CN209924998U - Shallow earthing shield tunnel is worn road reinforcement protection architecture down - Google Patents
Shallow earthing shield tunnel is worn road reinforcement protection architecture down Download PDFInfo
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- CN209924998U CN209924998U CN201920604672.1U CN201920604672U CN209924998U CN 209924998 U CN209924998 U CN 209924998U CN 201920604672 U CN201920604672 U CN 201920604672U CN 209924998 U CN209924998 U CN 209924998U
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Abstract
Shallow earthing shield tunnel is worn road reinforcement protection architecture down. The reinforcing protection structure comprises a grouting reinforcement layer formed by performing WSS drilling and grouting on soil above a tunnel range below a road from above the existing road before the shield tunnel is constructed, and a plurality of plain concrete underground continuous walls on two sides of the existing road above the shield tunnel, wherein the plurality of plain concrete underground continuous walls are distributed above the tunnel along a construction line of the shield tunnel; after the construction of the shield tunnel is completed, a grouting reinforcement layer formed by grouting through a grouting hole reserved in the shield tunnel to soil mass in the range of 120 degrees at the top of the shield tunnel below the existing road by using a tunnel inner sleeve valve pipe, and a plurality of expanding anchor rods at the bottom of the shield tunnel right below the existing road. The utility model discloses simple structure, construction convenience can guarantee the safety and stability of road and facility are built on ground to greatly reduce later stage tunnel and road operation and influence each other and tunnel come-up risk.
Description
Technical Field
Shallow earthing shield tunnel is worn road reinforcement protection architecture down belongs to urban rail transit engineering field.
Background
As the infrastructure construction of China enters the stage of white-fever, the urban rail transit construction can be continuously and rapidly developed along with the wave tide of the infrastructure, but the underground construction condition is complex, the geological condition, the hydrological condition, the ground condition, the pipeline condition and the like are all factors influencing the selection of subway tunnel lines, especially under the conditions of large ground traffic, less than one time of the thickness of the covering soil, weak covering soil layer and large water content, the shield tunneling machine passes through the existing road, the shield tunneling machine causes safety risks to the passing vehicles of the existing road in the process of shallow covering soil tunneling, and the shield tunneling machine has risks of mutual influence of the tunnel and the road operation after the shield tunneling machine passes through the existing road and shallow floating of the tunnel.
In addition, due to the influence of underground space, underground environment and construction requirements, the shield tunnel earth thickness is smaller and smaller in shield construction, when the shield tunnel earth thickness is smaller than one time of the diameter, the tunnel anti-floating measure also becomes a technical problem in the shield construction process, however, no clear specification exists at present in China, the shield tunnel earth thickness is still in a discussion and summary stage while construction is carried out, and theoretical research lags behind the development requirement of engineering construction, so that the technical research analysis and experience exchange of shield shallow earth-covered tunneling ensures the safety of the existing building, and has extremely high economic benefit and social benefit.
Disclosure of Invention
The utility model discloses according to prior art's not enough, a cross road reinforcement protection architecture under shallow earthing shield tunnel is provided, this protection architecture is applicable to the shield tunnel under the shallow earthing operating mode and passes through, can guarantee the safety and stability of road and facility are built on ground to greatly reduce later stage tunnel and road operation and influence each other and tunnel come-up risk.
In order to practice above-mentioned reinforced structure, the utility model provides a shallow earthing shield tunnel is worn road reinforcement protection architecture down, its characterized in that: the reinforcing protection structure comprises a grouting reinforcing layer arranged right below an existing road above the shield tunnel, a plurality of plain concrete underground continuous walls arranged on two sides of the existing road above the shield tunnel and a plurality of expansion anchor rods arranged at the bottom of the shield tunnel right below the existing road, wherein the grouting reinforcing layer comprises a WSS grouting reinforcing layer and a sleeve valve pipe grouting reinforcing layer above the grouting reinforcing layer; the WSS grouting reinforcement layer is formed by performing WSS drilling grouting on soil above a tunnel range below a road from above the existing road before shield tunnel construction, and the sleeve valve pipe grouting reinforcement layer is formed by reinforcing the soil at 120-degree range of the top of the shield tunnel below the existing road through a grouting hole reserved in the shield tunnel after the shield tunnel construction is completed; the multiple plain concrete underground continuous walls are constructed along the construction line of the shield tunnel before the shield tunnel is constructed, the distance between every two adjacent plain concrete underground continuous walls is 6-10 m, and the distance between the plain concrete underground continuous walls close to the two sides of the existing road and the existing road is 1-3 m; each expanded anchor rod is constructed from the bottom of the shield tunnel to a soil body below the shield tunnel after the shield tunnel construction is finished, and the length of the anchoring section of each expanded anchor rod is 0.8-2 m.
