Rapid construction method of cast-in-place mixed assembly for water channel

Abstract

The present invention provides a method for rapid construction of a water channel by assembling cast-in-place mixed concrete, comprising the following steps: S01, excavating the side slope of the water channel, wherein the width of the side slope is greater than the width of the water channel; S02, prefabricating an assembled bottom channel, wherein the assembled bottom channel comprises a bottom plate with inclined webs on both sides, wherein the height of the webs is higher than the height of the water accumulated in the original water channel; S03, laying a cushion layer at the bottom of the excavated water channel; S04, hoisting the assembled bottom channel; S05, performing segmented continuous tensioning on the hoisted assembled bottom channel of each section; S06, constructing the side panels after the construction of the assembled bottom channel is completed; S07, after the construction of the water channel is completed, backfilling the outer side of the water channel, filling the backfill soil between the outer side of the water channel and the side slope, and compacting it; the rapid construction of the water channel is completed by the above steps. By adopting the construction method of the assembled bottom channel and cast-in-place side panels, construction can be carried out in accumulated water, and the rainy season will not affect the construction period, while the side panels are constructed in a waterless state, achieving a balance between construction efficiency and cost.

Description

Technical Field

[0001] The invention relates to the field of water channel construction, in particular to a method for quickly assembling cast-in-situ mixing of water channels. Background Art

[0002] Existing water channel construction generally adopts vertical formwork casting construction or fully assembled construction methods. Due to the influence of water accumulation at the construction site, the efficiency of fully cast-in-place construction is difficult to guarantee. The establishment of cofferdams and drainage has greatly affected the construction efficiency. For example, patent document CN111074852A records a method for casting channel lining concrete in situ and a non-linear channel lining construction method. It is an existing technology for cast-in-place construction methods. It adopts a two-casting method for casting, which further affects the construction efficiency. In addition, the appearance accuracy of this construction method is difficult to guarantee and the shape is not regular enough. The fully assembled construction method is subject to the limitations of on-site construction conditions and has many unfavorable factors. For example, the cast-in-place prefabricated components are heavy and difficult to hoist. In addition, each assembly component is greatly affected by the deformation of the foundation. For example, a water channel with an inclined slope needs to lay a slag foundation cushion layer and compact the foundation on the inclined slope, which increases the construction cost and prevents the high efficiency characteristics of the assembled water channel from being brought into play. For example, Chinese patent documents such as CN207176634U, a prefabricated water channel; CN213267773U, a prefabricated prefabricated water channel; and CN211113976U, a prefabricated water channel, are only suitable for small rectangular water channels and are difficult to apply to "V"-shaped water channels, thus failing to meet the needs of water supply projects. CN220767938U describes a pre-embedded support device for prefabricated water channel plates, which supports the channel via foldable pre-embedded movable plates. However, its implementation cost is prohibitive and, moreover, it is not feasible for larger water channels. CN116971337A describes a prefabricated water channel construction process, in which segments are connected by snap-fit ​​protrusions and snap-fit ​​grooves. However, as the components increase in size and the foundation deforms, this splicing increases the precision requirements for each segment. This is affected by terrain slope, foundation deformation, component self-deformation, and machining precision errors, making it difficult to achieve in the actual construction of water channels wider than 4 meters. Based on this need, a new rapid construction method suitable for "V"-shaped water diversion channels over 5 meters is designed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a rapid construction method for assembling cast-in-place mixing of water channels, which can improve the construction efficiency of "V"-shaped water channels with a length of more than 5 meters, especially the construction efficiency of water channels under waterlogging conditions.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for rapidly constructing a water channel assembly by cast-in-situ mixing, comprising the following steps:

[0005] S01. Excavate the side slope of the canal, the width of the slope is greater than the width of the canal;

[0006] S02, prefabricated bottom channel, the prefabricated bottom channel includes a bottom plate with inclined webs on both sides, the height of the webs being higher than the height of the water in the original channel;

[0007] S03. Lay a cushion layer at the bottom of the excavated canal;

[0008] S04, hoisting assembled bottom channel;

[0009] S05. Conduct segmented continuous tensioning on the hoisted assembled bottom channel of each segment;

[0010] S06. After the construction of the prefabricated bottom channel is completed, the side panels will be constructed;

[0011] S07. After the construction of the canal is completed, backfill the outside of the canal, fill the backfill soil between the outside of the canal and the slope, and compact it;

[0012] The above steps complete the rapid construction of the canal.

