U-shaped steel beam roadway advance support roof fall prevention safety fixing device

Abstract

The utility model discloses a U-shaped steel beam roadway advance support roof fall prevention safety fixing device, and relates to the technical field of underground roadway development, tunneling and roadway maintenance, the U-shaped steel beam roadway advance support roof fall prevention safety fixing device comprises a plurality of sets of fixing assemblies which are used in a spaced and matched mode, the fixing assemblies are arranged in the length direction of a forepoling bar of an underground roadway, and each fixing assembly comprises a positioning plate. A positioning hole is formed in the middle of the positioning plate, and a fixing device used for fixing the forepoling bar is connected into the positioning hole in a threaded mode. The four corners of the positioning plate are provided with non-through grooves, the two sides of each groove are provided with bosses, and the middle of each boss is provided with a bolt hole. Clamping hooks are inserted into the four grooves respectively, first clamping hook connecting holes are formed in the bottom ends of the clamping hooks, fixing pieces penetrate through the plug pin holes and the first clamping hook connecting holes to fix the clamping hooks, and the contact faces of the fixing pieces and the plug pin holes in the bosses on the two sides are welded; the roof fall prevention safety fixing device is not easy to open and break under the action of stress.

Description

Technical Field

[0001] This utility model belongs to the technical field of underground roadway development, tunneling and roadway maintenance, and particularly relates to a safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving. Background Technique

[0002] During the first use of the safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving, roof caving accidents often occurred at the empty roof area of the U-shaped steel supported roadway section. The hooks of the safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving were deformed and broken, the center hole of the positioning plate was distorted at the folding place, the front exploration beam was distorted, the roadway roof caved in and collapsed, and the U-shaped steel beam shed was destroyed and deformed. Many casualties occurred, and the coal mine safety department suspended work and production at the working face, carried out rectification and acceptance, and investigated legal responsibilities.

[0003] In response to the above problems, the leaders of the coal mine safety department, coal mine expert groups and technical management personnel conducted on-site inspections to understand the situation. It was found that there were problems with the temporary support at the empty roof area of the working face, the quality of the temporary support was poor, the empty roof time of the working face was long, the roof generated pressure. When the pressure increased, the hooks on the safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving were deformed and broken, the circular steel pins at the connecting holes of the hook legs and the rectangular holes of the positioning plate were welded and broken, the center hole of the positioning plate was folded and bent, and some positioning plates were deformed across the waist.

[0004] Scientific analysis and diagnosis were carried out for the above situation.

[0005] The components of the safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving are composed of 4 hooks, 1 positioning plate, 2 tensioning screw rods, 1 lifting jack rod, etc. by welding.

[0006] Previously, when processing the safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving, the 4 hooks were cut into hooks manually with an acetylene and oxygen torch at high temperature. It was an artificial operation in the original method, holding the oxygen cutting tool by hand without fixed cutting. The cut hooks had a large error, and the cut hook surface was inaccurate, not matching the U-shaped steel beam surface. The hook surface was uneven, with serrations, not a complete plane. The force on the 4 hooks was uneven, some hooks had zero force, and some hooks had over-strength force. When manually cutting the hooks, multiple people were involved in the operation, and there were errors in the operation technology. When the 4 hooks were assembled on the positioning plate, they were not on the same horizontal plane. The front exploration beam placed on the roof disk was also not on a horizontal plane and did not form a straight line. The front exploration beam was inclined and could not play a role in the temporary support. When pressure was generated at the empty roof area of the working face, the front exploration beam originally had an inclination. As the pressure increased, due to uneven force, it was very easy to push and distort the front exploration beam. After the front exploration beam was distorted, due to the insufficient thickness and low hardness of the hook, it was deformed under force.

[0007] Insert the round steel pin into the connecting hole of the hook. The lower semi-circular surface of the round steel pin is welded to the upper end surface of the rectangular through-hole of the positioning plate. The upper half of the round steel pin is not connected or fixed to any object. The area of the welding point is small. When pressure is generated on the top plate, the welding point of the round steel pin is likely to be welded open and broken.

[0008] The center hole position of the positioning plate is distorted and deformed under stress. The main reason is that the center hole position of the positioning plate mainly supports all the pressure of the front-probing beam, and all the pressure is concentrated at the center hole position of the positioning plate. The end face of the threaded round hole is equal to the thickness of the overall positioning plate, and the hardness of the positioning plate is low, reducing the support strength.

