RU107281U1 - THREE-LINK METAL ARCH ARRESIBLE FASTENER "KMP-AZRZ" - Google Patents

Abstract

 A three-link metal arched ductile support containing interconnected frames (1), each of which contains an upper (2) made with curved middle and end parts, and two racks (3) made with curved upper and middle parts, as well as rectilinear lower parts, in which (3) curved upper parts are overlapped with the curved end parts of the upper (2) at the compliance nodes (4) and fastened with locks (5), characterized in that the length (Lвс) of the curved middle part of the upper (2) selected from conditions for ensuring the following ratio:! ! where Lвс - the length of the curved middle part of the upper (2), mm; ! Lв - the length of the scan of the upper (2), mm; ! k1 is the coefficient of proportionality, k1 = 0.4-0.6; ! the bending radius (Rвк) of the curved end part of the upper tower (2) is selected from the condition for ensuring the following relation:! ! where Rвк is the bending radius of the curved end part of the upper (2), mm; ! Rвс - bending radius of the curved middle part of the upper (2), mm; ! k2 is the coefficient of proportionality, k2 = 1.5-1.7; ! the bending radius (Rb) of the curvilinear upper part of the rack (3) is selected from the condition for ensuring the following relation:! ! where Rсв - bending radius of the curved upper part of the rack (3), mm; ! Rвк - bending radius of the curved end part of the upper (2), mm; ! k3 is the coefficient of proportionality, k3 = 0.9-1.0; ! the length (Lsv) of the curved upper part of the rack (3) is selected from the condition for ensuring the following relation:! ! where Lсв - the length of the curved upper part of the rack (3), mm; ! Lc is the rack sweep length (3), mm; ! k4 is the coefficient of proportionality, k4 = 0.3-0.4; ! the radius (Rcc) of the bend of the curved middle part of the rack (3) is selected

Description

The utility model relates to mining, in particular, to multi-link metal arched pliable supports of the KMP-A3P3 type and can be used to mount mine workings in various, including complex, geological conditions.

It is known that in difficult geological conditions, to maintain the mine workings of coal, mine and shale mines, as a rule, multi-link, mainly three-link, four-link and five-link, metal arched ductile supports are used.

Three-link metal arched ductile supports are used in mine workings with the expected displacement of roof rocks up to 300-400 mm.

Four-link and five-link metal arch compliant supports are used in mine workings with the expected displacement of roofing rocks from 400 mm to 1000 mm and more.

A multi-link metal arched pliable support (hereinafter a metal arched pliable support or support) usually contains interframe-connected frames, each of which contains an upper made curvilinear, and two racks made with curved upper and middle parts, as well as curvilinear or rectilinear lower parts, in which the curvilinear upper parts are overlapped with the curvilinear end parts of the upper unit at the compliance nodes and are fastened with locks so that the upper laid on the outside or inside of the racks.

In the first case, the upper covers the racks. This scheme of installation of the upper is the bearing, the most reliable and common. In the second case, the upper is fixed by a suspension scheme, that is, the racks cover the upper.

The displacement of the rock mass from the side of the roof of the mine is accompanied by the impact on the roof supports of the load (load), under the action of which at the nodes of compliance there is a mutual sliding of the mating links with a simultaneous change in the frame section.

During operation of the lining in a compliant mode under the influence of an increasing load and reaching a value exceeding the sliding friction force between the mating links in the compliance nodes, the upper frame, overcoming the working lining resistance, is shifted down relative to the uprights.

At the same time, in the process of sagging of the upper frame under load, the lap length in the compliance nodes increases and the working resistance of the lining increases proportionally.

However, in accordance with the requirements for a flexible lining, the mutual sliding of the frame links in a compliant mode should preferably be carried out with a stable (constant) working resistance of the lining in the range of structural flexibility.

This is advisable both in the initial period of operation of the lining after construction in the mine, and during its long-term operation in a compliant mode.

Only in this case, the metal arched ductile support can be used with maximum efficiency, since its strength characteristics will be fully realized over the entire range of structural compliance.

The most widely used in mining are three-link metal arched flexible supports, which are characterized by a minimum number of links, low metal consumption, laboriousness and manufacturing and installation costs, and also have sufficient bearing capacity, the required value of working resistance under load and a satisfactory cross-sectional area, which ensures necessary internal space to accommodate personnel and equipment inside the lining.

The prior art three-link metal arched ductile supports, which have found application in the mining industry, which include the following supports.

