Construction method of composite protection system for water-rich sandy loam slope

Abstract

The invention provides a construction method of a composite protection system for a water-rich sandy loam slope, which comprises the following steps of: S1, excavation and backfilling of flow guide blind ditches: excavating one flow guide blind ditch on the surface of the slope at an interval of N1 meters, backfilling the flow guide blind ditches and then arching; s2, construction of a side slope protection grid: digging a groove after arching to form longitudinal grid ridges and transverse grid ridges of the protection grid so as to form the side slope protection grid; s3, construction of chain type slope protection building blocks: after the slope protection grid is formed, the chain type slope protection building blocks are paved in units formed by separation of longitudinal grid stems and transverse grid stems of the protection grid; and S4, slope protection foot and drainage pipe construction: after the chain type slope protection building blocks are paved, the drainage pipe sleeves the flow guide blind ditch at the bottom of the slope, and the slope protection foot is arranged at the bottom of the slope and is nested in the drainage pipe. The problem of protection of the water-rich sandy loam slope can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering construction, and particularly relates to a composite protection system construction method for water-rich sandy loam slopes. Background Art

[0002] There are often sandy loam slopes on both sides of infrastructure such as roads and waterways. Water-rich sandy loam slopes are formed in areas with abundant precipitation or groundwater. In seasons with heavy rainfall or when disturbed, water-rich sandy loam slopes are prone to landslides, collapse, instability and soil erosion, causing damage to infrastructure such as roads and waterways. Therefore, it is necessary to protect the water-rich sandy loam slopes on both sides of facilities such as roads and waterways.

[0003] When protecting the slope, due to the high water content and soft soil of the water-rich sandy loam slope, it is difficult for workers and construction machinery to find an effective working surface on the slope, which is not conducive to slope reinforcement. At the same time, after the slope protection is completed, due to the different drainage rates at different locations, under the ballast of the slope protection paving blocks, the drainage and consolidation rates of the soil at different locations on the slope are different, resulting in uneven settlement, leading to poor slope protection paving effect. In addition, after the slope protection is completed, under the influence of precipitation and other factors, the sandy loam on the slope is soaked in water and has no organized drainage system, causing the surface soil of the slope to change the soil structure many times under the cycle of "immersion-saturation-drainage-consolidation", resulting in more serious uneven settlement, causing large areas of slope protection reinforcement blocks to be damaged, which is not conducive to the durability of the slope protection reinforcement blocks, and then affects the durability of the slope protection system, which is not conducive to the long-term stability of the slope.

[0004] Therefore, it is urgent to invent a composite protection system construction method for water-rich sandy loam slope to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a composite protection system construction method for water-rich sandy loam slope, the method comprising:

[0006] S1. Excavation and backfilling of diversion blind ditch: a diversion blind ditch is excavated at intervals of N1 meters on the slope surface, and the diversion blind ditch is backfilled and then arched;

[0007] S2. Construction of slope protection grid: dig trenches after arching to form longitudinal and transverse grid stems of the protection grid to form the slope protection grid;

[0008] S3. Construction of interlocking slope protection blocks: After forming the slope protection grid, interlocking slope protection blocks are laid in the units separated by the longitudinal grid stems and the transverse grid stems of the protection grid;

[0009] S4. Construction of slope protection footing and drainage pipes: After paving the interlocking slope protection blocks, a drainage pipe is used to cover the diversion blind ditch at the bottom of the slope, and a slope protection footing is arranged at the bottom of the slope and nested in the drainage pipe.

[0010] Furthermore, in step S1, backfilling specifically includes:

[0011] After the diversion blind ditch is excavated, a blind ditch sand cushion layer is laid at the bottom;

[0012] After the blind ditch sand cushion layer is laid, a blind ditch graded crushed stone layer is laid on the blind ditch sand cushion layer;

[0013] After the blind ditch graded gravel layer is laid, the remaining space in the diversion blind ditch is backfilled with compacted soil to close and level the diversion blind ditch.

[0014] Furthermore, in step S1, arching specifically includes:

[0015] With the longitudinal central axis of each diversion blind ditch as the center, clay with a specified moisture content is used to compact and lay along the longitudinal central axis of the diversion blind ditch to both sides at a reduced height according to the specified slope to complete the laying of the ultra-wide compacted covering soil.

