Construction method of vertical joint type fishway with multi-layered folded partition plate of bent frame

Abstract

The application discloses a construction method of a fishway with a vertical joint type of a multi-layer plate folding partition, and comprises frame construction and fishway construction, S10, first layer column steel bar installation and first layer column formwork installation are carried out; S20, first layer frame beam support frame erection is carried out, and first layer frame beam bottom formwork installation is carried out, then first layer frame beam steel bar installation and first layer frame beam side formwork installation are carried out; S30, first layer frame cross beam embedded part installation is carried out, and first layer column and beam concrete pouring is carried out; S40, S10-S30 are repeated until frame construction is completed; the fishway construction comprises the following steps, S50, first layer fishway groove bearing support erection is carried out; S60, first layer fishway groove bottom formwork installation, first layer fishway groove steel bar installation and first layer fishway groove side formwork installation are carried out; S70, first layer fishway groove concrete pouring is carried out; S80, S50-S70 are repeated until fishway groove construction is completed; S90, prefabricated partition plates are made and installed. The application effectively solves the problems of complex structure and great construction difficulty, and ensures the construction period.

Description

Technical Field

[0001] This invention relates to the field of water conservancy infrastructure construction, and in particular to a method for constructing a multi-layered, folded, vertically slit fishway. Background Technology

[0002] Fishways are artificial passages used by fish to migrate upstream through structures such as sluices and dams or natural obstacles. Most existing fishways are built using natural terrain. However, methods that reduce the longitudinal slope of fishways and adopt a frame structure are still relatively rare. The Bachu River Project is a prime example. This fishway utilizes the natural channel of the Bachu River, a tributary of the Jinsha River, and employs a technically advanced fishway design, making it a pioneering achievement both domestically and internationally.

[0003] While fishways are typically constructed using multi-layered, coiled reinforced concrete frames, the resulting arrangement is complex and difficult to build. Due to the required slope, multiple rows of fishways are arranged on the frame, with deflections and folds at the ends. The number of coils varies depending on the total water head, with crossbeams serving as fishway supports. Connecting beams are arranged longitudinally along the frame, resulting in frequent changes in the height of both longitudinal and transverse beams. The height of individual columns is not fixed, and the height of the fishway's load-bearing supports varies considerably. Therefore, a comprehensive construction technology for multi-layered, coiled, diaphragm-type fishways with vertical joints is currently lacking. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for a multi-layered, folded partition, vertically slotted fishway that can effectively reduce construction costs and ensure construction period.

[0005] The technical solution adopted by the present invention to solve its technical problem is: the construction method of the multi-layer plate folding partition vertical joint fishway, including frame construction and fishway construction;

[0006] The scaffolding construction includes the following steps:

[0007] S10. Install the first-layer column reinforcement and the first-layer column formwork.

[0008] S20. Erect the support frame for the first-layer frame beam and install the bottom formwork for the first-layer frame beam. Then install the reinforcement bars and side formwork for the first-layer frame beam.

[0009] S30. Install the embedded parts of the first-layer frame beams and pour concrete for the first-layer columns and beams;

[0010] S40. Repeat steps S10-S30 until the scaffolding construction is completed;

[0011] Fishway construction includes the following steps:

[0012] S50. Construct the first layer of fishway support structure.

[0013] S60. Install the bottom formwork of the first layer of fish passage channel, the steel reinforcement of the first layer of fish passage channel, and the side formwork of the first layer of fish passage channel.

[0014] S70, First layer of fish passageway concrete pouring;

[0015] S80. Repeat steps S50-S70 until the fish passage channel construction is completed.

[0016] S90. Fabricate and install prefabricated partitions.

[0017] Furthermore, step S10 includes the installation of the first layer of column reinforcement bars,

[0018] S101. Erect supporting scaffolding, using the same steel pipes as the beam support frame in step S20, and the longitudinal and transverse spacing with the beam support frame should be equal or multiples of each other. Lay planks around the working surface and hang safety nets.

[0019] S102. Tie the stirrups according to the design requirements for the spacing and quantity. First, stagger the hooks of the stirrups and put them on the pre-embedded steel bars of the lower foundation. Then, erect the column steel bars. The lap length and tying should be in accordance with the preset requirements, with the tying facing inward.

[0020] S103. Set column positioning bars. The main bars of the vertical load-bearing column are connected by straight threads. The connection joints, sleeve dimensions and the thickness of the steel reinforcement protective layer meet the preset requirements.

[0021] Among them, the stirrup joints are staggered on the vertical reinforcement, the stirrups are perpendicular to the main reinforcement, and the stirrups are tied to the main reinforcement and the stirrup joints. The top surface of the lower layer of exposed vertical reinforcement at the intersection with the beam is fixed with column hoops.

[0022] The location of the rebar splices should avoid the stirrup-reinforced zone and be set in the area of ​​least stress. Adjacent rebar splices should be staggered by 35d and not less than 50cm. After the protective layer thickness reaches the threshold, spacers should be added with a spacing of 100cm.

[0023] In areas where tying is difficult, the stirrups are made into spliced ​​types. After they are tied in place, they are welded into closed stirrups with a 10d overlap.

[0024] Furthermore, step S10 includes installing the first-layer column formwork,

[0025] S111. The column formwork is fixed with high-strength bolts. The standard column section uses double-section prefabricated formwork, the intersection with the one-way beam uses triple-section prefabricated formwork, and the intersection with the two-way beam uses quadruple-section prefabricated formwork.

[0026] S112. Before sealing the column formwork, conduct inspection and cleaning, leave space for the beam opening, or pour concrete only to the bottom of the beam, and fix the formwork around the perimeter with steel pipes and frames.

[0027] Furthermore, step S20 includes erecting the support frame for the first-layer frame beam and installing the bottom formwork for the first-layer frame beam.

[0028] S201. The beam support frame is erected using steel pipes. Multiple rows of columns are set horizontally at preset intervals at the bottom of the beam. The column spacing and step distance in the span direction are set according to preset requirements. Bottom supports and wide wooden pads are set at the bottom. Double steel pipes are set on the top of each row of columns in the longitudinal direction as the main beam supporting the bottom formwork of the beam. Square timbers are set at intervals in the transverse direction as small beams at the bottom of the beam. When the beam span is greater than 4m, the arch is raised at 1 / 1000 to 3 / 1000 of the total span length.

[0029] S202. The bottom formwork of the beam is made of plywood. After the support frame is erected, the bottom formwork is laid. Before laying the formwork, the double steel pipe support beam and square timber beam are neatly laid according to the preset spacing requirements. Then the bottom formwork is laid. When laying, it should be connected with the column head or adjacent structure and nailed firmly. Wooden strips are used as supports and uprights.

