KR101674811B1 - An Reinforcement Method for Weak Area in Underground Space Excavation - Google Patents
An Reinforcement Method for Weak Area in Underground Space Excavation Download PDFInfo
- Publication number
- KR101674811B1 KR101674811B1 KR1020150088317A KR20150088317A KR101674811B1 KR 101674811 B1 KR101674811 B1 KR 101674811B1 KR 1020150088317 A KR1020150088317 A KR 1020150088317A KR 20150088317 A KR20150088317 A KR 20150088317A KR 101674811 B1 KR101674811 B1 KR 101674811B1
- Authority
- KR
- South Korea
- Prior art keywords
- tunnel
- steel wire
- ground reinforcement
- steel pipe
- excavation
- Prior art date
Links
- 230000002787 reinforcement Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009412 basement excavation Methods 0.000 title abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 239000011435 rock Substances 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 241000269793 Cryothenia peninsulae Species 0.000 claims abstract description 4
- 230000003313 weakening effect Effects 0.000 claims abstract description 4
- 239000011440 grout Substances 0.000 claims description 8
- 230000001012 protector Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract 1
- 238000003780 insertion Methods 0.000 description 15
- 230000037431 insertion Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 238000007789 sealing Methods 0.000 description 8
- 239000011378 shotcrete Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 206010016173 Fall Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- PQTCMBYFWMFIGM-UHFFFAOYSA-N gold silver Chemical compound [Ag].[Au] PQTCMBYFWMFIGM-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D13/00—Large underground chambers; Methods or apparatus for making them
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Soil Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to a ground reinforcement method for an underground space, and more particularly, to a ground reinforcement method for a subterranean excavation weakening portion in which reinforcement of a weakened portion is made in a three-dimensional cubic shape to secure stability of an underground space. The construction includes a main tunnel tunnel excavation step in which a pithead is installed at a site where a close-proximity tunnel is to be excavated and a main tunnel is excavated to a required depth, and a main tunnel tunnel excavation step in which a branch tunnel is excavated from a side excavation surface of the main- A step of drilling holes for inserting a plurality of ground reinforcement insert holes having a lower, left, and right spacing, a step of drilling the ground reinforcement insert holes, and a step of installing a steel pipe or a rock bolt through the perforated hole for inserting the ground reinforcement, And a grooved tunnel excavation step for excavating the branch tunnel to a depth corresponding to the main tunnel to one side of the main tunnel adjacent to the main tunnel, A method of reinforcing a weakened portion of a ground by passing a steel wire through the steel pipe, Or a steel wire having a ring formed on the rock bolt is provided and a steel wire protecting member is provided on one side of the steel wire and then the connecting part formed on the other end of the steel wire is fastened with a fastener to form a three- To form a cube-like shape; And a control unit.
Description
The present invention relates to a ground reinforcement method for an underground space, and more particularly, to a ground reinforcement method for a subterranean excavation weakening portion in which reinforcement of a weakened portion is made in a three-dimensional cubic shape to secure stability of an underground space.
In general, in order to prevent the ground or rock from loosening or collapsing by transferring the tensile force generated in the structure to the ground and rock, cable bolts or rock bolts (drilled into the rock during tunnel or rock cut, etc., A bolt used to prevent collapse of the surface rock as a nut tightening mechanism, etc.), shotcrete (grout for blowing cement, coarse aggregate and water into compressed air), H type And reinforced with ground reinforcements including girders and girders.
However, in the conventional method of reinforcing a weak ground for excavation, for example, not only the excavation weak portion of the outer tunnel but also the one-dimensional (one-dimension: one-dimensional Is geometrically straight or curved), it has a problem that the reinforcement area is very narrow because it is provided to reinforce the ground.
Also, since the reinforcing area is narrow, many stiffeners must be installed, which causes problems such as damage to the excavation weak part due to a large number of holes.
In the prior art, the reinforcing bars of the reinforcing bar type are connected and fastened to the walls of both tunnel excavation sections to secure the binding force of the pillars. However, since the binding force of the pillars in the direction of tunnel advance is weak, There is a problem of being exposed to the risk of falling down.
In addition, in a weak section where the ground condition is poor, not only the reinforcing efficiency is lowered but also it is difficult to reinforce the weak section at one time.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a three-dimensional The present invention provides a ground reinforcement method for a weak section of an underground space which is reinforced in a cube shape to improve the ground reinforcement efficiency and ensure stability.
