CN113006106A - Existing side slope secondary excavation safety protection device and construction method - Google Patents

Abstract

The invention discloses a safety protection device for secondary excavation of an existing side slope and a construction method, wherein the safety protection device for secondary excavation of the existing side slope comprises a color steel enclosure arranged at a slope foot of the existing side slope and a protection wall arranged on a platform, the color steel enclosure comprises a color steel plate arranged at the slope foot, a prefabricated upright post ground beam is embedded in a soil body below the color steel plate, a steel upright post is arranged in the upright post ground beam, and the color steel plate is connected with the steel upright post; according to the invention, the color steel enclosure and the protective wall intercept the rock-soil body collapsing or slipping down under the secondary excavation disturbance of the side slope in a segmented manner, so that the distance of the rock-soil body slipping is reduced, and the potential energy of the rock-soil body slipping is reduced; under multiple protection measures, the problem that rock-soil body collapse or slide caused by secondary excavation disturbance of the side slope influences the traffic safety of the road on the lower part is effectively solved; the safety protection device can be repeatedly used, so that the construction cost is effectively reduced, the construction period is shortened, the construction efficiency is improved, and the construction process is simplified.

Description

Existing side slope secondary excavation safety protection device and construction method

Technical Field

The invention relates to the technical field of road slope construction, in particular to a safety protection device for secondary excavation of an existing slope and a construction method.

Background

With the development of social economy in China, projects such as highway capacity expansion, national and provincial trunk upgrading and reconstruction and the like emerge in large quantities. In the road expansion scheme, the secondary excavation of a large number of side slopes along the road and the road traffic-keeping operation safety during the construction period become a problem to be solved urgently in engineering construction.

At present, an active protective net in the existing side slope protection mainly carries out active reinforcement protection on unstable cracked rock blocks on a natural steep slope. The passive protective net mainly intercepts and protects the collapsed or rolled rock mass at the toe of the slope, the effective protection and interception are all blocky objects with the grain size larger than the size of the protective net, and the passive protective net has no protection and interception functions on small-grain-size fragments and small-scale slumped or collapsed soil particles. And the protection of the framework slope protection and the facing wall in the engineering are permanent protection measures, and the active protective net is not suitable for temporary protection of side slope excavation. The passive protective net can carry out interim protection, but the interception effect is limited, is difficult to carry out the interception simultaneously to each particle diameter rock mass and soil body, and the protection network invasion road surface is easily strideed across to the abrupt slope rockfall in upper portion simultaneously, and to rebuilding and expansion side slope reuse rate low, the construction is more complicated, engineering cost is high.

Disclosure of Invention

The invention provides a safety protection device for secondary excavation of an existing side slope and a construction method, and aims to solve the technical problems that a traditional protective net is low in interception efficiency and cannot be recycled in the secondary excavation process of the existing side slope.

The technical scheme adopted by the invention is as follows: existing side slope secondary excavation safety device is provided with a plurality of platforms on the existing side slope, include:

the color steel enclosure is arranged at the slope toe of the existing side slope and used for intercepting rock soil blocks and soil particles falling on the existing side slope;

the protective wall is arranged on the platform and used for intercepting rock soil blocks and soil particles falling on the existing side slope;

the color steel enclosure comprises color steel plates arranged on the slope toe, prefabricated stand column ground beams are embedded in soil bodies below the color steel plates, steel stand columns are arranged in the stand column ground beams, and the color steel plates are connected with the steel stand columns. The protective wall of the upper platform is used for blocking the falling objects of the slope rock-soil bodies during excavation of all levels of side slopes, and the color steel enclosure at the lower part is used for protecting the last level of side slope and the falling objects of the slope rock-soil bodies which cannot be intercepted at the upper part. According to the invention, the color steel enclosure and the protective wall intercept the rock-soil body collapsing or slipping down under the secondary excavation disturbance of the side slope in a segmented manner, and the distance of the rock-soil body slipping is reduced, so that the potential energy of the rock-soil body slipping is reduced. The upright post and the ground beam are prefabricated, so that the upright post and the ground beam can be repeatedly used in the process of gradual excavation of the side slope, the construction period and the construction cost are reduced, and the construction efficiency is improved; the color steel plate is plate-shaped, can effectively intercept large rock-soil bodies, small-particle-size fragments and small-scale collapsed or collapsed soil particles, and avoids the rock-soil bodies, the soil particles and the like from invading a traffic lane.

