CN102031760A - Anti-rockfall method for subgrade in rock deposit zone - Google Patents
Anti-rockfall method for subgrade in rock deposit zone Download PDFInfo
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- CN102031760A CN102031760A CN 201010592514 CN201010592514A CN102031760A CN 102031760 A CN102031760 A CN 102031760A CN 201010592514 CN201010592514 CN 201010592514 CN 201010592514 A CN201010592514 A CN 201010592514A CN 102031760 A CN102031760 A CN 102031760A
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Abstract
The invention relates to an anti-rockfall method for a subgrade in a rock deposit zone. The method comprises the following steps that: a stone blocking wall and a stone blocking net are cooperatively used; the stone blocking wall is built by layering mortar rubbles; a cast-in-place concrete layer is arranged on the upper part of the stone blocking wall body; the cast-in-place concrete layer and the wall body are reinforced by reinforcing steel bars; the stone blocking net is formed by knitting steel wire ropes and is supported by a steel post; a concrete foundation is arranged at the bottom of the steel post and is embedded in the cast-in-place concrete layer of the stone blocking wall; the stone blocking net is connected with an anchor rod fixed on the slope surface through an upwards pulling anchor rope; and the height and width of the part, which is not deeply embedded, of the foundation of the stone blocking wall, are determined according to the related technical standard. The stone blocking wall and the stone blocking net are cooperatively used, so an effective three-dimensional anti-rockfall protection system is formed. When the jumping height of a rockfall is relatively low, the rockfall is intercepted by the stone blocking wall; and when the height of a rockfall is relatively high, the rockfall is intercepted by the stone blocking net, so that a road is prevented from being damaged. The method is suitable for the interception of the rockfall of which the energy is within 750KJ, and has a relatively wide interception range and relatively high safety.
Description
Technical field
The present invention relates to a kind of rock-fall proof method of subgrade in rock deposit zone engineering, particularly relate to the subgrade in rock deposit zone engineering rock-fall proof method that a kind of stone cut off wall and stone blocking net are used.
Background technology
Talus location geological condition complexity, the phenomenon that collapses are the recurrent phenomenons of subgrade in rock deposit zone engineering.When collapsing, the avalanche downwards from the steep slope of accumulation body or stone, roll, destructive process is rapid, very brief and fierce.Falling rocks can produce very big destruction to subgrade in rock deposit zone, blocks the traffic, even threatens the safety of pedestrians and vehicles.Therefore, it is very necessary adopting the measure of rational and effective rock-fall proof in the talus location.
Stone cut off wall is one of main passive protection technology of talus highway section subgrade construction, is laid in the suitable position before cliff or the abrupt slope pin usually, and be laid in distance before cliff or the abrupt slope pin and oneself height, the width equidimension all should be determined by calculating.
Stone blocking net is the flexible passive protection of a kind of falling rocks system that uses in recent years.Stone blocking net is with the main difference of traditional structure of blocking, the flexibility of system and intensity are enough to absorb and disperse to transmit the falling rocks impact kinetic energy of estimating, promptly, become the safeguard function that high-intensity flexible structure realizes system from changing traditional rigidity or low-intensity, low flexible structure in idea.But the rock-fall proof function that how to make full use of stone cut off wall and stone blocking net awaits to study.
Summary of the invention
The problem to be solved in the present invention is: the rock-fall proof method when providing a kind of good environmental adaptability, construction infection is little, cost is low, rock-fall proof is effective ground, talus location side slope steep.
