CN106968687B - Closed ring yielding support device and support method for steeply inclined coal seam mining roadway - Google Patents
Closed ring yielding support device and support method for steeply inclined coal seam mining roadway Download PDFInfo
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- CN106968687B CN106968687B CN201710214814.9A CN201710214814A CN106968687B CN 106968687 B CN106968687 B CN 106968687B CN 201710214814 A CN201710214814 A CN 201710214814A CN 106968687 B CN106968687 B CN 106968687B
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- 239000003245 coal Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005065 mining Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 239000011435 rock Substances 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
一种急倾斜煤层回采巷道封闭式圆环让压支护装置，由至少三个孤形支撑件通过至少两个固定套筒和至少一个限位套筒首尾相接形成的圆环封闭式支护装置。本发明中设置可吸能让压接口，使得支护装置保持一定支护阻力支护围岩稳定的同时，又允许支护装置产生一定的位移进行让压吸能，达到支护、吸能让压多重并举的功能；设置的可伸缩接口能让支护装置适应不同大小的巷道；所述的支护方法是通过封闭式圆环让压支护装置作为支护骨架，槽钢作为两封闭式圆环让压支护装置的连接杆。本发明适用于类似急倾斜煤层回采巷道支护体承受高压非均匀载荷和围岩具有非对称变形等特点的所有巷道，同样适用于急倾斜煤层回采巷道的沿空留巷支护。
The utility model relates to a closed annular pressure-yielding support device for steeply inclined coal seam mining roadway. device. In the present invention, a suction energy-pressure interface is provided, so that the support device maintains a certain support resistance and supports the surrounding rock stability, and at the same time allows the support device to generate a certain displacement for pressure absorption and energy absorption, so as to achieve the support and absorption energy. The function of simultaneous lifting of pressure and multiple; the set retractable interface can make the support device adapt to different sizes of roadways; the support method is to use the closed ring to make the pressure support device as the support frame, and the channel steel as the two closed type The ring allows the connecting rod of the compression support device. The invention is suitable for all roadways with similar characteristics of steeply inclined coal seam mining roadway support body bearing high pressure non-uniform load and surrounding rock with asymmetric deformation, etc. It is also suitable for gob-side entry retaining support of steeply inclined coal seam mining roadway.
Description
Technical Field
The invention relates to a supporting device and a supporting method for a mining roadway of a steep coal seam, in particular to a closed circular ring yielding supporting device and a supporting method for the mining roadway of the steep coal seam.
Background
The steeply inclined coal seam generally refers to a coal seam with an inclination angle larger than 45 degrees, a surrounding rock medium of a stoping roadway of the steeply inclined coal seam generally has height nonuniformity and discontinuity, numerous joint cracks exist, particularly, under the action of advanced supporting pressure, the surrounding rock has the characteristics of asymmetric deformation and uneven loading of a supporting body, the roadway is easy to have the characteristics that the stratums are mutually staggered, the deformation presents highly asymmetric, the roof fall phenomenon is abnormal and prominent, particularly, the upper wall of an upper gateway and the lower wall of a lower gateway in stoping of the steeply inclined coal seam present extremely unstable characteristics under the influence of stress concentration, and the complexity and the difficulty of the stoping roadway supporting operation are greatly increased.
The steep coal seam roadway basically adopts the traditional U-shaped steel yieldable supporting device and method or I-shaped steel bracket supporting device and method, and the steel bracket is generally not closed into a circular ring, does not yield to a high-pressure uneven stress state and has low adaptability. The existing supporting devices and supporting methods have defects, compression yielding effects are not ideal, good energy absorption yielding effects cannot be achieved, erection is difficult, applicability is not strong, and the supporting problem of a steeply inclined coal seam mining roadway, particularly the problem of gob-side entry retaining of steeply inclined coal-pillar-free mining is difficult to solve by the traditional supporting mode and process.
Disclosure of Invention
In order to solve the technical problems of the support device and the support method for the stoping roadway of the steeply inclined coal seam, the invention aims to provide the closed type circular ring yielding support device and the support method for the stoping roadway of the steeply inclined coal seam, which have the advantages of simple structure, safety, reliability, simplicity and convenience in operation and strong applicability.
The technical scheme adopted by the invention for solving the technical problems is as follows: a closed circular ring yielding support device for a mining roadway of a steep coal seam is a circular ring closed support device formed by connecting at least three arc-shaped support pieces end to end through connecting pieces.
Preferably, the connecting piece is a connecting sleeve and comprises at least two fixing sleeves and at least one limiting sleeve.
Preferably, the connecting interface of the connecting piece in the fixed sleeve is a parallel interface, and telescopic adjustment is performed through a fastening nut so as to adapt to roadways with different sizes.
Preferably, the connecting interface of the connecting piece positioned in the limiting sleeve is a corrugated interface, and the connecting interface plays a role in absorbing energy and yielding pressure in the telescopic process.
Preferably, the limiting sleeve is provided with an opening, and a reinforcing fastening nut 4 is arranged at the opening.
Preferably, the connecting interfaces of the fixed sleeve and the connecting piece in the fixed sleeve are provided with a plurality of matched connecting holes.
Preferably, the arc-shaped supporting piece is a steel section.
Preferably, the length of the staggered interface at the corrugated interface is not less than 1/2 of the length of the whole corrugation, and the compression distance of the staggered interface can be controlled to be 10-30 cm.
Preferably, the side part of the annular closed supporting device is provided with a U-shaped groove.
The method for supporting the stoping roadway of the steeply inclined coal seam by using the closed type circular ring yielding supporting device is characterized in that the circular ring closed type supporting device is used as a supporting framework, and channel steel is used as a connecting rod of the supporting framework, and comprises the following steps:
(1) digging a circular section at a position of a roadway where a supporting device is required to be erected;
(2) erecting a plurality of sections of arc-shaped supporting pieces at the circular section, and connecting the sections by using a connecting sleeve and a bolt to form a circular ring closed supporting device;
(3) adjusting a connecting interface in the connecting sleeve according to the size of the round tunnel, and fixing the connecting interface by using a fastening bolt to enable the supporting device to be tightly attached to the rock wall of the tunnel;
(4) backfilling the bottom of the roadway according to the marked waist line of the roadway after erection is finished, and leveling the roadway;
(5) under the condition that a full-section high-strength closed support is needed for a roadway, arc-shaped channel steel is fully erected in U-shaped grooves on the side portions of every two circular-ring closed support devices, and the distance required by yielding of the circular-ring closed support devices is reserved, so that full-section closed high-strength yielding support can be achieved; under the condition of no need of full-section high-strength support, a proper amount of arc-shaped channel steel is laid, and a metal net is additionally arranged for roadway support.
The invention has the beneficial effects that: according to the invention, the arc-shaped support piece steel section bars are combined and sealed into a circular ring, and the energy-absorbing yielding interface (namely J1 corrugated interface) is arranged, so that the support device can effectively realize the stability of the surrounding rock supported by a certain support resistance, and simultaneously allows the support device to generate a certain displacement to carry out yielding energy absorption, thereby achieving the functions of supporting, energy-absorbing yielding and multiple lifting; the telescopic interfaces (namely J2 parallel interfaces) are arranged, so that the supporting device can adapt to roadways with different sizes; in addition, according to actual need, the channel steel can be erect to the both sides U type groove that the I-steel possesses to can form the closed whole of full section to the tunnel and strut.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view B-B of the top J1 corrugated interface and sleeve of the present invention;
FIG. 3 is a cross-sectional view of the bottom J2 parallel port and sleeve A-A of the present invention;
FIG. 4 is a schematic diagram of the construction of a supporting joist steel according to the present invention;
FIG. 5 is a schematic view of the overall construction and supporting method of the channel steel of the present invention;
fig. 6 is a fragmentary view of fig. 5.
In the figure: 1-G2I-steel, 2-limiting sleeve, 3-fixing sleeve, 4-fastening nut, 5-G1I-steel, 6-G3I-steel, 7-nut hole, 8-J1 corrugated interface, 9-J2 parallel interface, 10-backfill gangue and 11-arc channel steel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-6, the device comprises a G1I-beam 5, a G2I-beam 1, a G3I-beam 6, an I-shaped connecting and fixing sleeve 3, an I-shaped connecting and limiting sleeve 2 and a fastening nut 4.
The supporting device is combined and sealed into a circular ring through G1I-steel 5, G2I-steel 1, G3I-steel 6, an I-shaped connecting and fixing sleeve 3, an I-shaped connecting and limiting sleeve 2 and a fastening nut 4. The J1 corrugated connector 8 on the upper parts of the G2I-steel 1 and the G3I-steel 6 is corrugated, and can play a role in absorbing energy and yielding pressure in the process of compression displacement (20-50 cm). The I-shaped connecting limiting sleeve 2 is made of a high-rigidity thickened steel plate and is not prone to deformation, the reinforcing fastening nut 4 is arranged at the bottom of the limiting sleeve, and lateral displacement of the J1 corrugated connector 8 can be well limited while displacement is facilitated. The parallel joint 9 of the J2 at the lower parts of the G1I-steel 5, the G2I-steel 1 and the G3I-steel 6 is a parallel joint, can be telescopically adjusted by the fastening nut 4, and can be suitable for roadways with different sizes. U-shaped grooves are formed in two sides of the I-shaped steel supporting device, an arc-shaped channel steel 11 can be erected between every two supporting devices, the distance L between the two circular ring supporting devices, namely the length of the channel steel 11, is determined according to the pressure condition of the roadway, and therefore the roadway is supported integrally in a full-section closed mode.
The implementation process of the invention is as follows: firstly, excavating a circular section at a position of a roadway where a supporting device needs to be erected, and selecting the size and the model of the supporting device according to the size of the section; next, G1 i-beam 5 was erected at the bottom of the round roadway, aligned to the center line. The I-shaped connecting and fixing sleeves 3 are respectively sleeved at two ends of the G1I-shaped steel and moved to the position where the interface is exposed from the middle of the I-shaped steel; next, erecting a G2I-beam 1, aligning the lower end of the G2I-beam 1 with the J2 parallel interface 9, moving the left I-shaped connecting and fixing sleeve 3 upwards to cover the J2 parallel interface 9 after aligning and splicing, and fixing by using a fastening nut 4; at the moment, the I-shaped connecting limiting sleeve 2 is sleeved on the G2I-shaped steel 1 in advance and is moved leftwards to the position where the corrugated interface is exposed; next, erecting G3H-shaped steel 6, aligning the lower end of the G3H-shaped steel 6 with the J2 parallel interface 9, moving the right H-shaped connecting and fixing sleeve 3 upwards to cover the J2 parallel interface 9 after aligning and splicing, and fixing by using a fastening nut 4; at this point, the top J1 corrugated seam 8 will be partially closed, the closed length being about 1/2 of the overall seam length; next, moving the I-shaped connecting limiting sleeve 2 from the G2I-shaped steel 1 to the top to completely cover the J1 corrugated interface 8, aligning the central lines, fastening and reinforcing by using a fastening nut 4, and finishing erection of the supporting device; at the moment, J2 parallel interfaces 9 on two sides can be adjusted by connecting the fixing sleeve 3, the fastening nut 4 and the nut hole 7 in an I shape, so that the supporting device is close to the rock wall of the roadway as much as possible; secondly, backfilling the waste rock 10 at the bottom after erection is finished, wherein the backfilling is carried out according to a waist line marked by a roadway, after the backfilling, the bottom plate is flat, the front and rear slopes are consistent, the track is padded firmly, and the track is not required to be suspended; at the moment, if full-section closed support is required, arc-shaped channel steel 11 can be erected in U-shaped grooves at two sides of every two I-shaped steels, and full-section closed support can be realized; and finally, when the roadway begins to be damaged and deformed, the circular ring supporting device is compressed and contracted, the corrugated connector 8 at the top J1 begins to be relatively displaced, and the supporting device begins to perform energy absorption yielding support.
Claims (2)
1. A closed circular ring yielding support device for a mining roadway of a steep coal seam is characterized in that a circular ring closed support device is formed by connecting three sections of circular arc I-shaped steel support pieces end to end through connecting pieces; the connecting piece is a connecting sleeve and comprises two adjustable fixed sleeves and a limiting sleeve; the lower connecting interface in the fixed sleeve is of a parallel interface and a porous structure, and is telescopically adjusted by fastening bolts and nuts so as to adapt to roadways of different sizes; the limiting sleeve is arranged at the top, the connecting interface in the limiting sleeve is an occlusion splicing corrugated interface, the length of the staggered interface of the corrugated interface is not less than 1/2 of the overall corrugated length, and the compression distance of the corrugated interface is controlled to be 10-30 cm; under the condition that a full-section high-strength closed support is needed for a roadway, arc-shaped channel steel is erected on the side parts of every two circular ring closed support devices, and the distance required by yielding of the circular ring closed support devices is reserved, so that full-section closed high-strength yielding support can be realized; under the condition of no need of full-section high-strength support, a proper amount of arc-shaped channel steel is laid, and a metal net is additionally arranged for roadway support.
2. The method for supporting the mining roadway of the steeply inclined coal seam by using the closed circular ring yielding supporting device as claimed in claim 1, which is characterized in that the roadway supporting method by using the circular ring closed supporting device as a supporting framework and using channel steel as a connecting rod of the supporting framework comprises the following steps:
(1) digging a circular section at a position of a roadway where a supporting device is required to be erected;
(2) erecting a plurality of sections of arc-shaped supporting pieces at the circular section, and connecting the sections by using a connecting sleeve and a bolt to form a circular ring closed supporting device;
(3) adjusting a connecting interface in the connecting sleeve according to the size of the round tunnel, and fixing the connecting interface by using a fastening bolt to enable the supporting device to be tightly attached to the rock wall of the tunnel;
(4) backfilling the bottom of the roadway according to the marked waist line of the roadway after erection is finished, and leveling the roadway;
(5) under the condition that a full-section high-strength closed support is needed for a roadway, arc-shaped channel steel is fully erected in U-shaped grooves on the side portions of every two circular-ring closed support devices, and the distance required by yielding of the circular-ring closed support devices is reserved, so that full-section closed high-strength yielding support can be achieved; under the condition of no need of full-section high-strength support, a proper amount of arc-shaped channel steel is laid, and a metal net is additionally arranged for roadway support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710214814.9A CN106968687B (en) | 2017-04-01 | 2017-04-01 | Closed ring yielding support device and support method for steeply inclined coal seam mining roadway |
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| CN201710214814.9A CN106968687B (en) | 2017-04-01 | 2017-04-01 | Closed ring yielding support device and support method for steeply inclined coal seam mining roadway |
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| CN106968687A CN106968687A (en) | 2017-07-21 |
| CN106968687B true CN106968687B (en) | 2020-04-14 |
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| CN108019228A (en) * | 2018-01-17 | 2018-05-11 | 安徽理工大学 | A kind of flexibility allow pressure improvement floor lift in gallery combined retaining structure and its construction method |
| CN109057831B (en) * | 2018-10-30 | 2023-05-12 | 湖南科技大学 | Partition type supporting device and supporting method for underground large-section roadway |
| CN112065461B (en) * | 2020-10-22 | 2021-09-28 | 中国矿业大学(北京) | Deep round tunnel anti-impact supporting method |
| CN117307191B (en) * | 2023-11-28 | 2024-03-22 | 中煤科工开采研究院有限公司 | Rock burst roadway anchor-frame-charging coupling support system, method and monitoring system |
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