CN106761778A - A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground - Google Patents

A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground Download PDF

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Publication number
CN106761778A
CN106761778A CN201710054139.8A CN201710054139A CN106761778A CN 106761778 A CN106761778 A CN 106761778A CN 201710054139 A CN201710054139 A CN 201710054139A CN 106761778 A CN106761778 A CN 106761778A
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China
Prior art keywords
arch
station
bow
excavated
construction technology
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CN201710054139.8A
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Chinese (zh)
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CN106761778B (en
Inventor
刘人太
张世杰
李克先
白继文
李夏
桂大壮
姜其琛
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山东大学
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Publication of CN106761778A publication Critical patent/CN106761778A/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete

Abstract

The invention discloses a kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground, comprise the following steps:Excavate and supporting station arch:First excavate at both sides spandrel and arch springing, then from top to bottom excavate the middle part remainder in the portion, and apply arch preliminary bracing and bow member;Station main body is excavated:After station main part is excavated using three benching tunnelling methods after the stabilization of station arch, every grade of step first excavates two side portions, and in tunnel side, wall applies its support reinforcement, then the middle part remainder for excavating the portion;Secondary lining is applied and supporting:After the completion of station arch and main body are all excavated, carry out secondary lining and apply.Station construction technique of the invention is without pilot tunnel, operation is few, waterproof quality is good, difficulty of construction is small, abandoned project is small, integrate it is efficient with it is economical.To the great applicability of upper-soft lower-hard ground, preliminary bracing adds the composite supporting construction of bow member can to ensure the safety of top arch, takes full advantage of the bearing capacity of bottom hard rock, reduces unnecessary supporting.

Description

A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground

Technical field

The invention belongs to Geotechnical Engineering field, and in particular to a kind of underground digging in subway station suitable for upper-soft lower-hard ground is applied Work technique.

Background technology

With the raising of Urban Rail Transit density, positioned at city busy section of town large span tunneling subway station by Cumulative many, this class engineering has the features such as buried depth is shallow, section is big, construction risk is big, the construction period is long, construction costs is high.

The technology and engineering method of subway station shallow buried covered excavation are a lot, but for upper soft lower hard this special formation, all methods of multiplexing Because supporting intensity is too high or relatively low without tool applicability.Conventional engineering method mainly has two side-wall pilot tunnel and ledge method at present.It is double Side heading method excavated section piecemeal is more, each self-closing immediately after excavation of each piecemeal, can preferably be controlled in construction System deformation, it is ensured that excavate safety.But its disjunction face causes operation to increase, the time of initial support tunneling boring closure is long, the duration Extension, and in upper-soft lower-hard ground, bottom rock blasting operation influences larger to gib system;Ledge method is in cavern-pile method On the basis of set up the engineering method suitable for upper-soft lower-hard ground, its ledge part excavate after the completion of apply secondary lining immediately, Excavation and support crossed construction, had both caused human and material resources waste, substantially prolongs the duration again, and due between arch wall not It is evitable to leave construction joint, and without effective waterproof measure, cause its big arch springing position percolating water serious and be difficult to administer, seriously Safety during influence station excavation and operation.

The content of the invention

The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of ground suitable for upper-soft lower-hard ground Iron station boring construction technique, plays an important role for reducing construction risk, shortening construction period, saving construction costs etc., is Ensure the key that engineering is smoothly implemented.The present invention is, with upper-soft lower-hard ground tunneling subway station as engineering background, to be encircleed with tradition Based on lid method study and invent, effectively avoid the shortcoming of the engineering method such as two side-wall pilot tunnel and ledge method, for it is upper it is soft under Hard formation tunneling subway station excavation and support provides a kind of new approaches.

