CN112796764A - Peripheral hole arc drilling construction method for controlling tunnel overexcavation - Google Patents
Peripheral hole arc drilling construction method for controlling tunnel overexcavation Download PDFInfo
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- CN112796764A CN112796764A CN202011644303.9A CN202011644303A CN112796764A CN 112796764 A CN112796764 A CN 112796764A CN 202011644303 A CN202011644303 A CN 202011644303A CN 112796764 A CN112796764 A CN 112796764A
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- tunnel
- drilling
- drill rod
- drill
- hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
Abstract
The invention discloses a peripheral hole arc drilling construction method for controlling tunnel overexcavation, which relates to the technical field of tunnel construction and comprises the following steps: s1, drilling holes in the front direction of the tunnel at the position close to the excavation contour line of the tunnel face by using a drill rod in the direction of an external insertion angle theta with the axis of the tunnel and with the drilling length L0(ii) a S2, continuously applying external force F towards the inner side of the tunnel at the tail end of the drill rod and the position close to the hole1And an external force F toward the outside of the tunnel2The drill rod is enabled to generate the deformation protruding towards the inner wall direction of the tunnel and continuously drill, and the straight hole can be changed into the arc hole by drilling in the state; the construction method can drill the arc-shaped tunnel drilling explosion peripheral holes, and compared with the linear peripheral holes with the same footage length, the construction method can effectively reduce the excessive excavation amount of the tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to an arc-shaped drilling method for peripheral holes for controlling over excavation of a tunnel.
Background
As an indispensable main tunnel rock breaking method, the drilling and blasting method is a method of excavating rock by drilling, charging, and blasting. In the drilling and blasting method construction, the air drill is manually held or engineering machinery such as a drill jumbo is used for drilling holes in rocks and then explosive is filled, when holes around a tunnel are drilled, due to the limitation of the structure of a drilling machine, the drilled holes are necessarily provided with external insertion angles, a certain amount of overexcavation phenomena can occur, particularly, the overexcavation phenomena of mechanical drilling are serious, the overexcavation part needs to be backfilled with concrete to control the size of the tunnel, the concrete backfilling caused by the overexcavation not only can increase the engineering cost, but also can influence the safety and quality of tunnel construction and delay the construction period in certain weak broken surrounding rocks, and therefore, how to effectively control the overexcavation is an important problem to be solved urgently in the tunnel drilling and blasting method construction.
Disclosure of Invention
The invention aims to provide an arc-shaped drilling method for peripheral holes for controlling the over-excavation of a tunnel, which can drill arc-shaped peripheral holes and can effectively reduce the over-excavation amount of the tunnel compared with linear peripheral holes with the same footage length.
The technical scheme for solving the technical problems is as follows:
a peripheral hole arc drilling construction method for controlling tunnel overexcavation is characterized by comprising the following steps:
s1, drilling holes in the front direction of the tunnel at the position close to the excavation contour line of the tunnel face by using a drill rod in the direction forming an external insertion angle theta with the axis of the tunnel, wherein the drilling length L is the drilling length0；
S2, continuously applying external force F towards the inner side of the tunnel at the tail end of the drill rod and the position close to the hole1And an external force F towards the outside of the tunnel2So that the drill rod generates the deformation protruding towards the inner wall direction of the tunnel and generates an external force F1And an external force F2The hole is continuously drilled.
This scheme provides a tunnelA method for drilling holes around a tunnel includes drilling a drill rod from the excavation contour line of the periphery of a tunnel face to the inner inclination angle theta of a tunnel by a distance L0When drilling is continued, external force F towards the inner side of the tunnel is continuously applied to the tail of the drill rod1Applying external force F towards the outer side of the tunnel at the position of the drill rod close to the hole opening2Since the drill rod has high strength and toughness and the front end of the drill rod is restrained in the drill hole, the drill rod outside the drill hole is under an external force F1、F2Produce the convex deformation to tunnel inner wall direction under the combined action, along with the drilling rod continues to drill forward, the drilling rod constantly gos deep into and drills, the drill bit deflects to the tunnel direction gradually when moving along the footage direction under the drive of crooked drilling rod, thereby become the arc drilling that is close to excavation contour line direction gradually with former straight line drilling, because for the part of overexciting between drilling and the excavation contour line, then when drilling is close to the excavation contour line gradually, can reduce the area between drilling and the excavation contour line, thereby reduce the volume of overexciting. Combined external force F1、F2The size of (D) can be selected according to actual construction, but the external force F is ensured to be applied1、F2The drill rod generates the deformation protruding towards the inner wall direction of the tunnel.
