CN112431199A - Construction method for improving anti-pulling performance of twisted steel anchor rod - Google Patents
Construction method for improving anti-pulling performance of twisted steel anchor rod Download PDFInfo
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- CN112431199A CN112431199A CN202011367354.1A CN202011367354A CN112431199A CN 112431199 A CN112431199 A CN 112431199A CN 202011367354 A CN202011367354 A CN 202011367354A CN 112431199 A CN112431199 A CN 112431199A
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- anchor rod
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- pulling resistance
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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
- 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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention particularly relates to a construction method for improving the anti-pulling performance of a twisted steel anchor rod, and solves the problems of resource waste, labor waste and time waste caused by the fact that the length of an anchoring section exceeds the actual requirement when the conventional construction method of the twisted steel anchor rod is applied. A construction method for improving the anti-pulling performance of a deformed steel bar anchor rod comprises the following steps: s1: a plurality of vertical rib column grooves are vertically formed in the surrounding rock wall; s2: drilling a plurality of anchor rod holes in the bottom wall of each vertical rib column groove; s3: installing a plurality of anti-pulling resistance blocks on the anchoring section of each threaded steel bar anchor rod; s4: putting a twisted steel anchor rod into the anchor rod hole, and pouring cement mortar into the anchor rod hole; s5: binding the steel bars of the vertical rib columns and the panels, erecting a mould, and pouring concrete; s6: and sealing the end part of the twisted steel anchor rod outside the panel. The method reduces the construction cost, accelerates the construction progress, is suitable for the stability protection engineering of the high slope excavated by the stone, and can be popularized and applied in the similar engineering.
Description
Technical Field
The invention relates to a construction method for protecting the stability of a high slope of a stone excavation, in particular to a construction method for improving the pulling resistance of a twisted steel bar anchor rod.
Background
With the expansion of construction scale and the progress of civil engineering technology, foundation pits are continuously deepened and steep slopes are continuously increased, and in recent years, a novel supporting and retaining structure adopting anchor rods (or anchor cables) to provide balance force is widely applied, such as an anchor rod retaining wall. At present, the anchoring anti-pulling force of the deformed steel bar is obviously improved compared with that of a common round steel bar, and the deformed steel bar is small and economical after being pulled compared with a steel wire rope, so that the hot-rolled deformed steel bar is generally adopted to be directly used as a material of an anchor rod in anchor rod retaining wall engineering. The twisted steel anchor rod is divided into an anchoring section and a tension transmission section, and the anchoring section is fixedly connected with surrounding rocks in the drill hole by pouring cement mortar into the drill hole.
However, practice shows that the construction method of the existing threaded steel bar anchor rod has the following problems in application: when its anchor power is not enough or cement mortar intensity is not enough, easily lead to the stock to extract out the inefficacy from cement mortar, consequently the designer is when the design, and the anchor section length of stock often surpasss actual need more, has both increased drilling depth, stock length, cement mortar quantity, takes a lot of work and time again. In view of this, a construction method for improving the anti-pulling performance of the twisted steel anchor rod is needed to be invented, so that the anti-pulling resistance of the anchor rod is increased, the length of the anchoring section of the anchor rod is properly shortened, and the aims of reducing waste (drilling and grouting) and realizing rapid construction are fulfilled.
Disclosure of Invention
The invention provides a construction method for improving the anti-pulling performance of a twisted steel anchor rod, aiming at solving the problems of resource waste, labor waste and time waste caused by the fact that the length of an anchoring section exceeds the actual requirement when the conventional construction method of the twisted steel anchor rod is applied.
