A mine extensible prop, a support system and a construction process

Abstract

The present invention discloses a mine extensible prop, a support system and a construction process. In the first aspect, a mine extensible prop includes a lower column body, an upper column body and a sleeve. The upper section of the lower column body is sleeved inside the lower end of the sleeve, and the lower section of the upper column body is sleeved inside the upper section of the sleeve. A first fixing ring is provided on the sleeve, and a second fixing ring is provided on the upper column body or the lower column body. It further includes an adjusting lead screw passing through the first fixing ring and the second fixing ring. At least one adjusting nut is provided on the adjusting lead screw. The lower column body or the upper column body away from the second fixing ring is fixedly connected to the sleeve. In the second aspect, a mine extensible support system includes at least two of the above-mentioned mine extensible props. Connection noses are provided on both sides of the upper column body and / or the lower column body and / or the sleeve. Bolt holes are provided on the connection noses. In the third aspect, a construction process of a mine extensible support system. The present invention can adapt to the height change of the roadway, has high support strength, strong anti-deformation ability, and reduces material waste.

Description

Technical Field

[0001] The present invention relates to the technical field of support products for mines, and particularly relates to a mine extensible prop, a support system and a construction process. Background Art

[0002] At present, in order to improve the roadway driving speed and ensure the coal mining succession, many coal mines now adopt the gob-side entry retaining method to reduce roadway driving. However, the caving gangue on the gob side of the gob-side entry retaining has a great impact on the roadway side support such as U-shaped steel and single hydraulic props. Due to the small lateral pressure resistance of U-shaped steel and single hydraulic props, there are many bends and fractures in U-shaped steel, single hydraulic props, etc. Especially in the roadway with a large mining height, the problem is even more serious. Some mines also adopt the method of formwork pouring concrete to support the gob side, but the efficiency is low, the material consumption is large, the construction is inconvenient, and it cannot be recycled later. The non-roof-falling of the roadway causes great potential safety hazards. Now there is an urgent need for a support product to solve the above problems safely and efficiently. Summary of the Invention

[0003] The purpose of the present invention is to provide a mine extensible prop, a support system and a construction process, which can adapt to the height change of the roadway, have high support strength, strong anti-deformation ability, and reduce material waste.

[0004] To solve the above technical problems, the present invention adopts the following solutions:

[0005] In the first aspect, a mine extensible prop includes a lower column body, and further includes an upper column body and a sleeve. The upper section of the lower column body is sleeved inside the lower section of the sleeve, and the lower section of the upper column body is sleeved inside the upper section of the sleeve. A first fixing ring is provided on the sleeve, a second fixing ring is provided on the upper column body or the lower column body, and an adjusting screw rod passing through the first fixing ring and the second fixing ring is further included. At least one adjusting nut is provided on the adjusting screw rod. The lower column body or the upper column body away from the second fixing ring is fixedly connected to the sleeve. Adjusting nuts can be provided on both sides of the second fixing ring and both sides of the first fixing ring. If the adjusting screw rod is provided with a limiting end face, adjusting nuts are provided on both sides of the second fixing ring and on the side of the first fixing ring away from the limiting end face. Its function is to adjust and lock the distance between the first fixing ring and the second fixing ring by adjusting the position of the adjusting nut on the adjusting screw rod, so as to achieve the effect of adjusting and locking the total length of the prop. The lower column body, the sleeve and the upper column body form a first force-bearing component, and the first fixing ring, the second fixing ring, the adjusting screw rod and the adjusting nut form a second force-bearing component. The first force-bearing component and the second force-bearing component are stressed in parallel. During the assembly process, the second force-bearing component plays a role in adjusting and locking the length of the first force-bearing component and temporarily bearing the force for support. After grouting into the first force-bearing component during the assembly and the slurry solidifies in the first force-bearing component, the first force-bearing component plays the main role in bearing the force, the force on the second force-bearing component becomes smaller, and the service life of the second force-bearing component is extended.

[0006] Furthermore, the lower cylinder is provided with grouting holes, the top end of the upper cylinder is provided with slurry overflow holes, and at least one end of the casing is provided with strengthening hoops. Their functions are as follows: the grouting holes are used for grouting into the support column; the slurry overflow holes are used to judge whether the grouting is completed; and the strengthening hoops are used to further increase the strength of the casing.

[0007] Furthermore, a steel sleeve is fixedly connected to the upper part of the upper cylinder opposite to the adjusting lead screw. A pin is provided at the lower end of the steel sleeve, and a round steel is sleeved inside the steel sleeve. Its function is that after the support column is assembled and erected, by inserting the round steel into the borehole in the roof, the support column can stand stably.

