CN112049670A - Detachable grouting sleeve applied to roadway surrounding rock support - Google Patents

Abstract

The invention discloses a detachable grouting sleeve applied to roadway surrounding rock support, which comprises a first end sleeve, a splicing sleeve, a tail sleeve and a second end sleeve, wherein grouting channels communicated with the tail sleeve are respectively arranged on the first end sleeve, the splicing sleeve and the second end sleeve, a grouting port is arranged on the tail sleeve and communicated with the grouting channels, the first end sleeve, the splicing sleeve and the tail sleeve are sequentially connected to form a primary grouting sleeve, the second end sleeve and the tail sleeve are connected to form a secondary grouting sleeve, a first connecting part used for connecting a second baffle in a main body support structure is arranged on the first end sleeve, and a second connecting part used for connecting a third baffle in the main body support structure is arranged on the second end sleeve. The primary grouting sleeve and the secondary grouting sleeve which are different in length are formed by splicing different parts, so that an application foundation can be provided for applying multiple pretightening forces and strengthening the supporting effect on surrounding rocks of roadways at different depths.

Description

Detachable grouting sleeve applied to roadway surrounding rock support

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of roadway surrounding rock reinforcement, in particular to a detachable grouting sleeve applied to roadway surrounding rock support.

[ background of the invention ]

In the coal mining process, due to the complexity and the variability of surrounding rock conditions, support structures such as anchor rods and anchor cables play an important role in the aspect of roadway surrounding rock support, and the resource mining and the safety of machinery and personnel are guaranteed. According to investigation, the most main support mode in the deep roadway surrounding rock control at home and abroad is the mode of supporting by matching an anchor rod and an anchor cable with sprayed concrete. The prestressed anchor rod can provide strong supporting force for a shallow broken rock body, so that the stability of the roadway structure is maintained; the prestressed anchor cable has good advantages in the aspects of structural length and supporting strength, and has a large anchoring range. Both of the two methods use active support as a support concept, can give full play to the self-bearing capacity of the surrounding rock, can effectively control the violent deformation of the rock mass to a certain extent, and provide a safe environment for coal mining. Compared with the passive support mode, the prestressed anchor rod (cable) support is obviously superior to the passive support mode in material cost, operation simplicity and support effect.

However, as the resource exploitation shifts to the deep part, the tunnel burial depth is larger and larger, the surrounding rock stress is increased continuously, and the supporting effect of the common anchor rod (cable) supporting technology is more and less obvious, and even the common anchor rod (cable) supporting technology is ineffective. In the existing deep tunnel anchor rod (cable) supporting technology, a local anchoring and local grouting mode is usually adopted, only once or no pretightening force is applied, the rock masses at different depths are difficult to support differentially, the difference of tunnel surrounding rock mechanical structures in a deep high-stress state is ignored, and the supporting effect is poor.

[ summary of the invention ]

The invention aims to provide a detachable grouting sleeve applied to roadway surrounding rock supporting, wherein the primary grouting sleeve and the secondary grouting sleeve with different lengths are formed by splicing different parts, so that an application foundation can be provided for applying multiple pretightening forces on roadway surrounding rocks with different depths and enhancing a supporting effect.

The technical scheme provided by the invention is as follows:

