Channel slope protection and anti-scour construction technology and structure

Abstract

The present invention provides a channel slope protection and anti-scour construction process and structure, belonging to the field of water conservancy engineering technology. The channel slope protection and anti-scour construction process includes the following steps: First, a geotextile is laid on the slope surface. When the geobags are filled with soil, half a bag of soil is filled into the geobag and then tied. The geobags are then laid on the geotextile in rows along the cross-sectional direction of the diversion channel, with the bag opening facing upstream and the two corners of the bag bottom pressing against the two adjacent geobags in the next row, forming a fish-scale arrangement. Construction workers insert the two rods of a U-shaped clamp into the adjacent corners of the bottom of adjacent geobags, pass through the corners to press the geobag in the next row, and then through the geotextile and into the soil on the slope surface. When water flows through, the geobags in the front row provide protection for the geobags in the back row, and the U-shaped clamp can enhance the anchoring of the geobags, preventing them from being washed away by water, thereby improving their resistance to water erosion.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy projects, and more specifically, relates to a channel slope protection and anti-scouring construction process and structure. Background Art

[0002] Diversion channels are common structures in water conservancy projects, primarily serving to temporarily guide water flow. In areas with high water volumes, due to water erosion and overly soft soil, diversion channel slope protection is difficult to withstand and prone to deformation and collapse when ditches are directly excavated as diversion channels. As diversion channels are temporary structures, reinforcing the slopes with masonry or concrete structures is wasteful. Therefore, geobags are commonly used in existing technologies to reinforce diversion channel slopes. This involves stacking a layer of soil-filled geobags on the slopes to resist water erosion.

[0003] However, this method is still unable to resist water erosion when the water level rises sharply in the rainy season and at the bends of the diversion channel. Once the geobags in one area are washed away, the flowing water will quickly erode the slope protection, hollowing out the surrounding soil, causing damage to the slope protection in a larger area. Summary of the Invention

[0004] The purpose of the present invention is to provide a channel slope protection and anti-scouring construction process and structure to solve the technical problems in the existing technology that the current method of using geobags to reinforce the diversion channel slope protection is still difficult to resist water erosion when the water level rises sharply in the rainy season and the diversion channel bends.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a channel slope protection and anti-scour construction process, comprising the following steps:

[0007] S100: Slope cutting: excavate the slope surface according to the designed slope, and level and compact it.

[0008] S200, laying geotextiles: laying a layer of geotextiles on the slope surface, and overlapping or connecting adjacent geotextiles together.

[0009] S300, scale-like laying of geobags: fill half a bag of soil into the geobag and tie a knot. Lay the geobags on the geotextile in rows along the cross-section of the diversion channel, with the opening of each geobag facing upstream. The two corners of the bottom of the bag are pressed on the two adjacent geobags in the next row to form a fish-scale arrangement.

[0010] S400, flatten the geobags and use rolling equipment to flatten the laid geobags.

[0011] S500. Fix with a U-shaped clip. The U-shaped clip includes a connecting portion and two insertion rods. Each of the two insertion rods has a pointed end and the other end is fixedly connected to the connecting portion. The two insertion rods of the U-shaped clip are respectively inserted into the adjacent corners of the bottom of adjacent geobags, and then pass through the geobags in the next row pressed by the corners, and then pass through the geotextile and insert into the soil on the slope. A U-shaped clip is inserted into each corner of the bottom of the geobag, so that the geobags arranged in a fish-scale pattern form a mesh connection.

[0012] In combination with the above technical solution, in a possible implementation, the relationship between the length h of the insertion rod and the maximum design flow velocity v of the diversion channel is h=kv, where k is a constant determined by calculation or experiment.

[0013] In combination with the above technical solution, in a possible implementation, the insertion rod of the U-shaped card is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps:

[0014] S600, grouting consolidation. Grouting is injected into the soil of the slope surface by inserting rods to form a grouting consolidation body to improve the anchoring performance of the U-shaped clip.

[0015] In combination with the above technical solution, in a possible implementation, the insertion rod of the U-shaped card is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps:

[0016] S700, elastic anchoring. An elastic anchor that is longer than the rod is inserted into the rod. The elastic anchor is an elastic insert and is naturally curved. The front end is provided with inverted teeth and the rear end is provided with a clamping head for clamping onto the outside of the rod.

