CN117588217B - Initial reinforcing and supporting system for coal seam goaf tunnel - Google Patents

Abstract

The present invention relates to an initial reinforcement and support system for a coal seam goaf tunnel, comprising: a support pile, which is supported in a goaf area below a target tunnel, one end of the support pile passes through the goaf area and is located below the goaf area, and the other end of the support pile is used to support the target tunnel; a steel frame, which is arranged on the support pile, and the steel frame is used to support the target tunnel; a steel flower pipe, which is arranged below the target tunnel and one end of which is used to be connected to the steel frame, the steel flower pipe comprises an insertion end and a grouting end, the insertion end passes through the goaf area and is located below the goaf area, a slurry outlet hole is provided on the steel flower pipe, and the grouting end is used to connect a grouting pipeline; the steel flower pipe is connected to the steel frame, so that a support system is formed between the steel flower pipe and the steel frame, ensuring that the soil layer above the goaf area is connected to the steel frame and the steel flower pipe as a whole, so that the soil layer above the goaf area is not easy to collapse, etc., ensuring that the supporting structure of the support pile and the steel flower pipe is not affected, and greatly improving the safety of the tunnel in use.

Description

Initial reinforcement and support system of tunnel in coal seam goaf area

Technical Field

The invention relates to the technical field of tunnel support structures, and in particular to an initial reinforcement and support system for a tunnel in a coal seam goaf area.

Background Art

When shallow-buried tunneling is carried out in soft, broken, loose, and unstable strata, the main reason for support is to ensure the safety of workers, protect surrounding buildings, stabilize the construction environment, and protect underground pipelines and facilities. Soft strata are prone to unstable phenomena such as collapse and sliding, which poses a great safety risk. Ground damage may cause settlement, tilting or damage to surrounding buildings, affecting construction progress and quality. In addition, deformation and damage of soft strata will also affect underground pipelines and facilities.

To this end, it is necessary to pre-reinforce and pre-support the strata. The timeliness of the initial support construction of the tunnel and the strength and rigidity of the support have a decisive influence on ensuring the stability of the tunnel after excavation and reducing stratum disturbance and surface settlement.

However, when there are coal seam goafs around tunnels, the deformation of the goafs will bring huge risks to the use of the tunnels. The existing grouting reinforcement methods for the goafs and their overlying strata are limited by the single monitoring method, and are more likely to result in insufficient grouting, resulting in the failure to form a good overall structure in the area affected by the goafs, affecting the reinforcement effect and laying hidden dangers for tunnel projects.

Summary of the invention

In order to solve the above-mentioned problems, the present application provides an initial reinforcement and support system for a tunnel in a coal seam goaf area.

The above-mentioned invention object of the present invention is achieved through the following technical scheme: an initial reinforcement and support system for a tunnel in a coal seam goaf area, comprising:

A support pile, supported in a mined area below a target tunnel, wherein one end of the support pile passes through the mined area and is located below the mined area, and the other end of the support pile is used to support the target tunnel;

A steel frame, arranged on the supporting piles, the steel frame being used to support the target tunnel;

A steel flower pipe is arranged below the target tunnel and one end of which is used to be connected to a steel frame. The steel flower pipe comprises an insertion end and a grouting end. The insertion end passes through the goaf area and is located below the goaf area. A slurry outlet hole is arranged on the steel flower pipe, and the grouting end is used to connect a grouting pipe.

Preferably, a conduit is provided inside the steel flower pipe, a connecting hole is provided on the steel flower pipe, the connecting hole connects the inside and outside of the steel flower pipe, one end of the conduit is located at the grouting end, the other end of the conduit is connected with the connecting hole, and the connecting point between the conduit and the connecting hole is located inside the steel flower pipe, a pull wire is provided inside the conduit, the pull wire passes through the connecting hole to go out of the steel flower pipe, and one end of the pull wire located at the grouting end is detachably connected with a detection device for detecting the tension exerted on the pull wire.

Preferably, the connection between the conduit and the connecting hole is transitioned through an arc, and the tangent direction of the arc segment of the conduit at the connecting hole forms an acute angle with the axial direction of the steel flower tube.

