the downstream water-retaining gate is installed in the downstream water-retaining gate slot embedded part. The upstream water-retaining gate is operated by the dam top gantry crane, and the downstream water-retaining gate is operated by the downstream gantry crane. Since the first phase flood discharge gate does not need to install the arc gate and opening and closing equipment, the construction period can be effectively shortened. Step T2: Within the first-phase floodgate, water is blocked one by one using the upstream and downstream water-retaining gates. The arc-shaped gates are installed within the embedded parts of the arc-shaped gate slots, and the hydraulic press between the arc-shaped gates and the gate piers is installed and tested. Because the upstream and downstream water-retaining gates can be used to block water during the construction of the second-phase floodgate, the installation and testing of the arc-shaped gates and opening / closing equipment of the first-phase floodgate can be completed, effectively shortening the installation and testing time of the metal structure. Step T3: The first-phase floodgate is used for flood control. A second enclosed area is formed on the other side of the river using the second-phase closed water-retaining structure. Construction of the second-phase floodgate and powerhouse is carried out within this second enclosed area. After completion, the second-phase closed water-retaining structure is dismantled. Since the first-phase floodgate can meet the flood control requirements, the second-phase floodgate and powerhouse can be constructed continuously, thus better achieving the goal of accelerating the construction progress of the dam project and generating electricity ahead of schedule.

[0028] (4) The first phase of the flood discharge gate adopts the method of using the upstream and downstream water-blocking gates to block water in each gate for the installation and commissioning of the arc-shaped working gate and hydraulic press. When the arc-shaped gate and hydraulic press are installed in the flood discharge gate using the upstream and downstream water-blocking gates, the discharge capacity of the other gates meets the requirements for flood control during construction, ensuring the safety of flood control during the construction period.

[0029] (5) During the construction of the first phase of the flood discharge gate, the height of the gate pier is determined according to the requirements of the construction of the gate pier during the flood season and the dry season, and a sufficient number of exposed reinforcing bars are reserved to facilitate the lap splicing of the reinforcing bars, thereby facilitating the pouring of concrete and effectively reducing the difficulty of subsequent construction.

[0030] (6) When the flood discharge gate adopts the surface gate type, the longitudinal earth and rock cofferdam of the construction section of the first-phase flood discharge gate and the second-phase closed water-retaining structure is transformed into a longitudinal guide wall, which facilitates the casting of the gate piers of the second-phase flood discharge gate and can guide the water flow, improve the flood discharge flow pattern, reduce the scouring effect of the water flow on the gate piers, and is conducive to the safety of the flood discharge of the project. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the installation of the metal structure inside the first-phase floodgate in the first closed area according to Embodiment 1 of the present invention;

[0033] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the first-phase flood discharge gate, which is also a schematic diagram of the flood discharge process.

[0034] Figure 3 This is a schematic diagram of the metal structure installation during the cross-construction of the second-phase floodgate and powerhouse in the second enclosed area according to Embodiment 1 of the present invention;

[0035] Figure 4 for Figure 3 The BB section view shows the completed installation of the metal structure of the second-phase flood discharge gate;

[0036] Figure 5 This is a schematic diagram of the metal structure installation during the simultaneous construction of the first-phase flood discharge gate and the powerhouse in Embodiment 1 of the present invention;

[0037] Figure 6 for Figure 5 The CC cross-sectional view shows the first-phase flood discharge gate, which uses an emergency gate, a downstream water-blocking gate, an arc-shaped gate, and a hydraulic press.

[0038] Figure 7 for Figure 5 The DD cross-sectional view is specifically a schematic diagram of the second-phase flood discharge gate opening the arc gate for flood passage;

[0039] Figure 8 This is a schematic diagram showing the completed installation status of the metal structures of the first-phase and second-phase flood discharge gates in Embodiment 1 of the present invention.

[0040] Figure 9 This is a schematic diagram of the installation of the metal structure inside the first-phase floodgate in the first enclosed area in Embodiment 2 of the present invention;

[0041] Figure 10 for Figure 9 The EE cross-sectional view is a schematic diagram of the first-phase flood discharge gate during the flood season.

[0042] Figure 11 This is a schematic diagram of the metal structure installation during the cross-construction of the second-phase floodgate and powerhouse in the second enclosed area according to Embodiment 2 of the present invention.

