阅读说明：本技术 一种玄武岩纤维精准分段注浆锚固系统及其安装方法 (Basalt fiber accurate sectional grouting anchoring system and installation method thereof ) 是由 代贞伟 周盛涛 付小林 张彦君 张安乐 郭进军 于 2021-09-24 设计创作，主要内容包括：本发明提供一种玄武岩纤维精准分段注浆锚固系统及其安装方法,系统包括：设置于锚固钻孔内的多个第一垫板,每两个第一垫板分别设置于对应待注浆段上下两端；贯穿多个第一垫板的多根玄武岩纤维筋；以及注浆装置,其包括阀管和注浆芯管,阀管贯穿全部第一垫板,阀管管壁设有多个注浆口,且每一注浆口均被弹性皮套覆盖,注浆芯管上间隔套设有两密封止浆塞,两密封止浆塞之间设有多个出浆口,两密封止浆塞在移动进入待注浆段后,浆液由各出浆口喷出,弹性皮套受压打开,进而使浆液由各注浆口注入阀管与锚固钻孔之间。本发明的有益效果：利用阀管和注浆芯管实现锚固钻孔精准注浆,采用同源材料变刚度夹片和变刚度裹握片可直接张拉锚固玄武岩纤维筋。(The invention provides a basalt fiber precise sectional grouting anchoring system and an installation method thereof, wherein the system comprises: the first base plates are arranged in the anchoring drill holes, and every two first base plates are respectively arranged at the upper end and the lower end of the corresponding section to be grouted; a plurality of basalt fiber ribs penetrating the plurality of first backing plates; and the grouting device comprises a valve pipe and a grouting core pipe, wherein the valve pipe penetrates through all the first base plates, the pipe wall of the valve pipe is provided with a plurality of grouting openings, each grouting opening is covered by an elastic leather sheath, two sealing grout stop plugs are arranged on the grouting core pipe in a spaced manner, a plurality of grout outlets are formed between the two sealing grout stop plugs, after the two sealing grout stop plugs move to enter a section to be grouted, grout is sprayed out from each grout outlet, the elastic leather sheath is pressed to be opened, and then the grout is injected between the valve pipe and the anchoring drill hole from each grouting opening. The invention has the beneficial effects that: the valve pipe and the grouting core pipe are utilized to realize accurate grouting of anchoring drilling, and the basalt fiber ribs can be directly tensioned and anchored by adopting the variable-rigidity clamping pieces and the variable-rigidity wrapping pieces made of homologous materials.)

1. The utility model provides a basalt fiber accurate segmentation slip casting anchor system which characterized in that includes:

the first base plates are arranged in the anchoring drill holes, the number of the first base plates is twice that of the sections to be grouted, the upper end and the lower end of each section to be grouted are respectively provided with one first base plate, the two first base plates form one group, and each group of first base plates are respectively arranged at the upper end and the lower end of the section to be grouted;

the basalt fiber ribs are arranged in the anchoring drill holes, and each basalt fiber rib penetrates through all the first base plates;

and the grouting device comprises a valve pipe and a grouting core pipe arranged in the valve pipe, the valve pipe penetrates through all the first base plates, the pipe wall of the valve pipe is provided with a plurality of grouting openings, each grouting opening is covered by an elastic leather sheath, the upper spacing sleeve of the grouting core pipe is provided with two sealing grout stop plugs, the two sealing grout stop plugs are contacted with the inner wall of the valve pipe, the pipe wall of the grouting core pipe is positioned between the two sealing grout stop plugs and is provided with a plurality of grout outlets, after the two sealing grout stop plugs move to each section to be grouted, grout is sprayed out from each grout outlet, the pressure between the grouting core pipe and the valve pipe is increased, the upper end and the lower end of the elastic leather sheath are pressed to curl towards the middle part, and then the grout is injected between the valve pipe and the anchoring drill hole through each grouting opening.

2. The basalt fiber precision segment grouting anchoring system of claim 1, wherein: the valve pipe is provided with a plurality of radial cross sections at intervals along the length direction, the grouting openings are uniformly distributed on each radial cross section, each radial cross section is sleeved with an elastic leather sheath, and each grouting opening on the same radial cross section is covered by the elastic leather sheath.

3. The basalt fiber precision segment grouting anchoring system of claim 2, wherein: each grouting opening comprises two sub-grouting openings which are arranged at intervals up and down, grouting pressure acts on the elastic leather sleeve through the two sub-grouting openings, and the two ends of the elastic leather sleeve curl towards the middle part under the action of the grouting pressure, so that grout can be smoothly injected into a gap between the drill hole and the valve pipe, and the purpose of grouting is achieved.

4. A basalt fiber precision stage grouting anchoring system as claimed in claim 3, wherein: the two first base plates at two ends of each section to be grouted are connected through a plurality of fixed rods, two ends of each fixed rod penetrate through the two first base plates and are connected with fasteners located on the outer sides of the first base plates, and diameter expanding sections which are abutted against the inner sides of the first base plates are correspondingly arranged on the fixed rods.

