CN101725358A - Excavation construction method of ultra-shallow buried uneven weathered stratum of tunnel - Google Patents
Excavation construction method of ultra-shallow buried uneven weathered stratum of tunnel Download PDFInfo
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Abstract
The invention relates to an excavation construction method of an ultra-shallow buried uneven weathered stratum of a tunnel. A segmented step method is used for construction, and a tunnel section is divided into a left side of an upper station, a right side of the upper station, a middle station and a lower station; each segment of step is sequentially constructed circularly, one-time excavation length of each segment of step is not larger than 30m preferably, and a middle partition wall is changed into a straight wall from the traditional curved wall at the left side of the upper station. Thus, for the uneven weathered stratum in the shallow buried area of wall rocks, the dynamic construction method using the segmented step method has little process interference, reduces the construction cost, has simple operation, safety, reliability, less temporary support, low fund investment and high construction speed, is suitable for large machinery for construction, and ensures that the whole construction process is in a safe, stable, high-quality and high-speed controllable state.
Description
Technical field:
The present invention relates to a kind of tunnel excavation job practices, refer to a kind of excavation construction method that is applicable to ultra-shallow buried uneven weathered stratum of tunnel especially.
Background technology:
The tunnel excavation job practices is commonly used double side wall pilot tunnel method, median septum method, the median septum method etc. of intersecting.The median septum method is mainly used in double track tunnel IV level country rock buried hard rock location and location, strong yellow soil tunnel (IV level country rock).The median septum method of intersecting is mainly used in the buried soft rock of IV level country rock, shallow embedding, bias voltage location and the buried location of V level country rock.Thereby these two kinds of job practicess all can't be applied to V level country rock shallow embedding location.Though the double side wall pilot tunnel method is mainly used in the shallow embedding of V level country rock, bias voltage and hole section, it is the base tunnel of first tunneling both sides, and carries out preliminary bracing, again the method for partial excavation remainder.When edpth of tunnel 6-21 rice only, and the stratum in country rock shallow embedding location is mainly mud stone, during the uneven weathered stratum of argillaceous sandstone and chiltern mud stone, because the geology of this section is bad: uneven weathered red beds solution cavity and crack cavern water, karst are comparatively grown, the many fillings of solution cavity, solution cavity scale are 1.0-5.2 rice; Add uneven weathered trough valley and easily cause the unstability of caving in, underground water infiltration etc.; Thereby, exist edpth of tunnel shallow, the construction geology condition is poor, and security risk is big, the duration problem of big pressure.And tunnel portal is in the deep foundation ditch, adopts double side wall base tunnel rule to advance very difficulty of hole.
Summary of the invention:
Technical problem to be solved by this invention is: at above-mentioned the deficiencies in the prior art, providing a kind of is applicable to shallow buried uneven weathered stratum and advances the ultra-shallow buried uneven weathered stratum of tunnel excavation construction method that excavates in the hole from the arch, it is simple to operate, safe and reliable, and suitable big machinery is constructed.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of ultra-shallow buried uneven weathered stratum of tunnel excavation construction method, it adopts the construction of branch benching tunnelling method, at first tunnel cross-section is divided into four parts: the left side of appearing on the stage, the right side of appearing on the stage, Zhong Tai, and leave from office; Concrete construction sequence is as follows:
1), arch advance support: utilize the upright steelframe of a last circulation frame to apply advance support;
2), excavate the left side 2 of appearing on the stage:
Excavate the left side 2 of appearing on the stage, excavation ring width 0.5-1m causes surface subsidence for reducing tunnel deformation, and ensures construction safety, carry out the preliminary bracing and the mid-board temporary lining of barrel structure, promptly just spray the thick concrete of 4cm, the upright tunnel of frame steelframe, (comprising the interim steelframe of base tunnel), and lock foot anchoring stock is set, multiple pneumatically placed concrete is to design thickness after being drilled with radially anchor pole, and the bottom steelframe is just setting up behind the pneumatically placed concrete, sets up the back pneumatically placed concrete sealing again that finishes; And mid-board changed into stalk by former bent wall, like this, more convenient, quick when other worker's methods CRD, CD and the conversion of three steps.
