CN209975544U - Active net protection back slope system next to existing railway high slope - Google Patents
Active net protection back slope system next to existing railway high slope Download PDFInfo
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- CN209975544U CN209975544U CN201920636652.2U CN201920636652U CN209975544U CN 209975544 U CN209975544 U CN 209975544U CN 201920636652 U CN201920636652 U CN 201920636652U CN 209975544 U CN209975544 U CN 209975544U
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Abstract
The utility model relates to a close to the active net protection system against the slope of the existing railway high side slope, which is suitable for the safety protection construction engineering which prevents the slope rock from falling down by the non-blasting excavation of the side slope of the traffic roads such as close to business railways and the like and forms the safety threat by other infrastructures such as close to buildings and the like; the slope protection system structure comprises an SNS active protection system and a passive protection system, a groove is dug at the bottom of a slope, the passive protection system is erected in the groove, the SNS active protection system mainly comprises an SNS flexible net, a transverse supporting rope, a longitudinal supporting rope, a sewing rope and a prestressed anchor rod, and the passive protection system mainly comprises an SNS flexible net tower foundation, a vertical rod and a guard plate; the SNS flexible protection technology protects the slope, avoids increasing the slope load of a high slope, is beneficial to the stability of the slope, reduces the influence of the excavated rockfall on traffic roads such as railways and highways as much as possible during construction, and ensures normal and safe traffic.
Description
Technical Field
The utility model relates to a construction safety construction technical field, concretely relates to existing railway high side slope initiative net protection adverse slope system of next-door neighbour is applicable to next-door neighbour's business operation railway high side slope non-blasting excavation and prevents that domatic rock mass from caving in, reaches other infrastructure such as next-door neighbour's building and constructs and constitute the safety protection construction engineering of security threat.
Background
With the continuous promotion of infrastructure construction in China, the construction of high slopes next to existing buildings and structures is more and more, and the protection difficulty and the security threat are more and more. Particularly, the slope of the excavation high side slope is steep, the height difference of the slope top and the slope foot is large, and collapse and rock fall disasters often occur on the side slope in the excavation disturbance process, so that great safety threats are brought to normal operation of the adjacent traffic lines.
Particularly in mountainous cities in Chongqing, for example, a project in a certain place in Chongqing is proposed, a proposed site is located in a hilly area of a Yangtze river west bank, the east side of a stone excavation area of a project place level is close to an existing Yu railway line, the height difference between a high side slope and the railway line is about 30 meters, the existing slope is locally uneven, protective measures are not taken, rock masses are weathered, dangerous stones are more, a conventional direct excavation mode is adopted, the safety of the existing railway is greatly threatened, and even if mechanical non-blasting excavation is comprehensively adopted, the safety is difficult to guarantee.
Disclosure of Invention
In view of the problem that exists among the prior art, the utility model provides a next-door neighbour's existing railway high slope initiative net protection adverse slope system, SNS flexible protection technology protects domatic, avoids increasing the domatic load of high slope, is favorable to domatic stability, and the influence of minimize excavation rockfall to traffic roads such as railway, highway during the construction ensures normal safety of traffic.
In order to realize the technical purpose, the utility model discloses a technical scheme as follows:
the active network protection system is close to the existing railway high slope and comprises an SNS active protection system and a passive protection system, wherein the SNS active protection system mainly comprises an SNS flexible network, transverse support ropes, longitudinal support ropes, suture ropes and prestressed anchor rods, anchor rod orifices are arranged and excavated on the slope in the longitudinal and transverse directions, the prestressed anchor rods are fixed in the anchor rod orifices, the transverse support ropes and the longitudinal support ropes are tied on the prestressed anchor rods, the SNS flexible network is connected to the transverse support ropes and the longitudinal support ropes by the suture ropes and clings to the slope surface of the slope; a groove is dug at the bottom of the side slope, a passive protection system is erected in the groove and mainly comprises an SNS flexible net tower foundation, upright posts and guard plates, a plurality of upright post spacing holes are transversely arranged in the groove, the upright posts are inserted into the upright post spacing holes for fixation, and the guard plates are transversely erected between two adjacent upright posts; and the SNS flexible net tower foundation is fixed on the side of the baffle guard plate and is higher than the baffle guard plate and the upright rod.