[0013] In a preferred solution, in step S02, the water channel is divided into a plurality of straight segments and curved segments, and the curved segments are fitted into a combination of a plurality of straight segments and fan-shaped segments.

[0014] In a preferred embodiment, horizontally extending extension seats are provided on both sides of the bottom plate, and side ribs are provided between the extension seats and the outer wall of the web, and the side ribs are arranged at a certain interval;

[0015] Extension bars and reinforcement holes are provided on the top end face of the web. The extension bars are used to be inserted into the steel cage of the side plate, and the reinforcement holes are used to insert the vertical bars in the steel cage to connect the steel bars of the web and side plates into one.

[0016] In a preferred solution, in steps S03 to S05, laying of the cushion layer, hoisting of the assembled bottom channel and tensioning construction can be carried out in water without draining the accumulated water.

[0017] In a preferred solution, in step S05: tensioning holes are provided in the assembled bottom channel along the longitudinal direction;

[0018] A hand hole is provided at the end of the tensioning hole for installing the seventh nut, the pressure plate and the second nut sleeve;

[0019] During hoisting, geotextiles are laid between the segments, prestressed tendons are inserted and expansion joint layers are installed first, then the prefabricated bottom channel is hoisted into place and the prestressed tendons are tensioned to the preset value.

[0020] In a preferred embodiment, in step S05: in one segment, one end of the prestressed tendon is located in the hand hole of the prefabricated bottom channel, passes through the pressure plate and is connected to the seventh nut, the other end of the prestressed tendon passes through the tensioning hole of the prefabricated bottom channel, another pressure plate and is connected to another seventh nut, the prestressed tendon is tensioned by the through-type hydraulic cylinder, and then the seventh nut is tightened to complete the tensioning operation of the prestressed tendon;

[0021] In the next section of the assembled bottom channel, the second nut sleeve is fixedly connected to the end of the prestressed tendon of the next section. The prestressed tendon passes through the tensioning hole and pressure plate of the next section of the assembled bottom channel and is connected to the seventh nut. The above steps are continued to complete the tensioning of the prestressed tendons of each section.

[0022] In a preferred solution, in step S06, for straight segments, a cast-in-place method using a sliding form is used for construction; for curved segments, a cast-in-place method using a vertical form is used for construction.

[0023] In the preferred solution, S601, during the construction of the straight section, the ground is compacted in an array manner on the slope and the sliding support structure is inserted;

[0024] The structure of the sliding support structure is as follows: a first screw rod passes through a first soil-pressing limit plate, a first nut is provided on the first screw rod, and a support roller is provided at the end of the first screw rod; the rotation direction of the support roller is along the flow direction of the water channel;

[0025] Driving a plurality of first screws into the compacted ground in an array arrangement, with the first screws perpendicular to the surface of the slipform, tightening the first nuts to press the first soil compaction limit plate against the ground; and making the upper surfaces of the plurality of support rollers lie on a plane;

[0026] S602, installing the steel cage on the upper end surface of the assembled bottom channel;

[0027] The steel cage is made of vertical bars, longitudinal bars and stirrups tied or welded together. During installation, the extension bars on the upper end of the assembled bottom channel are inserted into the steel cage, and part of the vertical bars are inserted into the reinforcement holes on the upper end of the assembled bottom channel.

[0028] S603. Install the slipform. The slipform is an inverted U-shaped structure with openings for grouting and vibrating at the top. The outer side of the slipform, i.e., the side away from the center of the canal, rests on the support rollers of the sliding support structure and can slide along the support rollers to fine-tune its position. Limit blocks are provided on the steel cage to limit the distance between the steel cage and the inner wall of the slipform.

[0029] S604. Pour concrete from the top of the slipform and vibrate it thoroughly according to the design requirements. After initial setting, remove the slipform and proceed to the next section for pouring. Continue to cover the side panels with geotextiles for moisture retention and maintenance.