The utility model discloses better technical scheme: the distances among the multiple plain concrete underground continuous walls arranged on the two sides of the existing road are equal, the thickness of each plain concrete underground continuous wall (4) is 0.4-0.7 m, the depth of each plain concrete underground continuous wall extends to the two sides of the shield tunnel, and the depth of each plain concrete underground continuous wall extends to the two sides of the shield tunnel is 1/4-1/3 of the height of the shield tunnel.
The utility model discloses better technical scheme: the width of the WSS grouting reinforcement layer extends to 3-6 m of the two sides of the tunnel, cement slurry with a water-cement ratio of 1.2:1 is adopted for grouting reinforcement, and grouting pressure is controlled to be 0.6-1 Mpa.
The utility model discloses better technical scheme: the body-expanding anchor rod adopts novel pressure-bearing type body-expanding anchor rod, wherein one end uses small-size roofbolter to pass and buries in 3 ~ 5m in the soil body of tunnel below behind the shield tunnel section of jurisdiction preformed hole to inject cement paste and make its end embedding form the concretion body in cement paste reinforced soil body after burying underground and accomplishing, its injected cement paste is according to 400kg/m cement consumption injection quantity control, the other end of body-expanding anchor rod is fixed on the tunnel section of jurisdiction with high strength bolt and steel gasket, the concretion body compressive strength of every body-expanding anchor rod is about 35Mpa, the resistance to plucking bearing capacity is about 80 KN/root.
The utility model discloses better technical scheme: the sleeve valve pipe grouting pipe of the sleeve valve pipe grouting reinforcement layer adopts
The grouting pressure of the sleeve valve pipe is 0.4-3.5 MPa, and the grouting hole positions are distributed at the positions of 10 points, 11 points, 12 points, 1 point and 2 points above the two sides of the shield segment of the shield tunnel.
The utility model discloses better technical scheme: when the tunnel embedding depth is larger than 4m, the length of the plain concrete underground continuous wall is controlled to be 4m, and the upper part of the continuous wall is a hollow pile backfilled by clay.
Before the shield tunnel passes through, the utility model carries out WSS drilling grouting reinforcement on the soil body above the tunnel range below the road, thereby avoiding the settlement of the existing road in the process of passing the shield tunnel and endangering the traffic safety; meanwhile, a single plain concrete underground continuous wall is constructed in the range above tunnel lines on two sides of a road, so that a fixing effect is formed on the tunnel after a later shield passes through the tunnel to prevent the shallow earth covered tunnel from floating upwards and deviating; in the process of passing the shield, the shield is controlled to continuously and stably pass through the plain concrete underground diaphragm wall and the existing road through shield parameters, and after the shield passes through the grouting holes in the tunnel, the tunnel top below the existing road is reinforced by soil and the expanded anchor rod at the lower part of the tunnel by adopting the sleeve valve pipe in the tunnel within 120 degrees, so that the tunnel is prevented from floating upwards and deviating.
The utility model discloses the protection architecture of construction is applicable to the shield tunnel under the shallow earthing operating mode and passes through, and its simple structure, construction convenience can guarantee the safety and stability of road and facility are built on ground to greatly reduce later stage tunnel and road operation and influence each other and tunnel come-up risk.
Drawings
Fig. 1 is a schematic plan view of the present invention;
FIG. 2 is a cross-sectional view AA' of FIG. 1;
FIG. 3 is a cross-sectional view of a continuous wall location;
fig. 4 is a schematic illustration of reinforcement of the sleeve valve tube grout layer.
