Construction method of anchor rod lattice beam slope scaffold

Abstract

The present application relates to a kind of anchor rod lattice beam slope scaffold's construction method, comprising the following construction steps: 1) slope layering excavation;2) scaffold foundation;3) scaffold arrangement;4) inclined cross bar installation;5) operating layer laying;6) wall connecting piece and passage setting;The anchor rod lattice beam slope scaffold's construction method provided by the present application, structure specification is simple, easy to assemble and disassemble and good in applicability, by using the double-row structure of inner vertical rod and outer vertical rod, inclined cross bar is used to connect inner vertical rod and outer vertical rod, and wall connecting piece is set in the inside of scaffold, so that inner vertical rod is pulled together with anchor rod embedded in slope by wall connecting piece, can guarantee the stability of scaffold body, improve the security of high and steep slope operation.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a construction method for anchored grid beam slope scaffolding. Background Technology

[0002] With the development of infrastructure construction in my country, mountain construction and infrastructure projects are increasing, and the construction of steep slopes is becoming more and more common. During the construction of slope support systems such as anchor-rod grid beams, the safety and operation of scaffolding are particularly important due to the steepness of the slopes. Regarding the installation and construction of scaffolding in the process of steep slope support, compared with ordinary scaffolding, the installation of scaffolding for steep slope support is more complex, and safety, stability, and applicability are key to the management of this type of project. Existing scaffolding for steep slope support is mostly single-row, with very few using double-row scaffolding. This results in poor overall stability and anti-overturning capacity, and the safety of working at heights cannot be effectively guaranteed. Furthermore, the difficulty of erecting scaffolding on steep slopes also affects the construction work on these slopes. Summary of the Invention

[0003] The purpose of this invention is to provide a construction method for anchored grid beam slope scaffolding that is simple in structure, easy to assemble and disassemble, has good applicability, and is highly safe.

[0004] The technical solution of this invention is a construction method for anchored grid beam slope scaffolding, comprising the following construction steps:

[0005] (1) Layered excavation of slope

[0006] According to the design requirements, the excavation shall be carried out in layers, with each layer excavation height not exceeding 2.5m. After descending to 0.3m below the anchor rods, the anchor rods shall be installed to form the tie points of the wall ties. The next layer of soil shall be excavated 48 hours after the anchor rods are grouted.

[0007] Based on the arrangement of the scaffold wall ties, soil nails are driven into the locations where wall ties are missing to serve as tie points for the wall ties, so that the wall ties in the opposite positions can be welded to the soil nails.

[0008] (2) Scaffolding foundation

[0009] After the layered excavation is completed, the base is cleared and leveled, and the slope protection grid beam foundation is poured. The thickness of the grid beam foundation is about 100mm.

[0010] The concrete foundation is set with an outward slope of about 1%, and drainage facilities are installed on the concrete foundation to ensure that the scaffolding foundation is not soaked in water;

[0011] (3) Scaffolding arrangement

[0012] The scaffolding uprights are arranged on the scaffolding base, using a double-row frame structure consisting of inner and outer uprights; according to the distance between the scaffolding and the slope, diagonal crossbars are installed on the upper part of the inner uprights, and a first pad is set at the bottom of the inner uprights to ensure the distance between the inner uprights and the slope.

[0013] Install horizontal and vertical sweeping bars at the bottom of the inner uprights. Connect the horizontal and vertical sweeping bars to the inner and outer uprights using swivel fasteners to form a grid. Then install the first horizontal and first vertical horizontal bars to form a stable structure.

[0014] After installation, extend the inner uprights longitudinally along the slope, and install the outer uprights, horizontal sweeping rods, longitudinal sweeping rods, first-stage horizontal horizontal rods, and first-stage longitudinal horizontal rods one span at a time.

