CN114320324A - Shield starting receiving reinforcing structure and method based on waterproof curtain - Google Patents
Shield starting receiving reinforcing structure and method based on waterproof curtain Download PDFInfo
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- CN114320324A CN114320324A CN202111663335.8A CN202111663335A CN114320324A CN 114320324 A CN114320324 A CN 114320324A CN 202111663335 A CN202111663335 A CN 202111663335A CN 114320324 A CN114320324 A CN 114320324A
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- shield
- waterproof curtain
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- end well
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Abstract
The invention discloses a shield starting receiving reinforcing structure and method based on a waterproof curtain, and belongs to the field of rail transit construction. The existing shield starting, receiving and reinforcing has leakage risk, and the reinforcing expansion can improve the manufacturing cost. The invention provides a shield starting and receiving reinforcement structure and method based on a waterproof curtain, which comprises a shield end well for shield starting or receiving, wherein one end of the shield end well is connected with a shield tunnel, a cement stirring wall is arranged at the shield tunnel at one side of the shield end well and is used as the waterproof curtain, the cement stirring wall is formed by integrally connecting two peripheral walls surrounding two sides of the shield tunnel and a middle wall corresponding to the excavation working face of the shield tunnel, stirring piles in rows are continuously arranged close to the shield end well at the inner side of the waterproof curtain to form a reinforcement body, a reinforcement structure is arranged at the joint of the waterproof curtain and the shield end well, and a plurality of dewatering wells are arranged at the inner side of the waterproof curtain and avoid the shield tunnel. The invention can improve the water stopping effect and reduce the leakage risk, and has low construction cost and short construction period.
Description
Technical Field
The invention belongs to the field of rail transit construction, and particularly relates to a shield starting receiving reinforcing structure and method based on a waterproof curtain.
Background
With the acceleration of urban construction, the construction speed of urban rail transit engineering is increasing day by day, shield engineering is adopted for construction between stations, the starting and receiving of a shield are two key nodes of the shield engineering, and effective water stopping of a starting well and a receiving well is also a key point and a difficulty point in the whole construction process. The problem of reinforcing the shield starting and receiving is very important because the synchronous grouting and shield propelling in the starting and receiving stages cannot be synchronous, so that the shield often has safety accidents such as water leakage and the like in the starting and receiving stages, and meanwhile, the shield is influenced by underground water.
The traditional shield starting and receiving reinforcement mode is a scheme of reinforcing and adding precipitation in a full hall at present, underground water can be effectively prevented through the water stop effect of reinforcing in the full hall, and the risk of water leakage in the shield starting and receiving stage is reduced. In the actual construction process, a traditional full-scale reinforcing mode of the triaxial mixing pile is used, the reinforcing effect is not satisfactory due to the influence of factors such as the engaging amount of a pile body and the verticality of a formed pile in the construction process, and a leakage channel in the reinforcing body is still easy to appear to cause leakage water received by the starting of the shield; and with the construction mode that the length of the reinforcing body is the length of the shield machine and the width of the ring pipe piece is added, the reinforcing range is greatly enlarged compared with the prior art, the construction cost is further increased, and the construction cost is greatly improved.
Disclosure of Invention
The invention provides a shield starting and receiving reinforcement structure and method based on a waterproof curtain, aiming at solving the technical problems that the existing shield starting and receiving reinforcement adopts a triaxial mixing pile to reinforce the shield starting and receiving reinforcement in a full space, and is influenced by multiple factors such as pile body occlusion amount, pile forming verticality and the like to cause reinforcement effect to be not expected, a leakage channel in the reinforcement body causes shield starting and receiving leakage water, the reinforcement range is enlarged, and the construction cost is increased.
