CN112727493A - Lining structure for reinforcing steel bars of facing of karst tunnel secondary lining plain concrete section - Google Patents
Lining structure for reinforcing steel bars of facing of karst tunnel secondary lining plain concrete section Download PDFInfo
- Publication number
- CN112727493A CN112727493A CN202011608406.XA CN202011608406A CN112727493A CN 112727493 A CN112727493 A CN 112727493A CN 202011608406 A CN202011608406 A CN 202011608406A CN 112727493 A CN112727493 A CN 112727493A
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- Prior art keywords
- limb
- lining
- grid
- karst tunnel
- plain concrete
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Links
- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims description 20
- 239000011435 rock Substances 0.000 claims description 7
- 210000003205 muscle Anatomy 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/20—Special cross- sections, e.g. corrugated
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/28—Longitudinal struts, i.e. longitudinal connections between adjoining arches
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a lining structure for adding a facing steel bar to a secondary lining plain concrete section of a karst tunnel, which comprises three-limb grid positioning steel frames at two sides of an annular construction joint of II-level and III-level surrounding plain concrete sections of the karst tunnel, longitudinal connecting bars arranged between the three-limb grid positioning steel frames and a facing steel bar net; the facing reinforcing mesh is arranged in the range of 142 degrees 39 '24' of the arch part, and the spacing between the reinforcing meshes is 20cmX20 cm; the circumferential distance of the longitudinal connecting ribs is 2m, and the installation distance of the three-limb grating positioning steel frame takes the length of the trolley as a unit. The lining structure of the facing steel bars is added to the secondary lining plain concrete section of the karst tunnel with the structure, so that the safety of the lining structure of the karst tunnel is enhanced, the risk of lining falling under the repeated action of positive pressure and negative pressure in the operation period is reduced, the operation safety of the karst tunnel is effectively ensured, and the process has the advantages of simplicity, convenience and the like.
Description
Technical Field
The invention relates to the technical field of tunnel lining structures, in particular to a lining structure for adding a protective steel bar to a karst tunnel secondary lining plain concrete section.
Background
The technical problems that the secondary lining plain concrete sections of a soluble rock vertical seepage zone, a seasonal change zone, a horizontal circulation zone and a deep slow flow zone in the conventional karst tunnel ensure the safety of a karst tunnel lining structure and reduce the risk of lining falling blocks due to the repeated action of positive pressure and negative pressure in an operation period and the like need to be solved in the field of tunnel lining. In the prior art, a 'drainage-oriented' karst water treatment principle is implemented in a karst tunnel, drainage and pressure relief measures of arch walls and inverted arches of a main tunnel are enhanced, drainage and pressure reduction are carried out by fully utilizing a horizontal guide tunnel, a drainage tunnel or a transverse channel, and the problem that a lining of the main tunnel bears overhigh water pressure is prevented; and in addition, the construction method has the defects and shortcomings that the construction method still bears overhigh water pressure in a karst section with developed karst water and unsmooth drainage, the phenomena of cracking and block falling still occur in the operation period, and the operation safety is influenced. In view of the above, it is necessary to design a lining structure of a karst tunnel secondary lining plain concrete section with additional facing steel bars.
Disclosure of Invention
The invention aims to provide a lining structure for adding a facing steel bar to a secondary lining plain concrete section of a karst tunnel, which enhances the safety of the lining structure of the karst tunnel, reduces the risk of lining falling due to repeated action of positive pressure and negative pressure in an operation period and the like, effectively ensures the operation safety of the karst tunnel, and has the advantages of simplicity, convenience and the like.
In order to achieve the aim, the invention provides a lining structure for adding a facing steel bar to a secondary lining plain concrete section of a karst tunnel, which comprises three-limb grid positioning steel frames at two sides of an annular construction joint of II-level and III-level surrounding plain concrete sections of the karst tunnel, longitudinal connecting bars arranged between the three-limb grid positioning steel frames and a facing steel bar net;
the facing reinforcing mesh is arranged in the range of 142 degrees 39 '24' of the arch part, and the spacing between the reinforcing meshes is 20cmX20 cm;
the circumferential distance of the longitudinal connecting ribs is 2m, and the installation distance of the three-limb grating positioning steel frame takes the length of the trolley as a unit.
