CN108978709B - Urban comprehensive pipe gallery branch construction method in space-limited environment - Google Patents
Urban comprehensive pipe gallery branch construction method in space-limited environment Download PDFInfo
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- CN108978709B CN108978709B CN201810799720.7A CN201810799720A CN108978709B CN 108978709 B CN108978709 B CN 108978709B CN 201810799720 A CN201810799720 A CN 201810799720A CN 108978709 B CN108978709 B CN 108978709B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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Abstract
The invention discloses a method for constructing branches of an urban comprehensive pipe gallery in a space-limited environment, which comprises the following steps: reasonably dividing the construction system into a horizontal construction unit and a vertical construction unit, and marking a branch excavation range by using red paint spraying and timber piles on site; adopting an inverted well wall construction to carry out the construction of the horizontal unit and the vertical unit; road or landscape restoration can be carried out on the top of the horizontal structure unit, and the earthwork of the horizontal unit is transferred to the vertical unit for outward transportation through the unearthed passage reserved on the middle partition wall; and carrying out horizontal unit backfill and vertical unit superstructure construction, wherein each 3m is a construction section, and the vertical unit superstructure is directly subjected to waterproof construction on the wall of the vertical shaft well and internally provided with a counter-support bracket system. The invention can immediately recover urban traffic and landscape requirements, avoids adverse effects of large machinery on the environment, is convenient for protecting underground pipelines, skillfully integrates and excavates the horizontal construction unit and the vertical construction unit, and respectively carries out structural construction, thereby reducing the construction period, the construction cost and the risk.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a branch construction method of an urban comprehensive pipe gallery in a space-limited environment.
Background
Due to the functional requirements of the comprehensive pipe rack, the comprehensive pipe rack is provided with dense outlet branches. The main line of the comprehensive pipe gallery can be constructed under urban roads by adopting an underground excavation method, a shield method and the like, and the access users are usually existing buildings (structures) which are put into use, so that the outgoing line branches of the access users are limited by sites, and the problem of construction in urban areas is particularly prominent. If the open cut foundation pit mode is adopted, the following defects exist: (1) the original municipal pipelines are dense, and the construction of the enclosing row piles conflicts with the complex underground pipelines, so that the original pipelines need to be changed or protected, and the larger protection cost and the construction period restriction are caused; (2) the construction site area requirement is large, and the influence on urban traffic is obvious; (3) the influence on the environment is large, such as sludge generated in pile foundation construction, noise generated in large-scale mechanical construction and the like. The undercut method has the following disadvantages: (1) the underground excavation engineering quantity is small, and the cost is obviously improved; (2) the construction period is long, and the construction has adverse effect on the environment. (3) The outlet structure has a large slope and high construction risk.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a branch construction method of an urban comprehensive pipe gallery in a space-limited environment, which can overcome the defects in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a city comprehensive pipe gallery branch construction method under a space limited environment comprises the following steps:
s1: reasonably dividing the branch structure into a horizontal construction unit and a vertical construction unit according to the characteristics of the branch structure form, accurately positioning by using a measuring instrument through site reconnaissance, and marking a branch excavation range by using red paint and a timber pile on site;
s2: adopt the construction of the wall of a well of hanging upside down to carry out the construction of horizontal construction unit and vertical construction unit bottommost layer structure, specifically include:
s2.1: the construction method comprises the following steps that a small excavator is matched with a manual construction pneumatic pick section by section from top to bottom, 1 construction cycle is excavated more for a vertical construction unit than for a horizontal construction unit, and a horizontal construction unit and a vertical construction unit earth carrying channel are reserved through a middle partition wall;
s2.2: when the horizontal construction unit is finished to 3m, carrying out top section steel opposite support construction;
s2.3: the construction of the steel temporary bridge at the top of the horizontal construction unit is carried out according to the requirement of the surrounding environment, and if no traffic requirement exists, the landscape bridge can be recovered;
s2.4: the excavation and grid supporting operation are repeated until the vertical shaft is sealed, and the construction of the inverted well wall is completed;
s3: carry out horizontal construction unit backfill and vertical construction unit superstructure construction, every 3m is a construction segmentation, directly carries out waterproof construction at the shaft wall of a well, need not carry out outside founding the mould, and inside adoption is to propping a support system.
