CN108343035A - River construction method is worn under shallow tunnel - Google Patents

River construction method is worn under shallow tunnel Download PDF

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Publication number
CN108343035A
CN108343035A CN201810143144.0A CN201810143144A CN108343035A CN 108343035 A CN108343035 A CN 108343035A CN 201810143144 A CN201810143144 A CN 201810143144A CN 108343035 A CN108343035 A CN 108343035A
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CN
China
Prior art keywords
river
foundation pit
tunnel
excavation
construction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810143144.0A
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Chinese (zh)
Inventor
王利民
谷孝军
安楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway 12th Bureau Group Co Ltd
Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Original Assignee
China Railway 12th Bureau Group Co Ltd
Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway 12th Bureau Group Co Ltd, Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd filed Critical China Railway 12th Bureau Group Co Ltd
Priority to CN201810143144.0A priority Critical patent/CN108343035A/en
Publication of CN108343035A publication Critical patent/CN108343035A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B7/00Barrages or weirs; Layout, construction, methods of, or devices for, making same
    • E02B7/02Fixed barrages
    • 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
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/18Making embankments, e.g. dikes, dams
    • 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

Abstract

The present invention provides river construction method is worn under a kind of shallow tunnel, include the following steps:Water cut dam is applied in the upstream in the river, and waterwall is applied in the downstream in the river, to determine the river that shuts off;The excavation pit at the river that shuts off;Steel tube shed is applied respectively in the both sides foundation pit walls in the tunnel size mileage direction of the foundation pit;Shield arch is applied in the foundation pit;Backfill the foundation pit;Aqueduct is built above the foundation pit;Restore the flowing water in the river;And the tunnel of constructing below the river.The construction method provided through the invention reduces excavation of foundation pit scale, shortens construction period, has effectively evaded security risk, and reduce operating expenses.

