CN214530644U - Bonding type prestress hollow anchor rod - Google Patents
Bonding type prestress hollow anchor rod Download PDFInfo
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- CN214530644U CN214530644U CN202120144241.9U CN202120144241U CN214530644U CN 214530644 U CN214530644 U CN 214530644U CN 202120144241 U CN202120144241 U CN 202120144241U CN 214530644 U CN214530644 U CN 214530644U
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- connecting sleeve
- hollow anchor
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Abstract
The utility model provides a bonding type prestressed hollow anchor rod, belonging to the technical field of geotechnical engineering anchoring support, comprising a front rod body and a rear rod body, wherein the front rod body and the rear rod body are connected through a connecting sleeve, the front rod body and the rear rod body are both hollow rod bodies, and the outer diameter of the front rod body is larger than that of the rear rod body; the connecting sleeve is provided with a slurry blocking ring, and a slurry outlet is formed at the connecting part of the inner hole of the connecting sleeve and the cavity of the rear rod body; the rear end part of the rear rod body is matched with the supporting base plate, the nut and the washer. Utilize the utility model discloses, can improve the efficiency of construction of stock when reducing the stock cost.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering anchor is strutted, especially, relate to a bonding formula prestressing force cavity stock.
Background
In the process of underground engineering, mining engineering, foundation pit and side slope engineering related to geotechnical engineering, in order to prevent stratum from deforming, collapsing or destabilizing to endanger safety, one main supporting technology for stratum reinforcement adopts an anchor rod.
The stratum is reinforced by the high-strength tensile capacity of the anchor rod arranged in the stratum and the modes of compact combination between the anchor rod and the grouting body around the anchor rod and the stratum, and the like, so that the integrity of the stratum is improved, the deformation of the stratum is controlled, and the stratum is stabilized and safe.
In the prior art, a relatively common adhesive prestressed hollow grouting anchor rod adopts a solid rod body at the front end, and as disclosed in the chinese patent publication No. CN2561935Y, a sectional hollow grouting anchor rod is composed of a hollow rod body at the front end and a solid rod body at the rear end, the hollow rod body and the solid rod body are combined through a connecting sleeve, the connecting sleeve is provided with a grout stopper, and the hollow rod body is provided with a plurality of centralizers; a lateral pore passage is arranged at the joint of the inner hole of the connecting sleeve and the hollow rod body cavity; the support backing plate, the nut and the washer are matched with the end part of the hollow rod body. The anchor rod can ensure full grouting and uniform anchor rod protective layer, and is suitable for temporary or permanent support engineering.
In engineering application, because the bonding type prestressed hollow anchor rod is suitable for most geological conditions and is extremely large in use amount, the Chinese patent document of CN2561935Y discloses a sectional type hollow grouting anchor rod patent technology, and the problems of cost and the like are considered, a solid rod body is adopted at the front end, if the strength is equal to that of a hollow rod body at the rear end according to requirements, the outer diameter of the solid rod body is smaller than that of the hollow rod body, in one example, a solid steel bar with the diameter of phi 22 is adopted to be matched with a hollow rod body with the diameter of phi 25, the bonding type anchor rod is suitable for cement anchoring, the anchoring strength needs to be acted after a long time, and the construction efficiency is low; when the resin cartridge anchoring agent which is widely, quickly and efficiently applied in mine engineering is adopted, the stirring cartridges are insufficient due to the fact that the outer diameter of the rod body is not matched with the drilled hole, and the anchoring strength cannot be achieved. If the diameter of the solid steel bar is made too large, the cost of the anchor rod is greatly increased.
Therefore, it is necessary to design a new anchor rod for reinforcing the ground layer in consideration of the anchor rod cost and the construction efficiency.
SUMMERY OF THE UTILITY MODEL
For solving the above-mentioned problem that prior art exists, the utility model provides a bonding formula prestressing force cavity stock can improve the efficiency of construction of stock when reducing the stock cost.
The technical scheme of the utility model as follows:
a kind of cohered type prestressed hollow anchor rod, including anterior body of rod and rear body of rod, said anterior body of rod and rear body of rod pass the adapter sleeve to connect, said anterior body of rod and rear body of rod are hollow bodies of rod, the external diameter of the anterior body of rod is greater than the external diameter of the rear body of rod;
a slurry outlet hole is formed at the joint of the inner hole of the connecting sleeve and the cavity of the rear rod body; the rear end part of the rear rod body is matched with the supporting base plate, the nut and the washer.
The utility model discloses an increase the external diameter of the anterior body of rod for the stirring cartridge is more abundant, makes the anterior body of rod hollow simultaneously, makes the stock save a lot of steel materials, has reduced the cost of stock.
