CN110566254A - Grouting anchor cable hole sealing device and grouting anchor cable - Google Patents
Grouting anchor cable hole sealing device and grouting anchor cable Download PDFInfo
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- CN110566254A CN110566254A CN201910954130.1A CN201910954130A CN110566254A CN 110566254 A CN110566254 A CN 110566254A CN 201910954130 A CN201910954130 A CN 201910954130A CN 110566254 A CN110566254 A CN 110566254A
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- grouting
- piston
- anchor cable
- grout
- piston cavity
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
Abstract
The invention relates to a grouting anchor cable hole sealing device and a grouting anchor cable, belongs to the technical field of grouting anchor cable equipment, and solves the problems that automatic hole sealing cannot be realized and a grouting effect is poor in the existing grouting anchor cable. A grouting anchor cable hole sealing device comprises a shell, a spring and a grout stopping piston, wherein a piston cavity for mounting the grout stopping piston is formed in the shell, and the grout stopping piston is arranged in the piston cavity and can move in the piston cavity under the action of pressure of grout; one end of the slurry stopping piston is fixedly connected with the bottom wall of the piston cavity through a spring, and the other end of the slurry stopping piston can be contacted with slurry in the piston cavity; the shell is provided with an inflow channel and an outflow channel, and the inflow channel and the outflow channel are respectively communicated with the outflow piston cavity through the inflow port; the inflow channel and the piston cavity are always in a communicated state, and the outflow channel and the piston cavity are in a communicated state and a disconnected state through the movement of the slurry stopping piston in the piston cavity. The invention realizes the automatic hole sealing of the grouting anchor cable, improves the working efficiency and has good grouting effect.
Description
Technical Field
The invention relates to the technical field of grouting anchor cable equipment, in particular to a hollow grouting anchor cable hole sealing device and a grouting anchor cable for supporting in mines, tunnels and underground engineering, and particularly relates to a grouting anchor cable hole sealing device and a grouting anchor cable.
Background
In underground engineering such as mine roadways, subways and tunnels, for rock bodies with developed, constructed and broken cracks, especially underground engineering with large pressure, grouting anchor cables are needed to reinforce the rock bodies so as to improve the self bearing capacity of surrounding rocks. The grouting anchor cable can effectively inhibit the generation of joints and cracks inside the surrounding rock, can also prevent the secondary damage of the rock mass inside the surrounding rock and the grouting slurry to form a bonded rock body, and injects certain slurry which can be well consolidated with the rock-soil body into the structures such as pores, cracks and the like of the rock-soil body, so that the rock-soil body becomes a new structure body with high strength, good impermeability and high stability, thereby achieving the purpose of improving the physical and mechanical properties of the rock-soil body. The rock mass after grouting reinforcement can provide higher anchoring force for the grouting anchor cable, and the reinforced integral rock mass is favorable for high prestress to be transmitted to the deep part of the rock mass, so that vertical load acting on the top plate can be effectively transmitted to the two sides, and the load can be transmitted to the bottom plate through reinforcement of the sides; meanwhile, the thickness of the combined arch is increased, so that the load concentration acting on the bottom plate is reduced, the bottom plate is stable, and the floor heave phenomenon is reduced; the bottom plate is stable and contributes to the stability of the two sides, and the bottom plate and the two sides are stable and can keep the stability of the top plate.
The conventional hole sealing device for the grouting anchor cable mainly comprises a grout stop plug and a screwed plug for hole sealing, so that grout flows out after grouting is finished, a hole cannot be tightly sealed, the phenomena of grout leakage, grout leakage and pressure relief are frequently caused, the grouting effect of a deep broken zone is not obvious, and the high-pressure grouting reinforcement effect cannot be achieved; in underground works such as mine roadways, subways and tunnels, geological conditions are complex and changeable, the traditional grouting mode is still adopted under the condition that the roof crushing degree and the lithology change are large, slurry flows out, cracks are further expanded under the high-pressure grouting condition, the grouting process is not visually monitored, and the grouting pressure and the tightness of a hole sealing device directly influence the grouting effect.
therefore, it is necessary to provide a plugging device capable of testing the slurry pressure of a grouting anchor cable and the grouting anchor cable.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a grouting anchor cable hole sealing device and a grouting anchor cable, so as to solve the problems that the existing grouting anchor cable cannot realize automatic hole sealing, has low working efficiency, and has poor grouting effect.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the grouting anchor cable hole sealing device comprises a shell, a spring and a grout stopping piston, wherein a piston cavity for mounting the grout stopping piston is formed in the shell, and the grout stopping piston is arranged in the piston cavity and can move in the piston cavity under the action of the pressure of grout; one end of the grout stopping piston is fixedly connected with the bottom wall of the piston cavity through a spring, the other end of the grout stopping piston is a free end, and the free end can be contacted with grout in the piston cavity; the shell is provided with an inflow channel and an outflow channel, and the inflow channel and the outflow channel are respectively communicated with the first outflow piston cavity through a first inflow port; the inflow channel and the piston cavity are always in a communicated state, and the outflow channel and the piston cavity are in a communicated state and a disconnected state through the movement of the slurry stopping piston in the piston cavity.
Furthermore, the inflow channel and the outflow channel are respectively arranged on two sides of the central line of the piston cavity, and the inflow channel and the outflow channel are arranged in parallel.
Furthermore, the grouting anchor cable hole sealing device also comprises a pressure detection assembly, wherein the pressure detection assembly comprises a pressure gauge and a strain gauge, and the pressure gauge is connected with the strain gauge through a lead; the foil gage is embedded into the bottom wall of the piston cavity, and the foil gage is arranged between the spring and the bottom wall of the piston cavity.
