CN102704939A - Combined steel temporary supporting excavation method for tunnel with extra-large section - Google Patents

Combined steel temporary supporting excavation method for tunnel with extra-large section Download PDF

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Publication number
CN102704939A
CN102704939A CN2012102124512A CN201210212451A CN102704939A CN 102704939 A CN102704939 A CN 102704939A CN 2012102124512 A CN2012102124512 A CN 2012102124512A CN 201210212451 A CN201210212451 A CN 201210212451A CN 102704939 A CN102704939 A CN 102704939A
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China
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tunnel
shaped steel
excavation
interim
supports
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CN2012102124512A
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Chinese (zh)
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CN102704939B (en
Inventor
张艳涛
阳外光
刘灿
罗明
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中国建筑第五工程局有限公司
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Priority to CN201210212451.2A priority Critical patent/CN102704939B/en
Publication of CN102704939A publication Critical patent/CN102704939A/en
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Abstract

The invention discloses a combined steel temporary supporting excavation method for a tunnel with an extra-large section. The combined steel temporary supporting excavation method comprises the following steps of: firstly excavating and supporting left and right upper pilot tunnels; secondly excavating and supporting left and right middle pilot tunnels, and left and right lower pilot tunnels, and excavating a pilot tunnel on the left lower part of the tunnel section; thirdly, setting temporary mid-partition supports and temporary steel supports for all parts; and finally, dismounting the temporary combined upright post steel supports of the left upper pilot tunnel and the right upper pilot tunnel, and pouring the second liner reinforced concrete, excavating core soil and carrying out inverted arch construction to the middle part of the tunnel. The combined steel temporary supporting excavation method uses a combined steel support to replace a temporary excavation method of the core soil, solves the technical difficulties that the excavation period is long, the construction quality cannot be ensured, the construction is difficult, and the like, and also solves the technical problems of ensuring the quick construction for the super-large section and the construction quality. A steel truss is used to replace the construction for the upper core soil, so that not only the construction safety of the tunnel can be improved, but also the tunnel excavation and the support speed can be quickened.

Description

Extra-large cross-section tunnel combination shaped steel supports the excavation method temporarily
Technical field
The present invention relates to a kind of engineering construction method, particularly a kind of extra-large cross-section tunnel combination shaped steel supports the excavation method temporarily.
Background technology
For the large cross-section tunnel that is positioned at downtown area, city central authorities, shallow buried covered excavation, safe construction is an emphasis.The common excavation method of extra-large cross-section bored tunnel is that branch carries out with big section branch left and right sides sidewall, and extra-large cross-section tunnel excavation job practices is mainly the construction of double side wall pilot tunnel method.This job practices mainly is tunnel excavation to be divided into nine times excavate, the safety when this kind excavation method excavation can guarantee to excavate, but have following deficiency: 1, the excavation operation is many, and working procedure is complicated, and is long in time limit.2, quality is difficult to be guaranteed: because of about two base tunnel holes be difficult to remain on the same straight line when the core soil excavation because of the bow member that separated, seal into ring by core soil, cause the bow member sometimes can't be closed; 3, be unfavorable for the outward transport of slagging tap in tunnel, because of the base tunnel excavated section narrower, vehicle tissue and difficulty thereof.Can't guarantee in view of extra-large cross-section tunnel and Double sidewall pilot tunnel method working procedure steel bow members many, each section are difficult to seal into ring, quality, deficiency such as construction organization difficulty.
Therefore be badly in need of a kind of excavation duration short, construction quality is high and the easy extra-large cross-section tunnel driving method of construction organization.
Summary of the invention
In view of this, technical problem to be solved by this invention provide a kind of excavation duration short, construction quality is high and construction organization is easy to the extra-large cross-section tunnel driving method.
The objective of the invention is to propose a kind of extra-large cross-section tunnel combination shaped steel and support the excavation method temporarily.