Description

River construction method is worn under shallow tunnel
Technical field
The present invention relates to Municipal Engineering Construction fields, and in particular, to wears river under a kind of shallow tunnel in constructing tunnel Flow construction method.
Background technology
The case where wearing river under inevitably being encountered in constructing tunnel, the tunnel rivers Xia Chuan belong to high risk operation, The operation in river is especially worn under shallow tunnel.
In the prior art, full open-cut scheme is used when wearing river under shallow tunnel, i.e., is excavated downwards from ground slope Until tunnel bottom, tunnel structure is applied by open cut tunnel.But open-cut foundation ditch depth is deeper entirely, section excavation is very big, and tunnel is applied Work quantities is huge, and construction period is very long, and the so huge deep foundation pit construction risk of scale itself is very high, if encountering rainy season, Draining is not in time, it is likely that foundation pit is flooded by rainwater, and such security risk can higher.
Invention content
For wearing huge river construction method construction work amount, long construction period, safety under shallow tunnel in the prior art The high technical problem of risk can be reduced the present invention provides river construction method is worn under a kind of shallow tunnel using this method Excavation of foundation pit scale shortens construction period, effectively evades security risk.
To achieve the above object, river construction method is worn under shallow tunnel provided by the invention to include the following steps:Institute The upstream for stating river applies water cut dam, and applies waterwall in the downstream in the river, to determine the river that shuts off;At described section Excavation pit at fluid stream channel;Steel tube shed is applied respectively in the both sides foundation pit walls in the tunnel size mileage direction of the foundation pit; Shield arch is applied in the foundation pit;Backfill the foundation pit;Aqueduct is built above the foundation pit;Restore the flowing water in the river;With And the tunnel of constructing below the river.
Preferably, described to build aqueduct above the foundation pit, including:The flowing water side in river described in the aqueduct bottom To both sides apply ear wall respectively.
Preferably, the base length in the tunnel size mileage direction of the foundation pit is more than the river width in the river.
Preferably, the construction tunnel below the river, including:Top bar is excavated, until forming predetermined length Top bar;The side of step in excavation, and preliminary bracing is applied while excavating, after the excavation for completing the side, The other side of step in excavation, and the preliminary bracing is applied while excavating, until forming the middle step of predetermined length;It opens The side of step is dug down, and the preliminary bracing is applied while excavating, after the excavation for completing the side, under excavation The other side of step, and the preliminary bracing is applied while excavating, until forming getting out of a predicament or an embarrassing situation for predetermined length;Excavation is faced upward Arch, and the preliminary bracing is applied while excavating, until completing the excavation of inverted arch;Sandwich concrete is carried out to the inverted arch It pours with inverted arch described in one-pass molding;And secondary lining is carried out to the tunnel.
Preferably, the method further includes:Top bar arc soil tire is reserved when excavating the foundation pit.
Preferably, the method further includes:The top bar arc soil tire is modified smoother;
The shield that applied in the foundation pit is encircleed, including:The shield arch is applied on the top bar arc soil tire.
Preferably, the method further includes:Construction time section is selected according to the flow in the river.
Preferably, the method further includes:It is pre-buried while applying the water cut dam and the waterwall to be used for river Drainpipe of the water from upstream ejectment to downstream.
The technical solution provided through the invention, the present invention at least have the following technical effect that:
Method of the river construction method using half open cut, the river that will first be worn under tunnel are worn under the shallow tunnel of the present invention Road part retains, and the excavation pit at the river that shuts off, and builds shield arch, backfills foundation pit after shield arch is built and finished, and in base Aqueduct is applied in hole, then restores river flowing water, and the tunneling under the protection of aqueduct.Excavation of foundation pit scale is reduced, is contracted Short construction period, has effectively evaded security risk, and reduce operating expenses.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Fig. 1 is the flow chart that river construction method is worn under shallow tunnel provided by the invention;
Fig. 2 (a) is the side view that aqueduct in river construction method is worn under shallow tunnel provided in an embodiment of the present invention;
Fig. 2 (b) is the cross-sectional view that aqueduct in river construction method is worn under shallow tunnel provided in an embodiment of the present invention;
Fig. 3 (a) is the side view that aqueduct in river construction method is worn under shallow tunnel provided in an embodiment of the present invention;And
Fig. 3 (b) is the cross-sectional view that aqueduct in river construction method is worn under shallow tunnel provided in an embodiment of the present invention.
Reference sign
1 aqueduct, 11 side wall
12 aqueduct bottom, 13 ear wall
Specific implementation mode