Compared with the prior art, the design has the beneficial effects that: due to the fact that the SNS active protection system is adopted, flexible protection is conducted on the slope surface of the side slope, safety is high, the increase of the slope load of the side slope can be avoided, the damage to the original shape of the boundary skin is avoided, the stability of the slope surface is improved, and the construction environment is safer. Due to the fact that the passive protection system is adopted and combined with the SNS active protection system to form the three-dimensional protection system for the side slope of the traffic road, unstable rocks generated by side slope excavation can be controlled in multiple modes, and safety risks can be effectively controlled.
An excavation method of an active net protection back slope system adjacent to an existing railway high slope comprises the following steps:
(1) surveying a construction site, preliminarily measuring the area of a side slope close to a traffic road, knowing the condition of side slope rocks, marking dangerous rocks, boulders and the like, and determining the type of the SNS active protection system according to the condition of the side slope actually examined and wiped, the importance of the surrounding environment and a protective object;
(2) installing SNS active protection system
① the safety rope anchor rods are arranged at the upper part of the side slope or the middle upper part of the side slope, the safety ropes are bound on the safety rope anchor rods,
② anchoring the anchor rod with cement slurry for at least 48 hr;
③ constructors clean surrounding rocks on a side slope body by using safety ropes, the traffic needs to be sealed before cleaning, the lower constructors need to withdraw to a safety zone, if local large dangerous rocks are cleaned and cannot be cleaned, the constructors need to mark, and in later construction, a drilling process is avoided;
④ drilling an anchor rod orifice, paying off a side slope to determine an anchor rod hole position, brushing oil to determine a drilling point, drilling by using a hanging basket or a double-row scaffold according to the slope of the side slope, wherein the drill bit with the diameter phi of 45 is adopted for drilling the anchor rod orifice, the hole depth is longer than the length of the prestressed anchor rod by more than 5cm, drill rods with the diameter phi of 1.0m, 2m and 2.5 are respectively adopted for construction, and settled slag and water body viscosity on the hole wall are cleaned after the drilling is finished;
⑤ pouring prestressed anchor, putting the prestressed anchor into the anchor hole, the top of the exposed lantern ring can not be higher than the slope surface, pouring the prepared mortar into the anchor hole, pouring tightly, pouring while tamping, discharging the air in the anchor hole, condensing the mortar for at least 48 hours after pouring, and finally hanging the steel wire rope lantern ring on the hook at the tail of the anchor;
⑥ installing transverse supporting ropes and longitudinal supporting ropes, accurately measuring the spacing between the prestressed anchor rods at the two ends of each supporting rope before the longitudinal and transverse supporting ropes are installed, wherein the lengths of the longitudinal and transverse supporting ropes are increased by 1m on the basis of the measured lengths, then the longitudinal and transverse supporting ropes sequentially pass through the exposed lantern rings at the upper ends of the prestressed anchor rods, after the longitudinal and transverse supporting ropes reach the last end of the prestressed anchor rods, the tail of the rope passes through the last prestressed anchor rod and is bent, the rope is tensioned by a rope tightener or a hoist with the tensioning force not less than 5KN, and finally the tail end is fixed by a rope clamp;
⑦ hanging net and sewing, wherein the SNS flexible net is tightly attached to the slope surface of the side slope for installation, the longitudinal and transverse support ropes are arranged below the SNS flexible net, the SNS flexible net and the longitudinal and transverse support ropes are connected by sewing with sewing ropes, the two ends of the sewing ropes are overlapped by a length not less than 0.5m, the ends of the sewing ropes are respectively connected with the SNS flexible net by two rope clamps, in the connection process, after one end is fixed, the sewing ropes are tensioned by a rope tensioner gourd with a tensioning force not less than 5KN, and then the other end is fixed;
(3) passive protection system construction of side slope sloping field
Before construction, impurities on the surface of the slope bottom of the side slope are cleared and leveled, then a row of shallow trenches are excavated, a row of vertical rod spacing holes are drilled, vertical rods are inserted into the vertical rod spacing holes for fixation, and finally a guard plate is transversely installed between the vertical rods, wherein the height of the guard plate is at least 2 m;
