Flexible snow fence barrier system

Abstract

The present application relates to a kind of flexible snow fence protection system, belong to avalanche protection system technical field.The present application includes stand, stand is at least two, stand is transversely spaced and fixedly arranged on slope, slope includes the upper slope of the side of stand towards slope top and the lower slope of the side of stand towards slope foot, the flexible snow fence protection system further includes first base anchor rod and second base anchor rod, first base anchor rod is transversely spaced and fixedly arranged on upper slope, second base anchor rod is transversely spaced and fixedly arranged on lower slope;The upper end of stand is fixedly connected with the flexible metal mesh that is continuously arranged along transverse direction, the lower end of flexible metal mesh is obliquely extended to the region of first base anchor rod, and is fixedly connected together with first base anchor rod;The upper end of stand is fixedly connected with pull-down anchor rope, and the lower end of pull-down anchor rope is fixedly connected with second base anchor rod.The present application has higher impact resistance, is more easily transported and installed.

Description

TECHNICAL FIELD

[0001] The present application relates to a flexible snow fence protection system, belonging to the technical field of snow avalanche protection system. BACKGROUND

[0002] Snow avalanche is a natural disaster with the characteristics of collapse, landslide, debris flow and storm, which determines its unpredictability, difficulty in control and severity of damage. Therefore, it is of practical significance to control and protect snow avalanches in high-cold mountainous areas to protect the facilities or roads below.

[0003] There are two basic methods for snow avalanche control and protection at present, one is blasting induction, and the other is to use some special protection structures. The blasting technique has been used to intentionally induce snow avalanches for many years, and the fundamental purpose is to plan to induce one or more small-scale and controllable snow avalanches by blasting before the size and potential damage of the potential snow avalanche body grow rapidly to an uncontrollable degree, so as to avoid the occurrence of large-scale and unpredictable destructive snow avalanches. The structure control method includes setting up a fence in the formation area and setting up a snow shed in the particularly dangerous section of the railway or highway. The former is a direct control method, which can reduce or avoid the secondary accumulation of snow blown or slid from the surrounding to the formation area, and has a certain anti-sliding effect on the upper snow body; the latter is similar to the shielding effect of rockfall (but the structure stress is very different, the rock stopping net mainly bears impact load, and the snow fence mainly bears static load). Sometimes, a diversion control structure can be used to disperse the snow avalanche body and minimize the impact.

[0004] For the structure control and protection of snow avalanches, due to the lack of relevant research and the small number of snow disaster areas in China, the traditional steps, steel fences and rock retaining walls are still the main methods at present. The traditional protection needs to excavate a large foundation, transport a large amount of materials, has slow progress, high labor intensity, large construction interference, low safety degree, low impact resistance and short service life. These factors make it difficult to reduce the engineering cost and the protection effect is not ideal. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a flexible snow fence protection system with better economy, which can not only solve the main problems of service life, bearing capacity and flexible and continuous arrangement, but also has higher impact resistance, is lighter, easier to transport and install, and other advantages.

[0006] The technical scheme adopted by the present application to solve its technical problems is: the flexible snow fence protection system comprises a stand, the stand is at least two, the stand is transversely spaced and fixedly arranged on the slope surface, the slope surface comprises an upper slope surface located on one side of the stand towards the slope top and a lower slope surface located on one side of the stand towards the slope foot, the flexible snow fence protection system further comprises a first base anchor rod and a second base anchor rod, the first base anchor rod is transversely spaced and fixedly arranged on the upper slope surface, and the second base anchor rod is transversely spaced and fixedly arranged on the lower slope surface; the upper end of the stand is fixedly connected with a flexible metal mesh arranged continuously in the transverse direction, the lower end of the flexible metal mesh is inclinedly extended to the area where the first base anchor rod is located, and the flexible metal mesh is fixedly connected with the first base anchor rod together; the upper end of the stand is fixedly connected with a pull-down anchor rope, and the lower end of the pull-down anchor rope is fixedly connected with the second base anchor rod.

