CN211038688U - Supporting structure for salt rock tunnel - Google Patents
Supporting structure for salt rock tunnel Download PDFInfo
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- CN211038688U CN211038688U CN201921720829.3U CN201921720829U CN211038688U CN 211038688 U CN211038688 U CN 211038688U CN 201921720829 U CN201921720829 U CN 201921720829U CN 211038688 U CN211038688 U CN 211038688U
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- waterproof layer
- layer
- waterproof
- secondary lining
- supporting structure
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Abstract
The utility model discloses a supporting structure for a rock salt tunnel, which comprises a primary support, a waterproof layer and a secondary lining; the primary support comprises an anchor spraying net arranged on the outer layer, a full-ring steel frame and a water-resisting layer on the inner layer; the waterproof layer comprises a waterproof layer arranged between the primary support and the waterproof layer and a waterproof layer arranged between the waterproof layer and the secondary lining; the utility model discloses set up multiple waterproof construction, optimize the bearing capacity that has improved supporting construction.
Description
Technical Field
The utility model relates to an underground works field of strutting, concretely relates to a supporting construction for rock salt tunnel.
Background
The current salt rock formations are mostly used for underground storage of energy oil and natural gas and underground disposal of waste nuclear waste and toxic garbage and carbon dioxide. However, as railway construction in China is vigorously developed, various complex stratums can be encountered in the construction process of the tunnel. When the tunnel engineering is located in a sand-mud rock stratum with a stone salt, gypsum and anhydrite interlayer, once the hydrogeological environment is changed after the engineering is built, the underground water causes the easily soluble chemical deposition layer to be corroded, and slightly generates corrosion holes. And the stress conditions of the tunnel base and the surrounding rock are reduced. In severe areas, leaching solutions of halite, gypsum and anhydrite have strong chemical corrosivity and expansibility on concrete and steel structures. The waterproof lining structure of the tunnel is damaged by expansion and corrosion, the strength is reduced, the concrete lining is damaged like a bean curd residue sample, and once the disease is cured, the difficulty is high. Meanwhile, after the halite, gypsum and anhydrite in the surrounding rock behind the secondary lining are dissolved in underground water and drained away, cavities and cracks are easily formed, so that the surrounding rock is further crushed, disintegrated and even unstable, the strength and the self-stability are reduced, the pressure around the cavity acting on the secondary lining is increased, and the surrounding rock is resisted for a long time to deform and damage.
The construction operation risk of the tunnel crossing the rock salt stratum is high, and the long-term safety stability of the structure is poor. However, at present, no supporting structure specially used for salt rock tunnel construction exists.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can guarantee a supporting construction for salt rock tunnel of tunnel in salt rock stratum safe operation.
The utility model adopts the technical proposal that: a supporting structure for a rock salt tunnel comprises a primary support, a waterproof layer and a secondary lining; the primary support comprises an anchor spraying net arranged on the outer layer, a full-ring steel frame and a water-resisting layer on the inner layer; the waterproof layer comprises a waterproof layer arranged between the waterproof layer and the primary support and a waterproof layer arranged between the waterproof layer and the secondary lining.
Further, the full-ring steel frame comprises a full-ring grid steel frame arranged in the sprayed concrete, a first foot locking anchor rod arranged at an arch foot and a second foot locking anchor rod arranged at a wall foot; the anchor spraying net comprises a reinforcing mesh arranged at the arch wall.
Further, the grid steel frame comprises two main ribs arranged oppositely and a construction steel bar arranged between the two main ribs.
Further, the waterproof layer is of a concrete structure, the tunnel bottom is 2m thick, and the rest positions are 25cm thick; the waterproof layer between the waterproof layer and the primary support and the waterproof layer arranged between the waterproof layer and the secondary lining are composed of a spraying layer, geotextile and a waterproof board.
Further, the waterproof board is an EVA board.
Further, the waterproof layer is rubber asphalt.
Furthermore, the cross section of the secondary lining is of a circular structure, the secondary lining is made of C50 corrosion-resistant reinforced concrete, and the surface of the steel bar is provided with an epoxy resin anticorrosive coating.
Further, a stress sensor is arranged, the stress sensor is connected with a control device, and the control device is connected with an alarm device.
The utility model has the advantages that:
(1) the utility model adopts multiple waterproof and anticorrosive measures to avoid the damage of leaching liquid of underground water, halite, gypsum and anhydrite to the supporting structure;
(2) the utility model is provided with an alarm device to ensure the safe operation of the tunnel in the salt rock stratum;
(3) the utility model discloses optimize section structure, fully optimize the bearing capacity who improves supporting construction.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the middle full-ring steel frame of the present invention.
Fig. 3 is a schematic view of the grid steel frame structure of the present invention.