(4) the method comprises the steps that a first-layer reverse slope excavation and SNS active protection system of the side slope is disassembled and locked in a layered mode, before the side slope excavation, the layered excavation height is divided, reverse slope soil retaining ridges are reserved, and the side slope is excavated step by step sequentially from top to bottom;
when the first layer is excavated, firstly, excavating the inner side of a side slope, wherein the general height of each layer of excavation is 3m, reserving a reverse slope soil retaining bank on the outer side of the side slope, and the width of the soil retaining bank is not suitable to be less than 3 m; then excavating a reverse slope soil retaining ridge, keeping the height of the reverse slope soil retaining ridge not lower than 1.5m, and hooking and excavating from outside to inside when excavating the reverse slope soil retaining peduncle so that soil and stones in excavation roll towards the outer side of the reverse slope; when the soil blocking ridge is excavated, removing the SNS flexible network matched with the excavated layer, when the SNS flexible network is removed, loosening the end clamps, pulling the longitudinal and transverse supporting ropes by using the manual fenugreek, gradually loosening the longitudinal and transverse supporting ropes, removing the SNS flexible network of the layer when the longitudinal and transverse supporting ropes are in a natural hanging state, excavating the soil blocking ridge, and repeating the construction for each layer until the excavation is finished;
when the slope is excavated in a reverse slope, after part of SNS flexible networks, namely the longitudinal and transverse support ropes, are removed, the longitudinal and transverse support ropes of the opening part at the upper part of the outer side of the rest side slope are properly tightened, and rocks of the soil ridge which accidentally fall in the excavation process can enter the locking SNS active protection system to be trapped;
(5) and after the slope excavation is finished, cleaning all SNS active protection systems out of the field, and finally dismantling the passive protection systems.
And further limiting, the height of the SNS flexible net tower base is higher than that of the vertical rod and the baffle plate, and a cushion pad is arranged on one side, facing the slope side, of the SNS flexible net tower base.
The excavation method of the active network protection reverse slope system close to the existing railway high slope is characterized in that a slope protection system structure is combined, excavation is carried out from the reverse slope surface of the slope, a protective belt is formed at the top of the slope, blasting is not needed, dangerous rock removal is carried out by adopting mechanical equipment to carry out hooking and removing cleaning in the direction opposite to the slope excavation protection facility, rocks are reduced to enter the SNS flexible network, the safety mode of the excavation mode is realized, and construction safety is better guaranteed. In addition, the SNS active protection network system wraps the whole rock surface through the anchor rods and the SNS flexible grids, compared with the traditional rigid protection measures, the construction work amount is small, the modularized installation can be realized, and the construction process is simple; the passive protective net adopts a mode of combining the vertical rod with the automobile tire, is safe and reliable, and reduces the cost.
Further inject, the flexible net column foot of SNS is H shaped steel board, and H shaped steel board stands in the fender board outside that deviates from side slope one side to two pole settings adjacent with H shaped steel board are higher than other pole settings and fender boards of ditch inslot setting, and wherein, the blotter adopts junked tire to hang in one side that H shaped steel board is close to fender board.
Further limiting, a pull rod fixed at the bottom of the side slope is further arranged on the H-shaped steel plate, and collapse of the high SNS flexible net tower foundation is prevented.
Further defined, the anchor hole is an anchor pit, and the upper plane of the anchor hole is lower than the upper surface of the side slope.
Further limit, still be equipped with the buffer groove at the side slope bottom of a slope. In order to reduce the impact force of the passive protection system, the buffer groove is arranged to reduce the impact energy of rocks accidentally rolled.
Further defined, the cement slurry is M30, with a 1: 1-1.2 of cement mortar with water-cement ratio of 0.45-O.50 or pure cement slurry with water-cement ratio of 0.45-O.50, 425 common portland cement for cement, and medium-fine sand with grain size not more than 3 mm.
Further limiting, the diameter of the anchor pit is 20cm, the depth of the anchor pit is 15cm, and the anchor pit can be firmly attached to the slope surface of the side slope as far as possible when the SNS flexible net is laid.
Drawings
FIG. 1 is a front view of the pre-stressed anchor and the anchor hole of the present invention;
FIG. 2 is a schematic diagram of a main view of the SNS active defense system according to the present invention;
FIG. 3 is a schematic structural view of a side slope protection system and a layered reverse slope excavation construction process according to the present invention;
FIG. 4 is a schematic front view of the passive protection system of the present invention;
FIG. 5 is a schematic structural view of the slope protection system and the first layer of reverse slope excavation construction process of the present invention;
FIG. 6 is a schematic structural view of the side slope protection system and the construction process of the first layer of reverse slope earth retaining bank;
FIG. 7 is a schematic structural view of the side slope protection system and the second layer reverse slope excavation construction process of the present invention;
fig. 8 is a schematic structural view of the side slope protection system and the construction process of the second-layer reverse slope earth blocking ridge.
Detailed Description
In order that those skilled in the art can better understand the technical solution of the present invention, the following embodiments are further described with reference to the accompanying drawings and examples.
The active net protection back slope system close to the existing railway high slope as shown in fig. 1-4, the slope protection system structure comprises an SNS active protection system and a passive protection system, the SNS active protection system mainly comprises an SNS flexible net 2, a transverse support rope 3, a longitudinal support rope 4, a suture rope 5 and a prestressed anchor rod 6, anchor rod orifices 7 are arranged and excavated on the slope 1 in the longitudinal and transverse directions, the anchor rod orifices 7 are anchor rod pits, the caliber of each anchor rod pit is 20cm and the depth of each anchor rod pit is 15cm, the upper plane of each anchor rod orifice 7 is lower than the upper surface of the slope 1, and the prestressed anchor rod 6 can be arranged at a natural low-concave position in the system arrangement flexibility. The prestressed anchor rod 6 is fixed in the anchor rod orifice 7, the transverse supporting rope 3 and the longitudinal supporting rope 4 are tied on the prestressed anchor rod 6, the SNS flexible net 2 is connected to the transverse supporting rope 3 and the longitudinal supporting rope 4 through the sewing rope 5, and the SNS flexible net 2 is tightly attached to the slope surface of the side slope 1. The SNS flexible net 2 is preferably made of GAR1, GAR2, GPS1, GPS2 and the like in main models, and the longitudinal and transverse supporting ropes are steel wire rope nets or wire grids.
Digging a groove at the bottom of a side slope 1, erecting a passive protection system in the groove, wherein the passive protection system mainly comprises an SNS flexible net tower foundation 8, upright posts 9 and guard plates 10, a plurality of upright post spacing holes are transversely arranged in the groove, the upright posts 9 are inserted into the upright post spacing holes for fixation, the guard plates 10 are transversely erected between two adjacent upright posts 9, the upright posts 9 can adopt 43kg steel rails, the length of the steel rails is 3m, the steel rails are embedded into the grooves for 1m and exposed for 2m, the guard plates 10 can directly utilize railway sleepers, the cost is saved, the height of the sleepers is 2m, the length of each sleeper is 2.5m, the joint position of the sleeper is provided with 2 steel rails, and the edge of each steel rail is 30cm away from the end of; and (5) excavating a line side close to the side slope, and arranging a phi 20 steel bar anchor rod at each steel rail. The SNS flexible net tower foundation 8 is fixed on the side of the baffle plate 10 and is higher than the baffle plate 10 and the vertical rod 9, and a buffer pad 81 is installed on one side, facing the side slope 1, of the SNS flexible net tower foundation 8. The SNS flexible net tower footing 8 is an H-shaped steel plate, the H-shaped steel plate is arranged on the outer side of a blocking protection plate 10 deviating from one side of the side slope 1, a pull rod 11 fixed to the bottom of the side slope 1 is further arranged on the H-shaped steel plate, two vertical rods 9 adjacent to the H-shaped steel plate and the blocking protection plate 10 are higher than other vertical rods 9 and the blocking protection plate 10 arranged in the groove, and the cushion pads 81 are hung on one side, close to the blocking protection plate 10, of the H-shaped steel plate through waste tires.
