CN108979689B - Anchor cable structure capable of secondary grouting, tunnel surrounding rock anchoring structure and construction method - Google Patents
Anchor cable structure capable of secondary grouting, tunnel surrounding rock anchoring structure and construction method Download PDFInfo
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- CN108979689B CN108979689B CN201810956831.4A CN201810956831A CN108979689B CN 108979689 B CN108979689 B CN 108979689B CN 201810956831 A CN201810956831 A CN 201810956831A CN 108979689 B CN108979689 B CN 108979689B
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- 239000011435 rock Substances 0.000 title claims abstract description 42
- 238000004873 anchoring Methods 0.000 title abstract description 15
- 238000010276 construction Methods 0.000 title description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims description 17
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000007569 slipcasting Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an anchor cable structure capable of secondary grouting, which comprises: at least one anchor cable steel strand arranged in the borehole; a primary grouting pipe extending into the drill hole for primary grouting of surrounding rock in the drill hole at a distance of 1-3m from the drill hole orifice to form a primary grouting part for closing the drill hole orifice; the secondary grouting pipe extends into the drill hole and is used for carrying out secondary grouting on other areas which are not subjected to primary grouting in the drill hole; and the guide piece is arranged in the drilling hole and used for allowing the anchor cable steel strand to pass through so as to guide the anchor cable steel strand into the drilling hole. The method can effectively increase the bond strength and the anchoring force between the steel stranded wires and the grouting body, and simultaneously improve the grouting pressure of secondary grouting in a mode of secondary grouting, so that the cohesive force between the anchor rope grouting body and surrounding rock is improved, slipping of the anchor rope during drawing is prevented, and the prestress level of the anchor rope is improved.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to an anchor cable structure, a tunnel surrounding rock anchoring structure and a construction method thereof.
Background
The anchoring process of tunnel vault mostly includes upwards punching and the process of slip casting, because gravity effect, the phenomenon of downward thick liquid leakage easily appears in the slip casting process, lead to the slip casting effect poor, simultaneously, the cohesive force between anchor rope slip casting body and the country rock is less, especially in weak country rock, the cohesive force between slip casting body and the country rock is difficult to satisfy the requirement of the high prestressing force of anchor rope, further, because rust-proof oil on the cable strand surface is difficult to clear up when the site construction, consequently lead to the bond between steel strand and the slip casting body to reduce by a wide margin, thereby the prestressing force anchor rope is in the stretch-draw phenomenon of steel strand and anchor section slip casting body appears often, lead to the prestressing force to not reach the designing requirement, and current solution mainly is the slip casting body length of extension anchor section, thereby increase the bond between steel strand and the slip casting body, prevent both, but this kind of mode has increased slip casting body length and has led to the construction cost too high.
In addition, in the prior art, the strength of the grouting body before the anchor cable is tensioned needs to be more than 30Mpa, and the setting time of the cement mortar grouting body to be 30Mpa is minimum to be 20 days, so that the whole anchor cable construction needs about one month from drilling, anchor cable installation, grouting, slurry consolidation and anchor cable tensioning. For a large-span weak surrounding rock tunnel, the self-stabilization time is short, and the quick tensioning anchor cable is urgently needed, so that the anchor cable structure capable of providing prestress for the surrounding rock of the tunnel in a short time is provided.
Disclosure of Invention
The invention provides an anchor cable structure capable of carrying out secondary grouting, a tunnel surrounding rock anchoring structure and a construction method thereof, which aim at the defects of the prior art, can effectively increase the bond strength and the anchoring force between a steel strand and a grouting body, simultaneously improve the cohesive force between the anchor cable grouting body and the surrounding rock in a way of secondary grouting, prevent the anchor cable from slipping when being pulled, improve the prestress level of the anchor cable and greatly shorten the consolidation time of the grouting body.
The technical scheme adopted for solving the technical problems is as follows:
in one aspect, there is provided a secondary grouting anchor cable structure comprising: at least one anchor cable steel strand arranged in the borehole;
a primary grouting pipe extending into the drill hole for primary grouting of surrounding rock in the drill hole at a distance of 1-3m from the drill hole orifice to form a primary grouting part for closing the drill hole orifice;
the secondary grouting pipe extends into the drill hole and is used for carrying out secondary grouting on other areas which are not subjected to primary grouting in the drill hole;
the guide piece is arranged in the drilling hole and used for allowing the anchor cable steel strand to pass through, so that the anchor cable steel strand is guided into the drilling hole;
and at least one binding element for binding the anchor cable steel strands extending into the borehole.
