CN115839255B - Mine anchor cable pressure air quantitative squeezing device and precise anchoring method - Google Patents
Mine anchor cable pressure air quantitative squeezing device and precise anchoring methodInfo
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- CN115839255B CN115839255B CN202211544545.XA CN202211544545A CN115839255B CN 115839255 B CN115839255 B CN 115839255B CN 202211544545 A CN202211544545 A CN 202211544545A CN 115839255 B CN115839255 B CN 115839255B
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Abstract
本发明公开一种矿用锚杆索压风定量挤注装置及精准锚固方法，适用于煤矿巷道围岩支护工程领域。包括气动双杆气缸、罐装瓶与混合器，利用气动双杆气缸中风向控制阀调整导杆的前后移动方向，带动罐装瓶实现出浆和拆除的功能；在风压作用下罐装瓶中双组分粘结剂不断被挤出，经混合器充分搅拌后，粘结剂不断被输送至锚杆索端部出浆口，进而根据事先测得的围岩裂隙位置设计锚固长度进一步实现锚杆索的精准锚固。每个钻孔对应一组罐装瓶，方便井下施工，并且根据巷道整体情况设定罐装瓶容量，有利于实现特定裂隙区域的精准粘固，充分利用井下少有的压缩空气动力源，操作方便，应用性强。
The present invention discloses a device for quantitative air pressure injection and precise anchoring of mining anchor cables, which are applicable to the field of surrounding rock support engineering in coal mine tunnels. It comprises a pneumatic double-rod cylinder, a canned bottle and a mixer. The wind direction control valve in the pneumatic double-rod cylinder is used to adjust the forward and backward movement direction of the guide rod, driving the canned bottle to realize the functions of slurry discharge and removal. Under the action of wind pressure, the two-component adhesive in the canned bottle is continuously squeezed out. After being fully stirred by the mixer, the adhesive is continuously transported to the slurry outlet at the end of the anchor cable, and then the anchoring length is designed according to the pre-measured surrounding rock crack position to further realize the precise anchoring of the anchor cable. Each borehole corresponds to a group of canned bottles, which is convenient for underground construction, and the canned bottle capacity is set according to the overall situation of the tunnel, which is conducive to achieving precise bonding in specific crack areas, making full use of the rare compressed air power source underground, easy to operate, and highly applicable.
Description
Technical Field
The invention relates to a quantitative extrusion device for mining anchor rod rope compressed air and an accurate anchoring method, which are particularly suitable for the field of surrounding rock supporting engineering of coal mine roadways.
Background
The anchor rod rope anchoring technology can greatly improve the rock strength and the rock stratum integrity, and has become a main technical means for controlling the stability of surrounding rock of a coal mine roadway.
The current anchoring technology mainly relies on a resin anchoring agent to bond the anchor rod body and the surrounding rock together, and the resin anchoring agent is formed by dividing and packaging the cement and the curing agent by a special polyester film, so that the bonding force between the resin anchoring agent and the surrounding rock can be optimized only by fully mixing the cement and the curing agent. The method comprises the steps of (1) mixing and hardening the adhesive cement and the curing agent to form a weak surface, reducing the adhesive force to a certain extent, and (2) when surrounding rock is broken or drilling is not well formed, the resin anchoring agent can be blocked and can not be pushed to the bottom of a hole, so that the resin anchoring agent is discontinuously anchored when the surrounding rock is anchored, and is insufficiently mixed, the anchoring force is reduced, and (3) the anchoring length formed by stirring the resin anchoring agent is limited, so that only end anchoring and lengthening anchoring can be generally achieved, and for some weak surrounding rock or water-rich surrounding rock tunnels, the anchoring mode has the risk of insufficient anchoring strength, full-length anchoring is required, but the anchor drilling capability is insufficient, and the problem of insufficient stirring or advanced hardening of the anchoring agent exists due to excessive anchoring agent. The three problems directly affect the stability control effect of the surrounding rock of the roadway, and the conditions of roadway collapse and the like can be generated when serious.
