CN103362513A - Transformation and construction method for existing cavity in underground excavation region - Google Patents
Transformation and construction method for existing cavity in underground excavation region Download PDFInfo
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- CN103362513A CN103362513A CN2013103218225A CN201310321822A CN103362513A CN 103362513 A CN103362513 A CN 103362513A CN 2013103218225 A CN2013103218225 A CN 2013103218225A CN 201310321822 A CN201310321822 A CN 201310321822A CN 103362513 A CN103362513 A CN 103362513A
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Abstract
The invention discloses a transformation and construction method for an existing cavity in an underground excavation region. The transformation and construction method comprises the steps: detecting an existing tunnel, and determining the expanding excavation construction; determining a boundary line to be broken down according to the measurement result; distributing small duct grouting supports on an arched part, chiseling away the existing tunnel arch wall structure section by section; cutting away reinforcing steel bars of the existing tunnel structure, erecting a steel grating, arranging feet-lock anchor bolts and erecting temporary supports; spraying concrete on the newly erected steel grating; after the arch wall is constructed for 20 meters continuously, removing the temporary supports step by step, removing the inverted arch concrete layer on the existing tunnel at the schedule of less than 2 meters each time, and carrying out inverted arch part initial support to form closing; and finally carrying out waterproof construction, the inverted arch second lining concrete layer and inverted arch filling concrete layer construction, and constructing the arch wall concrete layer by using a template trolley. The transformation and construction method has the advantages that the existing civil air defense space is more effectively used, the excavated volume of earthwork is reduced, the initial supporting reinforcing steel bars are less used, moreover, the construction safety is ensured, the construction period is reduced, and the transformation and construction method is first provided in China.
Description
Technical field
The present invention relates to the transformation of existing tunnel, especially relate to the interval existing hole of a kind of tunneling structural reform and make construction.
Background technology
Be distributed with the civil air defense constructions and installations tunnel in each big and medium-sized cities of China, because these existing people's air defense tunnels have built up for many years, be subjected to the at that time restriction of construction level, not only the structure construction seam is more, the concrete quality discreteness is larger, be subject to easily the erosion of underground water, and the structure also more complicated of situation of country rock behind.In order to alleviate the urban ground traffic tension, promote the development of city integrated traffic, to improve the investment climate, subway tunnel need to be built in many cities.If these existing tunnels are removed and then newly-built subway tunnel, construction risk is very large, and construction cost is also very high.If can utilize existing people's air defense tunneling subway, namely bring into play the passenger traffic benefit of these existing civil air defense constructions and installations, then can save the investment of a large amount of human and material resources and material, greatly reduce earthwork excavated volume, shorten the subway work duration, reduce project cost.But, existing people's air defense tunnel is transformed into subway tunnel, at present temporarily without very ripe job practices.
Summary of the invention
The object of the present invention is to provide the interval existing hole of a kind of tunneling structural reform to make construction, this job practices can solve the construction difficult problem that utilizes existing civil air defense constructions and installations to build subway.
For achieving the above object, the present invention can take following technical proposals:
The interval existing hole of tunneling of the present invention structural reform is made construction, comprises the steps:
Bad soil layer is surveyed and reinforced to the first step to existing tunnel, and measurement existing tunnel cross dimensions is determined one-sided or bilateral digs construction;
Second step according to first step measurement result, according to the actual tunnel requirement, determines to abolish the sideline; The 120 ° of scopes in arch are laid the advanced tubule grouting support, and a minute groove section cuts existing tunnel arch wall structure in 0.5-2 rice scope;
The 3rd step, behind the excision existing tunnel structure reinforcing bars, set up steel grating, set lock foot anchoring stock, set up temporary supporting; Sprayed mortar on the steel grating that newly sets up;
In the 4th step, arch wall is constructed after 20 meters continuously, progressively removes temporary supporting, by progressively abolish existing tunnel inverted arch layer of concrete less than 2 meters progress at every turn, applies the preliminary bracing of inverted arch position, forms and seals; Apply at last waterproof, inverted arch two lining layer of concrete and inverted arch fill concrete layers, with formwork jumbo construction arch wall layer of concrete.