Preferably, one end of the pull wire located outside the steel flower tube is connected to a stopper, and the stopper includes at least one arc surface for fitting with the outer wall of the steel flower tube.

Preferably, the pull wire passes through a block from the arc surface, the block is slidably connected to the pull wire, and one end of the pull wire passing through the block is connected to a plurality of scattered high-strength silk threads, the high-strength silk threads are wavy, and the pull wire is tied with a knot on the side of the block away from the arc surface.

Preferably, the grouting end is provided with a sealing plug, the sealing plug is provided with a hole for the catheter to pass through, the sealing plug is used to seal the space between the inner wall of the steel flower pipe and the outer wall of the catheter, the steel flower pipe is provided with a grouting interface pipe, the grouting interface pipe is connected to the interior of the steel flower pipe, and the internal connection point between the grouting interface pipe and the steel flower pipe is located on the steel flower pipe between the sealing plug and the insertion end.

Preferably, a blocking plug is provided at the connection hole, and a through hole is provided on the blocking plug for the pull wire to pass through, and the pull wire and the through hole are interference fit.

Preferably, the detection device includes a shell fixed on a steel frame, the shell is connected to one end of the catheter located at the grouting end, a sliding plate is arranged in the shell, the sliding plate is slidably arranged in the shell along the direction from the grouting end to the insertion end, an elastic member is arranged between the sliding plate and the shell for allowing the sliding plate to always move toward the side away from the insertion end, the pull wire is connected to the sliding plate, a first conductive part is arranged in the shell, a second conductive part is arranged on the sliding plate, an aluminum wire is connected between the first conductive part and the second conductive part, and a conducting wire is connected to the first conductive part and the second conductive part, when the pull wire is subjected to a certain tensile force, the sliding plate will slide toward the insertion end side, and the aluminum wire will be broken when the sliding plate slides a certain distance.

Preferably, there are several steel flower pipes, at least some of which are provided with conduits. When there are multiple steel flower pipes with conduits, the steel flower pipes with conduits are evenly distributed below the target tunnel, and the conduits in different steel flower pipes have different lengths.

Preferably, a support rod is provided outside the steel flower tube, and an annular baffle is provided on the side of the steel flower tube close to the insertion end. The annular baffle surrounds the steel flower tube, and the distance between the annular baffle and the insertion end gradually increases from the outer circle part to the inner circle part of the annular baffle.

In summary, the present invention includes at least one of the following beneficial technical effects:

1. During use, a solid support system can be constructed above the goaf area through supporting piles and steel frames. Even if collapse and deformation are found in the goaf area, it is not easy to cause a major impact on the target tunnel, so that the target tunnel can be safer and more reliable in use. At the same time, the steel pipe is connected to the steel frame, so that a support system can be formed between the steel pipe and the steel frame, ensuring that the soil layer above the goaf area is connected to the steel frame and the steel pipe as a whole, so that the soil layer above the goaf area is not easy to collapse, etc., ensuring that the supporting structure of the supporting piles and steel pipes is not affected, greatly improving the safety of the tunnel in use;

2. During grouting, the high-strength wire can be driven by the slurry to the gaps in the soil layer and other locations. At the same time, the high-strength wire itself is wavy. Therefore, when the slurry solidifies, the high-strength wire, the soil layer and the slurry will form a whole. If local collapse or overall collapse occurs, the collapsed soil will be able to drive the wire to move, thereby triggering the detection device and reminding the maintenance personnel to monitor and survey, to ensure the safety of the target tunnel in subsequent use and avoid hidden dangers at the bottom of the target tunnel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the cross-sectional structure of an embodiment of the present application along a direction perpendicular to the central axis of a target tunnel.

FIG2 is a schematic diagram of the cross-sectional structure of an embodiment of the present application along the central axis of the target tunnel.

Figure 3 is a schematic diagram of the structure of the steel flower tube.

FIG. 4 is a partial enlarged schematic diagram of portion A in FIG. 3 .

FIG. 5 is a partial enlarged schematic diagram of portion B in FIG. 3 .

FIG. 6 is a schematic diagram of the structure of an embodiment of the present application.