[0043] Figure 12 for Figure 11 The FF sectional view is a schematic diagram of the completed installation of the metal structure of the second-phase flood discharge gate;

[0044] Figure 13 This is a schematic diagram of the metal structure installation during the simultaneous construction of the first-phase floodgate and the powerhouse in Embodiment 2 of the present invention.

[0045] Figure 14 For is Figure 13 The GG cross-sectional view is specifically a schematic diagram of the first-phase flood discharge gate adopting an emergency gate and the downstream third-phase cofferdam for water retention;

[0046] Figure 15 for Figure 13 The HH cross-sectional view is specifically a schematic diagram of the second-phase flood discharge gate opening the arc gate to allow flood flow during the flood season;

[0047] Figure 16 This is a schematic diagram showing the completed installation status of the metal structures of the first-phase and second-phase flood discharge gates in Embodiment 2 of the present invention;

[0048] Figure 17 for Figure 16 Section II, specifically a schematic diagram of the completed installation of the metal structure of the first-phase flood discharge gate;

[0049] Figure 18 This is a schematic diagram of the completed installation and breached state of the metal structures of the first-phase and second-phase flood discharge gates in Embodiment 2 of the present invention.

[0050] Figure 19 This is a schematic diagram of the installation of the metal structure inside the first-phase floodgate in the first closed area according to Embodiment 3 of the present invention;

[0051] Figure 20 yes Figure 19 The cross-sectional view of JJ, and a schematic diagram of the first-phase flood discharge gate during the flood season;

[0052] Figure 21 This is a schematic diagram of the metal structure installation during the cross-construction of the first and second phase floodgates and powerhouse in Embodiment 3 of the present invention;

[0053] Figure 22 yes Figure 21 The KK sectional view, which is also a schematic diagram of the completed installation of the metal structure of the second-phase flood discharge gate;

[0054] Figure 23 This is a schematic diagram of the metal structure installation during the simultaneous construction of the first-phase floodgate and the powerhouse in Embodiment 3 of the present invention;

[0055] Figure 24 yes Figure 23The LL sectional view is specifically a schematic diagram of the first-phase flood discharge gate, which uses an emergency gate, a downstream water-blocking gate, an arc-shaped gate, and a hydraulic press for water blocking.

[0056] Figure 25 yes Figure 23 The MM cross-sectional view is a schematic diagram of the second-phase flood discharge gate opening the arc gate for flood passage;

[0057] Figure 26 This is a schematic diagram showing the completed installation status of the metal structures of the first-phase and second-phase flood discharge gates in Embodiment 3 of the present invention;

[0058] Figure 27 This is a schematic diagram of the metal structure installation during the independent construction of the first-phase floodgate in the first enclosed area according to Embodiment 4 of the present invention;

[0059] Figure 28 yes Figure 27 The NN cross-sectional view is specifically a schematic diagram of the metal structure installation of the first-phase flood discharge gate within the first-phase enclosed water-retaining structure.

[0060] Figure 29 This is a schematic diagram of the installation of the first-phase floodgate and the metal structure during construction within the second-phase enclosed water-retaining structure, according to Embodiment 4 of the present invention.

[0061] Figure 30 yes Figure 29 The OO sectional view is specifically a schematic diagram of the installation of an arc-shaped gate and a hydraulic press for the first-phase flood discharge gate, which uses an upstream water-blocking gate and a downstream water-blocking gate.

[0062] Figure 31 yes Figure 29 The PP cross-sectional view is specifically a schematic diagram of the flood discharge through the gate opening of the first-phase flood discharge gate without the installation of the arc gate.

[0063] Figure 32 This is a schematic diagram of the metal structure installation during the simultaneous construction of the first and second phase floodgates and powerhouse in Embodiment 4 of the present invention;

[0064] Figure 33 yes Figure 32 The QQ cross-sectional view is a schematic diagram of the flood passage of the gate opening for the installation of the arc gate in the first phase of the flood discharge gate;

[0065] Figure 34 This is a schematic diagram of the dam-breaking state after the installation of the metal structures of the first-phase and second-phase flood discharge gates in Embodiment 4 of the present invention;

[0066] Figure 35 yes Figure 34 The RR cross-sectional view is a schematic diagram of the working state of the arc gate of the first-phase flood discharge gate.