Further, one side of the color steel plate, which is close to the road, is provided with a waveform guardrail, and the waveform guardrail is connected with the color steel plate through a steel support. The wave form guardrail plays the guard action to the vehicle on the road, avoids the vehicle directly to strike various steel sheet, also plays the guard action to various steel sheet simultaneously, avoids various steel sheet to receive the striking damage and then reduces the interception effect of various steel sheet.

Further, two ends of the steel support are provided with buffer rubber gaskets. The cushion rubber gasket has certain flexibility, can play the effect of buffering, shock attenuation energy dissipation, improves the impact resistance and the function of blocking that the various steel encloses the cover, reduces the damage that the structure caused by the impact.

Furthermore, a plurality of vertical pipe holes penetrating through the upright post ground beam are preset in the upright post ground beam, threaded steel nails are arranged in the pipe holes, the threaded steel nails penetrate through the pipe holes and extend into the soil body below the upright post ground beam, and the head of each threaded steel nail is sequentially provided with a steel washer and a rubber gasket from top to bottom. The screw-thread steel nail plays the reinforcing effect to ground body around stand ground beam and the stand ground beam, improves the anchor power of stand ground beam, effectively strengthens various steel and encloses the overall stability who covers protective structure. When the blocking object impacts the color steel enclosure, the rubber gaskets at the threaded steel nail part can be coordinately deformed, and the displacement caused by multiple times of impact vibration on the upright post ground beam is reduced.

Furthermore, the protective wall comprises a first square steel pipe bent frame and a bamboo plywood paved on the first steel pipe bent frame, a prefabricated supporting ground beam is arranged in a soil body below the first steel pipe bent frame, and the first steel pipe bent frame is connected with the supporting ground beam. The bamboo plywood can intercept large rock-soil bodies and small-particle-size fragments which collapse or slide under the disturbance of secondary excavation of the side slope and small-scale collapsed or collapsed soil particles; because the supporting ground beam is prefabricated, the supporting ground beam can be repeatedly used in the process of gradual excavation of the side slope, the construction period and the construction cost are reduced, and the construction efficiency is improved.

The first steel pipe bent frame comprises a horizontal steel pipe and a first vertical steel pipe, wherein the horizontal steel pipe is horizontally arranged, the first vertical steel pipe is vertically arranged, the horizontal steel pipe is connected with the first vertical steel pipe through a connecting fastener, and the first vertical steel pipe penetrates through the supporting ground beam and extends into a soil body below the supporting ground beam; the side surface of the part, extending to the soil body, of the first vertical steel pipe is provided with a plurality of grouting holes. The first steel pipe bent erected by the steel pipes has the advantages of being high in strength and stability, cement mortar can be injected through the grouting holes, and anchoring force and stability of the supporting ground beam are improved.

Further, the first steel pipe bent is close to the second steel pipe bent that is provided with of the inboard certain distance of interval of existing side slope, and the second steel pipe bent upper berth is equipped with the wire net, and the second steel pipe bent passes through bolted connection with the support grade beam, and the second steel pipe bent includes the vertical steel pipe of a plurality of vertical layout's second, and the vertical steel pipe of second passes through the steel pipe roof beam and links to each other through connecting fastener with first steel pipe bent. The steel wire mesh is used for intercepting large rock-soil bodies with the diameters larger than the meshes, and the bamboo plywood can intercept small-particle-size fragments and soil particles passing through the steel wire mesh. The combination of the two can effectively and comprehensively intercept large rock and soil masses, small-particle-size fragments and small-scale slumped or collapsed soil particles, thereby improving the interception efficiency. The objects intercepted by the two are different, the problem of unilateral stress of the bamboo plywood is avoided due to the arrangement of the steel wire gauze, and the overall stability of the protective wall is improved. Because a certain distance is reserved between the bamboo plywood and the steel wire mesh, the bamboo plywood has the energy dissipation and buffering effects.

