CN110608062A - Multi-section hollow grouting anchor cable and supporting method - Google Patents
Multi-section hollow grouting anchor cable and supporting method Download PDFInfo
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- CN110608062A CN110608062A CN201910954039.XA CN201910954039A CN110608062A CN 110608062 A CN110608062 A CN 110608062A CN 201910954039 A CN201910954039 A CN 201910954039A CN 110608062 A CN110608062 A CN 110608062A
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- grouting
- section
- anchor cable
- pipe
- slurry
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Classifications
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
Abstract
The invention relates to a multi-section hollow grouting anchor cable and a supporting method, belongs to the technical field of roadway supporting, and solves the problems that the existing grouting anchor cable cannot carry out multi-layer sectional grouting reinforcement on deep surrounding rock, and the grouting amount of deep rock stratum cracks is low and the supporting effect is poor due to uneven diffusion of slurry in a drill hole. A multi-section hollow grouting anchor cable comprises a cable body, wherein the cable body is formed by spirally winding a plurality of steel strands on grouting pipes; the slip casting pipe is equipped with a plurality of limits and leads to the subassembly, and a plurality of limits lead to the subassembly and divide into a plurality of segmentation pipelines with the slip casting pipe, and the limit leads to the subassembly and can separate two adjacent segmentation pipelines to can open under the threshold pressure that the subassembly was led to the limit and make two adjacent segmentation pipelines communicate. The deep surrounding rock grouting device is simple in structure, convenient to operate, capable of performing multi-level sectional grouting reinforcement on deep surrounding rock and good in supporting effect.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to the technical field of anchor cable support in mines, tunnels and underground engineering, and particularly relates to a multi-section hollow grouting anchor cable and a support method.
Background
Along with the continuous increase of the coal mining depth, the terrain complexity of the tunnel is continuously changed, which mainly reflects the conditions of serious surrounding rock crushing, stress concentration and the like, in the poor tunnel of the surrounding rock, a large-section chamber, a crossing point, the vicinity of a fault zone and the tunnel influenced by dynamic pressure. The grouting anchor cable can effectively inhibit the generation of joints and cracks inside the surrounding rock, can also prevent the secondary damage of a bonded rock body formed by rock mass inside the surrounding rock and grouting slurry, and injects certain slurry capable of being 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, and playing an important role in the supporting process of loose broken surrounding rock, extremely soft rock stratum, high stress broken surrounding rock and large buried deep coal roadway. The grouting anchor cable is characterized in that an anchor cable body is installed in an anchor hole, high-pressure grouting is conducted in the anchor hole, grout enters a surrounding rock gap through the anchor hole, and broken surrounding rock is cemented into a whole. The grouting anchor cable plays the dual role of grouting and anchor cable anchoring. The hollow grouting anchor cable is a cable body formed by spirally winding a plurality of steel strands on a grouting core pipe, and high-pressure grouting is performed to an anchor hole through the grouting core pipe.
When the existing hollow grouting anchor cable is used for grouting, the grouting plug is used for plugging slurry at an orifice, the slurry flows back from inside to outside after coming out from the front end of the grouting core pipe and is injected into a surrounding rock crack, the process is simple, less slurry is injected into a deep hole or a geological dense section, the slurry is not uniformly spread and permeated, a weak surface exists, and water seepage, water leakage, water bursting, falling pieces, slope sliding and the like are possible to occur. The segmented grouting can achieve the grouting effect with a uniform diffusion range, so that the intelligent multi-segment grouting hollow grouting anchor cable and the application method provided by the invention have important theoretical significance and engineering practice value.