Furthermore, a connecting plate is arranged between the spring and the strain gauge and fixedly connected with the end part of the spring, and the connecting plate can cover the strain gauge.
Furthermore, the tail end of the grout stopping piston is provided with a mounting groove for mounting a spring.
Furthermore, the shell is provided with an installation channel, the installation channel and the piston cavity are coaxially arranged, and the spring and the slurry stopping piston are installed in the piston cavity through the installation channel.
Furthermore, a limiting rod is arranged at the free end of the grout stopping piston, which is in contact with the grout, a limiting plate is arranged at the other end of the limiting rod, and the limiting plate is perpendicular to the limiting rod; the limiting plate can move in the installation channel and contact with the side wall laminating of installation channel.
On the other hand, the grouting anchor cable comprises a cable body and the grouting anchor cable hole sealing device, wherein the cable body is formed by spirally winding a plurality of steel strands on a grouting pipe; and the outflow channel of the grouting anchor cable hole sealing device is connected with the grouting port of the grouting pipe.
Furthermore, the grouting pipe is provided with a plurality of passage limiting assemblies, the plurality of passage limiting assemblies divide the grouting pipe into a plurality of segmented pipelines, and the passage limiting assemblies can separate two adjacent segmented pipelines and can be opened under the threshold pressure of the passage limiting assemblies to enable the two adjacent segmented pipelines to be communicated; the through limiting component is provided with a slurry outlet.
Furthermore, the through limiting assembly is an expansion pipe, the expansion pipe comprises a slurry inflow connecting section, an inward concave section and a slurry outflow connecting section which are sequentially connected, a second inflow port of the slurry inflow connecting section is connected with an adjacent upstream subsection pipeline, and a second outflow port of the slurry outflow connecting section is connected with an adjacent downstream subsection pipeline; the concave section is in a closed state in a natural state, the two adjacent sections of the segmented pipelines are disconnected and can be opened under certain hydraulic pressure, so that the two adjacent sections of the segmented pipelines are communicated.
Compared with the prior art, the invention has at least one of the following beneficial effects:
a) According to the grouting anchor cable hole sealing device provided by the invention, the grout stopping piston arranged in the shell can enable the first flow inlet to be communicated with the first flow outlet under the grouting pressure, and the grout stopping piston resets under the action of the compression spring after grouting is finished to block the first flow outlet, so that the inflow channel is disconnected from the outflow channel; still set up pressure measurement subassembly in the casing, pressure measurement subassembly is through the effort that detects compression spring, reaction slip casting pressure. The grouting anchor cable plugging device is simple in structure, can ensure unidirectional flow of slurry in the grouting anchor cable grouting process, can automatically plug a grouting opening of a grouting pipe, can prevent the problems of uneven grouting or unsatisfactory support after grouting and the like caused by shallow layer slurry leakage, can monitor the change of grouting pressure in real time, improves the grouting effect and the operation efficiency, reduces the grouting cost and ensures the support effect.
b) according to the grouting anchor cable provided by the invention, the grouting anchor cable hole sealing device is adopted to plug the grouting pipe, after grouting is finished, the grouting anchor cable hole sealing device can realize immediate automatic plugging of the grouting pipe, the outward leakage of slurry during grouting pipe plugging can be avoided, the grouting amount of deep rock stratum cracks is increased, the grouting reinforcement or plugging effect is further improved, manual intervention is not needed in the grouting pipe plugging process, the operation is convenient, shallow layer slurry leakage is effectively prevented, and the working efficiency is improved. The grouting anchor rope hole sealing device can detect grouting pressure in real time by arranging the pressure detection assembly, auxiliary evaluation is carried out on grouting effect according to the change condition of the grouting pressure, constant-pressure grouting is achieved, operation efficiency and supporting effect are improved, and the grouting anchor rope hole sealing device has important significance in improving safety and high-efficiency supporting work of underground engineering such as well work and tunnels.
c) According to the grouting anchor cable provided by the invention, the plurality of the through-limiting assemblies are arranged on the grouting pipe, the grouting pipe is divided into the plurality of segmented pipelines by the plurality of the through-limiting assemblies, each through-limiting assembly is provided with the slurry outlet, and the grouting can be sequentially filled into the downstream segmented pipelines by the upstream segmented pipelines under the flow limiting action of the through-limiting assemblies, so that segmented grouting control and multi-segmented grouting of a coal rock body are realized, the uniform diffusion filling of slurry in rock hole cracks around the anchor cable hole is ensured, the grouting amount is increased by 20% -30%, the grouting effect is obviously improved, the operation is convenient, and the working efficiency is improved by 30% -40%. The invention realizes the gradual grouting operation from the shallow part of the surrounding rock to the deep part by utilizing the sealing function of the through limiting component under certain pressure, improves the bearing capacity and the supporting effect of the anchor cable, and has obvious control, supporting and maintenance effects on the surrounding rock of the roadway with the stoping disturbance in a crack development zone and a top plate crushing zone.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
fig. 1 is a schematic structural view of a grouting anchor cable hole sealing device in a first embodiment of the present invention when grouting is not performed;
Fig. 2 is a schematic structural view of a grouting anchor cable hole sealing device during grouting according to a first embodiment of the invention;
FIG. 3 is a schematic diagram of a rock mass supported by grouting anchor cables in the second embodiment of the present invention;
fig. 4 is a schematic structural view of a grouting anchor cable according to a second embodiment of the present invention;
3 FIG. 3 5 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 in 3 FIG. 3 4 3; 3
Fig. 6 is a schematic structural view of an expansion pipe in the second embodiment of the present invention.