Furthermore, a pull rope is arranged on the first steel pipe bent, a grouting anchor rod is arranged at the end part of the pull rope, the grouting anchor rod extends into the existing side slope, and the grouting anchor rod is perpendicular to the slope surface of the existing side slope; the pull rope is provided with a pressure reducing ring. The stay cord and slip casting stock further play the reinforcing action to the protecting wall, improve the impact resistance of protecting wall. The pressure reducing ring is an annular component formed by bending a steel pipe, and when the pulling force on the pulling rope reaches a set value, the pressure reducing ring absorbs energy through deformation and displacement, so that other components are prevented from being damaged, the protection wall is protected from overload, and the protection grade and the stability of the protection wall are improved.

Furthermore, the color steel plate is a double-layer sandwich color steel plate and has the characteristics of high strength and high stability.

The construction method is used for the safety protection device for secondary excavation of the existing side slope, and comprises the following steps:

s1, performing measurement setting-out on the outer side of the waveform guard rail of the existing side slope toe to be dug, digging a foundation pit of the upright post ground beam, embedding the prefabricated upright post ground beam into the foundation pit of the upright post ground beam, then nailing a screw steel nail into soil body below the upright post ground beam through the pipe hole, and backfilling, rolling and tamping soil body around the foundation pit of the upright post ground beam;

s2, connecting the color steel plate with the upright posts on the upright post ground beam, and then connecting the waveform guardrail with the color steel plate;

s3, carrying out measurement and setting-out on the platform of the existing side slope close to the slope surface side, excavating a strip-shaped foundation pit, embedding a prefabricated support ground beam into the strip-shaped foundation pit, and backfilling, rolling and tamping the soil body around the strip-shaped foundation pit; the first vertical steel pipe penetrates through the supporting ground beam and is installed in a soil body of the slope, and cement mortar is poured into the first vertical steel pipe;

s4, assembling the transverse steel pipes and the first vertical steel pipes into a first steel pipe bent frame through connecting fasteners, installing bamboo plywood on the first steel pipe bent frame, installing a second steel pipe bent frame and a steel wire mesh, and connecting the first steel pipe bent frame and the second steel pipe bent frame through steel pipe beams and the connecting fasteners; tensioning the pull rope through a grouting anchor rod to form a protective wall;

s5, repeating the steps S3-S4 until the construction of the protective walls of all the platforms is finished;

s6, performing secondary expanding excavation on the existing side slope from top to bottom, and excavating the expanded and excavated slope to form a primary protection level; when a platform close to an existing side slope with a protective wall is excavated, firstly, blocking objects on the inner side of the protective wall are cleaned, and then all structures of the protective wall are sequentially disassembled and shipped, wherein the excavated grouting anchor rod can be continuously utilized after surface concrete is broken, the excavated first vertical steel pipe and the lower grouting section can not be utilized and can be used for other purposes, and other components can be reused;

s7, excavating downwards in sequence, after the last stage of slope excavation is finished, removing the color steel enclosure in sequence, completely using the color steel enclosure to transport to the next section of slope to be expanded, replacing the part damaged and deformed component, and reusing the rest components; the safety protection device is constructed step by step from bottom to top, and the dismounting is synchronous from top to bottom. Compared with the traditional protective structure, the invention has the effect of comprehensive interception, and effectively solves the problem that the rock-soil body collapse or slide caused by the disturbance of the secondary excavation of the side slope influences the traffic safety of the lower road. The construction method has the advantages of simple construction process, short construction period and high construction efficiency, and the prefabricated upright post ground beam, the prefabricated support ground beam, the relevant color steel plate and the protective wall can be reused, thereby effectively reducing the construction cost.

The invention has the beneficial effects that:

1. according to the invention, the color steel enclosure and the protective wall intercept the rock-soil body collapsing or slipping down under the secondary excavation disturbance of the side slope in a segmented manner, so that the distance of the rock-soil body slipping is reduced, and the potential energy of the rock-soil body slipping is reduced; under multiple protection measures, the problem that rock-soil body collapse or sliding caused by secondary excavation disturbance of the side slope influences the traffic safety of the road on the lower portion is effectively solved.

2. The upright post ground beam and the supporting ground beam are prefabricated, and the protective wall and the color steel enclosure can be rapidly assembled and disassembled on site, so that the safety protection device can be repeatedly used, the construction cost is effectively reduced, the construction period is shortened, the construction efficiency is improved, and the construction process is simplified.

3. The wave-shaped guardrail disclosed by the invention has a protection effect on vehicles on a road, prevents the vehicles from directly impacting the color steel plate, and also has a protection effect on the color steel plate, so that the color steel plate is prevented from being impacted and damaged, and the interception effect of the color steel plate is further reduced.

4. The buffer rubber gasket has certain flexibility, can play roles of buffering, shock absorption and energy dissipation, improves the impact resistance and the blocking function of the color steel enclosure, and reduces the damage of the structure caused by impact.

5. The bamboo plywood and the steel wire mesh are combined, so that massive rock and soil bodies, small-particle-size fragments and small-scale slumped or collapsed soil particles can be effectively and comprehensively intercepted, and therefore the intercepting efficiency is improved; the objects intercepted by the two are different, the arrangement of the steel wire mesh avoids the problem that the bamboo plywood is stressed in a single direction, and the integral stability of the protective wall is improved; because a certain distance is reserved between the bamboo plywood and the steel wire mesh, the bamboo plywood has the energy dissipation and buffering effects.

6. The pull rope and the grouting anchor rod further play a role in reinforcing the protective wall, so that the impact resistance of the protective wall is improved; the pressure reducing ring is an annular component formed by bending a steel pipe, and when the pulling force on the pulling rope reaches a set value, the pressure reducing ring absorbs energy through deformation and displacement, so that other components are prevented from being damaged, the protection wall is protected from overload, and the protection grade and the stability of the protection wall are improved.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic structural view of a color steel enclosure.

Fig. 3 is a cross-sectional structure diagram of the upright post and the ground beam.

Fig. 4 is a schematic structural view of the screw-thread steel nail.

Fig. 5 is a schematic structural view of the protective wall.

Fig. 6 is a schematic structural view of the first steel pipe bent.

Fig. 7 is a structural schematic view of a second steel pipe bent.

Fig. 8 is a schematic view of the construction of the pull cord.

Labeled as:

1. enclosing with color steel; 2. a protective wall; 3. a road; 4. existing side slopes; 5. digging a side slope; 6. a platform;

101. color steel plates; 102. a column ground beam; 103. a steel upright post; 104. a waveform guardrail; 105. supporting steel; 106. a tube hole; 107. a screw-thread steel nail; 108. a steel washer; 109. a rubber gasket;

201. bamboo plywood; 202. a support ground beam; 203. a transverse steel pipe; 204. a first vertical steel pipe; 205. grouting holes; 206. connecting fasteners; 207. steel wire mesh; 208. a second vertical steel pipe; 209. a steel tubular beam; 210. pulling a rope; 211. grouting an anchor rod; 212. a pressure reducing ring.

Detailed Description

In the description of the present invention, it should be noted that the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention is further described below with reference to the accompanying drawings.

Example one

Referring to fig. 1, 2 and 3, the safety protection device for secondary excavation of the existing side slope is provided with two platforms 6 on the existing side slope, and comprises a color steel enclosure 1 arranged on the slope foot of the existing side slope 4 and a protection wall 2 arranged on the platform 6, wherein the color steel enclosure 1 comprises a color steel plate 101 arranged on the slope foot, a prefabricated upright post ground beam 102 is embedded in a soil body below the color steel plate, a steel upright post 103 is arranged in the upright post ground beam, and the color steel plate is connected with the steel upright post. The protective wall of the upper platform is used for blocking the falling objects of the slope rock-soil bodies during excavation of all levels of side slopes, and the color steel enclosure at the lower part is used for protecting the last level of side slope and the falling objects of the slope rock-soil bodies which cannot be intercepted at the upper part. According to the invention, the color steel enclosure and the protective wall intercept the rock-soil body collapsing or slipping down under the secondary excavation disturbance of the side slope in a segmented manner, and the distance of the rock-soil body slipping is reduced, so that the potential energy of the rock-soil body slipping is reduced. The upright post and the ground beam are prefabricated, so that the upright post and the ground beam can be repeatedly used in the process of gradual excavation of the side slope, the construction period and the construction cost are reduced, and the construction efficiency is improved; the color steel plate is plate-shaped, can effectively intercept large rock-soil bodies, small-particle-size fragments and small-scale collapsed or collapsed soil particles, and avoids the rock-soil bodies, the soil particles and the like from invading a traffic lane. The column ground beam of the embodiment is of a reinforced concrete structure prefabricated by C35 concrete and HRB400 steel bars, the size of the column ground beam is 40cm multiplied by 30cm, and the column ground beam is internally provided with steel bar hooks, so that the column ground beam is convenient to carry, load and unload.

