Cantilever structure for side slope and construction method thereof
By designing a cantilever structure including main cantilever steel beams and reinforced concrete plane foundations on the slope, and using the fixing method of resistant anchors and bolts, the construction problems of cantilever structures on the slope are solved, the reliability and stability of the structure are improved, and the project costs and construction period are reduced.
Patent Information
- Application Number
- CN202411923856.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-03-21
AI Technical Summary
Setting up cantilever structures on the slopes faces technical problems such as steep terrain, narrow working space, complex geological conditions, low reliability of cantilever structures, and difficulty in ensuring anti-capsulation and anti-slip stability.
A cantilever structure including the main cantilever steel beam and the reinforced concrete plane foundation was designed. It was fixed in the slope foundation groove by a movable anchor rod. The main cantilever steel beam and the reinforced concrete plane foundation were connected by bolts, and steel inclined rods were added when necessary to increase the outer lift length.
It effectively solves the problems of steep terrain and small working space on the slope, improves the reliability and stability of the cantilever structure, reduces engineering measures for slope treatment, reduces project costs, and shortens construction period.
Smart Images
Figure CN119663987A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building structure and foundation design, and in particular to a cantilever structure used on a slope and a construction method thereof. Background Art
[0002] In modern society, slopes are natural resources. Slope landscape design is to make full use of natural and slope resources to form a unique landscape style. In order to obtain a good view and create a unique landscape value, some cantilevered landscape platforms, plank roads or landscape sketches are usually set up on the slopes. The landscape platform can be made of steel structure, concrete structure or wooden structure. Due to factors such as the terrain conditions, geological conditions, cantilever length, landscape shape, etc. of the slope, it is difficult to set up a cantilever structure on the slope, which is mainly reflected in the following points:
[0003] 1. The slope is generally steep, and the working surface available for construction is narrow. Large construction machinery usually cannot operate on it, which brings difficulties to the foundation design of the cantilever structure. The mechanical bored piles commonly used on flat ground cannot be used on slopes. In addition, the geological conditions of the slope are often complex and changeable, including loose soil, rock fracture zones, unfavorable hydrological conditions, etc. These complex geological conditions bring great difficulties to the foundation design of the slope;
[0004] 2. The reliability of the cantilever structure itself is usually low, and the wind load on the slope is generally large. The cantilever platform is usually a place with dense traffic, and its safety is much higher than that of the general structure. This brings new challenges to the structural design. For the cantilever structure, strict anti-overturning calculation is required to ensure that the platform will not overturn when bearing loads. The cantilever platform on the slope also needs to consider the anti-slip stability. Due to the inclined slope terrain, the platform is easily affected by the sliding force along the slope direction. It is necessary to design effective anti-slip measures, such as setting anti-slip anchor rods and anti-slip piles.
[0005] 3. How to ensure the stability of slopes when building new structures on them has always been a difficult problem in the engineering community, especially on soil slopes or severely weathered rock slopes, which are inherently unstable and it is even more difficult to build new structures on them;
[0006] 4. The slope also brings new challenges to construction, especially during the formwork process, when the stability and safety of the formwork must be ensured. If the geological conditions are poor, such as loose soil or the risk of landslides, the formwork work will become particularly difficult. Summary of the invention
[0007] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a cantilever structure for use on a slope and a construction method thereof, so as to effectively solve the construction problems of steep terrain and narrow working space on the slope.
[0008] To achieve the above-mentioned purpose, the cantilever structure designed for use on a slope in the present invention includes a main cantilever steel beam and a reinforced concrete plane foundation arranged on the slope, wherein one end of the main cantilever steel beam toward the slope extends into the reinforced concrete plane foundation, and the reinforced concrete plane foundation is fixed in a base groove of the slope by an anti-pullout anchor rod, and the main cantilever steel beam is connected to the reinforced concrete plane foundation by bolts arranged on the surface, one end of the anti-pullout anchor rod is inserted into the slope, and the other end is connected to the reinforced concrete plane foundation through an internal reinforcement body, and plane foundation steel bars are laid in the reinforced concrete plane foundation.