5. The basalt fiber precision segment grouting anchoring system of claim 1, wherein: the basalt fiber reinforced concrete anchor drilling device comprises a precast concrete hole plug arranged at the position of an anchor drilling hole and a second base plate arranged in the anchor drilling hole and close to the precast concrete hole plug, wherein each basalt fiber rib and the valve pipe penetrate through the precast concrete hole plug and the second base plate, and an outer grouting pipe penetrating through the upper end and the lower end of the precast concrete hole plug is arranged on the precast concrete hole plug.

6. The basalt fiber precision segment grouting anchoring system of claim 5, wherein: the basalt fiber reinforced bar tensioning device comprises a reaction frame fixed outside an anchoring drilling hole opening, an anchor ring, a limiting plate, a penetrating jack and a plurality of homologous material variable-rigidity wrapping sheets, wherein the anchor ring, the limiting plate, the penetrating jack and the homologous material variable-rigidity wrapping sheets are sequentially arranged on the reaction frame from bottom to top, and the basalt fiber reinforced bar sequentially penetrates through the reaction frame, the anchor ring, the limiting plate and the penetrating jack and is tightly held by the homologous material variable-rigidity wrapping sheets.

7. The basalt fiber precision segment grouting anchoring system of claim 6, wherein: the anchor ring is provided with a plurality of anchor holes, a group of homologous material variable-rigidity clamping pieces are arranged in each anchor hole, and the basalt fiber bars penetrate through the anchor holes and are surrounded and clamped by the homologous material variable-rigidity clamping pieces.

8. The basalt fiber precision segment grouting anchoring system of claim 7, wherein: the rigidity-variable clamping piece made of the homologous material is a conical block, the outer diameter of the conical block is gradually increased from bottom to top, and the clamping piece is provided with a nylon section, a basalt fiber section and a carbon fiber section.

9. The basalt fiber precision segment grouting anchoring system of claim 6, wherein: the variable-rigidity wrapping sheet made of the homologous material comprises two semicircular clamp holding sheets which are detachably connected, and each clamp holding sheet comprises a nylon layer, a basalt fiber layer and a carbon fiber layer from inside to outside.

10. The installation method of the basalt fiber precise sectional grouting anchoring system is characterized by comprising the following steps: use of a basalt fiber precision slip casting anchoring system according to any one of claims 1 to 9 and comprising the steps of:

s1, acquiring full borehole images of the inner wall of the anchoring borehole by using an underground television, analyzing the development condition of rock mass cracks in the anchoring borehole, further determining the number, the length and the specific position of sections to be grouted, and simultaneously determining the installation position of the second base plate;

s2, respectively installing a first base plate at the upper end and the lower end of each section to be grouted corresponding to the valve pipe, connecting two corresponding first base plates at the upper end and the lower end of each section to be grouted by a fixing rod, installing a second base plate, penetrating the basalt fiber ribs through all the first base plates and the second base plates, and putting the basalt fiber ribs and the valve pipe into the anchoring drill hole;

s3, inserting the grouting core pipe into the bottom of the valve pipe, moving the grouting core pipe upwards, controlling the grouting core pipe to spray grout from each grout outlet when the two sealing grout stopping plugs move to each section to be grouted, increasing the pressure between the grouting core pipe and the valve pipe, enabling the upper end and the lower end of the elastic leather sheath to be pressed and curled towards the middle part, further enabling the grout to be injected between the valve pipe and the anchoring drill holes from each grouting opening until the grouting grout fills the gaps between the anchoring drill holes of the grouting sections and the two first base plates and the valve pipe, and stopping grouting; s4, when the strength of the high-strength cement mortar anchoring section in the anchoring drill hole reaches the tensile strength, sleeving a prefabricated high-strength concrete hole plug, installing a reaction frame outside the anchoring drill hole, enabling all basalt fiber bars to penetrate through the reaction frame, sequentially installing an anchor ring, a limiting plate and a through jack at the upper end of the reaction frame, sequentially enabling all the basalt fiber bars to penetrate through the anchor ring, the limiting plate and the through jack, installing homologous material variable-rigidity clamping pieces in each anchor hole of the anchor ring, clamping each basalt fiber bar, installing homologous material variable-rigidity wrapping holding pieces at the upper ends of all the basalt fiber bars, and clamping the wrapped basalt fiber bars by the homologous material variable-rigidity wrapping holding pieces; s5, starting the center-penetrating jack, integrally tensioning the basalt fiber bars, and when the basalt fiber bars are tensioned to a designed anchoring force, injecting early-strength micro-expansion cement mortar into a gap between the prefabricated high-strength concrete hole plug and the second base plate through an outer grouting pipe until grouting slurry is filled in gaps among the basalt fiber bars, the valve pipe, the prefabricated high-strength concrete hole plug and the second base plate, and stopping grouting;

s6, when the early strength micro-expansion cement mortar reaches the target strength, locking each basalt fiber rib at the anchor head by the prefabricated high-strength concrete hole plug, closing the through jack, cutting off each basalt fiber rib along the upper surface of the prefabricated high-strength concrete hole plug, disassembling the tensioning device, and completing construction of the tensile basalt fiber anchor cable.