be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted, including first tip sleeve pipe, concatenation sleeve pipe, afterbody sleeve pipe and second tip sleeve pipe, all be equipped with the slip casting passageway that link up with the afterbody sleeve pipe on first tip sleeve pipe, concatenation sleeve pipe and the second tip sleeve pipe, be equipped with the slip casting mouth on the afterbody sleeve pipe, the slip casting mouth with slip casting passageway intercommunication, first tip sleeve pipe, concatenation sleeve pipe and afterbody sleeve pipe connect gradually and form one-level slip casting sleeve pipe, second tip sleeve pipe and afterbody bushing connection form second grade slip casting sleeve pipe, be equipped with the first connecting portion that are arranged in connecting main part supporting construction second baffle on the first tip sleeve pipe, be equipped with the second connecting portion that are arranged in connecting main part supporting construction third baffle on the second tip sleeve pipe.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, all be equipped with the seepage flow passageway that link up with the afterbody sleeve pipe on first end sleeve pipe, concatenation sleeve pipe and the second end sleeve pipe, be equipped with the piston assembly who is used for the feedback slip casting condition in the seepage flow passageway.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, the one end that is equipped with first connecting portion on the first end sleeve pipe is equipped with to the bellied first spacing boss of seepage flow channel inflow direction, be equipped with the first spacing separation blade relative with first spacing boss in the sheathed tube seepage flow channel of first end, be equipped with the first boss through-hole with seepage flow channel intercommunication on the first spacing boss.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, the one end that is equipped with the second connecting portion on the second end sleeve pipe is equipped with to the bellied second of seepage flow channel inflow direction is spacing boss, be equipped with the spacing separation blade of second in the sheathed tube seepage flow channel of afterbody, be equipped with the second boss through-hole with seepage flow channel intercommunication on the spacing boss of second.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, piston assembly includes piston head and piston rod, the piston head is located the one end of piston rod and the diameter of piston head is greater than the diameter of piston rod.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, piston rod among the one-level slip casting sleeve pipe is including dismantling concatenation piston rod and the stock of connection, piston rod among the second grade slip casting sleeve pipe is the stock.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, slip casting passageway and slip casting mouth quantity are four, four the slip casting passageway is along pipe wall circumference evenly distributed, the slip casting direction of slip casting mouth is perpendicular with the axial of slip casting passageway.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, first connecting portion are including locating the first buckle of first end sleeve pipe surface.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted as above, second connecting portion are including locating second buckle and the limit baffle of second end portion sleeve pipe surface.

Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted, the one end of keeping away from first connecting portion on the first tip sleeve pipe is equipped with first connector link, the one end of keeping away from the second connecting portion on the second tip sleeve pipe is equipped with the second connector link, concatenation sleeve pipe one end is equipped with the third connector link, and the other end is equipped with the first connecting hole that is used for being connected with first connector link, be equipped with the second connecting hole of being connected with second connector link or third connector link on the afterbody sleeve pipe.

Compared with the prior art, the invention has the following advantages:

1. the detachable grouting sleeve applied to roadway surrounding rock supporting is characterized in that a first end sleeve, a splicing sleeve and a tail sleeve are sequentially connected to form a first-stage grouting sleeve, a deeper rock body is grouted and anchored, a second-stage grouting sleeve is formed by connecting a second end sleeve and the tail sleeve, and a shallow rock body is grouted and anchored. The primary grouting sleeve and the secondary grouting sleeve with different lengths are formed by splicing different parts, so that an application foundation can be provided for applying multiple pretightening forces and strengthening the supporting effect on surrounding rocks of roadways with different depths; meanwhile, the parts are simple in structure, low in production and use cost, different parts can be detachably spliced and reused, and the application range is wide.

2. According to the detachable grouting sleeve applied to roadway surrounding rock support, the first end sleeve, the splicing sleeve and the second end sleeve are respectively provided with the seepage channel communicated with the tail sleeve, the piston assembly used for feeding back the grouting condition is arranged in the seepage channel, when the slurry is filled, the slurry enters the seepage channel and pushes the piston assembly to move, an operator can conveniently and accurately learn the filling time of the slurry through the moving state of the piston assembly, and the construction efficiency is improved.

[ description of the drawings ]

Fig. 1 is a schematic structural view of a foundation support structure according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a foundation support structure combined with a primary grouting casing according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of a foundation support structure combined with a secondary grouting sleeve according to an embodiment of the invention.

Fig. 4 is a schematic structural view of a main body supporting structure according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of a bolt and cable bolt anchor fixing assembly according to an embodiment of the present invention.

Fig. 6 is a perspective view of a main body supporting structure according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a first baffle according to an embodiment of the invention.

Fig. 8 is a schematic structural diagram of a third baffle according to an embodiment of the invention.

Fig. 9 is a first schematic structural diagram of a second baffle according to an embodiment of the present invention.

Fig. 10 is a second schematic structural diagram of a second baffle according to an embodiment of the present invention.