To achieve the above object, the present invention uses following technical proposals:

A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground, comprises the following steps:

Step 1:Excavate and supporting station arch:First excavate at both sides spandrel and arch springing, then from top to bottom excavate the portion Middle part remainder, and apply arch preliminary bracing and bow member;

Step 2:Station main body is excavated:After station arch is stable station main part, every grade are excavated using three benching tunnelling methods Step first excavates two side portions, and in tunnel side, wall applies its support reinforcement, then the middle part remainder for excavating the portion;

Step 3:Secondary lining is applied and supporting:After the completion of station arch and main body are all excavated, arch and station are carried out The secondary lining of main body is applied;Arch secondary lining is applied with bow member dismounting alternately, secondary to avoid construction crack from producing Lining cutting mould builds disposable closing cyclization.

Further, in the step 1, stratum residing for the arch of station is soft stratum (the generally the 4th is topsoil), The disturbance to stratum should be reduced in digging process, therefore station arch is excavated using artificial mechanism, explosion is not carried out or is carried out weak quick-fried It is broken.

Further, in the step 1, in the digging process of station arch, the corresponding stratum of a Pin have often been excavated and has been applied immediately Make grid steel frame, and m esh-hanging sprayed concrete carries out arch preliminary bracing, and bow member is applied after the completion of the preliminary bracing of arch, bow member is sat Fall within prefabricated bearing.

Further, in the step 1, along station contour line before the corresponding stratum of the every Pin in arch are excavated AT STATION Row's advanced tubule is laid, for the pre-reinforcement of soft stratum, advanced curtain-grouting, water can be used when country rock situation is poor Flat rotary churning pile mode is reinforced to country rock and face.

Further, in the step 1, shaped steel arch is close to arch preliminary bracing and is set, and every two product Pin spacing 30~ 70cm, determines with specific reference to country rock situation, stratum settlement requirement, ground structures and line conditions etc..

Further, in the step 1, for ease of installing, three sections of settings of bow member point pass through ring flange between three sections of bow members Connection, bow member is connected with bearing by connector.

Further, in the step 1, bearing is poured by armored concrete and formed along the axially consecutive setting in station, bearing. The multiple bow members set in tunnel can be conveniently supported on, it is continuous that the more convenient constructing operation of bearing is set, also bow member is played more Good support effect.

Further, anchor pole is oliquely downward applied by bearing after the completion of arch springing excavation, then carries out bearing and pour, anchor Bar end is integral with bar connecting in bearing, the prefabricated connector being connected with bow member of upper surface of support.To being added at bearing Clamped shield, and directly anchor pole is integrated with bearing bar connecting, make the stability of bearing more excellent, it is ensured that whole supporting construction Steadiness.

Further, in the step 2, station main body excavates position and excavates position 50~100m of spacing with station arch, Every grade of 7~9m of step spacing.Dividing bench excavation can realize that multiple sections are constructed simultaneously, influence each other small, improve efficiency.

Further, in the step 2, the method for its support reinforcement is:In tunnel side, wall oliquely downward applies anchor pole, and right Tunnel side wall carries out shotcrete with mesh treatment.

The beneficial effects of the invention are as follows:

(1) station construction technique of the invention without pilot tunnel, operation is few, waterproof quality is good, difficulty of construction is small, abandoned project It is small, integrate it is efficient with it is economical.

(2) to the great applicability of upper-soft lower-hard ground, preliminary bracing adds shaped steel arch to station construction technique of the invention Composite supporting construction can ensure the safety of top arch, while taking full advantage of the bearing capacity of bottom hard rock, reducing need not The supporting wanted.

(3) compared with ledge method, the disposable mould of secondary lining builds up ring to station construction technique of the invention, it is to avoid arch wall Between construction joint generation, while avoid excavation with secondary lining apply crossed construction, use manpower and material resources sparingly, shorten work Phase;

(4) station construction technique of the invention is compared to two side-wall pilot tunnel, it is not necessary to which disjunction surface construction, operation is few, and After ledge is formed, you can large area operation, efficiency high, the duration shortens;

(5) station construction technique of the invention supporting is simple, is easy to operation, and shaped steel arch is repeatable to be utilized, cost-effective, Increase the benefit.

Brief description of the drawings

Fig. 1 is that construction technology of the present invention excavates schematic diagram;

Fig. 2 is excavation face generalized section;

In figure, 1 is bow member;2 is arch preliminary bracing;3 is anchor pole;4 is secondary lining;5 is bow member bearing;6 is arch Face;7 is first step face;8 is second step face;9 is the 3rd step face;10 is excavation contour line; 11 is advanced tubule;12 is station main body preliminary bracing;1. it is spandrel arch feet point, is 2. middle part vault part, 3. in Portion arch bottom point, is 4. first order step sidepiece, is 5. first order step middle part, is 6. second level step sidepiece, is 7. second Level step middle part, is 8. third level step sidepiece, is 9. third level step middle part.

Specific embodiment

The present invention is further described with reference to the accompanying drawings and examples.

As shown in figure 1, a kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground, station arch in this technique Portion is located in soft stratum, and arch springing is seated on hard rock, and station agent structure is located among hard rock;Upper-soft lower-hard ground is referred to Superstratum is soft stratum, and understratum is hardpan.Soft stratum refers to ground of the saturation uniaxial strengeth less than 30MPa Layer, including layer of sand, soil layer, muck soil, severely-weathered and completely decomposed rock stratum etc., it is big that hardpan refers to saturation uniaxial strengeth It is main including gentle breeze or unweathered rock stratum (granite, andesite etc.) in the stratum of 30MPa.

Its excavation and support processes is comprised the following steps:

(1) station arch is excavated and supporting:Station arch is excavated using artificial mechanism, explosion is not carried out or is carried out weak quick-fried Broken, first 1. excavation both sides spandrel arch feet divides, then from top to bottom 3. 2. excavation middle part vault part divided with middle part arch bottom, excavation During carry out arch preliminary bracing 2 in time, often excavated a Pin and applied grid steel frame, and m esh-hanging sprayed concrete immediately, encircle Bow member 1 is applied after the completion of portion's preliminary bracing 2, bow member 1 may be selected as shaped steel arch.In tunnel construction, Pin is measure word, for weighing The quantity of bracing members in constructing tunnel.

(2) station main body is excavated:Excavated using three benching tunnelling methods again after vault is partially stabilized, first order step first excavates a left side 5. 4. the first order step sidepiece of right both sides, then excavate first order step middle part, and second level step first excavates the of the left and right sides 7. 6. two stage steps sidepiece, then excavate second level step middle part, and third level step first excavates the third level step side of the left and right sides 8., then excavate third level step middle part 9. in portion;After every grade of complete lateral parts of bench excavation, anchor pole 3 is oliquely downward applied, to side Shotcrete with mesh is carried out, after carrying out station main body preliminary bracing 12, then every grade of center section of step is excavated.

(3) secondary lining is applied and supporting:After the completion of station arch and main body are all excavated, arch and station main body are carried out Secondary lining 4 apply.Secondary lining 4 needs to remove shaped steel arch 1 before applying, and each mould of secondary lining builds length by formwork jumbo Size determine, generally 6~15m, shaped steel arch 1 remove with the mould of secondary lining 4 build alternately (remove a Pin shaped steel archs 1, A Pin secondary linings 4 are applied, then remove next Pin shaped steel archs 1, apply next Pin secondary linings 4, continued alternately), often Secondary dismounting length builds length equal to mould.To avoid construction crack from producing, secondary lining mould builds disposable closing cyclization.

Step (1) (2) uses disjunction surface construction, the construction as shown in Fig. 2 face staggers, arch face 6 and First Rank face is before and after 50~100m, first step face 7, second step face 8, the 3rd step face 9 at a distance of 7 ~9m.

Forward position tunnel excavation contour line 10 in step (1) per Pin excavations sets row's advanced tubule 11, for flabbily The pre-reinforcement of layer, the length of advanced tubule 11 is about 1~3m, if country rock situation can use advanced curtain-grouting, level when poor The modes such as rotary churning pile are reinforced to country rock and face.

Drilling depth is excavated in step (1) every time depending on country rock situation, each drilling depth 50cm or 75cm may be selected.

