CN202215268U - Supporting structure for construction of hard rock large-section tunnel - Google Patents
Supporting structure for construction of hard rock large-section tunnel Download PDFInfo
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- CN202215268U CN202215268U CN2011203122318U CN201120312231U CN202215268U CN 202215268 U CN202215268 U CN 202215268U CN 2011203122318 U CN2011203122318 U CN 2011203122318U CN 201120312231 U CN201120312231 U CN 201120312231U CN 202215268 U CN202215268 U CN 202215268U
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Abstract
The utility model provides a supporting structure for construction of a hard rock large-section tunnel, which comprises an initial support and a temporary support, wherein the temporary support is composed of a plurality of vertical temporary supports and longitudinal temporary supports connected with the initial support arranged on an arch crown of the tunnel. The vertical temporary supports are arranged at the position of the tunnel center line arranged between the arch crown of the tunnel and a tunnel springing line, and the bottoms of the vertical temporary supports are supported on unexcavated rocks arranged at the position of the springing line and do not need to extend to the bottom of the tunnel section. The supporting structure for construction of the hard rock large-section tunnel solves the problems that during the multi-step blasting excavation construction process of (super) large-section hard rocks, the supporting processes are complex and slow, and destruction of blasting of temporary supports is large. The supporting structure for construction of the hard rock large-section tunnel has the advantages of being simple in structure, quick in construction progress, safe in construction, capable of preventing hard rock blasting from damaging a temporary support system to the largest extent and the like.
Description
Technical field
The utility model relates to the constructing tunnel field, is specifically related to a kind of braced structures of hard rock large cross-section tunnel construction.
Background technology
Large cross-section tunnel mainly is meant railway, highway and subway tunnel usually, also makes a general reference excavated section at 40m
2Above tunnel is so as to the less tunnels such as hydraulic tunnel of difference section.Along with the lifting of national economy and the quickening of national basis Facilities Construction; Along with improving constantly of rapid economic development and technical level; The railway that China builds, highway and subway tunnel are more and more, and the construction in big section, extra-large cross-section tunnel is also more and more in the underground construction.
Because (spy) large cross-section tunnel excavation span is big and flat; Add repeatedly disturbance and supporting lining cutting many factors such as asynchronous construction each other of the influencing each other of many operations of construction period, country rock; Structure will be born bigger pressure from surrounding rock; Its stress condition is very complicated, and in work progress, unstability and even cave-in accident very easily take place country rock.Therefore, the construction and excavation method of (spy) large cross-section tunnel must the underground construction technician be considered double cautiously.
At present, generally adopt wall constructing process (CRD method) in double side wall pilot tunnel method and middle wall constructing process (CD method), the intersection for the construction of (spy) large cross-section tunnel.Interim support in these job practicess is vertically complete or vertical and horizontal use in the lump; And vertical interim the support extends to the tunnel cross-section bottom; For example, the interim method for supporting (as shown in Figure 1) of CD method is: side is wide open dig after, set up arch, tunnel steelframe and false stull 5 and perpendicular support 6; Make it in the side hole, to be connected into ring; Interim vertical support with the cross binding welding fixingly, vertical support need extend to tunnel bottom with excavation, and there is following deficiency in above-mentioned interim method for supporting: one) operation various, have a strong impact on construction speed; Two) the interim support is difficult for removing, and makes that its recycling rate of waterused is low, causes construction cost high; Blasting impact when three) relying on blast working owing to interim support is removed, so dependence demolition blasting fixed support in the hard rock tunnel, and is bigger to tunnel preliminary bracing even rock mass damage.
Chinese patent CN101769154A discloses a kind of excavation supporting method of constructing tunnel, and this method adopts the temporary lining of cross steelframe on three bench excavation method bases, and this supporting is easier to operation, has shortened the construction period with respect to the interim support of above-mentioned CD method; But its interim vertical steel frame support still extends to the tunnel cross-section bottom; The interim support difference of its essence and CD method is little, has increased working procedure equally, and is difficult for removing; The preliminary bracing that destructible has been constructed during dismounting; In addition, top bar in this excavation supporting method to adopt and once excavate moulding, though can make the arch of topping bar once reach the design profile requirement; In time accomplish preliminary bracing, but the construction that its country rock that is not suitable for poor stability and high brokenness is a large cross-section tunnel.
The utility model content
It is loaded down with trivial details, slow that the main purpose of the utility model is intended to solve in (spy) big section hard rock multistep Excavation Blasting the supporting operation; Temporary lining is torn explosion open and is destroyed problems such as big, provide a kind of simple in structure, construction speed fast, construction safety, maximizing ground reduce be used for the braced structures that hard rock large cross-section tunnel construct of hard rock blasting to the destruction of temporary lining system.