[0015] When arranging scaffold uprights, a first pad is set at each upright position, and the first pad is anchored to the concrete foundation with expansion bolts. The upright abuts against the first pad. The angle formed between the bottom of the upright and the first pad is tightened with wooden wedges, and the wooden wedges are fixed to the first pad with cement nails.

[0016] (4) Installation of diagonal crossbars

[0017] The end of the diagonal crossbar connected to the second pad is vertically pressed against the slope surface, and then the diagonal crossbar is fixed to the inner and outer uprights using cross fasteners.

[0018] (5) Laying of the operating layer

[0019] Install horizontal bars on the uprights, install longitudinal bars on the horizontal bars, lay scaffold boards, and install handrails on the outside of the scaffold boards.

[0020] (6) Installation of wall ties and passageways

[0021] Wall ties are installed on the inside of the scaffolding. The wall ties are welded to the anchor rods or the pre-set soil nails. The inner uprights are connected to the anchor rods or soil nails through the wall ties.

[0022] The zigzag diagonal bracing at the end of the scaffolding is connected to the inner and outer uprights at the end of the scaffolding. Vertical scissor bracing is installed every 15m along the outer side of the outer upright, and the width of the scissor bracing is not less than 4 spans.

[0023] Access points are set up on both sides of the scaffolding, allowing entry from the side of the slope.

[0024] Preferably, the wall tie in step (6) includes an inner wall tie rod, an outer wall tie rod, and a steel pipe. The inner wall tie rod is pre-embedded in the slope and welded to the anchor rod. A tapered sleeve is installed at one end of the inner wall tie rod near the slope surface. One end of the outer wall tie rod is threaded to the inner wall tie rod through the tapered sleeve. The other end of the outer wall tie rod is welded to the steel pipe. Then, a steel pipe fastener is used to connect the steel pipe to the inner upright rod, thereby connecting the inner upright rod to the anchor rod through the wall tie.

[0025] Preferably, during the construction of the lattice beam structure, templates and reinforcing timber back ribs are provided on the slope surface. The outer rod of the wall tie avoids the reinforcing timber back ribs and passes through the template before being threadedly connected to the inner rod of the wall tie. When the template is removed, the outer rod of the wall tie is temporarily removed first. After the template is removed, the outer rod of the wall tie is installed on the inner rod of the wall tie. When the wall tie is removed, the outer rod of the wall tie is removed first, then the conical sleeve is taken out, and finally the hole left by the conical sleeve is sealed with cement mortar.

[0026] As a preferred option, in step (3), the scaffolding is arranged with a longitudinal spacing of about 1.5m, a transverse spacing of about 1.05m, a height step distance between 1.8-2.0m, an oblique layout of no more than 2.2m, and a total height of no more than 15m.

[0027] Preferably, in step (4), one end of the diagonal crossbar is connected to a second pad, and the diagonal crossbar is vertically supported on the slope surface of the slope through the second pad; the second pad is provided with a number of nails, one end of the nails is inserted into the second pad, and the other end is inserted into the diagonal crossbar.

[0028] Preferably, in step (5), when the slope angle θ is greater than 65 degrees, the handrail is installed on the outer upright; when the slope angle θ is less than 65 degrees, guardrail uprights are first added to the diagonal crossbar and the outer upright, and then the handrail is installed on the guardrail uprights.

[0029] As a preferred option, in step 6, an upper and lower passage is set in the middle of the scaffold, and safety belt suspension points are set at 1m intervals on both sides of the scaffold.