Technical scheme of the present invention is:
A kind of rock-fall proof method of subgrade in rock deposit zone, by stone cut off wall and stone blocking net are set, described stone cut off wall vertically is provided with along route direction, and the distance of stone cut off wall and excavation roadbed side slope line is not less than 10m;
Described stone cut off wall adopts mortar flag stone to build by laying bricks or stones, soil property hillside section stone cut off wall embedded depth of foundation is not less than 100cm, stone matter hillside section stone cut off wall embedded depth of foundation is not less than 40cm, the positive gradient of the wall of stone cut off wall is 1:0.25, the wall back side of meeting falling rocks is for vertically domatic, stone cut off wall wall body is provided with the cast-in-situ concrete layer, uses steel reinforcing between cast-in-situ concrete layer and the wall body;
Described stone blocking net adopts the wire rope braiding, and is supported by steel column, and the steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall, and the steel column spacing is 10-12m, stone blocking net by on draw anchor cable and be fixed in domatic anchor pole and link to each other.
Described stone cut off wall is provided with the shrinkage joint of wide 2cm together every 10m, and clog with the pitch loose hemp fiber at the shrinkage joint, and the filling degree of depth is 15cm; The height of cast-in-situ concrete layer is no less than 40cm, and strength grade is C20.
Described stone blocking net mesh is the rhombus of length of side 150mm, and the falling rocks face of meeting of stone blocking net also is provided with one deck iron wire grid; On draw anchor cable to be provided with pressure-reducing ring; Mortar flag stone employing intensity is that the mortar of 7.5Mpa is built by laying bricks or stones.
Above height, the width of stone cut off wall embedded depth of foundation determined by calculating according to the technical standard in the current national codes.
Positive beneficial effect of the present invention:
1, the stone cut off wall of the inventive method has the certain basis buried depth, can guarantee that the wall body is stable, prevents the bump generation unstable failure of wall body because of falling rocks; Stone cut off wall has suitable wall height, falling rocks all can be tackled, and prevents falling rocks infringement roadbed; Stone cut off wall lower walls body adopts mortar flag stone, and cast-in-situ concrete is adopted on top, and with fixing reinforcing bar mortar flag stone wall body and cast-in-situ concrete reinforcing can be improved the globality of stone cut off wall like this; Stone cut off wall is provided with the shrinkage joint every a determining deviation simultaneously, has eliminated because of the influence of material swell-shrinking deformation to stone cut off wall.Overcome the not good enough drawback of stone cut off wall overall performance in the past.
2, stone blocking net of the present invention adopts flexible passive protection mode, utilizes flexible passive protection system interception falling rocks.The flexibility of flexible passive protection net mainly comes from structures such as wire rope net, supporting rope and pressure-reducing ring, the kinetic energy of the falling rocks in can safe absorption system designed output scope, the safety that has improved the whole protection architecture.Support steel column employing concrete pedestal fixedly the time, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall, guarantee being connected firmly of steel column and stone cut off wall, help the integral protection ability of stone blocking net.
3, stone blocking net of the present invention on draw anchor cable to be provided with pressure-reducing ring, can reduce the stone kinetic energy that produced of bump suddenly, play cushioning effect, can prevent the overload of stone blocking net system.When the suffered pulling force of the wire rope that is connected with pressure-reducing ring acquired a certain degree, pressure-reducing ring started and absorbs energy by deformation displacement, thereby realized overload protection.
4, the present invention is used stone cut off wall and stone blocking net, has formed effective three-dimensional rock-fall proof protection system.When the falling rocks jump height is low, tackle by stone cut off wall; When the falling rocks jump height is higher, stone blocking net will be tackled, and avoid highway to suffer damage.The present invention is applicable to interception energy 750KJ with interior falling rocks, and the interception scope is bigger, and safety is higher.
Description of drawings
Fig. 1: stone cut off wall of the present invention, stone blocking net sectional schematic diagram,
Fig. 2: stone blocking net schematic cross-section of the present invention,
Fig. 3: stone blocking net schematic top plan view of the present invention.
Among the figure, 1 is anchor pole, 2 on draw anchor cable, 3 be pressure-reducing ring, 4 be steel column, 5 is stone blocking net, 6 are the cast-in-situ concrete layer, 7 is fixing reinforcing bar, 8 is stone cut off wall, 9 is excavation roadbed side slope line, 10 is concrete pedestal, 11 is supporting rope.
