CN112160778A - Tunnel side wall anchor rod hole grouting exhaust and pressure stabilizing device and construction method - Google Patents
Tunnel side wall anchor rod hole grouting exhaust and pressure stabilizing device and construction method Download PDFInfo
- Publication number
- CN112160778A CN112160778A CN202011009445.8A CN202011009445A CN112160778A CN 112160778 A CN112160778 A CN 112160778A CN 202011009445 A CN202011009445 A CN 202011009445A CN 112160778 A CN112160778 A CN 112160778A
- Authority
- CN
- China
- Prior art keywords
- grouting
- anchor rod
- rod hole
- pressure
- exhaust pipe
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
Abstract
The invention belongs to the technical field of tunnel engineering, and particularly relates to a grouting exhaust and pressure stabilizing device for an anchor rod hole of a tunnel side wall, which comprises an exhaust pipe, wherein an end part cut-off cone section is arranged at the air outlet end of the exhaust pipe; the end cutting cone section consists of a plurality of cone sheets which can be opened to form a hollow structure; the surface of the end cutting cone section is sleeved with an elastic rubber ring; a sand bag is arranged in the exhaust pipe; the construction method comprises the following steps: mounting the grouting exhaust and pressure stabilizing device of the anchor rod hole of the tunnel side wall on a grouting anchor rod; grouting from the grout inlet end of the hollow anchor rod body, and discharging air in the anchor rod hole from the exhaust pipe along with the increase of grouting amount; along with the further increase of the grouting amount, the whole anchor rod hole is filled with the grout, the sand bag moves towards the end cutting cone section under the action of the grouting pressure, and the sand bag is limited by the contraction force of the externally-wrapped elastic rubber ring to form pressure stabilization. The invention can ensure the pressure stabilization in the grouting process, effectively improve the grouting compactness of the anchor rod hole and improve the anchoring quality of the anchor rod.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering, and particularly relates to a grouting exhaust and pressure stabilization device for a tunnel side wall anchor rod hole and a construction method.
Background
The anchor bolt support is widely applied to underground caverns such as traffic tunnels, hydraulic caverns and the like, and is one of main support measures of tunnels designed according to the 'new Austrian' principle. A commonly used grouting anchor in China generally comprises an anchoring head 100 (anchored by using an expanding shell type metal anchor or resin), a hollow rod body 200, a grout stop plug 300, a backing plate 400, a nut 500 and an exhaust (grouting) pipe 600, as shown in fig. 1. When the anchor rod is used for supporting the arch part of the tunnel, the anchor rod is inclined upwards, so that the grouting of the anchor rod hole is carried out by adopting a mode of feeding the grouting through the exhaust (grouting) pipe and exhausting the grouting through the hollow rod body; when the stock is used for tunnel side wall to strut, the stock down slope this moment, consequently adopt the cavity body of rod to advance thick liquid, exhaust (slip casting) pipe exhaust (thick liquid) mode carries out the anchor rod hole slip casting.
And when the stock was used for tunnel side wall to strut, because blast pipe, cavity body of rod do not have and only starch the stopper, the unable steady voltage of slip casting in-process, the unable infiltration of thick liquid is the country rock, has reduced the anchor effect. Therefore, there is a need for a grouting, air-exhausting and pressure-stabilizing device for a bolt hole of a tunnel sidewall and a construction method thereof, so as to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a grouting air exhausting and pressure stabilizing device for an anchor rod hole of a tunnel side wall and a construction method, which can ensure the pressure stabilization in the grouting process and improve the anchoring quality of an anchor rod.
In order to achieve the purpose, the technical scheme of the invention is that the grouting air exhausting and pressure stabilizing device for the anchor rod hole of the side wall of the tunnel comprises an exhaust pipe, wherein the exhaust pipe is provided with an air inlet end and an air outlet end, and the air outlet end of the exhaust pipe is provided with an end part cut-off cone section; the end-cut cone section is composed of a plurality of cone sheets which can be closed to form a cone structure and opened to form a hollow structure; the surface of the end cutting cone section is sleeved with an elastic rubber ring; and a sand bag is arranged in the exhaust pipe.
Further, the end-cut cone segment has a connecting end and a tip end, and the size of the cone segments decreases sequentially from the connecting end to the tip end.
