CN102200018A - Bearing structure for reinforcing tunnel - Google Patents
Bearing structure for reinforcing tunnel Download PDFInfo
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- CN102200018A CN102200018A CN2011101197511A CN201110119751A CN102200018A CN 102200018 A CN102200018 A CN 102200018A CN 2011101197511 A CN2011101197511 A CN 2011101197511A CN 201110119751 A CN201110119751 A CN 201110119751A CN 102200018 A CN102200018 A CN 102200018A
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Abstract
The invention discloses a bearing structure for reinforcing a tunnel. The bearing structure comprises a secondary-lining low wall (4) at the tunnel springing and an arched support structure supported by the secondary-lining low wall (4), wherein the arched support structure comprises a permanent bearing structure layer (5) and a strengthening structure layer (3); the permanent bearing structure layer (5) is supported below the rock body on the inner wall of the tunnel; and the strengthening structure layer (3) is supported below the permanent bearing structure layer (5) and formed by high-strength powder concrete placing. The bearing structure disclosed by the invention has the advantages of good reinforcing effect, low cost and the like, is simple to construct and convenient to operate, and can effectively improve the safety and economy of tunnel construction.
Description
Technical field
The invention belongs to the tunnel construction technology field, relate in particular to the reinforcing structure during a kind of constructing tunnel.
Background technology
In the mountain tunnel or underground construction of drill bursting construction, in the relatively poor barrel location of country rock, because actual country rock and design conditions be not inconsistent, it is excessive to cause in the work progress preliminary bracing to be out of shape, and rate of deformation is excessive.For preventing landslide, usually adopt bilayer or composite steel bow member to add strong supporting, promptly on the basis of former " pneumatically placed concrete+steel bow member ", increase the supporting and protection structure of one deck or two-layer " pneumatically placed concrete+steel bow member " again at skin, in order to keep the preliminarily stabilised of country rock.Because the supporting and protection structure layer that increases newly has been occupied intrinsic secondary lining position, this just causes the secondary liner structure layer thin excessively, thereby can't adopt ordinary concrete cast secondary lining, also is difficult to satisfy force request.At this technical problem, generally take to remove the supporting and protection structure of " pneumatically placed concrete+steel bow member " of invading the secondary lining design attitude at present, apply secondary lining more again.Before the steel bow member of removing supporting and protection structure, generally need carry out grouting and reinforcing to the country rock body, and for avoiding the excessive disturbance of tunnel surrounding, need be by Pin with manually removing the steel bow member, the method expense that wastes time and energy is expected, and is had bigger potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provides that a kind of construction technology is simple, easy to operate, consolidation effect is good, cost is low and can effectively improve the tunnel reinforcement bearing structure of safety for tunnel engineering and economy.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of tunnel reinforcement bearing structure, described tunnel reinforcement comprises two short abutment walls of lining that are positioned at arch springing place, tunnel and the arch support structure that is supported by the short abutment wall of this two lining with bearing structure, described arch support structure comprises permanent bearing structure layer and reinforcing structure layer, described permanent bearing structure layer is supported on inwall rock mass below, tunnel, and described reinforcing structure layer is supported on described permanent bearing structure layer below; Described reinforcing structure layer is to be built by high-strength powder concrete to form.
Above-mentioned tunnel reinforcement is with in the bearing structure, and described permanent bearing structure layer preferably includes supporting and protection structure layer that is supported on inwall rock mass below, tunnel and the secondary supporting deck that is supported on this supporting and protection structure layer below; The sprayed mortar structure of steely bow member in described supporting and protection structure layer and secondary supporting deck all preferably are set to.
Above-mentioned tunnel reinforcement is with in the bearing structure, and described secondary supporting deck preferably includes first floor steel bow member concrete structure layer that is supported on described supporting and protection structure layer below and the second layer steel bow member concrete structure layer that is supported on first floor steel bow member concrete structure layer below.
Above-mentioned tunnel reinforcement is with in the bearing structure, and described high-strength powder concrete is preferably by cement, silicon ash, flyash, the nanometer SiO of following mass fraction
2, quartz powder, quartz sand, water reducing agent mixes with water and in this compound, mix the copper plated steel fiber after prepare and obtain:
100 parts of cement
20～30 parts of silicon ashes
10～12 parts in flyash
Nanometer SiO
20.1～0.12 part
18～22 parts of quartz powders
110～130 parts of quartz sands
1.5～1.8 parts of water reducing agents.