Therefore, it is necessary to develop a multi-section hollow grouting anchor cable and a supporting method, which can improve the grouting amount of deep rock stratum cracks, realize multi-layer automatic section grouting, achieve the grouting effect with uniform diffusion range, and have important significance for improving the safe and efficient supporting of underground engineering such as well engineering, tunnels and the like.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a multi-section hollow grouting anchor cable and a support method, so as to solve the problems that the existing grouting anchor cable cannot perform multi-layer sectional grouting reinforcement on deep surrounding rock, and the grouting amount of deep rock stratum cracks is low and the support effect is poor due to uneven diffusion of slurry in a drill hole.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the multi-section hollow grouting anchor cable comprises a cable body, wherein the cable body is formed by spirally winding a plurality of steel strands on a grouting pipe;
the slip casting pipe is equipped with a plurality of limits and leads to the subassembly, and a plurality of limits lead to the subassembly and divide into a plurality of segmentation pipelines with the slip casting pipe, and the limit leads to the subassembly and can separate two adjacent segmentation pipelines to can open under the threshold pressure that the subassembly was led to the limit and make two adjacent segmentation pipelines communicate.
Furthermore, the opening limiting component 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 first inflow inlet of the slurry inflow connecting section is connected with an adjacent upstream subsection pipeline, and a first connection outflow outlet 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, and the adjacent two sections of segmented pipelines are disconnected and can be opened under certain hydraulic pressure to enable the adjacent two sections of segmented pipelines to be communicated; the through limiting component is provided with a slurry outlet.
Further, the concave section is made of an elastic material; the concave section is provided with an opening pressure threshold value and a closing pressure threshold value, when the pressure in the pipeline reaches the opening pressure threshold value, the side wall of the concave section is opened, and the pipelines of two adjacent subsections are communicated; when the pressure in the pipeline is reduced to a closing pressure threshold value, the side wall of the concave section is closed, and the adjacent two sections of pipelines are disconnected.
Furthermore, the diameter of the slurry inflow connecting section is equal to that of the slurry outflow connecting section, and is equal to that of pipe orifices at two ends of the concave section; from the both ends of the lateral wall of interior concave section to the centre, the pipe diameter of interior concave section all reduces gradually, and the lateral wall contact of the concave section is put in to minimum pipe diameter department.
Furthermore, the grout outlet is arranged on the side wall of the lower part of the concave section.
Furthermore, the opening limiting component is a baffle plate, and the baffle plate is connected with the inner wall of the grouting pipe through a damping rotating shaft; the baffle is horizontally arranged in a natural state, and can be opened under the action of certain hydraulic pressure to connect two adjacent segmented pipelines; the side wall of the segmented pipeline at the upstream of the baffle is provided with a slurry outlet.
Further, the number of the slurry outlet holes is multiple.
Further, the pitch of the helically wound steel strand is greater than the diameter of the steel strand.
Furthermore, the multi-section hollow grouting anchor cable also comprises a grouting anchor cable hole sealing component and a locking component, wherein the grouting anchor cable hole sealing component is used for sealing and plugging a grout inlet at the tail part of the grouting pipe; the locking assembly is used for fixing the cable body on the coal rock mass; the locking assembly comprises a lockset, a tray and a grout stopping plug, and the grout stopping plug is used for plugging the anchor cable hole.
On the other hand, a supporting method based on the multi-section hollow grouting anchor cable is further provided, and the supporting method comprises the following steps:
the first step is as follows: determining grouting parameters and performing early preparation;
the second step is that: mounting a grouting anchor cable;
the third step: and grouting section by section to complete grouting support.
Compared with the prior art, the invention has at least one of the following beneficial effects:
a) according to the multi-section hollow grouting anchor cable provided by the invention, the plurality of the passage limiting assemblies are arranged on the grouting pipe, the grouting pipe is divided into the plurality of segmented pipelines by the plurality of the passage limiting assemblies, each segment of the pipeline is provided with the slurry outlet, and under the flow limiting effect of the passage limiting assemblies, the upstream segmented pipelines are used for sequentially grouting and filling the downstream segmented pipelines, so that segmented grouting control and multi-segmented grouting of a coal rock body are realized, uniform diffusion and filling of slurry in cracks of rock holes around the anchor cable hole are ensured, and the grouting effect is obviously improved.