Technical Field

The invention relates to the technical field of geological disaster prevention and control, in particular to a basalt fiber precise sectional grouting anchoring system and an installation method thereof.

Background

The reservoir region canyon bank slope hydro-fluctuation belt is reinforced with steel prestressed anchor cables which are commonly used at present, but the bank slope hydro-fluctuation belt is often influenced by seasonal water level changes, and the traditional steel anchor cables are easy to corrode, so that certain potential safety hazards are brought to the reservoir bank slope permanent anchoring engineering. At the present stage, the appearance of a large number of novel fiber reinforced composite anchor rods (cables) provides a new idea for reinforcing the hydro-fluctuation belt of the bank slope. The tensile strength of the basalt fiber bars is greater than 1.1GPa, the density of the basalt fiber bars is 1/3-1/4 of steel bars, the basalt fiber bars have the advantages of good corrosion resistance, high stability, low raw material cost and the like, are green and environment-friendly light anchor cable manufacturing materials, and are expected to replace steel anchor cables to be applied to the field of bank slope rock mass anchoring. In addition, the rock mass of the hydro-fluctuation belt is easy to form a solution channel and a solution groove under the action of long-term variation of reservoir water level, joint cracks develop in large quantity, and slurry leakage is easy to occur by adopting the traditional anchor cable grouting process, so that smooth construction cannot be realized.

Disclosure of Invention

In view of this, in order to solve the grouting problem in the reinforcing engineering of the basalt fiber reinforced anchor cable of the hydro-fluctuation belt rock mass of the canyon bank slope in the reservoir area, the embodiment of the invention provides an accurate sectional grouting anchoring system for basalt fiber and an installation method thereof.

The embodiment of the invention provides a basalt fiber accurate sectional grouting anchoring system, which comprises:

the first base plates are arranged in the anchoring drill holes, the number of the first base plates is twice that of the sections to be grouted, the upper end and the lower end of each section to be grouted are respectively provided with one first base plate, the two first base plates form one group, and each group of first base plates are respectively arranged at the upper end and the lower end of each section to be grouted;

the basalt fiber ribs are arranged in the anchoring drill holes, and each basalt fiber rib penetrates through all the first base plates;

and the grouting device comprises a valve pipe and a grouting core pipe arranged in the valve pipe, the valve pipe penetrates through all the first base plates, the pipe wall of the valve pipe is provided with a plurality of grouting openings, each grouting opening is covered by an elastic leather sheath, two sealing grout stop plugs are arranged on the grouting core pipe in a spacing sleeve manner and are in contact with the inner wall of the valve pipe, a plurality of grout outlet openings are formed in the position, between the two sealing grout stop plugs, of the pipe wall of the grouting core pipe, the two sealing grout stop plugs move to the section to be grouted, grout is sprayed out from the grout outlet openings, the pressure between the grouting core pipe and the valve pipe is increased, the upper end and the lower end of the elastic leather sheath are pressed to curl towards the middle part, and then the grout is injected into a gap between the valve pipe and the anchoring drill hole through the grouting openings.

Furthermore, the valve pipe is provided with a plurality of radial cross sections for arranging the grouting ports at intervals along the length direction, a plurality of grouting ports are uniformly distributed on each radial cross section, each radial cross section is sleeved with one elastic leather sheath, and each grouting port on the same radial cross section is covered by the elastic leather sheath.

Furthermore, each grouting opening comprises two sub-grouting openings which are arranged at intervals up and down, grouting pressure acts on the elastic leather sleeve through the two sub-grouting openings, and the two ends of the elastic leather sleeve curl towards the middle under the action of the grouting pressure, so that grout can be smoothly injected into a gap between the anchoring drill hole and the valve pipe, and the purpose of grouting is achieved.

Furthermore, the two first base plates at the two ends of each section to be grouted are connected through a plurality of fixing rods, the two ends of each fixing rod penetrate through the two first base plates and are connected with fasteners located on the outer sides of the first base plates, and the fixing rods are correspondingly provided with diameter expanding sections which are abutted against the inner sides of the first base plates.

And furthermore, the device comprises a precast concrete hole plug arranged at the anchoring drill hole and a second base plate arranged in the anchoring drill hole and close to the precast concrete hole plug, each basalt fiber bar and the valve pipe penetrate through the precast concrete hole plug and the second base plate, and the precast concrete hole plug is provided with an outer grouting pipe penetrating through the upper end and the lower end of the precast concrete hole plug.