3), excavate the right side of appearing on the stage:
The excavation right side of appearing on the stage, the right side of the appearing on the stage left side 5-10m that appears on the stage that lags behind, excavation ring width 0.5-1m, the interim steelframe of mid-board part has been constructed and has been finished, and applies preliminary bracing, and interim inverted arch is set up according to the base plate geological condition.Length of bench is not more than 10m.
Adopt the hand excavation to reserve core soil when appearing on the stage, all adopt artificial muck removal to soil property.
4), platform in the excavation:
Top bar construction to suitable distance back (generally being not more than 10m), platform in the excavation, about the excavation that staggers, apply preliminary bracing, i.e. the first thick concrete of spray 4cm, frame founds steelframe, is drilled with behind the system anchor bolt again pneumatically placed concrete to design thickness.Length of bench is about 10m.
5), excavation is left office:
Excavation is left office, sealing preliminary bracing Cheng Huan, and inverted arch in time follows up, and fills at the bottom of the placing tunnel, utilizes the disposable placing secondary lining of lining shuttering chassis, and the arch wall lining cutting once applies.
In the construction, the construction that circulates successively of each step, each step once excavates length should not be greater than 30m, and strengthens construction monitoring and instruct site operation, measures frequency every day 1-2 time.The working procedure and the execution conditions of above-mentioned preliminary bracing and temporary lining are same as the prior art.
So, uneven weathered stratum in country rock shallow embedding location, adopt Dynamic Construction worker's method of above-mentioned branch benching tunnelling method, operation is disturbed few, has reduced construction costs, and this job practices is simple to operate, safe and reliable, suitable big machinery is constructed, and temporary lining is few, drop into economic lacking, speed of application is fast; Guaranteed that construction overall process is in safety, stable, high-quality, controllable state fast.
Description of drawings:
Fig. 1 is a working procedure of the present invention cross section schematic diagram.
Fig. 2 is a working procedure vertical section schematic diagram of the present invention.
The specific embodiment:
Referring to Figure 1 and Figure 2, for the present invention in shallow buried uneven weathered stratum, the ultra-shallow buried uneven weathered stratum of tunnel excavation construction method that excavates in the hole is advanced in employing from the arch, it adopts the construction of branch benching tunnelling method, at first tunnel cross-section is divided into four parts: the left side 1 of appearing on the stage, the right side 2 of appearing on the stage, middle platform 3, and leave office 4; Concrete construction sequence is as follows:
1), arch advance support 5 (leading pre-reinforcing of φ 108 pipe canopies):
Take the leading 108 long tube canopies encrypted in the 140 ° of scopes in arch, tunnel, length 20-40m, circumferential distance 40cm, long tube canopy overlap joint 4-5m between every circulation.Be aided with φ 42 leading ductule 1.5m one rings that long 3.5m encrypts in the excavation.Leading long tube canopy level sets, and establishes the guiding wall, and level plugs the long tube canopy.
2), excavate the left side 1 of appearing on the stage:
Excavate the left side 1 of appearing on the stage, excavation ring width 0.5-1m, cause surface subsidence for reducing tunnel deformation, and guarantee construction safety, apply the preliminary bracing and mid-board 6 temporary linings of barrel structure, spraying concrete thickness is 35cm, and steelframe is I 25 i iron, interim inverted arch adopts I 22 i iron, sprays the thick 28cm of concrete; Mid-board 6 adopts I 22 i iron, sprays the thick 22cm of concrete.And lock foot anchoring stock is set, and promptly add φ 50 lock pin anchor tubes 7, add 4 under every Pin steelframe.Arch springing place excavation face amplifies, and adopts the spray of injection concrete full.
