阅读说明：本技术 一种溜煤眼的建造方法 (Method for building coal chute ) 是由 史文豹 李传明 常聚才 殷志强 李彦 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种溜煤眼的建造方法,包括如下步骤：步骤1：根据设计要求在运输顺槽底板进行钻眼形成溜煤眼；步骤2：套筒的安装；步骤3：填充混凝土；步骤4：对溜煤眼周围的运输槽底板进行打孔,并进行注浆加固,利用浆液将围岩裂隙以及孔洞进行封堵,致使围岩、混凝土与套筒形成一体。本发明的优点在于,利用注浆将混凝土无法填充的围岩裂隙以及孔洞进行封堵,致使围岩、混凝土与套筒形成一体,提高了溜煤眼周围围岩的支护质量,从而使得溜煤眼不易片帮脱落,确保在工作面回采过程中能够承受煤矸石长期连续不断的冲击,不仅防止了大巷内皮带机系统划伤的现象发生,还也提高了后期溜煤眼出货的安全系数。(The invention discloses a method for building a coal chute, which comprises the following steps: step 1: drilling holes on the bottom plate of the transportation gate according to design requirements to form a coal chute; step 2: mounting the sleeve; and step 3: filling concrete; and 4, step 4: and (3) punching the bottom plate of the transportation groove around the coal chute, grouting and reinforcing, and plugging surrounding rock cracks and holes by using grout so as to integrate the surrounding rock, concrete and the sleeve. The method has the advantages that the surrounding rock cracks and holes which cannot be filled with concrete are plugged by grouting, so that the surrounding rock, the concrete and the sleeve are integrated, the supporting quality of the surrounding rock around the chute hole is improved, the chute hole is not easy to strip and fall off, the coal gangue can be guaranteed to bear long-term continuous impact in the stoping process of a working face, the phenomenon that a belt conveyor system in a large roadway is scratched is prevented, and the safety coefficient of later-stage chute shipment is also improved.)

1. A method for building a coal chute is characterized in that: the method comprises the following steps:

step 1: drilling holes in the bottom plate of the transportation gate according to design requirements until the transportation gate is communicated with a large roadway, and stopping drilling to form a coal chute;

step 2: the sleeves are sequentially hung into the coal chute from bottom to top, a certain gap is kept between the sleeves and the wall of the coal chute to form an annular gap, the adjacent sleeves are mutually matched, installed and connected until the upper opening is flush with the bottom plate of the transportation chute, and the installation of the sleeves is finished;

and step 3: filling concrete into the annular gap in the step 2;

and 4, step 4: and (3) after the concrete in the step (3) is solidified, punching the bottom plate of the transportation groove around the coal chute, grouting and reinforcing, and plugging surrounding rock cracks and holes by using grout so as to integrate the surrounding rock, the concrete and the sleeve.

2. The method for constructing a coal chute as claimed in claim 1, wherein: and in the step 1, drilling holes by using a raise boring machine.

3. The method for constructing a coal chute as claimed in claim 1, wherein: and 2, hoisting the sleeve by using a prop pulling winch.

4. The method for constructing a coal chute as claimed in claim 1, wherein: and in the step 2, the thickness of the sleeves is 15mm, and the sleeves are connected by adopting girth welding.

5. The method for constructing a coal chute as claimed in claim 4, wherein: and welding first reinforcing ribs with the thickness of 20mm at the disc openings of the sleeves, and welding second reinforcing ribs with the width of 50mm and the thickness of 20mm at intervals of 300mm from top to bottom on the sleeves in a surrounding manner.

6. The method for constructing a coal chute as claimed in claim 1, wherein: and (3) adding an early strength agent or a coagulant into the concrete in the step (3).

7. The method for constructing a coal chute as claimed in claim 1, wherein: the punching and grouting in the step 4 comprises the following steps:

step 4.1: punching a bottom plate of the transportation crossheading 0.8m away from the coal wall of the coal chute to form No. 1, No. 2, No. 3 and No. 4 deep holes which are distributed in a cross shape by taking the center of the coal chute;

step 4.2: grouting No. 1, 2, 3 and 4 deep holes until slurry overflows, and stopping grouting;

step 4.3: punching a bottom plate of the transportation crossheading 0.4m away from the coal wall of the coal chute to form No. 5, No. 6, No. 7 and No. 8 shallow holes which are distributed in a cross shape by taking the center of the coal chute;

step 4.4: and grouting the No. 5, 6, 7 and 8 shallow holes until the grout overflows, and stopping grouting.

8. The method for constructing a coal chute as claimed in claim 7, wherein: and the deep holes and the shallow holes are subjected to staggered interval grouting.

9. The method for constructing a coal chute as claimed in claim 7, wherein: the deep hole depth is 5 m.

10. The method for constructing a coal chute as claimed in claim 7, wherein: the depth of the shallow hole is 3 m.

Technical Field

The invention relates to the technical field of coal chute building, in particular to a building method of a coal chute.