According to another aspect of the present invention, there is provided a method of constructing a main tunnel, the method comprising: a main tunnel tunnel excavation step of installing a pithead at a site where a close-proximity tunnel is to be excavated and excavating a main tunnel to a required depth; A step of drilling a plurality of ground reinforcement material insertion holes each having an upper, lower, left, and right spacing in a direction in which the tunnel is to be excavated, a step of drilling the ground reinforcement material insertion hole, A step of grouting or installing a steel pipe or a rock bolt for grouting by grouting pressure grout between the wall surface of the reinforcing material insertion hole and the outer circumferential surface of the ground reinforcement and a step for grouting the branch tunnel to a depth corresponding to the main tunnel, Claims [1] A method of reinforcing an underground excavation weak ground comprising a tunnel excavation step, comprising the steps of: A horizontal line, a vertical plane and a diagonal plane are formed to form a three-dimensional cubic shape, or a steel wire having a loop formed in the rock bolt is provided and a steel wire protecting member is provided on one side of the steel wire, A step of installing a steel wire into a three-dimensional cubic shape by fastening the part with a fastener; And a control unit.
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At both ends of the lock bolt, there are provided a steel wire protecting member composed of a roughly-shaped " A " shape or an alphabet " T " or " + " shape for protecting the steel wire and a grooved- And the sealing member is formed so as not to be contacted.
As described above, according to the present invention, the reinforcing material is installed in a three-dimensional cubic shape in a poor quality zone or a weak zone in the ground to induce the ground confining force, thereby achieving a much stronger ground reinforcement than the conventional one.
In addition, the present invention has the effect of restricting the space utilization because the underground space other than the necessary portion can be removed by restricting the section serving as a column in the underground space in the form of a three-dimensional cube.
In addition, since the present invention can utilize the rock bolt pre-installed as it is, it is easy to repair and reinforce it, and if necessary, it can improve the ground restraint stress by additional reinforcement, so that it can flexibly cope with the relaxation of the ground layer, There is an effect.
In addition, the present invention can be applied as a reinforcing method when adjacent tunnel excavation and near-proximity tunnel evacuation are performed in a weak zone of stratum, and further reinforcement and maintenance can be easily performed in a required section.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart schematically showing a procedure of a ground reinforcement method for an underground space according to the present invention.
2 is a schematic view of a ground reinforcement according to the present invention.
FIGS. 3 to 8 are diagrams showing the steps of the main tunnel tunneling, the steel pipe installation, and the branch tunnel excavation.
9 and 10 are views schematically showing a state in which a steel pipe and a steel wire are fastened using a fastener so as to form a horizontal plane using the ground reinforcement according to the present invention.
FIGS. 11 to 15 are schematic views showing a state in which a steel wire is passed through a steel pipe according to the present invention to form a horizontal plane, a vertical plane and a diagonal plane to form a cubic shape as a whole.
16 and 17 are views showing a structure in which a curved portion of a steel pipe according to the present invention is detachably attached.
18 to 20 show another embodiment according to the present invention in which a steel wire having a ring formed in a rock bolt preliminarily installed in a steel pipe is inserted and a letter " A "Quot; -shaped " or " + " -shaped shape, and then fastened to the other end of the steel wire with a fastener to form a three-dimensional cube shape.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a method for reinforcing an underground space excavation weak ground according to the present invention will be described in more detail with reference to the accompanying drawings.
Hereinafter, the same reference numerals will be used to denote the same or similar elements in all of the following drawings, and repetitive descriptions will be omitted. The following terms are defined in consideration of the functions of the present invention. It should be interpreted as meaning.
First, the present invention is a method for reinforcing the ground of the excavation weakening part more firmly at the time of excavation, in addition to the juxtaposed tunnel, the tunnel underground branching section, the close juxtaposed tunnel section, and the underground tunnel.
As one example, in the present invention, a method of reinforcing a ground of a drill-weakened portion when constructing a close-coupled tunnel will be described with reference to FIGS. 1 to 17.
The method of reinforcing a ground of a weak excavation site according to the present invention includes a tunnel excavation step S210, a ground reinforcement hole boring step S220, a steel pipe inserting and grouting step S230, a branch tunnel excavation step S240, ).
In the main tunnel tunneling step, pitheads (mining equipment, storage areas, offices, etc.) necessary for underground mining operations are installed at the site where the close-coupled tunnel is to be excavated, (S210)
At this time, when the excavation is completed to the required depth, the
Next, in the step of drilling the ground reinforcement material insertion hole, the upper, lower, left, and right gaps are formed in the direction in which the
Here, it is preferable that the penetration of the ground reinforcement material insertion hole H is formed to a depth that can penetrate the one excavation surface of the
In the step of inserting and grouting the steel pipe, the
At this time, it is preferable that a sealing
That is, since the sealing
Accordingly, the grout is injected into the grooves or cavities of the ground or rock caused by excavation or boring by the grouting operation, and the gap between the wall surface of the ground reinforcement material insertion hole H and the outer surface of the
The
In more detail, the
The reason why the
That is, when both ends of the
When the
The
The
In addition, the
The
In addition, the
The sealing
When the excavation of the
The branch tunnel excavation step excavates the
At this time, a plurality of ground reinforcement material insertion holes H, which are perforated so as to have an upward, downward, left, and right spacing in a direction in which the
When the excavation of the
The
A plurality of ground reinforcement material insertion holes H perforated upward, downward, left, and right so as to pass through one side of the
For example, after the one
The
Then, another
That is, in the step of installing a steel wire according to the present invention, a tensile force is introduced into the
The
As a result, the
18 to 20 show another embodiment according to the present invention. In the steel pipe insertion and steel wire installation step, a rock bolt (not shown) provided in addition to the
That is, a
A sealing
Next, the
As a result, it is easy to repair and reinforce the close-coupled tunnel constructed in the past, and it is possible to increase the restrained stress through additional reinforcement if necessary, so that the stability can be improved by flexibly coping with the relaxation of the ground layer, You can.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. And will be apparent to those skilled in the art to which the invention pertains.
