Large-span open-off cut layer-crossing tunneling supporting system for passing through old roadway

Abstract

The utility model provides a large-span open-off cut layer-crossing tunneling supporting system passing through an old roadway, the system comprises a pilot tunnel side support and a brush width side support, and the system stretches across from a front wall chute to a rear wall chute through an I-shaped steel beam and is erected on a support road; the I-shaped steel beam spanning from the front wall chute to the bracket way is a first steel beam, and the I-shaped steel beam spanning from the bracket way to the rear wall chute is a second steel beam; the system is provided with single bodies for supporting at the first position to the sixth position. The shed beams of the steel frame shed supported on the pilot tunnel side and the shed beams of the steel frame shed supported on the brush width side are fixed through third steel beams; the roadway of the old roadway is supported by side anchor rods and top anchor rods, and a steel frame shed supported on the pilot tunnel side and a steel frame shed supported on the brush width side are erected below the old roadway; and two single bodies are arranged at the fourth position and the fifth position for advance support. According to the construction method, the hidden danger of a top plate during construction from the lower portion of an open-off cut large-span old roadway is effectively solved by designing the single body erecting position.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mines, and particularly relates to a large-span cut hole through-layer driving support system through an old roadway. BACKGROUND

[0002] In the scene of coal mining and various complex underground engineering operations, driving through a layer from below an old roadway is a very common and challenging operation mode. In the process of coal resource mining, with the continuous expansion of mining depth and width, the transition between different coal seams occurs frequently. For example, when the mining of a coal seam is close to the end, it needs to be connected to the adjacent or lower coal seam for continuous mining. In order to realize safe and efficient mining connection, it is often necessary to drive through a layer from below the existing old roadway to open a channel to the new target layer. Or when expanding the underground operation space and opening a new operation area, due to the restriction of geological conditions, existing roadway layout and other factors, it is also necessary to choose to drive through a layer from below the existing old roadway.

[0003] The surrounding rock mass of the old roadway has undergone multiple stress releases and redistributions and has been strongly disturbed by mining in the long-term mining activities. The internal structure of the rock mass is destroyed, the integrity is reduced, the mechanical properties are significantly changed, and the stress state becomes extremely complex. Under such complex geological conditions, when driving through a layer from below the old roadway, the surrounding rock of the roadway is prone to deformation, collapse and other problems. Therefore, reliable and effective support measures must be taken to ensure the safe operation of the driving operation. Shed support has become one of the widely used support methods in such operations due to its relatively simple operation and good adaptability to different geological conditions.

[0004] In the construction of large-section roadways, cut holes are typical representatives. Limited by geological conditions, construction equipment and technology and other factors, the cut hole cannot be excavated to the designed full width at one time. According to the existing technical process, shed construction will be carried out on the side of the guide chamber first to lay a foundation for the subsequent width brushing operation. After the shed construction on the side of the guide chamber is completed, the width brushing work is gradually carried out. In the construction process of the traditional technology, although it has been fully realized that the front and rear wall sliding ways and the support way in the middle of the cut hole need to be reserved, however, in the actual field operation, many problems cannot be ignored are exposed.

[0005] However, the prior art has many problems, and the location of the monomer is also unreasonable. The unreasonable location of the monomer cannot form an efficient support system between the monomer support and the shed beam. In the brush width operation of a certain metal mine roadway, due to the improper arrangement of the monomer, the stress distribution of the support structure in some areas is extremely uneven when bearing the surrounding rock pressure. Through the pressure monitoring equipment detection, the pressure borne by part of the monomer exceeds 30% of its designed bearing capacity, while the shed beam in the adjacent area does not fully play the bearing role, resulting in serious deformation of the surrounding rock of the roadway during the brush width process. The convergence of the two sides of the roadway reaches 300mm in a short time, and the roof subsidence also exceeds 150mm, which seriously affects the stability of the roadway and poses a great threat to the subsequent safe operation. Practical new type content

[0006] The application provides a large-span cut hole through layer driving support system through an old roadway, which solves the problems of hidden dangers of the roof during the construction of the large-span cut hole under the old roadway in the prior art, and large workload of roof maintenance during the installation of the cut hole in the later period.

[0007] The application provides a large-span cut hole through layer driving support system through an old roadway, which includes a guide chamber side support and a brush width side support. The system crosses from the front wall chute to the rear wall chute through the I-beam and is erected on the support channel. The I-beam crossing from the front wall chute to the support channel is the first steel beam, and the I-beam crossing from the support channel to the rear wall chute is the second steel beam. The system is provided with a monomer at the first position to the sixth position for support;

[0008] The guide chamber side support is located at the front wall chute and the support channel, and includes a steel frame shed and two side supporting monomers.