As shown in fig. 5-8, the excavation method of the active net protection back slope system next to the existing railway high slope comprises the following steps:
(1) surveying a construction site, preliminarily measuring the area of a side slope 1 adjacent to a traffic road 12, knowing the rock condition of the side slope 1, marking dangerous rocks, boulders and the like, and determining the type of the SNS active protection system according to the actual side slope condition of examination and rubbing, the surrounding environment and the importance of protections; for the construction of the close proximity business railway, the safety risk is larger, a GPS2 protection net structure with stronger protection function is preferably selected, and the specific type selection structure list is as follows:
| model number | Net type | Support rope | Sewing rope | Main protective function | Application scope | |
| GAP1 (plain brief) Single type) | Steel wire rope net | Phi 16 edge (or upper edge) wire rope anchor rod + phi
16 slope (or upper edge) | Phi | 8 steel wire rope | Enclosure, restriction of movement range of falling rocks, and partial inhibition of collapse Collapse occurs. | The gradient is not steeper than 1: 1, slope rock mass Complete, without covering soil |
| GAR2 (Normal type) | Steel wire rope net | Phi 16 system steel wire rope anchor rod + phi 16 transverse support
Stay rope+ 16 (12) longitudinal | Phi | 8 steel wire rope | Strengthening slope surface, inhibiting collapse and weathering desquamation And limiting the local or small rockfall motion range. | The gradient is not steeper than 1: 0.75, side slope rock The body is complete and a small amount of covering soil is used |
| GPS1 (common general) Use type) | Steel wire rope net Steel wire grating | Phi 16 edge (or upper edge) wire rope anchor rod + phi
16 slope (or upper edge) | Phi | 8 steel wire rope | The falling rock movement range is limited, and the occurrence of collapse is partially inhibited. And when small falling rocks exist, selecting the falling rocks. | The gradient is not steeper than 1: 0.5, side slope rock Poor integrity of the body, and a small amount of covering soil |
| GPS2 (common general) Use type) | Steel wire rope net Steel wire grating | Phi 16 system steel wire rope anchor rod + phi 16 transverse support
Stay rope + phi 16 (12) longitudinal | Phi | 8 steel wire rope | Strengthening slope surface, inhibiting collapse and weathering desquamation The stone falling range of local or small quantity is limited by the raw stone and the small stone And selecting for falling rocks or climbing slopes. | The rock mass of the side slope is broken and has small blocks Selecting for use on stone or soil side slopes |
(2) Installing SNS active protection system
① in order to fully ensure the safety of constructors and equipment, the upper part of the side slope 1 or the middle upper part of the side slope 1 is provided with a safety rope anchor rod (adopting 28 steel bar anchor rods, the hole depth is 1.5 m), the spacing distance is 5m, the safety rope is bound on the safety rope anchor rod, the constructors can use the safety rope to carry out high-altitude cleaning operation, and the convenience is provided for the subsequent drilling installation;
② anchoring the anchor rod with M30 cement slurry for at least 48 hr, selecting cement slurry with grade no less than M30, cement mortar with sand-lime ratio of 1: 1-1.2 and water-lime ratio of 0.45-O.50 or pure cement slurry with water-lime ratio of 0.45-O.50, using 425 common silicate cement as cement, preferably selecting medium fine sand with grain size no more than 3 mm;
③ after finishing the above procedures, carrying out a dangerous rock cleaning procedure, cleaning surrounding rocks on the slope 1 by constructors by using safety ropes, sealing traffic before cleaning, withdrawing the constructors to a safety zone, marking if the constructors cannot clean local large dangerous rocks during cleaning, and avoiding the drilling procedure in later construction to prevent the dangerous rocks from loosening and sliding down due to engineering disturbance in later construction;
④ drilling an anchor hole 7, paying off the side slope 1 to determine the position of the anchor hole, generally having a longitudinal and transverse distance of 4.5m (the distance between the holes can have an adjustment amount of 0.3m according to the terrain condition), painting to determine the drilling point, selecting the anchor hole 7 at the valley as far as possible within the range of the adjustment amount allowed by the hole distance, and attaching the anchor hole 7 to the slope as close as possible at the non-valley or the anchor hole 7 which can not meet the requirement of the system installation (generally the continuous suspension area is not more than 5 m)2Otherwise, a local anchor rod with the length of not less than 2.5m is preferably added, the anchor rod can adopt a steel bar anchor rod with a hook and the diameter of not less than phi 16 or a double-strand steel rope anchor rod with the diameter of not less than 2 multiplied phi 16), then, according to the gradient of the side slope 1, a hanging basket or a double-row scaffold is used for drilling, a drill bit with the diameter phi 45 is adopted for a drill rod hole opening 7, the hole depth is more than 5cm longer than the length of the prestressed anchor rod, 1.0m, 2m and 2.5 drill rods are respectively adopted for construction, settled slag and water body adhesion on the hole wall are cleaned after the drilling is finished, the phenomena of drill sticking and rod breakage cannot be strictly prevented by the 2.5m drill rod directly, if the drilling position is in a loose rock stratum, the drilling position must be determined again through approval of relevant departments, the random construction cannot be carried out, the drilling depth of the outer edge of the slope body is. When the anchor rod is limited by rock drilling equipment, two steel ropes forming each anchor rod can be respectively anchored into two anchor holes with the aperture not smaller than phi 35 to form a herringbone anchor rod, and the included angle between the two steel ropes is 15-30 degrees so as to achieve the same anchoring effect;