[0030] Compared with existing technologies, the construction method of the anchored grid beam slope scaffolding provided by this invention is simple in structure, convenient in assembly and disassembly, and has good applicability. By adopting a double-row structure of inner and outer uprights, and using diagonal crossbars to connect the inner and outer uprights, and setting wall ties on the inner side of the scaffolding, the inner uprights are connected to the anchors embedded in the slope through the wall ties, which can ensure the stability of the scaffolding structure and improve the safety of high and steep slope operations. The wall ties are constructed with the outer and inner rods of the wall ties being threadedly connected, which makes the wall ties easy to assemble and disassemble, further improving the convenience of scaffolding assembly and disassembly. By setting the first pad at the arrangement position of the scaffolding uprights, and using expansion bolts to anchor the wooden pads to the concrete foundation, the scaffolds can resist the lateral sliding force of the uprights. The angle between the bottom of the upright and the first pad is tightened with wooden wedges to ensure uniform force distribution at the bottom end of the upright, which further improves the overturning resistance, load-bearing capacity, and tensile strength of the scaffolding. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of one embodiment of the anchored grid beam slope scaffolding of the present invention;

[0032] Figure 2 This is a schematic diagram of the connection structure between the wall tie and the anchor rod of the present invention;

[0033] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0034] Figure 4 yes Figure 2 Enlarged view of a section at point B in the middle;

[0035] Figure 5 yes Figure 2 Enlarged view of a section at point C;

[0036] Figure 6 yes Figure 2 Enlarged view of a section at point D;

[0037] Figure 7 yes Figure 2 Enlarged view of a section at point E in the middle;

[0038] Figure 8 yes Figure 7 Another perspective illustration;

[0039] Figure 9 yes Figure 2 A schematic diagram of another embodiment at point E;

[0040] Figure 10 This is a schematic diagram of the wall tie and soil nail connection structure of the present invention;

[0041] Figure 11 yes Figure 10Schematic diagram of the structure of the soil nail;

[0042] Figure 12 yes Figure 11 Another perspective illustration;

[0043] Figure 13 This is a structural schematic diagram of another embodiment of the anchored grid beam slope scaffolding of the present invention;

[0044] Figure 14 This is a schematic flowchart of the construction method for the anchored grid beam slope scaffolding of the present invention.

[0045] Explanation of key component symbols:

[0046] Scaffolding 1; Uprights 11; Inner uprights 111; Outer uprights 112; Swivel couplers 113; Cross couplers 114; Diagonal horizontal bars 12; Second pads 121; Nails 122; Horizontal ground bracing 13; Longitudinal ground bracing 14; Wall ties 15; Inner wall tie 151; Outer wall tie 152; Steel pipe wall tie 153; Conical sleeves 154; Steel pipe couplers 155; Zigzag diagonal braces 16; Horizontal bars 17; Horizontal horizontal bars 171; Longitudinal horizontal bars 172; Scaffold boards 18; Handrails 19; Guardrail uprights 191;

[0047] 2. Slope; 21. Anchor bolt; 22. Soil nail; 221. Steel pipe head; 222. Barb; 223. Grouting hole; 23. Slope surface; 24. Formwork; 25. Reinforcing timber back rib;

[0048] 3. Concrete foundation; 31. First pad; 32. Expansion bolt; 33. Wooden wedge; 34. Cement nail; 35. Drainage ditch;

[0049] 4. Lattice beam foundation;

[0050] 5. Cement mortar. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings:

[0052] Please see Figures 1 to 13As shown, the present invention provides an anchored grid beam slope scaffold 1, comprising: vertical uprights 11, diagonal horizontal bars 12 perpendicular to the uprights 11, and horizontal and vertical ground-level bars 13 and 14 installed at the bottom of the uprights 11. The uprights 11 include inner uprights 111 and outer uprights 112. The horizontal and vertical ground-level bars 13 and 14 are connected to the inner and outer uprights 111 and 112 by swivel couplers 113. The diagonal horizontal bars 12 are connected to the inner and outer uprights 111 and 112 by cross couplers 114. The inner uprights 111 are connected to anchors 21 embedded in the slope 2 by wall ties 15. The wall ties 15 include inner wall tie bars 151. The wall tie includes an outer rod 152 and a steel pipe 153. The inner rod 151 is embedded in the slope 2 and welded to the anchor rod 21. One end of the outer rod 152 is threadedly connected to the inner rod 151 via a tapered sleeve 154, and the other end is connected to the steel pipe 153. The steel pipe 153 is connected to the inner upright 111 via a steel pipe fastener 155. The tapered sleeve 154 is used to connect the outer rod 152 and the inner rod 151, which facilitates the temporary removal and reinstallation of the outer rod 152. The tapered shape of the sleeve 154 also facilitates its installation and removal.

