Slope protection construction method

Abstract

The present invention discloses a slope protection construction method. The method comprises the following steps: 1) digging a guide ditch along the bottom of the slope; 2) laying a geotextile on the slope surface; 3) lowering gabion boxes layer by layer in a step-like manner from the guide ditch, filling the lower gabion boxes with stones and sealing the boxes with twisted edges before placing the upper gabion boxes; 4) performing partial backfilling and greening planting after passing the inspection. The present invention improves the anti-scouring and soil and water conservation capabilities by laying a geotextile on the soil contact surface.

Description

Technical Field

[0001] The invention relates to a slope protection construction method, which mainly protects a side slope or a slope by using a gabion stone cage. Background Art

[0002] Slope protection projects are mainly set up to reduce slope erosion and prevent soil erosion. Usually, stone slope protection and concrete slope protection are used. Stone slope protection is mostly built by hand, and the construction speed is slow; the quality of concrete construction of concrete slope protection is greatly affected by the slope rate, and it is difficult to green it. Traditional slope protection often uses drainage pipes to balance the water and soil pressure behind the wall. Drainage pipes are often blocked and fail due to improper manual burial and the influence of the surrounding environment, which leads to an imbalance of internal and external pressures and collapse.

[0003] Gabion cages (Gabian) are box-shaped structures assembled from gabion nets, also known as gabion cages and gabion boxes. During construction, the boxes are filled with stones on site and used to build retaining walls, river footings, dykes and other structures. The structure has the characteristics of flexibility, permeability and integrity, so it is suitable for use in slope protection projects. Although gabion materials are widely used, there are also some problems in actual construction. These problems are mainly due to the presence of many gaps in the gabion cage structure, and water continues to seep and scour in the gaps, which has a great impact on the stability of the structure itself and the surrounding soil. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a slope protection construction method, which can improve the anti-scouring and soil and water conservation capabilities after the slope protection is carried out using gabion stone cages.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A slope protection construction method comprises the following steps: 1) digging a guide ditch along the bottom of the slope; 2) laying a geotextile on the slope surface;

[0007] 3) Lower the gabion boxes layer by layer in a step-like manner from the guide ditch, fill the lower gabion boxes with stones, twist the edges and seal the boxes before placing the upper gabion boxes; 4) After passing the inspection, carry out partial backfilling and greening planting.

[0008] In multiple embodiments, the gabion boxes are assembled before being lowered, and the box groups are connected and tied after being lowered; when assembling the gabion boxes, the spacer net and the net body should intersect at 90°, and a rectangular box group is formed by tying, and the adjacent frame lines between the spacer net and the net body are connected by a combination line, and the combination line connection is to use a binding line - a single circle around a hole to - a double circle around a hole, and alternately twisted; when connecting and tying the box groups, the upper and lower corners of the adjacent box groups are tied once, the upper and lower frame lines or fold lines are tied once every 25 cm, and the mesh joint surface is tied at 2 places per square meter. After filling the box with stones to a height of 1 / 3 each time, the exposed parts of the mesh are provided with a tensioning line, and the mesh is tightened and fixed inward in an eight-shaped shape.

[0009] In multiple embodiments, before lowering the gabion boxes, support tools are placed at intervals along the arrangement direction of the gabion boxes. The support tools are fixed in the guide ditch or on the top of the lower gabion boxes to support the sides of the gabion boxes. The support tools are recovered after filling with stones.

[0010] In at least one embodiment, the support tool comprises an angle steel, a side plate, a plug rod and a locking piece, one end of the plug rod is vertically fixed to an inner surface of the middle part of the angle steel, and the other end is set to a pointed end, the side plate is vertically fixed to the middle part of an edge of the angle steel, and the side plate and the plug rod are at a right angle, a total of four strip holes are opened on the angle steel on different surfaces on both sides of the plug rod along the length direction, the strip holes are provided with the aforementioned locking piece, the locking piece comprises a clamping plate, a screw rod vertically fixed to the clamping plate, and an adjusting nut threadedly connected to the screw rod, the clamping plate is located on the outer side of the angle steel, the width of the strip hole is greater than the width of the clamping plate but less than the length of the clamping plate, the screw rod passes through the strip hole, the adjusting nut is located on the inner side of the angle steel, and its size is greater than the width of the strip hole;

[0011] When the support tool is used in the guide ditch, the tip of the insertion rod is fixedly inserted in the guide ditch and supported on the side of the gabion box, the side plate faces away from the gabion box, and the card plate close to the gabion box is stuck in the mesh of the gabion box;

[0012] When the supporting tool is used for the lower gabion box, the side plate faces away from the upper gabion box and is placed on the top of the lower gabion box, the insertion rod faces upward and is supported on the side of the gabion box, and the clamping plates on the two surfaces of the angle steel are respectively clamped in the mesh holes of the upper and lower gabion boxes.

