CN101487394A - External slip-casting pipe type tunnel shielding portal construction method - Google Patents

External slip-casting pipe type tunnel shielding portal construction method Download PDF

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Publication number
CN101487394A
CN101487394A CNA2009100737708A CN200910073770A CN101487394A CN 101487394 A CN101487394 A CN 101487394A CN A2009100737708 A CNA2009100737708 A CN A2009100737708A CN 200910073770 A CN200910073770 A CN 200910073770A CN 101487394 A CN101487394 A CN 101487394A
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CN
China
Prior art keywords
tunnel
construction
portal
shield
external
Prior art date
Application number
CNA2009100737708A
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Chinese (zh)
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CN101487394B (en
Inventor
辛振省
程文斌
郑保才
胡国伟
Original Assignee
中铁三局集团有限公司
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Priority to CN2009100737708A priority Critical patent/CN101487394B/en
Publication of CN101487394A publication Critical patent/CN101487394A/en
Application granted granted Critical
Publication of CN101487394B publication Critical patent/CN101487394B/en

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Abstract

The invention belongs to the technical field of tunnel portals during the starting and receiving of tunnel shields in subway tunnel construction, more particularly relates to an external grouting pipe type tunnel shield tunnel portal construction method, solving the problems of long construction period, high construction cost, even starting failure and the like which are caused by adopting the method of enlarging the tunnel portal for the starting and receiving of the existing external grouting pipe type tunnel shield. In the external grouting pipe type tunnel shield tunnel portal construction method, the tunnel portal thereof is provided with a groove corresponding to an external injection pipe. The construction method has the following beneficial effects: on the one hand, cost and construction period for enlarging the tunnel portal are saved; on the other hand, the dangers of water spray and sand gushing of the tunnel portal are greatly lowered; in addition, the external grouting tunnel shield can be expanded with a large area, thus indirectly saving synchronous grouting amount, reducing stratum disturbance and ground settlement, and guaranteeing the safe and quick construction of tunnel shield tunnel construction.

Description

External slip-casting pipe type tunnel shielding portal construction method
Technical field
The invention belongs to the technical field of portal when shield launching is with reception in the Metro Tunnel, be specifically related to a kind of external slip-casting pipe type tunnel shielding portal construction method.
Background technology
Shield machine is applied in the metro construction more and more widely as soft soil tunnel excavation facility, and shield construction method occupies leading position with plurality of advantages such as its mechanization degree height, labour intensity are low, safe and efficient in the subway work field.
During the shield machine excavation, the cutter diameter of the forefront cutting soil body is larger than the good pipe-plate lining of shield structure afterbody assembly unit, has just formed the space of excavation space and section of jurisdiction external diameter thus.This part space will be leaned on synchronous grouting equipment (Grouting Pipe) injection cement paste to wait in time and fill, to reduce formation displacement or the sedimentation that the stratum loss brings, in shield-tunneling construction, the backfill grouting of section of jurisdiction is one critical process, and it is all significant to the aspects such as water resistance in controlling ground settlement, constraint section of jurisdiction displacement and enhancing tunnel.
With regard to present shield machine, the shield grouting pipe be furnished with three kinds of modes: 1. Grouting Pipe is built-in; 2. Grouting Pipe external; 3. Grouting Pipe intermediate arrangement formula.Grouting Pipe is built-in can effectively protect Grouting Pipe with Grouting Pipe intermediate arrangement formula dual mode, prevents that Grouting Pipe from being galled.But its amount of backbreaking is bigger, needs the slurries of backfill more, and expense is higher.The external Grouting Pipe amount of backbreaking is little, but it is positioned at shield structure outermost, and shield structure original positive circle has just become the shape that a circle adds four projectioies like this, as shown in Figure 1 and Figure 2.And the portal that starts and accept of shield structure is circle, at present, is the mode of taking to enlarge portal and allows the shield structure that has four projections pass in and out portal, as shown in Figure 3.
Enlarge the scheme of portal, not only Shi Gong cycle long, the operating expenses height the most important thing is, after portal strengthens, in the process that starts and accept, the space between portal and shield structure shell is strengthened, in the higher area of water table ratio, be easy to cause gushing water to emit sand, by rubber cord and flap is to be difficult to block a large amount of water sand, causes the failure of starting most probably, ground catastrophic effect such as cave in.
Summary of the invention
The present invention causes long construction period, operating expenses height in order to solve existing external grouting tube type shield and to adopt the mode that enlarges portal to start and accepting, even problem such as the failure of starting, and a kind of external grouting tube type shield groove type portal job practices is provided.
The present invention adopts following technical scheme to realize:
External slip-casting pipe type tunnel shielding portal construction method, its described portal are provided with and external grouting pipe corresponding groove.
External slip-casting pipe type tunnel shielding portal construction method, its step is as follows:
1), does diaphragm wall or maintenance stake, excavation pit;
2), according to shield structure external grouting pipe machined grooves formula steel ring;
3), bury the groove type steel ring underground, assembling reinforcement, cast station interior wall;
4), lifting shield structure and installation in position, and rubber cord and fan-shaped flap are installed in the eyebrow Board position and the groove location of portal steel ring;
5), cut diaphragm wall or safeguard stake according to the groove type steel ring.
The present invention mainly carries out reasonable portal design and construction according to the shape of external grouting shield structure, compares with the existing method that enlarges portal, and the present invention has following beneficial effect: save expense and the duration that portal enlarges on the one hand; On the other hand, greatly reduce the portal water spray and gush husky danger; In addition, can also make external grouting shield structure be able to large tracts of land and promote that indirect saving synchronous grouting amount reduces ground disturbance and surface settlement, guarantees the construction safely and fast of shield tunnel project.
Description of drawings
Fig. 1 is the axle side schematic diagram of shield structure
Fig. 2 is the schematic cross-sectional view of shield structure
Fig. 3 is the schematic diagram that the shield structure passes through the portal of increasing in the prior art
Fig. 4 is the schematic diagram of groove type portal
Fig. 5 is the schematic diagram of external grouting tube type shield machine by the groove type portal
Among the figure: the 1-shield machine, 2-external grouting pipe, the portal that 3-strengthens, 4-starts, acceptance frame, 5-groove type portal
The specific embodiment
In conjunction with the accompanying drawings the specific embodiment of the present invention is described further.
The shape that The present invention be directed to four external grouting pipe evaginations of the shield structure shape of portal of designing and constructing, portal is provided with and external grouting pipe corresponding groove.
Concrete steps are as follows:
1, before the excavation of foundation pit, does diaphragm wall or safeguard stake, excavation pit then;
2, at groove shapes processing portal steel ring shape;
3, bury the groove type steel ring that processes underground, assembling reinforcement, cast station interior wall;
4, lift shield structure and installation in position, and rubber cord and fan-shaped flap are installed in the eyebrow Board position and the groove location of portal steel ring;
5, cut diaphragm wall, and in shield structure external grouting pipe position and groove portal correspondence position with facility such as pneumatic picks space enclosing structure is dug out respective slot, groove size is more bigger than shield structure external grouting pipe size, in order to avoid wrong card pipe when poor of calibration size.
6, the shield structure has been proofreaded groove and external grouting pipe position, and driving starts.
Job practices of the present invention has been dwindled the space between portal and shield body greatly, has effectively stoped gushing of artesian water, and in the higher area of underground pressure water head, the probability that silt is gushed drops to minimum in the time of especially.If with the existing method that enlarges portal, the accident that silt is gushed very easily takes place, and gently then causes the failure of starting, and secondary to start; Heavy then station is flooded and is caved in, and change circuit.The expense that secondary starts generally between 2,000,000 yuan~1,000 ten thousand yuan, is caved in if cause the station to flood, and expense is between 5,000 ten thousand yuan~1.5 hundred million yuan.So the present invention can not wait at 2,000,000 yuan~1.5 hundred million yuan the direct or indirect economic benefit that specific engineering produces.
The present invention can make the application of external grouting tube type shield promote greatly, saves the slip casting of super excavation and calculates with usual 5.4m diameter tunnel, can save 2.44m 3/ m.