[0030] Furthermore, step S20 includes the installation of the first-layer frame beam reinforcement,

[0031] S211. Binding steel bars in the preset sequence includes longitudinal steel bars through beams, installing beam stirrups, binding steel bars and padding protective layer;

[0032] The binding process must meet the following requirements: the stirrups must be perpendicular to the main bars, the stirrup hooks must be staggered, and all intersections of the stirrup corners and the longitudinal bars must be securely tied.

[0033] Tension reinforcement splices in beams should be avoided at the location of maximum bending moment. The splice locations should be staggered from each other within a 30d section of the stressed reinforcement and not less than 500mm apart. The percentage of the cross-sectional area of ​​stressed reinforcement with lap splices to the total cross-sectional area of ​​stressed reinforcement should not exceed 25% in the tension zone and not exceed 50% in the compression zone.

[0034] The installation of the side formwork for the first-floor frame beams includes,

[0035] S211. The side formwork is made of plywood, the longitudinal walers of the formwork are made of square timber, and the transverse walers are made of double steel pipes.

[0036] S212. The template surface should be kept flat and evenly coated with release agent. The joints should be tightly assembled. The elevation position of the template surface should be measured, positioned, and marked.

[0037] S213. The beam formwork is laid from both ends of the beam toward the middle, the embedded wood is arranged in the middle of the beam, and the cleaning opening of the beam is set at the end of the beam;

[0038] S214. The formwork is fixed by external fixing and internal tie rods. The external fixing is achieved by connecting the vertical steel pipe of the formwork to the bottom horizontal bar of the bottom formwork and fixing it with fasteners. The tie rods are set with tie rods, one on each side of the beam, with a preset longitudinal spacing. The tie rods are threaded through PVC pipes. In addition, when setting up the formwork, the side formwork should wrap around the bottom formwork. At the connection between the beam formwork and the column formwork, the blanking size should be slightly shortened.

[0039] Furthermore, step S30 includes the installation of the embedded parts for the first-layer frame beams.

[0040] S301. The top surface of the crossbeam of the frame is fully covered with steel plates and anchor bars are welded. The plates are hoisted to the top surface of the beam, and the slope and elevation of the top surface are measured and controlled within the preset range. Spot welds are made on the main reinforcement of the beam. Concrete inlets are opened at the top of the steel plates at intervals of 1.0~1.5m. The inlets are welded back after the concrete is poured.

[0041] The concrete pouring for the first-floor columns and beams includes,

[0042] S301. The scaffolding is constructed using pumped concrete, transported by concrete mixer trucks, and pumped into the formwork by truck-mounted pumps. The column concrete is poured first, and then the construction proceeds from the already poured column end to the other end.

[0043] S302. Before pouring the column, a layer of cement mortar of the same grade with a thickness of 2 to 3 cm should be laid first.

[0044] S303. Concrete is centrally mixed at the concrete mixing plant, and the slump of the concrete is controlled between 18±2cm, and the initial setting time of the concrete is controlled within 8 hours.

[0045] S304. Concrete placement: For frame columns, install the tremie pipe to 80-100cm above the pouring surface; for beams, use a truck pump hose to directly place the concrete. The layer thickness should be controlled at 30-40cm. Use a flexible shaft immersion vibrator for compaction. The vibration depth of the vibrator should generally not exceed 2 / 3 to 3 / 4 of the rod length. When vibrating, insert the vibrator quickly and pull it out slowly, and move the vibrator up and down continuously to ensure uniform compaction.

[0046] When pouring in layers, the vibrator should be inserted 10cm into the lower layer of concrete. The moving distance should not be greater than 1.5 times the effective radius of the vibrator. It should be kept at least 5cm away from the side formwork. For each vibration point, the vibration duration should be 20-30s, until the concrete no longer settles, no air bubbles appear, and the surface shows a layer of slurry.

[0047] The pouring is carried out continuously, and the upper layer of concrete must be poured and compacted before the lower layer of concrete has initially set.

[0048] S305. Drain water from the pouring chamber during the pouring process to avoid opening holes in the formwork to drive away water and mortar. Remove mortar adhering to the formwork and reinforcing steel surface at any time. Control the flatness of the concrete surface within the preset range to ensure appearance quality.

[0049] S306. Finish the exposed surface of the beam. When finishing, use a scraper to smooth it, then use a wooden trowel to remove the grout, and then use an iron trowel to smooth and polish it, ensuring that the flatness of the concrete surface meets the requirements.

[0050] S307. Curing: After the concrete is poured at room temperature, the exposed surface is wrapped with plastic film and then covered with felt. The covering should avoid direct contact with the concrete surface until the concrete has initially set.

[0051] Sprinkling is carried out using a flower pipe to ensure sufficient condensate water inside the membrane, and the curing time shall not be less than 28 days.

[0052] S308. When dismantling or erecting formwork, reliable footings should be provided for work at heights of 2 meters or more, and appropriate safety protection structures should be in place.

[0053] The formwork removal sequence should follow the principle of removing the formwork after the support is erected, removing the formwork after the support is erected, and removing it from top to bottom. The side formwork of beams and columns can be removed after the concrete strength is sufficient to ensure that the surface and edges of the components will not be damaged by the removal of the formwork. Beams need to bear the construction load of the layer beams and can only be removed after the strength reaches the design strength.

[0054] After demolding, the outer surfaces of the columns and beams of the scaffolding are covered with a thin film for protection, and watering or heat preservation is carried out according to the season.

[0055] Furthermore, the erection of the first-layer fishway support in step S50 includes,

[0056] S501, the fish passage is coiled between the columns of the frame, with a rest room in the middle for connection. Each span can be constructed separately from bottom to top. The upper aqueduct support is erected on the lower aqueduct that has been constructed. Each aqueduct layer can be constructed in sections according to the structure. The aqueduct bottom slab and side walls are cast in one piece.

[0057] S502. The support frame is erected using steel pipes. Multiple rows of columns with a preset spacing are set horizontally at the bottom of the fish passage. The column spacing and step distance in the span direction are in accordance with the preset standard. The bottom is set with a base support and a wide wooden pad. The height of the support frame is adjusted by setting a top support.

[0058] Multiple square timbers are evenly arranged on the top of the longitudinal columns at the bottom of the fish passage as small beams at the bottom of the beam, and a single steel pipe is arranged horizontally as the main beam supporting the bottom formwork of the beam. The spacing is the same as the longitudinal spacing of the columns and reaches the preset value.

[0059] S503. Once the concrete reaches 70% of its design strength, it can meet the upper load-bearing requirements. The lower support frame can be removed after it meets the demolding strength required by the specifications and is no less than 70%.

[0060] Furthermore, the installation of the first layer of the fishway channel bottom mold in step S60 includes,

[0061] S601. The fish passage channel is made of plywood. After the support frame is erected, the bottom formwork is laid. Before laying the formwork, the double steel pipe support main beam and square timber beam are neatly laid according to the preset spacing requirements. Then the bottom formwork is laid. When laying, it should be connected with the column head or adjacent structure and nailed firmly. Wooden strips are used as uprights and upright supports.