In the figure, 1. support pile; 2. steel frame; 3. steel flower pipe; 31. insertion end; 32. grouting end; 4. slurry outlet hole; 5. conduit; 6. connecting hole; 7. pull wire; 8. detection device; 81. shell; 82. sliding plate; 83. elastic member; 9. block; 91. arc surface; 10. high-strength wire; 11. sealing plug; 12. partition plug; 13. through hole; 14. first conductive part; 15. second conductive part; 16. aluminum wire; 17. support rod; 18. annular baffle; 19. grouting interface pipe; 20. air pressure groove; 21. knot.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings.

In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

In the description of the embodiments of the present application, words such as "for example" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "for example" or "for example" is intended to present related concepts in a specific way.

In the description of the embodiments of the present application, the meaning of the term "multiple" refers to two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

The problem that this application needs to solve is how to reinforce the target tunnel in a terrain environment with a mined-out area below the target tunnel, so that the target tunnel can be more stable in subsequent use and reduce safety hazards in the use of the target tunnel.

1 and 2, a coal seam goaf tunnel initial reinforcement and support system disclosed in the present invention comprises a support pile 1, a steel frame 2 and a steel flower pipe 3. The support pile 1 is located below the target tunnel to be supported, and the lower end of the support pile 1 is inserted into the soil layer below the goaf area. In this embodiment, there are multiple support piles 1, and the steel frame 2 is fixed on the support pile 1. The steel frame 2 provides support for the lower part of the target tunnel. During use, a support structure similar to a bridge can be formed below the target tunnel through the support pile 1 and the steel frame 2, thereby ensuring the safety of the target tunnel during use. Most of the forces acting on the target tunnel during use are transmitted to the soil layer below the goaf area through the steel frame 2 and the support pile 1. During use, the soil layer below the target tunnel and above the goaf area is subjected to less force, so the soil layer above the goaf area is not prone to collapse. At the same time, even if the soil layer above the goaf area collapses, the target tunnel will not collapse due to the support of the support pile 1 and the steel frame 2, thereby ensuring the safety of the target tunnel during use.

In order to further reinforce the soil layer above the goaf area and avoid the collapse of the soil layer above the goaf area due to vibration and other reasons after the traffic is opened, the steel pipe 3 is evenly distributed in the soil layer below the target tunnel. The steel pipe 3 includes an insertion end 31 and a grouting end 32. A number of grouting holes 4 are evenly distributed on the steel pipe 3. When in use, a hole is drilled in the soil layer below the target tunnel by a drilling device. When drilling, it is necessary to ensure that the depth of the hole extends into the soil layer below the goaf area by at least 1-2 meters. After that, the broken particles in the hole are blown out by gas, and then the steel pipe 3 is inserted into the hole. When the steel pipe 3 is inserted , insert the insertion end 31 into the hole. When the steel flower pipe 3 is inserted into place, fix the grouting end 32 of the steel flower pipe 3 on the steel frame 2. In this embodiment, the steel flower pipe 3 is welded to the steel frame 2. Then, slurry can be injected into the steel flower pipe 3 and pressurized until it meets the specified requirements. During this process, the slurry will enter the soil layer through the gaps in the soil layer and reinforce the soil layer, so that the steel flower pipe 3 and the soil layer are combined into a whole, so that the soil layer is not easy to collapse, etc. The steel flower pipe 3 can further support the steel frame 2, thereby further improving the safety of the target tunnel.

3 and 4, since the tunnel is a permanent building and is used for a very long time, it is necessary to detect the tunnel structure from time to time during use. In order to facilitate the detection of the soil layer below the target tunnel, in this embodiment, a conduit 5 is provided in the steel flower pipe 3, and the axis of the conduit 5 is along the axis of the steel flower pipe 3. The conduit 5 is hollow, one end of the conduit 5 is located at the grouting end 32, and the other end of the conduit 5 is close to the insertion end 31. A connecting hole 6 is provided on the steel flower pipe 3, and one end of the conduit 5 close to the insertion end 31 is connected to the connecting hole 6. In other embodiments, the connecting hole 6 is located close to the grouting end 32. One of the grouting holes near the insertion end 31 has a pull wire 7 placed in the catheter 5 when in use. In this embodiment, the pull wire 7 is formed by hinged high-strength nylon threads. In order to improve the stability of the pull wire 7, glue or the like can be added when the high-strength nylon threads are hinged to prevent the twisted high-strength nylon threads from being easily dispersed. Both ends of the catheter 5 are opened, and the pull wire 7 is inserted into the catheter 5 from one end of the catheter 5, and the end of the pull wire 7 inserted into the catheter 5 is passed out from the other end of the catheter 5. The end of the pull wire 7 located at the grouting end 32 is connected to a detection device 8, and the end of the pull wire 7 located near the insertion end 31 is connected to a stopper 9.

Among them, in this embodiment, the block 9 can be made of rubber, and an arc surface 91 is set on the block 9. The arc surface 91 is used to fit with the outer wall of the steel flower tube 3. The position of the block 9 can be limited by the arc surface 91. When in use, the block 9 can be fitted on the outer wall of the steel flower tube 3 and the connecting hole 6 is blocked by tightening the pull wire 7. At this time, the arc surface 91 just fits with the outer wall of the steel flower tube 3, thereby preventing the slurry from entering the connecting hole 6; in order to further prevent the slurry from entering the connecting hole 6 through the connecting hole 6, a partition plug 12 is provided in the connecting hole 6, and a through hole 13 is provided on the partition plug 12. The pull wire 7 passes through the through hole 13 to pass out of the connecting hole 6. In this embodiment, the partition plug 12 is made of rubber material, and the pull wire 7 and the partition plug are The blocking plugs 12 have an interference fit, and the gap between the pull wire 7 and the connecting hole 6 can be sealed by the blocking plug 12; in the present embodiment, the pull wire 7 passes through the block 9, and there is an interference fit and a sealing fit between the pull wire 7 and the block 9, and the pull wire 7 passes through the block 9 exactly at the center of the arc surface 91, and a knot 21 is provided on the pull wire 7 at the end of the block 9 away from the arc surface 91, and the knot 21 is formed by knotting the pull wire 7, and the block 9 can be pulled by the pull wire 7 to be tightly attached to the steel flower tube 3 through the knot 21. At the same time, in the present embodiment, an air pressure groove 20 is provided around the pull wire 7 on the arc surface 91, and when the block 9 is attached to the outer wall of the steel flower tube 3, the air pressure groove 20 will be between the block 9 and the outer wall of the steel flower tube 3. When injecting slurry into the steel flower pipe 3, a certain amount of gas can be pumped into the air pressure groove 20 through the conduit 5, so that the air pressure groove 20 has a certain positive pressure, further preventing the slurry from entering through the block 9 and the steel flower pipe 3. At the same time, the air tightness between the block 9 and the steel flower pipe 3 can also be verified by the design of the air pressure groove 20. If the gas in the conduit 5 cannot be guaranteed to be greater than the atmospheric pressure after the gas is injected, it indicates that there is a gap between the block 9 and the steel flower pipe 3. Before installing the steel flower pipe 3, the baffle plug 12 can be removed and the air tightness between the block 9 and the steel flower pipe 3 can be tested. It can be used only after meeting the requirements, thereby avoiding the situation where the pull wire 7 and the conduit 5 cannot slide when the slurry enters the conduit 5.

Referring to Figures 3 and 4, at the same time, in order to allow the end of the pull wire 7 outside the connecting hole 6 to be integrated with the soil layer, a number of high-strength wires 10 are connected to the block 9, and the high-strength wires 10 are wavy. In this embodiment, at least part of the high-strength wires 10 are tied with knots (not shown in the figure). During the grouting process, the high-strength wires 10 will enter the gaps and other parts of the soil layer driven by the slurry. When the slurry solidifies, the high-strength wires 10 will be tightly connected with the soil layer. When the soil layer collapses, the high-strength wires 10 will be pulled, so that the pull wire 7 is pulled, and the detection device 8 located at the other end of the pull wire 7 will be triggered. The triggering of the detection device 8 can determine the soil layer condition above the goaf area, so that when the soil layer collapses, the target tunnel can be inspected and judged in time to avoid subsequent use risks.

In this embodiment, the high-strength wire 10 is integrally arranged with the pulling wire 7, and the stopper 9 can slide between the pulling wire 7, so that the pulling wire 7 can be pulled to move when the high-strength wire 10 is subjected to a large force. The material of the high-strength wire 10 is high-strength nylon wire. It is mentioned above that the pulling wire 7 is formed by hinged high-strength nylon wire. When twisting, one end of the pulling wire 7 is not twisted to form the high-strength wire 10. At the same time, it is mentioned above that in order to be able to pull the stopper 9 to fit on the steel flower tube 3, a knot 21 is tied on the pulling wire 7, and the knot 21 can also be used to transition the twisted part and the untwisted part of the pulling wire 7.

In order to facilitate the high-strength wire 10 to pull the pull rope, the connection between the catheter 5 and the connecting hole 6 is set to an arc transition, and the tangent direction of the arc segment of the catheter 5 at the connecting hole 6 is made to form an acute angle with the axial direction of the steel flower tube 3, that is, as shown in Figure 4, the connection between the catheter 5 and the connecting hole 6 is inclined downward, so that more force can be transmitted to the detection device 8 through the pull rope.

3 and 4, when drilling a hole in the soil layer, the diameter of the hole will be larger than the diameter of the steel flower pipe 3. Therefore, when the steel flower pipe 3 is inserted, the steel flower pipe 3 may fit the inner wall of the hole. At this time, during grouting, there will be more slurry on one side of the hole and less slurry on the other side, which is not conducive to force. For this reason, a support rod 17 is provided on the steel flower pipe 3. In this embodiment, there are multiple support rods 17. There are at least three support rods 17 distributed along the circumference of the steel flower pipe 3, and there are at least two groups of support rods 17 distributed along the length direction of the steel flower pipe 3. The support rods 17 can ensure that the steel flower pipe 3 is near the center of the hole in the soil layer. Since the hole wall may be scratched during the insertion of the steel flower tube 3, thereby generating some broken soil slag, an annular baffle 18 is provided on the side of the steel flower tube 3 close to the insertion end 31, and the annular baffle 18 surrounds the steel flower tube 3, and at the same time, the distance between the annular baffle 18 and the insertion end 31 gradually increases from the outer ring part to the inner ring part of the annular baffle 18, so that the annular baffle 18 forms an arc surface or inclined surface with an outer circumference inclined downward, and when the broken soil slag falls, it slides along the annular baffle 18 and finally falls from the annular baffle 18. The gap between the plate 18 and the hole on the soil layer enters the bottom of the hole. When the steel flower pipe 3 is inserted into place, the crushed soil residue will be located between the annular baffle plate 18 and the bottom wall of the hole. When injecting slurry, it is not easy for the crushed soil residue to be impacted to cover the surrounding of the steel flower pipe 3, thereby avoiding the crushed soil residue from affecting the solidification of the slurry in the soil layer above the goaf area. During the grouting process, the crushed soil residue will combine with the slurry and solidify between the annular baffle plate 18 and the bottom wall of the hole on the soil layer. This place is located below the goaf area and will not have a significant impact on the stability of the goaf area.

5 and 6, the detection device 8 includes a shell 81 and a sliding plate 82. The shell 81 is fixed on the steel frame 2, and the side wall of the shell 81 is provided with a hole for inserting one end of the guide tube 5 located at the grouting end 32. The sliding plate 82 is slidably arranged in the shell 81 along the length direction of the steel flower tube 3. An elastic member 83 is arranged between the sliding plate 82 and the shell 81. The elastic member 83 makes the sliding plate 82 always have a tendency to move toward the side away from the insertion end 31. In this embodiment, the elastic member 83 is a spring, one end of the spring is connected to the sliding plate 82, and the other end of the spring is connected to the shell 81. In this embodiment, the pull wire 7 is inserted into the shell body 81 and connected with the sliding plate 82. A first conductive part 14 is provided on the shell body 81, and a second conductive part 15 is provided on the sliding plate 82. An aluminum wire 16 is connected between the first conductive part 14 and the second conductive part 15. The aluminum wire 16 is located on the side of the sliding plate 82 away from the insertion end 31. When the pull wire 7 is pulled, the pull wire 7 will pull the sliding plate 82 to slide, so that when the force exceeds the bearing capacity of the aluminum wire 16, the aluminum wire 16 will be disconnected. At this time, the first conductive part 14 and the second conductive part 15 will be disconnected. In subsequent use, by connecting the wires to the outside world on the first conductive part 14 and the second conductive part 15, it is possible to judge whether the aluminum wire 16 is disconnected by the connectivity of the wires, thereby judging whether the soil layer has collapsed. In order to avoid the situation where the aluminum wire 16 cannot be broken, in the present embodiment, the diameter of the aluminum wire 16 is relatively small, and the tension that the aluminum wire 16 can withstand is less than the tension borne by the pulling wire 7. In order to further facilitate the pulling of the aluminum wire 16, the length of the aluminum wire 16 in the present embodiment is greater than the distance between the first conductive part 14 and the second conductive part 15. In this way, when the soil layer collapses and the pulling wire 7 pulls the slider to slide, since the length of the aluminum wire 16 is greater than the distance between the first conductive part 14 and the second conductive part 15, the sliding plate 82 will slide a certain distance before the aluminum wire 16 is straightened. At this time, the sliding plate 82 already has a certain speed, so the aluminum wire 16 can be easily broken, thereby improving the sensitivity of the entire detection device 8.

In the present application, there are multiple steel flower tubes 3, and multiple steel flower tubes 3 are distributed along the central axis direction of the target tunnel, and multiple steel flower tubes 3 are distributed along the width direction of the target tunnel. The support effect on the target tunnel is improved by the distributed steel flower tubes 3. In order to improve the detection effect of soil collapse, in this embodiment, the connection holes 6 on different steel flower tubes 3 are at different distances from the insertion end 31, so that the soil layers at different depths above the goaf area can be monitored. In specific use, the conduit 5 and other components can also be provided in only some of the steel flower tubes 3, or the conduit 5 and other components can be provided in all of the steel flower tubes 3, and the steel flower tubes 3 provided with the conduit 5 are evenly distributed below the target tunnel.

In order to facilitate grouting and protect the shell 81, a sealing plug 11 is provided in the steel tube 3 at the grouting end 32. The sealing plug 11 is provided with a hole for the conduit 5 to pass through. After the conduit 5 passes through the hole and is inserted into the shell 81, the gap between the inner wall of the steel tube 3 at the grouting end 32 and the outer wall of the conduit 5 can be sealed by the sealing plug 11, and a grouting interface pipe 19 is connected to the side wall of the steel tube 3. The connection between the grouting interface pipe 19 and the steel tube 3 is located on the steel tube 3 between the sealing plug 11 and the insertion end 31. When it is used specifically, a hole is first punched in the soil layer, and then the steel tube 3 is inserted into the hole, and the steel tube 3 is welded to the steel frame 2, and then the shell 81 is placed in the grouting end 32 of the steel tube 3, and one end of the conduit 5 is inserted into the shell 81, and the shell 81 is welded to the steel frame 2 and the steel tube 3 respectively.

The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An initial reinforcement and support system for a coal seam goaf tunnel, characterized by comprising: A support pile (1) is supported in a mined area below a target tunnel, one end of the support pile (1) passes through the mined area and is located below the mined area, and the other end of the support pile (1) is used to support the target tunnel; A steel frame (2) is arranged on the supporting pile (1), and the steel frame (2) is used to support the target tunnel; A steel flower pipe (3) is arranged below the target tunnel and one end of which is used to be connected to the steel frame (2). The steel flower pipe (3) comprises an insertion end (31) and a grouting end (32). The insertion end (31) passes through the goaf area and is located below the goaf area. The steel flower pipe (3) is provided with a grouting hole (4). The grouting end (32) is used to connect a grouting pipeline. A guide tube (5) is arranged inside the steel flower pipe (3). A connecting hole (6) is arranged on the steel flower pipe (3). The connecting hole (6) connects the inside and outside of the steel flower pipe (3). One end of the conduit (5) is located at the grouting end (32), the other end of the conduit (5) is connected to the connecting hole (6), and the connecting point between the conduit (5) and the connecting hole (6) is located inside the steel flower tube (3), a pull wire (7) is arranged inside the conduit (5), the pull wire (7) passes through the connecting hole (6) and goes out of the steel flower tube (3), one end of the pull wire (7) located at the grouting end (32) is detachably connected to a detection device (8) for detecting the tension applied to the pull wire (7), the detection device (8) comprising a A housing (81) is provided on the housing (81), the housing (81) is communicated with one end of the conduit (5) located at the grouting end (32), a sliding plate (82) is provided in the housing (81), the sliding plate (82) is slidably provided in the housing (81) along the direction from the grouting end (32) to the insertion end (31), an elastic member (83) is provided between the sliding plate (82) and the housing (81) for enabling the sliding plate (82) to always move toward the side away from the insertion end (31), the pull wire (7) is connected to the sliding plate (82) A first conductive part (14) is arranged in the shell (81), a second conductive part (15) is arranged on the sliding plate (82), an aluminum wire (16) is connected between the first conductive part (14) and the second conductive part (15), and a conductive wire is connected to the first conductive part (14) and the second conductive part (15), when the pull wire (7) is subjected to a certain pulling force, the sliding plate (82) will slide toward the insertion end (31), and when the sliding plate (82) slides a certain distance, the aluminum wire (16) will be broken. 2. The initial reinforcement and support system for coal seam goaf tunnels according to claim 1 is characterized in that the connection between the conduit (5) and the connecting hole (6) is transitioned through an arc, and the tangent direction of the arc segment of the conduit (5) at the connecting hole (6) is at an acute angle to the axial direction of the steel pipe (3). 3. The initial reinforcement and support system for coal seam goaf tunnels according to claim 1 or 2 is characterized in that one end of the pull wire (7) located outside the steel flower pipe (3) is connected to a block (9), and the block (9) includes at least one curved surface (91) for fitting with the outer wall of the steel flower pipe (3). 4. The initial reinforcement and support system for coal seam goaf tunnels according to claim 3 is characterized in that the pull wire (7) is set through the block (9) from the curved surface (91), the block (9) is slidably connected to the pull wire (7), and one end of the pull wire (7) passing through the block (9) is connected to a plurality of scattered high-strength wires (10), the high-strength wires (10) are wavy, and the pull wire (7) is tied with a knot (21) on the side of the block (9) away from the curved surface (91). 5. The initial reinforcement and support system for coal seam goaf tunnel according to claim 1 is characterized in that the grouting end (32) is provided with a sealing plug (11), and the sealing plug (11) is provided with a hole for the conduit (5) to pass through, and the sealing plug (11) is used to seal the space between the inner wall of the steel flower pipe (3) and the outer wall of the conduit (5), and the steel flower pipe (3) is provided with a grouting interface pipe (19), and the grouting interface pipe (19) is connected to the interior of the steel flower pipe (3), and the internal connection between the grouting interface pipe (19) and the steel flower pipe (3) is located on the steel flower pipe (3) between the sealing plug (11) and the insertion end (31). 6. The initial reinforcement and support system for coal seam goaf tunnels according to claim 1 is characterized in that a baffle plug (12) is provided at the connecting hole (6), and a through hole (13) for the pull wire (7) to pass through is provided on the baffle plug (12), and an interference fit is formed between the pull wire (7) and the through hole (13). 7. The initial reinforcement and support system for coal seam goaf tunnels according to claim 1 is characterized in that there are a plurality of steel flower pipes (3), at least some of which are provided with conduits (5), and when there are a plurality of steel flower pipes (3) with conduits (5), the steel flower pipes (3) with conduits (5) are evenly distributed below the target tunnel, and the lengths of the conduits (5) in different steel flower pipes (3) are different. 8. The initial reinforcement and support system for coal seam goaf tunnel according to claim 1 is characterized in that a support rod (17) is arranged outside the steel flower pipe (3), and an annular baffle (18) is arranged on the side of the steel flower pipe (3) close to the insertion end (31), and the annular baffle (18) surrounds the steel flower pipe (3), and the distance between the annular baffle (18) and the insertion end (31) gradually increases from the outer circle part to the inner circle part of the annular baffle (18).