The specific embodiment
Embodiment 1: referring to Fig. 1, Fig. 2, Fig. 3, and the method for subgrade in rock deposit zone engineering rock-fall proof, by stone cut off wall and stone blocking net are set, stone cut off wall vertically is provided with along route direction, and the distance L of stone cut off wall and excavation roadbed side slope line is not less than 10m;
Roadbed falling rocks guard system comprises stone cut off wall, stone blocking net from down to up, and stone cut off wall is connected by steel column with stone blocking net, stone blocking net and domatic by on draw anchor cable and anchor pole to be connected and fixed.
Stone cut off wall adopts the M7.5 mortar flag stone to build (being that intensity is the sheet stone material that the mortar of 7.5Mpa is built by laying bricks or stones) by laying bricks or stones, and the embedded depth of foundation of stone cut off wall requires (representing with H among the figure), is not less than 100cm on the soil property hillside, and section is not less than 40cm on stone matter hillside.The metope gradient is 1:0.25, and the wall back side (meeting the falling rocks face) is for vertically domatic.Wall body 40cm section adopts C20 cast-in-situ concrete, and with the fixedly reinforcing bar of φ 12 itself and mortar flag stone wall body is reinforced the connection.Stone cut off wall is provided with the wide shrinkage joint of 2cm one every 10m, and clog with the pitch loose hemp fiber at the shrinkage joint, and the filling degree of depth is 15cm.
Height, width that the stone cut off wall embedded depth of foundation is above need calculate to determine according to the technical standard in the current national codes, promptly according to the amount of force of falling rocks to stone cut off wall, calculate the height and the width of stone cut off wall.Falling rocks is big more to the active force of stone cut off wall, and the height of stone cut off wall and width also correspondingly increase.Stone blocking net adopts the wire rope braiding, and is supported by steel column, and the steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall.
Stone blocking net adopts the wire rope establishment of φ 8, and mesh is that the length of side is the diamond-shaped meshes of 150mm.The stone blocking net steel column is by support, and the steel column spacing is 10m, and two steel column tops are connected by supporting rope.The steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall, steel column upper end adopt φ 18 on draw anchor cable and be fixed in domatic anchor pole and link to each other.Anchor pole adopts φ 25 screw-thread steels to make the long 400cm of anchor pole.On draw anchor cable to be provided with pressure-reducing ring (being commonly called as Energy eliminating ring), constitute by helical annular steel pipe and fixture, mainly play buffering, reduce stone and clash into generation kinetic energy suddenly.
The stage of construction of subgrade in rock deposit zone engineering rock-fall proof protection system of the present invention is as follows:
The sequence of construction of stone cut off wall and method:
(1) substrate surface weathering, soft native stone are removed;
(2) excavation of foundation pit;
(3) the wall body is built by laying bricks or stones, and foundation ditch should be with building the back-filling in layers compacting by laying bricks or stones;
(4) upright film, the cast-in-place concrete wall body.
The sequence of construction of stone blocking net and method:
(1) removes surface dust and the float stone that influences construction safety in the slope protection zone;
(2) unwrapping wire is measured the position of determining anchor pole and concrete pedestal;
(3) pedestal excavation, by projected depth Drilling bolthole and clear hole, hole depth should be greater than more than the design rock-bolt length 10cm;
(4) slip casting and insert anchor pole, adopt label to be not less than the cement mortar of M20,, preferentially select for use particle diameter to be not more than the middle fine sand of 3mm with the Portland cement of cement-sand ratio 1:1, guarantee that slurries are full, the injecting cement paste maintenance should be no less than three days before carrying out next process;
(5) supporting rope is installed, the shop hangs wire rope net and sews up from the top down.