Reference numerals:
1. Grouting anchor cable hole sealing device; 1-1, pressure gauge; 1-2, leading-out wires; 1-3, a spring; 1-4, stop the thick liquid piston; 1-5, an inflow channel; 1-6, strain gauge; 1-7, an outflow channel; 1-8, a shell; 2-expansion pipe; 3-a cable body; 4-a lock; 5-a tray; 6-external grout stop plug; 7-coal rock mass; 8-grouting pipe; 9-a second inflow; 10-slurry outlet; 11-steel strand; 12-a pulp outlet; 13-anchor cable holes; 14-a second outflow port; 15-an outer anchoring section; 16-grouting an anchoring section; 17-a resin anchoring section; 18-an inflow connection section; 19-a concave inward section; 20-outflow connecting section.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
example one
The invention discloses a grouting anchor cable hole sealing device, which comprises a shell 1-8, a spring 1-3 and a grout stopping piston 1-4, wherein a piston cavity for mounting the grout stopping piston 1-4 is arranged in the shell 1-8, and the grout stopping piston 1-4 is arranged in the piston cavity and can move in the piston cavity, as shown in figures 1-2; one end of a grout stopping piston 1-4 is fixedly connected with the bottom wall of the piston cavity through a spring 1-3, the other end of the grout stopping piston 1-4 is a free end, the free end can be contacted with grout entering the piston cavity, namely, the tail end of the grout stopping plug 1-4 is connected with the spring 1-3, the head end of the grout stopping plug 1-4 can be contacted with the grout in the piston cavity, and the pressure of the grout can act on the end face of the head end of the grout stopping plug 1-4; the shell 1-8 is provided with an inflow channel 1-5 and an outflow channel 1-7, and the inflow channel 1-5 and the outflow channel 1-7 are respectively communicated with the first outflow piston cavity through a first inflow port. Wherein, the inflow channel 1-5 and the outflow channel 1-7 are respectively arranged at two sides of the central line of the piston cavity, preferably, the inflow channel 1-5 and the outflow channel 1-7 are arranged in parallel.
In the whole grouting process, the inflow channel 1-5 and the piston cavity are always in a communicated state, and the first inflow port is not shielded by the grout stopping piston 1-4; through the movement of the slurry stopping piston 1-4 in the piston cavity, the outflow channel 1-7 and the piston cavity have two states of connection and disconnection, and the slurry stopping piston 1-4 and the first outflow port have three position relations, namely the slurry stopping piston 1-4 completely shields the first outflow port, the slurry stopping piston 1-4 partially shields the first outflow port, and the slurry stopping piston 1-4 does not shield the first outflow port.
before grouting, the springs 1-3 are in an initial state, the springs 1-3 are not under the pressure action of the grouting pistons 1-4, the grouting stop pistons 1-4 do not shield the first inflow port, but completely shield the first outflow port, so that the outflow channels 1-7 are disconnected from the piston cavity, and the grout is blocked from flowing out through the outflow channels 1-7; during grouting, the grouting equipment supplies grout into the inflow channel 1-5, the grout entering the piston cavity from the inflow channel 1-5 exerts pressure on the free end face of the grout stopping piston 1-4, the grout stopping piston 1-4 moves in the piston cavity under the action of the pressure of the grout and compresses the spring 1-3, and the spring 1-3 stores energy in the compression process and has resilience capable of recovering the original state; when the grout stopping piston 1-4 partially blocks the first outflow port or does not block the first outflow port, the inflow channel 1-5 is communicated with the outflow channel 1-7 to form a passage allowing the grout to pass through, and the grout in the piston cavity enters the outflow channel 1-7 through the first outflow port and enters the grouting pipe 8. After grouting is completed, the pressure of grout in the piston cavity acting on the free end face of the grout stopping piston 1-4 is reduced, the grout stopping piston 1-4 moves towards the opposite direction of compression of the spring 1-3 under the action of the elastic force of the spring 1-3, the grout stopping piston 1-4 is reset, the first outflow port is completely shielded, and the outflow channel 1-7 is disconnected with the inflow channel 1-5.
in order to monitor the size of slurry injection pressure in real time, the grouting anchor cable hole sealing device further comprises a pressure detection assembly, as shown in fig. 1-2, the pressure detection assembly comprises a pressure gauge 1-1 and a strain gauge 1-6, and the pressure gauge 1-1 is connected with the strain gauge 1-6 through a lead 1-2; the strain gauge 1-6 is embedded into the bottom wall of the piston cavity, the strain gauge 1-6 is arranged between the spring 1-3 and the bottom wall of the piston cavity, and when the pressure gauge 1-1 can extrude the spring 1-3 through the slurry stop piston 1-4, the pressure exerted by the compressed spring 1-3 on the strain gauge 1-6 obtains the size of grouting pressure. Wherein, the strain gauges 1-6 can also be replaced by pressure sensors.
FIG. 1 shows a schematic structural diagram of a grouting anchor cable hole sealing device before grouting, wherein springs 1-3 are connected with grout stopping pistons 1-4, the grout stopping pistons 1-4 are tightly attached to shells 1-8, the springs 1-3 are not stressed and are in a natural state, and the grout stopping pistons 1-4 and the shells 1-8 divide inflow channels 1-5 and outflow channels 1-7 to block grout from flowing out; the strain gauge 1-3 is not acted by force, and the pressure gauge 1-1 is at the initial reading and the reading is 0.