The invention is realized by adopting the following technical scheme:
a construction method for improving the anti-pulling performance of a deformed steel bar anchor rod comprises the following steps:
s1: vertically forming a plurality of vertical rib column grooves on the surrounding rock wall, and rejecting rock masses in the vertical rib column grooves;
s2: drilling a plurality of anchor rod holes in the bottom wall of each vertical rib column groove, and cleaning each anchor rod hole;
s3: installing a plurality of anti-pulling resistance blocks on the anchoring section of each threaded steel bar anchor rod; the installation process is realized by adopting the following steps: a. screwing the sleeve on the anchoring section of the twisted steel anchor rod; the sleeve comprises a straight cylinder body positioned at the head part and a conical cylinder body which is connected with the straight cylinder body into a whole end to end, and the diameter of the head end of the conical cylinder body is smaller than that of the tail end of the conical cylinder body; b. a U-shaped clamp with a downward opening and external threads at the end part of the opening is arranged on the sleeve, so that the U-shaped clamp is positioned between the straight cylinder body and the conical cylinder body; c. installing a strip-shaped pressing piece at the end part of the opening of the U-shaped card, so that the upper surface of the strip-shaped pressing piece is abutted against the side wall of the sleeve; d. installing two locking nuts at the bottom of the U-shaped clamp, so that the upper surfaces of the two locking nuts are tightly attached to the lower surface of the strip-shaped pressing piece, and thus, the installation of an anti-pulling resistance block is completed; e. and so on, completing the installation of other anti-pulling resistance blocks, so that the axial distribution intervals of all the anti-pulling resistance blocks along the twisted steel anchor rod are consistent;
s4: putting the twisted steel anchor rods into the anchor rod holes in a one-to-one correspondence manner, enabling the conical cylinders of the sleeves to be positioned on one side close to the bottom of the anchor rod hole, and pouring cement mortar into the anchor rod holes;
s5: binding the steel bars of the vertical rib columns and the panels, erecting a mould, and pouring concrete in situ to form the vertical rib columns and the panels;
s6: after the vertical rib column and the panel reach certain strength, the end part of the twisted steel anchor rod is sealed and anchored outside the panel.
The U-shaped clamp is made of a cylindrical rod; the side wall of the sleeve is provided with an annular groove which is positioned between the straight cylinder and the conical cylinder and is matched with the U-shaped clamp in shape; the inner side of the U-shaped card is clamped in the inner cavity of the circular groove.
The inside wall of straight barrel, the inside wall of awl barrel all are provided with spiral helicine bead strip, and the pitch of convex bead strip is unanimous with the pitch of twisted steel stock.
The straight cylinder body is formed by splicing two straight cylinder units which are symmetrically arranged left and right; the cone body is formed by splicing two cone units which are symmetrically arranged left and right, and each cone unit is connected with a straight unit corresponding to the cone unit in front and back into a whole.
The upper surface of the strip-shaped pressing piece is provided with an arc-shaped groove matched with the side wall of the sleeve in shape.
The sleeve, the U-shaped clamp and the strip-shaped pressing piece are all made of steel.
The diameter of the threaded steel bar anchor rod is 20mm or 32 mm; the distance between the anti-pulling resistance blocks is 1.0m-1.5 m.
Compared with the existing construction method of the twisted steel anchor rod, the construction method for improving the pulling resistance of the twisted steel anchor rod has the following advantages: the conical cylinder body increases the resistance area of the anti-pulling resistance block, and the anti-pulling performance of the twisted steel anchor rod is improved; the U-shaped clamp and the strip-shaped pressing piece can increase the firmness of the combination of the sleeve and the twisted steel anchor rod, prevent the sleeve from shifting, further improve the anti-pulling performance of the twisted steel anchor rod, further shorten the drilling depth and the anchoring length of the twisted steel anchor rod, reduce the using amount of cement mortar and accelerate the construction progress; the circular groove can prevent the U-shaped card from slipping off the sleeve; the process that the sleeve was twisted from the twisted steel stock bottom has been saved in the structural design of straight section of thick bamboo unit and awl section of thick bamboo unit, and the simple operation nature when having increased this resistance to plucking piece installation has further accelerated the construction progress.
The construction method effectively solves the problems of resource waste, labor waste and time waste caused by the fact that the length of the anchoring section exceeds the actual requirement when the conventional construction method of the twisted steel anchor rod is applied, reduces the construction cost, accelerates the construction progress, is suitable for the high slope stability protection engineering of stone excavation, and can also be popularized and applied in the similar engineering.
Drawings
FIG. 1 is a schematic view of the anti-pullout resistance block of the present invention;
fig. 2 is a schematic view of the construction of the sleeve of fig. 1.
In the figure, 1-U-shaped clamp, 2-strip-shaped pressing piece, 3-locking nut, 4-circular groove, 5 a-straight cylinder unit, 5 b-conical cylinder unit and 6-arc groove.