The objective of the invention is to realize like this:
Extra-large cross-section provided by the invention tunnel combination shaped steel supports the excavation method temporarily, may further comprise the steps:
The 1st step: upper left pilot drive and supporting, at tunnel cross-section upper left quarter excavation pilot tunnel,, at upper left pilot tunnel interim mid-board supporting is set then until the vault of tunnel cross-section, upper left interim shaped steel is set simultaneously supports;
The 2nd step: upper right pilot drive and supporting, at tunnel cross-section upper right quarter excavation pilot tunnel, until the vault of tunnel cross-section; At upper right pilot tunnel interim mid-board supporting is set then, removes the supporting of interim upper left pilot tunnel mid-board, upper right interim shaped steel is set simultaneously supports;
The 3rd step: pilot drive and supporting in the left side, the excavation pilot tunnel at middle part, a tunnel cross-section left side, pilot tunnel is provided with interim mid-board supporting in a left side then, and interim shaped steel support in the left side is set simultaneously;
The 4th step: pilot drive and supporting in the right side, at tunnel cross-section right middle excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the right side then, and interim shaped steel support in the right side is set simultaneously;
The 5th step: lower-left pilot drive and supporting, at tunnel cross-section lower left quarter excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the lower-left then, the interim shaped steel in lower-left is set simultaneously supports;
The 6th step: bottom right pilot drive and supporting, at tunnel cross-section right lower quadrant excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the bottom right then, the interim shaped steel in bottom right is set simultaneously supports;
The 7th step: the temporary assembly type column steel of removing upper left pilot tunnel and upper right pilot tunnel supports;
The 8th step: two lining steel bar concretes are built;
The 9th goes on foot: core soil excavation, carry out core soil middle part excavation earlier, and behind the soil excavation of completion core middle part, carry out core soil bottom again and excavate;
The 10th step: middle part, tunnel inverted arch construction;
Further, said upper left interim shaped steel supports and comprises that the left side combination shaped steel that supports, is arranged between native top of core and the tunnel vault along the interim shaped steel of the upper left wall of tunnel wall setting supports and be horizontally set at the upper left laterally interim shaped steel support between tunnel wall and the core soil; Said upper right interim shaped steel support comprises along the interim shaped steel support of the upper right wall of tunnel wall setting, is arranged at the upper right combination shaped steel support between core soil top and the tunnel vault and is horizontally set at the upper right laterally shaped steel support temporarily between tunnel wall and the core soil.
Further, interim shaped steel support comprises along the interim shaped steel support of the left mesospore of tunnel wall setting, is arranged at the Zuo Zhonggang support at core soil middle part and is horizontally set at laterally shaped steel support temporarily in the left side between tunnel wall and the core soil in the said left side; Interim shaped steel supports and comprises that supporting, be arranged in the right side at core soil middle part steel along the interim shaped steel of the right mesospore of tunnel wall setting supports and be horizontally set at that laterally interim shaped steel supports in the right side between tunnel wall and the core soil in the said right side.
Further, interim shaped steel supports and comprises and support and be arranged at that steel supports under the left side of core soil bottom along the interim shaped steel of the left lower wall of tunnel wall setting under the said left side; The interim shaped steel in said bottom right supports and comprises the bottom right steel support of supporting and be arranged at core soil bottom along the interim shaped steel of the bottom right wall of tunnel wall setting.
Further, also comprise vertical axis power, supporting stress and the axis force of anchor signal of gathering in the said various steel support.
The invention has the advantages that: the present invention adopts combination shaped steel to support to substitute the interim excavation method of core soil; Solve long in time limit, the technical barriers such as construction quality can't guarantee, construction organization difficulty of excavation, be the rapid construction that realizes extra-large cross-section, the technical problem that construction quality can be able to guarantee.To large section tunnel, utilize steel truss to replace the native one-sided wall construction of top core on top, and auxiliary construction measure and operation.Steel truss replaces the construction of top core soil; Not only can improve the safety of constructing tunnel, and accelerate tunnel excavation and support speed, precondition is provided for carrying out Tunnel Second Lining as early as possible; Obtain remarkable economical and be worth and social effect, had great engineering significance.
The more traditional double side wall pilot tunnel method of this invention has following advantage: 1, construction speed is obviously accelerated; 2, can make the shaped steel of each section support the construction quality of sealing into ring all, guaranteeing the tunnel preliminary bracing, for two linings of constructing as early as possible condition is provided simultaneously; 3, take down core soil as early as possible and help on-the-spot traffic organization and transportation; 4, reduce the consumption of temporary steel support, be beneficial to the saving rolled steel dosage.
In the work progress in whole tunnel; Utilize monitoring means; Collect vertical steel axial force of the supports, preliminary bracing stress, axis force of anchor etc., implement dynamic monitoring, and foundation is provided for the post analysis deal with data for the safety of monitoring the tunnel at any time; Further prioritization scheme provides reference for other similar engineerings simultaneously.
Other advantage of the present invention, target and characteristic will be set forth in manual subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantage can be passed through following manual, claims, and the structure that is particularly pointed out in the accompanying drawing realizes and obtains.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 supports excavation method flow chart for the extra-large cross-section tunnel combination shaped steel that the embodiment of the invention provides temporarily;
The shaped steel braced structures drawing that Fig. 2 provides for the embodiment of the invention;
Fig. 3 supports excavation method sequence of excavation figure for the extra-large cross-section combination shaped steel that the embodiment of the invention provides temporarily;
The vertical support working drawing that Fig. 4 provides for the embodiment of the invention;
Excavation and supporting construction figure that Fig. 5 tops bar for the left pilot tunnel that the embodiment of the invention provides;
The excavation and the supporting construction figure of step in the right pilot tunnel that Fig. 6 provides for the embodiment of the invention;
The interim column steel supporting removal working drawing that Fig. 7 provides for the embodiment of the invention.
Wherein, first steel supports 1, second steel and supports 2, the 3rd steel supports 3, steel bow member 4, channel-section steels support 5.
The specific embodiment
Below will combine accompanying drawing, the preferred embodiments of the present invention will be carried out detailed description; Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
Fig. 1 supports excavation method flow chart for the extra-large cross-section tunnel combination shaped steel that the embodiment of the invention provides temporarily; The shaped steel braced structures drawing that Fig. 2 provides for the embodiment of the invention; Fig. 3 supports excavation method sequence of excavation figure for the extra-large cross-section combination shaped steel that the embodiment of the invention provides temporarily; As shown in the figure: extra-large cross-section provided by the invention tunnel combination shaped steel supports the excavation method temporarily, may further comprise the steps:
At first set up the operating mode of its tunnel excavation through the ansys finite element software; Analyze each the most unfavorable processing condition in the tunnel excavation process, find out maximum stress, for supporting Determination of Parameters; After confirming once more the application of finite element analysis confirm the reasonability of each parameter; Finally determine various vertical steel support, laterally steel support, preliminary bracing parameter that steel truss replaces core soil, arrive optimized design, practice thrift cost.Carry out following steps then:
(1) the left pilot tunnel excavation and the supporting of topping bar
Perform this tunnel top advance anchor bolt before the excavation earlier, perform this place's preliminary bracing and temporary lining behind the excavation immediately
(2) the interim column steel of left pilot tunnel supports
Treat that left pilot tunnel tops bar behind the excavation excavation 3m, begin to perform vertical temporary steel support.
The thick fast hard C25 concrete apart from the wide 10cm of center line 2.5m, is built at formwork erection in first step machinery levelling place;
Second step was completely spread the thick billet of the wide 2cm of 2m on blinding concrete, adopt carrier loader to be transported to the stand place, the auxiliary loading and unloading of crane;
The 3rd step performed first steel and supports 1 for vertically supporting; Vertical support construction drawing as shown in Figure 4; And guarantee vertical; Because of the tunnel excavation height can't be accomplished very precisely; To I-steel upright good after, column is too short can't contact vault the time, the steel plate that adds 400 * 400 * 20mm on the top of I-steel is carved son; Make steel support with the steel bow member between the space closely link to each other, steel plate piece number is decided by on-site actual situations;
The 4th step performed second steel and supports 2 for vertically supporting; And guarantee vertical, because of the tunnel excavation height can't be accomplished very precisely, to i iron upright good after; Column is too short can't contact vault the time; The steel plate that adds 400 * 400 * 20mm on the top of i iron is carved son, make steel support with steel bow member 4 between the space closely link to each other, steel plate piece number is decided by on-site actual situations;
The 5th step performed horizontal connection and bridging (from the bottom to top); First steel supports between 1 and second steel support 2 and supports 5 connections through a plurality of channel-section steels;
The 6th step performed vertical connection and bridging (from the bottom to top).
(3) the right pilot tunnel excavation and the supporting of topping bar
As shown in Figure 5, treat that left and right sides pilot tunnel face staggers behind the 15m, begin the excavation that right pilot tunnel is topped bar, each drilling depth is less than 1m.
The first step is excavated right pilot tunnel and is performed preliminary bracing;
The second step mechanical removal temporary lining 1;
The 3rd step was built the thick fast hard C25 concrete apart from the wide 10cm of center line 2.5m;
The 4th step was completely spread the thick billet of the wide 2cm of 2m on blinding concrete, adopt agricultural vehicle to be transported to the stand place, the auxiliary loading and unloading of crane;
The 5th step performed the 3rd steel and supports 3 for vertically supporting; And guarantee vertical, because of the tunnel excavation height can't be accomplished very precisely, to i iron upright good after; Column is too short can't contact vault the time; The steel plate that adds 400 * 400 * 20mm on the top of i iron is carved son, make steel support with steel bow member 4 between the space closely link to each other, steel plate piece number is decided by on-site actual situations;
The 6th step performed horizontal connection and bridging (from the bottom to top); Second steel supports between 2 and the 3rd steel supports 3 and supports 5 connections through a plurality of channel-section steels;
The 7th step performed vertical connection and bridging (from the bottom to top).
