CN111549804A - Cutting slope reinforced passive protection system and construction method thereof - Google Patents
Cutting slope reinforced passive protection system and construction method thereof Download PDFInfo
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- CN111549804A CN111549804A CN202010455414.9A CN202010455414A CN111549804A CN 111549804 A CN111549804 A CN 111549804A CN 202010455414 A CN202010455414 A CN 202010455414A CN 111549804 A CN111549804 A CN 111549804A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/202—Securing of slopes or inclines with flexible securing means
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Abstract
The invention discloses a cutting slope reinforced passive protection system which comprises a cutting wall, a reinforced gabion retaining wall and a passive protective net, wherein the cutting wall is arranged at the toe of a cutting slope, the reinforced gabion retaining wall is arranged at the top of the cutting wall, and the passive protective net is arranged at the top of the reinforced gabion retaining wall; the reinforced gabion retaining wall is composed of a plurality of reinforced gabions, and adjacent reinforced gabions are connected through a folded steel wire rope and/or a buckle; the passive protective net comprises a base, and is fixed on the retaining wall of the reinforced gabion through a plurality of spaced bases; set up a plurality of base through-holes on the base, correspond to the vertical many PVC pipes that set up in position of base through-hole in the retaining wall of steel reinforcement gabion, the intraductal steel pipe that is provided with of PVC, the steel pipe runs through base through-hole and expends the base, is provided with cement mortar in the steel pipe. The invention is applied to the broken rock cutting slope and can effectively protect the steel column base from falling rocks.
Description
Technical Field
The invention relates to the field of geotechnical engineering, is suitable for broken rock cutting slopes, and particularly relates to a cutting slope reinforced passive protection system and a construction method.
Background
According to the existing specifications, a steel wire rope anchor rod is used as a pull anchor rod in highway slope flexible protection system components (JT/T528-2004) and railway line slope flexible safety protection nets (TB/T3089-2004), a pit is formed in a covering layer at the rear end of the steel wire rope anchor rod, a construction anchor hole is subjected to grouting, the steel wire rope is folded to form the steel wire rope anchor rod, the steel wire rope anchor rod is placed into the anchor hole, a steel wire rope ring sleeve formed by folding the steel wire rope penetrates through an upper pull anchor rope, a side pull anchor rope and a middle reinforcing pull anchor rope, the broken rock cutting slope is taken out after being drilled by an air gun or a drilling machine, the steel wire rope anchor rod is easily subjected to drilling blockage and hole collapse in the process of placing the steel wire rope anchor rod into the anchor hole, the anchor hole construction difficulty is high.
The height of the existing passive protective net is generally not more than 6m, and the protective height is limited.
Broken rock matter cutting side slope height and when top natural slope is great, the rock fall potential energy turns into kinetic energy, and the rock fall impact force is great, and current passive protective screen draws the anchor rope and generally sets up 1 ~ 2 pressure reducing rings on the net, very easily causes pressure reducing ring, grid, annular net and steel column to damage under the rock fall impact force effect, and passive protection network protective effect is not good.
The technical scheme of the prior published utility model patent (composite protective structure based on the combination of a steel wire gabion and a passive flexible protective net) (grant publication number: CN 208440998U) is as follows: including metal flexible net and steel column, the steel column interval sets up, metal flexible net is fixed to be set up between the steel column, the steel column bottom is fixed through the base and is located on the side slope, the steel column top is through drawing the anchor rope and anchor, metal flexible net top is through last stay rope fixed connection on the steel column, metal flexible net bottom is through under bracing rope fixed connection on the steel column, one side that leans on the side slope rockfall direction bottom the steel column is provided with the steel wire gabion, the steel wire gabion sets one row along the direction of side slope protective structure distribution line. The utility model discloses an increase steel wire gabion flexible construction, suitably protect the protection network bottom, reducible protection network steel column base is connected the emergence of destroying, the condition such as net piece quilt breaking.
To broken rock matter cutting side slope height and when the top natural slope is great, the great condition of falling rock impact force, above-mentioned utility model patent fails effectively to avoid the great falling rock of impact force to the destruction of steel column base.
Disclosure of Invention
The invention aims to solve the technical problems that in the protection and construction of broken rock cutting side slopes, steel column bases are easily damaged by falling rock impact, and broken rock cutting side slopes are easily subjected to hole collapse and drill clamping in the anchor hole of a steel wire rope anchor rod in the construction process.
The invention is realized by the following technical scheme:
a cutting slope reinforced passive protection system comprises a cutting wall, a reinforcement gabion retaining wall and a passive protection net, wherein the cutting wall is arranged at the slope toe of the cutting slope, the reinforcement gabion retaining wall is arranged at the top of the cutting wall, and the passive protection net is arranged at the top of the reinforcement gabion retaining wall; the reinforced gabion retaining wall is composed of a plurality of reinforced gabions, and adjacent reinforced gabions are connected through a folded steel wire rope and a buckle; the passive protective net comprises a self-advancing hollow grouting anchor rod, anchor pulling ropes, upper supporting ropes, lower supporting ropes, an annular net, a grid, steel columns and bases, the passive protective net is fixed to the top of the retaining wall of the reinforced gabion through a plurality of spaced bases, each base is provided with the steel column, the top of each steel column is connected with the self-advancing hollow grouting anchor rod through the anchor pulling ropes for anchoring, the upper supporting ropes and the lower supporting ropes are fixedly arranged between every two adjacent steel columns, the annular net and the grid are arranged between the upper supporting ropes and the lower supporting ropes, the annular net is located on one side close to a side slope, and the grid is located on one side far away from the side slope; the steel bar gabion retaining wall is characterized in that a plurality of base through holes are formed in the base, a plurality of PVC pipes are vertically arranged in the positions, corresponding to the base through holes, of the steel bar gabion retaining wall, steel pipes are arranged in the PVC pipes and penetrate through the base through holes and extend out of the base, and cement mortar is arranged in the steel pipes.
The invention is suitable for the broken rock cutting slope. Set up reinforcing bar gabion retaining wall at cutting wall top to set up the passive protection network of strenghthened type at reinforcing bar gabion retaining wall top, the effective protection height of passive protection system has been increased, and consumption through the flexible deformation of the fifty percent discount wire rope of connecting the reinforcing bar gabion and the deformation of reinforcing bar gabion self, absorb partly kinetic energy, absorb rock fall impact energy through reinforcing bar gabion retaining wall, reduce the destruction of rock fall to steel column base and cutting wall with the flexibility.
According to the invention, the PVC pipe is sleeved in the steel reinforcement gabion to connect the steel pipe, cement mortar is poured into the steel pipe, the steel pipe extends out of the surface of the base for a certain distance, and the stability of the base is improved. Because the steel column connection sets up on the base, has just also added the steadiness at steel column base.
The invention does not adopt a steel wire rope anchor rod suggested by a standard, but adopts a self-advancing hollow grouting anchor rod, the self-advancing hollow grouting anchor rod is used as a drill rod and a grouting pipe, a dust blowing pipe can be used before grouting, dust formed by rock drilling is removed, grout is sprayed out from a drill bit through the hollow anchor rod during grouting to fill drilled holes and stratum cracks around the anchor rod, so that the anchor rod and surrounding soil are solidified into a whole to form a steel pipe cement column to play a role in reinforcement, the problems of easy drilling and hole collapse during the construction of broken rock slope anchor holes are effectively solved, the integrated functions of drilling, grouting, anchoring and the like of the self-advancing hollow grouting anchor rod are fully exerted, and the self-advancing hollow grouting anchor rod and the hollow grouting anchor rod are connected in an exposed ring sleeve (folded steel wire rope) through a U-shaped buckle.
Further, the anchor rope draws is strengthened drawing the anchor rope in the middle including last anchor rope, side drawing anchor rope and centre, the centre strengthen drawing the anchor rope with the side drawing anchor rope is located the one side of side slope is kept away from to the passive protection network, the centre is strengthened drawing the self-advancing formula cavity slip casting stock that the anchor rope is connected with the side drawing the self-advancing formula cavity slip casting stock that the anchor rope is connected all is located in the cutting wall body, it is located to go up the anchor rope passive protection network is close to one side of side slope, with the self-advancing formula cavity slip casting stock that the anchor rope is connected is located the side slope basal body. Through supporting the protection to the steel column multidirectionally, ensure the steadiness of steel column.
Further, one or more pressure reducing rings are arranged on the pull-up mooring line. The pressure reducing ring arranged on the upper pull anchor rope can effectively reduce the impact force of falling rocks on the grating and the annular net, and greatly prolongs the service life of the grating and the annular net.
Furthermore, the self-propelled hollow grouting anchor rod comprises a hollow anchor rod body, a grout stop plug, a backing plate, a nut, a U-shaped buckle and an exposed ring sleeve, wherein the grout stop plug is sleeved at the tail part of the hollow anchor rod body, the grout stop plug is fixed on the hollow anchor rod body through the backing plate in a positioning mode, the backing plate is fixedly positioned on the hollow anchor rod body through the nut, the exposed ring sleeve is fixed at the tail end of the hollow anchor rod body through the U-shaped buckle, and the exposed ring sleeve is sleeved on the anchor pulling rope.
Furthermore, the exposed ring sleeve is a folded steel wire rope.
Furthermore, the anchor head of the self-propelled hollow grouting anchor rod is an alloy drill bit.
Further, the steel pipe extends out of the surface of the base by 0.2m-0.5 m.
Furthermore, a plurality of drain holes are formed in the cutting wall, and the drain holes are arranged at intervals in a quincunx shape.
Furthermore, plain shotcrete on the surface of the reinforced gabion retaining wall prevents reinforcing steel bars from being corroded.
Another implementation of the invention:
a construction method of a cutting slope reinforced passive protection system comprises a cutting wall, a reinforced gabion retaining wall and a passive protection network, wherein the passive protection network comprises a self-propelled hollow grouting anchor rod, a grout stop plug, a base plate, a nut, a U-shaped buckle, a hollow grouting anchor rod exposed ring sleeve, a pull anchor rope, a pressure reducing ring, an upper support rope, a lower support rope, an annular net, a grid, a steel column, a base, a steel pipe and a PVC pipe;
the construction method comprises the following steps:
s1: constructing a cutting wall at the cutting slope toe, and arranging drain holes at intervals in the cutting wall;
s2: welding reinforcement gabions, installing and fixing a plurality of vertical PVC pipes in the reinforcement gabions according to the positions of the bases corresponding to the reinforcement gabions, and filling block stones into the reinforcement gabions;
s3: hoisting the reinforcement gabions filled with the stones to the top of the cutting wall and the cutting table, and connecting adjacent reinforcement gabions through a steel wire rope and a buckle when hoisting one layer of reinforcement gabions to form a reinforcement gabion retaining wall;
s4: after the hoisting is finished, plain-sprayed concrete is sprayed on the surface of the reinforced gabion retaining wall;
s5: inserting a steel pipe into each PVC pipe, wherein the steel pipe is longer than the PVC pipe and extends out of the PVC pipe;
s6: arranging a plurality of bases on the reinforcement gabion retaining wall at intervals, arranging a plurality of through holes on the bases, and enabling the steel pipes to penetrate through the through holes and extend to 0.2-0.5 m from the surface of each base;
s7: pouring cement mortar into the steel pipe;
s8: the concrete position of the self-advancing hollow grouting anchor rod is determined through measurement, the self-advancing hollow grouting anchor rod is drilled through the self-advancing hollow grouting anchor rod according to the measured position, the self-advancing hollow grouting anchor rod is exposed out of the ground by 0.1-0.3 m, a phi 25, phi 28 or phi 32 hollow full-thread rod body with the length of 3-6 m is adopted according to the pulling resistance and the rock mass crushing degree, the anchor head of the self-advancing hollow grouting anchor rod is an alloy drill bit, and a grout stop plug, a cushion plate and a nut are sequentially arranged at the rear end of the self-advancing hollow grouting anchor rod;
s9: pouring cement mortar into the middle part of the self-propelled hollow grouting anchor rod, wherein the grouting pressure of the slurry is 1-1.5 MPa;