Referring to fig. 2, in the present embodiment, a wave-shaped guardrail 104 is disposed on a side of the color steel plate close to the road, and the wave-shaped guardrail is connected to the color steel plate through a steel support 105. The wave form guardrail plays the guard action to the vehicle on the road, avoids the vehicle directly to strike various steel sheet, also plays the guard action to various steel sheet simultaneously, avoids various steel sheet to receive the striking damage and then reduces the interception effect of various steel sheet. The steel support of this embodiment adopts foraminiferous I-steel, and the ligature iron wire carries out the ligature with wave form guardrail and various steel sheet respectively through foraminiferous I-steel and is connected.

The embodiment is provided with cushion rubber gaskets (not shown in the figure) at both ends of the steel support. The cushion rubber gasket has certain flexibility, can play the effect of buffering, shock attenuation energy dissipation, improves the impact resistance and the function of blocking that the various steel encloses the cover, reduces the damage that the structure caused by the impact. The cushion rubber gaskets are adhered to two ends of the steel support.

Referring to fig. 2 and 3, in this embodiment, a plurality of pipe holes 106 vertically penetrating through the column floor beam are preset in the column floor beam, threaded steel nails 107 are arranged in the pipe holes, the threaded steel nails penetrate through the pipe holes and extend into the soil body below the column floor beam, and the heads of the threaded steel nails are sequentially provided with steel washers 108 and rubber gaskets 109 from top to bottom. The screw-thread steel nail plays the reinforcing effect to ground body around stand ground beam and the stand ground beam, improves the anchor power of stand ground beam, effectively strengthens various steel and encloses the overall stability who covers protective structure. When the blocking object impacts the color steel enclosure, the rubber gaskets at the threaded steel nail part can be coordinately deformed, and the displacement caused by multiple times of impact vibration on the upright post ground beam is reduced. In the embodiment, the number of the pipe holes 106 is four, and four screw steel nails penetrate through the pipe holes and are nailed into soil bodies below the ground beams of the upright posts by not less than 50 cm.

Referring to fig. 5, the protective wall 2 of the present embodiment includes a first square steel pipe bent and a bamboo plywood 201 laid on the first steel pipe bent, a prefabricated support ground beam 202 is provided in the soil body below the first steel pipe bent, and the first steel pipe bent is connected to the support ground beam. The bamboo plywood can intercept large rock-soil bodies and small-particle-size fragments which collapse or slide under the disturbance of secondary excavation of the side slope and small-scale collapsed or collapsed soil particles; because the supporting ground beam is prefabricated, the supporting ground beam can be repeatedly used in the process of gradual excavation of the side slope, the construction period and the construction cost are reduced, and the construction efficiency is improved. In the embodiment, preformed holes with the diameter of 70mm are arranged in the supporting ground beam at intervals of 100cm, and first vertical steel pipes with the diameter of 48mm are inserted into the preformed holes; the support ground beam is a cuboid, a reinforced concrete structure is prefabricated by C35 concrete and HRB400 steel bars, the size of the support ground beam is 300cm multiplied by 80cm multiplied by 100cm, and steel bar hooks are arranged in the support ground beam, so that the support ground beam is convenient to bind, carry, load and unload.