Above-mentioned tunnel reinforcement is with in the bearing structure, and the gross mass of described cement and silicon ash and the mass ratio of described water are preferably 5～6.
Above-mentioned tunnel reinforcement is with in the bearing structure, and the addition of described copper plated steel fiber is preferably by 1%～3% of described mixture volume.
Above-mentioned tunnel reinforcement is with in the bearing structure, and the thickness of described reinforcing structure layer is preferably 4cm～12cm.
Compared with prior art, the invention has the advantages that: the present invention utilize the former supporting and protection structure that applies (pneumatically placed concrete+steel bow member) and the secondary supporting structure of setting up as the permanent bearing structure layer in tunnel, the laminate structure of high-strength powder concrete cast that adopts high workability again is as the reinforcing structure layer of permanent bearing structure, because this reinforcing structure layer has very high resistance to compression and bend resistance ability, the bearing structure that itself and permanent bearing structure layer are used as tunnel reinforcement jointly, the density of this bearing structure is good, have very high impermeability, improved the durability of tunnel bearing structure greatly.
Generally speaking, not only construction technology is simple, easy to operate with bearing structure for tunnel reinforcement of the present invention, and consolidation effect is very desirable, and construction cost is lower, can improve constructing tunnel and operation process safe and economy greatly.
Description of drawings
Fig. 1 is the schematic diagram of the bearing structure that obtains in the embodiment of the invention after reinforcement means is reinforced.
Fig. 2 is the partial enlarged drawing at A place among Fig. 1.
Marginal data
1, supporting and protection structure layer; 2, secondary supporting deck; 21, first floor steel bow member concrete structure layer; 22, second layer steel bow member concrete structure layer; 3, reinforcing structure layer; 4, the short abutment wall of two linings; 5, permanent bearing structure layer.
The specific embodiment
Below in conjunction with Figure of description and specific embodiment the present invention is further described.
Embodiment
As shown in Figure 1, in the work progress in a certain tunnel, applied the supporting and protection structure layer 1 of " pneumatically placed concrete+steel bow member " at vault, but at the construction initial stage because the distortion of supporting and protection structure layer 1 is excessive, and rate of deformation is excessive, has therefore adopted tunnel reinforcement of the present invention with bearing structure this tunnel to be reinforced.
The tunnel reinforcement of present embodiment comprises two short abutment walls 4 of lining that are positioned at arch springing place, tunnel and the arch support structure that is supported by the short abutment wall 4 of this two lining with bearing structure, this arch support structure comprises permanent bearing structure layer 5 and reinforcing structure layer 3, permanent bearing structure layer 5 is supported on inwall rock mass below, tunnel, and reinforcing structure layer 3 is supported on permanent bearing structure layer 5 below; Reinforcing structure layer 3 is to be built by high-strength powder concrete to form.The thickness of reinforcing structure layer 3 is 6cm.
Permanent bearing structure layer 5 comprises supporting and protection structure layer 1 that is supported on inwall rock mass below, tunnel and the secondary supporting deck 2 that is supported on this supporting and protection structure layer 1 below; The sprayed mortar structure of steely bow member in supporting and protection structure layer 1 and secondary supporting deck 2 all are set to.Secondary supporting deck 2 comprises first floor steel bow member concrete structure layer 21 that is supported on supporting and protection structure layer 1 below and the second layer steel bow member concrete structure layer 22 that is supported on first floor steel bow member concrete structure layer 21 below.
The tunnel reinforcement of present embodiment mainly is to obtain by following reinforcement means construction with bearing structure:
(1) sets up the steel bow member: when supporting and protection structure layer 1 distortion at this constructing tunnel initial stage is excessive, set up two-layer steel bow member concrete structure layer (being first floor steel bow member concrete structure layer 21 and second layer steel bow member concrete structure layer 22) in supporting and protection structure layer 1 outside, make supporting and protection structure layer 1 and secondary supporting deck 2 bear pressure from surrounding rock jointly, to guarantee safety.