Fig. 11 is a cross-sectional view of a primary grouting bushing in accordance with an embodiment of the invention.

Fig. 12 is an exploded view of a primary grouting casing according to an embodiment of the invention.

Fig. 13 is an exploded view of a primary grouting casing according to an embodiment of the invention.

Fig. 14 is a cross-sectional view of a two-stage grouting bushing according to an embodiment of the invention.

Fig. 15 is an exploded view of a second casing according to an embodiment of the present invention.

Fig. 16 is an exploded view of a second stage grouting bushing according to an embodiment of the invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.

Referring to fig. 1 to 16, the embodiment provides a surrounding rock supporting structure of a roadway capable of applying pre-tightening force in a graded manner. The roadway surrounding rock supporting structure capable of applying pretightening force in a grading mode comprises a main body supporting structure applied to roadway surrounding rock supporting and a detachable grouting sleeve applied to roadway surrounding rock supporting. According to the roadway surrounding rock supporting structure capable of applying pretightening force in a grading manner, the adaptive supporting structure is adopted for surrounding rocks in different sections on the main supporting structure, and grouting sleeves with different lengths are used for grouting and anchoring rock masses in different depths, so that differentiated supporting of spatially differentiated rock masses is realized, and a better supporting effect is obtained.

The main body supporting structure applied to roadway surrounding rock supporting comprises a main body supporting structure 1, wherein the main body supporting structure 1 comprises a plurality of anchor cables 14 arranged side by side, a first baffle 11, a second baffle 12 and a third baffle 13 which are used for dividing surrounding rocks passed by the anchor cables 14 into four sections are sequentially arranged on the plurality of anchor cables 14, and the four sections comprise a first section, a second section, a third section and a fourth section which are used for applying pre-tightening force in a grading manner and are sequentially arranged; a stirring anchoring head 15 which is fixedly connected with the head end of the anchor cable 14 and is used for stirring the anchoring agent and anchoring the head end of the anchor cable 14 is arranged in the first section; a plurality of reinforcing sections 16 which are connected with the second baffle 12 and the third baffle 13 and are arranged side by side with the anchor cables 14 are arranged in the third section; an anchor rod 17 and an anchor cable anchor rod fixing assembly 18 are arranged in the fourth section, the anchor rod 17 is arranged among the anchor cables 14, and the anchor cable anchor rod fixing assembly 18 is arranged at the tail end of the anchor cable 14; the anchor cable is provided with a first baffle plate 11, a second baffle plate 12 and a third baffle plate 13, surrounding rocks passed by the anchor cable 14 are divided into a first section, a second section, a third section and a fourth section which are sequentially arranged and can apply pre-tightening force in a grading manner, and a stirring anchoring head 15 supporting structure is adopted in the first section for anchoring and supporting so as to be suitable for anchoring and supporting of a deep complete rock body; in the second section, anchor ropes 14 are adopted for supporting so as to be suitable for anchoring and supporting of a relatively complete rock body; in the third section, a supporting structure formed by combining the anchor cable 14 and the reinforcing section 16 is adopted for supporting so as to be suitable for anchoring and supporting of a broken rock body, and in the fourth section, a supporting structure formed by combining the anchor cable 14 and the anchor rod 17 is adopted for supporting so as to be suitable for anchoring and supporting of a shallow broken rock body; adopt different supporting construction to different district section through main part supporting construction 1 to the realization is strutted to the differentiation of space difference rock mass, more can adapt to the anchor of multi-level rock mass, and the reliability is high, and simple structure, and it is convenient to install, struts effectually.

