CN109594574B - Large pipe jacking open caisson reverse construction method based on limited space - Google Patents
Large pipe jacking open caisson reverse construction method based on limited space Download PDFInfo
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- CN109594574B CN109594574B CN201811515094.0A CN201811515094A CN109594574B CN 109594574 B CN109594574 B CN 109594574B CN 201811515094 A CN201811515094 A CN 201811515094A CN 109594574 B CN109594574 B CN 109594574B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- 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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
Abstract
The invention discloses a large pipe-jacking open caisson top-down construction method based on limited space, which is used for leveling a pre-construction field; determining the ground position of the open caisson excavation according to design requirements; performing the construction of the sinking fender pile according to the measured paying-off position; then, excavating earth on the surface; rechecking the space position of the excavated space; constructing a first section of reinforced concrete structure of the open caisson; after the construction of the first section of structure is completed, open caisson earthwork excavation construction is carried out; constructing concrete structures on the north and south sides of the open caisson; excavating earthwork in the structural range of the second section of open caisson; constructing concrete structures on the east and west sides of the open caisson; the subsequent sections of the open caisson are constructed after the second section is constructed, open caisson bottom sealing construction is carried out, deformation of the earth surface and the enclosure structure, cross construction of foundation pit excavation and a main structure and self load of a reverse construction structure are effectively controlled and directly transmitted to the foundation through the stand columns, meanwhile, the influence of excavation unloading on a bearing layer is reduced, construction safety is improved, and meanwhile, the environment is protected.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a large-scale pipe jacking open caisson reverse construction method based on a limited space.
Background
In urban rail transit construction, a large number of municipal pipelines, gas, tap water and rain sewage pipelines need to be moved and modified due to construction requirements, wherein high-voltage cables such as 220KV, 110KV and 10KV with high risks, medium-voltage gas pipelines, high-voltage large-diameter tap water main pipelines and other large numbers of municipal pipelines need to be moved frequently. In actual construction, some pipelines are difficult to migrate and interfere with a station structure of rail transit, so that a lot of difficulties are brought to rail transit construction, and how to solve the construction problems needs to perform comparison and selection of multiple construction schemes and select an optimal scheme from the multiple construction schemes.
In some constructions, pipelines need to pass through a main trunk in the migration, and in order to ensure the smoothness of the main trunk, underground (high-pressure) pipelines are migrated by a multi-pass pipe jacking method, most of jacking pipes are less than 1.5m in diameter, and fewer jacking pipes with the pipe diameter of 3m are used. According to the technology of pipe-jacking construction, the open caisson must be constructed first, the depth of the open caisson is usually affected by various external factors, the existing underground obstacles can be avoided safely only by needing large burial depth, the burial depth of the open caisson is increased, and the difficulty and risk of construction are greatly increased.
Disclosure of Invention
The invention aims to provide a large pipe jacking open caisson reverse construction method based on limited space, which effectively controls the deformation of the earth surface and a retaining structure, the cross construction of foundation pit excavation and a main body structure, and the direct transmission of the self load of a reverse construction structure to a foundation through an upright column, reduces the influence of excavation unloading on a bearing stratum, improves the construction safety, is beneficial to protecting the environment, and meets the requirement of green construction.
In order to achieve the purpose, the invention provides a reverse construction method of a large pipe-jacking open caisson based on a limited space, which comprises the following steps:
A. leveling the field: leveling a pre-constructed field, removing foreign matters on the ground, and enclosing and sealing the construction field according to the requirement of green construction;
B. lofting for the first measurement: determining the ground position of the open caisson excavation according to design requirements;
C. constructing a steel sheet pile: constructing a fender post before the open caisson is excavated according to the measured setting-out position;
D. excavating the earth on the first layer: excavating earth surface soil bodies after the construction of the steel sheet piles is finished;
E. and (3) second measurement lofting: rechecking the space position of the excavation space after the first layer of excavation is finished;
F. construction of a first-section structure: constructing a first section of reinforced concrete structure of the open caisson;
G. and (5) excavating a second earth-saving side: after the construction of the first section of structure is completed, open caisson earthwork excavation construction is carried out;
H. the second section of north-south structure is inverted: constructing concrete structures on the north and south sides of the open caisson;
I. excavating east-west earthwork of a second section: excavating earthwork in the structural range of the second section of open caisson;
J. and (3) constructing a second east-west structure: constructing concrete structures on the two sides of the open caisson;
K. subsequent segment construction and bottom sealing: and constructing subsequent sections of the open caisson in sequence after the construction of the east-west structure of the second section, and finally performing open caisson bottom sealing construction.
Preferably, the fender pile adopts a Larsen sheet pile with a water stopping function, and the Larsen sheet pile forms connection by means of the connecting groove.
Preferably, the first layer of earthwork excavation is earth surface soil excavation performed after the construction of the steel sheet pile is finished, the excavation depth of the first layer of earthwork excavation meets the height of the first section of structure of the open caisson, and the supporting effect of the fender post on the soil body meets the requirement of soil body stability.
