CN114319342B - Construction method of anti-floating anchor rod - Google Patents
Construction method of anti-floating anchor rod Download PDFInfo
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- CN114319342B CN114319342B CN202210007425.XA CN202210007425A CN114319342B CN 114319342 B CN114319342 B CN 114319342B CN 202210007425 A CN202210007425 A CN 202210007425A CN 114319342 B CN114319342 B CN 114319342B
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Abstract
The invention belongs to the technical field of anti-floating anchors, and discloses a construction method of an anti-floating anchor, which aims to solve the problems of high construction period and high construction cost caused by easy falling and hole crossing when an anchor hole is drilled by a percussion drill. The invention comprises the following steps: (1) The method comprises the steps of (1) measuring and paying off, and determining the positions of all anti-floating anchor rods, wherein a long spiral drilling machine is used for clamping a grouting flower pipe and driving the grouting flower pipe to rotate to drill to form anchor holes, and a plurality of grouting holes are formed in the circumferential wall of the grouting flower pipe; (3) And (3) injecting cement slurry into the grouting floral tube, and forming grouting body which is mutually connected with the grouting floral tube after the cement slurry is solidified, so that the construction of the anti-floating anchor rod is completed. The invention avoids the problems of drill falling and hole crossing, and can improve the construction efficiency of the anti-floating anchor rod, thereby reducing the construction cost of the anti-floating anchor rod; simultaneously can also improve the compactness that anti-floating anchor pole and slip casting body are connected for stock and slip casting body wholeness are better, improve the resistance to plucking ability of anti-floating anchor pole.
Description
Technical Field
The invention belongs to the technical field of anti-floating anchors, and particularly relates to a construction method of an anti-floating anchor.
Background
The anti-floating anchor rod is one kind of anti-floating measure for underground structure in building engineering. The anti-floating anchor rod refers to a structural member which is arranged against the upward displacement of a building on the anti-floating anchor rod, and is related to the height and the change condition of the underground water level and is opposite to the stress direction of the anti-floating pile.
The anti-floating anchor rod comprises a common anti-floating anchor rod and an enlarged head anti-floating anchor rod, wherein the common anti-floating anchor rod comprises an anchor hole formed in a soil body, an anchor rod buried in the anchor hole and a grouting body for filling the anchor hole and the anchor rod; the anchor rod comprises anchor rod reinforcing steel bars and grouting pipes surrounded by the anchor rod reinforcing steel bars, and a centering bracket is arranged in the anchor hole for positioning conveniently, and the contact area of the anchor rod structure and a rock-soil body is small because the diameters of the whole anchor holes are consistent, so that the binding force of the anchor rod structure and the rock-soil body is low; in order to increase the binding force between the anchor rod structure and the rock-soil body, a mode of increasing the length of the anchor rod is generally adopted; however, the stress concentration phenomenon exists in the anchor rod, so that the adhesive force is slightly increased after the anchor rod exceeds a certain length.
In order to improve the anti-floating capacity of the anti-floating anchor rod, an enlarged head anti-floating anchor rod appears, and the biggest difference between the enlarged head anti-floating anchor rod and the common anti-floating anchor rod is as follows: an enlarged head is arranged at the bottom of the anchor hole, and an enlarged head section is formed at the bottom of the anchor hole after pouring is completed, so that the anti-pulling capacity of the anti-floating anchor rod is improved. For example, a bottom-expanding prestress anti-floating anchor disclosed in patent application number 201220060959.0 comprises a metal corrugated pipe penetrating through a waterproof bottom plate, wherein the metal corrugated pipe extends into the lower end part of an anchor rod hole at the lower part of the waterproof bottom plate, and the lower end part of the anchor rod hole is a rod end expansion head; a steel sleeve is pre-buried outside the metal corrugated pipe in the waterproof bottom plate; steel strands penetrate through the metal corrugated pipe, the upper ends of the steel strands are fixed on the anchor, the lower ends of the steel strands are anchored on an anchor plate in the rod end expansion head, and the anchor plate is arranged on the anchor head; and a secondary grouting guide pipe is arranged between the metal corrugated pipe and the steel sleeve.