The detachable grouting sleeve applied to the roadway surrounding rock support comprises a first end sleeve 21, a splicing sleeve 22, a tail sleeve 23 and a second end sleeve 31, the first end sleeve 21, the splicing sleeve 22 and the second end sleeve 31 are all provided with a grouting channel 24 communicated with the tail sleeve 23, the tail sleeve 23 is provided with a grouting opening 231, the grouting opening 231 is communicated with the grouting channel 24, the first end casing 21, the splicing casing 22 and the tail casing 23 are sequentially connected to form the first-stage grouting casing 2, the second end casing 31 and the tail casing 23 are joined to form the secondary grouting casing 3, the first end sleeve 21 is provided with a first connection 211 for connecting a second apron 12 of the main body supporting structure, and a second connecting part 311 for connecting the third baffle 13 in the main body supporting structure is arranged on the second end sleeve 31. The first-stage grouting sleeve 2 and the second baffle 12 are detachably connected and used for grouting the second section, and the second-stage grouting sleeve 3 and the third baffle 13 are detachably connected and used for grouting the third section. The first end casing 21, the splicing casing 22 and the tail casing 23 are sequentially connected to form a first-stage grouting casing 2, the rock body at the deeper part is subjected to grouting anchoring, the second end casing 31 and the tail casing 23 are connected to form a second-stage grouting casing 3, and the shallow rock body is subjected to grouting anchoring. The primary grouting sleeve 2 and the secondary grouting sleeve 3 with different lengths are formed by splicing different parts, so that an application foundation can be provided for applying multiple pretightening forces and strengthening the supporting effect on surrounding rocks of roadways with different depths; (ii) a Meanwhile, the parts are simple in structure, low in production and use cost, different parts can be detachably spliced and reused, and the application range is wide.

Furthermore, the first end sleeve 21, the splice sleeve 22 and the second end sleeve 31 are all provided with a seepage channel 25 communicated with the tail sleeve 23, and a piston assembly 26 for feeding back the grouting condition is arranged in the seepage channel 25. When the thick liquid is filled up, the thick liquid gets into in the seepage flow passageway 25 to promote piston assembly 26 and remove, operating personnel can learn the thick liquid time of filling up conveniently and accurately through piston assembly 26's moving state, improve the efficiency of construction.

Further, the piston assembly 26 includes a piston head 261 and a piston rod 262, the piston head 261 is disposed at one end of the piston rod 262, and the diameter of the piston head 261 is larger than the diameter of the piston rod 262. The diameter of the piston head 261 is equal to that of the seepage channel 25, which can effectively block the slurry from entering the seepage channel 25, and the piston head 261 can move in the seepage channel 25 to feed back the grouting condition.

Further, the piston rod 262 in the primary grouting sleeve 2 comprises a spliced piston rod 2621 and an anchor rod which are detachably connected, and the piston rod 262 in the secondary grouting sleeve 3 is the anchor rod. The piston rod 262 in the primary grouting sleeve 2 can be formed by splicing the spliced piston rod 2621 with anchor rods in different lengths, so that the grouting sleeve is suitable for rock mass grouting in different depths, and is wide in application range.

Further, one end of the first end sleeve 21, on which the first connection portion 211 is disposed, is provided with a first limiting boss 212 protruding toward the inflow direction of the seepage passage 25, a first limiting blocking piece 213 opposite to the first limiting boss 212 is disposed in the seepage passage 25 of the first end sleeve 21, and the first limiting boss 212 is provided with a first boss through hole 2121 communicated with the seepage passage 25. When the primary grouting sleeve 2 is formed, the piston head 261 in the piston assembly 26 is placed between the first limit boss 212 and the first limit stopper 213 in the first end sleeve 21 to limit the moving stroke of the piston assembly 26; during grouting, the piston head 261 abuts against the rear of the first limit boss 212, so that the piston head 261 is effectively limited from moving forwards and separating from the first end sleeve 21; when the grout is full, the grout enters through the first boss through hole 2121 and pushes the piston head 261 to move backwards, and the piston head 261 stops moving when contacting the first limiting blocking piece 213, so that an operator can conveniently and accurately judge the grouting condition, and meanwhile, the grout is effectively prevented from entering the seepage channel 25.

Furthermore, one end of the second end sleeve 31, which is provided with the second connecting portion 311, is provided with a second limiting boss 312 protruding in the inflow direction of the seepage passage 25, the seepage passage 25 of the tail sleeve 23 is provided with a second limiting baffle 232, and the second limiting boss 312 is provided with a second boss through hole 3121 communicated with the seepage passage 25. When the secondary grouting sleeve 3 is formed, the piston head 261 in the piston assembly 26 is placed between the second limit boss 312 in the second end sleeve 31 and the second limit baffle 232 in the tail sleeve 23 to limit the moving stroke of the piston assembly 26; during grouting, the piston head 261 abuts against the rear of the second limit boss 312, so that the piston head 261 is effectively limited from moving forwards and separating from the second end sleeve 31; when the thick liquid is full, the thick liquid passes through second boss through-hole 3121 and gets into and promote piston head 261 rearward movement, stops moving when piston head 261 contacts second spacing separation blade 232 to make things convenient for operating personnel to accurately judge the slip casting condition, effectively block the thick liquid simultaneously and get into in the seepage flow passageway 25.

Further, slip casting passageway 24 and slip casting mouth 231 quantity are four, four slip casting passageway 24 is along pipe wall circumference evenly distributed, slip casting direction and the axial of slip casting passageway 24 of slip casting mouth 231 are perpendicular, make the slip casting operation more convenient, and for single slip casting mouth 231 and slip casting passageway 24, its slip casting efficiency is higher, is favorable to saving the slip casting time for the engineering progress.

Further, the first connecting portion 211 includes a first buckle disposed on the outer surface of the first end sleeve 21. When the primary grouting bushing 2 is formed, the first connection portion 211 is fixed in combination with the second barrier 12 in the main body supporting structure 1 so as to perform grouting on the second section.

Further, the second connection portion 311 includes a second buckle 3111 and a limit baffle 3112 disposed on the outer surface of the second end sleeve 31. When forming second grade slip casting sleeve pipe 3, second connecting portion 311 combines fixedly with third baffle 12 in the main part supporting construction 1, wherein during second buckle 3111 card goes into third baffle 12, third baffle 12 rear end is located on the top of limit baffle 3112 and in order to restrict second grade slip casting sleeve pipe 3 and move forward, makes second grade slip casting sleeve pipe 3 be connected more stably firm with third baffle 12, is favorable to the slip casting to go on smoothly.

Further, the end of the first end sleeve 21 far away from the first connection portion 211 is provided with a first connection buckle 214, the end of the second end sleeve 31 far away from the second connection portion 311 is provided with a second connection buckle 313, one end of the splicing sleeve 22 is provided with a third connection buckle 221, the other end of the splicing sleeve is provided with a first connection hole 222 used for being connected with the first connection buckle 214, and the tail sleeve 23 is provided with a second connection hole 233 connected with the second connection buckle 313 or the third connection buckle 221. When the primary grouting casing 2 is formed, the first connecting buckle 214 on the first end casing 21 is connected with the first connecting hole 222 on the splicing casing 22, and the third connecting buckle 221 on the splicing casing 22 is connected with the second connecting hole 233 on the tail casing 23; when the second-stage grouting sleeve 3 is formed, the second connecting buckle 313 on the second end sleeve 31 is connected with the second connecting hole 233 on the tail sleeve 23, and the structure is simple, the connection is firm, and the installation is convenient.

Further, a casing connecting groove 121 for connecting the first-stage grouting casing 2 is formed in the second baffle 12, and a plurality of grouting through holes 124 which penetrate through the second baffle 12 and are used for allowing grout to pass through are formed in the casing connecting groove 121. The second baffle 12 is provided with a clamping groove 122 communicated with the sleeve connecting groove 121, and the side wall of the sleeve connecting groove 121 is provided with a first slide rail 123 communicated with the side wall of the clamping groove 122. When one-level slip casting sleeve 2 is connected with second baffle 12, the one end of one-level slip casting sleeve 2 gets into in the sleeve connecting groove 121, and simultaneously, first connecting portion 211 on one-level slip casting sleeve 2 combines with draw-in groove 122, rotatory one-level slip casting sleeve 2, make the slip casting passageway 24 of one-level slip casting sleeve 2 relative with the slip casting through-hole 124 in the second baffle 12, the guarantee thick liquid gets into in the second district section through the slip casting through-hole 124 in the second baffle 12 from the slip casting passageway 24 of one-level slip casting sleeve 2, in order to carry out the slip casting anchor to the second district section, make the connection of one-level slip casting sleeve 2 and second baffle 12 more firm simultaneously.