[0013] The beneficial effects of the present invention are: 1. Geotextile is laid on the soil contact surface to improve the anti-scouring and soil and water conservation capabilities; 2. The gabion stone cage slope protection is flexible, permeable and integral. After the cage is installed, the soil layer can be directly covered on the surface steps of the cage, grass seeds can be sown, vegetation can be planted, etc. to achieve a rapid greening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] One or more embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0015] Figure 1 A flowchart of an embodiment of the slope protection construction method of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the embodiment using combined line connection;

[0017] Figure 3 for Figure 1 The overall structure diagram of the embodiment after construction;

[0018] Figure 4 A schematic diagram of a support tool according to an embodiment of the present invention being used in a guide channel;

[0019] Figure 5 for Figure 4 A schematic diagram of a support tool of an embodiment used on a lower gabion box;

[0020] Figure 6 for Figure 4 A perspective view of a support tool of an embodiment;

[0021] Figure 7 for Figure 5 a side view of the support tool;

[0022] Figure 8 A schematic structural diagram of an embodiment of a locking member of a support tool;

[0023] Fig. 9 This is a rendering of a return visit after completion of an embodiment of the present invention.

[0024] In the figure: 1. Slope; 2. Guide ditch; 3. Geotextile; 4. Sandbag; 5. Gabion box; 6. Support tool; 61. Angle steel; 62. Strip hole; 63. Side plate; 64. Insert rod; 65. Locking piece; 651. Clamp plate; 652. Connecting nut; 653. Screw; 654. Adjusting nut; 66. Connecting seat. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present invention can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided herein to make the disclosure of the present invention more complete and to fully convey the concept of the present invention to those skilled in the art.

[0026] On the one hand, the inventors aimed at the drawback of the existing technology that the gabion box slope protection has insufficient anti-scour ability. The inventors believe that the main reason for the above technical problems is that there are many gaps in the gabion box structure. After water comes from the slope direction, it can continuously seep and scour in the gaps without any obstruction, which on the one hand causes structural instability, and on the other hand makes it difficult to carry out effective greening on the box. Based on the above analysis, the inventor's first major improvement point is: during the construction process, geotextile is laid on the back slope of the box.

[0027] refer to Figure 1 , a slope protection construction method according to an embodiment of the present invention comprises the following steps: 1) excavating a guide ditch along the bottom of the slope;

[0028] 2) Lay geotextile on the slope; 3) Lower gabion boxes layer by layer in a step-like manner from the guide ditch, fill the lower gabion boxes with stones and seal the boxes with twisted edges before placing the upper gabion boxes; 4) Carry out partial backfilling and greening planting after passing the inspection.

[0029] In step 1), the excavation of the guide ditch is carried out by excavation with an excavator and manual leveling; the excavation size is the positioning size of the designed gabion box. In some special cases, such as when the height behind the slope protection wall is too small (less than 2 meters) and the geological environment is stable, a zero excavation method (no excavation) can be adopted to achieve the effect of no backfill or less backfill.

[0030] In step 2), the geotextile is held down with sandbags during laying.

[0031] In step 3), the filling stone is layered, and the thickness of each layer is less than 30 cm;

[0032] refer to Figure 2 Before the gabion boxes are lowered, the gabion boxes are assembled first, and then connected and tied between the boxes after lowering; when assembling the gabion boxes, the spacer net and the net body should intersect at 90 degrees, and a rectangular box group is formed by tying. The adjacent frame lines between the spacer net and the net body are connected by a combination line, and the combination line connection is to use a binding line - a single circle around the hole and a double circle around the hole, and twisted alternately; when connecting and tying between the boxes, the upper and lower corners of the adjacent boxes are tied once, the upper and lower frame lines or fold lines are tied once every 25cm, and the mesh joint surface is tied at 2 places per square meter. After filling the box with stones 1 / 3 high each time, the exposed parts of the mesh are set with a tie wire, and tightened and fixed inward in an eight-shaped shape.

[0033] In step 4), before the greening planting, the top of the gabion box is filled with loam 5 to 10 cm high, and then grass seeds are spread and vegetation is planted to achieve a rapid greening effect.