[0016] Furthermore, in step S2, forming the longitudinal grid and the transverse grid of the protective grid specifically includes:

[0017] Taking the central axis between any two diversion blind ditches as the reference, a longitudinal groove with a depth of N3 cm and a width of N4 cm is excavated every N2 meters;

[0018] A stabilizing mechanism is installed based on the longitudinal groove to form a longitudinal grid stem;

[0019] Based on the preliminary longitudinal grid lines, dig transverse trenches with a depth of N3 cm and a width of N4 cm at intervals of N5 in the transverse direction;

[0020] Another stabilizing mechanism is installed based on the transverse groove to form a transverse grid;

[0021] An anti-slip anchor rod is inserted into the intersection of the protective grid perpendicular to the slope surface at the center of the square area formed by the intersection of the longitudinal grid and the transverse grid, and the length of the anti-slip anchor rod is sufficient to pass through the slip surface of the slope.

[0022] Furthermore, the first stabilizing mechanism is installed based on the longitudinal groove to form a longitudinal grid, which specifically includes:

[0023] A steel plate is used as the first side formwork, and is inserted into the longitudinal groove along the two side walls of the excavated longitudinal groove and close to the longitudinal groove as the side formwork of the longitudinal grid concrete;

[0024] The overlap positions of the first side formwork are staggered in the same direction;

[0025] A plurality of first limiting plates are arranged at intervals between each first side template;

[0026] The first diagonal brace of the first side formwork is fixed to the slope surface through a first diagonal brace anchor, the first diagonal brace anchor is anchored to the soil with an anchor rod, and a hook is set at the end exposed to the ground;

[0027] Among them, the first diagonal brace and the first diagonal brace anchor are arranged at a specified interval along the direction of the first side formwork.

[0028] Furthermore, the second stabilizing mechanism is installed based on the transverse groove to form a transverse grid, including:

[0029] Use steel plates as the second side formwork, insert them into the transverse grooves along the two side walls of the excavated transverse grooves and close to the transverse grooves as the side formwork of the transverse grid concrete;

[0030] The second side formwork, the overlap positions are placed staggered in the same direction;

[0031] A plurality of second limiting plates are arranged at intervals between each second side template;

[0032] The second diagonal brace of the second side formwork is fixed to the slope surface through a second diagonal brace anchor, the second diagonal brace anchor is anchored to the soil with an anchor rod, and a hook is set at the end exposed to the ground;

[0033] Among them, the second diagonal brace and the second diagonal brace anchor are arranged at a specified interval along the direction of the second side formwork.

[0034] Furthermore, in step S2, forming the longitudinal grid and the transverse grid of the protection grid specifically includes:

[0035] The first side template is chamfered and disconnected at the position where the second side template intersects with the first side template, so that the first side template and the second side template are spatially connected;

[0036] Apply concrete release agent to the inner wall of the first side formwork and the second side formwork, and then pour the longitudinal grid concrete, the transverse grid concrete and the top beam concrete at the same time;

[0037] After the maintenance is completed, the demolition work is carried out. After the demolition, the gap between the concrete and the slope soil is filled with backfill soil to make it dense.

[0038] Furthermore, in step S2, forming the longitudinal grid and the transverse grid of the protection grid specifically includes:

[0039] At the top of the slope, a capping beam is arranged along a direction perpendicular to the longitudinal grid and close to the end of the longitudinal grid; the capping beam and the longitudinal grid are integrally cast by concrete.

[0040] Further, in step S3, paving the interlocking slope protection blocks specifically includes:

[0041] Lay the geotextile filter layer close to the slope surface that has been stabilized by drainage and consolidation through the diversion blind ditch and the longitudinal and transverse grid surfaces of the protective grid;

[0042] After the geotextile filter layer is paved, the interlocking slope protection blocks are laid in the units separated by the longitudinal grid and the transverse grid of the protection grid. The paving order of the interlocking slope protection blocks is from top to bottom and from both sides to the middle. Among them, the interlocking slope protection blocks are precast concrete ballast blocks, which are interlocked with each other by wedging.

[0043] Further, in step S4, a drainage pipe is used to cover the diversion blind ditch at the bottom of the slope, and a slope protection footing is arranged at the bottom of the slope and nested in the drainage pipe, specifically including:

[0044] At the bottom of the slope, drainage pipes are used to collect the pore water discharged from soil consolidation from the diversion blind ditch terminal and discharge it in an organized manner;

[0045] Filling the drain pipe with gravel of the specified particle size grade and coarse sand of the second fineness modulus and the second average particle size in the second specified ratio; installing a dense steel wire mesh at the drain pipe terminal;

[0046] The drainage pipe is connected to the diversion blind ditch, and after the connection is completed, the soil is covered with a specified thickness and compacted, and the end of the drainage pipe is flush with the edge of the slope protection footing;

[0047] The slope protection footing is arranged at the bottom of the slope, with a designated part buried underground and the remaining part located above ground, with drainage pipes nested, and the top elevation consistent with the compacted cover elevation of the drainage pipes.

