CN103982188A - Supporting structure system of rock stratum large-section deep vertical shaft and construction method of supporting structure system - Google Patents
Supporting structure system of rock stratum large-section deep vertical shaft and construction method of supporting structure system Download PDFInfo
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- CN103982188A CN103982188A CN201410241602.6A CN201410241602A CN103982188A CN 103982188 A CN103982188 A CN 103982188A CN 201410241602 A CN201410241602 A CN 201410241602A CN 103982188 A CN103982188 A CN 103982188A
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Abstract
The invention relates to a supporting structure system of a rock stratum large-section deep vertical shaft and a construction method of the supporting structure system. If the large-section deep vertical shaft is supported only through steel frame anchor and shotcrete supporting, stability or deformation of the side wall of the vertical shaft can hardly be effectively controlled. The supporting structure system comprises primary supporting shotcrete, wherein a primary supporting grid steel frame is preset in the primary supporting shotcrete. Multiple layers of transverse horizontal steel supports are arranged in the space, inside the primary supporting shotcrete, of the vertical shaft from top to bottom, wherein each steel frame comprises inclined steel braces located at the four corners and a straight steel brace located in the middle, the ends of the steel frames are all fixed to a steel surrounding purlin which is arranged on the inner wall of the primary supporting shotcrete in a surrounding mode, the periphery of the steel surrounding purlin is fixed to a primary supporting profile steel frame embedded in the primary supporting shotcrete, primary supporting anchor rods are welded to both the primary supporting grid steel frame and the primary supporting profile steel frame, and the other ends of the primary supporting anchor rods are hit into surrounding rock. According to the supporting structure system and the construction method, flexible supporting and rigid supporting are reasonably combined, a conventional supporting method is not changed, construction is convenient, investment is saved, and overall stability of a vertical shaft foundation pit is enhanced.
Description
Technical field
the invention belongs to tunnel construction technical field, be specifically related to supporting structure system and the construction method thereof of the large section deep shaft of a kind of rock quality layer.
Background technology
21 century is the period that underground construction develops rapidly, and the construction of China's subway engineering was like a raging fire especially especially in recent years.The extensive use of rock tunnel development machine in subway engineering has higher requirement to its working shaft size and the degree of depth; In addition, in the underground engineering construction in other field, large section deep shaft is also widely used.So large excavated section and cutting depth, is to consider supporting type or perform space enclosing structure by deep foundation ditch by general vertical shaft, is the difficult problem of pendulum before design surface; For general vertical shaft, at the most frequently used support pattern of rock quality layer, be exactly steelframe bolt-spary supports, but for the larger vertical shaft of section, as only adopted steelframe bolt-spary supports, it is all comparatively difficult to effective control of the stability of vertical shaft sidewall and distortion, and security risk is larger; As press deep foundation ditch and consider, adopt conventional " castinplace pile+inner support " supporting type, construction investment and construction speed are all had to considerable influence, cause very large engineering waste.
Summary of the invention
The supporting structure system and the construction method thereof that the object of this invention is to provide the large section deep shaft of a kind of rock quality layer, change conventional support pattern, is more suitable in compared with the operating mode of heavy excavation section and cutting depth.
The technical solution adopted in the present invention is:
The supporting structure system of the large section deep shaft of rock quality layer, is characterized in that:
First the sprayed mortar that includes vertical shaft wall, just props up in sprayed mortar and is preset with and just props up grid steel frame;
The steel that is just provided with multilayer transverse horizontal in the shaft space in a sprayed mortar from top to bottom supports, steel supports and to comprise and be positioned at that the oblique steel of four jiaos supports and the straight steel support at middle part, the end that tiltedly steel supports and straight steel supports is all fixed on and is arranged at the just steel of a sprayed mortar inwall ring week and encloses on purlin, and steel encloses purlin periphery and is fixed in first the profile steel frame being embedded in advance in a first sprayed mortar;
Just a grid steel frame and a first profile steel frame are all welded with a just anchor pole, just prop up the anchor pole other end and squeeze into country rock.