[0009] Preferably, it also includes a steel diagonal rod, one end of which is supported on the bottom of the main cantilever steel beam, and the other end is fixed to a reinforced concrete slope foundation arranged on the slope surface through a steel anchor bolt, and the reinforced concrete slope foundation is provided with slope foundation steel bars.
[0010] Preferably, the type of the anti-pullout anchor rod is selected according to engineering needs, geological conditions, stress characteristics and regional experience. The anti-pullout anchor rod includes full-length bonded anchor rod, tension prestressed anchor rod, pressure prestressed anchor rod, pressure dispersion prestressed anchor rod and expanded anchor rod. The anti-pullout anchor rod is arranged according to actual conditions to ensure that the foundation is reasonably and evenly stressed to avoid progressive damage.
[0011] Preferably, the tendons in the anti-pullout anchor rod are hot-rolled ribbed steel bars or prestressed steel strands, the strength of the hot-rolled ribbed steel bars is not less than 400MPa, and the strength of the prestressed steel strands is not less than 1860MPa. The diameter and number of the tendons are determined by calculation and can withstand the ultimate tensile bearing capacity of the anti-pullout anchor rod; the slurry in the anti-pullout anchor rod adopts cement slurry of not less than M30 or fine stone concrete of not less than C30, and the cement adopts ordinary Portland cement or composite Portland cement, and the cement strength grade is not less than 42.5, and the strength grade of cement slurry and cement mortar is not less than 30MPa. The fine aggregate used for the slurry is sand with a particle size of less than 2.0mm, and the mud content of the sand is not more than 3% of the total weight by weight, and the total content of mica, organic matter, sulfide and sulfate in the sand is not more than 1% of the total weight by weight.
[0012] Preferably, the concrete grade of the reinforced concrete plane foundation is not less than C30, and the thickness is not less than 500mm. Its plane size is determined by the arrangement of the anti-pullout anchor rods. The edge of the reinforced concrete plane foundation is not less than 8 times the diameter of the anti-pullout anchor rod and not less than 300mm from the center of the anti-pullout anchor rod. The plane foundation steel bars are double-layer bidirectional reinforcement with a spacing of no more than 200mm. It is determined by calculation according to the actual engineering design. A plain concrete cushion layer is provided under the reinforced concrete plane foundation with a thickness of 80 to 100mm. The plane size is 80 to 100mm wider than the reinforced concrete plane foundation, and the concrete grade is C20.
[0013] Preferably, the reinforced concrete slope foundation is arranged on a rock slope with moderate weathering or above. The plane size of the reinforced concrete slope foundation is determined by the foundation bearing capacity and the local compressive bearing capacity, not less than 800X800mm, and the thickness is not less than 800mm. A plain concrete cushion layer is provided under the reinforced concrete slope foundation, with a thickness of 80 to 100mm. The plane size is 80 to 100mm wider than the reinforced concrete plane foundation, and the concrete grade is C20.
[0014] Preferably, the main cantilever steel beam is distributed with steel secondary beams perpendicular to it in the plane, the spacing of the main cantilever steel beams in the plane is 6 to 8 meters, the length of the main cantilever steel beam extending into the reinforced concrete plane foundation is not less than 0.2 times the cantilever length and not less than 0.7 meters, the spacing of the steel secondary beams is 1 to 2 meters, the main cantilever steel beam and the steel secondary beam are welded H-shaped steel beams, rolled I-shaped steel beams or rectangular steel beams, and the steel strength is generally Q235B or Q355B.
[0015] Preferably, the tensile strength limit value of the peg is greater than 400 MPa, the diameter of the peg is not less than 13 mm, the height is not less than 4 times the rod diameter, and the spacing between the pegs is not greater than 400 mm.