[0062] The installation of the first layer of fishway reinforcement includes...

[0063] S611. Concrete spacers supporting the reinforcing bars shall be installed between the reinforcing bars and the formwork. The strength of the spacers shall not be lower than that of the concrete in the same location. The spacers shall be tied to the reinforcing bars with steel wires embedded in them. The spacers shall be staggered and distributed. Short steel bars shall be used for support between two rows of reinforcing bars.

[0064] S612. Reinforcing bars shall be welded. The weld length of a single-sided weld shall not be less than 10d, and the weld length of a double-sided weld shall not be less than 5d. The weld height shall be equal to or greater than 0.3d and not less than 4mm. The weld width shall be equal to or greater than 0.7d and not less than 8mm, where d is the diameter of the main reinforcing bar.

[0065] The installation of the first layer of fishway channel side mold includes...

[0066] S621. The template is made of plywood. The template is fixed around the perimeter and the walers are made of square timber. Except for the top and bottom square timbers, the other walers are set vertically with a preset spacing.

[0067] S622. The formwork is fixed by external top support and internal bracing, and side wall tie-down.

[0068] External roof: When there are beams on both sides of the fish passage channel, the beams are used to support the roof with square timber and formwork. When there are no beams, steel pipes, top supports and outer frame are used to support the roof. One is set at the top and one at the bottom, with the longitudinal spacing set at the preset value and arranged in a quincunx pattern. The first set is set below the top of the side wall and the second set is set below the first set.

[0069] Internal bracing: Steel pipes and top supports are used to support the inner side formwork between the two walls. The height and position of the internal bracing are the same as the outer top; a double longitudinal steel pipe is installed at each support point.

[0070] Tie rods: Tie rods are used for the inner and outer formwork of each wall, with two sets, one at the top and one at the bottom, in the same positions as the outer top and inner tie rods, and the spacing is the preset value;

[0071] S623. The corbel formwork is made of plywood. The bottom sloping formwork is fixed to the lower vertical formwork with square timber walers. Square timber is set around the vertical formwork. The vertical corbel formwork is fixed to the other side wall formwork with tie bolts. The bottom is supported by square timber. The corbel formwork on both sides is supported by square timber internal bracing.

[0072] Double-sided tape should be applied to all seams, applied straight and 1-2mm away from the inside of the panel, ensuring that the double-sided tape is flush with the inside of the panel after being squeezed, and avoiding any breaks in the double-sided tape.

[0073] Furthermore, the first layer of fishway channel concrete pouring in step S70 includes,

[0074] S701. Concrete pouring shall be carried out in an intermittent, inclined layer manner from the low end to the high end, and compacted with an immersion flexible shaft vibrator.

[0075] When pouring concrete, first pour the base slab concrete, spreading it for 2-3m. Then pour the corresponding side walls in layers. Control the thickness of the side walls within the preset range and leave a thickness allowance. After the two side walls have been poured and before the base slab concrete has initially set, pour the base slab concrete again.

[0076] The free fall height of the concrete shall not exceed 1m.

[0077] Furthermore, the fabrication and installation of prefabricated partitions in step S90 includes,

[0078] S901. The partition is prefabricated in situ. The prefabrication is carried out using customized plastic molds. The steel bars are processed and tied in the steel yard and transported to the prefabrication site by vehicle. The concrete is pumped into the formwork using an HBT40 trailer pump and vibrated with a flexible shaft vibrator. Lifting holes are set on the top of the partition during prefabrication.

[0079] S902. The partition is assembled and is fixed to the base plate and side wall using angle iron and expansion bolts. The spacing between the base plates is 25cm and the spacing between the side walls is 50cm.

[0080] Install the components piece by piece from high to low. During hoisting, first use a ruler to position and mark the location according to the design requirements, then lift and place them. Use a straightedge to calibrate the placement. After calibration, perform preliminary fixing immediately, then move the crane to the next installation point. At the same time, arrange personnel to carry out the final fixing of the pre-fixed partitions.

[0081] This multi-layered, folded partition, vertical-slot fishway construction method, compared to existing construction methods, addresses issues such as construction sequence and arrangement, formwork planning and design, zoning and layering, support frame design, and construction methods. It eliminates problems arising from multiple rows of fishway sections arranged on the frame due to slope requirements, folding at the ends of the frame, multi-layered folding based on the total water head, crossbeams serving as fishway supports, longitudinally arranged connecting beams, and frequent changes in the height of longitudinal and transverse beams. It also avoids the problems of inconsistent single-layer column heights and large variations in the height of the fishway load-bearing supports. This invention solves the problems of complex structure and high construction difficulty associated with multi-layered, folded partition, vertical-slot fishway construction, ensuring a timely construction period. Attached Figure Description

[0082] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0083] Figure 1 This is a flowchart of the construction method of the vertical slotted fishway with multi-layered folded partition in the form of a frame, according to an embodiment of the present invention;

[0084] Figure 2 This is a cross-sectional view of the fish passage template support frame according to an embodiment of the present invention;

[0085] Figure 3 This is an axial cross-sectional view of the aqueduct according to an embodiment of the present invention;

[0086] Figure 4 This is a cross-sectional view of the aqueduct according to an embodiment of the present invention;

[0087] Figure 5 This is a typical cross-sectional view of the fish passage channel in an embodiment of the present invention. Detailed Implementation

[0088] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0089] like Figure 1 and Figure 2 As shown, the construction method of the multi-layer folded partition vertical joint fishway includes frame construction and fishway construction.

[0090] The scaffolding construction includes the following steps:

[0091] S10. Install the first-layer column reinforcement and the first-layer column formwork.

[0092] S20. Erect the support frame for the first-layer frame beam and install the bottom formwork for the first-layer frame beam. Then install the reinforcement bars and side formwork for the first-layer frame beam.

[0093] S30. Install the embedded parts of the first-layer frame beams and pour concrete for the first-layer columns and beams;

[0094] S40. Repeat steps S10-S30 until the scaffolding construction is completed;

[0095] Fishway construction includes the following steps:

[0096] S50. Construct the first layer of fishway support structure.

[0097] S60. Install the bottom formwork of the first layer of fish passage channel, the steel reinforcement of the first layer of fish passage channel, and the side formwork of the first layer of fish passage channel.

[0098] S70, First layer of fish passageway concrete pouring;

[0099] S80. Repeat steps S50-S70 until the fish passage channel construction is completed.

[0100] S90. Fabricate and install prefabricated partitions.

