CN103195449A - Large-span heavy-load open cut tunnel pre-stressed reinforced concrete lining structure - Google Patents
Large-span heavy-load open cut tunnel pre-stressed reinforced concrete lining structure Download PDFInfo
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- CN103195449A CN103195449A CN2013101068187A CN201310106818A CN103195449A CN 103195449 A CN103195449 A CN 103195449A CN 2013101068187 A CN2013101068187 A CN 2013101068187A CN 201310106818 A CN201310106818 A CN 201310106818A CN 103195449 A CN103195449 A CN 103195449A
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Abstract
A large-span heavy-load open cut tunnel pre-stressed reinforced concrete lining structure aims at enabling an open cut tunnel to have large span and bear large load, and the tunnel lining construction quality is easy to control. The reinforced concrete lining structure (10) formed by formwork building comprises an arch portion (11), a left side wall (12), a right side wall (14) and an inverted arch (13), wherein pre-stressed members are arranged in a tension region of the reinforced concrete lining structure (10) along the extending direction of the open cut tunnel at intervals, and prestress is exerted on the reinforced concrete lining structure (10) through the pre-stressed members.
Description
Technical field
The present invention relates to the cut and cover tunneling tunnel of railway, highway, subway or municipal administration, particularly large span, heavy load, concrete in mass open cut tunnel structure.
Background technology
Consider to save construction costs, reserve planned land use, reduce requirements such as runing risk, in the design of railway, highway in high slope, crag falling rocks location or have planning to need and the paragraph that can't pass round adopts tunnel open cut tunnel scheme to pass through, especially build railway in the mountainous region, be subjected to the station setting requirement, often high backfill tunnel lining structure is striden in appearance greatly.The tunnel lining span develops into three lines, four threaded list roads by general single, double threaded list road, even multiple track tunnel more, follow the continuous breakthrough of tunnel span, tunnel open cut tunnel lining cutting backfill thickness and load are in continuous increase, the tunnel lining structure thickness that guarantees structural safety constantly increases, even the above super thick liner structure of 2m occurs.Stride greatly, the super mass concrete liner structure of high backfill load is faced with new challenges and new technical barrier at aspects such as distortion, safety, durability, need to be resolved hurrily about the construction technology problem of design parameterss such as super thick backfill super-span open cut tunnel sectional form, liner structure form and open cut tunnel.
The existing tunnel liner structure has composite lining or the lining cutting of monolithic open cut tunnel, double track tunnel composite lining structural thickness is generally less than 55cm, monolithic open cut tunnel liner structure thickness is generally less than 80cm, common lining design load is less, especially open cut tunnel lining design load is generally less than 4m backfill load, and the liner structure pattern all adopts solid concrete or single solid steel reinforced concrete section.Along with stride greatly, being on the increase of large cross-section tunnel construction, the continuous increase of tunnel lining design load makes the tunnel lining tradition build technology and the theoretical problem that faces is more and more.
Although China also took much count of the raising of tunnel open cut tunnel construction technique in nearly ten years, still there is not unified prospective design standard so far, similar engineering difference aspect design and construction is bigger.For protecting general falling rocks, collapse, highway tunnel design specifications (JTGD70-2004) the clearly regulation open cut tunnel thickness that bankets must not done requirement but push up maximum backfill thickness for open cut tunnel lining cutting hole less than 1.5m.Top, the hole of the regulation and stipulation thickness that bankets is not less than 1.5m, has only considered to bear the limit, has faced upward caving on a small quantity of slope, and when the limit, face upward the slope disease is arranged, then should suitably increase hole top backfill thickness to guarantee the stable and safety of open cut tunnel in the time of might taking place to cave in more greatly future.Often excavate preceding original landforms for recovering the hole in the actual engineering, even increase thickness of earth covering to reach certain building or engineering demand at original landforms.The thickness that bankets is pushed up in the hole to be increased, and will certainly increase top, top, hole load, causes the open cut tunnel liner structure to produce than big internal force.Engineering experience shows after the open cut tunnel top depth of fill is greater than 30 meters, the thickness of conventional section open cut tunnel lining cutting is often greater than 2m, be example with tunnel, loop wire dragon's cave-stalactite cave fort airport, hinge northeast, Kweiyang high backfill open cut tunnel liner structure research, adopt traditional arch open cut tunnel liner structure of clear span 25m backfill height 33m, as adopt conventional design, the arch lining thickness need reach 2.6m, and the inverted arch place then reaches 2.8m, and adopts the reinforcement arrangement of reinforcement could satisfy requirement for bearing capacity.And this almost can not practice in actual engineering, and it belongs to concrete in mass, concrete in mass is thicker, the construction casting difficulty is big, construction quality is restive, and the concrete coefficient of thermal conductivity is smaller, tend to cause thermal cracking, the concrete in mass tunnel lining structure is difficult to satisfy safety of structure and life requirement.
