CN211692490U - Shield constructs reinforcing structure who wears river course under shallow earthing - Google Patents
Shield constructs reinforcing structure who wears river course under shallow earthing Download PDFInfo
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- CN211692490U CN211692490U CN202020059069.2U CN202020059069U CN211692490U CN 211692490 U CN211692490 U CN 211692490U CN 202020059069 U CN202020059069 U CN 202020059069U CN 211692490 U CN211692490 U CN 211692490U
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Abstract
The utility model provides a pair of shield constructs reinforcing structure who wears river course under shallow earthing. The reinforcing structure comprises a WSS pre-grouting reinforcing body, a TSS tracking grouting reinforcing body and a small guide pipe grouting reinforcing body; the WSS pre-grouting reinforcement body and the TSS tracking grouting reinforcement body are both constructed through an overwater construction platform erected on the water surface of a shield tunnel passing through a river channel area, and the WSS pre-grouting reinforcement body is formed by performing WSS grouting on a riverbed above a shield tunnel before the shield tunnel passes through; the TSS tracking grouting reinforcement body is formed by performing TSS tracking grouting on a WSS pre-grouting reinforcement body in the shield downward penetration process; the small guide pipe grouting reinforcement body is formed by grouting the back of the shield tunnel segment through the small guide pipe embedded in the reserved hole in the upper area of the shield tunnel segment after the shield passes through the river channel. The utility model discloses solve the problem of shallowly burying the shield tunnel and wear the river course down effectively, avoided the shield tunnel later stage operation in-process to take place risks such as tunnel come-up, percolating water.
Description
Technical Field
The utility model discloses to urban rail construction field, specifically be a reinforcing structure who wears the river course under shield constructs shallow earthing.
Background
With the continuous development of national economy and urban traffic construction in China, the climax of underground rail traffic construction is raised in China, the environment for subway construction is increasingly complex, and the situation of crossing rivers and lakes in construction is more and more. When the shield tunnel passes through a river, the buried depth of the tunnel is shallow, the posture is extremely difficult to control when the shield tunnel is tunneled, and the tunnel is extremely easy to float upwards. And the bottom of the riverbed is soft in geology, and risks such as roof fall, water burst, collapse and the like easily occur due to improper treatment.
Until now, two main methods are adopted for construction of a shield crossing a shallow soil covered river channel, one method is to control the shield to float upwards by auxiliary measures such as foundation reinforcement, anti-floating pressure plate arrangement, earth surface pressure weight and the like, but the method has poor operability, complicated measures and high construction cost; and the other method is that a cut-off dam is constructed in a water area to cut off the river and ensure that the shield passes through. Therefore, it is particularly important to research a reinforcing structure of a river channel for ensuring the shield to penetrate under shallow soil.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to prior art provides a reinforcing structure who wears the river course under the shallow earthing of shield structure, should consolidate the framework and can solve the shallow problem of wearing the river course under the shield tunnel of burying effectively, avoid shield tunnel later stage operation in-process to take place risks such as tunnel come-up, percolating water.
In order to ensure that a shallow shield tunnel passes through a river channel safely, the utility model provides a reinforcing structure for a shield tunnel to penetrate through the river channel under shallow soil covering, which comprises a WSS pre-grouting reinforcing body, a TSS tracking grouting reinforcing body and a small duct grouting reinforcing body, wherein the WSS pre-grouting reinforcing body, the TSS tracking grouting reinforcing body and the small duct grouting reinforcing body are arranged between the shield tunnel which penetrates through the river channel area and the river channel under the shield tunnel; the WSS pre-grouting reinforcement body is formed by performing WSS grouting on a riverbed above a shield tunnel through an overwater construction platform erected on the water surface of a river channel area before the shield passes through, and the reinforcement range is from the river bottom to 1-2m below the top mark of the shield tunnel; the TSS tracking grouting reinforcement body is formed by performing TSS tracking grouting on a WSS pre-grouting reinforcement body along with the position of a shield machine through an overwater construction platform erected on the water surface of a river channel area in the process of downward penetration of a shield; the small guide pipe grouting reinforcement body is formed by grouting the back of the shield tunnel segment through the small guide pipe embedded in the reserved hole in the upper part area of the shield tunnel segment in the forming tunnel after the shield passes through the river channel.