Referring to fig. 5 and 6, the first steel pipe bent frame of the present embodiment includes a horizontal steel pipe 203 and a vertical first vertical steel pipe 204, the horizontal steel pipe and the first vertical steel pipe are connected by a connecting fastener 206, and the first vertical steel pipe penetrates through the supporting ground beam and extends into the soil below the supporting ground beam; the side surface of the part of the first vertical steel pipe extending to the soil body is provided with a plurality of grouting holes 205. The first steel pipe bent erected by the steel pipes has the advantages of being high in strength and stability, cement mortar can be injected through the grouting holes, and anchoring force and stability of the supporting ground beam are improved. The transverse steel pipe of the embodiment adopts

The steel pipes with the lengths of 6m, 9m, 12m and 15m are determined according to integral multiples of the length of the single-piece supporting ground beam and convenience in transportation; the first vertical steel pipe adopts

A steel pipe having a length of not less than 3 m. The first steel pipe bent frames are arranged in a square mode, the distance between every two adjacent transverse steel pipes is 100cm, and the distance between every two adjacent first vertical steel pipes is 100 cm.

Referring to fig. 7, in this embodiment, a second steel pipe bent is arranged at a certain distance in the inner side of the first steel pipe bent close to the existing side slope, a steel wire mesh 207 is laid on the second steel pipe bent, the second steel pipe bent and the supporting ground beam are connected through bolts, the second steel pipe bent includes a plurality of vertically arranged second vertical steel pipes 208, and the second vertical steel pipes are connected with the first steel pipe bent through connecting fasteners through steel pipe beams 209. The steel wire mesh is used for intercepting large rock-soil bodies with the diameters larger than the meshes, and the bamboo plywood can intercept small-particle-size fragments and soil particles passing through the steel wire mesh. The combination of the two can effectively and comprehensively intercept large rock and soil masses, small-particle-size fragments and small-scale slumped or collapsed soil particles, thereby improving the interception efficiency. The objects intercepted by the two are different, the problem of unilateral stress of the bamboo plywood is avoided due to the arrangement of the steel wire gauze, and the overall stability of the protective wall is improved. Because a certain distance is reserved between the bamboo plywood and the steel wire mesh, the bamboo plywood has the energy dissipation and buffering effects. And the steel wire mesh and the second vertical steel pipes are bound and connected through binding iron wires, and the distance between every two adjacent second vertical steel pipes is 100 cm.

Referring to fig. 8, in the present embodiment, a pulling rope 210 is arranged on the first steel pipe bent, a grouting anchor rod 211 is arranged at an end of the pulling rope, the grouting anchor rod extends into an existing side slope, and the grouting anchor rod is perpendicular to a slope surface of the existing side slope; a pressure relief ring 212 is provided on the pull cord 210. The stay cord and slip casting stock further play the reinforcing action to the protecting wall, improve the impact resistance of protecting wall. The pressure reducing ring is an annular component formed by bending a steel pipe, and when the pulling force on the pulling rope reaches a set value, the pressure reducing ring absorbs energy through deformation and displacement, so that other components are prevented from being damaged, the protection wall is protected from overload, and the protection grade and the stability of the protection wall are improved. The grouting anchor rod and the horizontal plane form an included angle theta, the grouting anchor rod is inclined downwards, the included angle theta is not larger than 45 degrees, preferably 15-30 degrees, and the effective anchoring length is not smaller than 3 m.

The color steel plate 101 of the present embodiment is a double-layer sandwich color steel plate. The color steel plate adopts a double-layer sandwich color steel plate with the length of 2m and the height of 1.8m, a C-shaped steel structure is used as a framework, angle steel is used as support for fixing, the strength of the sandwich wallboard is fully utilized, and the shaped foam sandwich board enclosure is formed by connecting bolts, rivets and self-tapping screws.