The construction process of the anti-floating anchor rod mainly comprises the following steps: anchor rod processing and assembling, drilling, anchor rod inserting, grouting, curing and anchor rod anti-floating capability detection. In which the anchor drilling needs to pass through the cover layer (free section) to reach the stabilizing layer (anchor section) during the drilling process, the drilling of the anchor hole is generally performed by using a percussion drill. However, when the anchor hole is drilled, the drill falling situation often occurs, the drill pulling operation (i.e. re-extracting the drill sleeve) is generally required, and the time spent for the drill pulling operation is quite long; if the drag-and-drop drilling is unsuccessful, the drilling can only be re-performed. Therefore, once the drill is dropped, the construction period is greatly prolonged, and the construction cost is increased.
Meanwhile, when drilling is carried out by using a percussion drill, the problem of hole collapse often occurs.
Disclosure of Invention
The invention provides a construction method of an anti-floating anchor rod, which aims to solve the problems of high construction period and high construction cost caused by falling off and crossing of a hole when an anchor hole is drilled by a percussion drill, avoids the problems of falling off and crossing of the hole, and can greatly improve the construction efficiency of the anti-floating anchor rod, thereby reducing the construction cost of the anti-floating anchor rod; simultaneously can also improve the compactness that anti-floating anchor pole and slip casting body are connected for stock and slip casting body wholeness are better, improve the resistance to plucking ability of anti-floating anchor pole.
In order to solve the technical problems, the invention adopts the following technical scheme:
the construction method of the anti-floating anchor rod is characterized by comprising the following steps:
(1) Measuring and paying off, and determining the position of each anti-floating anchor rod;
(2) Clamping a grouting flower pipe by using a long spiral drilling machine and driving the grouting flower pipe to rotate to drill so as to form anchor holes, wherein a plurality of grouting holes are formed in the circumferential wall of the grouting flower pipe;
(3) And (3) injecting cement slurry into the grouting floral tube, and forming grouting body which is mutually connected with the grouting floral tube after the cement slurry is solidified, so that the construction of the anti-floating anchor rod is completed.
In some embodiments, the lower section of the grouting flower pipe is provided with a spiral blade in a spiral shape, the periphery of the grouting flower pipe above the spiral blade is uniformly provided with a plurality of reinforcing strips, the reinforcing strips are provided with grooves with the cross sections in a convex shape, a plurality of cutting blades which are arranged at intervals are arranged in the grooves, and the length of the cutting blades extending out of the grouting flower pipe is larger than that of the spiral blades extending out of the grouting flower pipe.
In some embodiments, the cutting blades include a variable diameter section cutting blade and an equal diameter section cutting blade, the variable diameter section cutting blade being located between the helical blade and the equal diameter section cutting blade, the variable diameter section cutting blade increasing in length out of the grouting flower in a direction from the helical blade to the equal diameter section cutting blade.
In some embodiments, the cutting blade includes a blade wing and a connecting portion that is mutually adapted to the groove of the reinforcing strip, the inner wall of the groove being provided with an elastic locking pin, and the connecting portion being provided with a pin hole that is mutually adapted to the elastic locking pin.
In some embodiments, when the long spiral drilling machine drives the grouting flower pipe to complete anchor hole drilling, a push rod is inserted into the groove of the reinforcing strip so as to push the cutting blade, so that a pin hole on the cutting blade and an elastic locking pin in the groove are mutually separated, and the cutting blade can slide downwards in the groove of the reinforcing strip.
In some embodiments, a positioning rod is also connected to the lower end of the connecting portion, so that the spacing between the upper and lower adjacent cutting blades is the same when the cutting blades slide in the grooves.
Compared with the prior art, the invention has the following beneficial effects:
according to the construction method of the anti-floating anchor rod, the long screw rod drilling machine drives the grouting flower pipe to rotate when in operation, so that the spiral blade at the lower section of the grouting flower pipe is used for drilling, then the cutting blade is used for cutting, drilling and reaming, so that anchor holes are formed, and then the pin shaft holes on the cutting blade and the elastic locking pins on the reinforcing strip are mutually separated, so that each cutting blade slides downwards, and each cutting blade is positioned at the lower section of the grouting flower pipe; and then, injecting cement paste into the grouting flower pipe for grouting, and injecting the cement paste from each grouting hole of the grouting flower pipe to fill the anchor holes, wherein the grouting body is formed after the cement paste is solidified, so that the construction of the anti-floating anchor rod is completed. Compared with the prior art that an anchor hole is drilled by a percussion drill, the method and the device directly drill by using the grouting pipe, and the grouting pipe always supports the anchor hole, so that the condition of drill falling is avoided, the construction efficiency is improved, and the construction cost is reduced; meanwhile, the disturbance effect on soil is reduced, and the anchor hole wall can be supported by the cutting blade, so that the problem of hole collapse is reduced.
