CN112252339A - Upward full-length bonding anchor cable hole subsection grout stopping structure and method - Google Patents
Upward full-length bonding anchor cable hole subsection grout stopping structure and method Download PDFInfo
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- CN112252339A CN112252339A CN202010985248.3A CN202010985248A CN112252339A CN 112252339 A CN112252339 A CN 112252339A CN 202010985248 A CN202010985248 A CN 202010985248A CN 112252339 A CN112252339 A CN 112252339A
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- grouting
- pipe
- grout stopping
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- grout
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
Abstract
The invention discloses an upward-type full-length bonding anchor cable hole internal segmented grout stopping structure which comprises a grout stopping bag grouting pipe, an anchoring section exhaust pipe, a free section grouting pipe, a free section exhaust pipe, a grout stopping bag and a grout stopping plug, wherein the grout stopping bag grouting pipe, the anchoring section exhaust pipe, the free section grouting pipe, the free section exhaust pipe, the grout stopping bag and an anchor cable are woven into a whole and are placed into the upward-type anchor cable hole along with the anchor cable when the anchor cable is anchored, the upward-type anchor cable hole can be divided into an anchoring section and a free section after the grout stopping bag is grouted and expanded, the pipe bottom of the grout stopping bag grouting pipe extends into the grout stopping bag, the pipe bottoms of the anchoring section grouting pipe and the anchoring section exhaust pipe extend into the anchoring section, and the pipe bottoms of. Meanwhile, the invention also provides an upward full-length bonding anchor cable hole subsection grout stopping method. And forming effective grout stop between the anchoring section and the free section by utilizing the grout stop bag, grouting the anchoring section, tensioning after grout at the anchoring end reaches the tensile strength, and grouting and sealing the free section at the opening part to quickly form the anchoring effect of the anchor cable.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a grout stopping structure and a grout stopping method for an upward anchor cable hole.
Background
At present, the anchoring and grouting support technology is widely adopted at home and abroad to reinforce geotechnical engineering such as mine roadways, tunnels, side slopes and the like. In construction, the anchor cable is generally subjected to hole sealing and grouting by adopting a hollow conical rubber plug or winding veil, hemp ropes and the like. The hole sealing mode is very effective under the conditions of good drilling formation and flat rock stratum surface, but has poor hole sealing effect on soft and broken rock stratum. When the crack of the orifice is large, even if the orifice is sealed, the grout can still leak out through the crack of the orifice during grouting, the grout can not be effectively diffused into the rock stratum through the drill hole, the grout can not be ensured to fill the drill hole, reinforce the surrounding rock, realize full-length anchoring, and reduce the grouting effect.
In order to ensure the grouting effect, the surface sealing is carried out by adopting sprayed concrete under the common condition, the treatment method not only increases the cost and the workload, but also reduces the construction speed. In order to solve the above problems, there is also a method of sealing holes in a drilled hole, which mainly includes two ways:
firstly, the hole packer is made of high polymer water-swelling material, such as water-swelling rubber, swelling water-tight soil and the like. The hole packer utilizes the drilling to spray water or inject water into the hole packer to enable the water-swelling material to expand to play a role in hole sealing and sealing. However, the high polymer material of the hole packer has long water absorption expansion time, and cannot realize immediate grouting after installation. And secondly, a hole grout stopping plug is adopted, and the hole grout stopping grouting anchor cable generally comprises a hollow anchor cable body, an anchor cable anchorage device, a tray, a hole grout stopping component, a rigid core pipe and the like. The slurry stopping assembly in the hole consists of an inner sleeve, an outer sleeve, a tightly hooped metal pipe, an elastic sleeve and a hard sleeve. The hole packer has a good effect on the surrounding rock crushing section near the orifice, but when the inside of a deep hole is plugged, the grouting stop sleeve is connected and shifted or falls off due to the fact that local rock bodies in the hole are crushed or small-particle rock debris exists, and the plugging effect is affected. Meanwhile, due to the combined action of the two parts of the in-hole grout stopping component of the grouting anchor cable, the gap between the anchor cable body and the hole wall and the gap between the steel wires of the anchor cable body are all tightly plugged, the purpose of grout stopping is achieved, the resistance between the anchor cable and the hole wall can be increased during deep hole installation, the installation accuracy and progress of the anchor cable are influenced, and repeated reaming installation is needed in some cases.
Disclosure of Invention
The invention aims to provide an upward-type full-length bonding anchor cable hole internal segment grout stopping structure which is suitable for upward-type anchor cable holes in narrow spaces, can effectively ensure the grout stopping effect of an anchor end of an anchor cable, and can perform grouting and tensioning of the anchor end after grouting of a grout stopping bag and then perform free end grouting and sealing.
Therefore, the technical scheme adopted by the invention is as follows: a method for preventing grouting in a hole of an upward-type full-length bonded anchor cable in sections comprises a grouting bag grouting pipe, an anchoring section exhaust pipe, a free section grouting pipe, a free section exhaust pipe, a grouting bag and a grouting stopper, wherein the grouting bag grouting pipe, the anchoring section exhaust pipe, the free section grouting pipe, the free section exhaust pipe, the grouting bag and the anchor cable are bundled into a whole and are placed into the upward-type anchor cable hole along with the anchor cable when the anchor cable is anchored, the upward-type anchor cable hole can be divided into an anchoring section and a free section after grouting expansion of the grouting bag, the grouting stopper tightly seals an orifice of the upward-type anchor cable hole, the bottom of the grouting bag grouting pipe extends into the grouting bag, the bottoms of the anchoring section grouting pipe and the anchoring section exhaust pipe extend into the anchoring section, the bottoms of the free section grouting pipe and the free section exhaust pipe extend into the free section, and the free section exhaust pipe is longer than the free section grouting pipe.
Preferably, the pipe bottom of the anchoring section grouting pipe penetrates through the grout stopping bag by 1m, the distance between the pipe bottom of the anchoring section exhaust pipe and the bottom of the anchor cable hole is not more than 50cm, the pipe bottom of the free section grouting pipe penetrates through the grout stopping plug, and the distance between the free section exhaust pipe and the grout stopping bag is 10-50 cm. The sizes of the positions of the bottom of the grouting pipe and the bottom of the exhaust pipe are optimized, and the grouting effect is further ensured.
Further preferably, the anchoring section exhaust pipe and the free section exhaust pipe are provided with notches on the side edges close to the pipe bottom, and auxiliary exhaust is performed through the notches when the pipe is accidentally blocked.
Meanwhile, the invention also provides an upward-type full-length bonding anchor cable hole subsection grout stopping method, which comprises the following steps:
firstly, finishing installation of No. 1-5 pipelines, a grout stopping bag and a grout stopping plug when an anchor rope is bundled, putting the pipelines, the grout stopping bag and the grout stopping plug into an upward anchor rope hole when anchoring, dividing the upward anchor rope hole into an anchoring section and a free section through the grout stopping bag, and tightly plugging an orifice of the upward anchor rope hole by using the grout stopping plug; no. 1-5 pipelines are respectively a grouting bag grouting pipe, an anchoring section exhaust pipe, a free section grouting pipe and a free section exhaust pipe; the tube bottom of the grouting tube of the grout stopping bag extends into the grout stopping bag, the tube bottoms of the grouting tube of the anchoring section and the exhaust tube of the anchoring section extend into the anchoring section, the exhaust tube of the anchoring section is longer than the grouting tube of the anchoring section, the tube bottoms of the grouting tube of the free section and the exhaust tube of the free section extend into the free section, and the exhaust tube of the free section is longer than the grouting tube of the free section;
secondly, grouting is carried out in the grout stopping bag through a grout stopping bag grouting pipe to enable the grout stopping bag to extrude the hole wall, and an effective grout stopping and hole sealing effect is formed in the hole;
thirdly, grouting the anchoring section when the grouting of the grout stopping bag is finished and the grout strength reaches more than 10MPa, grouting the anchoring section by using sulphoaluminate cement, grouting the anchoring section through a grouting pipe of the anchoring section, sealing the exposed section of the orifice of the exhaust pipe of the anchoring section after primary grout with the same concentration is discharged from the orifice of the exhaust pipe of the anchoring section, and performing pressurized grouting, and finishing grouting when the grouting pressure reaches 0.3-0.4MPa and the grout inlet rate is less than 11L/min;
fourthly, after grouting of the anchoring section is finished, the strength of grout reaches more than 40MPa, and free tensioning and locking of the anchor cable are carried out by utilizing the free section;
and fifthly, after the anchor cable is stretched freely, grouting to the free section through a free section grouting pipe and a free section exhaust pipe, sealing the exposed section of the orifice of the free section exhaust pipe after primary pulp with the same concentration emerges from the orifice of the free section exhaust pipe, performing pressurized grouting, and finishing grouting when the grouting pressure reaches 0.3-0.4MPa and the grouting rate is less than 11L/min.