[0007] Further, the center distance between adjacent stands is 3-4 m, the stand and the first base anchor rod are arranged in a staggered manner; the flexible metal mesh is provided with a steel wire pull rope, the steel wire pull rope comprises a first transverse pull rope arranged between adjacent two stands, a second transverse pull rope arranged between adjacent two first base anchor rods, and an inclined pull rope arranged between the stand and the first base anchor rod, each stand is fixedly connected with two inclined pull ropes, one of which is fixedly connected with the first base anchor rod above the left of the stand, and the other is fixedly connected with the first base anchor rod above the right of the stand; the first transverse pull rope is fixedly connected with the connecting point on the corresponding stand, and the second transverse pull rope is fixedly connected with the connecting point on the corresponding first base anchor rod.

[0008] Further, the end of the steel wire pull rope forms a rope sleeve ring for connecting the stand and a rope sleeve ring for connecting the first base anchor rod, and the first base anchor rod is provided with a fixed steel rope ring for connecting the steel wire pull rope.

[0009] Further, the flexible metal mesh is composed of a plurality of mesh units arranged transversely and spaced, the mesh units are connected by shackles or stitched by steel wire ropes, the outer boundary line of each mesh unit is triangular, the steel wire pull rope is fixedly arranged on the outer edge of each mesh unit, and the steel wire pull rope forms a rope sleeve ring at the corner of the outer boundary line of each mesh unit.

[0010] Further, the fixed steel rope ring is formed by winding a steel rope for not less than 3 turns, and the joint is fixed by a rope clamp.

[0011] Further, the stand and the second base anchor rod are arranged one by one, and the second base anchor rod is arranged directly below the stand.

[0012] Further, the side of the flexible metal mesh facing the upper slope surface is stacked with an inner small mesh, and the mesh aperture of the inner small mesh is smaller than that of the flexible metal mesh.

[0013] Further, the column body of the column is a circular steel pipe, the top end of the column has a plurality of axially spaced pin holes, and the spacing formed by inserting two steel pipe pins into the pin holes serves as a connection area for connecting the downward pulling anchor rope and the flexible metal mesh.

[0014] Further, the lower end of the column is fixedly connected to a column base, and the column base is one or more of the following structures:

[0015] The first structure is suitable for a rock slope, and the column base is a micro steel pipe pile directly arranged on a rock base on the slope surface;

[0016] The second structure is suitable for a soft rock or soil slope, and the column base is a concrete base arranged on the slope surface, and a steel reinforcement frame for connecting the column is embedded in the concrete base;

[0017] The third structure is suitable for a loose soil slope, and the column base comprises at least two micro steel pipe piles arranged on the slope surface, the axes of the two adjacent micro steel pipe piles form a set angle, and the outer ends of the micro steel pipe piles are connected by a connecting plate to form an integral base;

[0018] The fourth structure is suitable for a frozen soil slope, and the column base is a pressure disc base connected to a third base anchor rod on the upper slope surface through at least two pressure disc pulling ropes, and a pressure disc connecting boss for connecting the column is arranged in the middle of the pressure disc base.

[0019] Further, for the column base suitable for a loose soil slope, the number of micro steel pipe piles is two, and the axes of the two micro steel pipe piles form a 45° angle.

[0020] The snow retaining fence has the advantages that: the high-strength flexible metal mesh is used as the retaining surface structure, so that the snow retaining fence has very good bearing capacity; the base anchor rod and the column are used as the main support structure, so that the snow retaining fence can be arranged almost anywhere on the snow-covered slope surface, and the terrain adaptability is strong; the base requirement is low, and the installation is fast; the engineering investment is small, and the economy is good.

[0021] The snow retaining fence mainly adopts a flexible metal structure, and the structure type can be diversified, serialized and standardized. The column angle, steel wire pulling rope inclination and flexible metal mesh angle can be flexibly adjusted to adapt to the slope surface. In the field of snow avalanche disaster prevention engineering, it is safe, reliable, simple, easy to implement, environmentally friendly and economical, and is especially suitable for engineering implementation in high-altitude areas.

