CN111576483A - Open-cut construction method for sensitive building section near intercity railway tunnel - Google Patents
Open-cut construction method for sensitive building section near intercity railway tunnel Download PDFInfo
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- CN111576483A CN111576483A CN202010435706.6A CN202010435706A CN111576483A CN 111576483 A CN111576483 A CN 111576483A CN 202010435706 A CN202010435706 A CN 202010435706A CN 111576483 A CN111576483 A CN 111576483A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of tunnel construction, in particular to an open-cut construction method for an intercity railway tunnel adjacent sensitive building section. The method comprises the following steps: pile positions are arranged; s2, constructing a cement mixing pile; s3, constructing an isolation pile; s4, constructing the underground continuous wall; s5, constructing the lattice column; s6, excavating a foundation pit; s7, testing the groove on the substrate; s8, constructing a bottom plate: pouring a cushion layer, constructing a waterproof layer of the bottom plate, binding the reinforcing steel bars of the bottom plate and pouring bottom plate concrete; s9, reversing support and side wall construction; s10, constructing a top plate; s11, sealing the structural waterproof layer: laying a roof waterproof layer and pouring a waterproof protective layer; and S12, backfilling the foundation pit. The construction method has the advantages of simple operation and low construction difficulty, effectively enhances the stability of the adjacent building, and reduces the construction risk. The method is mainly applied to open excavation construction of the tunnel adjacent sensitive building section.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to an open-cut construction method for an intercity railway tunnel adjacent sensitive building section.
Background
During open excavation construction of an intercity railway tunnel adjacent sensitive building segment, peripheral stratum changes cannot be avoided in the open excavation tunnel construction, uneven settlement and inclination of an adjacent foundation pit building are caused, and the use function and safety of the building are influenced. In addition, the stratum has thick water-rich sand layers and other complex geological conditions, and severe hole collapse hidden danger exists in the underground diaphragm wall grooving operation of the open cut tunnel enclosure structure, so that the hollow pipe pile close to the foundation pit can be laterally deformed. Except that the excavation of the foundation pit can influence the building and the foundation thereof, the high and large buildings adjacent to the foundation pit can generate larger unbalanced stress to the surrounding stratum and the foundation pit, so that the uneven settlement and the inclination of the buildings around the foundation pit are caused, and the use function and the safety of the buildings are even influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the open excavation construction method for the adjacent sensitive building section of the intercity railway tunnel, which effectively enhances the stability of the sensitive building, reduces the construction risk, and has the advantages of simple process, convenient operation and low construction difficulty.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an open excavation construction method for an intercity railway tunnel adjacent sensitive building section comprises the following steps:
s1, measuring pile position control points by using a total station, and laying pile positions;
s2, constructing a cement mixing pile;
s3, constructing an isolation pile;
s4, constructing the underground continuous wall;
s5, constructing the lattice column;
s6, excavating a foundation pit;
s7, testing the groove on the substrate;
s8, constructing a bottom plate: pouring a cushion layer, constructing a waterproof layer of the bottom plate, binding the reinforcing steel bars of the bottom plate and pouring bottom plate concrete;
s9, reversing support and side wall construction;
s10, constructing a top plate;
s11, sealing the structural waterproof layer: laying a roof waterproof layer and pouring a waterproof protective layer;
and S12, backfilling the foundation pit.
And in the step S2, connecting a slurry storage tank slurry pump with a stirrer by using a slurry conveying rubber pipe, enabling the stirrer to stir along a guide frame, cutting soil and sink, after the soil is sunk to the designed depth, opening a slurry spraying port of the mortar pump, uniformly lifting the slurry spraying port, lifting while stirring the cement slurry and the soil body by a stirring blade until the cement slurry and the soil body are lifted to the designed pile top, and finishing a stirring process.
In the step S3, the isolation pile is drilled into a hole by rotary drilling, and a construction method of "jump-and-play three" is adopted.
In the step S4, the underground continuous wall adopts punching-grabbing combination, the mud protects the wall, the strong-effect wall-protection polymer mud is adopted, and the lifting height of the punching hammer is less than 1.5m each time.
In the step S5, sundries in the lattice column are cleaned before the lattice column is hoisted, the lattice column is arranged at the center of the steel reinforcement cage and is inserted into the foundation of the steel reinforcement cage by at least 2 m.
In the step S6, five points of "layering, substep, symmetry, balance, time limit" are mastered in the excavation process of the foundation pit, the construction principle of "vertical layering, longitudinal partition segmentation, supporting first and then excavation" is followed, the excavation is carried out to the designed supporting bottom and then the support is applied in time, and the earthwork below the designed supporting strength can be excavated when the supporting strength reaches the designed requirement.