Claims (2)

1, a kind of external slip-casting pipe type tunnel shielding portal construction method is characterized in that described portal is provided with and external grouting pipe corresponding groove.
2, external slip-casting pipe type tunnel shielding portal construction method according to claim 1 is characterized in that step is as follows:
1), does diaphragm wall or maintenance stake, excavation pit;
2), according to shield structure external grouting pipe machined grooves formula steel ring;
3), bury the groove type steel ring underground, assembling reinforcement, cast station interior wall;
4), lifting shield structure and installation in position, and rubber cord and fan-shaped flap are installed in the eyebrow Board position and the groove location of portal steel ring;
5), cut diaphragm wall or safeguard stake according to the groove type steel ring.
CN2009100737708A 2009-02-11 2009-02-11 External slip-casting pipe type tunnel shielding portal construction method CN101487394B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009100737708A CN101487394B (en) 2009-02-11 2009-02-11 External slip-casting pipe type tunnel shielding portal construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009100737708A CN101487394B (en) 2009-02-11 2009-02-11 External slip-casting pipe type tunnel shielding portal construction method

Publications (2)

Publication Number Publication Date
CN101487394A true CN101487394A (en) 2009-07-22
CN101487394B CN101487394B (en) 2010-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009100737708A CN101487394B (en) 2009-02-11 2009-02-11 External slip-casting pipe type tunnel shielding portal construction method

Country Status (1)

Country Link
CN (1) CN101487394B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102022119A (en) * 2010-12-15 2011-04-20 广东华隧建设股份有限公司 Shield machine balance originating method
CN103397892A (en) * 2013-07-15 2013-11-20 中铁十三局集团有限公司 Shield starting tunnel portal extension steel ring
CN108643933A (en) * 2018-04-27 2018-10-12 中铁十二局集团有限公司 Shield receives portal reinforcement means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102022119A (en) * 2010-12-15 2011-04-20 广东华隧建设股份有限公司 Shield machine balance originating method
CN102022119B (en) * 2010-12-15 2012-09-05 广东华隧建设股份有限公司 Shield machine balance originating method
CN103397892A (en) * 2013-07-15 2013-11-20 中铁十三局集团有限公司 Shield starting tunnel portal extension steel ring
CN108643933A (en) * 2018-04-27 2018-10-12 中铁十二局集团有限公司 Shield receives portal reinforcement means

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Publication number Publication date
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