CN103953366A - Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches - Google Patents
Middle separation wall top original lining cavity backfilling construction method when single-hole tunnel is changed into multiple arches Download PDFInfo
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- CN103953366A CN103953366A CN201410213616.7A CN201410213616A CN103953366A CN 103953366 A CN103953366 A CN 103953366A CN 201410213616 A CN201410213616 A CN 201410213616A CN 103953366 A CN103953366 A CN 103953366A
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Abstract
The invention discloses a middle separation wall top original lining cavity backfilling construction method when a single-hole tunnel is changed into multiple arches. The method sequentially comprises the following steps that a, a middle separation wall is cast; b, an anterior hole is constructed; c, hole slag dug from the anterior hole is used for filling back a cavity arranged at one side of a posterior hole to the digging outline part of the posterior hole; d, a steel bar net is paved on the top of the backfilled hole slag, and then, concrete is sprayed on the surface of the steel bar net; e, an end template is arranged along a tunnel longitudinal frame, in addition, the end template, the surrounding rock and the original lining are fixedly built through lining by using anchor bolts; f, a side template is erected at the digging outline part of the anterior hole; g, concrete is filled and is compactly vibrated and smashed; h, the posterior hole is constructed; i, the original lining of the existing tunnel in the anterior hole and the posterior hole is dismounted. The construction method has the advantages that the original tunnel top cavity backfilling problem is effectively solved, so the pressure of the surrounding rock is uniformly transmitted onto a support protection structure, the stress uniformity and the structure completeness of the lining can be ensured, and the loading capability and the durability are improved.
Description
Technical field
The present invention relates to tunnel construction technology, related in particular to a kind of mid-board top former lining cutting cavity backfill construction method while changing arcading into for single hole tunnel.
Background technology
Along with the develop rapidly of Chinese national economy, the traffic volume increases day by day, original road, or even speedway can not adapt to the needs of communications and transportation.In developed area, the speedways such as large in Shen, wide Buddhist, Shanghai and Nanjing, the Beijing-Tianjin pool, capital pearl, Shanghai-Hangzhou, along with the continuous increase of the traffic volume, often there is serious traffic congestion phenomenon, affect the capacity and level-of-service of road, had to consider the origin road is carried out to reorganization and expansion to alleviate the traffic pressure being becoming tight day for this reason.In addition, in the abundant area of tourism resource, as areas such as Beijing, Hangzhou, Xi'an, Guilin, Suzhou, occurred equally the phenomenon that traffic congestion is on the rise, particularly festivals or holidays, jam more very, seriously restrict the demand of sound development and the comfortable trip of people in local tour market, for this reason, the reorganization and expansion of major urban arterial highway has all been carried out in many cities, to meet the transport need day by day increasing.As the tunnel of circuit throat, in reorganization and expansion process, certainly become controlled engineering, and multiple-arch tunnel have easy-to-connect, linear smoothness, saves the area, reduces and remove and reduce the advantages such as cost, is widely used.
But, due to the particularity of highway tunnel, the impact of various unfavorable factors in climate condition, orographic condition, geological conditions and design, construction, operation management, maintenance and reinforcement process, there is cavity miscellaneous in a lot of highway tunnel linings country rock behind, after causing highway tunnel to be built up, there is loaded down with trivial details changeable disease in various degree in tunnel structure, this has brought great potential safety hazard to highway tunnel normal transport.
Wherein highway tunnel lining back cavity disease is one of comparatively common disease, in serious threat tunnel driving safe, affect traffic operation.While there is cavity between support and wall rock, country rock can lose due supporting and relax, is out of shape, cause unstability, come off, when serious, can there is sudden avalanche, often make lining cutting be subject to inhomogeneous load, cause supporting and protection structure to produce flexural stress, and then the function of damage supporting and protection structure, reduce its supporting capacity, bring huge hidden danger to the general safety stability in tunnel, greatly affect the safe handling in tunnel.The punishment of tunnel lining back cavity can cause further damage to liner structure not in time, even making tunnel destroy accelerates, shorten maintenance period and the application life of highway tunnel, cause not reaching structure design of tunnel base period and be badly in need of overhaul, both wasted substantial contribution, affect again the normal use in tunnel, and cause bad social influence.Constructor has also designed some void handling methods, such as Chinese Patent Application No. is 2013101037831 to disclose a kind of tunnel vault cavity pumping backfill construction method, first the hoop edge of the steel arch frame of supporting along rear, forwards in weak surrounding rock, insert many steel pipes or anchor pole, later side's shaped steel arch is the strong point, between bow member and front country rock, form a leading freely supported structure of arch in the wings with steel pipe or anchor pole, and fix in advance at least 2 steel pipes as fill concrete pumping line at described freely supported structure middle part, then at described freely supported structure end face, lay one deck cover plate, and taking freely supported structure as skeleton, upwards spray one deck fast hardening concrete, top cavity is sealed, after closed concrete to be sprayed solidifies, fill concrete by from pumping line to freely supported structure end face pumping predetermined thickness.
