CN111287190B - Construction method for open-cut and underground-buried tunnel under condition that foundation pit has stand column - Google Patents
Construction method for open-cut and underground-buried tunnel under condition that foundation pit has stand column Download PDFInfo
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- CN111287190B CN111287190B CN202010095628.XA CN202010095628A CN111287190B CN 111287190 B CN111287190 B CN 111287190B CN 202010095628 A CN202010095628 A CN 202010095628A CN 111287190 B CN111287190 B CN 111287190B
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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
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a construction method of an open-cut and buried tunnel under the condition that a foundation pit is provided with a stand column, which comprises the following steps: constructing an enclosure structure around an area of a tunnel to be constructed, and constructing a plurality of stand columns in the enclosure structure at intervals; excavating the soil body in the enclosure structure to a set elevation to form a foundation pit, and arranging at least two horizontal supports fixedly connected with the stand columns on the inner wall of the enclosure structure from top to bottom at intervals along with the excavation depth; arranging a plurality of inclined struts between the horizontal supports and the parts corresponding to the upright columns, and cutting off the parts of the upright columns, which are positioned between the bottom surface of the foundation pit and the horizontal supports close to the bottom surface of the foundation pit; and constructing and forming a tunnel between the bottom surface of the foundation pit and the horizontal support close to the bottom surface of the foundation pit, and backfilling soil body above the tunnel to fill and level the foundation pit. The invention effectively solves the problem that the construction of the tunnel structure is difficult due to the existence of the stand column, avoids the obstruction of the stand column to the tunnel construction under the condition of ensuring the strength of the foundation pit, improves the construction efficiency, ensures the construction quality and reduces the hidden danger of water leakage.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method of an open-cut buried tunnel under the condition that a foundation pit has an upright column.
Background
In the open cut tunnel construction process of secretly burying, generally excavate earlier the foundation ditch and construct tunnel structure in the foundation ditch, when tunnel position is darker, need set up reinforced concrete support system in the foundation ditch, support system includes horizontal support beam and vertical support post, the stand sets up the position that intersects at a supporting beam, generally be steel pipe or lattice column, the below of every stand is equipped with the pile foundation in order to undertake the load, after the foundation ditch excavation is accomplished, when tunnel structure is under construction, generally pour stand and tunnel structure together, and set up stagnant water steel sheet in the position that the stand passed tunnel structure, treat that tunnel structure construction accomplishes the back and cut off the stand part that exposes in the tunnel.
When the construction method is actually implemented, due to the fact that the stand columns exist, construction of the tunnel structure is affected, construction progress is tired, the water stop steel plate needs to be arranged, the procedure is complex, actual operation is inconvenient, the actual waterproof effect of the water stop plate is difficult to guarantee, the stand columns and the tunnel structure have more through nodes, and the tunnel has the potential water leakage hazard.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method of an open-cut and underground-buried tunnel under the condition that a foundation pit is provided with an upright post, solves the problem that the tunnel structure construction is difficult due to the existence of the upright post, avoids the obstruction of the upright post to the tunnel construction under the condition of ensuring the strength of the foundation pit, improves the construction efficiency, ensures the construction quality and reduces the hidden danger of water leakage.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method of an open-cut and buried tunnel under the condition that a foundation pit has an upright column, which comprises the following steps:
s11, constructing an enclosure structure around the area of the tunnel to be constructed, and constructing a plurality of stand columns in the enclosure structure at intervals;
s12, excavating the soil body in the enclosure structure to a set elevation to form a foundation pit, arranging at least two horizontal supports fixedly connected with the stand column on the inner wall of the enclosure structure from top to bottom at intervals along with the excavation depth, and positioning the horizontal support close to the bottom surface of the foundation pit above a tunnel to be constructed;
s13, arranging a plurality of inclined struts between the horizontal supports and the parts corresponding to the stand columns, and cutting off the parts, located between the bottom surface of the foundation pit and the horizontal supports close to the bottom surface of the foundation pit, of the stand columns after the inclined struts reach set strength;
s14, constructing and forming a tunnel between the bottom surface of the foundation pit and the horizontal support close to the bottom surface of the foundation pit, and backfilling soil bodies above the tunnel to fill and level the foundation pit.
The construction method of the open-cut and buried tunnel under the condition that the foundation pit is provided with the stand column is adopted to construct the large-width pavement, the inclined strut is additionally arranged between the adjacent horizontal struts after the horizontal struts are arranged, so that the enclosure structure, the horizontal struts, part of the stand columns among the horizontal struts and the inclined strut jointly form a foundation pit supporting system, the stand column between the bottom surface of the foundation pit and the lowest horizontal strut is cut off, the position of the constructed tunnel is not blocked by the stand column, the problem that the tunnel structure is difficult to construct due to the existence of the stand column is effectively solved, the blocking of the stand column to the tunnel construction is avoided under the condition that the strength of the foundation pit is ensured, the construction efficiency is improved, the construction quality is ensured, and the hidden water leakage danger is reduced.
The construction method of the open-cut and buried tunnel under the condition that the foundation pit is provided with the stand column is further improved in that the construction method further comprises the following steps before the construction of the horizontal support:
and constructing a crown beam at the top of the enclosure structure, and pouring between two opposite crown beams to form a horizontal support.
The construction method of the open-cut and buried tunnel under the condition that the foundation pit is provided with the stand column is further improved in that the construction method further comprises the following steps before the construction of the horizontal support:
and constructing at least one waist beam on the inner wall of the envelope structure, and pouring between the opposite waist beams to form a horizontal support.
The construction method of the open-cut and buried tunnel under the condition that the foundation pit has the stand column is further improved in that the tunnel is formed by a slip form construction mode.
Drawings
Fig. 1 is a flow chart of the construction method of the open-cut buried tunnel under the condition that the foundation pit has the upright post.
Fig. 2 is a schematic diagram of an enclosure structure and an upright post in the construction method of an open-cut and buried tunnel under the condition that the foundation pit has the upright post.
Fig. 3 is a schematic diagram of an embodiment of tunnel formation in the construction method of the open-cut and buried tunnel under the condition that the foundation pit has the stand column.
Fig. 4 is a schematic diagram illustrating another embodiment of tunnel formation in the construction method of the open-cut and buried tunnel in the case of the foundation pit having the column according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a construction method of an open-cut and buried tunnel under the condition that a foundation pit has a stand column, and after horizontal supports are arranged, inclined supports are additionally arranged between adjacent horizontal supports, so that a foundation pit supporting system is formed by a building enclosure structure, the horizontal supports, partial stand columns among the horizontal supports and the inclined supports, and then the stand column between the bottom surface of the foundation pit and the lowest horizontal support is cut off, so that the position of the constructed tunnel is not blocked by the stand column, the problem that the tunnel structure construction is difficult due to the existence of the stand column is effectively solved, the blocking of the stand column to the tunnel construction is avoided under the condition of ensuring the strength of the foundation pit, the construction efficiency is improved, the construction quality is ensured, and the hidden water leakage danger is reduced. The following describes a construction method of an open-cut and buried tunnel under the condition that a foundation pit has an upright column, with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flowchart of a construction method of an open-cut and buried tunnel under the condition that a foundation pit has a column according to the present invention. The following describes a construction method of an open-cut and buried tunnel in the case of a foundation pit having a column, with reference to fig. 1.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the construction method of the open-cut and buried tunnel under the condition that the foundation pit has the column comprises the following steps:
s11, constructing an enclosure structure 11 around the area of the tunnel 16 to be constructed, constructing a plurality of stand columns 12 in the enclosure structure 11 at intervals, and positioning the top surfaces of the enclosure structure 11 and the stand columns 12 below the ground; then, step S12 is executed
Step S12, the soil body in the enclosure structure 11 is dug to a set elevation to form a foundation pit 15, at least two horizontal supports 13 fixedly connected with the upright post 12 are arranged on the inner wall of the enclosure structure 11 from top to bottom at intervals along with the excavation depth, and the horizontal support 13 close to the bottom surface of the foundation pit 15 is positioned above the tunnel 16 to be constructed; then, step S13 is executed
Step S13 is executed, a plurality of inclined struts 14 are arranged between the horizontal supports 13 and the parts corresponding to the upright columns 12, and after the inclined struts 14 reach set strength, the parts, located between the bottom surface of the foundation pit 15 and the horizontal supports 13 close to the bottom surface of the foundation pit 15, of the upright columns 12 are cut off; then, step S14 is executed
And S14, constructing and forming a tunnel 16 between the bottom surface of the foundation pit 15 and the horizontal support 13 close to the bottom surface of the foundation pit 15, and backfilling soil mass above the tunnel 16 to fill and level the foundation pit 15.
