Method for erecting overhanging scaffold on high and steep cliff near river

Abstract

The invention discloses a method for erecting an overhanging scaffold on a high and steep cliff near a river, which comprises the following steps of: erecting an overhanging platform as a main bearing structure of the self weight of the scaffold and various loads in the use process of the scaffold, erecting a bottom platform as a secondary bearing structure of a free part at the bottom of the scaffold, and erecting a bottom platform from top to bottom; scaffold main body frames are in lap joint from near to far, and after lap joint of the main body frames is completed, additional components are installed. According to the method for erecting the cantilever scaffold on the high and steep cliff near the river, the problems that when a conventional scaffold is erected on the high and steep cliff near the river from bottom to top, a riverway is occupied, and a site is narrow are solved; the problems of safety risks and possible water pollution caused by too high scaffold height when a conventional scaffold is erected from bottom to top are solved, and the erecting method is safe, reliable, fast, efficient, energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of scaffold construction of water conservancy projects, and in particular relates to a method for erecting a cantilever scaffold on a high and steep cliff near a river. Background Art

[0002] At present, in water conservancy, highway, railway and other construction projects, scaffolding is often set up as a construction platform when treating dangerous rock masses on steep cliffs. When using a ground-based scaffolding to set up scaffolding from the bottom up in high mountain canyons, it is often faced with the problem of cramped site and difficulty in rapid construction and the safety risk caused by the scaffolding being too high; when the steep cliff is adjacent to the river and there are hydropower infrastructures distributed upstream and downstream of the river, it is also necessary to consider the problem of scaffolding encroachment on the river, the water pollution that may be caused during the erection process, and the impact on the operation of upstream and downstream hydropower infrastructure after encroaching on the river. Therefore, there is an urgent need for a method of erecting cantilever scaffolding on steep cliffs near the river to solve the problems of cramped site, low construction efficiency, and high safety risks; at the same time, it avoids pollution of the river water, reduces the impact on upstream and downstream hydropower infrastructure, and meets environmental protection requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to safely and efficiently erect scaffolding on a high and steep cliff near a river without encroaching on the river channel, while meeting relevant environmental protection technical requirements.