(2) surfacing: the distance to profile in secondary supporting deck 2 and the tunnel is measured, according to measurement result, in range finding from the scope of operation greater than 12cm, hang individual layer steel mesh reinforcement (Φ 6mm) earlier, spray the leveling of C20 concrete again, and reserve the reinforcing structure layer cast thickness of 10cm～12cm; In the scope of operation of distance less than 4cm, then cut portion C 20 sprayed mortars, be at least 4cm with the thickness that guarantees reinforcing structure layer 3 cast.
(3) prepare high-strength powder concrete: get cement, silicon ash, flyash, nanometer SiO by following mass fraction
2, quartz powder, quartz sand, water reducing agent and water mixes:
100 parts of cement
20 parts of silicon ashes
10 parts in flyash
Nanometer SiO
20.1 part
20 parts of quartz powders
110 parts of quartz sands
1.5 parts of water reducing agents
20 parts in water;
Stir the back and add the copper plated steel fiber in compound, the addition of copper plated steel fiber is by 2% of above-mentioned mixture volume, and preparation obtains high-strength powder concrete, and the Specifeca tion speeification index of the high-strength powder concrete that the inventive method makes is as follows:
The slump: 260 mm～280 mm
Slump divergence: 600 mm～800 mm
Apparent density: 2400 kg/m
3～2600 kg/m
3
Compressive strength: 〉=120Mpa
Rupture strength: 〉=20Mpa
Modulus of elasticity: 〉=40GPa
Impervious grade: 〉=P500
Freeze proof grade: 〉=F600
Electric flux :≤40C
Noninflammability: meet GB8624A level noninflammability building materials.
(4) pour into a mould high-strength powder concrete: the high-strength powder concrete that utilizes the tunnel double-lining chassis to prepare in the perfusion of above-mentioned secondary supporting deck 2 outsides, under the situation of not invading clearance of tunnel, make secondary supporting deck 2 outsides form reinforcing structure layer 3, the thickness of reinforcing structure layer 3 is 6cm, finish strengthening construction, obtain tunnel reinforcement bearing structure as shown in Figure 1 and Figure 2, whole bearing structure serves as a contrast short abutment wall 4 supports by two of tunnel bottom, and in aggregates with short abutment wall 4 cast of two linings.Two ends at this bearing structure respectively are provided with ring direction drainpipe with the centre position.
Claims (8)
1. tunnel reinforcement bearing structure, described tunnel reinforcement comprises two lining short abutment walls (4) that are positioned at arch springing place, tunnel and the arch support structure that is supported by this two short abutment wall of lining (4) with bearing structure, it is characterized in that: described arch support structure comprises permanent bearing structure layer (5) and reinforcing structure layer (3), described permanent bearing structure layer (5) is supported on inwall rock mass below, tunnel, and described reinforcing structure layer (3) is supported on described permanent bearing structure layer (5) below; Described reinforcing structure layer (3) is to be built by high-strength powder concrete to form.
2. tunnel reinforcement bearing structure according to claim 1 is characterized in that: described permanent bearing structure layer (5) comprises supporting and protection structure layer (1) that is supported on inwall rock mass below, tunnel and the secondary supporting deck (2) that is supported on this supporting and protection structure layer (1) below; The sprayed mortar structure of steely bow member in described supporting and protection structure layer (1) and secondary supporting deck (2) all are set to.
3. tunnel reinforcement bearing structure according to claim 2 is characterized in that: described secondary supporting deck (2) comprises first floor steel bow member concrete structure layer (21) that is supported on described supporting and protection structure layer (1) below and the second layer steel bow member concrete structure layer (22) that is supported on first floor steel bow member concrete structure layer (21) below.
4. according to claim 1,2 or 3 described tunnel reinforcement bearing structures, it is characterized in that described high-strength powder concrete is by the cement of following mass fraction, silicon ash, flyash, nanometer SiO
2, quartz powder, quartz sand, water reducing agent mixes with water and in this compound, mix the copper plated steel fiber after prepare and obtain:
100 parts of cement
20～30 parts of silicon ashes
10～12 parts in flyash
Nanometer SiO
20.1～0.12 part
18～22 parts of quartz powders
110～130 parts of quartz sands
1.5～1.8 parts of water reducing agents.