Example two

The construction method is used for the safety protection device for secondary excavation of the existing side slope in the first embodiment, and comprises the following steps:

s1, performing measurement setting-out on the outer side of the waveform guard rail of the existing side slope toe to be dug, digging a foundation pit of the upright post ground beam, embedding the prefabricated upright post ground beam into the foundation pit of the upright post ground beam, then nailing a screw steel nail into soil body below the upright post ground beam through the pipe hole, and backfilling, rolling and tamping soil body around the foundation pit of the upright post ground beam;

s2, connecting the color steel plate with the upright posts on the upright post ground beam, and then connecting the waveform guardrail with the color steel plate;

s3, carrying out measurement and setting-out on the platform of the existing side slope close to the slope surface side, excavating a strip-shaped foundation pit, embedding a prefabricated support ground beam into the strip-shaped foundation pit, and backfilling, rolling and tamping the soil body around the strip-shaped foundation pit; the first vertical steel pipe penetrates through the supporting ground beam and is installed in a soil body of the slope, and cement mortar is poured into the first vertical steel pipe;

s4, assembling the transverse steel pipes and the first vertical steel pipes into a first steel pipe bent frame through connecting fasteners, installing bamboo plywood on the first steel pipe bent frame, installing a second steel pipe bent frame and a steel wire mesh, and connecting the first steel pipe bent frame and the second steel pipe bent frame through steel pipe beams and the connecting fasteners; tensioning the pull rope through a grouting anchor rod to form a protective wall;

s5, repeating the steps S3-S4 until the construction of the protective walls of all the platforms is finished;

s6, performing secondary expanding excavation on the existing side slope from top to bottom, and excavating the expanded and excavated slope to form a primary protection level; when a platform close to an existing side slope with a protective wall is excavated, firstly, blocking objects on the inner side of the protective wall are cleaned, and then all structures of the protective wall are sequentially disassembled and shipped, wherein the excavated grouting anchor rod can be continuously utilized after surface concrete is broken, the excavated first vertical steel pipe and the lower grouting section can not be utilized and can be used for other purposes, and other components can be reused;

s7, excavating downwards in sequence, after the last stage of slope excavation is finished, removing the color steel enclosure in sequence, completely using the color steel enclosure to transport to the next section of slope to be expanded, replacing the part damaged and deformed component, and reusing the rest components; the safety protection device is constructed step by step from bottom to top, and the dismounting is synchronous from top to bottom.

Compared with the traditional protective structure, the invention has the effect of comprehensive interception, and effectively solves the problem that the rock-soil body collapse or slide caused by the disturbance of the secondary excavation of the side slope influences the traffic safety of the lower road. The construction method has the advantages of simple construction process, short construction period and high construction efficiency, and the prefabricated upright post ground beam, the prefabricated support ground beam, the relevant color steel plate and the protective wall can be reused, thereby effectively reducing the construction cost.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Existing side slope secondary excavation safety device is provided with a plurality of platforms (6) on the existing side slope, its characterized in that includes:

the color steel enclosure (1) is arranged at the slope foot of the existing side slope (4) and is used for intercepting rock soil blocks and soil particles falling from the existing side slope;

the protective wall (2) is arranged on the platform (6) and used for intercepting rock soil blocks and soil particles falling from the existing side slope;

the color steel enclosure (1) comprises color steel plates (101) arranged on the slope toe, prefabricated upright post ground beams (102) are embedded in soil bodies below the color steel plates, steel upright posts (103) are arranged in the upright post ground beams, and the color steel plates are connected with the steel upright posts.

2. The safety device for the secondary excavation of the existing side slope as claimed in claim 1, wherein a corrugated guardrail (104) is arranged on one side of the color steel plate close to the road, and the corrugated guardrail is connected with the color steel plate through a steel support (105).

3. The existing side slope secondary excavation safety device of claim 2, wherein both ends of the steel support are provided with buffer rubber gaskets.

4. The safety protection device for secondary excavation of the existing side slope according to claim 1, wherein a plurality of pipe holes (106) vertically penetrating through the ground beam of the stand column are preset in the ground beam of the stand column, threaded steel nails (107) are arranged in the pipe holes, the threaded steel nails penetrate through the pipe holes and extend into soil below the ground beam of the stand column, and steel gaskets (108) and rubber gaskets (109) are sequentially arranged at the heads of the threaded steel nails from top to bottom.

5. The safety protection device for secondary excavation of the existing side slope as claimed in claim 1, wherein the protection wall (2) comprises a first square steel pipe bent and a bamboo plywood (201) laid on the first steel pipe bent, a prefabricated support ground beam (202) is arranged in a soil body below the first steel pipe bent, and the first steel pipe bent is connected with the support ground beam.