[0004] The technical solution of the present invention is: A method for erecting a cantilever scaffolding on a steep cliff near a river comprises the following steps: Step 1: Setting up the cantilever platform, including the following steps: Step 1.1, leveling the arch base platform: level the arch base platform as a whole: first chisel off the raised part, then pour C15 concrete to form a concrete platform; lay horizontal I-beams on the concrete platform at intervals of 1.5m, and pour concrete to seal the gap on the outside of the cliff; Step 1.2, I-beam fixing and supporting: The platform part where the horizontal I-beam is located is fixed firmly to the platform through anchor rod A; the bottom of the part of the horizontal I-beam facing the air is welded and fixed to the I-beam column and one end of the I-beam diagonal brace, and the other end of the I-beam column and the I-beam diagonal brace is fixed to the mountain; the end of the horizontal I-beam is fixed to the arch seat by steel strands, and the arch seat is located at the top of the mountain; Step 1.3, overall reinforcement: lay angle irons at a 3m spacing on the top of the horizontal I-beams and fully weld them to the I-beams; Step 2: Setting up the bottom platform, including the following steps: Step 2.1, channel steel layout: one end of the horizontal section channel steel is fixedly connected to one end of a steel bar A with a slope of 15° to 30°, and the other end of the steel bar A is fixedly connected to an anchor rod B, and the anchor rod B is inserted obliquely upward into the mountain to be fixed firmly; the other end of the horizontal section channel steel is welded and fixed to the exposed section of the anchor rod C, and the connection between the horizontal section channel steel and the anchor rod C is provided with a steel bar B; the anchor rod C is connected to one end of the anchor rod D, and the other end of the anchor rod D is inserted into the mountain to be fixed firmly; Step 2.2, channel steel diagonal brace setting: a channel steel diagonal brace is set at the bottom of the horizontal section channel steel; one end of the channel steel diagonal brace is connected to the horizontal section channel steel, and the other end of the channel steel diagonal brace is inserted into the mountain to form a stable bottom support system; Step 3: Main frame lap joint, including the following steps: Step 3.1, scaffolding row and step setting: use 48.3×3.6mm steel pipes for scaffolding, with horizontal distance, vertical distance and step distance of 1.5m, 1.5m and 1.7m respectively; lay the first row of large and small crossbars on the horizontal I-beam close to the cantilever platform; Step 3.2, connecting the vertical poles with the bottom platform: setting a number of vertical poles and connecting and fixing them with the first row of large cross bars and small cross bars, the vertical poles and the large cross bars are fixedly connected in a vertical and cross manner, the vertical poles and the small cross bars are fixedly connected in a vertical and cross manner, and the large cross bars and the small cross bars are fixedly connected in a vertical and cross manner; the bottom ends of some vertical poles are fixedly connected with the bottom platform, and the bottom ends of the other vertical poles are fixedly connected with the mountain body, the bottom ends of the vertical poles are also provided with a longitudinal sweeping rod and a transverse sweeping rod, the longitudinal sweeping rod is fixedly connected with the bottom ends of the vertical poles in a vertical and cross manner; the rod body of the transverse sweeping rod is fixedly connected with the bottom ends of the vertical poles in a vertical and cross manner, and one end of the transverse sweeping rod is inserted into the mountain body and fixed firmly; Step 3.3, layer-by-layer erection and wall tie setting: gradually erect large crossbars and small crossbars from top to bottom and from near to far; when erecting to the main node with wall ties, immediately set up the wall ties and fix the wall ties with the large crossbars and small crossbars in a "two-step three-span" arrangement; Step 3.4: Setting up the scissor braces and pedestrian passage: After the large crossbar and the small crossbar are erected, the scissor braces are continuously set up on the facade of the frame, wherein the inclination angle of the diagonal bars of the scissor braces should be between 45° and 60°; then, the pedestrian passage is set up according to the use requirements, arranged in a zigzag shape, and a rest platform with a width of not less than 1m is set up at the corners. The overall slope of the passage is not greater than 1:3, and the bottom of the pedestrian passage is fixedly connected to the large crossbar and the small crossbar; Step 4: Additional component installation, including the following steps: Step 4.1, scaffolding and protective facilities are set up: bamboo springboards are selected as scaffolding boards for laying, the scaffolding boards are laid on large crossbars and small crossbars, and footboards are set on the outside of the scaffolding boards; dense mesh nets are set on the inside of the outer poles of the scaffolding, and the dense mesh nets are firmly tied to the rods with lead wire; Step 4.2, Inspection and Acceptance: After the installation of additional components is completed, all connection points, welds, and anchors should be thoroughly inspected to ensure that the overall structure is stable, safe and reliable. Only after confirmation can the cantilever scaffolding be put into use.

[0005] Furthermore, when the horizontal I-beam in step 1 is extended, the joints are reinforced with a steel plate of not less than 50 cm in length and 16 mm in thickness, and the joints are staggered and arranged at the anchor points of the anchor rods, and steel plates are welded at the parts with large gaps at the joints.

[0006] Furthermore, when the anchor rod A in the step 1.2 is used to anchor the horizontal I-beam, the anchor rod A is arranged symmetrically on the left and right sides of the horizontal I-beam, that is, two anchor rods A are arranged at one anchor point, and the portion of the anchor rod A that is higher than the horizontal I-beam is cold-bent and then welded to the horizontal I-beam, and the anchor points are arranged at a spacing of 2m.

[0007] Furthermore, the I-beam column in step 1.2 is welded at a distance of 6m from the end of the horizontal I-beam, one end of the I-beam brace is welded at a distance of 3m from the end of the horizontal I-beam, the other end of the I-beam brace is welded to the I-beam column, and the bottom of the I-beam column is reinforced with reinforcing anchor rods. If the I-beam column does not have the construction conditions, the I-beam brace is used for support and the bottom of the I-beam brace is also reinforced with reinforcing anchor rods. One end of the reinforcing anchor rod is fixedly connected to the bottom of the I-beam column or the I-beam brace, and the other end of the reinforcing anchor rod is firmly fixed to the inserted mountain.