[0067] Attached diagrams and their corresponding numbers: 1. Phase I spillway gate; 2. Riverbank; 3. Diversion channel; 4. Longitudinal earth-rock cofferdam; 5. Upstream Phase I cofferdam; 6. Downstream Phase I cofferdam; 7. Gate pier; 8. Exposed reinforcing bar; 9. Emergency gate slot embedded part; 10. Arc-shaped gate slot embedded part; 11. Downstream water-retaining gate slot embedded part; 12. Upstream Phase II cofferdam; 13. Downstream Phase II cofferdam; 14. Phase II spillway gate; 15. Emergency gate; 16. Arc-shaped gate; 17. Downstream water-retaining gate; 18. Dam crest gantry crane; 19. Downstream gantry crane; 20. Hydraulic press; 21. Powerhouse; 22. Upstream gate of the generating unit; 23. Downstream gate of the generating unit; 24. Gate opening; 25. Phase III cofferdam; 26. Downstream trolley; 27. Upstream water-retaining gate; 28. Upstream water-retaining gate slot embedded part; 29. ​​Longitudinal guide wall. Detailed Implementation

[0068] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0069] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0070] Example 1:

[0071] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The first embodiment of the present invention will be described in further detail below.

[0072] A method for constructing the metal structure of a flood discharge gate to accelerate the construction progress of a dam project includes the following steps:

[0073] Step S1: Use the first phase closed water-retaining structure to enclose the first closed area on one side of the river channel, and carry out the pouring of the gate pier 7 inside the first phase flood discharge gate 1 and the installation of the metal structure embedded parts within the pouring height range of the gate pier 7 within the first closed area.

[0074] Step S2: Use the first-phase floodgate 1 for flood passage, and at the same time use the second-phase closed water-retaining structure to enclose a second closed area on the other side of the river. In the second closed area, carry out the construction of the metal structure of the second-phase floodgate 14, and complete the remaining concrete pouring of the gate pier 7 in the first-phase floodgate 1 and the installation of the internal metal structure embedded parts during the dry season.

[0075] Step S3: After the second-phase floodgate 14 is used to pass through the flood, complete the installation of all the arc gates 16 and their hydraulic presses 20 in the first-phase floodgate 1.

[0076] Specifically, this embodiment is used for dam projects where the tail end of the flood discharge gate is close to the tailrace gate opening of the powerhouse. Its advantage is that the downstream water-retaining gate of the flood discharge gate can share the opening and closing equipment of the tailrace gate of the powerhouse, saving investment. In step S1, before construction, the number of gate openings 24 of the first-phase flood discharge gate 1 that meet the flood discharge flow requirements for flood diversion during the construction period and the height H required for pouring the gate pier 7 during the dry season are first determined. The pouring height of the gate pier 7 meets the requirement of being above the water surface throughout the dry season and a sufficient number of exposed reinforcing bars 8 are reserved to facilitate the subsequent splicing of reinforcing bars, thereby facilitating concrete pouring and effectively reducing the difficulty of subsequent construction.

[0077] A diversion channel 3 is excavated near one of the riverbanks 2 on the river channel. A longitudinal earth-rock cofferdam 4 is set along the side of the diversion channel 3 near the center of the river channel. An upstream first-phase cofferdam 5 and a downstream first-phase cofferdam 6 are set at the upstream and downstream ends of the diversion channel 3, respectively. The riverbank 2 on one side of the river channel, the longitudinal earth-rock cofferdam 4, the upstream first-phase cofferdam 5, and the downstream first-phase cofferdam 6 together constitute the first-phase closed water-retaining structure. The first-phase floodgate 1 is located inside the diversion channel 3. The height of the longitudinal earth-rock cofferdam 4 is sufficient to prevent the floodgate 1 from overflowing during flood season.

[0078] The first phase of the flood discharge gate 1 is being constructed within the first phase closed water-retaining structure. According to the progress of the civil construction, the installation of the closed water-retaining metal structure will be carried out successively. Specifically, the installation of all emergency gate slot embedded parts 9, arc gate slot embedded parts 10, and downstream water-retaining gate slot embedded parts 11 within the pouring height range of the first phase flood discharge gate 1 will be completed.