[0016] A construction method for a cantilever structure on a slope, comprising the following steps:
[0017] A) Excavate a foundation trench on the slope, then drill holes in the foundation trench, insert the reinforcement in the anti-pullout anchor rod after drilling, and then grouting;
[0018] B) After the age of the anti-pullout anchor reaches the preset number of days and passes the test, a plain concrete cushion is laid at the bottom of the foundation trench, and then the plane foundation steel bars in the reinforced concrete plane foundation are tied, and the main cantilever steel beam is fixed in the reinforced concrete plane foundation, and finally concrete is poured;
[0019] C) After the welds and bolts of the steel platform are completed and tested to be qualified, the steel components are painted with anti-corrosion paint, and after the painting is completed, the platform panels are laid.
[0020] Preferably, if steel diagonal rods are provided, after the foundation trench is excavated on the inclined surface of the slope, the inclined foundation steel bars in the reinforced concrete inclined foundation are tied, the steel diagonal rods are fixed in the reinforced concrete inclined foundation by steel anchor bolts, and then concrete is poured.
[0021] Compared with the prior art, the present invention has the following advantages:
[0022] 1. Anti-pull anchor rods can be used for construction with small drilling rod machines. They are small in size and easy to move, which effectively solves the construction problems of steep terrain and narrow working space on the slope;
[0023] 2. Instead of using the traditional reinforced concrete structure, a steel structure is used. The steel structure has high material strength, light weight, can be precisely manufactured in the factory, has fast on-site assembly speed, is free of formwork, has a short construction period, and is easy to ensure quality. It effectively solves the problem of difficult formwork on the slope and provides more possibilities for creating structures on the slope;
[0024] 3. The impact of anti-pull anchor rods and reinforced concrete foundations on the slope is small, which can reduce the engineering measures for slope treatment and reduce engineering costs, and can produce positive economic and social benefits;
[0025] 4. The addition of steel diagonal rods greatly increases the cantilever length of the cantilever structure and fully expands the usable area on the slope;
[0026] 5. The upper part of the main cantilever steel beam can be made of wood, precast concrete or patterned steel, etc., which can be selected by the owner according to their needs. It can also be replaced later according to changes in functional requirements, providing more possibilities for landscape creation. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the structure of the cantilever knot used on the slope of the present invention;
[0028] Figure 2 It is a schematic structural diagram of the plane layout of the cantilever knot used on the slope of the present invention.
[0029] The components in the figure are numbered as follows:
[0030] Main cantilever steel beam 1, slope 2, reinforced concrete plane foundation 3, anti-pullout anchor rod 4, stud 5, reinforcement body 6, plane foundation steel bar 7, steel diagonal rod 8, steel anchor bolt 9, reinforced concrete inclined foundation 10, plain concrete cushion layer 11, steel secondary beam 12, inclined foundation steel bar 13, platform plate 14. DETAILED DESCRIPTION
[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.
[0032] like Figure 1 and Figure 2 As shown, a cantilever structure for use on a slope includes a main cantilever steel beam 1 and a reinforced concrete plane foundation 3 arranged on the slope 2. One end of the main cantilever steel beam 1 toward the slope 2 extends into the reinforced concrete plane foundation 3, and the reinforced concrete plane foundation 3 is fixed in the base groove of the slope 1 through an anti-pull anchor rod 4. The main cantilever steel beam 2 is connected to the reinforced concrete plane foundation 3 through bolts 5 arranged on the surface. One end of the anti-pull anchor rod 4 is inserted into the slope 1, and the other end is connected to the reinforced concrete plane foundation 3 through the internal reinforcement body 6. The reinforced concrete plane foundation 3 is provided with a plane foundation steel bar 7.