In recent years, there has been a certain search for an anchor reliability technique. In order to achieve the full mixing of the cement and the curing agent in the resin anchoring agent, a pre-stress full-length anchoring method for adding steel sand by a post-pouring method is proposed in the patent CN111927514B, and the mixing degree of the resin anchoring agent is improved by adding small-particle-size steel sand in a drilled hole, but the construction process is very complex, and the construction efficiency of the anchor rod rope is severely restricted. The patent CN103161484B proposes a fixed-length anchoring and supporting method of paste, which thoroughly eliminates the anchoring method of anchoring agent, a plastic hose is put into a borehole, the prepared paste slurry is injected into the borehole through the plastic hose by using a grouting pump, and then an anchor rod rope is inserted into the borehole. In order to realize the control of weak surrounding rock roadway, full length anchoring technology has become trend, but full length anchoring completely seals the free section of the anchor rope, so that the surrounding rock does not have the characteristic of buffering and yielding. Therefore, there is a need for a method of precisely anchoring a bolt cable and an extrusion device for achieving rapid and precise anchoring.
Disclosure of Invention
Technical problems: the invention aims to overcome the defects of the prior art, and provides a quantitative extrusion device for mining anchor rod cable compressed air and an accurate anchoring method, the device has simple structure, the device is convenient to use in a narrow space of a roadway, the reliability of an anchoring system is improved by means of the accurate anchoring method formed by the device, the construction efficiency of an anchor rod rope is improved, and the technical effect is remarkable.
The mining anchor rod rope compressed air quantitative squeezing device comprises a squeezing grouting device, wherein a tank bottle is arranged in the squeezing grouting device, the squeezing grouting device comprises a pneumatic double-rod cylinder arranged behind the tank bottle, a mixer connected with a discharge hole of the tank bottle and used for mixing various materials is arranged at the end part of the squeezing grouting device, and the mixed materials are output by the mixer; the pneumatic double-rod cylinder of the extrusion grouting device comprises a guide rod and a wind bin for driving the guide rod, the number of the guide rod is matched with the number of the canning bottles, the bottom of the guide rod is a piston arranged in the wind bin, a rodless cavity of the wind bin is a wind bin I, a rod cavity is a wind bin II, the wind bin I is connected with a pressure gauge, an air inlet and an air outlet II are arranged on the side of the wind bin I, an air outlet I is arranged on the side of the wind bin II, a wind direction control valve is further arranged on the wind bin, the wind direction control valve is respectively connected with an inner air pipe I, an inner air pipe II and an inner air pipe III, the inner air pipe I is an air inlet pipe, air is always fed to the wind direction control valve from the air inlet, when the guide rod is pushed, the guide rod is pushed to extrude a bottling bottle through the inner air pipe II, the air is fed to the inner air pipe III by the wind direction control valve to the wind bin II, so that the air exchanging effect is realized by reversely pushing the guide rod, the canning bottles comprise a detachable bottle I and a detachable bottle II, which are respectively provided with a binder, and a detachable bin I and a detachable bottle II are respectively connected with the detachable bottle and a detachable bottle can I and a detachable bottle can be detached from the bottle and a detachable bottle I, which are respectively arranged at the tail of the detachable bottle bin, can dismantle jar bottle I and can dismantle jar bottle II's discharge gate and be connected with the blender through the play thick liquid mouth respectively, the blender includes mixing stirring portion, and mixing stirring portion's entry is connected respectively with the play thick liquid mouth through plastics advance thick liquid pipe, and mixing stirring portion's export is equipped with the connector through going out thick liquid pipe, is equipped with the roller bearing in the mixing stirring portion, is equipped with cross plastic flabellum on the roller bearing.
The mining anchor rope comprises an anchor rope main body, wherein a grouting channel for realizing end grouting is arranged in the anchor rope main body, a grouting port of the anchor rope main body is arranged on the side face of the end of the anchor rope, and the anchor rope main body is designed without an anchor section, and an anchor section plugging structure is not needed.
Further, according to the requirement of the anchoring length, a plugging structure for realizing the flow of slurry is arranged on the main body of the anchor rod rope, the slurry injected from the end part of the anchor rod rope is limited in a drilling space between the plugging structure and the bottom of a drilling hole by using the plugging structure, the fixed-length grouting anchoring without anchoring agent is realized, and the plugging structure comprises slurry stopping cotton or an expansion air bag which can be rapidly expanded when meeting water.
The grouting channel is a hollow grouting steel pipe arranged in the anchor cable, the outer diameter of the anchor cable hollow grouting steel pipe is 7-9 mm, the inner diameter of the anchor cable hollow grouting steel pipe is 4-6 mm, the grouting channel is a circular hollow channel arranged in the anchor rod, and the inner diameter of the circular hollow channel of the anchor rod is 4-6 mm.
A quick fixed-length grouting method for a mining anchor rope includes setting anchor rope drilling holes in an area where anchor rope support is needed, putting the mining anchor rope with grouting channels and end grouting openings into the anchor rope drilling holes, grouting through the grouting channels on the anchor rope main body, and installing a tray and a fastening nut at the tail end of the anchor rope after grout is solidified.
Further, installing a blocking structure on the corresponding position of the anchor rod rope for the grouting hole according to the position of the surrounding rock fracture zone detected in advance, controlling the generation of a grouting section through the blocking structure, placing the mining anchor rod rope and the blocking structure in a drill hole, then quantitatively grouting the anchor rod rope by a grouting device through a grouting channel and a grouting outlet, and installing a tray and a fastening nut at the tail end of the anchor rod rope main body after the grout is solidified.
Further, the tail end of the anchor rod rope is provided with a rubber plug, the anchor rod rope and the rubber plug, the tray, the nut or the lockset are pushed into a drilled hole together, the grouting device is utilized to implement quick full-length grouting anchoring on the anchor rod rope, and the anchor rod rope is installed after the grout is solidified without applying pretightening force.
According to the accurate anchoring method of the mining anchor rod rope compressed air quantitative extrusion device, the A material bottle and the B material bottle which are mixed to form the adhesive for fixed-length grouting are accurately and quantitatively filled according to the requirement of a single anchoring drilling hole in the area, so that the filling bottle of the adhesive is enabled to form the optimal grouting amount which is matched with the anchoring hole in the geological area, a worker only needs to install the filling bottle for accurate quantitative grouting into grouting equipment, and can finish accurate quantitative grouting after all the grouting is performed on the grouting equipment, the steps are simple, operation errors cannot occur, and the anchoring effect formed after accurate grouting is best.
The method comprises the following specific steps:
S1, in order to efficiently and rapidly control roadway deformation, the roadway deformation is required to be accurately anchored to a weak surrounding rock or a crack development position, namely, the crack distribution of the surrounding rock of the coal mine roadway is explored, a roadway support mode and the length L' of a hollow anchor rod cable are designed, the anchoring length L of the hollow anchor rod cable is obtained according to the crack distribution condition, specifically, the length from the bottom of a drilling hole to the position where the crack is located is calculated, and the required volume V of the binder for grouting is calculated at the moment as follows:
V=1/4π(D2-D'2)L+1/4πd2L’
Wherein D is the diameter of a drilling hole, D' is the diameter of an anchor rod rope, and D is the diameter of a hollow anchor rod rope hollow tube;
S2, according to the volume V of the grouting adhesive required by each drilling hole, obtaining the required quantity of materials A and B which are combined with each other to generate the volume V adhesive, and respectively filling the two kinds of mixed materials into a detachable tank bottle I and a detachable tank bottle II, so as to ensure that the two kinds of mixed materials are extruded from a slurry outlet in a ratio required by the adhesive after the guide rod synchronously extrudes the detachable tank bottle I and the detachable tank bottle II;
s3, drilling a drill hole corresponding to the hollow anchor rod cable at a preset position according to a supporting scheme, installing the hollow anchor rod, the tray and the nut or the hollow anchor cable, the tray and the lockset in place in advance, pushing the nut or the lockset by using the drilling machine to move the hollow anchor rod cable into the hole, and keeping the drilling machine motionless;
S4, connecting an air inlet of the quantitative extrusion device with an air pipe in the roadway, and connecting a connector of the quantitative extrusion device with the tail of the hollow anchor rod rope.
S5, a wind direction control valve in the quantitative squeezing device is used for controlling a guide rod to move forwards under the action of compressed wind, gas is discharged from an air outlet I, materials A and B in a detachable bottle I and a detachable bottle II are simultaneously squeezed into a mixer by the guide rod, two slurries react with each other at an inlet of a mixing and stirring part, the mixed adhesive sequentially passes through two cross plastic blades along with the continuous forward pushing of the guide rod, a rolling shaft is driven to rotate together, the adhesive is fully mixed, the adhesive is conveyed to the bottom of a hollow anchor rod cable hole through a plastic slurry outlet pipe, and then the adhesive flows to a specific crack area along the hole wall, so that the accurate anchoring of an anchor rod cable is realized;
S6, controlling the guide rod to retract by utilizing a wind direction control valve in the quantitative squeezing device, discharging the gas from the air outlet II, removing the canning bottles of the adhesive I and II, and after the guide rod is restored to the original position, installing the next group of canning bottles, and preparing for anchoring of the next anchor rod rope.
And S7, after the construction of one production class is finished, the mixer is removed and replaced.
10. The precise anchoring method according to claim 9, wherein the total amount of the materials A and B filled in the detachable tank bottle I and the detachable tank bottle II is equal to the total requirement of anchoring grouting in the whole section of roadway, the use amount of the anchoring adhesive in each drilling hole is equal, the diameter d 'of the tank bottle is known, the total length l=4 kV/(d 2 pi) of the tank bottle is obtained, k is a margin coefficient, the length l' =1/2 l of a single tank bottle is obtained, the materials A and B slurry are respectively filled in two tank bottles, and the moving distance of the guide rod is calculated according to the injection amount when the anchor rod is used for each injection.
The beneficial effects are that:
① The detachable raw materials in the tank bottle can be fixedly assembled into a group for each drilling hole, so that the calculation of staff is not needed, the operation is convenient, and the setting can be performed according to the total amount of the roadway, and the preset adhesive slurry can be pressed in each time;
② The setting time of the binder is adjustable, and the accurate reinforcement of the hollow anchor rod rope under different surrounding rock conditions can be realized according to the requirements;
③ The defects of uneven mixing of the anchoring agent and low anchoring quality in the traditional anchor rod cable stirring process are overcome, the end anchoring is not required by the resin anchoring agent, and the construction can be completed by one-time grouting anchoring;
④ The underground compressed air power source is fully utilized, and the operation and construction are convenient.
Drawings
FIG. 1 is a schematic diagram of a mining anchor rope compressed air quantitative extrusion device of the invention;
FIG. 2 is a schematic cross section of a pneumatic double-rod cylinder of the mining anchor rod rope compressed air quantitative squeezing device;
FIG. 3 is a schematic view of a wind direction control valve O gear of the mining anchor rope compressed air quantitative squeezing device;
FIG. 4 is a schematic view of a wind direction control valve A of the mining anchor rope compressed air quantitative squeezing device;
FIG. 5 is a schematic diagram of a wind direction control valve B of the mining anchor rope compressed air quantitative squeezing device;
FIG. 6 is a schematic view of the forward movement of a pneumatic double-rod cylinder A gear guide rod of the mining anchor rod cable compressed air quantitative squeezing device;
FIG. 7 is a schematic drawing showing the retraction of a B gear guide rod of a pneumatic double-rod cylinder of the mining anchor rod cable compressed air quantitative squeezing device;
in the figure: 1-pneumatic double-rod air cylinder, 1-air inlet, 1-2-wind direction control valve, 1-3-pressure gauge, 1-4-guide rod, 1-5-canning bottle storage bin, 1-6 to air outlet I,1-7 to air outlet II,1-8 to air bin I,1-9 to air bin II,1-10 to inner air pipe I,1-11 to inner air pipe II,1-12 parts of inner air pipe III,2 parts of tank bottles, 2-1 parts of detachable tank bottles I,2-2 parts of detachable tank bottles II,3 parts of mixers, 3-1 parts of plastic slurry inlet pipes, 3-2 parts of mixing and stirring parts, 3-3 parts of rollers, 3-4 parts of cross plastic fan blades, 3-5 parts of plastic slurry outlet pipes and 3-6 parts of connectors.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
As shown in figures 1 and 2, the mining anchor rod rope compressed air quantitative squeezing device comprises a squeezing grouting device, wherein a tank bottle 2 is arranged in the squeezing grouting device, the squeezing grouting device comprises a pneumatic double-rod air cylinder 1 arranged behind the tank bottle 2, the end part of the squeezing grouting device is provided with a mixer 3 connected with a discharge hole of the tank bottle 2 and used for mixing various materials, the mixer 3 outputs the mixed materials, the pneumatic double-rod air cylinder 1 of the squeezing grouting device comprises guide rods 1-4 and air bins used for driving the guide rods 1-4, the number of the guide rods 1-4 is matched with that of the tank bottle 2, the bottom of the guide rods 1-4 is a piston arranged in the air bins, a rodless cavity of the air bins is a air bin I1-8, the rod cavity is provided with two parts of air bins II1-9, the air bins I1-8 are connected with pressure gauges 1-3, the air bins I1-8 are provided with air inlets 1-1 and air outlets II-7, the air outlets I1-6 are arranged on the air bin II-9, the air bins I-1-6 are respectively provided with air inlets 1-2 and air inlets I-1-2, and air inlets I-1-2 are respectively connected with air inlets 1-1 and 1-2;