Between a described first grid steel frame, by connecting reinforcement, be weldingly connected, vertical spacing is 0.5-1m;
A described just profile steel frame is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame closing on up and down.
The vertical spacing that described steel supports is 3-6m, tiltedly steel support and straight steel support with steel enclose purlin be connected one end for being fixedly connected with, the other end is flexible connection.
It is 2 Pin simultaneous i iron that described steel encloses purlin, and upper end inner edge is fixed on a just sprayed mortar by oblique reinforcing pull rod, and lower end is fixed with angle steel A-frame, and outer ring is fixed with squeezes into the just short anchor pole of a sprayed mortar.
The construction method of the supporting structure system of the large section deep shaft of rock quality layer, is characterized in that:
By following steps, realized:
Step 1: vertical shaft well head is provided with conventional mould and builds steel reinforced concrete fore shaft circle, built and reached after design strength 70%, the steel that sets up first floor transverse horizontal supports, the oblique steel that comprises four bights supports and the straight steel at a middle part supports, and the end that tiltedly steel supports and straight steel supports is all connected in steel reinforced concrete fore shaft circle inner side;
Step 2: vertical shaft excavates downwards, at the first pneumatically placed concrete lay steel mesh reinforcement of vertical shaft wall; The vertical just grid steel frame of frame, between by connecting reinforcement, be weldingly connected, vertical spacing is 0.5-1m; Just, prop up the vertical just profile steel frame of frame between grid steel frame, just propping up profile steel frame is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame closing on up and down, and vertical spacing is 3-6m; Just propping up grid steel frame and just prop up the first anchor pole of welding in profile steel frame, just prop up the anchor pole other end and squeeze into country rock; Multiple pneumatically placed concrete to preliminary bracing is 350mm; Excavation and supporting cyclic advance are 1m.
The present invention has the following advantages:
The present invention is on the basis of vertical shaft steelframe bolt-spary supports, and setting can apply prestressed steel support system, and the plane that can support steel according to the power of the size of shaft section area and strata pressure is laid and vertical spacing adjusts; According to the feature of supporting type, the connected node enclosing between purlin and first propping up is optimized simultaneously, to realize the good combination of rigid support and flexible support, does not change conventional support pattern, not only convenient construction operation, goes back cost saving; Be provided with and can apply prestressed steel support system, not only can effectively control the distortion of vertical shaft sidewall and ground settlement, also strengthened the resistance to overturning of vertical shaft foundation ditch, thereby reduce engineering risk.
After formed product of the present invention, just form vertical shaft temporary support structures, can meet the slag tap requirement of the correlation functions such as charging of construction period, as need perform vertical shaft permanent structure, can tear piecemeal from bottom to top support, form concrete two linings open, met its normal instructions for use.So just solved the contradiction of the supporting and protection structure pattern type selecting that steelframe bolt-spary supports pattern has a big risk, castinplace pile+inner support supporting type cost long in time limit is high, its railway, highway, Hydraulic Tunnel, urban subway tunnel, etc. construction field all have a wide range of applications.
Accompanying drawing explanation
Fig. 1 is shaft support structure cross section (plane) schematic diagram.
Fig. 2 is shaft support structural profile (facade) schematic diagram.
Fig. 3 is that steel encloses purlin and just props up and be connected drawing with vertical shaft.
In figure, 1-just props up anchor pole, and 2-just props up sprayed mortar, and 3-just props up grid steel frame, and 4-just props up profile steel frame, and the straight steel of 5-supports, and the oblique steel of 6-supports, and 7-steel encloses purlin, the oblique reinforcing pull rod of 8-, 9-angle steel A-frame, the short anchor pole of 10-.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention will be described in detail.
