CN206957742U - A kind of long span under soft rock tunnel excavation support structure - Google Patents
A kind of long span under soft rock tunnel excavation support structure Download PDFInfo
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- CN206957742U CN206957742U CN201720265959.7U CN201720265959U CN206957742U CN 206957742 U CN206957742 U CN 206957742U CN 201720265959 U CN201720265959 U CN 201720265959U CN 206957742 U CN206957742 U CN 206957742U
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- steelframe
- supporting
- joist
- support structure
- tunnel excavation
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Abstract
It the utility model is related to a kind of long span under soft rock tunnel excavation support structure, including preliminary bracing body and secondary lining body, the preliminary bracing body includes some supporting steelframe rings, some supporting steelframe central spacers are set, and connected by the joist located at supporting steelframe ring both sides, the supporting steelframe ring includes spaced steelframe web and longitudinally connected muscle, and longitudinally connected muscle is trapezoidal layout, on steelframe web, joist is installed simultaneously with longitudinally connected muscle；Secondary lining body week in preliminary bracing body.Tunnel vault position sets the double-deck solid matter advanced tubules of Φ 42；Tunnel side wall sets the grouting rock bolts of Φ 22；Also include horizontal false stull steelframe supporting；Tunnel side wall scope Support Steel Holder joint position sets Φ 42 to lock pin anchor tube, and anchor tube connection ring plate consolidates itself and supporting steelframe weld anchor.Compared to currently used measure method, the set supporting construction supporting effect more preferably, can largely save engineering material, and economic benefit of engineering and social benefit are notable.
Description
Technical field
It the utility model is related to a kind of tunnel excavation support structure, and in particular to a kind of long span under soft rock tunnel excavation support knot
Structure, belong to Tunnel Engineering technical field.
Background technology
With greatly developing for railway construction, Tunnel Engineering construction condition is increasingly sophisticated, Tunnel Engineering design and construction skill
Art faces a severe challenge further.For the big across railway tunnel, its digging process of the poor location of country rock physical and mechanical parameter index
In typically deform larger, the common liner supporting structure using " preliminary bracing structure+secondary liner structure " is difficult to be effectively ensured
Tunnel engineering resistance to overturning, technical measures are slightly improper easily to cause engineering accident.Most long span under soft rock tunnel at present
Generally use strengthening supporting steelframe model, thicken the mode of secondary lining thickness to solve above-mentioned problem, this measure construction costs compared with
Height, economic benefit and social benefit are low.Therefore, for long span under soft rock tunnel, it is badly in need of a kind of long span under soft rock tunnel rational in infrastructure
Road excavation supporting structure.
The content of the invention
Based on the above situation, the purpose of this utility model is to solve railway tunnel excavation supporting structure across soft rock greatly at present
Ineffective engineering problem, and propose a kind of effective excavation supporting structure.
The utility model proposes a kind of long span under soft rock tunnel excavation support structure, a kind of tunnel excavation support structure, bag
Include preliminary bracing body and secondary lining body, it is characterised in that：The preliminary bracing body includes some supporting steelframe rings, some supportings
Steelframe central spacer is set, and is connected by the joist located at supporting steelframe ring both sides, and the supporting steelframe ring includes being arranged at intervals
Steelframe web and longitudinally connected muscle, on facade, longitudinally connected muscle is trapezoidal layout, on steelframe web, joist and longitudinal direction
Dowel is installed simultaneously；Secondary lining body week in preliminary bracing body.Further, in addition to stull steelframe, stull
Steelframe termination is connected with both sides joist.It is mainly used in the support of excavation face ring, is set laterally according to excavating sequences in digging process
False stull steelframe supporting.
Further, in addition to lock pin anchor tube, the lock pin anchor tube are located at Support Steel Holder joint position, are in along steelframe both sides
Certain angle is alternately arranged, and is locked and is fixed between pin anchor tube and steelframe by anchor tube connection ring plate, anchor tube connection ring plate is located at supporting
For steelframe close to the side wing edge outer panel face of country rock one, the plate face is provided with lock pin anchor tube perforation lanes.All anchor tubes are all in compression shape
State, anchor tube is connected with steelframe should meet by pressure request.
Further, in addition to support anchor rod, the support anchor rod are located in the tunnel side wall of supporting steelframe ring both sides.
Further, the joist respectively sets three in left and right sides abutment wall, is connected respectively with supporting steelframe, and joist is set
In upper or middle step steelframe footing position, joist is installed simultaneously with longitudinally connected muscle.
Further, joist is monolithic reinforced concrete structure, and cover to reinforcement is not less than 30mm, and joist section is square
Shape, the long side of rectangle are set close to country rock side.
Further, in addition to advanced tubule, the advanced tubule are located at tunnel vault at an angle, and bilayer is close
Arrangement is put, two rows ductule ring interlaced arrangement, and ductule longitudinal pitch is set by two Pin steelframes.Any one tunnel is horizontal
There is two layers of ductule in section.
The beneficial effects of the utility model are as follows：
The utility model adds part construction measure based on conventional lining supporting construction, can effectively ensure that long span under soft rock
Resistance to overturning during tunnel excavation.Compared to currently used measure method, the set supporting construction supporting effect more preferably, energy
A large amount of to save engineering material, economic benefit of engineering and social benefit are notable.
Brief description of the drawings
Fig. 1 is the utility model long span under soft rock tunnel excavation support structural composite lining section figure；
Fig. 2 is the structural representation of supporting steelframe of the present utility model；
Fig. 3 is the facade structures schematic diagram that steelframe dowel of the present utility model is connected with steelframe web；
Fig. 4 is the planar structure schematic diagram that steelframe dowel of the present utility model is connected with steelframe web；
Fig. 5 is the facade structures schematic diagram that lock pin anchor tube of the present utility model is connected with steelframe；
Fig. 6 is Fig. 5 A-A sectional views；
Fig. 7 is Fig. 6 B-B sectional views；
Fig. 8 is the structural representation that anchor tube connects ring plate；
Fig. 9 is the structural representation of support anchor rod of the present utility model；
Figure 10 is the vertical face structural representation of double-deck solid matter advanced tubule of the present utility model；
Figure 11 is the positive structure schematic of double-deck solid matter advanced tubule of the present utility model；
Figure 12 is the vertical structure schematic diagram of reinforced concrete supporting beam of the present utility model；
Figure 13 is Figure 12 A-A sectional views；
Figure 14 is Figure 12 B-B sectional views；
In figure respectively marked as：1- solid matter advanced tubules；2- preliminary bracing bodies；3- support anchor rods；4- secondary lining bodies；5-
Supporting steelframe；6- joists；7- stull steelframes；8- steelframe dowels；9- locks pin anchor tube；10- anchor tubes connect ring plate.
Embodiment
The utility model is described in further detail below by drawings and examples, but protection model of the present utility model
Enclose and be not limited to the content.
As Figure 1-4, a kind of long span under soft rock tunnel excavation support structure of the present embodiment, including the He of preliminary bracing body 2
Secondary lining body 4, preliminary bracing body include some supporting steelframe rings 5, and some supporting steelframe central spacers are set, and by located at branch
The joist 6 of shield steelframe ring both sides connects, and the supporting steelframe ring includes spaced steelframe web and longitudinally connected muscle 8, indulges
It is trapezoidal layout to dowel, on steelframe web, joist is installed simultaneously with longitudinally connected muscle；Secondary lining body is located at initial stage
Prop inner circumferential, in addition to solid matter advanced tubule 1 and support anchor rod 3.
Preliminary bracing body tunnel excavation face loopful set, in addition to C25 gunite concretes andBar-mat reinforcement, just spray is mixed
The solidifying thick 40mm of soil, multiple pneumatically placed concrete thickness 30mm.Secondary liner structure 4 is monolithic reinforced concrete structure, the specific root of lining thickness
Determined according to tunnel excavation cross dimensions and Analysis of Field Geotechnical Parameters checking computations.The supporting steelframe 5 of abutment wall uses I22 or I25 profile steel frames, specifically
Determine that steelframe is according to excavated section size segmentation prefabricating and assembly according to tunnel excavation cross dimensions and Analysis of Field Geotechnical Parameters checking computations.Support
Beam 6 is monolithic reinforced concrete structure, and reinforced concrete supporting beam muscle 8 longitudinally connected with steelframe is installed simultaneously, is welded with steelframe web
Connect in succession, weld bead height is not less than 10mm.The longitudinally connected muscle of steelframe can use HRB400 reinforcing bars, a diameter of 20-22mm, use
The U-shaped trapezoidal arrangement connection of connection reinforcing bar, is welded on steelframe web.
As shown in Fig. 2 the horizontal supporting of false stull steelframe 7, stull steelframe two are set according to excavating sequences in digging process
End termination is connected with both sides joist 6, is mainly used in the support of excavation face ring, its model and structure type and supporting steelframe 5 is consistent,
Selectively set according to Specific construction operating mode and process in work progress.
As viewed in figures 5-8, the present embodiment also includes lock pin anchor tube 9, locks a diameter of 42mm of pin anchor tube, is arranged at abutment wall scope
Support Steel Holder joint position, is alternately arranged along steelframe both sides, and being connected the full weld of ring plate 10 by anchor tube with steelframe welds, full seam height
Not less than 10mm；All anchor tubes are all in pressured state, and anchor tube is connected with steelframe should meet by pressure request；Lock pin anchor tube 9 has been constructed
Cheng Hou, it is connected ring plate 10 with anchor tube and welded.Anchor tube connection ring plate 10 is made of shaped steel steel disc, and plane is rectangle, size
For length × wide=180mm × 110mm；The reserved perforation lanes of lock pin anchor tube 9 of plate face, channel diameter 42mm；Anchor tube connects ring plate
10 it is pre-formed after be welded in supporting steelframe 5 in advance close to the side wing edge outer panel face of country rock one.
As shown in figure 9, the support anchor rod 3 of the present embodiment is in the tunnel side wall of supporting steelframe ring both sides.Support anchor rod is adopted
With grouting rock bolt, a diameter of 22mm or 25mm, length 3-5m.
As shown in figs. 10-11, the seamless steel floral tube of double-deck solid matter advanced tubule 1 use of the present embodiment, a diameter of 42mm,
Wall thickness is 3.5mm, and length 2.4-3.6m, ring spacing is 30cm；There is two layers of ductule in any one tunnel cross section,
And two rows ductule ring interlaced arrangement；Ductule longitudinal pitch is set by two Pin steelframes, is installed first close to face
Ductule locating steel frame, then apply ductule, another Pin steelframes be finally installed, so that the outer limb of ductule is minimum, reduce
Backbreak.
As shown in figs. 12-14, the cover to reinforcement of steelframe joist cannot be less than 30mm, rectangular cross section size for it is long × wide=
250mm × 210mm, long side are set close to country rock side；Reinforced concrete supporting beam 6 coordinate benching tunnelling method excavate, be arranged at or in
Step steelframe footing position.
Supporting construction is considered as deformation allowance design, after being closed in construction according to preliminary bracing, the knot after adjoining rock stability
Fruit adjusts；Pay special attention to deformation allowance mainly to consider to construct accident error and reserve, site operation should be to control country rock to become
Shape is target.
The utility model is as follows using step：
(1) in the tunnel tunnel face keystone construction double-deck solid matter advanced tubule advance support structures of Φ 42, and opening
Dig abutment wall scope and the grouting rock bolts of Φ 22 are set.
(2) merogenesis construction loopful supporting steelframe, longitudinally connected muscle is arranged circumferentially along steelframe between adjacent supporting steelframe and is connected, edge
Circuit longitudinal direction sets three reinforced concrete supporting beams to connect in left and right sides abutment wall scope, and supporting steelframe is arranged circumferentially steelframe connection
Muscle connects.
(3) horizontal false stull steelframe supporting is set according to Specific construction operating mode and process, selectivity.
(4) in digging process, Φ 42 is set to lock pin anchor tube in tunnel side wall scope Support Steel Holder joint position, and utilize anchor
Pipe connection ring plate consolidates itself and supporting steelframe weld anchor.
(5) construction secondary liner structure.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (7)
1. a kind of tunnel excavation support structure, including preliminary bracing body and secondary lining body, it is characterised in that：The preliminary bracing
Body includes some supporting steelframe rings, and some supporting steelframe central spacers are set, and is connected by the joist located at supporting steelframe ring both sides
Connecing, the supporting steelframe ring includes spaced steelframe web and longitudinally connected muscle, on facade, the longitudinally connected trapezoidal cloth of muscle
Put, on steelframe web, joist is installed simultaneously with longitudinally connected muscle；Secondary lining body week in preliminary bracing body.
A kind of 2. tunnel excavation support structure according to claim 1, it is characterised in that：Also include stull steelframe, stull
Steelframe termination is connected with both sides joist.
A kind of 3. tunnel excavation support structure according to claim 1, it is characterised in that：Also include lock pin anchor tube, it is described
Lock pin anchor tube is located at Support Steel Holder joint position, is alternately arranged at an angle along steelframe both sides, locks between pin anchor tube and steelframe
Ring plate is connected by anchor tube to fix, anchor tube connection ring plate is located at supporting steelframe close to the side wing edge outer panel face of country rock one, the plate
Face is provided with lock pin anchor tube perforation lanes.
A kind of 4. tunnel excavation support structure according to one of claim 1-3, it is characterised in that：Also include supporting anchor
Bar, the support anchor rod is in the tunnel side wall of supporting steelframe ring both sides.
A kind of 5. tunnel excavation support structure according to one of claim 1-3, it is characterised in that：The joist is in left and right
Two side walls respectively set three, are connected respectively with supporting steelframe, joist is arranged at or middle step steelframe footing position.
A kind of 6. tunnel excavation support structure according to claim 5, it is characterised in that：The joist mixes for cast in place reinforced bar
Xtah Crude Clay structure, cover to reinforcement are not less than 30mm, and joist section is rectangle, and the long side of rectangle is set close to country rock side.
A kind of 7. tunnel excavation support structure according to one of claim 1-3, it is characterised in that：Also include small in advance lead
Pipe, the advanced tubule be located at tunnel vault at an angle, and double-deck solid matter is arranged, two rows ductule ring interlocks cloth
Put, ductule longitudinal pitch is set by two Pin steelframes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265959.7U CN206957742U (en) | 2017-03-17 | 2017-03-17 | A kind of long span under soft rock tunnel excavation support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265959.7U CN206957742U (en) | 2017-03-17 | 2017-03-17 | A kind of long span under soft rock tunnel excavation support structure |
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| Publication Number | Publication Date |
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| CN206957742U true CN206957742U (en) | 2018-02-02 |
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ID=61377383
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720265959.7U Active CN206957742U (en) | 2017-03-17 | 2017-03-17 | A kind of long span under soft rock tunnel excavation support structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108756948A (en) * | 2018-06-15 | 2018-11-06 | 中铁工程设计咨询集团有限公司 | A kind of longspan tunnel prestressed anchor net branch shell is from carrying supporting construction |
| CN112814715A (en) * | 2021-01-07 | 2021-05-18 | 中铁十六局集团第三工程有限公司 | Novel locking anchor pipe construction fixing device and construction method thereof |
-
2017
- 2017-03-17 CN CN201720265959.7U patent/CN206957742U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108756948A (en) * | 2018-06-15 | 2018-11-06 | 中铁工程设计咨询集团有限公司 | A kind of longspan tunnel prestressed anchor net branch shell is from carrying supporting construction |
| CN108756948B (en) * | 2018-06-15 | 2023-06-20 | 中铁工程设计咨询集团有限公司 | Self-bearing supporting structure for large-span tunnel prestress anchor net supporting rock shell |
| CN112814715A (en) * | 2021-01-07 | 2021-05-18 | 中铁十六局集团第三工程有限公司 | Novel locking anchor pipe construction fixing device and construction method thereof |
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