Further, a seepage through hole 125 is arranged in the casing connecting groove 121, and the plurality of grouting through holes 124 are uniformly and equidistantly arranged along the periphery of the seepage through hole 125. In this embodiment, the number of the grouting through holes 124 and the number of the grouting channels 24 are both 4, which is higher than that of a single grouting channel 24 and grouting through hole 124 in grouting efficiency; meanwhile, in this embodiment, the second baffle 12 is provided with a seepage through hole 125, which is opposite to the seepage channel 25 in the primary grouting casing 2, and is beneficial to providing a circulation channel for the excess grout to flow into the seepage channel 25.

Further, a sleeve through hole 131 for a first-stage grouting sleeve to pass through and a clamping hole 132 communicated with the sleeve through hole 131 and used for connecting a second-stage grouting sleeve are formed in the third baffle 13, and a second slide channel 133 communicated with the clamping hole 132 is formed in the side wall of the sleeve through hole 131. When the primary grouting sleeve 2 is connected with the second baffle plate 12, the primary grouting sleeve 2 passes through the sleeve through hole 131 in the third baffle plate 13, so as to be connected with the second baffle plate 12 at the front end; when second grade slip casting sleeve 3 is connected with third baffle 13, the one end of second grade slip casting sleeve 3 gets into in the sleeve pipe through-hole 131, simultaneously, second buckle 3111 on the second grade slip casting sleeve 3 combines with calorie hole 132, limit baffle 3112 on the second grade slip casting sleeve 3 supports the rear end of locating third baffle 13, rotatory second grade slip casting sleeve 3, thereby make second grade slip casting sleeve 3 and third baffle 13 form more stable connection, the thick liquid gets into in the third district section from second grade slip casting sleeve 3's slip casting passageway 24, in order to carry out the slip casting anchor to the third district.

Further, the length of the first slideway 123 is one fourth of the perimeter of the side wall of the casing connecting groove 121; the length of the second slide way 133 is one fourth of the circumference of the side wall of the sleeve through hole 131. As shown in fig. 8 and 9, the number of the clamping grooves 122 and the number of the first slide ways 123 in the second baffle plate 12 are two, the number of the clamping holes 132 and the number of the second slide ways 133 in the third baffle plate 13 are two, and the first slide ways 123 and the second slide ways 133 are both rotational symmetric, so that when the construction operation is performed, the connection with the second baffle plate 12 or the third baffle plate 13 is realized only by rotating the first grouting sleeve 2 or the second grouting sleeve 3 by 90 degrees, and the structure is simple and the operation is convenient.

Further, the number of the anchor cables 14 and the number of the reinforcing sections 16 are four, the anchor cables 14 and the reinforcing sections 16 are arranged at intervals, and each anchor cable 14 is formed by winding four high-strength steel stranded wires. The anchor cables 14 are combined with the reinforcing sections 16 in a supporting mode, and the anchor cables 14 and the reinforcing sections 16 are arranged at intervals, so that the stress is more uniform, and a better supporting effect is achieved.

Further, the stirring anchoring head 15 includes a stirring head baffle 151 and stirring rods 152 disposed at two ends of the stirring head baffle 151. As shown in fig. 6, the stirring rods 152 are uniformly arranged at both ends of the stirring head baffle 151, and the stirring anchor device has a simple structure and good stirring anchoring effect.

Further, the stock 17 is hollow structure and is equipped with a plurality of stock through-holes 171 that supply the thick liquid circulation on the lateral wall, the stock 17 is close to the one end of third baffle 13 and is equipped with piston 172, and the other end is equipped with and ends thick liquid stopper 173. By combining the anchor rods 17 with the anchor cables 14, a better supporting effect is achieved. In this embodiment, when carrying out the one-level slip casting to the second district, stock 17 constitutes the piston rod 262 that is used for one-level slip casting sleeve 2 with the concatenation piston rod 2621 concatenation, when carrying out the second grade slip casting to the third district, and stock 17 can regard as piston rod 262, is favorable to improving the utilization ratio of stock.

