CN116716897A - Groove supporting method under limited space working condition - Google Patents
Groove supporting method under limited space working condition Download PDFInfo
- Publication number
- CN116716897A CN116716897A CN202310690779.3A CN202310690779A CN116716897A CN 116716897 A CN116716897 A CN 116716897A CN 202310690779 A CN202310690779 A CN 202310690779A CN 116716897 A CN116716897 A CN 116716897A
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- China
- Prior art keywords
- groove
- supporting
- limited space
- pile
- working condition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 26
- 238000009412 basement excavation Methods 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 8
- 238000011835 investigation Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000004575 stone Substances 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 239000011378 shotcrete Substances 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 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
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of underground pipeline trench construction, in particular to a trench supporting method under a limited space working condition, which is characterized by comprising the following steps: step one: site environment investigation; step two: determining a groove parameter; step three: designing supporting parameters; step four: constructing a miniature pile; step five: horizontal internal support construction; step six: hanging a net and spraying concrete; step seven: removing the inner support; the miniature piles and the internal support are adopted as the groove support form, so that the limitation on the vertical space and the horizontal space can be simultaneously solved, the vertical excavation of the groove is realized, the requirements of groove support and peripheral structure protection are met, the safety of the groove support can be ensured, and the protection requirement on the original crossing structure is met.
Description
Technical Field
The invention relates to the technical field of underground pipeline trench construction, in particular to a trench supporting method under a limited space working condition.
Background
With the continuous perfection of resident living conditions and the continuous enhancement of energy conservation and environmental protection consciousness, the urban central heating mainly comprising the cogeneration is rapidly developed in recent years, the annual national central heating area is steadily increased at 7% of the increasing speed according to statistics, the central heating heat source thermal power plants are widely distributed in urban suburbs and even farther, heat is inevitably transmitted to densely populated urban areas and can pass through structures such as high speed, railways and bridges, a heating pipeline is usually passed through in a direct buried mode, and the trench excavation depth is deeper and needs to be supported due to the larger network management diameter of the main urban heating pipe. The traditional trench supporting method mainly comprises natural slope releasing, soil nailing wall supporting, composite soil nailing wall supporting, cast-in-place pile supporting, underground continuous wall supporting, steel sheet pile supporting and the like; the natural slope is put, the soil nailing wall support and the composite soil nailing wall support need to expand the two sides of the original groove, and the influence on soil bodies at the two sides is larger; the construction method has the advantages that the construction height of the cast-in-place pile support and the underground continuous wall support is limited, and meanwhile, the construction speed is low and the construction cost is high; the steel sheet pile support is used as a common support method for municipal groove support, the lengths of the steel sheet piles are 9m, 12m, 15m and 18m, the heights of construction machines are added, and the construction operation is limited by the heights.
Disclosure of Invention
The invention provides a groove supporting method under the working condition of limited space, which can effectively solve the problem of limited construction working space under the special working condition and simultaneously ensure the safety of the groove and the protection safety of the original structure.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the trench supporting method under the working condition of a limited space is characterized by comprising the following steps of:
step one: the field environment investigation is carried out, and the surrounding field environment of the pipeline crossing is investigated in advance according to the pipeline crossing condition;
step two: determining the parameters of the groove, combining the construction condition of the pipeline and the burial depth of the pipeline, and simultaneously considering the crossing structural form and the position relation to determine the excavation width and depth of the groove;
step three: designing supporting parameters, and calculating the supporting parameters according to the parameters in the second step;
step four: the construction of the miniature pile, pre-excavating a pipe ditch in advance, positioning according to the designed hole diameter, the designed hole spacing and the designed row spacing, performing hole forming operation, installing a steel pipe, sealing the bottom, filling fine stones in the inner part and the outer part of the steel pipe, and grouting the miniature pile;
step five: constructing a horizontal internal support, namely constructing a horizontal steel pipe internal support at the bottom of the shearing bearing capacity of the micro pile, constructing a crown beam at the top of the micro pile along the length of the groove after the curing of the micro pile is finished, embedding a steel plate in the crown beam, and installing the horizontal internal support after the strength of the crown beam meets the requirement;
step six: hanging a net, spraying concrete, arranging an anchor spraying net in the miniature pile, and then spraying a concrete surface layer;
step seven: and (3) dismantling the inner support, namely after the pipeline construction finishes the backfilling of the groove and the bottom of the inner support, dismantling the inner support.
Further, in the first step, the original crossing structure form, the height of the crossing, the spatial position relation of the width, the hydrogeology and the underground obstacle are specifically investigated.
Further, the support parameters in the third step include the specifications, the spacing, the embedding depth, and the horizontal internal support specifications and the spacing of the micro piles.
In the third step, in order to prevent soil instability among piles, a net hanging reinforced concrete is arranged in the miniature piles.