As a preferred embodiment of the present invention, before constructing the horizontal support 13, the method further comprises: and constructing a crown beam 111 on the top of the enclosure structure 11, pouring between two opposite crown beams 111 to form a horizontal support, and reinforcing the enclosure structure 11 by the crown beams 111 to form a stable whole.
Specifically, before constructing the horizontal support 13, the method further comprises: at least one wale 112 is constructed on the inner wall of the building envelope 11, and a horizontal support 13 is formed between the opposite wales 112.
Preferably, as shown in fig. 3, the inclined struts 14 may be disposed between two adjacent horizontal struts 13 in a wave shape and correspondingly connected to the vertical column 12; as shown in fig. 4, the inclined strut 14 may be disposed between two adjacent horizontal struts 13 in an X shape and correspondingly connected to the upright 12.
Specifically, the pile foundation 121 is formed at the bottom of the column 12 by casting, and when the column 12 is driven, the pile foundation 121 is driven to a position below the bottom elevation of the tunnel 16 to be formed, so that the pile foundation 121 can bear the load applied to the column 12.
Further, the tunnel 16 is formed by slip-form construction, so that the construction efficiency is high.
The specific embodiment of the invention is as follows:
arranging a building enclosure 11 around an area of a tunnel 16 to be constructed, wherein the building enclosure 11 can be a building enclosure pile and the like, and arranging a plurality of upright posts 12 at intervals in the area surrounded by the building enclosure 11, wherein pile foundations 121 are formed at the bottoms of the upright posts 12, when the upright posts 12 are arranged, the pile foundations 121 are driven into the bottom of the tunnel 16 below an elevation, and at the moment, the tops of the building enclosure 11 and the upright posts 12 are positioned below the ground or are flush with the ground;
excavating a soil body in the enclosure structure 11, arranging horizontal supports 13 at intervals along the excavation depth, when excavating to expose the top of the enclosure structure 11, pouring crown beams 111 on the top of the enclosure structure 11, arranging the horizontal supports 13 between the opposite crown beams 111, pouring waist beams 112 on the inner wall of the enclosure structure 11, and arranging the horizontal supports 13 between the opposite waist beams 112;
continuously excavating the soil body until the soil body is excavated to a set elevation to form a foundation pit 15, arranging an inclined strut 14 between the horizontal strut 13 and the part corresponding to the upright post 12 to disperse stress, planting bars or embedding welding plates at the corresponding position when constructing the inclined strut 14, constructing the inclined strut 14 corresponding to the planted bars or the welding plates, and cutting off the part of the upright post 12 between the bottom surface of the foundation pit 15 and the lowest horizontal strut 13 after the inclined strut 14 reaches the design strength so as to provide for constructing the tunnel 16, wherein the tunnel 16 to be constructed is a communicated space and is not blocked by the upright post 12, so that the tunnel 16 can be formed by adopting a slip-form construction mode, the method has high efficiency and high speed for forming the tunnel 16;
and after the tunnel 16 reaches the set strength, backfilling soil to the top of the tunnel 16 to fill and level the foundation pit 15.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (4)
1. A construction method of an open-cut and buried tunnel under the condition that a foundation pit has an upright column is characterized by comprising the following steps:
s11, constructing an enclosure structure around an area of a tunnel to be constructed, and constructing a plurality of stand columns in the enclosure structure at intervals;
s12, excavating the soil body in the enclosure structure to a set elevation to form a foundation pit, arranging at least two horizontal supports fixedly connected with the stand column on the inner wall of the enclosure structure from top to bottom at intervals along with the excavation depth, and positioning the horizontal support close to the bottom surface of the foundation pit above a tunnel to be constructed;
s13, connecting a plurality of inclined struts between two adjacent horizontal struts, and cutting off the part of the upright column between the bottom surface of the foundation pit and the horizontal strut close to the bottom surface of the foundation pit after the inclined struts reach set strength;
and S14, constructing and forming a tunnel between the bottom surface of the foundation pit and the horizontal support close to the bottom surface of the foundation pit, and backfilling soil body above the tunnel to fill and level the foundation pit.
2. The method for constructing an open-cut and underground-buried tunnel under the condition that the foundation pit has the column according to claim 1, wherein before constructing the horizontal support, the method further comprises:
and constructing a crown beam at the top of the envelope structure, and pouring between the two opposite crown beams to form the horizontal support.
3. The method for constructing an open-cut and underground-buried tunnel under the condition that the foundation pit has the column according to claim 1, wherein before constructing the horizontal support, the method further comprises:
and constructing at least one waist beam on the inner wall of the envelope structure, and pouring between the opposite waist beams to form the horizontal support.
4. The method for constructing an open-cut and underground buried tunnel with a vertical column in a foundation pit according to claim 1, wherein the tunnel is formed by slip-form construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095628.XA CN111287190B (en) | 2020-02-17 | 2020-02-17 | Construction method for open-cut and underground-buried tunnel under condition that foundation pit has stand column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095628.XA CN111287190B (en) | 2020-02-17 | 2020-02-17 | Construction method for open-cut and underground-buried tunnel under condition that foundation pit has stand column |
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| CN111287190A CN111287190A (en) | 2020-06-16 |
| CN111287190B true CN111287190B (en) | 2021-05-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3139546B2 (en) * | 1998-06-17 | 2001-03-05 | 株式会社銭高組 | Mountain retaining structure |
| JP2009084919A (en) * | 2007-10-01 | 2009-04-23 | Kajima Corp | Ground excavating method |
| CN106759367A (en) * | 2017-02-24 | 2017-05-31 | 中铁大桥勘测设计院集团有限公司 | The temporary road laying method of open-cut foundation ditch |
| CN106869172B (en) * | 2017-04-01 | 2019-01-04 | 中交第二航务工程局有限公司 | In-situ deposited prefabricated split-mounting type subway underground station construction method |
| CN108331021A (en) * | 2018-03-22 | 2018-07-27 | 重庆建工第七建筑工程有限责任公司 | Half cap excavation method large span bedding structure of one kind and its construction method |
| CN209227545U (en) * | 2018-10-09 | 2019-08-09 | 中铁二十二局集团轨道工程有限公司 | A kind of open trench tunnel support system |
| CN110080287A (en) * | 2019-04-23 | 2019-08-02 | 中铁第四勘察设计院集团有限公司 | A kind of assembled flat-top has the open cutting construction method of column underground structure |
| CN110130361A (en) * | 2019-05-14 | 2019-08-16 | 广州地铁设计研究院股份有限公司 | It is a kind of for protecting the foundation pit supporting construction and its construction method of subway tunnel structure |
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