Preferably, each ring of the three-limb grid positioning steel frame consists of an A unit, two B units and two C units, the two C units are respectively arranged at the lower sides of the two B units, the two B units are respectively arranged at two sides of the A unit, and the A unit and the B unit, and the B unit and the C unit are connected through I-shaped joints.
Preferably, the distance between the centers of the three-limb grid positioning steel frames and the circumferential construction joint is 50cm, and the longitudinal distance between every two adjacent three-limb grid positioning steel frames is 2.2m and the three-limb grid positioning steel frames are uniformly arranged.
Preferably, the three-limb grid positioning steel frame consists of three-limb grid steel frame main reinforcements, connection reinforcements and stirrups, the stirrups are bound at the outer sides of the three-limb grid steel frame main reinforcements, and two adjacent three-limb grid steel frame main reinforcements are connected through the connection reinforcements.
Preferably, the three-limb grid positioning steel frame is connected at a low side wall according to binding, three connecting steel bars are reserved at the side wall construction joint at the foot of the three-limb grid positioning steel frame, the connecting steel bars are consistent with the diameter and the plane arrangement of the main steel bars of the three-limb grid steel bars, and the embedding depth and the exposure length of the connecting steel bars are not less than 60 cm.
Preferably, the binding and overlapping length of the main reinforcement of the three-limb grid steel frame and the connecting reinforcement is not less than 60 cm.
Preferably, the unit I-shaped joint consists of angle steel and a bolt hole, and the angle steel is fixed on the bolt hole through a bolt and a nut.
Therefore, the lining structure of the facing steel bars is added to the secondary lining plain concrete section of the karst tunnel with the structure, the lining structure safety of the karst tunnel is enhanced, the risk of lining falling due to repeated action of positive pressure and negative pressure in the operation period is reduced, the operation safety of the karst tunnel is effectively ensured, and meanwhile, the process has the advantages of simplicity, convenience and the like.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a cross-sectional view of reinforcing meshes of lining arch wall facing of second-level and third-level surrounding rock plain concrete sections of a karst tunnel;
FIG. 2 is an elevation view of the mounting of a three-leg grid positioning steel frame;
FIG. 3 is a cross-sectional view taken along line I-I of the inside of the three-limb grid spacer bar;
FIG. 4 is a sectional view of an installation elevation II-II of a three-limb grid positioning steel frame;
FIG. 5 is a cross-sectional view of a three-leg grid positioning steel frame;
FIG. 6 is a plan view of the unit I-joint of the three-limb grid positioning steel frame;
FIG. 7 is a cross-sectional view of the unit I-joint plane I-I of the three-limb grid positioning steel frame;
FIG. 8 is a sectional view of the unit I-joint plane II-II of the three-limb grid positioning steel frame.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Examples
Fig. 1 is a cross-sectional view of a concrete section lining arch wall facing reinforcing mesh of karst tunnels of class ii and class iii surrounding rock plain concrete, fig. 2 is an installation elevation of a three-limb grid positioning steel frame, fig. 3 is a section view of the installation inside of the three-limb grid positioning steel bar, fig. 4 is a section view of the installation elevation of the three-limb grid positioning steel frame, fig. 5 is a structural cross-sectional view of the three-limb grid positioning steel frame, fig. 6 is a plan view of a unit type I joint of the three-limb grid positioning steel frame, fig. 7 is a section view of the unit type I joint of the three-limb grid positioning steel frame, and fig. 8 is a section view of the unit type I joint of the three-limb grid positioning steel frame. As shown in the figure, the invention provides a lining structure for adding a facing steel bar to a secondary lining plain concrete section of a karst tunnel, which comprises three-limb grid positioning steel frames 1 on two sides of an annular construction joint of II-level and III-level surrounding plain concrete sections of the karst tunnel, longitudinal connecting bars 2 arranged between the three-limb grid positioning steel frames 1 and a facing steel bar net 3; the facing reinforcing mesh 3 is arranged in the range of 142 degrees 39' 24 "of the arch part, and the spacing between the reinforcing meshes is 20cmX20 cm; the circumferential distance of the longitudinal connecting ribs 2 is 2m, and the installation distance of the three-limb grid positioning steel frame 1 takes the length of a trolley as a unit. The invention effectively solves the technical problems that secondary lining of second-level and third-level surrounding rock plain concrete sections of the karst tunnel is easy to crack and fall blocks and affects the operation safety after opening.