[0079] In step S2, the upstream first-phase cofferdam 5 and the downstream first-phase cofferdam 6 are destroyed, and the flow is diverted through the diversion channel 3 (i.e., the first-phase floodgate 1 is used for flood control). The upstream first-phase cofferdam 5 and the downstream first-phase cofferdam 6 are destroyed. An upstream second-phase cofferdam 12 and a downstream second-phase cofferdam 13 are respectively constructed at the upstream and downstream ends of the longitudinal earth-rock cofferdam 4. The longitudinal earth-rock cofferdam 4, the upstream second-phase cofferdam 12, the downstream second-phase cofferdam 13, and the riverbank 2 on the other side of the river channel together constitute the second-phase closed water-retaining structure. Metalwork is then constructed according to the progress of the civil engineering work, proceeding through the first-phase floodgate 1 for flood control and during the dry season. The structural installation specifically involves installing the emergency gate slot 9, the arc-shaped gate slot 10, and the downstream water-retaining gate slot 11 inside the gate pier 7; installing the emergency gate 15 inside the emergency gate slot 9, the arc-shaped gate 16 inside the arc-shaped gate slot 10, installing the dam crest gantry crane 18 at the dam crest position, and installing a hydraulic press 20 between the gate pier 7 and the arc-shaped gate 16; installing the downstream water-retaining gate 17 inside the downstream water-retaining gate slot 11, and installing the downstream gantry crane 19 on top of the downstream water-retaining gate 17. The downstream gantry crane 19 is used to operate the downstream water-retaining gate 17. During the dry season, the remaining concrete pouring of the gate pier 7 of the first-phase flood discharge gate 1 and the installation of the emergency gate slot 9, the arc-shaped gate slot 10, and the downstream water-retaining gate slot 11 are completed.

[0080] In step S2, the construction of the plant 21 is also carried out within the second-phase closed water-retaining structure. Upstream gate 22 and downstream gate 23 of the unit are set on the upstream and downstream sides of the plant 21, respectively, to block water and carry out the installation and commissioning of electromechanical equipment in the plant 21.

[0081] In step S3, when the second-phase floodgate 14 is used for flood discharge, the upstream second-phase cofferdam 12 and the downstream second-phase cofferdam 13 are broken to complete the installation of all the arc gates 16 and the corresponding hydraulic presses 20 in the first-phase floodgate 1. The emergency gate 15 is also installed in the emergency gate slot embedded part 9 of the first-phase floodgate 1.

[0082] In this embodiment, each gate 24 in the first-phase flood discharge gate 1 is equipped with an emergency gate 15, which is operated by a dam top gantry crane 18. After the installation of the emergency gate slot embedded part 9 and the emergency gate 15 of the first-phase flood discharge gate 1 is completed, the dynamic water closes all the emergency gates 15 of the first-phase flood discharge gate 1 to block water, and then the static water closes the downstream water-blocking gate 17. The water-blocking gate 17 is operated by a downstream gantry crane 19.

[0083] After the emergency gate 15 and the downstream water-blocking gate 17 block water, the installation and commissioning of the arc gate 16, the arc gate groove embedded part 10 and the hydraulic press 20 are completed.

[0084] After the arc gate 16 and hydraulic press 20 of the first-phase flood discharge gate 1 are installed and debugged, the downstream water-blocking gate 17 is opened by filling the horizontal pressure, and then the emergency gate 15 is opened after filling the horizontal pressure, thus completing the water-blocking working state of the arc gate 16, thereby completing the installation of the metal structure of the entire dam project.

[0085] Example 2:

[0086] The following is in conjunction with the appendix Figure 9 To be continued Figure 18 The second embodiment of the present invention will be described in further detail.

[0087] Specifically, this second embodiment is used for dam projects where the tail of the flood discharge gate is far from the tailrace gate opening of the powerhouse. The downstream water-retaining gate of the flood discharge gate cannot share the opening and closing equipment of the tailrace gate; a separate opening and closing device is required, increasing project investment significantly and resulting in poor technical and economic efficiency. Therefore, this second embodiment does not include the downstream water-retaining gate slot embedded part 11, the downstream water-retaining gate 17, or the downstream gantry crane 19 as in the first embodiment. The rest is the same as in the first embodiment and will not be repeated here.