s10: the steel wire rope is folded to form a hollow grouting anchor rod exposed ring sleeve, and the rear end of the self-advancing hollow grouting anchor rod and the hollow grouting anchor rod exposed ring sleeve are fixedly connected by utilizing a U-shaped buckle;
s11: the method comprises the following steps that a steel column and an anchor pulling rope are sequentially installed, wherein the anchor pulling rope comprises an upper anchor pulling rope, a side anchor pulling rope and a middle reinforcing anchor pulling rope, and one or more pressure reducing rings are arranged on the upper anchor pulling rope;
s12: and installing an upper supporting rope and a lower supporting rope, and then installing an annular net and a grid.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the steel reinforcement gabion retaining wall is rigid in a soft way, falling rock impact energy is absorbed, and damage of falling rocks to a steel column base and a cutting wall is reduced;
2. the stability of the base and the retaining wall of the reinforced gabion is enhanced by sleeving the PVC pipe with the steel pipe and pouring cement mortar into the steel pipe, namely, the steel column base is stabilized;
3. the self-advancing hollow grouting anchor rod is adopted for anchoring, so that drill jamming and hole collapse in the process of constructing the anchor hole of the broken rock slope are avoided;
4. the construction efficiency is improved, the construction period is shortened, and reference is provided for design and construction of the passive protective net.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic cross-sectional view of a cutting slope enhanced passive protection system;
FIG. 2 is a partial enlarged view of the cross section of a cutting slope reinforced passive protection system;
FIG. 3 is a schematic elevation view of a cutting slope enhanced passive protection system;
FIG. 4 is a schematic top view of a cutting slope enhanced passive protection system base and a reinforced gabion retaining wall;
FIG. 5 is a schematic cross-sectional view of a self-advancing hollow grouting anchor and an exposed loop connecting device of the hollow grouting anchor;
fig. 6 is a schematic view of a hollow grouting anchor rod, a connecting rope and a U-shaped buckle.
Reference numbers and corresponding part names in the drawings:
1-cutting slope reinforced passive protection system, 2-annular net, 3-grating, 4-base, 5-side pull anchor rope (double rope) or middle reinforced pull anchor rope (single rope), 6-doubling steel wire rope, 7-U type buckle, 8-hollow grouting anchor rod, 9-decompression ring, 10-upper pull anchor rope (double rope), 11-steel column, 12-steel tube, 13-cement mortar, 14-reinforced gabion retaining wall, 15-plain concrete, 16-cutting wall, 17-water drain hole, 18-ditch bottom, 19-shoulder, 20-road surface, 21-road center line, 22-side pull anchor rope (double rope), 23-middle reinforced pull anchor rope (single rope), 24-upper supporting rope (double rope), 25-lower supporting rope (double rope), 26-retaining wall settlement joint, 27-alloy drill bit, 28-hollow full-thread rod body, 29-grout stop plug, 30-backing plate, 31-hollow grouting anchor rod nut, 32-U-shaped buckle nut and 33-PVC pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, the present embodiment 1 is a cutting slope reinforced passive protection system 1 including a cutting wall 16 (wall height 4-8 m), a reinforcement gabion retaining wall 14 (wall height 2-4 m), and a reinforced passive protection net. The reinforced passive protective net comprises a phi 25 self-advancing hollow grouting anchor rod 88, a grout stop plug 29, a base plate 30, a hollow grouting anchor rod nut 31, a U-shaped buckle 7, a hollow grouting anchor rod exposed ring sleeve 6 (phi 18 folded steel wire ropes), phi 18 pull-up anchor ropes 10 (double ropes, three decompression rings 9), phi 18 pull-side anchor ropes 22 (double ropes), phi 18 middle reinforcing pull-anchor ropes 23 (single rope), phi 22 upper supporting ropes 24 (double ropes), phi 22 lower supporting ropes 25 (double ropes), an annular net 2, an SO/2.2/50 grid 3, a steel column 11, a base 4, a vertical phi 300 steel pipe 12 (wall thickness of 5cm), a PVC pipe 33 (outer diameter of 350mm, wall thickness of 2 cm).
