Anti-frost heaving construction process for thin-wall concrete slope protection of channel

Abstract

The invention provides a frost heaving prevention construction process for a thin-wall concrete slope protection of a channel, and belongs to the technical field of water conservancy projects. The method comprises the following steps that S100, slope making is conducted on a slope protection area, and a slope surface is formed; s200, a heat preservation layer is laid on the slope surface; s300, slope surface concrete is poured on the heat preservation layer, and the heat preservation layer is covered with the slope surface concrete; the thickness of the slope concrete is larger than that of the heat preservation layer. The heat preservation layer is additionally arranged on the lower portion of the slope surface concrete, frost heaving of soil on the lower portion of the slope protection in winter can be avoided, and therefore it is guaranteed that stress of the slope surface concrete is uniform, and damage of freezing and thawing to the river channel slope protection is avoided or reduced.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, and more specifically, it relates to a construction process for preventing frost heave of thin-walled concrete slope protection for channels. Background Technology

[0002] Riverbank protection structures are common features used to prevent hydraulic erosion in rivers. Currently, the most common methods are dry-laid stone, mortar-grouted stone, or concrete masonry, which essentially adds a protective shell against erosion to the surface of the soil slope. However, in northern regions, the freezing and thawing of rivers in winter can easily cause cracks and deformation in riverbank protection structures, and in severe cases, large sections of the protection structure can slide into the river.

[0003] Our research revealed that uneven frost heave in the lower part of the slope is a significant cause of this problem. Specifically, the portion of the soil below the phreatic line is water-saturated, meaning the soil pores are filled with water. When temperatures drop below freezing, the river surface freezes, and the soil below the phreatic line gradually cools due to heat transfer, causing significant frost heave below the phreatic line. However, the soil above the phreatic line, with its lower moisture content, experiences less frost heave, resulting in uneven support for the slope and even cavities in the middle of the slope. Repeated freeze-thaw cycles weaken the slope's inherent strength, and the combined effects of the slope material's weight and the pressure from floating ice cause a surge in localized stress. Over time, this process leads to cracks and deformation in the riverbank slope, and in severe cases, large sections of the slope can slide into the river, gradually losing its protective function. Summary of the Invention

[0004] The purpose of this invention is to provide a construction process for preventing frost heave in thin-walled concrete slope protection of channels, so as to solve the technical problem that river slope protection is easily damaged under freeze-thaw action in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a construction process for preventing frost heave in thin-walled concrete slope protection of channels, comprising the following steps: S100. The slope of the slope protection area is widened to form a slope surface.

[0006] S200, Lay an insulation layer on the slope.

[0007] S300. Pour sloping concrete on the insulation layer to cover it.

[0008] The thickness of the slope concrete is greater than the thickness of the insulation layer.

[0009] In one possible implementation, combining the above technical solutions, in S100, the slope surface is leveled and compacted according to the design elevation and slope.

[0010] In the S200, foam panels of the designed thickness are laid flat on the slope from bottom to top to form an insulation layer.

[0011] In S300, the slope concrete is poured from bottom to top.

[0012] In one possible implementation, based on the above technical solutions, in S200, the foam board is designed to be 5-20cm thick and is laid in a single layer.

[0013] In S300, the thickness of the slope concrete pouring is 10-20cm.

[0014] In one possible implementation, based on the above technical solutions, the step of pouring slope concrete in S300 includes: S320. Pour concrete at the top of the slope and embed pre-embedded parts in the concrete to fix the hoisting equipment.

[0015] S330. After the insulation layer is laid, the slope is divided into multiple pouring sections according to a preset length. These sections are further divided into first-order sections and second-order sections, which are alternately set up, i.e., the slope concrete is poured using a section-by-section pouring method. When pouring the first-order section, the hoisting equipment is fixed on the concrete at the top of the slope corresponding to the pouring section, and side forms are installed on both sides of the pouring section. The top edge of the side formwork is the same height as the surface layer height of the slope concrete. Then, the leveling and finishing equipment is suspended on the hoisting equipment, and the concrete is poured from bottom to top. Using the top edge of the side formwork as a ruler, the leveling and finishing equipment is used to level and finish the poured concrete. After the concrete in the first-order sections on both sides of the second-order section has reached its strength, the side formwork on the first-order section is removed, and the pouring of the second-order section begins. When pouring the second-order section, the hoisting equipment is fixed on the concrete at the top of the corresponding slope of the pouring section, and flexible strips are installed on both sides of the second-order section as structural joints. Then, the leveling and finishing equipment is suspended on the hoisting equipment, and the concrete is poured from bottom to top. The concrete surface of the first-order section on both sides of the pouring section is used as a benchmark, and the leveling and finishing equipment is used to level and finish the poured concrete.

[0016] In conjunction with the above technical solutions, in one possible implementation, the step of pouring slope concrete in S300 further includes: S310. Excavate a bottom protection ditch at the bottom of the slope, grout at the bottom of the bottom protection ditch to form an underground curtain, and then build an underground continuous wall inside the bottom protection ditch.

[0017] In S330, the sloping concrete covers the diaphragm wall.

[0018] In conjunction with the above technical solutions, in one possible implementation, S100 further includes the following steps: After leveling the slope, dry the surface layer, then spread a 0.5-3cm thick layer of fly ash on the slope, followed by a 0.1-1cm thick layer of cement powder mixed with a retarder, and finally a layer of steel fiber on top of the cement powder.

[0019] In S200, the insulation layer is laid from bottom to top on the cement powder sprinkled with steel fibers. The insulation layer uses composite foam board, which includes a rigid foam board layer and a flexible foam board layer. The flexible foam board layer is pasted and fixed on the side of the rigid foam board layer facing the slope. The thickness of the flexible foam board layer does not exceed 1cm.

[0020] In S330, a magnet assembly and a thermocouple assembly are installed on the leveling and finishing equipment and kept in the open state when pouring slope concrete.

[0021] The beneficial effects of the frost heave prevention construction technology for thin-walled concrete slope protection provided by the present invention are as follows: Compared with the prior art, the present invention can prevent the soil under the slope from freezing and heaving in winter by adding an insulation layer to the lower part of the concrete slope, thereby ensuring uniform stress on the concrete slope and avoiding or reducing the damage of freeze-thaw action to the river slope. Attached Figure Description

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of the riverbank after the construction of the thin-walled concrete slope protection anti-frost heave construction process provided in the embodiment of the present invention; Figure 2 This is a schematic diagram of the construction process of the thin-walled concrete slope protection and frost heave prevention construction technology for channels provided in an embodiment of the present invention.

[0024] The labels for the attached figures are as follows: 11. Slope surface; 12. Insulation layer; 13. Slope surface concrete; 14. Slope top concrete; 15. Bottom protection ditch; 16. Underground curtain wall; 17. Diaphragm wall; 20. Winching equipment; 30. Leveling and finishing equipment. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0027] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0031] The construction process for preventing frost heave in thin-walled concrete slope protection of channels provided by this invention will now be described.

[0032] In water conservancy projects, canals and slope protection are important applications of thin-walled concrete. Its core value lies in achieving multiple functions such as seepage prevention, reinforcement, and ecological protection through a "lightweight and efficient" structural design. During the construction of canals and slope protection, thin-walled concrete linings are used for canal seepage prevention and slope reinforcement, with a thickness typically ranging from 10 to 20 cm.

[0033] Thin-walled concrete on canal slopes typically needs to be cut into small, independent blocks to prevent the spread of defects. The cutting process must balance impermeability and slope stability, with block dimensions of 1m x 1.2m.

