A reinforcing device for a highly weathered mudstone slope

Abstract

The utility model belongs to the technical field of slope reinforcement, especially relates to a reinforcing device for strong weathered mudstone slope, a plurality of drill holes are arranged in the slope along the slope surface and are inwardly arranged, two threaded steels are inserted into the middle part of the same drill hole of the slope after being welded and galvanized side by side, the threaded steel and the gap between the drill hole are grouted and filled to form a full-length adhesive type anchor rod, a plurality of rows of drainage holes are arranged above 1m along the slope bottom, a drainage pipe is arranged in the drainage hole, an opening is arranged on the pipe wall of the drainage pipe, the drainage pipe is wrapped with geotextile, a panel wall is arranged on the surface of the slope, the panel wall is poured with concrete, the outer end of the anchor rod, the drainage pipe, the main reinforcement and the tensile reinforcement are poured in the panel wall, the main reinforcement is in a net shape and is designed in a double-layer mode, the tensile reinforcement supports between the double-layer main reinforcements, the slope deposits on the back of the panel wall are removed, the filler is additionally arranged and is compacted in layers to the top elevation of the panel wall, and a drainage ditch is arranged at the slope bottom. The device adopts "minimally invasive anchoring + panel wall closure + slope bottom drainage" cooperation, and the multiple protection systems mainly adopt active constraint and secondarily adopt passive support, so as to ensure the stability of the slope.

Description

Technical Field

[0001] This utility model belongs to the field of slope reinforcement technology, and in particular relates to a reinforcement device for strongly weathered mudstone slopes. Background Technology

[0002] The stability of slope engineering is crucial to the safety of the entire project during construction and operation. The surrounding environment of slopes is complex, with significant differences in height, slope, geological and hydrological conditions. Existing slope reinforcement devices require a large construction area, affecting the integrity of weathered mudstone slopes. Furthermore, inadequate drainage systems lead to water accumulation inside the slope, increasing the weight of the soil and rock, reducing shear strength and sliding resistance, and making the slope prone to instability. Utility Model Content

[0003] The purpose of this invention is to provide a reinforcement device for strongly weathered mudstone slopes, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A reinforcement device for strongly weathered mudstone slopes includes threaded steel bars and a plate wall. Multiple boreholes are drilled inwards along the slope surface, inclined downwards at an angle of 15-20° to the horizontal. The horizontal and vertical distances between adjacent boreholes are 2.5-3.5m. A support frame is uniformly fixed radially and axially around the outer circumference of the threaded steel bars. The support frame is semi-circular. Two threaded steel bars are welded side-by-side and galvanized before being inserted into the middle of the same borehole on the slope. The support frame ensures that the threaded steel bars are centered within the borehole. The borehole depth exceeds the threaded steel bars by 0.5m to ensure space for sediment. The end of the threaded steel bars is located outside the borehole. The gap between the threaded steel bars and the borehole is filled by grouting to form a full-length bonded anchor. To limit slope displacement, multiple rows of drainage holes are opened at least 1m above the slope bottom, arranged in a quincunx pattern. The drainage holes extend 1-3m from the slope surface into the slope and are inclined upwards at 6-10°. Drainage pipes are placed inside the drainage holes, with through holes in the pipe walls. The drainage pipes are wrapped with geotextile. A concrete slab wall is installed on the slope surface. The slab wall contains the outer ends of anchor rods, drainage pipes, main reinforcement bars, and tie bars. The main reinforcement bars are arranged in a mesh pattern, vertically arranged in both the horizontal and vertical directions, and adopt a double-layer design. The two layers of main reinforcement bars are supported and reinforced by tie bars. The distance from the outermost main reinforcement bar to the surface of the slab wall is ≥50mm. A drainage ditch is installed below the bottom of the slab wall and is connected to the plant's drainage system.

[0005] Preferably, the rebar is 25mm HRB400, the length of the rebar is 12-15m, the radial angle between adjacent support frames on the outer periphery of the rebar is 60° or 90°, the axial adjacent support frames are parallel to each other, and the spacing between support frames on the same axial straight line is 3-4m.