Background

Along with the deepening of coal mining, a mine transportation system is more and more complex, in the mining process, the height difference of two transportation roadways often appears, and at the moment, the coal transportation work is generally finished by arranging a coal bunker and a coal sliding hole. The coal bunker building method has the advantages of large investment, long construction period, complex construction technology, less investment for building the coal chute, short required construction period, simple technology and capability of well solving the problem of coal transportation, so the technical design and application research of the coal chute has important significance for efficient and safe transportation of coal, for example, the publication number of CN1740520A discloses an anti-blocking coal chute for underground coal mines, and the coal chute is used for efficiently and safely transporting coal.

Obviously, the coal chute plays an important role in each coal outlet point in the underground coal mine, can be shaped by the 'throat coming', each mine is different according to different mining modes and geological conditions, the geological conditions of the coal mine are extremely complex, and the roadway is greatly influenced by surrounding rock stress and dynamic pressure and seriously damaged, so that the use and safety of the coal chute in the roadway are influenced; as shown in figure 1, many coal chutes of mines are damaged to an unable degree in the use process, the upper and lower large reverse funnels are formed by upper and lower ribs, and some damages fall off completely to the sleeve wall, so that the belt conveyor system in the main roadway at the bottom of the coal chute is scratched, and a great potential safety hazard is caused to later-stage delivery.

Disclosure of Invention

The invention aims to solve the technical problems of preventing the belt conveyor system from being scratched due to the falling of the chute opening upper and improving the safety coefficient of chute opening delivery.

In order to solve the technical problems, the invention provides the following technical scheme:

a method for building a coal chute comprises the following steps:

step 1: and drilling holes on the bottom plate of the transportation gate according to design requirements until the transportation gate is communicated with a large roadway, and stopping drilling to form a coal chute.

Step 2: and (3) hoisting the sleeves into the coal chute eye from bottom to top in sequence, keeping a certain gap with the wall of the coal chute eye to form an annular gap, mutually matching and installing and connecting adjacent sleeves until the upper opening is flush with the bottom plate of the transportation chute, and finishing the installation of the sleeves.

And step 3: and filling concrete into the annular gap in the step 2.

And 4, step 4: and (3) after the concrete in the step (3) is solidified, punching the bottom plate of the transportation groove around the coal chute, grouting and reinforcing, and plugging surrounding rock cracks and holes by using grout so as to integrate the surrounding rock, the concrete and the sleeve.

The surrounding rock cracks and holes which cannot be filled with concrete are plugged by grouting, so that the surrounding rock, the concrete and the sleeve form a whole, the supporting quality of the surrounding rock around the chute hole is improved, the chute hole is not easy to strip and drop, long-term continuous impact of coal gangue can be borne in the stoping process of a working face, the phenomenon that the belt conveyor system in a large roadway is scratched is prevented, and the safety coefficient of later-stage chute shipment is also improved.

Preferably, a raise boring machine is used for drilling in the step 1.

Preferably, a prop pulling winch is used for hoisting the casing in the step 2.

Preferably, the thickness of the sleeve in the step 2 is 15mm, and the sleeve is connected by using girth welding.

Preferably, a first reinforcing rib with the thickness of 20mm is additionally welded at the disc opening of the sleeve, and a second reinforcing rib with the width of 50mm and the thickness of 20mm is welded at the distance of 300mm from top to bottom of the sleeve in a surrounding mode, so that the strength of the sleeve is improved, and the sleeve is prevented from being deformed and falling off under stress.

Preferably, an early strength agent or an accelerator is added into the concrete in the step 3, so that the setting time of the concrete is shortened, and the construction efficiency of the coal chute is improved.

Preferably, the drilling and grouting in the step 4 comprises the following steps:

step 4.1: and (3) punching a bottom plate of the transportation crossheading which is 0.8m away from the coal wall of the coal chute to form No. 1, No. 2, No. 3 and No. 4 deep holes which are distributed in a cross shape by taking the center of the coal chute.

Step 4.2: and (4) grouting the deep holes 1, 2, 3 and 4 until the slurry overflows, and stopping grouting.

Step 4.3: the bottom plate of the transportation crossheading with the distance of 0.4m from the coal wall of the coal chute is perforated to form No. 5, No. 6, No. 7 and No. 8 shallow holes which are distributed in a cross shape by the center of the coal chute.

Step 4.4: and grouting the No. 5, 6, 7 and 8 shallow holes until the grout overflows, and stopping grouting.

Through the combined grouting of the deep hole and the shallow hole, the surrounding rock gaps around the coal chute and between the transportation gate bottom plate and the large roadway top plate can be subjected to grouting reinforcement, and the supporting quality of the surrounding rock around the coal chute is further improved.

Preferably, the deep holes and the shallow holes are grouted at staggered intervals.

Preferably, the deep hole depth is 5 m.

Preferably, the shallow hole depth is 3 m.

Compared with the prior art, the invention has the beneficial effects that:

1. the surrounding rock cracks and holes which cannot be filled with concrete are plugged by grouting, so that the surrounding rock, the concrete and the sleeve form a whole, the supporting quality of the surrounding rock around the chute hole is improved, the chute hole is not easy to strip and drop, long-term continuous impact of coal gangue can be borne in the stoping process of a working face, the phenomenon that the belt conveyor system in a large roadway is scratched is prevented, and the safety coefficient of later-stage chute shipment is also improved.

2. Through the slip casting that punches downwards from the transportation crossheading bottom plate, convenient operation can also utilize thick liquid self gravity to flow in country rock crack and hole, improves the slip casting effect and improves the quality of strutting of country rock around the chute hole.

3. Through the combined grouting of the deep hole and the shallow hole, the surrounding rock gaps around the coal chute and between the transportation gate bottom plate and the large roadway top plate can be subjected to grouting reinforcement, and the supporting quality of the surrounding rock around the coal chute is further improved.

4. By adding the early strength agent or the coagulant into the concrete, the setting time of the concrete is shortened, and the construction efficiency of the coal chute is improved.

Drawings

FIG. 1 is a schematic view of a prior art coal chute;

FIG. 2 is a schematic structural view of a coal chute according to an embodiment of the present invention;

FIG. 3 is a top view of a coal chute according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sleeve according to an embodiment of the present invention.

Detailed Description

In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 2 and 3, the embodiment discloses a method for constructing a coal chute, comprising the following steps:

step 1: and drilling holes on the bottom plate of the transportation gate 1 by using a raise boring machine according to design requirements until the transportation gate is communicated with the main roadway 2, and stopping drilling to form a coal chute 3.

Step 2: the sleeves 4 are sequentially hung into the coal chute 3 from bottom to top through the prop pulling winch, a certain gap is kept between the sleeves and the wall of the coal chute 3 to form an annular gap, the adjacent sleeves 4 are installed and connected in a surrounding welding mode until the upper opening is flush with the bottom plate of the transportation crossheading 1, the installation of the sleeves 4 is finished, and the quality of surrounding rock supporting is improved by the sleeves 4.

And step 3: and (3) filling concrete 5 into the annular gap in the step (2), and adding an early strength agent or a coagulant into the concrete 5, so that the setting time of the concrete 5 is shortened, and the construction efficiency of the coal chute 3 is improved.

And 4, step 4: after the concrete 5 in the step 3 is solidified, the bottom plates of the transportation grooves 1 around the coal chute 3 are punched and are subjected to grouting reinforcement, surrounding rock cracks and holes which cannot be filled with the concrete 3 are plugged by using slurry, so that the surrounding rock, the concrete and the sleeve form a whole, the supporting quality of the surrounding rock around the coal chute 3 is improved, the coal chute 3 is not easy to strip and drop, the long-term continuous impact of coal gangue can be borne in the stoping process of a working face, the scratch phenomenon of the belt conveyor system in the large roadway 2 is prevented, and the safety coefficient of the later-period coal chute 3 is also improved.

The concrete punching and grouting comprises the following steps:

step 4.1: and (3) punching a bottom plate of the transportation crossheading 1 which is 0.8m away from the coal wall of the coal chute to form deep holes 6 of No. 1, No. 2, No. 3 and No. 4, wherein the deep holes 6 are distributed in a cross shape by taking the center of the coal chute 3, and the depth of each deep hole 6 is 5 m.

Step 4.2: and (4) carrying out staggered interval grouting on the deep holes 6 of No. 1, No. 2, No. 3 and No. 4 until the grout overflows, and stopping grouting.

Step 4.3: and punching a bottom plate of the transportation crossheading 1 which is 0.4m away from the coal wall of the coal chute to form 5, 6, 7 and 8 shallow holes 7 which are distributed in a cross shape by taking the center of the coal chute 3, wherein the depth of the shallow holes 7 is 3 m.

Step 4.4: and (5) alternately grouting the shallow holes 7 of No. 5, 6, 7 and 8 until the grout overflows, and stopping grouting.

It should be noted that, because the operation of upward punching and grouting from the top plate of the main roadway 2 is not easy and the grouting effect cannot be guaranteed, in this embodiment, downward punching and grouting from the bottom plate of the transportation crossheading 1 are adopted, the operation is convenient, the grout can flow into the surrounding rock cracks and holes by utilizing the gravity of the grout, the grouting effect is improved, the supporting quality of the surrounding rock around the coal chute 3 is further improved, and the grouting is combined through the deep hole 6 and the shallow hole 7, so that the grouting reinforcement can be performed on the surrounding rock gaps around the coal chute 3 and between the bottom plate of the transportation crossheading 1 and the top plate of the main roadway 2, and the supporting quality of the surrounding rock around the coal chute 3 is further improved.

Further, referring to fig. 4, in this embodiment, the sleeve 4 is made of a steel plate with a thickness of 15mm, a first reinforcing rib 41 with a thickness of 20mm is welded at a disc opening of the sleeve 4, and a second reinforcing rib 42 with a width of 50mm and a thickness of 20mm is welded around the sleeve 4 from top to bottom at intervals of 300mm, so as to improve the strength of the sleeve 4 itself and prevent the sleeve 4 from deforming and falling off under stress.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

The above-mentioned embodiments only represent embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.