[0034] However, because the soil below the phreatic line in the lower part of the slope is saturated with water, meaning the soil pores are filled with water, when the temperature drops below zero, the river surface freezes. The temperature of the soil below the phreatic line also gradually decreases below zero due to heat transfer, causing significant frost heave in the soil below the phreatic line. The soil above the phreatic line, with its lower water content, experiences less frost heave, resulting in uneven support from the slope soil. This can even create cavities in the middle of the slope. Furthermore, repeated freeze-thaw cycles reduce the slope's strength. Combined with the weight of the slope material and the pressure from floating ice, this leads to a surge in localized stress. Over a long period, this process causes cracks and deformation in the riverbank slope, and in severe cases, large sections of the slope can slide into the river, gradually losing its protective function for the soil.

[0035] Therefore, a construction process for preventing frost heave in thin-walled concrete slope protection of channels is proposed to solve the technical problem of easy damage to river slope protection under freeze-thaw action.

[0036] like Figure 1 and Figure 2 As shown, the frost heave prevention construction process for thin-walled concrete slope protection of channels provided by the present invention includes the following steps: S100, The slope of the slope protection area is widened to form slope surface 11.

[0037] S200, Lay an insulation layer 12 on the slope 11.

[0038] S300. Pour slope concrete 13 on the insulation layer 12 to cover the insulation layer.

[0039] Among them, the thickness of the slope concrete 13 is greater than the thickness of the insulation layer.

[0040] The frost heave prevention construction process for thin-walled concrete slope protection provided in this embodiment, compared with the prior art, can prevent the soil at the bottom of the slope protection from freezing and heaving in winter by adding an insulation layer to the bottom of the slope concrete 13, thereby ensuring uniform stress on the slope concrete 13 and avoiding or reducing the damage to the river slope protection caused by freeze-thaw action.

[0041] like Figures 1 to 2 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows: S100. The slope protection area is sloped to form slope surface 11. Specifically, slope surface 11 is leveled and compacted according to the design elevation and slope. After leveling slope surface 11, the surface of slope surface 11 is dried. Then, a layer of fly ash with a thickness of 0.5-3cm is spread on the slope surface to absorb some moisture and prevent cement powder from setting too quickly. Next, a layer of cement powder with added retarder with a thickness of 0.1-1cm is spread on the fly ash as a cementing material to solidify after absorbing moisture. Finally, a layer of steel fibers is spread on the cement powder. The steel fibers are made of ferromagnetic materials with high iron content.

[0042] S200. Lay an insulation layer 12 on the slope 11. Specifically, foam boards with a designed thickness of 5-20cm are laid in single layers from bottom to top on cement powder sprinkled with steel fibers. The insulation layer is a composite foam board, which includes a rigid foam board layer and a flexible foam board layer. The flexible foam board layer is adhered and fixed to the side of the rigid foam board layer facing the slope 11, wherein the thickness of the flexible foam board layer does not exceed 1cm. In one specific embodiment, the rigid foam board layer is made of polystyrene foam board, and the flexible foam board layer is made of low-density polyethylene foam board.

[0043] S300. Pour slope concrete 13 on the insulation layer 12 to cover the insulation layer. The thickness of the slope concrete 13 is 10-20cm. The thickness of the slope concrete 13 is greater than that of the insulation layer. This standard is obtained through calculation and is highly operable. It not only ensures that the entire structure of concrete 13 can resist buoyancy when the main part of the slope is completely submerged in water, avoiding floating damage, but also facilitates quality control during construction.

[0044] Specifically, in S300, the steps for pouring the slope concrete 13 include: S310. Excavate a bottom protection ditch 15 at the bottom of the slope 11, and grout at the bottom of the bottom protection ditch 15 to form an underground curtain 16. Then, construct an underground continuous wall 17 inside the bottom protection ditch 15.

[0045] S320. Pour slope top concrete 14 at the top of slope 11 and embed pre-embedded parts in the slope top concrete 14 to fix the hoisting equipment 20.