Cutting wall 16 slope 4 degrees angles rely on the slope setting, and cutting wall 16 wall bottom surface is less than side ditch bottom surface 18. The gutter is located between the cutting wall 16 and the shoulder 19, on the other side of the shoulder 19 is a road surface 20 and on the other side of the road surface 20 is a road course 21. Cutting wall 16 top sets up reinforced concrete gabion retaining wall 14, and reinforced concrete gabion retaining wall 14 and side slope form the contained angle, and the side slope base is less than reinforced concrete gabion retaining wall 14's topside, and is higher than reinforced concrete gabion retaining wall 14's base. When falling rocks fall from the side slope, the falling rocks first contact the reinforcement gabion retaining wall 14 of the passive protection system.
This passive protection system of cutting side slope strenghthened type combines cutting wall 16, reinforcing bar gabion retaining wall 14, the passive protection network of strenghthened type organically, and the respective advantage of full play cutting wall 16, reinforcing bar gabion retaining wall 14, the passive protection network of strenghthened type sets up cutting wall 16 at cutting side slope toe. Set up the outlet 17 (phi 100PVC pipe) in the cutting wall 16 wall body, interval 3 x 3m, plum blossom shape is arranged, and the outlet 17 runs through cutting wall 16 wall body, and the water drainage of side slope one side is to cutting wall 16 one side that is close to the side ditch, and the rethread side ditch is with water drainage. The cutting wall 16 contains retaining wall settlement joints 26 in the wall. 4 vertical PVC pipes 33 (the outer diameter is 350mm, and the wall thickness is 2cm) are fixed at the position of each passive protection net base 4 in a steel bar gabion. And then loading the boulders into the reinforcement gabion by using a loader. The reinforced gabion retaining wall 14 is transported to the top of the cutting wall 16 and the cutting table, and the reinforced gabion is connected with the buckle through the phi 18 doubling steel wire rope 6. C20 concrete 15 (10 cm in thickness) is sprayed on the surface of the reinforced gabion retaining wall 14. And (3) inserting a phi 300 steel pipe 12 (with the length of 2-4 m, the outer diameter of 300mm and the wall thickness of 5cm) into a vertical PVC pipe 33 (with the outer diameter of 350mm and the wall thickness of 2 cm). As shown in fig. 4, a reinforced passive protection net base 4 (with the size of 1 × 1 × 0.02m) is placed on the top of a retaining wall 14 of a reinforcement gabion, each base 4 is provided with 4 round holes with the aperture of 310mm, the 4 round holes of the base 4 penetrate through 4 steel pipes 12 arranged on the top of the reinforcement gabion respectively, and the steel pipes 12 are exposed out of the surface of the base 4 by at least 0.3 m. And then constructing a reinforced passive protective net at the top of the reinforced gabion. The method increases the effective protection height of a passive protection system, reduces the damage of falling rocks to a steel column 11 column base and a cutting wall 16 through the flexible deformation of a phi 18 doubling steel wire rope 6 connected with a steel bar gabion and the deformation consumption and absorption of part of kinetic energy of the steel bar gabion, reduces the impact of the falling rocks to a grid 3 and an annular net 2 by arranging three pressure reducing rings 9 on an upper pull anchor rope 10 (double ropes), greatly prolongs the service lives of the grid 3 and the annular net 2, can effectively solve the problems of easy drilling and hole collapse during the construction of broken rock slope anchor holes by adopting the self-propelled hollow grouting anchor rod 8, fully exerts the integrated functions of drilling, grouting, anchoring and the like of the self-propelled hollow grouting anchor rod 8 and the hollow grouting anchor rod exposed outside 6 (phi 18 doubling steel wire rope) through the U-shaped buckle nut 32 on the U-shaped buckle 7 to fix and connect the self-propelled hollow grouting anchor rod 8 and the self-propelled hollow steel wire rope through the U-shaped buckle 7 The grouting anchor rod 8 and the hollow grouting anchor rod exposed ring sleeve 6), and the hollow grouting anchor rod exposed ring sleeve 6 is connected with the upper anchor pulling rope 10, the side anchor pulling rope 22 and the middle reinforcing anchor pulling rope 23, so that the construction efficiency is improved, the construction period is shortened, and reference is provided for design and construction of a passive protective net.
Example 2
In this embodiment 2, on the basis of embodiment 1, a construction method of a cutting slope reinforced passive protection system includes the following steps:
1. a cutting wall 16 is constructed at the cutting slope toe, and the wall height is 4-8 m. The cutting wall 16 is provided with drain holes 17 (phi 100PVC pipes) which are arranged at intervals of 3 multiplied by 3m in a quincunx manner.
