CN113152284A - Anchor cable construction method - Google Patents
Anchor cable construction method Download PDFInfo
- Publication number
- CN113152284A CN113152284A CN202110240575.0A CN202110240575A CN113152284A CN 113152284 A CN113152284 A CN 113152284A CN 202110240575 A CN202110240575 A CN 202110240575A CN 113152284 A CN113152284 A CN 113152284A
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- Prior art keywords
- anchor
- grouting
- hole
- anchor cable
- construction method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000011083 cement mortar Substances 0.000 claims abstract description 5
- 239000011241 protective layer Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 7
- 235000014121 butter Nutrition 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 7
- 239000011435 rock Substances 0.000 description 13
- 239000011440 grout Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000004575 stone Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 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
- 239000002245 particle Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention provides an anchor cable construction method, which comprises the following steps: s1, preparing an anchor cable; s2, drilling; s3, mounting anchor cables; s4, grouting, namely grouting the inside of the drill hole by using a grouting machine; s5, tensioning the anchor cables, and performing single-strand graded tensioning on the steel strands of the anchor cables in each drilled hole; s6, secondary grouting, and directly grouting into the drill hole from a grouting pipe of the anchor backing plate by using a grouting machine after tensioning is finished; s7, protecting the outside, after secondary grouting, remaining a steel strand of 45-55 mm from the anchor backing plate, cutting the rest part, and coating a cement mortar protective layer with the thickness not less than the length of the steel strand on the outside; the construction method is convenient to implement, the centering device is arranged on the anchor cable, so that the installation precision of the anchor cable in the drill hole can be guaranteed, the connection strength of the anchor rod and the drill hole is guaranteed, the drill hole can be completely filled with slurry through twice grouting, the gap is reduced, and the fixing strength is further improved.
Description
Technical Field
The invention belongs to the technical field of building construction methods, and particularly relates to an anchor cable construction method.
Background
The anchor cable is characterized in that when the main cable is anchored in a side hole in a suspension bridge, the main cable is divided into a plurality of steel bundles which are respectively anchored in an anchor ingot, and the steel bundles are called as the anchor cables. The anchor cable is a prestressed steel strand which is fixed on the slope surface through the outer end and passes through the sliding surface of the side slope in a stable rock body anchored in the sliding surface at the other end, so that the anti-sliding resistance is directly generated on the sliding surface, the anti-sliding friction resistance is increased, the structural surface is in a compact state, and the integrity of the rock body of the side slope is improved, thereby fundamentally improving the mechanical property of the rock body, effectively controlling the displacement of the rock body, promoting the stability of the rock body, and achieving the purpose of renovating bedding, landslides, dangerous rocks and dangerous rocks.
In the prior art, for example, chinese patent application No. CN202010729943.3 discloses an anchor cable structure and an anchor cable frame beam construction method, which includes the following steps: carrying out slope cleaning treatment on the slope surface of the side slope according to the designed slope rate, designing the anchor hole spacing, inclination angle and elevation of the anchor cable frame beam according to the height of the side slope and the geological condition, and determining the position of the vertical rib column and the position of the transverse rib column; excavating vertical rib column pit slots at the vertical rib column positions of the anchor cable frame beams and cleaning soil bodies, performing waterless dry drilling at the anchor hole positions to a designed depth to obtain anchor holes, and cleaning slag and soil in the anchor holes; erecting a template of the vertical rib column, erecting a steel bar of the vertical rib column, and positioning an anchorage above the anchor hole; pouring concrete into the template of the vertical rib column to form the vertical rib column; the anchor cable of the anchor cable structure is arranged in the anchor hole, slurry is injected into the anchor hole through the grouting pipe until the slurry liquid level reaches the top surface of the anchoring section of the anchor cable structure, the grouting hole and the exhaust hole are closed, and the anchor cable is stretched, wherein the anchor cable of one frame beam is stretched diagonally or the anchor cable on the whole frame beam is stretched simultaneously; the exposed head of the anchorage device is sealed by utilizing the concrete frame beam to form a concrete anchorage inclined support, and an anchorage head is formed at the residual exposed part of the anchorage device sealed by adopting concrete; excavating transverse rib column pit slots in sequence, cleaning soil, erecting a template of a transverse rib column, erecting transverse rib column reinforcing steel bars, and pouring concrete into the template of the transverse rib column to form the transverse rib column; removing broken rocky soil, pouring a stone concrete foundation, and flattening the surface; the vertical rib columns from the anchor cable frame beam to the anchor cable frame beam of the lower layer side slope are constructed and connected with the roadbed side ditch, so that the construction method of the number of commercial customers is complicated and is not easy to implement.