The invention reduces the working procedures of extracting the drill bit and putting the anchor rod, and further improves the construction efficiency of the anti-floating anchor rod.
The invention uses the spiral blade to play a main role in cutting and drilling, and uses the cutting blade to play a role in reaming, and the cutting blade also plays a role in centralizing and positioning, so that the grouting pipe is positioned at the central position of the anchor hole, and a centering bracket is not required to be installed; and when the cutting blade slides to the lower section of the grouting flower pipe, the cutting blade can also mention the effect of the bearing plate, so that the compactness of bonding with the grouting body is improved, the grouting flower pipe and the grouting body form an organic whole, and the anti-pulling capacity of the anti-floating anchor rod is improved.
According to the invention, the drilling of the anchor hole is realized by utilizing the combined action of the spiral blade and the cutting blade, so that enough space is reserved between the wall of the anchor hole and the grouting flower pipe, the connection tightness between the grouting body formed by pouring and the soil body and the grouting flower pipe is ensured to be better, the integrity of the anti-floating anchor rod and the soil body is higher, and the effect of improving the anti-pulling capacity of the anti-floating anchor rod is achieved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic top view of the grouting pipe according to the present invention;
FIG. 3 is a schematic view of the structure of the present invention after the cutting blade on the pipe falls;
the marks in the figure: 1. the grouting pipe comprises a grouting pipe body, 2, grouting holes, 3, spiral blades, 4, reinforcing strips, 41, grooves, 42, elastic locking pins, 5, cutting blades, 51, a variable-diameter section cutting blade, 52 and an equal-diameter section cutting blade.
Description of the embodiments
The present invention is further described below in conjunction with embodiments, which are merely some, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments that may be used by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The construction method of the anti-floating anchor rod of the invention comprises the following steps of:
(1) Measuring and paying-off to determine the position of each anti-floating anchor rod, wherein the position of each anti-floating anchor rod is determined by measuring and paying-off belongs to the prior art, and can be understood and appreciated by those skilled in the art, and the detailed description is omitted herein;
(2) The grouting pipe is clamped by a long spiral drilling machine and driven to rotate to drill to form anchor holes, and a plurality of grouting holes 2 are formed in the circumferential wall of the grouting pipe 1; wherein the upper part of the grouting pipe 1 is provided with a connecting part which is used for being connected with a long spiral drilling machine, and in some embodiments, the grouting pipe 1 is detachably connected with the long spiral drilling machine through threads; in some embodiments, the upper part of the grouting pipe 1 is connected with the long spiral drilling machine in a clamping manner, for example, the upper section of the grouting pipe 1 is designed to be square, regular pentagon or regular hexagon, and the connection with the long spiral drilling machine is directly realized in a clamping manner, so that the long spiral drilling machine is utilized to drive the grouting pipe to rotate;
(3) And (3) injecting cement slurry into the grouting floral tube, and forming grouting body which is mutually connected with the grouting floral tube after the cement slurry is solidified, so that the construction of the anti-floating anchor rod is completed. That is, the grouting pipe is directly used as the anchor rod body of the anti-floating anchor rod, so that two working procedures of drilling and dropping an anchor hole in the prior art are integrated, the construction period is shortened, and the problems of drill falling and hole collapse occurring when the impact drill is used for forming the hole are mainly avoided, so that the purposes of improving the construction efficiency and reducing the construction cost are achieved.
