CN213390168U - Combined supporting structure for long and short anchor rods of composite rock slope - Google Patents

Abstract

The utility model discloses a combined supporting structure of long and short anchor rods of a composite rock slope, which comprises a stable rock stratum and a weak broken layer covered above the stable rock stratum, wherein a steel wire mesh is laid above the weak broken layer and is fixedly connected with one end of the short anchor rod inserted into the weak broken layer; the steel wire mesh is fixedly connected with one end of a long anchor rod which penetrates through the weak crushing layer and is inserted into the stable rock stratum; and spraying concrete above the steel wire mesh to form a sprayed concrete layer, hardening the slope surface and forming the integral combined support. The structure has reasonable design and low cost, and can effectively control the composite rock slope engineering disasters.

Description

Combined supporting structure for long and short anchor rods of composite rock slope

Technical Field

The utility model belongs to the technical field of the support of rock matter side slope, concretely relates to long short stock combined support structure of compound rock matter side slope.

Background

The construction content of slope support can be related to the fields of tunnel engineering, pumped storage engineering and mining engineering. The composite rock slopes are one of the slope types. Due to the fact that discontinuous surfaces such as inner layer reason and joint of the composite rock slope develop, rock layers are soft and broken, supporting difficulty is high, the slope repairing cost is high, the bonding coefficient of all rock layers is small, large-surface landslide accidents are easily caused in the tunnel tunneling, pumping excavation or mineral exploitation construction process, and the safety and construction progress of engineering are seriously affected. At present, anchor rods with uniform lengths are mostly adopted in anchor rod supporting and other anchor rod combined supporting systems of rock slopes, so that the slopes can be effectively protected, but the distribution form of geological layers of the slopes is not considered, and great waste is caused.

Based on the background, it is necessary to develop a composite rock slope supporting structure aiming at the rock slopes, which can meet the requirements of engineering slope protection engineering, save engineering investment and reduce waste. Therefore, a combined supporting structure of long and short anchor rods of a composite rock slope is produced at the same time.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a length stock combined supporting structure that structural design is reasonable, with low costs, and can the effective control compound rock slope engineering calamity.

The utility model discloses a following technical scheme realizes:

a combined supporting structure of long and short anchor rods of a composite rock slope comprises a stable rock stratum and a weak broken layer covered above the stable rock stratum, wherein a steel wire mesh is laid above the weak broken layer and fixedly connected with one end of a short anchor rod inserted into the weak broken layer; the steel wire mesh is fixedly connected with one end of a long anchor rod which penetrates through the weak crushing layer and is inserted into the stable rock stratum; and spraying concrete above the steel wire mesh to form a sprayed concrete layer, hardening the slope surface and forming the integral combined support.

As a preferable technical scheme, the length of the long anchor rod penetrating into the stable rock stratum is not less than 0.5 m.

As a preferable technical scheme, the length of the short anchor rod extending into the weak broken layer is not less than 0.5 m.

As a preferred technical scheme, one end of each of the long anchor rods and the short anchor rods, which is connected with the steel wire mesh, is set to be L-shaped.

As a preferred technical solution, the long anchor rods and the short anchor rods are arranged on the steel wire mesh in a quincunx shape.

As a preferred technical scheme, the overlapping length between two adjacent steel wire meshes is not less than the size of one grid.

As an optimal technical scheme, the distance between the steel wire mesh and the slope surface is not more than 3-5 cm.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model discloses an establish compound rock matter side slope model, utilize the different principles of stock effect to carry out engineering design for the foundation to when reaching side slope stable support, reduced the use amount of stock reinforcing bar, used the great engineering of side slope support engineering volume and had apparent economic benefits.

2. According to the action mechanism and the extrusion and connection effect of the composite beam, the short anchor rods are anchored into a series of short anchor rods in the rock slope of the composite layer, the weak and broken area within the length of the anchor rods is anchored into the rock composite beam, and after prestress is applied to the anchor rods, cracks can be prevented from being continuously expanded, rock strata in the action area are extruded and reinforced, so that the integrity of the rock composite beam is improved, and local collapse is prevented.

3. The long anchor rod hangs the weak rock stratum in the stable rock stratum inside the side slope inversely according to the suspension action mechanism, and the external weak crushing area is prevented from being crushed and falling off.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a schematic structural view of a cross-section part of the present invention.

Reference numerals: 1. stabilizing the rock formation; 2. a weak crushed layer; 3. steel wire mesh; 4. short anchor rods; 5. a long anchor rod; 6. and (5) spraying a concrete layer.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Example 1:

referring to attached drawings 1 and 2, the combined supporting structure for the long and short anchor rods of the composite rock slope comprises a stable rock stratum 1 and a weak broken layer 2 covering the stable rock stratum 1, a steel wire mesh 3 is laid above the weak broken layer 2, and the steel wire mesh 3 is fixedly connected with one end of a short anchor rod 4 inserted into the weak broken layer 2; the steel wire mesh 3 is fixedly connected with one end of a long anchor rod 5 which penetrates through the weak crushing layer 2 and is inserted into the stable rock stratum 1; and spraying concrete above the steel wire mesh 3 to form a sprayed concrete layer 6, hardening the slope surface and forming the integral combined support.

Further, in another embodiment, the length of the long anchor rod 5 penetrating into the stable rock formation 1 is not less than 0.5 m. The long anchor rod 5 hangs the weak rock stratum upside down in the stable rock stratum inside the side slope according to the suspension action mechanism, and prevents the external weak crushing area from being crushed and falling off.

Further, in another embodiment, the length of the short anchor rods 4 penetrating into the weak fractured layer 2 is not less than 0.5 m. Wherein, the length of the short anchor rod 4 is determined by the soft broken layer, and the length of the short anchor rod is connected with the soft broken layer into a whole.

Further, in another embodiment, the ends of the long anchor rods 5 and the short anchor rods 4 connected with the steel wire mesh 3 are respectively provided with an L shape.

Further, in another embodiment, the long anchor rods 5 and the short anchor rods 4 are arranged on the steel wire mesh 3 in a quincunx shape.

Further, in another embodiment, the overlapping length between two adjacent steel wire meshes 3 is not less than one mesh size.

Further, in another embodiment, the steel wire mesh 3 should be attached to the slope surface as close as possible, and the distance between the steel wire mesh 3 and the slope surface is not more than 3-5 cm.

Furthermore, the utility model discloses well slope also can be replaced by TBS grass planting domatic class form. And if the stable rock stratum 1 is buried deeply, the corresponding long anchor rod 5 can be adjusted to be an anchor rope for combined support, so that a short anchor rod-anchor rope combined support system is formed.

The utility model also provides a construction method of compound rock side slope length stock combined support structure, including following step:

(a) excavating by adopting an excavator according to a design scheme and assisting in manual cleaning to clean the side slope. And (4) removing scum, boulders, loose rock bodies, lodging, broken rock bodies and the like in the slope clearing range. The slope surface after slope clearing should be in smooth transition, should not have abrupt bank and overhang rock mass etc..

(b) And laying a steel wire mesh 3 on the cleaned slope surface to form net-shaped protection. The steel wire mesh 3 must be laid along the slope, and the size deviation of the mesh should be controlled within +/-10 mm of the design requirement. The lapping length of the steel wire meshes 3 is not less than the size of one mesh, the steel wire meshes 3 are tightly attached to the slope surface as much as possible, and the distance between the steel wire meshes 3 and the slope surface is not more than 3-5 cm according to the specification requirement.

(c) According to the layering condition of the composite rock slope obtained from geological survey results, quincunx arrangement is adopted, and parameters A1 and B1 of row spacing between long anchor rods and short anchor rods are designed. The length of the anchor rod is determined according to the principle that the length L1 of the long anchor rod at least extends to a stable rock stratum by more than 0.5m and meets the requirements of the technical specifications of the building slope engineering. The length L2 of the short anchor rod should pass through the weak broken layer by more than 0.5m and meet the requirements of the construction slope engineering technical specifications. The end of the anchor rod on the side of the adhered slope is processed to be L-shaped (the anchor rod can be directly processed or welded) and is firmly connected with the steel wire mesh.

(d) After the net hanging reinforcing steel bars and the anchor rods are arranged, spraying concrete is prepared according to the mixing proportion and the additives selected in a laboratory and a field test, and the slope surface is hardened by spraying the concrete by a spraying machine in a wet spraying method. The concrete operation should be carried out in a segmented and segmented mode, the spraying sequence is from bottom to top, the initial setting time and the final setting time of the sprayed concrete should meet the requirements of design drawings and field spraying processes, the initial setting time is not longer than 5min generally, and the final setting time is not longer than 10min generally. The various properties of the sprayed concrete must meet the design specifications. During the construction of the sprayed concrete, the slope drainage holes are protected so as not to be blocked. After the construction of the sprayed concrete is finished, the maintenance and protection are carried out in time according to the regulations of relevant documents.

Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are used for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims (7)

1. The utility model provides a long short stock combined support structure of compound rock matter side slope, includes stable rock stratum (1) and covers weak broken layer (2) above it, its characterized in that: a steel wire mesh (3) is laid above the weak crushing layer (2), and the steel wire mesh (3) is fixedly connected with one end of a short anchor rod (4) inserted into the weak crushing layer (2); the steel wire mesh (3) is fixedly connected with one end of a long anchor rod (5) which penetrates through the weak crushing layer (2) and is inserted into the stable rock stratum (1); and concrete is sprayed above the steel wire mesh (3) to form a sprayed concrete layer (6), and the slope surface is hardened to form an integral combined support.

2. The composite rock slope long and short anchor rod combined supporting structure of claim 1, which is characterized in that: the length of the long anchor rod (5) penetrating into the stable rock stratum (1) is not less than 0.5 m.

3. The composite rock slope long and short anchor rod combined supporting structure of claim 1 or 2, which is characterized in that: the length of the short anchor rod (4) extending into the weak broken layer (2) is not less than 0.5 m.

4. The composite rock slope long and short anchor rod combined supporting structure of claim 1, which is characterized in that: and the long anchor rods (5) and the short anchor rods (4) are respectively arranged in an L shape at one end connected with the steel wire mesh (3).

5. The composite rock slope long and short anchor rod combined supporting structure of claim 1, which is characterized in that: the long anchor rods (5) and the short anchor rods (4) are arranged on the steel wire mesh (3) in a quincunx shape.

6. The composite rock slope long and short anchor rod combined supporting structure of claim 1, which is characterized in that: the overlapping length between two adjacent steel wire meshes (3) is not less than the size of one mesh.

7. The composite rock slope long and short anchor rod combined supporting structure of claim 1, which is characterized in that: the distance between the steel wire mesh (3) and the slope surface is not more than 3-5 cm.

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