[0017] In combination with the above technical solution, in a possible implementation, the U-shaped card further includes a baffle, which is a bowl-shaped structure and is sleeved on the insertion rod.

[0018] In combination with the above technical solution, in a possible implementation,

[0019] Both geotextiles and geobags are made of plastic woven materials, and geobags have a double-layer structure.

[0020] In S200 , after laying the geotextile, iron powder is sprinkled on the geotextile.

[0021] In S400 , after the geobag is flattened, the iron powder is heated on the geobag using a thermocouple device, so that the geotextile and the geobag are partially welded together.

[0022] The beneficial effect of the channel slope protection and anti-scour construction process provided by the present invention is that: compared with the existing technology, the present invention fixes the geobags arranged in a fish-scale shape through U-shaped clips to form a flat mesh structure. When water flows through, the geobags in the front row form protection for the geobags in the rear row, and the U-shaped clips can enhance the anchoring of the geobags, preventing the geobags from being washed away by water, thereby enhancing the resistance to water erosion, and the construction is convenient and the construction cost is relatively low.

[0023] In a second aspect, the present invention provides a channel slope protection and anti-scour structure comprising a plurality of geobags, a geotextile, and a plurality of U-shaped clips. The geobags are used to hold soil. The geotextile is laid between the slope and the geobags. The U-shaped clips comprise a connecting portion and two insertion rods, which are arranged parallel to each other at either end of the connecting portion. One end of each insertion rod has a pointed tip, and the other end of each insertion rod is fixedly connected to the connecting portion.

[0024] The two insertion rods are respectively inserted into the adjacent corners of the bottom of the adjacent geobags, pass through the geobag in the next row pressed by the corners, pass through the geotextile, and are inserted into the soil on the slope.

[0025] The channel slope protection and anti-scour structure provided by the present invention has the following beneficial effects: Compared with the prior art, the slope protection structure includes a geotextile, multiple geobags, and multiple U-shaped clips. First, the geotextile is laid on the slope surface. When the geobags are filled with soil, they are half-filled with soil and tied. The geobags are then laid on the geotextile in rows along the cross-section of the diversion channel, with the opening of each geobag facing upstream and the two corners of the bag bottom pressed against two adjacent geobags in the next row, forming a fish-scale arrangement.

[0026] The construction workers insert the two rods of the U-shaped card into the adjacent corners of the bottom of the adjacent geobags, and then pass through the geobags in the next row pressed by the corners, and then through the geotextile, and insert into the soil of the slope. A U-shaped card is inserted into the two corners of the bottom of the geobag, so that the geobags arranged in a fish scale shape form a mesh connection structure. When water flows through, the geobags in the front row form a protection for the geobags in the back row, and the U-shaped card can improve the anchoring of the geobags, preventing the geobags from being washed away by water, thereby improving the resistance to water erosion. In addition, the construction is convenient and the construction cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A schematic diagram of a process flow for a channel slope protection and anti-scour construction process according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the installation of a channel slope protection and anti-scour structure provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of U-shaped clips and geobags in the channel slope protection and anti-scour structure provided by an embodiment of the present invention.

[0031] Among them, the reference numerals in the figures are as follows:

[0032] 10. Slope; 30. Geobag;

[0033] 40. U-shaped card; 41. Insertion rod; 42. Connecting part; 43. Stop plate;

[0034] 50. Grouting consolidation body; 60. Elastic reinforcement. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the described embodiments are only part of the embodiments of this application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0037] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] The directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. The terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate the directions or positional relationships based on the directions or positional relationships 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 direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below 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 spatially relative descriptions used herein are interpreted accordingly.

[0040] 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 quantity of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0041] The channel slope protection and anti-scour construction process and structure provided by the present invention are now described.

[0042] First, as Figure 1 As shown, the channel slope protection and anti-scour construction process provided by the present invention includes the following steps:

[0043] S100, slope cutting, excavate the slope surface 10 according to the designed slope, and level and compact it.

[0044] S200 , laying geotextiles: laying a layer of geotextiles on the slope surface 10 , with adjacent geotextiles stacked or connected together.