[0048] The beneficial effects of the present invention are:

[0049] The present invention provides a composite protection system construction method for water-rich sandy loam slopes, which adopts a composite slope protection system of "diversion blind ditch + protection grid + interlocking slope protection blocks", conducts organized drainage through diversion blind ditch, quickly consolidates the slope surface soil during construction, provides a working surface for slope protection reinforcement and paving construction, and divides large-area slope protection reinforcement paving blocks into small units through protection grids, thereby reducing the impact of uneven settlement on paving blocks. At the same time, the paving blocks adopt prefabricated interlocking slope protection blocks to strengthen the connection between paving blocks and increase the integrity of the protection and reinforcement system, which can effectively solve the protection problem of water-rich sandy loam slopes.

[0050] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0052] Figure 1 A schematic diagram of the plan layout of a slope diversion blind ditch according to an embodiment of the present invention is shown.

[0053] Figure 2 A cross-sectional schematic diagram of a diversion blind ditch according to an embodiment of the present invention is shown.

[0054] Figure 3 A schematic diagram of the plan layout of a slope protection grid according to an embodiment of the present invention is shown;

[0055] Figure 4 A schematic plan view of a first side template and a limiting plate according to an embodiment of the present invention is shown;

[0056] Figure 5 A cross-sectional schematic diagram of a first diagonal brace according to an embodiment of the present invention is shown;

[0057] Figure 6 A schematic cross-sectional view of an anti-sliding anchor rod at an intersection of a protection grid according to an embodiment of the present invention is shown;

[0058] Figure 7 A schematic plan view of a slope protection system according to an embodiment of the present invention is shown;

[0059] Figure 8 A schematic cross-sectional view of a slope protection footing and a drainage pipe according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] The present invention provides a composite protection system construction method for water-rich sandy loam slope, the method comprising:

[0062] S1. Excavation and backfilling of diversion blind ditch: a diversion blind ditch 1 is excavated at intervals of N1 meters on the slope surface, and the diversion blind ditch 1 is backfilled and then arched;

[0063] S2. Construction of the slope protection grid: after arching, trenches are excavated to form longitudinal grid stems 5 and transverse grid stems 6 of the protection grid to form the slope protection grid;

[0064] S3, construction of interlocking slope protection blocks: after forming the slope protection grid, interlocking slope protection blocks 10 are paved in the units separated by the longitudinal grid stems 5 and the transverse grid stems 6 of the protection grid;

[0065] S4. Construction of slope protection footing and drainage pipe: After laying the interlocking slope protection blocks 10, a drainage pipe 11 is used to cover the diversion blind ditch 1 at the bottom of the slope, and a slope protection footing 12 is arranged at the bottom of the slope and nested in the drainage pipe 11.

[0066] The present invention is described in detail below

[0067] 1. Excavation and backfilling of diversion blind ditch

[0068] In some embodiments of the present invention, in order to quickly consolidate the soil on the surface of the slope during construction, provide a construction surface for the slope reinforcement paving construction, and avoid uneven settlement of the slope paving system due to different drainage and consolidation rates of soil at different positions of the slope under the ballast of the interlocking slope protection blocks 10, thereby destroying the integrity of the slope protection system, and considering the drainage of the slope caused by precipitation during the later maintenance to ensure the long-term overall stability of the slope, a permanent and temporary combined diversion blind ditch (1) is used to organize the drainage structure, such as Figure 1 As shown, a diversion blind ditch 1 (exemplarily, the diversion blind ditch 1 has a depth of 60 cm and a width of 50 cm) is excavated every N1 (exemplarily, N1=3) meters on the slope surface to provide a sufficient channel for drainage.

[0069] After the blind diversion ditch is excavated, Figure 2As shown, a blind ditch sand cushion layer 2 is laid at the bottom, and the specific method is: coarse sand with a first specified fineness modulus (exemplarily, such as 3.7-3.1) and a first specified average particle size (exemplarily, such as 0.5 mm or more) and medium sand with a second specified fineness modulus (exemplarily, such as 3.0-2.3) and a second specified average particle size (exemplarily, such as 0.5-0.35 mm) are mixed according to a first specified ratio (exemplarily, such as 7:3), and laid at the bottom of the diversion blind ditch 1, with a thickness of 10 cm after compaction. The blind ditch sand cushion layer 2 serves as both the basic cushion layer of the diversion blind ditch and the drainage channel of the slope and the isolation layer to block the infiltration of the blind ditch water collection, providing a basis for efficient drainage of the slope.

[0070] After the blind ditch sand cushion layer 2 is laid, a blind ditch graded gravel layer 3 is laid on the blind ditch sand cushion layer 2; graded gravel with a specified particle size (for example, 1 to 30 mm) is laid on the blind ditch sand cushion layer, and the thickness after compaction is 45 cm. The blind ditch graded gravel layer 3 is the main drainage channel of the diversion blind ditch 1. Under the action of the head difference, the pore water in the 50 cm thick sandy loam layer on the slope surface continuously converges to the blind ditch graded gravel layer, and is discharged in the diversion blind ditch along the slope direction, which accelerates the drainage and consolidation rate of the water-rich sandy loam on the slope surface. At the same time, the organized artificial drainage channel makes the soil consolidate regularly, avoids uneven settlement, and provides a basis for the paving of the interlocking slope protection blocks 10.

[0071] After the blind ditch graded gravel layer 3 is laid, backfilling is performed. Specifically, the remaining space in the diversion blind ditch 1 is backfilled with blind ditch compaction covering soil 4, and clay with a first specified moisture content (exemplarily, such as 19% to 23%) is used for backfilling and compaction to ensure that a specified compaction degree (exemplarily, such as 90%) is reached. The blind ditch compaction covering soil 4 is used to close and level the diversion blind ditch 1.

[0072] After backfilling is completed, the diversion blind ditch 1 is arched. Figure 1 As shown, with the longitudinal central axis of each diversion blind ditch 1 as the center, the compacted covering soil 4.1 for arching is laid with a specified slope. Specifically, clay with a second specified moisture content (exemplarily, such as 19% to 23%) is used, and it is compacted and laid at a low height along the longitudinal central axis of the diversion blind ditch 1 to both sides according to the specified slope (exemplarily, a slope of 6%) to complete the laying of the compacted covering soil. When the interval of the diversion blind ditch 1 is 3m, the width of each compacted covering soil 4.1 is 1.5m. The compacted covering soil 4.1 plays the role of sealing and leveling the surface of the slope, reducing the later precipitation from infiltrating into the interior of the slope to cause soil erosion. At the same time, the compacted covering soil 4.1 arches with the longitudinal central axis of the diversion blind ditch 1 as the center, which can offset part of the uneven slope surface caused by the large consolidation settlement of the soil around the diversion blind ditch 1 due to the precipitation of the diversion blind ditch 1, and provide a basis for the subsequent uniform paving of the interlocking slope protection blocks 10.

[0073] 2. Construction of slope protection grid

[0074] In some embodiments of the present invention, Figure 3 As shown, the slope protection grid is composed of the longitudinal grid stems 5, the transverse grid stems 6, the top beam 7, and the anti-slip anchor rods 8. The slope protection grid divides the slope surface into units of specified specifications (for example, 6m*6m) through the longitudinal grid stems 5 and the transverse grid stems 6. The slope protection grid plays a role in slope protection under its own gravity ballast. At the same time, the slope is divided into units to reduce the mutual influence of the soil of each unit during drainage and consolidation, and the flatness of the slope is ensured to the greatest extent. The anti-slip anchor rods 8 at the intersection of the protection grid are then used to firmly fix the protection grid to the slope surface, further enhancing the overall reinforcement effect and stability of the slope protection system.

[0075] Therefore, after the blind ditch sand cushion layer 2, blind ditch graded gravel layer 3, and compacted cover soil 4.1 of the diversion blind ditch (1) are laid, the blind ditch is drained and the sandy loam on the slope surface is consolidated and stabilized. Figure 3 As shown, trench excavation is used for the construction of the longitudinal grid stem 5 and the transverse grid stem 6 of the protective grid, which specifically includes:

[0076] Taking the central axis between any two blind diversion ditches (1) as a reference, a longitudinal groove with a depth of N3 centimeters (exemplarily, N3=60 cm) and a width of N4 centimeters (30 cm) is excavated every N2 meters (exemplarily, N2=6 m).

[0077] Based on the longitudinal groove, a stabilizing mechanism is installed to form a longitudinal grid (5), which specifically includes: Figure 4 As shown, a steel plate with a height of N5 meters (exemplarily, N5=1) is used as the first side formwork 5.1, and is inserted into the soil N6 centimeters (exemplarily, N6=20) along the two side walls of the excavated longitudinal groove. A steel plate with an upward height of N7 centimeters (exemplarily, N7=80) is closely attached to the longitudinal groove as the side formwork of the longitudinal grid concrete 5.5.

[0078] The length of each section of the first side formwork 5.1 is N8 meters (exemplarily, N8=10), the overlapping positions are staggered in the same direction, and the overlapping length is N9 centimeters (exemplarily, N9=50), to ensure that there is no leakage when pouring the longitudinal grid concrete 5.5.

[0079] A plurality of first limit plates 5.2 are arranged at intervals between each first side formwork 5.1 (the limit plates 5.2 are formed by pouring concrete in sections), and a steel plate with a height of N10 meters (exemplarily, N10=1) and a width of N11 centimeters (exemplarily, N11=30) is vertically inserted into the slope at intervals of N12 meters (exemplarily, N12=3) in the first side formwork 5.1 by N13 centimeters (exemplarily, N13=20). The first side formwork 5.1 is divided into sections at intervals of N14 meters (exemplarily, N14=3) in the longitudinal direction, so as to prevent the concrete from flowing rapidly downward along the slope and causing concrete segregation when pouring the concrete 5.5 of the longitudinal grid. Figure 5 As shown, the first diagonal support 5.3 of the first side formwork is fixed to the slope surface through a first diagonal support anchor 5.4 of the first side formwork. The first diagonal support anchor 5.4 is anchored to the soil with an anchor rod of length N15 cm (exemplarily, N15=20), and a hook is set at the end exposed to the ground.

[0080] The first diagonal brace 5.3 is a steel pipe with hooks at both ends, one end of which is connected to the hook of the end of the first diagonal brace anchor 5.4 exposed above the ground, and the other end is connected to the top of the first side form 5.1. The first side formwork diagonal brace 5.3 can prevent the steel plate of the first side formwork 5.1 from rotating inward or outward due to loosening after being inserted into the soil, and further reinforce the first side formwork 5.1. The first diagonal brace 5.3 and the first diagonal brace anchor 5.4 are arranged at a specified distance (exemplarily, 2m) along the direction of the first side formwork 5.1.

[0081] After the template, limit plate and diagonal brace of the longitudinal grid 5 of the protective grid are installed, the second side template is installed. Based on the multiple preliminary longitudinal grids, in the area divided by the first side template (5.1), a transverse groove with a depth of N3 cm (exemplarily, N3 = 60 cm) and a width of N4 cm (exemplarily, N430 cm) is excavated every N5 meters (exemplarily, N5 = 6 m) in the transverse direction.

[0082] Based on the transverse groove, another stabilizing mechanism is installed to form a transverse grid 6, including: specifically including: Figure 4 As shown, a steel plate with a height of N5 meters is used as the second side formwork, and the steel plate with a height of N6 centimeters is inserted into the soil along the two sides of the excavated transverse groove. The steel plate with a height of N7 centimeters is close to the transverse groove as the side formwork of the transverse grid concrete. When the longitudinal grid 5 of the protective grid is 6 meters apart, the slope has been divided into strip units with a width of 6 meters. Therefore, the length of each longitudinal grid 5 of the protective grid is 6 meters, and the length of the steel plate of the second side formwork is also 6 meters.

[0083] The length of each section of the second side formwork is N8 meters, the overlap positions are staggered in the same direction, and the overlap length is N9 centimeters to ensure that there is no leakage when pouring the transverse grid concrete.

[0084] Multiple second limit plates are set at intervals between each second side formwork (the limit plates are formed by pouring concrete in sections), and steel plates with a height of N10 meters and a width of N11 centimeters are vertically inserted into the slope at intervals of N12 meters in the second side formwork at intervals of N13 centimeters. The second side formwork is divided into sections at intervals of N14 meters in the horizontal direction, which can prevent the concrete from flowing rapidly downward along the slope when pouring the concrete of the horizontal grid stem, causing concrete segregation. Figure 5 As shown, the second diagonal brace of the second side formwork is fixed to the slope surface through a second diagonal brace anchor 6.4 of the second side formwork. The second side formwork diagonal brace anchor 6.4 is anchored to the soil with an anchor rod of length N15 cm, and a hook is set at the end exposed to the ground.

[0085] The second diagonal brace is a steel pipe with hooks at both ends, one end of which is connected to the hook of the end of the second diagonal brace anchor 6.4 exposed above the ground, and the other end is connected to the top of the second side formwork. The second side formwork diagonal brace can prevent the steel plate of the second side formwork from rotating inward or outward due to loosening when inserted into the soil, and further reinforce the second side formwork. Among them, the second diagonal brace and the second diagonal brace anchor 6.4 are arranged at a specified distance in the direction of the second side formwork.

[0086] The first side formwork 5.1 is chamfered and disconnected at the intersection of the second side formwork and the first side formwork 5.1, so that the first side formwork 5.1 is spatially connected with the second side formwork, ensuring that the longitudinal grid concrete 5.5 and the transverse grid concrete 6.4 are cast into a whole.