Known three-link metal arched pliable support, containing interconnected frames, each of which contains an upper, made curved, and two racks made with curved upper parts, as well as with straight lower parts, in which the curved upper parts are overlapped with curved end parts upper nodes in ductility nodes and are fastened with locks ["Arochno is malleable hinges of a cottage gyro" UA 18737 (C2) (Shmigol A.V., Kirichenko V.Ya.) E21D 11/14, E21D 11/18, 12/25/1997, analogue] [ one].

In this lining, the radius of the curvilinear upper parts of the racks is: R = K · Q · R _B , where K is the proportionality coefficient, K = 0.9-1.1; Q - rack curvature coefficient, Q = 1.272; R _B is the radius of the upper shaft, mm, the angle of inclination of the rectilinear lower parts of the uprights to the vertical axis of the lining is β = 7-11º, and the length of the rectilinear lower parts of the uprights is: L = K · L ₀ , where K is a coefficient that takes into account the complexity of the operating conditions lash; K = 1.2-1.5; L ₀ - the estimated nominal length of the rectilinear lower part of the rack typical lining, mm.

However, the known lining [1] does not have a high bearing capacity, due to the fact that the rectilinear lower parts of the uprights have a significant length, which reduces their longitudinal stability under the action of axial loads, and also reduces the strength of the elongated rectilinear lower parts under the action of lateral and oblique loads .

Known three-link metal arched ductile support containing interconnected frames, each of which contains the upper, made curved, and two racks made with curved upper and lower parts, in which the curved upper parts are overlapped with the curved end parts of the upper in the nodes of compliance and fastened with locks [“Arochna is malleable to metal hinges of a tiled wardrobe” UA 41843 (A) (Halimendik Yu.M.) E21D 11/14, 09/17/2001, analogue] [2].

In this lining [2], the racks and the upper are made with a special profile bend towards the mountain massif, with a slope of the tangent at the interface between the racks and the sole of the mine in the direction of the mine.

The disadvantages of the known lining should be attributed to the shortened length of the curved upper, which reduces the amount of structural flexibility and limits its use in mine workings with a significant displacement of rocks from the roof.

Known three-link metal arched pliable support containing interconnected frames, each of which contains the upper, made curved, and two racks made with curved upper parts, as well as with straight curved lower parts, in which the curved upper parts are lapped with curved end parts of the upper part at the nodes of compliance and are fastened with locks [“Trilankov’s metal frame is flexible” UA 529162 (U) (ВАТ “Donetsk Experimental Repair and Mechanical Plant”) E21D 11/14, E21D 11/18, 10.01.2008, analogue] [3].

In this lining, the upper is made with a radius of curvature due to the ratio R ₁ = k ₁ · R ₂ , where k ₁ is the coefficient of optimization of the radius of curvature of the connected sections of the upper and struts, which is 0.76-1.0 with external installation of racks, 1, 0-1.3 - for internal installation of racks; R ₁ is the radius of the curved upper, mm; R ₂ is the radius of the upper curved end portion of the rack, mm

In addition, the length of the lap L at the nodes of compliance is determined by the formula: L = l ₁ + l ₂ , where: l ₁ - the constant part of the inlet, mm; l ₂ - the free part of the lap, mm; while the lower straight sections of the racks are installed at an angle of 3-7º to the axis of symmetry, which is in the vertical plane.

This lining [3] has a large cross-section for convenient placement of personnel and equipment inside the lining and a high amount of structural flexibility, however, it is characterized by insufficient bearing capacity due to the elongated straight inclined lower parts of the racks.

Known three-link metal arched pliable support containing interconnected frames, each of which contains an upper, made curved, and two racks made with curved upper parts, as well as with straight vertical lower parts, in which the curved upper parts are overlapped with curved end parts of the upper part in ductility nodes and are fastened with locks [“Metal arching ductile” UA 10268 (U) (State Research Institute of Mine Organization and Mine Engineering buddies) E21D 11/14, 11/15/2005, analogue] [4].

In this lining, the racks are made with vertical lower parts with the possibility of closing their ends after settling, while the length of the section of the upper part of each riser between its upper end and the corresponding lock is determined by the ratio:

where: L is the length of the section of the upper part of the rack between its end and the corresponding lock;

r is the inner radius of the upper;

B is the width of the arch mount near the base of the rack;

h _c - the height of the rectilinear bottom of the rack;

R is the inner radius of the curved upper part of the rack;

β is the central angle of the curved top of the rack;

_F h - the height of the flange verhnyaka special profile and risers;

η - the angle of inclination of the rectilinear lower part of the rack to the vertical axis of the mount after its subsidence;

φ is the angle between the rectilinear lower part of the rack and the chord, which connects the upper and lower ends of the rack;

π = 3.14.

This lining [4] as well as the known lining [3] has a large cross-section, which is necessary for personnel to work and place the equipment inside the lining and a high amount of structural flexibility, however, it is characterized by insufficient bearing capacity due to the elongated rectilinear vertical lower parts of the racks.

Known three-link metal arched ductile support containing interconnected frames, each of which contains the upper, made curved, and two racks made with curved upper and lower parts, in which the curved upper parts are overlapped with the curved end parts of the upper in the nodes of compliance and fastened with locks [“Metal is more flexible” UA 52340 C2 (Sugarenko GG, Kirichenko V.Ya., Kulikovich OM, Gural VV, Mazur VD) E21D 11/14, E21D 11 / 18, January 17, 2005, analogue] [5].

In this lining [5], the racks and the associated end parts of the upper part of each frame are made in the form of arcs L ₁ , L _{2 of the} same curvature, the radii R _{1 of} curvature of which are equal to the width A of the frame near the sole, and their centers O ₁ are located in the plane of the base of the frame and the middle part of the upper is made in the form of an arc L ₃ , the radius of R _{2 of} curvature of which is less than the radii R _{1 of} curvature of the arches L _{2 of} its final parts, and is equal to: R ₂ = A-0.5 · A · tgα, where A - the width of the frame near the sole, m; α is the angle between the plane of the bottom of the frame and the straight line, which passes through the center O _{1 of} radius R ₁ of the column curvature or the end part of the upper shaft connected to it, and the junction point of arcs of different radii of the upper frame curvature R ₁ , R ₂ ; α = 20-50º, and its center O ₂ is located in the plane of symmetry of the frame.

This lining [5] has a sufficiently high bearing capacity and the magnitude of structural flexibility, however, it is characterized by a small cross section, which reduces the internal space and limits the conditions for the placement of personnel and equipment inside the lining due to insufficient distance between the bases of the racks at the bottom of the mine.

Known closest to the claimed by the number of common features and the achieved result is a three-link metal arch compliant support containing interconnected frames, each of which contains an upper made with curved middle and end parts, and two racks made with curved upper and middle parts, as well as rectilinear lower parts, in which the curvilinear upper parts are overlapped with the curved end parts of the upper part at the compliance nodes and are fastened with locks [" Compliant metal arch support "RU 2029871 (C1) (Makarov VP) E21D 11/14, 02/27/1995, the closest analogue prototype] [6].

However, this lining [6] does not have the best combination of geometrical characteristics of the upper and racks, as a result of which the optimal ratio of its main characteristics such as: bearing capacity, structural compliance, stability of the lining working resistance in the range of structural compliance, cross-section of the inner lining the cavity while maintaining minimal metal consumption, as well as the cost of manufacturing and installation.

When developing designs for modern roof supports, the main prerequisite for increasing the performance of a metal arch compliant roof support is to increase its ultimate bearing capacity, as a necessary condition for a corresponding increase in working resistance, determining the moment of the onset of the final balance of the roof support array system, and thereby, the effectiveness of the roof support in general.

One of the ways is to increase the ultimate bearing capacity in an extensive way, that is, by increasing the mass of the material, the density and metal consumption of the fastener.

The most rational is an intensive way to improve the support, aimed at changing the shape of the cross section, without significantly changing its metal consumption, but providing an increase in working capacity, including an increase in structural compliance, which for three-link supports is usually limited to 300-400 mm.

By optimizing the radii of the end sections of the mating segments - the upper and supports, the support can be increased by 150-250 mm, as well as its stability with respect to both axial loads and lateral and oblique loads.

The technical problem to which the utility model is directed is to improve the basic geometric parameters of the lining by choosing the optimal combination of the length (Lвс) of the curved middle part of the upper and the radius (Rвк) of the bend of the curved end part of the upper, and also the choice of the best combination of the radius (Rв) of the curved bend the upper part of the rack, the length (Lсв) of the curved upper part of the rack, the radius (Rcc) of the bend of the curved middle part of the rack, the length (Lcc) of the bend of the curved middle part of the rack, length (Lсн) the rectilinear lower part of the rack and the angle (βсн) of the inclination of the rectilinear lower part of the rack to the vertical.

The improvement of the lining is mainly aimed at improving the shape of the cross section as a whole and the shape of the forming segments - the upper and racks in the direction of maximally approximating their shape to the pressure curve and reducing bending radii at critical areas of application of external loading forces.

The technical result that is achieved by solving the problem and using the improved lining is to ensure an optimal and balanced ratio of its main characteristics such as: ultimate bearing capacity, the value of structural compliance, the stability of the lining resistance in the range of structural compliance, a sufficiently large cross-section of the lining for normal and safe work of personnel and placement of equipment inside the lining while ensuring mini low metal consumption, as well as reducing the cost of manufacturing and installation.

The stated technical problem is solved, and the expected technical result is achieved by the fact that in a three-link metal arch compliant lining containing interconnected frames, each of which contains an upper made with curved middle and end parts, and two racks made with curved upper and middle parts, as well as rectilinear lower parts, in which the curvilinear upper parts are overlapped with the curved end parts of the upper part in the compliance nodes and fastened to locks and, according to the utility model, the length (Lвс) of the curved middle part of the upper is selected from the condition for ensuring the following ratio:

where: Lвс - the length of the curved middle part of the upper, mm;

Lв - scan length of the upper, mm;

k ₁ - coefficient of proportionality; k ₁ = 0.4-0.6;

the radius (Rвк) of the bend of the curved end part of the upper is selected from the condition of ensuring the following ratio:

where: Rвк - bending radius of the curved end part of the upper tower, mm;

Rвс - bending radius of the curved middle part of the upper, mm;

k ₂ is the coefficient of proportionality; k ₂ = 1.5-1.7;

the radius (Rsv) of the bend of the curved upper part of the rack is selected from the condition for ensuring the following ratio:

where: Rсв - bending radius of the curved upper part of the rack, mm;

Rвк - bending radius of the curved end part of the upper tower, mm;

k ₃ is the coefficient of proportionality; k ₃ = 0.9-1.0;

the length (Lsv) of the curved upper part of the rack is selected from the condition for ensuring the following ratio:

where: Lсв - the length of the curved upper part of the rack, mm;

Lc - rack scan length, mm;

k ₄ - coefficient of proportionality; k ₄ = 0.3-0.4;

the radius (Rcc) of the bend of the curved middle part of the rack is selected from the condition for ensuring the following ratio:

where: Rcc is the bending radius of the curved middle part of the rack, mm;

Rсв - bending radius of the curved upper part of the rack, mm;

k ₅ is the coefficient of proportionality; k ₅ = 1.1-1.3;

the length (Lcc) of the bend of the curved middle part of the rack is selected from the condition for ensuring the following ratio:

where: Lcc - the length of the bend of the curved middle part of the rack, mm;

Lc is the rack sweep length (3), mm;

k ₆ is the coefficient of proportionality; k ₆ = 0.2-0.35;

the length (Lсн) of the rectilinear lower part of the rack is selected from the condition for ensuring the following ratio:

where: Lсн - the length of the rectilinear lower part of the rack, mm;

Lc - rack scan length, mm;

K ₇ is the coefficient of proportionality; k ₇ = 0.1-0.3;

and the angle (βsn) of the inclination of the rectilinear lower part of the rack to the vertical is selected from the condition for ensuring the following expression:

where: βсн - the angle of inclination of the rectilinear lower part of the rack to the vertical, degrees, º.

The selected relations (1-7) and expression (8), as well as proportionality coefficients (k ₁ -k ₇ ) are determined empirically, are optimal and form the best balanced combination of basic geometric parameters and the best form of lining.

This provides the most rational correlations of its basic characteristics such as: bearing capacity, magnitude of structural compliance, stability of the working resistance of the lining in the range of constructive flexibility, a sufficiently large cross-section of the lining for normal operation of the lining and placement of equipment inside the lining while ensuring minimal metal consumption, as well as cost. manufacturing and installation.

By optimizing the geometric parameters of the lining, including the radii of the end sections, mating segments (upper and struts), compliance is increased by 150-250 mm, as well as the stability of the lining in relation to both axial loads and lateral and oblique loads .

The choice of proportionality coefficients (k ₁ -k ₇ ) outside the specified minimum and maximum values violates this optimal ratio of the main geometric parameters of the lining and leads to a violation of the balanced ratio of strength indicators, ductility and working resistance characteristics, as well as its cross-sectional area.

So the choice of the values of the proportionality coefficients (k ₁ -k ₇ ), at which the bearing capacity, the amount of constructive compliance, the stability of the value of the working resistance increases, reduces the cross-section of the lining, which worsens the conditions and safety of personnel, and also limits the placement of mining equipment inside the lining.

And vice versa, the choice of the values of the proportionality coefficients (k ₁ -k ₇ ), at which the dimensions and the cross-sectional area of the lining are increased, leads to a decrease in strength indicators and characteristics of the value of structural flexibility and stability of the working resistance.

In the future, the utility model is illustrated by the drawing, which depicts a three-link metal arched ductile lining, and an example of its implementation with reference to the aforementioned drawing.

The three-link metal arch compliant support (see drawing) contains interconnected frames 1, each of which contains an upper 2, made with curved middle and end parts, and two racks 3, made with curved upper and middle parts, as well as with straight lower parts in which (3) the curvilinear upper parts are overlapped with the curved end parts of the upper 2 at ductility nodes 4 and fastened with locks 5.

The peculiarity of the lining are the following improvements in its geometric characteristics.

The length (Lвс) of the curved middle part of the upper (2) is selected from the condition for ensuring the following ratio:

where: Lвс - the length of the curved middle part of the upper (2), mm;

Lв - the length of the scan of the upper (2), mm;

k ₁ - coefficient of proportionality; k ₁ = 0.4-0.6.

The bending radius (Rвк) of the curved end part of the upper (2) is selected from the condition for ensuring the following ratio:

where: Rвк - bending radius of the curved end part of the upper (2), mm;

Rвс - bending radius of the curved middle part of the upper (2), mm;

k ₂ is the coefficient of proportionality; k ₂ = 1.5-1.7.

The bending radius (Rsv) of the curved upper part of the rack (3) is selected from the condition for ensuring the following ratio:

where: Rсв - bending radius of the curved upper part of the rack (3), mm;

Rвк - bending radius of the curved end part of the upper (2), mm;

k ₃ is the coefficient of proportionality; k ₃ = 0.9-1.0.

The length (Lsv) of the curvilinear upper part of the rack (3) is selected from the condition for ensuring the following ratio:

where: Lсв - the length of the curved upper part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

k ₄ - coefficient of proportionality; k ₄ = 0.3-0.4.

The bending radius (Rcc) of the curved middle part of the strut (3) is selected from the condition for ensuring the following ratio:

where: Rcc is the bending radius of the curved middle part of the rack (3), mm;

Rсв - bending radius of the curvilinear upper part of the rack (3), mm;

k ₅ is the coefficient of proportionality; k ₅ = 1.1-1.3.

The length (Lcc) of the bend of the curved middle part of the rack (3) is selected from the condition for ensuring the following ratio:

where: Lcc - the length of the bend of the curved middle part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

k ₆ is the coefficient of proportionality; k ₆ = 0.2-0.35.

The length (Lсн) of the rectilinear lower part of the rack (3) is selected from the condition for ensuring the following ratio:

where: Lсн - the length of the rectilinear lower part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

k ₇ is the coefficient of proportionality; k ₇ = 0.1-0.3.

The angle (βсн) of the inclination of the rectilinear lower part of the rack (3) to the vertical is selected from the condition for ensuring the following expression:

where: βсн - the angle of inclination of the rectilinear lower part of the rack (3) to the vertical, degrees, º.

Three-link metal arched pliable support is constructed as follows.

When erecting the lining, the frames 1 are first mounted.

For this, the upper 2 of each frame 1, in which the length (Lвс) of the curved middle part is selected from the expression (1), with their curved end parts, the bending radius (Rвк) of which is selected from the expression (2), are jointed from the outside with an overlap with the curved upper parts of the uprights 3, in which the bending radius (Rb) of the upper parts is selected from relation (3), the length (Lc) of the curved upper parts is selected from (4), the bending radius (Rcc) of the curved middle parts is selected from (5), the length (Lcc ) the bending of the curved middle parts is selected from the ratio (6), the length (Lsn) straight lower portions selected from (7) and the angle (βsn) tilt rectilinear lower portions to the vertical is selected from the expression (8).

The curved end parts of the upper 2 are lapped with the curved upper parts of the uprights 3 in the nodes of compliance 4 and fastened with locks 5.

The mounted frames 1 are fastened along the mine working by interframe ties (not shown in the drawing) into a three-link metal arched pliable support.

The curved end parts of the upper 2, overlapped with the curved upper parts of the uprights 3 in the nodes of flexibility 4, compress the locks 5 with a certain force, the maximum value of which depends on the design features and the capabilities of the locks themselves.

Three-link metal arched pliable support works as follows.

In the process of formation of a zone of inelastic deformations around the mine working out on the side of the massif, a comprehensive external compression of the supports occurs with the disturbed rocks of the massif.

With a comprehensive compression of the metal arch compliant roof support in the locks 5 of the compliance nodes 4, the curved end parts of the upper parts 2 slide relative to the overlapped curved upper parts of the uprights 3 in the compliance nodes 4 with a simultaneous change in the cross section of the frames 1.

The sliding of the curved end parts of the upper 2, relative to the overlapped curved upper parts of the uprights 3 in the nodes of flexibility 4 depends on the working characteristics of the grooved special profiles and is due to the shape of their cross section and material.

In this case, the locks of 5 nodes of flexibility 4 lining ensure their tight fit along the entire length of the lap and the creation of stable friction forces between them, which ensures the stabilization of the parameters of the working resistance of the nodes of compliance in the range of structural flexibility of the lining due to the fact that the radius (Rb) of the bending of the curvilinear upper parts of racks (3) is selected from the condition for ensuring the following ratio:

where: Rсв - bending radius of the curved upper part of the rack (3), mm;

Rвк - bending radius of the curved end part of the upper (2), mm;

k ₃ is the coefficient of proportionality; k ₃ = 0.9-1.0;

Due to this, in the nodes of flexibility 4 of each frame 1, during the lining loading, the friction forces between the curved end parts of the upper 2 and the curved upper parts of the uprights 3 do not create a sawtooth, but gradually increasing characteristic of the working resistance, and when the geomechanical equilibrium of the lining - array system is reached provide a stable design value of the working resistance.

In this case, the deviations of the working resistance of the lining from the design value do not exceed the permissible ± 10-12%.

When the rock pressure exceeds the resistance of the lining support, the curved end parts of the upper 2 and the curved upper parts of the uprights 3, fastened with locks 5 at the nodes of flexibility 4, slide relative to each other under the influence of the massif of rocks, resulting in a change in the geometry and cross-section of the frames 1 .

The established geomechanical balance of the lining-array system is ensured by the friction forces of the contact surfaces of the curved end parts of the upper 2 and the curved upper parts of the uprights 3, that is, the resistance forces in the compliance nodes 4 created by the locks 5.

During the period of loading the lining, the mutual sliding of the curved end parts of the upper 2 and the curved upper parts of the racks 3 in compliant mode is carried out with a stable value of the working resistance, which is required for the normal operation of the flexible lining.

In the subsequent period of operation of the lining in a compliant mode with a rock pressure exceeding the lining compliance resistance at an intermediate geomechanical equilibrium of the lining-mass system, under the action of further displacement of the rock mass, the process of smooth sliding of the curved end parts of the upper 2 relative to the curved upper parts of the uprights 3, fastened locks 5 in the nodes of compliance 4, is constantly repeated.

This happens until the final geomechanical equilibrium of the lining-mass system is established in a new state, up to the exhaustion of the entire value of the structural compliance of the lining.

After exhausting the entire value of the structural compliance of the lining, its cross-section reaches the minimum value and the lining goes into hard operation.

But the metal arched pliable support to this state, usually, is not brought

The selected relations (1-7) and expression (8), as well as proportionality coefficients (k ₁ -k ₇ ) form the optimal combination of basic geometric parameters and the best form of lining, providing the most rational ratio of its basic characteristics such as: bearing capacity, structural value compliance, stability of the lining working resistance in the range of structural compliance, a sufficiently large cross-section of the lining frames for normal and safe work of personnel and equipment placement tions inside lining while ensuring the minimum of metal, as well as manufacturing and installation costs.

By optimizing the geometric parameters of the lining, including the radii of the end sections of the mating segments (upper and struts), the suppleness of the lining increases by 150-250 mm, as well as its stability with respect to both axial loads and lateral and oblique loads.

The above information confirms the possibility of industrial applicability of the inventive three-link metal arched pliable support, which can be manufactured at any mining engineering enterprise and can be widely used in the mining industry for fixing mine workings in various, including complex, geological conditions.

Notation list

1. frame

2. upper

3.stand

4. Compliance knot

5. castle

Lвс - the length of the curved middle part of the upper (2), mm;

Lв - the length of the scan of the upper (2), mm;

k ₁ - coefficient of proportionality; k ₁ = 0.4-0.6;

Rвк - bending radius of the curved end part of the upper (2), mm;

Rвс - bending radius of the curved middle part of the upper (2), mm;

k ₂ is the coefficient of proportionality; k ₂ = 1.5-1.7;

Rсв - bending radius of the curvilinear upper part of the rack (3), mm;

Rвк - bending radius of the curved end part of the upper (2), mm;

k ₃ is the coefficient of proportionality; k ₃ = 0.9-1.0;

Lсв - the length of the curved upper part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

k ₄ - coefficient of proportionality; k ₄ = 0.3-0.4;

Rcc is the bending radius of the curved middle part of the rack (3), mm;

Rсв - bending radius of the curvilinear upper part of the rack (3), mm;

K ₅ - coefficient of proportionality; k ₅ = 1.1-1.3;

Lcc - bending length of the curved middle part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

k ₆ is the coefficient of proportionality; k ₆ = 0.2-0.35;

Lсн - the length of the rectilinear lower part of the rack (3), mm;

Lc is the rack sweep length (3), mm;

K ₇ is the coefficient of proportionality; k ₇ = 0.1-0.3;

βсн - the angle of inclination of the rectilinear lower part of the rack (3) to the vertical, degrees, º.

βсн = 4-7º.

Claims (1)

A three-link metal arched ductile support containing interconnected frames (1), each of which contains an upper (2) made with curved middle and end parts, and two racks (3) made with curved upper and middle parts, as well as rectilinear lower parts, in which (3) curved upper parts are overlapped with the curved end parts of the upper (2) at the compliance nodes (4) and fastened with locks (5), characterized in that the length (Lвс) of the curved middle part of the upper (2) selected from conditions for ensuring the following ratio:

where Lвс - the length of the curved middle part of the upper (2), mm; Lв - the length of the scan of the upper (2), mm; k ₁ - coefficient of proportionality, k ₁ = 0.4-0.6; the radius (Rвк) of the bend of the curved end part of the upper (2) is selected from the condition for ensuring the following ratio:

where Rвк is the bending radius of the curved end part of the upper (2), mm; Rвс - bending radius of the curved middle part of the upper (2), mm; k ₂ is the coefficient of proportionality, k ₂ = 1.5-1.7; the radius (Rb) of the bend of the curvilinear upper part of the rack (3) is selected from the condition for ensuring the following ratio:

where Rсв - bending radius of the curved upper part of the rack (3), mm; Rвк - bending radius of the curved end part of the upper (2), mm; k ₃ is the proportionality coefficient, k ₃ = 0.9-1.0; the length (Lsv) of the curved upper part of the rack (3) is selected from the condition for ensuring the following ratio:

where Lсв - the length of the curved upper part of the rack (3), mm; Lc is the rack sweep length (3), mm; k ₄ is the coefficient of proportionality, k ₄ = 0.3-0.4; the radius (Rcc) of the bend of the curved middle part of the rack (3) is selected from the condition for ensuring the following ratio:

where Rcc is the bending radius of the curved middle part of the rack (3), mm; Rсв - bending radius of the curvilinear upper part of the rack (3), mm; K ₅ is the coefficient of proportionality, k ₅ = 1.1-1.3; the length (Lcc) of the bend of the curved middle part of the rack (3) is selected from the condition of ensuring the following ratio:

where Lcc is the bending length of the curved middle part of the rack (3), mm; Lc is the rack sweep length (3), mm; k ₆ is the coefficient of proportionality, k ₆ = 0.2-0.35; the length (Lсн) of the rectilinear lower part of the rack (3) is selected from the condition for ensuring the following ratio:

where Lсн - the length of the rectilinear lower part of the rack (3), mm; Lc is the rack sweep length (3), mm; K ₇ is the coefficient of proportionality, k ₇ = 0.1-0.3; and the angle (βсн) of the inclination of the rectilinear lower part of the rack (3) to the vertical is selected from the condition for ensuring the following expression:

where βсн - the angle of inclination of the rectilinear lower part of the rack (3) to the vertical, deg.