[0008] Furthermore, the steel strand obliquely fixed method in step 1.2 is specifically as follows: the ends of 3 to 5 horizontal I-beams are first tied with the steel strands and then the steel strands are obliquely pulled to the dowel anchor rods at the top of the arch seat for fixed connection.

[0009] Furthermore, the large cross bar, small cross bar and vertical poles are extended by connecting with butt fasteners or rotating fasteners adapted to the size of the poles; the large cross bar, small cross bar and vertical poles are connected to each other by right-angle fasteners adapted to the size of the poles; the diagonal poles of the scissors struts are extended and connected to the vertical poles by rotating fasteners adapted to the size of the poles.

[0010] Furthermore, when the vertical poles begin to be erected in step 3, a guy is set every 6 spans, and it can only be removed after the wall connection parts are firmly installed.

[0011] Furthermore, in step 3.2, part of the vertical poles are fixedly connected to the mountain through the inserted reinforcement, the bottom end of the part of the vertical poles is fixedly connected to one end of the inserted reinforcement, and the other end of the inserted reinforcement is inserted into the mountain and fixed firmly.

[0012] Furthermore, the wall connection member is formed by connecting a C25 anchor rod and a φ10 steel bar, the steel bar on the wall connection member is connected to a scaffolding rod body, and the anchor rod on the wall connection member is inserted into the rock for 3m.

[0013] Furthermore, some of the wall connecting members are steel rope anchors.

[0014] Beneficial effects of the present invention: 1. Multiple anchoring at the cantilever and bottom, high overall stability: The horizontal I-beam and anchor rod, I-beam column, I-beam diagonal brace and steel strand of the present invention work together to ensure the overall stability of the cantilever platform in a high and steep cliff environment; the bottom platform adopts channel steel, diagonal brace and anchor rod to form a solid support foundation, so that the lower part of the scaffolding can also obtain reliable force support; the multi-level anchoring and support arrangement effectively avoids the risk of instability or excessive local force caused by a single point or a small amount of support, and the overall safety factor is high; 2. Step-by-step erection, enhanced construction controllability and safety: The present invention first erects the cantilever platform, then the bottom platform, and finally the main frame and auxiliary components, advancing layer by layer in the order of "from top to bottom, from near to far", and the construction process is clear and safe and controllable; when the main frame is erected, a guy prop is first set at a certain span, and the guy prop is removed after the wall connection parts are firmly installed. This progressive and segmented construction method can effectively reduce the safety risks brought by large-scale simultaneous operations at high altitudes; 3. The connection mode of anchor rods, I-beams and fasteners is flexible and has strong adaptability: when the horizontal I-beams of the present invention are extended, thick steel plates are used for reinforcement and staggered arrangement. Steel plates can also be welded at the joints according to the size of the gap, thereby enhancing the bearing capacity and torsional and bending resistance of the component interface; standard fasteners (butt fasteners, right-angle fasteners, rotating fasteners, etc.) are used to connect the vertical poles, large cross bars and small cross bars, which can flexibly adjust the length and arrangement of the poles according to the on-site conditions, and are also convenient for later disassembly or modification; 4. Multi-point anchoring layout and steel strand diagonal pulling greatly improve the anti-overturning ability: The present invention adopts the left-right symmetrical arrangement of anchor rods A for the horizontal I-beam, and introduces steel strands at the end to be diagonally pulled to the top of the arch seat for anchoring, which greatly improves the cantilever end's resistance to the external pulling overturning force; the I-beam column and the diagonal brace are arranged at a certain position away from the end, and the reinforced anchor rod or the bottom of the diagonal brace is also reinforced to form a complete "upper pull, lower support, rear anchor" force system, and the overall anti-overturning ability is significantly enhanced; 5. The pedestrian passage and safety protection design are perfect, and the safety of construction and users is guaranteed: the pedestrian passage is reasonably arranged in a zigzag shape, and a rest platform of no less than 1m width is set at the corner, and the overall slope of the passage is controlled to be no more than 1:3, which reduces the fatigue and safety risks of workers when walking up and down; scaffolding boards, footboards, dense mesh and other protective devices are complete, and with poles, sweeping poles, etc., the anti-fall and anti-material falling measures are more complete; 6. Strong operability in places with large height differences and complex terrain, and adaptable to various construction environments: The present invention reliably transmits the force path of the scaffolding to the stable rock and soil by laying anchor rods, inserted bars, steel strands, etc. on the mountain or rock layer, and is suitable for complex terrain environments such as river cliffs, high ridges, and cliffs; the construction method of the present invention has clear steps, and the preliminary pretreatments such as rock surface chiseling and leveling and concrete platform pouring are conducive to the positioning and installation of subsequent support components, providing a feasible way for construction in complex environments; In summary, the present invention realizes the safe erection and stable support of scaffolding in high and steep terrain, and has high reliability, construction convenience and operability. Its multiple anchoring and step-by-step erection method effectively improves the safety of high-altitude operations, and while meeting the needs of construction, it can adapt to terrain changes, reduce construction risks and costs, and has significant engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 The invention discloses a cantilever scaffolding structure schematic diagram of a cantilever scaffolding erection method on a high and steep cliff near a river.

