Method of replacing supports during face advance

Abstract

The application provides a method for replacing supports during working face advancing, comprising the following steps: removing push-pull heads of supports corresponding to a working face end and a working face middle part to form a support replacement space, and replacing supports in the support replacement space, wherein a communication roadway is used as a channel for support installation and removal during support replacement. The method for replacing supports during working face advancing provided by the application can make supports gradually lag behind a working face by removing push-pull heads between supports to be replaced and conveyors, form a support replacement space, replace supports in the support replacement space, greatly reduce a support replacement roof control space, and gradually install supports along with working face advancing, so that the supports can be quickly installed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a method for replacing supports during working face advancing. BACKGROUND

[0002] With the development of coal industry technology, the working face of the coal mine has basically realized high yield and high efficiency. Because of the acceleration of the working face advancing speed, the tunneling work is relatively tense, and some mines have appeared the situation of tense or even disordered mining and tunneling connection. In order to reduce the million tons of tunneling amount, avoid the accumulation of harmful gases in the upper corner, relieve the mine pressure problem caused by the section coal pillar, improve the recovery rate of the working face and the safety production guarantee capacity of the mine, in recent years, the gob-side entry retaining technology has been rapidly developed and widely applied. For the working face of medium-thick and thick coal seam, the initial roof pressure strength is large, and before the law of the lagging pressure of the gob-side entry retaining in the coal mine is fully mastered, the starting point of the entry retaining is generally arranged in the middle of the working face, thereby forming the problem of replacing and installing the gob-side entry retaining special support during the working face advancing.

[0003] The current method for replacing and installing the gob-side entry retaining special support is a static installation method, the communication roadway is selected as the support replacement channel, and the flexible net, anchor rod, anchor cable and wood pile are used to support the roof of the goaf in advance. When the tail beam of the support pushes through the support replacement communication roadway, the working face stops mining until the support replacement is completed, and the installation and replacement of the support are carried out between the tail of the support and the wood pile support. At this time, the support replacement space needs more than 10 times the support area, and the required support replacement space is large. SUMMARY

[0004] The present application provides a method for replacing supports during working face advancing, which solves the defect that the support replacement space needs more than 10 times the support area and the required support replacement space is large in the prior art.

[0005] The present application provides a method for replacing supports during working face advancing, which solves the defect that the support replacement space needs more than 10 times the support area and the required support replacement space is large in the prior art.

[0006] The push-pull heads of the supports corresponding to the end of the working face and the middle of the working face are removed to form a support replacement space;

[0007] The replacement of the supports is carried out in the support replacement space, wherein the communication roadway is used as the channel for installing and removing the supports during the replacement of the supports.

[0008] According to the method for replacing supports during working face advancing provided by the present application, the replacement of the supports in the support replacement space includes:

[0009] The target support corresponding to the middle of the working face is replaced, and the set tail support is installed;

[0010] After the working face advances by a set distance, the support corresponding to the end of the working face is replaced.

[0011] According to the present invention, a method for replacing a support during the advancement of a working face includes replacing a target support corresponding to the middle of the working face and installing a predetermined tail support, comprising:

[0012] A lateral retaining wall is provided for the target support based on a support in the middle of the working face;

[0013] If the conveyor head of the working face reaches the target position, replace the target support corresponding to the middle of the working face;

[0014] Remove the brackets corresponding to the tail bracket in sequence, and then install the tail bracket.

[0015] According to the present invention, a method for replacing a support during the advancement of a working face is provided, wherein the lag distance of a support in the middle of the working face is less than the lag distance of the target support.

[0016] According to the present invention, a method for changing a support during the advancement of a working face, wherein the working face conveyor head reaches a target position, includes:

[0017] The working face conveyor head reaches a position perpendicular to the tangent of the coal pillar in the section.

[0018] A method for changing a support during face advancement according to the present invention further includes:

[0019] During the process of replacing the target support corresponding to the middle of the working face and installing the set tail support, the top plate of the working face is reinforced and supported based on the first protective net, anchor bolts and anchor cables.