[0045] S300, spread the geobags 30 in a scale-like pattern. Fill half a bag of soil into the geobag 30 and tie a knot. Lay the geobags 30 on the geotextile in rows along the cross-section of the diversion channel, with the opening of each geobag 30 facing upstream. The two corners of the bottom of the bag are pressed on the two adjacent geobags 30 in the next row, forming a fish-scale arrangement.

[0046] S400, flattening the geobags 30, using a rolling device to flatten the laid geobags 30.

[0047] S500 , fixing the U-shaped card 40 : The U-shaped card 40 includes a connecting portion 42 and two inserting rods 41 . The two inserting rods 41 are each provided with a pointed tip at one end and are fixedly connected to the connecting portion 42 at the other end.

[0048] The two insertion rods 41 of the U-shaped card 40 are respectively inserted into the adjacent corners of the bottom of the adjacent geobags 30, and pass through the geobag 30 in the next row pressed by the corner, and pass through the geotextile and insert into the soil of the slope 10. A U-shaped card 40 is inserted into the two corners of the bottom of the geobag 30, so that the geobags 30 arranged in a fish-scale shape form a mesh connection.

[0049] Compared with the prior art, the channel slope protection and anti-scour construction process provided in this embodiment uses U-shaped clips 40 to fix the geobags 30 arranged in a fish-scale pattern to form a flat mesh structure. When water flows through, the geobags 30 in the front row form protection for the geobags 30 in the rear row, and the U-shaped clips 40 can improve the anchoring of the geobags 30, preventing the geobags 30 from being washed away by water, thereby improving the resistance to water erosion. In addition, the construction is convenient and the construction cost is relatively low.

[0050] like Figures 1 to 3 As shown, the present invention provides a specific implementation method based on the above embodiment as follows:

[0051] The relationship between the length h of the insertion rod 41 and the maximum design flow velocity v of the diversion channel is h=kv, where k is a constant determined by calculation or experiment.

[0052] one, k Theoretical calculation logic of value

[0053] Mechanical equilibrium model

[0054] The length of the rod 41 must meet the anchoring requirements of the geobag 30 to resist the force of water flow. The key is to balance the drag force of the water flow on the geobag 30 and the anchoring force of the rod 41 in the soil:

[0055] Water drag force: Fd =21 Cdρv 2 A ,in Cd is the drag coefficient (related to the shape of the geobag 30 and the flow pattern), ρ is the density of water, A It is the water-facing area of geobag 30.

[0056] Rod anchoring force: ,in μ is the friction coefficient between the rod 41 and the soil, γ is the soil bulk density, L is the circumference of the insertion rod 41 (related to the diameter of the insertion rod 41).

[0057] when Fa ≥ Fd When , the combined simplification can be obtained h ∝ v 2. However, in actual engineering, in order to simplify the calculation, the relationship is often approximated as a linear h = kv ,at this time k It can be regarded as a comprehensive constant including drag coefficient, soil parameters, safety factor, etc.

[0058] 2. Impact k Key parameters of value

[0059]

[0060] Note: During the construction of the Xian County diversion channel, the soil parameters, the water-facing area of the geobag 30, the water density, the soil bulk density, and the friction coefficient between the rod 41 and the soil are all fixed values (i.e., fixed values).

[0061] 3. Refer to the empirical values of anchor structures in the "Code for Slope Design of Water Conservancy and Hydropower Projects":

[0062] For sand slope: when the flow velocity v =1~3m / s, k Usually between 0.2 and 0.5 (unit: m*s / m);

[0063] For clay slopes: Due to the large friction of the soil, k It can be reduced to 0.1~0.3.

[0064] Since the slope protection in the Xian County diversion channel project is clay slope, k The range of 0.1~0.3 is adopted. In the actual construction process, safety redundancy is considered. k The value used is 0.1.

[0065] In a specific embodiment, the insertion rod 41 of the U-shaped card 40 is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps:

[0066] S600 , grouting consolidation: Grouting is injected into the soil of the slope surface 10 through the insertion rod 41 to form a grouting consolidation body 50 to improve the anchoring performance of the U-shaped clip 40 .

[0067] In the actual grouting process, since different soil types have different requirements for grouting, the following are some parameter controls during the grouting construction process:

[0068] 1. Grouting construction control parameters

[0069] 1. Grouting sequence

[0070] Slope from bottom to top: first inject into the downstream hole, then inject into the upstream hole to prevent the slurry from being washed away by water (such as river slope protection grouting is constructed row by row from the foot of the slope to the top of the slope).

[0071] Interval skipping holes: The interval between grouting adjacent holes should be ≥24h to avoid grouting in the form of a plum blossom (grout the odd-numbered holes first, then the even-numbered holes).

[0072] 2. Termination criteria

[0073] Pressure control: Grouting can be terminated when the grouting pressure reaches the design value and is maintained for 10 minutes and the grouting volume is less than 1L / min.

[0074] Grouting volume control: When the single-hole grouting volume reaches more than 1.5 times the theoretical value and there is no obvious increase in pressure, it is necessary to check whether there is leakage (quick-setting slurry can be used for sealing).

[0075] 2. Parameter adjustment under special geological conditions

[0076]

[0077] 3. Grouting quality test parameters

[0078] Compressive strength: The 28-day compressive strength of the grouting body is ≥15MPa (for reinforcement) or ≥10MPa (for anti-seepage), and the pass rate of core sampling test is ≥85%.

[0079] Permeability coefficient: soil permeability coefficient after anti-seepage grouting ≤ 1×10 -7 cm / s, and is tested by water pressure test (leakage volume is less than 5L / min when the pressure is 0.3MPa).

[0080] Slope displacement: After grouting, the horizontal displacement of the slope is ≤5mm / month, and the vertical displacement is ≤3mm / month (monitored by total station).

[0081] In another specific embodiment, the insertion rod 41 of the U-shaped card 40 is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps:

[0082] S700, anchoring with elastic rib 60: insert elastic rib 60 which is longer than the insertion rod 41 into the insertion rod 41 , wherein the elastic rib 60 is an elastic insertion rib structure and is curved in a natural state, with inverted teeth at the front end and a clamping head at the rear end for clamping on the outside of the insertion rod 41 .

[0083] In actual use, S600 or S700 can be used alone according to needs, or S600 and S700 can be used at the same time.

[0084] Specifically, the length of the elastic tendon 60 is 20 cm to 40 cm.

[0085] The U-shaped card 40 also includes a baffle 43, which is a bowl-shaped structure and is sleeved on the insertion rod 41 to be buckled on the geobag 30 to prevent the punctured part of the geobag 30 from leaking soil under the scouring of water.

[0086] The geotextile and the geobag 30 are both made of plastic woven materials, and the geobag 30 has a double-layer structure.

[0087] In S200 , after laying the geotextile, iron powder is sprinkled on the geotextile.

[0088] In S400 , after the geobag 30 is flattened, the iron powder is heated on the geobag 30 using a thermocouple device, so that the geotextile and the geobag 30 are partially fused together.

[0089] Second, see Figure 2 and Figure 3 The present invention also provides a channel slope protection and anti-scour structure, which includes a geotextile, a plurality of geobags 30, and a plurality of U-shaped clips 40. The plurality of geobags 30 are used to hold soil. The geotextile is laid between the slope surface 10 and the geobags 30.

[0090] The plurality of U-shaped clips 40 include a connecting portion 42 and two inserting rods 41. The two inserting rods 41 are arranged in parallel at both ends of the connecting portion 42, one end of the inserting rod 41 is provided with a pointed tip, and the other end of the inserting rod 41 is fixedly connected to the connecting portion 42.

[0091] The two insertion rods 41 are respectively inserted into the adjacent corners of the bottom of the adjacent geobags 30 , pass through the geobag 30 in the next row pressed by the corners, pass through the geotextile, and are inserted into the soil of the slope 10 .

[0092] Combine Figure 2 and Figure 3 As shown, first, a geotextile is laid on the slope 10. When the geobags 30 are filled with soil, half a bag of soil is filled into the geobag 30 and then tied. The geobags 30 are then laid on the geotextile in rows along the cross-section of the diversion channel, with the opening of each geobag 30 facing upstream and the two corners of the bottom of the bag pressed against the two adjacent geobags 30 in the next row, forming a fish-scale arrangement.