The large section deep shaft of rock quality layer involved in the present invention involved in the present invention, section excavation size (17.3x11.3) m, excavation area reaches 195.5m
2, cutting depth reaches 39.6m; So large excavated section and cutting depth, is to consider supporting type or perform space enclosing structure by deep foundation ditch by general vertical shaft, is the difficult problem of pendulum before design surface; For general vertical shaft, at the most frequently used support pattern of rock quality layer, be exactly steelframe bolt-spary supports, but for the larger vertical shaft of section, as only adopted steelframe bolt-spary supports, it is all comparatively difficult to effective control of the stability of vertical shaft sidewall and distortion, and security risk is larger; As press deep foundation ditch and consider, adopt conventional castinplace pile+inner support supporting type, construction investment and construction speed are all had to considerable influence, can cause very large engineering waste.Based on above situation, on the basis of general vertical shaft steelframe bolt-spary supports, setting can apply prestressed steel support system, and the plane that can support steel according to the power of the size of shaft section area and strata pressure is laid and vertical spacing adjusts; According to the feature of supporting type, the connected node enclosing between purlin and first propping up is optimized simultaneously, to realize the good combination of rigid support and flexible support, guarantees globality and the validity of whole supporting structure system simultaneously.
The supporting structure system of the large section deep shaft of rock quality layer involved in the present invention, includes preliminary bracing system and steel support system.Preliminary bracing system includes a first sprayed mortar 2, just props up grid steel frame 3, just props up profile steel frame 4 and just prop up anchor pole 1.Steel support system is that the steel of transverse horizontal supports, and comprises that oblique steel support 6, straight steel support 5 and steel enclose purlin 7.
Concrete structure is: include first sprayed mortar 2 of vertical shaft wall, just prop up in sprayed mortar 2 and be preset with and just prop up grid steel frame 3.The steel that is just provided with multilayer transverse horizontal in the shaft space in a sprayed mortar 2 from top to bottom supports, steel support comprise be positioned at the oblique steel of four jiaos support 6 and the straight steel at middle part support 5, tiltedly steel support 6 and straight steel support 5 end and be all fixed on and be arranged at the just steel of sprayed mortar 2 inwall ring week and enclose on purlin 7, steel encloses purlin 5 and the interior profile laminating of preliminary bracing, and be closed into ring, steel encloses purlin 7 peripheries and is fixed in first the profile steel frame 4 being embedded in advance in a first sprayed mortar 2, certain prestressing is done for preliminary bracing, guarantee the monolithic stability in large section vertical shaft foundation pit construction stage.Just a grid steel frame 3 and a first profile steel frame 4 are all welded with a just anchor pole 1, just prop up anchor pole 1 other end and squeeze into country rock.Just a grid steel frame 3, just prop up profile steel frame 4 and just prop up after anchor pole 1 is just propped up sprayed mortar 2 parcels and form certain thickness flexible preliminary bracing structure, keep inherent strength and the self-supporting ability of country rock, the distortion of jointly resisting country rock.
Wherein, just prop up between grid steel frame 3 and be weldingly connected by connecting reinforcement, vertical spacing is 0.5-1m; Just a profile steel frame 4 is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame 3 closing on up and down; The vertical spacing that steel supports is 3-6m, tiltedly steel support 6 and straight steel support 5 with steel enclose purlin 7 be connected one end for being fixedly connected with, the other end is flexible connection.Steel supports should determine vertical spacing in conjunction with shaft section area size and strata pressure; Shield structure well excavated section is generally all at 100m
2above, need to consider four jiaos at vertical shaft oblique steel support 6 is set, tiltedly steel supports the isosceles triangle that 6 both sides adjacent with vertical shaft form 45 ° of angles, effectively reduces the span of vertical shaft preliminary bracing, improves its stress condition; As longer in long limit, can according to circumstances on long limit, increase straight steel and support 5, two end supports is in the long limit of vertical shaft; As larger in shaft section area, length limit all needs to set up straight steel and supports 5, can lay 1,3,5 by vertical interval ... road supports the straight steel support 5 of four jiaos of oblique steel supports 6 and long limit is only set, 2,4,6 ... four jiaos of oblique steel supports 6 are only set in road support and the straight steel support 5 of minor face avoids intersection to disturb, and suitably reduces to support vertical spacing.