Further, in the preferred embodiment of the invention, the drill rod is arranged on the pneumatic drill, and the external insertion angle theta is 1.5-3.0 degrees.
Further in a preferred embodiment of the invention the drill rod is arranged on the drill jumbo with an angle of attack of 2.5-5.0 °.
When the external insertion angle is within the range, when the drill rod drills into the rock in the tunnel, the drill rod can be ensured to be convenient to operate, and the smaller over-excavation amount is ensured.
Further, in the preferred embodiment of the present invention, the penetration length L0Is 30cm to 60 cm.
The drill rod firstly drills into the rock along a straight line by a length L0To fix the drill rod head and facilitate the external force F for the drill rod combination1、F2When the drill rod is drilled, the head of the drill rod is restrained by the drill hole, so that the drill rod is bent and deformed, and meanwhile, the drilling length L of the drill rod is increased0Also affects the distance between the final drilled hole and the overetch lineThereby affecting the amount of overbreak when the drill pipe is drilled to length L0When the volume of the drill rod head is 30cm to 60cm, the drill rod head can be reliably fixed in the drilled hole, and the smaller volume of the drill rod head is guaranteed to be overstocked.
Further, in the preferred embodiment of the present invention, the external force F1Is directed to the inner side of the tunnel and is vertical to the axis of the drill rod, and an external force F2Directed towards the outside of the tunnel and perpendicular to the axis of the drill rod.
When an external force F is applied1And an external force F2When all the drill rods are perpendicular to each other, an external force F1And F2Without component force in the axial direction of the drill rod, the external force F1And F2Is completely used for the deformation of the drill rod, and compared with the external force in other directions, the external force F1And F2When the drill rod is vertical to the drill rod, the drill rod generates the same deformation required external force F1And F2Is the minimum value.
Further, in the preferred embodiment of the present invention, the external force F1And an external force F2Manual and/or mechanical application is employed.
External force F1And an external force F2The method is applicable to different construction modes by adopting manual and/or mechanical application, such as a mechanical drill arm attached to equipment such as a pneumatic drill or a drill jumbo.
The invention has the following beneficial effects:
the invention provides a drilling construction method of peripheral holes of a tunnel, which can drill arc peripheral holes, and compared with linear peripheral holes, the arc peripheral holes are continuously close to an excavation contour line in the footage direction, so that the overexcavation area between the drilling holes and the excavation contour line is reduced, the concrete backfill amount is reduced, the construction cost is reduced, the construction period is shortened, and the tunnel stability is enhanced.
Drawings
FIG. 1 is a schematic view of the relationship between the angle of a drill rod and the position of a drilled hole during the drilling of a peripheral hole;
FIG. 2 is a schematic structural view of a peripheral hole arc drilling method for controlling over-excavation of a tunnel;
fig. 3 is a partial enlarged view of fig. 2 at a.
Wherein: 1-a drill rod; 11-a drill rod holder; 12-contour line after deformation of drill rod; 2-palm surface; 21-excavating contour lines; 3, arc drilling; 4-straight line drilling; i, the corresponding overbreak area of the arc-shaped drilling hole is obtained; II-reduced overbreak area for curved bore holes compared to straight bore holes.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
Fig. 1 and 2 are schematic diagrams of the cross-sectional direction of the tunnel, the rocks within the excavation contour line 21 of the periphery of the tunnel face 2 need to be removed, refer to the drilling device a in fig. 1, the outer diameter of the drill rod 1 is far smaller than the outer diameter of the drill rod base 11 at the rear end of the drill rod, then because the inner wall of the tunnel blocks the drill rod base 11, when the holes around are drilled, if the drill rod 1 is drilled in parallel with the excavation contour line 21 of the tunnel, a part of the rocks cannot be removed if the drill rod 1 is left between the drill rod 1 and the excavation contour line 21, that is, the dotted line L1The part between the excavation contour line 21 and the drill rod 1 is arranged according to the drilling device B in the figure 1 when the peripheral holes are drilled, namely, the drill rod 1 drills holes from the excavation contour line 21 into the rock at a certain external insertion angle, and the dotted line L2After the inner rock is removed, the dotted line L2And an overexcavation part is arranged between the excavation contour line 21, and the tunnel size needs to be ensured by backfilling concrete.