If determine that bilateral digs, owing to need to all abolish existing structure, the steel grid need not to be connected with existing structure, gets final product sprayed mortar after only need to processing, set up according to designing requirement; If determine one-sided digging, the used reinforcing bar length of steel grid is according to as a result setting-out of in-site measurement intercepting, directly is connected with the vault of existing tunnel and inverted arch place, need not to establish junction plate, and main muscle is reserved 30cm and welded with the existing tunnel reinforcing bar, then sprayed mortar.
The described one-sided temporary supporting that digs is for being welded with respectively up and down the i iron that connects batten plate, and top and the bottom connect batten plate and are fixedly connected with existing structure by expansion bolt.The temporary supporting that bilateral digs is for being welded with respectively up and down the i iron that connects batten plate, and top connects batten plate and is fixedly connected with existing structure by expansion bolt, and the bottom connects batten plate and is connected with newly-built inverted arch preliminary bracing by expansion bolt.
The position preliminary bracing of described inverted arch makes itself and abutment wall preliminary bracing and existing tunnel structure form an integral body for the reverse domes place in the existing tunnel bottom sets up then sprayed mortar of steel grating.
If determine one-sided digging, the gap that described inverted arch two lining layer of concrete and existing tunnel do not cut between the structure adopts the concrete identical with inverted arch two lining concrete grades to fill.
The invention has the advantages that construction safety, the duration is short, utilizes existing hole structural reform to cause required tunnel, has reduced earthwork excavated volume, has filled up this technological gap, provides safe and reliable construction technology support for each city utilizes people's air defense tunneling subway tunnel.
Description of drawings
Fig. 1 is construction flow chart of the present invention.
Fig. 2-1, Fig. 2-2, Fig. 2-3, Fig. 2-4, Fig. 2-5, Fig. 2 the-the 6th, the one-sided construction technology figure that digs.
Fig. 3-1, Fig. 3-2, Fig. 3-3, Fig. 3-4, Fig. 3-5, Fig. 3 the-the 6th, the one-sided construction technology figure that digs.
The specific embodiment
Embodiment 1:
Such as Fig. 1, Fig. 2-1---shown in Fig. 2-6, the interval existing hole of tunneling of the present invention structural reform is made construction, comprises the steps:
Bad soil layer is surveyed and reinforced to the first step to existing tunnel structure 1a, measures the cross dimensions of existing tunnel structure 1a, determines the one-sided construction that digs;
Second step according to first step measurement result, according to the actual tunnel requirement, determines to abolish the sideline; The part that the arch need to be abolished is laid advanced tubule 2a grouting support, and the every groove section of existing tunnel arch wall structure 3a(that excavator divides the groove section to cut setting range is no more than 2 meters), shown in Fig. 2-1;
The 3rd step, behind the excision existing tunnel structure reinforcing bars, set up steel grating 4a, set lock foot anchoring stock (2 φ, 42 lock pin anchor tubes, L=3.5 rice), setting up temporary supporting 5a(temporary supporting can with being welded with respectively up and down the i iron that connects batten plate, connect up and down batten plate and be fixedly connected with by the layer of concrete of expansion bolt with the up and down position of existing structure), spacing 1m; Sprayed mortar on the steel grating 4a that newly sets up is seen shown in Fig. 2-2;
In the 4th step, arch wall is constructed after 20 meters continuously, progressively removes temporary supporting 5a; By progressively abolish existing tunnel inverted arch concrete 6a less than the progress of 2m at every turn, see shown in Fig. 2-3; Apply inverted arch position preliminary bracing 7a, form sealing, shown in Fig. 2-4; Apply at last waterproof, apply inverted arch two lining concrete eight a and inverted arch fill concretes, see shown in Fig. 2-5; With formwork jumbo construction arch wall concrete 9a; And do not cut gap between the structure at inverted arch two lining concrete eight a and existing tunnel and fill with inverted arch two and serve as a contrast the identical concrete 10a of concrete grades, shown in Fig. 2-6.