In some embodiments, the lower section of the grouting pipe 1 is provided with a spiral blade 3 in a spiral shape, the periphery of the grouting pipe 1 above the spiral blade 3 is uniformly provided with a plurality of reinforcing strips 4, the reinforcing strips 4 are provided with grooves 41 with the cross sections in a shape of a Chinese character 'tu', a plurality of cutting blades 5 arranged at intervals are arranged in the grooves 41, and the length of the cutting blades 5 extending out of the grouting pipe 1 is greater than that of the spiral blade 3 extending out of the grouting pipe 1. That is, the inner diameter of the anchor hole formed when the cutting blade rotates is larger than the inner diameter of the anchor hole formed when the screw blade rotates. Therefore, the variable-diameter section cutting blade and the equal-diameter section cutting blade are used for cutting, and the anchor hole drilling efficiency is improved.
Preferably, 3 reinforcing strips 4 or 4 reinforcing strips 4 are arranged on the periphery of the grouting floral tube 1, and the cutting blades 5 on each reinforcing strip 4 form a spiral shape, that is, the mounting heights of the cutting blades 5 on each reinforcing strip 4 are different and are distributed according to the direction of the spiral line, so that the cutting blades 5 on each reinforcing strip 4 are distributed in a spiral shape as a whole. Thereby facilitating drilling with the cutting blade 5.
In some embodiments, the cutting blades 5 comprise a variable diameter section cutting blade 51 and an equal diameter section cutting blade 52, the variable diameter section cutting blade 51 being located between the spiral blade 3 and the equal diameter section cutting blade 52, the length of the variable diameter section cutting blade extending out of the grouting flower pipe gradually increasing along the direction from the spiral blade to the equal diameter section cutting blade. That is, the lengths of the cutting blades extending out of the grouting flower pipe from bottom to top of the cutting blades of the reducing section are gradually increased, so that the reaming is gradually performed by using the cutting blades of the reducing section.
In some embodiments, the cutting blade comprises a blade wing and a connecting portion, the connecting portion is mutually matched with the groove 41 of the reinforcing strip, the inner wall of the groove 41 is provided with an elastic locking pin 42, and the connecting portion is provided with a pin hole mutually matched with the elastic locking pin. The cutting blade is evenly distributed on the periphery of the grouting pipe pattern 1 when the cutting blade 5 is needed to be used as a bearing plate (bearing plate), the cutting blade can be lowered to the lower section of the grouting pipe pattern 1 (namely the anchoring section of the anti-floating anchor rod), and the tightness of connection with a grouting body is improved by using the cutting blade.
In some embodiments, when the long auger drilling machine drives the grouting pipe 1 to complete anchor hole drilling, a push rod is inserted into the groove 41 of the reinforcing bar 4 so as to push the cutting blade 5, so that the pin hole on the cutting blade 5 and the elastic locking pin 42 in the groove 41 are separated from each other, and the cutting blade 5 can slide downwards in the groove of the reinforcing bar. Wherein the push rod serves as an auxiliary tool for inserting into the recess 41 and pressing down the cutting blade down to the lower section of the grouting pipe 1.
In some embodiments, a positioning rod is also connected to the lower end of the connecting portion, so that the distance between the upper and lower adjacent cutting blades is the same when the cutting blade 5 slides in the groove. That is, the lower end of each cutting blade 5 is connected with a positioning rod by which the interval between the upper and lower adjacent cutting blades 5 is maintained, so that the cutting blades can be uniformly distributed when they fall to the lower section of the slip casting pipe 1, thereby enabling the respective cutting blades 5 to be uniformly stressed as a bearing plate.
According to the construction method of the anti-floating anchor rod, the long screw rod drilling machine drives the grouting flower pipe to rotate when in operation, so that the spiral blade at the lower section of the grouting flower pipe is used for drilling, then the cutting blade is used for cutting, drilling and reaming, so that anchor holes are formed, and then the pin shaft holes on the cutting blade and the elastic locking pins on the reinforcing strip are mutually separated, so that each cutting blade slides downwards, and each cutting blade is positioned at the lower section of the grouting flower pipe; and then, injecting cement paste into the grouting flower pipe for grouting, and injecting the cement paste from each grouting hole of the grouting flower pipe to fill the anchor holes, wherein the grouting body is formed after the cement paste is solidified, so that the construction of the anti-floating anchor rod is completed. Compared with the prior art that an anchor hole is drilled by a percussion drill, the method and the device directly drill by using the grouting pipe, and the grouting pipe always supports the anchor hole, so that the condition of drill falling is avoided, the construction efficiency is improved, and the construction cost is reduced; meanwhile, the disturbance effect on soil is reduced, and the anchor hole wall can be supported by the cutting blade, so that the problem of hole collapse is reduced.