[0009] The brush width side support is located at the rear wall chute, and includes a steel frame shed and two monomers. The shed beam of the steel frame shed of the guide chamber side support and the shed beam of the steel frame shed of the brush width side support are fixed through the third steel beam.

[0010] The roadway of the old roadway is supported by the roadway through anchor rod and top anchor rod, and the guide chamber side support and the brush width side support are erected under the old roadway.

[0011] Two monomers are provided at the fourth position and the fifth position for advanced support, wherein the fifth position is arranged below the first steel beam, and the monomer at the fourth position is arranged between the two rows of steel belts of the system.

[0012] In some possible implementation manners, the length of the I-beam of the brush width side support is greater than the sum of the length of the support channel and the length of the rear chute.

[0013] In some possible implementation manners, the third steel beam is a U-shaped steel beam.

[0014] In some possible implementation manners, the first steel beam is supported by a single support at the third position and the sixth position.

[0015] In some possible implementation manners, the second steel beam is supported by a single support at the first position and the fourth position.

[0016] In some possible implementation manners, the two single supports arranged on the brush width side are advanced single supports, one of which is arranged on the shed beam of the guide arch side support shed, and the other of which is temporarily arranged.

[0017] In some possible implementation manners, the second steel beam is fixedly connected by a π-shaped steel at the second position.

[0018] It can be known from the above that the application provides a large-span cut hole through layer driving support system through an old roadway, which includes guide arch side support and brush width side support. The system is crossed from the front wall chute to the rear wall chute by the I-shaped steel beam and is arranged on the support chute. The I-shaped steel beam crossed from the front wall chute to the support chute is the first steel beam, and the I-shaped steel beam crossed from the support chute to the rear wall chute is the second steel beam. The system is provided with a single support at the first position to the sixth position. The shed beam of the guide arch side support shed and the shed beam of the brush width side support shed are fixed by the third steel beam. The roadway of the old roadway is supported by the roof anchor and the top anchor, and the guide arch side support shed and the brush width side support shed are arranged below the old roadway. Two single supports are arranged at the fourth position and the fifth position for advanced support. The application accurately designs the single support position, meets the layout requirements of the three single supports of the cut hole, successfully reserves the front wall chute, the rear wall chute and the cut hole middle support chute space. The application effectively solves the roof hidden danger when the large-span cut hole is constructed from below the old roadway. The reasonable single support position makes the whole support system more stable, can better bear the roof pressure, avoids the roof instability problem caused by unreasonable space layout, and ensures the construction safety. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The structure schematic diagram of the large-span cut hole through layer driving support system through the old roadway in the embodiments provided by the application is shown.

[0021] Illustration: 1-first steel beam; 2-second steel beam; 3-single support; 4-third steel beam; 5-roof anchor; 6-top anchor; 7-steel belt; 8-π-shaped steel. Detailed Implementation

[0022] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0023] During long-term mining operations, the surrounding rock mass of the old tunnel has undergone multiple stress releases and redistributions, resulting in severe mining disturbances. The internal structure of the rock mass has been damaged, its integrity reduced, and its mechanical properties significantly altered, leading to an extremely complex stress state. Under these complex geological conditions, when excavating through layers beneath the old tunnel, the surrounding rock is highly susceptible to deformation and collapse. Therefore, reliable and effective support measures must be implemented to ensure the safe progress of tunneling operations. Frame support, with its relatively simple operation and adaptability to various geological conditions, has become one of the widely used support methods in such operations.

[0024] In the construction of large-section tunnels, the cut-in is a typical example. Due to limitations in geological conditions, construction equipment, and processes, the cut-in cannot be excavated to the full design width in one go. According to existing technical procedures, scaffolding is usually constructed first on the side of the pilot tunnel to lay the foundation for subsequent widening operations. After the scaffolding on the pilot tunnel side is completed, the widening work is carried out gradually.

[0025] However, existing technologies have many problems, and the placement of individual support structures is also unreasonable. Inappropriate placement prevents the formation of a cohesive and efficient support system between the individual support pillars and the supporting beams. During a widening operation in a metal mine roadway, due to improper placement of individual support structures, the stress distribution in some areas of the support structure was extremely uneven when subjected to surrounding rock pressure. Pressure monitoring equipment revealed that some individual support structures were bearing pressure exceeding their design capacity by 30%, while the supporting beams in adjacent areas did not fully perform their load-bearing function, leading to severe deformation of the surrounding rock during the widening process. The convergence of the roadway sides reached 300mm in a short period, and the roof subsidence exceeded 150mm, seriously affecting the stability of the roadway and posing a significant threat to subsequent safe operations.

[0026] Based on this, to address the potential hazards of the roof slab during large-span excavation from below the old tunnel using existing technologies, and the significant amount of roof slab maintenance required during later installation, such as... Figure 1 As shown, this application provides a support system for large-span cut-through tunneling through old roadways. The system includes guide tunnel side support and shaving side support. The system is constructed by I-beams spanning from the front wall chute to the rear wall chute and erected on the support track. Figure 1Wherein, x, y, z are the front wall chute, support channel and rear wall chute respectively; Figure 1 Wherein, A, B are the adit side and brush width side respectively. Among them, the I-beam from the front wall chute to the support channel is the first steel beam 1, and the I-beam from the support channel to the rear wall chute is the second steel beam 2. The system is provided with a single body 3 at the first to sixth positions respectively for support Figure 1 Wherein, a, b, c, d, e, f are the first position, the second position, the third position, the fourth position, the fifth position and the sixth position respectively.

[0027] The first position is located at the brush width side, below the second steel beam 2 from the support channel to the rear wall chute, responsible for supporting the second steel beam 2. During brush width operation, the single body at this position cooperates with the single bodies at other positions to ensure the stability of the second steel beam 2, thereby maintaining the stability of the top plate on the brush width side and ensuring the safety of the rear wall chute area construction.

[0028] The second position is near the fixed connection point of the second steel beam 2 and the π-shaped steel 8, which may be close to the rear wall chute side. Although its direct support role is not explicitly stated, it participates in the connection of the second steel beam 2 and the surrounding support structure, enhancing the overall support stability.

[0029] The third position is on the adit side, below the first steel beam 1 from the front wall chute to the support channel, used to support the first steel beam 1. During the adit side shed support, it shares the roof pressure borne by the first steel beam 1 and cooperates with the single body at position 6 to maintain the stability of the first steel beam 1, ensuring the safety of the roof in the front wall chute and support channel areas.

[0030] The fourth position is used for advanced support before brush width operation, supported between the two rows of steel belts 7 of the system. During brush width operation, it continues to support the second steel beam 2, plays a role in advanced support, controls the roof deformation in advance, facilitates subsequent support modification operation, and ensures the smooth progress of brush width construction.

[0031] The fifth position is used for advanced support before brush width operation, located below the first steel beam. The single body at this position reinforces the roof in advance, enhances the stability of the first steel beam 1, creates safe conditions for brush width operation, and also participates in the support of the entire support system to the roof during the brush width process.

[0032] The sixth position is located on the adit side, below the first steel beam 1, and cooperates with the single body at position 3 to support the first steel beam 1. In the adit side support, it plays a key role in maintaining the stability of the first steel beam 1 and ensuring the safety of the roof on the adit side, and is an important support point for the adit side shed support.

[0033] The adit side support is located in the front wall chute and the support channel, and the adit side support includes a steel shed and single bodies 3 on both sides;

[0034] The brush width side support is located in the rear wall chute, and the brush width side support comprises a steel frame shed and two single bodies; wherein the shed beam of the steel frame shed arranged on the guide chamber side and the shed beam of the steel frame shed arranged on the brush width side are fixed by a third steel beam 4;

[0035] The old roadway is supported by the roadway side anchor rod 5 and the roof anchor rod 6, and the guide chamber side steel frame shed and the brush width side steel frame shed are arranged below the old roadway;

[0036] Two single bodies 3 are arranged at the fourth position and the fifth position for advanced support, wherein the fifth position is arranged below the first steel beam, and the single body at the fourth position is arranged between the two rows of steel belts 7 of the system.

[0037] Before the large-span cut-through layer tunneling support system is built, the old roadway is supported by the roadway side anchor rod 5 and the roof anchor rod 6. The roadway side anchor rod 5 is arranged along the sidewall of the old roadway, and the one end of the anchor rod is anchored into the rock mass, and the other end is fixed to the sidewall of the roadway, so as to constrain the deformation of the sidewall rock mass of the roadway and prevent the roof fall accident. The roof anchor rod 6 is arranged perpendicular to the roof of the old roadway, and is deeply arranged in the roof rock mass, so as to connect the broken rock mass of the roof with the stable rock mass in the deep part, utilize the anchoring force of the deep rock mass to support the roof, and maintain the stability of the old roadway, so as to create a relatively stable foundation condition for the subsequent cut-through tunneling and support construction under the old roadway.