[0053] The anchored grid beam slope scaffolding provided by this invention adopts a double-row structure of inner and outer uprights, which are connected by diagonal crossbars. Wall ties are installed on the inner side of the scaffolding, so that the inner uprights are connected to the anchors embedded in the slope through the wall ties, which ensures the stability of the scaffolding structure and improves the safety of high-altitude operations. Since the wall ties are constructed with the outer and inner rods of the wall ties being threadedly connected, the wall ties are easy to assemble and disassemble, further improving the convenience of scaffolding erection and dismantling.

[0054] For preference, please refer to Figure 2 , Figure 6 As shown, each position of the upright 11 is provided with a first pad 31. The first pad 31 is anchored to the concrete foundation 3 by expansion bolts 32, and the upright 1 abuts against the first pad 31. Specifically, the first pad is made of 150*150*18mm plywood and is anchored to the concrete foundation 3 by M10 expansion bolts to resist the oblique lateral sliding force of the upright 1.

[0055] For further information, please refer to [link / reference]. Figure 6 As shown, the angle formed between the bottom end face of the upright 1 and the first pad 31 is tightened by a wooden wedge 33. The wooden wedge 33 is fixed on the first pad 31 by cement nails 34. By setting the wooden wedge 33 between the bottom end face of the upright 1 and the first pad 31, it is ensured that the bottom end face of the upright 1 is subjected to uniform force.

[0056] It is worth noting that, such as Figure 10As shown, the axial force N of the uprights is calculated using the slope angle θ and the uprights themselves. The axial force N of the uprights can be calculated from the weight of the scaffold itself. According to the formula F=N*cosθ, the design value of the lateral horizontal force F can be calculated. To maintain balance between the uprights and the foundation, it is necessary to ensure that the anti-slip force in the actual horizontal force direction is greater than the design value of the lateral horizontal force F. Therefore, by setting the first pad at the upright arrangement position and setting the wooden wedge between the bottom end face of the upright and the first pad, the oblique lateral sliding force of the uprights can be effectively resisted and the force on the bottom end face of the uprights can be ensured to be uniform.

[0057] For preference, please refer to Figure 2 , Figure 7 , Figure 9 As shown, one end of the diagonal crossbar 12 is connected to a second pad 121, and the diagonal crossbar 12 is vertically supported on the slope surface 23 of the slope 2 through the second pad 121; the second pad 121 is provided with a number of nails 122, one end of the nails 122 is inserted into the second pad 121, and the other end is inserted into the diagonal crossbar 12.

[0058] Specifically, the second pad 121 is made of a 150*150*18mm shelf, such as Figure 7 , Figure 8 As shown, three 5cm nails are driven into the second pad 121, or as... Figure 9 As shown, a 5cm nail is driven into the middle of the second pad 121, with the nail driven into the second pad 121 for 10-15mm. The exposed part of the nail head is inserted into the diagonal crossbar 12, thereby connecting the second pad 121 with the diagonal crossbar 12 and preventing the second pad 121 from loosening or sliding.

[0059] Preferably, vertical scissor bracing (not shown in the figure) is installed every 15m along the outer longitudinal direction of the outer upright 112, and the width of the scissor bracing is not less than 4 spans.

[0060] For preference, please refer to Figure 2 As shown, the end of the scaffold 1 is provided with a zigzag diagonal brace 16, which is connected to the inner upright 111 and the outer upright 112 located at the end of the scaffold 1.