Referring to fig. 2 and 3, a peripheral hole arc drilling method for controlling tunnel overexcitation, in the embodiment, a drill jumbo is adopted, the concrete models of the drill jumbo are atlas XL3D and Boomer2238 type three-arm full-hydraulic rock drills for drilling, and the construction method comprises the following steps:
s1, drilling a length L in the tunnel from the excavation contour line 21 on the periphery of the tunnel face 2 to the direction of an external insertion angle theta between the outer edge of the tunnel and the inner wall of the tunnel by using the drill rod 10In the present embodiment, the external cutting angle θ is 3 °, and the penetration length L is set to be long0In other embodiments of the present invention, the extrapolation angle θ may also be any value between 2.5 ° and 5.0 °, and in other embodiments of the present invention, the drill is rotatedThe rod 1 can also be arranged on an air drill, when the drill rod 1 is arranged on the air drill, the external insertion angle is any value between 1.5 degrees and 3.0 degrees, and the drilling length L0Can also be any value between 30cm and 60 cm;
s2, continuously applying external force F to the tail part of the drill rod 1 far away from the drill hole1Continuously applying an external force F to the drill rod 1 at a position close to the drill hole2External force F1Towards the inside of the tunnel and perpendicular to the axis of the drill rod 1, external force F2Towards the outside of the tunnel and perpendicular to the axis of the drill rod 1, external force F1And an external force F2So that the drill rod 1 generates the deformation protruding towards the inner wall direction of the tunnel and continuously drills, the contour line 12 of the deformed drill rod is as shown in figure 2, and an external force F is applied in the drilling process1And F2Is constant and has a constant angle with the drill rod 1.
If no external force F is applied, the drill rod 1 enters the rock in a straight line, the drill hole is a straight line gradually far away from the excavation contour line 21, namely a straight line drill hole 4 in the figure 2, and when the external force F is applied1And F2After, the drilling is for being close to the arc drilling 3 of excavation outline line 21 gradually, as shown in fig. 2, area I is the overexcavation area that 3 corresponds of arc drilling, area I + II is the overexcavation area that 4 correspond of former straight line drilling, area II is the overexcavation area that 3 than 4 reductions of straight line drilling of arc drilling, can know from this, 3 significantly reduced overexcavation areas of arc drilling, thereby be favorable to strengthening tunnel stability, reduce the concrete backfill volume, reduce construction cost, shorten construction cycle.
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 (6)
1. A peripheral hole arc drilling construction method for controlling tunnel overexcavation is characterized by comprising the following steps:
s1, drilling holes in the front of the tunnel at the position of an excavation contour line (21) close to the tunnel face (2) by a drill rod (1) in the direction of an external inserting angle theta with the axis of the tunnel, and drilling the holes with the length L0；
S2, continuously applying external force F towards the inner side of the tunnel at the tail end of the drill rod (1) and the position close to the hole1And an external force F toward the outside of the tunnel2So that the whole drill rod (1) generates the deformation protruding towards the inner wall direction of the tunnel and generates the external force F1And F2The hole is continuously drilled.
2. The arc-shaped drilling method for the peripheral holes for controlling the overexcavation of the tunnel according to claim 1, wherein the drill rod (1) is arranged on a pneumatic drill, and the external insertion angle theta is 1.5-3.0 degrees.
3. The arc-shaped drilling method for the peripheral holes for controlling the overexcitation of the tunnel according to claim 1, wherein the drill rods (1) are provided on a drill jumbo, and the angle of the external insertion θ is 2.5 ° to 5.0 °.