[0022] In implementation, the snow retaining fence can be arranged from the middle and upper section of the slope surface, and can be arranged in multiple, continuous or intermittent flexible arrangements, so as to reduce the amount of snow retaining fence used in the entire project; after the snow melts, the flexible mesh can smoothly pass through the mesh holes, and the stones and wood blocks will be intercepted outside the fence, achieving the dual effects of snow retaining and rockfall interception.

[0023] Compared with the traditional snow fixing structure, the flexible snow fixing fence protection system greatly reduces the construction engineering quantity of the foundation anchor, reduces the disturbance to the original stable snow layer in the foundation implementation engineering, and reduces the overall stability risk of the snow layer; and is more economical in material usage.

[0024] The present application can be used as avalanche protection, and is especially suitable for slope surface disaster protection in high-altitude slope climate conditions, high frequency of avalanche occurrence, and accompanying rockfall. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the facade structure of an embodiment of the present application;

[0026] Figure 2 is a schematic view of the side structure of Figure 1 ;

[0027] Figure 3 is a schematic view of the local structure triangular boundary rope net structure of Figure 1 ;

[0028] Figure 4 is a schematic view of the local structure column top structure connection of Figure 1 ;

[0029] Figure 5 is a column foundation structure suitable for rock slope geological conditions.

[0030] Figure 6 is a column foundation structure suitable for soft rock or soil slope geological conditions.

[0031] Figure 7 is a column foundation structure suitable for loose soil slope geological conditions.

[0032] Figure 8 is a column foundation structure suitable for frozen soil slope geological conditions.

[0033] In the above drawings, the corresponding part names of the reference signs are as follows:

[0034] 1-column, 2-column foundation, 3-slope surface, 4-first foundation anchor rod, 5-second foundation anchor rod, 6-fixed steel rope ring, 7-steel wire rope, 8-steel pipe pin, 9-pull-down anchor rope, 10-inner small net, 11-flexible metal mesh, 12-rope sleeve ring, 13-concrete foundation, 14-connection plate, 15-pressing disc pull rope, 16-pressing disc foundation, 17-pressing disc connection boss, 18-mini steel pipe pile, 19-steel reinforcement cage. DETAILED DESCRIPTION

[0035] The present application will be further described below in combination with the drawings and embodiments.

[0036] AsFigures 1 to 4 As shown, the flexible snow fence protection system of the present application comprises at least two vertical columns 1, which are transversely spaced and fixedly arranged on a slope surface 3, the slope surface 3 comprises an upper slope surface located on the side of the vertical column 1 towards the slope top and a lower slope surface located on the side of the vertical column 1 towards the slope bottom, the flexible snow fence protection system further comprises a first base anchor 4 and a second base anchor 5, the first base anchor 4 is transversely spaced and fixedly arranged on the upper slope surface, and the second base anchor 5 is transversely spaced and fixedly arranged on the lower slope surface; the upper end of the vertical column 1 is fixedly connected with a flexible metal mesh 11 arranged continuously along the transverse direction, the lower end of the flexible metal mesh 11 is obliquely extended to the area where the first base anchor 4 is located, and is fixedly connected with the first base anchor 4; the upper end of the vertical column is fixedly connected with a downward pulling anchor rope 9, and the lower end of the downward pulling anchor rope 9 is fixedly connected with the second base anchor 5. Wherein, the flexible metal mesh 11 can be a steel wire rope mesh or a cable mesh, and adjacent meshes are connected by shackles or stitched by steel wire ropes.