The basalt fiber bar sequentially penetrates through the reaction frame, the anchor ring, the limiting plate and the penetrating jack and is tightly held by the variable-rigidity holding sheets made of the homologous materials.

Furthermore, a plurality of anchor holes are formed in the anchor ring, a group of homologous material variable-rigidity clamping pieces are arranged in each anchor hole, and the basalt fiber bars penetrate through the anchor holes and are surrounded and clamped by the homologous material variable-rigidity clamping pieces.

Furthermore, the rigidity-variable clamping piece made of the homologous material is a conical block, the outer diameter of the conical block is gradually increased from bottom to top, and the clamping piece is provided with a nylon section, a basalt fiber section and a carbon fiber section.

Furthermore, the variable-rigidity wrapping sheet made of the homologous material comprises two semicircular clamp holding sheets which are detachably connected, and each clamp holding sheet comprises a nylon layer, a basalt fiber layer and a carbon fiber layer from inside to outside.

In addition, the embodiment of the invention also provides an installation method of the basalt fiber precise sectional grouting anchoring system, the basalt fiber precise sectional grouting anchoring system is used, and the installation method comprises the following steps:

s1, acquiring full borehole images of the inner wall of the anchoring borehole by using an underground television, analyzing the development condition of rock mass cracks in the anchoring borehole, further determining the number, the length and the specific position of sections to be grouted, and simultaneously determining the installation position of the second base plate;

s2, respectively installing a first base plate at the upper end and the lower end of each section to be grouted corresponding to the valve pipe, connecting two corresponding first base plates at the upper end and the lower end of each section to be grouted by a fixing rod, installing a second base plate, penetrating the basalt fiber ribs through all the first base plates and the second base plates, and then putting the basalt fiber ribs and the valve pipe into the anchoring drill hole;

s3, inserting the grouting core pipe into the bottom of the valve pipe, moving the grouting core pipe upwards, controlling the grouting core pipe to spray grout from each grout outlet when the two sealing grout stopping plugs move to each section to be grouted, increasing the pressure between the grouting core pipe and the valve pipe, enabling the upper end and the lower end of the elastic leather sheath to be pressed and curled towards the middle part, further enabling the grout to be injected between the valve pipe and the anchoring drill holes from each grouting opening until the grouting grout fills the gaps between the anchoring drill holes of the grouting sections and the two first base plates and the valve pipe, and stopping grouting;

s4, when the strength of the high-strength cement mortar anchoring section in the anchoring drill hole reaches the tensile strength, sleeving a prefabricated high-strength concrete hole plug, installing a reaction frame outside the anchoring drill hole, enabling all basalt fiber bars to penetrate through the reaction frame, sequentially installing an anchor ring, a limiting plate and a center penetrating jack at the upper end of the reaction frame, and enabling all the basalt fiber bars to penetrate through the anchor ring, the limiting plate and the center penetrating jack. Mounting homologous material variable-rigidity clamping pieces in each anchor hole of the anchor ring to clamp each basalt fiber bar, mounting homologous material variable-rigidity wrapping pieces at the upper ends of the basalt fiber bars, and tightly holding the wrapped basalt fiber bars by the homologous material variable-rigidity wrapping pieces;

s5, starting the center-penetrating jack 18, integrally tensioning the basalt fiber bars 2, and when the basalt fiber bars are tensioned to a designed anchoring force, injecting early-strength micro-expansion cement mortar into a gap between the prefabricated high-strength concrete hole plug and the second base plate through an outer grouting pipe until the early-strength micro-expansion cement mortar is full of gaps among the basalt fiber bars, the valve pipe, the prefabricated high-strength concrete hole plug and the second base plate, and stopping grouting;

s6, when the early strength micro-expansion cement mortar reaches the target strength, locking each basalt fiber rib at the anchor head by the prefabricated high-strength concrete hole plug, closing the through jack, cutting off each basalt fiber rib along the upper surface of the prefabricated high-strength concrete hole plug, disassembling the tensioning device, and completing construction of the tensile basalt fiber anchor cable.

The technical scheme provided by the embodiment of the invention has the following beneficial effects: according to the development condition of the joint fissure of the rock body at the wall of the anchoring drill hole, a plurality of sections to be grouted are designed in the non-development section of the joint fissure of the rock body, accurate segmented grouting is realized for the anchoring drill hole, and the problem that grout is easy to leak along the joint fissure when grouting is carried out on an anchor cable in a fractured rock body stratum is effectively solved; when each section to be grouted is grouted, the elastic leather sheath is opened under the action of grouting pressure, and after grouting is finished, the elastic leather sheath restores the original shape to cover the grouting opening again, so that grout in the grouted section is prevented from being refilled, and the problem of grout refilling in the accurate grouting process is effectively solved; the basalt fiber anchor cable is directly prestressed (drawing force) by utilizing the homologous material variable-stiffness clamping piece and the homologous material variable-stiffness gripping piece, so that the phenomenon that a loading end of the clamping piece is subjected to large stress concentration can be effectively avoided, and the basalt fiber rib is prevented from being pinched off in the drawing process.