[0008] Furthermore, both the upper cylinder and the lower cylinder are hollow cylinders. A sheath is sleeved on the lower end of the upper cylinder provided with a second fixing ring or the upper end of the lower cylinder provided with a second fixing ring. Through holes are provided on the end face of the sheath. Its function is to enable the slurry to be injected into the casing and the upper cylinder through the lower cylinder.

[0009] Furthermore, the sheath is in a column shape, made of NBR material. The thickness of the side wall of the sheath matches the gap between the upper cylinder or the lower cylinder sleeved with the sheath and the casing. The ratio of the inner diameter of the through hole to the inner diameter of the upper cylinder or the lower cylinder where the sheath is located is between 1:2 and 1:30. Its functions are as follows: during grouting, it can play a sealing role to prevent slurry leakage; because the sheath is made of NBR material and has weak adhesiveness to the slurry, after the slurry solidifies, it is convenient to separate the solidified matter near the through hole in the later stage, facilitating the recovery of the support column and reducing material waste.

[0010] Furthermore, a lower plate is fixedly provided at the bottom end of the lower cylinder. Ground threaded holes are provided at both ends of the lower plate. A lower connecting plate is provided above the lower plate. At least one lower connecting plate through slot is provided on the lower connecting plate. It also includes ground bolts matching the ground threaded holes. The ground bolts pass through the lower connecting plate through slot and are connected to the ground threaded holes. Ground anchor holes for installing ground anchors are provided on the lower connecting plate. Its function is to fix the support column on the roadway ground. An upper plate is fixedly provided at the top end of the upper cylinder. An upper connecting plate is provided below the upper plate. Bolt holes for installing bolts are provided on the upper connecting plate. Its function is to fix the support column on the roadway roof.

[0011] In a second aspect, a mine-use telescopic support system includes at least two of the above-mentioned mine-use telescopic support columns. Connecting noses are provided on both sides of the upper cylinder and / or the lower cylinder and / or the casing. Bolt holes are provided on the connecting noses. It also includes a connecting plate. Two connecting plate through slots are provided on the connecting plate. The two connecting plate through slots respectively correspond to the bolt holes on two adjacent connecting noses of two adjacent mine-use telescopic support columns. It also includes at least two bolts corresponding to the bolt holes. The bolts pass through the connecting plate through slots and are connected to the bolt holes. Its function is to adapt to the error change in the distance between the support columns and improve the anti-deformation ability of the support system at the same time.

[0012] Furthermore, the lower connecting plate is provided with two lower connecting plate through grooves, which respectively correspond to the ground threaded holes adjacent to the lower plates on two adjacent mine extensible supports. Both sides of the lower connecting plate are in contact with the upper surfaces of the lower plates on two adjacent mine extensible supports, and both sides of the upper connecting plate are in contact with the lower surfaces of the upper plates on two adjacent mine extensible supports.

[0013] Thirdly, a construction process of a mine extensible support system includes the following steps:

[0014] S1: After inserting the lower section of the upper column body without the second fixing ring or the upper section of the lower column body without the second fixing ring into the sleeve, fix the lower section of the upper column body or the upper section of the lower column body to the sleeve, and then insert the other column body with the second fixing ring into the other end of the sleeve;

[0015] S2: Pass the adjusting lead screw through the first fixing ring and the second fixing ring, adjust and lock the length of the support by adjusting the position of the adjusting nut. After reaching the required length, stand the support upright;

[0016] Furthermore, it also includes the following steps:

[0017] S0: Before inserting the lower section of the upper column body with the second fixing ring or the upper section of the lower column body with the second fixing ring into the sleeve, sleeve the protective sheath on the lower end of the upper column body with the second fixing ring or the upper end of the lower column body with the second fixing ring;

[0018] Sm: Pass the round steel through the steel sleeve and insert it into the pre-drilled roof hole, and use a pin to lock the round steel to prevent it from falling, so that the support can stand stably. Pass the anchor bolt through the anchor bolt hole on the upper connecting plate, and then install the anchor bolt into the pre-drilled roof anchor bolt hole and fix it with a nut. Press the upper connecting plate against the upper plates of two adjacent supports, so that the upper connecting plate is fixed by the anchor bolt;

[0019] Sn: After pressing the lower connecting plate against the lower plates of two adjacent supports, connect the ground bolt through the lower connecting plate through groove and the ground threaded hole, then pass the ground anchor through the ground anchor hole and install it into the pre-drilled floor hole and fix it with a nut, so that the lower connecting plate is fixed by the ground anchor;

[0020] So: Pass the bolt through the connecting plate through groove and connect it with the bolt hole, and tighten the bolt to fix the connecting plate on the two adjacent connecting noses adjacent to the supports;

[0021] Sp: After the support is fixedly installed, grout the support through the grouting hole. When the slurry flows out from the slurry overflow hole, it indicates that the inner cavity of the support is full, and stop grouting;

[0022] Se: When the pillar is no longer in use, take out the bolts on the connecting plate, remove the connecting plate, remove the nuts on the anchor rod and the ground anchor, take out the lower connecting plate and the upper connecting plate, take out the pins, remove the round steel, lay down the pillar, rotate the upper column or lower column with the sleeve, separate the casing and its fixedly connected lower column or upper column from the upper column or lower column with the sleeve into two sections for recycling.

[0023] The present invention has the beneficial effects:

[0024] 1. By adjusting the setting of the lead screw, the height of the pillar can be adjusted to adapt to the height change of the lane;

[0025] 2. Through the setting of grouting holes and overflow holes and the hollow structure of the upper column and the lower column, grouting can be injected into the pillar to further improve the supporting strength of the pillar;

[0026] 3. The setting of connecting plates, lower connecting plates, connecting plate slots and lower connecting plate slots can adapt to the error changes in the spacing between pillars and improve the deformation resistance of the support system;

[0027] 4. The setting of the sheath makes it easier to recycle the column later and reduce material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the front view structure of a telescopic support for mining;

[0029] Figure 2 It is a schematic diagram of the front view and cross-section structure of a telescopic support for mining;

[0030] Figure 3 It is a left-side structural schematic diagram of a telescopic support for mining;

[0031] Figure 4 It is a rear view structural schematic diagram of a retractable support for mining;

[0032] Figure 5 It is a schematic diagram of the front view structure of a retractable support system for mining.

[0033] The accompanying drawings are marked as follows: 1. lower column; 2. upper column; 3. casing; 3a. reinforcement hoop; 4. first fixing ring; 5. second fixing ring; 6. adjusting screw; 7. adjusting nut; 8. sheath; 9. through hole; 10. grouting hole; 11. overflow hole; 12. lower plate; 13. ground threaded hole; 14. lower connecting plate; 15. lower connecting plate through groove; 16. ground bolt; 17. ground anchor hole; 18. upper plate; 19. upper connecting plate; 20. anchor eye; 21. connecting nose; 22. bolt hole; 23. connecting plate; 24. connecting plate through groove; 25. bolt; 26. steel sleeve; 27. pin; 28. round steel. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] Embodiment 1

[0038] In a first aspect, as Figure 1 , Figure 3 shown, a mine extensible prop includes a lower column body 1, and further includes an upper column body 2 and a casing 3. The upper section of the lower column body 1 is sleeved inside the lower section of the casing 3, the lower section of the upper column body 2 is sleeved inside the upper section of the casing 3. A first fixing ring 4 is provided on the casing 3, a second fixing ring 5 is provided on the upper column body 2, and an adjusting lead screw 6 passing through the first fixing ring 4 and the second fixing ring 5 is further included. The adjusting lead screw 6 is provided with a limiting end face, and adjusting nuts 7 are arranged on both sides of the second fixing ring 5 and on the side of the first fixing ring 4 away from the limiting end face. The connection between the lower column body 1 and the casing 3 is welded in a ring shape. Its function is to adjust and lock the distance between the first fixing ring 4 and the second fixing ring 5 by adjusting the position of the adjusting nut 7 on the adjusting lead screw 6, so as to achieve the effect of adjusting and locking the total length of the prop.

[0039] Specifically, as Figure 1 , Figure 2 shown, the lower column body 1 is provided with a grouting hole 10, the top of the upper column body 2 is provided with an overflow hole 11, and at least one end of the casing 3 is provided with a reinforcing hoop 3a. Its function is that the grouting hole 10 is used for grouting into the prop, the overflow hole 11 is used to judge whether the grouting is completed, and the reinforcing hoop 3a is used to further increase the strength of the casing 3.

[0040] Specifically, as shown in Figure 3 and Figure 4 , a steel sleeve 26 is fixedly connected to the upper part of the upper cylinder 2 opposite to the adjusting lead screw 6. A pin 27 is provided at the lower end of the steel sleeve 26, and a round steel 28 is sleeved inside the steel sleeve 26. Its function is that after the support is assembled and erected, by inserting the round steel 28 into the drilled hole of the roof plate, the support can stand stably.

[0041] Specifically, as shown in Figure 1 and Figure 2 , both the upper cylinder 2 and the lower cylinder 1 are hollow cylinders. A sheath 8 is sleeved at the lower end of the upper cylinder 2 provided with the second fixing ring 5, and a through hole 9 is provided on the end face of the sheath 8. Its function is to enable the slurry to be injected into the casing 3 and the upper cylinder 2 through the lower cylinder 1.

[0042] Specifically, as shown in Figure 1 and Figure 2 , the sheath 8 is in a cylindrical shape. The sheath 8 is made of NBR material. The thickness of the side wall of the sheath 8 matches the gap between the upper cylinder 2 and the casing 3. The ratio of the inner diameter of the through hole 9 to the inner diameter of the upper cylinder 2 is between 1:2 and 1:30. Its function is to play a sealing role to prevent slurry leakage during grouting. When the slurry solidifies, since the sheath 8 is made of NBR material and has weak adhesion to the slurry, it is convenient to separate the solidified body near the through hole 9 in the later stage, facilitating the recovery of the support and reducing material waste.

[0043] Specifically, as shown in Figure 1 and Figure 2 and Figure 3 , a lower plate 12 is fixedly provided at the bottom end of the lower cylinder 1. Ground threaded holes 13 are provided at both ends of the lower plate 12. A lower connecting plate 14 is provided above the lower plate 12. At least one through slot 15 of the lower connecting plate is provided on the lower connecting plate 14. It also includes a ground bolt 16 matching the ground threaded hole 13. The ground bolt 16 passes through the through slot 15 of the lower connecting plate and is connected to the ground threaded hole 13. A ground anchor hole 17 for installing a ground anchor is provided on the lower connecting plate 14. Its function is to fix the support on the roadway floor. An upper plate 18 is fixedly provided at the top end of the upper cylinder 2. An upper connecting plate 19 is provided below the upper plate 18. A bolt hole 20 for installing a bolt is provided on the upper connecting plate 19. Its function is to fix the support on the roadway roof.

[0044] In the second aspect, as shown in Figure 5As shown in the figure, a mine extensible support system includes at least two of the above-mentioned mine extensible props. Connecting noses 21 are provided on both sides of the upper column body 2 and / or the lower column body 1 and / or the sleeve 3. Bolt holes 22 are provided on the connecting noses 21. The system also includes a connecting plate 23 with two connecting plate through slots 24. The two connecting plate through slots 24 respectively correspond to the bolt holes 22 on two adjacent connecting noses 21 of two adjacent mine extensible props. The system further includes at least two bolts 25 corresponding to the bolt holes 22. The bolts 25 pass through the connecting plate through slots 24 and are connected to the bolt holes 22. Its function is to adapt to the error change in the distance between props and improve the anti-deformation ability of the support system.

[0045] Specifically, as Figure 5 shown in the figure, the lower connecting plate 14 is provided with two lower connecting plate through slots 15. The two lower connecting plate through slots 15 respectively correspond to the ground screw holes 13 adjacent to the lower plates 12 of two adjacent mine extensible props. Both sides of the lower connecting plate 14 are in contact with the upper surfaces of the lower plates 12 of two adjacent mine extensible props. Both sides of the upper connecting plate 19 are in contact with the lower surfaces of the upper plates 18 of two adjacent mine extensible props.

[0046] In the third aspect, a construction process of a mine extensible support system includes the following steps:

[0047] S1: After inserting the lower section of the upper column body 2 without the second fixing ring 5 or the upper section of the lower column body 1 without the second fixing ring 5 into the sleeve 3, fix the lower section of the upper column body 2 or the upper section of the lower column body 1 to the sleeve 3. Then insert the other column body with the second fixing ring 5 into the other end of the sleeve 3.

[0048] S2: Pass the adjusting lead screw 6 through the first fixing ring 4 and the second fixing ring 5. Adjust and lock the length of the prop by adjusting the position of the adjusting nut 7. After reaching the required length, set up the prop vertically.

[0049] It also includes the following steps:

[0050] S0: Before inserting the lower section of the upper column body 2 with the second fixing ring 5 or the upper section of the lower column body 1 with the second fixing ring 5 into the sleeve 3, put the sheath 8 on the lower end of the upper column body 2 with the second fixing ring 5 or the upper end of the lower column body 1 with the second fixing ring 5.

[0051] Sm: Pass the round steel 28 through the steel sleeve 26 and insert it into the pre-drilled roof hole, and use the pin 27 to pin the round steel 28 to prevent it from falling, so that the prop can stand stably. Pass the bolt through the bolt hole 20 on the upper connecting plate 19, and then install the bolt into the pre-drilled roof bolt hole and fix it with a nut. Press the upper connecting plate 19 against the upper plates 18 of two adjacent props, so that the upper connecting plate 19 is fixed by the bolt.

[0052] Sn: After pressing the lower plates 12 of two adjacent columns with the lower connecting plate 14, pass the ground bolt 16 through the through slot 15 of the lower connecting plate and connect it with the ground threaded hole 13, then pass the ground anchor through the ground anchor hole 17 and install it into the pre-drilled bottom plate hole and fix it with a nut, so that the lower connecting plate 14 is fixed by the ground anchor;

[0053] So: Pass the bolt 25 through the through slot 24 of the connecting plate and connect it with the bolt hole 22, and tighten the nut on the bolt 25 to fix the connecting plate 23 on two adjacent connecting noses 21 of the adjacent columns;

[0054] Sp: After the column is fixedly installed, grout the column through the grouting hole 10. When the slurry flows out from the slurry overflow hole 11, it indicates that the inner cavity of the column is full, and stop grouting;

[0055] Se: When the column is no longer in use, remove the bolt 25 on the connecting plate 23, then remove the connecting plate 23, remove the nuts on the anchor rod and the ground anchor, take out the lower connecting plate 14 and the upper connecting plate 19, take out the pin 27, remove the round steel 28, lay down the column, rotate the upper column body 2 or the lower column body 1 with the sheath 8, and then separate the sleeve 3 and its fixedly connected lower column body 1 or upper column body 2 from the upper column body 2 or the lower column body 1 with the sheath 8 into two sections for recycling.

[0056] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. According to the technical essence of the present invention, within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A mine extensible prop, comprising a lower column body (1), characterized in that: It further includes an upper cylinder body (2) and a sleeve (3). The upper section of the lower cylinder body (1) is sleeved inside the lower section of the sleeve (3), and the lower section of the upper cylinder body (2) is sleeved inside the upper section of the sleeve (3). A first fixing ring (4) is provided on the sleeve (3), and a second fixing ring (5) is provided on the upper cylinder body (2) or the lower cylinder body (1). It further includes an adjusting lead screw (6) passing through the first fixing ring (4) and the second fixing ring (5). At least one adjusting nut (7) is provided on the adjusting lead screw (6). The lower cylinder body (1) or the upper cylinder body (2) away from the second fixing ring (5) is fixedly connected to the sleeve (3). Both the upper cylinder body (2) and the lower cylinder body (1) are hollow cylinder bodies. The lower cylinder body (1) is provided with grouting holes (10), and the top end of the upper cylinder body (2) is provided with slurry overflow holes (11). A sheath (8) is sleeved on the lower end of the upper cylinder body (2) provided with the second fixing ring (5) or the upper end of the lower cylinder body (1) provided with the second fixing ring (5). A through hole (9) is provided on the end face of the sheath (8). The sheath (8) is in a columnar shape. The sheath (8) is made of NBR material. The thickness of the side wall of the sheath (8) matches the gap between the upper cylinder body (2) or the lower cylinder body (1) sleeved with the sheath (8) and the sleeve (3). The inner diameter ratio of the through hole (9) to the inner diameter of the upper cylinder body (2) or the lower cylinder body (1) where the sheath (8) is located is between 1:2 and 1:

30. A lower plate (12) is fixedly provided at the bottom end of the lower cylinder body (1). Threaded holes (13) are provided at both ends of the lower plate (12). A lower connecting plate (14) is provided above the lower plate (12). At least one lower connecting plate through slot (15) is provided on the lower connecting plate (14). It further includes a ground bolt (16) matching the threaded holes (13). The ground bolt (16) passes through the lower connecting plate through slot (15) and is connected to the threaded holes (13). An anchor hole (17) for installing a ground anchor is provided on the lower connecting plate (14). An upper plate (18) is fixedly provided at the top end of the upper cylinder body (2). An upper connecting plate (19) is provided below the upper plate (18). An anchor rod hole (20) for installing an anchor rod is provided on the upper connecting plate (19).

2. The extensible support for mine use according to claim 1, characterized in that: At least one end of the sleeve (3) is provided with a reinforcing hoop (3a).

3. A telescopic prop for mine use according to claim 1, characterized in that: A steel sleeve (26) is fixedly connected to the upper part of the upper cylinder body (2). A pin (27) is provided at the lower end of the steel sleeve (26). A round steel (28) is sleeved inside the steel sleeve (26).

4. A mine extensible support system, characterized in that: It includes at least two mine-use telescopic props as described in any one of claims 1-3. Connecting noses (21) are provided on both sides of the upper cylinder body (2) and / or the lower cylinder body (1) and / or the sleeve (3). Bolt holes (22) are provided on the connecting noses (21). It further includes a connecting plate (23). Two connecting plate through slots (24) are provided on the connecting plate (23). The two connecting plate through slots (24) respectively correspond to the bolt holes (22) on two adjacent connecting noses (21) of two adjacent mine-use telescopic props. It further includes at least two bolts (25) corresponding to the bolt holes (22). The bolts (25) pass through the connecting plate through slots (24) and are connected to the bolt holes (22).

5. A mine extensible support system according to claim 4, characterized in that: The lower connecting plate (14) is provided with two lower connecting plate through slots (15), and the two lower connecting plate through slots (15) respectively correspond to the ground threaded holes (13) adjacent to the lower plates (12) on two adjacent mine extensible props. Both sides of the lower connecting plate (14) are in contact with the upper surfaces of the lower plates (12) on two adjacent mine extensible props, and both sides of the upper connecting plate (19) are in contact with the lower surfaces of the upper plates (18) on two adjacent mine extensible props.

6. Construction process of a mine extensible support system, characterized in that: Applying to a mine extensible prop according to any one of claims 1 - 3, the following steps are included: S1: After inserting the lower section of the upper cylinder body (2) without the second fixing ring (5) or the upper section of the lower cylinder body (1) without the second fixing ring (5) into the sleeve (3), fixedly connect the lower section of the upper cylinder body (2) or the upper section of the lower cylinder body (1) with the sleeve (3), and then insert the other cylinder body with the second fixing ring (5) into the other end of the sleeve (3); S2: Pass the adjusting lead screw (6) through the first fixing ring (4) and the second fixing ring (5), adjust and lock the length of the prop by adjusting the position of the adjusting nut (7). After reaching the required length, set up the prop vertically.

7. The construction process of a mine - used telescopic support system according to claim 6, characterized in that: The following steps are also included: S0: Before inserting the lower section of the upper cylinder body (2) with the second fixing ring (5) or the upper section of the lower cylinder body (1) with the second fixing ring (5) into the sleeve (3), sleeved the sheath (8) on the lower end of the upper cylinder body (2) with the second fixing ring (5) or the upper end of the lower cylinder body (1) with the second fixing ring (5); Sm: Pass the round steel (28) through the steel sleeve (26) and insert it into the pre - drilled roof borehole, and pin the round steel (28) with the pin (27). The bolt passes through the bolt hole (20) on the upper connecting plate (19), and then installs the bolt into the pre - drilled roof bolt borehole and fixes it with a nut. Press the upper connecting plate (19) against the upper plates (18) of two adjacent props, so that the upper connecting plate (19) is fixed by the bolt; Sn: After pressing the lower connecting plate (14) against the lower plates (12) of two adjacent props, pass the ground bolt (16) through the lower connecting plate through slot (15) and connect it with the ground threaded hole (13), then pass the ground anchor through the ground anchor hole (17) and install it into the pre - drilled floor borehole and fix it with a nut, so that the lower connecting plate (14) is fixed by the ground anchor; So: Pass the bolt (25) through the connecting plate through slot (24) and connect it with the bolt hole (22), so that the connecting plate (23) is fixed on two adjacent connecting noses (21) of the two adjacent props; Sp: After the prop is fixedly installed, grout the prop through the grouting hole (10). When the slurry flows out from the slurry overflow hole (11), it indicates that the inner cavity of the prop is full, and stop grouting; Se: When the pillar is no longer in use, after taking out the bolts (25) on the connecting plate (23), remove the connecting plate (23), remove the nuts on the anchor rod and the ground anchor, take out the lower connecting plate (14) and the upper connecting plate (19), take out the pins (27), remove the round steel (28), lay down the pillar, rotate the upper column (2) or the lower column (1) with the sleeve (8), and separate the casing (3) and the lower column (1) or the upper column (2) fixedly connected thereto from the upper column (2) or the lower column (1) with the sleeve (8) into two sections for recycling.

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