A method for reconstructing high-strength roadside pressure relief rapid filling roadway support

Abstract

The application discloses a kind of reformed high-strength roadside pressure-relief rapid filling formation roadway supporting methods, belong to roadway supporting technical field, comprising the following steps: roadway surrounding rock extension, roof temporary support, roadside formwork and wall filling, by the above four steps, it is realized in the roadway surrounding rock place and adds high-strength wall, the high-strength wall that adds replaces the surrounding rock of original roadway two sides loose, broken, strength first, changes the characteristics of roadway surrounding rock fundamentally, increases the ability of roadway surrounding rock to resist deformation, reduces roadway maintenance frequency, fundamentally reduces roadway maintenance cost, improves mine roadway safety condition, greatly improves mine economic benefit, the application is suitable for popularization and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roadway support, in particular to a method for reconstructing high-strength roadside pressure relief rapid filling into roadway support. BACKGROUND

[0002] Coal mines in China are mainly underground mining, which requires excavating a large number of roadways underground. With the deepening of mining depth and the influence of mining pressure, the roadway support in coal mines becomes more and more difficult. At present, the roadway in coal mines mainly adopts the technologies and processes of shed, anchor net cable spray, surrounding rock grouting reinforcement and support. When adopting the support methods of anchor net cable spray and shed, due to the soft rock of roadway surrounding rock, which is broken, loose and low in strength, under the frequent influence of high ground stress and mining pressure, the roadway cross section shrinkage rate reaches 60%, the displacement of two sides is large, which seriously affects ventilation and pedestrians, and affects the mining replacement of the mine; when adopting the shed support, due to the soft rock, loose, broken and low strength of the roadway surrounding rock, under the influence of ground stress and repeated mining stress, the roadway U-shaped steel shed is severely deformed, and the roadway cross section shrinkage rate is as high as 50% or more. The existing roadway surrounding rock support method passively takes the surrounding rock reinforcement measures to resist the shrinkage and deformation of the roadway surrounding rock, and the roadway is frequently repaired, which seriously affects the mining replacement and economic benefits of the mine.

[0003] Therefore, it is urgent to strengthen the support of the roadway surrounding rock. SUMMARY

[0004] The present application aims at solving the technical problem of low support capacity of the existing roadway surrounding rock, and provides a method for reconstructing high-strength roadside pressure relief rapid filling into roadway support.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A method for reconstructing high-strength roadside pressure relief rapid filling into roadway support, comprising the following steps:

[0007] 1) roadway surrounding rock expansion: the roadway surrounding rock is divided into a plurality of module walls for expansion, and the expansion width and length of each module wall are 2-3m and 2-5m respectively;

[0008] 2) temporary support of roof: after the expansion of the roadway surrounding rock, anchor rods are used for reinforcement as temporary support in the expansion area of the roadway surrounding rock;

[0009] 3) roadside formwork: along the direction of the roadway, steel mesh is laid at a distance of 0.5-1m from the two sides of the roadway, the height of the steel mesh reaches the roof, the steel mesh is penetrated by the anchor rod and the steel ladder is installed, and finally the filling bag is hung on the steel mesh;

[0010] 4) wall filling: insert the compressed air pipe into the filling bag, open the compressed air, and then insert the slurry mixing pipe into the filling bag to inject slurry, when the liquid level of the slurry is 0.3m away from the roof, slowly inject the slurry until the slurry contacts the roof, then stop injecting the slurry, and complete the wall filling.

[0011] The working principle of the present application is: after the roadway surrounding rock is expanded, the roof is temporarily supported, then the steel mesh is laid at a certain distance from the side, the formwork is operated, and then the slurry is filled on the steel mesh to form a wall. Since the wall has a rigid steel mesh structure inside, the strength of the wall is improved. By adding a high-strength wall to the roadway surrounding rock, the added high-strength wall replaces the original loose, broken, and low-strength surrounding rock on both sides of the roadway, fundamentally changes the characteristics of the roadway surrounding rock, increases the ability of the roadway surrounding rock to resist deformation, reduces the frequency of roadway maintenance, fundamentally reduces the cost of roadway maintenance, improves the safety conditions of mine shafts and roadways, greatly improves the economic benefits of mines, and is suitable for popularization and application.

[0012] Further, the construction of both sides is carried out separately, and the construction of one side is stopped when the construction length reaches 20-30m, and then the construction of the other side is carried out after the filled wall reaches the preset strength.

[0013] Further, according to the stability of the roof of the roadway surrounding rock, the construction of the side with lower stability is carried out first.

[0014] Further, the fixing of the roadway surrounding rock expansion area can also use anchor cables or sheds for temporary support.

[0015] Further, in step 3), the position of 0.5-1m is a pressure relief buffer zone.

[0016] Further, in step 3), the temporary single column for setting temporary reinforcement support roof around the steel mesh.

[0017] Further, the steel mesh is made of steel bars, the overlapping parts of the steel bars are firmly tied with iron wire, and the diameter of the steel bars is 6mm.

[0018] Further, the sleeves of the pair of tension anchor rods are tightly tied with a tie.

[0019] Further, in step 4), the grouting includes the following steps:

[0020] a. The slurry is prepared from water and ash in a mass ratio of 1.5:1;

[0021] b.The slurry is pressurized by using a double-liquid grouting pump, and then is delivered to the slurry mixing pipe at the filling point through two high-pressure pipes connected to the double-liquid grouting pump; after the slurry is delivered out of the slurry mixing pipe, the stop valve on the slurry mixing pipe is closed, and the end of the slurry mixing pipe out of which the slurry is delivered is inserted into the filling bag, and the end of the slurry mixing pipe out of which the slurry is delivered is tightly tied, and the grouting preparation work is completed.

[0022] Further, the preparation method of the slurry comprises the following steps: mixing and stirring water and ash in a stirring barrel for 3-5 min to prepare the slurry.

[0023] Further, the high-pressure pipe is a rubber pipe capable of bearing pressure higher than 16 MPa.

[0024] The present application has the following beneficial effects:

[0025] The present application expands the surrounding rock of the roadway supported by the anchor net cable or the shed, and then uses the anchor rod, anchor cable or shed as temporary support in the expanded area, and then reserves a certain width of pressure relief buffer zone in the two sides of the roadway under the shelter of the temporary support, and then fills the high-strength wall body to support the roof in the two sides of the roadway. The high-strength wall body "replaces" the plastic surrounding rock with loose, broken and low strength in the two sides of the roadway, essentially changes the characteristics of the surrounding rock of the roadway, improves the strength of the surrounding rock of the roadway, and increases the ability of the surrounding rock of the roadway to resist deformation. At the same time, by reserving a certain range of pressure relief buffer zone in the two sides of the roadway, the time of convergence and deformation of the roadway is further improved, the service life of the roadway is improved, the maintenance frequency of the roadway is reduced, the maintenance cost of the roadway is fundamentally reduced, the safety condition of the mine roadway is improved, and the economic benefit of the mine is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the rapid roadway forming process flowchart of the bearing arch of the present application;

[0027] Figure 2 is the surrounding rock expansion plane diagram of the roadway;

[0028] Figure 3 is the sectional view of the roadway;

[0029] Figure 4 is the support diagram of the roadway section after the expansion of the two sides;

[0030] Figure 5 is the plane diagram of the wall body filled in the two sides of the roadway;

[0031] Figure 6 is the sectional view of the wall body filled in the two sides of the roadway;

[0032] Figure 7 is the perspective view of the filled wall body;

[0033] Figure 8is a schematic diagram of a reconstructed high-strength roadside pressure relief rapid filling into a roadway;

[0034] Reference signs: 1-wall; 2-anchor rod; 3-pressure relief buffer zone; 4-shoulder expansion area; 5-steel mesh; 6-pull anchor rod; 7-temporary monomer column; 8-steel ladder; 9-anchor cable. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments.

[0036] Example 1

[0037] As shown in Figures 1-8 A reconstructed high-strength roadside pressure relief rapid filling into a roadway supporting method, comprising the following steps:

[0038] 1) Expanding the roadway surrounding rock: the roadway surrounding rock is divided into a plurality of module walls 1 for expanding, and the expanding shoulder width and length of each module wall 1 are 2-3m and 2-5m respectively;

[0039] 2) Temporary support of roof: after expanding the roadway surrounding rock, anchor rods 2 are used to reinforce the expanded shoulder area 4 of the roadway surrounding rock as temporary support;

[0040] 3) Roadside formwork: along the direction of the roadway, steel mesh 5 is laid at a distance of 0.5-1m from the two sides of the roadway, the height of the steel mesh 5 reaches the roof, pull anchor rods 6 are inserted into the steel mesh 5 and steel ladders 8 are installed, temporary monomer columns 7 are set around the steel mesh 5 to fix the position of the steel mesh 5, then filling bags are hung on the steel mesh 5, and finally it is checked whether the pull anchor rod 6 sleeve is tight and whether the size and installation position of the steel mesh 5 meet the design requirements;

[0041] 4) Wall filling: insert the pressure pipe into the filling bag exhaust sleeve and open the pressure, then insert the slurry outlet of the slurry mixing pipe into the filling bag for grouting, when the liquid level of the slurry is 0.3m from the roof, slowly grout until the slurry contacts the roof to stop grouting, complete the wall 1 filling, the width of the wall 1 filling is 1-2m, the length is 2-5m, and the length of the wall 1 filling does not exceed the length of one module of the shoulder expansion.

[0042] When the embodiment is implemented, the roadway surrounding rock is divided into multiple modules to be constructed in sequence. The construction of a module is to expand the brush on the basis of the original roadway surrounding rock. When the width of the brush is 2-3m and the length of the brush is 2-5m, the brush is temporarily stopped, the anchor rod 2 is arranged on the roof of the expanded brush area 4 of the expanded brush of the roadway surrounding rock to reinforce and hang the net as a temporary support, and then the concrete is sprayed. The roadway floor is cleaned of floating gangue, the steel mesh 5 is laid at a distance of 0.5-1m from the side, the steel mesh 5 is fully closed from the bottom to the top of the roadway surrounding rock, then the pulling anchor rod 6 and the steel ladder 8 are passed through the inside of the steel mesh 5, the two side ends of the pulling anchor rod 6 are connected with the steel ladder 8, the pulling anchor rod 6 and the steel ladder 8 form a vertical structure, the filling bag is hung on the steel mesh 5, the pressure pipe is inserted into the filling bag, the pressure is opened, the slurry mixing pipe is inserted into the filling bag, the double-liquid grouting pump is opened to grout, when the liquid level of the slurry is 0.3m from the roof, the grouting speed is reduced, the grouting is slowly injected, until the liquid level of the slurry contacts the roof, the grouting is stopped, the slurry mixing pipe is pulled out from the filling bag, the steel mesh 5 and the concrete form the wall body 1 after grouting, the filling of the wall body 1 is completed, and the construction of the next module is performed after the construction of the module is completed. The construction method of each module is the same.

[0043] In the embodiment, the construction operation of the roadway surrounding rock support is divided into multiple modules to be constructed in sequence, so that after the expansion of each module is completed, the expanded brush area 4 can be temporarily supported in time, the risk of falling stones on the roof injuring the construction personnel is reduced, the safety of the construction personnel is ensured, and the construction is facilitated for the grouting operation of the steel mesh 5, the fusion between the slurries is ensured, and the quality of the wall body 1 is improved. Since the steel mesh 5 is arranged inside the wall body 1, the strength of the wall body 1 is improved. The slurry is directly filled in the steel mesh 5 after the steel mesh 5 is laid, the operation is simple, and the wall body 1 is quickly formed. By adding the high-strength wall body 1 at the roadway surrounding rock, the high-strength wall body 1 replaces the original loose, broken and low-strength surrounding rock on both sides of the roadway, the characteristics of the roadway surrounding rock are fundamentally changed, the deformation resistance of the roadway surrounding rock is increased, the maintenance frequency of the roadway is reduced, the maintenance cost of the roadway is fundamentally reduced, the safety conditions of the mine roadway are improved, the economic benefits of the mine are greatly improved, and the application of the invention is suitable for popularization and application.

[0044] Further, in step 3), the multiple temporary single columns 7 of the temporary reinforced support roof are arranged around the steel mesh 5, and whether the temporary single column 7 is strong is checked before the wall body 1 is filled. Since the support strength of the wall body 1 formed by the grouting of the steel mesh 5 is weak, the multiple temporary single columns 7 are arranged to cooperate with the just-filled wall body 1 to enhance the support strength of the wall body 1. When the embodiment is completed, the strength of the wall body 1 reaches the design requirement, the temporary single column 7 is withdrawn, and the steel mesh 5 made of the slurry is used as a permanent support without being withdrawn.

[0045] Further, the roadway surrounding rock expansion area 4 can also be temporarily supported by anchor cable 9 or shed.

[0046] Further, the steel mesh 5 is made of steel reinforcement, and the overlapping part of the steel reinforcement is firmly bound by wire. The diameter of the steel reinforcement is 6 mm, and the grid specification of the steel mesh is 100 mm x 100 mm, which increases the strength of the wall 1.