10: main tunnel 11: excavation surface
12: shotcrete 13:
20: branch tunnel 21: excavation surface
22: shotcrete 23:
100: Ground reinforcement material 110: Steel pipe
110a: male screw 111:
111a: Female thread 120: Steel wire
121: fastening part 130: fastening part
140: sealing member 150: locking bolt
160: Steel wire harness H: Ground reinforcement insert hole
Claims (7)
A steel wire passing through the steel pipe is formed to form a three-dimensional cubic shape by forming a horizontal plane, a vertical plane and a diagonal plane, or a steel wire having a loop formed in the rock bolt is provided and a steel wire protector is installed on one side of the steel wire, A step of fastening a fastening part formed at the other end of the steel wire with a fastening part to form a three-dimensional cube; Wherein the ground reinforcement weakening portion is grounded.
At both ends of the lock bolt, there are provided a steel wire protecting member composed of a roughly-shaped " A " shape or an alphabet " T " or " + " shape for protecting the steel wire and a grooved- Wherein the closure member is formed to prevent the ground member from being damaged.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150088317A KR101674811B1 (en) | 2015-06-22 | 2015-06-22 | An Reinforcement Method for Weak Area in Underground Space Excavation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150088317A KR101674811B1 (en) | 2015-06-22 | 2015-06-22 | An Reinforcement Method for Weak Area in Underground Space Excavation |
Publications (1)
Publication Number | Publication Date |
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KR101674811B1 true KR101674811B1 (en) | 2016-11-10 |
Family
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Family Applications (1)
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KR1020150088317A KR101674811B1 (en) | 2015-06-22 | 2015-06-22 | An Reinforcement Method for Weak Area in Underground Space Excavation |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190049012A (en) | 2017-11-01 | 2019-05-09 | 롯데건설 주식회사 | Bracket for ground reinforcement |
KR20190110070A (en) | 2019-05-13 | 2019-09-27 | (주)하경엔지니어링 | Construction method of close parallel tunnel for excavating and reinforcing tunnel pillar portion according to ground conditions |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4946315A (en) * | 1988-12-13 | 1990-08-07 | Chugh Yoginder P | Mine roof system |
US5462391A (en) * | 1994-01-24 | 1995-10-31 | Scott Investment Partners | Mine roof support cribbing system |
KR100682556B1 (en) | 2005-12-28 | 2007-02-15 | 김현래 | Ground reinforcement method and device thereof |
KR101096664B1 (en) * | 2011-06-15 | 2011-12-23 | 주식회사 성우사면 | Construction method of approaching duel tunnel and pressing unit of pillar using the same |
KR101402267B1 (en) * | 2013-09-16 | 2014-06-02 | 주식회사 성우사면 | Close juxtaposition tunnel pillar reinforcement structure and its construction methods |
-
2015
- 2015-06-22 KR KR1020150088317A patent/KR101674811B1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4946315A (en) * | 1988-12-13 | 1990-08-07 | Chugh Yoginder P | Mine roof system |
US5462391A (en) * | 1994-01-24 | 1995-10-31 | Scott Investment Partners | Mine roof support cribbing system |
KR100682556B1 (en) | 2005-12-28 | 2007-02-15 | 김현래 | Ground reinforcement method and device thereof |
KR101096664B1 (en) * | 2011-06-15 | 2011-12-23 | 주식회사 성우사면 | Construction method of approaching duel tunnel and pressing unit of pillar using the same |
KR101402267B1 (en) * | 2013-09-16 | 2014-06-02 | 주식회사 성우사면 | Close juxtaposition tunnel pillar reinforcement structure and its construction methods |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190049012A (en) | 2017-11-01 | 2019-05-09 | 롯데건설 주식회사 | Bracket for ground reinforcement |
KR20190110070A (en) | 2019-05-13 | 2019-09-27 | (주)하경엔지니어링 | Construction method of close parallel tunnel for excavating and reinforcing tunnel pillar portion according to ground conditions |
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