CN109577998B - Construction method for backfilling and station-crossing of piston air duct in shield interval - Google Patents
Construction method for backfilling and station-crossing of piston air duct in shield interval Download PDFInfo
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- CN109577998B CN109577998B CN201811472909.1A CN201811472909A CN109577998B CN 109577998 B CN109577998 B CN 109577998B CN 201811472909 A CN201811472909 A CN 201811472909A CN 109577998 B CN109577998 B CN 109577998B
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 239000002689 soil Substances 0.000 claims abstract description 40
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000004904 shortening Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of subway construction, in particular to a construction method for backfilling and passing through a station of a piston air duct in a shield interval.A piston air duct in the shield interval is internally provided with a steel support, backfilled with modified soil, a reinforced concrete plugging plate and backfilled soil to an underground water line in the annular direction outside a shield range after a bottom plate of the piston air duct in the interval is constructed, so that the rigidity of an inner support of the piston air duct is increased, the pressure of water and soil inside and outside a pit is balanced, and the stability of a foundation pit enclosure structure is ensured; when the shield passes through, synchronous grouting is enhanced, secondary grouting is carried out on the outer 6 rings of the tunnel portal, grouting is carried out on the water seepage part of the enclosure structure again when backfill soil is excavated, and the seam of the enclosure structure, the tunnel portal and the enclosure structure is sealed, so that the later construction safety is ensured. The invention effectively solves the contradiction between the construction period shortage of the shield and the construction lag of the piston air duct, and avoids the risk of starting and receiving the shield for multiple times when passing through the piston air duct; and has the advantages of reasonable process, safety and reliability, avoiding shield halt, effectively shortening construction period and the like.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a construction method for backfilling a piston air duct in a shield interval and passing a station.
Background
Along with the rapid development of the urban reduction in China, the urban rail transit construction strength is continuously increased. Urban subway construction is influenced by many factors such as pipeline removal, traffic guidance, land acquisition, removal, haze treatment and the like, so that the construction period of the subway is short. The shield machine needs to receive and start for multiple times in a short distance when the piston air duct in the shield region passes the station, the construction operation risk is large, the end reinforcing space is limited, the reinforcing period is long, the risk is brought to the construction safety, and the field construction requirement is difficult to meet by adopting the traditional method.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a construction method for backfilling a piston air duct in a shield interval and passing through a station, and solves the problems that the construction period of a node cannot be met and end reinforcement cannot be carried out when a piston air duct shield passes through the station due to the fact that the construction period is short and shield passing is carried out after a piston air duct main body is constructed.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a construction method for backfilling and station-crossing of a piston air duct in a shield interval comprises the following steps:
s1, constructing a piston air duct bottom plate waterproof and reinforced concrete;
s2, constructing a left and right line shield machine concrete guide platform;
s3, measuring and lofting the shield passing range and the newly added steel support position;
s4, expanding the shield range outwards by 3m, backfilling plastic improved soil in a layered mode, backfilling the rest parts with general soil, removing a fifth steel support in the shield range to the bottom of a third steel support, erecting a sixth steel support and applying a pre-applied axial force, backfilling and compacting in a layered mode step by step until the top of the second steel support is 1m, constructing a C20 reinforced concrete plugging plate with the thickness of 20cm, and continuously backfilling in a layered mode to the position of an underground water level line; meanwhile, the steel pipe for the dewatering well in the pit is led out to be above the backfill soil, so that normal dewatering is ensured;
s5, the left and right line shield machines pass through the piston air duct in sequence, the thrust of the shield machine is not more than 1000t when the piston air duct passes through, and the shield range enclosure structure is ground at a low speed; synchronous grouting is carried out, secondary radial grouting is enhanced, and the duct piece and the water flowing channel of the enclosure structure are plugged;
s6, excavating backfill soil and breaking the reinforced concrete blocking plate after the shield passes through the tunnel, excavating to a second steel support top by 1m, manually cleaning earthwork around the steel support, and avoiding the influence of machinery and earthwork on the original steel support in the excavating process; excavating to the bottom of the fifth steel support to remove the fifth steel support; when the excavation is carried out, the grouting and plugging are carried out in time when the water leakage phenomenon of the joints of the enclosure structure and the joints of the duct pieces and the enclosure structure is found, and the backfilling and back pressure are carried out when necessary;
s7, after the backfill soil excavation is finished, removing the inner pipe sheet of the piston air duct; firstly, a ring of pipe piece in the middle is broken, and the crane is matched with the pipe piece to sequentially remove the pipe piece from two ends.
And S8, sequentially constructing main structures such as the piston air duct side wall, the middle plate, the negative layer side wall and the top plate.
Furthermore, a concrete guide table of the shield machine is arranged on the bottom plate before the backfilling soil, so that the phenomenon of head falling when the shield machine passes through is prevented.
Furthermore, the backfill soil within 3m outside the range of the piston air duct portal is 10% of cement soil, the piston air duct portal is compacted in a layering mode during backfilling, the compaction degree is not less than 85%, and the other parts are backfilled with common plain soil.
Furthermore, the dewatering well in the pit is guided to the top of the backfilled soil by adopting a steel pipe in the backfilling process, so that the dewatering in the pit can be carried out normally, and the stability of the structure in the pit is ensured.
Furthermore, when the fifth steel support is dismantled, backfilling is needed to fill the bottom of the fifth steel support.
Furthermore, the newly-added sixth steel supports are erected when backfill is backfilled to the bottoms of the corresponding sixth steel supports, pre-axial force is applied to the newly-added sixth steel supports, the pre-axial force of each steel support is not greater than 300KN, and the situation that the pre-axial force is too large, uneven deformation is generated on the enclosure structure, and the stress of an original support system is influenced is prevented.
Further, the reinforced concrete plugging plate is arranged when the backfilling soil reaches the range of 1m of the second steel supporting roof; the thickness of the reinforced concrete plugging plate is 20cm, the reinforcing steel bars adopt 10mm HPB300 single-layer reinforcing steel bars, and the grid size is 25cm multiplied by 25 cm; the blocking plate is arranged to enable the shield to form a closed space through the area, and the synchronous grouting and secondary grouting quality can be effectively guaranteed.
Furthermore, the shield passing range of the piston air duct enclosure structure is all made of glass fiber ribs; when the shield machine passes through, the thrust is not larger than 1000t, the piston air duct enclosure structure is ground at a low speed, and the phenomenon that large blocks influence the soil discharging of the shield machine is avoided.
Furthermore, secondary grouting needs to be strengthened in the range of 6 ring duct pieces outside the portal pit after the shield passes through, and grouting quality of a joint between the portal and the duct pieces is ensured.
Furthermore, in the backfill excavation process, manual excavation is adopted within a range of 1m near the steel support, disturbance to the steel support is reduced to the maximum extent, grouting and water plugging are timely carried out if a water leakage phenomenon of the foundation pit support structure is found in the excavation process, and backfill back pressure is carried out if necessary.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a construction method for backfilling and passing through a station of a piston air duct in a shield interval, which is characterized in that steel supports in a shield range are dismantled from backfilled soil to the bottom of the steel supports, 5 steel supports are uniformly arranged on the periphery of 50cm outside the range of a piston air duct portal, an original support system is reserved to the maximum extent, all glass fiber reinforcements are arranged in the shield passage range, the safety of a shield piston air duct enclosure structure is effectively guaranteed, and the guarantee is provided for later-stage piston air duct main body construction; the reinforced concrete plugging plate is arranged in the backfill soil, so that a closed space is provided for shield tunneling, synchronous grouting and secondary grouting, the construction quality of the secondary grouting can be improved, and the joint of the tunnel portal and the segment is grouted again in the excavation process, so that the plugging quality of the intersection of the enclosure structure and the segment is ensured, and the later construction risk can be effectively reduced; the piston air duct is internally backfilled with soil to a water level line, so that the soil pressure balance inside and outside the pit can be ensured, the construction of end reinforcement, a precipitation well outside the pit and a water stop device at a tunnel portal can be avoided, the construction cost is reduced, the construction period is shortened, and the risk of repeated receiving and starting of the shield is avoided.
