CN209398434U - A kind of upper-soft lower-hard ground tunnel excavation support structure - Google Patents
A kind of upper-soft lower-hard ground tunnel excavation support structure Download PDFInfo
- Publication number
- CN209398434U CN209398434U CN201920058155.9U CN201920058155U CN209398434U CN 209398434 U CN209398434 U CN 209398434U CN 201920058155 U CN201920058155 U CN 201920058155U CN 209398434 U CN209398434 U CN 209398434U
- Authority
- CN
- China
- Prior art keywords
- arch
- shaped steel
- tunnel
- steel frame
- ledge
- 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.)
- Active
Links
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses a kind of upper-soft lower-hard ground tunnel excavation support structures, belong to technical field of tunnel construction.A kind of upper-soft lower-hard ground tunnel excavation support structure, it is characterized in that: including ledge and tunnel lower layer solid rock, the ledge is by multiple arch-shaped steel frames, several ductules and shotcrete layer composition, the arch-shaped steel frame is sequentially arranged and links together along tunnel direction, the arch angle of the arch-shaped steel frame is fixed on tunnel lower layer solid rock after expanding, the ductule is arranged in arch crown part and squeezes into the soft stratum of tunnel top and its tail portion welds together with the arch-shaped steel frame, the arch-shaped steel frame is wrapped in inside and forms big arch springing at arch springing position by the shotcrete layer.Ledge structural strength in the utility model is high, and the arch springing of ledge is supported on two sides and stablizes on basement rock, and ledge load can be transferred to lower layer's firm ground, can resist jointly load with massif, it is ensured that construction safety, and construction efficiency can be improved.
Description
Technical field
The utility model relates to a kind of tunnel excavation support structure, especially a kind of tunnel applied to upper-soft lower-hard ground
Excavation supporting structure, belongs to technical field of tunnel construction.
Background technique
First branch ledge method is a kind of new metro station construction technology, is suitable for upper-soft lower-hard ground, is lid digging technology
Development eliminates arch angle beam compared with two lining ledge law technologies, reduces working procedure and material utilization amount.And upper-soft lower-hard ground tunnel
Supporting construction mostly uses oval cyclization just branch, and the method for partial excavation supporting, construction efficiency is low, and safe pressure is big.By subway
The principle of the first branch ledge method in station is applied to upper-soft lower-hard ground tunnel support, studies a kind of new supporting construction and construction method
Tunnel excavation problem can preferably be solved.
Summary of the invention
In view of the above defects of the prior art, the utility model provides a kind of suitable for upper-soft lower-hard ground
Tunnel excavation support structure.
The utility model adopts the following technical scheme that realize: a kind of upper-soft lower-hard ground tunnel excavation support knot
Structure, it is characterized in that: include ledge and tunnel lower layer solid rock, the ledge by multiple arch-shaped steel frames, several ductules and
Shotcrete layer composition, the arch-shaped steel frame are sequentially arranged and link together along tunnel direction, the arch of the arch-shaped steel frame
Angle is fixed on tunnel lower layer solid rock after expanding, and the ductule is arranged in arch crown part and squeezes into tunnel top flabbily
In layer and its tail portion welds together with the arch-shaped steel frame, and the arch-shaped steel frame is wrapped in interior by the shotcrete layer
Portion simultaneously forms big arch springing at arch springing position.
Ledge structural strength in the utility model is high, and the arch springing of ledge is supported on two sides and stablizes on basement rock, ledge load
It can be transferred to lower layer's firm ground, load can be resisted jointly with massif, it is ensured that construction safety.
Further, to improve the stability of arch-shaped steel frame and guaranteeing the stability and structural strength of big arch springing position,
Arch springing position is welded with dowel and each arch-shaped steel frame is connected as entirety.Dowel can be used as in concrete after concrete consolidation
It sets muscle and improves structural strength.
Further, double layer bar, the injection coagulation are provided on the outside of the arch springing position of the arch-shaped steel frame
Soil layer wraps up the double layer bar.Double layer bar can guarantee the big thickness concrete density of injection, while double layer bar exists
The built-in reinforcing bar that can be used as concrete structure after concrete consolidation, can be improved the structural strength at big arch springing position, to improve arch
The overall structural strength of lid is conducive to vault load through first branch ledge and is transferred to basement rock, and massif is under the support of ledge from figure
At rock-steady structure.
Just branch ledge uses pilot tunnel small area excavation construction to the utility model, can reduce massif disturbance, and immediate support guarantees
The globality and stability of country rock.
The beneficial effects of the utility model are: the utility model, which uses, thickeies big arch springing mode, by branch structure branch at the beginning of arch
Support is stablized on basement rock in two sides, and the ledge structural strength of formation is high, and massif itself forms rock-steady structure, arch under the support of ledge
Lid load can be transferred to lower layer's firm ground, can resist jointly load with massif, it is ensured that construction safety, under the protection of ledge
When carrying out lower part Excavation Blasting, it is greatly improved the safety of construction.And the utility model is easy for construction, utilizes this reality
Construction efficiency height is greatly improved with novel.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of the tunnel excavation support structure in specific embodiment of the present invention.
In figure, 1, tunnel top soft stratum, 2, arch-shaped steel frame, 3, anchor pole, 4, big arch springing, 5, the hard rock of tunnel lower layer
Stone, 6, ductule, 7, double layer bar.
Specific embodiment
The utility model is further described below by non-limiting embodiment and in conjunction with attached drawing:
As shown in the picture, a kind of upper-soft lower-hard ground tunnel excavation support structure comprising ledge and tunnel lower layer are hard
Rock 5.The ledge is made of multiple arch-shaped steel frames 2, several ductules 6 and shotcrete layer, 2 edge of arch-shaped steel frame
Tunnel direction is sequentially arranged and is linked together by dowel, and the arch angle of the arch-shaped steel frame 2 is fixed under tunnel after expanding
On layer solid rock 5, the ductule 6 is arranged in arch crown part and squeezes into tunnel top soft stratum 1, and its tail portion with
The arch-shaped steel frame 2 welds together, and the arch-shaped steel frame 2 is wrapped in inside and at arch springing position by the shotcrete layer
Form big arch springing 4.
To improve the stability of arch-shaped steel frame and guaranteeing the stability and structural strength of big arch springing position, preferably in arch feet
Position is welded to connect muscle and each arch-shaped steel frame 2 is connected as entirety.
To guarantee to spray big thickness concrete density and improving the structural strength at big arch springing position, in the present embodiment,
Double layer bar 7 is provided on the outside of the arch springing position of the arch-shaped steel frame 2, the shotcrete layer wraps up the double steel bar
Net 7.
Upper-soft lower-hard ground tunnel excavation construction method using above-mentioned tunnel excavation support structure is: including walking as follows
It is rapid: (1) under conditions of weak blast, just branch button arch construction to be carried out using small pilot tunnel form: first carrying out the excavation construction of pilot tunnel, leads
Country rock is closed to its gunite concrete after wide open digging, then sets up arch-shaped steel frame 2,2 arch angle of arch-shaped steel frame expansion rear support is existed
On the solid rock 5 of two sides, and anchor pole 3, ductule 6 are set, the setting of anchor pole 3 passes through arch-shaped steel frame 2 in arch springing position, anchor pole 3
Squeeze into surrounding formation, arch-shaped steel frame 2 is anchored at surrounding formation by anchor pole 3, and it is soft that ductule 6 in keystone squeezes into tunnel top
In weak stratum 1, tail portion welds together with arch-shaped steel frame 2, is anchored at tunnel top soft stratum 1 in ductule 6 after slip casting
It is interior, ledge then is formed in 2 position gunite concrete of arch-shaped steel frame, the arch springing position of the ledge forms big arch springing 4；(2) exist
Carry out tunnel lower part Excavation Blasting under the protection of ledge, sequence of excavation are the sequence of two sides behind first centre.
To guarantee to spray big thickness concrete density and improving the structural strength at big arch springing position, it is preferable that injection coagulation
Double layer bar 7 is arranged in outside before native at the arch springing position of arch-shaped steel frame 2.When gunite concrete, double layer bar 7 be can guarantee
The density of big thickness concrete is sprayed, and double layer bar can be used as the built-in steel of concrete structure after concrete consolidation
Muscle can be improved the structural strength at big arch springing position, improve the overall structural strength of ledge.
Other parts in the present embodiment are the prior art, and details are not described herein.
Claims (3)
1. a kind of upper-soft lower-hard ground tunnel excavation support structure, it is characterized in that: including ledge and tunnel lower layer solid rock
(5), the ledge is made of multiple arch-shaped steel frames (2), several ductules (6) and shotcrete layer, the arch-shaped steel frame
(2) it is sequentially arranged and links together along tunnel direction, the arch angle of the arch-shaped steel frame (2) is fixed on tunnel lower layer heavily fortified point after expanding
On hard rock (5), the ductule (6) setting is in arch crown part and squeezes into tunnel top soft stratum (1) and its tail portion
Weld together with the arch-shaped steel frame (2), the arch-shaped steel frame (2) is wrapped in inside and encircleed by the shotcrete layer
Foot position forms big arch springing (4).
2. upper-soft lower-hard ground tunnel excavation support structure according to claim 1, it is characterized in that: being welded at arch springing position
There is dowel that each arch-shaped steel frame (2) is connected as entirety.
3. upper-soft lower-hard ground tunnel excavation support structure according to claim 1 or 2, it is characterized in that: in the arch
Double layer bar (7) are provided on the outside of the arch springing position of steelframe (2), the shotcrete layer wraps up the double layer bar
(7)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920058155.9U CN209398434U (en) | 2019-01-14 | 2019-01-14 | A kind of upper-soft lower-hard ground tunnel excavation support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920058155.9U CN209398434U (en) | 2019-01-14 | 2019-01-14 | A kind of upper-soft lower-hard ground tunnel excavation support structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209398434U true CN209398434U (en) | 2019-09-17 |
Family
ID=67898410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920058155.9U Active CN209398434U (en) | 2019-01-14 | 2019-01-14 | A kind of upper-soft lower-hard ground tunnel excavation support structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209398434U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578027A (en) * | 2019-01-14 | 2019-04-05 | 中铁十局集团有限公司 | Upper-soft lower-hard ground tunnel excavation support structure and tunnel excavation construction method |
| CN114673528A (en) * | 2022-03-28 | 2022-06-28 | 中国电建集团成都勘测设计研究院有限公司 | Tunnel top cavity supporting method |
-
2019
- 2019-01-14 CN CN201920058155.9U patent/CN209398434U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578027A (en) * | 2019-01-14 | 2019-04-05 | 中铁十局集团有限公司 | Upper-soft lower-hard ground tunnel excavation support structure and tunnel excavation construction method |
| CN114673528A (en) * | 2022-03-28 | 2022-06-28 | 中国电建集团成都勘测设计研究院有限公司 | Tunnel top cavity supporting method |
| CN114673528B (en) * | 2022-03-28 | 2023-04-28 | 中国电建集团成都勘测设计研究院有限公司 | Tunnel top cavity supporting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109578027A (en) | Upper-soft lower-hard ground tunnel excavation support structure and tunnel excavation construction method | |
| CN108412542B (en) | A kind of wide lane digging gangue paste body filling of high seam is at lane method | |
| CN106703814B (en) | Tunneling subway station hole pile construction method | |
| CN106761778B (en) | A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground | |
| CN109209398B (en) | Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation method | |
| CN102155232B (en) | Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition | |
| CN108798702B (en) | Supporting method for large-section soft rock large-deformation tunnel | |
| CN209398434U (en) | A kind of upper-soft lower-hard ground tunnel excavation support structure | |
| SE1750913A1 (en) | Method for constructing extra-large variable cross section tunnel | |
| CN209179761U (en) | Pass through that high angle is inverse to rush rich water richness sand tomography supporting and protecting system of tunnel | |
| CN102758642A (en) | Long-span tunnel overlapping carrying arch structure for upper-soft and lower-hard stratum and construction method thereof | |
| CN203729308U (en) | Double-row pile supporting system of reinforced concrete pile combined structural steel cement mixing pile wall | |
| CN107143358A (en) | Opposite-pulling anchor cable structure for controlling tunnel bias deformation and construction method thereof | |
| CN104405411A (en) | Oversized variable cross section tunnel supporting structure | |
| CN110258536A (en) | Opposite-pulling anchor cable structure for reducing bias load and construction method | |
| CN106996299A (en) | Control the steel floral tube pile retaining structure and its construction method of tunnel biased deformation | |
| CN109914422A (en) | A kind of steel pipe and soil nailing combined type foundation pit supporting construction and construction method | |
| CN107237638A (en) | Both wired concealed tunneling structure and its construction method are worn under a kind of | |
| CN109209443A (en) | A kind of construction method of breaking surrounding rock tunnel structure | |
| CN109931077A (en) | Support system and its construction method for Segment rehabilitation | |
| CN104632228B (en) | Main track entering construction method for cross aisle and cross aisle | |
| CN109538236A (en) | A kind of tunnel structure and tunnel construction method | |
| CN202991054U (en) | Novel mine tunnel supporting structure | |
| CN107034905A (en) | Control the combination retaining structure and its construction method of biased deformation | |
| CN206785400U (en) | A kind of buffer-type high intensity mine support system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |