CN211448710U - Reusable temporary inverted arch structure for primary support of soft rock tunnel - Google Patents
Reusable temporary inverted arch structure for primary support of soft rock tunnel Download PDFInfo
- Publication number
- CN211448710U CN211448710U CN201921753460.6U CN201921753460U CN211448710U CN 211448710 U CN211448710 U CN 211448710U CN 201921753460 U CN201921753460 U CN 201921753460U CN 211448710 U CN211448710 U CN 211448710U
- Authority
- CN
- China
- Prior art keywords
- inverted arch
- steel
- temporary inverted
- tunnel
- plate
- 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
Images
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
A reusable temporary inverted arch structure for primary support of a soft rock tunnel comprises a main framework, wherein a steel structure temporary inverted arch comprises a temporary inverted arch main framework formed by two channel steel, a temporary inverted arch panel formed by an upper steel plate and a lower steel plate and a side steel plate; the steel structure temporary inverted arch is longitudinally connected, a guide steel pipe is drilled through a channel steel web plate and welded, the longitudinal connecting steel pipe penetrates through the guide steel pipe, and the steel structure temporary inverted arch is connected with the steel pipe through a bolt; the bottom end of the primary support arch frame is supported on the temporary inverted arch of the steel structure by a base which is formed by welding a side wing plate, a bottom wing plate and a web plate. And (5) along with the tunneling of the tunnel, detaching the temporary inverted arch at the rear side and installing the temporary inverted arch at the front side, and repeating the circulation. The structure can be repeatedly used, the cost is greatly saved, the concrete does not need to be sprayed, the process cycle time can be saved, the engineering progress is improved, the effect is exerted in time, the sudden dangerous case handling is particularly favorable, the concrete is convenient to remove because the time restriction of the strength increase of the sprayed concrete does not exist, and the concrete does not need to be broken and dismantled.
Description
Technical Field
The utility model belongs to the technical field of tunnel construction, a surrounding rock and the supporting construction that produces subsides and the supporting construction who warp to soft rock tunnel construction control stress release is related to, concretely relates to a repeatedly usable's interim invert structure for soft rock tunnel preliminary bracing.
Background
The temporary inverted arch is the most effective measure for controlling the settlement deformation of the primary support of the soft rock tunnel, and is generally applied to the upper step and the middle step of the tunnel (namely, the position above the circle center of the cross section of the tunnel). The current popular practice in the field is as follows: the construction method has three problems that firstly, the bending moment value of the tunnel primary support structure after the temporary inverted arch is applied is increased compared with that before the temporary inverted arch is not applied; secondly, the temporary inverted arch constructed on site is usually dismantled within two days, so that the workload of dismantling the temporary inverted arch is very large, and the construction progress is influenced; thirdly, the cost is high, the existing construction budget is made for the section steel of the temporary inverted arch according to the reusability, and actually, the section steel frame of the temporary inverted arch is seriously deformed after being dismantled, so that the section steel frame is difficult to recycle. Due to the above three main reasons, the use of temporary inverted arches is severely restricted;
in general, the stress of the footing of the soft rock tunnel is 10 times or more the strength of the foundation, so that the deformation of the tunnel preliminary bracing is substantially mainly due to the settlement and the convergence is simultaneously caused by the settlement. Therefore, the support deformation is controlled only by controlling the settlement, so that the connection of the temporary inverted arch and the primary support is most ideal in a hinged mode, namely, the connection does not generate bending moment; the deformation caused by dismantling the temporary inverted arch is mainly generated when the sprayed concrete is broken and dismantled, so that the temporary inverted arch can be processed into a steel structure, the sprayed concrete is avoided, the construction and dismantling become very convenient, the real repeated use is realized, and the construction cost is greatly reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a reusable temporary inverted arch structure for the primary support of a soft rock tunnel, which can be reused and greatly save the cost; concrete does not need to be sprayed, so that the process cycle time can be saved, and the project progress can be improved; the method plays a role in time, and is particularly beneficial to treating sudden dangerous cases because the time restriction of the increase of the strength of the sprayed concrete is avoided; the dismantling is convenient, and concrete is not required to be dismantled.
In order to realize the purpose, the utility model discloses a technical scheme is:
a reusable temporary inverted arch structure for primary support of a soft rock tunnel comprises a main framework, wherein a steel structure temporary inverted arch comprises a temporary inverted arch main framework formed by two channel steel, a temporary inverted arch panel formed by an upper steel plate and a lower steel plate and a side steel plate; the steel structure temporary inverted arch is longitudinally connected, a guide steel pipe is drilled through a channel steel web plate and welded, the longitudinal connecting steel pipe penetrates through the guide steel pipe, and the steel structure temporary inverted arch is connected with the steel pipe through a bolt; the bottom end of the primary support arch frame is supported on the temporary inverted arch of the steel structure by a base which is formed by welding a side wing plate, a bottom wing plate and a web plate.
The length of the longitudinal connecting steel pipe is about 1 m greater than that of the tunnel excavation step.
The connection of the steel structure temporary inverted arch and the tunnel primary support is only contact connection instead of welding connection, and the steel structure temporary inverted arch is connected with the primary support steel frame bottom welding base through the primary support steel frame.
The utility model has the advantages that:
1. the material can be repeatedly used, so that the cost is greatly saved;
2. concrete does not need to be sprayed, so that the process cycle time can be saved, and the project progress can be improved;
3. the method plays a role in time, and is particularly beneficial to treating sudden dangerous cases because the time restriction of the increase of the strength of the sprayed concrete is avoided;
4. the demolition is convenient, and concrete is not required to be demolished.
Drawings
FIG. 1 is a schematic view of the structure of the upright face of the tunnel primary support of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line B-B of the present invention;
fig. 3 is a schematic top view of a partial structure of the present invention;
fig. 4 is the utility model discloses interim invert is connected the schematic diagram with preliminary bracing steelframe.
Wherein, 1 is a main framework; 2 is a temporary inverted arch panel; 3 is a side steel plate; 4, a guide steel pipe; 5 is a steel pipe; 6 is a bolt; 7 is a side wing plate; 8 is a bottom wing plate; 9 is a web.
Detailed Description
The present invention will be further described with reference to the accompanying drawings;
as shown in fig. 1, 2, 3 and 4, a reusable temporary inverted arch structure for soft rock tunnel preliminary bracing comprises a main framework 1, a steel structure temporary inverted arch is composed of a temporary inverted arch main framework 1 composed of two channel steel, a temporary inverted arch panel 2 composed of upper and lower steel plates and a side steel plate 3; the steel structure temporary inverted arch is longitudinally connected through a channel steel web plate hole and a guide steel pipe 4 is welded, a longitudinal connecting steel pipe 5 penetrates through the guide steel pipe 4, and the steel structure temporary inverted arch is connected with the steel pipe 5 through a bolt 6; the bottom end of the primary support arch is supported on the temporary inverted arch of the steel structure by a base which is formed by welding a side wing plate 7, a bottom wing plate 8 and a web plate 9.
The length of the longitudinal connecting steel pipe 5 is about 1 m greater than that of the tunnel excavation step.
The temporary inverted arch is connected with the primary support of the tunnel only in a contact mode instead of a welding mode, and the temporary inverted arch is connected with the temporary inverted arch through a welding base at the bottom end of a primary support steel frame.
The temporary inverted arch is designed according to the section of the primary support of the constructed tunnel, the radius of the temporary inverted arch is generally the same as that of the inverted arch of the primary support of the tunnel, and the width of the inverted arch is the same as the distance between steel frames of the primary support of the tunnel; the number of the trusses is determined by the length of the tunnel excavation step; the length of the longitudinal connecting steel pipe is greater than that of the tunnel step; the temporary inverted arch is processed and manufactured in a factory and is installed on site; and the support base connected with the temporary inverted arch is welded at the bottom of the tunnel primary support steel frame.
The temporary inverted arch is generally arranged at the upper and middle step positions of the tunnel and is installed together with the primary support steel frame of the tunnel. In particular, the temporary inverted arch arranged on the upper step of the tunnel has a very good effect on controlling the loosening deformation of the surrounding rock, which is proved by the construction practice of countless 'mining method' tunnels. Therefore, the common soft rock tunnel does not need advanced support, which is the advantage that the temporary inverted arch has convenient construction and cost; if the longitudinal connection quality of the tunnel primary support is reliable and the early strength of the sprayed concrete is guaranteed, all anchor rods (including the system and the anchor rod with the locking feet) can be eliminated (because the length of the anchor rods designed for the tunnel primary support is located in the tunnel surrounding rock sliding body at present, all the anchor rods do not work any more after the tunnel primary support is closed), and the tunnel primary support has the advantage of convenience in construction and cost.
Along with the tunneling of the tunnel, the temporary inverted arch at the rear side is dismantled and installed at the front side, and the circulation is repeated; the temporary inverted arch bottom foundation is required to be compact and not to have holes or loose slag.