Step (1) middle arch rack 1 is close to arch preliminary bracing 2, and every two Pin, the 30~70cm of spacing of bow member 1, the material of bow member 1 is used I-steel, three sections of bow member 1 point is connected between section and section by ring flange, and the bottom of bow member 1 is provided with bow member bearing 5, bow member bearing 5 It is axially consecutive along tunnel, poured by armored concrete and formed, bow member bearing 5 is bolted with bow member 1.Bow member bearing 5 exists Arch springing oliquely downward applies anchor pole 3 after the completion of excavating, and then carries out bearing and pours, and surface is prefabricated thereon is connected with bow member 1 Bolt.

Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.

Claims (10)

1. a kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground, it is characterized in that, comprise the following steps:
Step 1:Excavate and supporting station arch:First excavate at both sides spandrel and arch springing, then the middle part for from top to bottom excavating the portion Remainder, and apply arch preliminary bracing and bow member;
Step 2:Station main body is excavated:After station arch is stable station main part, every grade of step are excavated using three benching tunnelling methods Two side portions are first excavated, wall applies its support reinforcement, then the middle part remainder for excavating the portion in tunnel side;
Step 3:Secondary lining is applied and supporting:After the completion of station arch and main body are all excavated, the two of arch and tunnel are carried out Secondary lining cutting is applied;Carry out when arch secondary lining is applied with bow member dismounting alternately, secondary lining mould is built and disposably closed into Ring.
2. underground digging in subway station construction technology as claimed in claim 1, it is characterized in that, in the step 1, station arch uses Artificial mechanism is excavated, and explosion is not carried out or weak blast is carried out.
3. underground digging in subway station construction technology as claimed in claim 1, it is characterized in that, in the step 1, station arch is excavated During, often excavate the corresponding stratum of a Pin and apply grid steel frame immediately, and m esh-hanging sprayed concrete carries out arch initial stage branch Shield, applies bow member after the completion of the preliminary bracing of arch, bow member is seated on prefabricated bearing.
4. the underground digging in subway station construction technology as described in claim 1 or 3, it is characterized in that, in the step 1, encircle AT STATION The every Pin in portion lays row's advanced tubule before excavating on corresponding stratum along tunnel contour line, can when country rock situation is poor Country rock and face are reinforced using advanced curtain-grouting, horizontal jet grouting stake mode.
5. the underground digging in subway station construction technology as described in claim 1 or 3, it is characterized in that, in the step 1, bow member is close to Arch preliminary bracing is set, 30~70cm of every two product Pin spacing.
6. underground digging in subway station construction technology as claimed in claim 3, it is characterized in that, three sections of settings of the bow member point, three sections Connected by ring flange between bow member, bow member is connected with bearing by connector.
7. the underground digging in subway station construction technology as described in claim 1 or 3 or 6, it is characterized in that, in the step 1, bearing edge The axially consecutive setting of tunnel, bearing is poured by armored concrete and formed.
8. underground digging in subway station construction technology as claimed in claim 7, it is characterized in that, by bearing after the completion of arch springing excavation Anchor pole is oliquely downward applied, bearing is then carried out and is poured, anchor pole end is integral with bar connecting in bearing, and upper surface of support is pre- The connector that system is connected with bow member.
9. underground digging in subway station construction technology as claimed in claim 1, it is characterized in that, in the step 2, station main body is excavated Position spacing 50~100m, every grade of 7~9m of step spacing are excavated in position and station arch.
10. underground digging in subway station construction technology as claimed in claim 1, it is characterized in that, in the step 2, its support reinforcement Method is:In tunnel side, wall oliquely downward applies anchor pole, and carries out shotcrete with mesh treatment to tunnel side wall.
CN201710054139.8A 2017-01-24 2017-01-24 A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground CN106761778B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107461201A (en) * 2017-09-30 2017-12-12 中铁二局集团有限公司 The damping protection system and its construction method of hard rock subway station in a kind of middle hole method Blasting Excavation
CN108019210A (en) * 2017-12-12 2018-05-11 宁波市交通规划设计研究院有限公司 A kind of Shallow-buried Large-span Tunnel construction method suitable for upper soft lower hard compound stratum
CN108131145A (en) * 2017-12-20 2018-06-08 中铁五局集团有限公司 A kind of construction method of super-span tunnel excavation support
CN108266209A (en) * 2017-12-29 2018-07-10 中铁隆工程集团有限公司 A kind of big ledge method in large section subway station excavates the rapid constructing method of lower part
CN108361036A (en) * 2018-03-14 2018-08-03 北京市政路桥股份有限公司 A kind of construction method that subway station accessory structure is plug-in
CN108756894A (en) * 2018-04-23 2018-11-06 中铁二十五局集团第工程有限公司 Tunnel micro- three step top Core Soil construction
CN109139021A (en) * 2018-11-01 2019-01-04 中铁十八局集团有限公司 A kind of more pilot tunnel Construction Organization Methods of multi-step
CN109162723A (en) * 2018-11-01 2019-01-08 中铁十八局集团有限公司 A kind of more pilot tunnel tunnel temporary steel support Demolition Construction methods of big cross section