The above-mentioned technical purpose of the utility model is achieved by the following technical programs: a kind of supporting construction of hard rock large cross-section tunnel construction; Comprise preliminary bracing, the interim support, it is characterized in that: said interim support is vertically supported the vertically interim support that links to each other with preliminary bracing with the tunnel vault and is formed temporarily by many; Said vertical interim stays at the tunnel centerline between tunnel vault and the tunnel spring line, on the rock that its bottom support is not excavated at the spring line place.
The vertical of the utility model is supported on the rock that does not excavate at the springing line place temporarily, need not to extend to the tunnel cross-section bottom, so the described half leg formula that temporarily is supported for of the utility model, and interim support of this half leg formula only brought into play interim supporting role when partial excavation.Therefore; This interim support not only can provide the stability of section country rock; And can simplify the big section blast working worker method of hard rock (spy); Simultaneously reduce the destruction of hard rock blasting substantially, solved hard rock (spy) large cross-section tunnel blast working complex procedures, temporary lining and torn the big problem of explosion destruction open the temporary lining system.
As preferably, said vertical interim the support with vertical interim the support flexibly connects, but not welding is easy to remove, and helps reducing down step rock blasting excavation to the destruction of existing preliminary bracing.
As preferably, said vertical interim support base use concrete strengthening, so that support base firm supporting temporarily.
As preferably, said adjacent vertical interim to support longitudinal pitch be 1m.
As preferably; Said vertical interim the support with said vertically interim the support is the I-steel steelframe; The I-steel model can be selected based on character such as country rock rank and stability, edpth of tunnel, spans, wherein vertical interim suitable any I-steel steelframe in I22A, I22B, I24A, the I24B type of selecting for use that supports; Vertically interim the support suits to select for use any I-steel steelframe in I18, I20A, the I20B type.
In sum, the utility model compared with prior art has following outstanding advantage and beneficial effect:
1, the half leg formula that temporarily is supported in the utility model not only helps the stability of section country rock, and can simplify the big section blast working worker method of hard rock (spy), reduces the destruction of hard rock blasting to the temporary lining system simultaneously substantially;
2, the interim support of the utility model can reduce the influence of rock blasting to existing preliminary bracing; Since the vertical interim flexible connection of supporting and vertically be supported for temporarily, the convenient dismounting, thereby but accelerating construction progress; Calculate by full section; Average every month comprehensive drilling depth of the present invention can reach 75m, and existing double side wall pilot tunnel method, CD method and CRD method, average every month maximum drilling depths are about 40m;
3, the temporary support structure in the utility model is simple, easy to operate, and construction sequence is brief, and helps constructing structure safety, can be applied in (spy) big section piecemeal blast working, reaches the effect of safe and simple construction;
4, the utility model can be used for (spy) large cross-section tunnel, especially span greater than 22 meters extra-large cross-section tunnel and country rock rank in the blast working of the hard rock tunnel of I ~ IV level.
Description of drawings
Fig. 1 is the structure cross-sectional drawing of CD method;
Fig. 2 is the structure and the working procedure cross-sectional drawing thereof of the utility model;
Fig. 3 is the interim support skiagraph of the utility model;
Fig. 4 is the A enlarged drawing of Fig. 2;
Wherein, 1 is preliminary bracing, and 2 is interim the support, and 3 is vertical interim the support, and 4 is vertically interim the support; 5 is false stull, and 6 is interim perpendicular support, and 7 for topping bar in the left side, and 8 is step in the left side; 9 for topping bar on the right side, step in 10 right sides, and 11 is the inverted arch left part, 12 is the inverted arch right portions.
The specific embodiment
Below in conjunction with embodiment the utility model is done further explain.
Like Fig. 2 and shown in Figure 4, the support that is used for excavating, it comprises preliminary bracing 1, supports 2 temporarily, supports 2 temporarily and is supported 3 and formed with the vertically interim support 4 that links to each other with the preliminary bracing 1 of tunnel vault by vertical interim; On the rock that the wherein vertical interim 3 tunnel centerline be located between tunnel vault and the tunnel springing line that support, its bottom support are not excavated at the springing line place, be half leg formula.Vertical support 3 temporarily is respectively I22B I shape and I20A I shape steelframe with vertical interim support 4, and both flexibly connect, and are convenient to dismounting, and adjacent vertically interim support 3 longitudinal pitches are 1m, and are as shown in Figure 3.
As shown in Figure 2, the step of the job practices of enforcement the utility model said structure is following:
(1) the excavation left side tops bar 7, executes and does left side preliminary bracing 1, and 7 constructions, 20 ~ 30m tops bar in the left side;
(2) execute the middle temporary lining 2 of do: float stone on the 7 bottom basement rock of topping bar on the left of the cleaning; Again in the bottom basement rock near the position of tunnel center line longitudinal pitch to be installed be the vertical I22B i iron 3 of 1m; At vertical I22B i iron 3 tops vertical I20A i iron 4 is installed; Vertically I20A i iron 4 is connected left side top preliminary bracing 1 with the interim support 3 of vertical I22B, and I22B i iron 3 leans below top preliminary bracing 1, and it is to connect naturally; Purpose is to make things convenient for right side 9 blast workings of topping bar, and reduces the destruction to the existing preliminary bracing in left side;
(3) at vertical I22B i iron 3 bottom lock foot anchoring stocks, hang reinforced mesh, spray the C20 concrete, excavating step 8 in the left side apart from center line 800mm place, tunnel then, construction 10 ~ 20m;
(4) the excavation right side tops bar 9, executes then and does preliminary bracing (not drawing among the figure), and 9 constructions, 20 ~ 30m tops bar on the right side;
(5) step 10 in the tunneling right side;
(6) carry out the excavation of bottom left-hand section 11 and inverted arch right portions 12, and execute and do preliminary bracing (not drawing among the figure), make preliminary bracing seal into ring, whole operation is accomplished.
This specific embodiment only is the explanation to the utility model; It is not the restriction to utility model; Those skilled in the art can make any modification to present embodiment as required after reading this manual, but as long as in the claim scope of the utility model, all receive the protection of Patent Law.
Claims (7)
1. the braced structures of hard rock large cross-section tunnel construction; Comprise preliminary bracing (1), interim support (2), it is characterized in that: said interim support (2) is made up of with the vertically interim support (4) that links to each other with the preliminary bracing (1) of tunnel vault many vertically interim support (3); The tunnel centerline between tunnel vault and the tunnel springing line is located in said vertical interim support (3), on the rock that its bottom support is not excavated at the springing line place.
2. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 1 is characterized in that: said vertical support (3) temporarily and vertically interim support (4) flexible connection.
3. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 2 is characterized in that: concrete strengthening is used in said vertical interim (3) bottom of supporting.
4. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 1 is characterized in that: said adjacent vertical interim support (3) longitudinal pitch is 1m.
5. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 1 is characterized in that: said vertical temporarily support (3) are the i iron steelframe with said vertically interim support (4).
6. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 5 is characterized in that: said vertical interim support (3) are selected any i iron steelframe in I22A, I22B, I24A, the I24B type for use.
7. the braced structures of a kind of hard rock large cross-section tunnel construction according to claim 5 is characterized in that: any i iron steelframe in I18, I20A, the I20B type is selected in said vertically interim support (4) for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203122318U CN202215268U (en) | 2011-08-25 | 2011-08-25 | Supporting structure for construction of hard rock large-section tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203122318U CN202215268U (en) | 2011-08-25 | 2011-08-25 | Supporting structure for construction of hard rock large-section tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202215268U true CN202215268U (en) | 2012-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203122318U Withdrawn - After Issue CN202215268U (en) | 2011-08-25 | 2011-08-25 | Supporting structure for construction of hard rock large-section tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202215268U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305091A (en) * | 2011-08-25 | 2012-01-04 | 中铁十六局集团有限公司 | Support structure for hard rock large-section tunnel construction, and construction method for support structure |
| CN102704939A (en) * | 2012-06-26 | 2012-10-03 | 中国建筑第五工程局有限公司 | Combined steel temporary supporting excavation method for tunnel with extra-large section |
-
2011
- 2011-08-25 CN CN2011203122318U patent/CN202215268U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305091A (en) * | 2011-08-25 | 2012-01-04 | 中铁十六局集团有限公司 | Support structure for hard rock large-section tunnel construction, and construction method for support structure |
| CN102704939A (en) * | 2012-06-26 | 2012-10-03 | 中国建筑第五工程局有限公司 | Combined steel temporary supporting excavation method for tunnel with extra-large section |
| CN102704939B (en) * | 2012-06-26 | 2014-10-01 | 中国建筑第五工程局有限公司 | Combined steel temporary supporting excavation method for tunnel with extra-large section |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120509 Effective date of abandoning: 20130911 |
|
| RGAV | Abandon patent right to avoid regrant |