Embodiment 2: basic identical with embodiment 1, difference is:
The additional outward one deck iron wire grid of stone blocking net is used to tackle the fritter rubble.Except that on draw anchor cable to be provided with the pressure-reducing ring, also be provided with pressure-reducing ring on the supporting rope.
Embodiment 1: referring to Fig. 1, Fig. 2, Fig. 3, and the method for subgrade in rock deposit zone engineering rock-fall proof, by stone cut off wall and stone blocking net are set, stone cut off wall vertically is provided with along route direction, and the distance L of stone cut off wall and excavation roadbed side slope line is not less than 10m;
Roadbed falling rocks guard system comprises stone cut off wall, stone blocking net from down to up, and stone cut off wall is connected by steel column with stone blocking net, stone blocking net and domatic by on draw anchor cable and anchor pole to be connected and fixed.
Stone cut off wall adopts the M7.5 mortar flag stone to build (being that intensity is the sheet stone material that the mortar of 7.5Mpa is built by laying bricks or stones) by laying bricks or stones, and the embedded depth of foundation of stone cut off wall requires (representing with H among the figure), is not less than 100cm on the soil property hillside, and section is not less than 40cm on stone matter hillside.The metope gradient is 1:0.25, and the wall back side (meeting the falling rocks face) is for vertically domatic.Wall body 40cm section adopts C20 cast-in-situ concrete, and with the fixedly reinforcing bar of φ 12 itself and mortar flag stone wall body is reinforced the connection.Stone cut off wall is provided with the wide shrinkage joint of 2cm one every 10m, and clog with the pitch loose hemp fiber at the shrinkage joint, and the filling degree of depth is 15cm.
Height, width that the stone cut off wall embedded depth of foundation is above need calculate to determine according to the technical standard in the current national codes, promptly according to the amount of force of falling rocks to stone cut off wall, calculate the height and the width of stone cut off wall.Falling rocks is big more to the active force of stone cut off wall, and the height of stone cut off wall and width also correspondingly increase.Stone blocking net adopts the wire rope braiding, and is supported by steel column, and the steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall.
Stone blocking net adopts the wire rope establishment of φ 8, and mesh is that the length of side is the diamond-shaped meshes of 150mm.The stone blocking net steel column is by support, and the steel column spacing is 10m, and two steel column tops are connected by supporting rope.The steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall, steel column upper end adopt φ 18 on draw anchor cable and be fixed in domatic anchor pole and link to each other.Anchor pole adopts φ 25 screw-thread steels to make the long 400cm of anchor pole.On draw anchor cable to be provided with pressure-reducing ring (being commonly called as Energy eliminating ring), constitute by helical annular steel pipe and fixture, mainly play buffering, reduce stone and clash into generation kinetic energy suddenly.
The stage of construction of subgrade in rock deposit zone engineering rock-fall proof protection system of the present invention is as follows:
The sequence of construction of stone cut off wall and method:
(1) substrate surface weathering, soft native stone are removed;
(2) excavation of foundation pit;
(3) the wall body is built by laying bricks or stones, and foundation ditch should be with building the back-filling in layers compacting by laying bricks or stones;
(4) upright film, the cast-in-place concrete wall body.
The sequence of construction of stone blocking net and method:
(1) removes surface dust and the float stone that influences construction safety in the slope protection zone;
(2) unwrapping wire is measured the position of determining anchor pole and concrete pedestal;
(3) pedestal excavation, by projected depth Drilling bolthole and clear hole, hole depth should be greater than more than the design rock-bolt length 10cm;
(4) slip casting and insert anchor pole, adopt label to be not less than the cement mortar of M20,, preferentially select for use particle diameter to be not more than the middle fine sand of 3mm with the Portland cement of cement-sand ratio 1:1, guarantee that slurries are full, the injecting cement paste maintenance should be no less than three days before carrying out next process;
(5) supporting rope is installed, the shop hangs wire rope net and sews up from the top down.
Embodiment 2: basic identical with embodiment 1, difference is:
The additional outward one deck iron wire grid of stone blocking net is used to tackle the fritter rubble.Except that on draw anchor cable to be provided with the pressure-reducing ring, also be provided with pressure-reducing ring on the supporting rope.
Claims (7)
1. the rock-fall proof method of a subgrade in rock deposit zone, it is characterized in that: this method is by being provided with stone cut off wall and stone blocking net, and described stone cut off wall vertically is provided with along route direction, and the distance of stone cut off wall and excavation roadbed side slope line is not less than 10m; Described stone cut off wall adopts mortar flag stone to build by laying bricks or stones, soil property hillside section stone cut off wall embedded depth of foundation is not less than 100cm, stone matter hillside section stone cut off wall embedded depth of foundation is not less than 40cm, the positive gradient of the wall of stone cut off wall is 1:0.25, the wall back side of meeting falling rocks is for vertically domatic, stone cut off wall wall body is provided with the cast-in-situ concrete layer, uses steel reinforcing between cast-in-situ concrete layer and the wall body; Described stone blocking net adopts the wire rope braiding, and is supported by steel column, and the steel column root is provided with concrete pedestal, and concrete pedestal is embedded in the cast-in-situ concrete layer of stone cut off wall, and the steel column spacing is 10-12m, stone blocking net by on draw anchor cable and be fixed in domatic anchor pole and link to each other.
2. rock-fall proof method according to claim 1 is characterized in that: described stone cut off wall is provided with the shrinkage joint of wide 2cm together every 10m, and clog with the pitch loose hemp fiber at the shrinkage joint, and the filling degree of depth is 15cm.
3. rock-fall proof method according to claim 1 is characterized in that: the height of described cast-in-situ concrete layer is no less than 40cm, and strength grade is C20.
4. rock-fall proof method according to claim 1 is characterized in that: described stone blocking net mesh is the rhombus of length of side 150mm, and the falling rocks face of meeting of stone blocking net also is provided with one deck iron wire grid.
5. rock-fall proof method according to claim 1 is characterized in that: draw anchor cable to be provided with pressure-reducing ring on described.
6. rock-fall proof method according to claim 1 is characterized in that: the mortar that described mortar flag stone employing intensity is 7.5Mpa is built by laying bricks or stones.
7. according to each described rock-fall proof method of claim 1-6, it is characterized in that: above height, the width of described stone cut off wall embedded depth of foundation determined by calculating according to the technical standard in the current national codes.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102261078A (en) * | 2011-05-10 | 2011-11-30 | 湖南省交通规划勘察设计院 | Steel wire rope net as well as active protecting net and rockfall protecting fence containing steel wire rope net |
| CN102787563A (en) * | 2012-09-02 | 2012-11-21 | 中铁二院工程集团有限责任公司 | Dangerous-rock and rockfall preventing structure of high-steep side slope bridge connected section |
| CN103510476A (en) * | 2013-08-05 | 2014-01-15 | 四川川交路桥有限责任公司 | Protective shed preventing falling flying stone and construction method of protective shed |
| CN103741610A (en) * | 2014-01-03 | 2014-04-23 | 东南大学 | Rigid rolling stone collision-prevention device for bridge pier |
| CN104294832A (en) * | 2014-10-22 | 2015-01-21 | 贵州正业工程技术投资有限公司 | Talus unloading reinforcement structure for karst depression |