[0061] For preference, please refer to Figure 10 As shown, soil nails 22, such as reinforced soil nails or steel pipe soil nails, are pre-embedded between the anchor rods 21 to serve as tie points for the wall ties 15. The wall ties 15, positioned opposite each other, are welded to the soil nails 22. By adding reinforced soil nails or steel pipe soil nails, the anchor rods are replaced in places where there are no anchor rods 21 to serve as the tie points for the wall ties. Reinforced soil nails or steel pipe soil nails have a much lower stress performance than anchor rods, and the construction is also simpler.

[0062] Specifically, in one example, the following is used: Figure 11 , Figure 12The steel pipe soil nail 22 shown has a pointed cone-shaped head welded to the head 221 of the steel pipe to facilitate driving it into the soil. Half of the steel pipe is welded with steel bars or angle steel barbs 222. The barbs 222 are symmetrically welded along the circumference of the steel pipe. The barbs 222 are arranged near the head 221 of the steel pipe. A grouting hole 223 is set behind the barbs 222.

[0063] For preference, please refer to Figure 1 As shown, a horizontal bar 17 is installed on the upright 11. The horizontal bar 17 includes a transverse horizontal bar 171 and a longitudinal horizontal bar 172 installed on the transverse horizontal bar 171. Scaffold boards 18 are laid on the transverse horizontal bar 171 and the longitudinal horizontal bar 172 to form a slope construction operation platform.

[0064] For further information, please refer to [link / reference]. Figure 1 As shown, a handrail 19 is installed on the outside of the scaffold board 18. When the slope angle θ is greater than 65 degrees, the handrail 19 is installed on the outer upright 112; when the slope angle θ is less than 65 degrees, as shown... Figure 13 As shown, guardrail posts 191 are first added to the diagonal horizontal bar 12 and the outer vertical bar 112, and then handrail posts 19 are installed on the guardrail posts 191.

[0065] Please see Figure 14 As shown, the present invention also provides a construction method for anchored lattice beam slope scaffolding, including the following construction steps:

[0066] (1) Layered excavation of slope

[0067] According to the design requirements, the excavation shall be carried out in layers, with each layer excavation height not exceeding 2.5m. After descending to 0.3m below the anchor rods, the anchor rods 21 shall be installed to form the tie points of the wall ties 15. The next layer of soil shall be excavated 48 hours after the anchor rods 21 are grouted.

[0068] Based on the layout of the scaffolding wall ties, it is determined by calculation. It is generally recommended to use a two-step, two-span layout, that is, to set one wall tie every two horizontal and vertical intervals, or to use a two-step, three-span layout.

[0069] For locations lacking wall ties 21, soil nails 22, such as reinforced soil nails or steel pipe soil nails, are driven. By adding reinforced soil nails or steel pipe soil nails, they replace anchor rods as the ties in locations without anchor rods. Reinforced soil nails or steel pipe soil nails have much lower stress performance than anchor rods, and their construction is also simpler.

[0070] It should be noted that the scaffolding erection height is determined based on the single concrete pouring height of the lattice beam, and must meet the safety requirements for the maximum height of layered excavation. The total height of a single layered excavation is determined based on design calculations or a specific plan.

[0071] (2) Scaffolding foundation

[0072] After the layered excavation is completed, the base is cleared and leveled, and the slope support grid beam foundation 4 is poured. The grid beam foundation 4 is made of C20 concrete with a thickness of about 100mm.

[0073] The concrete foundation 3 is set with an outward slope of about 1%, and drainage facilities such as drainage ditch 35 are set on the concrete foundation 3 to ensure that the scaffold foundation is not soaked in water.

[0074] (3) Scaffolding arrangement

[0075] After the scaffolding foundation is completed, proceed with the scaffolding arrangement. Please refer to [link / reference]. Figure 13 As shown, the longitudinal spacing of the scaffolding is approximately 1.5m (not shown in the figure), the transverse spacing d1 is approximately 1.05m, the height step distance h is between 1.8-2.0m, the diagonal layout d2 is no greater than 2.2m, and the total height of the scaffolding is no greater than 15m (not shown in the figure).