(4) excavation and the supporting of step in the left pilot tunnel
Begin step in the left pilot tunnel excavation can with the left pilot tunnel driving synchronously of topping bar; Each drilling depth is less than 1.2m.
Bench excavation in the pilot tunnel of a first step left side;
The second step sidewall preliminary bracing and central core soil temporary lining and pre-buried junction plate
The 3rd step cross binding 4 is installed;
(5) excavation and the supporting of step in the right pilot tunnel
As shown in Figure 6, treat that step face in the left pilot tunnel begins to perform the excavation and the supporting of step in the right pilot tunnel in the right side behind the step 10m, each drilling depth is less than 1.2m.The practical implementation step is referring to the excavation and the supporting of step in (4) left pilot tunnel.
(6) the left hole excavation and the supporting of getting out of a predicament or an embarrassing situation
When the excavation certain distance of treating step in the left pilot tunnel possessed the excavation of getting out of a predicament or an embarrassing situation condition, beginning was according to excavation and the supporting of getting out of a predicament or an embarrassing situation, and each drilling depth is less than 1.2m.
(7) the right pilot tunnel excavation and the supporting of getting out of a predicament or an embarrassing situation
Begin to perform the excavation and the supporting of step in the right pilot tunnel after treating to get out of a predicament or an embarrassing situation left pilot tunnel face being got out of a predicament or an embarrassing situation 10m apart from the right side, each drilling depth is less than 1.2m.Excavation and supporting that the practical implementation step is got out of a predicament or an embarrassing situation referring to (6) left pilot tunnel.
(8) interim column steel supporting removal
As shown in Figure 7, behind the excavation 10 ~ 15m that treats to get out of a predicament or an embarrassing situation under the right pilot tunnel and tunnel subsidence basicly stable after, the artificial interim column steel of topping bar of removing supports; Each dismounting length and secondary lining are built same length.
The first step is set up high scaffold (adopting three row's scaffolds) at relevant work face according to vertical, horizontal, step pitch 0.6m, artificial vertical bridging and the horizontal bridging removed, and material is transported to the face of land with crane, outside carrier loader is transported to the hole.
The artificial dismounting laterally connected and vertically connected second step, and material is transported to the face of land with crane;
The 3rd step, artificial first steel that supports as interim column steel with the oxygen welding dismounting supported 1 and the 3rd steel support 3; Must strain i iron with crane during dismounting; Preventing that i iron from falling injures operating personnel by a crashing object, final material with the crane handling to the face of land, outside carrier loader is transported to the hole;
The 4th step is artificial removes second steel that supports as interim column steel with oxygen welding and supports 2, must strain i iron with crane during dismounting, prevent that i iron from falling to injure operating personnel by a crashing object, final material with the crane handling to the face of land, outside agricultural vehicle is transported to the hole;
(9) excavation of middle and lower part core soil
After the interim column steel supporting removal of waiting to top bar surpasses 5m, beginning mechanical equivalent of light excavation core soil, the artificial left and right sides pilot tunnel false stull of removing.
Step temporary lining in the first step mechanical removal, step stull in the pilot tunnel of the artificial dismounting left and right sides;
Step in the second step mechanical equivalent of light excavation;
The 3rd step treat in bench excavation begin the mechanical removal temporary lining of getting out of a predicament or an embarrassing situation after accomplishing, artificially remove the stull of getting out of a predicament or an embarrassing situation of left and right sides pilot tunnel;
The 4th step mechanical equivalent of light excavation is got out of a predicament or an embarrassing situation;
The 5th step inverted arch is built and backfill.
(10) left and right sides base tunnel bottom inverted arch is built and secondary lining
(11) gather vertical axis power, supporting stress and the axis force of anchor signal that said various steel supports.
This worker's method has also guaranteed tunnel excavation safety because of replace original core soil through steel truss in accelerating construction progress, be particularly conducive to the demanding regional object of construction production of urban compact area ground settlement.The scope of application: be applicable to the shallow embedding large section tunnel; Be applicable to the large section unsymmetrial loading tunnel; Be applicable to the demanding large section tunnel of ground settlement.