| CN104294833A (en) * | 2014-10-22 | 2015-01-21 | 贵州正业工程技术投资有限公司 | Integral reinforcement structure for talus |
| CN104674686A (en) * | 2015-02-15 | 2015-06-03 | 三峡大学 | Side slope rockfall cushioning and protection system |
| CN105113436A (en) * | 2015-09-15 | 2015-12-02 | 浙江科技学院 | Net belt self-pretightening type safety anchorage device for dangerous rock protection |
| CN106194213A (en) * | 2016-08-29 | 2016-12-07 | 长江勘测规划设计研究有限责任公司 | A kind of shed hole structure crossing over debris flow gully and construction method |
| CN106498903A (en) * | 2016-12-15 | 2017-03-15 | 中国电建集团成都勘测设计研究院有限公司 | Water power slope retaining structure |
| CN107675715A (en) * | 2017-09-29 | 2018-02-09 | 中国十七冶集团有限公司 | A kind of high-steep slope protection structure and its construction method |
| CN109356046A (en) * | 2018-10-31 | 2019-02-19 | 四川路航建设工程有限责任公司 | Grid steel construction keeps off stone walling and construction method |
| CN110306450A (en) * | 2019-06-20 | 2019-10-08 | 中铁二院工程集团有限责任公司 | A kind of light-duty falling rocks interception construction of high gradient slope |
| CN114134833A (en) * | 2021-12-03 | 2022-03-04 | 广州市设计院集团有限公司 | Stone blocking net foundation device, stone blocking net system and construction method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261078A (en) * | 2011-05-10 | 2011-11-30 | 湖南省交通规划勘察设计院 | Steel wire rope net as well as active protecting net and rockfall protecting fence containing steel wire rope net |
| CN102787563A (en) * | 2012-09-02 | 2012-11-21 | 中铁二院工程集团有限责任公司 | Dangerous-rock and rockfall preventing structure of high-steep side slope bridge connected section |
| CN103510476A (en) * | 2013-08-05 | 2014-01-15 | 四川川交路桥有限责任公司 | Protective shed preventing falling flying stone and construction method of protective shed |
| CN103741610B (en) * | 2014-01-03 | 2016-02-10 | 东南大学 | The anti-Rolling Stone crash device of a kind of bridge pier rigidity |
| CN103741610A (en) * | 2014-01-03 | 2014-04-23 | 东南大学 | Rigid rolling stone collision-prevention device for bridge pier |
| CN104294832A (en) * | 2014-10-22 | 2015-01-21 | 贵州正业工程技术投资有限公司 | Talus unloading reinforcement structure for karst depression |
| CN104294833A (en) * | 2014-10-22 | 2015-01-21 | 贵州正业工程技术投资有限公司 | Integral reinforcement structure for talus |
| CN104674686A (en) * | 2015-02-15 | 2015-06-03 | 三峡大学 | Side slope rockfall cushioning and protection system |
| CN104674686B (en) * | 2015-02-15 | 2016-07-13 | 三峡大学 | A kind of Falling Rocks buffer protection system |
| CN105113436A (en) * | 2015-09-15 | 2015-12-02 | 浙江科技学院 | Net belt self-pretightening type safety anchorage device for dangerous rock protection |
| CN106194213A (en) * | 2016-08-29 | 2016-12-07 | 长江勘测规划设计研究有限责任公司 | A kind of shed hole structure crossing over debris flow gully and construction method |
| CN106498903A (en) * | 2016-12-15 | 2017-03-15 | 中国电建集团成都勘测设计研究院有限公司 | Water power slope retaining structure |
| CN107675715A (en) * | 2017-09-29 | 2018-02-09 | 中国十七冶集团有限公司 | A kind of high-steep slope protection structure and its construction method |
| CN109356046A (en) * | 2018-10-31 | 2019-02-19 | 四川路航建设工程有限责任公司 | Grid steel construction keeps off stone walling and construction method |
| CN109356046B (en) * | 2018-10-31 | 2024-03-26 | 四川路航建设工程有限责任公司 | Grille steel structure stone blocking wall and construction method |
| CN110306450A (en) * | 2019-06-20 | 2019-10-08 | 中铁二院工程集团有限责任公司 | A kind of light-duty falling rocks interception construction of high gradient slope |
| CN114134833A (en) * | 2021-12-03 | 2022-03-04 | 广州市设计院集团有限公司 | Stone blocking net foundation device, stone blocking net system and construction method |
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Application publication date: 20110427 |