Preferably, the outer diameter of the front rod body is smaller than the diameter of a drill hole by 5-12 mm. At this size, the cartridge can be stirred more thoroughly.
Further, the external diameter of the anterior body of rod can be 8 ~ 12mm more than the external diameter of the posterior body of rod.
Preferably, the connecting sleeve is provided with a slurry blocking ring.
One end of the connecting sleeve connected with the front rod body can be communicated or not communicated with the grout outlet.
Preferably, the front rod body and the rear rod body are provided with external threads; or, the external thread is only arranged on the rear rod body.
The front rod body can also have another structure form, and a flat spiral structure (a twist structure) can be adopted.
The front rod body and the rear rod body can be in threaded connection with the connecting sleeve; alternatively, the front rod body and the connecting sleeve can be connected in a non-detachable mode.
The supporting base plate is a butterfly-shaped base plate, the gasket is a hemispherical gasket, and the contact surface of the supporting base plate and the gasket is a matched spherical surface.
Optionally, the support backing plate is provided with a hole, and a grouting exhaust pipe penetrates through the hole of the support backing plate.
1. The utility model discloses a with the anterior body of rod and the rear portion body of rod all design for the cavity body of rod, the external diameter of the anterior body of rod is greater than the external diameter of the rear portion body of rod for the anterior body of rod realizes quick anchor power with the anchor body jointly in the drilling, can practice thrift the steel material of the anterior body of rod simultaneously, saves the cost.
2. The utility model discloses, regard as the anchor section with the front portion body of rod, the rear portion body of rod is as the free segment, through backing plate, nut and packing ring locking part, can realize prestressing force, realizes the quick support power.
3. The utility model discloses a back slip casting can be realized to the play thick liquid hole of hollow rear portion body of rod and adapter sleeve, makes the slip casting body plump even.
Drawings
Fig. 1 is a schematic structural view of a bonded prestressed hollow anchor rod of the present invention;
fig. 2 is a schematic structural view of a bonded prestressed hollow anchor rod according to embodiment 2 of the present invention.
In the figure: 1-a front rod body; 2-rear rod body; 3-connecting sleeves; 4-slurry blocking ring; 5-slurry outlet; 6-supporting the backing plate; 7-a nut; 8-gasket, 9-cavity, 10-bearing surface, 11-grouting exhaust pipe.
Detailed Description
The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.
As shown in fig. 1, a bonding type prestressed hollow anchor rod comprises a front rod body 1 and a rear rod body 2, wherein the front rod body 1 and the rear rod body 2 are connected through a connecting sleeve 3, the connecting sleeve 3 is provided with a slurry blocking ring 4, and a slurry outlet 5 is arranged at the connecting part of an inner hole of the connecting sleeve 3 and a cavity of the rear rod body 2; the rear end of the rear rod 2 is fitted with a bolster 6, a nut 7 and a washer 8.
The front rod body 1 and the rear rod body 2 are both hollow rod bodies made of steel materials, and the outer diameter of the front rod body 1 is larger than that of the rear rod body 2.
Specifically, in the present embodiment, the outer diameter of the front rod body 1 is 25mm, the outer diameter of the rear rod body 2 is 34mm, the wall thickness of the front rod body 1 is 5mm, and the wall thickness of the rear rod body (2) is 5mm
The front rod body 1 and the rear rod body 2 are both provided with external threads, and the external threads of the front rod body 1 and the rear rod body 2 are opposite in direction. In order to avoid stirring the explosive cartridge, the connection between the front rod body 1 and the connecting sleeve 3 is loosened, the front rod body 1 and the connecting sleeve 3 are fixedly connected in a non-detachable mode, and the rear rod body 2 and the connecting sleeve 3 are in detachable threaded connection.
In this embodiment, the supporting pad 6 is a butterfly pad, the gasket 8 is a hemispherical gasket, and the contact surface between the supporting pad 6 and the gasket 8 is a spherical surface matched with each other.
The method for supporting comprises the following steps:
a drill is used to drill a hole in the formation and clean the hole. And assembling the front rod body 1, the rear rod body 2, the connecting sleeve 3 and the grout blocking ring 4 on site to form the anchor rod body. And filling early strength anchoring agent in the deep part of the drilled hole. The loading is based on the actual anchoring space volume after insertion of the front rod 1, the drilling volume between the front rod 1 and the grout ring 4.
The assembled anchor body is arranged in place by means of a drilling machine such as rotary impact, the early strength anchoring agent is fully stirred and extruded by the front rod body 1, and the drilled hole is densely filled with the early strength anchoring agent, so that the early strength anchoring body is formed. After the early strength anchor solid is solidified to reach the required strength, a supporting base plate 6, a washer 8 and a nut 7 are arranged on the supporting surface, so that the supporting base plate 6 is tightly attached to the supporting surface 10.
When the anchor rod needs to be prestressed, a hydraulic hollow plunger jack can be used for tensioning the prestress of the rear rod body 2, and a nut 7 is used for locking the prestress load; or the nut 7 can be directly tightened by a torque wrench to achieve the prestressing. When the anchor rod is used as a prestressed anchor rod, the length from the rear rod body 2 to the grout outlet 5 of the connecting sleeve 3 is a free section, and the length from the front rod body 1 to the grout blocking ring 4 is an anchoring section.
And after the steps are completed, grouting is performed on the 2 sections of the rear rod body. The hollow space 9 of the hollow rear rod body 2 serves as a grouting channel, and the gap between the support mat 6 and the support surface 10 serves as an air vent. Grouting from the cavity end part of the rear rod body 2, enabling grout to flow out of the grout outlet 5 through the hollow rear rod body 2 to enter the drilled hole and gradually filling the drilled hole to form grout, stopping grouting when the grout flows out of a gap between the bearing backing plate 6 and the bearing surface, and completing anchor rod installation.
Example 2
As an explanation of embodiment 2 of the present invention, only differences from embodiment 1 will be explained below.
As shown in fig. 2, in the present embodiment, the backup plate 6 is provided with a hole, and a grouting exhaust pipe 11 is inserted through the hole of the backup plate 6.
After the grouting exhaust pipe 11 is arranged, when grouting is performed, the cavity of the hollow rear rod body 2 serves as a grouting channel 9, and the grouting exhaust pipe 11 serves as an exhaust passage. And grouting is carried out from the end part of the cavity of the rear rod body 2, grout flows out from the grout outlet hole 5 through the grouting channel 9 to enter the drilled hole and is gradually filled in the drilled hole to form grouting body, and when the grout flows out from the grouting exhaust pipe 11, grouting is stopped, and anchor rod installation is completed.
Alternatively, when the anchor is installed upwards, the grouting exhaust pipe 11 can also be used as a grouting channel, and the cavity 9 of the rear rod body 2 can be used as an exhaust channel. During grouting, the grout is gradually filled to form grouting body, and the grouting body enters the cavity 9 of the rear rod body 2 from the grout outlet 5. When grout flows out from the end part of the rear rod body 2, grouting is stopped, and anchor rod installation is completed.
The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A bonding type prestress hollow anchor rod comprises a front rod body (1) and a rear rod body (2), wherein the front rod body (1) and the rear rod body (2) are connected through a connecting sleeve (3), and the bonding type prestress hollow anchor rod is characterized in that the front rod body (1) and the rear rod body (2) are both hollow rod bodies, and the outer diameter of the front rod body (1) is larger than that of the rear rod body (2);
a slurry outlet (5) is arranged at the connection part of the inner hole of the connecting sleeve (3) and the cavity of the rear rod body (2); the rear end part of the rear rod body (2) is matched with the supporting base plate (6), the nut (7) and the gasket (8).
2. The bonded prestressed hollow anchor rod according to claim 1, wherein the outer diameter of the front rod body (1) is 5 to 12mm smaller than the borehole diameter.
3. The hollow anchor rod of claim 1, characterized in that the connecting sleeve (3) is provided with a grout ring (4).
4. The hollow anchor of claim 1, wherein the front rod (1) and the rear rod (2) are provided with external threads; or, the external thread is only arranged on the rear rod body (2).
5. The bonded prestressed hollow rock bolt of claim 1, characterized in that said front shank (1) is of flat helical configuration.
6. The hollow anchor rod of claim 1, characterized in that the front rod (1) and the rear rod (2) are connected with the connecting sleeve (3) by screw thread.
7. The hollow anchor rod of claim 1, wherein the bearing plate (6) is a butterfly plate, the washer (8) is a hemispherical washer, and the contact surfaces of the bearing plate (6) and the washer (8) are matched spherical surfaces.
8. The hollow anchor rod of claim 1, wherein the support plate (6) is provided with a hole, and a grouting exhaust pipe (11) is inserted into the hole of the support plate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120144241.9U CN214530644U (en) | 2021-01-19 | 2021-01-19 | Bonding type prestress hollow anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120144241.9U CN214530644U (en) | 2021-01-19 | 2021-01-19 | Bonding type prestress hollow anchor rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214530644U true CN214530644U (en) | 2021-10-29 |
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ID=78345882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120144241.9U Active CN214530644U (en) | 2021-01-19 | 2021-01-19 | Bonding type prestress hollow anchor rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214530644U (en) |
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2021
- 2021-01-19 CN CN202120144241.9U patent/CN214530644U/en active Active
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