[0076] Arrange the scaffold uprights 11 on the scaffold foundation. According to the distance between the scaffold 1 and the slope 23, install the diagonal crossbars 12 on the upper part of the inner uprights 111. Set the first pad 31 at the bottom of the inner uprights 111 to ensure the distance between the inner uprights 111 and the slope 23.

[0077] A horizontal sweeping bar 13 and a vertical sweeping bar 14 are installed at the lower part of the inner upright bar 111. The horizontal sweeping bar 13 and the vertical sweeping bar 14 are connected to the inner upright bar 111 and the outer upright bar 112 through a rotating fastener to form a grid. The first horizontal horizontal bar 171 and the first vertical horizontal bar 172 are installed to form a stable structure.

[0078] After installation, extend the inner upright 111 longitudinally along the slope, and install the outer upright 112, the transverse sweeping bar 13, the longitudinal sweeping bar 14, the first transverse horizontal bar 171, and the first longitudinal horizontal bar 172 span by span.

[0079] When arranging the scaffolding uprights, a first pad 31 is set at the upright arrangement position. The first pad 31 is made of 150*150*18mm plywood and is anchored to the concrete foundation 3 with M10 expansion bolts 32 to resist the oblique lateral sliding force of the upright 11. The included angle between the bottom of the upright 11 and the first pad 31 is tightened with wooden wedges 33 and fixed to the first pad 31 with cement nails 34 to ensure that the end section of the upright 11 is subjected to uniform force.

[0080] (4) Installation of diagonal crossbars

[0081] One end of the diagonal crossbar 12, connected to the second pad 121, is vertically pressed against the slope surface 23 of the slope 2. The diagonal crossbar 12 is then fixed to the inner upright 111 and the outer upright 112 using cross-shaped fasteners 122. The second pad 121 is made of 150*150*18mm plywood. Figure 7 , Figure 8 As shown, three 5cm nails are driven into the second pad 121, or as... Figure 9 As shown, a 5cm nail is driven into the middle of the second pad 121, with the nail driven into the second pad 121 for 10-15mm. The exposed part of the nail head is inserted into the diagonal crossbar 12, thereby connecting the second pad 121 with the diagonal crossbar 12 and preventing the second pad 121 from loosening or sliding.

[0082] (5) Laying of the operating layer

[0083] Install a horizontal bar 171 on the upright 11, install a longitudinal horizontal bar 172 on the horizontal bar 171, and lay scaffold boards 18.

[0084] Handrails 19 are installed on the outside of the scaffold plank 18. When the slope angle θ is greater than 65 degrees, the handrails 19 are installed on the outer uprights 112. When the slope angle θ is less than 65 degrees, guardrails 191 are first added to the diagonal crossbars 12 and the outer uprights 112, and then the handrails 19 are installed on the guardrails 191.

[0085] (6) Installation of wall ties and passageways

[0086] During the scaffolding erection process, wall ties 15 are installed on the inner side of scaffolding 1. The arrangement of the wall ties is determined by calculation, generally in two steps and two spans or two steps and three spans. The wall ties 15 are made of short steel pipes and are welded to the anchor rods 21 for connection, or welded to the pre-set soil nails 22. The inner uprights 111 are connected to the anchor rods 21 or soil nails 22 through the wall ties 15.

[0087] A zigzag diagonal brace 16 is installed at the end of the scaffold 1. The zigzag diagonal brace 16 is connected to the upright 11. Vertical scissor braces are installed every 15m along the outer side of the outer upright 112. The width of the scissor braces is not less than 4 spans.

[0088] Access points (not shown in the figure) are set up on both sides of the scaffolding, allowing entry from the side of the slope; furthermore, access channels are set up in the middle of the scaffolding, and safety belt suspension points with a spacing of 1m are set up on both sides of the scaffolding.