Furthermore, the elastic rubber ring is sleeved on the connecting end of the end cutting cone section.
Further, the plurality of vertebral segments are the same size.
Further, the sand bag is made of coarse sand wrapped by geotextile.
Further, the sand pack is disposed within the exhaust pipe proximate to the end-cut cone segments.
The invention also provides a construction method for grouting, exhausting and stabilizing the pressure by adopting the tunnel side wall anchor rod hole, which comprises the following steps:
s1, mounting the grouting exhaust and pressure stabilizing device on the grouting anchor rod of the anchor rod hole of the tunnel side wall;
s2, constructing anchor rod drilling holes, then inserting grouting anchor rods, and realizing end head anchoring;
s3, grouting from the grout inlet end of the hollow anchor rod body, wherein grout flows out from the grout outlet end of the hollow anchor rod body and enters the anchor rod hole along with the increase of pressure;
s4, along with the increase of grouting amount, grout flows from the bottom to the top along the anchor rod hole, air in the anchor rod hole enters from the air inlet end of the exhaust pipe and enters the end cut-off cone section through the sand bag, under the action of air pressure, a plurality of cone pieces of the end cut-off cone section are opened to form a hollow structure, and the air is exhausted through the hollow structure;
s5, with the further increase of the grouting amount, the grout fills the whole anchor rod hole and flows from the air inlet end of the exhaust pipe to the sand bag in the exhaust pipe;
s6, the sand bag moves to the end cut cone section under the action of grouting pressure, when the sand bag moves to the position of the elastic rubber ring, the sand bag stops moving under the restriction of the contraction force of the elastic rubber ring coated outside, and pressure stabilization is formed;
and S7, stopping grouting after the grouting pressure stabilization reaches the design specified time.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the hollow anchor rod body is grouted, air in the anchor rod hole is discharged from the air exhaust and pressure stabilizing device, after the whole anchor rod hole is filled with slurry, the sand bag arranged in the air exhaust and pressure stabilizing device moves towards the end part cut-off cone section under the action of grouting pressure, but is limited by the contraction force of the elastic rubber ring externally coated, so that pressure stabilization is formed, the pressure stabilization in the grouting process is ensured, the grouting compactness of the anchor rod hole is effectively improved, and the anchoring quality of the anchor rod is improved;
(2) the invention replaces the original exhaust pipe with the grouting exhaust and pressure stabilizing device for the anchor rod hole of the tunnel side wall on the basis of the existing anchor rod assembly, not only is the reconstruction of the existing anchor rod assembly less and the reconstruction cost low, but also the original construction process of the anchor rod is not changed after the reconstruction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an overall view of a prior art grouting bolt provided in the background art;
FIG. 2 is a schematic structural diagram of a grouting, air-exhausting and pressure-stabilizing device for a bolt hole of a tunnel sidewall provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a grouting anchor rod provided by an embodiment of the invention;
in the figure: 1. the device comprises an exhaust and pressure stabilizing device, 11, an exhaust pipe, 12, a sand bag, 13, an end cut-off cone section, 14, an elastic rubber ring, 2, a hollow anchor rod body, 3, a grout stop plug, 4, a backing plate, 5, a nut, 6 and an expansion shell type anchoring part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 2, the present embodiment provides a grouting, air-discharging and pressure-stabilizing device 1 for a bolt hole of a tunnel sidewall, comprising an air-discharging pipe 11, wherein the air-discharging pipe 11 has an air-inlet end and an air-outlet end, and the air-outlet end of the air-discharging pipe 11 is provided with an end-cut taper section 13; the end-cut cone segment 13 is composed of a plurality of cone pieces that can be closed to form a cone structure and opened to form a hollow structure; the surface of the end cutting cone section 13 is sleeved with an elastic rubber ring 14; a sand bag 12 is arranged in the exhaust pipe 11. This embodiment prevents the thick liquid outflow through set up sand package 12 in blast pipe 11, sets up the tip at the end of giving vent to anger of blast pipe 11 simultaneously and opens cone section 13 to open cone section 13 surface cover at the tip and establish elasticity rubber circle 14, prevent that sand package 12 from removing outside blast pipe 11 at the effect of slip casting pressure, thereby form the steady voltage at the slip casting in-process, improve the anchor effect.
In this embodiment, the exhaust pipe 11 is a plastic exhaust pipe.
Further, the end-cut cone segments 13 have a connecting end and a tip end, and the size of the cone segments decreases sequentially from the connecting end to the tip end.
Furthermore, the elastic rubber ring 14 is sleeved on the connecting end of the end cutting cone section 13, so that the sand pack 12 can be limited from moving to the tip under the action of the contraction force of the elastic rubber ring 14. In this embodiment, the elasticity of the elastic rubber ring 14 sleeved on the end-cut cone section 13 should be calculated and determined and selected according to the grouting pressure, the elastic restoring force of the plastic pipe end-cut cone section 13, and other factors, so as to ensure that the pressing force of the elastic rubber ring 14 can meet the requirement of the grouting pressure.
Further, the size of the vertebral segments may be the same, different or not identical.
Further, the sand pack 12 is made of geotextile wrapped coarse sand. The sand pack 12 of this embodiment is made by wrapping a certain amount of coarse sand with geotextile, and it is air permeable but not leaking slurry, wherein the length of the sand pack 12, permeability coefficient of geotextile, particle size of coarse sand, etc. should be determined according to air permeability and permeability of grouting slurry.
Further, the sand pack 12 is disposed within the exhaust pipe 11 at a position close to the end-cut cone section 13. When the anchor rod hole is filled with grout, the sand bag moves towards the end cutting cone section 13 under the action of grouting pressure, but is limited by the contraction force of the elastic rubber ring outside the sand bag, and the sand bag stops moving, so that the exhaust function and the pressure stabilizing function are realized.
As shown in fig. 2-3, the present embodiment further provides a construction method using the grouting air-exhausting and pressure-stabilizing device 1 for the bolt hole of the tunnel side wall, which includes the following steps:
s1, mounting the grouting exhaust and pressure stabilizing device 1 for the anchor rod hole of the tunnel side wall on a grouting anchor rod; as shown in fig. 3, a slurry outlet end of a hollow anchor rod body 2 is provided with a shell expansion type anchoring member 6, a slurry inlet end of the hollow anchor rod body 2 is sequentially provided with a nut 5, a backing plate 4 and a slurry stop plug 3, an air inlet end of an exhaust pipe 11 sequentially penetrates through the backing plate 4 and the slurry stop plug 3, and an air outlet end of the exhaust pipe 11 is positioned on one side of the backing plate 4 away from the slurry stop plug 3;
s2, constructing anchor rod drilling holes, then inserting grouting anchor rods, and realizing end head anchoring;
s3, grouting from the grout inlet end of the hollow anchor rod body 2, wherein as the pressure rises, grout flows out from the grout outlet end of the hollow anchor rod body 2 and enters the anchor rod hole;
s4, along with the increase of grouting amount, grout flows from the bottom to the top along the anchor rod hole, air in the anchor rod hole enters from the air inlet end of the exhaust pipe 11 and enters the end cut-off cone section 13 through the sand bag 12, under the action of air pressure, a plurality of cone pieces of the end cut-off cone section 13 are opened to form a hollow structure, and the air is exhausted through the hollow structure;
s5, with the further increase of the grouting amount, the grout fills the whole anchor rod hole and flows from the air inlet end of the exhaust pipe 11 to the sand bag 12 in the exhaust pipe 11;
s6, the sand bag 12 moves towards the end cut-off cone section 13 under the action of grouting pressure, and when the sand bag moves to the position of the elastic rubber ring 14, the sand bag 12 stops moving under the limitation of the contraction force of the elastic rubber ring 14 coated outside, so that pressure stabilization is formed;
and S7, stopping grouting after the grouting pressure stabilization reaches the design specified time, and removing the grouting pipe.
The embodiment replaces original blast pipe for the tunnel side wall anchor rod hole slip casting exhaust and the pressure stabilizer that the embodiment provided on the basis of existing stock assembly, not only to the transformation of existing stock assembly few, the transformation expense is low, and does not change the original construction process of stock after transforming, can also guarantee slip casting in-process steady voltage, improves the closely knit and stock anchor quality of stock hole slip casting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a tunnel side wall anchor rod hole slip casting exhaust and pressure stabilizer which characterized in that: the exhaust pipe is provided with an air inlet end and an air outlet end, and the air outlet end of the exhaust pipe is provided with an end part cut-open cone section; the end-cut cone section is composed of a plurality of cone sheets which can be opened to form a hollow structure; the surface of the end cutting cone section is sleeved with an elastic rubber ring; and a sand bag is arranged in the exhaust pipe.
2. The grouting air exhausting and pressure stabilizing device for the anchor rod hole of the tunnel sidewall as claimed in claim 1, wherein: the end-cut cone segment has a connecting end and a tip end, and the size of the cone segments decreases sequentially from the connecting end to the tip end.
3. The grouting air exhausting and pressure stabilizing device for the anchor rod hole of the tunnel sidewall as claimed in claim 2, wherein: the elastic rubber ring is sleeved on the connecting end of the end cutting cone section.
4. The grouting air exhausting and pressure stabilizing device for the anchor rod hole of the tunnel sidewall as claimed in claim 1, wherein: the plurality of vertebral segments are the same size.
5. The grouting air exhausting and pressure stabilizing device for the anchor rod hole of the tunnel sidewall as claimed in claim 1, wherein: the sand bag is made by wrapping coarse sand with geotextile.
6. The grouting air exhausting and pressure stabilizing device for the anchor rod hole of the tunnel sidewall as claimed in claim 1, wherein: the sand pack is disposed within the exhaust pipe proximate to the end-cut cone section.
7. A construction method using the grouting exhaust and pressure stabilizing device for the anchor bolt hole of the tunnel side wall according to any one of claims 1 to 6, which is characterized by comprising the following steps:
s1, mounting the grouting exhaust and pressure stabilizing device on the grouting anchor rod of the anchor rod hole of the tunnel side wall;
s2, constructing anchor rod drilling holes, then inserting grouting anchor rods, and realizing end head anchoring;
s3, grouting from the grout inlet end of the hollow anchor rod body, wherein grout flows out from the grout outlet end of the hollow anchor rod body and enters the anchor rod hole along with the increase of pressure;
s4, along with the increase of grouting amount, grout flows from the bottom to the top along the anchor rod hole, air in the anchor rod hole enters from the air inlet end of the exhaust pipe and enters the end cut-off cone section through the sand bag, under the action of air pressure, a plurality of cone pieces of the end cut-off cone section are opened to form a hollow structure, and the air is exhausted through the hollow structure;
s5, with the further increase of the grouting amount, the grout fills the whole anchor rod hole and flows from the air inlet end of the exhaust pipe to the sand bag in the exhaust pipe;
s6, the sand bag moves to the end cut cone section under the action of grouting pressure, when the sand bag moves to the position of the elastic rubber ring, the sand bag stops moving under the restriction of the contraction force of the elastic rubber ring coated outside, and pressure stabilization is formed;
and S7, stopping grouting after the grouting pressure stabilization reaches the design specified time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009445.8A CN112160778A (en) | 2020-09-23 | 2020-09-23 | Tunnel side wall anchor rod hole grouting exhaust and pressure stabilizing device and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009445.8A CN112160778A (en) | 2020-09-23 | 2020-09-23 | Tunnel side wall anchor rod hole grouting exhaust and pressure stabilizing device and construction method |
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| Publication Number | Publication Date |
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| CN112160778A true CN112160778A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011009445.8A Pending CN112160778A (en) | 2020-09-23 | 2020-09-23 | Tunnel side wall anchor rod hole grouting exhaust and pressure stabilizing device and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114382078A (en) * | 2022-01-24 | 2022-04-22 | 福州大学 | Anchor cable bundle steel strand stress and deformation coordination member and use method thereof |
-
2020
- 2020-09-23 CN CN202011009445.8A patent/CN112160778A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114382078A (en) * | 2022-01-24 | 2022-04-22 | 福州大学 | Anchor cable bundle steel strand stress and deformation coordination member and use method thereof |
| CN114382078B (en) * | 2022-01-24 | 2024-01-30 | 福州大学 | Stress and deformation coordination component among anchor cable bundle steel strands and use method |
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