[0020] A method for changing a support during face advancement according to the present invention further includes:

[0021] If the distance between the top beam of the working face and the midpoint of the chamfered corner of the connecting roadway reaches a set value, the top plate of the working face will be reinforced and supported based on the first protective net, anchor bolts and anchor cables.

[0022] According to the present invention, a method for replacing a support during the advancement of a working face includes replacing the support corresponding to the end of the working face after the working face has advanced a set distance.

[0023] After the working face has been advanced a set distance, the brackets corresponding to the end of the working face are replaced in the order of installation followed by removal.

[0024] According to the present invention, a method for replacing supports during the advancement of a working face is provided. During the replacement of the support corresponding to the end of the working face, the top plate of the working face is reinforced and supported based on the second protective net and anchor bolts.

[0025] The method for replacing supports during working face advancing provided by the present application is a method for replacing supports during working face advancing by a set distance, comprising:

[0026] The working face is advanced by a distance greater than the length of the support base.

[0027] The method for replacing supports during working face advancing provided by the present application gradually lags the working face by removing the push-pull head between the support to be replaced and the conveyor, forms a support replacement space, and replaces the support in the support replacement space, greatly reduces the support replacement control space, and can be gradually installed with the working face advancing, thereby achieving rapid installation of the support. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0029] Figure 1 is a flowchart of the method for replacing supports during working face advancing provided by the present application;

[0030] Figure 2 is a flowchart of step S120 in the method for replacing supports during working face advancing provided by the present application; Figure 1

[0031] Figure 3 is a flowchart of step S210 in the method for replacing supports during working face advancing provided by the present application; Figure 2

[0032] Figure 4 is one of the flowcharts of a specific embodiment provided by the present application;

[0033] Figure 5 is the second flowchart of a specific embodiment provided by the present application;

[0034] Figure 6 is the third flowchart of a specific embodiment provided by the present application;

[0035] Figure 7 is the fourth flowchart of a specific embodiment provided by the present application.

[0036] Reference signs:

[0037] ​​1 - coal face, 2 - gateway along goaf, 3 - section coal pillar, 4 - auxiliary roadway, 5 - goaf, 6 - face support, 7 - polyester fiber mesh, 8 - roof reinforcement anchor, 9 - roof reinforcement anchor cable, 10 - welded metal mesh, 11 - conveyor head, 12 - exchange frame communication lane, 13 - fixed mesh steel wire rope. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0043] The application provides a method for replacing supports during working face advancing, comprising:

[0044] S110, removing the push-pull head of the support corresponding to the end of the working face and the middle of the working face to form a support replacement space;

[0045] S120, replacing the support in the support replacement space, wherein the communication roadway is used as a channel for support installation and removal during support replacement.

[0046] Optionally, removing the push-pull head of the support corresponding to the end of the working face and the middle of the working face means sequentially removing the push-pull head of the support corresponding to the end of the working face and the push-pull head of the support corresponding to the middle of the working face during working face advancing.

[0047] Optionally, the number of supports corresponding to the working face can be set according to requirements, which is not limited in the application.

[0048] Optionally, the supports corresponding to the working face can be numbered in order.

[0049] Optionally, the to-be-installed supports can be stored in the underground roadway in advance, and the support replacement is performed by the working face maintenance team, so that dynamic support replacement during working face advancing is realized, the influence on the working face is eliminated, and parallel operation is realized.

[0050] It can be understood that, in the embodiments of the application, the push-pull head between the support to be replaced and the conveyor is removed, the support gradually lags behind the working face, the support replacement space is formed, the support replacement is performed in the support replacement space, the support replacement control roof space is greatly reduced, the support can be gradually installed with the working face advancing, the rapid installation of the support is realized, and the support replacement efficiency and operation safety are greatly improved.

[0051] On the basis of the above-mentioned embodiments, as a preferred embodiment, as shown in Figure 2 the support replacement in the support replacement space comprises:

[0052] S210, replacing the target support corresponding to the middle part of the working face and installing the set tail support;

[0053] S220, replacing the support corresponding to the end of the working face after the working face advances by a set distance.

[0054] Optionally, step S210 is completed within one round.

