CN113738399A - Underground excavation tunnel large pipe shed guide wall structure and construction method thereof - Google Patents
Underground excavation tunnel large pipe shed guide wall structure and construction method thereof Download PDFInfo
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- CN113738399A CN113738399A CN202111022653.6A CN202111022653A CN113738399A CN 113738399 A CN113738399 A CN 113738399A CN 202111022653 A CN202111022653 A CN 202111022653A CN 113738399 A CN113738399 A CN 113738399A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000009412 basement excavation Methods 0.000 title abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 9
- 239000011083 cement mortar Substances 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000006467 substitution reaction 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
- 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a large pipe shed guide wall structure of an underground excavation tunnel and a construction method thereof, wherein the large pipe shed guide wall structure comprises a guide wall positioned outside an underground excavation tunnel portal, large pipe shed embedded sleeves circumferentially arranged at intervals on the inner edge of the guide wall, and a large pipe shed, wherein the large pipe shed embedded sleeves longitudinally penetrate through the guide wall, and are applied to bedrock at the top of an underground excavation tunnel body by the large pipe shed embedded sleeves; the guide wall and the open cut structure fender pile are nested, the width of the guide wall is equal to the diameter of the open cut structure fender pile, main ribs of the open cut structure fender pile are anchored, the whole body is formed by pouring, the guide wall is supported on the open cut structure fender pile, and the open cut structure fender pile is embedded and fixed in a rock soil layer below. The invention has the advantages of good integrity, clear force transmission path, space saving, safety and reliability, and can reduce the influence on the main structure of the working well by constructing the guide wall and the large pipe shed in advance. The method can be used for arranging the large pipe shed guide wall of the underground tunnel of the subway, the railway and the municipal administration, and has strong practicability and good popularization.
Description
Technical Field
The invention belongs to the field of municipal engineering and road traffic, and particularly relates to a large pipe shed guide wall structure in the field of laying large pipe sheds in underground-excavation mine-method tunnels and a construction method thereof, and relates to the field of constructing large pipe sheds in open-cut working wells of all underground-excavation mine-method tunnels.
Background
With the continuous development of the urbanization process of China, the development of underground space shows a rapid development trend, and underground constructions such as underground sidewalks, river-crossing tunnels, urban rail transit and the like are more and more. The tunnel construction is limited by factors such as ground traffic, pipeline distribution, surrounding construction environment, engineering geology, hydrogeology, use functions and the like, the mine method construction is often adopted, in order to ensure the safety of a tunnel entering construction section in the mine method tunnel construction, advanced support measures such as a large pipe shed and the like are generally needed to be arranged, and the large pipe shed advanced support usually concerns the safety of an underground excavation tunnel, so that great attention is paid.
For the arrangement of the large pipe shed, the arrangement of the guide wall of the large pipe shed also has the concerns of whether the large pipe shed can be accurately positioned, the stress is reasonable and the whole is reliable. The general method in the current engineering practice has two types, wherein the first scheme is that a guide wall is directly and independently arranged on the inner side of the enclosure structure; and the second scheme is that a large pipe shed is constructed after the construction of the inner structure of the working well is completed, and the embedded pipes are embedded in the side walls of the inner structure. Through years of engineering practice demonstration, the following problems are found:
the first scheme is as follows:
(1) the guide wall is positioned on the inner side of the enclosure structure, is difficult to connect with the enclosure structure, has poor integral stability and needs to be provided with a vertical force transmission structure independently;
(2) the guide wall is positioned between the enclosure structure and the open cut main structure, a fertilizer groove needs to be arranged, waterproof construction of the open cut structure and backfill construction of the fertilizer groove are difficult, and construction quality is difficult to guarantee;
(3) the guard piles need to be penetrated during the construction of the large pipe shed, the requirement on drilling machinery is high, the drilling time is long, and the horizontal angle is difficult to guarantee.
Scheme II:
(1, the embedded sleeve is arranged in the side wall of the internal structure, so that the waterproof construction difficulty of the side wall is increased, and the waterproof effect is difficult to ensure;
(2) the embedded sleeves are continuously arranged in the side wall of the internal structure within a certain range, so that the rigidity of the side wall is weakened to a certain extent;
(3) in site construction, a vault large pipe shed often collides with a middle plate of a main structure, the large pipe shed is constructed in a later period, a large pipe shed operation hole needs to be reserved in the middle plate, the hole area is large, subsequent plugging is needed, and the integrity of the main structure is influenced;
(4) the guard piles need to be penetrated during the construction of the large pipe shed, the requirement on drilling machinery is high, the drilling time is long, and the horizontal angle is difficult to guarantee.