Fig. 4 is the structure schematic diagram of the secondary lining of the utility model.
Fig. 5 is the schematic diagram of the excavation flow of the utility model.
In the figure: 1-grid steel frame, 2-first foot locking anchor rod, 3-second foot locking anchor rod, 4-secondary lining reinforcing steel bar, 5-upper step, 6-middle step, 7-lower step, 8-base, 9-water-resisting layer, 10-inverted arch and 11-inverted arch filling.
Detailed Description
As shown in fig. 1 to 5, a supporting structure for a rock salt tunnel comprises a primary support, a waterproof layer and a secondary lining; the primary support comprises an anchor spraying net arranged on the outer layer, a full-ring steel frame and a water-resisting layer on the inner layer; the waterproof layer includes a waterproof layer provided between the waterproof layer 9 and the preliminary bracing and a waterproof layer provided between the waterproof layer 9 and the secondary lining. The full-ring steel frame comprises a full-ring grid steel frame 1 arranged in the sprayed concrete, a first foot locking anchor rod 2 arranged at an arch foot and a second foot locking anchor rod 3 arranged at a wall foot; the anchor spraying net comprises a reinforcing mesh arranged at the arch wall. The sprayed concrete is C25 corrosion-resistant concrete, and the dosage of the corrosion-resistant agent is 12% of the dosage of the cement. The concrete of the water-resisting layer 9 is C45 corrosion-resistant concrete, and the impervious grade is not lower than P10. The water-barrier layer 9 comprises a C45 concrete structure with the thickness of 2m of the tunnel bottom and a C45 concrete structure with the rest position of 25 cm.
The grid steel frame 1 comprises two main bars arranged oppositely and a construction steel bar arranged between the main bars. The grid steel frame of the arch part is assembled by 5 steel frames, and during actual construction, the grid steel frame is fixed by two first foot locking anchor rods 2 arranged at the arch feet. The grid steel frame 1 at the inverted arch is composed of three steel frames. The grid steel frame 1 is anticorrosive by adopting an epoxy resin coating, and the steel frame adopts a mode of prefabricating outside a hole and assembling inside the hole. The main reinforcement of grid steelframe 1 adopts the C25 reinforcing bar, and the constructional reinforcement includes C14 and A10 reinforcing bar, and bolted connection is adopted in the concatenation of grid steelframe 1.
The waterproof layer between the waterproof layer 9 and the preliminary bracing and the waterproof layer arranged between the waterproof layer 9 and the secondary lining are composed of a spraying layer, geotextile and a waterproof board, the waterproof layer is rubber asphalt, and the thickness of the rubber asphalt is 2 mm. The waterproof board is an EVA board.
The cross section of the secondary lining is of a circular structure, the secondary lining is made of C50 corrosion-resistant reinforced concrete, and the surface of the steel bar is provided with an epoxy resin anticorrosive coating. Besides water resistance and corrosion resistance, the support structure is prevented from being damaged due to sudden increase of surrounding rock pressure; the circular section has the best stress effect, and the tunnel base is filled with C45 corrosion-resistant concrete and is subjected to grouting treatment by the sleeve valve pipe at the base. The replacement depth is 0.5-1 m according to the content of the salt rock (the replacement depth is 0.5m when the content of the salt rock is less than 30%, and is 1m when the content of the salt rock is more than 30%). Sleeve valve tube adoption
Rigid sleeve valve tubes, with a spacing of 1m × 1m (circumferential × longitudinal direction), and a reinforcement depth of 10m below the base.
And a stress sensor is arranged in the secondary lining and connected with a control device, and the control device is connected with an alarm device. The control device judges whether the stress detected by the stress sensor is within a preset range, and if the stress detected by the stress sensor is within the preset range, the control device does not act; if the pressure exceeds the preset range, a signal is transmitted to the alarm device, the alarm is given out to prevent the pressure around the cave from suddenly increasing due to the dissolution of the salt rock, the early warning is carried out on the secondary lining, and the construction safety is ensured.
The underground water is gathered at the side wall and the inverted arch, the cracking and the damage of the supporting structure are generated at the side wall and the inverted arch, the underground water and the concrete structure are isolated and the surrounding rock is reinforced in the actual use process, the arch wall adopts phi 42 steel flower pipes for radial grouting, the distance is 1m × 1m, the distance is 5m, the arch wall is arranged in a staggered mode, the base adopts sleeve valve pipes for grouting, the distance is 1m × 1m, the grouting depth is 10m, and the grouting material adopts cement paste or superfine cement paste (when the content of the salt rock is more than 30 percent, the superfine cement paste is adopted).