[0034] refer to Figure 3, which is a schematic diagram of the overall structure after construction and before backfilling. In the figure, a guide ditch 2 is opened on the protective side of the slope 1, and three layers of gabion boxes 5 are stacked upward along the guide ditch 2; the slope surface of the slope 1 is covered with a geotextile 2, and the geotextile 2 needs to be pressed with sandbags 4 during construction to prevent it from falling off or shifting; after construction, the empty part in the figure can be backfilled.

[0035] This embodiment arranges a semi-permeable geotextile between the soil layer and the gabion box to reduce water flow, thereby reducing scouring of the slope protection and avoiding rapid loss of soil in the gabion box. At the same time, a certain reasonable amount of water flow passes through the entire structure, which not only utilizes the flexibility and permeability of the gabion box, but also ensures its stability and is conducive to the planting and maintenance of vegetation.

[0036] On the other hand, the inventors found during the construction process that since the gabion box itself is made of gabion nets, when the gabion box is lowered and before it is sealed, it has a certain degree of flexibility, and the height of each box is not low (usually about 1m), it is very easy to be uneven when arranged and combined, affecting the construction accuracy and the stability of the entire structure. In response to this technical problem, the inventor's second major improvement is: during the construction process, the support tools set at intervals are introduced to support the gabion box from the side.

[0037] refer to Figure 4 and Figure 5 In a slope protection construction method according to an embodiment of the present invention, before lowering the gabion boxes 5, support tools 6 are placed at intervals along the arrangement direction of the gabion boxes 5. The support tools 6 are fixed in the guide ditch 2 or on the top of the gabion boxes 5 in the lower layer, and are used to support the side of the gabion boxes 5. The support tools 6 are recovered after filling with stones.

[0038] Continue to refer Figures 6 to 8 The support tool 6 includes an angle steel 61, a side plate 63, a plug rod 64 and a locking piece 65. One end of the plug rod 64 is vertically fixed to an inner surface of the middle part of the angle steel 61, and the other end is set to a tip. The side plate 63 is vertically fixed to the middle part of an edge of the angle steel 61, and the side plate 63 and the plug rod 64 are at a right angle. A total of four strip holes 62 are opened on the angle steel 61 on different surfaces on both sides of the plug rod 64 along the length direction, and the strip holes 62 are provided with the aforementioned locking pieces. The locking member 65 comprises a clamping plate 651, a screw rod 653 vertically fixed on the clamping plate 651, and an adjusting nut 654 threadedly connected to the screw rod 653. The clamping plate 651 is located on the outer side of the angle steel 61. The width of the strip hole 62 is greater than the width of the clamping plate 651 but less than the length of the clamping plate 651. The screw rod 653 passes through the strip hole 62. The adjusting nut 654 is located on the inner side of the angle steel 61 and has a size greater than the width of the strip hole 62.

[0039] When the support tool 6 is used in the guide groove 2, the tip of the insertion rod 64 is fixedly inserted in the guide groove 2 and supported on the side of the gabion box 5, the side plate 63 faces away from the gabion box 5, and the clamping plate 651 close to the gabion box 5 is clamped in the mesh of the gabion box 5;

[0040] When the supporting tool 6 is used for the lower gabion box 5, the side plate 63 faces away from the upper gabion box 5 and is placed on the top of the lower gabion box 5, the insertion rod 64 faces upward and is supported on the side of the gabion box 5, and the clamping plates 651 on the two surfaces of the angle steel 61 are respectively clamped in the mesh holes of the upper and lower gabion boxes 5.

[0041] Since the guide ditch 2 and the bottom of the gabion box 5 are made of different materials, the support tool 6 can be placed upside down or upright. When in use, the locking member 65 can move in the strip hole 62 to find a suitable mesh position that can be inserted into the card plate 651. After tightening the adjustment nut 654, the locking member 65 can be ensured not to move, and the entire support tool 6 can be ensured not to shake easily. Obviously, the adjustment nut 654 is preferably a butterfly nut that is easy to rotate.

[0042] Optionally, the support tool 6 also includes a connecting seat 66, which is two nuts in the same axial direction. The two nuts are fixedly connected to the inner surface of the angle steel 61 and the plug rod 64 that are parallel to each other. The end of the plug rod 64 is threadedly connected to the two to facilitate material collection and processing.

[0043] Optionally, the locking piece 65 also includes a connecting nut 652, which is fixed on the clamping plate 651, and the screw rod 653 is threadedly connected to the connecting nut 652. The thickness of the regular hexagonal nut 652 is no greater than the depth of the bar hole 62, and the spacing between the two parallel side surfaces is equal to the width of the bar hole 62. The use of a connecting nut 652 of this shape and size can prevent the entire locking piece 65 from not rotating after further locking after tightening the adjusting nut 654, making it more secure.