[0038] The guide chamber side support is located in the front wall chute and the support channel. First, the steel frame shed is installed, which is composed of a frame structure of steel beams and steel columns and has high strength and bearing capacity. The steel beam serves as a shed beam and covers the front wall chute and the support channel above to provide direct support for the roof; the steel column is arranged on both sides to transfer the pressure of the shed beam to the roadway floor to form a stable support structure.

[0039] Single bodies 3 are arranged on both sides of the guide chamber side steel frame shed for support. The single body 3 is a single hydraulic prop, which has the characteristics of adjustable height and support force. By adjusting the height of the single body 3, the top is tightly supported on the shed beam of the steel frame shed, and the bottom is stably supported on the roadway floor. The single bodies 3 arranged at the third position and the sixth position play a key supporting role for the first steel beam 1, share the roof pressure, prevent the first steel beam 1 from deforming and sinking, and ensure that the guide chamber side support can effectively support the roof to ensure the safety of the construction in the front wall chute and the support channel area.

[0040] Before the cut-through is expanded, two single bodies 3 are arranged at the fourth position and the fifth position for advanced support. The single body 3 at the fifth position is arranged below the first steel beam to directly provide additional support for the first steel beam 1 and enhance its stability; the single body 3 at the fourth position is arranged between the two rows of steel belts 7, which on the one hand provides advanced support for the roof of the area to be expanded, and on the other hand facilitates the subsequent support operation in the construction. The two advanced single bodies 3 reinforce the roof in advance, effectively control the deformation of the roof, and create safe conditions for the expansion operation.

[0041] The brush width side support is located in the back wall chute. A second steel beam 2 is installed from the support chute to the back wall chute, and a single body 3 is arranged at the first position and the fourth position to fix and support the second steel beam 2. The first position single body 3 provides initial stable support for the second steel beam 2, and the fourth position single body 3 continues to support the second steel beam 2 based on the advance support, ensuring that the second steel beam 2 can effectively cover the back wall chute and part of the support chute area, providing reliable support for the roof of the area and preventing the roof from collapsing.

[0042] The brush width side support also includes a steel shed and two single bodies. The shed beam of the steel shed is fixed with the shed beam of the steel shed on the guide arch side through the third steel beam 4, which enhances the integrity and stability of the entire support system. One of the two single bodies is supported on the shed beam of the steel shed on the guide arch side to provide additional support for the roof, and the other is temporarily supported and can be flexibly adjusted in position according to the roof condition on site to strengthen the support of weak areas and further ensure the safety of the brush width side construction.

[0043] The shed beam of the steel shed on the guide arch side and the shed beam of the steel shed on the brush width side are fixed and connected through the third steel beam 4, so that the entire support system forms an organic whole, improving the overall carrying capacity and stability. At the second position of the second steel beam 2, it is fixed and connected through the π-shaped steel 8, which enhances the connection stability of the second steel beam 2 and the surrounding support structure, makes the stress of the second steel beam 2 more balanced, and can better adapt to complex construction conditions and changes in surrounding rock pressure.

[0044] By accurately designing the single body support position, the layout requirements of the three single bodies in the cut are met, and the front and back wall chutes and the cut middle support chute space are successfully reserved. This design effectively solves the roof hidden danger when the cut is constructed from the bottom of the old lane with large span. The reasonable single body support position makes the entire support system more stable, can better withstand the roof pressure, avoids the problem of roof instability caused by unreasonable space layout, and ensures the safety of construction.

[0045] The length of the I-beam selected for the brush width side is carefully designed to span the support chute and the back chute. This design not only ensures the effectiveness of the support, but also ensures that the single bodies at both ends do not hinder transportation after being set. The I-beam is in the same straight line with other single bodies in the cut, enhancing the integrity and stability of the support structure, making the construction process smoother, and improving the construction efficiency.

[0046] Both the guide arch and the brush width side adopt the way of steel frame shed combined with single support, and the shed beams of the two sides of the steel frame shed are fixed through the third steel beam, forming a whole supporting structure. The supporting stability is greatly enhanced by the cooperation of multiple devices. The reasonable support of the single body at different positions can effectively share the roof pressure and reduce the risk of roof deformation and collapse. Under the old roadway, the steel frame shed and the anchor rod work together to further strengthen the control of the surrounding rock of the roadway, providing a safe working environment for the construction personnel and equipment.

[0047] Two single bodies are arranged at the fourth and fifth positions to provide advanced support, preparing for the brush width operation in advance. The fifth position is arranged below the first steel beam, and the single body at the fourth position is arranged between the two rows of steel belts, which facilitates the subsequent support adjustment operation. Advanced support can effectively control roof deformation and reduce the workload of temporary support during construction, making the brush width operation more smooth. Reasonable single body support position reduces the adjustment and rearrangement of the support structure during construction, improves the construction efficiency, and shortens the construction period.

[0048] In some embodiments, the second steel beam 2 has a length greater than the sum of the lengths of the support track and the back runner track.

[0049] The second steel beam 2 is longer, which can more effectively span the support track and the back runner track, providing a wider support area. This allows the roof to be uniformly supported over a larger area, reducing local stress concentration. In cooperation with the guide arch side support, the entire support system has stronger control over the roof, reducing the likelihood of roof subsidence and deformation, and enhancing the overall stability of the roadway, creating a safer environment for construction. In the complex stress environment under the old roadway, the long steel beam can better disperse the roof pressure and prevent roof collapse accidents caused by insufficient local support.

[0050] In some embodiments, the third steel beam 4 is a U-shaped steel beam.

[0051] The U-shaped beam is used to reinforce the guide arch and the brush width side shed beam, making the entire support structure form a whole, increasing the stability of the support. At the same time, the roof U-shaped beam firmly fixes the I-beam on the roof, effectively reducing the roof maintenance workload during the later installation of the cut. The U-shaped beam is constructed in the direction of the cut at the overlapping position of the I-beam in the cut, further enhancing the stability of the roof and reducing the maintenance cost and safety risk in the later period.

[0052] In some embodiments, the first steel beam 1 is fixed and supported by the single body 3 arranged at the third and sixth positions.

[0053] The monomers 3 at the third and sixth positions play a key supporting role for the first steel beam 1. They share the roof pressure borne by the first steel beam 1, preventing the steel beam from deforming, sinking or displacing due to uneven stress. The stable first steel beam 1 can effectively cover the area from the front wall chute to the support chute, providing reliable support for the roof in this area, ensuring the stability of the roof above the front wall chute and the support chute during the cutting process, avoiding roof collapse, and ensuring construction safety.

[0054] In some embodiments, the second steel beam 2 is fixedly supported by the monomers 3 at the first and fourth positions.

[0055] The second steel beam 2 is responsible for spanning from the support chute to the back wall chute, and the monomers 3 at the first and fourth positions provide stable support to ensure that the steel beam can effectively bear the roof pressure. This allows the second steel beam 2 to provide reliable support for the roof in the covered area, preventing deformation, collapse and other conditions of the roof, maintaining the stability of the roadway, and ensuring the safety of construction personnel and equipment. In the complex stress area below the old roadway, the support of the monomers 3 allows the second steel beam 2 to better adapt to changes in surrounding rock pressure and continue to play a supporting role.

[0056] In some embodiments, the two monomers 3 set on the brush width side are advance monomers, one of which is set on the shed beam of the steel shed set on the guide chamber side, and the other is temporarily set. The other advance monomer is temporarily set near the roof fracture or stress concentration area, and the specific setting position is determined according to the actual situation on site to strengthen the support of the weak area.

[0057] The advance monomer 3 set on the shed beam of the steel shed set on the guide chamber side directly provides additional support to the roof of the area to be brushed. Since the brushing operation changes the stress structure of the roadway, the roof is prone to instability. This advance monomer can share the roof pressure in advance, enhance the load-bearing capacity of the roof, prevent the roof from collapsing due to stress changes during brushing, and provide a safe working environment for construction personnel and equipment. Before brushing, the roof is in a relatively weak state, and the advance monomer set on the shed beam can stabilize the roof in time, reducing safety risks.

[0058] The other temporarily set advance monomer 3 has strong flexibility. During the cutting eye brushing process, according to the actual situation on site, such as the degree of roof fracture, local stress concentration and other problems, the temporarily set monomer can adjust the position and support force at any time. When encountering local roof fracture, temporary monomers can be quickly set near the fracture area to strengthen support. This flexible setting can better adapt to complex and variable geological conditions, optimize the construction process, and improve construction efficiency.

[0059] In some embodiments, the second steel beam 2 is fixedly connected by the π-shaped steel 8 at the second position.

[0060] The second steel beam 2 is fixedly connected by the π-shaped steel 8 at the second position, which can greatly enhance the connection stability of the second steel beam 2 and the surrounding support structure. The π-shaped steel 8 itself has high strength and rigidity, and when used to connect the second steel beam 2, it can tightly combine the second steel beam 2 with other support components. When bearing the roof pressure, the π-shaped steel 8 can effectively transfer and disperse stress, reduce the risk of shaking or displacement of the second steel beam 2, and ensure the stability of the support structure. For example, in areas with large surrounding rock stress, the π-shaped steel 8 can firmly fix the second steel beam 2 to prevent it from loosening due to pressure and ensure reliable support of the roof.

[0061] As can be seen from the above embodiments, the application provides a large-span open-off cut through-layer driving support system through an old roadway. The system includes side support of a guide chamber and side support of a brush width, and a steel beam of the system is horizontally arranged from a front wall chute to a rear wall chute of the old roadway and is arranged on a support channel. The steel beam horizontally arranged from the front wall chute to the support channel is a first steel beam, and the steel beam horizontally arranged from the support channel to the rear wall chute is a second steel beam. The system is provided with a single body for support at the first to sixth positions. The roof beams of the steel frame shed for side support of the guide chamber and the roof beams of the steel frame shed for side support of the brush width are fixed by a third steel beam. The roadway of the old roadway is supported by a rib anchor and a top anchor, and the steel frame shed for side support of the guide chamber and the steel frame shed for side support of the brush width are arranged below the old roadway. Two single bodies are provided at the fourth and fifth positions for advanced support. The application accurately designs the support position of the single body to meet the layout requirements of the three single bodies of the open-off cut, and successfully reserves the space of the front and rear wall chutes and the open-off cut middle support channel. The application effectively solves the roof hidden danger when the large-span open-off cut is constructed from below the old roadway. The reasonable support position of the single body makes the entire support system more stable, can better bear the roof pressure, avoids the roof instability problem caused by unreasonable space layout, and ensures the construction safety.

[0062] The similar parts between the embodiments provided by the application can be referred to each other, and the specific embodiments provided above are only a few examples under the general concept of the application and do not limit the protection scope of the application. Any other embodiments extended by the person skilled in the art without creative labor according to the application scheme are within the protection scope of the application.

Claims

1. A large-span open cut through layer driving support system through an old roadway, characterized in that, The system comprises a guide chamber side support and a brush width side support, and is crossed from a front wall chute to a rear wall chute by an I-beam, and is erected on a support chute; wherein the I-beam from the front wall chute to the support chute is a first steel beam (1), and the I-beam from the support chute to the rear wall chute is a second steel beam (2); the system is provided with a single body (3) at the first position to the sixth position for support; The guide chamber side support is located at the front wall chute and the support chute, and comprises a steel shed and two side supporting single bodies (3); The brush width side support is located at the rear wall chute, and comprises a steel shed and two single bodies; wherein the shed beam of the guide chamber side support and the shed beam of the brush width side support are fixed by a third steel beam (4); The old lane is supported by a help anchor rod (5) and a top anchor rod (6), and the old lane is provided below with a guide chamber side support steel shed and a brush width side support steel shed; Two single bodies (3) are provided at the fourth position and the fifth position for advanced support, wherein the fifth position is provided below the first steel beam, and the single body at the fourth position is supported between the two rows of steel belts (7) of the system.

2. The large-span open-off cut through-formation driving support system through old laneways according to claim 1, characterized in that, The length of the second steel beam (2) is greater than the sum of the length of the support chute and the length of the rear wall chute.

3. The large-span open-off cut through-formation driving support system through old laneways according to claim 1, characterized in that, The third steel beam (4) is a U-shaped steel beam.

4. The large span open cut through entry development and support system through old roadways of claim 1, wherein, The first steel beam (1) is fixed and supported by the single bodies (3) provided at the third position and the sixth position.

5. The longwall crosscut through-cut pass support system of claim 1, wherein, The second steel beam (2) is fixed and supported by the single bodies (3) provided at the first position and the fourth position.

6. The large span open cut through-lane drivage support system through old roadway of claim 1, characterized in that, The two single bodies (3) of the brush width side support are advanced single bodies, one of which is supported on the shed beam of the guide chamber side support steel shed, and the other is temporarily supported.

7. The large span open cut through entry development and support system through old roadways of claim 1, wherein, The second steel beam (2) is fixedly connected at the second position by a π-shaped steel (8).

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