Therefore, an anchor cable construction method which is convenient to implement and improves the installation accuracy and the connection strength between the anchor cable and the drilled hole needs to be designed to solve the technical problems faced at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the anchor cable construction method which is convenient to implement and can improve the installation precision and the connection strength between the anchor cable and the drilled hole.
The technical scheme of the invention is as follows: the anchor cable construction method comprises the following steps:
s1, preparing an anchor cable, uniformly arranging a plurality of centralizers in the axial direction of the anchor cable, fastening a fastening ring between two adjacent centralizers, fastening a fastening ring at each meter of a stretching end, sleeving a plastic pipe, coating butter in the plastic pipe, and sleeving a guide cap on the end socket of the anchor cable;
s2, drilling, namely forming a drill hole matched with the anchor rod on the ground according to a drawing, forming a downward 15-degree intersection angle between the drill hole and a horizontal plane, measuring the hole depth and cleaning the hole bottom and the hole wall;
s3, mounting anchor cables, and respectively assembling the anchor cables into corresponding drill holes;
s4, grouting, namely grouting the inside of the drill hole by using a grouting machine;
s5, tensioning the anchor cables, and performing single-strand graded tensioning on the steel strands of the anchor cables in each drilled hole;
s6, secondary grouting, and directly grouting the anchor backing plate into the inner part of the drill hole from a grouting pipe of the anchor backing plate by using a grouting machine after tensioning is finished;
and S7, protecting the outside, after secondary grouting, reserving a steel strand of 45-55 mm from the anchor backing plate, cutting the rest part, and coating a cement mortar protective layer with the thickness not less than the length of the steel strand outside the steel strand.
In step S1, a centering device is disposed every 2.0m in the cable line axis direction.
In the step S2, the depth of the drilled hole is greater than the length of the anchor cable by 0.5 ± 0.005 m.
In the step S2, a plastic pipe is used to go deep into the drilled hole to measure the hole depth, and high-pressure air is used to blow and dry the bottom and the wall of the hole.
In step S2, a down-the-hole hammer drill is used to drill a hole.
In the step S4, a BW-150 type grouting machine is adopted to perform grouting to the inside of the drill hole, and the pressure of the opening of the grouting pipe is not less than 0.5 Mpa.
In the step S5, the tension control stress is 0.75fp, the tension is performed until the tension is 105% of the design tension, the load is maintained for 5 minutes, the load is unloaded until the design tension is 100%, and the locking is performed.
In step S7, a 50mm steel strand is left from the anchor backing plate after the second grouting.
The invention has the beneficial effects that: the construction method is convenient to implement, the centering device is arranged on the anchor cable, so that the installation precision of the anchor cable in the drill hole can be guaranteed, the connection strength of the anchor rod and the drill hole is guaranteed, the inner part of the drill hole can be completely filled with slurry through twice grouting, the gap is reduced, and the fixing strength is further improved.
Detailed Description
The following examples further describe embodiments of the present invention.
The anchor cable construction method comprises the following steps:
s1, preparing an anchor cable, uniformly arranging a plurality of centralizers in the axial direction of the anchor cable, fastening a fastening ring between two adjacent centralizers, fastening a fastening ring at each meter of a stretching end, sleeving a plastic pipe, coating butter in the plastic pipe, and sleeving a guide cap on the end socket of the anchor cable;
s2, drilling, namely forming a drilling hole matched with the anchor rod on the ground according to a drawing, wherein the drilling hole and a horizontal plane form a downward 15-degree intersection angle, measuring the hole depth and cleaning the hole bottom and the hole wall, the drilling is a key step for controlling the construction period in the construction of the anchor cable, the drilling rods matched with the drilling machine are in uniform specification and length, the drilling rods are calculated before drilling, the drilling rods needed by the drilling are placed in order according to the designed length of the anchor cable, the drilling rods are used up, the hole depth is right in place, the drilling is finished, the drilling rods and the drilling tool are pulled out one by one, and the impactor is cleaned for later use; checking the hole depth by a plastic pipe or calculating the hole depth by the number of drill rods, blowing the bottom and the wall of the hole by high-pressure air, reporting to a field engineer and a field supervision acceptance check when dust in the hole is blown clean and the hole depth is not less than the design length of the anchor cable, and finally sealing and plugging the hole opening by a geotextile or a cement bag to prepare for next construction;
s3, installing anchor cables, namely respectively assembling the anchor cables into corresponding drill holes, checking whether the serial numbers of the anchor cables are consistent with the hole numbers before installing the cables into the anchor cable holes, and installing the anchor cables after confirming that no errors exist;
s4, grouting, namely grouting the interior of the drill hole by a grouting machine, grouting by a hole bottom grout return method, inserting a grouting pipe to the hole bottom, injecting mortar from the hole bottom, and discharging air from an anchor cable hole opening;
s5, tensioning the anchor cables, and performing single-strand graded tensioning on the steel strands of the anchor cables in each drilled hole;
s6, secondary grouting, wherein after tensioning is finished, a grouting machine is adopted to directly grout the inner part of the drilled hole from a grouting pipe of the anchor backing plate, secondary grouting is adopted to directly grout the inner part of the drilled hole from the grouting pipe of the anchor backing plate, and the position of the anchor backing plate or slope surface grout leakage is taken as a criterion for judging the end of grouting;
s7, protecting the outside, after secondary grouting, remaining a steel strand of 45-55 mm from the anchor backing plate, cutting the rest part, and coating a cement mortar protective layer with the thickness not less than the length of the steel strand on the outside;
in the embodiment, the construction method is convenient to implement, the centering device is arranged on the anchor cable, so that the installation precision of the anchor cable in the drill hole can be guaranteed, the connection strength of the anchor rod and the drill hole is guaranteed, the inner part of the drill hole can be completely filled with slurry through twice grouting, the gap is reduced, and the fixing strength is further improved.
In the above embodiment, in step S2, two special cases of drilling may occur: and (3) water seepage treatment, namely blowing small stone particles and gray aggregates without dust during the drilling process or when the hole is blown after the drilling is finished, indicating that water seepage exists in the hole and the rock powder is attached to the wall of the hole, injecting clean water if the hole is deep enough, blowing clean with high-pressure air until the clean water is blown out, stopping drilling immediately if the hole is deep enough, pulling out the drilling tool if the drilling tool still enters the hole even if the impactor works, continuously drilling after hole washing, and circulating the steps until the drilling is finished. Sometimes, the water seepage quantity in the hole is large, accumulated water exists, slurry and broken stones are blown out, and in this case, rock powder cannot stick the hole wall, and drilling can be continued as long as the impacter works; the method comprises the steps of treating hole collapse and drill sticking, wherein when a drill hole penetrates through a strong weathered rock stratum or a rock mass broken zone, the hole collapse is often caused, the main mark of the hole collapse is that rock powder is blown out of the hole and is mixed with some original-state (non-drill bit crushed, non-fresh and dull) stones, at the moment, the drilling is stopped immediately regardless of the drilling depth, a drilling tool is pulled out, wall fixing grouting is carried out, the grouting pressure is 0.4MPa, the grout is a mixed liquid of cement mortar and water glass, the hole is drilled again after 24 hours, in rainy seasons, the grout often seeps into the hole along the rock mass broken zone, before wall fixing grouting, the grout is washed out by water and wind (the stones collapsed into the drill hole are not required to be removed), otherwise, the wall fixing grouting effect is poor, and false images are easily caused.
Further, in step S1, a centering device is disposed every 2.0m in the axial direction of the anchor cable, so that the anchor cable can be conveniently embedded into the borehole in the middle during the installation of the anchor cable, the accuracy of the installation position of the anchor cable is ensured, and the construction quality of the anchor cable is ensured.
Further, in step S2, the depth of the drilled hole is greater than the anchor cable length by 0.5 ± 0.005m, which is beneficial to being completely embedded into the drilled hole and ensuring the connection strength.
Further, in step S2, the plastic pipe is used to drill the hole deeply, the hole depth is measured, and the hole bottom and the hole wall are blown clean by high pressure wind.
Further, in step S2, in order to improve the drilling efficiency and ensure the drilling quality, a down-the-hole percussion drill is used to drill the hole.
Further, in step S4, a BW-150 type grouting machine is used to perform grouting to the inside of the drill hole, the pressure of the pipe orifice of the grouting pipe is not less than 0.5Mpa, the BW-150 type grouting machine is used to perform cable hole grouting, the pressure of the pipe orifice of the grouting pipe is not less than 0.5Mpa, the grouting end is judged on site by the slurry flowing out from the orifice, the slurry is uniformly mixed by a mixing station or mixed on site, it is ensured that the measurement is accurately and uniformly mixed, and the grouting can be started until all indexes of the slurry meet the design requirements.
Further, in step S5, the tension control stress is 0.75fp, the tension is performed to 105% of the design tension, the load is maintained for 5 minutes, and the load is removed to 100% of the design tension, and the locking is performed.
Further, in step S7, a 50mm steel strand is left from the anchor pad after the second grouting.
