Construction method of truss type steel wire rope suspended artificial false bottom

Abstract

The invention discloses a truss type steel wire rope suspended artificial false bottom construction method. Relates to the technical field of mining false bottom construction. Comprising the following steps that S1, a plurality of anchor cables are driven into surrounding rocks of upper and lower walls of a vein roadway above a stope at intervals upwards, and the anchor cables are partially exposed to serve as suspension structures used for suspending a first-layer false bottom; s2, according to the span size of the stope and the length of the stope, trusses with the proper length are selected to form a truss net, and the trusses are connected through screws; s3, the truss net and the anchor cables are welded, and a plurality of hanging rings are installed on bottom ribs of the truss net; and S4, after the hanging rings are installed, concrete pouring is conducted, the strength of concrete can be selected according to the service life of the false bottom, and after pouring is completed, the concrete layer containing the truss net is the false bottom. S5, after the false bottom of the first layer is poured, stoping of the next layer can be conducted, and after stoping is completed, false bottom construction of the next layer is started; s6, the lower-layer false bottom is connected with the hanging rings of the upper-layer false bottom through steel wire ropes, and the lower-layer false bottom is hung through the hanging rings of the upper-layer false bottom; follow-up false bottom construction refers to the steps to complete false bottom construction of all the access roads; the concrete false bottom construction method adopting the steel wire ropes for hanging is provided for ore bodies with broken surrounding rocks of upper and lower walls, the stress structure of the concrete false bottom is effectively improved through the steel wire rope hanging bars, the stress structure of the concrete false bottom is changed from stress on one face to stress in a three-dimensional space, and safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mining false bottom construction, in particular to a truss type steel wire rope suspended artificial false bottom construction method. Background Art

[0002] During the mining process of extremely thin and broken veins, since the stability of the upper plate surrounding rock is difficult to control, the downward approach filling mining method is often used for ore body recovery. The downward approach filling method requires working under a false bottom. In the case of broken upper and lower plate surrounding rocks, the traditional false bottom suspension method cannot work, resulting in the false bottom being prone to overall collapse in the absence of a suspension structure, leading to safety risks during the recovery process. The commonly used artificial false bottom is a false bottom bottom reinforcement mesh in the form of a single / double-layer steel mesh or main and auxiliary reinforcement. Anchor rods are installed in the upper and lower plate surrounding rocks and used as suspension points. The false bottom suspension bars are installed on the anchor rods, and the other end of the suspension bars are connected to the bottom reinforcement mesh. Concrete is then poured so that the entire false bottom acts as a beam structure to support the filling body in the middle and upper part of the mining site. This type of flat steel mesh results in greater stress on the midpoint of the false bottom section, which makes the center of the artificial false bottom prone to cracking. In addition, when the upper and lower surrounding rocks are broken, anchor rods serving as suspension points cannot be installed on the upper and lower surrounding rocks, resulting in the risk of overall collapse of the false bottom. Summary of the invention

[0003] In view of the problems of the existing artificial false bottom suspension being difficult, the suspension process being complicated, and the poor firmness of the suspension points, the present application provides a two-color double-layer Xi'an cable extrusion die, which adopts the following technical solution:

[0004] A method for constructing an artificial false bottom by truss-type steel wire rope suspension includes the following steps:

[0005] S1. Drive multiple anchor cables into the surrounding rock of the upper and lower walls of the vein roadway above the stope at intervals, with the anchor cables partially exposed as a suspension structure for suspending the false bottom of the first layer;

[0006] S2. According to the span size and length of the stope, select trusses of appropriate length to form a truss network, and connect the trusses with screws;

[0007] S3, welding the truss net and the anchor cable, and installing a plurality of lifting rings on the bottom reinforcement of the truss net;

[0008] S4. After the installation of the lifting rings, concrete pouring is carried out. The strength of the concrete can be selected according to the service life of the false bottom. After the pouring is completed, the concrete layer containing the truss mesh is the false bottom.

[0009] S5. After the first layer of false bottom is poured, the next layer can be mined, and after the mining is completed, the next layer of false bottom construction can be started;

[0010] S6. The lower false bottom is connected to the lifting ring of the upper false bottom through a steel wire rope, and the lower false bottom is suspended through the lifting ring of the upper false bottom; the subsequent false bottom construction refers to the above steps to complete the false bottom construction of all approaches.

[0011] Furthermore, in step S1, the plurality of anchor cables are divided into two rows, each row comprising a plurality of anchor cables spaced apart along the length direction of the tunnel, the lower ends of the two rows of anchor cables being close to each other and the upper ends being far away from each other, forming an inverted figure eight shape.

[0012] Furthermore, in step S3, the hanging ring includes a rope body and a buckle, and the rope body is formed into a ring and fixed by the buckle to form a hanging ring.

[0013] Furthermore, in step S3, the lifting rings are installed at intervals, and each anchor cable is provided with a lifting ring at a position of the truss welded corresponding to the anchor cable, and the spacing of the lifting rings along the length direction of the access route is half of the spacing of the anchor cables.

[0014] Furthermore, in step S4, the strength of the concrete can be selected as C10 concrete or C20 concrete according to the service life of the false bottom, and the thickness of the false bottom is 50-100 cm.

[0015] Furthermore, in step S6, the steel wire ropes at the same node of the lower false bottom need to be connected to multiple lifting rings of the upper false bottom to form a triangular support.

[0016] In summary, this application includes the following beneficial technical effects:

[0017] 1. Reasonable structure and good stability. The steel wire rope suspension bar effectively improves the stress structure of the concrete false bottom, changing it from a surface stress structure to a stress structure in three-dimensional space;

[0018] 2. Large bearing capacity. The structural form of wire rope suspension bars + truss bottom reinforcement net improves the coupling between the bottom reinforcement structure and the concrete structure, effectively enhancing the reliability of the false bottom;

[0019] 3. The structure is simple and the form is flexible. It can construct artificial concrete false bottoms with different bearing capacities according to the length of service time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a method for constructing an artificial false bottom by suspending a truss-type steel wire rope according to the present invention;

[0021] Figure 2 for Figure 1 BB cross-section diagram;

[0022] Figure 3 for Figure 1 The C1-C1 cross-sectional view omitting the filling body;

[0023] Figure 4 for Figure 1 The C2-C2 cross-sectional view omitting the filling body;

[0024] Figure 5 It is a schematic diagram of a suspension ring of the present invention.

[0025] Description of reference numerals:

[0026] 1. Truss net; 2. Concrete; 3. Steel wire rope; 4. Anchor cable; 6. First layer false bottom lifting ring; 7. Second layer false bottom lifting ring; 8. Third layer false bottom lifting ring; 9. Filling body; 10. Rope body; 11. Buckle. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-5 This application is described in further detail.

[0028] The present invention provides a method for constructing an artificial false bottom with a truss-type steel wire rope suspension. The method aims to solve the problems of the existing artificial false bottom suspension being difficult, the suspension process being complicated, and the suspension point being poor in firmness. The method comprises the following steps:

[0029] S1. Drive two rows of 12-13m anchor cables 4 upward into the surrounding rock along the upper and lower walls of the vein tunnel above the stope, of which 10m are inside the rock ( Figure 1 The length of the anchor cable in the rock and soil is omitted, so the proportion in the figure is not the actual proportion), and the remaining length is exposed as a suspension structure for suspending the false bottom of the first floor. The installation position of the anchor cable 4 is as follows Figure 1 , Figure 2 As shown;

[0030] S2. According to the span size and length of the stope, a truss of appropriate length is selected, the cross-section of the truss is 20×20 cm, and the trusses are connected by screws to form a truss network 1;

[0031] S3, weld the truss net 1 and the anchor cable 4, and install multiple lifting rings on the bottom reinforcement of the truss net 1. The structure of the lifting ring is shown in FIG. Figure 5 The wire rope eyelet is composed of a rope body 10 with a length of 30 cm and a buckle 11. First, fix the wire rope into a ring shape, and then use the wire rope buckle to fix the two ends of the wire rope. The installation position of the eyelet can refer to the attached Figure 3 Each of the anchor cables 4 is provided with a lifting ring at the position corresponding to the welded truss net 1. The spacing of the lifting rings along the length direction of the approach is half of the spacing of the anchor cables. The installation spacing of the lifting rings along the direction of the ore body is 1.5m. A lifting ring is arranged at a distance of 20cm and 50cm from the upper and lower surrounding rocks. The lifting ring has two main functions. The first is to suspend the wire rope and the second is to install an electric rake on the lifting ring.

[0032] S4. After the installation of the lifting rings, concrete pouring is carried out. The strength of the concrete can be selected from C10 concrete or C20 concrete according to the service life of the false bottom. The thickness of the false bottom is 50 to 100 cm.

[0033] S5. After the first layer of false bottom is poured, the next layer can be mined, and after the mining is completed, the second layer of false bottom construction can begin.

[0034] S6, the lower false bottom is connected to the lifting ring of the upper false bottom through the steel wire rope 3, and the lower false bottom is suspended through the lifting ring of the upper false bottom; it should be noted that the steel wire rope 3 at the same node of the lower false bottom needs to be connected to multiple lifting rings of the upper false bottom to form a triangular support, which can be referred to Figure 1 and Figure 2 ; The subsequent false bottom construction refers to the above steps to complete the false bottom construction of all approaches.

[0035] For the ore body with broken upper and lower surrounding rocks, a method of constructing a concrete false bottom by wire rope suspension is proposed. First, the wire rope lifting ring in this scheme can not only suspend the false bottom, but also be used to install electric rakes, which provides convenience for mining; secondly, this method uses waste wire ropes for false bottom suspension, which reduces costs; finally, the use of wire ropes for false bottom suspension can improve the flexibility of false bottom suspension and the tensile strength of the overall structure due to the flexibility of wire ropes.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing an artificial false bottom with a truss-type steel wire rope suspension, characterized in that The steps include: S1. Drive multiple anchor cables into the surrounding rock of the upper and lower walls of the vein roadway above the stope at intervals, with the anchor cables partially exposed as a suspension structure for suspending the false bottom of the first layer; S2. According to the span size and length of the stope, select trusses of appropriate length to form a truss network, and connect the trusses with screws; S3, welding the truss net and the anchor cable, and installing a plurality of lifting rings on the bottom reinforcement of the truss net; S4. After the installation of the lifting rings, concrete pouring is carried out. The strength of the concrete can be selected according to the service life of the false bottom. After the pouring is completed, the concrete layer containing the truss mesh is the false bottom. S5. After the first layer of false bottom is poured, the next layer can be mined, and after the mining is completed, the next layer of false bottom construction can be started; S6. The lower false bottom is connected to the lifting ring of the upper false bottom through a steel wire rope, and the lower false bottom is suspended through the lifting ring of the upper false bottom; the subsequent false bottom construction refers to the above steps to complete the false bottom construction of all approaches.

2. A method for constructing an artificial false bottom with truss-type steel wire rope suspension according to claim 1, characterized in that: In step S1, the plurality of anchor cables are divided into two rows, each row comprising a plurality of anchor cables spaced apart along the length direction of the tunnel, the lower ends of the two rows of anchor cables being close to each other and the upper ends being far away from each other, forming an inverted figure eight shape.

3. A method for constructing an artificial false bottom with truss-type steel wire rope suspension according to claim 2, characterized in that: In step S3, the hanging ring includes a rope body and a buckle. The rope body is formed into a ring and fixed by the buckle to form a hanging ring.

4. A method for constructing an artificial false bottom with truss-type steel wire rope suspension according to claim 3, characterized in that: In step S3, the lifting rings are installed at intervals, and each anchor cable is provided with a lifting ring at a position of the truss welded corresponding to the anchor cable, and the spacing of the lifting rings along the length direction of the access route is half of the spacing of the anchor cables.

5. A method for constructing an artificial false bottom with truss-type steel wire rope suspension according to claim 4, characterized in that: In step S4, the strength of the concrete can be selected as C10 concrete or C20 concrete according to the service life of the false bottom, and the thickness of the false bottom is 50-100 cm.

6. A method for constructing an artificial false bottom with truss-type steel wire rope suspension according to claim 5, characterized in that: In step S6, the steel wire ropes at the same node of the lower false bottom need to be connected to multiple lifting rings of the upper false bottom to form a triangular support.

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