Carry out in multiple-arch tunnel reconstruction and extension project at existing tunnel, mid-board is the core component of double-arched tunnel structure stress, stressed very complicated, be stress concentration portion position, tunnel (tensile, compressive, bending, turn round, shearing all has), the mechanical behavior of mid-board will be directly connected to the general stability of multiple-arch tunnel.As original tunnel of middle pilot tunnel, after mid-board is built, its original lining cutting back cavity is particularly outstanding on the impact of structure.Current Cavity treatment method is also inapplicable.Therefore, processing multiple-arch tunnel reconstruction and extension project Central Plains lining cutting back cavity is significant to the security maintenance in tunnel.
Summary of the invention
The construction method of the object of the present invention is to provide that a kind of construction sequence is feasible, the former lining cutting cavity in mid-board top carrying out backfill when tunnel safety is applicable to reliably single hole tunnel and changes arcading into after construction.Adopt the method to carry out after backfill grouting, can effectively solve former Tunnel head space hole backfill problem, make pressure from surrounding rock Transmit evenly on supporting and protection structure, ensure the complete of the stressed all even structures of lining cutting, improve supporting capacity and durability.
To achieve these goals, the present invention has adopted following technical scheme:
Mid-board top former lining cutting cavity backfill construction method when a kind of single hole tunnel changes arcading into, comprises the following steps successively:
A. at the lateral mid-point construction casting mid-board of existing tunnel;
B. after mid-board is built, hole in advance starts to construct;
C. wide open digging in process in advance, in the time finding that the former lining cutting in mid-board top occurs cavity behind, utilize from the hole slag that dig out in hole in advance the extremely excavation profile in rear row hole of the cavity backfill of rear row hole one side;
D. lay steel mesh reinforcement at slag top, the hole of backfill, then at steel mesh reinforcement jet surface concrete;
E. longitudinally set up Side Template one every 5～10m place along tunnel, and utilize crab-bolt that Side Template and country rock and former lining cutting are fixed together;
F. set up side template at the excavation profile place in hole in advance, and be reserved with grout hole on side template;
G. from reserved grout hole concrete perfusion from bottom to top, and vibration compacting;
H. row hole after construction;
I. remove the former lining cutting of the existing tunnel in hole Ji Houhang hole in advance.
Further illustrate as of the present invention, in steps d, the width of mesh of described steel mesh reinforcement is 10*10cm.Set up the steel mesh reinforcement of this width of mesh and can at utmost save steel, can ensure that again the concrete spraying can well combine with steel mesh reinforcement.
Further illustrate as of the present invention, in steps d, the concrete of injection adopts concrete more than C25, and the concrete thickness spraying is 10～15cm.Adopt concrete more than C25, can improve concrete compressive strength, guarantee the structural safety in construction and operation.
Further illustrate as of the present invention, in step e, the spacing of setting up of described Side Template is 5～10m.
Further illustrate as of the present invention, in step g, the concrete of perfusion adopts concrete more than C25, and at the full rear abundant vibration compacting of perfusion, until without cavity.Adopt concrete more than C25, can improve concrete compressive strength, guarantee the structural safety in construction and operation.And in step g, in concrete perfusion, vibrate by the vibrating spear that stretches into side template inside from grout hole, the concrete slurry that makes to be filled into side template inside is closely knit, the chamber of not leaving a blank.
Further illustrate as of the present invention, in the time that the cavity chinky altitude of the former lining cutting in mid-board top is less than 15cm, omit steps d, e.That is to say, in the time that cavity gap is smaller, can lay steel mesh reinforcement, directly set up side template, concrete perfusion.
Advantage of the present invention:
1. the present invention adopts hole slag rear row hole one side to be backfilled to the excavation profile place in rear row hole, can make original tunnel lining and country rock close contact, provides support, and prevents country rock excessive deformation in digging process, guarantees construction safety.