When the guide rod 1-4 is pushed, the air is conveyed to the inner air pipe II1-11 by the air direction control valve 1-2 to enter the air bin I1-8, the guide rod 1-4 advances, when the guide rod 1-4 is required to be retracted, the air is conveyed to the inner air pipe III1-12 by the air direction control valve 1-2 to enter the air bin II1-9, so that the ventilation effect is realized, the canned bottle 2 comprises a detachable canned bottle I2-1 and a detachable canned bottle II2-2, the detachable canned bottle I2-1 and the detachable canned bottle II2-2 are respectively provided with materials A and B which can form an adhesive after being mixed, the detachable canned bottle I2-1 and the detachable canned bottle II-2 are arranged in the canned bottle storage bin 1-5, the tail parts of the detachable canned bottle I2-1 and the detachable canned bottle II-2 are respectively connected with one guide rod 1-4 for extrusion discharging, the detachable canned bottle I2-1 and the detachable bottle II-2 are respectively connected with the mixer 3 through the pulp outlet 2-3, the mixer 3 comprises a mixing part 3-2, the mixing part 3 and the plastic stirring part 3-3 are respectively provided with the blade 3-3 through the pulp inlet and 3-3 and the cross-3 roller, and the mixing part is respectively provided with the mixing part 3-3 and the stirring part is provided with the stirring roller 3-3 and the inlet and 3-3 and the stirring part 3.
As shown in figures 3, 4 and 5, the control valve of the wind direction control valve 1-2 comprises an O gear, an A gear and a B gear, wherein the inner air pipe I1-10 is closed in the O gear, the inner air pipe I1-10 is communicated with the inner air pipe II1-11 in the A gear, and the inner air pipe I1-10 is communicated with the inner air pipe III1-12 in the B gear.
The mining anchor rope comprises an anchor rope main body, wherein a grouting channel for realizing end grouting is formed in the anchor rope main body, a grouting port of the anchor rope main body is formed in the side face of the end of the anchor rope, and the anchor rope main body is not required to be provided with an anchor section plugging structure. According to the requirement of the anchoring length, a plugging structure for realizing the flow of slurry limited by fixed-length grouting is arranged on the anchor rod rope main body, slurry injected into the end part of the anchor rod rope is limited in a drilling space above the plugging structure by using the plugging structure, the fixed-length grouting anchoring is realized, and the plugging structure comprises slurry stopping cotton or an expansion air bag which can be rapidly expanded when meeting water. The grouting channel is a hollow grouting steel pipe arranged in the anchor rope, the outer diameter of the anchor rope hollow grouting steel pipe is 7-9 mm, the inner diameter of the anchor rope hollow grouting steel pipe is 4-6 mm, the grouting channel is a circular hollow channel arranged in the anchor rod, and the inner diameter of the circular hollow channel of the anchor rod is 4-6 mm.
A quick fixed-length grouting method for a mining anchor rope includes setting anchor rope drilling holes in an area where anchor rope support is needed, putting the mining anchor rope with grouting channels and end grouting openings into the anchor rope drilling holes, grouting through the grouting channels on the anchor rope main body, and installing a tray and a fastening nut at the tail end of the anchor rope main body after grout is solidified. According to the position of the surrounding rock fracture zone detected in advance, installing a blocking structure, controlling the position of subsequent grouting through the blocking structure, placing the anchor rod rope and the blocking structure in a drill hole, then quantitatively grouting the anchor rod rope by a fixed length through a grouting channel and a grouting outlet by using a grouting device, and installing a tray and a fastening nut at the tail end of the anchor rod rope main body after waiting for solidification of grout. The tail end of the anchor rod rope is provided with a rubber plug, the anchor rod rope and the rubber plug, the tray, the nut or the lockset are pushed into a drilled hole together, the grouting device is utilized to implement quick full-length grouting anchoring on the anchor rod rope, and the anchor rod rope is installed after the grout is solidified without applying pretightening force.
According to the accurate anchoring method of the mining anchor rod rope compressed air quantitative squeezing device, the adhesive of fixed-length grouting is accurately and quantitatively filled according to the regional requirement, so that the canning bottle of the adhesive forms the optimal grouting amount adapting to the anchoring of the geological region, a worker only needs to install the canning bottle of the accurate quantitative filling into grouting equipment and complete the accurate quantitative grouting after full injection, the steps are simple, operation errors cannot occur, and the anchoring effect formed after the accurate grouting is best.
The method comprises the following specific steps:
S1, in order to better control roadway deformation, the roadway deformation needs to be accurately anchored to a weak surrounding rock or a crack development position, namely, the crack distribution of the surrounding rock of the coal mine roadway is explored, a roadway support mode and the length L' of a hollow anchor rod cable are designed, the anchoring length L of the hollow anchor rod cable is obtained according to the crack distribution condition, specifically, the length from the bottom of a drilling hole to the position where the crack is located is calculated, and the required volume V of the binder for grouting is calculated at the moment as follows:
V=1/4πD2-D'2L+1/4πd2L’
Wherein D is the diameter of a drilling hole, D' is the diameter of an anchor rod rope, and D is the diameter of a hollow anchor rod rope hollow tube;
S2, according to the volume V of grouting adhesive required by each drilling hole, obtaining a material A and a material B of which the filling compositions are combined with each other to generate the volume V adhesive, filling the two kinds of mixture into a detachable tank bottle I2-1 and a detachable tank bottle II2-2 respectively, and ensuring that a guide rod 1-4 synchronously extrudes the detachable tank bottle I2-1 and the detachable tank bottle II2-2 so that the extruded two kinds of mixture keep the proportion requirement of the adhesive;
s3, drilling a drill hole corresponding to the hollow anchor rod cable at a preset position according to a supporting scheme, installing the hollow anchor rod, the tray and the nut or the hollow anchor cable, the tray and the lockset in place in advance, pushing the nut or the lockset by using the drilling machine to move the hollow anchor rod cable into the hole, and keeping the drilling machine motionless;
s4, connecting an air inlet 1-1 of the quantitative squeezing device with an air pipe in the roadway, and connecting a connector 3-6 of the quantitative squeezing device with the tail of the hollow anchor rod rope.
S5, utilizing a wind direction control valve 1-2 in the quantitative squeezing device to control a guide rod 1-4 to move forwards under the action of compressed wind, discharging gas from an air outlet I1-6, simultaneously pumping materials A and B in a detachable bottle I2-1 and a detachable bottle II2-2 into a mixer 3, enabling two slurries to react with each other at an inlet of a mixing and stirring part 3-2, enabling the mixed adhesive to sequentially pass through two cross plastic fan blades 3-4 along with the forward pushing of the guide rod 1-4, driving a roller 3-3 to rotate together, enabling the adhesive to be fully mixed, enabling the adhesive to be conveyed to the bottom of a hollow anchor rod cable hole through a plastic slurry outlet pipe 3-5, and enabling the adhesive to flow to a specific crack area along the hole wall, so as to realize the accurate anchoring of the anchor rod cable;
S6, controlling the guide rod 1-4 to retract by utilizing the wind direction control valve 1-2 in the quantitative squeezing device, discharging the gas from the air outlet II1-7, removing the canning bottles of the adhesive I and II, and after the guide rod 1-4 is restored to the original position, installing the next group of canning bottles 2 to prepare for the anchoring of the next anchor rod rope, wherein the anchoring is shown in fig. 6 and 7;
and S7, after the construction of one production class is finished, the mixer 3 is disposed.
The material A and the material B filled in the detachable tank bottle I2-1 and the detachable tank bottle II2-2 are the sum of anchoring grouting in a section of roadway, the use amount of the anchoring adhesive in each drilling hole is the same, the diameter d 'of the tank bottle is known, the total length l=4 kV/(d 2 pi) of the tank bottle 2 is obtained, k is a margin coefficient, the length l' =1/2 l of a single tank bottle is obtained by calculating the moving distance of the guide rod 1-4 according to the injection amount when the anchor rod is used for each injection.
Claims (9)
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| CN110359930A (en) * | 2019-07-20 | 2019-10-22 | 湖南科技大学 | A kind of grouting system and its fire extinguishing method for easily broken rocks |
| CN111255515A (en) * | 2020-03-20 | 2020-06-09 | 王经明 | A rapid self-built sluice wall system containing gallbladder and its installation method and application |
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| CN110359930A (en) * | 2019-07-20 | 2019-10-22 | 湖南科技大学 | A kind of grouting system and its fire extinguishing method for easily broken rocks |
| CN111255515A (en) * | 2020-03-20 | 2020-06-09 | 王经明 | A rapid self-built sluice wall system containing gallbladder and its installation method and application |
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