[0037] The basic driving factor of an avalanche is its own weight, but this factor always exists before the avalanche occurs, that is, it makes the accumulated snow body in a critical unstable state, or in other words, a potential avalanche has been formed. The stability of the potential avalanche body is extremely fragile, and will collapse under the action of a certain external force. The flexible snow fence protection system of the present application belongs to a kind of avalanche structure protection, which is used in the starting area of an avalanche, mainly plays a role of blocking and reinforcing, and the purpose is to fix snow and prevent the occurrence of an avalanche. The basic structure of the flexible snow fence protection system is similar to that of a common stone blocking net, but the structural form is quite different, mainly in that, unlike the stone blocking net which mainly bears impact load, the snow fence mainly bears static load, including the weight of the snow accumulated on the net and the pressure from the snow body on the upstream slope, and the structural design can be completed by using the principle of structural mechanics, and a standard structure form can be established according to the slope angle, the expected snow accumulation (thickness) in a winter, etc., and a pressure relief ring is no longer used. In order to avoid excessive inclination of the fence under the action of a large static load, causing a significant reduction in height, and also to prevent the cracking of the upstream snow body under such a large displacement to exert a greater force on the fence, even leading to the loss of the snow fixing function of the fence, the upward stretching fixation of the snow fence in the present application is not achieved by using a pulling anchor rope, but by using the flexible metal mesh 11 itself, and for this purpose, the flexible metal mesh 11 is obliquely arranged on the upper slope surface (for details, please refer to Figure 2 ). The height of the fence is generally determined according to the expected snow thickness, and a reserve factor of 1.2-1.5 is considered. Generally, the fence needs to be arranged in sections at different elevations along the slope surface, and the distance between the sections is determined according to the size of the load that the snow body between the two fences may exert on the lower fence and the carrying capacity of the fence, and a safety factor of 1.2-1.5 is considered.

[0038] The snow fence mainly considers the bearing strength and rigidity, and the flexible metal mesh 11 has appropriate flexibility mainly to enable the fence to realize load balance adjustment and avoid local stress concentration.

[0039] To further improve the bearing strength and rigidity of the snow fence, the application can further preferably adopt the following structural scheme: the stand column 1 and the first foundation anchor rod 4 are arranged in a staggered manner; the flexible metal mesh 11 is provided with a steel wire pull rope 7, the steel wire pull rope 7 includes a first transverse pull rope arranged between two adjacent stand columns 1, a second transverse pull rope arranged between two adjacent first foundation anchor rods 4, and an inclined pull rope arranged between the stand column 1 and the first foundation anchor rod 4, each stand column 1 is fixedly connected with two inclined pull ropes, one of which is fixedly connected with the first foundation anchor rod 4 above the left of the stand column 1, and the other of which is fixedly connected with the first foundation anchor rod 4 above the right of the stand column 1; the first transverse pull rope is fixedly connected with the connecting point on the corresponding stand column 1, and the second transverse pull rope is fixedly connected with the connecting point on the corresponding first foundation anchor rod 4.

[0040] After adopting the structural mode, the first transverse pull rope and the two inclined pull ropes can form a triangular boundary rope net, and the second transverse pull rope can also form a triangular boundary rope net with the two inclined pull ropes, and the typical structure of a single triangular boundary rope net can be referred to Figure 1 and Figure 3 The steel wire pull rope 7 can better share the stress.

[0041] To facilitate connection and assembly, the end of the steel wire pull rope 7 is formed with a rope sleeve ring 12 for connecting the stand column 1 and a rope sleeve ring 12 for connecting the first foundation anchor rod 4, and the first foundation anchor rod 4 is provided with a fixed steel rope ring 6 for connecting the steel wire pull rope 7.

[0042] In addition, the flexible metal mesh 11 is composed of a plurality of mesh units arranged transversely and spaced apart, the mesh units are connected by shackles or stitched by steel wire ropes, and the outer boundary line of a single mesh unit can be a rectangular structure or a triangular structure. To adapt to the arrangement mode of the steel wire pull rope 7, the outer boundary line of each mesh unit is triangular in the embodiment, the steel wire pull rope 7 is fixedly arranged at the outer edge of each mesh unit, the steel wire pull rope 7 forms a rope sleeve ring 12 at the corner of the outer boundary line of each mesh unit, and the specific structure can be referred to Figure 3 .

[0043] To make the structure simple and reliable, the fixed steel rope ring 6 is formed by winding a steel rope for not less than 3 turns, and the joint is fixed by a rope clamp.