[0046] S330. After the insulation layer 12 is laid, the slope is divided into multiple pouring sections according to a preset length. These multiple pouring sections are further divided into first-order sections and second-order sections, which are set alternately. That is, the slope concrete 13 is poured using a section-by-section pouring method. When pouring the first-order section, the hoisting equipment 20 is fixed on the top concrete 14 of the slope corresponding to the pouring section, and side forms are installed on both sides of the pouring section. The top edge of the side form is the same height as the surface layer height of the slope concrete 13. Then, the leveling and finishing equipment 30 is suspended on the hoisting equipment 20, and the concrete is poured from bottom to top. The top edge of the side form is used as a ruler, and the leveling and finishing equipment 30 is used to level and finish the poured concrete. After the concrete in the first-order sections on both sides of the second-order section has reached its strength, the side formwork on the first-order section is removed, and the pouring of the second-order section begins. When pouring the second-order section, the hoisting equipment 20 is fixed on the concrete 14 at the top of the slope corresponding to the pouring section, and flexible strips are installed on both sides of the second-order section as structural joints. Then, the leveling and finishing equipment 30 is suspended on the hoisting equipment 20, and the concrete is poured from bottom to top. The concrete surface of the first-order section on both sides of the pouring section is used as a benchmark, and the leveling and finishing equipment 30 is used to level and finish the poured concrete.

[0047] During the pouring of each pouring section, the slope concrete 13 covers the underground continuous wall 17. The slope concrete 13 and the underground continuous wall 17 form a fixed connection after being bonded by concrete or reinforced by rebar installation.

[0048] The installation of the underground curtain wall 16 and the underground continuous wall 17 can not only prevent the downward sliding of the slope concrete 13 and the insulation layer 12, but also reduce the possibility of water carrying away soil and hollowing out the lower part of the insulation layer 12. At the same time, it can also increase the weight of the bottom of the slope concrete 13 and prevent the bottom of the slope concrete 13 from floating.

[0049] Among them, a magnet assembly and a thermocouple assembly are installed on the leveling and smoothing equipment 30, and are kept in the open state when pouring the slope concrete 13.

[0050] Specifically, the leveling and finishing equipment 30 includes a leveling plate, multiple vibrating claws, a vibrator, a magnet assembly and a thermocouple assembly, a finishing panel, and a vibrator. The leveling plate is connected to the winch 20 via a steel cable. Both the leveling plate and the finishing panel are rigid structures, with both ends used to rest on the concrete surface of the side formwork or the first-order section on both sides of the pouring area. The finishing panel is located behind the leveling plate and connected to it via a suspension line. The side of the finishing panel facing the concrete is smooth. The vibrator is mounted on the leveling plate to drive it to vibrate. Multiple vibrating claws are evenly distributed at the front end of the leveling plate to penetrate into the concrete and vibrate it. The magnet assembly and thermocouple assembly are located inside the vibrating claws. The vibrator is mounted on the finishing panel to drive it to vibrate left and right, achieving a rough finishing effect.

[0051] During concrete pouring, as the concrete is poured into the formwork, the leveling and finishing equipment 30 moves slowly upward under the drive of the winch 20. The leveling plate acts as the top formwork for the concrete, leveling and shaping the top surface. Under the attraction of the magnetic components, the heating of the thermocouple components, and the vibration of the leveling plate and vibrating claws, the steel fibers at the bottom of the insulation layer 12 vibrate, stand upright in the magnetic direction, and generate heat. On the one hand, this melts part of the flexible foam board layer of the insulation layer 12 and adheres to it. On the other hand, the arrangement of the steel fibers in the cement powder becomes disordered. As groundwater rises, the cement powder, fly ash, and steel fibers form a hard shell structure attached to the bottom of the insulation layer 12. This prevents the insulation layer 12 from sliding downward and protects the lower surface of the insulation layer 12 from damage by animal or plant roots.