[0030] In the preferred solution, S611, during construction of the curved section, the ground is compacted in an array manner on the slope and formwork support rods are inserted;

[0031] The formwork support rod structure includes a third screw rod, which is provided with a second soil-pressing limit plate and a sixth nut. A support bowl pad and a fifth nut are also provided at the top end of the third screw rod. The third screw rods are driven into the slope in an array arrangement, with the top end positioned roughly flush. The sixth nut is tightened to press the second soil-pressing limit plate against the ground to provide support.

[0032] Adjust the position of the fifth nut so that the upper surfaces of the supporting bowl-shaped pads remain flush. A groove is provided in the center of the supporting bowl-shaped pad, with the opening of the groove facing upward for accommodating the first nut sleeve;

[0033] S612. First, set up the outer template. A vertical rod is provided at the bottom of the outer template. The vertical rod is partially inserted into the hole reserved in the extension seat. An opening is provided at the position of the outer template corresponding to the template support rod for installing the first nut sleeve and the second screw;

[0034] Hoisting the steel cage, which is made of vertical bars, longitudinal bars and stirrups tied or welded together. The steel cage is equipped with limit blocks to limit the distance between the steel cage and the outer and inner formwork;

[0035] S613. During installation, the extension bars on the upper end face of the assembled bottom channel are inserted into the reinforcement cage, and part of the vertical bars are inserted into the reinforcement holes on the upper end face of the assembled bottom channel;

[0036] The second screw is passed through the steel cage and the sealing gasket, the first nut sleeve at the end of the second screw is fixedly connected with the third screw thread, and the fourth nut is tightened to fix the position of the outer template;

[0037] Adjust the position of the third nut and set the inner template. The inner template is also provided with an opening corresponding to the template support rod. The second screw is passed through the opening and the second nut is tightened to fix the inner template.

[0038] S614. Pour concrete from the top, remove the formwork after initial setting, cover the side panels with geotextile and continue curing.

[0039] In the preferred solution, in step S07, before backfilling, check whether there is any leakage in the accumulated water in the canal. If leakage is found, the leakage location is first detected and then backfilled. The treatment methods include grouting repair with polymer mortar, partial replacement and repair of the expansion joint layer.

[0040] The present invention provides a method for rapid construction of a water channel by assembling cast-in-place hybrids. By adopting a construction method of assembled bottom channels and cast-in-place side panels, construction can be carried out in accumulated water, and the rainy season will not affect the construction period. The side panels are constructed in a waterless state, achieving a balance between construction efficiency and cost, and greatly improving construction efficiency. The solution of the present invention also avoids the construction process of tamping the slope, and by backfilling after casting, it greatly reduces labor and further improves construction efficiency. Moreover, the water channel constructed by the present invention has a regular shape and beautiful appearance. A balance is achieved between cost, benefit and efficiency, which is conducive to the implementation of transformation. It is suitable as a standard construction plan for large and medium-sized water transfer projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below with reference to the accompanying drawings and examples:

[0042] Figure 1 It is a schematic top view of the water delivery channel of the present invention.

[0043] Figure 2 It is a schematic cross-sectional view of the assembled bottom channel of the present invention.

[0044] Figure 3 This is a schematic cross-sectional view of the slipform construction on one side of the water channel of the present invention.

[0045] Figure 4 This is a cross-sectional schematic diagram of the slipform construction on the other side of the water channel of the present invention.

[0046] Figure 5 This is a schematic diagram of the structure of the water channel after backfilling of the present invention.

[0047] Figure 6 Schematic diagram of the sliding support structure of the present invention.

[0048] Figure 7 It is a partial front view of the assembled bottom channel of the present invention.

[0049] Figure 8 It is a schematic diagram of the structure of the assembled bottom channel after connection of the present invention.

[0050] Figure 9 It is a schematic diagram of the connection structure of the prestressed reinforcement of the assembled bottom channel of the present invention.

[0051] Figure 10 It is a schematic diagram of the connection structure of the prestressed tendons of the present invention.

[0052] Figure 11 It is a structural schematic diagram of the present invention when the formwork on both sides of the water channel is cast in situ.

[0053] Figure 12 It is a structural schematic diagram of the template support rod of the present invention.

[0054] Figure 13 It is a partial schematic diagram of the top end surface of the assembled bottom channel of the present invention.

[0055] In the figure: water channel 1, slope 2, assembled bottom channel 3, bottom plate 31, web 32, tensioning hole 33, extension rib 34, extension seat 35, hand hole 36, side rib 37, reinforcement hole 38, water accumulation 4, cushion layer 5, sliding support structure 6, first soil pressure limit plate 61, first nut 62, first screw 63, support roller 64, prestressed rib 7, formwork support rod 8, second nut 81, third nut 82, second screw 83, fourth nut 84, Sealing gasket 85, first nut sleeve 86, supporting bowl-shaped pad 87, fifth nut 88, sixth nut 89, third screw 801, second soil pressing limit plate 802, backfill soil 9, slipform 10, steel cage 11, limit block 111, vertical reinforcement 112, longitudinal reinforcement 113, stirrups 114, side plate 12, seventh nut 13, pressure plate 14, second nut sleeve 15, expansion joint 16, inner formwork 17, surrounding order 18, outer formwork 19. DETAILED DESCRIPTION

[0056] like Figure 1 As shown in , a certain irrigation project requires the construction of a canal 1, which includes multiple straight segments A and C, as well as a curved segment B. Because there are buildings or mountains on both sides of the canal 1, the curved segment is relatively complex. Affected by surface runoff, a lot of water 4 accumulates in the canal 1. In the early stage, a slipform construction scheme was considered, which required the installation of a cofferdam to block water and a water collection well to drain the water before construction. The construction efficiency was low, and it was difficult to use the slipform at the location of the curved segment B. The vertical formwork cast-in-place construction method made the slope construction difficult and the appearance unsightly. It was necessary to set up cofferdams to block water and pump water in sections, resulting in low construction efficiency. Since the width of the canal 1 exceeds 5 meters, the assembled water channel components are large in size and difficult to transport to the site. In addition, the side walls are "V" shaped. This cantilever structure also makes lifting very difficult, and the wall thickness of the overall structure needs to be increased, which also increases the construction cost.

[0057] In order to overcome the above construction difficulties, the present invention proposes a method for rapid construction of a water channel assembly cast-in-place mixing, comprising the following steps:

[0058] S1, divide the canal 1 into a plurality of straight segments and curved segments along the flow direction, preferably, the straight segments are prepared into a prefabricated bottom canal 3 with a segment of 30 meters; the curved segments are fitted into a plurality of straight segments and fan-shaped segments; Figure 1 As shown in .

[0059] S2, excavating the side slope of the canal 1, wherein the width of the side slope is greater than the width of the canal 1;

[0060] S3, prefabricated assembled bottom channel 3, the length of a single prefabricated assembled bottom channel 3 is 30 meters, and the straight line segment and fan-shaped segment used for fitting need to be prepared according to the actual length of the curve segment fitting;

[0061] like Figure 2 As shown in the figure, the assembled bottom channel 3 includes a bottom plate 31 with inclined webs 32 on both sides. The height of the webs 32 is higher than the height of the water 4 in the original channel, so that the part above the webs 32 can be constructed without water, while also reducing the volume and weight of the assembled bottom channel 3.

[0062] In this example, the width of the bottom plate 31 of the assembled bottom channel 3 is 6 meters, the width at the web 32 is 7.4 meters, the height is 2.1 meters, and the wall thickness is 0.2 meters. Horizontally extending extension seats 35 are provided on both sides of the bottom plate 31, and side ribs 37 are provided between the extension seats 35 and the outer wall of the web 32. The side ribs 37 are arranged at intervals of 1 to 1.2 meters. This structure ensures strength while reducing the overall weight. The 330-meter section of the assembled bottom channel in this example is about 150t. It can be equipped with a 160t all-terrain truck crane for centralized construction. Reduce the need for special construction equipment, such as crawler cranes. For easy observation, Figures 7-10 Partial cut-off display is done.

[0063] like Figures 2 to 5 13, an extension rib 34 and a rib insertion hole 38 are provided at the top end of the web 32. The extension rib 34 is used to be inserted into the steel cage 11 of the side plate 12, and the rib insertion hole 38 is used to insert the vertical ribs in the steel cage 11 so that the web 32 and the steel bars of the side plate 12 are connected as one.