Further, in step S2.1, the central area is excavated first and then diagonal excavation is performed around, and the depth of each layer is the same as the distance between the grids.
Further, in step S2.4, after the vertical shaft is excavated every time with a space between two grids, concrete is sprayed for the first time by 40mm, a steel bar grid and a steel bar net piece are installed, and after the concrete is reported, managed and accepted, the concrete is sprayed for the final time.
Furthermore, the primary spraying concrete and the final spraying concrete both adopt wet spraying processes.
Furthermore, in step S2.4, a side wall conduit with a diameter of 42mm is arranged for each roof truss of the well wall in the excavation process, and grouting is performed to reinforce the stratum.
Further, the circumferential spacing of the side wall ducts is 2.0m, the length is 2.5m, and the inclination angle is 40 degrees.
Further, the grouting slurry is cement slurry or cement and water glass double-liquid slurry according to geological conditions, and the grouting pressure is 0.2-0.5 MPa.
Further, in the step S2.1, the middle partition wall in the range of the two-lining structure adopts the encrypted vertical connecting ribs, the inner layer and the outer layer are arranged, concrete is not sprayed in the structural height range, and the section steel cross brace is convenient to detach when the horizontal construction unit structure is constructed.
Furthermore, the section steel cross brace and the well wall grating are connected through bolts, and the bolts are high-strength bolts.
The invention has the beneficial effects that: the invention can immediately recover urban traffic and landscape requirements, avoids adverse effects of large machinery on the environment by adopting manual excavation, is convenient for protecting underground pipelines, skillfully integrates and excavates the horizontal construction unit and the vertical construction unit, and respectively carries out structural construction, thereby reducing the construction period, the construction cost and the risk.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a sectional view of a plot outgoing line branch shaft according to an embodiment of the present invention;
fig. 2 is a plot line-out branch shaft plan;
FIG. 3 is a schematic view of a plot branching structure;
FIG. 4 is a schematic view of a horizontal structural unit and a vertical structural unit construction section;
FIG. 5 is a schematic view of the structure of the landscape restoration section;
FIG. 6 is a schematic view of the construction of the lattice support section;
FIG. 7 is a schematic structural view of the bottom-most structure construction of the horizontal structural units and the vertical structural units;
FIG. 8 is a schematic structural view of horizontal structural unit backfilling and vertical structural unit superstructure construction;
in the figure: 1. a structural outline; 2. plain concrete; 3. a horizontal construction unit; 4. a vertical construction unit; 5. a landscape bridge.
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 that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1 to 8, the method for branch construction of an urban comprehensive pipe gallery in a space-limited environment according to the embodiment of the present invention includes the following steps:
s1: reasonably dividing the branch structure into a horizontal construction unit and a vertical construction unit according to the characteristics of the branch structure form, accurately positioning by using a measuring instrument through site reconnaissance, and marking a branch excavation range by using red paint and a timber pile on site;
s2: adopt the construction of the wall of a well of hanging upside down to carry out the construction of horizontal construction unit and vertical construction unit bottommost layer structure, specifically include:
s2.1: the construction method comprises the following steps that a small excavator is matched with a manual construction pneumatic pick section by section from top to bottom, 1 construction cycle is excavated more for a vertical construction unit than for a horizontal construction unit, and a horizontal construction unit and a vertical construction unit earth carrying channel are reserved through a middle partition wall;
s2.2: when the horizontal construction unit is finished to 3m, carrying out top section steel opposite support construction;
s2.3: the construction of the steel temporary bridge at the top of the horizontal construction unit is carried out according to the requirement of the surrounding environment, and if no traffic requirement exists, the landscape bridge can be recovered;
s2.4: the excavation and grid supporting operation are repeated until the vertical shaft is sealed, and the construction of the inverted well wall is completed;
s3: carry out horizontal construction unit backfill and vertical construction unit superstructure construction, every 3m is a construction segmentation, directly carries out waterproof construction at the shaft wall of a well, need not carry out outside founding the mould, and inside adoption is to propping a support system.
In a specific embodiment, in step S2.1, the central area is excavated first and then the diagonal surrounding excavation is performed, and the depth of each layer is the same as the distance between the grids.
In a specific embodiment, in step S2.4, after a grid spacing is excavated in each time by the shaft, concrete is sprayed for the first time by 40mm, a steel bar grid and a steel bar net are installed, and after the concrete is reported, managed and accepted, concrete is sprayed for the final time.
In a specific embodiment, the primary spray concrete and the final spray concrete both use wet spray processes.
In a specific embodiment, in step S2.4, a side wall conduit with a diameter of 42mm is arranged for each roof truss of the well wall in the excavation process, and grouting is performed to reinforce the stratum.
In one embodiment, the sidewall conduits are circumferentially spaced 2.0m apart, 2.5m in length, and angled 40 °.
In a specific embodiment, the grouting slurry is cement slurry or cement and water glass double-fluid slurry according to geological conditions, and the grouting pressure is 0.2-0.5 MPa.
In a specific embodiment, in the step S2.1, the middle partition wall in the range of the two-lining structure adopts the encrypted vertical connecting ribs, the inner and outer layers are arranged, concrete is not sprayed in the structural height range, and the section steel cross brace is convenient to detach when the horizontal construction unit structure is constructed.
In a specific embodiment, the section steel cross brace is connected with the well wall grating by bolts, and the bolts are high-strength bolts.
In order to facilitate understanding of the above-described technical aspects of the present invention, the above-described technical aspects of the present invention will be described in detail below in terms of specific usage.
According to the urban comprehensive pipe gallery branch construction method in the environment with limited space, firstly: and the construction is carried out by adopting a small excavator matched with a manual construction pneumatic pick section by section from top to bottom. The vertical construction unit is excavated for 1 more construction cycle than the horizontal construction unit, the excavation and grid support operation are repeated, and the horizontal construction unit is excavated to the underground for 3 m; then, road or landscape restoration at the top of the horizontal construction unit can be carried out, the earthwork of the horizontal construction unit is transported to the vertical construction unit for outward transportation through an unearthed channel reserved on a middle partition wall, and the road or landscape restoration at the top of the horizontal construction unit can be carried out after 3 days of earthwork excavation at the fastest speed; the excavation and the grid supporting operation are repeated until the vertical shaft is capped to finish the construction of the inverted well wall; carrying out horizontal construction unit structure construction and vertical construction unit bottommost layer structure; carry out horizontal construction unit backfill and vertical construction unit superstructure construction, every 3m is a construction segmentation (according to design layering height determination), directly carries out waterproof construction at the shaft wall of a well, need not carry out outside founding the mould, and inside adopts props the support system, and the supplementary increase is thrown and is propped the overall stability that improves the support.
Before construction, according to a construction drawing and an actual detection situation on site, the branch excavation range is accurately positioned through a measuring instrument and then is marked by red paint spraying and timber piles on the site.
When the horizontal unit and the vertical unit are excavated, the construction of an inverted well wall is adopted, and a small excavator is matched with a manual construction pneumatic pick to carry out section by section from top to bottom. The vertical units are excavated for 1 construction cycle more than the horizontal units, the diagonal excavation is carried out around the central area, and the depth of each layer is the same as the distance between the grids. When the horizontal unit is completed to 3m, the top section steel is constructed for supporting, the horizontal unit and the vertical construction order earth carrying channel are reserved (the section steel is not erected temporarily, the supporting height is not more than 2 m), and the horizontal unit top steel temporary bridge construction can be carried out according to the needs of the surrounding environment (if no traffic needs exist, landscape restoration can be carried out). And (5) repeatedly excavating and supporting the grating until the bottom of the vertical shaft is sealed, and completing the construction of the inverted well wall.
After the space between two grids is excavated in each time, concrete is sprayed for 40mm in the first time, and after steel bar grids are installed and steel bar net pieces are reported, managed and accepted, concrete is sprayed for the last time. The sprayed concrete adopts a wet spraying process. In the excavation process, a ring of phi 42 side wall guide pipes are arranged for each truss of the well wall in a drilling mode, and grouting is conducted to reinforce the stratum. The circumferential interval @2.0m, the length 2.5m and the inclination angle 40 degrees. And (3) selecting cement paste or cement and water glass double-liquid paste according to geological conditions, determining the grouting mixing ratio according to field tests, and controlling the grouting pressure to be 0.2-0.5 MPa.
The middle partition wall in the range of the two-lining structure adopts the encrypted vertical connecting rib, the inner layer and the outer layer are arranged at @0.5m, concrete is not sprayed in the structural height range, and the section steel cross brace is convenient to detach when the horizontal unit structure construction is ensured. The section steel cross brace is connected with the well wall grating through bolts, and the bolts are high-strength bolts.
And (4) immediately carrying out structural construction after the horizontal unit is excavated, and carrying out backfill operation on the vertical shaft of the horizontal unit after the structure is finished. The bottom layer structure of the vertical construction unit and the unit structure of the horizontal structure are integrally poured, and the upper structure takes 3m as a construction section. The waterproof construction is directly carried out in the range of the shaft wall of the vertical shaft without carrying out outer side vertical formwork. The support system is supported in the inner part, and the overall stability of the support is improved by increasing the throwing support in an auxiliary mode.
In conclusion, the top traffic restoration (landscape restoration) can be carried out within 3 days after the earthwork excavation due to reasonable unit division, and the traffic influence (landscape influence) on the urban dense area is greatly reduced. The excavation circulation difference of the horizontal units and the vertical units is utilized, the excavation passage can be realized only through the vertical units, and after the horizontal units finish excavation for 3m and erect the top section steel cross braces, top traffic recovery (landscape recovery) can be carried out.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A city comprehensive pipe gallery branch construction method under a space limited environment is characterized by comprising the following steps:
s1: reasonably dividing the branch structure into a horizontal construction unit and a vertical construction unit according to the characteristics of the branch structure form, accurately positioning by using a measuring instrument through site reconnaissance, and marking a branch excavation range by using red paint and a timber pile on site;
s2: adopt the construction of the wall of a well of hanging upside down to carry out horizontal construction unit and vertical construction unit construction, specifically include:
s2.1: the construction method comprises the following steps that a small excavator is matched with a manual construction pneumatic pick section by section from top to bottom, 1 construction cycle is excavated more for a vertical construction unit than for a horizontal construction unit, and a horizontal construction unit earth carrying channel is reserved through a middle partition wall;
s2.2: when the horizontal construction unit is finished to 3m, carrying out top section steel opposite support construction;
s2.3: constructing a steel temporary bridge at the top of the horizontal construction unit according to the requirement of the surrounding environment, and if no traffic requirement exists, recovering the landscape bridge;
s2.4: the excavation and grid supporting operation are repeated until the vertical shaft is sealed, and the construction of the inverted well wall is completed;
s3: carry out horizontal construction unit backfill and vertical construction unit superstructure construction, every 3m is a construction segmentation, directly carries out waterproof construction at the shaft wall of a well, need not carry out outside founding the mould, and inside adoption is to propping a support system.
2. The method for branch construction of the urban comprehensive pipe gallery in the space-limited environment according to claim 1, wherein in the step S2.1, the central area is excavated first and then the diagonal excavation is performed around, and the depth of each layer is the same as the distance between the gratings.
3. The method for constructing branches of an urban comprehensive pipe gallery in a space-limited environment according to claim 1, wherein in step S2.4, after a space between two grids is excavated in each time by the vertical shaft, concrete is sprayed for the first time by 40mm, a steel bar grid and a steel bar net piece are installed, and after the concrete is reported, managed and accepted, the concrete is sprayed for the last time.
4. The method for branch construction of the urban comprehensive pipe gallery in the space-limited environment according to claim 3, wherein the primary spray concrete and the final spray concrete are both wet-sprayed.
5. The method for branch construction of the urban comprehensive pipe gallery in the environment with limited space according to claim 1, wherein in the step S2.4, a side wall guide pipe with the diameter of 42mm is arranged on each grid of the well wall in the excavation process for grouting and reinforcing the stratum.
6. The urban comprehensive pipe gallery branch construction method in the space-constrained environment according to claim 5, wherein the circumferential spacing of the side wall guide pipes is 2.0m, the length is 2.5m, and the inclination angle is 40 °.
7. The urban comprehensive pipe gallery branch construction method under the space-limited environment according to claim 5, characterized in that grouting slurry is selected from cement paste or cement and water glass double-liquid slurry according to geological conditions, and the grouting pressure is 0.2-0.5 MPa.
8. The urban comprehensive pipe gallery branch construction method under the environment with limited space according to claim 1, wherein in the step S2.1, the middle partition wall in the range of the two-lining structure adopts the encrypted vertical connecting rib, the inner layer and the outer layer are arranged, concrete is not sprayed in the structural height range, and the section steel cross brace is convenient to detach when the horizontal construction unit structure construction is carried out.
9. The urban comprehensive pipe gallery branch construction method under the space-limited environment according to claim 8, wherein the profile steel cross braces are connected with the well wall grating through bolts, and the bolts are high-strength bolts.
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| CN112459120A (en) * | 2020-11-16 | 2021-03-09 | 北京正坤市政工程有限责任公司 | Road pipeline shaft construction equipment |
| CN115125999A (en) * | 2022-07-29 | 2022-09-30 | 国家电网有限公司 | Method for shortening construction time of electric vertical shaft of filled earth stratum |
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| JPH07150899A (en) * | 1993-11-30 | 1995-06-13 | Daiho Constr Co Ltd | Method for constructing underground large space structure, and the structure |
| CN103452561A (en) * | 2013-08-20 | 2013-12-18 | 中铁二局股份有限公司 | Vertical in-tunnel construction method of multilayer transverse channel of underground excavation station of metro, and construction method on east side and west side |
| CN103982188A (en) * | 2014-06-03 | 2014-08-13 | 中铁第一勘察设计院集团有限公司 | Supporting structure system of rock stratum large-section deep vertical shaft and construction method of supporting structure system |
| CN106150506A (en) * | 2016-07-08 | 2016-11-23 | 中铁十六局集团地铁工程有限公司 | A kind of gateway open excavation section inverted side-wall construction method |
| CN107090851A (en) * | 2017-04-24 | 2017-08-25 | 北京城建道桥建设集团有限公司 | The inverted side-wall construction method of downtown area open cut groove |
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2018
- 2018-07-20 CN CN201810799720.7A patent/CN108978709B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07150899A (en) * | 1993-11-30 | 1995-06-13 | Daiho Constr Co Ltd | Method for constructing underground large space structure, and the structure |
| CN103452561A (en) * | 2013-08-20 | 2013-12-18 | 中铁二局股份有限公司 | Vertical in-tunnel construction method of multilayer transverse channel of underground excavation station of metro, and construction method on east side and west side |
| CN103982188A (en) * | 2014-06-03 | 2014-08-13 | 中铁第一勘察设计院集团有限公司 | Supporting structure system of rock stratum large-section deep vertical shaft and construction method of supporting structure system |
| CN106150506A (en) * | 2016-07-08 | 2016-11-23 | 中铁十六局集团地铁工程有限公司 | A kind of gateway open excavation section inverted side-wall construction method |
| CN107090851A (en) * | 2017-04-24 | 2017-08-25 | 北京城建道桥建设集团有限公司 | The inverted side-wall construction method of downtown area open cut groove |
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