Preferably, the anchor cable structure further comprises anchor cable barbs sleeved on at least one anchor cable steel twisted wire; the anchor cable barb includes:
an external anchor ring, wherein a through hole with a trapezoid longitudinal section for the anchor cable steel strand to pass through is formed in the external anchor ring;
and at least one clamping piece, which is used for wedging one end of the anchor cable steel strand into a gap between the anchor cable steel strand and the inner wall of the perforation when the anchor cable steel strand passes through the perforation, and the other end of the clamping piece extends out of the outer anchor ring.
Preferably, the anchor cable structure capable of secondary grouting further comprises: at least one spacer, it sets up in inside the drilling, include:
the first through hole is arranged in the center of the isolation frame;
a plurality of second through holes uniformly spaced around the first through hole; the first through hole and/or the second through hole are/is used for the anchor cable steel strand to pass through;
at least one vent hole and at least one grouting hole; the vent hole is used for allowing a gas supply source to enter when primary grouting/secondary grouting is carried out in the drill hole so as to adjust the gas pressure in the drill hole; the grouting holes are used for allowing the primary grouting pipe/secondary grouting pipe to pass through so as to perform primary grouting/secondary grouting on the inside of the drilling hole.
Preferably, the anchor cable structure capable of secondary grouting further comprises: a steel pad pier disposed in the bore distal to one end of the guide and in communication with the bore, comprising: an upper backing plate; a lower backing plate arranged opposite to the upper backing plate; a connecting member for connecting the upper pad and the lower pad; and the reinforcing ribs are arranged between the upper backing plate and the lower backing plate and surround the connecting piece.
Preferably, the connecting piece is provided with at least two grouting pipe inlet and outlet holes; a third through hole communicated with the drilling hole is formed in the center of the lower base plate; the primary grouting pipe penetrates through a grouting pipe inlet and outlet hole, a third through hole and a grouting hole of the isolation frame and then stretches into the drill hole to perform primary grouting, and the secondary grouting pipe penetrates through a grouting pipe inlet and outlet hole, the third through hole and a grouting hole of the isolation frame and then stretches into the drill hole to perform secondary grouting.
Preferably, the anchor cable structure capable of secondary grouting further comprises: and one end of the connecting pipe is connected with the third through hole, and the other end of the connecting pipe stretches into the drilling hole and is used for the grouting pipe to pass through.
Preferably, the method comprises the steps of: a borehole formed in a surrounding rock of a tunnel, the anchor cable structure of claim 6, and a grid steel frame buried in the surrounding rock; the anchor cable steel strand, the primary grouting pipe, the secondary grouting pipe and the guide piece extend into the drill hole;
the grid steel frame comprises: the filling piece is arranged between the inner steel frame piece and the outer steel frame piece.
Preferably, the filler includes: a "-infinity" type and/or an "X" type and/or a "Z" type.
On the other hand, the construction method of the tunnel surrounding rock anchoring structure is also provided, and comprises the following steps:
s1, at least one drilling hole is formed in surrounding rock of a tunnel;
s2, fixing the steel pad pier on the inner wall surface of the tunnel, and arranging a separation frame and a guide piece in the drilled hole;
s3, one end of the anchor cable steel strand penetrates through the guide piece and the isolation frame and then stretches into the drilled hole, and the primary grouting pipe and the secondary grouting pipe penetrate through the grouting pipe inlet and outlet hole, the third through hole and a grouting hole of the isolation frame and then stretch into the drilled hole;
s4, burying the grid steel frame in the surrounding rock, and performing primary grouting on the surrounding rock at a position 1-3m away from the drilling hole opening in the drilling hole through a primary grouting pipe so as to form a primary grouting part for sealing the drilling hole opening; and after the strength of the primary grouting part is greater than 20Mpa, performing secondary grouting on other areas which are not subjected to primary grouting in the drill hole through the secondary grouting pipe.
Preferably, in the step S1, drilling holes are formed by adopting an HT150 type mining down-the-hole drill; in step S4, the grouting slurry of the primary grouting and/or the secondary grouting comprises sulphoaluminate cement
The technical scheme of the invention has the beneficial effects that:
the anchor cable structure is sleeved on the anchor cable steel strand through the anchor cable barb, so that the bond force and the anchoring force between the steel strand and the grouting body can be effectively increased, the slipping phenomenon of the steel strand and the grouting body at the anchoring section can be prevented without increasing the length of the grouting body, meanwhile, the grouting is carried out on the drill holes in a split grouting mode, the grouting pressure of secondary grouting can be greatly improved, the cohesive force between the anchor cable grouting body and surrounding rock is improved, the grouting effect is improved, particularly, the anchor cable structure has a good reinforcing effect on weak surrounding rock, the slipping during the drawing of the anchor cable can be prevented, and the prestress level of the anchor cable is improved; in addition, the invention can greatly shorten the consolidation time of the grouting body, so that the anchor cable construction can be completed within 15 hours, and a fast tensioning anchor cable supporting structure is provided for the weak surrounding rock large-span tunnel with shorter self-stabilization time.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is an overall construction view of an anchor line structure in accordance with a first embodiment of the present invention;
FIG. 2 is a schematic view of an anchor rope structure anchoring a surrounding rock in accordance with an embodiment of the present invention;
figure 3 is a schematic longitudinal cross-sectional view of an anchor line barb in accordance with one embodiment of the present invention;
FIG. 4 is a schematic longitudinal cross-sectional view of a guide in accordance with a first embodiment of the invention;
FIG. 5 is a cross-sectional view of an isolator rack in accordance with a first embodiment of the present invention;
FIG. 6 is a cross-sectional view of a steel pad pier in accordance with an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a steel pad pier in accordance with an embodiment of the present invention;
fig. 8 is a schematic view of a partial structure of a grid steel frame according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
fig. 1-2 illustrate an anchor line structure of the present invention comprising: at least one anchor line steel strand 1 disposed within borehole 100;
the anchor cable barbs 2 are sleeved on at least one anchor cable steel strand 1 and are used for enhancing the bond between the anchor cable steel strand 1 and the grouting body when the grouting body is formed by grouting into the drill hole 100, and preferably, in the embodiment, each anchor cable steel strand 1 is uniformly provided with a plurality of anchor cable barbs 2 at intervals;
a primary grouting pipe 6 with the length of 1-3m, which extends into the drill hole 100 and is used for primary grouting of tunnel surrounding rock in the drill hole 100 at a position 1-3m away from the drill hole orifice so as to form a primary grouting part S1 for closing the drill hole orifice;
a secondary grouting pipe 7 extending into the borehole for secondarily grouting other areas of the borehole where the primary grouting is not performed, so as to form a secondary grouting portion S2 on the primary grouting portion S1;
and a guide 3 disposed in one end of the borehole 100 for the passage of the cable wire 1, thereby guiding the cable wire 1 into the borehole 100.
As shown in fig. 3, the anchor cable barb 2 includes: an outer anchor ring 21, and an inner portion of the outer anchor ring is provided with a through hole 22 which can be penetrated by the anchor cable steel strand 1 and has a trapezoid longitudinal section, preferably, the through hole 22 has an isosceles trapezoid longitudinal section, and the cone angle theta of the through hole is 8-12 degrees (preferably 10 degrees);
and at least one clip 23 for wedging one end of the cable wire 1 into a gap between the cable wire 1 and an inner wall of the through hole 22 when the cable wire 1 passes through the through hole 22, and the other end protruding from the outer anchor ring 21; in this embodiment, the clamping pieces 23 are formed by at least 2 and can be integrally formed into a complete round table structure, and are in interference fit with gaps between the anchor cable steel strand 1 and the inner wall of the through hole 22, so that the anchor cable steel strand 1 and the anchor cable barb 2 form a firm integral structure, when the secondary grouting body S2 is formed by grouting into the drill hole 100, two ends of the outer anchor ring 21 and a part of the clamping pieces 23 extending out of the outer anchor ring 21 form a barb structure to be wedged into the grouting body, so that the bond between the surface of the anchor cable steel strand 1 and the grouting body is enhanced, and the anchor cable steel strand 1 is prevented from slipping from the grouting body;
as shown in fig. 4, the guide 3 includes: a cylindrical portion 31, and a truncated cone portion 32 connected to the cylindrical portion 31 and coaxially provided; and a cylindrical extension 33 connected to the truncated cone 32 and coaxially provided; wherein the inner diameter D of the cylindrical part is 100-120mm (preferably 110 mm), and the height H1 is 90-110mm (preferably 100 mm); the cone angle theta 1 of the truncated cone portion 32 is 75 to 85 degrees (preferably 80 degrees), and the height H2 is 45 to 55mm (preferably 50 mm); the cylindrical extension 33 has an inner diameter of 15-25mm (preferably 21 mm) and a height H3 of 10-20mm (preferably 15 mm).