It is 2 Pin simultaneous i iron that steel encloses purlin 7, and upper end inner edge is fixed on a just sprayed mortar 2 by oblique reinforcing pull rod 8, and lower end is fixed with angle steel A-frame 9, and spacing 3m, between the upper and lower every laying; Consider that the first Zhi Houdu of vertical shaft and rigidity are little, for further guaranteeing that steel encloses the firm of purlin 7, outer ring is fixed with squeezes into the just short anchor pole 10 of a sprayed mortar 2 simultaneously, and upper and lower both sides are pressed spacing 3m interval and laid.
Concrete construction method is as follows:
Step 1: vertical shaft well head is provided with conventional mould and builds steel reinforced concrete fore shaft circle, built and reached after design strength 70%, the steel that sets up first floor transverse horizontal supports, the oblique steel that comprises four bights supports the straight steel support 5 at 6 and middle parts, and tiltedly steel supports 6 and is all connected in steel reinforced concrete fore shaft circle inner side with the end of straight steel support 5;
Step 2: vertical shaft excavates downwards, at the first pneumatically placed concrete lay φ 8150x150 steel mesh reinforcement of vertical shaft wall; Vertical 4 φ 25 of frame are a grid steel frame 3 just, between by connecting reinforcement, be weldingly connected, vertical spacing is 0.5-1m; Between a first grid steel frame 3, the vertical work 25b of frame just props up profile steel frame 4, and just propping up profile steel frame 4 is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame 3 closing on up and down, and vertical spacing is 3-6m; In a first grid steel frame 3 and a first profile steel frame 4, weld φ 25 hollow slip castings and just prop up anchor pole 1, just prop up anchor pole 1 other end and squeeze into country rock; Multiple pneumatically placed concrete to preliminary bracing is 350mm; Excavation and supporting cyclic advance are 1m.
Steel supports and generally selects the φ 609 steel pipe inner supporting systems that foundation pit supporting project is conventional, so that draw materials and reuse.In shaft excavation process, mutually combining of the systemic circulation of setting up by partial circulating and the steel support of preliminary bracing, safety shaft is excavated to after design elevation, formed vertical shaft temporary support structures, can meet the slag tap requirement of the correlation functions such as charging of construction period, as need perform vertical shaft permanent structure, can tear piecemeal from bottom to top support, form concrete two linings open, meet its normal instructions for use.
The supporting structure system of the large section deep shaft of this rock quality layer solved the distortion of steelframe bolt-spary supports pattern wayward, have a big risk and the contradiction of the supporting and protection structure type selecting that castinplace pile+inner support supporting type is long in time limit, cost is high, flexible support and rigid support are reasonably combined: do not change conventional steelframe bolt-spary supports mode, not only convenient construction operation, goes back cost saving; Be provided with and can apply prestressed steel support system, not only can effectively control the distortion of vertical shaft sidewall and ground settlement, also strengthened the resistance to overturning of vertical shaft foundation ditch, thereby reduce engineering risk.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading manual of the present invention, is claim of the present invention and contains.
Claims (5)
1. the supporting structure system of the large section deep shaft of rock quality layer, is characterized in that:
First the sprayed mortar (2) that includes vertical shaft wall, just props up in sprayed mortar (2) and is preset with and just props up grid steel frame (3);
The steel that is just provided with multilayer transverse horizontal in the shaft space in a sprayed mortar (2) from top to bottom supports, steel supports and to comprise and be positioned at the straight steel support (5) that the oblique steel of four jiaos supports (6) and middle part, the end that tiltedly steel supports (6) and straight steel supports (5) is all fixed on ring and is arranged at just the steel of sprayed mortar (2) inwall week to enclose purlin (7) upper, and steel encloses purlin (7) periphery and is fixed on and is embedded in advance in interior first the profile steel frame (4) of a first sprayed mortar (2);
Just a grid steel frame (3) and a first profile steel frame (4) are all welded with a just anchor pole (1), just prop up anchor pole (1) other end and squeeze into country rock.
2. the supporting structure system of the large section deep shaft of rock quality layer according to claim 1, is characterized in that:
Between a described first grid steel frame (3), by connecting reinforcement, be weldingly connected, vertical spacing is 0.5-1m;
A described just profile steel frame (4) is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame (3) closing on up and down.
3. the supporting structure system of the large section deep shaft of rock quality layer according to claim 2, is characterized in that:
The vertical spacing that described steel supports is 3-6m, tiltedly steel support (6) and straight steel support (5) and steel enclose purlin (7) be connected one end for being fixedly connected with, the other end is flexible connection.
4. the supporting structure system of the large section deep shaft of rock quality layer according to claim 3, is characterized in that:
It is 2 Pin simultaneous i iron that described steel encloses purlin (7), and upper end inner edge is fixed on a just sprayed mortar (2) by oblique reinforcing pull rod (8), and lower end is fixed with angle steel A-frame (9), and outer ring is fixed with squeezes into the just short anchor pole (10) of a sprayed mortar (2).
5. the construction method of the supporting structure system of the large section deep shaft of rock quality layer, is characterized in that:
By following steps, realized:
Step 1: vertical shaft well head is provided with conventional mould and builds steel reinforced concrete fore shaft circle, built and reached after design strength 70%, the steel that sets up first floor transverse horizontal supports, the straight steel that the oblique steel that comprises four bights supports (6) and a middle part supports (5), and the end that tiltedly steel supports (6) and straight steel supports (5) is all connected in steel reinforced concrete fore shaft circle inner side;
Step 2: vertical shaft excavates downwards, at the first pneumatically placed concrete lay steel mesh reinforcement of vertical shaft wall; The vertical just grid steel frame (3) of frame, between by connecting reinforcement, be weldingly connected, vertical spacing is 0.5-1m; Just, prop up the vertical just profile steel frame (4) of frame between grid steel frame (3), just propping up profile steel frame (4) is 3 Pin simultaneous i iron, and by connecting reinforcement, is weldingly connected between first the grid steel frame (3) closing on up and down, and vertical spacing is 3-6m; In a just grid steel frame (3) and the upper welding of a first profile steel frame (4), just prop up anchor pole (1), just prop up anchor pole (1) other end and squeeze into country rock; Multiple pneumatically placed concrete to preliminary bracing is 350mm; Excavation and supporting cyclic advance are 1m.