[0101] This multi-layered, folded partition, vertical-slot fishway construction method, compared to existing construction methods, addresses issues such as construction sequence and arrangement, formwork planning and design, zoning and layering, support frame design, and construction methods. It eliminates problems arising from multiple rows of fishway sections on the frame due to slope requirements, folding at the ends of the frame, multi-layered folding based on total head, crossbeams serving as fishway supports, longitudinally arranged connecting beams, and frequent changes in the height of longitudinal and transverse beams. It also avoids the problems of inconsistent single-layer column heights and large variations in the height of the fishway load-bearing supports. This invention solves the problems of complex structure and high construction difficulty associated with multi-layered, folded partition, vertical-slot fishway construction, ensuring a timely construction period.

[0102] Regarding scaffolding construction.

[0103] (1) Construction preparation

[0104] Before the scaffolding construction begins, the foundation construction must be completed and pass inspection. The axis positions of each scaffolding column must be measured and verified, the embedded steel bars in the foundation must be arranged, and the top surface of the foundation must be cleaned.

[0105] (2) Installation of reinforcement bars for the first layer of columns

[0106] 1) For column reinforcement construction, first erect supporting scaffolding, using steel pipes of the same beam support frame. The longitudinal and transverse spacing between the scaffolding and the beam support frame should be equal or multiples of each other. Lay planks around the working surface and hang safety nets.

[0107] 2) When binding, according to the design requirements for the spacing and number of stirrups, first put the stirrups on the pre-embedded steel bars of the foundation (lower layer) with staggered hooks, and then erect the column steel bars. Tie them to the pre-embedded steel bars within the lap length, with no less than 3 ties, and the ties should face inward to facilitate the upward movement of the stirrups.

[0108] 3) Column positioning bars should be installed during installation. The main bars of the vertical load-bearing column should be connected with straight threads. The connection joints, sleeve dimensions, and concrete cover thickness should meet the design and specification requirements.

[0109] 4) The stirrups are staggered on the vertical reinforcement bars. The stirrups must be perpendicular to the main reinforcement bars, and the stirrups and the main reinforcement bars, as well as the stirrup joints, must be tied together. The top surface of the lower layer of exposed vertical reinforcement bars at the junction with the beam is fixed with column hoops.

[0110] 5) The location of the rebar joint should avoid the stirrup reinforcement zone and be set in the area with the least stress. Adjacent rebar joints should be staggered by 35d and not less than 50cm. When binding, pay attention to the thickness of the protective layer, and add spacers in time with a spacing of 100cm to ensure the quality of the casting.

[0111] 6) The reinforcement bars at the column and beam joints are very dense, and the core stirrups must not be omitted. In areas where tying is difficult, the stirrups are made into spliced ​​types. After they are tied in place, they are welded into closed stirrups with a 10d lap.

[0112] (3) Installation of first-floor column formwork

[0113] 1) The column formwork uses custom-made circular steel formwork, connected and fixed with φ20 high-strength bolts. Based on the beam position and size, the standard column section uses double-section prefabricated formwork, the junction with one-way beams uses triple-section prefabricated formwork, and the junction with two-way beams uses quadruple-section prefabricated formwork.

[0114] 2) The column formwork can only be installed after the reinforcing steel has been inspected and accepted. Before sealing the formwork, all debris inside the formwork must be cleaned. During construction, space must be left for the beam opening (or the concrete should only be poured up to below the bottom of the beam). The formwork should be fixed to the frame with steel pipes around its perimeter to ensure overall stability.

[0115] (4) Erection of the first-floor frame beam support frame

[0116] 1) The beam support frame is constructed using Ф48mm steel pipes. Four rows of columns are installed horizontally at the bottom of the beam, spaced 600mm apart. The column spacing along the span is also 600mm, with a step distance of 1000mm. A base support and a 20cm wide wooden pad are installed at the bottom. The height of the support frame is adjusted by installing a top support. Each row of columns in the longitudinal direction has double-layered Ф48×3.2mm steel pipes installed above the top support as the main beam supporting the bottom formwork. 60×80mm square timbers spaced 200mm apart are installed horizontally as small beams at the bottom of the beam. When the beam span is greater than 4m, an arch is formed at 1 / 1000 to 3 / 1000 of the total span length.

[0117] (5) Installation of the bottom formwork for the first-floor frame beam

[0118] 1) The bottom formwork of the beam is made of 1.5cm thick plywood. The bottom formwork is laid after the support frame is erected and inspected. Before laying the formwork, double-layered Ф48mm steel pipes are neatly laid to support the main beams and 60mm×80mm×2000mm square timber beams according to the design spacing requirements. Then the bottom formwork is laid. When laying, it should be connected and nailed to the column head or adjacent structure first, and 60mm×80mm timber strips are used as supports.

[0119] (6) Installation of reinforcement bars for the first-floor frame beams

[0120] 1) Binding sequence: Determine the binding sequence → thread longitudinal reinforcement through beam → install beam stirrups → bind reinforcement → place protective layer → inspect reinforcement.

[0121] 2) The stirrups should be perpendicular to the main reinforcement bars, and the stirrup hooks should be staggered. The intersections of the stirrup corners and the longitudinal reinforcement bars should be securely tied.

[0122] 3) Tension reinforcement splices in beams shall not be located at the point of maximum bending moment. The splice locations shall be staggered within the 30d section of the stressed reinforcement (and not less than 500mm). The percentage of the cross-sectional area of ​​stressed reinforcement with lap splices to the total cross-sectional area of ​​stressed reinforcement shall not exceed 25% in the tension zone and not exceed 50% in the compression zone.

[0123] (7) Installation of side formwork for the first-floor frame beam

[0124] 1) The side formwork is made of 1.5cm thick veneer plywood. The longitudinal walers of the formwork are made of 50mm×100mm square timber with a spacing of 25cm. The transverse walers are made of double steel pipes with a spacing of 50cm.

[0125] 2) The template surface should be kept flat and clean, and a release agent should be applied evenly. All joints should be tightly sealed. To ensure the pouring elevation, the elevation position of the template surface should be measured, positioned, and marked.

[0126] 3) The beam formwork is laid from both ends of the beam toward the middle, the embedded wood is placed in the middle of the beam, and the cleaning opening of the beam is set at the end of the beam.

[0127] 4) The formwork is fixed by external fixing and internal tie rods. The external fixing is achieved by connecting the vertical steel pipe enclosure of the formwork to the bottom horizontal bar of the bottom formwork and fixing it with fasteners. The tie rods are Φ16 tie rods, with one set at the top and bottom of the beam, with a longitudinal spacing of 50cm. The tie rods are threaded through Φ18 PVC pipes.

[0128] 5) To prevent quality problems such as uneven beam body, uneven beam bottom and sag, and bulging of beam side formwork during beam formwork installation, the side formwork should be wrapped around the bottom formwork during formwork erection, and the material dimensions at the connection between beam formwork and column formwork should be slightly shortened.