Detailed Description
A construction method for improving the anti-pulling performance of a deformed steel bar anchor rod comprises the following steps:
s1: vertically forming a plurality of vertical rib column grooves on the surrounding rock wall, and rejecting rock masses in the vertical rib column grooves;
s2: drilling a plurality of anchor rod holes in the bottom wall of each vertical rib column groove, and cleaning each anchor rod hole;
s3: installing a plurality of anti-pulling resistance blocks on the anchoring section of each threaded steel bar anchor rod; the installation process is realized by adopting the following steps: a. screwing the sleeve on the anchoring section of the twisted steel anchor rod; the sleeve comprises a straight cylinder body positioned at the head part and a conical cylinder body which is connected with the straight cylinder body into a whole end to end, and the diameter of the head end of the conical cylinder body is smaller than that of the tail end of the conical cylinder body; b. a U-shaped card 1 with a downward opening and an external thread at the end part of the opening is arranged on the sleeve, so that the U-shaped card 1 is positioned between the straight cylinder body and the conical cylinder body; c. installing a strip-shaped pressing piece 2 at the opening end part of the U-shaped card, so that the upper surface of the strip-shaped pressing piece 2 is abutted against the side wall of the sleeve; d. installing two locking nuts 3 at the bottom of the U-shaped card 1, so that the upper surfaces of the two locking nuts 3 are tightly attached to the lower surface of the strip-shaped pressing piece 2, and thus, the installation of an anti-pulling resistance block is completed; e. and so on, completing the installation of other anti-pulling resistance blocks, so that the axial distribution intervals of all the anti-pulling resistance blocks along the twisted steel anchor rod are consistent;
s4: putting the twisted steel anchor rods into the anchor rod holes in a one-to-one correspondence manner, enabling the conical cylinders of the sleeves to be positioned on one side close to the bottom of the anchor rod hole, and pouring cement mortar into the anchor rod holes;
s5: binding the steel bars of the vertical rib columns and the panels, erecting a mould, and pouring concrete in situ to form the vertical rib columns and the panels;
s6: after the vertical rib column and the panel reach certain strength, the end part of the twisted steel anchor rod is sealed and anchored outside the panel.
The U-shaped clamp 1 is made of a cylindrical rod; the side wall of the sleeve is provided with an annular groove 4 which is positioned between the straight cylinder and the conical cylinder and is matched with the U-shaped clamp 1 in shape; the inner side of the U-shaped card 1 is clamped in the inner cavity of the circular groove 4. The inside wall of straight barrel, the inside wall of awl barrel all are provided with spiral helicine bead strip, and the pitch of convex bead strip is unanimous with the pitch of twisted steel stock. The straight cylinder body is formed by splicing two straight cylinder units 5a which are symmetrically arranged left and right; the cone body is formed by splicing two cone units 5b which are symmetrically arranged left and right, and each cone unit 5b is connected with a straight unit 5a corresponding to the cone unit in front and back into a whole. The upper surface of the strip-shaped pressing piece 2 is provided with an arc-shaped groove 6 matched with the side wall of the sleeve in shape. The sleeve, the U-shaped clamp 1 and the strip-shaped pressing piece 2 are all made of steel. The diameter of the threaded steel bar anchor rod is 20mm or 32 mm; the distance between the anti-pulling resistance blocks is 1.0m-1.5 m.
Claims (7)
1. A construction method for improving the anti-pulling performance of a twisted steel anchor rod is characterized by comprising the following steps: the method comprises the following steps:
s1: vertically forming a plurality of vertical rib column grooves on the surrounding rock wall, and rejecting rock masses in the vertical rib column grooves;
s2: drilling a plurality of anchor rod holes in the bottom wall of each vertical rib column groove, and cleaning each anchor rod hole;
s3: installing a plurality of anti-pulling resistance blocks on the anchoring section of each threaded steel bar anchor rod; the installation process is realized by adopting the following steps: a. screwing the sleeve on the anchoring section of the twisted steel anchor rod; the sleeve comprises a straight cylinder body positioned at the head part and a conical cylinder body which is connected with the straight cylinder body into a whole end to end, and the diameter of the head end of the conical cylinder body is smaller than that of the tail end of the conical cylinder body; b. a U-shaped clamp (1) with a downward opening and external threads at the end part of the opening is arranged on the sleeve, so that the U-shaped clamp (1) is positioned between the straight cylinder body and the conical cylinder body; c. a strip-shaped pressing piece (2) is arranged at the end part of the opening of the U-shaped card, so that the upper surface of the strip-shaped pressing piece (2) is abutted against the side wall of the sleeve; d. two locking nuts (3) are arranged at the bottom of the U-shaped clamp (1), so that the upper surfaces of the two locking nuts (3) are tightly attached to the lower surface of the strip-shaped pressing piece (2), and the installation of an anti-pulling resistance block is completed; e. and so on, completing the installation of other anti-pulling resistance blocks, so that the axial distribution intervals of all the anti-pulling resistance blocks along the twisted steel anchor rod are consistent;
s4: putting the twisted steel anchor rods into the anchor rod holes in a one-to-one correspondence manner, enabling the conical cylinders of the sleeves to be positioned on one side close to the bottom of the anchor rod hole, and pouring cement mortar into the anchor rod holes;
s5: binding the steel bars of the vertical rib columns and the panels, erecting a mould, and pouring concrete in situ to form the vertical rib columns and the panels;
s6: after the vertical rib column and the panel reach certain strength, the end part of the twisted steel anchor rod is sealed and anchored outside the panel.
2. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the U-shaped clamp (1) is made of a cylindrical rod; the side wall of the sleeve is provided with an annular groove (4) which is positioned between the straight cylinder and the conical cylinder and is matched with the U-shaped clamp (1) in shape; the inner side of the U-shaped card (1) is clamped in the inner cavity of the circular groove (4).
3. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the inside wall of straight barrel, the inside wall of awl barrel all are provided with spiral helicine bead strip, and the pitch of convex bead strip is unanimous with the pitch of twisted steel stock.
4. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the straight cylinder body is formed by splicing two straight cylinder units (5 a) which are symmetrically arranged left and right; the cone body is formed by splicing two cone units (5 b) which are symmetrically arranged left and right, and each cone unit (5 b) is connected with a straight unit (5 a) which corresponds to the cone unit in front and back into a whole.
5. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the upper surface of the strip-shaped pressing piece (2) is provided with an arc-shaped groove (6) matched with the side wall of the sleeve in shape.
6. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the sleeve, the U-shaped clamp (1) and the strip-shaped pressing piece (2) are all made of steel.
7. The construction method for improving the pulling resistance of the deformed steel bar anchor rod according to claim 1, is characterized in that: the diameter of the threaded steel bar anchor rod is 20mm or 32 mm; the distance between the anti-pulling resistance blocks is 1.0m-1.5 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011367354.1A CN112431199B (en) | 2020-11-28 | 2020-11-28 | Construction method for improving anti-pulling performance of twisted steel anchor rod |
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| CN202011367354.1A CN112431199B (en) | 2020-11-28 | 2020-11-28 | Construction method for improving anti-pulling performance of twisted steel anchor rod |
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| CN112431199A true CN112431199A (en) | 2021-03-02 |
| CN112431199B CN112431199B (en) | 2022-05-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8329605D0 (en) * | 1983-11-05 | 1983-12-07 | Hsi Huan Lu | Recoverable ground anchor |
| CN200968002Y (en) * | 2006-11-15 | 2007-10-31 | 武汉武大巨成加固实业有限公司 | Multiple layer back taper type wedge-locking roofbolt |
| CN204753583U (en) * | 2015-07-03 | 2015-11-11 | 宁波鸿晨建设有限公司 | Recoverable anchor rope type of high pressure jet soil cement stock bears head |
| CN207454006U (en) * | 2017-09-05 | 2018-06-05 | 长沙学院 | A kind of integral type anchor pole |
| CN108385679A (en) * | 2018-06-01 | 2018-08-10 | 宁波它山奇境文化旅游发展有限公司 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
| CN109797751A (en) * | 2018-12-10 | 2019-05-24 | 中国电建集团华东勘测设计研究院有限公司 | A kind of anchor structure being suitable for large deformation and construction method |
-
2020
- 2020-11-28 CN CN202011367354.1A patent/CN112431199B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8329605D0 (en) * | 1983-11-05 | 1983-12-07 | Hsi Huan Lu | Recoverable ground anchor |
| CN200968002Y (en) * | 2006-11-15 | 2007-10-31 | 武汉武大巨成加固实业有限公司 | Multiple layer back taper type wedge-locking roofbolt |
| CN204753583U (en) * | 2015-07-03 | 2015-11-11 | 宁波鸿晨建设有限公司 | Recoverable anchor rope type of high pressure jet soil cement stock bears head |
| CN207454006U (en) * | 2017-09-05 | 2018-06-05 | 长沙学院 | A kind of integral type anchor pole |
| CN108385679A (en) * | 2018-06-01 | 2018-08-10 | 宁波它山奇境文化旅游发展有限公司 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
| CN109797751A (en) * | 2018-12-10 | 2019-05-24 | 中国电建集团华东勘测设计研究院有限公司 | A kind of anchor structure being suitable for large deformation and construction method |
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| CN112431199B (en) | 2022-05-10 |
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