2. And welding a reinforcement gabion, and installing and fixing the vertical PVC pipe 33 in the reinforcement gabion.
3. 4 vertical PVC pipes 33 (the outer diameter is 350mm, and the wall thickness is 2cm) are fixed at the position of each passive protective net base 4 in the reinforced gabion.
4. The reinforcing steel bar gabion is filled with the stone blocks manually or mechanically, and the vertical PVC pipes 33 are protected when the stone blocks are filled.
5. And hoisting the reinforcement gabion to the top of the cutting wall 16 and the crushing platform by using a crane.
6. When a layer of reinforcement gabion is hoisted, the steel wire rope 6 is folded in half through phi 18 and the adjacent reinforcement gabions are connected through buckles.
7. When the reinforcement gabion is hoisted to the design height, a reinforcement gabion retaining wall 14 (with the wall height of 2-4 m) is formed. The steel reinforcement gabion retaining wall 14 is connected with the adjacent steel reinforcement gabion on surface through a phi 18 doubling steel wire rope 6 and a U-shaped buckle 7. After the hoisting is finished, C20 concrete 15 with the thickness of 10cm is sprayed on the surface of the reinforced gabion retaining wall 14 in an open mode, and the reinforcing steel bars are prevented from being corroded.
8. 4 vertical phi 300 steel pipes 12 (length 2-4 m, outer diameter 300mm and wall thickness 5cm) corresponding to each base 4 of the reinforced passive protective net are respectively inserted into 4 vertical PVC pipes 33 (outer diameter 350mm and wall thickness 2 cm).
9. The reinforced passive protective screening base 4 (with the size of 1 multiplied by 0.02m) is arranged at the top of the retaining wall 14 of the reinforced gabion, each base 4 is provided with 4 round holes with the aperture of 310mm, the 4 round holes of the base 4 penetrate through 4 steel pipes 12 arranged at the top of the reinforced gabion respectively, and the steel pipes 12 are exposed out of the surface of the base 4 by at least 0.3 m. M30 cement mortar 13 is injected into the steel pipe 12. As shown in fig. 4.
10. The specific position of the anchor rod of the passive protective net, namely the self-propelled hollow grouting anchor rod 8, is determined through measurement.
11. The self-propelled hollow grouting anchor rod 8 adopts a hollow full-thread rod body 28 with the length of phi 25, phi 28 or phi 32 of 3-6 m according to the pulling resistance and the rock mass crushing degree. The alloy drill bit 27 is arranged at the front end of the hollow full-thread rod body 28 to form the self-advancing hollow grouting anchor rod 8.
12. The self-advancing hollow grouting anchor rod 8 is fixed on the air gun or the drilling machine at the anchor hole position by using the air gun or the drilling machine, the self-advancing hollow grouting anchor rod 8 (the head of the hollow full-thread rod body 28 is provided with the alloy drill bit 27) is used for drilling, and the air gun or the drilling machine is only required to be taken down without pulling out after the self-advancing hollow grouting anchor rod 8 is drilled, so that the problems of easy drilling clamping and hole collapse when the air gun or the drilling machine is used for drilling in the broken rock cutting slope are avoided. The self-advancing hollow grouting anchor rod 8 is exposed out of the ground by 0.2 m.
13. The back end of the self-advancing hollow grouting anchor rod 8 is provided with a grout stop plug 29, a backing plate 30 and a nut 31. As shown in fig. 5.
14. M30 cement mortar 13 is poured into the middle part of the self-propelled hollow grouting anchor rod 8. The grouting pressure of the slurry is 1-1.5 MPa.
15. And (3) folding the phi 18 folded steel wire rope 6 to form a hollow grouting anchor rod exposed ring sleeve 6, and fixedly connecting the rear end of the self-advancing hollow grouting anchor rod 8 and the hollow grouting anchor rod exposed ring sleeve 6 by rotating a U-shaped buckle nut 32 on the U-shaped buckle 7. As shown in fig. 5 and 6.
