CN205742292U - A kind of to the protection structure of existing tunnel below newly-built underground engineering - Google Patents

A kind of to the protection structure of existing tunnel below newly-built underground engineering Download PDF

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Publication number
CN205742292U
CN205742292U CN201620517876.8U CN201620517876U CN205742292U CN 205742292 U CN205742292 U CN 205742292U CN 201620517876 U CN201620517876 U CN 201620517876U CN 205742292 U CN205742292 U CN 205742292U
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China
Prior art keywords
existing tunnel
steel pipe
tunnel
protection
uplift pile
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Withdrawn - After Issue
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CN201620517876.8U
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Chinese (zh)
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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Priority to CN201620517876.8U priority Critical patent/CN205742292U/en
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Withdrawn - After Issue legal-status Critical Current
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Abstract

What this utility model related to underground engineering builds technical field, in particular to a kind of to the protection structure of existing tunnel below newly-built underground engineering.Including being positioned at many uplift piles of the existing tunnel bearing of trend left and right sides and being set up in the steel pipe above existing tunnel, the uplift pile being positioned at existing tunnel homonymy is spaced evenly distributed successively, and steel pipe is fixed on the upper end of two relative uplift piles of existing tunnel both sides.The purpose of this utility model is to overcome above-mentioned deficiency and defect; solve the problem of excavation of foundation pit above current existing tunnel; a kind of excavation to existing tunnel and guard method are proposed; before reaching top excavation of foundation pit, operation tunnel is closed, reaches the excavation of foundation pit effect to existing tunnel zero disturbance.

Description

A kind of to the protection structure of existing tunnel below newly-built underground engineering
Technical field
What this utility model related to underground engineering builds technical field, in particular to one to below newly-built underground engineering both Cunicular protection structure.
Background technology
Along with the construction of urban rail traffic project, in each big city, main city zone has all built substantial amounts of Tunnel Engineering, 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 upwards to swell along with the resilience of the soil body.In order to reduce the protuberance of existing tunnel, the most employings are to tunnel two Side and top grouting in soil mass or stirring reinforcement protection, and uplift pile is set in both sides, tunnel takes into account certain buffer action, then Piecemeal carries out pouring of 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 tunnel, Long Pan road, Nanjing, Shanghai Dongfang Road lower cervical spine engineering, oasis, Spora Lygodii lake, Hangzhou The engineerings such as subsidence observation engineering, all have employed similar construction method.
After existing construction method tunnel upper soil excavation, excavation pit bottom surface in the vertical direction does not retrain, institute Can not fundamentally avoid the protuberance on stratum, lower section.Foundation ditch piecemeal excavation can utilize foundation ditch bottom soil body to swell in theory Tau-effect, reduces uplift capacity, but owing to reducing efficiency of construction, adds the most again at the bottom of foundation ditch open-assembly time, the most right The control action of pit accident is very limited.From the point of view of practice effect, partly descend the lower section caused during engineering soil excavation Tunnel heaving amount has exceeded the permission shift standards of tunnel normal operation.
It is proposed around tunnel, forms concrete protective shell in advance, the existing tunnel that reduction excavation of foundation pit causes Protuberance.China such as entitled " a kind of foundation ditch on top of underground railway tunnel excavation method " of Patent No. " CN104532849A " is real With new patent, the patent describe a kind of use diaphram wall and coordinate jacking tube coupling and coordinate cast in place concrete plate to form guarantor Protective case, then the construction method of excavation section by section carries out the method for protection on existing tunnel, and the method is first at the two of existing tunnel Safeguard structure is built in side, and this safeguard structure is the reinforced concrete wall that tube pile structure is formed with concreting, then at existing tunnel The top in road uses jacking that tube coupling is laid in the top of existing tunnel, casting concrete the underground with both sides in push pipe Diaphragm wall pours integral structure, completes to protect the construction of structure, and then the place apart from this protection structure 5m starts to construct the Two protection structures, between push pipe, the space of 5 meters is connected by cast-in-place concrete, the most successively alternation excavation.The method utilizes Vertical diaphram wall and the push pipe of level are collectively forming protection structure, are then reduced the work of excavation every time by interval construction Cheng Liang, reduces the probability of tunnel heaving.But during the method tunnel both sides construction of diaphragm wall on the impact of existing tunnel very Greatly, tunnel occurred level displacement and horizontal ovalizing deflection are easily caused;It addition, subway sectional tunnel is parallel in Practical Project Two tunnels, this is by making to protect the span of horizontal concrete slab in structure too big, when bottom-up protuberance, concrete slab Along with arching upward.If by the thickness resistance to deformation increasing plate, concrete slab thickness at least needs more than 3 meters, and this greatly increases Construction investment and difficulty of construction, be unfavorable for promoting the use of.
Utility model content
The purpose of this utility model seeks to existing alternation excavation, the section construction skill solving to mention in above-mentioned background technology The efficiency of construction that the protection scheme that art and existing utility model propose exists is low, and protected effect difference and scheme exploitativeness are poor Etc. problem, it is provided that a kind of new to the protection structure of existing tunnel below underground engineering.
The technical solution of the utility model is: a kind of to the protection structure of existing tunnel below newly-built underground engineering, and it is special Levy and be: include being positioned at many uplift piles of the existing tunnel bearing of trend left and right sides and be set up in the steel above existing tunnel Pipe, the uplift pile being positioned at existing tunnel homonymy is spaced evenly distributed successively, and steel pipe is fixed on two of existing tunnel both sides relatively The upper end of uplift pile.
The most described steel pipe and corresponding position, uplift pile upper end offer opening, and uplift pile upper end is provided with and is arranged in Reinforcing bar in this opening, uplift pile forms overall structure with steel pipe by reinforcing bar together with concreting.
The most described reinforcing bar is L-type structure, extend into uplift pile including what the length direction along uplift pile was arranged Interior lower rib and the length direction along steel pipe are arranged and are extend in steel pipe the upper rib hooking steel pipe from steel pipe opening part.
The most described pipe diameter meets personnel and carries out pipe cutting job requirements.
Between further adjacent steel pipe, spacing distance is 20~30cm.
A kind of existing tunnel below newly-built underground engineering is protected the construction method of structure, it is characterised in that: include with Lower step:
1, armored concrete uplift pile is set at interval, the both sides of existing tunnel bearing of trend;
2, working pit is originated, at opposite side resistance to plucking in side uplift pile away from excavation push pipe on the ground, side of existing tunnel Stake is away from excavating the reception working pit corresponding with originating working pit on ground, existing tunnel side;
3, push bench process is used to be pushed in reception working pit from originating working pit steel pipe one end;
4, artificial casting concrete formation steel tube concrete beam in steel pipe, and the uplift pile corresponding with existing tunnel both sides It is fixed together;
5, construct successively, be connected until all of steel tube concrete beam is fixing with the upper end of uplift pile, form existing tunnel Protection structure, then excavation steel pipe above the soil body, construction plan to build underground structure.
The most described step is manually entered in steel pipe, first steel pipe is cut open with junction, uplift pile upper end, Rib under the upper end of uplift pile is implanted, extend into upper rib in steel pipe from the opening cut open again, finally at steel pipe with anti- In pile pulling, uplift pile, lower rib, upper rib and steel pipe are fixedly connected as overall structure by concrete perfusion.
Advantage of the present utility model has: along with the fast development in city, city space is more and more nervous, Process of Urban Development In inevitably run into the situation building foundation ditch above operation tactics.In traditional method, to protect above operation tunnel Stay and be undisturbed the soil body in a large number, the method that this utility model method builds protection structure by outside at existing tunnel in advance, can Effectively to prevent the problem of the existing tunnel protuberance caused because of excavation, excavation of foundation pit can be excavated to above tunnel roof 2~ The position of 3m, it is possible to utilize the underground space to greatest extent.
Building in the work progress of the protection structure outside existing tunnel, each construction procedure is equal to the disturbance of existing tunnel The least, it is greatly improved the security reliability during subway tunnel operation.
Therefore the existing tunnel protection structure that this utility model is built can be not required to along the most arbitrarily extension of existing tunnel The construction method of excavation section by section to be used, foundation ditch of the present utility model can disposably excavate and not worry that tunnel is grand The problem playing deformation, drastically increases the progress of foundation pit construction and the globality of structure.
Additionally, this utility model method goes for several the parallel situations in tunnel, by increasing between parallel tunnels If uplift pile, and be connected with the concrete filled steel tube of level, reduce the span of level protection structure, can prevent level from protecting structure Excessive arching upward is produced with landing surface protuberance.
In general, the purpose of this utility model is to overcome above-mentioned deficiency and defect, solves above current operation tunnel Excavation of foundation pit affects problem to existing tunnel, proposes a kind of guard method to operation tunnel, it is achieved excavation of foundation pit is to operation The most undisturbed effect in tunnel.
Accompanying drawing explanation
The structural representation of Fig. 1: the step 1 of the present embodiment;
The structural representation of Fig. 2: the step 2 of the present embodiment;
The structural representation of Fig. 3: the step 3 of the present embodiment;
The structural representation of Fig. 4: the step 4 of the present embodiment;
The structural representation of Fig. 5: the step 5 of the present embodiment;
The A-A view of Fig. 6: Fig. 5 of the present utility model;
Wherein: 1 existing tunnel;2 uplift piles;3 originate working pit;4 receive working pit;5 steel pipes;6 ground Lower structure;7 excavation pits;Rib on 8;9 times ribs.
Detailed description of the invention
The utility model 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 for existing tunnel 1 bearing of trend two Many uplift piles 2 of side, the uplift pile 2 being positioned at existing tunnel 1 homonymy is spaced evenly distributed successively, and uplift pile 2 is centered around existing The left and right sides (as it is 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 The distance of 2 distance existing tunnels 1 is not less than 1m.The uplift pile 2 of existing tunnel 1 both sides is positioned opposite, and the upper end of uplift pile 2 is arranged Having steel pipe 5, steel pipe 5 is the steel-tube construction being set up between excavation pit 7 and existing tunnel 1, uses push bench process to be installed by steel pipe 5 Above existing tunnel 1.
The construction method of uplift pile 2 is: first hole in the both sides of existing tunnel 1, then irrigates reinforcing bar in hole and mixes Solidifying soil forms uplift pile 2.Uplift pile 2 is reinforced concrete structure, perfusion mortar in the hole of uplift pile 2 upper end, it is simple to steel pipe 5 Jacking construction.
In steel pipe 5, concrete perfusion forms steel tube concrete beam, and the middle part of beam is separately fixed at the right of existing tunnel 1 both sides Answer uplift pile 2 upper end of position, form " π " type frame structure with two uplift piles 2, many along the arrangement of existing tunnel 1 bearing of trend Individual " π " type frame structure, is spaced 20~30cm between adjacent " π " type frame structure, multiple " π " type frame structure is formed and is centered around Protection structure outside existing tunnel 1.
Steel pipe 5 just position to uplift pile 2 offers opening, and reinforcing bar is implanted in the upper end of anti-tabular 2, and reinforcing bar passes through concrete Pour and be fixed on 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 lower rib 9 arranged and the upper rib 8 of the length direction layout along steel pipe 5, lower rib 9 is cast in uplift pile 2, upper rib 8 Being cast in steel pipe 5, upper rib 8 is fixed on the upper end of lower rib 9 and forms L-type structure with lower rib 9.
Concrete work progress comprises the following steps:
1 as it is shown in figure 1, arrange reinforcing bar uplift pile 2 at interval, the both sides of existing tunnel 1 bearing of trend, and uplift pile 2 uses Drill-pouring method is constructed, and the bearing of trend along existing tunnel 1 is arranged successively;
2 as in figure 2 it is shown, originate working pit in side uplift pile 2 away from excavation push pipe on the ground, side of existing tunnel 1 3, in opposite side uplift pile 2 away from excavating the reception working pit 4 corresponding with originating working pit 3 on ground, existing tunnel 1 side, begin The both sides sending out working pit 3 and receive working pit 4 and lay respectively at excavation pit 7, owing to originating working pit 3 and receiving working pit 4 also Not being positioned at the top of existing tunnel 1, excavation the two hole can't cause the protuberance of existing tunnel 1 to deform, and existing tunnel 1 Both sides form lateral protection structure already provided with uplift pile 2, uplift pile 2, it is also possible to prevent existing tunnel 1 to both sides occur Horizontal displacement;
3 as it is shown on figure 3, use push bench process to push in reception working pit 4 by steel pipe 5 one end from originating working pit 3, steel Pipe 5 is perpendicular to the bearing of trend of existing tunnel 1, and steel pipe 5 passes from the mortar of uplift pile 2 upper end;
4, as shown in Figure 4, the uplift pile 2 that steel pipe 5 is relative with two of existing tunnel 1 both sides is fixed together shape Becoming " π " shape framework, concrete operation is, staff enters in steel pipe 5, is cut open with junction, uplift pile 2 upper end by steel pipe 5, Again the upper end of uplift pile 2 implant reinforcing bar, upper rib 8 is inserted in the steel pipe 5 cut open, casting concrete by upper rib 8, Steel pipe 5, lower rib 9 and uplift pile 2 pour and are fixed together, concrete perfusion in steel pipe 5;
5 as it is shown in figure 5, construct successively, is connected until all of steel pipe 5 is fixing with the upper end of uplift pile 2, excavates steel pipe 5 The top soil body, underground structure 6 is planned to build in construction.
Of the present utility model ultimate principle, principal character and of the present utility model advantage have more than been shown and described.One's own profession Skilled person will appreciate that of industry, this utility model is not restricted to the described embodiments, described in above-described embodiment and description Principle of the present utility model is simply described, on the premise of without departing from this utility model spirit and scope, this utility model also can There are various changes and modifications, in the range of these changes and improvements both fall within claimed this utility model.This utility model is wanted Protection domain is asked to be defined by appending claims and equivalent thereof.

Claims (5)

1. one kind to the protection structure of existing tunnel below newly-built underground engineering, it is characterised in that: include being positioned at existing tunnel (1) Many uplift piles (2) of the bearing of trend left and right sides and be set up in the steel pipe (5) of existing tunnel (1) top, are positioned at existing tunnel (1) uplift pile (2) of homonymy is spaced evenly distributed successively, and steel pipe (5) is fixed on two relative resisting of existing tunnel (1) both sides The upper end of pile pulling (2).
It is a kind of to the protection structure of existing tunnel below newly-built underground engineering, it is characterised in that: institute The steel pipe (5) stated and uplift pile (2) corresponding position, upper end offer opening, and uplift pile (2) upper end is provided with and is arranged in this opening Reinforcing bar, uplift pile (2) and steel pipe (5) form overall structure by reinforcing bar together with concreting.
It is a kind of to the protection structure of existing tunnel below newly-built underground engineering, it is characterised in that: institute The reinforcing bar stated is L-type structure, the lower rib (9) extending in uplift pile (2) arranged including the length direction along uplift pile (2) Arrange with the length direction along steel pipe (5) and extend into the upper rib hooking steel pipe (5) in steel pipe (5) from steel pipe (5) opening part (8)。
It is a kind of to the protection structure of existing tunnel below newly-built underground engineering, it is characterised in that: institute Steel pipe (5) internal diameter stated meets personnel and carries out pipe cutting job requirements.
It is a kind of to the protection structure of existing tunnel below newly-built underground engineering, it is characterised in that: phase Between adjacent steel pipe (5), spacing distance is 20~30cm.
CN201620517876.8U 2016-05-31 2016-05-31 A kind of to the protection structure of existing tunnel below newly-built underground engineering Withdrawn - After Issue CN205742292U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105862930A (en) * 2016-05-31 2016-08-17 中铁第四勘察设计院集团有限公司 Protection structure on existing tunnel below new underground engineering

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105862930A (en) * 2016-05-31 2016-08-17 中铁第四勘察设计院集团有限公司 Protection structure on existing tunnel below new underground engineering
CN105862930B (en) * 2016-05-31 2018-05-15 中铁第四勘察设计院集团有限公司 A kind of protection structure to creating existing tunnel below underground engineering

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GR01 Patent grant
C14 Grant of patent or utility model
AV01 Patent right actively abandoned

Granted publication date: 20161130

Effective date of abandoning: 20180515

AV01 Patent right actively abandoned