[0087] After the two fixing mechanisms are installed, Figure 1 As shown, an anti-slip anchor rod 8 is inserted perpendicular to the slope surface at the center of the square area formed by the intersection of the longitudinal grid 5 and the transverse grid 6, and the length of the anti-slip anchor rod 8 is sufficient to pass through the slip surface of the slope. After the templates of the longitudinal and transverse grids of the protective grid are installed, the anti-slip anchor rod 8 not only plays a role in reinforcing the slope against sliding, but also anchors the strip concrete protective grid to the slope surface, further enhancing the overall reinforcement effect and stability of the slope protection system.

[0088] At the top of the slope, a capping beam 7 is arranged along a direction perpendicular to the longitudinal grid 5 and close to the end of the longitudinal grid 5; the capping beam 7 is exemplarily 80 cm deep and 60 cm wide. The capping beam 7 and the longitudinal grid 5 are integrally cast by concrete, which plays the role of slope capping protection and fixes the protective grid longitudinal grid 5 at the top of the slope, ensuring the stability and durability of the slope protection system.

[0089] Apply concrete release agent to the inner wall of the first side formwork 5.1 and the second side formwork, and then Figure 6As shown, the longitudinal grid concrete 5.5, the transverse grid concrete 6.4 and the top beam 7 are poured at the same time; concrete with a strength of C30 is used for pouring, and after the curing is completed, the demolition work is carried out to remove the side formwork, limit plates, diagonal braces, etc. of the longitudinal grid 5 and the transverse grid 6 of the protective grid. After the demolition, the gap between the concrete and the slope soil is filled with backfill soil to make it dense.

[0090] 3. Construction of interlocking slope protection blocks

[0091] In some embodiments of the present invention, paving the interlocking slope protection blocks 10 specifically includes: after the slope protection grid and the anti-slip anchor rods 8 are constructed, a geotextile filter layer is paved close to the surface of the slope that has been drained and consolidated by the diversion blind ditch 1 and the surface of the longitudinal grid stems 5 and the transverse grid stems 6 of the protection grid;

[0092] The geotextile filter layer adopts 300g / m 2 The anti-seepage geotextile is fully spread on the surface of the slope, close to the longitudinal and transverse grids of the slope protection grid, to reduce the later rainwater infiltration into the slope. Figure 7 shown ( Figure 7 In order to conveniently reflect the longitudinal grid stems 5 and the transverse grid stems 6 of the protective grid, the diversion blind ditch 1 is not drawn, and the interlocking slope protection blocks 10 are only simplified and drawn in one unit, and the interlocking slope protection blocks 10 are interlocked with each other). The interlocking slope protection blocks 10 are laid in each unit separated by the longitudinal grid stems 5 and the transverse grid stems 6 of the protective grid. The paving order of the interlocking slope protection blocks 10 is from top to bottom and from both sides to the middle. Among them, the interlocking slope protection blocks 10 are precast concrete ballast blocks, which are interlocked with each other by wedging.

[0093] The interlocking slope protection blocks 10 play the role of slope protection under the ballast of their own weight. At the same time, the ballast of the interlocking slope protection blocks 10 makes the slope soil further drain and consolidate. According to the paving sequence from top to bottom and from both sides to the middle, it is beneficial to the uniform drainage and consolidation of the soil and reduce the uneven settlement of the slope.

[0094] The wedge grooves of the interlocking slope protection blocks 10 can be arranged in reasonable sizes to ensure that the interlocking slope protection blocks 10 are firmly engaged with each other and to ensure the compressive strength of a single interlocking slope protection block 10 to avoid stress concentration.

[0095] 4. Slope protection and drainage pipe construction

[0096] In some embodiments of the present invention, a drainage pipe 11 is used at the bottom of the slope to collect and discharge the pore water discharged by soil consolidation from the terminal of the diversion blind ditch in an organized manner. The drainage pipe 11 is made of PVC material. For example, when the cross-section of the diversion blind ditch 1 is a rectangle of 50cm*60cm, the cross-sectional area of ​​the end of the drainage pipe 11 that connects with the diversion blind ditch 1 is 52cm*62cm, so that it can be sheathed in the diversion blind ditch 1 to collect the pore water discharged from the diversion blind ditch 1. The terminal cross-section of the drainage pipe 11 is exemplarily a rectangle of 5cm*5cm, which is used for drainage of the bundled mouth. Therefore, for example, the side cross-section of the drainage pipe 11 is a right-angled trapezoid with an upper base of 5cm and a lower base of 62cm.

