CN105862930B - A kind of protection structure to creating existing tunnel below underground engineering - Google Patents

A kind of protection structure to creating existing tunnel below underground engineering Download PDF

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Publication number
CN105862930B
CN105862930B CN201610379597.4A CN201610379597A CN105862930B CN 105862930 B CN105862930 B CN 105862930B CN 201610379597 A CN201610379597 A CN 201610379597A CN 105862930 B CN105862930 B CN 105862930B
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China
Prior art keywords
steel pipe
existing tunnel
uplift pile
uplift
tunnel
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CN105862930A (en
Inventor
肖明清
孙文昊
胡威东
李新平
范东方
豆海涛
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F11/00Rescue devices or other safety devices, e.g. safety chambers or escape ways

Abstract

Technical field is built the present invention relates to underground engineering, in particular to a kind of protection structure to creating existing tunnel below underground engineering.Including the more uplift piles at left and right sides of existing tunnel extending direction and the steel pipe being set up in above existing tunnel, the uplift pile positioned at existing tunnel homonymy is spaced evenly distributed successively, and steel pipe is fixed on the upper end of two opposite uplift piles of existing tunnel both sides.The purpose of the present invention is to overcome the above shortcomings and defect; solve the problems, such as excavation of foundation pit above current existing tunnel; it is proposed a kind of excavation to existing tunnel and guard method, operation tunnel is closed before reaching top excavation of foundation pit, reaches the effect that excavation of foundation pit disturbs existing tunnel zero.

Description

A kind of protection structure to creating existing tunnel below underground engineering
Technical field
Technical field is built the present invention relates to underground engineering, in particular to one kind to creating existing tunnel below underground engineering The protection structure in road.
Background technology
With the construction of urban rail traffic project, substantial amounts of Tunnel Engineering has been built in each big city main city zone, after When phase carries out Urban Underground Space Excavation or urban road tunnel construction above existing tunnel, the unloading meeting of stratum soil excavation Existing tunnel is caused to be swelled upwards with the rebound of the soil body.It is more using to tunnel two at present in order to reduce the protuberance of existing tunnel Side and top grouting in soil mass or stirring reinforcement protection, and set uplift pile to take into account certain buffer action in tunnel both sides, then Piecemeal carries out pouring for soil excavation and newly-built structure, by increasing ground stiffness layer, reducing each excavation area, utilizes space-time Effect reduces the uplift capacity in tunnel.Such as Nanjing Long Pan roads tunnel, Shanghai Dongfang Road lower cervical spine engineering, Hangzhou Jinsha lake oasis The engineerings such as subsidence observation engineering, employ similar construction method.
After existing construction method tunnel upper soil excavation, excavation pit bottom surface in the vertical direction does not constrain, institute Cannot fundamentally avoid the protuberance on lower section stratum.Foundation pit piecemeal excavates can utilize bottom of foundation ditch uplift of soil in theory Tau-effect, reduces uplift capacity, but due to reducing construction efficiency, objectively adds foundation pit bottom open-assembly time again, final right The control action of pit accident is very limited.From the point of view of practice effect, caused lower section during engineering soil excavation is partly descended Tunnel heaving amount has exceeded the permission shift standards of tunnel normal operation.
It is proposed that forming concrete protective shell around tunnel in advance, existing tunnel caused by excavation of foundation pit is reduced Protuberance.Such as the middle promulgated by the State Council of entitled " a kind of foundation ditch on top of underground railway tunnel excavation method " of Patent No. " CN104532849A " Bright patent, the patent describe one kind and coordinates jacking tube coupling using diaphram wall and coordinate cast in place concrete plate to form protection Shell, the method then protected on the construction method progress existing tunnel of excavation section by section, this method is first in the both sides of existing tunnel Safeguard structure is built, the reinforced concrete wall which forms for tube pile structure with concreting, then in existing tunnel Top tube coupling is laid in the top of existing tunnel using jacking, casting concrete and connect in push pipe with the underground of both sides Continuous wall pours integral structure, completes the construction of protection structure, then starts construction second apart from the place of protection structure 5m A protection structure, 5 meters of gap is connected by cast-in-place concrete between push pipe, then alternation excavation successively.This method utilizes perpendicular To diaphram wall and horizontal push pipe be collectively forming protection structure, then reduce the engineering excavated every time by being spaced construction Amount, reduces the probability of tunnel heaving.But influence during this method tunnel both sides construction of diaphragm wall to existing tunnel is very big, Easily cause tunnel occurred level displacement and horizontal ovalizing deflection;In addition, subway sectional tunnel is parallel in Practical Project Two tunnels, this will cause protect structure in horizontal concrete slab span it is too big, when bottom-up protuberance, concrete slab with And arch upward.If by increasing the thickness resistance to deformation of plate, concrete slab thickness at least needs more than 3 meters, which greatly increases Construction investment and difficulty of construction, are unfavorable for promoting the use of.
The content of the invention
Present invention aim to solve to mention in above-mentioned background technology existing alternation excavation, section construction technology with And low construction efficiency existing for the protection scheme that proposes of existing invention, the problems such as protecting effect difference and poor scheme exploitativeness, A kind of new protection structure of existing tunnel below underground engineering is provided.
The technical scheme is that:A kind of protection structure to creating existing tunnel below underground engineering, its feature exist In:Including the more uplift piles at left and right sides of existing tunnel extending direction and the steel pipe being set up in above existing tunnel, position It is spaced successively in the uplift pile of existing tunnel homonymy evenly distributed, steel pipe is fixed on two opposite resistance to pluckings of existing tunnel both sides The upper end of stake.
The further steel pipe offers opening with uplift pile upper end corresponding position, and uplift pile upper end, which is provided with, to be arranged in Reinforcing bar in the opening, uplift pile form overall structure by reinforcing bar with steel pipe together with concreting.
The reinforcing bar be L-type structure, including extend into uplift pile along the length direction arrangement of uplift pile Interior lower rib and it is extend into from steel pipe opening in steel pipe along the length direction arrangement of steel pipe and hooks the upper rib of steel pipe.
The further pipe diameter meets that personnel enter and carries out pipe cutting job requirements.
Spacing distance is 20~30cm between further adjacent steel pipe
A kind of construction method to creating the protection structure of existing tunnel below underground engineering, it is characterised in that:Including with Lower step:
1st, it is arranged at intervals armored concrete uplift pile in the both sides of existing tunnel extending direction;
2nd, push pipe is excavated on side ground of the side uplift pile away from existing tunnel and originates working pit, in opposite side resistance to plucking Stake excavates reception working pit corresponding with originating working pit on remote existing tunnel side ground;
3rd, steel pipe one end is pushed into reception working pit from working pit is originated using push bench process;
4th, manually casting concrete forms steel tube concrete beam, and uplift pile corresponding with existing tunnel both sides in steel pipe It is fixed together;
5th, construct successively, until all steel tube concrete beams are fixedly connected with the upper end of uplift pile, form existing tunnel Protection structure, then excavate steel pipe above the soil body, proposed underground structure of constructing.
It is manually entered in steel pipe in the further step, first cuts open steel pipe and uplift pile upper end junction, The rib under the implantation of the upper end of uplift pile again, upper rib is extend into steel pipe from the opening cut open, finally in steel pipe and anti- Uplift pile, lower rib, upper rib and steel pipe are fixedly connected as overall structure by concrete perfusion in pile pulling.
Advantages of the present invention has:With the fast development in city, city space is more and more nervous, in Process of Urban Development not It is evitable to run into the situation that foundation pit is built above operation tactics.In conventional method, to retain above operation tunnel big Amount is undisturbed the soil body, and method of the method for the present invention by building protection structure on the outside of existing tunnel in advance can be effective Prevent that because existing tunnel swells caused by excavation the problem of, excavation of foundation pit can be excavated to the position of 2~3m above tunnel roof, The underground space can be utilized to greatest extent.
In the work progress for building the protection structure on the outside of existing tunnel, disturbance of each construction procedure to existing tunnel is equal Very little, greatly improves the security reliability during subway tunnel operation.
The existing tunnel protection structure that the present invention is built can be along any extension in longitudinal direction of existing tunnel, therefore need not make With the construction method of excavation section by section, foundation pit of the invention, which can be excavated disposably, to be completed and asking without worry tunnel heaving deformation Topic, drastically increases the progress of foundation pit construction and the globality of structure.
In addition, the method for the present invention can be adapted for the parallel situation in several tunnels, it is anti-by being added between parallel tunnels Pile pulling, and be connected with horizontal concrete filled steel tube, reduces the span of horizontal protection structure, can prevent it is horizontal protect structure with Stratum protuberance produces excessive arch upward.
In general, the purpose of the present invention is to overcome the above shortcomings and defect, solves foundation pit above current operation tunnel The influence problem to existing tunnel is excavated, a kind of guard method to operation tunnel is proposed, realizes excavation of foundation pit to operation tunnel Substantially undisturbed effect.
Brief description of the drawings
Fig. 1:The structure diagram of the step 1 of the present embodiment;
Fig. 2:The structure diagram of the step 2 of the present embodiment;
Fig. 3:The structure diagram of the step 3 of the present embodiment;
Fig. 4:The structure diagram of the step 4 of the present embodiment;
Fig. 5:The structure diagram of the step 5 of the present embodiment;
Fig. 6:The A-A views of Fig. 5 of the present invention;
Wherein:1-existing tunnel;2-uplift pile;3-originate working pit;4-receive working pit;5-steel pipe;6-ground Lower structure;7-excavation pit;8-go up rib;9-lower rib.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1~5, the protection structure of the present embodiment is " π " type frame structure, including is 1 extending direction two of existing tunnel More uplift piles 2 of side, the uplift pile 2 positioned at 1 homonymy of existing tunnel are spaced evenly distributed successively, and uplift pile 2 is centered around existing The left and right sides (as shown in Figure 1, the left and right sides of existing tunnel is the left and right directions of existing tunnel 1 in figure) in tunnel 1, uplift pile 2 are not less than 1m apart from the distance of existing tunnel 1.The uplift pile 2 of 1 both sides of existing tunnel is positioned opposite, and the upper end of uplift pile 2 is set There is steel pipe 5, steel pipe 5 is the steel-tube construction being set up between excavation pit 7 and existing tunnel 1, steel pipe 5 is installed using push bench process In the top of existing tunnel 1.
The construction method of uplift pile 2 is:First drill in the both sides of existing tunnel 1, reinforcing bar is then irrigated in hole mixes Solidifying soil forms uplift pile 2.Uplift pile 2 is reinforced concrete structure, perfusion mortar in the hole of 2 upper end of uplift pile, easy to steel pipe 5 Jacking construction.
Concrete perfusion forms steel tube concrete beam in steel pipe 5, and pair of 1 both sides of existing tunnel is separately fixed in the middle part of beam 2 upper end of uplift pile of position is answered, " π " type frame structure is formed with two uplift piles 2, is arranged along 1 extending direction of existing tunnel more A " π " type frame structure, 20~30cm is spaced between adjacent " π " type frame structure, and multiple " π " type frame structures are formed and are centered around The protection structure in the outside of existing tunnel 1.
The position of 5 face uplift pile 2 of steel pipe offers opening, the upper end implantation reinforcing bar of anti-tabular 2, and reinforcing bar passes through concrete Pour and be fixed in uplift pile 2 and steel pipe 5, form overall structure, as shown in Figure 4.Reinforcing bar includes the length direction along uplift pile 2 The upper rib 8 of the lower rib 9 arranged and the length direction arrangement along steel pipe 5, lower rib 9 are cast in uplift pile 2, upper rib 8 It is cast in steel pipe 5, upper rib 8 is fixed on the upper end of lower rib 9 and lower rib 9 forms L-type structure.
Specific work progress comprises the following steps:
1st, as shown in Figure 1, being arranged at intervals reinforcing bar uplift pile 2 in the both sides of 1 extending direction of existing tunnel, uplift pile 2 uses Drill-pouring method is constructed, and is arranged successively along the extending direction of existing tunnel 1;
2nd, as shown in Fig. 2, push pipe is excavated on side ground of the side uplift pile 2 away from existing tunnel 1 originates working pit 3, in opposite side uplift pile 2 away from reception working pit 4 corresponding with originating working pit 3 is excavated on 1 side ground of existing tunnel, begin The both sides that working pit 3 is located at excavation pit 7 with receiving working pit 4 respectively are sent out, due to originating working pit 3 with receiving working pit 4 simultaneously The top of existing tunnel 1 it is not located at, excavating the two holes can't cause the protuberance of existing tunnel 1 to deform, and existing tunnel 1 Both sides be already provided with uplift pile 2, uplift pile 2 forms lateral protection structure, can also prevent existing tunnel 1 from occurring to both sides Horizontal displacement;
3rd, as shown in figure 3, being pushed into 5 one end of steel pipe in reception working pit 4 from working pit 3 is originated using push bench process, steel Perpendicular to the extending direction of existing tunnel 1, steel pipe 5 passes through pipe 5 from the mortar of 2 upper end of uplift pile;
4th, as shown in figure 4, two opposite uplift piles 2 of steel pipe 5 and 1 both sides of existing tunnel are fixed together shape Into " π " shape frame, specific process is that staff is entered in steel pipe 5, and steel pipe 5 and 2 upper end junction of uplift pile are cut open, Again uplift pile 2 upper end be implanted into reinforcing bar, upper rib 8 is inserted into the steel pipe 5 cut open, casting concrete by upper rib 8, Steel pipe 5, lower rib 9 and uplift pile 2 are poured and are fixed together, the concrete perfusion in steel pipe 5;
5th, as shown in figure 5, constructing successively, until all steel pipes 5 are fixedly connected with the upper end of uplift pile 2, steel pipe 5 is excavated The top soil body, proposed underground structure 6 of constructing.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent defines.

Claims (4)

  1. A kind of 1. protection structure to creating existing tunnel below underground engineering, it is characterised in that:Including positioned at existing tunnel (1) More uplift piles (2) at left and right sides of extending direction and the steel pipe (5) being set up in above existing tunnel (1), positioned at existing tunnel (1) uplift pile (2) of homonymy is spaced evenly distributed successively, steel pipe (5) be fixed on two of existing tunnel (1) both sides it is opposite anti- The upper end of pile pulling (2);Described steel pipe (5) internal diameter meets that personnel enter and carries out pipe cutting job requirements;The steel pipe (5) Opening is offered with uplift pile (2) upper end corresponding position, uplift pile (2) upper end is provided with the reinforcing bar being arranged in the opening, resistance to plucking Stake (2) forms overall structure by reinforcing bar with steel pipe (5) together with concreting;The reinforcing bar is L-type structure, including The lower rib (9) extending into uplift pile (2) and the length direction along steel pipe (5) arranged along the length direction of uplift pile (2) Arrange the upper rib (8) for being extend into from steel pipe (5) opening in steel pipe (5) and hooking steel pipe (5).
  2. A kind of 2. protection structure to creating existing tunnel below underground engineering as claimed in claim 1, it is characterised in that:Phase Spacing distance is 20~30cm between adjacent steel pipe (5).
  3. A kind of a kind of 3. construction party to creating the protection structure of existing tunnel below underground engineering as claimed in claim 1 Method, it is characterised in that:Comprise the following steps:
    1), reinforcing bar uplift pile (2) is arranged at intervals in the both sides of existing tunnel (1) extending direction;
    2) push pipe, is excavated on side ground of the side uplift pile (2) away from existing tunnel (1) and originates working pit (3), another Side uplift pile (2) excavates reception working pit (4) corresponding with originating working pit (3) on remote existing tunnel (1) side ground;
    3), steel pipe (5) one end is pushed into reception working pit (4) from working pit (3) is originated using push bench process;
    4), it is manually entered in steel pipe (5) that two opposite uplift piles (2) of steel pipe (5) and existing tunnel (1) both sides are fixed Link together;
    5), construct successively, until all steel pipes (5) are fixedly connected with the upper end of uplift pile (2), excavate necromancer on steel pipe (5) Body, proposed underground structure (6) of constructing.
  4. 4. a kind of construction method to creating the protection structure of existing tunnel below underground engineering as claimed in claim 3, its It is characterized in that:It is manually entered in the step 4) in steel pipe (5), first cuts steel pipe (5) and uplift pile (2) upper end junction Open, then the rib (9) under the implantation of the upper end of uplift pile (2), upper rib (8) is extend into from the opening cut open in steel pipe (5), Finally in steel pipe (5) and uplift pile (2) concrete perfusion by uplift pile (2), lower rib (9), upper rib (8) and steel pipe (5) It is fixedly connected as overall structure.
CN201610379597.4A 2016-05-31 2016-05-31 A kind of protection structure to creating existing tunnel below underground engineering Active CN105862930B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111218938A (en) * 2020-01-07 2020-06-02 中国建筑第八工程局有限公司 Excavation construction method for foundation pit above existing tunnel

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CN108517871A (en) * 2018-03-15 2018-09-11 大连交通大学 A kind of control excavation of foundation pit induces the structure and its construction method of tunnel upward floating
CN110409418A (en) * 2019-06-12 2019-11-05 苏州市轨道交通集团有限公司 Control the foundation reinforcing structure and construction method of existing subway tunnel deformation
CN110725344A (en) * 2019-10-25 2020-01-24 安徽省城建设计研究总院股份有限公司 Method for preventing existing tunnel from floating upwards during earthwork unloading
CN112523265A (en) * 2020-11-27 2021-03-19 广州地铁设计研究院股份有限公司 Protective structure for excavating foundation pit and spanning existing tunnel and construction method thereof

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CN204418391U (en) * 2015-01-16 2015-06-24 济南轨道交通集团有限公司 A kind of concrete composite beam and concrete filled steel tube column jointing gusset
CN204781355U (en) * 2015-05-22 2015-11-18 中南建筑设计院股份有限公司 Reinforced concrete roof beam and circular steel tube concrete column connected node
CN205742292U (en) * 2016-05-31 2016-11-30 中铁第四勘察设计院集团有限公司 A kind of to the protection structure of existing tunnel below newly-built underground engineering

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CN203161244U (en) * 2013-01-30 2013-08-28 中铁二院工程集团有限责任公司 Existing subway underground excavation running tunnel protection structure
KR101381325B1 (en) * 2013-05-30 2014-04-04 성은주 The non-open cut tunnel construction method using the multistage small diameter steel pipe
CN203569698U (en) * 2013-10-16 2014-04-30 中信建筑设计研究总院有限公司 Prestressed concrete beam and concrete-filled steel tube column joint structure
CN204418391U (en) * 2015-01-16 2015-06-24 济南轨道交通集团有限公司 A kind of concrete composite beam and concrete filled steel tube column jointing gusset
CN204781355U (en) * 2015-05-22 2015-11-18 中南建筑设计院股份有限公司 Reinforced concrete roof beam and circular steel tube concrete column connected node
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Publication number Priority date Publication date Assignee Title
CN111218938A (en) * 2020-01-07 2020-06-02 中国建筑第八工程局有限公司 Excavation construction method for foundation pit above existing tunnel

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