Further, the anchor cable bolt fixing assembly 18 includes an anchor cable base plate 181 and an anchor cable nut 182 for fixing the anchor cable 14, the anchor cable base plate 181 is provided with an anchor rod base plate 183 and an anchor rod nut 184 for fixing the anchor rod 17, and one end of the anchor rod base plate 183 close to the anchor cable base plate 181 is provided with an anchor cable nut groove 1831 for embedding the anchor cable nut 182. The anchor rope backing plate 181 is provided with through holes for the anchor rope 14 and the anchor rod 17 to pass through respectively, the anchor rope 14 is fixed through the anchor rope backing plate 181 and the anchor rope nut 182, the anchor rod backing plate 183 is installed behind the anchor rope backing plate 181, the anchor rod 17 penetrates through the anchor rope backing plate 181 and the anchor rod backing plate 183 simultaneously, enters a fourth section to be supported together with the anchor rope 14, and finally the anchor rod 17 is fixed through the anchor rod bolt 184, so that the main body supporting structure 1 is more stable and firm.

The roadway surrounding rock supporting method for applying the pretightening force in a grading manner by adopting the roadway surrounding rock supporting structure capable of applying the pretightening force in a grading manner comprises the following steps:

step 1: drilling a hole, and dividing the rock mass into a first section, a second section, a third section and a fourth section according to the rock mass crushing condition in the hole.

The first section is a deep intact rock body and marked as X1 m, the second section is a relatively intact rock body and marked as X2 m, the third section is a relatively broken rock body and marked as X3 m, the fourth section is a shallow broken rock body and marked as X4 m, the length of the anchor rope and the relative positions of the first baffle 11, the second baffle 12 and the third baffle 13 on the anchor rope 14 are determined according to X1, X2, X3 and X4, and the first baffle 11, the second baffle 12, the third baffle 13 and the stirring anchor head 15 are welded at the corresponding positions of the anchor rope 14 to form a basic supporting structure.

Step 2: anchoring of the first segment: and (3) placing the anchoring agent into the first section, extending the basic supporting structure into the first section along the pore channel, rotating and stirring to fully mix and bond the stirring anchoring head 15 positioned at the head end of the basic supporting structure and the anchoring agent, and applying first pre-tightening force to the anchor cable 14 after the anchoring agent is solidified.

And step 3: anchoring of the second segment: and (3) extending the primary grouting sleeve along the pore channel and combining the primary grouting sleeve with a second baffle 12 in the foundation support structure, grouting the second section, withdrawing the primary grouting sleeve 2 after the grout is solidified, and applying a second pre-tightening force to the anchor cable 14. Wherein, during grouting, grouting is stopped when the piston head in the piston assembly 26 moves to the first limit stop piece 213.

And 4, step 4: anchoring of the third segment: extending the secondary grouting sleeve 3 along the pore passage and combining with a third baffle 13 in the foundation support structure, filling the third section with grout, withdrawing the secondary grouting sleeve 3 after the grout is solidified, and applying third pre-tightening force to the anchor cable 14; wherein, during grouting, the grouting is stopped when the piston head in the piston assembly 26 moves to the second limit stop sheet 232.

And 5: anchoring of the fourth segment: installing an anchor rope backing plate 181 at the tail end of an anchor rope 14, placing an anchoring agent into the rear end of a third baffle plate 13 in a basic supporting structure along a pore channel, extending an anchor rod 17 into the foundation supporting structure along the anchor rope backing plate 181, rotationally stirring the anchor rod 17 to enable the end part of the anchor rod 17 to be fully mixed and bonded with the anchoring agent, installing an anchor rod backing plate 183 after the anchoring agent is solidified, filling slurry into a fourth section along the anchor rod 17, and applying fourth pre-tightening force to the anchor rod 17 after the slurry is solidified; the main body supporting structure 1 is finally formed by combining the anchor rods 17 and the anchor cable and anchor rod fixing assemblies 18 with the basic supporting structure.