[0064] like Figures 2 to 5 In the embodiment, tensioning holes 33 are longitudinally provided in the prefabricated bottom channel 3. In this example, the tensioning holes 33 are arranged at intervals on the bottom plate 31 and the web 32. Hand holes 36 are provided at the ends of the tensioning holes 33 for mounting the seventh nut 13, the pressure plate 14, and the second nut sleeve 15.

[0065] S4. Lay a cushion layer 5 at the bottom of the excavated canal. The cushion layer 5 is made of graded crushed stone and rolled flat. The cushion layer can be directly constructed in the accumulated water 4.

[0066] S5. Assemble the prefabricated bottom channel 3 on-site. During installation, geotextiles are laid between segments, prestressed tendons 7 are threaded, and expansion joints 16 are installed. Then, the prefabricated bottom channel 3 is hoisted into place. Each segment of the hoisted prefabricated bottom channel 3 is tensioned continuously in sections, with the prestressed tendons 7 tensioned to the preset value.

[0067] like Figure 9 、 10As shown, in one section, one end of the prestressed tendon 7 is located in the hand hole 36 of the prefabricated bottom channel 3, passes through the pressure plate 14 and is connected to the seventh nut 13. The other end of the prestressed tendon 7 passes through the tensioning hole 33 of the prefabricated bottom channel 3, and is connected to another pressure plate 14 and another seventh nut 13. The prestressed tendon 7 is tensioned by a through-type hydraulic cylinder and the seventh nut 13 is tightened to complete the tensioning operation of the prestressed tendon 7. Usually, the tensioning is extended to 105% of the preset value, and after holding the force for a period of time, it is restored to 100% of the preset value. In the prefabricated bottom channel 3 of the next section, the second nut sleeve 15 is fixedly connected to the end of the prestressed tendon 7 of the next section. The prestressed tendon 7 passes through the tensioning hole 33 of the prefabricated bottom channel 3 of the next section, and is connected to the pressure plate 14 and the seventh nut 13. The above steps are continued to complete the tensioning of the prestressed tendons 7 in each section. The position of the contraction layer 16 is also compressed, achieving a better waterproofing effect.

[0068] S6. After the prefabricated bottom channel 3 is constructed, the side panels 12 can be constructed simultaneously. For straight sections A and C, cast-in-place using slipforms 10 is preferred. For curved section B, cast-in-place using vertical formwork is preferred. Because the top end of the prefabricated bottom channel 3 is located above the surface of the accumulated water 4, the side panels 12 can be constructed under dry conditions, resulting in high construction efficiency.

[0069] S601, such as Figures 3-5 In the construction of straight sections A and C, the ground is compacted in an array on the slope and the sliding support structure 6 is inserted;

[0070] like Figure 3 、 4 In FIG. 6 , the structure of the sliding support structure 6 is as follows: a first screw 63 passes through a first soil-pressing limit plate 61, a first nut 62 is provided on the first screw 63, and a support roller 64 is provided at the end of the first screw 63. The support roller 64 rotates in the direction of water flow in the canal 1.

[0071] Multiple first screws 63 are driven into the compacted ground in an array arrangement, perpendicular to the surface of the slipform 10. The first nuts 62 are tightened to press the first soil-pressing limit plate 61 against the ground, so that the upper surfaces of the multiple support rollers 64 are aligned.

[0072] S602: Install the steel cage 11 on the upper end face of the prefabricated bottom channel 3. The steel cage 11 is made of vertical bars 112, longitudinal bars 113, and stirrups 114 that are tied or welded together. During installation, the extension bars 34 on the upper end face of the prefabricated bottom channel 3 are inserted into the steel cage 11, and part of the vertical bars 112 are inserted into the bar insertion holes 38 on the upper end face of the prefabricated bottom channel 3.

[0073] S603. Hoist the slipform 10. The slipform 10 is an inverted U-shaped structure with openings for grouting and vibration at its top. The outer side of the slipform 10, i.e., the side away from the center of the canal 1, rests on the support rollers 64 of the sliding support structure 6 and can be fine-tuned along the support rollers 64. A limit block 111 is provided on the steel cage 11 to limit the distance between the steel cage 11 and the inner wall of the slipform 10.