[0089] For preference, please refer to Figures 3 to 5As shown, the inner rod 151 of the wall tie is pre-embedded in the slope 2 and welded to the anchor rod 21. A tapered sleeve 154 is installed at one end of the inner rod 151 near the slope surface 23. One end of the outer rod 152 of the wall tie is threaded to the inner rod 151 of the wall tie through the tapered sleeve 154. The other end of the outer rod 152 of the wall tie is welded to the steel pipe 153 of the wall tie. Then, the steel pipe fastener 155 is used to connect the steel pipe 153 of the wall tie to the inner upright rod 111, so that the inner upright rod 111 is connected to the anchor rod 21 through the wall tie 15.

[0090] Please see Figure 3 As shown, during the construction of the lattice beam structure, the slope 23 is provided with a template 24 for the formwork support before the concrete pouring of the lattice beam and a reinforcing timber back rib 25 located outside the template 24 for the formwork reinforcement before the concrete pouring of the lattice beam. The outer rod 152 of the wall tie avoids the reinforcing timber back rib 25 and passes through the template 24 before being threadedly connected to the inner rod 151 of the wall tie.

[0091] When dismantling formwork 24, the outer wall tie rod 152 is temporarily removed first. After the formwork 24 is dismantled, the outer wall tie rod 152 is then installed on the inner wall tie rod 151, thus forming a structure as shown. Figure 4 The state of the lattice beam formwork 24 after removal is shown.

[0092] When removing the wall tie 15, first remove the outer rod 152 of the wall tie, then remove the conical sleeve 154, and finally seal the hole left by the conical sleeve 154 with cement mortar 5, thus forming a... Figure 5 The wall ties shown are in their current state after removal.

[0093] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A construction method for anchored lattice beam slope scaffolding, comprising: (1) The slope is excavated in layers according to the design requirements, and anchor bolts are installed to form tie points for the wall components; its characteristic is that... In step (1), the excavation height in each layer is no more than 2.5m. After descending to 0.3m below the anchor rod, the anchor rod is installed. 48 hours after the anchor rod is grouted, the next layer of earthwork is excavated. According to the arrangement of the scaffold wall ties, soil nails are installed at the locations where there are no wall tie points to serve as tie points for the wall ties, so that the wall ties in the opposite positions can be welded to the soil nails. The construction method also includes the following steps: (2) Scaffolding foundation After the layered excavation is completed, the base is cleared and leveled, and the slope protection grid beam foundation is poured. The thickness of the grid beam foundation is 100mm. The concrete foundation is set with a 1% outward slope, and drainage facilities are installed on the concrete foundation to ensure that the scaffolding foundation is not soaked in water; (3) Scaffolding arrangement The scaffolding uprights are arranged on the foundation of the scaffolding. The longitudinal spacing of the scaffolding is 1.5m, the transverse spacing is 1.05m, the height step distance is between 1.8-2.0m, the diagonal layout is no more than 2.2m, and the total height of the scaffolding is no more than 15m. The scaffolding adopts a double-row frame structure consisting of inner uprights and outer uprights. According to the distance between the scaffolding and the slope, diagonal crossbars are installed on the upper part of the inner uprights, and the first pad is set at the bottom of the inner uprights to ensure the distance between the inner uprights and the slope. Install horizontal and vertical sweeping bars at the bottom of the inner uprights. Connect the horizontal and vertical sweeping bars to the inner and outer uprights using swivel fasteners to form a grid. Then install the first horizontal and first vertical horizontal bars to form a stable structure. After installation, extend the inner uprights longitudinally along the slope, and install the outer uprights, horizontal sweeping rods, longitudinal sweeping rods, first-stage horizontal horizontal rods, and first-stage longitudinal horizontal rods one span at a time. When arranging scaffold uprights, a first pad is set at each upright position, and the first pad is anchored to the concrete foundation with expansion bolts. The upright abuts against the first pad. The angle formed between the bottom of the upright and the first pad is tightened with wooden wedges, and the wooden wedges are fixed to the first pad with cement nails. (4) Installation of diagonal crossbars Based on the distance between the scaffolding and the slope, diagonal crossbars are installed on the upper part of the inner uprights. One end of the diagonal crossbar is connected to a second pad. The diagonal crossbar is vertically supported on the slope surface through the second pad. The diagonal crossbar is then fixed to the inner and outer uprights by cross couplers. The second pad is provided with several nails. One end of each nail is inserted into the second pad, and the other end is inserted into the diagonal crossbar, thereby connecting the second pad with the diagonal crossbar and preventing the second pad from loosening or sliding. (5) Laying of the operating layer Install horizontal bars on the uprights, install longitudinal bars on the horizontal bars, lay scaffold boards, and install handrails on the outside of the scaffold boards. (6) Installation of wall ties and passageways Wall ties are installed on the inside of the scaffolding. The wall ties are welded to the anchor rods or the pre-set soil nails. The inner uprights are connected to the anchor rods or soil nails through the wall ties. The zigzag diagonal bracing at the end of the scaffolding is connected to the inner and outer uprights at the end of the scaffolding. Vertical scissor bracing is installed every 15m along the outer side of the outer upright, and the width of the scissor bracing is not less than 4 spans. Access points are set up on both sides of the scaffolding, allowing entry from the side of the slope.