The excavation process is shown in figure 5 and,
step 1: weak blasting excavation of the upper step 5 is carried out, primary support around the upper step 5 is carried out, namely, concrete with the thickness of 4cm is sprayed initially, a reinforcing mesh is laid, a steel frame is erected, and a foot locking anchor pipe is arranged. And drilling a radial anchor pipe, and after grouting, re-spraying concrete to the designed thickness.
Step 2: if 6 middle steps are blasted, the peripheral part of the steps is sprayed with concrete with the thickness of 4cm, a reinforcing mesh is laid, a steel frame is erected, and a foot locking anchor rod is arranged. And drilling a radial anchor pipe, and after grouting, re-spraying concrete to the designed thickness.
And step 3: after lagging the middle step 6 for a distance, weak blasting excavates the lower step 7. And (5) applying the base and spraying concrete. The lengthening steel frame is provided with a tunnel bottom steel frame and a foot locking anchor rod.
And 4, step 4: and (4) according to the analysis of the monitoring measurement result, after the primary support is converged, removing the temporary cross brace. Filling 8 parts of foundation with concrete, spraying the inverted arch bottom and waterproof layer of waterproof board.
And 5: the concrete of the water-resisting layer 9 is poured and used as a spraying and waterproof board waterproof layer.
Step 6: the inverted arch 10 and the side wall foundation are poured.
And 7: fill the invert fill 11 to design height.
And 8: and (5) pouring the arch wall lining at one time by using the lining template trolley.
The utility model is suitable for a salt rock tunnel is strutted, has fully considered the strong corrosivity of salt rock stratum to supporting construction, adopts multiple waterproof and anticorrosive structure. The damage of the leaching liquid of underground water, halite, gypsum and anhydrite to the supporting structure is avoided. And the bearing capacity of the supporting structure is improved through section structure optimization, and the safe operation of the tunnel in the rock salt stratum is ensured.
Claims (8)
1. A supporting structure for a rock salt tunnel is characterized by comprising a primary support, a waterproof layer and a secondary lining; the primary support comprises an anchor net spray arranged on the outer layer, a full-ring steel frame and a water-resisting layer on the inner layer; the waterproof layer comprises a waterproof layer arranged between the primary support and the waterproof layer (9) and a waterproof layer arranged between the waterproof layer (9) and the secondary lining.
2. A support structure for a salt rock tunnel according to claim 1, characterized in that the full ring steel frame comprises a full ring of grid steel frames (1) arranged in shotcrete, first foot-locking bolts (2) arranged at the arch foot and second foot-locking bolts (3) arranged at the wall foot; the anchor spraying net comprises a reinforcing mesh arranged at the arch wall.
3. A support structure for a salt rock tunnel according to claim 2, characterized in that the grid steel frame (1) comprises two main bars arranged oppositely and construction steel bars arranged between the main bars.
4. The supporting structure for a salt rock tunnel according to claim 1, characterized in that the water-resisting layer (9) is a concrete structure, the tunnel bottom is 2m thick, and the rest positions are 25cm thick; the waterproof layer between the waterproof layer (9) and the primary support and the waterproof layer arranged between the waterproof layer (9) and the secondary lining are composed of a spray coating layer, geotextile and a waterproof board.
5. The supporting structure for a salt rock tunnel of claim 4, characterized in that the waterproof sheet of the water-stop layer (9) is an EVA sheet.
6. The supporting structure for a rock salt tunnel according to claim 5, wherein the waterproof layer is rubber asphalt.
7. The supporting structure for the salt rock tunnel of claim 1, wherein the cross section of the secondary lining is a circular structure, the secondary lining is made of C50 corrosion-resistant reinforced concrete, and the surface of the steel bar is provided with an epoxy resin anticorrosive coating.
8. The supporting structure for the salt rock tunnel according to claim 1, wherein a stress sensor is arranged in the secondary lining, the stress sensor is connected with a control device, and the control device is connected with an alarm device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921720829.3U CN211038688U (en) | 2019-10-15 | 2019-10-15 | Supporting structure for salt rock tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921720829.3U CN211038688U (en) | 2019-10-15 | 2019-10-15 | Supporting structure for salt rock tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211038688U true CN211038688U (en) | 2020-07-17 |
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ID=71566356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921720829.3U Expired - Fee Related CN211038688U (en) | 2019-10-15 | 2019-10-15 | Supporting structure for salt rock tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211038688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046159A (en) * | 2022-01-13 | 2022-02-15 | 中铁五局集团第一工程有限责任公司 | Template part and construction method for excavating and lining tunnels in loess-rich stratum |
-
2019
- 2019-10-15 CN CN201921720829.3U patent/CN211038688U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046159A (en) * | 2022-01-13 | 2022-02-15 | 中铁五局集团第一工程有限责任公司 | Template part and construction method for excavating and lining tunnels in loess-rich stratum |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200717 Termination date: 20211015 |