[0033] This embodiment, when used for the construction of a cantilever structure on a slope, comprises the following steps:
[0034] A) excavating a foundation trench on the slope 2, then drilling holes in the foundation trench, inserting the reinforcement 6 in the anti-pull anchor rod 4 after the drilling is completed, and then grouting;
[0035] B) After the age of the anti-pullout anchor rod 4 reaches the preset number of days and is tested to be qualified, a plain concrete cushion layer 11 is laid at the bottom of the foundation trench, and then the plane foundation steel bars 7 in the reinforced concrete plane foundation 3 are tied, and the main cantilever steel beam 1 is fixed in the reinforced concrete plane foundation 3, and finally concrete is poured;
[0036] C) After the welds and bolts of the steel platform are completed and tested to be qualified, the steel components are painted with anti-corrosion paint, and after the painting is completed, the platform plate 14 is laid.
[0037] In addition, in step A), when drilling, the hole is drilled according to the hole position, hole diameter, length and inclination of the anti-pull anchor rod 4 determined by the design. Commonly used drilling machines include rotary, pneumatic impact and impact rotary. When drilling in complex geological conditions such as loose soil layers with gushing water and weathered and broken rock layers, a rotary drilling rig is generally used and a casing is required; in hard rock layers, a pneumatic impact drilling rig is used for drilling, which has the best effect; in case of pebbles, boulders, etc., an impact rotary drilling rig should be used as the best. This process is a key link affecting the anchoring project. When drilling, bentonite wall protection should generally not be used to avoid the formation of mud skin on the hole wall and reduce the friction between the anchor body and the hole wall. After the drilling is completed, the slurry should be fully washed in the borehole with clean water in time to clear the rock powder and other debris out of the hole, and then the water accumulated in the hole should be blown dry with compressed air.
[0038] After the drilling is completed, the reinforcement body 6 in the anti-pullout anchor rod 4 is inserted, and then grouting is carried out. The equipment used for grouting is generally a mixer, a grouting machine, etc. In order to allow the mortar to flow in the grouting pipe and make the mortar strength reach above 30Mpa, it is advisable to adopt a lime-sand weight ratio of 1:1 and cement 0.4-0.5. In order to improve the early strength of the mortar, salt and triethanolamine additives can also be added in appropriate amounts. The cement used for the mortar is preferably No. 425 ordinary Portland cement, and the sand is sieved medium sand. The three materials of cement, sand and water need to be mixed evenly in the mixer according to the mix ratio to prevent large pieces of material from clogging the grouting pump. For small-diameter anti-pullout anchor rods 4, cement slurry is sometimes used for one-time grouting.
[0039] In step C), the estimated design service life of the anti-corrosion coating is usually 5 to 10 years. Before pretreatment, burrs, welding slag, spatter, dust accumulation, loose iron oxide scale, rust, and visible grease and dirt should be removed. Paints are divided into primers, intermediate paints, and topcoats.
[0040] In this embodiment, the type of anti-pull anchor rod 4 is selected according to engineering needs, geological conditions, stress characteristics and regional experience. The anti-pull anchor rod 4 includes full-length bonded anchor rod, tension prestressed anchor rod, pressure prestressed anchor rod, pressure dispersion prestressed anchor rod and expanded anchor rod. The anti-pull anchor rod 4 is arranged according to actual conditions to ensure that the foundation is reasonably and evenly stressed to avoid progressive damage.
[0041] In addition, the tendon 6 in the anti-pullout anchor rod 4 is a hot-rolled ribbed steel bar or a prestressed steel strand. The strength of the hot-rolled ribbed steel bar is not less than 400MPa, and the strength of the prestressed steel strand is not less than 1860MPa. The diameter and number of the tendon 6 are determined by calculation and can withstand the ultimate tensile bearing capacity of the anti-pullout anchor rod 4. The prestressed steel strand used in the tendon body should be a continuous body except for repair and should not be connected. The non-prestressed anti-pullout anchor rod 4 and the reinforced concrete plane foundation 3 can be connected to each other by straight anchors, bent hooks or mechanical anchors. When the prestressed anti-pullout anchor rod 4 is connected to the reinforced concrete plane foundation 3, a pad and an anchor clamp should be used for connection. The plane size of the pad should meet the requirements of the shearing and local compressive bearing capacity of the concrete bottom plate, and the thickness of the pad should meet the strength requirements.