Drawings
FIG. 1 is a process diagram of the construction of the present invention;
FIG. 2 is a plan view of the piston duct and shield tunnel of the present invention;
in the figure: 1-piston air duct enclosure structure, 2-first horizontal support, 3-second steel support, 4-third steel support, 5-crown beam, 6-bottom plate, 7-shield machine concrete guide table, 8-in-pit dewatering well, 9-fourth steel support, 10-fifth steel support, 11-sixth steel support and 12-reinforced concrete plugging plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, a construction method for backfilling a piston air duct in a shield area to pass through a station comprises the following steps:
s1, constructing the piston air duct bottom plate 6 to be waterproof and reinforced concrete;
s2, constructing a left and right shield tunneling machine concrete guide table 7;
s3, measuring and lofting the shield passing range and the newly added steel support position;
s4, expanding the shield range outwards by 3m, backfilling plastic improved soil in a layered mode, backfilling the rest parts with general soil, removing a fifth steel support 10 in the shield range to the bottom of a third steel support, erecting a sixth steel support 11, applying a pre-applied axial force, backfilling and compacting in a layered mode step by step until the top of the second steel support is 1m, constructing a C20 reinforced concrete plugging plate 12 with the thickness of 20cm, and continuously backfilling in a layered mode until the position of an underground water level line; meanwhile, the dewatering well 8 in the pit is led out to be above the backfill soil through a steel pipe, so that normal dewatering is ensured;
s5, the left and right line shield machines pass through the piston air duct in sequence, the thrust of the shield machine is not more than 1000t when the piston air duct passes through, and the shield range enclosure structure is ground at a low speed; synchronous grouting is carried out, secondary radial grouting is enhanced, and the duct piece and the water flowing channel of the enclosure structure are plugged;
s6, excavating backfill soil after the shield passes through, breaking the reinforced concrete blocking plate 12, excavating to 1m from the top of the second steel support 3, manually cleaning earthwork around the steel support 3, and avoiding the influence of machinery and earthwork on the original steel support in the excavating process; excavating to the bottom of the fifth steel support 10 to remove the fifth steel support 10; when the excavation is carried out, the grouting and plugging are carried out in time when the water leakage phenomenon of the joints of the enclosure structure and the joints of the duct pieces and the enclosure structure is found, and the backfilling and back pressure are carried out when necessary;
s7, after the backfill soil excavation is finished, removing the inner pipe sheet of the piston air duct; firstly, a ring of pipe piece in the middle is broken, and the crane is matched with the pipe piece to sequentially remove the pipe piece from two ends.
And S8, sequentially constructing main structures such as the piston air duct side wall, the middle plate, the negative layer side wall and the top plate.
Furthermore, a concrete guide table of the shield machine is arranged on the bottom plate 6 before backfilling, so that the phenomenon of head falling when the shield machine passes through is prevented.
Furthermore, the backfill soil within 3m outside the range of the piston air duct portal is 10% of cement soil, the piston air duct portal is compacted in a layering mode during backfilling, the compaction degree is not less than 85%, and the other parts are backfilled with common plain soil.
Furthermore, the dewatering well 8 in the pit is guided to the top of the backfilled soil by adopting a steel pipe in the backfilling process, so that the normal operation of dewatering in the pit is ensured, and the stability of the structure in the pit is ensured.
Further, the fifth steel support 10 is dismantled by backfilling the bottom of the fifth steel support 10.