Claims (3)
1. A reusable temporary inverted arch structure for primary support of a soft rock tunnel comprises a main framework (1), and is characterized in that a steel-structure temporary inverted arch is composed of a temporary inverted arch main framework (1) formed by two channel steel beams, a temporary inverted arch panel (2) formed by an upper steel plate and a lower steel plate and a side steel plate (3); the steel structure temporary inverted arch is longitudinally connected, a guide steel pipe (4) is drilled through a channel steel web and welded, a longitudinal connecting steel pipe (5) penetrates through the guide steel pipe (4), and the steel structure temporary inverted arch is connected with the steel pipe (5) through a bolt (6); the bottom end of the primary support arch is supported on the temporary inverted arch of the steel structure by a base which is formed by welding a side wing plate (7), a bottom wing plate (8) and a web plate (9).
2. The reusable temporary inverted arch structure for soft rock tunnel preliminary bracing according to claim 1, wherein the length of the longitudinal connecting steel pipe (5) is about 1 m longer than the length of the tunnel excavation step.
3. The reusable temporary inverted arch structure for the preliminary support of the soft rock tunnel according to claim 1, wherein the connection between the steel-structured temporary inverted arch and the preliminary support of the tunnel is only a contact connection rather than a welding connection, and the steel-structured temporary inverted arch is connected through a welding base at the bottom end of the steel frame of the preliminary support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921753460.6U CN211448710U (en) | 2019-10-18 | 2019-10-18 | Reusable temporary inverted arch structure for primary support of soft rock tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921753460.6U CN211448710U (en) | 2019-10-18 | 2019-10-18 | Reusable temporary inverted arch structure for primary support of soft rock tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211448710U true CN211448710U (en) | 2020-09-08 |
Family
ID=72313748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921753460.6U Active CN211448710U (en) | 2019-10-18 | 2019-10-18 | Reusable temporary inverted arch structure for primary support of soft rock tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211448710U (en) |
-
2019
- 2019-10-18 CN CN201921753460.6U patent/CN211448710U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109209392B (en) | Full-ring excavation method suitable for IV-V-grade surrounding rock of large-section tunnel | |
| CN108868834B (en) | Temporary support device for tunnel arch wall primary support intrusion limit arch changing construction | |
| CN101539021B (en) | Road tunnel excavation method | |
| CN110821513A (en) | Construction method for performing advanced grouting and supporting on tunnel local collapse | |
| CN201025038Y (en) | Adjustable pre-stress steel arch frame | |
| CN107762529A (en) | Lateral Hole and tunnel main tunnel infall construction method based on gib system | |
| CN210068174U (en) | Large deformation section supporting structure of carbon slate tunnel | |
| CN203742611U (en) | Strengthening supporting structure for opening ingate on side wall of tunnel under preliminary supporting condition | |
| CN203559904U (en) | Reinforced supporting structure for creating horsehead on reversal borehole wall shaft well side wall | |
| CN110645022A (en) | Self-anchored formwork support system for connecting channel and construction method | |
| CN109958454A (en) | Stope drift active workings pucking control system and its control method | |
| CN211448710U (en) | Reusable temporary inverted arch structure for primary support of soft rock tunnel | |
| CN112502730A (en) | Steel arch frame for preventing collapse of roadway at underground rock crushing section and supporting method thereof | |
| CN116464453A (en) | Construction method for quick turning of hard rock tunnel through one-time roof picking | |
| CN205977241U (en) | A steel shotcrete for native tunnel | |
| CN110230496A (en) | A kind of three step of big cross section soft stratum tunnel, four step is interlocked construction method | |
| CN113944479B (en) | Poor geological tunnel three-fork construction method | |
| CN109751062A (en) | One kind facing sky fender Floor Heave in Roadway control method | |
| CN215170074U (en) | Tunnel preliminary bracing arch-changing supporting structure | |
| CN108915735A (en) | Slopes wall construction method for supporting and slopes wall support system | |
| CN212375879U (en) | Combined foundation pit supporting beam string | |
| CN210919126U (en) | Tunnel preliminary bracing arch-changing supporting structure | |
| CN114135315A (en) | Advanced stress release construction method for severe large-deformation tunnel | |
| CN209925009U (en) | Connecting block in tunnel invert steelframe gap | |
| CN112682048A (en) | Replacement and reinforcement construction method for newly-built tunnel to span existing tunnel at small clear distance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |