CN110593260A - Self-drilling type pre-stressed anchoring head and construction method thereof - Google Patents
Self-drilling type pre-stressed anchoring head and construction method thereof Download PDFInfo
- Publication number
- CN110593260A CN110593260A CN201910963508.4A CN201910963508A CN110593260A CN 110593260 A CN110593260 A CN 110593260A CN 201910963508 A CN201910963508 A CN 201910963508A CN 110593260 A CN110593260 A CN 110593260A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- drilling
- self
- clamping piece
- anchor
- Prior art date
- 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.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 50
- 238000004873 anchoring Methods 0.000 title claims abstract description 20
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Earth Drilling (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a self-drilling type prestressed anchoring head and a construction method thereof. Compared with the prior art, the invention has the advantages that: the invention provides an anchoring head for a self-drilling type pre-stressed anchor rod, which can effectively combine a drill rod and the pre-stressed anchor rod and has the functions of the self-drilling type anchor rod and the pre-stressed anchor rod; by adopting the anchoring head, the anchor hole does not need to be drilled in advance during construction, and drilling, pre-tightening and grouting can be integrated; by adopting the anchoring head, the equipment is reduced during construction, and the construction efficiency is greatly improved.
Description
Technical Field
The invention relates to a self-drilling type pre-stressed anchoring head and a construction method thereof.
Background
With the continuous improvement of market requirements on the service life of constructional engineering, the usage amount of prestressed anchor rods for reinforcing surrounding rocks in underground engineering such as tunnels, side slopes, foundations, bridges and the like is gradually increased, however, in the traditional prestressed anchor rod construction, the anchor holes need to be drilled manually or mechanically, then the anchor holes are cleaned by high-pressure water, anchor rods are put in, the anchor rods are pre-tightened, grouting and other process flows are performed, in the process, the drill rod for drilling and the drill rod need to be repeatedly switched with the prestressed anchor rods, the construction efficiency is low, and the waste amount of the drill rod and the drill rod is large. These problems directly affect the speed and cost of construction.
In order to change the situation, the self-drilling type prestressed anchor rod optimizes and combines the functions of the drilling tool and the prestressed anchor rod, so that the anchor rod can be used as the drilling tool to drill an anchor hole and can be quickly pre-tightened after being drilled to a set depth to achieve the function of the prestressed anchor rod. The part of the self-drilling prestressed anchor rod for realizing the function is an anchoring head. Therefore, the invention provides an anchoring head for a self-drilling type pre-stressed anchor rod and a construction method thereof.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a self-drilling type pre-stressed anchoring head and a construction method thereof.
The technical scheme of the invention is as follows: a self-drilling type prestressed anchoring head comprises a drill bit, and a shell expansion clamping piece and a torsional spring which are installed on the drill bit, wherein a hole for water outlet and grouting is formed in the top end of the drill bit, a shell expansion clamping piece installing groove is formed in the side face of the drill bit, the shell expansion clamping piece is arranged in the shell expansion clamping piece installing groove, the torsional spring is installed on the shell expansion clamping piece, and a threaded hole matched with an anchor rod is formed in the drill bit.
Furthermore, the outer part of the shell expansion clamping piece is an arc surface, and oblique teeth are arranged on the arc surface.
Furthermore, an inclined chamfer is arranged on the side surface of the shell expansion clamping piece.
Furthermore, the torsion spring is a spiral spring, and the included angle of the two spring feet is an acute angle.
Furthermore, the two spring feet are provided with a section of cylindrical part.
Further, the drill bit is a cross-tooth drill bit.
Further, a cross-tooth cutting edge is provided on the cross-tooth drill.
Furthermore, the drill bit is a spherical tooth drill bit, and spherical teeth for crushing surrounding rocks are arranged at the top end of the drill bit.
Furthermore, a water outlet hole and a grouting hole are arranged in the groove on the side surface of the spherical tooth drill bit.