Drawings

FIG. 1 is a schematic view of a basalt fiber precision sectional grouting anchoring system of the present invention;

FIG. 2 is a schematic view of the grouting apparatus of FIG. 1;

fig. 3 is a schematic view of the first mat 1 of fig. 1;

FIG. 4 is a schematic view of the connection of two first mats 1;

FIG. 5 is a schematic view of a tensioning device;

FIG. 6 is a schematic view of the variable stiffness grip tab 19 of the homologous material of FIG. 5;

FIG. 7 is a schematic view of the homogeneous material variable stiffness clip 20 of FIG. 5;

fig. 8 is a schematic view of a set of homogeneous material variable stiffness clips 20 gripping basalt fiber strands 2.

In the figure: 1-first cushion plate, 101-rubber sealing ring, 102-grouting perforation, 103-tendon perforation, 102a/103 a-rubber sealing ring, 104-fixed perforation, 2-basalt fiber tendon, 3-valve pipe, 4-grouting core pipe, 5-elastic leather sheath, 6-section to be grouted, 7-precast concrete hole plug, 8-outer grouting pipe, 9-second cushion plate, 10-joint crack, 11-sealing stop plug, 12-grout outlet, 13 a-sub grouting port, 14-fixed rod, 14 a-expanding section, 14 b-fastener, 14 c-rubber sealing gasket, 15-reaction frame, 16-anchor ring, 17-limiting plate, 18-penetrating jack, 19-homologous material variable-rigidity wrapping and holding piece, 19 a-nylon layer, 19 b-basalt fiber layer, 19 c-carbon fiber layer, 19 d-extension sheet, 20-homologous material variable-rigidity clamping piece, 20 a-nylon section, 20 b-basalt fiber section, 20 c-carbon fiber section, 21-clamping nut and 22-clamping screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, 2 and 5, an embodiment of the present invention provides a basalt fiber precise sectional grouting anchoring system, which mainly includes a plurality of first base plates 1, a plurality of basalt fiber ribs 2, a grouting device and a tensioning device, wherein the number of the first base plates 1 is twice of the number of the sections 6 to be grouted.

Wherein, the upper and lower both ends of each section 6 of treating the slip casting are respectively equipped with one first backing plate 1. The first shim plate 1 here has the shape of a disc, the outer wall of which is in abutting contact with the anchoring borehole. Preferably the outer wall cover of first backing plate 1 is equipped with rubber seal 101, rubber seal 101 can make first backing plate 1 outer wall with the inseparable laminating of anchor drilling inner wall can guarantee better shutoff slip casting thick liquid.

Referring to fig. 3 and 4, in order to facilitate the installation arrangement of the two first mats 1, the two first mats 1 may be arranged in a group. Two ends of each fixing rod 14 penetrate through the two first base plates 1 and are connected with a fastening piece 14b located on the outer sides of the first base plates 1, diameter expanding sections 14a abutting against the inner sides of the first base plates 1 are arranged at the end parts, close to the two ends of the fixing rods 14, and the diameter expanding sections 14a are matched with the fastening pieces 14b to clamp the first base plates 1. The fastener 14b may be selected from a variety of options, and is specifically a retaining nut that is threadably coupled to the end of the retaining rod 14. Preferably, the first pad 1 is provided with a fixing through hole 104, the fixing rod 14 passes through the fixing through hole 104, and a rubber gasket 14c is arranged in the fixing through hole 104 to realize sealing.

The number of the sections 6 to be grouted is determined by the depth of the anchoring drill hole and geological features, and a plurality of the sections 6 to be grouted are generally present. When the number of the sections 6 to be grouted is multiple, two first base plates 1 at two ends of each section 6 to be grouted are connected through a plurality of fixing rods 14 and are arranged in pairs.

The method comprises the steps that a plurality of basalt fiber ribs 2 to be anchored are arranged in anchoring drill holes, specifically, a plurality of rib penetrating through holes 103 for the basalt fiber ribs 2 to penetrate through are formed in a first base plate 1, each basalt fiber rib 2 penetrates through all the first base plates 1 of the sections to be grouted 6, and rubber sealing rings 103a for enhancing sealing effect are arranged in the rib penetrating through holes 103. The basalt fiber ribs 2 are uniformly distributed around the axis of the first base plate 1 to ensure uniform stress after grouting.