In the work progress in whole tunnel; Utilize monitoring means; Collect vertical steel axial force of the supports, preliminary bracing stress, axis force of anchor etc., implement dynamic monitoring, and foundation is provided for the post analysis deal with data for the safety of monitoring the tunnel at any time; Further prioritization scheme provides reference for other similar engineerings simultaneously.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims (5)

1. combination shaped steel in extra-large cross-section tunnel supports the excavation method temporarily, it is characterized in that: may further comprise the steps:
The 1st step: upper left pilot drive and supporting, at tunnel cross-section upper left quarter excavation pilot tunnel,, at upper left pilot tunnel interim mid-board supporting is set then until the vault of tunnel cross-section, upper left interim shaped steel is set simultaneously supports;
The 2nd step: upper right pilot drive and supporting, at tunnel cross-section upper right quarter excavation pilot tunnel, until the vault of tunnel cross-section; At upper right pilot tunnel interim mid-board supporting is set then, removes the supporting of interim upper left pilot tunnel mid-board, upper right interim shaped steel is set simultaneously supports;
The 3rd step: pilot drive and supporting in the left side, the excavation pilot tunnel at middle part, a tunnel cross-section left side, pilot tunnel is provided with interim mid-board supporting in a left side then, and interim shaped steel support in the left side is set simultaneously;
The 4th step: pilot drive and supporting in the right side, at tunnel cross-section right middle excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the right side then, and interim shaped steel support in the right side is set simultaneously;
The 5th step: lower-left pilot drive and supporting, at tunnel cross-section lower left quarter excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the lower-left then, the interim shaped steel in lower-left is set simultaneously supports;
The 6th step: bottom right pilot drive and supporting, at tunnel cross-section right lower quadrant excavation pilot tunnel, pilot tunnel is provided with interim mid-board supporting in the bottom right then, the interim shaped steel in bottom right is set simultaneously supports;
The 7th step: the temporary assembly type column steel of removing upper left pilot tunnel and upper right pilot tunnel supports;
The 8th step: two lining steel bar concretes are built;
The 9th goes on foot: core soil excavation, carry out core soil middle part excavation earlier, and behind the soil excavation of completion core middle part, carry out core soil bottom again and excavate;
The 10th step: middle part, tunnel inverted arch construction.
2. extra-large cross-section according to claim 1 tunnel combination shaped steel supports the excavation method temporarily, it is characterized in that: said upper left interim shaped steel supports and comprises that the left side combination shaped steel that supports, is arranged between native top of core and the tunnel vault along the interim shaped steel of the upper left wall of tunnel wall setting supports and be horizontally set at the upper left laterally interim shaped steel support between tunnel wall and the core soil; Said upper right interim shaped steel support comprises along the interim shaped steel support of the upper right wall of tunnel wall setting, is arranged at the upper right combination shaped steel support between core soil top and the tunnel vault and is horizontally set at the upper right laterally shaped steel support temporarily between tunnel wall and the core soil.
3. make up shaped steel based on the described extra-large cross-section of claim 2 tunnel and support the excavation method temporarily, it is characterized in that: interim shaped steel support comprises along the interim shaped steel support of the left mesospore of tunnel wall setting, is arranged at the Zuo Zhonggang support at core soil middle part and is horizontally set at laterally shaped steel support temporarily in the left side between tunnel wall and the core soil in the said left side; Interim shaped steel supports and comprises that supporting, be arranged in the right side at core soil middle part steel along the interim shaped steel of the right mesospore of tunnel wall setting supports and be horizontally set at that laterally interim shaped steel supports in the right side between tunnel wall and the core soil in the said right side.
4. combination shaped steel in extra-large cross-section according to claim 3 tunnel supports the excavation method temporarily, it is characterized in that: interim shaped steel supports and comprises and support and be arranged at that steel supports under the left side of core soil bottom along the interim shaped steel of the left lower wall of tunnel wall setting under the said left side; The interim shaped steel in said bottom right supports and comprises the bottom right steel support of supporting and be arranged at core soil bottom along the interim shaped steel of the bottom right wall of tunnel wall setting.
5. extra-large cross-section according to claim 4 tunnel combination shaped steel supports the excavation method temporarily, it is characterized in that: also comprise and gather vertical axis power, supporting stress and the axis force of anchor signal that said various steel supports.
CN201210212451.2A 2012-06-26 2012-06-26 Combined steel temporary supporting excavation method for tunnel with extra-large section CN102704939B (en)

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CN103643958B (en) * 2013-12-13 2016-01-20 中铁二十三局集团有限公司 Hydraulic breaking hammer excavation Modelling of Tunnel Excavation in Soft Rock method
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