Embodiment 2:
Such as Fig. 1, Fig. 3-1---shown in Fig. 3-6, the interval existing hole of tunneling of the present invention structural reform is made construction, comprises the steps:
Bad soil layer is surveyed and reinforced to the first step to the existing tunnel structure, measures the cross dimensions of existing tunnel structure, determines that bilateral digs construction;
Second step according to first step measurement result, according to the actual tunnel requirement, determines to abolish the sideline; The 120 ° of scopes in arch are laid advanced tubule 1b grouting support, and the every groove section of existing tunnel arch wall structure 2b(that excavator divides the groove section to cut setting range is no more than 1m), shown in Fig. 3-1;
The 3rd step, behind the excision existing tunnel structure reinforcing bars, set up steel grating 3b, set lock foot anchoring stock (2 φ, 42 lock pin anchor tubes, L=3.5 rice), setting up temporary supporting 4b(temporary supporting can with being welded with respectively up and down the i iron that connects batten plate, connect up and down batten plate and be fixedly connected with by the layer of concrete of expansion bolt with newly-built steel grating 3b and existing structure), 1 meter of spacing; Sprayed mortar on steel grating 3b is shown in Fig. 3-2;
In the 4th step, arch wall is constructed after 20 meters continuously, progressively removes temporary supporting, by progressively abolish existing tunnel inverted arch layer of concrete 5b less than 2 meters progress at every turn, sees Fig. 3-3, applies inverted arch position preliminary bracing 6b, forms and seals, and sees Fig. 3-4; Apply at last waterproof, inverted arch two lining concrete seven b and inverted arch fill concretes, see Fig. 3-5; With formwork jumbo construction arch wall concrete eight b, such as Fig. 3-6.
Claims (5)
1. the interval existing hole of a tunneling structural reform is made construction, it is characterized in that: comprise the steps:
Bad soil layer is surveyed and reinforced to the first step to existing tunnel, and measurement existing tunnel cross dimensions is determined one-sided or bilateral digs construction;
Second step according to first step measurement result, according to the actual tunnel requirement, determines to abolish the sideline; The 120 ° of scopes in arch are laid the advanced tubule grouting support, and a minute groove section cuts existing tunnel arch wall structure in 0.5-2 rice scope;
The 3rd step, behind the excision existing tunnel structure reinforcing bars, set up steel grating, set lock foot anchoring stock, set up temporary supporting; Sprayed mortar on the steel grating that newly sets up;
In the 4th step, arch wall is constructed after 20 meters continuously, progressively removes temporary supporting, by progressively abolish existing tunnel inverted arch layer of concrete less than 2 meters progress at every turn, applies the preliminary bracing of inverted arch position, forms and seals; Apply at last waterproof, inverted arch two lining layer of concrete and inverted arch fill concrete layers, with formwork jumbo construction arch wall layer of concrete.
2. the interval existing hole of tunneling according to claim 1 structural reform is made construction, it is characterized in that: if determine that bilateral digs, owing to need to all abolish existing structure, the steel grid need not to be connected with existing structure, gets final product sprayed mortar after only need to processing, set up according to designing requirement; If determine one-sided digging, the used reinforcing bar length of steel grid intercepts according to as a result setting-out of in-site measurement, is connected main muscle and the welding of existing tunnel reinforcing bar, then sprayed mortar with the inverted arch place with the vault of existing tunnel.
3. the interval existing hole of tunneling according to claim 1 structural reform is made construction, it is characterized in that: the described one-sided temporary supporting that digs is for being welded with respectively up and down the i iron that connects batten plate, top and the bottom connect batten plate and are fixedly connected with existing structure by expansion bolt, the temporary supporting that bilateral digs is for being welded with respectively up and down the i iron that connects batten plate, top connects batten plate and is fixedly connected with existing structure by expansion bolt, and the bottom connects batten plate and is connected with newly-built inverted arch preliminary bracing by expansion bolt.
4. the interval existing hole of tunneling according to claim 1 structural reform is made construction, it is characterized in that: the position preliminary bracing of described inverted arch makes itself and abutment wall preliminary bracing and existing tunnel structure form an integral body for the reverse domes place in the existing tunnel bottom sets up then sprayed mortar of steel grating.