16. The installation steel column 11, the upper anchor pulling rope 10, the side anchor pulling rope 22 and the middle reinforcement anchor pulling rope 23. The pull-up anchor line 10 is provided with 3 pressure relief rings 9.
17. The upper support line 24 and the lower support line 25 are installed.
18. The ring network 2 is installed.
19. The grid 3 is installed.
The U-shaped buckle 7 in the above embodiments is not limited to a U-shape, and may be other buckle structures having the same function.
The invention can also realize the aim by adopting the methods of reinforced self-advancing anchor rod lattice beams, anchor bar lattice beams, reinforced hanging net spray anchor support and the like of the broken rock slope, but the construction difficulty is higher, the construction period is longer, and the construction cost is higher.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A cutting slope reinforced passive protection system is characterized by comprising a cutting wall (16), a reinforcement cage retaining wall (14) and a passive protective net, wherein the cutting wall (16) is arranged at the toe of a cutting slope, the reinforcement cage retaining wall (14) is arranged at the top of the cutting wall (16), and the passive protective net is arranged at the top of the reinforcement cage retaining wall (14);
the reinforced gabion retaining wall (14) is composed of a plurality of reinforced gabions, and adjacent reinforced gabions are connected through a folded steel wire rope (6) and a buckle (7);
the passive protective net comprises a self-advancing hollow grouting anchor rod (8), an anchor pulling rope, an upper supporting rope (24), a lower supporting rope (25), an annular net (2), a grating (3), a steel column (11) and a base (4), the passive protective net is fixed on the top of the retaining wall (14) of the reinforced gabion through a plurality of spaced bases (4), each base (4) is provided with a steel column (11), the top of each steel column (11) is connected with a self-advancing hollow grouting anchor rod (8) through an anchor pulling rope for anchoring, an upper supporting rope (24) and a lower supporting rope (25) are fixedly arranged between every two adjacent steel columns (11), an annular net (2) and a grating (3) are arranged between the upper supporting rope (24) and the lower supporting rope (25), the annular net (2) is positioned at one side close to the side slope, and the grating (3) is positioned at one side far away from the side slope;
set up a plurality of base through-holes on the base, the internal corresponding to of steel reinforcement gabion retaining wall the vertical many PVC pipes (33) that set up in position of base through-hole, be provided with steel pipe (12) in PVC pipe (33), steel pipe (12) run through the base through-hole and expenditure base (4), be provided with cement mortar (13) in steel pipe (12).
2. The cut slope enhanced passive protection system according to claim 1, wherein the anchor pulling rope comprises an upper anchor pulling rope (10), a side anchor pulling rope (22) and a middle anchor pulling rope (23), the middle anchor pulling rope (23) and the side anchor pulling rope (22) are located on one side of the passive protection net far away from the slope, the self-advancing hollow grouting anchor rod (8) connected with the middle anchor pulling rope (23) and the self-advancing hollow grouting anchor rod (8) connected with the side anchor pulling rope (22) are both located in the wall of the cut wall (16), the upper anchor pulling rope (10) is located on one side of the passive protection net close to the slope, and the self-advancing hollow grouting anchor rod (8) connected with the upper anchor pulling rope (10) is located in the base of the slope.
3. The cut slope enhanced passive protection system according to claim 2, wherein one or more pressure reducing rings (9) are provided on the pull-up anchor line (10).
4. The cutting slope enhanced passive protection system according to claim 1, wherein the self-advancing hollow grouting anchor rod (8) comprises a hollow anchor rod body (28), a grout stop plug (29), a backing plate (30), a nut (31), a U-shaped buckle (7) and an exposed ring sleeve (6), the grout stop plug (29) is sleeved on the tail portion of the hollow anchor rod body (28), the grout stop plug (29) is fixed on the hollow anchor rod body (28) through the backing plate (30), the backing plate (30) is fixed and positioned on the hollow anchor rod body (28) through the nut (31), the exposed ring sleeve (6) is fixed at the tail end of the hollow anchor rod body (28) through the U-shaped buckle (7), and the exposed ring sleeve (6) is sleeved on the anchor rope.
5. The cut slope enhanced passive protection system according to claim 4, wherein the exposed loop is a folded steel wire rope (6).