after the drill anchor rod orifice 7 reaches the designed depth, the drill cannot be stopped immediately, the drill is required to be stably drilled for 1-2 minutes, and the situation that the hole bottom is sharp and extinguished and the designed hole diameter cannot be reached is prevented. The wall of the hole is drilled without sediment and water body adhesion, and the hole is cleaned, after the drilling is finished, high-pressure air (wind pressure of 0.2-0.4 MPa) is used for removing rock powder and water body in the hole out of the hole, so that the bonding strength of cement mortar and a hole wall rock-soil body is prevented from being reduced, and high-pressure water washing is not required except for relatively hard and complete rock body anchoring;
⑤ pouring prestressed anchor 6, placing prestressed anchor 6 into anchor hole 7, the top of the exposed lantern ring of prestressed anchor 6 can not be higher than the surface of slope 1, then pouring prepared mortar into anchor hole 7, pouring closely, pouring while tamping, discharging air in anchor hole 7, condensing for more than 48 hours after mortar pouring, waiting for solidification time not meeting the requirement, strictly forbidding the next procedure, ensuring prestressed anchor 6 not to be acted by external force, and finally hanging steel wire rope lantern ring on the hook at the tail of prestressed anchor 6;
⑥ installing transverse supporting ropes 3 and longitudinal supporting ropes 4, before the longitudinal and transverse supporting ropes are installed, accurately measuring the distance between the prestressed anchor rods 6 at the two ends of each supporting rope, the length of the longitudinal and transverse supporting ropes should be increased by 1m on the basis of the measured length, namely 2m in total, then the longitudinal and transverse supporting ropes sequentially pass through the exposed lantern ring at the upper end of the prestressed anchor rods 6, fixing one end by adopting rope clamps with the diameter corresponding to the supporting rope, the distance between the rope clamps is 5-l 0mm, leaving free tail ropes with the length not less than 20cm at the fixed rope ends, the number of the rope clamps is selected according to the supporting length (2 when the length of the supporting rope is less than 10m, 4 when the length of the supporting rope is more than 30m, and 3 in between the rope clamps), from the prestressed anchor rod 6 at one end, the supporting ropes sequentially pass through the lantern ring of the anchor rods 6 until the last prestressed anchor rod 6 of the row, after the longitudinal and transverse supporting ropes reach the last end of the prestressed anchor rod 6, the rope tail end of the prestressed anchor rod passes through the exposed anchor rod 6 and is bent, the prestressed anchor rod is not less than 5, the prestressed anchor rod, the tensioning rope is not less than the ground, the initial tension rope, the ground is the same as the ground, and the ground, the ground is tensioned by adopting the friction mode of;
the length of the transverse supporting ropes 3 is not more than 50m, the length of the longitudinal supporting ropes 4 is not more than 10m, and when the transverse supporting ropes exceed the length, fixing end heads are additionally arranged;
⑦, hanging nets and sewing, wherein the SNS flexible net 2 is tightly attached to the slope surface of the side slope 1 for installation, longitudinal and transverse support ropes are arranged below the SNS flexible net 2 and are laid and hung along the support ropes, two SNS flexible nets 2 are laid in every two lattices (namely, up and down or left and right), the lapping width between the SNS flexible net 2 net blocks is not less than 10cm, the SNS flexible net 2 (steel wire grating) net blocks are bound by iron wires with the diameter of not less than 1.2mm, the SNS flexible net 2 (steel wire grating net) and the support ropes are bound by binding wires with the diameter of 2.2mm, the distance between binding points is not more than 1m, and the SNS flexible net 2 (steel wire grating net) at the laying boundary is reversely folded with the width of not less than 20 cm;
the SNS flexible net 2 and the longitudinal and transverse supporting ropes are connected through sewing by using a sewing rope 5, two ends of the sewing rope 5 are overlapped by a length not less than 0.5m, the ends of the sewing rope 5 are respectively connected with the SNS flexible net 2 by using two rope clamps, in the connection process, after one end is fixed, the sewing rope is tensioned by using a rope tensioner gourd with tensioning force not less than 5KN, and then the other end is fixed; if the error of the determined single sewing rope 5 is larger, the redundant end can extend to the adjacent net hanging unit, and the insufficient length is supplemented by the sewing rope of the next adjacent net hanging unit.