The grouting device is used for grouting each section 6 to be grouted. The grouting device comprises a valve pipe 3 and a grouting core pipe 4 arranged in the valve pipe 3. The middle part of the first base plate 1 is also provided with a grouting perforation 102 for the valve pipe 3 to pass through, the valve pipe 3 passes through each first base plate 1, namely passes through each section 6 to be grouted, and a rubber sealing ring 102a for strengthening the sealing effect is arranged in the grouting perforation 102. Valve pipe 3 is lower extreme confined body, just 3 pipe walls of valve pipe are equipped with a plurality of slip casting mouth 13 and a plurality of slip casting mouth 13 overcoat on the same radial cross-section and are equipped with an elasticity leather sheath 5, and elasticity leather sheath 5 internal diameter slightly is less than 3 outer wall diameters of valve pipe, takes place certain elastic deformation when elasticity leather sheath 5 installs, makes it can hoop the cover and locate 3 outer walls of valve pipe.

The injection ports 13 are spaced along the length of the valve tube 3, and may be arranged in various ways. Preferably, the valve tube 3 is provided with a plurality of radial cross sections for arranging the grouting ports 13 at intervals along the length direction, each radial cross section is uniformly provided with a plurality of grouting ports 13, each radial cross section is sleeved with one elastic leather sheath 5, and each grouting port 13 is covered by the elastic leather sheath 5.

In addition, a plurality of connection matching modes are arranged between the elastic leather sheath 5 and the grouting opening 13. Here, each of the grouting ports 13 includes two sub-grouting ports 13a spaced up and down, the two sub-grouting ports 13a are covered by one of the elastic leather sheath 5, grouting pressure is applied to the elastic leather sheath 5 through the two sub-grouting ports 13a, the upper and lower ends of the elastic leather sheath 5 are curled toward the middle after being pressed, and grout is injected into a gap between the anchor drill and the valve pipe 3 through the two sub-grouting ports 13 a. The elastic leather sheath 5 can be selected from a rubber leather sheath.

The grouting core pipe 4 can be inserted into the valve pipe 3, two sealing grout stopping plugs 11 are arranged on the grouting core pipe 4 in a spaced manner, and the two sealing grout stopping plugs 11 can slide up and down along the inner wall of the valve pipe 3. And a plurality of grout outlets 12 are formed in the pipe wall of the grouting core pipe 4 between the two sealing grout stopping plugs 11. The outer wall of the sealing slurry stop plug 11 is in contact sealing with the inner wall of the valve pipe 3, and the number of the sealing slurry stop plugs 11 above or below the sealing slurry stop plug 11 can be two or more, so as to ensure the sealing effect. The grout outlets 12 should be uniformly distributed as much as possible so that grout in the grouting core pipe 4 can be uniformly sprayed out.

When the grouting core pipe 4 passes through each section 6 to be grouted, after the two sealing grout stop plugs 11 move to the section 6 to be grouted, grout pumped into the grouting core pipe 4 is sprayed out from the grout outlets 12, so that the pressure between the grouting core pipe 4 and the valve pipe 3 is increased, the upper end and the lower end of the elastic leather sheath 5 are pressed to be curled towards the middle, and then the grout is injected between the valve pipe 3 and the anchoring drill hole through the grouting ports 13.

In addition, a second base plate 9 is arranged close to the anchoring drilling hole, the basalt fiber ribs 2 and the valve pipe 3 penetrate through the second base plate 9, and precast concrete hole plugs 7 are arranged on the second base plate 9 and the anchoring drilling hole. The upper end of the precast concrete hole plug 7 is of an expanding structure, the precast concrete hole plug 7 is placed in the anchoring drill hole, the upper end of the precast concrete hole plug is supported and fixed by the expanding structure, and the lower end of the precast concrete hole plug is close to but not in contact with the second base plate 9. And the precast concrete hole plug 7 is provided with an outer grouting pipe 8 and a plurality of through holes. The second base plate 9 has the same structure as the first base plate 1, and the upper ends of the basalt fiber bars 2 and the valve pipes 3 penetrate through the second base plate 9 and the through holes of the precast concrete hole plugs 7 so as to extend out of the anchoring drill holes.

The outer grouting pipe 4 is used for grouting early strength micro-expansion cement mortar, so that the tensioned basalt fiber rib 2, the valve pipe 3, the prefabricated high-strength concrete hole plug 7, the second base plate 9 and the anchoring drill hole are cast into a whole, and the second base plate 9 is used for preventing the early strength micro-expansion cement mortar from infiltrating downwards.

Referring to fig. 5, the tensioning device is disposed outside the anchoring drilling hole, and includes a reaction frame 15 fixed outside the anchoring drilling hole, an anchor ring 16, a limiting plate 17, a penetrating jack 18 and a plurality of homologous material variable stiffness wrapping sheets 19 sequentially disposed on the reaction frame 15 from bottom to top, an upper end of each basalt fiber rib 2 sequentially penetrates through the reaction frame 15, the anchor ring 16, the limiting plate 17, the penetrating jack 18 and the homologous material variable stiffness wrapping sheets 19, and a bottom of the homologous material variable stiffness wrapping sheets 19 is supported on an upper surface of the penetrating jack 18 and clamps the basalt fiber rib 2.

Referring to fig. 7 and 8, a plurality of anchor holes are formed in the anchor ring 16, a group of homologous material variable-stiffness clips 20 is disposed in each of the anchor holes, the group of homologous material variable-stiffness clips 20 includes a plurality of conical homologous material variable-stiffness clips 20, the homologous material variable-stiffness clips 20 are conical blocks, the outer diameters of the conical blocks are gradually increased from bottom to top, and each of the conical blocks is provided with a nylon segment 20a, a basalt fiber segment 20b, and a carbon fiber segment 20 c. The basalt fiber bar 2 penetrates through the anchor hole and is surrounded and clamped by the homologous material variable-rigidity clamping pieces 20, the smaller end of each homologous material variable-rigidity clamping piece 20 is inserted into the anchor hole, and the larger end of each homologous material variable-rigidity clamping piece 20 is embedded into the groove in the limiting plate 17.

Referring to fig. 6, the variable-stiffness wrapping sheet 19 made of the same material comprises two semicircular clip gripping sheets which are detachably connected, and the clip gripping sheets comprise a nylon layer 19a, a basalt fiber layer 19b and a carbon fiber layer 19c from inside to outside. The two ends of the carbon fiber layer 19c extend outwards to form extension pieces 19d respectively, a plurality of clamping through holes are formed in the extension pieces 19d, and the clamping through holes on the two hoop holding pieces wrapping the same basalt fiber bar 2 correspond to one another. Each clamping screw 22 penetrates through two corresponding clamping through holes on the two hoop holding sheets from one side, and each clamping nut 21 is in threaded connection with the clamping screw 22 on the other side, so that the two hoop holding sheets clamp the basalt fiber bars 2.

The rigidity of the variable-rigidity wrapping sheet 19 made of the homologous material is gradually increased from inside to outside, so that deformation coordination between the variable-rigidity wrapping sheet 19 made of the homologous material and the basalt fiber bar 2 during wrapping is guaranteed, and the basalt fiber bar 2 is prevented from being damaged in the tensioning process. The inner surface of the nylon layer 19a is subjected to rough treatment, so that the static friction coefficient between the basalt fiber rib 2 and the nylon layer 19a is ensured to be large enough, sufficient static friction force can be generated between the basalt fiber rib and the nylon layer, and the phenomenon that the variable-rigidity gripping sheet 19 made of the homologous material slides with the basalt fiber rib 2 is avoided.

Referring to fig. 1, 2, 3 and 4, in addition, an embodiment of the present invention further provides a method for accurately grouting a tensile basalt fiber anchor cable in a segmented manner, where the method for accurately grouting a tensile basalt fiber anchor cable in a segmented manner includes the following steps:

s1, acquiring full borehole images of the inner wall of the anchoring borehole by using an underground television, analyzing the development condition of the rock body joint crack 10 in the anchoring borehole, further determining the number, the length and the specific position of the sections 6 to be grouted, and simultaneously determining the installation position of the second base plate 9.

Specifically, dividing a drilling section, in which a 30cm continuous irrational crack 10 develops, on the wall of a drilling hole into sections to be grouted 6 (anchoring sections) according to an acquired 360-degree full drilling image of the inner wall of the anchoring drilling hole, determining the total length of the anchoring sections, calculating the number of anchoring agents (cement) required by the corresponding total length of the anchoring sections according to design requirements, and determining the installation position of a second backing plate 9 according to the position of the uppermost section to be grouted 6; if the maximum value of the label of the anchoring agent (cement) still cannot meet the anchoring requirement, continuously drilling the anchoring borehole by using the original drill bit, acquiring an inner wall 360-degree borehole image of a newly drilled section in the anchoring borehole by using an underground television, determining the total length of the anchoring section by combining the newly acquired inner wall borehole image and the original inner wall borehole image, calculating the label of the anchoring agent (cement) required by the total length of the anchoring section, and determining the installation position of a second backing plate 9 according to the position of the uppermost section to be grouted 6;

s2, respectively installing a first base plate 1 and a second base plate 9 at the upper end and the lower end of each section to be grouted 6 corresponding to the valve pipe 3, and enabling the basalt fiber ribs 2 to penetrate through all the first base plates 1 and the second base plates 9; and (3) putting the basalt fiber ribs 2 and the valve pipe 3 into the anchoring drill hole.

Specifically, the number and the diameter of 2 basalt fiber ribs are determined according to the designed value of the anchoring force of the basalt fiber anchor cable in the anchoring drill hole, the length of each basalt fiber rib 2 is determined by combining the depth of the anchoring drill hole, the corresponding number of basalt fiber ribs 2 with the corresponding length are intercepted and used as the raw material of the anchor cable, a first base plate 1 and a second base plate 9 matched with the number and the diameter of the basalt fiber ribs 2 are selected, and in addition, a fixing rod 14 is designed and manufactured according to the length of each section to be grouted 6.