[0017] Figure 2 The invention discloses a side structural schematic diagram of a cantilever scaffolding for erecting a cantilever scaffolding on a high and steep cliff near a river.

[0018] Figure 3 The invention discloses a schematic diagram of a bottom platform structure of a method for erecting a cantilever scaffolding on a high and steep cliff near a river.

[0019] Figure 4 The invention discloses a structural schematic diagram of additional components of a method for erecting a cantilever scaffold on a high and steep cliff near a river.

[0020] Figure 5 The invention discloses a schematic diagram of a main frame structure of a cantilever scaffolding according to a method for erecting a cantilever scaffolding on a high and steep cliff near a river.

[0021] Figure 6 The invention is a structural schematic diagram of an anchor rod A in a method for erecting a cantilever scaffold on a high and steep cliff near a river.

[0022] In the figure: 11-concrete platform, 12-horizontal I-beam, 13-anchor rod A, 14-I-beam column, 15-I-beam diagonal brace, 16-reinforcement anchor rod, 17-steel strand, 18-inserted anchor rod, 19-arch seat, 20-angle iron, 21-horizontal section channel steel, 22-rebar, 23-anchor rod B, 24-anchor rod C, 25-channel steel diagonal brace, 26-anchor rod D, 27-rebar, 31-large cross bar, 32-small cross bar, 33-vertical rod, 34-wall connecting piece, 35-longitudinal sweeping rod, 36-transverse sweeping rod, 37-scissors brace, 38-inserted reinforcement, 39-pedestrian passage, 41-scaffolding board, 42-high footboard, 43-dense mesh. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only 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.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1-6 As shown, a method for erecting a cantilever scaffolding on a steep cliff near a river comprises the following steps: Step 1: Setting up the cantilever platform, including the following steps: Step 1.1, leveling the arch base platform: level the arch base platform as a whole: first chisel off the raised part, then pour C15 concrete to form a concrete platform 11; lay horizontal I-beams 12 on the concrete platform 11 at intervals of 1.5m, and pour concrete to seal the gap on the outside of the cliff; Step 1.2, I-beam fixing and supporting: The part of the platform 11 where the horizontal I-beam 12 is located is fixed firmly to the platform 11 through the anchor rod A13; the bottom of the part of the horizontal I-beam 12 facing the air is welded and fixed to the I-beam column 14 and one end of the I-beam brace 15, and the other ends of the I-beam column 14 and the I-beam brace 15 are fixedly connected to the mountain; the end of the horizontal I-beam 12 is fixed to the arch seat 19 by the steel strand 17, and the arch seat 19 is located at the top of the mountain; Step 1.3, overall reinforcement: Angle iron 20 is laid on the top of the horizontal I-beam 12 at a spacing of 3m, and is fully welded to the I-beam 12; Step 2: Setting up the bottom platform, including the following steps: Step 2.1, channel steel layout: one end of the horizontal section channel steel 21 is fixedly connected to one end of the steel bar A22 with a slope of 15° to 30°, and the other end of the steel bar A22 is fixedly connected to the anchor rod B23, and the anchor rod B23 is inserted obliquely upward into the mountain to be fixed firmly; the other end of the horizontal section channel steel 21 is welded and fixed to the exposed section of the anchor rod C24, and a steel bar B27 is provided at the connection between the horizontal section channel steel 21 and the anchor rod C24; the anchor rod C24 is connected to one end of the anchor rod D26, and the other end of the anchor rod D26 is inserted into the mountain to be fixed firmly; Step 2.2, channel steel diagonal brace setting: a channel steel