[0129] (8) Installation of embedded parts for the first-layer frame beams

[0130] The crossbeams of the frame serve as fishway supports, with the top surface fully covered by steel plates. Anchor bars are welded in the processing plant according to the design drawings. The top surface of the finger beams is lifted by a tower crane, and its slope and elevation are strictly controlled by measurement. The anchor bars are then spot-welded to the main reinforcement of the beams. A 20×20cm concrete inlet is cut into the top of the steel plate, spaced 1.0~1.5m apart. The inlet is welded back after the concrete pouring is completed.

[0131] (9) First floor column and beam concrete pouring

[0132] 1) After the reinforcement and formwork installation of the scaffolding have been inspected and approved by the supervisor, concrete pouring will proceed. Concrete pouring for the scaffolding will be carried out by pumping, with 8m³ concrete mixer trucks used for transportation. The concrete will be pumped into the formwork first, and then the concrete will be poured from the already poured column end to the other end.

[0133] 2) Before pouring the column, a layer of cement mortar with the same design grade and thickness of 2-3cm should be laid first to ensure good bonding between the new and old concrete surfaces.

[0134] 3) Concrete is centrally mixed at the concrete mixing plant, with the slump controlled between 18±2cm and the initial setting time controlled within 8 hours.

[0135] 4) Concrete Placement: For column frames, install tremie pipes 80-100cm above the pouring surface to prevent concrete segregation and aggregate separation; for beams, use a truck-mounted concrete pump hose for placement. Layer thickness should be controlled at 30-40cm; use a φ50 flexible shaft immersion vibrator for compaction. The vibration depth should generally not exceed 2 / 3 to 3 / 4 of the vibrator length. During vibration, insert the vibrator quickly and withdraw it slowly, continuously moving it up and down to ensure uniform compaction and reduce air bubbles on the concrete surface. When pouring in layers, insert the vibrator 10cm into the lower layer of concrete, with a movement distance not exceeding 1.5 times the vibrator's radius of action, maintaining a distance of at least 5cm from the side formwork. For each vibration point, the vibration duration should be 20-30 seconds, until the concrete no longer settles, no air bubbles appear, and a layer of slurry forms on the surface. Pouring should be continuous, with the upper layer of concrete poured and compacted before the lower layer initially sets.

[0136] 6) During pouring, the vibrator must not directly collide with the formwork, reinforcing bars, or embedded parts. Special care should be taken to vibrate around the embedded parts to ensure a dense pour. Water seeping into the formwork during pouring must be removed promptly. It is strictly forbidden to drill holes in the formwork to expel water and carry away mortar. Mortar adhering to the formwork and reinforcing bar surfaces should be removed immediately. The flatness of the concrete surface must be strictly controlled to ensure aesthetic quality.

[0137] 7) During the concrete pouring process, a dedicated person should be assigned to monitor the formwork and strictly control its displacement and stability. If any displacement occurs, adjustments should be made in a timely manner and the supports should be reinforced.

[0138] 8) Exposed surface finishing of beams

[0139] When finishing the surface, use a scraper to smooth it, then use a wooden trowel to remove the grout, and finally use an iron trowel to smooth and finish it, ensuring that the flatness of the concrete surface meets the requirements.

[0140] 9) Health Preservation

[0141] After concrete is poured at room temperature, the exposed surface should be promptly wrapped with plastic film and then covered with felt to minimize the exposure time of the concrete surface and prevent surface moisture evaporation. Care should be taken that the covering material does not directly contact the concrete surface until the concrete has initially set.

[0142] Watering should be carried out using a perforated pipe system to ensure sufficient condensation inside the membrane, and the curing time should not be less than 28 days.

[0143] 10) Demolding

[0144] When erecting and dismantling formwork, reliable footholds should be provided for work at heights of 2 meters or more, and appropriate safety protection measures should be in place. The dismantling sequence should follow the principle of erecting first and dismantling later, and dismantling from top to bottom. Beam side formwork and column formwork can be removed after the concrete strength is sufficient to ensure that the surface and edges of the components will not be damaged during formwork removal. Because beams need to bear the construction load of the floor beams, they can only be removed after the strength reaches the design strength. After formwork removal, the outer surfaces of the scaffolded columns and beams should be covered with a film for protection in a timely manner, and watering or heat preservation treatment should be carried out according to different seasons.

[0145] (10) Construction of the remaining scaffolding

[0146] Repeat the previous (1) to (9) construction procedures until the scaffolding construction is completed. After completion, dismantle the support frame as required.

[0147] For information on fishway construction, please refer to [link / reference]. Figure 3 and Figure 4 .

[0148] (1) Erection of load-bearing supports for the first layer of fish passageway

[0149] 1) The fishway trough is arranged in a spiral pattern along the columns of the frame, with a total of 3 rows and 4 layers in each row, connected by a rest room in the middle. Each span can be constructed separately from bottom to top. The upper layer of the aqueduct is supported on the lower layer of the already constructed aqueduct. Each layer of the aqueduct can be constructed in sections according to the structure. The bottom slab of the aqueduct plus the side walls (including corbels) is cast in one go.

[0150] 2) The support frame is constructed using Ф48mm steel pipes. Six rows of columns are horizontally arranged at the bottom of the fishway, spaced 460mm apart, with a column spacing of 600mm in the span direction and a step distance of 1000mm. A base support and a 20cm wide wooden pad are installed at the bottom. The height of the support frame is adjusted by installing a top support. Nine 6×8cm square timbers are evenly arranged above the top support of the longitudinal columns at the bottom of the fishway as small beams at the bottom. A single Ф48×3.2mm steel pipe is horizontally installed as the main beam supporting the bottom formwork, spaced 600mm apart, the same as the longitudinal column spacing.

[0151] 3) Once the concrete reaches 70% of its design strength, it is sufficient to meet the upper load-bearing requirements. The lower support frame can be dismantled and reused after meeting the demolding strength required by the specifications and being no less than 70%. Other procedures and requirements are the same as for the first-layer beam support frame.

[0152] (2) Installation of the bottom formwork of the first layer of fish passage

[0153] The fish passageway is constructed entirely of 1.5cm thick plywood. The bottom formwork installation control and requirements are the same as those for the first layer of frame beam bottom formwork installation.

[0154] (3) Installation of reinforcement bars for the first layer of fish passageway

[0155] 1) Reinforcing bar installation shall be carried out strictly in accordance with the design requirements to ensure that the spacing between installation sections meets the design requirements. To ensure the thickness of the concrete cover, concrete spacers supporting the reinforcing bars shall be set between the reinforcing bars and the formwork. The strength of the spacers shall not be lower than the design strength of the concrete in the same location. The spacers shall be tied to the reinforcing bars with steel wires embedded in them. The spacers shall be staggered and distributed. Short steel bars shall be used to support the two rows of reinforcing bars to ensure accurate positioning.