2. The construction method of the anchored grid beam slope scaffolding according to claim 1, characterized in that, The wall tie in step (6) includes an inner wall tie rod, an outer wall tie rod, and a wall tie steel pipe. The inner wall tie rod is pre-embedded in the slope and welded to the anchor rod. A tapered sleeve is installed at one end of the inner wall tie rod near the slope surface. One end of the outer wall tie rod is threaded to the inner wall tie rod through the tapered sleeve. The other end of the outer wall tie rod is welded to the wall tie steel pipe. Then, a steel pipe fastener is used to connect the wall tie steel pipe to the inner upright rod, thereby connecting the inner upright rod to the anchor rod through the wall tie.

3. The construction method of the anchored grid beam slope scaffolding according to claim 2, characterized in that, During the construction of the lattice beam structure, templates and reinforcing timber back ribs are installed on the slope surface. The outer rod of the wall tie avoids the reinforcing timber back ribs and passes through the template before being threadedly connected to the inner rod of the wall tie. When the template is removed, the outer rod of the wall tie is temporarily removed first. After the template is removed, the outer rod of the wall tie is installed on the inner rod of the wall tie. When the wall tie is removed, the outer rod of the wall tie is removed first, then the conical sleeve is taken out, and finally the hole left by the conical sleeve is sealed with cement mortar.

4. The construction method of the anchored lattice beam slope scaffolding according to claim 1, characterized in that, In step (5), when the slope angle θ is greater than 65 degrees, the handrail is installed on the outer upright; when the slope angle θ is less than 65 degrees, guardrail uprights are first added to the diagonal crossbar and the outer upright, and then the handrail is installed on the guardrail uprights.

5. The construction method of the anchored grid beam slope scaffolding according to claim 1, characterized in that, In step 6, an access passage is set up in the middle of the scaffold, and safety belt suspension points are set up on both sides of the scaffold at 1m intervals.

6. The construction method of the anchored grid beam slope scaffolding according to claim 1, characterized in that, The soil nail is a steel pipe soil nail. A pointed cone-shaped head is welded to the end of the steel pipe to facilitate driving it into the soil. Bars of steel bars or angle steel are welded to half of the length of the steel pipe. The barbs are symmetrically welded along the circumference of the steel pipe and are arranged near one end of the steel pipe head. A grouting hole is set behind the barbs.

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