The specific implementation mode of the embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this The described specific implementation mode in place is merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase Mutually combination.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is typically needle For direction shown in the drawings either for it is vertical, on vertical or gravity direction for each component mutual alignment relation Word is described.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Referring to FIG. 1, wearing river construction method under a kind of shallow tunnel of offer of the embodiment of the present invention, this method includes following Step:S101:Water cut dam is applied in the upstream in the river, and waterwall is applied in the downstream in the river, is cut with determining Fluid stream channel;S102:The excavation pit at the river that shuts off;S103:Both sides in the tunnel size mileage direction of the foundation pit Steel tube shed is applied in foundation pit walls respectively;S104:Shield arch is applied in the foundation pit;S105:Backfill the foundation pit;S106:Institute It states and builds aqueduct above foundation pit;S107:Restore the flowing water in the river;And S108:Described in constructing below the river Tunnel.
In the embodiment of the present invention, before tunnel excavation, one of intensity etc. is applied in the river upstream away from tunnel center line 50m For grade M10 mortar flag stones water cut dam to block flowing water, the dam body of water cut dam gos deep into riverbed bottom 100cm, dam body bottom width 150cm, top width 100cm, high 300cm;Simultaneously one of strength grade M10 mortar flag stone waterwall is applied in the river downstream away from tunnel center line 30m To prevent river water from flowing backwards, the wall of waterwall gos deep into riverbed bottom 0.5m, dam body wide 50cm, high 150cm.
After the river drainage that shuts off between water cut dam and waterwall, with 1 at the river that shuts off:0.75 gradient is downward Lead that arch springing absolute altitude is identical on excavation pit, foundation pit bottom absolute altitude and tunnel, length and tunnel of the foundation pit bottom in Vertical tunnel axis direction Road is of same size.Excavation of foundation pit in place after, with Bolt net and jet concrete enclosing excavation face.In the tunnel both sides foundation pit walls of foundation pit to Tunnel size mileage direction respectively applies one group of caliberThe steel tube shed of wall thickness 6mm, pipe canopy length L=10m, circumferential spacing 40cm, cementing-waterglass dual slurry in pipe canopy.
After steel tube shed erection finishes, shield arch is applied in foundation pit:Model I22 shaped steel arch is led on being laid in foundation pit Frame, arch spacing 50cm, arch springing adapter plate are wrapped up with sandbag, and arch is with a diameter ofBar connecting, use are a diameter of Reinforcing bar lays two layers of 20*20cm reinforced mesh, then pours the strength grade C30 concrete that thickness is 50cm, forms shield arch.
After shield arch concrete strength reaches design, foundation pit is backfilled, layering is banketed, and compaction in layers, compactness is not less than 98%.Respectively extend 20m to tunnel center line upstream and downstream and builds aqueduct.Referring to FIG. 2, Fig. 2 (a) is provided in an embodiment of the present invention applies The side view of aqueduct in work method, Fig. 2 (b) are the cross-sectional view of aqueduct in construction method provided in an embodiment of the present invention.It is repairing When building aqueduct (1), the side wall (11) of the strength grade M10 mortar flag stones of aqueduct both sides 60cm thickness is first built by laying bricks or stones, then pour 20cm thickness Strength grade C15 water-tight concretes aqueduct bottom (12).Aqueduct (1) construction, which finishes, removes water cut dam and waterwall, restores River flowing water.Under the protection of aqueduct (1), constructing tunnel is carried out in the lower section in river.
Method through the embodiment of the present invention reduces excavation of foundation pit scale, shortens construction period, has effectively evaded peace Full blast danger, and reduce operating expenses.
Preferably, described to build aqueduct above the foundation pit, including:The flowing water side in river described in the aqueduct bottom To both sides apply ear wall respectively.
Referring to FIG. 3, Fig. 3 (a) is the side view of aqueduct in construction method provided in an embodiment of the present invention, Fig. 3 (b) is this The cross-sectional view of aqueduct in the construction method that inventive embodiments provide.When building aqueduct (1), on aqueduct bottom (12) edge The both sides of the current direction in river apply downwards ear wall (13), ear wall (13) along tunnel axis direction length and aqueduct along tunnel The length of axis direction is identical, and the height of ear wall (13) perpendicular to the ground is 100cm, and the thickness of ear wall (13) is 80cm.
Method through the embodiment of the present invention can utilize ear wall (13) to prevent from oozing under river degradation and river water, protect Tunnel improves the safety of constructing tunnel.
Preferably, the base length in the tunnel size mileage direction of the foundation pit is more than the river width in the river.
In the embodiment of the present invention, since after excavation pit, the sandstone on foundation pit walls or foundation pit river both sides is more loose It dissipates, it is possible that the case where falling, it is preferable that when excavation pit, foundation pit bottom is along tunnel axis direction Length exceeds river width 100cm.
Method through the embodiment of the present invention can fall to avoid the sandstone on river both sides and then cause shadow to shield arch construction Ring, while the length of shield arch can be extended when shield arch applies, can preferably protection path, improve safety for tunnel engineering.