6. The safety protection device for secondary excavation of the existing side slope according to claim 5, wherein the first steel pipe bent frame comprises a horizontal steel pipe (203) and a vertical first vertical steel pipe (204), the horizontal steel pipe and the first vertical steel pipe are connected through a connecting fastener (206), and the first vertical steel pipe penetrates through the supporting ground beam and extends into soil below the supporting ground beam; the side surface of the part, extending to the soil body, of the first vertical steel pipe is provided with a plurality of grouting holes (205).

7. The safety protection device for secondary excavation of the existing side slope as claimed in claim 6, wherein the first steel pipe bent frame is provided with a second steel pipe bent frame at a certain interval close to the inner side of the existing side slope, a steel wire mesh (207) is laid on the second steel pipe bent frame, the second steel pipe bent frame is connected with the supporting ground beam through bolts, the second steel pipe bent frame comprises a plurality of second vertical steel pipes (208) which are vertically arranged, and the second vertical steel pipes are connected with the first steel pipe bent frame through connecting fasteners through steel pipe beams (209).

8. The safety protection device for secondary excavation of the existing side slope according to claim 5, wherein a pulling rope (210) is arranged on the first steel pipe bent, a grouting anchor rod (211) is arranged at the end of the pulling rope, the grouting anchor rod extends into the existing side slope, and the grouting anchor rod is perpendicular to the slope surface of the existing side slope; a pressure reducing ring (212) is provided on the pull cord (210).

9. The safety protection device for secondary excavation of the existing side slope as claimed in any one of claims 1 to 8, wherein the color steel plate (101) is a double-layer sandwich color steel plate.

10. The construction method is used for the safety protection device for secondary excavation of the existing side slope, and is characterized by comprising the following steps of:

s1, performing measurement setting-out on the outer side of the waveform guard rail of the existing side slope toe to be dug, digging a foundation pit of the upright post ground beam, embedding the prefabricated upright post ground beam into the foundation pit of the upright post ground beam, then nailing a screw steel nail into soil body below the upright post ground beam through the pipe hole, and backfilling, rolling and tamping soil body around the foundation pit of the upright post ground beam;

s2, connecting the color steel plate with the upright posts on the upright post ground beam, and then connecting the waveform guardrail with the color steel plate;

s3, carrying out measurement and setting-out on the platform of the existing side slope close to the slope surface side, excavating a strip-shaped foundation pit, embedding a prefabricated support ground beam into the strip-shaped foundation pit, and backfilling, rolling and tamping the soil body around the strip-shaped foundation pit; the first vertical steel pipe penetrates through the supporting ground beam and is installed in a soil body of the slope, and cement mortar is poured into the first vertical steel pipe;

s4, assembling the transverse steel pipes and the first vertical steel pipes into a first steel pipe bent frame through connecting fasteners, installing bamboo plywood on the first steel pipe bent frame, installing a second steel pipe bent frame and a steel wire mesh, and connecting the first steel pipe bent frame and the second steel pipe bent frame through steel pipe beams and the connecting fasteners; tensioning the pull rope through a grouting anchor rod to form a protective wall;

s5, repeating the steps S3-S4 until the construction of the protective walls of all the platforms is finished;

s6, performing secondary expanding excavation on the existing side slope from top to bottom, and excavating the expanded and excavated slope to form a primary protection level; when a platform close to an existing side slope with a protective wall is excavated, firstly, blocking objects on the inner side of the protective wall are cleaned, and then all structures of the protective wall are sequentially disassembled and shipped, wherein the excavated grouting anchor rod can be continuously utilized after surface concrete is broken, the excavated first vertical steel pipe and the lower grouting section can not be utilized and can be used for other purposes, and other components can be reused;

s7, excavating downwards in sequence, after the last stage of slope excavation is finished, removing the color steel enclosure in sequence, completely using the color steel enclosure to transport to the next section of slope to be expanded, replacing the part damaged and deformed component, and reusing the rest components; the safety protection device is constructed step by step from bottom to top, and the dismounting is synchronous from top to bottom.

Images