Furthermore, the newly-added sixth steel supports 11 are erected when backfill is backfilled to the bottoms of the corresponding sixth steel supports 11, pre-axial force is applied to the newly-added sixth steel supports 11, the pre-axial force of each steel support is not greater than 300KN, and the situation that the building envelope is unevenly deformed due to the fact that the pre-axial force is too large, and the stress of an original support system is affected is prevented.
Further, the reinforced concrete plugging plate 12 is arranged when the backfilling soil reaches the range of 1m from the top of the second steel support 3; the reinforced concrete plugging plate is 12 cm thick and 20cm, the reinforcing steel bars adopt 10mm HPB300 single-layer reinforcing steel bars, and the grid size is 25cm multiplied by 25 cm; the blocking plate 12 is arranged to enable the shield to pass through the area to form a closed space, and the synchronous grouting and secondary grouting quality can be effectively guaranteed.
Furthermore, the shield passing range of the piston air duct enclosure structure 1 is all made of glass fiber ribs; when the shield machine passes through, the thrust is not larger than 1000t, the piston air duct enclosure structure is ground at a low speed, and the phenomenon that large blocks influence the soil discharging of the shield machine is avoided.
Furthermore, secondary grouting needs to be strengthened in the range of 6 ring duct pieces outside the portal pit after the shield passes through, and grouting quality of a joint between the portal and the duct pieces is ensured.
Furthermore, in the backfill excavation process, manual excavation is adopted within a range of 1m near the steel support, disturbance to the steel support is reduced to the maximum extent, grouting and water plugging are timely carried out if a water leakage phenomenon of the foundation pit support structure is found in the excavation process, and backfill back pressure is carried out if necessary.
The piston air duct enclosure structure horizontal support system comprises a first horizontal support 2 and a crown beam 5, the piston air duct enclosure structure is further provided with a fourth steel support 9, and the fourth steel support 9 and the fifth steel support 10 are at the same horizontal height.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. A construction method for backfilling and station-crossing of a piston air duct in a shield interval is characterized by comprising the following steps:
s1, constructing a piston air duct bottom plate (6) to be waterproof and reinforced concrete;
s2, constructing a left and right line shield machine concrete guide table (7);
s3, measuring and lofting the shield passing range and the newly added steel support position;
s4, expanding the shield range outwards by 3m, backfilling plastic improved soil in a layered mode, backfilling the rest parts with general soil, removing a fifth steel support (10) in the shield range to the bottom of a third steel support, erecting a sixth steel support (11) and applying a pre-applied axial force, backfilling and compacting in a layered mode step by step to the top 1m of a second steel support, constructing a C20 reinforced concrete blocking plate (12) with the thickness of 20cm, and continuously backfilling in a layered mode to the position of an underground water level line; meanwhile, a dewatering well (8) in the pit is led out to the position above the backfill soil through a steel pipe, so that normal dewatering is ensured;
s5, the left and right line shield machines pass through the piston air duct in sequence, the thrust of the shield machine is not more than 1000t when the piston air duct passes through, and the shield range enclosure structure is ground at a low speed; synchronous grouting is carried out, secondary radial grouting is enhanced, and the duct piece and the water flowing channel of the enclosure structure are plugged;
s6, excavating backfill soil after the shield passes through the shield, breaking the reinforced concrete blocking plate (12), excavating to the top 1m of the second steel support (3), manually cleaning earthwork around the second steel support (3), and avoiding the influence of machinery and earthwork on the original steel support in the excavating process; excavating to the bottom of the fifth steel support (10) to dismantle the fifth steel support (10); when the excavation is carried out, the grouting and plugging are carried out in time when the water leakage phenomenon of the joints of the enclosure structure and the joints of the duct pieces and the enclosure structure is found, and the backfilling and back pressure are carried out when necessary;
s7, after the backfill soil excavation is finished, removing the inner pipe sheet of the piston air duct; firstly, a ring of duct pieces in the middle are broken, and a crane is matched to sequentially remove duct pieces from two ends;
and S8, constructing the main structures of the piston air duct side wall, the middle plate, the negative layer side wall and the top plate in sequence.
2. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and a shield machine concrete guide table is arranged on the construction piston air duct bottom plate (6).
3. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: the backfill soil within 3m outside the range of the piston air duct portal is 10% of cement soil, is compacted in a layering mode during backfilling, the compaction degree is not less than 85%, and the other parts are backfilled with common plain soil.
4. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and the dewatering well (8) in the pit is guided to the top of the backfilled soil by adopting a steel pipe in the backfilling process.
5. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and when the fifth steel support (10) is dismantled, backfilling is needed to fill the bottom of the fifth steel support (10).
6. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and erecting the newly added sixth steel supports (11) when backfilling the backfill to the bottoms of the corresponding sixth steel supports (11), and applying a pre-applied axial force to the newly added sixth steel supports (11), wherein the pre-applied axial force of each steel support is not more than 300 KN.
7. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: the reinforced concrete plugging plate (12) is arranged within the range of 1m from the backfilling to the top of the second steel support (3); the reinforced concrete plugging plate (12) is 20cm thick, the reinforcing steel bars adopt 10mm HPB300 single-layer reinforcing steel bars, and the grid size is 25cm multiplied by 25 cm; and arranging a blocking plate (12) to enable the shield passing area to form a closed space.
8. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: the shield passing ranges all adopt glass fiber ribs; when the shield machine passes through, the thrust is not more than 1000t, and the piston air duct enclosure structure is ground at a low speed.
9. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and after the shield passes through the tunnel portal, secondary grouting needs to be strengthened in the range of 6 ring pipe pieces outside the tunnel portal.
10. The construction method for backfilling and station-crossing of the piston air duct in the shield interval according to claim 1, characterized by comprising the following steps: and in the backfill excavation process, manual excavation is adopted within a range of 1m near the steel support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811472909.1A CN109577998B (en) | 2018-12-04 | 2018-12-04 | Construction method for backfilling and station-crossing of piston air duct in shield interval |
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| CN201811472909.1A CN109577998B (en) | 2018-12-04 | 2018-12-04 | Construction method for backfilling and station-crossing of piston air duct in shield interval |
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| CN109577998B true CN109577998B (en) | 2020-10-09 |
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| CN110499779B (en) * | 2019-08-15 | 2024-03-26 | 中铁十一局集团城市轨道工程有限公司 | Construction method of air duct structure sharing side wall with subway station |
| CN112253149A (en) * | 2020-11-02 | 2021-01-22 | 北京市政建设集团有限责任公司 | Reinforcing method for shield tunneling machine to translate through reserved hole section of subway station middle plate |
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| CN108756903A (en) * | 2018-06-01 | 2018-11-06 | 中铁二局集团有限公司 | A kind of shield machine crosses the construction method of well |
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2018
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| CN102146679A (en) * | 2010-02-09 | 2011-08-10 | 中铁十一局集团有限公司 | Construction method for complex geological section earth pressure balance shield passing middle air shaft |
| CN103046933A (en) * | 2012-12-08 | 2013-04-17 | 中铁十二局集团有限公司 | Shield station-crossing tunneling and station parallel construction method |
| CN104912561A (en) * | 2015-05-28 | 2015-09-16 | 中建一局集团第五建筑有限公司 | Construction method of shield continuous shaft crossing under high-pressure-bearing water complicated stratum condition |
| CN105003272A (en) * | 2015-07-26 | 2015-10-28 | 北京工业大学 | Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways |
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| CN108756903A (en) * | 2018-06-01 | 2018-11-06 | 中铁二局集团有限公司 | A kind of shield machine crosses the construction method of well |
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| CN109577998A (en) | 2019-04-05 |
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