[0156] 2) Reinforcing bars shall be welded. A trial weld must be performed before formal welding; only after passing the trial weld can formal welding commence. The weld length for a single-sided weld shall not be less than 10d, and for a double-sided weld, not less than 5d. The weld height shall be equal to or greater than 0.3d, and not less than 4mm; the weld width shall be equal to or greater than 0.7d (d being the diameter of the main reinforcing bar), and not less than 8mm. Welding materials shall comply with the relevant provisions of the current national standard "Code for Construction of Reinforcing Steel in Hydraulic Concrete".

[0157] (4) Installation of the side formwork for the first layer of fish passage

[0158] 1) The template is made of 1.5cm thick veneer plywood. The template is fixed around the perimeter and the walers are made of 5cm×10cm square timber. Except for the top and bottom square timbers, the other walers are set vertically with a spacing of 25cm. The template is prefabricated at the timber processing plant and then transported to the site for use.

[0159] 2) The formwork is fixed using an external top and internal bracing system, with side wall tie rods. External top: When there are beams on both sides of the fishway, the beams are used to support the formwork with square timber. When there are no beams, steel pipes, top supports, and outer scaffolding are used for support. One set is installed at the top and bottom, with a longitudinal spacing of 200cm, arranged in a staggered pattern. The first set is placed 75cm below the top of the side wall, and the second set is placed 100cm below the first set. Internal bracing: Steel pipes and top supports are used to support the inner side formwork between the two walls. The height and position of the internal bracing are the same as the external top. Double longitudinal steel pipes are installed at each support point. Tie rods: Φ16 tie rods are used for tie rods between the inner and outer formwork on each side wall, with two sets installed at the top and bottom, in the same positions as the external top and internal tie rods, spaced 50cm apart.

[0160] 3) The corbel formwork also uses 1.5cm thick veneer plywood. The bottom sloping formwork is fixed to the lower facade formwork with square timber walers. 5cm x 10cm square timber is installed around the vertical formwork. The vertical corbel formwork is fixed to the other side wall formwork using tie bolts (the bolts are fitted with PVC pipes inside the wall). The bottom is supported by square timber (the bottom of the square timber is supported on the longitudinal steel pipes with internal bracing). The corbel formwork on both sides uses square timber internal bracing. Double-sided tape is applied to all joints, applied straight and 1-2mm away from the inside of the panel, ensuring that the double-sided tape is flush with the inside of the panel after being squeezed. The double-sided tape must not be broken. Joints cannot be torn by hand; they must be cut with a blade.

[0161] (5) First layer of fish passage concrete pouring

[0162] 1) Concrete is centrally mixed at the concrete mixing plant and transported by 8m³ concrete trucks. Since the aqueduct is located inside the frame, it is difficult to pump concrete into the silo by truck. Therefore, HBT40 trailer pumps are used for pumping and tower cranes are used for hoisting into the silo.

[0163] 2) Concrete pouring should proceed intermittently in inclined layers from the lower end to the higher end, using a φ50 immersion flexible shaft vibrator for compaction. First, pour the base slab concrete, with a spreading length of 2-3 meters depending on supply and pouring capacity. Then, pour the corresponding side walls in layers, controlling the thickness of the side walls to approximately 40cm. Since no formwork is erected on the water-crossing surface of the fish passageway base slab, the base slab cannot be poured in one go; a thickness allowance of approximately 10cm should be left to prevent excessive height of the base slab due to concrete compression during the pouring of the side walls. The base slab concrete should be poured again after two layers of the side walls have been poured and before the initial setting of the base slab concrete.

[0164] 3) The free fall height of concrete should not exceed 1m to avoid segregation and aggregate separation. Other requirements and precautions are the same as those in the section on scaffolding concrete construction.

[0165] (6) Demolding, curing, and dismantling of support frames, etc.

[0166] Same as the scaffolding construction chapter.

[0167] (7) Construction of the remaining fish passageway

[0168] Repeat steps (1) to (6) above until construction is completed.

[0169] For information on prefabricated partition panel fabrication and installation, please refer to [link / reference]. Figure 5 .

[0170] (1) Prefabricated partition

[0171] The partitions are prefabricated in situ. Construction begins after the load-bearing supports for each layer of the fishway channel are removed and the channel is cleaned. Prefabrication uses custom-made plastic molds; the reinforcing steel is processed and tied in the steel processing yard, transported to the entrance of the frame structure by flatbed trucks, and then manually pushed to the prefabrication site by wheelbarrows. Concrete is pumped into the formwork using an HBT40 trailer pump and compacted using a φ30 flexible shaft vibrator. Lifting holes are provided at the top of the partitions during prefabrication.

[0172] (2) Partition installation

[0173] The partitions are prefabricated, connected and fixed to the base plate and side walls using angle iron and expansion bolts. The angle iron is ∠100×100×10, and the expansion bolts are M16×120. The spacing between the base plates is 25cm, and the spacing between the side walls is 50cm. A mobile 1.5t electric hoist gantry is used for lifting, installing each partition piece by piece from high to low. During hoisting, the partitions are first positioned according to the design requirements using a measuring tape and marked. Then, they are lifted and placed, and aligned using a straightedge. After alignment, initial fixing is immediately performed, and then the crane moves to the next installation point. Simultaneously, personnel are assigned to perform the final fixing of the pre-fixed partitions.