2. the present invention adopts hole slag rear row hole one side to be backfilled to the excavation profile place in rear row hole, can effectively utilize hole slag, greatly reduces grouting consumption, cost-saving.
3. the present invention adopts Spraying of reinforcement mat with concrete as side template, easy construction, and density is good, is difficult for spillage.
4. the present invention adopts Side Template that cavity is divided into multiple regions along the longitudinal, and spacing is 5～10m, and carrying out step by step, to be conducive to the vibration compacting that is in the milk.
The present invention at mid-board top original lining cutting concrete perfusion behind, and vibration compacting, can make mid-board wall body and original tunnel lining and country rock close contact, provide support, prevent country rock excessive deformation in excavation and even operation process, guarantee construction and operation security.
6. cavity backfill construction method of the present invention is respond well, efficiency of construction is higher, and operability is stronger, can meet the aspect requirements such as the project implementation is safe, economic, quick, high-quality.
7. mid-board of the present invention top former lining cutting cavity backfill construction method can be applied to other field, comprises solution cavity, underground river etc., has good economic benefit and application value.
Brief description of the drawings
Fig. 1 is the structural representation of existing tunnel.
Fig. 2 is the structural representation of one embodiment of the invention.
Fig. 3 is A-A generalized section in Fig. 2.
Fig. 4 is B-B generalized section in Fig. 2.
Reference numeral: 1-mid-board, the former lining cutting of 2-, 3-is hole in advance, row hole after 4-, 5-hole slag, 6-concrete, 7-steel mesh reinforcement, 8-Side Template, 9-grout hole.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described, but protection scope of the present invention is not only confined to the scope that following specific embodiment is recorded.
Embodiment 1:
Certain tunnel is to utilize the multiple-arch tunnel reconstruction and extension project of existing single-hole tunnel as middle pilot tunnel, tunnel total length 125m.In the time that right hole (hole in advance) is excavated near K0+530, find that original tunnel lining top comes to nothing.Cavity is larger, and hole top bit is not come to nothing height 30cm～2m not etc., extends transversely to the haunch of left side, and longitudinal extension length is not bright.Because tunnel span is larger, the about 34.3m of excavation overall with if do not carry out backfill processing, may cause larger sedimentation, even landslide during construction or operation.For this reason, adopted construction method of the present invention to complete smoothly the backfill of cavity.Pass through the result of site inspection and know, it is respond well that cavity is filled, and up to the present not yet occur obvious sedimentation, cracking, and original tunnel lining simultaneously and newly-built tunnel lining structure are intact.The method has reduced cost greatly, has also accelerated progress, has obtained significant economic benefit and social benefit.
Concrete construction method is as follows:
Mid-board top former lining cutting cavity backfill construction method when a kind of single hole tunnel changes arcading into, comprises the following steps successively:
A. at the lateral mid-point construction casting mid-board 1 of existing tunnel;
B. after mid-board 1 is built, hole 3 in advance starts to construct;
C. in hole 3 digging processs in advance, in the time finding that the former lining cutting 2 in mid-board top occurs cavity behind, utilize from the hole slag that dig out in hole 3 in advance the extremely excavation profile in rear row hole 4 of the cavity backfill of rear row hole 4 one sides;
D. lay the steel mesh reinforcement 7 that width of mesh is 10*10cm, the C25 concrete that is then 10cm at steel mesh reinforcement 7 jet surface thickness at the hole of backfill slag 5 tops;
E. longitudinally set up Side Template 8 one every 5m place along tunnel, and utilize crab-bolt that Side Template and country rock and former lining cutting are fixed together;
F. set up side template at the excavation profile place in hole 3 in advance, and on side template, be reserved with grout hole 9;
G. pour into from bottom to top C25 concrete from reserved grout hole 9, and at the full rear abundant vibration compacting of perfusion, until without cavity;