This shows that banket when higher in big and top when open cut tunnel lining cutting span, even the open cut tunnel section is carried out global optimization, still can produce bigger internal force to the open cut tunnel lining cutting is inner inevitably.If increase lining thickness simply, both caused a large amount of bricklaying wastes, can produce big thermal cracking again because the concrete in mass heat of hydration can't effectively eliminate, cause open cut tunnel lining cutting durability to be protected.
Summary of the invention
Technical problem to be solved by this invention provides a kind of large span heavy load open cut tunnel prestressed reinforced concrete liner structure, so that open cut tunnel has bigger span and bear bigger load, and the tunnel lining construction quality is easy to control.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention, mould is built the reinforced concrete lining layer structure that forms and is comprised arch, left side abutment wall, right side abutment wall and inverted arch, it is characterized in that: along the open cut tunnel bearing of trend prestressed member is set at interval in the tensile region of described reinforced concrete lining layer structure, by prestressed member the reinforced concrete lining layer structure is applied prestressing force.
The invention has the beneficial effects as follows, by the main body of the prestressed member that is arranged on reinforced concrete lining layer structure tensile region as structural bearing, offset the inner tensile stress of lining cutting that part is produced by outside backfill load and dead load, open cut tunnel structural entity intensity is greatly improved, changed the single force way of conventional lining, can make the open cut tunnel span bigger and bear heavier load; Can control the design thickness of tunnel lining effectively and carry out with imitating ground control Tunnel Lining Cracks, make the tunnel lining construction quality be easy to control, for the development of large span, high strength underground construction provides a kind of new form of structure; Easily construction is easy to promote.
Description of drawings
This manual comprises following four width of cloth accompanying drawings:
Fig. 1 is the profile of large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention;
Fig. 2 is the enlarged diagram of B part among Fig. 1;
Fig. 3 is the sectional view along A-A line among Fig. 1.
Fig. 4 is the arrangement schematic diagram of the prestressed member of large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention.
Zero member, toponym and corresponding mark among the figure: arch 11, left side abutment wall 12, inverted arch 13, right side abutment wall 14; Arc is to prestressing force assembly 21, left side vertical prestressing assembly 22, right side vertical prestressing assembly 23.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
With reference to Fig. 1 and Fig. 4, large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention, mould is built the reinforced concrete lining layer structure 10 that forms and is comprised arch 11, left side abutment wall 12, right side abutment wall 14 and inverted arch 13.Along the open cut tunnel bearing of trend prestressed member is set at interval in the tensile region of described reinforced concrete lining layer structure 10, by prestressed member reinforced concrete lining layer structure 10 is applied prestressing force.Prestressed member is as the main body of structural bearing, offset the inner tensile stress of lining cutting that part is produced by outside backfill load and dead load, open cut tunnel structural entity intensity is greatly improved, changed the single force way of conventional lining, can make the open cut tunnel span bigger and bear heavier load.Simultaneously, can control the design thickness of tunnel lining effectively and carry out with imitating ground control Tunnel Lining Cracks, make the tunnel lining construction quality be easy to control.
With reference to Fig. 1, Fig. 2 and Fig. 3, as a kind of typical set-up mode, on the section of reinforced concrete lining layer structure 10, described prestressed member comprises the arc that is arranged at 11 inboards, arch to prestressed member 21, and is arranged at left side abutment wall 12, the left side vertical prestressing member 22 in right side abutment wall 14 outsides, right side vertical prestressing member 23 respectively.Arc adopts prestressed reinforcement or prestressed cable to prestressed member 21, left side vertical prestressing member 22, right side vertical prestressing member 23.With reference to Fig. 1 and Fig. 4, the ground tackle at its two ends, anchor head formation are arranged on the outer rim of reinforced concrete lining layer structure 10.
The diameter of phi of prestressed reinforcement or prestressed cable, strength grade f, spacing L and prestressed reinforcement or prestressed cable are determined according to the structural calculation needs apart from d apart from reinforced concrete lining layer structure 10 edges, the reverse bending moment that makes prestressed reinforcement or prestressed cable apply on the reinforced concrete lining layer structure 10 to produce is for producing 50%～60% of moment of flexure by backfill load and dead load, and wherein prestressed reinforcement or prestressed cable should be not less than 15cm apart from reinforced concrete lining layer structure 10 edges apart from d.