[0047] Further, the steel mesh 5 near each side is made of steel reinforcement overlapping the four sides of the rectangular structure formed in the expanded brushing area. The steel reinforcement of the four sides forms the steel mesh 5, and the width of the rectangle is 1-2 m, and the length of the rectangle is adapted to the length of the expanded brushing.

[0048] Further, the sleeve of the pair of tension anchor rods 6 is tightened with a tie.

[0049] Example 2

[0050] As shown in Figures 5-8 , based on example 1, the construction of the two sides of the roadway surrounding rock is carried out separately. When the construction length of one side is 20-30 m, the construction is stopped. After the filling wall 1 reaches the preset strength, the construction of the other side is carried out.

[0051] In this embodiment, after one side construction is completed and the filling wall 1 reaches the preset strength, the construction of the other side is carried out, which facilitates the construction of the same side.

[0052] Further, according to the stability of the roof of the roadway surrounding rock, the construction of the side with lower stability is carried out first. Avoiding the situation that when one side of the roadway surrounding rock is under construction, the roof of the other side with lower stability collapses or falls, which has great hidden dangers to the safety of construction personnel.

[0053] Example 3

[0054] As shown in Figure 5 , Figure 6 , and Figure 8 , based on example 1, in step 3), the position of 0.5-1 m is the pressure relief buffer zone 3.

[0055] In this embodiment, by setting the pressure relief buffer zone 3, the roadway and the filled wall 1 have a certain distance. When the roof collapses, the rock first falls into the pressure relief buffer zone 3. When the rock accumulation in the pressure relief buffer zone 3 reaches the saturation of the pressure relief buffer zone 3, the rock will only produce a pushing force to the filled wall 1. Therefore, the setting of the pressure relief buffer zone 3 improves the time of roadway convergence and deformation, thereby improving the service life of the roadway, reducing the frequency of roadway maintenance, fundamentally reducing the cost of roadway maintenance, improving the safety of mine roadway, and greatly improving the economic benefit of the mine.

[0056] Embodiment 4

[0057] Based on embodiment 1, the grouting in step 4) comprises the following steps:

[0058] a. The slurry is prepared by mixing water and ash in a mass ratio of 1.5:1;

[0059] b. The slurry is pressurized by using a double-liquid grouting pump, and then is delivered to the mixing pipe at the filling point through the double-liquid grouting pump connected with two high-pressure pipes. After the slurry is delivered out of the mixing pipe, the stop valve on the mixing pipe is closed, one end of the mixing pipe out of the slurry is inserted into the filling bag, and the end of the mixing pipe out of the slurry is tightly tied, and the grouting preparation work is completed.

[0060] Further, the discharge ends of the two high-pressure pipes are connected with the three-way connecting pipe, and the discharge end of the three-way connecting pipe is connected with the mixing pipe, so that the two high-pressure pipes deliver the pressurized slurry in the double-liquid grouting pump into the mixing pipe, and the mixing pipe pours the slurry into the filling bag.

[0061] Further, the preparation method of the slurry comprises the following steps: water and ash are mixed and stirred in a stirring barrel for 3-5 min to prepare the slurry.

[0062] Further, the length of the mixing pipe is 10-20 m.

[0063] Further, the high-pressure pipe is a rubber pipe that can withstand a pressure higher than 16 MPa, and the inner diameter of the high-pressure pipe is 25 mm to 32 mm.

[0064] In this embodiment, the slurry is continuously mixed and prepared by using two stirring barrels. The water supply pipe gate valve is opened, water is added in the stirring barrel, the double-liquid grouting pump is started, and after confirming that the water out of the mixing pipe at the filling point is normal, the double-liquid grouting pump is stopped. When the water is added to the specified position, the stirring barrel switch is started and the ash is added for stirring and mixing. After stirring for 3-5 min, the double-liquid grouting pump is started, the double-liquid grouting pump pressurizes the two kinds of slurry respectively, and the two high-pressure pipes connected with the double-liquid grouting pump respectively deliver the two kinds of slurry to the slurry mixing pipe. After the slurry is delivered out of the slurry mixing pipe, the stop valve on the slurry mixing pipe is closed, one end of the slurry mixing pipe out of the slurry is inserted into the filling bag, and the slurry mixing pipe is tightly tied. Grouting is performed, and when the liquid level of the slurry in the filling bag reaches 0.3 m from the top plate, the grouting speed is reduced, and the slurry is slowly grouted until the slurry mixing pipe is pulled out after the slurry contacts the top plate, and the slurry mixing pipe is punched into the goaf. Clean water is added into the stirring barrel to clean the grouting pipe and the stirring barrel. After the clean water out of the grouting pipe at the filling point and the stirring barrel are cleaned, the stirring barrel and the grouting pump switches are stopped, and the filling is completed.