[0074] S604. Pour concrete from the top of the slipform 10 and vibrate thoroughly according to design requirements. After initial setting, remove the slipform 10 and proceed to the next section for pouring. In this example, the slipform 10 is 6 meters long. The spacing of the expansion joints is consistent with that of the prefabricated bottom channel 3. After the slipform 10 is removed, the side panels 12 are covered with geotextile for moisture retention and curing. If construction is carried out in winter, insulation and anti-freeze measures are also required.

[0075] S611, such as Figure 11 As shown in , during the construction of the curved section B, the ground is compacted in an array on the slope and formwork support rods 8 are inserted;

[0076] like Figure 11 、 12 As shown in the figure, the structure of the formwork support rod 8 includes a third screw rod 801, on which a second soil-pressing limit plate 802 and a sixth nut 89 are provided. A support bowl pad 87 and a fifth nut 88 are also provided at the top end of the third screw rod 801. The third screw rods 801 are driven into the slope in an array arrangement, with the top end positioned roughly flush. The sixth nut 89 is tightened to press the second soil-pressing limit plate 802 against the ground to provide support. The position of the fifth nut 88 is adjusted to keep the upper surfaces of each support bowl pad 87 flush. A groove is provided in the center of the support bowl pad 87, with the opening of the groove facing upward to accommodate the first nut sleeve 86.

[0077] S612, such as Figure 11 As shown in the figure, the outer template 19 is first set up, and a vertical rod is provided at the bottom of the outer template 19, which is partially inserted into the hole reserved in the extension seat 35. An opening is provided at the position corresponding to the outer template 19 and the template support rod 8 for installing the first nut sleeve 86 and the second screw 83.

[0078] The steel cage 11 is hoisted. The steel cage 11 is made of vertical bars 112, longitudinal bars 113 and stirrups 114 tied or welded together. A limit block 111 is provided on the steel cage 11 to limit the distance between the steel cage 11 and the outer formwork 19 and the inner formwork 17.

[0079] S613. During installation, the extension ribs 34 on the upper end face of the assembled bottom channel 3 are inserted into the steel cage 11, and part of the vertical ribs 112 are inserted into the rib insertion holes 38 on the upper end face of the assembled bottom channel 3. The second screw 83 passes through the steel cage 11 and the grouting gasket 85, and the first nut sleeve 86 at the end of the second screw 83 is threadedly fixedly connected with the third screw 801. The grouting gasket 85 uses two "C"-shaped gaskets. The openings of the grouting gaskets 85 are staggered and stacked to form a grouting stop structure. Tighten the fourth nut 84 to fix the position of the outer formwork 19. Adjust the position of the third nut 82, set the inner formwork 17, and temporarily support the inner formwork 17 with wooden strips at the bottom of the inner formwork 17. The inner formwork 17 is also provided with an opening corresponding to the formwork support rod 8. The second screw 83 passes through the opening and tightens the second nut 81 to fix the inner formwork 17. Install the enclosure 18 to strengthen the formwork structure. If necessary, additional tie rod screws can be added. Concrete is poured from the top, preferably using C30 or C40 concrete. After vibrating thoroughly according to design requirements, the concrete is cured in the formwork. After initial setting, the formwork is removed and the side panels 12 are covered with geotextile for continued curing. If construction is carried out in winter, insulation and anti-freeze measures are also required. Using a vertical formwork cast-in-place method, the construction length can be the same as the length of the prefabricated bottom channel 3.

[0080] S7. After the construction of the canal 1 is completed, backfill the outer side of the canal 1, fill the backfill soil between the outer side of the canal 1 and the slope, and compact it.

[0081] Before backfilling, check whether there is any leakage in the water channel. If leakage is found, the leakage location is first emptied and then backfilled. The treatment methods include grouting with polymer mortar, partial replacement and repair of the expansion joint layer 16, etc.

[0082] The above steps complete the rapid construction of the water channel 1. During the construction process, because there is no need to completely drain the accumulated water, construction can be carried out with water, which greatly improves the efficiency of the project. It is especially suitable for the southern region with distinct dry and rainy seasons.