[0088] In this second embodiment, after the installation of the emergency gate slot embedded part 9 and the emergency gate 15 of the first-phase flood discharge gate 1 is completed, the water flow closes all the emergency gates 15 of the first-phase flood discharge gate 1 to block water, and a third-phase cofferdam 25 is set in the downstream section of the diversion channel 3 to block water.

[0089] After the emergency gate 15 and the third-phase cofferdam 25 impound water, the arc gate 16 and the corresponding hydraulic press 20 are installed and commissioned in the first-phase flood discharge gate 1. After the arc gate 16 and the hydraulic press 20 of the first-phase flood discharge gate 1 are installed and commissioned, the third-phase cofferdam 25 is broken, and then the emergency gate 15 is opened after the water pressure is filled, so that the arc gate 16 can be put into water-impounding working state, thereby completing the installation of the metal structure of the entire gate and dam project.

[0090] Example 3:

[0091] The following is in conjunction with the appendix Figure 19 To be continued Figure 26 The third embodiment of the present invention will be described in further detail.

[0092] Specifically, this third embodiment is used for projects with a relatively short tail of the flood discharge gate pier. Since the installation of the gantry crane requires extending the length of the gate pier, it not only affects the energy dissipation of the outlet water flow but also increases the investment significantly. Therefore, the difference between the third embodiment and the first embodiment is that the downstream water-retaining gate 17 in the third embodiment is operated by the downstream trolley 26, and the downstream gantry crane 19 in the first embodiment is not installed. Without extending the length of the gate pier, the frame set up on the top platform of the flood discharge gate pier is used to arrange the trolley track. The rest is the same as the first embodiment and will not be described again here.

[0093] Example 4:

[0094] The following is in conjunction with the appendix Figure 27 To be continued Figure 35 The fourth embodiment of the present invention will be described in further detail.

[0095] A method for constructing the metal structure of a flood discharge gate to accelerate the construction progress of a dam project includes the following steps:

[0096] Step T1: Using the first-phase closed water-retaining structure, a first closed area is formed on one side of the river channel. First, determine the number of gate openings 24 that meet the flood discharge requirements for construction diversion and flood control. Within this first closed area, pour the gate piers 7 inside the first-phase flood discharge gate 1. Then, install the upstream gate slot embedded part 28, the arc-shaped gate slot embedded part 10, and the downstream gate slot embedded part 11 in sequence along the direction of water flow inside the gate piers 7. Install the upstream gate 27 in the upstream gate slot 28 and the downstream gate 17 in the downstream gate slot embedded part 11. The upstream gate 27 is operated by the dam top gantry crane 18, and the downstream gate 17 is operated by the downstream gantry crane 19.

[0097] Step T2: In the first-phase flood discharge gate 1, water is blocked one by one through the upstream water-blocking gate 27 and the downstream water-blocking gate 17. The arc-shaped gate 16 is installed in the arc-shaped gate groove embedded part 10, and the hydraulic press 20 between the arc-shaped gate 16 and the gate pier 7 is installed and debugged.

[0098] Step T3: Use the first-phase floodgate 1 for flood passage, and use the second-phase closed water-retaining structure to enclose a second closed area on the other side of the river channel. Carry out the construction of the second-phase floodgate 14 and the powerhouse 21 within the second closed area. After the construction is completed, demolish the second-phase closed water-retaining structure.

[0099] In step T1, the first-phase closed water-retaining structure is formed by the longitudinal earth-rock cofferdam 4 set in the river channel, the upstream first-phase cofferdam 5 and the downstream first-phase cofferdam 6 set at the upstream and downstream ends of the earth-rock cofferdam 4, and the riverbank 3 on one side of the river channel.

[0100] In step T3, the second-phase closed water-retaining structure is a closed structure formed by the longitudinal guide wall 29, the upstream second-phase cofferdam 12 and the downstream second-phase cofferdam 13, and the riverbank 2 on the other side of the river channel.

[0101] In this embodiment, the number of gate openings 24 of the first-phase flood discharge gate 1 is determined based on the number required for flood discharge flow during construction and n (n is a natural number ≥ 1).