b) According to the multi-section hollow grouting anchor cable provided by the invention, the plurality of passage limiting assemblies are arranged on the grouting pipe, the function of closing the passage limiting assemblies under certain pressure is utilized, and under the flow limiting effect of the passage limiting assemblies, the upstream subsection pipelines are sequentially filled with grouting towards the downstream subsection pipelines, so that sectional grouting regulation and control are realized, multi-section grouting on a coal rock body is realized, grouting operation is gradually carried out from a shallow part of a surrounding rock to a deep part, the bearing capacity and the supporting effect of the anchor cable are improved, and the surrounding rock control, supporting and maintaining effects of a roadway with a fracture development zone and a top plate crushing zone disturbed by recovery are obvious.
c) The support method provided by the invention can determine a sectional grouting scheme according to specific geological conditions and production conditions, has a sealing function under a certain pressure according to the pressure change in the grouting pipe and the opening limiting component, adopts a multi-layer grouting means to naturally form a plurality of grouting sections, enables grout to uniformly diffuse into surrounding rock cracks, increases the grouting amount by 20-30%, ensures the surrounding rock grouting effect, is convenient to operate, and improves the working efficiency by 30-40%.
d) According to the support method provided by the invention, the lengths of the plurality of segmented pipelines of the grouting pipe are set to be in gradient decreasing arrangement, the grouting anchor cable is arranged behind the anchor cable hole, and the lengths of the segmented pipelines of the grouting pipe are sequentially shortened from the shallow part of the surrounding rock to the deep part, so that grouting is more uniform, the filling effect of cracks of the surrounding rock is better, and the grouting amount is increased by 30% -45%, thereby improving the support effect.
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 diagram of a rock mass supported by a multi-section hollow grouting anchor cable in the embodiment of the invention;
fig. 2 is a schematic structural view of a multi-section hollow grouting anchor cable in the embodiment of the invention;
FIG. 3 is a schematic sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural view of an expansion tube in an embodiment of the invention;
FIG. 5 is a schematic structural diagram of the grouting anchor cable hole sealing device in the embodiment of the present invention when grouting is not performed;
fig. 6 is a schematic structural diagram of the grouting anchor cable hole sealing device in the embodiment of the invention during grouting.
Reference numerals:
1-grouting anchor cable hole sealing components; 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 first inflow; 10-slurry outlet; 11-steel strand; 12-a pulp outlet; 13-anchor cable holes; 14-a first 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 multi-section hollow grouting anchor cable, as shown in fig. 1 and fig. 3, the anchor cable comprises a cable body 3, wherein the cable body 3 is formed by spirally winding a plurality of steel strands 11 on a grouting pipe 8, the grouting pipe 8 is wound by the spirally wound steel strands 11, and the thread pitch of the wound steel strands 11 is larger than the diameter of the steel strands 11; the grouting pipe 8 is provided with a plurality of passage limiting components, and the plurality of passage limiting components divide the grouting pipe 8 into a plurality of segmented 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 slurry outlet hole 10 is arranged on the through limiting component or the slurry outlet hole 10 is arranged on the segmented pipeline, and slurry in the pipeline can flow out through the slurry outlet hole 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.
Compared with the prior art, the multistage formula cavity slip casting anchor rope that this embodiment provided, through set up a plurality of limits on slip casting pipe 8 and lead to the subassembly, a plurality of limits lead to the subassembly and divide into a plurality of segmentation pipelines with slip casting pipe 8, limit and lead to and set up grout outlet 10 on the subassembly or set up grout outlet 10 on the segmentation pipeline, under the current limiting effect of subassembly is led to the limit, by the upstream segmentation pipeline towards the downstream segmentation pipeline slip casting filling in proper order, realize sectional type slip casting regulation and control, 7 multistage slip castings to the coal petrography body, guaranteed that the thick liquid evenly spreads in anchor rope hole 13 country rock hole crack and fills, the grouting volume increases 2% ~ 30%, is showing and has promoted the slip casting effect. The function of sealing the limited-opening assembly under certain pressure is utilized, grouting operation from the shallow part of the surrounding rock to the deep part is gradually carried out, the bearing capacity and the supporting effect of the anchor cable are improved, and the control, supporting and maintaining effects of the surrounding rock of the roadway are obvious when stoping disturbance is applied to a fracture development zone and a top plate fracture zone.
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. 2, 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 multi-section hollow grouting anchor cable further comprises a plug and a locking assembly, wherein the plug is used for plugging a grout inlet at the tail part of the grouting pipe 8. As shown in fig. 1, 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 in 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 plugging 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 hole opening of the anchor cable hole 13 to the hole bottom direction, the cable body 3 is sequentially provided with a lock 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 grouting port at the tail part of the grouting pipe 8 is sealed through a plug.
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. 4, 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 first inflow port 9 of the slurry inflow connecting section 18 is connected with an adjacent upstream subsection pipeline, and the first outflow port 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 or 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 perpendicular to the roof for construction, 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. 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 flowing into the connecting section 18 or the diameter of the slurry flowing out of the 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 the 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 outlet 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 because of the plug or the grouting pump breaks down and leads to the thick liquid backward flow of the upper reaches segmentation pipeline of having accomplished the slip casting to spill.
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.
Example two
In the multi-section hollow grouting anchor cable of the embodiment, the grouting anchor cable hole sealing component 1 is used for replacing a plug in the first embodiment to seal a grouting opening of a grouting pipe 8, as shown in fig. 5 to 6, the grouting anchor cable hole sealing component 1 comprises a shell 1-8, a spring 1-3 and a grout stopping piston 1-4, a piston cavity for installing 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; 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 second outflow piston cavity through a second 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 second inflow port cannot be shielded by the grout stopping piston 1-4; through the movement of the slurry stop 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 stop piston 1-4 and the second outflow port have three position relations, namely the slurry stop piston 1-4 completely shields the second outflow port, the slurry stop piston 1-4 partially shields the second outflow port, and the slurry stop piston 1-4 does not shield the second 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 grout stopping pistons 1-4 do not shield the second inflow port, but completely shield the second outflow port, so that the outflow channels 1-7 are disconnected from the piston cavity, and 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 second outlet or does not block the second outlet, the inflow channel 1-5 is communicated with the outflow channel 1-7 to form a passage allowing grout to pass through, and the grout in the piston cavity enters the outflow channel 1-7 through the second outlet 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 second flow outlet 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 assembly 1 further comprises a pressure detection assembly, as shown in fig. 5 to 6, 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. 5 shows a schematic structural diagram of the grouting anchor cable hole sealing assembly 1 before grouting, wherein a spring 1-3 is connected with a grout stopping piston 1-4, the grout stopping piston 1-4 is tightly attached to a shell 1-8, the spring 1-3 is in a natural state without being acted by force, and the grout stopping piston 1-4 and the shell 1-8 divide an inflow channel 1-5 and an outflow channel 1-7 to block the outflow of grout; 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. 6 shows a schematic structural diagram of the grouting anchor cable hole sealing assembly 1 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, so that the inflow channel 1-5 is communicated with an outflow channel 1-7, the grout flows in 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 7 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, the multi-section hollow grouting anchor cable provided by the embodiment adopts the grouting anchor cable hole sealing component 1 capable of automatically sealing holes to replace a screwed plugging grouting pipe 8, 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 grouting pressure, and the grout stopping piston 1-4 resets under the action of the compression spring 1-3 after grouting is completed to plug the second 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 is simple in structure, unidirectional flow of slurry can be guaranteed in the grouting process of the grouting anchor cable, the grouting opening of the grouting pipe 8 can be automatically plugged, the problems of uneven grouting or unsatisfactory support after grouting and the like caused by shallow layer slurry leakage can be solved, the change of grouting pressure can be monitored in real time, the grouting effect is improved, the working efficiency is improved by 30% -40%, the grouting cost is reduced, and the support effect is guaranteed.