[0006] Preferably, the wall panel is made of C30 concrete with a thickness of 300-500mm. The end of the threaded steel bar outside the drill hole is bent by 15-20cm, and the end of the bent section is connected to a continuous transverse reinforcing bar. The reinforcing bar is parallel to the transverse main bar, so that the wall panel and the anchor rod form an integral whole, forming a comprehensive slope treatment measure.

[0007] Preferably, the main reinforcing bars are made of 22mm HRB400 threaded steel with a spacing of 250-300mm, and the tie bars are made of 8mm HRB300 steel with a spacing of 500-600mm.

[0008] Preferably, the grouting material is P.O42.5 cement paste with a water-cement ratio of 0.38-0.45.

[0009] Preferably, the drainage holes are arranged in three rows with a diameter of 90-100mm, and the horizontal spacing between the drainage holes is 3-4m, and the vertical spacing is 3-4m.

[0010] Preferably, the drainage pipe is a DN75-85 PVC pipe.

[0011] Preferably, the drainage ditch is made of concrete, and the width and height of the drainage ditch are 50-80cm.

[0012] Preferably, when there is colluvium on the back of the wall, the colluvium is removed and then filler is added, and the filler is compacted in layers to the top elevation of the wall.

[0013] Preferably, the filler is gravelly soil or cohesive soil, wherein the gravelly soil has a particle size of 5-40 mm and good gradation; and the cohesive soil has a compaction degree of ≥90%.

[0014] This reinforcement device is suitable for strongly weathered mudstone slopes with a slope ratio of 1:0.4-1:0.75.

[0015] The beneficial effects achieved by this utility model are as follows: (1) The support frame around the threaded steel bar prevents the threaded steel bar from falling to the bottom of the borehole and is centered in the borehole. The full-length bonded anchor rod formed by full casting enhances the anchoring force of the anchor rod. The main reinforcement in the wall panel adopts a double-layer design and is supported and reinforced by tie bars. Combined with the continuous reinforcement bars, the overall tensile strength is enhanced to prevent the wall panel from cracking. (2) The geotextile outside the drainage pipe filters the mud and sand on the slope, prevents the drainage pipe hole from being blocked, and ensures good drainage effect; (3) A multi-layered protection system is adopted, which combines “minimally invasive anchoring + plate wall sealing + slope bottom drainage”, with active restraint as the main method and passive support as the auxiliary method. Small-diameter threaded steel is used to reduce the disturbance to the slope and form a three-dimensional spatial anchoring system. The galvanized grouting of the threaded steel provides double protection to reduce steel corrosion. The interaction with the rock mass forms a new composite, which transfers the sliding force to the stable rock layer, improves the mechanical parameters and stress state of the rock mass itself, effectively limits the deformation of the supported rock mass, and improves the integrity of the rock mass. The plate wall provides continuous support and sealing to the slope surface, and distributes the local load evenly to the anchor group to improve the stability of the slope. At the same time, the drainage pipe combined with the drainage ditch ensures smooth drainage and prevents water accumulation at the slope toe, which would reduce the strength of the rock mass. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is an elevation view of the panel wall in an embodiment of this utility model; Figure 3 This is an elevation view of the connection between the wall panel and the threaded steel bar in an embodiment of this utility model; Figure 4 This is a diagram showing the connection relationship of the threaded steel bars in an embodiment of this utility model; Figure 5 This is a cross-sectional view of the connection between the threaded steel and the support frame in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Slope; 2. Threaded steel bar; 3. Wall panel; 4. Support frame; 5. Main reinforcement; 6. Tie bar; 7. Reinforcing bar; 8. Drainage hole; 9. Drainage pipe; 10. Colluvium; 11. Fill material; 12. Drainage ditch; 13. Drill hole; 14. Grouting. Detailed Implementation