(3) Passive protection system construction of side slope sloping field
Before construction, impurities on the surface of the slope bottom of the side slope 1 are cleared and leveled, then a row of shallow trenches are excavated, a row of holes with intervals among the upright posts 9 are drilled, the upright posts 9 are inserted into the holes with intervals among the upright posts for fixation, and finally the guard plates 10 are transversely arranged among the upright posts 9, wherein the height of the guard plates 10 is at least 2 m;
in order to reduce the impact force of the passive protection system, a buffer groove is also arranged at the bottom of the side slope 1. The toe buffer groove can be set according to specific conditions, and can be set to be about 1m wide and 0.8m deep under the condition that the conditions allow. When conditions are limited, a reverse slope inclined by more than 30 degrees to the side slope 1 side can be filled at the slope toe.
(4) The first-layer reverse slope excavation and SNS active protection system of the side slope 1 is detached and locked in a layered mode, before the side slope excavation, firstly, the excavation height of the layer 1-1 is divided, a reverse slope 1-2 and a reverse slope soil retaining ridge 1-3 are reserved, and the side slope is excavated step by step sequentially from top to bottom;
when the first layer is excavated in a layered mode 1-1, firstly, excavating the inner side of a side slope, wherein the general height of each layer of excavation is 3m, reserving a reverse slope soil retaining ridge 1-3 at the outer side of the side slope, and the width of the soil retaining ridge 1-3 is not suitable to be smaller than 3 m; then excavating a reverse slope soil retaining ridge 1-3, keeping the height of the reverse slope soil retaining ridge 1-3 not lower than 1.5m, and hooking and excavating from outside to inside when excavating the reverse slope soil retaining ridge 1-3 so that soil and stones during excavation roll towards the outside of the reverse slope 1-2; when the soil blocking ridge is excavated, removing the SNS flexible network 2 matched with the excavated layer, when the SNS flexible network 2 is removed, loosening the end clamps, pulling the longitudinal and transverse supporting ropes by using the manual fenugreek, gradually loosening the longitudinal and transverse supporting ropes, removing the SNS flexible network 2 of the layer when the longitudinal and transverse supporting ropes are in a natural hanging state, excavating the soil blocking ridge 1-3, and repeating the construction for each layer of excavated soil blocking ridge until the excavation is finished;
when the machine digs soil, the soil should be dug layer by layer from top to bottom, rock stealing or soil digging under boulders is strictly forbidden, and sufficient illumination should be provided at night. When the side slope is operated, the change condition of the side slope 1 is noticed at any time, if a large-area image crack phenomenon is found, the construction must be suspended, meanwhile, the construction is connected with a railway department, and the traffic is carried out after danger is eliminated;
when a reverse slope 1-2 is excavated, after part of the SNS flexible network 3 and the longitudinal and transverse support ropes are removed, the longitudinal and transverse support ropes of the opening part at the upper part of the outer side of the rest side slope 1 are properly tightened, and rocks of the soil bank which accidentally fall in the excavation process can enter the locking SNS active protection system to be trapped;
when the side slope 1 works, a safety helmet must be worn to strictly prevent soil blocks and other objects from falling down to injure the head, when underground water seeps out, water should be led to a water collecting well to be discharged, and safety belts must be tied for side slope net hanging and net detaching construction.
(5) And after the excavation of the side slope 1 is finished, cleaning all SNS active protection systems out of the field, and finally dismantling the passive protection systems.
The process principle of the method is as follows: the SNS active protection system and the SNS passive protection system are combined with a non-blasting reverse slope excavation mode to form a comprehensive protection system, and the comprehensive protection system is introduced into a slope 1 excavation protection project close to a building, particularly a high slope project, and is high in safety and simple in process. Before the side slope 1 is excavated, the whole side slope 1 is wrapped and protected by the SNS flexible network 2, the threat of the collapse of large rocks to the infrastructures such as adjacent structures is solved, and the active SNS protection system 'net leakage' or the excavation of small blocks of high side slope to impact the infrastructures is prevented by the measures of the passive protection system. A reverse slope 1-2 excavation mode is adopted in the excavation process of the side slope 1, namely, the inner side of the side slope 1 is excavated firstly, a protective belt is formed at the top of the side slope 1, mechanical equipment is adopted for removing dangerous rocks to the opposite direction of the excavation protection facilities of the side slope 1, rocks are reduced to enter a safety protection net, the safety mode of the excavation mode is realized, and the construction safety is better ensured.
It is right above the utility model provides an existing railway high slope initiative net protection adverse slope system of next-door neighbour has carried out detailed introduction, and the description of specific embodiment is only used for helping understanding the utility model discloses a method and its core thought. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (6)
1. Next to existing railway high slope initiative net protection adverse slope system, its characterized in that: comprises an SNS active protection system and a passive protection system,
the SNS active protection system mainly comprises an SNS flexible net, transverse supporting ropes, longitudinal supporting ropes, a sewing rope and a prestressed anchor rod, anchor rod orifices are arranged and excavated on the side slope in the longitudinal and transverse directions, the prestressed anchor rod is fixed in the anchor rod orifices, the transverse supporting ropes and the longitudinal supporting ropes are tied on the prestressed anchor rod, the SNS flexible net is connected to the transverse supporting ropes and the longitudinal supporting ropes by the sewing rope, and the SNS flexible net is tightly attached to the slope surface of the side slope;
a groove is dug at the bottom of the side slope, a passive protection system is erected in the groove and mainly comprises an SNS flexible net tower foundation, upright posts and guard plates, a plurality of upright post spacing holes are transversely arranged in the groove, the upright posts are inserted into the upright post spacing holes for fixation, and the guard plates are transversely erected between two adjacent upright posts; and the SNS flexible net tower base is fixed on the side of the guard plate and pulls the transverse supporting rope and the longitudinal supporting rope.
2. The active net protection system against reverse slope next to an existing railway high slope according to claim 1, characterized in that: the SNS flexible network tower footing is higher than the vertical rods and the guard plates, and a cushion pad is installed on one side, facing the slope side, of the SNS flexible network tower footing.
3. The active net protection system against reverse slope next to an existing railway high slope according to claim 2, characterized in that: the SNS flexible net column foot is H shaped steel board, and H shaped steel board stands in the fender apron outside that deviates from side slope one side to two pole settings adjacent with H shaped steel board and fender apron are higher than other pole settings and fender apron that the slot set up, and wherein, the blotter adopts junked tire to hang in one side that H shaped steel board is close to fender apron.
4. The active net protection system against reverse slope next to an existing railway high slope according to claim 3, characterized in that: and the H-shaped steel plate is also provided with a pull rod fixed at the bottom of the side slope.
5. The active net protection system against reverse slope next to an existing railway high slope according to claim 1, characterized in that: the anchor rod hole is an anchor rod pit, and the upper plane of the anchor rod hole is lower than the upper surface of the side slope.
6. The active net protection system against reverse slope next to an existing railway high slope according to claim 4 or 5, characterized in that: and a buffer groove is also arranged at the slope bottom of the side slope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920636652.2U CN209975544U (en) | 2019-05-06 | 2019-05-06 | Active net protection back slope system next to existing railway high slope |
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| CN201920636652.2U CN209975544U (en) | 2019-05-06 | 2019-05-06 | Active net protection back slope system next to existing railway high slope |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501794A (en) * | 2020-04-29 | 2020-08-07 | 中铁二院工程集团有限责任公司 | Anchoring device, anchoring system and construction method for reinforcing and protecting high and steep slope |
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2019
- 2019-05-06 CN CN201920636652.2U patent/CN209975544U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501794A (en) * | 2020-04-29 | 2020-08-07 | 中铁二院工程集团有限责任公司 | Anchoring device, anchoring system and construction method for reinforcing and protecting high and steep slope |
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