[0055] Optionally, step S220 is performed during the maintenance shift, without affecting the normal advancement of the working face. The entire support replacement cycle is shortened from the traditional 7 days to 2 days, greatly improving the operation efficiency and having little effect on the working face mining.

[0056] Optionally, the number of target supports is one, and the number of set tail supports is two, including the first gangue blocking support and the second gangue blocking support.

[0057] It can be understood that the embodiments of the present application replace the support through two steps, reduce the influence time of single replacement, use the maintenance shift time of the working face for operation, realize the parallel operation of support replacement and working face mining, avoid mutual interference and the long working face stoppage time caused by one-time replacement, and the problem of roof pressure appearance, which is beneficial to high yield and high efficiency of the working face.

[0058] On the basis of the above-mentioned embodiments, as a preferred embodiment, as shown in Figure 3 the replacement of the target support corresponding to the middle part of the working face and the installation of the set tail support include:

[0059] S310, setting a lateral gangue blocking for the target support based on one support in the middle part of the working face;

[0060] S320, replacing the target support corresponding to the middle part of the working face if the working face conveyor head reaches the target position;

[0061] S330, sequentially removing the supports corresponding to the tail support and installing the tail support.

[0062] In step S310, a lateral gangue blocking is set for the target support based on one support in the middle part of the working face, which greatly improves the safety of construction operation.

[0063] In step S320, the working face conveyor head reaches the target position, so that the roof control area is minimized, and the replacement of the support is gradually realized, avoiding large-area disturbance to the working face roof.

[0064] In step S330, one support is removed each time, reducing the demand for replacement space.

[0065] It can be understood that the tail support is advanced to be uncoupled from the connection with the conveyer, the existing support is used to support the roof, the support space is advanced, and the operation safety is greatly improved. After the support space is advanced, the goaf wood pile support working face is greatly reduced, the operation risk of the initial wood pile support is avoided, the labor operation intensity is reduced, and the operation safety is improved.

[0066] On the basis of the above embodiment, as a preferred embodiment, the lag distance of one support in the middle of the working face is less than the lag distance of the target support.

[0067] It can be understood that the lag distance of one support in the middle of the working face is set to be less than the lag distance of the target support, which can better provide gangue blocking support for the target support, and greatly improve the construction operation safety.

[0068] On the basis of the above embodiment, as a preferred embodiment, the working face conveyer head reaches the target position, comprising:

[0069] The working face conveyer head reaches the position perpendicular to the tangent line of the section coal pillar angle.

[0070] It can be understood that the working face conveyer head reaches the position perpendicular to the tangent line of the section coal pillar angle, the roof control area is minimum, and the support space is maximum.

[0071] On the basis of the above embodiment, as a preferred embodiment, it further comprises:

[0072] In the process of replacing the corresponding target support in the middle of the working face and installing the set tail support, the working face roof is reinforced and supported based on the first protective net, the anchor rod and the anchor cable.

[0073] Optionally, the first protective net is a polyester fiber net. The polyester fiber net, the anchor rod and the anchor cable are used for roof reinforcement and support, and cooperate with the uncoupled support to realize the gangue control in the goaf and avoid the gangue from flowing into the front of the support.

[0074] It can be understood that in the process of advancing the working face, the working face roof is reinforced and supported in advance, the polyester fiber net and the roof reinforcement anchor rod and anchor cable are used for support, and at the same time, the connection between the support and the conveyer is gradually removed in the advancing process, the gangue blocking support of the goaf is completed, and a safe and reliable support space for replacing the support in front of the support is formed.

[0075] On the basis of the above embodiment, as a preferred embodiment, it further comprises:

[0076] If the distance between the working face roof beam and the angle midpoint of the connecting lane reaches a set value, the working face roof is reinforced and supported based on the first protective net, the anchor rod and the anchor cable.

[0077] Optionally, when the distance between the working face roof beam and the middle point of the intersection of the exchange roadway is more than 3 times the mining height, the working face roof is reinforced and supported based on the first protective net, anchor rod and anchor cable.

[0078] It can be understood that the distance between the working face roof beam and the middle point of the intersection of the exchange roadway is set in the embodiment of the application, which helps to form a safe and reliable support exchange space in front of the support.

[0079] On the basis of the above-mentioned embodiment, as a preferred embodiment, the support corresponding to the working face end is replaced after the working face advances by a set distance, comprising:

[0080] After the working face advances by a set distance, the support corresponding to the working face end is replaced in the order of first installation and then removal.

[0081] Optionally, in this process, the empty roof area of the support exchange space is only 1-2 times the support area, which greatly improves the operation safety and avoids roof subsidence.

[0082] It can be understood that the embodiment of the application sets the distance between the working face roof beam and the middle point of the intersection of the exchange roadway, which helps to form a safe and reliable support exchange space in front of the support.

[0083] On the basis of the above-mentioned embodiment, as a preferred embodiment, in the process of replacing the support corresponding to the working face end, the working face roof is reinforced and supported based on the second protective net and anchor rod.

[0084] Optionally, the second protective net is a welded metal net.

[0085] It can be understood that the embodiment of the application uses a welded metal net and an anchor rod for support, and uses a welded metal net instead of a polyester fiber net, which saves support material investment, reduces support workload, and improves operation efficiency.

[0086] On the basis of the above-mentioned embodiment, as a preferred embodiment, the working face advances by a set distance, comprising:

[0087] The working face advances by a distance greater than the length of the support base.

[0088] Optionally, the working face advances by a distance greater than the length of the support base is 4.8-5.6 m.

[0089] It can be understood that the embodiment of the application sets the advancing distance of the working face, which can facilitate subsequent support removal.

[0090] The method for replacing the support in the working face advancing process proposed by the application will be described below with reference to a specific embodiment. Figures 4-7 As shown in the figure, Figure 4 is the first stage of the method, Figure 5 is the second stage of the method, Figure 6The third stage of the method, Figure 7 The fourth stage of the method. It should be noted that the essential steps of the present application are steps S110-S120, and the following steps include preferred steps.

[0091] a. During the working face mining process, the replacement roadway 12 is selected as the support installation and removal passage, and the supports to be installed are stored in the auxiliary roadway 4 in sequence. In the figure, 1 is the mining working face, the roadway 2 is the gob-side entry retaining roadway between the mining working face 1 and the section coal pillar 3, and the auxiliary roadway is arranged on the other side of the section coal pillar 3. The gob is behind the mining working face 1 and the working face support 6.

[0092] b. When the working face top beam is more than 3 times the distance from the replacement roadway 12 to the midpoint of the angle, the polyester fiber net 7 is laid in front of the support, the net steel wire rope 13 is passed through, and the roof reinforcement anchor 8 and the roof reinforcement anchor cable 9 are used for fixation.

[0093] c. During the working face advancing process, the push-pull heads of the 7#-1# supports are gradually removed, the connection with the conveyer is released, and the working face is gradually lagged behind. The distance between the 7# support and the 8# support should be controlled to avoid the inter-support channeling of gangue.

[0094] d. The 7# support is used as a shield to provide lateral gangue blocking for the disassembly and safety of the 6# support.

[0095] e. The 6#-1# supports with removed push-pull heads advance with the working face and gradually enter the gob, cooperate with the roof flexible net, block the gangue in the direction of the gob, and realize the front positioning of the replacement space.

[0096] f. When the outer edge of the working face conveyer head 11 is perpendicular to the tangent of the angle of the section coal pillar 3, the control top area is the smallest and the support entry space is the largest, the 6# support is disassembled, the 6# support is installed, the 5# support is disassembled, the D2 support is installed, the 4# support is disassembled, and the D1 support is installed. Disassemble first and then install, disassemble only one support at a time, and try to minimize the control top area.

[0097] g. The working face continues to advance for a distance, which is slightly larger than the length of the support base, generally 4.8-5.6m.

[0098] h. Welded metal net 10 is used instead of polyester fiber net 7 for surface protection and support, and roof reinforcement anchor 8 is used for fixation.

[0099] i. Install the modified 5# support, the modified 4# support, and the modified 3# support, and then disassemble the 1# support, and arrange the 2# support to the side to provide space for the disassembly of the 3# support.