[0102] In this embodiment, the first-phase flood discharge gate 1 is installed and debugged one gate at a time, using the upstream water-blocking gate 27 and the downstream water-blocking gate 17 to block water. After the installation and debugging of the arc gate 16 and hydraulic press 20 of one flood discharge gate are completed, the upstream water-blocking gate 27 and the downstream water-blocking gate 17 are opened by filling the water level and pressure, and the arc gate 16 is used to open the water discharge. Then, the installation and debugging of the arc gate 16 and hydraulic press 20 of the other flood discharge gate are carried out in the same way.

[0103] After the completion of civil construction and metal structure installation and commissioning of the second-phase flood discharge gate 14 and the powerhouse 21, the upstream second-phase cofferdam 12 and the downstream second-phase cofferdam 13 were demolished.

[0104] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for accelerating the construction of a metal structure of a floodgate, characterized in that, Includes the following steps: Step S1: Before construction, first determine the number of gate openings (24) of the first-phase flood discharge gate (1) that meet the flood discharge flow requirements for the construction diversion and flood control, and the height H of the gate piers (7) to meet the requirements for pouring during the dry season. The pouring height of the gate piers (7) meets the requirement of being exposed above the water surface throughout the dry season and reserves a sufficient number of exposed reinforcing bars (8). Use the first-phase closed water-retaining structure to enclose the first closed area on one side of the river channel. In this first closed area, pour the gate piers (7) inside the first-phase flood discharge gate (1) and complete the installation of the metal structure embedded parts within the pouring height range of the gate piers (7). The embedded parts within the pouring height range of the gate piers (7) include the emergency gate slot embedded parts (9) and the arc gate slot embedded parts (10), as well as the downstream water-retaining gate slot embedded parts (11). Complete the installation of all the emergency gate slot embedded parts (9), arc gate slot embedded parts (10), and downstream water-retaining gate slot embedded parts (11) within the pouring height range of the first-phase flood discharge gate (1). Step S2: Use the first-phase floodgate (1) to pass through the flood season, and at the same time use the second-phase closed water-blocking structure to form a second closed area on the other side of the river channel. In the second closed area, carry out the construction of the metal structure of the second-phase floodgate (14), and complete the remaining concrete pouring of the gate pier (7) of the first-phase floodgate (1) and the installation of the internal metal structure embedded parts during the dry season. Step S3: After the flood season is overrun by the second-phase floodgate (14), the installation of all the arc gates (16) and their opening and closing equipment in the first-phase floodgate (1) is completed; the emergency gate (15) is installed in the emergency gate slot (9) of the first-phase floodgate (1), and the downstream water-retaining gate (17) is installed in the downstream water-retaining gate slot (11) of the first-phase floodgate (1); then the emergency gates (15) of the first-phase floodgate (1) are closed by flowing water, and the downstream water-retaining gate (17) is closed by still water; after the emergency gates (15) and the downstream water-retaining gate (17) are closed by the emergency gates (15) and the downstream water-retaining gate (17), the installation and commissioning of the arc gates (16), the arc gate slot (10) and the hydraulic press (20) are completed.

2. The method for accelerating the construction of a sluice metal structure of a flood sluice dam project according to claim 1, characterized in that: In step S1, a diversion channel (3) is excavated at a location near one of the riverbanks (2) on the river channel. A longitudinal earth-rock cofferdam (4) is set along the diversion channel (3) near the center of the river channel. An upstream first-phase cofferdam (5) and a downstream first-phase cofferdam (6) are set at the upstream and downstream ends of the diversion channel (3), respectively. One of the riverbanks (2), the longitudinal earth-rock cofferdam (4), the upstream first-phase cofferdam (5), and the downstream first-phase cofferdam (6) together constitute the first-phase closed water-blocking structure. The first-phase floodgate (1) is located inside the diversion channel (3). The height of the longitudinal earth-rock cofferdam (4) is sufficient to prevent the floodgate (1) from overflowing during flood season.

3. The method for accelerating the construction of a sluice metal structure of a flood sluice dam project according to claim 2, characterized in that: In step S2, when the first-stage floodgate (1) is used for flood passage, the upstream first-stage cofferdam (5) and the downstream first-stage cofferdam (6) are destroyed; the upstream second-stage cofferdam (12) and the downstream second-stage cofferdam (13) are set at the upstream and downstream ends of the longitudinal earth-rock cofferdam (4), respectively; the longitudinal earth-rock cofferdam (4), the upstream second-stage cofferdam (12), the downstream second-stage cofferdam (13) and the riverbank (2) on the other side of the river channel together constitute the second-stage closed water-blocking structure; in step S3, when the second-stage floodgate (14) is used for flood passage, the upstream second-stage cofferdam (12) and the downstream second-stage cofferdam (13) are destroyed.