Fig. 2 shows a structural schematic diagram of a grouting anchor cable hole sealing device during grouting, wherein an inflow channel 1-5 is connected with a grouting pump, grout flows in from the inflow channel 1-5 and enters a shell 1-8, a grout stop piston 1-4 is pushed under the action of the pressure of the grout, the grout stop piston 1-4 compresses a spring 1-3, the inflow channel 1-5 is communicated with an outflow channel 1-7, the grout flows into the outflow channel 1-7, the outflow channel 1-7 is connected with a grouting port of a grouting pipe 8, the grout enters the grouting pipe 8 through the grouting port and is injected into a coal rock body through a grout outlet 12, and the grouting anchoring effect is realized. In the process of pushing the grout stopping piston 1-4 under the action of the grout pressure, the grout stopping piston 1-4 pushes the spring 1-3 to enable the spring 1-3 to be in a stressed compression state, the strain gauge 1-6 is under the action of the pressure stress from the spring 1-3 and is conducted to the pressure gauge 1-1 along the outgoing line 1-2, the pressure gauge 1-1 displays the size of the grouting pressure, the real-time monitoring of the grouting pressure is realized, and the grouting effect is ensured.
In a preferable mode of the embodiment, a connecting plate is arranged between the spring 1-3 and the strain gauge 1-6 and fixedly connected with the end of the spring 1-3, the connecting plate can cover the strain gauge 1-6, when the spring 1-3 is compressed, the spring 1-3 applies pressure to the strain gauge 1-6 through the connecting plate, strain information of the strain gauge 1-6 is reflected in the pressure gauge 1-1, and then grouting pressure is obtained. The connecting plate is arranged to uniformly apply pressure to the strain gauge, and the measured pressure information is more accurate.
In the embodiment, the tail end of the slurry stopping piston 1-4 is provided with a mounting groove for mounting the spring 1-3, the groove diameter of the mounting groove is the same as the outer diameter of the spring 1-3, one end of the spring 1-3 extends into the mounting groove to be connected with the bottom wall of the mounting groove, the other end of the spring 1-3 is connected with the bottom wall of the piston cavity, and when the slurry stopping piston 1-4 moves in the piston cavity, the mounting groove can prevent the spring 1-3 from turning over, so that the slurry stopping piston 1-4 can normally move in the piston cavity.
In this embodiment, the housing 1-8 is provided with a mounting channel for mounting the spring 1-3 and the grout stopping piston 1-4, and the mounting channel is arranged coaxially with the piston cavity. Specifically, the shell 1-8 is provided with a mounting opening, the mounting opening is communicated with the piston cavity, a mounting channel is formed by the space between the mounting opening and the piston cavity, the spring 1-3 and the grout stopping piston 1-4 are mounted in the piston cavity through the mounting channel, and after the mounting is finished, the mounting opening is sealed.
In order to prevent the grout stopping piston 1-4 from moving in the piston cavity and deviating from the axis, a limiting rod is arranged at the free end of the grout stopping piston 1-4, which is in contact with the grout, the limiting rod is arranged at the center of the free end face of the grout stopping piston 1-4 and is perpendicular to the free end face, a limiting plate is arranged at the other end of the limiting rod, the limiting plate is perpendicular to the limiting rod, the shape and the size of the limiting plate are matched with the mounting port, and the limiting plate can move in the mounting channel and is in contact with the side wall of the mounting channel in an attaching mode to. The length of the limiting rod can ensure that the grout stopping piston 1-4 is always positioned in the installation channel in the moving process of the piston cavity, and the limiting rod and the limiting plate can ensure that the grout stopping piston 1-4 moves along the central line of the piston cavity in the piston cavity and can also play a sealing role on an installation opening.
Compared with the prior art, in the grouting anchor cable hole sealing device provided by the embodiment, the grout stopping piston 1-4 arranged in the shell 1-8 can enable the inflow channel 1-5 to be communicated with the outflow channel 1-7 under the grouting pressure, and after grouting is finished, the grout stopping piston 1-4 is reset under the action of the compression spring 1-3 to block the outflow port, so that the inflow channel 1-5 is disconnected from the outflow channel 1-7; and a pressure detection assembly is also arranged in the shell 8 and can reflect grouting pressure by detecting the acting force of the compression springs 1-3. The grouting anchor cable plugging device is simple in structure, can guarantee the unidirectional flow of slurry in the grouting anchor cable grouting process, can automatically plug the grouting opening of the grouting pipe 8, can prevent the problems of uneven grouting or unsatisfactory support after grouting and the like caused by shallow layer slurry leakage, can monitor the change of grouting pressure in real time, improves the grouting effect and the operation efficiency, reduces the grouting cost and guarantees the support effect.
Example two
in another embodiment of the present invention, a grouting anchor cable is disclosed, wherein the grouting anchor cable hole sealing device in the first embodiment is used for sealing a grouting opening of a grouting pipe 8 of the grouting anchor cable, as shown in fig. 3 to 5, the grouting anchor cable comprises a cable body 3 and a grouting anchor cable hole sealing device 1, the cable body 3 is formed by spirally winding a plurality of steel strands 11 around the grouting pipe 8, the spirally wound steel strands 11 wrap the grouting pipe 8, and the pitch of the wound steel strands 11 is greater than the diameter of the steel strands 11; the grouting pipe 8 is provided with a grout outlet 12; the outflow channel 7 of the grouting anchor cable hole sealing device 1 is connected with the grouting opening of the grouting pipe 8.