5. the interval existing hole of tunneling according to claim 1 structural reform is made construction, it is characterized in that: if determine one-sided digging, the gap that described inverted arch two lining layer of concrete and existing tunnel do not cut between the structure adopts the concrete identical with inverted arch two lining concrete grades to fill.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628886A (en) * | 2013-11-28 | 2014-03-12 | 中铁十三局集团有限公司 | Method for excavating weak surrounding rock tunnel under water-rich high-ground-stress conditions |
| CN104100278A (en) * | 2014-07-08 | 2014-10-15 | 中铁十六局集团第五工程有限公司 | Construction method for demolishing original arch frames and primarily supporting windings of transition sections of tunnels |
| CN104329095A (en) * | 2014-09-03 | 2015-02-04 | 福州市规划设计研究院 | Construction method for widening existing tunnel |
| CN104653228A (en) * | 2015-01-20 | 2015-05-27 | 卢春林 | Shallow underground excavation tunnel temporary support detaching equipment and method |
| CN104695479A (en) * | 2015-01-14 | 2015-06-10 | 中铁第四勘察设计院集团有限公司 | Construction method of connecting channel of civil basement and subway |
| CN105003272A (en) * | 2015-07-26 | 2015-10-28 | 北京工业大学 | Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways |
| CN105587324A (en) * | 2015-12-29 | 2016-05-18 | 中铁五局集团有限公司 | Construction method for expanding excavation of steel grid support section at tunnel entrance |
| CN105781573A (en) * | 2016-03-18 | 2016-07-20 | 中铁九局集团第六工程有限公司 | Railway down-traversing highway tunnel double-layer casing pipe reinforcement double-pipe shed follow-pipe drilling construction method |
| CN106567717A (en) * | 2015-10-10 | 2017-04-19 | 中铁隧道勘测设计院有限公司 | Construction oblique channel structure utilizing subway exit and entrance and construction method |
| CN107654239A (en) * | 2017-09-20 | 2018-02-02 | 中铁十四局集团有限公司 | A kind of tunnel bottom is excavated and inverted arch construction method |
| CN110145328A (en) * | 2019-05-24 | 2019-08-20 | 中铁隧道局集团有限公司 | A kind of subway tunnel is from vertical shaft into the construction method of mining sectbn portal |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628886A (en) * | 2013-11-28 | 2014-03-12 | 中铁十三局集团有限公司 | Method for excavating weak surrounding rock tunnel under water-rich high-ground-stress conditions |
| CN104100278A (en) * | 2014-07-08 | 2014-10-15 | 中铁十六局集团第五工程有限公司 | Construction method for demolishing original arch frames and primarily supporting windings of transition sections of tunnels |
| CN104329095A (en) * | 2014-09-03 | 2015-02-04 | 福州市规划设计研究院 | Construction method for widening existing tunnel |
| CN104695479A (en) * | 2015-01-14 | 2015-06-10 | 中铁第四勘察设计院集团有限公司 | Construction method of connecting channel of civil basement and subway |
| CN104653228A (en) * | 2015-01-20 | 2015-05-27 | 卢春林 | Shallow underground excavation tunnel temporary support detaching equipment and method |
| CN105003272A (en) * | 2015-07-26 | 2015-10-28 | 北京工业大学 | Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways |
| CN106567717A (en) * | 2015-10-10 | 2017-04-19 | 中铁隧道勘测设计院有限公司 | Construction oblique channel structure utilizing subway exit and entrance and construction method |
| CN106567717B (en) * | 2015-10-10 | 2019-03-05 | 中铁第六勘察设计院集团有限公司 | It is a kind of to double as construction access ramp structure and construction method using subway entrance |
| CN105587324A (en) * | 2015-12-29 | 2016-05-18 | 中铁五局集团有限公司 | Construction method for expanding excavation of steel grid support section at tunnel entrance |
| CN105587324B (en) * | 2015-12-29 | 2017-11-24 | 中铁五局集团有限公司 | Dig the construction method of tunnel portal section supporting steel grating section |
| CN105781573B (en) * | 2016-03-18 | 2019-03-01 | 中铁九局集团第六工程有限公司 | The two-tube canopy pipe-following drilling construction method of vcehicular tunnel bilayer sleeve reinforcement is worn under railway |
| CN105781573A (en) * | 2016-03-18 | 2016-07-20 | 中铁九局集团第六工程有限公司 | Railway down-traversing highway tunnel double-layer casing pipe reinforcement double-pipe shed follow-pipe drilling construction method |
| CN107654239A (en) * | 2017-09-20 | 2018-02-02 | 中铁十四局集团有限公司 | A kind of tunnel bottom is excavated and inverted arch construction method |
| CN110145328A (en) * | 2019-05-24 | 2019-08-20 | 中铁隧道局集团有限公司 | A kind of subway tunnel is from vertical shaft into the construction method of mining sectbn portal |
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Application publication date: 20131023 |