The invention reduces the working procedures of extracting the drill bit and putting the anchor rod, and further improves the construction efficiency of the anti-floating anchor rod.
The invention uses the spiral blade to play a main role in cutting and drilling, and uses the cutting blade to play a role in reaming, and the cutting blade also plays a role in centralizing and positioning, so that the grouting pipe is positioned at the central position of the anchor hole, and a centering bracket is not required to be installed; and when the cutting blade slides to the lower section of the grouting flower pipe, the cutting blade can also mention the effect of the bearing plate, so that the compactness of bonding with the grouting body is improved, the grouting flower pipe and the grouting body form an organic whole, and the anti-pulling capacity of the anti-floating anchor rod is improved.
According to the invention, the drilling of the anchor hole is realized by utilizing the combined action of the spiral blade and the cutting blade, so that enough space is reserved between the wall of the anchor hole and the grouting flower pipe, the connection tightness between the grouting body formed by pouring and the soil body and the grouting flower pipe is ensured to be better, the integrity of the anti-floating anchor rod and the soil body is higher, and the effect of improving the anti-pulling capacity of the anti-floating anchor rod is achieved.
In the prior art, for example, patent application number CN201921938264.6 discloses a prefabricated self-drilling screw anti-floating anchor, which is provided with spiral fins at the lower section of the anchor, the inner diameter of the anchor hole is the same as the outer diameter of the spiral fins by drilling the spiral fins, but because the distance between the inner diameter of the anchor hole and the anchor pipe body is only the length of the spiral fins extending out of the anchor pipe body, the filling range of cement slurry in the anchor hole is only the distance between the outer wall of the anchor pipe body and the spiral fins (the area in the anchor pipe body is removed), so that the section size of the grouting body (i.e. the solidified cement slurry) is smaller, the soil body combining capacity of the grouting body and the peripheral wall of the anchor hole is poorer, and the anti-pulling capacity of the anti-floating anchor is poorer. If the size of the spiral fin is increased to increase the distance between the anchor pipe body and the anchor hole, although the acting force of the combination of the grouting body and the soil body can be increased, the drilling efficiency is low due to the fact that the size of the spiral fin is too large (namely, the anchor hole with larger size is drilled at one time, and the drilling efficiency is low). According to the invention, the spiral blade is used for carrying out primary drilling, and the cutting blade is used for carrying out secondary drilling, so that a sufficient space is reserved between the grouting pipe (namely the anchor body of the anti-floating anchor) and the anchor hole to fill the grouting body, the compactness of the combination of the grouting body and the soil body is ensured, and meanwhile, the drilling efficiency of the anchor hole is improved; and simultaneously, the tightness of connection between the grouting floral tube and the grouting body can be improved by utilizing the cutting blade. In summary, the invention can improve the drilling efficiency, and simultaneously improve the integrity of the anti-floating anchor rod and the soil body and the compactness between the grouting pipe and the grouting body, thereby achieving the purpose of improving the anti-pulling capacity of the anti-floating anchor rod.
Claims (3)
1. The construction method of the anti-floating anchor rod is characterized by comprising the following steps:
(1) Measuring and paying off, and determining the position of each anti-floating anchor rod;
(2) Clamping a grouting flower pipe by using a long spiral drilling machine and driving the grouting flower pipe to rotate to drill so as to form anchor holes, wherein a plurality of grouting holes are formed in the circumferential wall of the grouting flower pipe;
(3) Injecting cement paste into the grouting floral tube, and forming grouting body which is mutually connected with the grouting floral tube after the cement paste is solidified so as to finish the construction of the anti-floating anchor rod;
the lower section of the grouting flower pipe is provided with a spiral blade, the periphery of the grouting flower pipe above the spiral blade is uniformly provided with a plurality of reinforcing strips, the reinforcing strips are provided with grooves with the cross sections in a convex shape, a plurality of cutting blades which are arranged at intervals are arranged in the grooves, and the length of the cutting blades extending out of the grouting flower pipe is larger than that of the cutting blades extending out of the grouting flower pipe; the cutting blade comprises a blade and a connecting part, the connecting part is mutually matched with the groove of the reinforcing strip, an elastic locking pin is arranged on the inner wall of the groove, and a pin hole which is mutually matched with the elastic locking pin is formed in the connecting part; when the long spiral drilling machine drives the grouting pipe to complete anchor hole drilling, the push rod is inserted into the groove of the reinforcing strip so as to push the cutting blade, so that the pin hole on the cutting blade and the elastic locking pin in the groove are mutually separated, and the cutting blade can slide downwards in the groove of the reinforcing strip.