[0097] The drainage pipe 11 is filled with graded gravel of a specified particle size (exemplarily, such as 1-10 mm) and coarse sand of a second specified fineness modulus (3.7-3.1) and a second specified average particle size (exemplarily, such as 0.5 mm) in a second specified ratio (exemplarily, 2:1) to prevent sand and gravel in the diversion blind ditch 1 from being carried out by the water flow; a dense steel wire mesh is installed at the terminal of the drainage pipe 11 to prevent sand and gravel in the drainage pipe 11 from being carried out by the water flow.

[0098] like Figure 8 As shown, the total length of the drainage pipe 11 is exemplarily 1 m, of which the length connected to the outer jacket of the diversion blind ditch 1 is exemplarily 20 cm, and after the connection is completed, the soil is covered with a specified thickness (exemplarily, 10 cm) and compacted. The length embedded in the slope protection footing 12 is exemplarily 80 cm, and the terminal end of the drainage pipe 11 is flush with the edge of the slope protection footing 12.

[0099] The slope protection footing 12 is arranged at the bottom of the slope, exemplarily, with a height of 1.5m, a designated part (exemplarily, 80cm) is buried underground, and the remaining part (exemplarily, 70cm) is located above ground, nesting the drainage pipe 11, and the top elevation is consistent with the compacted cover elevation of the drainage pipe 11. The slope protection footing 12 is exemplarily 80cm wide, and is cast with cast-in-place concrete with a strength of C30, playing the role of slope footing. The slope protection footing 12 embedded in the ground can block the sliding tendency of the slope under the action of its own weight, and at the same time make the slope protection system more beautiful and harmonious.

[0100] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A composite protection system construction method for water-rich sandy loam slope, characterized in that: The method comprises: S1. Excavation and backfilling of diversion blind ditch: a diversion blind ditch (1) is excavated at intervals of N1 meters on the slope surface, and the diversion blind ditch (1) is backfilled and then arched; S2, construction of the slope protection grid: after arching, trenches are excavated to form longitudinal grid stems (5) and transverse grid stems (6) of the protection grid to form the slope protection grid; S3, construction of interlocking slope protection blocks: after forming the slope protection grid, paving the interlocking slope protection blocks (10) in the units separated by the longitudinal grid stems (5) and the transverse grid stems (6) of the protection grid; S4, slope protection footing and drainage pipe construction: After laying the interlocking slope protection blocks (10), a drainage pipe (11) is used to cover the diversion blind ditch (1) at the bottom of the slope, and a slope protection footing (12) is arranged at the bottom of the slope and embedded in the drainage pipe (11).

2. A composite protection system construction method for water-rich sandy loam slope according to claim 1, characterized in that: In step S1, backfilling specifically includes: After the diversion blind ditch (1) is excavated, a blind ditch sand cushion layer (2) is laid at the bottom; After the blind ditch sand cushion layer (2) is laid, a blind ditch graded crushed stone layer (3) is laid on the blind ditch sand cushion layer (2); After the blind ditch graded crushed stone layer (3) is laid, the remaining space in the diversion blind ditch (1) is backfilled with compacted covering soil (4) to close and level the diversion blind ditch (1).

3. A composite protection system construction method for water-rich sandy loam slope according to any one of claims 1-2, characterized in that: In step S1, arching specifically includes: With the longitudinal central axis of each diversion blind ditch (1) as the center, clay with a specified moisture content is used to compact and lay along the longitudinal central axis of the diversion blind ditch (1) to both sides at a specified slope with a reduced height, so as to complete the laying of the ultra-wide compacted covering soil.

4. A composite protection system construction method for water-rich sandy loam slope according to claim 1, characterized in that: In step S2, forming the longitudinal grid (5) and the transverse grid (6) of the protective grid specifically includes: Taking the central axis between any two diversion blind ditches (1) as the reference, a longitudinal groove with a depth of N3 cm and a width of N4 cm is excavated at every N2 m interval; A stabilizing mechanism is installed based on the longitudinal groove to form a longitudinal grid (5); Based on the preliminary longitudinal grid lines, dig transverse trenches with a depth of N3 cm and a width of N4 cm at intervals of N5 in the transverse direction; Another stabilizing mechanism is installed based on the transverse groove to form a transverse grid (6); An anti-slip anchor rod (8) is inserted perpendicularly to the slope surface at the intersection of the protective grid at the center of the square area formed by the intersection of the longitudinal grid stem (5) and the transverse grid stem (6), and the length of the anti-slip anchor rod (8) is sufficient to pass through the slip surface of the slope.