In the step S8, the construction section is divided into 10m sections, the construction of the bottom plate is closely followed by the excavation surface, and the distance between the bottom plate and the last layer of earthwork slope toe is less than 2 m.
In step S9, after the strength of the bottom plate concrete meets the requirement, the third support is removed, the side wall is constructed, the back support is timely applied after the side wall is completed, the second support is removed after the strength of the side wall concrete meets the requirement, the support removal number should be determined according to the construction length of the side wall or the top plate without removing the support and reversing the support in advance.
In the step S10, after the structure side wall is completed, the top plate construction is performed, before the top plate is sealed, the center pillar is not cut in advance, and the center pillar is removed in the hole after the structure is integrally formed.
In the step S12, accumulated water and sundries are completely discharged before the foundation pit is backfilled, the foundation pit is backfilled horizontally and symmetrically, and the backfilled soil needs to be tamped in layers or compacted by rolling.
Compared with the prior art, the invention has the beneficial effects that:
the soil body between the sensitive building and the foundation pit enclosure structure is reinforced, the self-stability capability of the soil body can be improved, the side pressure is reduced, and the underground water is effectively blocked. Before the continuous wall grooving construction, the groove wall is pre-reinforced, so that the hole collapse risk in the grooving stage can be effectively reduced, and the construction safety and the continuous wall construction quality are ensured. The method can effectively enhance the stability of the proximity sensitive building, reduce the construction risk, is suitable for open cut foundation pit construction under different geological conditions, and has the advantages of simple process, convenient operation and low construction difficulty.
Drawings
FIG. 1 is a flow chart of a construction method according to the present invention;
fig. 2 is a plan view of the spaced construction of the inventive piles.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An open excavation construction method for an intercity railway tunnel adjacent sensitive building section comprises the following steps:
s1, measuring pile position control points by using a total station, and laying pile positions; s2, constructing a cement mixing pile; s3, constructing an isolation pile; s4, constructing the underground continuous wall; s5, constructing the lattice column; s6, excavating a foundation pit; s7, testing the groove on the substrate; s8, constructing a bottom plate: pouring a cushion layer, constructing a waterproof layer of the bottom plate, binding the reinforcing steel bars of the bottom plate and pouring bottom plate concrete; s9, reversing support and side wall construction; s10, constructing a top plate; s11, sealing the structural waterproof layer: laying a roof waterproof layer and pouring a waterproof protective layer; and S12, backfilling the foundation pit. Before the open excavation construction of the sensitive building section close to the intercity railway tunnel, firstly constructing an isolation pile and a grid type cement mixing pile between an open excavation foundation pit and the building so as to isolate and protect the sensitive building and reinforce the peripheral soil body; the groove wall of the continuous wall close to the sensitive building section is pre-reinforced by adopting double rows of occluded cement mixing piles, so that the risk of groove wall collapse can be reduced, and the construction safety and the quality of the continuous wall are ensured; the measure such as segment layering excavation, strong support, the measurement of working, major structure follow closely the excavation face can realize quick excavation, and the quick closed major structure shortens the foundation ditch and exposes, ensures deep basal pit and adjacent building safety.
Preferably, in step S2, in order to ensure the quality of the bottom, top and shaft of the cement mixing pile, each pile stays at the bottom of the pile for not less than 30S before lifting the drill. The whole pile making process is to ensure that the spraying amount is recorded every time the spraying amount is increased by 1m while stirring, and the actual spraying amount is not less than the range control of 1.1-1.2 times of the designed ash mixing amount. The lifting is carried out continuously, slurry is not allowed to be broken in the lifting stage of the drill rod, otherwise, the supplementary spraying is carried out, and the overlapping length of the supplementary spraying is more than 1 m. And when the guniting amount is insufficient, performing additional spraying, wherein the overlapping length of the additional spraying is more than 50 cm. And after drilling each pile, continuously operating without interrupting the slurry spraying. And (3) connecting a slurry storage tank slurry pump with a stirrer by using a slurry conveying rubber pipe, enabling the stirrer to stir, cut and sink soil along a guide frame, controlling the sinking speed to be 0.9-1.1 m/min, opening a slurry spraying port of an mortar pump after sinking to the designed depth, uniformly lifting the slurry spraying at the speed of 0.9-1.1 m/min, stirring the cement slurry and the soil body by using stirring blades while lifting, and lifting to the designed pile top to finish a stirring process.
Preferably, in step S3, the isolation pile is drilled with a rotary drill to form a hole, and a construction method of "jump-and-play" is adopted to avoid hole crossing and hole collapse, the hole forming operation of the isolation pile has a hole collapse hidden trouble area, or a position near the foundation of the building where deformation occurs, the quality of the retaining wall slurry and the key thereof, and the strong effect retaining wall type polymer slurry can be adopted.
Preferably, in step S4, the underground diaphragm wall is combined by punching and grabbing, the slurry is used for wall protection, the high-efficiency wall protection type polymer slurry is used, the lifting height of the punching hammer is less than 1.5m each time, and key processes such as wall brushing and hole cleaning must be operated in place during grooving construction, so that slag and mud inclusion at weak parts such as diaphragm wall joints are avoided.
Preferably, in step S5, impurities in the lattice column are cleaned before the lattice column is hoisted, the lattice column is arranged at the center of the reinforcement cage and inserted into the foundation of the reinforcement cage by at least 2m, and 4 phi 14 steel bars are fixedly adopted for the lattice column to connect angle steel of the lattice column and the reinforcement cage. After the lattice column concrete is poured, pile holes need to be backfilled in time, and coarse sand can be backfilled uniformly, balancedly and compactly to avoid bias deformation of the lattice column.
Preferably, in step S6, five main points of "layering, step-by-step, symmetry, balance, time-limiting" are mastered in the excavation process of the foundation pit, the support is timely applied after the excavation is performed to the designed support bottom according to the construction principle of "vertical layering, longitudinal partition segmentation, support-first and excavation-later", and the earthwork below the design can be excavated when the support strength meets the design requirement. In the process of excavating the foundation pit, when the horizontal deformation of the foundation pit exceeds an early warning value, the excavation should be stopped firstly, the support should be strengthened in time, the local water leakage of the enclosure structure during the excavation needs to be paid high attention, the grouting and the plugging are needed in time, when the local water leakage is serious, the excavation should be suspended, the reason is analyzed, and the excavation can be carried out after the grouting and the plugging.
Preferably, in step S7, when the mechanical excavation reaches the design elevation +0.3m, manual excavation is used instead, after manual bottom cleaning is completed, the foundation is inspected and accepted by related personnel of the units such as construction, supervision, design and owner, and the next procedure can be performed after the acceptance is passed.
Preferably, in step S8, the construction section is divided into 10m sections, the bottom plate construction is followed by the excavation face, and the distance between the bottom plate and the last layer of earthwork toe is less than 2 m.
Preferably, in step S9, after the strength of the bottom plate concrete meets the requirement, the third support is removed, the side wall is constructed, the back support is timely applied after the side wall is completed, after the strength of the side wall concrete meets the requirement, the second support is removed, the support removal number should be determined according to the construction length of the side wall or the top plate, and the second support and the third support are strictly prohibited to be removed at the same time.
Preferably, in step S10, after the structural side wall is completed, the top plate is constructed as soon as possible, so that the length of the one-time pouring section can be reduced, the length of the working surface between the bottom plate, the side wall and the top plate can be shortened, the resource investment can be increased appropriately, the construction progress can be accelerated, the close connection of the working procedures can be realized, and the foundation pit can be ensured to be closed quickly. Before the top plate is sealed, the middle upright post cannot be cut in advance, and the middle upright post is dismantled in the hole after the structure is integrally formed.
Preferably, in step S12, accumulated water and impurities are drained before the foundation pit is backfilled, so that the length of a primary pouring section can be reduced, the length of a working surface between the bottom plate, the side wall and the top plate can be shortened, the resource investment can be increased appropriately, the construction progress can be accelerated, the close connection of working procedures can be realized, and the foundation pit can be rapidly sealed. During backfilling, the backfilling is horizontally and symmetrically backfilled, the backfilled soil needs to be tamped or rolled compactly in layers, the thickness of each layer is 200-300 mm, mechanical collision on the structure and the waterproof protective layer is avoided during backfilling, manual matching small-sized tamping machines are adopted to tamp and fill the structure and the top plate within 500mm range, when mechanical rolling is adopted, thin filling and full running are realized, the structure is light and heavy, rolling is repeatedly carried out, the driving speed is controlled according to mechanical performance, when manual tamping is carried out, the tamping bottom is overlapped, and the overlapping width is not less than 1/3 tamping bottom width.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. An open-cut construction method for sensitive building sections close to intercity railway tunnels is characterized by comprising the following steps: s1, measuring pile position control points by using a total station, and laying pile positions;
s2, constructing a cement mixing pile;
s3, constructing an isolation pile;
s4, constructing the underground continuous wall;
s5, constructing the lattice column;
s6, excavating a foundation pit;
s7, testing the groove on the substrate;
s8, constructing a bottom plate: pouring a cushion layer, constructing a waterproof layer of the bottom plate, binding the reinforcing steel bars of the bottom plate and pouring bottom plate concrete;
s9, reversing support and side wall construction;
s10, constructing a top plate;
s11, sealing the structural waterproof layer: laying a roof waterproof layer and pouring a waterproof protective layer;
and S12, backfilling the foundation pit.
2. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: and in the step S2, connecting a slurry storage tank slurry pump with a stirrer by using a slurry conveying rubber pipe, enabling the stirrer to stir along a guide frame, cutting soil and sink, after the soil is sunk to the designed depth, opening a slurry spraying port of the mortar pump, uniformly lifting the slurry spraying port, lifting while stirring the cement slurry and the soil body by a stirring blade until the cement slurry and the soil body are lifted to the designed pile top, and finishing a stirring process.
3. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S3, the isolation pile is drilled into a hole by rotary drilling, and a construction method of "jump-and-play three" is adopted.
4. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S4, the underground continuous wall adopts punching-grabbing combination, the mud protects the wall, the strong-effect wall-protection polymer mud is adopted, and the lifting height of the punching hammer is less than 1.5m each time.
5. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S5, sundries in the lattice column are cleaned before the lattice column is hoisted, the lattice column is arranged at the center of the steel reinforcement cage and is inserted into the foundation of the steel reinforcement cage by at least 2 m.
6. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S6, five points of "layering, substep, symmetry, balance, time limit" are mastered in the excavation process of the foundation pit, the construction principle of "vertical layering, longitudinal partition segmentation, supporting first and then excavation" is followed, the excavation is carried out to the designed supporting bottom and then the support is applied in time, and the earthwork below the designed supporting strength can be excavated when the supporting strength reaches the designed requirement.
7. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S8, the construction section is divided into 10m sections, the construction of the bottom plate is closely followed by the excavation surface, and the distance between the bottom plate and the last layer of earthwork slope toe is less than 2 m.
8. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in step S9, after the strength of the bottom plate concrete meets the requirement, the third support is removed, the side wall is constructed, the back support is timely applied after the side wall is completed, the second support is removed after the strength of the side wall concrete meets the requirement, the support removal number should be determined according to the construction length of the side wall or the top plate without removing the support and reversing the support in advance.
9. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S10, after the structure side wall is completed, the top plate construction is performed, before the top plate is sealed, the center pillar is not cut in advance, and the center pillar is removed in the hole after the structure is integrally formed.
10. The open-cut construction method for the proximity sensitive building segment of the inter-city railway tunnel according to claim 1, characterized in that: in the step S12, accumulated water and sundries are completely discharged before the foundation pit is backfilled, the foundation pit is backfilled horizontally and symmetrically, and the backfilled soil needs to be tamped in layers or compacted by rolling.
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| CN202010435706.6A CN111576483A (en) | 2020-05-21 | 2020-05-21 | Open-cut construction method for sensitive building section near intercity railway tunnel |
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| CN202010435706.6A CN111576483A (en) | 2020-05-21 | 2020-05-21 | Open-cut construction method for sensitive building section near intercity railway tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025005A (en) * | 2023-01-05 | 2023-04-28 | 北京住总集团有限责任公司 | Subway station main body structure construction method influenced by double rows of lattice columns |
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| CN108951647A (en) * | 2018-07-18 | 2018-12-07 | 中铁十二局集团第二工程有限公司 | Construction method for supporting is excavated in hole in the hole of open trench tunnel |
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2020
- 2020-05-21 CN CN202010435706.6A patent/CN111576483A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009174178A (en) * | 2008-01-24 | 2009-08-06 | Kajima Corp | Method of constructing underground structure |
| CN105735245A (en) * | 2016-03-17 | 2016-07-06 | 上海交通大学 | Soil body reinforcement method for trenching construction in stratum of seaside hydraulic fill mud layer |
| CN108867692A (en) * | 2018-07-18 | 2018-11-23 | 中铁十二局集团第二工程有限公司 | The protection of city big cross section open trench tunnel Nearby Structure and tunnel foundation pit method for digging |
| CN108951648A (en) * | 2018-07-18 | 2018-12-07 | 中铁十二局集团第二工程有限公司 | Open trench tunnel layer of sand Sand foundation ditch strengthening method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025005A (en) * | 2023-01-05 | 2023-04-28 | 北京住总集团有限责任公司 | Subway station main body structure construction method influenced by double rows of lattice columns |
| CN116025005B (en) * | 2023-01-05 | 2023-07-25 | 北京住总集团有限责任公司 | Subway station main body structure construction method influenced by double rows of lattice columns |
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Application publication date: 20200825 |