[0083] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for rapid construction of cast-in-situ mixing of water channel assemblies, characterized by: The following steps are involved: S01, excavating the side slope of the canal (1), wherein the width of the side slope is greater than the width of the canal (1); S02, a prefabricated assembled bottom channel (3), the assembled bottom channel (3) comprising a bottom plate (31), with inclined webs (32) provided on both sides, the height of the webs (32) being higher than the height of the accumulated water (4) in the original channel; S03, laying a cushion layer (5) at the bottom of the excavated canal; S04, hoisting assembled bottom channel (3); S05, performing segmented continuous tensioning on the hoisted assembled bottom channel (3) of each segment; S06. After the construction of the assembled bottom channel (3) is completed, the side panels (12) are constructed; The side panels (12) are constructed by cast-in-place method; S07. After the construction of the canal (1) is completed, backfill the outer side of the canal (1), fill the backfill soil between the outer side of the canal (1) and the slope, and compact it; The rapid construction of the water channel (1) is completed through the above steps.

2. A method for rapid construction of cast-in-situ mixing of water channel assemblies according to claim 1, characterized in that: In step S02, the water channel (1) is divided into a plurality of straight segments and curved segments, and the curved segments are fitted into a combination of a plurality of straight segments and fan-shaped segments.

3. A method for rapid construction of cast-in-situ mixing of water channel assemblies according to claim 1, characterized in that: Horizontally extending extension seats (35) are provided on both sides of the bottom plate (31), and side ribs (37) are provided between the extension seats (35) and the outer wall of the web (32), and the side ribs (37) are arranged at a certain interval; An extension rib (34) and a rib insertion hole (38) are provided on the top end surface of the web (32). The extension rib (34) is used to be inserted into the steel cage (11) of the side plate (12). The rib insertion hole (38) is used to insert the vertical ribs in the steel cage (11) so that the web (32) and the steel bars of the side plate (12) are connected as one.

4. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 1, characterized in that: In steps S03 to S05, laying of the cushion layer, hoisting of the assembled bottom channel and tensioning construction can be carried out in water without draining the accumulated water.

5. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 1, characterized in that the steps In S05: a tensioning hole (33) is provided in the longitudinal direction of the assembled bottom channel (3); A hand hole (36) is provided at the end of the tensioning hole (33) for mounting the seventh nut (13), the pressure plate (14) and the second nut sleeve (15); During hoisting, geotextiles are laid between the segments, prestressed tendons (7) are first inserted and expansion joint layers (16) are installed, and then the assembled bottom channel (3) is hoisted into place and the prestressed tendons (7) are tensioned to a preset value.

6. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 5, characterized in that the steps In S05: in one segment, one end of the prestressed tendon (7) is located in the hand hole (36) of the assembled bottom channel (3), passes through the pressure plate (14) and is connected to the seventh nut (13), and the other end of the prestressed tendon (7) passes through the tensioning hole (33) of the assembled bottom channel (3), another pressure plate (14) and is connected to another seventh nut (13), and the prestressed tendon (7) is tensioned by the through-type hydraulic cylinder and then the seventh nut (13) is tightened to complete the tensioning operation of the prestressed tendon (7); In the assembled bottom channel (3) of the next section, the second nut sleeve (15) is fixedly connected to the end of the prestressed tendon (7) of the next section, and the prestressed tendon (7) passes through the tensioning hole (33) of the assembled bottom channel (3) of the next section, and the pressure plate (14) is connected to the seventh nut (13). The above steps are continued to complete the tensioning of the prestressed tendons (7) of each section.

7. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 2, characterized in that the steps In S06, for the straight segments (A, C), the cast-in-place method using a slip form (10) is used for construction; for the curved segment (B), the cast-in-place method using a vertical form is used for construction.