[0044] To reduce the basic workload, the number of second foundation anchor rods 5 is preferably the same as the column 1, and the column 1 is provided one by one with the second foundation anchor rod 5, and the second foundation anchor rod 5 is arranged directly below the column 1.

[0045] To improve the protection performance and make the structure simple and reliable, the inner small mesh 10 is stacked on one side of the flexible metal mesh 11 facing the upper slope surface, and the mesh aperture of the inner small mesh 10 is smaller than the mesh aperture of the flexible metal mesh 11.

[0046] Preferably, the column body of the column 1 is a circular steel pipe, the top end of the column 1 has a plurality of axially spaced pin holes, and the spacing space formed by inserting the two steel pipe pins 8 into the pin holes serves as a connection area for connecting the pull-down anchor rope 9 and the flexible metal mesh 11. By adjusting the connection position of the steel pipe pin 8, the inclination angle of the pull-down anchor rope 9 and the installation angle of the flexible metal mesh 11 can be adjusted. The steel pipe pin 8 can play a limiting role to ensure the reliability of the connection structure.

[0047] The lower end of the column 1 is fixedly connected to the column foundation 2, and the column foundation 2 is one or more of the following structures:

[0048] The first one is suitable for rock slope, referring to Figure 5 , the column foundation 2 is a micro steel pipe pile 18 arranged directly on the rock foundation of the slope surface 3.

[0049] The second one is suitable for soft rock or soil slope, referring to Figure 6 , the column foundation 2 is a concrete foundation 13 arranged on the slope surface 3, and the concrete foundation 13 has a steel reinforcement frame 19 embedded therein for connecting the column 1; the concrete foundation 13 can be constructed according to the conventional process, that is, a foundation pit is excavated on the slope surface 3, the size of the foundation pit is generally 400mm in length, 400mm in width and 500mm in depth, then the embedded steel reinforcement frame 19 is placed, and the concrete is poured to form the concrete foundation 13.

[0050] The third one is suitable for loose soil slope, referring to Figure 7 , the column foundation 2 comprises at least two micro steel pipe piles 18 arranged on the slope surface 3, the axes of the two adjacent micro steel pipe piles 18 form a set angle, and the outer ends of the micro steel pipe piles 18 are connected by a connecting plate 14 to form a whole foundation; preferably, the number of micro steel pipe piles 18 is two, and the axes of the two micro steel pipe piles 18 form a 45° angle.

[0051] The fourth one is suitable for permafrost slope, referring to Figure 8 , the column foundation 2 is a pressure disc foundation 16 connected to the third foundation anchor rod of the upper slope surface by at least two pressure disc pull ropes 15, and the middle part of the pressure disc foundation 16 is provided with a pressure disc connecting boss 17 for connecting the column 1.

[0052] The micro steel pipe pile 18 generally refers to a cast-in-place pile with a pile diameter less than 400 mm, a slenderness ratio greater than 30, and a drilling, strong reinforcement and pressure grouting construction process. In implementation, the corresponding column foundation 2 structure form can be selected according to the geological conditions of the slope surface 3.