In addition, as shown in fig. 1 and 5, the anchor cable structure capable of secondary grouting further comprises: at least one circular spacer 4 (preferably made of rubber with a thickness of 50 mm) provided inside said borehole 300 for passing at least one of said anchor line strands 1; when a plurality of isolation frames 4 are arranged, the isolation frames are uniformly arranged in the drilling holes 100 at intervals so as to ensure uniform stress; and at least one binding member 8 for binding the anchor cable strands 1 passing through the spacer frame to prevent unordered dispersion thereof so that grouting is uniform;
specifically, the isolation frame 4 includes:
a first through hole 41 provided at the center of the separator 4;
a plurality of second through holes 42 uniformly spaced around the first through hole 41; the first through hole 41 and/or the second through hole 42 are/is used for the anchor cable steel strand 1 to pass through; in this embodiment, the total number of the first through holes 41 and the second through holes 42 corresponds to the number of the anchor cable steel strands 1, and one anchor cable steel strand 1 is correspondingly threaded in each of the first through holes 41 and the second through holes 42;
at least one vent hole 43 and at least one grouting hole 44; the vent hole 43 is used for allowing a gas supply source to enter during primary grouting/secondary grouting of the inside of the drill hole 100 so as to adjust the gas pressure inside the drill hole 100; the grouting holes 44 are used for allowing the primary grouting pipe 6/secondary grouting pipe 7 to pass through so as to perform primary grouting/secondary grouting on the inside of the drill hole 100 to form a primary grouting part S1/secondary grouting part S2, and in this embodiment, the number of the ventilation holes 43 and the grouting holes 44 is 2;
a steel pad pier 5, which is disposed at an end of the drill hole 100 away from the guide member 3 and is in communication with the drill hole 100, for uniformly diffusing the prestress of the anchor cable steel strand 1 to the surface of the surrounding rock, specifically, as shown in fig. 1,6 to 7, comprising: an upper pad 51; a lower pad 52 disposed opposite to the upper pad 51, and a third through hole 521 communicating with the borehole 100 is formed at the center of the lower pad 52; a connecting member 53, which may be a cylindrical structure, for connecting the upper pad 51 and the lower pad 52, and which is made of a steel material; a plurality of reinforcing ribs 54 disposed between the upper and lower pads 51 and 52 and surrounding the connection member 53, preferably, the reinforcing ribs 54 may have a right trapezoid shape, wherein a short parallel side 541 of the right trapezoid-shaped reinforcing rib 54 is connected to the upper pad 51, a long parallel side 542 is connected to the lower pad 312, a right angle side 543 is connected to an outer wall surface of the connection member 53, and a sloping side 544 is remote from the connection member 53; a hard layer 55 (which may be made of M40 dry pre-shrinking mortar) covering the opening of the drill hole 100 near the steel pad pier 5, and having a fourth through hole 551 in the middle; and a connection pipe 56 (preferably, a steel pipe) having one end connected to the third through hole 521 and the other end penetrating through the fourth through hole 551 and then extending into the borehole 100, and through which the grouting pipe 200 penetrates.
At least two grouting pipe inlet and outlet holes 531 are formed in the connecting piece 53; the primary grouting pipe 6 passes through a grouting pipe inlet and outlet hole 531, a third through hole 521 and a grouting hole 44 of the isolation frame and then extends into the drill hole 100 for primary grouting, and similarly, the secondary grouting pipe 7 passes through a grouting pipe inlet and outlet hole 531, a third through hole 521 and a grouting hole 44 of the isolation frame and then extends into the drill hole 100 for secondary grouting.
On this basis, in order to achieve a better fixing effect, the lower pad 52 may further be provided with at least one bolt fixing hole through which the bolt 57 may pass, one end of the bolt 57 passes through the lower pad 52 and is fixedly connected with the hard layer 55, and the other end is fixedly connected with the nut 58, so as to fixedly connect the lower pad 52 with the hard layer 55.
Embodiment two:
the embodiment also provides a tunnel surrounding rock anchoring structure, as shown in fig. 2, which includes: a borehole 100 formed in the surrounding rock of the tunnel, the anchor cable structure described in the embodiment, and a grid steel frame 200 buried in the surrounding rock; the anchor cable steel strand 1, the primary grouting pipe 6 and the secondary grouting pipe 7 extend into the drill hole 100;
as shown in fig. 8, the grid steel frame 200 includes: an inner steel frame member 201, an outer steel frame member 202, and a filler member disposed between the inner steel frame member 201 and the outer steel frame member 202; specifically, the filler includes: the "≡" shaped piece 203 and/or the "X" shaped piece 204 and/or the "Z" shaped piece 205 are preferably different in structure from each other, so that the surrounding rock can be further supported and reinforced by the grid steel frame 200, and the structural strength of the surrounding rock is enhanced.
Embodiment III:
the present embodiment also provides a construction method of the tunnel surrounding rock anchoring structure as described in embodiment two, which includes the following steps:
s1, adopting an HT150 type mining down-the-hole drill to open at least one drill hole in surrounding rock of a tunnel; the special HT150 type mining down-the-hole drill can realize quick drilling, and drilling construction can be completed within 1 hour;
s2, fixing the steel pad pier on the inner wall surface of the tunnel, and arranging a separation frame and a guide piece in the drilled hole;
s3, one end of the anchor cable steel strand penetrates through the guide piece and the isolation frame and then stretches into the drill hole, the other end of the anchor cable steel strand is fixed on the steel pad pier, and the primary grouting pipe and the secondary grouting pipe penetrate through the grouting pipe inlet and outlet hole, the third through hole and one grouting hole of the isolation frame and then stretch into the drill hole;
s4, burying the grid steel frame in the surrounding rock, and carrying out primary grouting on the surrounding rock at a position 1-3m away from a drilling hole opening in a drilling hole through a primary grouting pipe, wherein the primary grouting slurry comprises sulphoaluminate early strength cement so as to form a primary grouting part for sealing the drilling hole opening, so that a sealing condition is provided for secondary high-pressure grouting, and leakage is prevented;
and after the strength of the primary grouting part is greater than 20Mpa, carrying out secondary grouting on other areas which are not subjected to primary grouting in the drill hole through the secondary grouting pipe, wherein the grouting pressure is 3-9 Mpa, and the secondary grouting slurry comprises quick hardening sulphoaluminate cement.
The sulphoaluminate cement has early high-strength performance, the compressive strength of 12 h-1 d can reach 35-50 MPa, and the flexural strength can reach 6.5-7.5 MPa; the compressive strength of 3d can reach 50-70 MPa, and the flexural strength can reach 7.5-8.5 MPa; in the construction method, the anchor cable in the first embodiment is installed for 1 hour, grouting is carried out for 1 hour, grouting body is solidified for 12 hours, the anchor cable is tensioned for 0.5 hour, the whole construction process from drilling to tensioning can be completed within 15 hours, and the common anchor cable approximately needs 20 days from drilling to tensioning, so that the construction time of the anchor cable structure and the construction method thereof can be greatly reduced, and the anchor cable support structure for quick tensioning can be provided for a weak surrounding rock large-span tunnel with short self-stabilizing time.
In summary, the anchor cable structure is sleeved on the anchor cable steel strand through the anchor cable barb, so that the bond force and the anchoring force between the steel strand and the grouting body can be effectively increased, the slipping phenomenon of the steel strand and the grouting body at the anchoring section can be prevented without increasing the length of the grouting body, meanwhile, the grouting is carried out on the drill holes in a multi-stage grouting mode, the grouting pressure of secondary grouting can be greatly improved, the cohesive force between the anchor cable grouting body and surrounding rock is improved, the grouting effect is improved, particularly, the anchor cable structure has a good reinforcing effect on weak surrounding rock, the slipping during the drawing of the anchor cable can be prevented, and the prestress level of the anchor cable is improved; in addition, the invention can greatly shorten the consolidation time of the grouting body, so that the anchor cable construction can be completed within 15 hours, and a fast tensioning anchor cable supporting structure is provided for the weak surrounding rock large-span tunnel with shorter self-stabilization time.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. An anchor cable structure capable of secondary grouting, which is characterized by comprising:
at least one anchor cable steel strand arranged in the borehole;
a primary grouting pipe extending into the drill hole for primary grouting of surrounding rock in the drill hole at a distance of 1-3m from the drill hole orifice to form a primary grouting part for closing the drill hole orifice;
the secondary grouting pipe extends into the drill hole and is used for carrying out secondary grouting on other areas which are not subjected to primary grouting in the drill hole;
the guide piece is arranged in the drilling hole and used for allowing the anchor cable steel strand to pass through, so that the anchor cable steel strand is guided into the drilling hole;
at least one binding element for binding the anchor cable steel strands extending into the borehole;
the anchor cable structure further comprises anchor cable barbs sleeved on at least one anchor cable steel twisted wire; the anchor cable barb includes:
an external anchor ring, wherein a through hole with a trapezoid longitudinal section for the anchor cable steel strand to pass through is formed in the external anchor ring;