In the figure: the method comprises the following steps of 1-shield tunnel, 2-existing road, 3-WSS grouting reinforcement layer, 4-plain concrete underground continuous wall, 5-sleeve valve pipe grouting reinforcement layer and 6-expanded anchor rod.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. Embodiments are shown in fig. 1 to 4, and the following technical solutions shown in the drawings are specific solutions of the embodiments of the present invention, and are not intended to limit the scope of the claimed invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, or the orientation or positional relationship that a person skilled in the art conventionally understands, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The embodiment provides a shallow earthing shield tunnel is worn road and is consolidated protection architecture under, specifically as shown in fig. 1 and fig. 2, consolidate protection architecture including arranging in the slip casting back up layer under 1 of shield tunnel 1 top existing road 2, arranging in a plurality of plain concrete underground continuous walls 4 of 1 top existing road 2 both sides of shield tunnel and arranging in a plurality of expansion stock 6 of 1 bottom of shield tunnel under existing road 2, the slip casting back up layer includes WSS slip casting back up layer 3 and sleeve valve pipe slip casting back up layer 5 of top. The WSS grouting reinforcement layer 3 is formed by performing WSS drilling grouting on soil above a tunnel range below a road from above the existing road 2 before shield tunnel construction, the width of the WSS grouting reinforcement layer extends to 3-6 m of the two sides of the tunnel, cement slurry with a water-cement ratio of 1.2:1 is adopted for grouting reinforcement, and the grouting pressure is controlled to be 0.6-1 MPa. The sleeve valve pipe grouting reinforcement layer 5 is a grouting reinforcement layer formed by grouting the sleeve valve pipe in a hole in the 120-degree range of soil body at the top of the shield tunnel 1 below the existing road 2 through grouting holes reserved in the shield tunnel 1 after the shield tunnel construction is completed as shown in fig. 4, and the sleeve valve pipe grouting pipe of the sleeve valve pipe grouting reinforcement layer 5 is a sleeve valve pipe grouting pipe
The grouting pressure of the sleeve valve pipe is 0.4-3.5 MPa, and the grouting hole positions are distributed at the positions of 10 points, 11 points, 12 points, 1 point and 2 points above the two sides of the shield segment of the shield tunnel 1.
As shown in fig. 1, 2 and 3, in the embodiment, a plurality of plain concrete underground continuous walls 4 are constructed along the construction line of the shield tunnel 1 before the shield tunnel is constructed, the spacing between the two adjacent plain concrete underground continuous walls 4 is equal, the spacing between the two adjacent plain concrete underground continuous walls 4 is 6-10 m, and the spacing between the plain concrete underground continuous walls 4 close to the two sides of the existing road 2 and the existing road 2 is 1-3 m; the thickness of each plain concrete underground continuous wall 4 is 0.4-0.7 m, the depth extends to the two sides of the shield tunnel 1, and the depth extending to the two sides of the tunnel 1 is 1/4-1/3 of the height of the shield tunnel 1. As shown in fig. 2, after the shield tunnel construction is completed, a plurality of expanded anchor rods 6 are constructed from the bottom of the shield tunnel to the soil body below the shield tunnel, and the anchoring section length of each expanded anchor rod 6 is 0.8-2 m. One end part of each anchor rod is provided with a grouting hole, a small-sized anchor rod machine penetrates through a preformed hole of a shield tunnel segment and then is embedded into a soil body below the tunnel for 3-5m, cement paste is injected after embedding, so that an expanded anchor rod with an end embedded into cement paste reinforced soil is formed, the injection amount of the injected cement paste is controlled according to the cement consumption of 400kg/m, and the other end of the expanded anchor rod is fixed on the tunnel segment by a high-strength bolt and a steel gasket. The compressive strength of the stone body of each expansion anchor rod is about 35Mpa, and the pulling-resistant bearing capacity is about 80 KN/root.