Disclosure of Invention
The invention aims to overcome the defects and provides a structure and a construction method thereof, wherein the structure is formed by nesting a large pipe shed guide wall and a fender post, has good integrity, saves space, is safe and reliable, is used for constructing the guide wall and the large pipe shed in advance and reducing the influence on the main structure of a working well. The structure and the construction method thereof improve the integrity and stability of the stress of the guide wall, improve the drilling efficiency and levelness control of the large pipe shed, better ensure the construction quality and advanced reinforcement effect of the large pipe shed and ensure the safety and reliability of the construction of the hidden excavation and the hole entry.
In order to achieve the purpose, the technical content of the invention is as follows:
a large pipe shed guide wall structure of an underground excavated tunnel comprises a guide wall positioned outside an opening of the underground excavated tunnel, large pipe shed embedded sleeves circumferentially arranged at intervals along an arch part of the inner edge of the guide wall, and a large pipe shed which longitudinally penetrates through the guide wall and is constructed by the large pipe shed embedded sleeves to bedrock at the top of a tunnel body of the underground excavated tunnel; the guide wall and the open-cut structure fender pile are nested, the width of the guide wall is equal to the diameter of the open-cut structure fender pile, the open-cut structure fender pile is anchored with main ribs of the open-cut structure fender pile, the guide wall, the large pipe shed embedded sleeve, the large pipe shed and the open-cut structure fender pile are integrated through poured concrete, the guide wall is supported on the open-cut structure fender pile, and the open-cut structure fender pile is embedded and fixed in a rock soil layer below.
The guide wall is a rectangular section arc beam made of reinforced concrete; the large pipe shed embedded sleeve is a round steel pipe; the large pipe shed is a circular steel pipe structure which is filled with cement mortar and has a large length; the open cut structure fender pile is an engineering pile with the pile diameter and the pile spacing meeting the engineering requirement size range.
Further, horizontally drilling holes in the large pipe shed embedded sleeves to construct a large pipe shed; and cement mortar is filled in a gap between the large pipe shed embedded sleeve and the large pipe shed.
Further, the method for nesting the guide wall and the open cut structure fender post comprises the following steps: determining the size and the positioning of the guide wall, chiseling the open cut structure fender post one by one, binding the guide wall reinforcing steel bars, embedding the large pipe shed embedded sleeve, and pouring concrete section by section.
Furthermore, the width of the guide wall is equal to the diameter of the open cut structure fender post, and the height of the large pipe shed guide wall is determined according to the distance of the center line of the large pipe shed deviating from the outer side line of the primary support, but not less than 600 mm;
furthermore, the large pipe shed embedded sleeve is made of steel pipes, the wall thickness is not less than 6mm, the diameter is selected according to the specification of the large pipe shed, generally not less than 159mm, the large pipe shed embedded sleeve can be adjusted according to the specific engineering situation and the field situation, and the large pipe shed embedded sleeve can include all model ranges meeting the engineering requirements and meeting the size.
Furthermore, the large pipe shed is made of steel pipes, the wall thickness is not less than 6mm, the diameter is not less than 108mm, the large pipe shed can be adjusted according to specific engineering conditions and field conditions, and the large pipe shed can comprise all model ranges meeting the engineering requirements and meeting the size.
The invention also provides a construction method of the underground excavated tunnel large pipe shed guide wall structure, which comprises the following steps:
under the prerequisite of guaranteeing work well foundation pit atress and deformation stability, the excavation structure fender pile is dug one by one, the big pipe shed guide wall reinforcing bar of ligature, pre-buried big pipe shed pre-buried sleeve pipe, the setting is gone into to the main muscle anchor of excavation structure fender pile atress, and the concrete is pour to the segmentation formwork, connects into whole guide wall structure, beats after guide wall intensity reaches design strength and establishes big pipe shed.