6. The cut slope enhanced passive protection system according to claim 4, wherein the anchor head of the self-propelled hollow grouting anchor rod (8) is an alloy drill bit (27).
7. The cut slope enhanced passive protection system according to claim 1, wherein the steel pipe (12) extends 0.2-0.5 m from the surface of the base (4).
8. The cutting slope enhanced passive protection system according to claim 1, wherein a plurality of drainage holes (17) are formed in the cutting wall (16), and the drainage holes (17) are arranged at intervals in a quincunx shape.
9. The cut slope enhanced passive protection system of claim 1, wherein concrete (15) is sprayed on the surface of the reinforcement cage retaining wall (14).
10. A cutting slope reinforced passive protection system construction method is characterized in that the cutting slope reinforced passive protection system comprises a cutting wall (16), a reinforced gabion retaining wall (14) and a passive protective net, wherein the passive protective net comprises a self-propelled hollow grouting anchor rod (8), a grout stop plug (29), a backing plate (30), a nut (31), a U-shaped buckle (7), a hollow grouting anchor rod exposed ring sleeve (6), an anchor pulling rope, a pressure reducing ring (9), an upper support rope (24), a lower support rope (25), an annular net (2), a grid (3), a steel column (11), a base (4), a steel pipe (12) and a PVC pipe (33);
the construction method comprises the following steps:
s1: constructing a cutting wall (16) at the cutting slope toe, and arranging drain holes (17) in the wall body of the cutting wall (16) at intervals;
s2: welding a reinforcement gabion, installing and fixing a plurality of vertical PVC pipes (33) in the reinforcement gabion according to the position of each base (4) corresponding to the reinforcement gabion, and filling the reinforcement gabion with block stones;
s3: hoisting the reinforcement gabions filled with the stones to the top of the cutting wall (16) and the cutting table, and connecting the adjacent reinforcement gabions through the steel wire rope (16) and the buckle (7) in a folded manner to form a reinforcement gabion retaining wall (14) when each layer of reinforcement gabions is hoisted;
s4: after the hoisting is finished, plain-spraying concrete (15) on the surface of the reinforced gabion retaining wall (14);
s5: inserting a steel pipe (12) into each PVC pipe (33), wherein the steel pipe (12) is longer than the PVC pipe (33) and the PVC pipe (33) is extended;
s6: a plurality of bases (4) are arranged on the reinforcement gabion retaining wall (14) at intervals, a plurality of through holes are formed in the bases (4), and the steel pipes (12) penetrate through the through holes and extend out of the surface of each base (4) by 0.2-0.5 m;
s7: pouring cement mortar (13) into the steel pipe (12);
s8: the concrete position of a self-advancing hollow grouting anchor rod (8) is determined through measurement, the self-advancing hollow grouting anchor rod is drilled according to the measured position, the self-advancing hollow grouting anchor rod (8) is exposed out of the ground by 0.1-0.3 m, a 3-6 m long phi 25, phi 28 or phi 32 hollow full-thread rod body (28) is adopted according to the pulling resistance and the rock mass crushing degree, the anchor head of the self-advancing hollow grouting anchor rod is an alloy drill bit (27), and a grout stop plug (29), a cushion plate (30) and a nut (31) are sequentially arranged at the rear end of the self-advancing hollow grouting anchor rod (8);
s9: cement mortar is poured into the middle part of the self-advancing hollow grouting anchor rod (8), and the grouting pressure of the grout is 1-1.5 MPa;
s10: the steel wire rope is folded to form a hollow grouting anchor rod exposed ring sleeve (6), and the rear end of the self-advancing hollow grouting anchor rod and the hollow grouting anchor rod exposed ring sleeve (6) are fixedly connected by utilizing a U-shaped buckle (7);
s11: the method comprises the following steps that a steel column (11) and anchor pulling ropes are sequentially installed, each anchor pulling rope comprises an upper anchor pulling rope (10), a side anchor pulling rope (22) and a middle reinforcing anchor pulling rope (23), and one or more pressure reducing rings (9) are arranged on the upper anchor pulling rope (10);
s12: an upper supporting rope (24) and a lower supporting rope (25) are installed, and then the annular net (2) and the grating (3) are installed.
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