[0042] The slurry in the anti-pullout anchor 4 adopts cement slurry of not less than M30 or fine stone concrete of not less than C30, and admixtures should be added according to the needs of the project. Cement adopts ordinary silicate cement or composite silicate cement. The cement performance should comply with the relevant provisions of the current national standards. High alumina cement shall not be used. The cement strength grade shall not be less than 42.5, the strength grade of cement slurry and cement mortar shall not be less than 30MPa, and the strength grade of fine stone concrete shall not be less than C30. The fine aggregate used in the slurry shall be sand with a particle size of less than 2.0mm. The mud content of the sand shall not exceed 3% of the total weight by weight, and the total content of mica, organic matter, sulfide and sulfate in the sand shall not exceed 1% of the total weight by weight. The admixture used in the slurry shall be determined through a proportioning test. The admixture shall not affect the bonding performance between the slurry and the rock mass, and shall not corrode the anti-pullout anchor 4.
[0043] The anti-pullout anchor rod 4 in this embodiment can be constructed using various anchor drilling machines. It is small in size, easy to move, and can be operated on the slope.
[0044] In this embodiment, the concrete grade of the reinforced concrete plane foundation 3 is not less than C30, and the thickness is not less than 500mm. Its plane size is determined by the arrangement of the anti-pull anchor rod 4. The edge of the reinforced concrete plane foundation 3 is not less than 8 times the diameter of the anti-pull anchor rod 4 and not less than 300mm from the center of the anti-pull anchor rod 4. The plane foundation steel bar 3 is double-layer bidirectional reinforcement with a spacing of no more than 200mm. It is determined by calculation according to the actual engineering design that a plain concrete cushion layer 11 is provided under the reinforced concrete plane foundation 3 with a thickness of 80 to 100mm. The plane size is 80 to 100mm wider than the reinforced concrete plane foundation 3, and the concrete grade is C20.
[0045] At the same time, the main cantilever steel beam 1 is distributed with steel secondary beams 12 which are perpendicular to it in the plane. The spacing of the main cantilever steel beams 1 in the plane is 6 to 8 meters. The length of the main cantilever steel beam 1 extending into the reinforced concrete plane foundation 3 is not less than 0.2 times the cantilever length and not less than 0.7 meters. The spacing of the steel secondary beams 12 is 1 to 2 meters, which should be determined according to the material of the structural plate on the platform. When it is wood or glass, a smaller value should be taken, and when it is a precast concrete slab or steel plate, a larger value can be taken. The main cantilever steel beam 1 and the steel secondary beam 12 are welded H-shaped steel beams, rolled I-shaped steel beams or rectangular steel beams, and the steel strength is generally Q235B or Q355B.
[0046] In this embodiment, the tensile strength limit value of the stud 5 is greater than 400 MPa, the diameter of the stud 5 is not less than 13 mm, the height is not less than 4 times the rod diameter, and the spacing between the studs 5 is not greater than 400 mm.
[0047] In other embodiments, when the cantilever length of the main cantilever steel beam 1 is greater than 4 meters, a steel diagonal rod 8 needs to be installed. One end of the steel diagonal rod 8 is supported on the bottom of the main cantilever steel beam 1, and the other end is fixed to a reinforced concrete slope foundation 10 arranged on the slope of the slope 2 through a steel anchor bolt 9. The reinforced concrete slope foundation 10 is provided with slope foundation steel bars 13.
[0048] The reinforced concrete slope foundation 10 is set on the rock slope 2 with moderate weathering or above. The plane size of the reinforced concrete slope foundation 10 is determined by the foundation bearing capacity and the local compressive bearing capacity, not less than 800X800mm, and the thickness is not less than 800mm. A plain concrete cushion layer 11 is provided under the reinforced concrete slope foundation 10, with a thickness of 80-100mm, a plane size of 80-100mm wider than the reinforced concrete plane foundation 10, and the concrete grade is C20.
