CN109706909A - The structures foundation reinforcing structure and its construction method worn under reply metro shield - Google Patents
The structures foundation reinforcing structure and its construction method worn under reply metro shield Download PDFInfo
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- CN109706909A CN109706909A CN201910129990.1A CN201910129990A CN109706909A CN 109706909 A CN109706909 A CN 109706909A CN 201910129990 A CN201910129990 A CN 201910129990A CN 109706909 A CN109706909 A CN 109706909A
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Abstract
The invention discloses the structures foundation reinforcing structures worn under a kind of reply metro shield, including graded broken stone layer and cement stabilizing soil layer, the upper surface of graded broken stone layer and the lower surface flush of structure base, the lower surface of graded broken stone layer connect with cement stabilizing soil layer；Graded broken stone layer and cement stabilizing soil layer are respectively positioned on the top of the subway line in planning；Several vertically arranged cement mixing piles are uniformly provided in the soil body below cement stabilizing soil layer, the top of cement mixing pile connects with cement stabilizing soil layer.The invention also discloses the construction methods of above-mentioned foundation structure.The present invention effectively enhances the self-stable ability of the soil body, can resist and be evenly distributed with the load of transmitting from below, avoid the basic local pressure of structures excessive, effectively reduce adverse effect when shield machine passes through to structures.By the way that graded broken stone layer is arranged, deformation can be absorbed, further ensures that the stabilization of structures above shield machine.
Description
Technical field
The present invention relates to technical field of building construction.
Background technique
Current social carries out underground engineering construction extensively, and underground engineering construction equally exists successive problem and crossings on different level is asked
Topic can generate adverse effect to existing structure above, cause when metro shield passes through under built underground structure
The position of the underground structure built up changes and (may move up or tilt).Currently, not yet before carrying out Underground Construction
The technical solution for considering subway crossing problem in advance, cannot prevent from wearing structures under metro shield and cause bad shadow to structures
It rings.
Metro shield causes uplift of soil reason: 1, swelling in face of shield tunneling mainly since soil pressure (muddy water pressure) controls
It is worth excessive and causes soil body elastic-plastic deformation immediately ahead of shield machine, so that stratum is caused to swell.2, protuberance when shield machine passes through is
It swells on stratum caused by due to bored top, deficient digging, friction of shield shell and the soil body etc..3, it is logical to appear in shield tail for shield tail portion protuberance
After crossing, the outer diameter of general shield is bigger than the outer diameter of tunnel-liner, exists between shield shell outer surface and lining cutting outer surface certain empty
Gap needs to fill, if filling grouting pressure is excessive, bottom can be caused to swell.
Summary of the invention
The purpose of the present invention is to provide the structures foundation reinforcing structures worn under a kind of reply metro shield, it is ensured that reduces
Or eliminate adverse effect of shield machine when passing through to structures.
To achieve the above object, the present invention provides the structures foundation reinforcing structure worn under a kind of reply metro shield,
The structures are located at the top of the subway line in planning, and structures have basis,
Including graded broken stone layer and cement stabilizing soil layer, the upper surface of graded broken stone layer and the lower surface of structure base are equal
Together, the lower surface of graded broken stone layer connects with cement stabilizing soil layer；Graded broken stone layer and cement stabilizing soil layer are respectively positioned in planning
Subway line top；Several vertically arranged cement mixing piles, water are uniformly provided in the soil body below cement stabilizing soil layer
The top of mud mixing pile connects with cement stabilizing soil layer, and the bottom end of cement mixing pile is lower than the subway line in planning.
The bottom end of cement mixing pile is lower than 50 centimetres of the bottom end of subway line or more in planning；Graded broken stone layer and cement
The thickness of steady soil is 30 centimetres, and the diameter of the cement mixing pile is 60 centimetres.
The present invention also provides a kind of construction method for the structures foundation reinforcing structure worn under above-mentioned reply metro shield,
It carries out before structures are constructed, successively sequentially includes the following steps:
First step is the pass course of determining shield machine；
Second step is constructed vertically arranged cement mixing pile along the pass course of shield machine, the setting area of cement mixing pile
Domain is: the region for being included after the distance for peripherally and outwardly extending a shield outer diameter of structures；Cement mixing pile is set at it
It sets in region and is uniformly distributed；
The upper end of cement mixing pile is equal to or higher than the foundation pit bottom design position of structures, and the lower end of cement mixing pile is lower than shield
The pass course of machine；
Third step is the pass course along shield machine, excavates structure pit extremely design foundation pit bottom position, will in digging process
It abolishes the part that cement mixing pile is located above structure pit bottom；Cleaning is tamped behind foundation pit bottom, is flattened；
Four steps is to tamp in two layers of the laying cement stabilizing soil layer in foundation pit bottom point and successively, and every layer of cement stabilizing soil thickness is
15 centimetres, two layers of laying graded broken stone layer is divided in the cement steady soil of upper layer and is successively tamped, every level matches fractured-rock layer thickness
It is 15 centimetres,
The lower end flush on the basis of the upper surface and structures of the graded broken stone layer after ensuring to tamp.
In third step, 60 centimetres of ground beneath of excavation superstructure to structures；In four steps, cement stabilized soil
The laying depth of layer and graded broken stone layer is 30 centimetres.
The present invention has the advantage that:
The present invention effectively enhances the certainly steady of the soil body by being uniformly arranged cement mixing pile in advance at the pass course of shield machine
Ability.By presetting cement stabilizing soil layer, energy above at the pass course of shield machine, below scheduled structure base
The load (i.e. shield machine by when the load that generates) of transmitting from below is enough resisted and be evenly distributed with, it is logical on the one hand to reduce shield machine
The active force on the out-of-date basis to structures, on the other hand avoids the basic local pressure of structures excessive.
By the way that graded broken stone layer is arranged, deformation can be absorbed, further ensures that the stable structure of structures above shield machine
Property.
Construction method of the invention can quickly and effectively set up the structures worn under the reply metro shield through strengthening
Foundation reinforcing structure, the basis as subsequent construction structures.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is schematic top plan view when shield machine passes through at shield machine.
Specific embodiment
As depicted in figs. 1 and 2, the invention discloses the structures foundation reinforcing structure worn under a kind of reply metro shield,
The structures are located at the top of the subway line in planning, and structures have basis.
The structures foundation reinforcing structure worn under reply metro shield of the invention includes graded broken stone layer 1 and cement stabilizing
Soil layer 2, the upper surface of graded broken stone layer 1 and the lower surface flush of structure base, the lower surface of graded broken stone layer 1 and cement
Steady soil 2 connects；Graded broken stone layer 1 and cement stabilizing soil layer 2 are respectively positioned on the top of the subway line in planning；Cement stabilizing
Several vertically arranged cement mixing piles 3 are uniformly provided in the soil body of 2 lower section of soil layer, the top of cement mixing pile 3 and cement are steady
Determine soil layer 2 to connect, the bottom end of cement mixing pile 3 is lower than the subway line in planning.
The bottom end of cement mixing pile 3 is lower than 50 centimetres of the bottom end of subway line or more in planning；Graded broken stone layer 1 and water
The thickness of mud steady soil 2 is 30 centimetres, and the diameter of the cement mixing pile 3 is 60 centimetres.
The invention also discloses the construction methods for the structures foundation reinforcing structure worn under above-mentioned reply metro shield, in structure
It is successively sequentially included the following steps: before building object construction
First step is the position for determining the subway line in planning, so that it is determined that the pass course of shield machine 4；
Second step is the cement mixing pile 3 for constructing vertically arranged along the pass course of shield machine 4, the setting of cement mixing pile 3
Region is: the region for being included after the distance for peripherally and outwardly extending a shield outer diameter of structures；Cement mixing pile 3 is at it
It is uniformly distributed in setting area；The upper end of cement mixing pile 3 is equal to or higher than the design position at the foundation pit bottom of structures, and cement stirs
The lower end for mixing stake 3 is lower than the pass course of shield machine 4；
Third step is the pass course along shield machine 4, excavates structure pit to foundation pit bottom position；By cement in digging process
It abolishes the part that mixing pile 3 is located above structure pit bottom；Cleaning is tamped behind foundation pit bottom, is flattened.
Four steps is to tamp in two layers of the laying cement stabilizing soil layer in foundation pit bottom point and successively, every layer of cement stabilized soil thickness
Degree is 15 centimetres, and two layers of laying graded broken stone layer 1 is divided on cement stabilizing soil layer 2 and is successively tamped, every level matches rubble thickness
Degree is 15 centimetres；The lower end flush on the basis of the upper surface and structures of the graded broken stone layer 1 after ensuring to tamp.
After four steps, the construction of the bed course of progress structures, basis and main body on graded broken stone layer 1.
In third step, 60 centimetres of ground beneath of excavation superstructure to structures；In four steps, cement stabilized soil
The laying depth of layer 2 and graded broken stone layer 1 is 30 centimetres.
This construction method can also first construct in advance to the cement mixing pile outside the range of structure pit bottom, be excavated to away from foundation pit
It constructs again when the 20 centimetres of high positions in bottom remaining cement mixing pile.
After the structures foundation reinforcing structure construction worn under reply metro shield in the present invention, it can be constructed
The construction of object.After structures are constructed, through after a period of time after (such as several years), shield-tunneling construction is carried out below structures
When, shield machine 4 is passed through by scheduled by route, by when the cement mixing pile 3 on route abolished, to build subway line
Road section.Shield machine 4 by when, since shield machine direction of advance and its surrounding soil are reinforced by cement mixing pile 3, soil
Body self-stability is good, and more difficult compared to the common natural soil body sediment failure phenomenon occur.Before the appearance of uplift of soil phenomenon, water
Mud steady soil 2 can intercept the active force transmitted from bottom to top, on the one hand weaken upward active force, on the other hand will be upward
Active force spread out, upward pressure is greatly lowered, the higher trend of local eminence is reduced to whole protuberance upwards
Very low trend significantly reduces the height of protuberance.Graded broken stone layer 1 has the ability for absorbing deformation, so that graded broken stone layer 1
The structures of top are barely affected.After the advance of shield machine 4, upward active force calms down at this, and cement stabilizing soil layer 2 can
Local damage can occur, but this structural failure absorbs upward active force, enhance the stability of foundation structure.Gradation is broken
Rock layers 1 occur certain deformation in stress and absorb active force.In short, using foundation structure and construction method of the invention, energy
It is enough construct below structures subway line when, protect structures not by shield machine 4 by when upward active force influenced, avoid
Top structures are damaged when subway line construction.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (4)
1. the structures foundation reinforcing structure worn under reply metro shield, the structures are located at the upper of the subway line in planning
Side, structures have basis,
It is characterized by comprising graded broken stone layer and cement stabilizing soil layer, the upper surface of graded broken stone layer and structure base
The lower surface of lower surface flush, graded broken stone layer connects with cement stabilizing soil layer；Graded broken stone layer and cement stabilizing soil layer are equal
The top of subway line in planning；Several vertically arranged cement are uniformly provided in the soil body below cement stabilizing soil layer
The top of mixing pile, cement mixing pile connects with cement stabilizing soil layer, and the bottom end of cement mixing pile is lower than the subway line in planning
Road.
2. the structures foundation reinforcing structure worn under reply metro shield according to claim 1, it is characterised in that: cement
The bottom end of mixing pile is lower than 50 centimetres of the bottom end of subway line or more in planning；The thickness of graded broken stone layer and cement stabilizing soil layer
Degree is 30 centimetres, and the diameter of the cement mixing pile is 60 centimetres.
3. the construction method for the structures foundation reinforcing structure worn under reply metro shield described in claims 1 or 2, in structure
It is carried out before building object construction, it is characterised in that successively sequentially include the following steps:
First step is the pass course of determining shield machine；
Second step is constructed vertically arranged cement mixing pile along the pass course of shield machine, the setting area of cement mixing pile
Domain is: the region for being included after the distance for peripherally and outwardly extending a shield outer diameter of structures；Cement mixing pile is set at it
It sets in region and is uniformly distributed；
The upper end of cement mixing pile is equal to or higher than the foundation pit bottom design position of structures, and the lower end of cement mixing pile is lower than shield
The pass course of machine；
Third step is the pass course along shield machine, excavates structure pit extremely design foundation pit bottom position, will in digging process
It abolishes the part that cement mixing pile is located above structure pit bottom；Cleaning is tamped behind foundation pit bottom, is flattened；
Four steps is to tamp in two layers of the laying cement stabilizing soil layer in foundation pit bottom point and successively, and every layer of cement stabilizing soil thickness is
15 centimetres, two layers of laying graded broken stone layer is divided in the cement steady soil of upper layer and is successively tamped, every level matches fractured-rock layer thickness
It is 15 centimetres,
The lower end flush on the basis of the upper surface and structures of the graded broken stone layer after ensuring to tamp.
4. construction method according to claim 3, it is characterised in that: in third step, excavate superstructure to structures
60 centimetres of ground beneath；In four steps, the laying depth of cement stabilizing soil layer and graded broken stone layer is 30 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129990.1A CN109706909A (en) | 2019-02-21 | 2019-02-21 | The structures foundation reinforcing structure and its construction method worn under reply metro shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129990.1A CN109706909A (en) | 2019-02-21 | 2019-02-21 | The structures foundation reinforcing structure and its construction method worn under reply metro shield |
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| CN109706909A true CN109706909A (en) | 2019-05-03 |
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| CN201910129990.1A Pending CN109706909A (en) | 2019-02-21 | 2019-02-21 | The structures foundation reinforcing structure and its construction method worn under reply metro shield |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738381A (en) * | 2021-09-23 | 2021-12-03 | 北京市政建设集团有限责任公司 | Construction method for pile body at junction of underground excavation station and shield region |
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| BE849748A (en) * | 1975-12-22 | 1977-04-15 | DEVICE FOR DIGGING TUNNELS UNDER HYDRAULIC PROTECTION | |
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| CN104846829A (en) * | 2014-02-18 | 2015-08-19 | 宏润建设集团股份有限公司 | Shield-reserved penetration composite type foundation pit support wall and construction method thereof |
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| CN209619985U (en) * | 2019-02-21 | 2019-11-12 | 郑州市市政工程总公司 | The structures foundation reinforcing structure worn under reply metro shield |
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2019
- 2019-02-21 CN CN201910129990.1A patent/CN109706909A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| BE849748A (en) * | 1975-12-22 | 1977-04-15 | DEVICE FOR DIGGING TUNNELS UNDER HYDRAULIC PROTECTION | |
| CN201695407U (en) * | 2010-05-04 | 2011-01-05 | 中国水电顾问集团华东勘测设计研究院 | Enclosure structure of foundation pit of subway station with downwards penetrating shield tunnel |
| CN102061923A (en) * | 2010-11-28 | 2011-05-18 | 山东科技大学 | Tunnel construction method capable of protecting existing building |
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| CN104533434A (en) * | 2014-12-28 | 2015-04-22 | 上海隧道工程股份有限公司 | Construction method of rectangular ultra-shallow covered soil tunnel |
| CN106759458A (en) * | 2017-02-13 | 2017-05-31 | 中铁十九局集团轨道交通工程有限公司 | The U-shape structure of bridge pile foundation underpins transfer system and its applies method |
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| 田海波等: "新建隧道下方预留盾构穿越条件的结构设计", 《中国市政工程》, no. 02, pages 30 - 33 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738381A (en) * | 2021-09-23 | 2021-12-03 | 北京市政建设集团有限责任公司 | Construction method for pile body at junction of underground excavation station and shield region |
| CN113738381B (en) * | 2021-09-23 | 2023-11-14 | 北京市政建设集团有限责任公司 | Construction method for pile body at joint of underground excavation station and shield zone |
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