The invention also discloses a construction method of the self-drilling type pre-stressed anchor head, which comprises the following steps:
firstly, before drilling:
1) mounting the expansion shell clamping piece and the torsion spring on the drill bit through a shaft;
2) then sleeving a plastic ring on the assembled self-drilling type prestressed anchor;
3) then the anchor rod body is connected with the anchor head through threads;
secondly, drilling:
1) when the drill bit just drills into a rock hole, broken stones impact the plastic ring, the torsion spring is pressed down, the plastic ring falls off, and the drill bit enters surrounding rock;
2) after the drill bit enters the surrounding rock, the hole wall presses the shell expansion clamping piece, and the shell expansion clamping piece is always in contact with the rock wall of the anchor hole in the drilling process under the action of the torsion spring;
thirdly, pre-tightening process:
1) after the drill bit drills to a set depth, the broken silt in the anchor hole is flushed out by high-pressure water;
2) pulling the rod body outwards, turning the shell expansion clamping piece outwards in the anchor hole, and embedding the shell expansion clamping piece into the anchor hole surrounding rock;
3) a grout stop plug, a backing plate and a nut are sequentially arranged on the anchor rod body;
4) and (5) rotating the nut to complete the pre-tightening of the anchor rod.
Compared with the prior art, the invention has the advantages that: the invention provides an anchoring head for a self-drilling type pre-stressed anchor rod, which can effectively combine a drill rod and the pre-stressed anchor rod and has the functions of the self-drilling type anchor rod and the pre-stressed anchor rod; by adopting the anchoring head, the anchor hole does not need to be drilled in advance during construction, and drilling, pre-tightening and grouting can be integrated; by adopting the anchoring head, the equipment is reduced during construction, and the construction efficiency is greatly improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a Phillips bit according to a first embodiment of the present invention;
FIG. 3 is a front view of the expanding shell clip of the present invention;
FIG. 4 is a side view of the expanding shell clip of the present invention;
FIG. 5 is a schematic structural view of the torsion spring of the present invention
FIG. 6 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a button bit according to a second embodiment of the present invention;
FIG. 8 is a schematic view of the present invention assembled prior to drilling;
FIG. 9 is a schematic view of a drilling process;
fig. 10 is a schematic illustration of the pretensioning process.
Detailed Description
The first embodiment is as follows: cross tooth self-drilling type pre-stressed anchoring head
As shown in fig. 1, the cross-tooth self-drilling prestressed anchoring head comprises: a cross tooth drill bit 1, a shell expanding clamping piece 2, a water outlet or grouting hole 3 and the like.
As shown in fig. 2, the cross-tooth drill includes: the cross tooth cutting edge 11, the shell expansion clamping piece mounting grooves 12, the shaft holes 13 and the like are arranged at the top ends of the cross tooth cutting edge, water outlet and grouting holes are formed in the top ends of the shell expansion clamping piece mounting grooves, the shell expansion clamping pieces are arranged in the shell expansion clamping piece mounting grooves, the shaft holes are formed in two sides of each groove, and the shell expansion clamping pieces are mounted on a drill bit through shafts. And a threaded hole matched with the anchor rod is arranged in the cross-shaped tooth drill bit.
As shown in fig. 3 and 4, the expanding-shell clip includes: the device comprises a torsion spring mounting groove 21, oblique teeth 22, an oblique chamfer 23, a shaft hole 24 and the like, wherein the torsion spring mounting groove 21 is an oblique groove formed in the middle and used for mounting a torsion spring; the shaft hole 24 is arranged on the side surface and is used for being connected with a drill bit; the outer part of the expansion shell clamping piece is an arc surface, and the arc surface is provided with oblique teeth 22; the side surface of the shell expansion clamping piece is provided with an inclined chamfer 23.
The structure of the torsion spring is shown in fig. 5, and the torsion spring is a spiral spring, the spring feet 31 at two ends are respectively provided with a section of cylindrical part, and the clamping feet of the two spring feet are acute angles and are arranged in the groove of the clamping piece of the expansion shell.
Example two: self-drilling type prestressed anchor head with spherical teeth
As shown in fig. 6, includes: the expansion shell clamping piece 2, the water outlet and grouting hole 3, the spherical tooth drill bit 4 and the like.
As shown in fig. 7, the button bit comprises: button 41, the shell that rises clip mounting groove 42, shaft hole 43 etc. wherein: the top end of the spherical tooth drill bit is provided with spherical teeth 41 used for breaking surrounding rocks, water outlet holes and grouting holes are formed in grooves in the top end and the side face of the spherical tooth drill bit, an expansion shell clamping piece mounting groove is formed in the side face of the spherical tooth drill bit, shaft holes 43 are formed in two sides of each groove, the expansion shell clamping pieces are mounted on the drill bit through shafts, and threaded holes matched with anchor rods are formed in the spherical tooth drill bit.
The assembled anchoring head has the advantage that the outer diameter of the outer teeth of the clamping pieces is slightly larger than the maximum diameter of the drill bit because the shell-expanding clamping pieces 2 are in a half-open state (as shown in figures 1 and 6) under the action of the torsion spring.
The invention also discloses a construction method of the self-drilling type pre-stressed anchor head, which comprises the following steps:
as shown in fig. 8, before drilling:
1) mounting the expansion shell clamping piece and the torsion spring on the drill bit through a shaft;
2) then sleeving a plastic ring 5 on the assembled self-drilling type prestressed anchor;
3) and then the anchor rod body is connected with the anchor head through threads.
As shown in fig. 9, the drilling process:
1) when the drill bit just drills into a rock hole, broken stones impact the plastic ring 5, the torsion spring is pressed down, the plastic ring 5 falls off, and the drill bit enters surrounding rocks;
2) when the drill bit enters the surrounding rock, the hole wall presses the shell expansion clamping piece, but under the action of the torsion spring, the shell expansion clamping piece tends to turn outwards, so that the shell expansion clamping piece is always in contact with the rock wall of the anchor hole in the drilling process.
As shown in fig. 10, the pretensioning process:
1) after the drill bit drills to a set depth, the broken silt in the anchor hole is flushed out by high-pressure water;
2) pulling the rod body outwards, turning the shell expansion clamping piece outwards in the anchor hole, and embedding the shell expansion clamping piece into the surrounding rock of the anchor hole;
3) a grout stop plug, a backing plate and a nut are sequentially arranged on the anchor rod body;
4) and (5) rotating the nut to complete the pre-tightening of the anchor rod.
The above drawings (fig. 8 to 10) illustrate the cross-tooth self-drilling type pre-stressed anchor head, and the same applies to the ball-tooth self-drilling type pre-stressed anchor head.
Claims (10)
1. A self-drilling prestressed anchorage head is characterized in that: the drilling tool comprises a drill bit, and a shell expansion clamping piece and a torsion spring which are installed on the drill bit, wherein a hole for water outlet and grouting is formed in the top end of the drill bit, a shell expansion clamping piece installing groove is formed in the side face of the drill bit, the shell expansion clamping piece is arranged in the shell expansion clamping piece installing groove, the torsion spring is installed on the shell expansion clamping piece, and a threaded hole matched with an anchor rod is formed in the drill bit.
2. The self-drilling prestressed anchorage head of claim 1, characterized in that: the outer part of the expansion shell clamping piece is an arc surface, and oblique teeth are arranged on the arc surface.
3. The self-drilling prestressed anchorage head of claim 1, characterized in that: and an inclined chamfer is arranged on the side surface of the shell expansion clamping piece.
4. The self-drilling prestressed anchorage head of claim 1, characterized in that: the torsion spring is a spiral spring, and the included angle of the two spring feet is an acute angle.
5. The self-drilling prestressed anchoring head according to claim 4, characterized in that: the two spring feet are both provided with a section of cylindrical part.
6. The self-drilling prestressed anchorage head of claim 1, characterized in that: the drill bit is a cross-tooth drill bit.
7. A self-drilling pre-stressed anchoring head according to claim 6, characterized in that: the cross-tooth drill bit is provided with a cross-tooth cutting edge.
8. The self-drilling prestressed anchorage head of claim 1, characterized in that: the drill bit is a spherical tooth drill bit, and spherical teeth used for crushing surrounding rocks are arranged at the top end of the drill bit.
9. The self-drilling prestressed anchoring head according to claim 8, characterized in that: and a water outlet hole and a grouting hole are arranged in the groove on the side surface of the spherical tooth drill bit.
10. A construction method of a self-drilling type pre-stressed anchor head is characterized by comprising the following steps: the method comprises the following steps:
firstly, before drilling:
1) mounting the expansion shell clamping piece and the torsion spring on the drill bit through a shaft;
2) then sleeving a plastic ring on the assembled self-drilling type prestressed anchor;
3) then the anchor rod body is connected with the anchor head through threads;
secondly, drilling:
1) when the drill bit just drills into a rock hole, broken stones impact the plastic ring, the torsion spring is pressed down, the plastic ring falls off, and the drill bit enters surrounding rock;
2) after the drill bit enters the surrounding rock, the hole wall presses the shell expansion clamping piece, and the shell expansion clamping piece is always in contact with the rock wall of the anchor hole in the drilling process under the action of the torsion spring;
thirdly, pre-tightening process:
1) after the drill bit drills to a set depth, the broken silt in the anchor hole is flushed out by high-pressure water;
2) pulling the rod body outwards, turning the shell expansion clamping piece outwards in the anchor hole, and embedding the shell expansion clamping piece into the anchor hole surrounding rock;
3) a grout stop plug, a backing plate and a nut are sequentially arranged on the anchor rod body;
4) and (5) rotating the nut to complete the pre-tightening of the anchor rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910963508.4A CN110593260A (en) | 2019-10-11 | 2019-10-11 | Self-drilling type pre-stressed anchoring head and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910963508.4A CN110593260A (en) | 2019-10-11 | 2019-10-11 | Self-drilling type pre-stressed anchoring head and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110593260A true CN110593260A (en) | 2019-12-20 |
Family
ID=68866574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910963508.4A Pending CN110593260A (en) | 2019-10-11 | 2019-10-11 | Self-drilling type pre-stressed anchoring head and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110593260A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669090A (en) * | 2021-08-23 | 2021-11-19 | 中建八局发展建设有限公司 | Anchor rod construction process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130016547A (en) * | 2011-08-08 | 2013-02-18 | 김유신 | Anchor for rock bolt |
| CN204299597U (en) * | 2014-11-13 | 2015-04-29 | 罗宗帆 | The self-expanding anchor pole of rotation |
| CN106121695A (en) * | 2016-07-29 | 2016-11-16 | 安徽理工大学 | A kind of self-drilling type swollen shell automatic clamping hollow grouting anchor |
| CN107559032A (en) * | 2017-10-30 | 2018-01-09 | 洛阳工岩科技有限公司 | Aerofoil profile two dimension prestressing anchor drilling rod |
| CN207297057U (en) * | 2017-10-27 | 2018-05-01 | 四川路桥盛通建筑工程有限公司 | It is a kind of have the function of from into scissors grouted anchor bar |
| CN207513556U (en) * | 2017-10-25 | 2018-06-19 | 洛阳工岩科技有限公司 | A kind of lock scissors anchor drill bit |
| CN208858295U (en) * | 2018-08-01 | 2019-05-14 | 洛阳恒诺锚固技术有限公司 | The button bit and self-drilling type anchor system of coating button protrusion |
| CN211006659U (en) * | 2019-10-11 | 2020-07-14 | 中铁隆昌铁路器材有限公司 | Self-drilling type prestressed anchoring head |
-
2019
- 2019-10-11 CN CN201910963508.4A patent/CN110593260A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130016547A (en) * | 2011-08-08 | 2013-02-18 | 김유신 | Anchor for rock bolt |
| CN204299597U (en) * | 2014-11-13 | 2015-04-29 | 罗宗帆 | The self-expanding anchor pole of rotation |
| CN106121695A (en) * | 2016-07-29 | 2016-11-16 | 安徽理工大学 | A kind of self-drilling type swollen shell automatic clamping hollow grouting anchor |
| CN207513556U (en) * | 2017-10-25 | 2018-06-19 | 洛阳工岩科技有限公司 | A kind of lock scissors anchor drill bit |
| CN207297057U (en) * | 2017-10-27 | 2018-05-01 | 四川路桥盛通建筑工程有限公司 | It is a kind of have the function of from into scissors grouted anchor bar |
| CN107559032A (en) * | 2017-10-30 | 2018-01-09 | 洛阳工岩科技有限公司 | Aerofoil profile two dimension prestressing anchor drilling rod |
| CN208858295U (en) * | 2018-08-01 | 2019-05-14 | 洛阳恒诺锚固技术有限公司 | The button bit and self-drilling type anchor system of coating button protrusion |
| CN211006659U (en) * | 2019-10-11 | 2020-07-14 | 中铁隆昌铁路器材有限公司 | Self-drilling type prestressed anchoring head |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669090A (en) * | 2021-08-23 | 2021-11-19 | 中建八局发展建设有限公司 | Anchor rod construction process |
| CN113669090B (en) * | 2021-08-23 | 2023-05-02 | 中建八局发展建设有限公司 | Anchor rod construction process |
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