[0009] In the U-shaped steel roadway working face, roof falls and collapses often occur. In order to prevent such accidents from happening again, the advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways must be improved and enhanced in terms of material selection and technical workmanship.

[0010] Based on the above actual situation, a research group was established to specifically tackle the issue of the advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways.

[0011] From March 2023 to June 2024, through one year of research and experiments, making molds many times and continuously repairing and rectifying, the overall improvement of the advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways is required. In order to prevent the four hooks and the positioning plate from deforming under pressure during normal use, it is necessary to enhance the hardness of the materials of the hooks and the positioning plate, with high precision and good stability. Make product accessories using cast steel parts for the molds.

[0012] Use cast steel parts to process the hooks and the positioning plate for the molds. Cast steel parts have high hardness, are not easily deformed under stress, are evenly stressed, and do not require manual operation for processing. The precision of the products processed by one mold can reach 100%. The hook surface and the card surface are smooth and flat. At the position where the positioning hole can generate threads at the center position of the positioning plate, bosses and thickness can be added on the template. Utility Model Content

[0013] The purpose of this utility model is to provide an advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways to solve the above problems existing in the prior art.

[0014] To achieve the above purpose, this utility model adopts the following technical solutions:

[0015] An advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways, comprising multiple sets of fixing components used in an interval manner. The fixing components are arranged along the length direction of the front-probing beam in the underground roadway. Each fixing component includes a positioning plate, with a positioning hole provided in the middle of the positioning plate. A fixing device for fixing the front-probing beam is threadedly connected in the positioning hole. Non-penetrating grooves are provided at the four corners of the positioning plate, with convex platforms provided on both sides of the grooves, and a pin hole is provided in the middle of the convex platforms. Four hooks for fixing the outer sides of the front and rear ends of the U-shaped steel beam are respectively inserted into the four grooves. A first hook connection hole is provided at the bottom end of the hook, and the first hook connection hole and the pin holes on both sides of the convex platform are on the same axis. A fixing piece is further included. The fixing piece passes through the pin holes on both sides of the convex platforms and the first hook connection hole at the bottom end of the hook to fix the hook between the two convex platforms, and the fixing piece is welded on the contact surface with the pin holes on both sides of the convex platforms.

[0016] For the advanced support anti-roof-fall safety fixing device of the U-shaped steel beam roadway of the present utility model, the four non-penetrating grooves provided at the four corners of the positioning plate, with convex platforms provided on both sides of the grooves, a pin hole provided in the middle of the convex platforms, and a first hook connection hole provided at the bottom of the hook. After the fixing piece is inserted into the first hook connection hole from the pin hole on the outer side surface of one convex platform and then passes through and continues to be inserted into the outer end surface of the other convex platform, the fixing piece is movably connected in the hook connection hole. Then, the outer side surface of one convex platform and the outer side surface of the pin hole at one end of the fixing piece are welded together, and the outer side surfaces of the three components are welded into a plane. The other side is also welded into a plane in the same way. The hook is movably connected and fixed between the two convex platforms and can be opened and closed. Compared with the existing technology, the fixing piece is inserted into the first connection hole of the hook, the lower end surface is directly welded on the positioning plate, and the upper end surface is not connected and fixed to any object. For this fixing device with a simple design, under long-term force and handling, the solder joints are easily welded open. The anti-roof-fall safety fixing device of the present utility model is not easily welded open and broken under the action of force. It solves the problems of welding open and breaking of the advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadways during operation and handling.

[0017] Optionally, reinforcing convex platforms are provided around the upper and lower end surfaces of the positioning hole, and a trapezoidal threaded hole is provided in the middle of the reinforcing convex platforms. The trapezoidal threaded hole and the positioning hole on the positioning plate are on the same axis.

[0018] Optionally, a reinforcing rib is provided along the edge of the hook in a circle, and the contact surface between the hook and the U-shaped steel beam is widened.

[0019] Optionally, the fixator includes a top plate and a lifting rod connected to the lower end of the top plate. A clamping piece is provided at the lower end of the top plate, and a clamping groove is provided at the top of the lifting rod. The clamping piece is stuck in the clamping groove and is rotatably connected to the lifting rod. A trapezoidal thread is provided in the middle of the lifting rod, and a first rotating device is provided at the lower end of the lifting rod.

[0020] Optionally, a lower-end surface groove is provided on the lower end surface of the top plate, and an upper-end surface groove is provided on the upper end surface of the lifting rod. The upper-end surface groove and the lower-end surface groove enclose a spherical closed space, and a ball is arranged in the spherical closed space, and the ball can rotate in the spherical closed space.

[0021] Optionally, second hook connection holes are provided on all four of the hooks.

[0022] Optionally, for the second hook connection holes on the same side, a bushing is provided on one second hook connection hole, and a nut is provided on the other second hook connection hole; connecting rods are provided on both the bushing and the nut, and the bushing and the nut are movably connected to the hook through the connecting rods.

[0023] Optionally, a lead screw is threadedly connected inside the bushing and the nut, and a second rotating device is provided at the end of the lead screw.

[0024] Optionally, a fixing ring is welded on the lead screw; the fixing ring is located between the bushing and the nut.

[0025] Optionally, a set of rotating wheels is arranged on the upper end surface of the positioning plate parallel to the short side.

[0026] Beneficial effects: For the advanced support anti-roof-fall safety fixing device of the U-shaped steel beam roadway in the present utility model, the four grooves provided at the four corners of the positioning plate are non-penetrating grooves, convex platforms are provided on both sides of the grooves, pin holes are provided in the middle of the convex platforms, and a first hook connection hole is provided at the bottom of the hook. After the fixing piece is inserted into the first hook connection hole from the pin hole on the outer side surface of one convex platform and passes through, it continues to be inserted into the outer end surface of the other convex platform. The fixing piece is inserted into the hook connection hole and is movably connected. Then, the outer side surface of one convex platform and the outer side surface of the pin hole at one end of the fixing piece are welded together, and the outer side surfaces of the three components are welded into a plane. The other side is also welded into a plane in the same way. The hook is movably connected and fixed between the two convex platforms and can be opened and closed. Compared with the existing technology, in which the fixing piece is inserted into the first connection hole of the hook, the lower end surface is directly welded to the positioning plate, and the upper end surface is not connected and fixed to any object, for this fixing device with a simple design, the welding points are easily welded open under long-term stress and handling. The anti-roof-fall safety fixing device of the present utility model is not easily welded open or broken under stress. It solves the problems of welding open and breaking of the advanced support anti-roof-fall safety fixing device of the U-shaped steel beam roadway during operation and handling. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure of the advanced support anti-roof-fall safety fixing device of the U-shaped steel beam roadway in the embodiment;

[0028] Figure 2 It is a top view of the positioning plate in the embodiment;

[0029] Figure 3 Schematic diagram of the overall structure of the card hook in the embodiment;

[0030] Figure 4 Side view of the positioning plate in the embodiment;

[0031] Figure 5 Side view of the card hook in the embodiment;

[0032] Figure 6 Schematic diagram of the overall structure of the fixing device in the embodiment;

[0033] Figure 7 Schematic diagram of the overall structure of the lifting rod in the embodiment;

[0034] Figure 8 Connection diagram of the shaft sleeve and the connecting rod in the embodiment;

[0035] Figure 9 Connection diagram of the nut and the connecting rod in the embodiment;

[0036] Figure 10 Clamping schematic diagram of the advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadway and the U-shaped steel beam in the embodiment.

[0037] In the figure: 1, positioning plate; 2, positioning hole; 3, fixing device; 31, top plate; 311, pinching piece; 312, lower end face groove; 32, lifting rod; 321, pinching groove; 322, upper end face groove; 4, groove; 5, boss; 6, pin hole; 7, card hook; 8, first card hook connection hole; 9, strengthening boss; 10, first rotating device; 11, ball; 12, second card hook connection hole; 13, shaft sleeve; 14, nut; 15, connecting rod; 16, screw rod; 17, second rotating device; 18, fixing ring; 19, rotating wheel. Detailed implementation manners

[0038] Embodiment

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the accompanying drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the accompanying drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but do not constitute a limitation to the present invention.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanations, these orientation words do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] In the description of the present utility model, it should be understood that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without additional declarations, the above words have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0042] As Figures 1-9 shown, this embodiment provides a safety fixing device 3 for preventing roof caving in the advanced support of U-shaped steel beam roadways, which includes multiple groups of fixing components used in cooperation at intervals. The fixing components are arranged along the length direction of the forward exploration beam in the underground roadway. Refer to Figure 1 and Figure 2 , the fixing component includes a positioning plate 1. A positioning hole 2 is provided in the middle of the positioning plate 1. A fixing device 3 for fixing the forward exploration beam is threadedly connected in the positioning hole 2; non-penetrating grooves 4 are provided at the four corners of the positioning plate 1. Convex platforms 5 are provided on both sides of the groove 4, and a pin hole 6 is provided in the middle of the convex platform 5; Four of the said grooves 4 are respectively inserted with hooks 7 for fixing the outer sides of the front and rear ends of the U-shaped steel beam. Refer to Figure 3 , a first hook connection hole 8 is provided at the bottom end of the hook 7. The first hook connection hole 8 and the pin holes 6 on both sides of the convex platform 5 are on the same axis; a fixing member is also included. The fixing member passes through the pin holes 6 on both sides of the convex platform 5 and the first hook connection hole 8 at the bottom end of the hook 7 to fix the hook 7 between the two convex platforms 5. The fixing member is welded on the contact surface with the pin holes 6 on both sides of the convex platform 5.

[0043] Specifically, the fixing member is a round steel pin. An electric welding machine is used manually to weld the two ends of the round steel pin, the two convex platforms 5 and the two pin holes 6 on the same plane respectively to form an integral body. The pin hole 6 and the side surface of the convex platform 5 are welded into an integral structure, which enhances the overall compressive capacity of the positioning plate 1 and the convex platform 5. The hook 7 is movably connected to the round steel pin. When the hook 7 is stressed, it can open in the opposite direction or close in the relative direction.

[0044] In the specific implementation process, both the clamping hook 7 and the positioning plate 1 are processed from cast steel parts by using a mold. The cast steel parts have a large material hardness and are not easily deformed under force. The surface of the clamping hook 7 is smooth and flat. The clamping hook 7 is fixed on the positioning plate 1 as a complete surface, and when it is clamped on the U-shaped steel beam, it is a horizontal plane. The front-probing beam is placed on the fixing device 3 in a straight line, and the four clamping hooks 7 are all under balanced force. When pressure occurs on the roof, the front-probing beam will not deform or twist.

[0045] Further, referring to Figure 4 , reinforcing bosses 9 are arranged around the upper and lower end faces of the positioning hole 2. A trapezoidal threaded hole is arranged in the middle of the reinforcing boss 9, and the trapezoidal threaded hole and the positioning hole 2 on the positioning plate 1 are on the same axis. Specifically, the reinforcing boss 9 is arranged along the circumferential direction of the positioning hole 2. By arranging the reinforcing boss 9, the thickness and height around the positioning hole 2 are increased. When in use, the fixing device 3 is threadedly connected with the positioning plate 1 and the reinforcing boss 9. The front-probing beam is located on the fixing device 3, and the front-probing beam can be clamped and released by rotating the fixing device 3 up and down.

[0046] Further, referring to Figure 5 , reinforcing ribs are arranged in a circle along the edge of the clamping hook 7, and the contact surface between the clamping hook 7 and the U-shaped steel beam is widened. The contact area between the clamping hook 7 and the U-shaped steel beam is increased, enhancing the compressive capacity. Reinforcing ribs are arranged in a circle along the edge of the clamping hook 7. Without increasing the overall thickness of the clamping hook 7, while reducing its own weight, the hardness is enhanced. With the support of the reinforcing ribs, the clamping hook 7 is not easily deformed under force.

[0047] Further, referring to Figure 6 and Figure 7 , the fixing device 3 includes a top plate 31 and a lifting rod 32 connected to the lower end of the top plate 31. A clamping piece 311 is arranged at the lower end of the top plate 31, and a clamping groove 321 is arranged at the top of the lifting rod 32. The clamping piece 311 is stuck in the clamping groove 321. A trapezoidal thread is arranged in the middle of the lifting rod 32, and a first rotating device 10 is arranged at the lower end of the lifting rod 32. Specifically, the top plate 31 is a disc, and two clamping pieces 311 are symmetrically welded below the disc. The clamping groove 321 is arranged along the circumferential direction at the top of the lifting rod 32. The clamping piece 311 is stuck in the clamping groove 321, and the clamping piece 311 is movably connected with the lifting rod 32. A cross lever hole is arranged on the first rotating device 10. When in use, a lever is inserted into the cross lever hole, and by rotating the first rotating device 10, the fixing device 3 can be lifted up and down.

[0048] Further, referring to Figure 6 and Figure 7, a lower-end surface groove 312 is provided on the lower end surface of the top plate 31, and an upper-end surface groove 322 is provided on the upper end surface of the lifting rod 32. The upper-end surface groove 322 and the lower-end surface groove 312 enclose a spherical closed space, and a rolling ball 11 is arranged in the spherical closed space; specifically, the rolling ball 11 can rotate in the spherical closed space; when the top plate 31 is stressed, there will be no detachment or breakage phenomenon.

[0049] Further, referring to Figure 1 and Figure 3 , second hook connection holes 12 are provided on all four of the hooks 7; for the second hook connection holes 12 on the same side, a bushing 13 is provided on one second hook connection hole 12, and a nut 14 is provided on the other second hook connection hole 12; referring to Figure 8 and Figure 9 , connecting rods 15 are provided on both the bushing 13 and the nut 14, and the bushing 13 and the nut 14 are movably connected to the hook 7 through the connecting rod 15; referring to Figure 1 , a lead screw 16 is threadedly connected inside the bushing 13 and the nut 14, and a second rotating device 17 is provided at the end of the lead screw 16; specifically, a flat optical pad with a hole is sleeved on the outer diameter of the end of the connecting rod 15, and the flat optical pad and the end of the connecting rod 15 are welded into a whole to form a plane. The inner hole diameter of the flat optical pad is larger than the outer diameter of the connecting rod 15. The flat optical pad is sleeved on the outer diameter of the end of the connecting rod 15 and welded together. The connecting rod 15 is movably connected in the second hook connection hole 12. The outer diameter of the flat optical pad is larger than the inner diameter of the second hook connection hole 12 to prevent it from slipping out of the second hook connection hole 12; the second rotating device 17 is a cross lever hole; during use, the lever is inserted into the cross lever hole, and rotating the lead screw 16 can realize the clamping and loosening of the hooks 7 on the same side.

[0050] Further, referring to Figure 1 , a fixing ring 18 is welded on the lead screw 16; the fixing ring 18 is located between the bushing 13 and the nut 14. Through the setting of the fixing ring 18, the bushing 13 will not move when the lead screw 16 is rotated, and the bushing 13 and the nut 14 cooperate with each other and rotate smoothly.

[0051] Further, referring to Figure 10 , a set of rotating wheels 19 are arranged on the upper end surface of the positioning plate 1 parallel to the short side. Through the setting of the rotating wheels 19, the front-probing beam is placed on the rotating wheels 19, and the front-probing beam is manually pushed towards the working face direction.

[0052] Working principle:

[0053] (1) Rotate the lead screw 16 counterclockwise, and the opposite pairs of hooks 7 move in opposite directions, and the hooks 7 open. Place the opened pairs of hooks 7 on the top surface of the U-shaped steel beam. During this period, the U-shaped steel roadway advanced support anti-roof-fall safety fixing device is in a loose state and needs to be held manually;

[0054] (2) One person picks up the (standing-by) lever and inserts it into the cross-lever hole, then rotates the lead screw 16 clockwise. The two pairs of opposite hooks 7 move towards the opposite directions, and the space of the hooks 7 gradually shrinks until the lead screw 16 can no longer be rotated. The hooks 7 are stuck on the U-shaped steel beam without loosening or falling off.

[0055] (3) Before placing the front-probing beam, rotate the fixing device 3 to lower the height to the lowest level. If it is not already at the lowest level, it still needs to be lowered to the lowest level. The height of the top plate 31 is lower than the height of the rotating wheel 19, and the space above the top plate 31 is the largest. Place the front-probing beam on the rotating wheel 19, above the top plate 31. The front-probing beam can be manually pushed towards the working face direction. Insert the lever into the cross-lever hole and rotate the lifting rod 32 clockwise. The top plate 31 holds the front-probing beam upwards. Rotate the fixing device 3 spirally, and the top plate 31 and the front-probing beam gradually rise. The front-probing beam holds up the U-shaped steel beam and the standby materials. The U-shaped steel beam is close to the roof, controlling the shedding of the standby materials and effectively controlling the occurrence of roof accidents.

[0056] It should be noted that generally, a double-row 6-pair U-shaped steel roadway advanced support anti-roof-fall safety fixing device is set. The installation and fixation are in a straight line. The interval distance between the double rows is determined according to the cross-sectional area of the U-shaped steel roadway. The distance between the anti-roof-fall safety fixing devices should not be greater than one meter.

[0057] According to the specified requirements, manually place the front-probing beam on the top plate 31 of the U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device at a place with good support and in a safe area. Move the front-probing beam from left to right. For the safety of the workers at the working face, the length of the front-probing beam should be not less than 3.6 meters. Move the front-probing beam to the section with empty roof, hold up the temporary support standby materials for the section with empty roof, and then manually insert the standing-by lever into the cross-lever hole of the lifting rod 32 and rotate it clockwise from left to right. The lifting rod 32 spirally rises, the ball 11 rotates, and the top plate 31 holds the front-probing beam and gradually contacts the bottom surface of the U-shaped steel beam. Rotate in a cycle, the top plate 31 holds the bottom surface of the front-probing beam, the bottom surface of the front-probing beam presses against the bottom surface of the U-shaped steel beam, and the top plate 31 is firmly fixed on the bottom surface of the front-probing beam, pressing firmly without loosening. Only in this safe situation can workers carry out operations in the space of the temporarily supported roadway. After the empty roof section of the working face is well supported, the next work process can be carried out.

[0058] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A safety fixing device for the advanced support of U-shaped steel beam roadways to prevent roof caving, characterized in that, It includes multiple groups of fixed components used in an intermittent manner. The fixed components are arranged along the length direction of the front-probing beam in the underground roadway. The fixed component includes a positioning plate (1). A positioning hole (2) is provided in the middle of the positioning plate (1). A fixing device (3) for fixing the front-probing beam is threadedly connected in the positioning hole (2). Non-penetrating grooves (4) are provided at the four corners of the positioning plate (1). Convex platforms (5) are provided on both sides of the groove (4). A pin hole (6) is provided in the middle of the convex platform (5). Hooks (7) for fixing the outer sides of the front and rear ends of the U-shaped steel beam are respectively inserted into the four grooves (4). A first hook connection hole (8) is provided at the bottom end of the hook (7). The first hook connection hole (8) and the pin holes (6) on both sides of the convex platform (5) are on the same axis. It also includes a fixing piece. The fixing piece passes through the pin holes (6) on both sides of the convex platform (5) and the first hook connection hole (8) at the bottom end of the hook (7) to fix the hook (7) between the two convex platforms (5). The fixing piece is welded on the contact surface with the pin holes (6) on both sides of the convex platform (5).

2. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 1, characterized in that, Reinforcing convex platforms (9) are provided around the upper and lower end faces of the positioning hole (2). A trapezoidal thread hole is provided in the middle of the reinforcing convex platform (9). The trapezoidal thread hole and the positioning hole (2) on the positioning plate (1) are on the same axis.

3. The advanced support anti-roof-fall safety fixing device for U-shaped steel beam roadway according to claim 1, characterized in that, Reinforcing ribs are provided along the edge of the hook (7) in a circle. The contact surface between the hook (7) and the U-shaped steel beam is widened.

4. The advanced support anti-roof-fall safety fixing device for U-shaped steel girder roadways according to claim 1, characterized in that, The fixing device (3) includes a top plate (31) and a lifting rod (32) connected to the lower end of the top plate (31). A clamping piece (311) is provided at the lower end of the top plate (31). A clamping groove (321) is provided at the top of the lifting rod (32). The clamping piece (311) is stuck in the clamping groove (321) and is rotatably connected to the lifting rod (32). A trapezoidal thread is provided in the middle of the lifting rod (32). A first rotating device (10) is provided at the lower end of the lifting rod.

5. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 4, characterized in that, A lower-end groove (312) is provided on the lower end face of the top plate (31). An upper-end groove (322) is provided on the upper end face of the lifting rod (32). The upper-end groove (322) and the lower-end groove (312) enclose a spherical closed space. A ball (11) is provided in the spherical closed space. The ball (11) can rotate in the spherical closed space.

6. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 1, characterized in that, Second hook connection holes (12) are provided on all four hooks (7).

7. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 6, characterized in that, For two second hook connection holes (12) on the same side, a bushing (13) is provided on one second hook connection hole (12), and a nut (14) is provided on the other second hook connection hole (12). Connecting rods (15) are provided on both the bushing (13) and the nut (14). The bushing (13) and the nut (14) are movably connected to the hook (7) through the connecting rod (15).

8. The advanced support anti-roof-fall safety fixing device for U-shaped steel girder roadways according to claim 7, wherein, A lead screw (16) is threadedly connected inside the bushing (13) and the nut (14). A second rotating device (17) is provided at the end of the lead screw (16).

9. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 8, characterized in that, A fixing ring (18) is welded on the lead screw (16). The fixing ring (18) is located between the bushing (13) and the nut (14).

10. The U-shaped steel beam roadway advanced support anti-roof-fall safety fixing device according to claim 1, characterized in that, A set of rotating wheels (19) are arranged on the upper end surface of the positioning plate (1) in parallel along the short side.

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