The above-mentioned embodiments only express some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An anchor cable construction method is characterized by comprising the following steps:
s1, preparing an anchor cable, uniformly arranging a plurality of centralizers in the axial direction of the anchor cable, binding a fastening ring between every two adjacent centralizers, binding a fastening ring at each meter of a stretching end, sleeving the fastening ring through a plastic pipe, coating butter inside the plastic pipe, and sleeving a guide cap on the end socket of the anchor cable;
s2, drilling, namely forming a drill hole matched with the anchor rod on the ground according to a drawing, forming a downward 15-degree intersection angle between the drill hole and a horizontal plane, measuring the hole depth and cleaning the hole bottom and the hole wall;
s3, mounting anchor cables, and respectively assembling the anchor cables into corresponding drill holes;
s4, grouting, namely grouting the inside of the drill hole by using a grouting machine;
s5, tensioning the anchor cables, and performing single-strand graded tensioning on the steel strands of the anchor cables in each drilled hole;
s6, secondary grouting, and directly grouting into the drill hole from a grouting pipe of the anchor backing plate by using a grouting machine after tensioning is finished;
and S7, protecting the outside, after secondary grouting, reserving a steel strand of 45-55 mm from the anchor backing plate, cutting the rest part, and coating a cement mortar protective layer with the thickness not less than the length of the steel strand outside the steel strand.
2. The anchor cable construction method as claimed in claim 1, wherein: in step S1, a centering device is disposed every 2.0m in the cable line axis direction.
3. The anchor line construction method as claimed in claim 1, wherein in step S2, the depth of the drilled hole is greater than the length of the anchor line by 0.5 ± 0.005 m.
4. The anchor cable construction method as claimed in claim 1, wherein: in the step S2, the plastic pipe is used for measuring the hole depth in the deep drilling hole, and the bottom and the wall of the hole are blown clean by high-pressure air.
5. The anchor cable construction method as claimed in claim 1, wherein: in step S2, a down-the-hole hammer drill is used to drill a hole.
6. The anchor cable construction method as claimed in claim 1, wherein: in the step S4, a BW-150 type grouting machine is adopted to perform grouting to the inside of the drill hole, and the pressure of the opening of the grouting pipe is not less than 0.5 Mpa.
7. The anchor cable construction method as claimed in claim 1, wherein: in the step S5, the tension control stress is 0.75fp, the tension is performed until the tension is 105% of the design tension, the load is maintained for 5 minutes, the load is unloaded until the design tension is 100%, and the locking is performed.
8. The anchor cable construction method as claimed in claim 1, wherein: in step S7, a 50mm steel strand is left from the anchor backing plate after the second grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240575.0A CN113152284A (en) | 2021-03-04 | 2021-03-04 | Anchor cable construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240575.0A CN113152284A (en) | 2021-03-04 | 2021-03-04 | Anchor cable construction method |
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| Publication Number | Publication Date |
|---|---|
| CN113152284A true CN113152284A (en) | 2021-07-23 |
Family
ID=76884172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110240575.0A Pending CN113152284A (en) | 2021-03-04 | 2021-03-04 | Anchor cable construction method |
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| CN (1) | CN113152284A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970970A (en) * | 2016-05-25 | 2016-09-28 | 中国能源建设集团安徽电力建设第工程有限公司 | Pre-stressed anchor cable supporting construction method for near-railway deep foundation pit |
| CN106939609A (en) * | 2017-04-25 | 2017-07-11 | 安徽宝翔建设集团有限责任公司 | Lattice girder slope construction is continuous to become control construction method |
| CN109837895A (en) * | 2019-03-14 | 2019-06-04 | 东南大学 | A kind of big pressure dispersing anchorage cable construction of depth |
| CN111910630A (en) * | 2020-07-27 | 2020-11-10 | 中国建筑第二工程局有限公司 | Anchor cable structure and anchor cable frame beam construction method |
| CN112343049A (en) * | 2019-08-07 | 2021-02-09 | 厦门能巧堂建筑工程有限公司 | Anchor cable construction process for reinforcing dangerous rock face |
-
2021
- 2021-03-04 CN CN202110240575.0A patent/CN113152284A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970970A (en) * | 2016-05-25 | 2016-09-28 | 中国能源建设集团安徽电力建设第工程有限公司 | Pre-stressed anchor cable supporting construction method for near-railway deep foundation pit |
| CN106939609A (en) * | 2017-04-25 | 2017-07-11 | 安徽宝翔建设集团有限责任公司 | Lattice girder slope construction is continuous to become control construction method |
| CN109837895A (en) * | 2019-03-14 | 2019-06-04 | 东南大学 | A kind of big pressure dispersing anchorage cable construction of depth |
| CN112343049A (en) * | 2019-08-07 | 2021-02-09 | 厦门能巧堂建筑工程有限公司 | Anchor cable construction process for reinforcing dangerous rock face |
| CN111910630A (en) * | 2020-07-27 | 2020-11-10 | 中国建筑第二工程局有限公司 | Anchor cable structure and anchor cable frame beam construction method |
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Application publication date: 20210723 |