diagonal brace 25 is set at the bottom of the horizontal section channel steel 21; one end of the channel steel diagonal brace 25 is connected to the horizontal section channel steel 21, and the other end of the channel steel diagonal brace 25 is inserted into the mountain to form a stable bottom support system; Step 3: Main frame lap joint, including the following steps: Step 3.1, setting the row and step distance of the scaffolding: Use 48.3×3.6mm steel pipes for erection, with the horizontal distance, vertical distance and step distance being 1.5m, 1.5m and 1.7m respectively; first lay the first row of large crossbars 31 and small crossbars 32 on the horizontal I-beam 12 close to the cantilever platform; Step 3.2, connecting the vertical poles with the bottom platform: setting a plurality of vertical poles 33 and connecting and fixing them with the first row of large cross bars 31 and small cross bars 32, the vertical poles 33 and the large cross bars 31 are vertically and cross-fixedly connected in the longitudinal direction, the vertical poles 33 and the small cross bars 32 are horizontally and vertically and cross-fixedly connected, the large cross bars 31 and the small cross bars 32 are vertically and cross-fixedly connected; the bottom ends of some vertical poles 33 are fixedly connected to the bottom platform, and the bottom ends of the remaining vertical poles 33 are fixedly connected to the mountain body, the bottom ends of the vertical poles 33 are also provided with longitudinal sweeping rods 35 and transverse sweeping rods 36, the longitudinal sweeping rods 35 are vertically and cross-fixedly connected to the bottom ends of the vertical poles 33; the rod body of the transverse sweeping rod 36 is vertically and cross-fixedly connected to the bottom ends of the vertical poles 33, and one end of the transverse sweeping rod 36 is inserted into the mountain body and fixed firmly; Step 3.3, layer-by-layer erection and wall connection member setting: gradually erect the large crossbar 31 and the small crossbar 32 from top to bottom and from near to far; when the main node with the wall connection member 34 is erected, the wall connection member 34 is immediately set, and the wall connection member 34 is fixedly connected with the large crossbar 31 and the small crossbar 32 in a "two-step three-span" arrangement; Step 3.4: Setting up the scissor brace and pedestrian passage: After the large crossbar 31 and the small crossbar 32 are set up, the scissor brace 37 is continuously set up on the facade of the frame, wherein the inclination angle of the diagonal bar of the scissor brace 37 is preferably between 45° and 60°; then, the pedestrian passage 39 is set up according to the use requirements, arranged in a zigzag shape, and a rest platform with a width of not less than 1m is set at the corner, and the overall slope of the passage is not greater than 1:3, and the bottom of the pedestrian passage 39 is fixedly connected to the large crossbar 31 and the small crossbar 32; Step 4: Additional component installation, including the following steps: Step 4.1, scaffolding board and protective facilities are set: bamboo springboards are selected as scaffolding boards 41 for laying, the scaffolding boards 41 are laid on the large crossbars 31 and the small crossbars 32, and footboards 42 are set on the outside of the scaffolding boards 41; a dense mesh 43 is set on the inside of the scaffolding outer poles 33, and the dense mesh is firmly tied to the rods with lead wire; Step 4.2, Inspection and Acceptance: After the installation of additional components is completed, all connection points, welds, and anchors should be thoroughly inspected to ensure that the overall structure is stable, safe and reliable. Only after confirmation can the cantilever scaffolding be put into use.