When the grouting anchor cable is implemented, a cable body 3 of the grouting anchor cable is placed into an anchor cable hole, an external grout stop plug 6 and a tray 5 are sequentially installed, an anchorage device 4 is used for pre-tightening, an outflow channel 1-7 is connected with a grouting opening of a grouting pipe 8, an inflow channel 1-5 is connected with a grouting pump, the grouting pump supplies grout into the inflow channel 1-5, the grout entering a piston cavity from the inflow channel 1-5 exerts pressure on the free end face of a grout stop piston 1-4, the grout stop piston 1-4 moves in the piston cavity under the action of the pressure of the grout and compresses a spring 1-3, and the spring 1-3 stores energy in the compression process and has resilience of restoring the original state; when the grout stopping piston 1-4 partially blocks the first outflow port or does not block the first outflow port, the inflow channel 1-5 is communicated with the outflow channel 1-7 to form a passage allowing the grout to pass through, and the grout in the piston cavity enters the outflow channel 1-7 through the first outflow port and enters the grouting pipe 8. After grouting is completed, the pressure of grout in the piston cavity acting on the free end face of the grout stopping piston 1-4 is reduced, the grout stopping piston 1-4 moves towards the opposite direction of compression of the spring 1-3 under the action of the elastic force of the spring 1-3, the grout stopping piston 1-4 is reset, the first outflow port is completely shielded, and the outflow channel 1-7 is disconnected with the inflow channel. In the grouting process, the size of grouting pressure is monitored through the reading of a pressure gauge 1-1.
Compared with the prior art, the slip casting anchor rope that this embodiment provided, adopt slip casting anchor rope hole sealing device to replace traditional plug to carry out the shutoff to slip casting pipe 8, after the slip casting, slip casting anchor rope hole sealing device 1 can realize stopping carrying out the shutoff to slip casting pipe 8 immediately after the slip casting, can not have the thick liquid to spill, thick liquid leaks outward when can avoiding shutoff slip casting pipe 8, improve the grouting volume in deep stratum fracture, and then improve slip casting reinforcement or shutoff effect, the shutoff process of 8 afterbody slip casting mouths of slip casting pipe need not artificial intervention, and is convenient for operation, effectively prevent that the shallow layer from running the thick liquid, and the work efficiency is improved. Grouting anchor rope hole sealing device 1 can real-time detection grouting pressure through setting up the pressure detection subassembly, carries out complementary evaluation to the slip casting effect according to the slip casting pressure change condition, realizes the level pressure slip casting, improves the operating efficiency and struts the effect, and is significant to the high-efficient work of strutting of underground works such as improvement wellhole worker, tunnel safety.
In a preferred mode of this embodiment, the grouting anchor cable is a multi-section structure, specifically, the grouting pipe 8 is provided with a plurality of passage limiting assemblies, and the plurality of passage limiting assemblies divide the grouting pipe 8 into a plurality of section pipelines; the opening limiting assembly can separate two adjacent segmented pipelines and can be opened under the threshold pressure of the opening limiting assembly to enable the two adjacent segmented pipelines to be communicated, namely, the opening limiting assembly can limit the slurry to flow in the grouting pipe 8 under certain pressure and can be opened under certain hydraulic pressure to enable the two adjacent segmented pipelines to be communicated; the limited through component is provided with a slurry outlet 10 or the segmented pipeline is provided with the slurry outlet 10, and slurry in the pipeline can flow out through the slurry outlet 10 under certain pressure.
During grouting, a grouting pump is utilized to perform grouting in the grouting pipe 8, when grouting pressure in a pipeline is low, the slurry is poor in liquidity, the opening limiting assembly has open threshold pressure, the adjacent two segmented pipelines are in a completely disconnected state, the opening limiting assembly can prevent the slurry from entering the downstream segmented pipeline from the upstream segmented pipeline of the grouting pipe 8, the slurry in the upstream segmented pipeline flows into a space between the cable body 3 and surrounding rocks of the anchor cable hole 13 through the slurry outlet hole 10, the space is filled, and the surrounding rock body hole cracks are filled under the action of the slurry pressure. When the grouting amount of the surrounding rock body hole crack is close to saturation gradually, the pressure in the grouting pipe 8 is increased continuously, the pressure of the grout increases to the threshold pressure of the opening limiting component, the opening limiting component is opened, the upstream subsection pipeline is communicated with the downstream subsection pipeline, the grout in the upstream subsection pipeline enters the downstream subsection pipeline through the opened limiting component, grouting of the next section is carried out, the grouting filling process is repeated until the filling of all the subsection pipelines is completed, the grouting pump is closed, the grouting pipe 8 is sealed, and grouting and anchoring of the coal rock body 7 are completed.
in this embodiment, the cable body 3 includes an outer anchoring section 15, a grouting anchoring section 16, and a resin anchoring section 17, as shown in fig. 4, wherein the grouting anchoring section 16 mainly performs grouting through the grouting pipe 8, and performs grouting operation on the coal rock mass 7 in cooperation with the grout outlet 12 and the grout outlet 10 provided in the grouting pipe 8.
In this embodiment, the grouting anchor cable further includes a locking assembly, as shown in fig. 3, the locking assembly includes a lock 4, a tray 5 and a grout stop plug 6, the grout stop plug 6 is an external grout stop plug, the external grout stop plug is of a circular truncated cone-shaped structure, the external grout stop plug has a first end and a second end, the diameter of the first end is larger than that of the second end, and the grout stop plug 6 is used for blocking the anchor cable hole 13; after the cable body 3 is arranged in the anchor cable hole 13, the locking assembly can be fixed on the coal rock mass 7 in a sealing manner with the cable body 3, specifically, along the orifice of the anchor cable hole 13 to the bottom of the hole direction, the cable body 3 is sequentially provided with a lockset 4, a tray 5 and a grout stop plug 6, the tray 5 is used for extruding the first end of the grout stop plug 6, and the tail part of the grouting pipe 8 is sealed by a grouting anchor cable hole sealing device.