H. row hole 4 after construction;
I. remove the former lining cutting 2 of the existing tunnel in hole 3 and rear row hole 4 in advance.
Embodiment 2:
Certain tunnel is to utilize the multiple-arch tunnel reconstruction and extension project of existing single-hole tunnel as middle pilot tunnel, tunnel total length 130m.In the time that right hole (hole in advance) is excavated near K0+560, find that original tunnel lining top comes to nothing.Cavity is larger, and hole top bit is not come to nothing height 30cm～1m not etc., extends transversely to the haunch of left side, and longitudinal extension length is not bright.Adopt concrete construction method of the present invention as follows:
Mid-board top former lining cutting cavity backfill construction method when a kind of single hole tunnel changes arcading into, comprises the following steps successively:
A. at the lateral mid-point construction casting mid-board 1 of existing tunnel;
B. after mid-board 1 is built, hole 3 in advance starts to construct;
C. in hole 3 digging processs in advance, in the time finding that the former lining cutting 2 in mid-board top occurs cavity behind, utilize from the hole slag that dig out in hole 3 in advance the extremely excavation profile in rear row hole 4 of the cavity backfill of rear row hole 4 one sides;
D. lay the steel mesh reinforcement 7 that width of mesh is 10*10cm, the C25 concrete that is then 15cm at steel mesh reinforcement 7 jet surface thickness at the hole of backfill slag 5 tops;
E. longitudinally set up Side Template 8 one every 10m place along tunnel, and utilize crab-bolt that Side Template and country rock and former lining cutting are fixed together;
F. set up side template at the excavation profile place in hole 3 in advance, and on side template, be reserved with grout hole 9;
G. pour into from bottom to top C25 concrete from reserved grout hole 9, and at the full rear abundant vibration compacting of perfusion, until without cavity;
H. row hole 4 after construction;
I. remove the former lining cutting 2 of the existing tunnel in hole 3 and rear row hole 4 in advance.
Embodiment 3:
Certain tunnel is to utilize the multiple-arch tunnel reconstruction and extension project of existing single-hole tunnel as middle pilot tunnel, tunnel total length 150m.In the time that right hole (hole in advance) is excavated near K0+600, find that original tunnel lining top comes to nothing.Cavity is larger, and hole top bit is not come to nothing height 20cm～1.5m not etc., extends transversely to the haunch of left side, and longitudinal extension length is not bright.Adopt concrete construction method of the present invention as follows:
Mid-board top former lining cutting cavity backfill construction method when a kind of single hole tunnel changes arcading into, comprises the following steps successively:
A. at the lateral mid-point construction casting mid-board 1 of existing tunnel;
B. after mid-board 1 is built, hole 3 in advance starts to construct;
C. in hole 3 digging processs in advance, in the time finding that the former lining cutting 2 in mid-board top occurs cavity behind, utilize from the hole slag that dig out in hole 3 in advance the extremely excavation profile in rear row hole 4 of the cavity backfill of rear row hole 4 one sides;
D. lay the steel mesh reinforcement 7 that width of mesh is 10*10cm, the C25 concrete that is then 13cm at steel mesh reinforcement 7 jet surface thickness at the hole of backfill slag 5 tops;
E. longitudinally set up Side Template 8 one every 8m place along tunnel, and utilize crab-bolt that Side Template and country rock and former lining cutting are fixed together;
F. set up side template at the excavation profile place in hole 3 in advance, and on side template, be reserved with grout hole 9;
G. pour into from bottom to top C25 concrete from reserved grout hole 9, and at the full rear abundant vibration compacting of perfusion, until without cavity;
H. row hole 4 after construction;
I. remove the former lining cutting 2 of the existing tunnel in hole 3 and rear row hole 4 in advance.
Claims (5)
1. when single hole tunnel changes arcading into, the former lining cutting cavity backfill in a mid-board top construction method, is characterized in that, comprises the following steps successively:
A. at the lateral mid-point construction casting mid-board of existing tunnel;
B. after mid-board is built, hole in advance starts to construct;
C. wide open digging in process in advance, in the time finding that the former lining cutting in mid-board top occurs cavity behind, utilize from the hole slag that dig out in hole in advance the extremely excavation profile in rear row hole of the cavity backfill of rear row hole one side;
D. lay steel mesh reinforcement at slag top, the hole of backfill, then at steel mesh reinforcement jet surface concrete;
E. longitudinally set up Side Template one every 5～10m place along tunnel, and utilize crab-bolt that Side Template and country rock and former lining cutting are fixed together;
F. set up side template at the excavation profile place in hole in advance, and be reserved with grout hole on side template;
G. from reserved grout hole concrete perfusion from bottom to top, and vibration compacting;
H. row hole after construction;
I. remove the former lining cutting of the existing tunnel in hole Ji Houhang hole in advance.
2. when single hole tunnel according to claim 1 changes arcading into, the former lining cutting cavity backfill in mid-board top construction method, is characterized in that, in steps d, the width of mesh of described steel mesh reinforcement is 10*10cm.