[0018] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0019] Using a strongly weathered mudstone slope with a slope ratio of 1:0.4 as a background, the following methods were employed: Figure 1-5The reinforcement device for the strongly weathered mudstone slope shown includes threaded steel bars 2 and a wall panel 3. Multiple boreholes 13 are drilled inward along the slope surface 1. The boreholes 13 are inclined downward at an angle of 15° with the horizontal direction. The horizontal and vertical distances between adjacent boreholes 13 are both 2.5m. The threaded steel bars 2 are 25mm HRB400 and 12m long. Two threaded steel bars 2 are welded side by side, galvanized, and inserted into the middle of the same borehole 13 in the slope 1. The depth of the borehole 13 exceeds that of the threaded steel bars by 0.5m. Support frames 4 are uniformly fixed radially and axially around the outer periphery of the threaded steel bars 2. The support frames 4 are semi-circular arcs. The radial angle between adjacent support frames 4 is 90°, and the axial angle between adjacent support frames 4 is parallel. The spacing between support frames 4 on the same axial straight line is 3m. The gap between the threaded steel bars 2 and the boreholes 13 is filled by grouting 14 to form a full-length bonded anchor. The grouting material 14 is P.O42.5 cement paste with a water-cement ratio of 0.38. The anchoring force of a single anchor rod is 150kN. The end of the threaded steel bar 2 located outside the slope 1 is bent by 15cm, and the end of the bent section is connected to a continuous transverse reinforcing bar 7. Three rows of drainage holes 8 are opened at least 1m above the bottom of the slope. The drainage holes 8 are distributed in a quincunx pattern. The drainage holes 8 extend from the outside of the wall 3 to 1m inside the slope 1 and are inclined upward at 6°. The diameter of the holes is 90mm. The horizontal spacing of the drainage holes 8 is 2m, and the vertical spacing is 2m. Drainage pipes 9 are placed inside the drainage holes 8. The drainage pipes 9 are made of DN75 PVC pipes, and through holes are opened in the pipe wall of the drainage pipes 9. The drainage pipe 9 is wrapped with geotextile. A wall 3 is installed on the surface of slope 1. The wall 3 is made of C30 concrete and is 300mm thick. The wall 3 contains cast rebar 2, main reinforcement 5, tie bars 6, reinforcing bars 7, and the drainage pipe 9. The main reinforcement 5 is a mesh pattern, vertically arranged both horizontally and vertically, and uses a double-layer design. The two layers of main reinforcement 5 are supported and reinforced by tie bars 6. The main reinforcement 5 uses 22mm HRB400 cast rebar with a spacing of 250mm. The tie bars 6 use 8mm HRB300 steel bars with a spacing of 500mm. The reinforcing bars 7 are flush with the horizontal main reinforcement 5. Okay, the distance from the outermost main reinforcement 5 to the surface of the wall panel 3 is ≥50mm. First, remove the sloping deposits 10 on the upper part of the back of the wall panel 3, then add fill material 11. The fill material 11 is cohesive soil with a compaction degree ≥90%. Fill in layers to the top elevation of the wall panel 3. A drainage ditch 12 is set below the bottom of the wall panel 3. The drainage ditch 12 is made of concrete, with a width of 50cm and a height of 50cm. The drainage ditch 12 is connected to the plant's drainage system. Through axial and radial fixed support frames, prevent the threaded steel bars from falling to the bottom of the borehole and ensure that they are centered inside the borehole. Full-length bonded anchors, cast entirely within the borehole, transfer sliding forces to stable rock strata. The main reinforcement of the slab wall is bidirectionally arranged horizontally and longitudinally, with a double-layer design. Tie bars provide support and reinforcement, enhancing the tensile strength of the slab wall. Horizontal reinforcement bars connect the slab wall and anchors into a unified structure, collectively improving rock mass stability. Drainage holes are angled upwards to facilitate water flow through drainage pipes, and geotextile filters sediment from the slope, preventing blockage. A comprehensive treatment approach, combining slab wall anchor retaining walls and drainage ditches at the bottom of the slope, reinforces the slope and ensures its stability.