5. A composite protection system construction method for water-rich sandy loam slope according to claim 4, characterized in that: The first stabilizing mechanism is installed based on the longitudinal groove to form the longitudinal grid (5), which specifically includes: A steel plate is used as a first side formwork (5.1), which is inserted along the two side walls of the excavated longitudinal groove and closely adheres to the longitudinal groove as a side formwork for the longitudinal grid concrete (5.5); The overlap positions of the first side formwork (5.1) are staggered in the same direction; A plurality of first limiting plates (5.2) are arranged at intervals between each first side template (5.1); The first diagonal brace (5.3) of the first side formwork is fixed to the slope surface through a first diagonal brace anchor (5.4), the first diagonal brace anchor (5.4) is anchored to the soil with an anchor rod, and a hook is provided at the end exposed to the ground; The first diagonal brace (5.3) and the first diagonal brace anchor (5.4) are arranged at a specified interval along the direction of the first side formwork (5.1).

6. A composite protection system construction method for water-rich sandy loam slope according to claim 5, characterized in that: The second stabilizing mechanism is installed based on the transverse groove to form a transverse grid (6), comprising: Use steel plates as the second side formwork, insert them along the two side walls of the excavated transverse groove and close to the transverse groove as the side formwork of the transverse grid concrete; The second side formwork, the overlap positions are placed staggered in the same direction; A plurality of second limiting plates are arranged at intervals between each second side template; The second diagonal brace of the second side formwork is fixed to the slope surface through a second diagonal brace anchor (6.4), the second diagonal brace anchor (6.4) is anchored to the soil with an anchor rod, and a hook is set at the end exposed to the ground; The second diagonal brace and the second diagonal brace anchor (6.4) are arranged at a specified interval along the direction of the second side formwork.

7. A composite protection system construction method for water-rich sandy loam slope according to claim 6, characterized in that: In step S2, forming the longitudinal grid (5) and the transverse grid (6) of the protective grid specifically includes: The first side template (5.1) is chamfered and disconnected at the position where the second side template and the first side template (5.1) intersect, so that the first side template (5.1) is spatially connected to the second side template; A concrete release agent is applied to the inner wall of the first side formwork (5.1) and the second side formwork, and then the longitudinal grid concrete (5.5), the transverse grid concrete (6.4) and the top beam (7) are poured simultaneously; After the maintenance is completed, the demolition work is carried out. After the demolition, the gap between the concrete and the slope soil is filled with backfill soil to make it dense.

8. A composite protection system construction method for water-rich sandy loam slope according to any one of claims 1 to 7, characterized in that: In step S2, forming the longitudinal grid (5) and the transverse grid (6) of the protective grid specifically includes: At the top of the slope, a top beam (7) is arranged in a direction perpendicular to the longitudinal grid stem (5) and close to the end of the longitudinal grid stem (5); the top beam (7) and the longitudinal grid stem (5) are integrally cast by concrete.

9. A composite protection system construction method for water-rich sandy loam slope according to claim 1, characterized in that: In step S3, paving the interlocking slope protection blocks (10) specifically includes: The geotextile filter layer is laid close to the surface of the slope that has been drained and consolidated by the diversion blind ditch (1) and the surface of the longitudinal grid stems (5) and the transverse grid stems (6) of the protective grid; After the geotextile filter layer is paved, interlocking slope protection blocks (10) are laid in the units separated by the longitudinal grid stems (5) and the transverse grid stems (6) of the protective grid. The interlocking slope protection blocks (10) are laid in the order from top to bottom and from both sides to the middle. The interlocking slope protection blocks (10) are prefabricated concrete ballast blocks that are interlocked with each other by wedging.

10. A composite protection system construction method for water-rich sandy loam slope according to any one of claims 1 to 7, characterized in that: In step S4, a drainage pipe (11) is used to cover the diversion blind ditch (1) at the bottom of the slope, and a slope protection footing (12) is arranged at the bottom of the slope and nested in the drainage pipe (11), which specifically includes: At the bottom of the slope, a drainage pipe (11) is used to collect the pore water discharged by soil consolidation from the terminal of the diversion blind ditch and discharge it in an organized manner; Filling the drainage pipe (11) with crushed stone of a specified particle size distribution and coarse sand of a second fineness modulus and a second average particle size in a second specified ratio; installing a dense steel wire mesh at the end of the drainage pipe (11); The drainage pipe (11) is connected to the diversion blind ditch (1), and after the connection is completed, the soil is covered with a specified thickness and compacted, and the terminal end of the drainage pipe (11) is flush with the edge of the slope protection footing (12); The slope protection footing (12) is arranged at the bottom of the slope, with a designated part buried underground and the remaining part located above ground, and the drainage pipe (11) is nested therein, and the top elevation is consistent with the compacted covering soil elevation of the drainage pipe (11).

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