[0052] Based on the above embodiments, pipe-type drainage valves can also be installed within the slope protection structure or at the toe of the slope. These pipe-type drainage valves are made of PVC, HDPE, or metal pipes, with permeable holes in the pipe wall and an outer filter layer. These valves are used for deep drainage of soil and concrete slope protection structures to further reduce the impact of soil moisture on the frost heave of the slope protection concrete.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction process for preventing frost heave in thin-walled concrete slope protection of channels, characterized in that, include: S100. The slope protection area is sloped to form a slope surface; S200. Lay an insulation layer on the slope. S300. Pour slope concrete on the insulation layer to cover the insulation layer; The thickness of the slope concrete is greater than the thickness of the insulation layer.

2. The construction process for preventing frost heave in thin-walled concrete slope protection of channels as described in claim 1, characterized in that: In S100, the slope surface is leveled and compacted according to the design elevation and slope. In S200, foam panels of the designed thickness are laid flat on the slope from bottom to top to form an insulation layer; In S300, the slope concrete is poured from bottom to top.

3. The construction process for preventing frost heave in thin-walled concrete slope protection of channels as described in claim 2, characterized in that: In S200, the foam board is designed to be 5-20cm thick and is laid in a single layer. In S300, the thickness of the slope concrete pouring is 10-20cm.

4. The construction process for preventing frost heave in thin-walled concrete slope protection of channels as described in claim 1, characterized in that, In S300, the step of pouring the slope concrete includes: S320. Pour slope top concrete at the top of the slope and embed pre-embedded parts in the slope top concrete to fix the hoisting equipment. S330. The slope after the insulation layer is laid is divided into multiple pouring sections according to a preset length. These sections are further divided into first-order sections and second-order sections, which are alternately arranged, i.e., the slope concrete is poured using a staggered pouring method. When pouring the first-order section, the hoisting equipment is fixed to the top concrete of the corresponding slope section, and side forms are installed on both sides of the section. The top edge of the side forms is the same height as the surface layer height of the slope concrete. Then, the leveling and finishing equipment is suspended from the hoisting equipment, and concrete is poured from bottom to top, using the top edge of the side forms as a guide. The leveling and finishing equipment is used to level and finish the poured concrete. After the concrete in the first-order section on both sides of the second-order section has reached its strength, the side formwork on the first-order section is removed, and the pouring of the second-order section begins. When pouring the second-order section, the hoisting equipment is fixed on the concrete at the top of the slope corresponding to the pouring section, and flexible strips are installed on both sides of the second-order section as structural joints. Then, the leveling and finishing equipment is suspended on the hoisting equipment, and concrete is poured from bottom to top. The concrete surface of the first-order section on both sides of the pouring section is used as a benchmark, and the leveling and finishing equipment is used to level and finish the poured concrete.

5. The construction process for preventing frost heave in thin-walled concrete slope protection of channels as described in claim 4, characterized in that, In S300, the step of pouring the slope concrete further includes: S310. Excavate a bottom protection ditch at the bottom of the slope, grout at the bottom of the bottom protection ditch to form an underground curtain, and then build an underground continuous wall in the bottom protection ditch. In S330, the slope concrete covers the diaphragm wall.

6. The construction process for preventing frost heave in thin-walled concrete slope protection of channels as described in claim 4, characterized in that: S100 also includes the following steps: After leveling the slope, the surface of the slope is dried, and then a layer of fly ash with a thickness of 0.5-3cm is spread on the slope. Then, a layer of cement powder with retarder with a thickness of 0.1-1cm is spread on the fly ash, and then a layer of steel fiber is spread on the cement powder. In S200, the insulation layer is laid from bottom to top on cement powder sprinkled with steel fibers. The insulation layer is made of composite foam board, which includes a rigid foam board layer and a flexible foam board layer. The flexible foam board layer is pasted and fixed to the side of the rigid foam board layer facing the slope. The thickness of the flexible foam board layer does not exceed 1 cm. In S330, a magnet assembly and a thermocouple assembly are installed on the leveling and finishing equipment and are kept in the open state when the slope concrete is poured.

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