8. A method for rapid construction of cast-in-situ mixing of water channel assemblies according to claim 7, characterized in that: S601. During the construction of the straight segments (A and C), the ground is compacted in an array on the slope and the sliding support structure (6) is inserted; The structure of the sliding support structure (6) is as follows: a first screw rod (63) passes through a first soil-pressing limiting plate (61); a first nut (62) is provided on the first screw rod (63); and a support roller (64) is provided at the end of the first screw rod (63); the rotation direction of the support roller (64) is along the flow direction of the water channel (1); Driving a plurality of first screw rods (63) into the compacted ground in an array arrangement, with the first screw rods (63) being perpendicular to the surface of the sliding form (10), tightening the first nut (62) to press the first soil-pressing limit plate (61) against the ground; and making the upper surfaces of the plurality of support rollers (64) lie on a plane; S602, installing the steel cage (11) on the upper end surface of the assembled bottom channel (3); The steel cage (11) is formed by tying or welding vertical bars (112), longitudinal bars (113) and stirrups (114). During installation, the extension bars (34) on the upper end surface of the assembled bottom channel (3) are inserted into the steel cage (11), and part of the vertical bars (112) are inserted into the bar insertion holes (38) on the upper end surface of the assembled bottom channel (3); S603, hoisting the slipform (10), the slipform (10) is an inverted "U"-shaped structure, and an opening for grouting and vibrating is provided at the top of the slipform (10), and the outer side of the slipform (10), that is, the side away from the center of the water channel (1), leans on the support roller (64) of the sliding support structure (6) and can slide along the support roller (64) to fine-tune the position; a limit block (111) is provided on the steel cage (11) for limiting the distance between the steel cage (11) and the inner wall of the slipform (10); S604, pour concrete from the top of the slipform (10), fully vibrate according to the design requirements, and after initial setting, remove the slipform (10) to pour the next section, and continue to cover the side plate (12) with geotextile for moisture maintenance.

9. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 7, characterized in that: S6 11. When constructing the curved section (B), compact the ground in an array on the slope and insert the formwork support rods (8); The structure of the template support rod (8) includes a third screw rod (801), a second soil-pressing limit plate (802) and a sixth nut (89) are provided on the third screw rod (801), and a supporting bowl-shaped pad (87) and a fifth nut (88) are further provided at the top end of the third screw rod (801). The third screw rod (801) is driven into the slope in an array arrangement, and the position of the top end is kept roughly flush. The sixth nut (89) is tightened to make the second soil-pressing limit plate (802) press against the ground to provide support; Adjust the position of the fifth nut (88) so that the upper surfaces of the supporting bowl-shaped pads (87) remain flush, and a groove is provided in the center of the supporting bowl-shaped pad (87), with the opening of the groove facing upward for accommodating the first nut sleeve (86); S612, first set the outer template (19), the bottom of the outer template (19) is provided with a vertical rod, which is partially inserted into the hole reserved in the extension seat (35), and an opening is provided at a position corresponding to the outer template (19) and the template support rod (8) for installing the first nut sleeve (86) and the second screw (83); Hoisting a steel cage (11), wherein the steel cage (11) is formed by tying or welding vertical bars (112), longitudinal bars (113) and stirrups (114), and a limit block (111) is provided on the steel cage (11) for limiting the distance between the steel cage (11) and the outer formwork (19) and the inner formwork (17); S613, during installation, the extension reinforcement (34) on the upper end surface of the assembled bottom channel (3) is inserted into the reinforcement cage (11), and part of the vertical reinforcement (112) is inserted into the reinforcement hole (38) on the upper end surface of the assembled bottom channel (3); The second screw rod (83) is passed through the steel cage (11) and the sealing gasket (85), the first nut sleeve (86) at the end of the second screw rod (83) is threadedly fixedly connected to the third screw rod (801), and the fourth nut (84) is tightened to fix the position of the outer template (19); Adjust the position of the third nut (82), set the inner template (17), and also provide an opening corresponding to the template support rod (8) on the inner template (17). The second screw (83) passes through the opening and tightens the second nut (81) to fix the inner template (17); S614. Pour concrete from the top, remove the formwork after initial setting, cover the side panels (12) with geotextile and continue curing.

10. A method for rapid construction of a water channel assembly cast-in-situ mixing according to claim 1, characterized in that: In step S07, before backfilling, check whether there is any leakage in the water in the canal. If leakage is found, the leakage location is first removed and then backfilled. The treatment methods include grouting with polymer mortar, partial replacement and repair of the expansion joint layer (16).

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