In this embodiment, the opening limiting assembly includes, but is not limited to, the following two structures, the opening limiting assembly of the first structure is an expansion pipe 2, and the plurality of segmented pipelines of the grouting pipe 8 are connected through the expansion pipe 2; as shown in fig. 6, the expansion pipe 2 comprises a slurry inflow connecting section 18, an inner concave section 19 and a slurry outflow connecting section 20 which are connected in sequence, wherein the second flow inlet 9 of the slurry inflow connecting section 18 is connected with an adjacent upstream subsection pipeline, and the second flow outlet 14 of the slurry outflow connecting section 20 is connected with an adjacent downstream subsection pipeline; the concave section 19 is in a closed state in a natural state, and can be opened under a certain hydraulic pressure by disconnecting two adjacent sections of the segmented pipelines so as to communicate the two adjacent sections of the segmented pipelines. The thick liquid flows in the pipe diameter that linkage segment 18 and thick liquid flow out linkage segment 20 equals, and equals with the orificial diameter in interior concave section 19 both ends, and the lateral wall indent of interior concave section 19 is concrete, by the both ends of interior concave section 19 to middle, and the pipe diameter of interior concave section 19 all reduces gradually, and the pipe diameter of interior concave section 19 middle part is minimum, and the lateral wall contact of interior concave section 19 is located to minimum pipe diameter. The positions of the slurry outlet holes 10 are positioned below the minimum pipe diameter position of the concave section 19, and the slurry outlet holes 10 are exemplarily multiple and are uniformly arranged around the axis of the grouting pipe 8/the through limiting assembly. Wherein, along the flowing direction of the slurry in the pipe, the slurry outlet 10 can be arranged on the segmented pipe at the upstream of the concave section 19, or the slurry outlet 10 is arranged on the lower side wall of the concave section 19, preferably, the slurry outlet 10 is arranged on the lower part of the concave section 19. Because concave section 19 has elasticity, locate concave section 19's lower part with grout outlet 10, grout outlet 10 size can be according to slip casting pressure adjustment slip casting volume along with the intraductal pressure change among the grouting process, realizes that the slip casting is controllable, has better slip casting effect. In addition, when the roadway roof is supported, the grouting anchor cable is constructed to be perpendicular to the roof, slurry flowing out of the slurry outlet hole 10 enters and fills the space between the cable body 3 and the surrounding rock of the anchor cable hole, flows to the lower space under the action of gravity, and is difficult to diffuse upwards unless extra large grouting pressure is needed. If the distance between the setting position of the slurry outlet hole 10 and the inner concave section 19 is far, a slurry filling blind area exists between the slurry outlet hole 10 and the inner concave section 19, and slurry cannot diffuse to an upper space, so that the grouting effect is poor. The concave section 19 is made of elastic materials, the concave section 19 has an opening pressure threshold and a closing pressure threshold, and when the pressure in the pipeline reaches the opening pressure threshold, the side wall of the concave section 19 is opened to enable the pipelines of two adjacent sections to be communicated; when the pressure in the pipeline is reduced to a closing pressure threshold value, the side wall of the concave section 19 is closed, and the adjacent two sections of pipelines are disconnected. In a natural state, the minimum pipe diameter of the concave section 19 is smaller than 1/10 of the diameter of the slurry inflow connecting section 18 or the diameter of the slurry outflow connecting section 20, preferably, the side wall of the concave section 19 is concave and contacted, the side wall of the concave section 19 can be opened under certain hydraulic pressure, when the hydraulic pressure of a pipeline is smaller than the opening pressure threshold of the concave section 19, the side wall of the concave section 19 is in a closed state, the slurry can be prevented from entering a downstream subsection pipeline, and the slurry flows out to a space around the cable body 3 and the anchor cable hole 13 through the slurry outflow hole 10; when the hydraulic pressure reaches the opening pressure threshold of the concave section 19, the side wall of the concave section 19 is opened, the side wall is in a communication state, and slurry in the upstream subsection pipeline enters the downstream subsection pipeline through the expansion pipe 2 in the opened state. Illustratively, the inward concave section 19 of the expansion pipe 2 can not deform obviously under the hydraulic pressure of 0-5 Mpa, when the pressure of the slurry is greater than 5Mpa, the inward concave section 19 deforms obviously in the radial direction, the minimum pipe diameter of the inward concave section 19 gradually increases, and the slurry flows into the next section. The expansion pipe 2 of this structure can satisfy and hinder the thick liquid circulation under certain hydraulic pressure, can also prevent the thick liquid backward flow, prevents to drop or the slip casting pump breaks down and leads to accomplishing the thick liquid backward flow of the upper reaches segmentation pipeline of slip casting to spill because of slip casting anchor rope hole sealing device 1.
The second structure is characterized in that the passage limiting component is a baffle plate, a plurality of segmented pipelines of the grouting pipe 8 are separated by the baffle plate, and the baffle plate is connected with the inner wall of the grouting pipe 8 through a damping rotating shaft; the baffle is horizontally arranged in a natural state, and the two adjacent segmented pipelines are disconnected and can be opened under the action of certain hydraulic pressure, so that the two adjacent segmented pipelines are communicated. The shape of baffle, size and slip casting pipe 8 cross section size phase-match, slip casting pipe 8 can the circular pipe also can be the rectangular pipe, and the baffle can separate slip casting pipe 8, prevents the thick liquid circulation. Illustratively, the shape and the size of the baffle are the same as those of the cross section of the grouting pipe 8, one side of the baffle is connected with the inner wall of the grouting pipe 8 through a damping rotating shaft, and the slurry outlet 10 is arranged at the upstream of the damping rotating shaft. When the pressure in the pipeline reaches the threshold pressure of the rotation of the baffle, the baffle is opened from the horizontal state to the downstream direction of the slurry, and when the pressure in the pipeline is smaller than the threshold pressure of the rotation of the baffle, the baffle is kept in the horizontal state, so that the upper and lower adjacent pipelines are separated. Before grouting, the baffle is in a transverse state, and two adjacent sections of pipelines of the grouting pipe 8 are separated. When the pressure of the slurry contacting with the lower surface of the baffle reaches the threshold pressure of upward opening of the baffle, the horizontal baffle can prevent the slurry from entering a downstream subsection pipeline after the slurry is filled in the pipeline, and the slurry flows out to the space around the cable body 3 and the anchor cable hole 13 through the slurry outlet hole 10; when the hydraulic pressure in the downstream subsection pipeline reaches the threshold pressure of upward opening of the baffle, the baffle rotates around the damping rotating shaft and is gradually opened until the baffle is attached to the side wall of the grouting pipe 8 and is in a completely opened state, so that the upper and lower adjacent pipelines are communicated, and the slurry in the upstream subsection pipeline enters the downstream subsection pipeline. Exemplarily, the baffle can not take place to rotate under 0 ~ 5 Mpa's hydraulic pressure, and when thick liquid pressure was greater than 5Mpa, the baffle can rotate around damping pivot, makes the thick liquid circulation get into the pipeline of low reaches. The through limiting component with the structure has the advantages of simple structure and low manufacturing cost.
In this embodiment, the lengths of the plurality of segmented pipes of the grouting pipe 8 may be the same or different. In one preferred mode, the lengths of the segmented pipelines of the grouting pipe 8 are different, preferably, the lengths of the segmented pipelines of the grouting pipe 8 are sequentially shortened along the flowing direction of grout, that is, the grouting anchor cable is installed behind the anchor cable hole and extends from the shallow part of the surrounding rock to the deep part, and the lengths of the segmented pipelines of the grouting pipe 8 are sequentially shortened, the structural design is that the grouting pump mostly adopts constant grouting pressure during grouting or controls the grouting pressure within a certain range, grouting is easy during initial grouting, grout is easy to diffuse rapidly, as the grouting is performed section by section, the grouting difficulty of the deep surrounding rock is increased, the pressure of the grout in the segmented pipelines at the top of the grouting pipe 8 is reduced, the quantity of the grout flowing out from the grout outlet hole 10 in unit time is reduced, the diffusion effect is reduced, the grouting pressure is increased, the lengths of the segmented pipelines are gradually reduced, and the grouting can be more uniform, the grouting amount is increased by 30-45%, and the filling effect of the surrounding rock cracks is better, so that the supporting effect is improved.
The grouting anchor cable with the multi-section structure provided by the embodiment is utilized for supporting, grouting and filling can be sequentially performed on an upstream subsection pipeline and a downstream subsection pipeline under the flow limiting effect of the flow limiting assembly, so that sectional grouting control and multi-section grouting of a coal rock body 7 are realized, uniform diffusion filling of grout in a rock hole crack around an anchor cable hole 13 is guaranteed, the grouting amount is increased by 20% -30%, the grouting effect is remarkably improved, the operation is convenient, and the working efficiency is improved by 30% -40%. The grouting anchor cable realizes gradual grouting operation from the shallow part of the surrounding rock to the deep part by utilizing the sealing function of the through-limiting component under certain pressure, improves the bearing capacity and the supporting effect of the anchor cable, and has obvious control, supporting and maintenance effects on the surrounding rock of the roadway with the mining disturbance in a crack development zone and a top plate crushing zone.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The hole sealing device for the grouting anchor cable is characterized by comprising a shell (1-8), a spring (1-3) and a grout stopping piston (1-4), wherein a piston cavity for mounting the grout stopping piston (1-4) is formed in the shell (1-8), and the grout stopping piston (1-4) is arranged in the piston cavity and can move in the piston cavity under the action of the pressure of grout;
One end of the grout stopping piston (1-4) is fixedly connected with the bottom wall of the piston cavity through a spring (1-3), the other end of the grout stopping piston (1-4) is a free end, and the free end can be contacted with grout in the piston cavity;
The shell (1-8) is provided with an inflow channel (1-5) and an outflow channel (1-7), and the inflow channel (1-5) and the outflow channel (1-7) are respectively communicated with the piston cavity of a first inflow outlet through a first inflow port;
The inflow channel (1-5) and the piston cavity are always in a communicated state, and the outflow channel (1-7) and the piston cavity are in a communicated state and a disconnected state through the movement of the slurry stop piston (1-4) in the piston cavity.
2. The grouting anchor cable sealing device according to claim 1, characterized in that the inflow channel (1-5) and the outflow channel (1-7) are respectively arranged on both sides of the center line of the piston cavity, and the inflow channel (1-5) and the outflow channel (1-7) are arranged in parallel.
3. The grouting anchor cable sealing device according to claim 1 or 2, further comprising a pressure detection assembly, wherein the pressure detection assembly comprises a pressure gauge (1-1) and a strain gauge (1-6), and the pressure gauge (1-1) is connected with the strain gauge (1-6) through a lead (1-2);
The strain gauge (1-6) is embedded into the bottom wall of the piston cavity, and the strain gauge (1-6) is arranged between the spring (1-3) and the bottom wall of the piston cavity.
4. The grouting anchor cable hole sealing device according to claim 3, characterized in that a connecting plate is arranged between the springs (1-3) and the strain gauges (1-6), the connecting plate is fixedly connected with the ends of the springs (1-3), and the connecting plate can cover the strain gauges (1-6).
5. The grouting anchor cable sealing device according to any one of claims 1-2 and 4, wherein the tail end of the grout stopping piston (1-4) is provided with a mounting groove for mounting the spring (1-3).
6. the grouting anchor cable sealing device according to claim 1, characterized in that the housing (1-8) is provided with a mounting channel, the mounting channel is arranged coaxially with the piston cavity, and the spring (1-3) and the grout stopping piston (1-4) are mounted in the piston cavity through the mounting channel.
7. The grouting anchor cable hole sealing device according to any one of claims 1-2, 4 and 6, wherein the free end of the grout stopping piston (1-4) contacting with the grout is provided with a limiting rod, the other end of the limiting rod is provided with a limiting plate, and the limiting plate is perpendicular to the limiting rod;
the limiting plate can move in the installation channel and is in contact with the side wall of the installation channel in a fitting mode.
8. A grouting anchor cable, characterized in that it comprises a cable body (3) and the grouting anchor cable hole sealing device (1) of claims 1 to 7, said cable body (3) being formed by a plurality of steel strands (11) spirally wound around a grouting pipe (8);
and the outflow channel (7) of the grouting anchor cable hole sealing device (1) is connected with the grouting opening of the grouting pipe (8).
9. Grouting anchor cable according to claim 8, characterised in that the grouting pipe (8) is provided with a plurality of passage-limiting assemblies dividing the grouting pipe (8) into a plurality of segmental lines, which are capable of separating two adjacent segmental lines and of opening at a threshold pressure of the passage-limiting assemblies to put the two adjacent segmental lines into communication;
the through limiting component is provided with a slurry outlet (10).
10. Grouting anchor line according to claim 8 or 9, characterised in that the restriction assembly is an expansion pipe (2), the expansion pipe (2) comprising a grout inflow connection section (18), an inner concave section (19) and a grout outflow connection section (20) which are connected in sequence, the second inflow port (9) of the grout inflow connection section (18) being connected to an adjacent upstream segment pipe, and the second outflow port (14) of the grout outflow connection section (20) being connected to an adjacent downstream segment pipe;
The concave section (19) is in a closed state in a natural state, and the adjacent two sections of the segmented pipelines are disconnected and can be opened under certain hydraulic pressure, so that the adjacent two sections of the segmented pipelines are communicated.
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| CN201910954130.1A CN110566254B (en) | 2019-10-09 | 2019-10-09 | Grouting anchor cable hole sealing device and grouting anchor cable |
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| CN201910954130.1A CN110566254B (en) | 2019-10-09 | 2019-10-09 | Grouting anchor cable hole sealing device and grouting anchor cable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682080A (en) * | 2021-01-07 | 2021-04-20 | 安徽理工大学 | Piston type graded grouting anchor cable and grouting method |
| CN113648089A (en) * | 2021-09-16 | 2021-11-16 | 山西医科大学口腔医院 | Handheld automatic fixing nail feeder for oral treatment |
| CN114320409A (en) * | 2021-11-25 | 2022-04-12 | 淮北矿业股份有限公司 | Controllable pressure and let slip casting anchor rope of pressure function |
| CN114893149A (en) * | 2022-06-20 | 2022-08-12 | 中煤科工集团重庆研究院有限公司 | Airborne slip casting machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201739773U (en) * | 2010-04-13 | 2011-02-09 | 肖付典 | Fluid monitoring device |
| CN102644469A (en) * | 2012-05-10 | 2012-08-22 | 中国矿业大学 | Ultra-deep hole pre-grouting pipe for crack-developed surrounding rock and grouting method |
| CN204357464U (en) * | 2014-05-04 | 2015-05-27 | 刘永辉 | A kind of hollow grouting anchor |
| CN105239570A (en) * | 2015-09-30 | 2016-01-13 | 常州大学怀德学院 | Multi-bag type joint-expanded anchor rod and foundation pit supporting construction method |
| CN206845972U (en) * | 2017-05-18 | 2018-01-05 | 长沙执先智量科技股份有限公司 | A kind of hygienic on-off valve |
| CN109681248A (en) * | 2018-12-24 | 2019-04-26 | 中国矿业大学 | A kind of grouting cable anchor advanced support method |
-
2019
- 2019-10-09 CN CN201910954130.1A patent/CN110566254B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201739773U (en) * | 2010-04-13 | 2011-02-09 | 肖付典 | Fluid monitoring device |
| CN102644469A (en) * | 2012-05-10 | 2012-08-22 | 中国矿业大学 | Ultra-deep hole pre-grouting pipe for crack-developed surrounding rock and grouting method |
| CN204357464U (en) * | 2014-05-04 | 2015-05-27 | 刘永辉 | A kind of hollow grouting anchor |
| CN105239570A (en) * | 2015-09-30 | 2016-01-13 | 常州大学怀德学院 | Multi-bag type joint-expanded anchor rod and foundation pit supporting construction method |
| CN206845972U (en) * | 2017-05-18 | 2018-01-05 | 长沙执先智量科技股份有限公司 | A kind of hygienic on-off valve |
| CN109681248A (en) * | 2018-12-24 | 2019-04-26 | 中国矿业大学 | A kind of grouting cable anchor advanced support method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682080A (en) * | 2021-01-07 | 2021-04-20 | 安徽理工大学 | Piston type graded grouting anchor cable and grouting method |
| CN113648089A (en) * | 2021-09-16 | 2021-11-16 | 山西医科大学口腔医院 | Handheld automatic fixing nail feeder for oral treatment |
| CN114320409A (en) * | 2021-11-25 | 2022-04-12 | 淮北矿业股份有限公司 | Controllable pressure and let slip casting anchor rope of pressure function |
| CN114320409B (en) * | 2021-11-25 | 2024-02-06 | 淮北矿业股份有限公司 | Grouting anchor cable with pressure-controllable and pressure-yielding functions |
| CN114893149A (en) * | 2022-06-20 | 2022-08-12 | 中煤科工集团重庆研究院有限公司 | Airborne slip casting machine |
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| CN110566254B (en) | 2020-10-20 |
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