Preferably, the grout stopping bag is made into a cylinder with two open ends by sewing permeable canvas lined with non-woven fabrics, before the grout stopping bag is bound, the non-woven fabrics are respectively wrapped on the anchor cable steel strand, the grout stopping bag grouting pipe, the anchoring section grouting pipe and the anchoring section exhaust pipe for two times, each time is wrapped for 7-9 circles, each time is 4-6 cm in width, and then an electrical insulating plastic adhesive tape is wrapped on two ends of the non-woven fabrics for 6-7 circles; when the grout stopping bag is bound, the grout stopping bag is turned outwards to the end of the tensioning section, the fine iron wire is used for binding two times in the middle of the non-woven fabric wrapping part, the pores of the wrapping part are filled with the non-woven fabric before binding, and then the grout stopping bag is turned over to bind the other end. The grout stopping bag is the most important component of the anchor cable, and the construction quality of the grout stopping bag is directly related to success or failure of anchor cable construction. The connecting and sealing effects are ensured by adjusting the sewing, wrapping and binding methods of the grout stopping bag; utilize the non-woven fabrics outsourcing wear-resistant material canvas that permeates water, can avoid causing when having the tiny particle piece owing to downthehole local rock mass is broken or to end the thick liquid bag breakage, shift or drop, influence shutoff effect, guarantee that the sack installation is accurate, not damaged, can effectively guarantee to end thick liquid effect.
More preferably, in the third step, after the grouting of the grout stopping bag is finished for 4 hours, the grout strength reaches 26.5MPa, and then the grouting of the anchoring section is carried out.
Preferably, the pipe bottom of the grouting pipe of the anchoring section penetrates through the grout stopping bag by 1m, the distance between the pipe bottom of the exhaust pipe of the anchoring section and the bottom of the anchor cable hole is not more than 50cm, the pipe bottom of the grouting pipe of the free section penetrates through the grout stopping plug, and the distance between the exhaust pipe of the free section and the grout stopping bag is 10-50 cm.
More preferably, the exposed ends of the pipe orifices of the No. 1-5 pipelines are wound with electrical tapes and numbered as marks.
The invention has the beneficial effects that: and forming effective grout stop between the anchoring section and the free section by utilizing the grout stop bag, grouting the anchoring section, tensioning after grout at the anchoring end reaches the tensile strength, and grouting and sealing the free section at the opening part to quickly form the anchoring effect of the anchor cable. The anchor cable has simple structure, convenient processing and manufacturing and low cost; the installation is convenient and fast, and the installation and hole sealing time is fast. The full-length bonding is realized through the subsection grouting in the anchor cable hole, and the anchor cable hole is particularly suitable for the construction of the upward-looking anchor cable hole in a narrow space.
Drawings
FIG. 1 shows a state in which grouting is performed into a grout stopping bag by using a grouting pipe (without an anchor cable).
Fig. 2 shows a state in which the grouting of the anchoring section is performed by using the grouting pipe of the anchoring section and the exhaust pipe of the anchoring section (without the anchor cable).