[0044] The construction method of the present invention has been used by the applicant in multiple projects. Fig. 9 This is the effect picture after the completion of the urban and rural construction land increase and decrease linkage project in Zhaoping County, Hezhou City. The implementation area of ​​the project is about 455.83 hectares, including the demolition of buildings and seedlings in the demolition area of ​​46 villages in Zhaoping County, Hezhou City, Guangxi, and the land leveling project and supporting projects in the demolition area. After the farmland slope protection project of the project adopted the above method, the implementation effect was good, human resources were saved, and the greening construction effect was obvious.

[0045] It should be understood that all the above embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present invention should be within the protection scope of the present invention.

Claims

1. A slope protection construction method, characterized in that: The following steps are involved: 1) Dig a guide ditch along the bottom of the slope; 2) Lay geotextile on the slope; 3) Lower the gabion boxes layer by layer in a step-like manner from the guide ditch, fill the lower gabion boxes with stones, twist the edges and seal the boxes before placing the upper gabion boxes; 4) After passing the inspection, carry out partial backfilling and greening planting; Before lowering the gabion boxes, support tools are placed at intervals along the arrangement direction of the gabion boxes. The support tools are fixed in the guide ditch or on the top of the gabion boxes in the lower layer, and are used to support the sides of the gabion boxes. The support tools are recovered after filling with stones. The supporting tool comprises an angle steel, a side plate, a plug rod and a locking piece, one end of the plug rod is vertically fixed to an inner surface of the middle part of the angle steel, and the other end is set to a pointed end, the side plate is vertically fixed to the middle part of an edge of the angle steel, and the side plate and the plug rod are at a right angle to each other, a total of four strip holes are opened on the angle steel on different surfaces on both sides of the plug rod along the length direction, the aforementioned locking piece is arranged in the strip hole, the locking piece comprises a clamping plate, a screw rod vertically fixed to the clamping plate, and an adjusting nut threadedly connected to the screw rod, the clamping plate is located on the outer side of the angle steel, the width of the strip hole is greater than the width of the clamping plate but less than the length of the clamping plate, the screw rod passes through the strip hole, the adjusting nut is located on the inner side of the angle steel, and its size is greater than the width of the strip hole; When the support tool is used in the guide ditch, the tip of the insertion rod is fixedly inserted in the guide ditch and supported on the side of the gabion box, the side plate faces away from the gabion box, and the card plate close to the gabion box is stuck in the mesh of the gabion box; When the supporting tool is used for the lower gabion box, the side plate faces away from the upper gabion box and is placed on the top of the lower gabion box, the insertion rod faces upward and is supported on the side of the gabion box, and the clamping plates on the two surfaces of the angle steel are respectively clamped in the meshes of the upper and lower gabion boxes; The support tool also includes a connection seat, which is two nuts in the same axial direction, the two nuts are fixedly connected to the inner surface of the angle steel and the insertion rod parallel to each other, and the end of the insertion rod is threadedly connected to the two; The locking piece also includes a connecting nut, which is fixed on the clamping plate. The screw rod is threadedly connected to the connecting nut. The thickness of the regular hexagonal nut of the connecting nut is not greater than the depth of the strip hole, and the spacing between the two parallel side surfaces is equal to the width of the strip hole.

2. The slope protection construction method according to claim 1, characterized in that: The guide ditch is excavated by an excavator and leveled manually.

3. The slope protection construction method according to claim 1, characterized in that: The geotextile was held down with sand bags during laying.

4. The slope protection construction method according to claim 1, characterized in that: Before the gabion boxes are lowered, they are assembled first, and then connected and tied between the boxes. When assembling the gabion boxes, the spacer net and the net body should intersect at 90 degrees, and a rectangular box group is formed by tying. The adjacent frame lines between the spacer net and the net body are connected by a combination line, and the combination line connection is to use a binding line - a single circle around a hole and a double circle around a hole, and twisted alternately. When connecting and tying between the boxes, the upper and lower corners of the adjacent boxes are tied once, the upper and lower frame lines or fold lines are tied once every 25cm, and the mesh joint surface is tied at 2 places per square meter. After the exposed parts of the mesh are filled with stones 1 / 3 high each time, a tensioning line is set, and the mesh is tightened and fixed inward in an eight-shaped shape.

5. The slope protection construction method according to claim 2, characterized in that: The filling stones are filled in layers, and the thickness of each layer is less than 30 cm.

6. The slope protection construction method according to claim 1, characterized in that: Before the greening planting, the top of the gabion box is filled with loam to a height of 5 to 10 cm.

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