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CN102226399A (en) * 2011-06-02 2011-10-26 中铁二院工程集团有限责任公司 Soft rock four-line large-span tunnel three-bench cable-bracing excavation construction method
CN102562074A (en) * 2012-02-03 2012-07-11 中铁四局集团第二工程有限公司 Construction method for composite stratum with hard top and soft bottom of large-section tunnel
CN102606162A (en) * 2012-02-08 2012-07-25 中铁四局集团第二工程有限公司 Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel
CN104847362A (en) * 2015-01-29 2015-08-19 中铁二院工程集团有限责任公司 Large-span subway station underground excavation construction method for hard rock stratum

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Publication number Priority date Publication date Assignee Title
CN102226399A (en) * 2011-06-02 2011-10-26 中铁二院工程集团有限责任公司 Soft rock four-line large-span tunnel three-bench cable-bracing excavation construction method
CN102562074A (en) * 2012-02-03 2012-07-11 中铁四局集团第二工程有限公司 Construction method for composite stratum with hard top and soft bottom of large-section tunnel
CN102606162A (en) * 2012-02-08 2012-07-25 中铁四局集团第二工程有限公司 Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel
CN104847362A (en) * 2015-01-29 2015-08-19 中铁二院工程集团有限责任公司 Large-span subway station underground excavation construction method for hard rock stratum

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107461201A (en) * 2017-09-30 2017-12-12 中铁二局集团有限公司 The damping protection system and its construction method of hard rock subway station in a kind of middle hole method Blasting Excavation
CN107461201B (en) * 2017-09-30 2019-06-25 中铁二局集团有限公司 The construction method of the damping protection system of hard rock subway station in a kind of middle hole method Blasting Excavation
CN108019210A (en) * 2017-12-12 2018-05-11 宁波市交通规划设计研究院有限公司 A kind of Shallow-buried Large-span Tunnel construction method suitable for upper soft lower hard compound stratum
CN108131145A (en) * 2017-12-20 2018-06-08 中铁五局集团有限公司 A kind of construction method of super-span tunnel excavation support
CN108266209A (en) * 2017-12-29 2018-07-10 中铁隆工程集团有限公司 A kind of big ledge method in large section subway station excavates the rapid constructing method of lower part
CN108361036A (en) * 2018-03-14 2018-08-03 北京市政路桥股份有限公司 A kind of construction method that subway station accessory structure is plug-in
CN108756894A (en) * 2018-04-23 2018-11-06 中铁二十五局集团第工程有限公司 Tunnel micro- three step top Core Soil construction
CN108756894B (en) * 2018-04-23 2019-09-17 中铁二十五局集团第一工程有限公司 Tunnel micro- three step top Core Soil construction
CN108756894B8 (en) * 2018-04-23 2019-12-24 中铁二十五局集团第一工程有限公司 Tunnel micro three-step upper core soil construction method
CN109139021A (en) * 2018-11-01 2019-01-04 中铁十八局集团有限公司 A kind of more pilot tunnel Construction Organization Methods of multi-step
CN109162723A (en) * 2018-11-01 2019-01-08 中铁十八局集团有限公司 A kind of more pilot tunnel tunnel temporary steel support Demolition Construction methods of big cross section

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