Fig. 3 shows a state in which the free section grouting is performed by using the free section grouting pipe and the free section exhaust pipe after the anchor section is tensioned (without the anchor cable).
Fig. 4 is a schematic structural view of an overhead full-length bonded cable bolt.
FIG. 5 is a schematic view of the installation of the grout stopping bag.
FIG. 6 is a cross-sectional view of the grout stopping bag before grouting and sealing.
FIG. 7 is a cross-sectional view of the grout stopping bag after grouting and sealing.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1-4, the upward full-length bonded anchor cable hole internal segmented grout stopping structure mainly comprises a grout stopping bag grouting pipe 1, an anchoring section grouting pipe 2, an anchoring section exhaust pipe 3, a free section grouting pipe 4, a free section exhaust pipe 5, a grout stopping bag 6, a grout stopping plug 7, an anchor cable 8 and the like.
The grouting pipe 1 of the grout stopping bag, the grouting pipe 2 of the anchoring section, the exhaust pipe 3 of the anchoring section, the grouting pipe 4 of the free section, the exhaust pipe 5 of the free section, the grout stopping bag 6, the grout stopping plug 7 and the anchor cable 8 are woven into a whole and are placed into the upward anchor cable hole along with the anchor cable 8 when being anchored. The cable bolt hole is gradually raised from the hole opening to the hole bottom, and is therefore called an "overhead cable bolt hole".
The upward anchor cable hole can be divided into an anchoring section and a free section after the grouting expansion of the grout stopping bag 6, and the grout stopping plug 7 closely blocks the orifice of the upward anchor cable hole. The tube bottom of the grouting tube 1 of the grouting bag extends into the grouting bag 6, the tube bottom of the grouting tube 2 of the anchoring section and the exhaust tube 3 of the anchoring section extend into the anchoring section, and the exhaust tube 3 of the anchoring section is longer than the grouting tube 2 of the anchoring section. The bottoms of the free section grouting pipe 4 and the free section exhaust pipe 5 extend into the free section, and the free section exhaust pipe 5 is longer than the free section grouting pipe 4.
Preferably, the length of the anchoring section grouting pipe 2 after penetrating through the grout stopping bag 6 is 1m, the distance between the pipe bottom of the anchoring section exhaust pipe 3 and the bottom of the anchor cable hole is not more than 50cm, the pipe bottom of the free section grouting pipe 4 penetrates through the grout stopping plug 7, and the distance between the free section exhaust pipe 5 and the grout stopping bag 6 is 10-50 cm.
In addition, the side edges of the anchored-section exhaust pipe 3 and the free-section exhaust pipe 5 close to the pipe bottom are preferably provided with notches (not shown in the figure), and auxiliary exhaust is performed through the notches when the pipe is accidentally blocked.
An upward-type full-length bonding anchor cable hole subsection grout stopping method comprises the following steps:
firstly, the No. 1-5 pipeline, the grout stopping bag 6 and the grout stopping plug 7 are installed when the anchor cable 8 is bundled, the anchor cable is placed into the upward-looking anchor cable hole when the anchor cable is laid down, the upward-looking anchor cable hole is divided into an anchoring section and a free section through the grout stopping bag 6, and the orifice of the upward-looking anchor cable hole is tightly plugged by the grout stopping plug 7. No. 1-5 pipelines are respectively a grouting bag grouting pipe 1, an anchoring section grouting pipe 2, an anchoring section exhaust pipe 3, a free section grouting pipe 4 and a free section exhaust pipe 5. The tube bottom of the grouting tube 1 of the grouting bag extends into the grouting bag 6, the tube bottoms of the anchoring section grouting tube 2 and the anchoring section exhaust tube 3 extend into the anchoring section, the anchoring section exhaust tube 3 is longer than the anchoring section grouting tube 2, the tube bottoms of the free section grouting tube 4 and the free section exhaust tube 5 extend into the free section, and the free section exhaust tube 5 is longer than the free section grouting tube 4.
And secondly, grouting into the grout stopping bag 6 through the grout stopping bag grouting pipe 1 to enable the grout stopping bag 6 to extrude the hole wall, and forming an effective grout stopping and hole sealing effect in the hole. When grouting, the grout fills the grout stopping bag under the action of grouting pressure to ensure that the grout stopping bag expands rapidly, the moisture of the grout in the bag is discharged rapidly through the cloth bag under the action of pressure, the density of the grout is increased rapidly until the density in the bag is compact, and the purpose of grout stopping is finally achieved. And (3) adopting common silicate cement for grouting by the grout stopping bag, and checking whether a grout stirring device and a grouting pump normally operate or not before grouting is started. And (4) according to the test, determining the mixing proportion to mix the cement slurry on site. The grout stopping bag is of a grout filling type structure, and the diameter of the grout stopping bag is slightly larger than the aperture of the anchor cable after expansion.
And thirdly, grouting the anchoring section when the grouting of the grout stopping bag 6 is finished and the strength of the grout reaches over 10 MPa. And (3) grouting the anchoring section by adopting sulphoaluminate cement through the anchoring section grouting pipe 2, sealing the exposed section of the orifice of the anchoring section exhaust pipe 3 for reinforcing the surrounding rock of the anchoring section after primary slurry with the same concentration emerges from the orifice of the anchoring section exhaust pipe 3 to ensure the anchoring effect, and performing pressurized grouting, wherein grouting is finished when the grouting pressure reaches 0.3-0.4MPa and the slurry inlet rate is less than 11L/min.
Preferably, in the third step, after the grouting of the grout stopping bag 6 is finished for 4 hours, the grout strength reaches 26.5MPa, and then the grouting of the anchoring section is carried out.
And fourthly, finishing grouting of the anchoring section, and then utilizing the free section to freely stretch and lock the anchor cable 8 when the slurry strength reaches more than 40 MPa. Because the free section steel strand is not grouted and anchored, the free section steel strand can be freely tensioned.
And fifthly, after the anchor cable 8 is stretched freely, grouting to the free section through the free section grouting pipe 4 and the free section exhaust pipe 5, sealing the exposed section of the orifice of the free section exhaust pipe 5 and performing pressurized grouting after primary pulp with the same concentration emerges from the orifice of the free section exhaust pipe 5, and finishing grouting when the grouting pressure reaches 0.3-0.4MPa and the grouting rate is less than 11L/min. The free section grouting adopts ordinary portland cement.
As shown in fig. 5-7, the grout stopping bag 6 is made of a water permeable canvas lined with a non-woven fabric and sewn into a cylindrical shape with two open ends. Before binding the grout stopping bag 6, wrapping two non-woven fabrics on the anchor cable steel strand, the grout stopping bag grouting pipe 1, the anchoring section grouting pipe 2 and the anchoring section exhaust pipe 3 respectively, wrapping 7-9 circles of each non-woven fabric, wrapping 4-6 cm of each non-woven fabric in width, and wrapping 6-7 circles of non-woven fabrics at two ends by using electrical insulating plastic adhesive tapes; when the grout stopping bag is bound, the grout stopping bag 6 is turned outwards to the end of the tensioning section, the fine iron wire is used for binding two times in the middle of the non-woven fabric wrapping part, the pores of the wrapping part are filled with the non-woven fabric before binding, and then the grout stopping bag 6 is turned over to bind the other end.
The exposed end of the pipe orifice of the No. 1-5 pipeline is wound with an electrical tape and numbered as a mark.
The invention utilizes the grout stopping bag arranged between the anchoring section and the free section, firstly carries out grouting sealing on the grout stopping bag to ensure that the anchoring end and the free end form two independent spaces, then carries out grouting on the anchoring end, can stretch after grout at the anchoring end reaches the stretching strength, and then carries out grouting sealing on the free section to ensure that the anchor cable can quickly form the anchoring effect.
Claims (9)
1. The utility model provides an downthehole segmentation of formula of raising upwards full length bonding anchor rope ends thick liquid structure which characterized in that: comprises a grout stopping bag grouting pipe (1), an anchoring section grouting pipe (2), an anchoring section exhaust pipe (3), a free section grouting pipe (4), a free section exhaust pipe (5), a grout stopping bag (6) and a grout stopping plug (7), wherein the grout stopping bag exhaust pipe and an anchor rope (8) are woven into a whole and are placed into an upward anchor rope hole along with the anchor rope (8) when the anchor rope is anchored, the upward anchor rope hole can be divided into an anchoring section and a free section after the grouting expansion of the grout stopping bag (6), the grout stopping plug (7) tightly plugs the orifice of the upward anchor rope hole, the bottom of the grout stopping bag grouting pipe (1) extends into the grout stopping bag (6), the bottoms of the anchoring section grouting pipe (2) and the anchoring section exhaust pipe (3) extend into the anchoring section, the anchoring section exhaust pipe (3) is longer than the anchoring section grouting pipe (2), and the bottoms of the free section grouting pipe (4) and the free section exhaust pipe (5) extend into the free section, and the free section exhaust pipe (5) is longer than the free section grouting pipe (4).
2. The upward full-length bonding anchor cable hole subsection grout stopping structure as claimed in claim 1, wherein: the pipe bottom of the anchoring section grouting pipe (2) penetrates out of the grout stopping bag (6) by 1m, the distance between the pipe bottom of the anchoring section exhaust pipe (3) and the bottom of the anchor cable hole is not more than 50cm, the pipe bottom of the free section grouting pipe (4) penetrates out of the grout stopping plug (7), and the distance between the free section exhaust pipe (5) and the grout stopping bag (6) is 10-50 cm.
3. The upward full-length bonding anchor cable hole subsection grout stopping structure as claimed in claim 1, wherein: the side edges of the anchoring section exhaust pipe (3) and the free section exhaust pipe (5) close to the pipe bottom are provided with notches, and auxiliary exhaust is performed through the notches when the pipe is accidentally blocked.
4. An upward-type full-length bonding anchor cable hole subsection grout stopping method is characterized by comprising the following steps:
firstly, finishing installation of No. 1-5 pipelines, a grout stopping bag (6) and a grout stopping plug (7) when an anchor rope (8) is bundled, putting the anchor rope into an upward-type anchor rope hole when anchoring, dividing the upward-type anchor rope hole into an anchoring section and a free section through the grout stopping bag (6), and tightly plugging an orifice of the upward-type anchor rope hole by using the grout stopping plug (7); no. 1-5 pipelines are respectively a grouting bag grouting pipe (1), an anchoring section grouting pipe (2), an anchoring section exhaust pipe (3), a free section grouting pipe (4) and a free section exhaust pipe (5); the tube bottom of the grout stopping bag grouting tube (1) extends into the grout stopping bag (6), the tube bottoms of the anchoring section grouting tube (2) and the anchoring section exhaust tube (3) extend into the anchoring section, the anchoring section exhaust tube (3) is longer than the anchoring section grouting tube (2), the tube bottoms of the free section grouting tube (4) and the free section exhaust tube (5) extend into the free section, and the free section exhaust tube (5) is longer than the free section grouting tube (4);
secondly, grouting is carried out in the grout stopping bag (6) through the grout stopping bag grouting pipe (1) so that the grout stopping bag (6) extrudes the hole wall, and an effective grout stopping and hole sealing effect is formed in the hole;
thirdly, grouting the anchoring section when grouting of the grout stopping bag (6) is finished and the grout strength reaches more than 10MPa, grouting the anchoring section by adopting sulphoaluminate cement, grouting the anchoring section through the anchoring section grouting pipe (2), sealing the exposed section of the orifice of the anchoring section exhaust pipe (3) and performing pressurized grouting when primary grout with the same concentration flows out of the orifice of the anchoring section exhaust pipe (3), and finishing grouting when the grouting pressure reaches 0.3-0.4MPa and the grout inlet rate is less than 11L/min;
fourthly, after grouting of the anchoring section is finished, the strength of grout reaches more than 40MPa, and free tensioning and locking of the anchor cable (8) are carried out by utilizing the free section;
and fifthly, after the anchor cable (8) is stretched freely, grouting is carried out on the free section through the free section grouting pipe (4) and the free section exhaust pipe (5), when primary slurry with the same concentration is emitted from the orifice of the free section exhaust pipe (5), the exposed orifice section of the free section exhaust pipe (5) is sealed and pressurized grouting is carried out, and grouting is finished when the grouting pressure reaches 0.3-0.4MPa and the grouting rate is less than 11L/min.
5. The upward full-length bonding anchor cable hole subsection grout stopping method according to claim 4, characterized in that: the grout stopping bag (6) is made into a cylinder shape with two open ends by sewing permeable canvas lined with non-woven fabrics, before the grout stopping bag (6) is bound, the non-woven fabrics are respectively wrapped on the anchor cable steel strand, the grout stopping bag grouting pipe (1), the anchoring section grouting pipe (2) and the anchoring section exhaust pipe (3) for two times, each time is wrapped for 7-9 circles, each time is 4-6 cm in width, and then an electrical insulating plastic adhesive tape is used for wrapping 6-7 circles at two ends of the non-woven fabrics; when the grout stopping bag is bound, the grout stopping bag (6) is turned outwards to the end of the tensioning section, a fine iron wire is used for binding two times in the middle of the non-woven fabric wrapping part, the pore of the wrapping part is filled with the non-woven fabric before binding, and then the grout stopping bag (6) is turned over to bind the other end.
6. The upward full-length bonding anchor cable hole subsection grout stopping method according to claim 4, characterized in that: in the third step, after grouting of the grout stopping bag (6) is finished for 4 hours, the strength of the grout reaches 26.5MPa, and then grouting of the anchoring section is carried out.
7. The upward full-length bonding anchor cable hole subsection grout stopping method according to claim 4, characterized in that: the pipe bottom of the anchoring section grouting pipe (2) penetrates out of the grout stopping bag (6) by 1m, the distance between the pipe bottom of the anchoring section exhaust pipe (3) and the bottom of the anchor cable hole is not more than 50cm, the pipe bottom of the free section grouting pipe (4) penetrates out of the grout stopping plug (7), and the distance between the free section exhaust pipe (5) and the grout stopping bag (6) is 10-50 cm.
8. The upward full-length bonding anchor cable hole subsection grout stopping method according to claim 4, characterized in that: and the exposed ends of the pipe orifices of the No. 1-5 pipelines are wound with electrical tapes and numbered as marks.
9. The upward full-length bonding anchor cable hole subsection grout stopping method according to claim 4, characterized in that: the side edges of the anchoring section exhaust pipe (3) and the free section exhaust pipe (5) close to the pipe bottom are provided with notches, and auxiliary exhaust is performed through the notches when the pipe is accidentally blocked.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985248.3A CN112252339A (en) | 2020-09-18 | 2020-09-18 | Upward full-length bonding anchor cable hole subsection grout stopping structure and method |
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| CN202010985248.3A CN112252339A (en) | 2020-09-18 | 2020-09-18 | Upward full-length bonding anchor cable hole subsection grout stopping structure and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114657984A (en) * | 2022-04-22 | 2022-06-24 | 东华理工大学 | Segmental grouting anchoring method for joint development high and steep rocky slope |
| CN115142447A (en) * | 2022-09-06 | 2022-10-04 | 山东孟子居生态农业股份有限公司 | Slope reinforcement system and method with shock absorption and energy dissipation functions |
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2020
- 2020-09-18 CN CN202010985248.3A patent/CN112252339A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114657984A (en) * | 2022-04-22 | 2022-06-24 | 东华理工大学 | Segmental grouting anchoring method for joint development high and steep rocky slope |
| CN115142447A (en) * | 2022-09-06 | 2022-10-04 | 山东孟子居生态农业股份有限公司 | Slope reinforcement system and method with shock absorption and energy dissipation functions |
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