[0026] Preferably, when the horizontal I-beam 12 in step 1 is extended, the joints are reinforced with a steel plate not less than 50 cm long and 16 mm thick, and the joints are staggered and arranged at the anchor points of the anchor rods, and steel plates are welded at the parts with large gaps at the joints.

[0027] Preferably, when the anchor rod A13 in the step 1.2 anchors the horizontal I-beam 12, the arrangement method of the anchor rod A13 is to arrange it symmetrically on the left and right sides of the horizontal I-beam 12, that is, two anchor rods A13 are arranged at one anchor point, and the part of the anchor rod A13 higher than the horizontal I-beam 12 is cold-bent and welded to the horizontal I-beam 12, and the anchor points are arranged at a spacing of 2m.

[0028] Preferably, the I-beam column 14 in the step 1.2 is welded at a distance of 6 m from the end of the horizontal I-beam 12, one end of the I-beam brace 15 is welded at a distance of 3 m from the end of the horizontal I-beam 12, the other end of the I-beam brace 15 is welded to the I-beam column 14, and the bottom of the I-beam column 14 is reinforced with a reinforcing anchor rod 16. If the I-beam column 14 does not have a location with construction conditions, the I-beam brace 15 is used for support and the bottom of the I-beam brace 15 is also reinforced with a reinforcing anchor rod 16. One end of the reinforcing anchor rod 16 is fixedly connected to the bottom of the I-beam column 14 or the I-beam brace 15, and the other end of the reinforcing anchor rod 16 is firmly fixed to the inserted mountain.

[0029] Preferably, the oblique fixing method of the steel strand 17 in step 1.2 is as follows: the ends of 3 to 5 horizontal I-beams 12 are first tied with the steel strand 17 and then the steel strand 17 is obliquely pulled to the dowel anchor rod 18 at the top of the arch seat 19 for fixed connection.

[0030] Preferably, the large cross bar 31, the small cross bar 32 and the vertical poles 33 are extended by connecting with butt fasteners or rotating fasteners adapted to the size of the rods; the large cross bar 31, the small cross bar 32 and the vertical poles 33 are connected to each other by right-angle fasteners adapted to the size of the rods; the diagonal rods of the scissors struts 37 are extended and connected to the vertical poles 33 by rotating fasteners adapted to the size of the rods.

[0031] Preferably, when the vertical poles 33 begin to be erected in step 3, a guy brace is set every 6 spans, and it can not be removed until the wall connecting member 34 is firmly installed.

[0032] Preferably, in step 3.2, part of the vertical poles 33 are fixedly connected to the mountain through the dowel 38, the bottom end of the part of the vertical poles 33 is fixedly connected to one end of the dowel 38, and the other end of the dowel 38 is inserted into the mountain and fixed firmly.

[0033] Preferably, the wall connecting member 34 is formed by connecting a C25 anchor rod and a φ10 steel bar, the steel bar on the wall connecting member 34 is connected to the scaffolding rod body, and the anchor rod on the wall connecting member 34 is inserted into the rock for 3m.

[0034] Preferably, some of the wall connecting members 34 are steel rope anchors.

[0035] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments and various changes can be made thereto within the knowledge scope of those skilled in the art.