Compared with the prior art, the invention has the beneficial effects that:
according to the large pipe shed guide wall structure of the underground excavated tunnel, the large pipe shed guide wall and the guard piles are nested, the integrity is good, the large pipe shed fulcrum force is transmitted to the guard piles, the transmission reliability is guaranteed, and the stability is good; the integrity of the guard post in the vault range of the underground excavated tunnel is increased; the construction quality, the construction period and the effect requirements of the large pipe shed are ensured; the influence on the main structure of the open cut working well is reduced; saving space, safety and reliability.
Drawings
Fig. 1 is a plan view of the guide wall structure of the large pipe shed of the invention.
Fig. 2 is a node diagram of the guide wall structure of the large pipe shed.
Fig. 3 is an overall cross-sectional layout view of an open cut working well and an underground cut tunnel junction of the present invention.
Fig. 4 is an overall longitudinal sectional view of the interface between the open cut working well and the underground cut tunnel according to the present invention.
In the figure: 1-guide wall, 2-large pipe shed embedded sleeve, 3-large pipe shed and 4-open cut structure fender pile.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Examples
The large pipe shed guide wall structure of the underground tunnel adopted by the embodiment comprises a guide wall 1 positioned outside an opening of the underground tunnel, large pipe shed embedded sleeves 2 arranged at intervals along the circumferential direction of an arch part in the guide wall 1, and a large pipe shed 3 constructed by the large pipe shed embedded sleeves 2 to bedrock at the top of the underground tunnel body, wherein the large pipe shed embedded sleeves 2 longitudinally penetrate through the guide wall 1; guide wall 1 and 4 nested settings of open cut structure fender post, the same open cut structure fender post 4 diameters of guide wall 1 width, open cut structure fender post 4 anchor has open cut structure fender post owner muscle, make guide wall 1, big pipe shed embedded sleeve 2, big pipe shed 3, open cut structure fender post 4 form wholly through the concrete of pouring, guide wall 1 supports on open cut structure fender post 4, open cut structure fender post 4 inlays admittedly in the rock soil layer of below. Horizontally drilling a large pipe shed 3 in the large pipe shed embedded sleeve 2; cement mortar is filled in a gap between the large pipe shed embedded sleeve 2 and the large pipe shed 3.
Big pipe shed guide wall 1 and open cut structure fender pile 4 nested setting, and the 1 width of guide wall is 1000mm with open cut structure fender pile 4 diameters. The distance of the central line of the large pipe shed deviating from the outer sideline of the primary support is 400mm, and the height of the large pipe shed guide wall 1 is 800 mm. The large pipe shed embedded sleeve 2 is made of steel pipes, the wall thickness is 8mm, and the diameter is selected to be 219mm according to the large pipe shed specification. The large pipe shed is made of steel pipes, the wall thickness is 8mm, and the diameter is 159 mm.
The construction of the embodiment mainly comprises the following steps:
the first step is as follows: constructing an enclosure structure of the open cut working well, erecting each support, pre-adding axial force according to design requirements, checking and calculating stress and stability of a broken cantilever section of a single enclosure pile according to the most unfavorable working condition, and ensuring the safety of a foundation pit;
the second step is that: determining a central line of the large pipe shed according to a primary supporting side line of the underground excavation region, determining the vertical height of the guide wall according to specific engineering conditions, and setting out to determine the chiseling range of each fender pile in the related range;
the third step: chiseling off the open cut structure fender posts 4 from the vault of the underground tunnel to two sides one by one, binding the steel bars of the guide wall 1, embedding the large pipe shed embedded sleeve 2, anchoring the stressed main bars of the open cut structure fender posts 4, and pouring concrete by section formwork support;
the fourth step: the construction of the large pipe shed guide wall 1 is completed, the large pipe shed 3 is constructed after the design strength is reached, and the large pipe shed is grouted and reinforced.
The size of the large pipe shed guide wall is not limited to that shown in the figure, and can be adjusted according to the specific engineering conditions, the field installation conditions and the like, the adjustment principle is that the large pipe shed guide wall is convenient for field construction, is reasonable in stress, meets the requirements of bearing capacity and stability, and all size ranges meeting the engineering requirements are included.
In the embodiment, the components are connected in a welding mode in site construction and installation, the height and the quality of a welding seam in the welding process need to meet the requirements of the current relevant specifications, the welding seam meets the requirements of bearing capacity and construction, the welding seam is detected according to the relevant specifications if necessary, and the detection can be implemented if the welding seam is qualified.