Preferably, the first section of structure construction is carried out after the first layer of earthwork excavation is finished and the excavation size is checked again through measurement, and then steel bar binding, concrete pouring and maintenance construction of the first section of open caisson structure are carried out.
Preferably, the excavation depth of the second section of earth excavation meets the requirement of the height of the second section of open caisson, soil bodies at the concrete bottom of the first sections of open caisson on the east and west sides are reserved in the excavation process, then soil bodies on the north and south sides are excavated, and the excavation size meets the requirement of the open caisson structure size.
Preferably, the second section of the south-north structure is reversely constructed by binding the reinforcing steel bars of the open caisson structure on the south and north sides and pouring concrete after the earth excavation on the south and north sides meets the design requirements.
Preferably, after the second east-west earth excavation is finished for the construction of the north-south concrete structure and reaches the strength required by the design, the east-west earth body is excavated and the design requirement is met.
Preferably, after the second east-west east soil body excavation meets the design requirements, reinforcement and concrete pouring construction of the open caisson structure is carried out.
Preferably, the subsequent segment construction and bottom sealing are the third segment open caisson structure construction according to the construction method of the second segment open caisson, the fourth segment open caisson structure can be continuously constructed according to the open caisson design, and the open caisson bottom sealing construction is carried out according to the design requirements after the structure meets the design requirements.
Therefore, the large pipe-jacking open caisson reverse construction method based on the limited space, which adopts the structure, effectively controls the deformation of the earth surface and the enclosure structure, the cross construction of the excavation of the foundation pit and the main structure, and the direct transmission of the self load of the reverse construction structure to the foundation by the upright post, simultaneously reduces the influence of excavation unloading on the bearing layer, improves the construction safety, is beneficial to protecting the environment, and meets the requirement of green construction.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of an embodiment of a large pipe jacking open caisson reverse construction method based on limited space.
Detailed Description
Examples
FIG. 1 is a flow chart of an embodiment of a large pipe jacking open caisson reverse construction method based on limited space. As shown in the figure, the invention provides a large pipe jacking open caisson reverse construction method based on a limited space, which comprises the following steps:
A. leveling the field: leveling a pre-constructed field, removing foreign matters on the ground, and enclosing and sealing the construction field according to the requirement of green construction;
B. lofting for the first measurement: determining the ground position of the open caisson excavation according to design requirements;
C. constructing a steel sheet pile: according to the measurement and setting-out position, carrying out guard pile construction before open caisson excavation, wherein the guard pile adopts Larsen sheet piles with water stopping functions, and the Larsen sheet piles form connection by means of connecting grooves;
D. excavating the earth on the first layer: excavating earth surface soil bodies after the construction of the steel sheet piles is finished, wherein the excavation depth meets the height of a first section structure of the open caisson, and the supporting effect of the fender piles on the soil bodies meets the requirement of soil body stability;
E. and (3) second measurement lofting: rechecking the space position of the excavation space after the first layer of excavation is finished;
F. construction of a first-section structure: constructing a first section of reinforced concrete structure of the open caisson, namely binding reinforcing steel bars of the first section of open caisson structure, pouring concrete and maintaining construction;
G. and (5) excavating a second earth-saving side: carrying out open caisson earthwork excavation construction after the construction of the first section of structure is finished, wherein the excavation depth of the second section of earthwork excavation meets the requirement of the height of the second section of open caisson, reserving soil bodies at the bottoms of the first sections of open caisson concrete on the east and west sides in the excavation process, excavating soil bodies on the south and north sides, and ensuring that the excavation size meets the requirement of the open caisson structure size so as to prevent the first section of open caisson structure from sinking due to dead weight;
H. the second section of north-south structure is inverted: constructing concrete structures on the south and north sides of the open caisson, and binding reinforcing steel bars and pouring concrete of the open caisson structure on the south and north sides after the earth excavation on the south and north sides meets the design requirements;
I. excavating east-west earthwork of a second section: excavating earthwork in the structural range of the second section of open caisson, excavating soil bodies on the east and west sides after construction for the north and south concrete structures is finished and the strength reaches the design requirement, and meeting the design requirement;
J. and (3) constructing a second east-west structure: constructing concrete structures on the east and west sides of the open caisson, and performing reinforcement binding and concrete pouring construction on the open caisson structure after the design requirements are met for soil excavation on the east and west sides;
K. subsequent segment construction and bottom sealing: and constructing subsequent sections of the open caisson in sequence after the construction of the second section of the structure, finally performing open caisson bottom sealing construction, constructing a third section of open caisson structure according to the construction method of the second section of the open caisson, continuously constructing a fourth section of open caisson structure according to the open caisson design, performing open caisson bottom sealing construction according to the design requirement until the structure meets the design requirement, ensuring the quality of construction joint concrete for chiseling hair, and ensuring the waterproof performance of the structure.
The invention solves the problem that the large buried depth pipe-jacking open caisson is constructed by adopting a reverse construction method in a composite stratum with soft upper stratum and narrow available ground space in the construction of the large pipe-jacking open caisson, is favorable for ensuring normal traffic order and is also favorable for quickly, safely and efficiently completing pipeline moving and modifying construction.
Therefore, the large pipe-jacking open caisson reverse construction method based on the limited space, which adopts the structure, effectively controls the deformation of the earth surface and the enclosure structure, the cross construction of the excavation of the foundation pit and the main structure, and the direct transmission of the self load of the reverse construction structure to the foundation by the upright post, simultaneously reduces the influence of excavation unloading on the bearing layer, improves the construction safety, is beneficial to protecting the environment, and meets the requirement of green construction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (9)
1. A large pipe jacking open caisson reverse construction method based on limited space is characterized by comprising the following steps:
A. leveling the field: leveling a pre-constructed field, removing foreign matters on the ground, and enclosing and sealing the construction field according to the requirement of green construction;
B. lofting for the first measurement: determining the ground position of the open caisson excavation according to design requirements;
C. constructing a steel sheet pile: constructing a fender post before the open caisson is excavated according to the measured setting-out position;
D. excavating the earth on the first layer: excavating earth surface soil bodies after the construction of the steel sheet piles is finished;
E. and (3) second measurement lofting: rechecking the space position of the excavation space after the first layer of excavation is finished;
F. construction of a first-section structure: constructing a first section of reinforced concrete structure of the open caisson;
G. and (5) excavating a second earth-saving side: after the construction of the first section of structure is completed, open caisson earthwork excavation construction is carried out;
H. the second section of north-south structure is inverted: constructing concrete structures on the north and south sides of the open caisson;
I. excavating east-west earthwork of a second section: excavating earthwork in the structural range of the second section of open caisson;
J. and (3) constructing a second east-west structure: constructing concrete structures on the two sides of the open caisson;
K. subsequent segment construction and bottom sealing: and constructing subsequent sections of the open caisson in sequence after the construction of the east-west structure of the second section, and finally performing open caisson bottom sealing construction.
2. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: the fender pile adopts the Larsen sheet pile who has the stagnant water function, Larsen sheet pile relies on the connecting groove to form the connection.
3. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: the first layer of earthwork excavation is earth surface soil excavation performed after the construction of the steel sheet pile is finished, the excavation depth of the first layer of earthwork excavation meets the height of a first section structure of the open caisson, and the supporting effect of the fender pile on the soil body meets the soil body stability requirement.
4. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: and (3) constructing the first section of structure, after the first layer of earthwork is excavated and the excavation size is rechecked through measurement, binding the reinforcing steel bars of the first section of open caisson structure, pouring concrete and maintaining the first section of open caisson structure.
5. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: the excavation depth of the excavation of the second section of earth meets the requirement of the height of the second section of open caisson, soil bodies at the concrete bottom of the first sections of open caisson on the east and west sides are reserved in the excavation process, then soil bodies on the north and south sides are excavated, and the excavation size meets the requirement of the open caisson structure size.
6. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: and the second section of the south-north structure reverse construction is to perform reinforcement binding and concrete pouring of the open caisson structure on the south and north sides after the earth excavation on the south and north sides meets the design requirements.
7. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: and excavating east and west soil bodies after the second east and west earth excavation is finished for the construction of the north and south concrete structure and reaches the strength required by the design, and meeting the design requirement.
8. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: and (4) after the east-west side soil body excavation meets the design requirements by the second east-west side structure construction, performing reinforcement and concrete pouring construction of the open caisson structure.
9. The reverse construction method of the large pipe-jacking open caisson based on the limited space according to claim 1, which is characterized in that: and the subsequent segment construction and bottom sealing are that the third segment of open caisson structure construction is constructed according to the construction method of the second segment of open caisson, the fourth segment of open caisson structure is continuously constructed according to the open caisson design, and the open caisson bottom sealing construction is carried out according to the design requirement after the structure meets the design requirement.
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| CN113216294B (en) * | 2021-05-14 | 2022-02-15 | 南京工业大学 | Narrow area soil body excavation equipment for reverse construction and construction method |
| CN113802608B (en) * | 2021-10-22 | 2022-12-20 | 武汉市武昌市政建设(集团)有限公司 | Open caisson structure applied to narrow zone and construction method thereof |
| CN114319405A (en) * | 2021-12-10 | 2022-04-12 | 上海市基础工程集团有限公司 | Construction method for micro-disturbance vertical press-in type thin-wall open caisson in complex environment |
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| JP4358040B2 (en) * | 2004-06-17 | 2009-11-04 | 千葉窯業株式会社 | Caisson etc. |
| CN102635124B (en) * | 2012-04-23 | 2014-12-03 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN103195158B (en) * | 2013-04-03 | 2014-12-10 | 济南城建集团有限公司 | Municipal drainage pipeline slurry balance pipe-jacking construction method |
| CN106369223B (en) * | 2016-10-31 | 2018-04-10 | 中铁二十局集团第五工程有限公司 | A kind of silt stratum pipe jacking construction method |
| JP6826914B2 (en) * | 2017-03-03 | 2021-02-10 | 鹿島建設株式会社 | Inclination suppression method when caisson is sunk |
| CN107975040A (en) * | 2017-11-30 | 2018-05-01 | 上海宝冶集团有限公司 | Circular top pipe working pit multiple material handling method of deep foundation pit construction method |
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