Each ring of the three-limb grid positioning steel frame 1 consists of an A unit 11, two B units 12 and two C units 13, the two C units 13 are respectively arranged at the lower sides of the two B units 12, the two B units 12 are respectively arranged at the two sides of the A unit 11, and the A unit 11 and the B unit 12, and the B unit 12 and the C unit 13 are connected through a unit I-shaped joint 4.
The distance between the centers of the three-limb grid positioning steel frames 1 and the circumferential construction joints is 50cm, and the longitudinal distance between two adjacent three-limb grid positioning steel frames 1 is 2.2m and is uniformly arranged. The three-limb grid positioning steel frame 1 is composed of three-limb grid steel frame main reinforcements 101, connection reinforcements 102 and stirrups 103, the stirrups 103 are bound on the outer sides of the three-limb grid steel frame main reinforcements 101, and two adjacent three-limb grid steel frame main reinforcements 101 are connected through the connection reinforcements 102.
The three-limb grid positioning steel frame 1 is connected at the short side wall by binding, three connecting steel bars are reserved at the construction joints of the side wall 5 at the foot of each three-limb grid positioning steel frame 1, the diameters and the planes of the connecting steel bars and the main steel bars 101 of the three-limb grid are all consistent, and the embedding depth and the exposure length of the connecting steel bars are not less than 60 cm. The length of the binding and overlapping of the main ribs 101 of the three-limb grid steel frame and the connecting steel bars is not less than 60cm, the positioning of the three-limb grid positioning steel frame is accurate, and the thickness of the net protective layer of the facing reinforcing mesh is ensured to meet the requirement of 50 mm.
The unit I-joint 4 is composed of an angle steel 41 and a bolt hole 42, and the angle steel 41 is fixed to the bolt hole 42 by a bolt 43 and a nut 44.
Compared with the prior art, the technology of the invention can increase the facing steel bars in the secondary lining plain concrete sections of the second-level and third-level surrounding rocks of the soluble rock vertical seepage zone, the seasonal variation zone, the horizontal circulation zone and the deep slow flow zone in the karst tunnel, has reinforced lining structure and can bear certain water pressure, integrally enhances the safety of the lining structure of the karst tunnel by combining reliable drainage measures, reduces the risks of cracking, falling blocks and the like of the lining easily caused by the repeated action of positive pressure and negative pressure in the operation period, effectively ensures the operation safety of the karst tunnel, and has the advantages of simplicity, convenience and the like.
Therefore, the lining structure of the facing steel bars is added to the secondary lining plain concrete section of the karst tunnel with the structure, the lining structure safety of the karst tunnel is enhanced, the risk of lining falling due to repeated action of positive pressure and negative pressure in the operation period is reduced, the operation safety of the karst tunnel is effectively ensured, and meanwhile, the process has the advantages of simplicity, convenience and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a lining cutting structure of plain concrete section of karst tunnel secondary lining increases armor reinforcing bar which characterized in that:
the three-limb grid positioning steel frame comprises three-limb grid positioning steel frames on two sides of annular construction joints of II-grade and III-grade surrounding rock plain concrete sections of a karst tunnel, longitudinal connecting ribs arranged between the three-limb grid positioning steel frames and a facing reinforcing mesh;
the facing reinforcing mesh is arranged in the range of 142 degrees 39 '24' of the arch part, and the spacing between the reinforcing meshes is 20cmX20 cm;
the circumferential distance of the longitudinal connecting ribs is 2m, and the installation distance of the three-limb grating positioning steel frame takes the length of the trolley as a unit.
2. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 1, characterized in that: each ring of the three-limb grid positioning steel frame is composed of an A unit, two B units and two C units, the two C units are respectively arranged at the lower sides of the two B units, the two B units are respectively arranged at the two sides of the A unit, and the A unit and the B unit, and the B unit and the C unit are connected through unit I-shaped joints.
3. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 2, characterized in that: the center distance of three limb grid positioning steelframes is 50cm to the hoop construction joint, and two adjacent three limb grid positioning steelframes's vertical interval is 2.2m, and evenly arranges.
4. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 3, characterized in that: the three-limb grid positioning steel frame is composed of three-limb grid steel frame main reinforcements, connection reinforcements and stirrups, the stirrups are bound on the outer sides of the three-limb grid steel frame main reinforcements, and two adjacent three-limb grid steel frame main reinforcements are connected through the connection reinforcements.
5. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 4, characterized in that: three limb grid location steelframes connect according to the ligature in low side wall department, every pin three connecting reinforcement are reserved to the side wall construction joint department of three limb grid location steelframe feet department, connecting reinforcement with the diameter and the planar arrangement of three limb grid reinforcing bar owner muscle are all unanimous, connecting reinforcement buries the degree of depth and exposes length and all is not less than 60 cm.
6. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 5, characterized in that: the binding and overlapping length of the main bar of the three-limb grid steel frame and the connecting steel bar is not less than 60 cm.
7. The lining structure of the reinforcing steel bars of the secondary lining plain concrete section of the karst tunnel according to claim 6, characterized in that: the unit I-shaped joint is composed of angle steel and a bolt hole, and the angle steel is fixed on the bolt hole through a bolt and a nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608406.XA CN112727493A (en) | 2020-12-30 | 2020-12-30 | Lining structure for reinforcing steel bars of facing of karst tunnel secondary lining plain concrete section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608406.XA CN112727493A (en) | 2020-12-30 | 2020-12-30 | Lining structure for reinforcing steel bars of facing of karst tunnel secondary lining plain concrete section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112727493A true CN112727493A (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011608406.XA Pending CN112727493A (en) | 2020-12-30 | 2020-12-30 | Lining structure for reinforcing steel bars of facing of karst tunnel secondary lining plain concrete section |
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| CN (1) | CN112727493A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201513181U (en) * | 2009-07-07 | 2010-06-23 | 中铁二院工程集团有限责任公司 | Anti-cracking lining structure of high-speed railway tunnel |
| CN203066989U (en) * | 2013-01-27 | 2013-07-17 | 黄浩川 | Lining structure for expressway tunnel |
| CN204754945U (en) * | 2015-06-23 | 2015-11-11 | 中铁二院工程集团有限责任公司 | Mine method tunnel preliminary bracing lining cutting grid steel support make |
| CN204941566U (en) * | 2015-08-10 | 2016-01-06 | 吉林铁道勘察设计院有限公司 | A kind of grid steel frame for reinforcing existing tunnel |
| CN210530874U (en) * | 2019-08-15 | 2020-05-15 | 中铁二院昆明勘察设计研究院有限责任公司 | Plate type grid steel frame for tunnel preliminary bracing |
| CN211038675U (en) * | 2019-09-16 | 2020-07-17 | 四川奥思特边坡防护工程有限公司 | Quickly-assembled supporting shed frame |
-
2020
- 2020-12-30 CN CN202011608406.XA patent/CN112727493A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201513181U (en) * | 2009-07-07 | 2010-06-23 | 中铁二院工程集团有限责任公司 | Anti-cracking lining structure of high-speed railway tunnel |
| CN203066989U (en) * | 2013-01-27 | 2013-07-17 | 黄浩川 | Lining structure for expressway tunnel |
| CN204754945U (en) * | 2015-06-23 | 2015-11-11 | 中铁二院工程集团有限责任公司 | Mine method tunnel preliminary bracing lining cutting grid steel support make |
| CN204941566U (en) * | 2015-08-10 | 2016-01-06 | 吉林铁道勘察设计院有限公司 | A kind of grid steel frame for reinforcing existing tunnel |
| CN210530874U (en) * | 2019-08-15 | 2020-05-15 | 中铁二院昆明勘察设计研究院有限责任公司 | Plate type grid steel frame for tunnel preliminary bracing |
| CN211038675U (en) * | 2019-09-16 | 2020-07-17 | 四川奥思特边坡防护工程有限公司 | Quickly-assembled supporting shed frame |
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