[0065] In the embodiment, the wall body 1 is filled with slurry delivered by a double-liquid filling and grouting pump, which is simple and reasonable in structure, convenient to maintain, can realize long-distance slurry delivery, and the slurry in the two stirring barrels is not solidified during separate stirring and delivery. The slurry pressurized by the double-liquid grouting pump is then discharged through a slurry mixing pipe, so that the mixed slurry can be quickly solidified to accelerate the forming of the filling wall body. The two stirring barrels are used to continuously prepare the slurry, so as to realize continuous and uninterrupted grouting of the slurry and improve the work efficiency.

[0066] The above-described embodiments only express the specific implementation manners of the present application, which are described in detail, but should not be understood as the limitation of the protection scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A method of re-creating high-strength roadside pressure relief rapid filling into a lane support, characterized by, The method comprises the following steps: 1) roadway surrounding rock expansion: the roadway surrounding rock is divided into multiple modules for expansion, and the expansion width and length of each module are 2-3 m and 2-5 m respectively; 2) temporary support of the roof: after the roadway surrounding rock expansion, anchor rods (2) are used to reinforce the roadway surrounding rock expansion area (4) as temporary support; 3) formwork erection beside the roadway: along the direction of the roadway, steel mesh (5) is laid at a distance of 0.5-1 m from the two sides of the roadway, the height of the steel mesh (5) reaches the roof, the steel mesh (5) is penetrated by counter-pulling anchor rods (6) and steel ladders (8) are installed, and finally filling bags are hung on the steel mesh (5); in step 3), the position of 0.5-1 m is a pressure relief buffer zone (3); 4) wall filling: the compressed air pipe is inserted into the filling bag air sleeve and the compressed air is turned on, then the slurry outlet end of the slurry mixing pipe is inserted into the filling bag for grouting, when the slurry surface is 0.3 m away from the roof, the grouting is slowly carried out, and the grouting is stopped after the slurry contacts the roof, and the wall (1) filling is completed; the construction of the two sides is carried out separately, and the construction of one side is stopped when the construction length reaches 20-30 m, and then the construction of the other side is carried out after the filling wall (1) reaches the preset strength; according to the stability of the roof of the roadway surrounding rock, the construction of the side with lower stability is carried out first.

2. A method of re-creating high strength roadside pressure relief rapid filling into lane support as claimed in claim 1, characterized in that, in step 2), the roadway surrounding rock expansion area (4) can also be temporarily supported by anchor cables (5) or sheds.

3. A method of re-creating high strength roadside pressure relief rapid filling into lane support as claimed in claim 1, characterized in that, in step 3), the temporary single column (7) for temporarily supporting the roof around the steel mesh (5) is set.

4. A method of re-creating high strength side entry pressure relief rapid filling into roadway support as claimed in claim 1, characterized in that, in step 3), the steel mesh (5) is made of steel bars, the overlapping parts of the steel bars are tightly bound with iron wire, and the diameter of the steel bars is 6 mm.

5. A method of re-creating high strength side entry pressure relief rapid filling into roadway support as claimed in claim 1, characterized in that, in step 4), the grouting comprises the following steps: a. the slurry is prepared by mixing water and ash in a mass ratio of 1.5:1; b. the slurry is pressurized by using a double-liquid grouting pump, then transported to the slurry mixing pipe at the filling point through two high-pressure pipes connected to the double-liquid grouting pump, when the slurry is transported out of the slurry mixing pipe, the stop valve on the slurry mixing pipe is closed, the slurry mixing pipe outlet end is inserted into the filling bag, and the slurry mixing pipe outlet end is tightly tied, and the grouting preparation work is completed.

6. A method of re-establishing high strength roadside pressure relief rapid filling into a lane support as claimed in claim 5, characterized in that, The preparation method of the slurry comprises the following steps: water and ash are mixed and stirred in a stirring barrel for 3-5 min to prepare the slurry.

7. A method of re-creating high strength side entry pressure relief rapid filling into roadway support as claimed in claim 5, characterized in that, The high-pressure pipe is a rubber pipe that can withstand a pressure higher than 16 MPa.

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