2. A method of constructing an anti-floating bolt according to claim 1, wherein the cutting blades include a variable diameter section cutting blade and an equal diameter section cutting blade, the variable diameter section cutting blade being located between the helical blade and the equal diameter section cutting blade, the length of the variable diameter section cutting blade extending out of the grouting pipe increasing in the direction from the helical blade to the equal diameter section cutting blade.
3. A construction method of an anti-floating bolt according to claim 1, wherein the lower end of the connecting portion is further connected with a positioning rod so that the interval between the upper and lower adjacent cutting blades is the same when the cutting blades slide in the grooves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210007425.XA CN114319342B (en) | 2022-01-06 | 2022-01-06 | Construction method of anti-floating anchor rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210007425.XA CN114319342B (en) | 2022-01-06 | 2022-01-06 | Construction method of anti-floating anchor rod |
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| CN114319342A CN114319342A (en) | 2022-04-12 |
| CN114319342B true CN114319342B (en) | 2023-08-11 |
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| CN1106096A (en) * | 1994-01-28 | 1995-08-02 | 冶金工业部沈阳勘察研究院 | Pipe anchor rod technology and its anchor rod |
| CN102587366A (en) * | 2012-03-13 | 2012-07-18 | 胜利油田胜利工程建设（集团）有限责任公司 | Self-drilling type spiral anchor rod and construction process using self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing |
| CN104141305A (en) * | 2014-07-30 | 2014-11-12 | 武汉武大巨成结构股份有限公司 | Multi-layer spiral blade self-drilling-type soil anchor rod and constructing method thereof |
| CN104453717A (en) * | 2014-11-26 | 2015-03-25 | 山东正元建设工程有限责任公司 | Long auger drilling and bottom expanding device and expanded anchor rod construction method |
| CN110714488A (en) * | 2019-11-11 | 2020-01-21 | 中国建筑西南勘察设计研究院有限公司 | Prefabricated self-drilling screw anti-floating anchor rod |
| CN112576292A (en) * | 2021-01-04 | 2021-03-30 | 贵州大学 | Prestressed hollow grouting anchor rod and construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050039952A1 (en) * | 2003-08-20 | 2005-02-24 | Hill John L. | Drilling apparatus, method, and system |
-
2022
- 2022-01-06 CN CN202210007425.XA patent/CN114319342B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106096A (en) * | 1994-01-28 | 1995-08-02 | 冶金工业部沈阳勘察研究院 | Pipe anchor rod technology and its anchor rod |
| CN102587366A (en) * | 2012-03-13 | 2012-07-18 | 胜利油田胜利工程建设（集团）有限责任公司 | Self-drilling type spiral anchor rod and construction process using self-drilling type spiral anchor rod for grouting along with drilling, stirring and curing |
| CN104141305A (en) * | 2014-07-30 | 2014-11-12 | 武汉武大巨成结构股份有限公司 | Multi-layer spiral blade self-drilling-type soil anchor rod and constructing method thereof |
| CN104453717A (en) * | 2014-11-26 | 2015-03-25 | 山东正元建设工程有限责任公司 | Long auger drilling and bottom expanding device and expanded anchor rod construction method |
| CN110714488A (en) * | 2019-11-11 | 2020-01-21 | 中国建筑西南勘察设计研究院有限公司 | Prefabricated self-drilling screw anti-floating anchor rod |
| CN112576292A (en) * | 2021-01-04 | 2021-03-30 | 贵州大学 | Prestressed hollow grouting anchor rod and construction method |
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