[0049] During construction, after the foundation trench is excavated on the slope of the slope 2, the slope foundation steel bars 13 in the reinforced concrete slope foundation 10 are tied, the steel diagonal rods 8 are fixed in the reinforced concrete slope foundation 10 by steel anchor bolts 9, and then concrete is poured.
[0050] The cantilever structure and construction method of the present invention used on the slope adopts an anti-pull anchor rod 4, which can be constructed by a small drilling rod machine. It is small in size and easy to move, effectively solving the construction problems of steep terrain and narrow working space on the slope; instead of adopting the traditional reinforced concrete structure, a steel structure is adopted. The steel structure has high material strength and light weight, can be accurately manufactured in a factory, has a fast on-site assembly speed, is free from formwork, has a short construction period, and is easy to ensure quality, effectively solving the problem of difficult formwork on the slope, and providing more possibilities for creating structures on the slope; the anti-pull anchor rod 4 and the reinforced concrete foundation have little impact on the slope, can reduce the engineering measures for slope treatment, reduce engineering costs, and can produce positive economic and social benefits; the steel diagonal rod 8 is added, thereby greatly increasing the cantilever length of the cantilever structure and fully expanding the use area on the slope; the upper part of the main cantilever steel beam 1 can be a wooden board, a concrete prefabricated board or a patterned steel plate, etc., which can be selected by the owner according to needs, and can be replaced later according to changes in functional requirements, providing more possibilities for landscape creation.
[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A cantilever structure for use on a slope, comprising a main cantilever steel beam (1), characterized in that: It also includes a reinforced concrete plane foundation (3) arranged on the slope (2), one end of the main cantilever steel beam (1) facing the slope (2) extends into the reinforced concrete plane foundation (3), the reinforced concrete plane foundation (3) is fixed in the base groove of the slope (1) through an anti-pull anchor rod (4), the main cantilever steel beam (2) is connected to the reinforced concrete plane foundation (3) through a bolt (5) arranged on the surface, one end of the anti-pull anchor rod (4) is inserted into the slope (1), and the other end is connected to the reinforced concrete plane foundation (3) through an internal reinforcement body (6), and a plane foundation steel bar (7) is laid in the reinforced concrete plane foundation (3).
2. The cantilever structure for use on a slope according to claim 1, characterized in that: It also includes a steel diagonal rod (8), one end of which is supported on the bottom of the main cantilever steel beam (1), and the other end of which is fixed to a reinforced concrete inclined surface foundation (10) arranged on the inclined surface of the slope (2) through a steel anchor bolt (9), wherein inclined surface foundation steel bars (13) are laid in the reinforced concrete inclined surface foundation (10).
3. The cantilever structure for use on a slope according to claim 1, characterized in that: The type of the anti-pullout anchor rod (4) is selected according to engineering needs, geological conditions, stress characteristics and regional experience. The anti-pullout anchor rod (4) includes a full-length bonded anchor rod, a tension-type prestressed anchor rod, a pressure-type prestressed anchor rod, a pressure-dispersed prestressed anchor rod and an expanded anchor rod. The anti-pullout anchor rod (4) is arranged according to actual conditions to ensure that the foundation is reasonably and evenly stressed and to avoid progressive damage.
4. The cantilever structure for use on a slope according to claim 1, characterized in that: The tendon (6) in the anti-pullout anchor rod (4) is a hot-rolled ribbed steel bar or a prestressed steel strand, the strength of the hot-rolled ribbed steel bar is not less than 400MPa, the strength of the prestressed steel strand is not less than 1860MPa, the diameter and number of the tendon (6) are determined by calculation, and can withstand the ultimate tensile bearing capacity of the anti-pullout anchor rod (4); the slurry in the anti-pullout anchor rod (4) adopts cement slurry of not less than M30 or fine stone concrete of not less than C30, the cement adopts ordinary silicate cement or composite silicate cement, the cement strength grade is not less than 42.5, the cement slurry and cement mortar strength grade is not less than 30MPa, the fine aggregate used in the slurry is sand with a particle size of less than 2.0mm, the mud content of the sand is not more than 3% of the total weight by weight, and the total content of mica, organic matter, sulfide and sulfate in the sand is not more than 1% of the total weight by weight.