4. The method for accelerating the construction of a sluice metal structure of a sluice dam project according to claim 2, characterized in that: Three-stage cofferdams (25) are set up in the downstream section of the diversion channel (3).

5. The method for accelerating the construction of a sluice metal structure of a flood sluice dam project according to claim 1, characterized in that: In step S2, during the construction of the metal structure of the second-phase flood discharge gate (14), the metal structure includes the emergency gate slot embedded part (9) inside the gate pier (7) of the second-phase flood discharge gate (14), the arc gate slot embedded part (10), the emergency gate (15) set in the emergency gate slot embedded part (9), the arc gate (16) set in the arc gate slot embedded part (10), the dam top gantry crane (18) installed at the dam top position, and the hydraulic press (20) installed between the gate pier (7) and the arc gate (16).

6. The method for accelerating the construction of a sluice metal structure of a flood sluice dam project according to claim 1, characterized in that: In step S2, during the construction of the metal structure of the second-phase flood discharge gate (14), the metal structure also includes the downstream water-retaining gate slot embedded part (11) inside the gate pier (7) of the second-phase flood discharge gate (14), the downstream water-retaining gate (17) set in the downstream water-retaining gate slot embedded part (11), and the downstream gantry crane (19) or downstream trolley (26) installed on the top of the downstream water-retaining gate (17). The downstream gantry crane (19) or downstream trolley (26) is used to operate the downstream water-retaining gate (17).

7. The method for accelerating the construction of a sluice metal structure of a flood sluice dam project according to claim 1, characterized in that: In step S2, the construction of the plant (21) is carried out in the second phase closed water-blocking structure, and upstream gate (22) and downstream gate (23) of the unit are set on the upstream and downstream sides of the plant (21) respectively to block water for the installation and commissioning of electromechanical equipment in the plant (21).

8. A method for constructing a metal structure of a floodgate to accelerate the construction progress of a gate dam project, characterized in that, Includes the following steps: Step T1: Use the first phase closed water-retaining structure to enclose the first closed area on one side of the river channel. In the first closed area, pour the gate pier (7) inside the first phase flood discharge gate (1). In the gate pier (7), install the upstream water-retaining gate slot embedded part (28), the arc-shaped gate slot embedded part (10), and the downstream water-retaining gate slot embedded part (11) in sequence along the direction of water flow. Install the upstream water-retaining gate (27) in the upstream water-retaining gate slot embedded part (28) and the downstream water-retaining gate (17) in the downstream water-retaining gate slot embedded part (11). The upstream water-retaining gate (27) is operated by the dam top gantry crane (18), and the downstream water-retaining gate (17) is operated by the downstream gantry crane (19). Step T2: In the first-phase flood discharge gate (1), water is blocked by the upstream water-blocking gate (27) and the downstream water-blocking gate (17) one by one. The arc gate (16) is installed in the arc gate groove embedded part (10), and the hydraulic press (20) between the arc gate (16) and the gate pier (7) is installed and debugged. Step T3: Use the first-phase floodgate (1) to pass through the flood season, and use the second-phase closed water-retaining structure to enclose the second closed area on the other side of the river channel. In the second closed area, carry out the construction of the second-phase floodgate (14) and the powerhouse (21). After the construction is completed, break the second-phase closed water-retaining structure.

9. The method of claim 8, wherein the method further comprises: In step T1, the first-phase closed water-retaining structure is formed by the longitudinal earth-rock cofferdam (4) set in the river channel, the upstream first-phase cofferdam (5) and the downstream first-phase cofferdam (6) set at the upstream and downstream ends of the longitudinal earth-rock cofferdam (4), and the riverbank (2) on one side of the river channel.

10. The method for accelerating the construction of a sluice metal structure of a sluice dam project according to claim 9, characterized in that: In step T3, the second-phase closed water-retaining structure is a closed structure formed by the longitudinal guide wall (29), the upstream second-phase cofferdam (12) and the downstream second-phase cofferdam (13), and the riverbank (2) on the other side of the river channel.

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