[0174] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0175] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A construction method of a fishway of a vertical joint type of a multi-layer disk folding baffle of a batter, characterized in that, This includes scaffolding construction and fishway construction; The scaffolding construction includes the following steps: S10. Install the first-layer column reinforcement and the first-layer column formwork; S20. Erect the support frame for the first-layer frame beam and install the bottom formwork for the first-layer frame beam. Then install the reinforcement bars and side formwork for the first-layer frame beam. S30. Install the embedded parts of the first-layer frame beams and pour concrete for the first-layer columns and frame beams; S40. Repeat steps S10-S30 until the scaffolding construction is completed; Fishway construction includes the following steps: S50. Construct the first layer of fishway support structure. S60. Install the bottom formwork of the first layer of fish passage channel, the steel reinforcement of the first layer of fish passage channel, and the side formwork of the first layer of fish passage channel. S70, First layer of fish passageway concrete pouring; S80. Repeat steps S50-S70 until the fish passage channel construction is completed. S90. Fabricate and install prefabricated partitions; Step S50, the erection of the first layer of fishway support, includes: S501, the fish passage is folded along the columns of the frame, with a total of 3 rows and 4 layers in each row. The middle is connected by a rest room. Each span is constructed separately from bottom to top. The upper aqueduct support is erected on the lower aqueduct that has been constructed. Each layer of aqueduct is constructed in sections according to the structure. The bottom slab and side walls of the aqueduct are cast in one go. S502. The support frame is erected using steel pipes. Multiple rows of columns with a preset spacing are set horizontally at the bottom of the fish passage. The column spacing and step distance in the span direction are in accordance with the preset standard. The bottom is set with a base support and a wide wooden pad. The height of the support frame is adjusted by setting a top support. Multiple square timbers are evenly arranged on the top of the longitudinal columns at the bottom of the fish passage as small beams at the bottom of the beam, and a single steel pipe is arranged horizontally as the main beam supporting the bottom formwork of the beam. The spacing is the same as the longitudinal spacing of the columns and reaches the preset value. S503. Once the concrete reaches 70% of its design strength, it can meet the upper load-bearing requirements. The lower support frame can be removed after it meets the demolding strength required by the specifications and is not less than 70%. Step S70, the pouring of the first layer of fishway channel concrete, includes: S701. Concrete pouring shall be carried out in an intermittent, inclined layer manner from the low end to the high end, and compacted with an immersion flexible shaft vibrator. When pouring concrete, first pour the base slab concrete, spreading it for 2-3m. Then pour the corresponding side walls in layers. Control the thickness of the side walls within the preset range and leave a thickness allowance. After the two side walls have been poured and before the base slab concrete has initially set, pour the base slab concrete again. The free fall height of the concrete shall not exceed 1m; Step S90, which involves fabricating and installing prefabricated partitions, includes: S901. The partition is prefabricated in situ. The prefabrication is carried out using customized plastic molds. The steel bars are processed and tied in the steel yard and transported to the prefabrication site by vehicle. The concrete is pumped into the formwork using an HBT40 trailer pump and vibrated with a flexible shaft vibrator. Lifting holes are set on the top of the partition during prefabrication. S902. The partition is assembled and is fixed to the base plate and side wall using angle iron and expansion bolts. The spacing between the base plates is 25cm and the spacing between the side walls is 50cm. Install the components piece by piece from high to low. During hoisting, first use a ruler to position and mark the location according to the design requirements, then lift and place them. Use a straightedge to calibrate the placement. After calibration, perform preliminary fixing immediately, then move the crane to the next installation point. At the same time, arrange personnel to carry out the final fixing of the pre-fixed partitions.

2. The construction method of a rack-type multi-stage and multi-layer disk folding baffle vertical slot fishway according to claim 1, characterized in that, Step S10 includes the installation of the first layer of column reinforcement bars: S101. Erect supporting scaffolding using the same steel pipes as the beam support frame in step S20. The longitudinal and transverse spacing between the scaffolding and the beam support frame should be equal or multiples of each other. Lay planks around the working surface and hang safety nets. S102. Tie the stirrups according to the design requirements for the spacing and quantity. First, stagger the hooks of the stirrups and put them on the pre-embedded steel bars of the lower foundation. Then, erect the column steel bars. The lap length and tying should be in accordance with the preset requirements, with the tying facing inward. S103. Set column positioning bars. The main bars of the vertical load-bearing column are connected by straight threads. The connection joints, sleeve dimensions and the thickness of the steel reinforcement protective layer meet the preset requirements. Among them, the stirrup joints are staggered on the vertical reinforcement, the stirrups are perpendicular to the main reinforcement, and the stirrups are tied to the main reinforcement and the stirrup joints. The top surface of the lower layer of exposed vertical reinforcement at the intersection with the beam is fixed with column hoops. The location of the rebar splices should avoid the stirrup-reinforced zone and be set in the area of ​​least stress. Adjacent rebar splices should be staggered by 35d and not less than 50cm. After the protective layer thickness reaches the threshold, spacers should be added with a spacing of 100cm. In areas where tying is difficult, the stirrups are made into spliced ​​types. After they are tied in place, they are welded into closed stirrups with a 10d overlap.

3. The construction method of a rack-type multi-stage and multi-layer disk folding baffle vertical slot fishway according to claim 1, characterized in that, Step S10 includes the installation of the first-layer column formwork, which includes: S111. The column formwork is fixed with high-strength bolts. The standard column section uses double-section prefabricated formwork, the intersection with the one-way beam uses triple-section prefabricated formwork, and the intersection with the two-way beam uses quadruple-section prefabricated formwork. S112. Before sealing the column formwork, conduct inspection and cleaning, leave space for the beam opening, or pour concrete only to the bottom of the beam, and fix the formwork around the perimeter with steel pipes and frames.

4. The construction method of the multi-layered folding partition vertical joint fishway according to claim 1, characterized in that, Step S20 includes erecting the support frame for the first-layer frame beam and installing the bottom formwork for the first-layer frame beam, including: S201. The beam support frame is erected using steel pipes. Multiple rows of columns are set horizontally at preset intervals at the bottom of the beam. The column spacing and step distance in the span direction are set according to preset requirements. Bottom supports and wide wooden pads are set at the bottom. Double steel pipes are set on the top of each row of columns in the longitudinal direction as the main beam supporting the bottom formwork of the beam. Square timbers are set at intervals in the transverse direction as small beams at the bottom of the beam. When the beam span is greater than 4m, the arch is raised at 1 / 1000 to 3 / 1000 of the total span length. S202. The bottom formwork of the beam is made of plywood. After the support frame is erected, the bottom formwork is laid. Before laying the formwork, the double steel pipe support beam and square timber beam are neatly laid according to the preset spacing requirements. Then the bottom formwork is laid. When laying, it should be connected with the column head or adjacent structure and nailed firmly. Wooden strips are used as supports and uprights.

5. The construction method of the multi-layered folding partition vertical joint fishway according to claim 1, characterized in that, Step S20 includes the installation of the first-layer frame beam reinforcement: S211. Binding steel bars in the preset sequence includes longitudinal steel bars through beams, installing beam stirrups, binding steel bars and padding protective layer; The binding process must meet the following requirements: the stirrups must be perpendicular to the main bars, the stirrup hooks must be staggered, and all intersections of the stirrup corners and the longitudinal bars must be securely tied. Tension reinforcement splices in beams should be avoided at the location of maximum bending moment. The splice locations should be staggered from each other within a 30d section of the stressed reinforcement and not less than 500mm apart. The percentage of the cross-sectional area of ​​stressed reinforcement with lap splices to the total cross-sectional area of ​​stressed reinforcement should not exceed 25% in the tension zone and not exceed 50% in the compression zone. The installation of the side formwork for the first-floor frame beams includes: S211. The side formwork is made of plywood, the longitudinal walers of the formwork are made of square timber, and the transverse walers are made of double steel pipes. S212. The template surface should be kept flat and evenly coated with release agent. The joints should be tightly assembled. The elevation position of the template surface should be measured, positioned, and marked. S213. The beam formwork is laid from both ends of the beam toward the middle, the embedded wood is arranged in the middle of the beam, and the cleaning opening of the beam is set at the end of the beam; S214. The formwork is fixed by external fixing and internal tie rods. The external fixing is achieved by connecting the vertical steel pipe of the formwork to the bottom horizontal bar of the bottom formwork and fixing it with fasteners. The tie rods are set with tie rods, one on each side of the beam, with a preset longitudinal spacing. The tie rods are threaded through PVC pipes. In addition, when setting up the formwork, the side formwork should wrap around the bottom formwork. At the connection between the beam formwork and the column formwork, the blanking size should be slightly shortened.