[0093] Secondly, the geobags 30 are fixed to the slope 10 using U-shaped clips 40. Construction workers insert the two insertion rods 41 of the U-shaped clips 40 into the adjacent corners of the bottom of adjacent geobags 30, pass through the corners to press down the next row of geobags 30, and then pass through the geotextile to insert into the soil of the slope 10. A U-shaped clip 40 is inserted into each corner of the bottom of the geobag 30, so that the geobags 30 arranged in a fish-scale pattern form a network connection structure.

[0094] Compared with the prior art, the present invention uses U-shaped clips 40 to fix the geobags 30 arranged in a fish-scale pattern to form a flat mesh structure. When water flows through, the geobags 30 in the front row provide protection for the geobags 30 in the rear row, and the U-shaped clips 40 can enhance the anchoring of the geobags 30, preventing the geobags 30 from being washed away by water, thereby enhancing the resistance to water erosion. In addition, the construction is convenient and the construction cost is relatively low.

[0095] The above are only 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 in the scope of protection of the present invention.

Claims

1. A channel slope protection and anti-scour construction process, characterized in that: The following steps are involved: S100, slope cutting, excavating the slope surface according to the designed slope, and leveling and compacting; S200, laying geotextiles: laying a layer of geotextiles on the slope surface, with adjacent geotextiles overlapping or connecting together; S300, scaly laying geobags: half a bag of soil is filled into the geobag and then tied. The geobags are laid on the geotextile in rows along the cross-section of the diversion channel, with the opening of each geobag facing upstream and the two corners of the bottom of the bag pressed on the two adjacent geobags in the next row, forming a fish-scale arrangement; S400, geobag flattening, use rolling equipment to flatten the laid geobags; S500, fix the U-shaped card; the U-shaped card includes a connecting part and two insertion rods, each of the two insertion rods is provided with a pointed head at one end, and the other end of the insertion rod is fixedly connected to the connecting part; the two insertion rods of the U-shaped card are respectively inserted into the adjacent corners of the bottom of the adjacent geobags, and pass through the geobags in the next row pressed by the corners, and pass through the geotextile and insert into the soil on the slope, and a U-shaped card is inserted into the two corners of the bottom of the geobag, so that the geobags arranged in a fish-scale shape form a mesh connection.

2. The channel slope protection and anti-scouring construction process according to claim 1, characterized in that: The relationship between the length h of the plunger and the maximum design flow velocity v of the diversion channel is h=kv, where k is a constant determined by calculation or experiment.

3. The channel slope protection and anti-scouring construction process according to claim 1 is characterized in that: The insertion rod of the U-shaped card is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps: S600, grouting consolidation: grouting is injected into the soil of the slope surface through the insertion rod to form a grouting consolidation body to improve the anchoring property of the U-shaped clip.

4. The channel slope protection and anti-scouring construction process according to claim 1, characterized in that: The insertion rod of the U-shaped card is a hollow tubular structure, and the channel slope protection and anti-scour construction process further includes the following steps: S700, elastic tendon anchoring; insert an elastic tendon longer than the insertion rod into the insertion rod; wherein the elastic tendon is an elastic insertion rod structure and is curved in a natural state, and the front end of the elastic tendon is provided with a reverse tooth and the rear end is provided with a clamping head for clamping to the outside of the insertion rod.

5. The channel slope protection and anti-scour construction process according to claim 1, characterized in that: The U-shaped card further comprises a baffle, which is a bowl-shaped structure and is sleeved on the insertion rod.

6. The channel slope protection and anti-scour construction process according to claim 1, characterized in that: The geotextile and the geobag are both made of plastic woven materials, and the geobag has a double-layer structure; In S200, after laying the geotextile, iron powder is sprinkled on the geotextile; In S400 , after the geobag is flattened, the iron powder is heated on the geobag using a thermocouple device, so that the geotextile and the geobag are partially welded together.

7. A channel slope protection and anti-scour structure, characterized in that: include: Multiple geobags to hold soil; Geotextile, laid between the slope surface and geobags; A plurality of U-shaped clips, comprising a connecting portion and two insertion rods, wherein the two insertion rods are arranged in parallel at both ends of the connecting portion, one end of the insertion rod is provided with a pointed head, and the other end of the insertion rod is fixedly connected to the connecting portion; The two insertion rods are respectively inserted into the adjacent corners of the bottom of the adjacent geobags, pass through the geobag in the next row pressed by the corners, pass through the geotextile, and are inserted into the soil on the slope.

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