Claims

1. A flexible snow-fixing fence protection system, comprising posts (1), wherein there are at least two posts (1), the posts (1) are fixedly installed laterally at intervals on a slope (3), the slope (3) comprising an upper slope on the side of the posts (1) facing the top of the slope and a lower slope on the side of the posts (1) facing the bottom of the slope, characterized in that: It also includes a first foundation anchor (4) and a second foundation anchor (5). The first foundation anchor (4) is fixedly installed on the upper slope at a horizontal interval, and the second foundation anchor (5) is fixedly installed on the lower slope at a horizontal interval. The upper end of the column (1) is fixedly connected to a flexible metal mesh (11) arranged continuously in the horizontal direction. The lower end of the flexible metal mesh (11) extends obliquely to the area where the first foundation anchor (4) is located and is fixedly connected to the first foundation anchor (4). The upper end of the column is fixedly connected to a pull-down anchor rope (9), and the lower end of the pull-down anchor rope (9) is fixedly connected to the second foundation anchor (5). The column body of the column (1) is a circular steel pipe. The top of the column (1) has multiple pin holes distributed at a horizontal interval. The space formed by inserting two steel pipe pins (8) into the pin holes serves as the connection area for connecting the pull-down anchor rope (9) and the flexible metal mesh (11). The lower end of the column (1) is fixedly connected to the column foundation (2), and the column foundation (2) is one or more of the following structures: The first type is suitable for rock slopes, and the column foundation (2) is a miniature steel pipe pile (18) directly set on the rock foundation (3) of the slope. The second type is suitable for soft rock or soil slopes. The column foundation (2) is a concrete foundation (13) set on the slope (3). The concrete foundation (13) is pre-embedded with a steel reinforcement cage (19) for connecting the column (1). The third type is suitable for loose soil slopes. The column foundation (2) includes at least two micro steel pipe piles (18) set on the slope surface (3). The axes of two adjacent micro steel pipe piles (18) form a set angle. The outer ends of the micro steel pipe piles (18) are connected by connecting plates (14) to form an integral foundation. The fourth type is applicable to frozen and thawed soil slopes. The column foundation (2) is a pressure plate foundation (16), which is connected to the third foundation anchor on the upper slope by at least two pressure plate ropes (15). The middle part of the pressure plate foundation (16) is provided with a pressure plate connecting boss (17) for connecting the column (1).

2. The flexible snow-fixing fence protection system as described in claim 1, characterized in that: The center-to-center distance between adjacent columns (1) is 3m to 4m, and the columns (1) and the first foundation anchors (4) are arranged in an alternating manner. Steel wire ropes (7) are threaded through the flexible metal mesh (11). The steel wire ropes (7) include a first transverse rope between two adjacent columns (1), a second transverse rope between two adjacent first foundation anchors (4), and a diagonal rope between the column (1) and the first foundation anchor (4). Each column (1) is fixedly connected to two diagonal ropes. One diagonal rope is fixedly connected to the first foundation anchor (4) on the upper left of the column (1), and the other diagonal rope is fixedly connected to the first foundation anchor (4) on the upper right of the column (1). The first transverse ropes are fixedly connected to the connection points on the corresponding columns (1), and the second transverse ropes are fixedly connected to the connection points on the corresponding first foundation anchors (4).

3. The flexible snow-fixing fence protection system as described in claim 2, characterized in that: The end of the wire rope (7) forms a rope loop (12) for connecting the column (1) and a rope loop (12) for connecting the first foundation anchor (4). The first foundation anchor (4) is provided with a fixed steel rope loop (6) for connecting the wire rope (7).

4. The flexible snow-fixing fence protection system as described in claim 3, characterized in that: The flexible metal mesh (11) is composed of multiple mesh units arranged horizontally at intervals. The mesh units are connected by shackles or sewn together with steel wire ropes. The outer boundary line of each mesh unit is triangular. The steel wire rope (7) is fixedly set on the outer edge of each mesh unit. The steel wire rope (7) forms a rope loop (12) at the corner of the outer boundary line of each mesh unit.

5. The flexible snow-fixing fence protection system as described in claim 3, characterized in that: The fixed steel rope ring (6) is made by coiling a steel rope for no less than 3 turns, and the joint is fixed with a rope clamp.

6. The flexible snow-fixing fence protection system as described in claim 1, characterized in that: The column (1) and the second foundation anchor (5) are set in a one-to-one correspondence, with the second foundation anchor (5) located directly below the column (1).

7. The flexible snow-fixing fence protection system as described in any one of claims 1 to 6, characterized in that: An inner mesh (10) is stacked on the side of the flexible metal mesh (11) facing the upper slope. The mesh size of the inner mesh (10) is smaller than that of the flexible metal mesh (11).

8. The flexible snow-fixing fence protection system as described in any one of claims 1 to 6, characterized in that: For column foundations (2) suitable for loose soil slopes, the number of micro steel pipe piles (18) is two, and the axes of the two micro steel pipe piles (18) are at a 45° angle.

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