[0100] j. Move the 2# support forward and connect it with the conveyer to complete all replacement operations.

[0101] The method reduces the roof control area from 10 times the support area to 3-4 times the support area, reduces the roof control area by more than 60%, greatly improves the operation safety, shortens the support replacement period from 7 days to 2 days, reduces the support replacement period by more than 70%, greatly improves the operation efficiency, and is beneficial to high yield and high efficiency of the working face.

[0102] The above only describes the principles and preferred cases of the present application, and the present application is applicable to the replacement of the special support along the gob-side entry retaining, the face expansion and face reduction during the working face advancing, and the replacement of the damaged support during the working face mining.

[0103] In summary, the present application discloses a special support installation method for gob-side entry retaining during working face advancing. In the implementation process of the gob-side entry retaining, in order to avoid the safety hazards caused by the initial weighting of the working face to the gob-side entry retaining operation, the starting point of the entry retaining is often selected after the initial weighting of the working face, which results in the need to install the transition support, the gangue blocking support and other entry retaining special supports during the working face advancing. The traditional installation method is rear installation, which has the disadvantages of large roof control area, difficult roof support, complex process, long installation period, poor safety and the like. The present application proposes a front installation scheme, when the working face approaches the installation entry, the push-pull head between the support to be replaced and the scraper conveyor is removed, the support is gradually lagged behind the working face to support the roof, and the support replacement space is formed, which is gradually installed with the working face advancing, to realize the rapid installation of the special support.

[0104] The present application realizes the rapid installation of the middle support replacement of the working face, is particularly suitable for the support replacement demand of the gob-side entry retaining non-pillar mining technology during the working face advancing, is also suitable for the face expansion and face reduction during the working face advancing, greatly reduces the support replacement roof control space, simplifies the roof support demand of the roof control area, improves the support replacement efficiency, reduces the support replacement period, and improves the working safety.

[0105] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of replacing supports during advancing of a working face, characterized in that, The method comprises: Removing the push-pull heads of the supports corresponding to the end and middle of the working face to form a support replacement space; Replacing the supports in the support replacement space, wherein the crossheading is used as a passageway for support installation and removal during the replacement of the supports; The replacing of the supports in the support replacement space comprises: Replacing the target supports corresponding to the middle of the working face and installing the set tail supports; After the working face advances by a set distance, replacing the supports corresponding to the end of the working face; The replacing of the target supports corresponding to the middle of the working face and the installing of the set tail supports comprises: Setting a lateral gangue blocking for the target supports based on one support in the middle of the working face; If the head of the working face conveyor reaches the target position, replacing the target supports corresponding to the middle of the working face; Removing the supports corresponding to the tail supports in sequence and installing the tail supports; The replacing of the supports corresponding to the end of the working face after the working face advances by a set distance comprises: Replacing the supports corresponding to the end of the working face in the order of installation first and removal later after the working face advances by a set distance.

2. The method of changing supports during face advancement according to claim 1, characterized in that, The lag distance of one support in the middle of the working face is less than the lag distance of the target supports.

3. The method of changing supports during face advancement according to claim 1, characterized in that, The head of the working face conveyor reaching the target position comprises: The head of the working face conveyor reaching a position perpendicular to the tangent of the angle between the working face and the section coal pillar.

4. The method of changing supports during face advancement according to claim 1, characterized in that, The method further comprises: During the replacement of the target supports corresponding to the middle of the working face and the installation of the set tail supports, reinforcing the roof of the working face based on the first protective net, anchor rods and anchor cables.

5. The method of changing supports during advancement of a working face according to claim 4, characterized in that, The method further comprises: If the distance between the roof beam of the working face and the midpoint of the angle between the working face and the crossheading reaches a set value, reinforcing the roof of the working face based on the first protective net, anchor rods and anchor cables.

6. The method of changing supports during face advancement according to claim 1, wherein, During the replacement of the supports corresponding to the end of the working face, reinforcing the roof of the working face based on the second protective net and anchor rods.

7. The method of changing supports during face advancement according to claim 1, wherein, The working face advancing by a set distance comprises: The working face advancing by a distance greater than the length of the support base.

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