Preferably, the construction tunnel below the river, including:Top bar is excavated, until forming predetermined length Top bar;The side of step in excavation, and preliminary bracing is applied while excavating, after the excavation for completing the side, The other side of step in excavation, and the preliminary bracing is applied while excavating, until forming the middle step of predetermined length;It opens The side of step is dug down, and the preliminary bracing is applied while excavating, after the excavation for completing the side, under excavation The other side of step, and the preliminary bracing is applied while excavating, until forming getting out of a predicament or an embarrassing situation for predetermined length;Excavation is faced upward Arch, and the preliminary bracing is applied while excavating, until completing the excavation of inverted arch;Sandwich concrete is carried out to the inverted arch It pours with inverted arch described in one-pass molding;And secondary lining is carried out to the tunnel.
In the present invention, the tunnel in river is worn in tunnel under being excavated using three bench cut methods under the protection of steel tube shed and shield arch Road, shield encircle while leading preliminary bracing on being also, and the soil body is led on excavation and forms top bar, top bar length is controlled in 3-5m.In under Lead excavate vertical height be 370cm, under lead the left and right sides not only to avoid left and right to dig, also to avoid left and right and meanwhile open Dig, middle length of bench is maintained at 3-5m, gets out of a predicament or an embarrassing situation and be maintained at 10-15m away from branch distance at the beginning of inverted arch, under lead that primary to excavate drilling depth tight Lattice control in 1.0m/2 Pin steelframes, in lead arch and connect with the pre-buried steelframe of shield arch, excavation length of inverted arch must not exceed 200cm/4 Pin steelframes.It is led under in being applied by design requirement and inverted arch preliminary bracing.Inverted arch is constructed using self-propelled mobile trestle, Inverted arch concrete pours once per 6m, and inverted arch arch ring and filling cover mould realization placement layer by layer using totally-enclosed inverted arch, inverted arch with it is upper Face distance controlling is led within 30m.Two lining constructions are vibrated by window cast, layering using full-hydraulic lining trolley and pour coagulation Soil.
According to embodiments of the present invention, it then follows construction is led under in construction principle tissue, stringent control loop drilling depth is paid special attention to In, under lead and staggeredly construct, avoid to digging;Preliminary bracing is synchronous with excavation, closes early, makes country rock and supporting entirety stress.It applies Length of bench, stringent control inverted arch and the safe step pitch of lining cutting are strictly controlled in work, formation process is intersected, branch is parallel, it is quick, have The construction pattern of sequence, safety.Every operation is carried out according to safety regulation for operations.
Preferably, the method further includes:Top bar arc soil tire is reserved when excavating the foundation pit.
After steel tube shed erection finishes, shield arch is applied in foundation pit.Since shield arch is arch, so applying shield arch When need to set up the support of arch, and apply on arch support shield arch, reach design in the intensity of the concrete of shield arch And then remove arch support, construction procedure is cumbersome, and increases construction cost.So according to an embodiment of the invention, When excavation pit, reserves and above led the reserved native tire of arc, and be directly laid with splash guard on reserved native tire, in waterproof Shield arch is applied on plate.
Method through the embodiment of the present invention can further decrease the excavation workload of foundation pit, meanwhile, it has been also convenient for shield Arch applies, and improves the supporting role to shield arch, reduces construction cost.
Preferably, the method further includes:The top bar arc soil tire is modified smoother;
The shield that applied in the foundation pit is encircleed, including:The shield arch is applied on the top bar arc soil tire.
In the present invention, when applying shield arch, will it is reserved on to lead arc soil tire manual amendment smoother, make to lead arc soil tire Profile fits like a glove with shield arch Internal periphery, sets splash guard on upper arc soil tire upper berth of leading later, and shield arch is applied on native tire.Pass through The method of the embodiment of the present invention can make the outer profile of arc soil tire more regular, facilitate applying for shield arch.
Preferably, the method further includes:Construction time section is selected according to the flow in the river.
Because being influenced by rainwater, river is larger in wet-weather flow, and maximum stream flow is up to 800m3/h.If in river discharge It constructs when larger, then the river water in the river that shuts off is not easy drainage, and in excavation pit, it is likely that drainage of foundation pit is not in time by rain Water submerged influences the safety of constructing tunnel.So in the present invention, before constructing tunnel, it is thus necessary to determine that the flow in river, selection Constructing tunnel is carried out in the flow smaller period.
Method through the embodiment of the present invention can quickly drainage shut off the river water in river, base when avoiding river flow larger Hole is flooded by rainwater, improves the safety of constructing tunnel.
Preferably, the method further includes:It is pre-buried while applying the water cut dam and the waterwall to be used for river Drainpipe of the water from upstream ejectment to downstream.
In the embodiment of the present invention, while building water cut dam and waterwall by laying bricks or stones, pre-buried 6 diameters3 third polyethylene (PPR) drainpipe, by river water from upstream ejectment to downstream.It avoids river water from flooding foundation pit, further increases the peace of constructing tunnel Quan Xing.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme of the present invention Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally The thought of invention, it should also be regarded as the disclosure of the present invention.