5. The cantilever structure for use on a slope according to claim 1, characterized in that: The concrete grade of the reinforced concrete plane foundation (3) is not less than C30, and the thickness is not less than 500 mm. Its plane size is determined by the arrangement of the anti-pullout anchor rod (4). The distance between the edge of the reinforced concrete plane foundation (3) and the center of the anti-pullout anchor rod (4) is not less than 8 times the rod diameter of the anti-pullout anchor rod (4) and not less than 300 mm. The plane foundation steel bars (3) are double-layer bidirectional reinforcements with a spacing of no more than 200 mm. According to the actual engineering design, a plain concrete cushion layer (11) is provided under the reinforced concrete plane foundation (3), with a thickness of 80 to 100 mm, a plane size of 80 to 100 mm wider than the reinforced concrete plane foundation (3), and a concrete grade of C20.
6. The cantilever structure for use on a slope according to claim 2, characterized in that: The reinforced concrete slope foundation (10) is arranged on a rock slope (2) with moderate weathering or above. The plane size of the reinforced concrete slope foundation (10) is determined by the foundation bearing capacity and the local compressive bearing capacity, and is not less than 800X800mm. The thickness is not less than 800mm. A plain concrete cushion layer (11) is arranged below the reinforced concrete slope foundation (10). The thickness is 80-100mm. The plane size is 80-100mm wider than the reinforced concrete plane foundation (10). The concrete grade is C20.
7. The cantilever structure for use on a slope according to claim 1, characterized in that: The main cantilever steel beam (1) is provided with steel secondary beams (12) perpendicular to the main cantilever steel beam (1) in a plane. The spacing of the main cantilever steel beams (1) in a plane is 6 to 8 meters. The length of the main cantilever steel beam (1) extending into the reinforced concrete plane foundation (3) is not less than 0.2 times the cantilever length and not less than 0.7 meters. The spacing of the steel secondary beams (12) is 1 to 2 meters. The main cantilever steel beam (1) and the steel secondary beam (12) are welded H-shaped steel beams, rolled I-shaped steel beams or rectangular steel beams. The steel strength is generally Q235B or Q355B.
8. The cantilever structure for use on a slope according to claim 1, characterized in that: The tensile strength limit value of the stud (5) is greater than 400 MPa, the diameter of the stud (5) is not less than 13 mm, the height is not less than 4 times the rod diameter, and the spacing between the studs (5) is not greater than 400 mm.
9. A construction method for a cantilever structure on a slope as claimed in claim 1, characterized in that: The steps include: A) excavating a foundation trench on the slope (2), then drilling holes in the foundation trench, inserting the reinforcement body (6) in the anti-pullout anchor rod (4) after the drilling is completed, and then grouting; B) After the age of the anti-pullout anchor rod (4) reaches a preset number of days and passes the test, a plain concrete cushion layer (11) is laid at the bottom of the foundation trench, and then the plane foundation steel bars (7) in the reinforced concrete plane foundation (3) are tied, and the main cantilever steel beam (1) is fixed in the reinforced concrete plane foundation (3), and finally concrete is poured; C) After the welds and bolts of the steel platform are completed and tested to be qualified, the steel components are painted with anti-corrosion paint, and after the painting is completed, the platform panels are laid.
10. The construction method for a cantilever structure on a slope according to claim 9, characterized in that: If steel diagonal rods (8) are provided, after a foundation trench is excavated on the inclined surface of the slope (2), the inclined surface foundation steel bars (13) in the reinforced concrete inclined surface foundation (10) are tied, and the steel diagonal rods (8) are fixed in the reinforced concrete inclined surface foundation (10) by steel anchor bolts (9), and then concrete is poured.