Claims

1. A method for erecting a cantilever scaffolding on a steep cliff near a river, characterized in that: The following steps are involved: Step 1: Setting up the cantilever platform, including the following steps: Step 1.1, leveling the arch base platform: the arch base platform is leveled as a whole: first, the protruding part is chiseled off, and then C15 concrete is poured to form a concrete platform (11); horizontal I-beams (12) are laid on the concrete platform (11) at intervals of 1.5 m, and the gap on the outer side of the cliff is poured with concrete to seal the surface; Step 1.2, I-beam fixing and supporting: The portion of the platform (11) where the horizontal I-beam (12) is located is fixed firmly to the platform (11) by means of anchor rods A (13); the bottom of the portion of the horizontal I-beam (12) facing the air is fixed by welding to one end of the I-beam column (14) and the I-beam brace (15), and the other ends of the I-beam column (14) and the I-beam brace (15) are fixedly connected to the mountain; the end of the horizontal I-beam (12) is fixed by means of a steel strand (17) to an arch seat (19), and the arch seat (19) is located at the top of the mountain; Step 1.3, overall reinforcement: Angle irons (20) are laid on top of the horizontal I-beams (12) at a spacing of 3 m, and are fully welded to the I-beams (12); Step 2: Setting up the bottom platform, including the following steps: Step 2.1, channel steel layout: one end of the horizontal section channel steel (21) is fixedly connected to one end of a steel bar A (22) with a slope of 15° to 30°, the other end of the steel bar A (22) is fixedly connected to an anchor rod B (23), and the anchor rod B (23) is inserted obliquely upward into the mountain body to be fixed firmly; the other end of the horizontal section channel steel (21) is welded and fixed to the exposed section of the anchor rod C (24), and a steel bar B (27) is provided at the connection between the horizontal section channel steel (21) and the anchor rod C (24); the anchor rod C (24) is connected to one end of the anchor rod D (26), and the other end of the anchor rod D (26) is inserted into the mountain body to be fixed firmly; Step 2.2, channel steel diagonal brace setting: a channel steel diagonal brace (25) is set at the bottom of the horizontal section channel steel (21); one end of the channel steel diagonal brace (25) is connected to the horizontal section channel steel (21), and the other end of the channel steel diagonal brace (25) is inserted into the mountain to form a stable bottom support system; Step 3: Main frame lap joint, including the following steps: Step 3.1, setting the row and step distance of the scaffold: using 48.3×3.6mm steel pipes for erection, the horizontal distance, vertical distance and step distance are 1.5m, 1.5m and 1.7m respectively; firstly lay the first row of large crossbars (31) and small crossbars (32) on the horizontal I-beam (12) close to the cantilever platform; Step 3.2, connecting the vertical poles with the bottom platform: a plurality of vertical poles (33) are arranged and connected and fixed with the first row of large cross bars (31) and small cross bars (32), wherein the vertical poles (33) are vertically and cross-fixedly connected with the large cross bars (31) in the longitudinal direction, and the vertical poles (33) are horizontally and vertically and cross-fixedly connected with the small cross bars (32), and the large cross bars (31) and the small cross bars (32) are vertically and cross-fixedly connected; the bottom ends of some vertical poles (33) are fixedly connected with the bottom platform, and the bottom ends of the remaining vertical poles (33) are fixedly connected with the mountain body; the bottom ends of the vertical poles (33) are also provided with longitudinal sweeping rods (35) and transverse sweeping rods (36), wherein the longitudinal sweeping rods (35) are vertically and cross-fixedly connected with the bottom ends of the vertical poles (33); the rod body of the transverse sweeping rod (36) is vertically and cross-fixedly connected with the bottom ends of the vertical poles (33), and one end of the transverse sweeping rod (36) is inserted into the mountain body and fixedly secured; Step 3.3, layer-by-layer erection and wall connection member setting: gradually erect the large crossbar (31) and the small crossbar (32) from top to bottom and from near to far; when the main node with the wall connection member (34) is erected, the wall connection member (34) is immediately set, and the wall connection member (34) is fixedly connected with the large crossbar (31) and the small crossbar (32) in a "two-step three-span" arrangement; Step 3.4: Setting of scissor braces and pedestrian passage: After the large crossbar (31) and the small crossbar (32) are set up, scissor braces (37) are continuously set up on the facade of the frame, wherein the inclination angle of the diagonal rod of the scissor braces (37) is preferably between 45° and 60°; then, a pedestrian passage (39) is set up according to the use requirements, arranged in a zigzag shape, and a rest platform with a width of not less than 1m is set at the turning point, and the overall slope of the passage is not greater than 1:3, and the bottom of the pedestrian passage (39) is fixedly connected to the large crossbar (31) and the small crossbar (32); Step 4: Additional component installation, including the following steps: Step 4.1, scaffolding board and protective facilities are arranged: bamboo springboards are selected as scaffolding boards (41) for laying, the scaffolding boards (41) are laid on the large crossbar (31) and the small crossbar (32), and a footboard (42) is arranged outside the scaffolding board (41); a dense mesh (43) is arranged inside the scaffolding outer pole (33), and the dense mesh is firmly tied to the pole with lead wire; Step 4.2, Inspection and Acceptance: After the installation of additional components is completed, all connection points, welds, and anchors should be thoroughly inspected to ensure that the overall structure is stable, safe and reliable. Only after confirmation can the cantilever scaffolding be put into use.

2. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: When the horizontal I-beam (12) in step 1 is extended, a 16 mm thick steel plate with a length of not less than 50 cm is used for reinforcement at the joint, and the joints are staggered and arranged at the anchor point of the anchor rod, and steel plates are welded at the joints with large gaps.

3. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: When the anchor rods A (13) in step 1.2 are used to anchor the horizontal I-beam (12), the anchor rods A (13) are arranged symmetrically on the left and right sides of the horizontal I-beam (12), that is, two anchor rods A (13) are arranged at one anchor point, and the portion of the anchor rods A (13) that is higher than the horizontal I-beam (12) is cold-bent and then welded to the horizontal I-beam (12), and the anchor points are arranged at a spacing of 2m.

4. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: The I-beam column (14) in step 1.2 is welded at a distance of 6 m from the end of the horizontal I-beam (12), one end of the I-beam brace (15) is welded at a distance of 3 m from the end of the horizontal I-beam (12), the other end of the I-beam brace (15) is welded to the I-beam column (14), the bottom of the I-beam column (14) is reinforced with a reinforcing anchor rod (16), if the I-beam column (14) does not have construction conditions, the I-beam brace (15) is used for support and the bottom of the I-beam brace (15) is also reinforced with a reinforcing anchor rod (16), one end of the reinforcing anchor rod (16) is fixedly connected to the bottom of the I-beam column (14) or the I-beam brace (15), and the other end of the reinforcing anchor rod (16) is firmly fixed to the inserted mountain.

5. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: The specific method of obliquely pulling and fixing the steel strand (17) in step 1.2 is: firstly use the steel strand (17) to tie the ends of 3 to 5 horizontal I-beams (12) and then obliquely pull the steel strand (17) to the dowel anchor rod (18) at the top of the arch seat (19) for fixed connection.

6. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: The large crossbar (31), the small crossbar (32) and the vertical bar (33) are extended by a butt fastener or a rotating fastener that matches the size of the bar; the large crossbar (31), the small crossbar (32) and the vertical bar (33) are connected to each other by a right-angle fastener that matches the size of the bar; the diagonal bar of the scissors brace (37) is extended and connected to the vertical bar (33) by a rotating fastener that matches the size of the bar.

7. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: When the vertical poles (33) are initially erected in step 3, a guy support is provided every 6 spans, and the guy support can be removed only after the wall connecting member (34) is firmly installed.

8. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: In step 3.2, part of the vertical pole (33) is fixedly connected to the mountain through the inserted reinforcement (38), the bottom end of the part of the vertical pole (33) is fixedly connected to one end of the inserted reinforcement (38), and the other end of the inserted reinforcement (38) is inserted into the mountain to be fixed firmly.

9. The method for erecting a cantilever scaffolding on a steep cliff near a river according to claim 1, characterized in that: The wall connection member (34) is formed by connecting a C25 anchor rod and a φ10 steel bar. The steel bar on the wall connection member (34) is connected to a scaffolding rod body. The anchor rod on the wall connection member (34) is inserted into the rock by 3m.

10. The method for erecting a cantilever scaffolding on a high and steep cliff near a river according to claim 1, characterized in that: Some of the wall connecting members (34) are steel rope anchor rods.

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