Claims (8)

1. wearing river construction method under a kind of shallow tunnel, which is characterized in that this approach includes the following steps:
Water cut dam is applied in the upstream in the river, and waterwall is applied in the downstream in the river, to determine the river that shuts off;
The excavation pit at the river that shuts off;
Steel tube shed is applied respectively in the both sides foundation pit walls in the tunnel size mileage direction of the foundation pit;
Shield arch is applied in the foundation pit;
Backfill the foundation pit;
Aqueduct is built above the foundation pit;
Restore the flowing water in the river;And
It constructs below the river tunnel.
2. according to the method described in claim 1, it is characterized in that, described build aqueduct above the foundation pit, including:
The both sides of the current direction in river described in the aqueduct bottom apply ear wall respectively.
3. according to the method described in claim 1, it is characterized in that, the base length in the tunnel size mileage direction of the foundation pit More than the river width in the river.
4. according to the method described in claim 1, it is characterized in that, the construction tunnel below the river, including:
Top bar is excavated, until forming the top bar of predetermined length;
The side of step in excavation, and preliminary bracing is applied while excavating, after the excavation for completing the side, excavate The other side of middle step, and the preliminary bracing is applied while excavating, until forming the middle step of predetermined length;
The side got out of a predicament or an embarrassing situation is excavated, and the preliminary bracing is applied while excavating, after the excavation for completing the side, The other side got out of a predicament or an embarrassing situation is excavated, and the preliminary bracing is applied while excavating, until forming getting out of a predicament or an embarrassing situation for predetermined length;
Inverted arch is excavated, and the preliminary bracing is applied while excavating, until completing the excavation of inverted arch;
Sandwich concrete is carried out to the inverted arch to pour with inverted arch described in one-pass molding;And
Secondary lining is carried out to the tunnel.
5. according to the method described in claim 1, it is characterized in that, the method further includes:
Top bar arc soil tire is reserved when excavating the foundation pit.
6. according to the method described in claim 5, it is characterized in that, the method further includes:
The top bar arc soil tire is modified smoother;
The shield that applied in the foundation pit is encircleed, including:
The shield arch is applied on the top bar arc soil tire.
7. according to the method described in claim 1, it is characterized in that, the method further includes:
Construction time section is selected according to the flow in the river.
8. according to the method described in claim 1, it is characterized in that, the method further includes:
The pre-buried drainpipe for by river water from upstream ejectment to downstream while applying the water cut dam and the waterwall.
CN201810143144.0A 2018-02-11 2018-02-11 River construction method is worn under shallow tunnel Pending CN108343035A (en)

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CN109184699A (en) * 2018-08-20 2019-01-11 中铁六局集团有限公司 Existing river construction is worn under open trench tunnel
CN110042842A (en) * 2019-04-26 2019-07-23 中铁二十三局集团有限公司 A kind of open cut construction method of deep foundation ditch for wearing river
CN110454189A (en) * 2019-08-22 2019-11-15 中铁隧道集团三处有限公司 A kind of river tunnel Xia Chuan construction technology
CN111441793A (en) * 2020-03-23 2020-07-24 中交路桥建设有限公司 Construction method for subway station headwall in sandy gravel stratum

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Publication number Priority date Publication date Assignee Title
CN109184699A (en) * 2018-08-20 2019-01-11 中铁六局集团有限公司 Existing river construction is worn under open trench tunnel
CN109184699B (en) * 2018-08-20 2020-07-10 中铁六局集团太原铁路建设有限公司 Construction method for passing existing river channel under open trench tunnel
CN110042842A (en) * 2019-04-26 2019-07-23 中铁二十三局集团有限公司 A kind of open cut construction method of deep foundation ditch for wearing river
CN110454189A (en) * 2019-08-22 2019-11-15 中铁隧道集团三处有限公司 A kind of river tunnel Xia Chuan construction technology
CN111441793A (en) * 2020-03-23 2020-07-24 中交路桥建设有限公司 Construction method for subway station headwall in sandy gravel stratum

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