[0020] Reinforcement process: such as Figure 1-5As shown, multiple boreholes 13 are drilled from the slope surface inwards and downwards on a strongly weathered mudstone slope 1. The horizontal and vertical distances between adjacent boreholes 13 are both 2.5m. The boreholes 13 are at a 15° angle to the horizontal. Three rows of upward-sloping drainage holes 8 are drilled more than 1m above the slope bottom. The drainage holes 8 are at a 6° angle to the horizontal. Drainage pipes 9 are placed inside the drainage holes 8 and wrapped with geotextile. Two threaded steel bars 2 with external fixed support frames 4 are welded side by side and galvanized and inserted into the middle of the boreholes 13. The depth of the boreholes 13 exceeds the threaded steel bars by 0.5m. The support frames 4 center the threaded steel bars 2 in the boreholes 13. The ends of the threaded steel bars 2 outside the slope 1 are bent by 15cm, and the ends of the bent sections are connected to the boreholes. Long transverse reinforcing bars 7 are injected into borehole 13 with P.O42.5 cement grout. C30 concrete is poured along the slope 1 to form a panel wall 3. During the pouring process, grid-like main bars 5 are placed and tie bars 6 are placed between the double-layer main bars. The grid-like main bars 5, tie bars 6, transverse continuous reinforcing bars 7 and drainage pipes 9 are poured together in the panel wall 3. The drainage pipes 9 extend to the outside of the panel wall 3. The slope deposits 10 on the back of the panel wall 3 are removed first, and then cohesive soil is added. The compaction degree of the cohesive soil is ≥90%. It is filled in layers to the top elevation of the panel wall 3. A drainage ditch 12 is poured with concrete below the bottom of the panel wall 3. The drainage ditch 12 is 50cm wide and 50cm high. The drainage ditch 12 is connected to the factory area drainage system.

Claims

1. A reinforcement device for strongly weathered mudstone slopes, characterized in that, The structure includes rebar and a wall panel. Multiple boreholes are drilled inward along the slope surface, with the boreholes inclined downwards at an angle of 15-20° to the horizontal. The horizontal and vertical distances between adjacent boreholes are 2.5-3.5m. Support frames are uniformly fixed radially and axially around the outer circumference of the rebar, forming a semi-circular arc. Two rebars are welded side-by-side and galvanized before being inserted into the middle of the same borehole in the slope. The borehole depth exceeds the rebar depth by 0.5m, with the end of the rebar located outside the borehole. The gap between the rebar and the borehole is filled with grout to form a full-length bonded anchor. Multiple rows of drainage holes are drilled at least 1m upwards from the bottom of the slope. The drainage holes are distributed in a quincunx pattern, extending 1-3m from the slope surface into the slope and inclined upwards at 6-10°. Drainage pipes are placed inside the drainage holes, with through holes in the pipe walls. The drainage pipes are wrapped with geotextile. A concrete slab wall is installed on the slope surface. The slab wall contains the outer ends of anchor rods, drainage pipes, main reinforcement bars, and tie bars. The main reinforcement bars are arranged in a mesh pattern, vertically arranged in both the horizontal and vertical directions, and adopt a double-layer design. The two layers of main reinforcement bars are supported and reinforced by tie bars. The distance from the outermost main reinforcement bar to the surface of the slab wall is ≥50mm. A drainage ditch is installed below the bottom of the slab wall and is connected to the plant's drainage system.

2. The reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The rebar is 25mm HRB400, the length of the rebar is 12-15m, the radial angle between adjacent support frames on the outer periphery of the rebar is 60° or 90°, the axial adjacent support frames are parallel to each other, and the spacing between support frames on the same axial straight line is 3-4m.

3. The reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The wall panel is made of C30 concrete with a thickness of 300-500mm. The end of the threaded steel bar outside the drill hole is bent by 15-20cm, and the end of the bent section is connected to a continuous transverse reinforcing bar, which is parallel to the transverse main reinforcement bar.

4. The reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The main reinforcement bars are made of 22mm HRB400 threaded steel with a spacing of 250-300mm, and the tie bars are made of 8mm HRB300 steel with a spacing of 500-600mm.

5. A reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The grouting material is P.O42.5 cement paste with a water-cement ratio of 0.38-0.

45.

6. A reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The drainage holes are arranged in three rows, with a diameter of 90-100mm. The horizontal spacing between the drainage holes is 3-4m, and the vertical spacing is 3-4m.

7. A reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The drainage pipe is a DN75-85 PVC pipe.

8. A reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, The drainage ditch is constructed of reinforced concrete, with a width of 50-80cm and a height of 50-80cm.

9. A reinforcement device for strongly weathered mudstone slopes according to claim 1, characterized in that, When there is sloping material on the back of the wall, the sloping material is removed and then filler is added, and the filler is compacted in layers to the top elevation of the wall.

10. A reinforcement device for strongly weathered mudstone slopes according to claim 9, characterized in that, The filler material is gravelly soil or cohesive soil. The gravelly soil has a particle size of 5-40 mm and good gradation. The cohesive soil has a compaction degree of ≥90%.

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