3. when single hole tunnel according to claim 1 changes arcading into, the former lining cutting cavity backfill in mid-board top construction method, is characterized in that, in steps d, the concrete of injection adopts concrete more than C25, and the concrete thickness spraying is 10～15cm.
4. the former lining cutting cavity backfill in mid-board top construction method when single hole tunnel according to claim 1 changes arcading into, it is characterized in that, in step g, the concrete of perfusion adopts concrete more than C25, and at the full rear abundant vibration compacting of perfusion, until without cavity.
5. the former lining cutting cavity backfill in mid-board top construction method when single hole tunnel according to claim 1 changes arcading into, is characterized in that: in the time that the cavity chinky altitude of the former lining cutting in mid-board top is less than 15cm, omit steps d, e.
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| CN105257301A (en) * | 2015-10-16 | 2016-01-20 | 中铁十局集团济南铁路工程有限公司 | Method for reinforcing collapse of weak surrounding rock of shallow embedded and mining tunnel |
| CN105673046A (en) * | 2016-01-20 | 2016-06-15 | 中国葛洲坝集团第一工程有限公司 | Twin-arch tunnel middle pilot tunnel vault backfilling construction method |
| CN107165168A (en) * | 2017-07-13 | 2017-09-15 | 中国电建集团华东勘测设计研究院有限公司 | Full closure underground chamber backfill, consolidation grouting pipeline layout |
| CN108166989A (en) * | 2018-01-31 | 2018-06-15 | 中铁二十局集团轨道交通工程有限公司 | The asymmetric twin-arch tunnel interval wall construction method of water rich strata " OC " shape |
| CN109630137A (en) * | 2019-01-31 | 2019-04-16 | 中铁十四局集团建筑工程有限公司 | An a kind of tunnel high position passes through the backfill processing construction method of huge molten chamber |
| CN113250705A (en) * | 2021-06-28 | 2021-08-13 | 重庆工程职业技术学院 | Multi-arch tunnel construction method |
| CN113738387A (en) * | 2021-07-22 | 2021-12-03 | 清华大学 | Method and device for in-situ utilization of TBM stone slag in underground cave |
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| CN105257301A (en) * | 2015-10-16 | 2016-01-20 | 中铁十局集团济南铁路工程有限公司 | Method for reinforcing collapse of weak surrounding rock of shallow embedded and mining tunnel |
| CN105257301B (en) * | 2015-10-16 | 2017-11-03 | 中铁十局集团第一工程有限公司 | A kind of shallow-depth-excavation tunnel weak surrounding rock landslide reinforcing and processing method |
| CN105673046A (en) * | 2016-01-20 | 2016-06-15 | 中国葛洲坝集团第一工程有限公司 | Twin-arch tunnel middle pilot tunnel vault backfilling construction method |
| CN105673046B (en) * | 2016-01-20 | 2018-05-01 | 中国葛洲坝集团第一工程有限公司 | Double-arched tunnel middle drift vault backfills construction method |
| CN107165168A (en) * | 2017-07-13 | 2017-09-15 | 中国电建集团华东勘测设计研究院有限公司 | Full closure underground chamber backfill, consolidation grouting pipeline layout |
| CN108166989A (en) * | 2018-01-31 | 2018-06-15 | 中铁二十局集团轨道交通工程有限公司 | The asymmetric twin-arch tunnel interval wall construction method of water rich strata " OC " shape |
| CN109630137A (en) * | 2019-01-31 | 2019-04-16 | 中铁十四局集团建筑工程有限公司 | An a kind of tunnel high position passes through the backfill processing construction method of huge molten chamber |
| CN109630137B (en) * | 2019-01-31 | 2019-10-01 | 中铁十四局集团建筑工程有限公司 | An a kind of tunnel high position passes through the backfill processing construction method of huge molten chamber |
| CN113250705A (en) * | 2021-06-28 | 2021-08-13 | 重庆工程职业技术学院 | Multi-arch tunnel construction method |
| CN113250705B (en) * | 2021-06-28 | 2023-10-20 | 重庆工程职业技术学院 | Multi-arch tunnel construction method |
| CN113738387A (en) * | 2021-07-22 | 2021-12-03 | 清华大学 | Method and device for in-situ utilization of TBM stone slag in underground cave |
| CN113738387B (en) * | 2021-07-22 | 2022-12-06 | 清华大学 | Method and device for in-situ utilization of TBM stone slag in underground cave |
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