The technical scheme adopted by the invention for solving the technical problem is as follows: a shield starting and receiving reinforcement structure based on a waterproof curtain comprises a shield end well, wherein one end of the shield end well is connected with a shield tunnel, and the shield starting and receiving reinforcement structure is characterized in that a cement stirring wall is arranged at the shield tunnel at one side of the shield end well and is used as the waterproof curtain, the cement stirring wall is formed by integrally connecting two peripheral walls surrounding two sides of the shield tunnel and a middle wall corresponding to the excavation working face of the shield tunnel, the two peripheral walls are respectively positioned at three meters on two sides of the shield tunnel and are parallel to the shield tunnel, one side end part of each peripheral wall is respectively connected with two ends of the middle wall, the other side end part of each peripheral wall is butted with the shield end well, stirring piles in rows are continuously arranged next to the shield end well on the inner side of the waterproof curtain to form a reinforcement body, and the size height of the reinforcement body on the radial plane of the shield tunnel is 3 meters above the outer diameter top of the shield tunnel and 3 meters below the bottom, size width is 3 meters to the another side outside 3 meters in one side outside of shield tunnel external diameter, and the reinforcement body is 4 ~ 6 meters along shield tunnel length direction's size length, the seam crossing of stagnant water curtain and shield structure end well sets up reinforced structure, and the inboard of stagnant water curtain is avoided the shield tunnel and is set up a plurality of precipitation wells.
According to the reinforcing structure, a cement stirring wall is arranged on the periphery of a shield end well for shield starting or receiving to serve as a waterproof curtain to seal and surround a section of a shield tunnel connecting end hook end well, and meanwhile, the underground water level is reduced by combining precipitation wells on the inner side and the outer side of the waterproof curtain, so that underground water on the outer side of the waterproof curtain is prevented from entering a shield starting or receiving range, and the reinforcing effect is ensured; the reinforcing bodies are continuously arranged in rows by using the stirring piles, and play a role of stabilizing the soil body when a portal is chiseled off so as to reinforce and improve the stability of the soil body of the portal, reduce the length of the reinforcing bodies, reduce the engineering investment and shorten the construction period; a continuous reinforcing structure is further arranged at the joint position of the waterproof curtain and the shield end well, namely the shield tunnel portal, and the reinforcing structure is used for preventing leakage between the waterproof curtain and the shield end well, namely the enclosing structure, and ensuring the waterproof effect.
As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: the reinforced structure is continuous in row jet grouting piles, the head and the tail of the row of jet grouting piles are respectively butted with two peripheral walls of the waterproof curtain, and the continuous direction of the jet grouting piles is perpendicular to the extending direction of the shield end well. Stirring stake (reinforcement body) during construction and headwall envelope can't effectively laminate, can leave a gap in the middle, adopts the jet grouting stake to fill this gap, ensures that whole reinforcement body can both consolidate closely knit, plays the stagnant water effect, and the envelope here is the envelope in the end well headwall outside.
The jet grouting pile is a high-pressure jet grouting pile or an MJS jet grouting pile. The two types of rotary jet piles can achieve good joint filling, reinforcing and water stopping effects. The MJS is an English abbreviation (Metro Jet System) of 'omnibearing high-pressure Jet', the pile diameter of the Jet grouting pile is large, the pile body quality is good, and the high-pressure Jet grouting pile and the MJS Jet grouting pile are the prior art in subway construction.
The stirring pile is a triaxial stirring pile. The triaxial mixing pile is used for spraying cement into a soil body and fully mixing the cement, so that the cement and the soil generate a series of physical and chemical reactions, and soft soil is hardened to improve the strength of the foundation.
The reinforcing body that triaxial stirring stake formed is as strong regional A district of consolidating, and the length size of a district along shield tunnel extending direction is 4 ~ 6 meters, and A district top is weak reinforcing regional B district to ground. The reinforcing length of the conventional reinforcing body is about 12m, the reinforcing length of the reinforcing body is greatly shortened compared with that of the conventional construction method, the actual reinforcing length is 4-6 m, and the reinforcing length can be further optimized to 4 m.
And the well depth of the dewatering well is 5 meters below the tunnel bottom of the shield tunnel. The well depth is set to the distance to meet the construction requirement by considering the influences of factors such as well bottom filling, filter tube length, water catchment depth and the like.
The cement mixing wall is a TRD cement mixing wall, and the thickness of the wall body is 800-900 mm. The TRD construction method is an abbreviation of a constant-thickness cement-soil underground continuous Wall construction method (Trench cutting Re-mixing Deep Wall method), and a continuous cement stirring Wall is manufactured according to the construction method, and belongs to the prior art.
A shield starting receiving and reinforcing method based on a waterproof curtain is characterized by comprising the following steps in sequence:
1) applying a cement stirring wall as a waterproof curtain close to a shield end well where the shield starts or receives;
2) applying a reinforcing body close to the shield end well on the inner side of the waterproof curtain;
3) applying a reinforcing structure at the joint of the shield end well and the waterproof curtain;
4) and constructing a plurality of dewatering wells in the shield tunnel at the position of the inner side of the waterproof curtain corresponding to the neutral position between the waterproof curtain and the reinforcing body.
According to the shield launching or receiving device, the waterproof curtain, the reinforcing body, the reinforcing structure and the dewatering well are constructed in sequence, so that underground water outside the waterproof curtain is prevented from entering a shield launching or receiving range; the reinforcing body is used for ensuring the reinforcing effect, plays a role of stabilizing the soil body when a portal is chiseled off, improves the stability of the soil body of the portal, reduces the length of the reinforcing body, reduces the engineering investment and shortens the construction period; the joint position reinforced structure of the inner side of the waterproof curtain and the shield end well prevents leakage between the waterproof curtain and the shield end well, and further ensures the waterproof effect. And after the construction steps are carried out, starting the dewatering well to enable the water level to be lowered to be below the bottom of the shield tunnel, and starting shield starting or receiving operation.
The invention provides a shield starting and receiving reinforcement structure and a method based on a waterproof curtain, wherein a cement stirring wall is arranged at the periphery of a shield end well for shield starting or receiving to serve as the waterproof curtain to seal and surround a section of a shield tunnel connecting end hook end well, and meanwhile, a dewatering well on the inner side and the outer side of the waterproof curtain is combined to reduce the underground water level so as to prevent underground water on the outer side of the waterproof curtain from entering a shield starting or receiving range to ensure reinforcement, and further, a reinforcement body is applied to a continuous row of stirring piles tightly attached to the shield end well in the inner side area of the waterproof curtain to strengthen the stability of a tunnel portal soil body so as to stabilize the soil body when the tunnel portal is chiseled, and a continuous reinforcement structure is applied to the joint position of the waterproof curtain and the shield end well by using jet grouting piles to prevent leakage between the waterproof curtain and the shield end well and ensure a waterproof effect, the reinforcing structure and the reinforcing method can improve the water stopping effect, reduce the construction cost and shorten the construction period.
Drawings
FIG. 1: horizontal sectional view of the invention
FIG. 2: the invention is a vertical cross-sectional view.
In the figure: 1. shield end well, 2, waterproof curtain, 2-1, peripheral wall, 2-2, middle wall, 3, reinforcing body, 4, dewatering well and 5, jet grouting pile.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1-2, a shield starting and receiving reinforced structure based on waterproof curtain, taking an arrow in the figure as the shield receiving direction as an example, comprises a shield end well 1 for shield starting or receiving, one end of the shield end well 1 is connected with a shield tunnel, and the reinforced structure is characterized in that a cement mixing wall is arranged at the shield tunnel at one side of the shield end well 1 as the waterproof curtain 2, the cement mixing wall is formed by integrally connecting two peripheral walls 2-1 surrounding two sides of the shield tunnel and a middle wall 2-2 corresponding to the excavation working face of the shield tunnel, the two peripheral walls 2-1 are respectively positioned at three meters positions at two sides of the shield tunnel and are parallel to the shield tunnel, one side end part of the two peripheral walls 2-1 is respectively connected with two ends of the middle wall 2-2, the other side end part of the two peripheral walls 2-1 is butted with the shield end well 1, the cement mixing wall adopts a TRD cement mixing wall, the thickness of the wall body is between 800 mm and 900mm, and 850mm is preferred in the embodiment; the inner side of the waterproof curtain 2 is adjacent to a shield end well 1, continuous stirring piles in rows are arranged to form a reinforcing body 3, in the embodiment, three-axis stirring piles are adopted to manufacture the reinforcing body 3, the size height of the reinforcing body 3 on the radial plane of a shield tunnel is 3 meters above the top of the outer diameter of the shield tunnel to 3 meters below the bottom of the outer diameter of the shield tunnel, the size width is 3 meters from the outer side of one side of the outer diameter of the shield tunnel to the outer side of the other side of the outer diameter of the shield tunnel, the size length of the reinforcing body 3 along the length direction of the shield tunnel is 4-6 meters, in the embodiment, 4 meters are preferred, the reinforcing body 3 formed by the three-axis stirring piles is used as an area A with strong reinforcement, and an area B with weak reinforcement from the upper part of the area A to the ground; a reinforcing structure is arranged at the joint of the waterproof curtain 2 and the shield end well 1, the reinforcing structure is continuous rows of jet grouting piles 5, in the embodiment, high-pressure jet grouting piles or MJS jet grouting piles can be adopted as the jet grouting piles, preferably MJS jet grouting piles are adopted, the rows of jet grouting piles 5 are respectively butted with two peripheral walls 2-1 of the waterproof curtain 2 from head to tail, and the continuous direction of the jet grouting piles 5 is vertical to the extending direction of the shield end well 1; the inner side of the waterproof curtain 2 avoids the shield tunnel and is provided with a plurality of dewatering wells 4, and the well depth of the dewatering wells 4 is 5 meters below the tunnel bottom of the shield tunnel.
A shield starting receiving and reinforcing method based on a waterproof curtain is sequentially carried out according to the following steps:
1) a cement mixing wall is constructed adjacent to a shield end well 1 for shield starting or receiving to serve as a waterproof curtain 2;
2) a reinforcing body 3 is constructed on the inner side of the waterproof curtain 2 close to the shield end well 1;
3) a reinforcing structure is applied to the joint of the shield end well 1 and the waterproof curtain 2;
4) and constructing a plurality of dewatering wells 4 in the inner side of the waterproof curtain 2 corresponding to the neutral position between the waterproof curtain 2 and the reinforcing body 3 and avoiding the shield tunnel.
According to the invention, a cement mixing wall is arranged at the periphery of a shield end well for shield starting or receiving as a waterproof curtain to seal and surround a section of the shield tunnel connecting end hook end well, and meanwhile, a dewatering well on the inner side and the outer side of the waterproof curtain is combined to reduce the underground water level, so that underground water on the outer side of the waterproof curtain is prevented from entering a shield starting or receiving range, and the reinforcing effect is ensured; the reinforcing bodies are continuously arranged in rows by using the stirring piles, can play a role of stabilizing the soil body when a portal is chiseled, reinforce and improve the stability of the soil body of the portal, reduce the length of the reinforcing bodies, reduce the engineering investment and shorten the construction period; the continuous reinforced structure of the joint position of the waterproof curtain and the shield end well can prevent the waterproof curtain and the shield end well, namely the enclosure structure from leaking, and ensure the waterproof effect.
Claims (8)
1. The utility model provides a shield constructs based on stagnant water curtain is originated and is received reinforced structure, includes shield constructs the shield and starts or the shield that receives end well (1), shield constructs end well (1) one end and links to each other with the shield tunnel, characterized by shield constructs the shield tunnel department of end well (1) one side and sets up cement mixing wall as stagnant water curtain (2), cement mixing wall is by enclosing two peripheral walls (2-1) of shield tunnel both sides and the middle wall (2-2) integrative the connection of corresponding shield tunnel excavation operation face and forms, and two peripheral walls (2-1) are located three meters positions in shield tunnel both sides and parallel shield tunnel respectively, and the both ends of middle wall (2-2) are connected respectively to two peripheral wall (2-1) one side tip, the opposite side tip butt joint shield end well (1) of two peripheral walls (2-1), the inboard of stagnant water curtain (2) is closely adjacent shield end well (1) and is set up continuous stirring stake form in a row Become to add solid (3), add solid (3) and highly be 3 meters to the end below 3 meters above the shield tunnel external diameter top at shield tunnel radial planar size, size width is 3 meters to the another side outside 3 meters in one side outside of shield tunnel external diameter, adds solid (3) and is 4 ~ 6 meters along shield tunnel length direction's size length, the seam crossing of stagnant water curtain (2) and shield end well (1) sets up reinforced structure, and the inboard of stagnant water curtain (2) is avoided the shield tunnel and is set up a plurality of precipitation wells (4).
2. The shield launching and receiving reinforcement structure based on the waterproof curtain as claimed in claim 1, wherein the reinforcement structure is a continuous row of the jet grouting piles (5), the row of the jet grouting piles (5) are respectively butted with two peripheral walls (2-1) of the waterproof curtain (2) end to end, and the continuous direction of the jet grouting piles (5) is perpendicular to the extending direction of the shield end well (1).
3. The shield launching and receiving reinforcement structure based on the waterproof curtain as claimed in claim 2, wherein the jet grouting pile (5) is a high pressure jet grouting pile or an MJS jet grouting pile.
4. The shield starting and receiving reinforcement structure based on the waterproof curtain as claimed in claim 1, wherein the stirring piles are triaxial stirring piles.
5. The shield launching and receiving reinforcement structure based on the waterproof curtain as claimed in claim 4, wherein the reinforcement body (3) formed by the triaxial mixing piles is used as a strong reinforcement area A, the length of the area A along the extending direction of the shield tunnel is 4-6 m, and the area A is a weak reinforcement area B from the upper part to the ground.
6. The shield originating receiving and reinforcing structure based on the waterproof curtain as claimed in claim 1, wherein the well depth of the dewatering well (4) is 5 meters below the tunnel bottom of the shield tunnel.
7. The shield starting and receiving reinforcing structure based on the waterproof curtain as claimed in claim 1, wherein the cement mixing wall is a TRD cement mixing wall, and the thickness of the wall body is between 800 mm and 900 mm.
8. The shield starting and receiving reinforcement method based on the waterproof curtain as claimed in any one of claims 1 to 7, wherein the reinforcement method is carried out according to the following steps in sequence:
1) a cement mixing wall is constructed close to a shield end well (1) for shield starting or receiving to serve as a waterproof curtain (2);
2) a reinforcing body (3) is arranged on the inner side of the waterproof curtain (2) and is close to the shield end well (1);
3) a reinforcing structure is arranged at the joint of the shield end well (1) and the waterproof curtain (2);
4) and constructing a plurality of dewatering wells (4) in a position, corresponding to a neutral position between the waterproof curtain (2) and the reinforcing body (3), on the inner side of the waterproof curtain (2) and avoiding the shield tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111663335.8A CN114320324A (en) | 2021-12-31 | 2021-12-31 | Shield starting receiving reinforcing structure and method based on waterproof curtain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111663335.8A CN114320324A (en) | 2021-12-31 | 2021-12-31 | Shield starting receiving reinforcing structure and method based on waterproof curtain |
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| Publication Number | Publication Date |
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| CN114320324A true CN114320324A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111663335.8A Pending CN114320324A (en) | 2021-12-31 | 2021-12-31 | Shield starting receiving reinforcing structure and method based on waterproof curtain |
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| CN (1) | CN114320324A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288113A (en) * | 2022-07-20 | 2022-11-04 | 中国一冶集团有限公司 | Reinforced structure for jacking and withdrawing of jacking pipe and construction method thereof |
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| CN111411970A (en) * | 2020-03-25 | 2020-07-14 | 中铁三局集团有限公司 | Shield starting construction method under water-rich sand layer geological condition |
| CN211370397U (en) * | 2019-07-15 | 2020-08-28 | 中铁第四勘察设计院集团有限公司 | Enclosure structure capable of reducing shield originating or receiving risk |
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2021
- 2021-12-31 CN CN202111663335.8A patent/CN114320324A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303155A (en) * | 2006-05-11 | 2007-11-22 | Shimizu Corp | Construction method of underground cavity and tunnel construction method |
| CN205154194U (en) * | 2015-12-07 | 2016-04-13 | 中铁十一局集团城市轨道工程有限公司 | Stagnant water of shield tunnel portal department ends husky structure |
| CN106194218A (en) * | 2016-08-30 | 2016-12-07 | 中铁第四勘察设计院集团有限公司 | The shield end soil body reinforcement system in high water head deep and thick sand area |
| CN106988753A (en) * | 2017-05-08 | 2017-07-28 | 中建三局基础设施工程有限公司 | A kind of U-shaped plain concrete ground-connecting-wall adds steel bushing shield structure and its method of reseptance |
| CN211370397U (en) * | 2019-07-15 | 2020-08-28 | 中铁第四勘察设计院集团有限公司 | Enclosure structure capable of reducing shield originating or receiving risk |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115288113A (en) * | 2022-07-20 | 2022-11-04 | 中国一冶集团有限公司 | Reinforced structure for jacking and withdrawing of jacking pipe and construction method thereof |
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