5. tunnel reinforcement bearing structure according to claim 4 is characterized in that, the gross mass of described cement and silicon ash and the mass ratio 5～6 of described water.
6. tunnel reinforcement bearing structure according to claim 5 is characterized in that the addition of described copper plated steel fiber is by 1%～3% of described mixture volume.
7. tunnel reinforcement bearing structure according to claim 6 is characterized in that, the thickness of described reinforcing structure layer (3) is 4cm～12cm.
8. according to claim 1,2 or 3 described tunnel reinforcement bearing structures, it is characterized in that the thickness of described reinforcing structure layer (3) is 4cm～12cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110119751 CN102200018B (en) | 2011-05-10 | 2011-05-10 | Bearing structure for reinforcing tunnel |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN 201110119751 CN102200018B (en) | 2011-05-10 | 2011-05-10 | Bearing structure for reinforcing tunnel |
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| CN102200018A true CN102200018A (en) | 2011-09-28 |
| CN102200018B CN102200018B (en) | 2013-07-10 |
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| CN 201110119751 Active CN102200018B (en) | 2011-05-10 | 2011-05-10 | Bearing structure for reinforcing tunnel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345463A (en) * | 2011-10-19 | 2012-02-08 | 中交第一公路工程局有限公司 | Support structure for large-span shallow-buried underground tunnel in urban sensitive area |
| CN103224365A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN104314588A (en) * | 2014-07-02 | 2015-01-28 | 北京工业大学 | Strengthening method for arranging support inside shield tunnel |
| CN104481551A (en) * | 2014-11-17 | 2015-04-01 | 大同煤矿集团有限责任公司 | Supporting method for carboniferous soft coal seam |
| CN104631347A (en) * | 2015-01-26 | 2015-05-20 | 北京市市政工程研究院 | Strengthening method for subway station tunnel and bridge structures along subway station tunnel |
| CN104806266A (en) * | 2015-04-01 | 2015-07-29 | 山东大学 | Novel wall back combining filling structure and construction process thereof |
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| JP2008057210A (en) * | 2006-08-31 | 2008-03-13 | Okumura Corp | Method and structure for placing tunnel lining concrete |
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| CN202125301U (en) * | 2011-05-10 | 2012-01-25 | 湖南省交通规划勘察设计院 | Bearing structure for reinforcing tunnel |
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2011
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| JP2008057210A (en) * | 2006-08-31 | 2008-03-13 | Okumura Corp | Method and structure for placing tunnel lining concrete |
| JP2008223335A (en) * | 2007-03-13 | 2008-09-25 | Kajima Corp | Tunnel reinforcing method by use of fiber reinforced cement board |
| CN201738254U (en) * | 2010-08-09 | 2011-02-09 | 中铁第一勘察设计院集团有限公司 | Buffering structure for buffering micro-pressure wave at high-speed railway tunnel portal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345463A (en) * | 2011-10-19 | 2012-02-08 | 中交第一公路工程局有限公司 | Support structure for large-span shallow-buried underground tunnel in urban sensitive area |
| CN103224365A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN103224365B (en) * | 2013-04-16 | 2015-04-22 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN104314588A (en) * | 2014-07-02 | 2015-01-28 | 北京工业大学 | Strengthening method for arranging support inside shield tunnel |
| CN104481551A (en) * | 2014-11-17 | 2015-04-01 | 大同煤矿集团有限责任公司 | Supporting method for carboniferous soft coal seam |
| CN104631347A (en) * | 2015-01-26 | 2015-05-20 | 北京市市政工程研究院 | Strengthening method for subway station tunnel and bridge structures along subway station tunnel |
| CN104806266A (en) * | 2015-04-01 | 2015-07-29 | 山东大学 | Novel wall back combining filling structure and construction process thereof |
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| Publication number | Publication date |
|---|---|
| CN102200018B (en) | 2013-07-10 |
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Address after: 410008 No. two, Furong North Road, Changsha, Hunan, 158 Patentee after: Hunan Traffic Planning Survey and Design Institute Co Ltd Address before: 410008 No. two, Furong North Road, Changsha, Hunan, 158 Patentee before: Hunan Communication Planning and Prospecting Design Academy |
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