6. The construction method of the multi-layered folding partition vertical joint fishway according to claim 1, characterized in that, Step S30 includes the installation of the embedded parts for the first-layer frame beams: S301. The top surface of the crossbeam of the frame is fully covered with steel plates and anchor bars are welded. The plates are hoisted to the top surface of the beam, and the slope and elevation of the top surface are measured and controlled within the preset range. Spot welds are made on the main reinforcement of the beam. Concrete inlets are opened at the top of the steel plates at intervals of 1.0~1.5m. The inlets are welded back after the concrete is poured. The concrete pouring for the first-floor columns and frame beams includes: S301. The scaffolding is constructed using pumped concrete, transported by concrete mixer trucks, and pumped into the formwork by truck-mounted pumps. The column concrete is poured first, and then the construction proceeds from the already poured column end to the other end. S302. Before pouring the column, a layer of cement mortar of the same grade with a thickness of 2 to 3 cm should be laid first. S303. Concrete is centrally mixed at the concrete mixing plant, and the slump of the concrete is controlled between 18±2cm, and the initial setting time of the concrete is controlled within 8 hours. S304. Concrete placement: For frame columns, install the tremie pipe to 80-100cm above the pouring surface; for beams, use a truck pump hose to directly place the concrete. The layer thickness should be controlled at 30-40cm. Use a flexible shaft immersion vibrator for compaction. The vibration depth of the vibrator should generally not exceed 2 / 3 to 3 / 4 of the rod length. When vibrating, insert the vibrator quickly and pull it out slowly, and move the vibrator up and down continuously to ensure uniform compaction. When pouring in layers, the vibrator should be inserted 10cm into the lower layer of concrete. The moving distance should not be greater than 1.5 times the effective radius of the vibrator. It should be kept at least 5cm away from the side formwork. For each vibration point, the vibration duration should be 20-30s, until the concrete no longer settles, no air bubbles appear, and the surface shows a layer of slurry. The pouring is carried out continuously, and the upper layer of concrete must be poured and compacted before the lower layer of concrete has initially set. S305. Drain water from the pouring chamber during the pouring process to avoid opening holes in the formwork to drive away water and mortar. Remove mortar adhering to the formwork and reinforcing steel surface at any time. Control the flatness of the concrete surface within the preset range to ensure appearance quality. S306. Finish the exposed surface of the beam. When finishing, use a scraper to smooth it, then use a wooden trowel to remove the grout, and then use an iron trowel to smooth and polish it, ensuring that the flatness of the concrete surface meets the requirements. S307. Curing: After the concrete is poured at room temperature, the exposed surface is wrapped with plastic film and then covered with felt. The covering should avoid direct contact with the concrete surface until the concrete has initially set. Sprinkling is carried out using a flower pipe to ensure sufficient condensate water inside the membrane, and the curing time shall not be less than 28 days. S308. When dismantling or erecting formwork, reliable footings should be provided for work at heights of 2 meters or more, and appropriate safety protection structures should be in place. The formwork removal sequence should follow the principle of removing the formwork after the support is erected, removing the formwork after the support is erected, and removing it from top to bottom. The side formwork of beams and columns can be removed after the concrete strength is sufficient to ensure that the surface and edges of the components will not be damaged by the removal of the formwork. Beams need to bear the construction load of the layer beams and can only be removed after the strength reaches the design strength. After demolding, the outer surfaces of the columns and beams of the scaffolding are covered with a thin film for protection, and watering or heat preservation is carried out according to the season.

7. The construction method of the multi-layered folding partition vertical joint fishway according to claim 1, characterized in that, Step S60, the installation of the first layer of the fishway channel bottom mold, includes: S601. The fish passage channel is made of plywood. After the support frame is erected, the bottom formwork is laid. Before laying the formwork, the double steel pipe support main beam and square timber beam are neatly laid according to the preset spacing requirements. Then the bottom formwork is laid. When laying, it should be connected with the column head or adjacent structure and nailed firmly. Wooden strips are used as uprights and upright supports. The installation of the first layer of fish passage reinforcement includes: S611. Concrete spacers supporting the reinforcing bars shall be installed between the reinforcing bars and the formwork. The strength of the spacers shall not be lower than that of the concrete in the same location. The spacers shall be tied to the reinforcing bars with steel wires embedded in them. The spacers shall be staggered and distributed. Short steel bars shall be used for support between two rows of reinforcing bars. S612. Reinforcing bars shall be welded. The weld length of a single-sided weld shall not be less than 10d, and the weld length of a double-sided weld shall not be less than 5d. The weld height shall be equal to or greater than 0.3d and not less than 4mm. The weld width shall be equal to or greater than 0.7d and not less than 8mm, where d is the diameter of the main reinforcing bar. The installation of the first layer of fishway side mold includes: S621. The template is made of plywood. The template is fixed around the perimeter and the walers are made of square timber. Except for the top and bottom square timbers, the other walers are set vertically with a preset spacing. S622. The formwork is fixed by external top support and internal bracing, and side wall tie-down. External roof: When there are beams on both sides of the fish passage channel, the beams are used to support the roof with square timber and formwork. When there are no beams, steel pipes, top supports and outer frame are used to support the roof. One is set at the top and one at the bottom, with the longitudinal spacing set at the preset value and arranged in a quincunx pattern. The first set is set below the top of the side wall and the second set is set below the first set. Internal bracing: Steel pipes and top supports are used to support the inner side formwork between the two walls. The height and position of the internal bracing are the same as the outer top; a double longitudinal steel pipe is installed at each support point. Tie rods: Tie rods are used for the inner and outer formwork of each wall, with two sets, one at the top and one at the bottom, in the same positions as the outer top and inner tie rods, and the spacing is the preset value; S623. The corbel formwork is made of plywood. The bottom sloping formwork is fixed to the lower vertical formwork with square timber walers. Square timber is set around the vertical formwork. The vertical corbel formwork is fixed to the other side wall formwork with tie bolts. The bottom is supported by square timber. The corbel formwork on both sides is supported by square timber internal bracing. Double-sided tape should be applied to all seams, applied straight and 1-2mm away from the inside of the panel, ensuring that the double-sided tape is flush with the inside of the panel after being squeezed, and avoiding any breaks in the double-sided tape.

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