EXAMPLE III
The embodiment provides a supporting method, which is used for supporting by using the multi-section hollow grouting anchor cable in the first embodiment and the second embodiment, and comprises the following steps:
the first step is as follows: and determining grouting parameters and performing early preparation. And determining grouting parameters of the grouting anchor cable according to the geological profile and production conditions, wherein the grouting parameters comprise the number of segmented pipelines of the grouting pipe 8, the pipe diameter, the diameter and the number of steel strands, the aperture and the depth of the anchor cable hole 13, grouting pressure and the like. Determining the number of grouting sections according to actual conditions, wherein the grouting pipes 8 are n sections, and the expansion pipes 2 are n-1 sections; and arranging a grouting pump in the designed roadway, and drilling anchor cable holes 13 in the roadway coal rock mass 7 in advance according to the design.
The second step is that: and (6) installing a grouting anchor cable. And putting a resin explosive roll into the anchor cable hole 13 according to the design requirement, filling the hollow grouting anchor cable 3, pushing the hollow grouting anchor cable 3 to extrude the resin explosive to be rolled into the hole bottom, and stirring for 30s to ensure that the hollow grouting anchor cable 3 goes deep into the hole bottom of the anchor cable hole 13. And a grout stop plug 6 and a tray 5 are sequentially installed from the outer end of the hollow grouting anchor cable 3, the tray 5 extrudes the grout stop plug 6, a loading device is utilized to apply pre-tightening force to the tray 5, and the hollow grouting anchor cable 3 is locked by a lock 4.
The third step: and grouting section by section to complete grouting support. The grouting pump is connected with the grouting pipe 8, the grouting pump is started to perform grouting in the grouting pipe 8, when grouting pressure in a pipeline is low, the slurry is poor in liquidity, due to the fact that threshold pressure of opening exists in the opening limiting component, the adjacent two sections of pipelines are in a completely disconnected state, the opening limiting component can prevent the slurry from entering the downstream subsection pipeline from the upstream subsection pipeline of the grouting pipe 8, the slurry in the upstream pipeline flows into the space between the cable body 3 and the surrounding rock of the anchor cable hole 13 through the slurry outlet hole 10, the space is filled, the surrounding rock hole cracks are filled under the action of slurry pressure, after the slurry of the surrounding cracks, joints and gaps around the anchor cable hole 13 is condensed, the broken surrounding rock is reinforced, and the integrity of the broken surrounding rock structure can be remarkably improved. When the grouting amount of the hole crack of the surrounding rock body is gradually close to saturation, the pressure in the grouting pipe 8 is continuously increased, the pressure of the grout is increased 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 opening 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, and the grouting pipe 8 is sealed.
In the third step, if the grouting anchor cable hole sealing component 1 in the second embodiment is adopted during grouting, a grouting opening of a grouting pipe 8 of a grouting pipe 7 of the grouting anchor cable hole sealing component 1 is connected, an inflow pipe 5 of the grouting anchor cable hole sealing component 1 is connected with a grouting pump, after grouting is completed, the grouting pump is closed, and then the connection between the grouting pump and the grouting anchor cable hole sealing component 1 is directly disconnected, and the grouting anchor cable hole sealing component 1 has an automatic hole sealing function, so that the grouting pipe 8 is not required to be manually sealed; if the plug in the first embodiment is adopted during grouting, the grouting pump is directly connected with the grouting pipe 8, the grouting pump is closed after grouting is completed, grouting is stopped, the grout is initially set, a stop ball valve on the grouting pump is opened, then a grouting pipeline at the tail part of the anchor rope is dismounted, the plug at the tail part of the anchor rope is screwed up firmly, and grouting, anchoring and supporting of the surrounding rock of the roadway are completed.