According to the roadway surrounding rock supporting method capable of applying pretightening force in a grading manner, the rock body is divided into four sections according to the spatial difference of the rock body, different supporting structures and supporting modes are adopted for different sections, so that differentiated supporting of the spatially-different rock body is realized, the supporting structure combining anchor rod supporting and anchor cable supporting is adopted in the method, the method is more suitable for the construction environment of a deep high-stress roadway by combining anchoring agent anchoring and grouting anchoring, and the method is more firm than the common single anchoring supporting mode of the anchor rod or the anchor cable and the single anchoring agent anchoring or grouting anchoring, and has a more obvious anchoring effect.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. Be applied to dismantled slip casting sleeve pipe that tunnel country rock was strutted, its characterized in that: comprises a first end sleeve (21), a splicing sleeve (22), a tail sleeve (23) and a second end sleeve (31), the first end sleeve (21), the splicing sleeve (22) and the second end sleeve (31) are all provided with grouting channels (24) communicated with the tail sleeve (23), the tail sleeve (23) is provided with a grouting opening (231), the grouting opening (231) is communicated with the grouting channel (24), the first end casing (21), the splicing casing (22) and the tail casing (23) are sequentially connected to form a primary grouting casing (2), the second end sleeve (31) and the tail sleeve (23) are connected to form a secondary grouting sleeve (3), the first end sleeve (21) is provided with a first connecting part (211) for connecting a second baffle plate in the main body supporting structure, and a second connecting part (311) for connecting a third baffle plate in the main body supporting structure is arranged on the second end sleeve (31).

2. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 1, is characterized in that: and the first end sleeve (21), the splicing sleeve (22) and the second end sleeve (31) are respectively provided with a seepage channel (25) communicated with the tail sleeve (23), and a piston assembly (26) for feeding back the grouting condition is arranged in the seepage channel (25).

3. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 2, is characterized in that: the one end that is equipped with first connecting portion (211) on first tip sleeve pipe (21) is equipped with to seepage flow channel (25) flow in the bellied first spacing boss (212) of direction, be equipped with in seepage flow channel (25) of first tip sleeve pipe (21) with first spacing boss (212) relative first spacing separation blade (213), be equipped with on first spacing boss (212) with the first boss through-hole (2121) of seepage flow channel (25) intercommunication.

4. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 2, is characterized in that: the one end that is equipped with second connecting portion (311) on second tip sleeve pipe (31) is equipped with to seepage flow channel (25) flow in the bellied spacing boss of second of direction (312), be equipped with spacing separation blade of second (232) in seepage flow channel (25) of afterbody sleeve pipe (23), be equipped with on the spacing boss of second (312) with seepage flow channel (25) intercommunication second boss through-hole (3121).

5. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 2, is characterized in that: the piston assembly (26) comprises a piston head (261) and a piston rod (262), wherein the piston head (261) is arranged at one end of the piston rod (262), and the diameter of the piston head (261) is larger than that of the piston rod (262).

6. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 5, characterized in that: the piston rod (262) in the primary grouting sleeve (2) comprises a spliced piston rod (2621) and an anchor rod which are detachably connected, and the piston rod (262) in the secondary grouting sleeve (3) is the anchor rod.

7. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 1, is characterized in that: slip casting passageway (24) and slip casting mouth (231) quantity are four, four slip casting passageway (24) are along pipe wall circumference evenly distributed, the slip casting direction of slip casting mouth (231) is perpendicular with the axial of slip casting passageway (24).

8. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 1, is characterized in that: the first connecting portion (211) comprises a first buckle arranged on the outer surface of the first end sleeve (21).

9. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 1, is characterized in that: the second connecting portion (311) comprises a second buckle (3111) and a limiting baffle (3112) which are arranged on the outer surface of the second end sleeve (31).

10. The detachable grouting sleeve applied to roadway surrounding rock support according to claim 1, is characterized in that: keep away from the one end of first connecting portion (211) on first tip sleeve pipe (21) and be equipped with first connector link (214), the one end of keeping away from second connecting portion (311) on second tip sleeve pipe (31) is equipped with second connector link (313), concatenation sleeve pipe (22) one end is equipped with third connector link (221), and the other end is equipped with first connecting hole (222) that are used for being connected with first connector link (214), be equipped with on afterbody sleeve pipe (23) with second connector link (313) or third connector link (221) second connecting hole (233) of being connected.

Images