4. The method of claim 1 to 3, wherein the drilling length L is a length of a hole to be drilled0Is 30cm to 60 cm.
5. The method of claim 4, wherein the external force F is applied to the arc-shaped hole of the peripheral hole for controlling the overexcavation of the tunnel1Directed towards the inside of the tunnel and perpendicular to the axis of the drill rod (1), said external force F2Is directed towards the outside of the tunnel and perpendicular to the axis of the drill rod (1).
6. The method of claim 5, wherein the external force F is applied to the arc-shaped hole of the peripheral hole for controlling the overexcavation of the tunnel1And F2Manual and/or mechanical application, respectively, is employed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011644303.9A CN112796764A (en) | 2020-12-30 | 2020-12-30 | Peripheral hole arc drilling construction method for controlling tunnel overexcavation |
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| CN202011644303.9A CN112796764A (en) | 2020-12-30 | 2020-12-30 | Peripheral hole arc drilling construction method for controlling tunnel overexcavation |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2362630Y (en) * | 1999-01-13 | 2000-02-09 | 张力新 | Hand-holding type drilling tool for pressured pipe line |
| US20020185315A1 (en) * | 2001-06-11 | 2002-12-12 | Mcloughlin Stephen John | Wellbore directional steering tool |
| RU2306399C1 (en) * | 2006-02-26 | 2007-09-20 | Государственное образовательное учреждение высшего профессионального образования "Южно-Российский Государственный Технический Университет (Новочеркасский Политехнический Институт) | Directional well drilling method |
| CN105625943A (en) * | 2016-01-11 | 2016-06-01 | 德阳坚兵工程技术有限公司 | Method for accurately controlling overbreak and underbreak by adopting peripheral hole formation through fine-adjustment drill rod of rock drilling jumbo |
| CN106939768A (en) * | 2017-05-17 | 2017-07-11 | 中南大学 | A kind of hidden hole drilling orientation adjusting apparatus and its orientation method of adjustment |
| CN108825134A (en) * | 2018-07-27 | 2018-11-16 | 深圳市市政设计研究院有限公司 | A kind of drill bit guidance system and arc large scale piperoof construction method |
| CN109723444A (en) * | 2019-01-04 | 2019-05-07 | 中铁十一局集团第四工程有限公司 | A kind of Support System in Soft Rock Tunnels mechanization tunneling boring Rapid Excavation cyclization drill eye blasting construction |
| CN111828049A (en) * | 2020-07-28 | 2020-10-27 | 中建七局安装工程有限公司 | Shallow-buried underground excavation tunnel advanced small guide pipe construction method |
-
2020
- 2020-12-30 CN CN202011644303.9A patent/CN112796764A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2362630Y (en) * | 1999-01-13 | 2000-02-09 | 张力新 | Hand-holding type drilling tool for pressured pipe line |
| US20020185315A1 (en) * | 2001-06-11 | 2002-12-12 | Mcloughlin Stephen John | Wellbore directional steering tool |
| RU2306399C1 (en) * | 2006-02-26 | 2007-09-20 | Государственное образовательное учреждение высшего профессионального образования "Южно-Российский Государственный Технический Университет (Новочеркасский Политехнический Институт) | Directional well drilling method |
| CN105625943A (en) * | 2016-01-11 | 2016-06-01 | 德阳坚兵工程技术有限公司 | Method for accurately controlling overbreak and underbreak by adopting peripheral hole formation through fine-adjustment drill rod of rock drilling jumbo |
| CN106939768A (en) * | 2017-05-17 | 2017-07-11 | 中南大学 | A kind of hidden hole drilling orientation adjusting apparatus and its orientation method of adjustment |
| CN108825134A (en) * | 2018-07-27 | 2018-11-16 | 深圳市市政设计研究院有限公司 | A kind of drill bit guidance system and arc large scale piperoof construction method |
| CN109723444A (en) * | 2019-01-04 | 2019-05-07 | 中铁十一局集团第四工程有限公司 | A kind of Support System in Soft Rock Tunnels mechanization tunneling boring Rapid Excavation cyclization drill eye blasting construction |
| CN111828049A (en) * | 2020-07-28 | 2020-10-27 | 中建七局安装工程有限公司 | Shallow-buried underground excavation tunnel advanced small guide pipe construction method |
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