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| CN105201514A (en) * | 2015-09-15 | 2015-12-30 | 中国矿业大学 | Water-bearing rock stratum borehole wall structure and construction method |
| CN106050239A (en) * | 2016-06-14 | 2016-10-26 | 中铁十二局集团有限公司 | Construction method for retaining structure of deep and large vertical shaft in water-abundant upper-soft lower-hard stratum |
| CN108978709A (en) * | 2018-07-20 | 2018-12-11 | 中铁十六局集团地铁工程有限公司 | City integrated piping lane branch construction method under a kind of space-constrained environments |
| CN109826654A (en) * | 2019-03-12 | 2019-05-31 | 四川省交通运输厅公路规划勘察设计研究院 | Tunnel ventilation well supporting construction and its construction method |
| CN110306563A (en) * | 2019-07-22 | 2019-10-08 | 中铁第一勘察设计院集团有限公司 | Steel purlin fall arrest conversion equipment |
| CN110671114A (en) * | 2019-11-01 | 2020-01-10 | 中国地质大学（北京） | Recovery type circular shaft supporting device and method |
| CN111075452A (en) * | 2019-12-23 | 2020-04-28 | 重庆市轨道交通设计研究院有限责任公司 | Geotechnical mixed vertical shaft engineering supporting system and vertical shaft construction method |
| CN111156002A (en) * | 2020-01-19 | 2020-05-15 | 北京市市政工程设计研究总院有限公司 | Construction vertical shaft arranged at four-way joint at bottom above underground excavation station and construction method |
| CN113090272A (en) * | 2021-04-26 | 2021-07-09 | 中国恩菲工程技术有限公司 | Deep shaft and partition supporting method thereof |
| CN114215524A (en) * | 2021-12-16 | 2022-03-22 | 哈尔滨工业大学 | Corrugated steel shotcrete shaft is strutted |
| CN114526076A (en) * | 2022-01-25 | 2022-05-24 | 中铁二十局集团南方工程有限公司 | Construction method for hoisting shield machine out of hoisted vertical shaft |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
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| CN105201514A (en) * | 2015-09-15 | 2015-12-30 | 中国矿业大学 | Water-bearing rock stratum borehole wall structure and construction method |
| CN106050239A (en) * | 2016-06-14 | 2016-10-26 | 中铁十二局集团有限公司 | Construction method for retaining structure of deep and large vertical shaft in water-abundant upper-soft lower-hard stratum |
| CN106050239B (en) * | 2016-06-14 | 2018-06-15 | 中铁十二局集团有限公司 | The deep pozo construction method of enclosure structure of strong rich water upper-soft lower-hard ground |
| CN108978709A (en) * | 2018-07-20 | 2018-12-11 | 中铁十六局集团地铁工程有限公司 | City integrated piping lane branch construction method under a kind of space-constrained environments |
| CN108978709B (en) * | 2018-07-20 | 2020-09-04 | 中铁十六局集团地铁工程有限公司 | Urban comprehensive pipe gallery branch construction method in space-limited environment |
| CN109826654A (en) * | 2019-03-12 | 2019-05-31 | 四川省交通运输厅公路规划勘察设计研究院 | Tunnel ventilation well supporting construction and its construction method |
| CN110306563A (en) * | 2019-07-22 | 2019-10-08 | 中铁第一勘察设计院集团有限公司 | Steel purlin fall arrest conversion equipment |
| CN110671114B (en) * | 2019-11-01 | 2024-05-03 | 中国地质大学（北京） | Recovery type round vertical shaft supporting device and method |
| CN110671114A (en) * | 2019-11-01 | 2020-01-10 | 中国地质大学（北京） | Recovery type circular shaft supporting device and method |
| CN111075452A (en) * | 2019-12-23 | 2020-04-28 | 重庆市轨道交通设计研究院有限责任公司 | Geotechnical mixed vertical shaft engineering supporting system and vertical shaft construction method |
| CN111156002A (en) * | 2020-01-19 | 2020-05-15 | 北京市市政工程设计研究总院有限公司 | Construction vertical shaft arranged at four-way joint at bottom above underground excavation station and construction method |
| CN113090272A (en) * | 2021-04-26 | 2021-07-09 | 中国恩菲工程技术有限公司 | Deep shaft and partition supporting method thereof |
| CN114215524A (en) * | 2021-12-16 | 2022-03-22 | 哈尔滨工业大学 | Corrugated steel shotcrete shaft is strutted |
| CN114215524B (en) * | 2021-12-16 | 2024-02-20 | 哈尔滨工业大学 | Corrugated steel shotcrete shaft support |
| CN114526076A (en) * | 2022-01-25 | 2022-05-24 | 中铁二十局集团南方工程有限公司 | Construction method for hoisting shield machine out of hoisted vertical shaft |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
| CN115492126B (en) * | 2022-10-26 | 2024-07-05 | 中国电建集团西北勘测设计研究院有限公司 | Foundation pit supporting structure and method for combining steel sheet piles and vertical shafts |
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