It is right to combine the work progress below the utility model discloses it is further explained, this construction structures's specific work progress as follows:
(1) before the shield tunnel construction, WSS drilling and grouting reinforcement is carried out on soil above the tunnel range below the existing road 2, wherein cement slurry is adopted for WSS grouting reinforcement, the water cement ratio is 1.2:1, the grouting pressure is controlled to be 0.6-1Mpa, the grouting amount and the grouting pressure are strictly controlled in the grouting process, the grouting amount is ensured, special operation is carried out in the grouting process, ground uplift, cracking and slurry overflow caused by grouting are prevented, the grouting quality is ensured, and the condition that the existing road settlement endangers traffic safety in the shield underpass process is avoided; meanwhile, a single plain concrete underground continuous wall is constructed in the range above tunnel lines on two sides of a road, so that a fixing effect is formed on the tunnel after a later shield passes through the tunnel to prevent the shallow earth covered tunnel from floating upwards and deviating;
(2) after the shield passes through, the grouting holes in the tunnel are used for reinforcing the soil body by adopting the sleeve valve pipes in the tunnel to prevent the tunnel from floating upward and deviating, and particularly, the method adopts
The sleeve valve pipe is reinforced by grouting through soil bodies at the top of grouting holes in the directions of 10 points, 11 points, 12 points, 1 point and 2 points distributed on the two sides of the pipe piece, cement mortar is adopted as grouting slurry, the water-cement ratio is controlled to Be 0.8: 1-1.5: 1, the concentration of water glass is 30-40 Be, the volume ratio of the cement slurry to the water glass is preferably 1: 1-1: 0.5, the grouting pressure is 0.4-3.5 MPa, the grouting pressure is gradually increased, and when the ground or surrounding buildings are subjected to changes such as swelling and the likeStopping grouting; and the expanded anchor rod 6 is arranged at the bottom of the shield tunnel 1, and the drilling and the placement of the anchor body in the anchor rod construction process meet the related design requirements; the used slurry is micro-expansion mortar, and the reinforcement body is subjected to secondary grouting before the mortar is initially set, so that the strength of the stone body is ensured; after the stone body is solidified, the anchor rods are tensioned and locked, the anchor rod tensioning load stage observation time accords with relevant specifications, each anchor rod penetrates through a shield tunnel segment preformed hole by using a small anchor rod machine and then is embedded into a soil body below a tunnel for 3-5m, cement paste is injected after embedding is completed, the end of each anchor rod is embedded into the cement paste reinforced soil body, the anchoring section length of each expanded anchor rod 6 is 0.8-2 m, the compressive strength of the stone body is about 35Mpa, and the uplift bearing capacity is about 80 KN/root.
For the workers skilled in the art, various changes may be made in the above-described embodiments without departing from the scope of the invention, and all changes, equivalents and modifications that may be made in accordance with the technical solutions of the present invention are intended to be included within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a shallow earthing shield tunnel is worn road reinforcement protection architecture down which characterized in that: the reinforcing protection structure comprises a grouting reinforcing layer arranged right below an existing road (2) above the shield tunnel (1), a plurality of plain concrete underground continuous walls (4) arranged on two sides of the existing road (2) above the shield tunnel (1) and a plurality of expanded anchor rods (6) arranged at the bottom of the shield tunnel (1) right below the existing road (2), wherein the grouting reinforcing layer comprises a WSS grouting reinforcing layer (3) and a sleeve valve pipe grouting reinforcing layer (5) above the grouting reinforcing layer; the WSS grouting reinforcement layer (3) is a grouting reinforcement layer formed by performing WSS drilling and grouting on soil above a tunnel range below a road from above the existing road (2) before the shield tunnel construction is performed, and the sleeve valve pipe grouting reinforcement layer (5) is a grouting reinforcement layer formed by reinforcing the soil within a 120-degree range of the top of the shield tunnel (1) below the existing road (2) by adopting hole inner sleeve valve pipe grouting through grouting holes reserved in the shield tunnel (1) after the shield tunnel construction is completed; the multiple plain concrete underground continuous walls (4) are constructed along the construction line of the shield tunnel (1) before the shield tunnel is constructed, the distance between every two adjacent plain concrete underground continuous walls (4) is 6-10 m, and the distance between the plain concrete underground continuous walls (4) close to the two sides of the existing road (2) and the existing road (2) is 1-3 m; each body-expanding anchor rod (6) is constructed from the bottom of the shield tunnel to the soil body below the shield tunnel after the shield tunnel is constructed, and the length of the anchoring section is 0.8-2 m.
2. The shallow soil covering shield tunnel underpass road reinforcing and protecting structure as claimed in claim 1, characterized in that: the distances among the plurality of plain concrete underground continuous walls (4) arranged on the two sides of the existing road (2) are equal, the thickness of each plain concrete underground continuous wall (4) is 0.4-0.7 m, the depth of each plain concrete underground continuous wall extends to the two sides of the shield tunnel (1), and the depth of each plain concrete underground continuous wall extends to the two sides of the shield tunnel (1) is 1/4-1/3 of the height of the shield tunnel (1).
3. The shallow soil covering shield tunnel underpass road reinforcing and protecting structure as claimed in claim 1 or 2, wherein: the width of the WSS grouting reinforcement layer (3) extends to 3-6 m of the two sides of the tunnel, cement slurry with a water-cement ratio of 1.2:1 is adopted for grouting reinforcement, and the grouting pressure is controlled to be 0.6-1 Mpa.
4. The shallow soil covering shield tunnel underpass road reinforcing and protecting structure as claimed in claim 1 or 2, wherein: the body-expanding anchor rod is a novel pressure-bearing type body-expanding anchor rod, wherein one end of the body-expanding anchor rod is embedded in the soil body below the tunnel (1) within 3-5m after a small-sized anchor rod machine penetrates through a preformed hole of a shield tunnel segment, cement slurry is injected after the completion of embedding, the end of the cement slurry is embedded into the cement slurry reinforced soil body to form a stone body, the injection cement slurry is controlled according to the cement consumption injection amount of 400kg/m, the other end of the body-expanding anchor rod is fixed on the tunnel segment through a high-strength bolt and a steel gasket, the compressive strength of the stone body of each body-expanding anchor rod is about 35Mpa, and the pulling-resistant bearing.
5. The shallow soil covering shield tunnel underpass road reinforcing and protecting structure as claimed in claim 1 or 2, wherein: the sleeve valve pipe is reinforced by groutingSleeve valve pipe grouting pipe of layer (5) adopts
The grouting pressure of the sleeve valve pipe is 0.4-3.5 MPa, and the grouting hole positions are distributed at the positions of 10 points, 11 points, 12 points, 1 point and 2 points above the two sides of the shield segment of the shield tunnel (1).
6. The shallow soil covering shield tunnel underpass road reinforcing and protecting structure as claimed in claim 1 or 2, wherein: when the tunnel embedding depth is more than 4m, the length of the plain concrete underground continuous wall (4) is controlled to be 4m, and the upper part of the continuous wall is a hollow pile backfilled by clay.
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| CN201920604672.1U CN209924998U (en) | 2019-04-29 | 2019-04-29 | Shallow earthing shield tunnel is worn road reinforcement protection architecture down |
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| CN201920604672.1U CN209924998U (en) | 2019-04-29 | 2019-04-29 | Shallow earthing shield tunnel is worn road reinforcement protection architecture down |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305050A (en) * | 2020-03-12 | 2020-06-19 | 中交第三航务工程局有限公司 | Protection process for existing piers on two sides in tunnel construction |
| CN111720125A (en) * | 2020-05-15 | 2020-09-29 | 龙德建设有限公司 | Construction process for tunnel underpass highway |
| CN111734444A (en) * | 2020-07-31 | 2020-10-02 | 中铁二十局集团第五工程有限公司 | Construction method of shield segment grouting reinforcement structure close to existing line |
| CN113187507A (en) * | 2021-05-17 | 2021-07-30 | 中铁十二局集团第四工程有限公司 | Grouting reinforcement method for deformation control of underground excavation tunnel underpass operation subway section |
| CN115163089A (en) * | 2022-05-13 | 2022-10-11 | 中铁建华南建设有限公司 | Multi-source associated informatization risk management and control implementation method for underpass of existing subway line |
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2019
- 2019-04-29 CN CN201920604672.1U patent/CN209924998U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305050A (en) * | 2020-03-12 | 2020-06-19 | 中交第三航务工程局有限公司 | Protection process for existing piers on two sides in tunnel construction |
| CN111305050B (en) * | 2020-03-12 | 2021-10-15 | 中交第三航务工程局有限公司 | Protection process for existing piers on two sides in tunnel construction |
| CN111720125A (en) * | 2020-05-15 | 2020-09-29 | 龙德建设有限公司 | Construction process for tunnel underpass highway |
| CN111734444A (en) * | 2020-07-31 | 2020-10-02 | 中铁二十局集团第五工程有限公司 | Construction method of shield segment grouting reinforcement structure close to existing line |
| CN113187507A (en) * | 2021-05-17 | 2021-07-30 | 中铁十二局集团第四工程有限公司 | Grouting reinforcement method for deformation control of underground excavation tunnel underpass operation subway section |
| CN115163089A (en) * | 2022-05-13 | 2022-10-11 | 中铁建华南建设有限公司 | Multi-source associated informatization risk management and control implementation method for underpass of existing subway line |
| CN115163089B (en) * | 2022-05-13 | 2023-02-14 | 中铁建华南建设有限公司 | Multi-source associated informatization risk management and control implementation method for underpass of existing subway line |
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