The utility model discloses further technical scheme: the overwater construction platform consists of a plurality of hollow buoys arranged side by side and bamboo plywood paved on the surfaces of the hollow buoys, the hollow buoys are connected into a whole through steel pipes and lock fasteners, and gaps larger than the diameter of a grouting drill rod are arranged between the adjacent hollow buoys; the construction platform on water sets up the scope and than the construction area width 2 ~ 3m, and the construction platform on water passes the bank in river course region through the anchor rod and hawser is fixed at the shield and passes, sets up the guardrail in the both sides of construction platform on water.
The utility model discloses better technical scheme: the distribution spacing of the grouting points of the WSS pre-grouting reinforcement body is 0.8-1.2 m, and the grouting pressure is controlled to be below 1 Mpa.
The utility model discloses better technical scheme: the TSS tracking grouting reinforcement body is formed by grouting a TSS primary grouting pipe which is embedded from a pilot hole on an overwater construction platform by adopting a geological drilling machine, the TSS primary grouting pipe is arranged in a quincunx shape, and the embedding interval is 1.5-1.8 m; the diameter of the TSS primary grouting pipe is 42mm, the pipe wall thickness is 3.5mm, the grouting pressure is controlled to be below 2.0Mpa, the grouting segment length is 0.5-0.8m, and the single-hole unit grouting amount is controlled to be 300-400L/m.
The utility model discloses better technical scheme: the grouting reinforcement range of the small guide pipe grouting reinforcement body is more than 3 and 9 point positions of the tunnel, 8 threaded grouting holes are reserved at the positions of each ring of shield tunnel segment more than 3 and 9 point positions, the diameter of each grouting hole is 40-70 mm, the included angle of each outer edge grouting hole is 72 degrees, and a matched grouting hole cover is prepared; and (3) drilling a hole in each reserved grouting hole by adopting a rhinestone, burying a small guide pipe, and performing small grouting for multiple times in a circulating manner to form a small guide pipe grouting reinforcement body.
The utility model discloses better technical scheme: and the grouting points of the WSS pre-grouting reinforcement body and the grouting points of the TSS tracking grouting reinforcement body are distributed in a crossed manner.
The utility model discloses better technical scheme: the diameter of the hollow buoy is 50-60 cm.
The utility model discloses the construction platform on water that sets up on the river before the shield constructs through, its construction platform on water provides the platform place for the construction, simultaneously in the shield tunnelling process, can in time, accurately monitor the river condition, prevent to appear great incident and guarantee the safety in the work progress; the WSS pre-grouting reinforcement body is applied before the shield passes through the shield, and grouting reinforcement forms a compact reinforcement body above the shield, so that the risks of roof collapse, collapse and the like caused by overlarge settlement of the shield in the passing process or soil body softness are prevented; the TSS constructed in the shield tunneling process tracks the grouting reinforcement body, so that the risks of water burst in the shield tunneling machine, river bed roof collapse and the like caused by the fact that a contact channel is formed between a shield tunneling machine soil bin and a river channel in soil bodies which are not in place for WSS grouting reinforcement are effectively avoided; after the shield passes through, a small pipe is embedded in an embedded grouting hole reserved during the manufacture of the pipe piece, grouting is carried out from the inside of the tunnel hole through the small pipe, a small guide pipe grouting reinforcing body is formed outside the positions above the 3 and 9 point positions of the tunnel hole body, a compact protective body is formed above the tunnel, the tunnel is protected, and the phenomenon that the tunnel floats upwards or leaks water in operation is prevented.
The utility model discloses simple structure, construction convenience can be followed different angles and consolidated to the region between shield tunnel and the river course, have solved the shallow problem of wearing the river course under the shield tunnel of burying effectively, have avoided the shield tunnel later stage operation in-process to take place risks such as tunnel come-up, percolating water.
Drawings
FIG. 1 is a plan view of a reinforcing structure for a shield shallow casing underrun channel;
fig. 2 is a sectional view a-a of the reinforcing structure of the shield shallow earth underrun channel.
In the figure: the method comprises the following steps of 1, enabling a shield to penetrate through a river channel area, 2, enabling the shield to penetrate through a tunnel, 3, enabling a WSS pre-grouting reinforcement body, 4, a TSS tracking grouting reinforcement body, 5, a small guide pipe grouting reinforcement body, 5-1, a grouting hole, 6, an overwater construction platform, 7-a TSS primary grouting pipe, 8, an overwater construction platform fixing cable and 9, wherein the WSS pre-grouting reinforcement body is a TSS tracking grouting reinforcement body.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 2 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. 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", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do 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 reinforcing structure of the shield shallow-soil-covered underpass river channel provided by the embodiment comprises a WSS pre-grouting reinforcing body 3, a TSS tracking grouting reinforcing body 4 and a small-conduit grouting reinforcing body 5 which are arranged between a shield tunnel 2 of a shield underpass river channel and a shield tunnel area 1 of the shield underpass river channel, as shown in fig. 1 and fig. 2. The overwater construction platform 6 is composed of a plurality of hollow buoys arranged side by side and bamboo plywood paved on the surfaces of the hollow buoys, the diameters of the hollow buoys are 50-60 cm, the hollow buoys are connected into a whole through steel pipes and buckle fasteners, gaps larger than the diameter of a grouting drill rod are formed between the adjacent hollow buoys, and the hollow buoys cannot be damaged through drill guide holes before grouting; the construction platform 6 on water sets up the wide 2 ~ 3m in scope than the construction area, and construction platform 6 on water passes the bank side that the river course region 1 was passed to the shield through stock and hawser through to fix, sets up the guardrail in construction platform 6's on water both sides. The WSS pre-grouting reinforcement body 3 is formed by performing WSS grouting on a riverbed above the shield tunnel 2 through an overwater construction platform 6 erected on the water surface of the shield tunnel passing through the river channel region 1 before the shield tunnel passes through, and the reinforcement range is from the river bottom to 1-2m below the top mark of the shield tunnel 2; the distribution spacing of grouting points of the WSS pre-grouting reinforcement body 3 is 0.8-1.2 m, and the grouting pressure is controlled below 1 Mpa.
The TSS tracking grouting reinforcement body 4 in the embodiment is a reinforcement body formed by conducting TSS tracking grouting on a WSS pre-grouting reinforcement body 3 through an overwater construction platform 6 and an overwater construction platform 6 which is erected on the water surface of a river channel region 1 and the position of a shield machine in the process of downward penetration of a shield by adopting a geological drilling machine to lead a TSS primary grouting pipe 7 which is buried in a hole from the overwater construction platform 6 after the grouting of the WSS pre-grouting reinforcement body 3 is completed; wherein the TSS primary grouting pipes 7 are arranged in a quincunx shape, and the embedding interval is 1.5-1.8 m; the diameter of the TSS primary grouting pipe 7 is 42mm, the pipe wall thickness is 3.5mm, the grouting pressure is controlled below 2.0Mpa, the grouting segment length is 0.5-0.8m, and the single-hole unit grouting amount is controlled at 300-400L/m. The grouting points of the WSS pre-grouting reinforcement body 3 and the TSS tracking grouting reinforcement body 4 are distributed in a cross mode.
In the embodiment, the small guide pipe grouting reinforcement body 5 is formed by grouting the back of the shield tunnel segment through the small guide pipe embedded in the reserved hole in the upper area of the shield tunnel segment in the forming tunnel after the shield passes through the river channel. The grouting reinforcement range of the small guide pipe grouting reinforcement body 5 is more than 3 and 9 point positions of the tunnel, 8 thread grouting holes are reserved at positions above 3 and 9 point positions of each ring of shield tunnel segments in the segment manufacturing process, reinforcing bars are reinforced to meet the stress requirement of the tunnel structure, and the 8 thread grouting holes are distributed on the A1, A2, A3 and B, C segments. The diameter of the reserved grouting hole 5-1 is 40-70 mm, the included angle of the outer edge grouting hole is 72 degrees, and a matched grouting hole cover is prepared; and (3) drilling a hole in each reserved grouting hole by adopting a rhinestone, burying a small guide pipe, and performing small grouting for multiple times in a circulating manner to form a small guide pipe grouting reinforcement body 5.
It is right to combine the application embodiment below the utility model discloses it is further explained, the embodiment specifically to certain shield construction project, the shield tunnel of this project need pass through the river course, and the shallow shield tunnel that buries passes through the river course and very easily takes place to roof fall, the scheduling problem that sinks, takes place come-up and percolating water easily in the later stage operation in-process moreover, consequently, for reducing the construction risk, guarantee tunnel later stage operation safety, need handle the river course region that the shallow shield that buries passes through. The inventor of this project has adopted the utility model provides a reinforced structure passes through the river course region to the shield tunnel and consolidates, and concrete construction steps are as follows:
(1) determining the range of the shield passing through a river channel, erecting an overwater construction platform 1 formed by assembling hollow buoys, steel pipes, buckle fasteners and bamboo veneers above the area, and providing an operation surface for overwater construction, wherein the overwater construction platform is characterized in that the hollow buoys with the diameters of 50cm or 60cm are arranged in water, then the buoys are connected into a whole by the steel pipes and the buckle fasteners, then the bamboo veneers are laid on the hollow buoys to serve as the operation surface, finally, anchor rods and cables are used for fixing the hollow buoys above the river channel of a lower penetrating area of the shield tunnel, the width of the platform is 2-3m wider than that of a construction area, and guardrails are arranged on two sides of the platform, so that the safety of personnel;
(2) before the shield passes through, soil bodies from the river bottom of a river channel passing area to 1-2m below the elevation of the top of the tunnel are reinforced through the construction platform in the step (1) by adopting a WSS grouting process, grouting points are selected between adjacent hollow buoys, damage to the buoys in the drilling process is avoided, single-liquid slurry is adopted for grouting, the water-cement ratio is 1.5:1, the grouting pressure is controlled to be below 1Mpa, and grouting reinforcement is carried out to form a compact reinforcing body above the shield, so that the shield is prevented from falling off due to overlarge sedimentation or loose and soft soil bodies in the passing process.
(3) After the WSS grouting is finished, a geological drilling machine is adopted to lead holes to embed TSS primary grouting pipes 7, the diameter of each grouting pipe is 42mm, the wall thickness of each grouting pipe is 3.5mm, and the grouting pipes are arranged in a quincunx shape in a river channel passing region below a tunnel; in the shield tunneling process, according to the monitoring condition and the shield tunneling parameter change, adopting TSS grouting reinforcement in time along with the shield tunneling machine position; the TSS grouting adopts double-fluid slurry, the water-cement ratio of the slurry is 1:1, the grouting pressure is controlled below 2.0Mpa, the grouting segment length is 0.5-0.8m, and the single-hole unit grouting amount is controlled at 400L/m.
(4) Splicing the shield tunnel in the region by using duct pieces with pre-embedded grouting holes, embedding threaded grouting holes according to a required reinforcement range in the shield duct piece manufacturing process, and reinforcing bars to meet the stress requirement of a tunnel structure; each ring pipe sheet is provided with 8 threaded grouting holes, the diameter of each grouting hole is 40-70 mm, the included angle of each outer edge grouting hole is 72 degrees, a matched grouting hole cover is prepared, after the shield tunneling passes, small guide pipes are adopted for grouting and reinforcing in the formed tunnel, a compact reinforcing body is formed on the outer side of the tunnel, and floating and water leakage in the later tunnel operation period are prevented.
After the reinforcing treatment, the problem that the shallow shield tunnel of the project penetrates through the river channel is effectively solved, and risks such as tunnel floating and water leakage do not occur in the later operation process of the shield tunnel.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. The utility model provides a shield constructs reinforcing structure who wears river course under shallow earthing, its characterized in that: the reinforcing structure comprises a WSS pre-grouting reinforcing body (3), a TSS tracking grouting reinforcing body (4) and a small guide pipe grouting reinforcing body (5) which are arranged between a shield tunnel (2) of a river channel passing region (1) and a river channel passing downwards; the WSS pre-grouting reinforcement body (3) is formed by WSS grouting on a riverbed above the shield tunnel (2) through an overwater construction platform (6) erected on the water surface of a river channel area (1) penetrated by the shield before the shield penetrates, and the reinforcement range is from the river bottom to 1-2m below the top mark of the shield tunnel (2); the TSS tracking grouting reinforcement body (4) is formed by performing TSS tracking grouting on a WSS pre-grouting reinforcement body (3) along with the position of a shield machine through an overwater construction platform (6) erected on the water surface of a river channel region (1) penetrated by the shield machine in the downward penetration process of the shield; the small guide pipe grouting reinforcement body (5) is formed by grouting the back of the shield tunnel segment through the small guide pipe embedded in the reserved hole in the upper part area of the shield tunnel segment in the forming tunnel after the shield passes through the river channel.
2. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 1, characterized in that: the overwater construction platform (6) consists of a plurality of hollow buoys arranged side by side and bamboo plywood paved on the surfaces of the hollow buoys, the hollow buoys are connected into a whole through steel pipes and lock fasteners, and gaps larger than the diameter of a grouting drill rod are arranged between the adjacent hollow buoys; the construction platform (6) on water sets up the wide 2 ~ 3m of scope than construction area, and construction platform (6) on water is fixed at the shield through stock and hawser and is passed the bank side of river course region (1), sets up the guardrail in the both sides of construction platform (6) on water.
3. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 1 or 2, wherein: the distribution spacing of the grouting points of the WSS pre-grouting reinforcement body (3) is 0.8-1.2 m, and the grouting pressure is controlled below 1 Mpa.
4. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 1 or 2, wherein: the TSS tracking grouting reinforcement body (4) is formed by grouting through a TSS primary grouting pipe (7) which is embedded from a pilot hole on an overwater construction platform (6) by adopting a geological drilling machine, wherein the TSS primary grouting pipe (7) is arranged in a quincunx shape, and the embedding interval is 1.5-1.8 m; the diameter of the TSS primary grouting pipe (7) is 42mm, the pipe wall thickness is 3.5mm, the grouting pressure is controlled to be below 2.0Mpa, the grouting segment length is 0.5-0.8m, and the single-hole unit grouting amount is controlled to be 300-400L/m.
5. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 1 or 2, wherein: the grouting reinforcement range of the small guide pipe grouting reinforcement body (5) is more than 3 and 9 point positions of the tunnel, 8 thread reserved grouting holes (5-1) are reserved at the positions of each ring of shield tunnel segment more than 3 and 9 point positions, the diameter of each reserved grouting hole (5-1) is 40-70 mm, the included angle of each outer edge grouting hole is 72 degrees, and a matched grouting hole cover is prepared; and (3) drilling a hole in each reserved grouting hole by adopting a rhinestone, burying a small guide pipe, and performing small grouting for multiple times in a circulating manner to form a small guide pipe grouting reinforcement body (5).
6. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 1 or 2, wherein: the grouting points of the WSS pre-grouting reinforcement body (3) and the grouting points of the TSS tracking grouting reinforcement body (4) are distributed in a cross mode.
7. The reinforcing structure of the shield shallow soil-covered river channel penetrating downwards according to claim 2, characterized in that: the diameter of the hollow buoy is 50-60 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020059069.2U CN211692490U (en) | 2020-01-13 | 2020-01-13 | Shield constructs reinforcing structure who wears river course under shallow earthing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020059069.2U CN211692490U (en) | 2020-01-13 | 2020-01-13 | Shield constructs reinforcing structure who wears river course under shallow earthing |
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| CN211692490U true CN211692490U (en) | 2020-10-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343003A (en) * | 2020-10-20 | 2021-02-09 | 中亿丰建设集团股份有限公司 | Reinforcing and seepage-proofing treatment method for ultra-shallow soil covering of river bed in tunnel underpass river construction |
| CN112664203A (en) * | 2020-12-25 | 2021-04-16 | 北京市政路桥股份有限公司 | Reinforcing system for controlling deformation of shield tunnel by dredging river above shield tunnel and construction method |
| CN113863941A (en) * | 2021-09-23 | 2021-12-31 | 浙江省交通运输科学研究院 | Grouting construction method for reducing upward floating of shield tunnel segment in construction period |
| CN114607391A (en) * | 2022-04-08 | 2022-06-10 | 中南大学 | Pre-reinforcing construction method for unconsolidated strata of subway tunnel |
-
2020
- 2020-01-13 CN CN202020059069.2U patent/CN211692490U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343003A (en) * | 2020-10-20 | 2021-02-09 | 中亿丰建设集团股份有限公司 | Reinforcing and seepage-proofing treatment method for ultra-shallow soil covering of river bed in tunnel underpass river construction |
| CN112664203A (en) * | 2020-12-25 | 2021-04-16 | 北京市政路桥股份有限公司 | Reinforcing system for controlling deformation of shield tunnel by dredging river above shield tunnel and construction method |
| CN112664203B (en) * | 2020-12-25 | 2023-06-27 | 北京市政路桥股份有限公司 | Reinforcing system for controlling shield tunnel deformation by river dredging above shield tunnel and construction method |
| CN113863941A (en) * | 2021-09-23 | 2021-12-31 | 浙江省交通运输科学研究院 | Grouting construction method for reducing upward floating of shield tunnel segment in construction period |
| CN113863941B (en) * | 2021-09-23 | 2024-01-12 | 浙江省交通运输科学研究院 | Grouting construction method for reducing floating of shield tunnel segment in construction period |
| CN114607391A (en) * | 2022-04-08 | 2022-06-10 | 中南大学 | Pre-reinforcing construction method for unconsolidated strata of subway tunnel |
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