and at least one clamping piece, which is used for wedging one end of the anchor cable steel strand into a gap between the anchor cable steel strand and the inner wall of the perforation when the anchor cable steel strand passes through the perforation, and the other end of the clamping piece extends out of the outer anchor ring;
wherein, the anchor cable structure and the grid steel frame buried in the surrounding rock; the anchor cable steel strand, the primary grouting pipe, the secondary grouting pipe and the guide piece extend into the drill hole;
the grid steel frame comprises: the filling piece is arranged between the inner steel frame piece and the outer steel frame piece;
one end of the anchor cable steel strand penetrates through the guide piece and the isolation frame and then stretches into the drill hole, and the primary grouting pipe and the secondary grouting pipe penetrate through the grouting pipe inlet and outlet hole, the third through hole and a grouting hole of the isolation frame and then stretch into the drill hole;
burying the grid steel frame in the surrounding rock, and performing primary grouting on the surrounding rock at a position 1-3m away from a drilling hole orifice in a drilling hole through a primary grouting pipe so as to form a primary grouting part for sealing the drilling hole orifice; and after the strength of the primary grouting part is greater than 20Mpa, performing secondary grouting on other areas which are not subjected to primary grouting in the drill hole through the secondary grouting pipe.
2. The secondary grouting cable structure of claim 1, further comprising: at least one spacer, it sets up in inside the drilling, include:
the first through hole is arranged in the center of the isolation frame;
a plurality of second through holes uniformly spaced around the first through hole; the first through hole and/or the second through hole are/is used for the anchor cable steel strand to pass through;
at least one vent hole and at least one grouting hole; the vent hole is used for allowing a gas supply source to enter when primary grouting/secondary grouting is carried out in the drill hole so as to adjust the gas pressure in the drill hole; the grouting holes are used for allowing the primary grouting pipe/secondary grouting pipe to pass through so as to perform primary grouting/secondary grouting on the inside of the drilling hole.
3. The secondary grouting cable structure of claim 2, further comprising: a steel pad pier disposed in the bore distal to one end of the guide and in communication with the bore, comprising: an upper backing plate; a lower backing plate arranged opposite to the upper backing plate; a connecting member for connecting the upper pad and the lower pad; and the reinforcing ribs are arranged between the upper backing plate and the lower backing plate and surround the connecting piece.
4. The secondary grouting anchor cable structure of claim 3, wherein the connecting piece is provided with at least two grouting pipe inlet and outlet holes; a third through hole communicated with the drilling hole is formed in the center of the lower base plate; the primary grouting pipe penetrates through a grouting pipe inlet and outlet hole, a third through hole and a grouting hole of the isolation frame and then stretches into the drill hole to perform primary grouting, and the secondary grouting pipe penetrates through a grouting pipe inlet and outlet hole, the third through hole and a grouting hole of the isolation frame and then stretches into the drill hole to perform secondary grouting.
5. The secondary grouting cable structure of claim 4, further comprising: and one end of the connecting pipe is connected with the third through hole, and the other end of the connecting pipe stretches into the drilling hole and is used for the grouting pipe to pass through.
6. The secondary grouting-able anchor line structure of claim 5, wherein the filler member comprises: a "-infinity" type and/or an "X" type and/or a "Z" type.
7. The secondary grouting anchor cable structure of claim 1, wherein in step S1, drilling holes are formed by using an HT150 type mine down-the-hole drill; in step S4, the grouting slurry of the primary grouting and/or the secondary grouting comprises sulphoaluminate cement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810956831.4A CN108979689B (en) | 2018-08-21 | 2018-08-21 | Anchor cable structure capable of secondary grouting, tunnel surrounding rock anchoring structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810956831.4A CN108979689B (en) | 2018-08-21 | 2018-08-21 | Anchor cable structure capable of secondary grouting, tunnel surrounding rock anchoring structure and construction method |
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| CN108979689A CN108979689A (en) | 2018-12-11 |
| CN108979689B true CN108979689B (en) | 2023-12-15 |
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| CN111980733B (en) * | 2020-07-28 | 2022-08-16 | 中铁工程设计咨询集团有限公司 | Anchor cable and construction method thereof |
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