The construction of chiseling the enclosure piles is to satisfy the design requirements on the bearing capacity and stability of the enclosure piles, and on the premise that the erection of each support is completed and the support is reliable, the support arrangement can be adjusted according to the specific conditions of the engineering and the field conditions, and the support arrangement comprises all size ranges meeting the engineering requirements;
the present invention has been described in further detail with reference to the specific preferred embodiments, and it is not to be construed that the embodiments of the present invention are limited to the description. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A large pipe shed guide wall structure of an underground excavated tunnel comprises a guide wall (1) positioned outside an opening of the underground excavated tunnel, large pipe shed embedded sleeves (2) arranged at intervals along the circumferential direction of an arch part on the inner edge of the guide wall (1), and a large pipe shed (3) which is longitudinally penetrated through the guide wall (1) and is constructed to bedrock at the top of an underground excavated tunnel body by the large pipe shed embedded sleeves (2); the guide wall structure is characterized in that the guide wall (1) is supported on an open-cut structure fender post (4), the guide wall (1) and the open-cut structure fender post (4) are arranged in a nested mode, the width of the guide wall (1) is the same as the diameter of the open-cut structure fender post (4), an open-cut structure fender post main rib is anchored into the open-cut structure fender post (4), the guide wall (1), a large pipe shed embedded sleeve (2), a large pipe shed (3) and the open-cut structure fender post (4) are integrated through poured concrete, and the open-cut structure fender post (4) is embedded in a rock soil layer below.
2. The structure of the guide wall for the large pipe shed of the underground excavated tunnel according to claim 1, wherein the large pipe shed (3) is horizontally drilled in the large pipe shed embedded sleeve (2), and cement mortar is filled in a gap between the large pipe shed embedded sleeve (2) and the large pipe shed (3).
3. The large pipe shed guide wall structure of the underground excavated tunnel according to claim 1, wherein the height of the guide wall (1) is determined according to the distance of the center line of the large pipe shed from the outer side line of the primary support, and is not less than 600 mm.
4. The underground excavated tunnel large pipe shed guide wall structure according to claim 1, wherein the large pipe shed embedded sleeve (2) is a steel pipe, the wall thickness is not less than 6mm, and the diameter is not less than 159 mm.
5. The underground excavated tunnel large pipe shed guide wall structure according to claim 1, wherein the wall thickness of the steel pipe of the large pipe shed (3) is not less than 6mm, and the diameter of the steel pipe is not less than 108 mm; and after the steel pipe is arranged, cement mortar is poured into the steel pipe.
6. The underground excavated tunnel big pipe shed guide wall structure according to claim 1, characterized in that the method for nesting the guide wall (1) and the open excavated structure fender post (4) is as follows: determining the size and the positioning of the guide wall (1), chiseling the open cut structure guard piles (4) one by one, binding guide wall reinforcing steel bars, embedding the large pipe shed embedded sleeve (2), and pouring concrete section by section.
7. The construction method of the underground excavated tunnel big pipe shed guide wall structure according to claim 1, comprising the steps of:
s1: chiseling off the open cut structure fender post (4) one by one on the premise of ensuring the stable stress and deformation of the foundation pit of the working well,
s2: binding steel bars of a large pipe shed guide wall (1), embedding a large pipe shed embedded sleeve (2), and anchoring stressed main bars of open cut structure fender posts (4);
s3: and (3) pouring concrete by the sectional formwork, connecting the concrete into an integral guide wall structure, and constructing a large pipe shed (3) after the strength of the guide wall reaches the design strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111022653.6A CN113738399A (en) | 2021-09-01 | 2021-09-01 | Underground excavation tunnel large pipe shed guide wall structure and construction method thereof |
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| CN202111022653.6A CN113738399A (en) | 2021-09-01 | 2021-09-01 | Underground excavation tunnel large pipe shed guide wall structure and construction method thereof |
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Cited By (2)
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| CN114961748A (en) * | 2022-06-23 | 2022-08-30 | 中铁九局集团第三建设有限公司 | Construction method of large pipe shed guide wall at tunnel opening of shallow tunnel |
| CN116201171A (en) * | 2023-03-17 | 2023-06-02 | 陕西建工铁建工程有限公司 | Construction system and construction method for open cut air shaft and underground cut air duct |
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| CN116201171A (en) * | 2023-03-17 | 2023-06-02 | 陕西建工铁建工程有限公司 | Construction system and construction method for open cut air shaft and underground cut air duct |
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