And determining the mounting positions of the two first base plates 1 corresponding to each section 6 to be grouted on the basalt fiber ribs 2 according to the distribution positions of the sections 6 to be grouted, and marking. In addition, the mounting position of the second mat 9 is marked. And pouring the prefabricated high-strength concrete hole plug 7, and pouring the main body of the outer grouting pipe 8 inside the prefabricated high-strength concrete hole plug 7 and through the upper end and the lower end of the prefabricated high-strength concrete hole plug 7. And the first base plate 1 is arranged on the valve pipe 3 and at the position of each section 6 to be grouted.

After all the first base plates 1 are installed, enabling all the basalt fiber bars 2 to respectively penetrate through all the first base plates 1, enabling marks on the basalt fiber bars 2 to correspond to all the first base plates 1 one by one, and then installing the second base plates 9 to a designed position to form a complete basalt fiber anchor cable;

and lowering the assembled basalt fiber anchor cable into the anchoring drill hole.

S3, inserting the grouting core pipe 4 into the bottom of the valve pipe 3, moving the grouting core pipe 4 upwards, controlling the grouting core pipe 4 to spray high-strength cement mortar from each grout outlet 12 when two sealing grout stop plugs 11 of the grouting core pipe 4 move to a first section to be grouted 6, increasing the pressure between the grouting core pipe 4 and the valve pipe 3, curling the upper end and the lower end of the elastic leather sheath 5 towards the middle part, further spraying the high-strength cement mortar from each grouting outlet 13 to be injected between the valve pipe 3 and the anchoring drill hole until the high-strength cement mortar is filled in a gap between the grouting section drill hole and the two first backing plates and the valve pipe, stopping grouting, lifting the grouting core pipe to a next section to be grouted, and repeating grouting operation until subsection grouting is completed.

Specifically, when two sealing grout stop plugs 11 of the grouting core pipe 4 move to one section 6 to be grouted, all grout outlets 12 are ensured to be positioned between two first base plates 1 of the section 6 to be grouted. Pumping high-strength cement mortar into the grouting core pipe 4 at a certain pressure, filling the gap between the valve pipe 3 and the grouting core pipe 4 with high-strength cement mortar slurry, extruding the elastic leather sheath 5 under the action of the pressure, continuously injecting the high-strength cement mortar into the gap between the anchoring drill hole and the valve pipe 3 through the grouting opening 13 until the high-pressure cement mortar cannot be pumped, stopping grouting, and lifting the grouting core pipe 4 to the next section 6 to be grouted.

Repeating the steps until all the sections to be grouted 6 in the anchoring drill holes are grouted, taking out the grouting core pipe 4, pouring high-strength cement mortar into the valve pipe 3 until the high-strength cement mortar is poured to the orifice of the valve pipe 3, and finishing the pipe sealing treatment of the valve pipe 3;

s4, when the strength of high-strength cement mortar at an anchoring section in an anchoring drill hole reaches a tensile strength, sleeving a prefabricated high-strength concrete hole plug 7, installing a reaction frame 15 outside the anchoring drill hole, enabling all basalt fiber ribs 2 of the basalt fiber anchor rope to penetrate through the reaction frame 15, sequentially installing an anchor ring 16, a limiting plate 17 and a penetrating jack 18 at the upper end of the reaction frame 15, enabling all basalt fiber ribs 2 to penetrate through the anchor ring 16, the limiting plate 17 and the penetrating jack 18, installing homologous material variable-rigidity clamping pieces 20 in anchor holes on the anchor ring 16, and clamping all basalt fiber ribs 2;

selecting homologous material variable-rigidity wrapping sheets 19 with different wrapping lengths according to designed values of anchoring force of the basalt fiber anchor cable, mounting the homologous material variable-rigidity wrapping sheets 19 on each basalt fiber bar 2, clamping the wrapped basalt fiber bar 2 by the homologous material variable-rigidity wrapping sheets 19, and abutting the bottom of the homologous material variable-rigidity wrapping sheets 19 against the upper end of the piercing jack 18;

s5, starting the center-penetrating jack 18, integrally tensioning the basalt fiber bars 2, when the anchoring force is designed, injecting early-strength micro-expansion cement mortar into a gap between the prefabricated high-strength concrete hole plug 7 and the second backing plate 9 through the outer grouting pipe 8, and stopping grouting until the cement mortar is observed to be full of gaps among the basalt fiber bars 2, the valve pipe 3 and the prefabricated high-strength concrete hole plug 7;

s6, when the early strength micro-expansion cement mortar reaches the target strength, locking each basalt fiber rib 2 at the anchor head by the prefabricated high strength concrete hole plug 7, closing the penetrating jack 18, cutting off each basalt fiber rib 2 along the upper surface of the prefabricated high strength concrete hole plug 7, disassembling the tensioning device, and completing construction of the tensile basalt fiber anchor cable.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.