(headroom width 12.8m in the open cut tunnel) is example with certain V level II type two-wire open cut tunnel, adopts general open cut tunnel lining cutting, and arch thickness needs 1.8m, sidewall thickness 2m, linear meter(lin.m.) C35 concrete eight 8.85m
3, amount of reinforcement 11.1t.Adopt large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention, arch, sidewall thickness can be thinned to 1.3m, 1.4m respectively, linear meter(lin.m.) C35 steel concrete bricklaying 61.86m
3, amount of reinforcement 7.7t, linear meter(lin.m.) is saved about 3.3 ten thousand yuan of cost.Adopt large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention, if keep concrete lining thickness and total steel using amount (the muscle arrangement of reinforcement of being advocated is consistent) about the same, by calculating, the headroom width can reach 17.1m in the open cut tunnel.
Some principles of the above large span heavy load open cut tunnel prestressed reinforced concrete liner structure of the present invention that just explains through diagrams, be not be the present invention to be confined to shown in and in described concrete structure and the scope of application, so every corresponding modify and equivalent that might be utilized all belongs to the claim that the present invention applies for.
Claims (4)
1. large span heavy load open cut tunnel prestressed reinforced concrete liner structure, mould is built the reinforced concrete lining layer structure (10) that forms and is comprised arch (11), left side abutment wall (12), right side abutment wall (14) and inverted arch (13), it is characterized in that: along the open cut tunnel bearing of trend prestressed member is set at interval in the tensile region of described reinforced concrete lining layer structure (10), by prestressed member reinforced concrete lining layer structure (10) is applied prestressing force.
2. large span heavy load open cut tunnel prestressed reinforced concrete liner structure as claimed in claim 1, it is characterized in that: on the section of described reinforced concrete lining layer structure (10), described prestressed member comprises the arc that is arranged at inboard, arch (11) to prestressed member (21), and the left side vertical prestressing member (22), the right side vertical prestressing member (23) that are arranged at left side abutment wall (12), right side abutment wall (14) outside respectively.
3. large span heavy load open cut tunnel prestressed reinforced concrete liner structure as claimed in claim 1 is characterized in that: described arc is made of prestressed reinforcement or prestressed cable and the ground tackle, the anchor head that are arranged at its two ends to prestressed member (21), left side vertical prestressing member (22), right side vertical prestressing member (23).
4. large span heavy load open cut tunnel prestressed reinforced concrete liner structure as claimed in claim 1, it is characterized in that: described ground tackle, anchor head are arranged on the outer rim of reinforced concrete lining layer structure (10), and described prestressed reinforcement or prestressed cable are not less than 15cm apart from the distance (d) at reinforced concrete lining layer structure (10) edge.
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| CN201310106818.7A CN103195449B (en) | 2013-03-24 | 2013-03-24 | Large-span heavy-load open cut tunnel prestressed reinforced concrete liner structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545323A (en) * | 2015-12-07 | 2016-05-04 | 中交第二航务工程局有限公司 | Construction method for open cut tunnel lining |
| CN109339828A (en) * | 2018-11-29 | 2019-02-15 | 中南大学 | A kind of tunnel prestressing force inverted arch structure and its construction method |
| CN109973119A (en) * | 2019-04-02 | 2019-07-05 | 中交铁道设计研究总院有限公司 | A kind of design method of super-large span tunnel prestressed concrete liner structure |
| CN113202512A (en) * | 2021-06-04 | 2021-08-03 | 甘肃省交通规划勘察设计院股份有限公司 | Inverted arch construction method for split mounting type tunnel in weak surrounding rock section |
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2013
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545323A (en) * | 2015-12-07 | 2016-05-04 | 中交第二航务工程局有限公司 | Construction method for open cut tunnel lining |
| CN109339828A (en) * | 2018-11-29 | 2019-02-15 | 中南大学 | A kind of tunnel prestressing force inverted arch structure and its construction method |
| CN109339828B (en) * | 2018-11-29 | 2024-01-30 | 中南大学 | Tunnel prestress inverted arch structure and construction method thereof |
| CN109973119A (en) * | 2019-04-02 | 2019-07-05 | 中交铁道设计研究总院有限公司 | A kind of design method of super-large span tunnel prestressed concrete liner structure |
| CN109973119B (en) * | 2019-04-02 | 2020-07-31 | 中交铁道设计研究总院有限公司 | Design method of prestressed concrete lining structure of extra-large-span tunnel |
| CN113202512A (en) * | 2021-06-04 | 2021-08-03 | 甘肃省交通规划勘察设计院股份有限公司 | Inverted arch construction method for split mounting type tunnel in weak surrounding rock section |
| CN113202512B (en) * | 2021-06-04 | 2024-03-08 | 甘肃省交通规划勘察设计院股份有限公司 | Construction method for spliced tunnel inverted arch in weak surrounding rock section |
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