3), excavate the right side 2 of appearing on the stage:
Excavate the right side 2 of appearing on the stage, 5-10m on the left of the right side of appearing on the stage lags behind and appears on the stage, excavation length is not more than 10m, applies preliminary bracing, and interim inverted arch is set up according to the base plate geological condition.
Adopt the hand excavation to reserve core soil when appearing on the stage, all adopt artificial muck removal to soil property.
4), platform 3 in the excavation:
Platform in the excavation, excavation length is 10m, applies preliminary bracing.Middle platform can apply mid-board and interim inverted arch according to geological condition.
5), excavation leaves office 4:
Excavation is left office, sealing preliminary bracing Cheng Huan, and inverted arch in time follows up, and fills 8 at the bottom of the placing tunnel, utilizes the disposable placing secondary lining 9 of lining shuttering chassis, and the arch wall lining cutting once applies.The every 2-3m of inverted arch supporting constructs once, and inverted arch lining cutting 5m once.
In the construction, each step circulation construction, each step once excavates length should not be greater than 30m, and the reinforcement construction monitoring measures, surface subsidence, vault sink and horizontal clearance convergence 5m is provided with a section, measuring point is arranged on the same section in surface subsidence point and the hole, measurement frequency every day 1-2 time.
Claims (2)
1. ultra-shallow buried uneven weathered stratum of tunnel excavation construction method is characterized in that: adopt branch's benching tunnelling method construction, at first tunnel cross-section is divided into four parts: the left side of appearing on the stage, the right side of appearing on the stage, Zhong Tai, and leave from office; Concrete construction sequence is as follows:
1), arch advance support;
2), the excavation left side of appearing on the stage: excavation ring width 0.5-1m applies the preliminary bracing of barrel structure and is the temporary lining of the mid-board of stalk, and lock foot anchoring stock is set;
3), the excavation right side of appearing on the stage: the right side of the appearing on the stage left side 5-10m that appears on the stage that lags behind, excavation length is not more than 10m, applies preliminary bracing;
4), platform in the excavation: excavation length is not more than 10m, applies preliminary bracing;
5), excavation is left office: excavation length is 2-3m, seals preliminary bracing Cheng Huan, and inverted arch in time follows up, filling, secondary lining at the bottom of the placing tunnel;
In the construction, the construction that circulates successively of each step, each step once excavates length and is not more than 30m, and strengthens construction monitoring and measure.
2. ultra-shallow buried uneven weathered stratum of tunnel excavation construction method according to claim 1 is characterized in that: being set to of described lock foot anchoring stock adds lock pin anchor tube, adds 4 under every Pin steelframe.
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| CN200810143470A CN101725358A (en) | 2008-10-31 | 2008-10-31 | Excavation construction method of ultra-shallow buried uneven weathered stratum of tunnel |
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| CN200810143470A CN101725358A (en) | 2008-10-31 | 2008-10-31 | Excavation construction method of ultra-shallow buried uneven weathered stratum of tunnel |
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| CN102182469A (en) * | 2011-05-04 | 2011-09-14 | 中铁三局集团有限公司 | Construction method for preventing cracking of second lining of middle cavity of large span tunnel |
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| CN113914869B (en) * | 2021-10-21 | 2023-08-04 | 陕西路桥集团有限公司 | Semi-bright and semi-dark tunnel hole entering construction method under shallow buried bias voltage collapse condition |
| CN114233297A (en) * | 2021-12-09 | 2022-03-25 | 中建八局南方建设有限公司 | Excavation construction method for large-span small-clear-distance shallow-buried tunnel |
| CN114810091A (en) * | 2022-04-29 | 2022-07-29 | 中铁建华南建设有限公司 | Three-step normal CRD method direct conversion rapid construction method |
| CN114810091B (en) * | 2022-04-29 | 2022-12-27 | 中铁建华南建设有限公司 | Three-step normal CRD method direct conversion rapid construction method |
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Application publication date: 20100609 |