In the embodiment, in the first step, the lengths of the plurality of segmented pipelines of the grouting pipe 8 are set to be in gradient decreasing arrangement, specifically, the lengths of the plurality of segmented pipelines of the grouting pipe 8 are sequentially shortened along the flowing direction of the grout, that is, the grouting anchor cable is installed behind the anchor cable hole, and the lengths of the segmented pipelines of the grouting pipe 8 are sequentially shortened from the shallow part of the surrounding rock to the deep part, the structural design is that the grouting pump mostly adopts constant grouting pressure during grouting, or the grouting pressure is controlled within a certain range, during initial grouting, grouting is easy, grout is easy to diffuse rapidly, as the grouting is performed segment by segment, 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 amount of the grout flowing out from the grout outlet 10 in unit time is reduced, the diffusion effect is deteriorated, the grouting pressure is increased, and the lengths of the segmented pipelines are set to be in gradient decreasing arrangement, the grouting is more uniform, and the filling effect of the surrounding rock cracks is better, so that the supporting effect is improved.
In this embodiment, the grouting pipe 8 includes two structures, the two structures adopt different-structure passage-limiting assemblies, including but not limited to the following two structures, the passage-limiting assembly of the first structure is an expansion pipe 2, and a plurality of segmental pipelines of the grouting pipe 8 are connected through the expansion pipe 2; as shown in fig. 4, 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 first inflow port 9 of the slurry inflow connecting section 18 is connected with an adjacent upstream subsection pipeline, and the first outflow port 14 of the slurry outflow connecting section 20 is connected with an adjacent downstream subsection pipeline; the pipe diameter that thick liquid flows in the linkage segment 18 and flows out linkage segment 20 with thick liquid is the same, and the lateral wall indent of interior concave section 19 is specific, and to the centre by the both ends of interior concave section 19, the pipe diameter of interior concave section 19 all reduces gradually, and the pipe diameter at interior concave section 19 middle part is minimum. 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 at the lower part of the concave section 19, preferably, the slurry outlet 10 is arranged at 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 flowing into the connecting section 18 or the diameter of the slurry flowing out of the 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 the 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 outlet 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 subassembly 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.
Compared with the prior art, the supporting method provided by the embodiment utilizes the sectional type hollow grouting anchor cable in the first embodiment to perform sectional grouting, and specifically, during grouting, as the plurality of passage limiting assemblies are arranged on the grouting pipe 8, the plurality of passage limiting assemblies divide the grouting pipe 8 into the plurality of sectional pipelines, each passage limiting assembly is provided with the grout outlet 10, and under the flow limiting effect of the passage limiting assemblies, the upstream sectional pipelines sequentially perform grouting filling on the downstream sectional pipelines, so that sectional type grouting control and coal rock mass 7 multistage grouting are realized, uniform diffusion filling of grout in the cracks of the surrounding rock holes of the anchor cable holes 13 is ensured, and the grouting effect is remarkably improved. The function of sealing the limited-opening assembly under certain pressure is utilized, grouting operation from the shallow part of the surrounding rock to the deep part is gradually carried out, the bearing capacity and the supporting effect of the anchor cable are improved, and the control, supporting and maintaining effects of the surrounding rock of the roadway are obvious when stoping disturbance is applied to a fracture development zone and a top plate fracture zone. In addition, the length of a plurality of subsection pipelines of the grouting pipe 8 is set to be gradient decreasing, the grouting anchor cable is installed behind an anchor cable hole, the grouting anchor cable is arranged from a shallow part of surrounding rock to a deep part, the length of the subsection pipelines of the grouting pipe 8 is sequentially shortened, the structural design is that during initial grouting, grouting is easy, grouting pressure is increased gradually along with the gradual grouting, the length of the subsection pipelines is decreased gradually, grouting can be more uniform, the grouting amount is increased by 30% -45%, the filling effect of surrounding rock cracks is better, and therefore the supporting effect is improved.
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 multi-section hollow grouting anchor cable is characterized by comprising a cable body (3), wherein the cable body (3) is formed by spirally winding a plurality of steel strands (11) on grouting pipes (8);
slip casting pipe (8) are equipped with a plurality of limits and lead to the subassembly, and a plurality of limits lead to the subassembly and divide into a plurality of segmentation pipelines with slip casting pipe (8), and the limit leads to the subassembly and can separate adjacent two segmentation pipelines to can open under the threshold pressure that the subassembly was led to the limit makes adjacent two segmentation pipelines communicate.
2. The multi-section hollow grouting anchor rope according to claim 1, wherein the through-restriction component is an expansion pipe (2), 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, the first inflow port (9) of the slurry inflow connecting section (18) is connected with an adjacent upstream section pipeline, and the first outflow port (14) of the slurry outflow connecting section (20) is connected with an adjacent downstream section pipeline;
the concave section (19) is in a closed state in a natural state, and the adjacent two sections of segmented pipelines are disconnected and can be opened under certain hydraulic pressure to enable the adjacent two sections of segmented pipelines to be communicated;
and the through limiting component is provided with a slurry outlet (10).
3. The multi-segment hollow grout anchor cable of claim 2 wherein said female segment (19) is made of an elastomeric material;
the concave section (19) is provided with an opening pressure threshold value and a closing pressure threshold value, when the pressure in the pipeline reaches the opening pressure threshold value, the side wall of the concave section (19) is opened, and the pipelines of two adjacent sections are 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 two adjacent sections of pipelines are disconnected.
4. The multi-section hollow grouting anchor rope according to claim 3, wherein the grout inflow connecting section (18) and the grout outflow connecting section (20) have the same pipe diameter and the same diameter as the pipe openings at the two ends of the concave section (19);
from two ends of the side wall of the concave section (19) to the middle, the pipe diameters of the concave sections (19) are gradually reduced, and the side wall of the concave section (19) at the position of the minimum pipe diameter is contacted.
5. The multi-section hollow grouting anchor rope according to any one of claims 2 to 4, characterized in that the grout outlet (10) is provided at the lower side wall of the inner concave section (19).
6. The multi-section hollow grouting anchor cable according to claim 1, wherein the passage limiting component is a 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 can be opened under the action of certain hydraulic pressure to connect two adjacent segmented pipelines;
and a slurry outlet (10) is formed in the side wall of the segmented pipeline at the upstream of the baffle.
7. The multi-section hollow grouting anchor cable according to claim 6, wherein the number of the grout outlet holes (10) is multiple.
8. The multi-section hollow grouting anchor cable according to claim 1, characterized in that the pitch of the helically wound steel strands (11) is greater than the diameter of the steel strands (11).
9. The multi-section hollow grouting anchor cable according to claim 1, further comprising a grouting anchor cable hole sealing assembly 1 and a locking assembly, wherein the grouting anchor cable hole sealing assembly 1 is used for sealing a grouting inlet at the tail part of the grouting pipe (8);
the locking assembly is used for fixing the cable body (3) on the coal rock body (7); the locking assembly comprises a lockset (4), a tray (5) and a grout stopping plug (6), wherein the grout stopping plug (6) is used for plugging the anchor cable hole (13).
10. A method for supporting a multi-section hollow grouting anchor cable according to claims 1 to 9, comprising the following steps:
the first step is as follows: determining grouting parameters and performing early preparation;
the second step is that: mounting a grouting anchor cable;
the third step: and grouting section by section to complete grouting support.
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| CN111271105A (en) * | 2020-04-01 | 2020-06-12 | 山东科技大学 | Geotechnical engineering sectional type hollow grouting anchor cable and grouting method |
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| CN114294034A (en) * | 2021-12-29 | 2022-04-08 | 国家能源集团宁夏煤业有限责任公司 | Roadway support system and roadway support method |
| CN114352330A (en) * | 2022-03-18 | 2022-04-15 | 应急管理部国家自然灾害防治研究院 | A slip casting strut anchor rope equipment for preventing earthquake is strikeed to tunnel |
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