In the fourth step, the pre-excavation is performed for the pipe ditch for 50cm in order to ensure that the micro pile does not influence the recovery of the upper pavement structure after the construction of the ditch is completed.
And in the fourth step, a built-in steel pipe is manually installed, the bottom of the steel pipe is sealed by adopting a sealing plate, fine stones are manually filled in the steel pipe and the outside of the steel pipe respectively, the hole is manually oscillated until the fine stones are filled, and grouting is carried out on the miniature pile according to the designed grouting pressure and grouting amount after the fine stones are backfilled.
And in the fifth step, the inner support is welded with the embedded steel plate in the crown beam.
Further, the net hanging and the sprayed concrete are constructed while the groove is excavated in the step six.
Through the technical scheme, the invention has the beneficial effects that:
the invention can be applied to the trench support of water conservancy and municipal pipelines in high speed, railway, bridge and other limited spaces, and adopts the micro pile and the internal support as the trench support form, thereby simultaneously solving the limitation of vertical space and horizontal space, realizing the vertical excavation of the trench, meeting the requirements of trench support and protection of peripheral structures, ensuring the safety of the trench support, meeting the protection requirement of the original traversing structure, having less influence on the periphery of the field, effectively guaranteeing civilian life, having small working area of process construction, small mechanical occupation, flexible operation, effectively solving the problem of limited space of the trench support, reducing the construction difficulty, accelerating the construction speed, and having the advantages of secondary utilization of partial materials, saving the construction period and cost and good economic benefit.
Drawings
FIG. 1 is a schematic construction diagram of a trench support method under a confined space condition of the present invention;
FIG. 2 is a schematic view of the structure of the anchor net of the present invention;
FIG. 3 is a schematic view of the structure of the micropile of the present invention;
FIG. 4 is a schematic view of the structure of the crown beam of the present invention;
fig. 5 is a schematic structural view of the pre-buried steel plate of the present invention.
The reference numerals in the drawings are: the pile comprises a pipeline 1, a miniature pile 2, a crown beam 3, an anchor spraying net 4, an inner support 5, a ground anchor reinforcing steel bar 6, a sealing plate 7 and a pre-buried steel plate 8.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
as shown in fig. 1 to 5, a method for supporting a trench under a limited space working condition is characterized by comprising the following steps:
step one: and (3) field environment investigation, namely, investigation of pipeline crossing surrounding field environments in advance according to pipeline crossing conditions, wherein the investigation comprises the steps of original crossing structural form, crossing position height, width space position relation, hydrogeology condition and underground barriers.
Step two: and determining the trench parameters, combining the pipeline construction condition and the pipeline burial depth, and determining the trench excavation width and depth by considering the crossing structure form and the position relation.
Step three: and (3) designing supporting parameters, namely calculating the specifications and the spacing of the micro pile 2, the embedding depth and the parameters of the spacing of the horizontal internal support 5 according to the excavation depth of the groove, the water stability geological condition and the site working conditions at two sides of the groove by theoretical stress, and arranging a net hanging steel bar shotcrete in the micro pile 2 in order to prevent soil instability between piles.
Step four: and (5) constructing the micro pile 2. In order to ensure that the micro pile 2 does not influence the restoration of the upper pavement structure after the groove construction is completed, pre-excavating the pipe ditch for 50cm in advance, positioning according to the designed hole diameter, distance and row spacing, adopting a low-power crawler-type pore-forming machine to perform pore-forming operation, manually installing a built-in steel pipe, sealing the bottom of the steel pipe by adopting a sealing plate 7, manually filling fine stones in the steel pipe and outside respectively, manually oscillating the pore-forming until the pore-forming is filled, and grouting the micro pile 2 according to the designed grouting pressure and grouting quantity after the fine stone backfilling is completed.
Step five: the horizontal internal support 5 is constructed, the horizontal steel pipe internal support 5 is firstly constructed before the groove is excavated, the crown beam 3 is constructed at the top of the miniature pile 2 along the length of the groove after the maintenance of the miniature pile 2 is finished, the steel plate is embedded in the interior, the horizontal internal support 5 is installed after the strength of the crown beam 3 meets the requirement, and the internal support 5 is welded with the steel plate embedded in the crown beam 3.
Step six: the method comprises the steps of hanging a net and spraying concrete, wherein in the trench excavation process, in order to prevent soil instability among piles, a spraying anchor net 4 is arranged inside a miniature pile 2, the spraying anchor net 4 is fixed on a pit wall by using a U-shaped ground anchor steel bar 6, then a concrete surface layer is sprayed, and the hanging net and the spraying concrete are constructed along with the trench excavation process.
Step seven: and (3) dismantling the inner support 5, and after the pipeline construction is completed and the groove is backfilled to the bottom of the inner support 5, dismantling the inner support 5 by a user.
The above embodiments are only preferred embodiments of the invention and do not limit the scope of the invention, so all equivalent changes or modifications made by the technical solution described in the patent claims are included in the scope of the invention.
Claims (8)
1. The trench supporting method under the working condition of a limited space is characterized by comprising the following steps of:
step one: investigation of the field environment, namely, investigation of the condition of crossing of the pipeline (1) in advance according to the crossing condition of the pipeline (1) to cross the surrounding field environment;
step two: determining the parameters of the groove, combining the construction condition of the pipeline (1) and the burial depth of the pipeline (1), and determining the excavation width and depth of the groove by considering the crossing structure form and the position relation;
step three: designing supporting parameters, and calculating the supporting parameters according to the parameters in the second step;
step four: the construction of the miniature pile (2), pre-excavating a pipe ditch in advance, positioning according to the designed hole diameter, the designed hole spacing and the designed row spacing, performing hole forming operation, installing a steel pipe, sealing the bottom, filling fine stones in the inner part and the outer part of the steel pipe, and grouting the miniature pile (2);
step five: constructing a horizontal internal support (5), constructing a horizontal steel pipe internal support (5) at the bottom of the shear bearing capacity of the micro pile (2), constructing a crown beam (3) at the top of the micro pile (2) along the length of a groove after the curing of the micro pile (2) is finished, embedding a steel plate in the crown beam (3), and installing the horizontal internal support (5) after the strength of the crown beam (3) meets the requirement;
step six: hanging a net, spraying concrete, arranging an anchor spraying net (4) in the miniature pile (2), and then spraying a concrete surface layer;
step seven: and (3) dismantling the inner support (5), and dismantling the inner support (5) after the construction of the pipeline (1) is completed and the groove backfilling is performed to the bottom of the inner support (5).
2. The method for supporting the trench under the limited space condition according to claim 1, wherein in the first step, the original crossing structure form, the height and width space position relation of the crossing position, the hydrogeological condition and the underground obstacle are specifically investigated.
3. The method according to claim 1, wherein the supporting parameters in the third step include the specifications and the spacing of the micro piles (2), the embedding depth and the specifications and the spacing of the horizontal inner supports (5).
4. The method for supporting the groove under the working condition of the limited space according to claim 1, wherein in the third step, in order to prevent soil instability among piles, a hanging net reinforced sprayed concrete is arranged in the miniature pile (2).
5. The method for supporting the groove under the working condition of the limited space according to claim 1, wherein in the fourth step, the pre-excavation is performed on the groove for 50cm in order to ensure that the micro pile (2) does not influence the upper pavement structure recovery after the groove construction is completed.
6. The method for supporting the groove under the working condition of the limited space according to claim 1, wherein in the fourth step, a built-in steel pipe is manually installed, the bottom of the steel pipe is sealed by a sealing plate (7), fine stones are manually filled in the steel pipe and the outside of the steel pipe respectively, the holes are manually oscillated until the fine stones are filled, and grouting is carried out on the micro pile (2) according to the designed grouting pressure and grouting amount after the backfilling of the fine stones is completed.
7. The method for supporting the groove under the limited space working condition according to claim 1, wherein the inner support (5) in the fifth step is welded with the embedded steel plate (8) in the crown beam (3).
8. The method for supporting the groove under the limited space working condition according to claim 1, wherein the hanging net and the sprayed concrete are constructed while being excavated along with the groove excavation process in the step six.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310690779.3A CN116716897A (en) | 2023-06-12 | 2023-06-12 | Groove supporting method under limited space working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310690779.3A CN116716897A (en) | 2023-06-12 | 2023-06-12 | Groove supporting method under limited space working condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116716897A true CN116716897A (en) | 2023-09-08 |
Family
ID=87871078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310690779.3A Pending CN116716897A (en) | 2023-06-12 | 2023-06-12 | Groove supporting method under limited space working condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116716897A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975375A (en) * | 2017-10-24 | 2018-05-01 | 济南城建集团有限公司 | A kind of miniature steel pipe pile reinforced soft foundation construction method of city tunnel |
| CN216586567U (en) * | 2021-11-16 | 2022-05-24 | 中国建筑第四工程局有限公司 | Pit-in-pit miniature pile supporting structure |
-
2023
- 2023-06-12 CN CN202310690779.3A patent/CN116716897A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975375A (en) * | 2017-10-24 | 2018-05-01 | 济南城建集团有限公司 | A kind of miniature steel pipe pile reinforced soft foundation construction method of city tunnel |
| CN216586567U (en) * | 2021-11-16 | 2022-05-24 | 中国建筑第四工程局有限公司 | Pit-in-pit miniature pile supporting structure |
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