CN106884432A - Foundation pit supporting construction and its construction method - Google Patents
Foundation pit supporting construction and its construction method Download PDFInfo
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- CN106884432A CN106884432A CN201710266887.2A CN201710266887A CN106884432A CN 106884432 A CN106884432 A CN 106884432A CN 201710266887 A CN201710266887 A CN 201710266887A CN 106884432 A CN106884432 A CN 106884432A
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- Prior art keywords
- foundation pit
- anchoring
- girder
- supporting construction
- construction
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Classifications
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The present invention relates to a kind of foundation pit supporting construction, and the foundation pit supporting construction construction method, belong to the foundation pit stope support technical field of Geotechnical Engineering.Foundation pit supporting construction in the present invention, including girder, secondary beam, breast boards and anchoring beam, girder is in foundation pit side-wall surface longitudinal interval setting, secondary beam is horizontally arranged at interval on foundation pit side-wall surface, the Vierendeel girder that girder is formed after being connected with secondary beam is used to lay breast boards, anchoring beam one end is connected on Vierendeel girder, the other end stretches into anchoring in foundation pit side-wall, and one end of anchoring is preferably provided with expanding termination.Foundation pit supporting construction generally reinforced concrete structure.Anchoring beam is preferably attached on girder；The junction of anchoring beam and girder is also laid with moment reinforcement in reinforced concrete structure.Anchoring beam is preferably is located at slide surface lower section with being obliquely installed.Structure type of the present invention is simple, intensity is high, good rigidity, Construction Vibration are small, low cost, is particularly suited for the hard Geotechnical Environment in top weakness bottom.
Description
Technical field
The present invention relates to a kind of foundation pit supporting construction, and the foundation pit supporting construction construction method, category Geotechnical Engineering
Foundation pit stope support technical field.
Background technology
In engineering construction, the similar foundation ditch of top miscellaneous fill, the hard rock-soil layer in bottom can be usually run into, inevitably
The stability problem of Geotechnical Engineering pattern foundation pit supporting structure can be related to.The collapse accident of foundation ditch not only brings serious damage to national economy
Lose, and life and property to the people also constitutes grave danger.
Current foundation pit supporting method, mainly there is soil nailing anchoring support, diaphram wall supporting, sheet pile supporting, campshed branch
Shield.Soil nailing anchoring support, diaphram wall supporting do not need stake machine operation, and impact shock is small during construction, noise is low, be easily controlled
The deformation of foundation ditch.Sheet pile supporting, campshed supporting construction site requirements are higher, are suitable for various more complicated geological environments.
The supporting construction resistance to overturning that sheet pile supporting, campshed supporting are formed is preferable, but plant equipment high cost, quantities
Greatly.Armored concrete diaphram wall is a kind of structure type also higher with rotary digging stake cost than artificial digging pile stake, and is given up
Mud conditioning is difficult, easily causes environmental pollution.Soil nailing anchoring support several support patterns relatively above, cost is relatively low, construction
It is convenient, environmental protection, but its surface layer resistant function very little, soil nailing spacing is laid relatively closely, and soil nailing insertion soil body depth is needed
Very long, construction gets up to show slightly difficult.
The content of the invention
The technical problems to be solved by the invention are：There is provided that a kind of structure type is simple, the base good to pattern foundation pit supporting structure effect
Pit supporting construction, the supporting construction form intensity is high, good rigidity, Construction Vibration are small, low cost.
It is to solve above-mentioned technical problem the technical solution adopted in the present invention：Foundation pit supporting construction, including it is girder, secondary
Beam, breast boards and anchoring beam, girder set in foundation pit side-wall surface longitudinal interval setting, secondary beam in foundation pit side-wall surface lateral separation
Put, the Vierendeel girder that girder is formed after being connected with secondary beam is used to lay breast boards, anchoring beam one end is connected on Vierendeel girder, another
Stretch into anchoring in foundation pit side-wall in end.
Used as further scheme of the invention, girder, secondary beam, breast boards and anchoring beam are reinforced concrete structure.
Used as further scheme of the invention, anchoring beam is connected on girder；The junction of anchoring beam and girder is in reinforcing bar
Moment reinforcement is also laid with concrete structure.
Used as further scheme of the invention, anchoring beam is located at slide surface lower section；Anchoring beam is obliquely installed, and anchors beam
The one end for stretching into anchoring in foundation pit side-wall is the one end in lower compared to the other end；Anchor beam is with the angle of horizontal plane
15 ° to 20 °.
Used as further scheme of the invention, one end that anchoring beam stretches into anchoring in foundation pit side-wall has expansion termination.
Correspondingly, the present invention also provides the construction method of above-mentioned foundation pit supporting construction, and construction procedure is：
First, preparation：According to geological condition complete design drawing；The foundation pit supporting construction for using for：Including girder, secondary
Beam, breast boards and anchoring beam, girder set in foundation pit side-wall surface longitudinal interval setting, secondary beam in foundation pit side-wall surface lateral separation
Put, the Vierendeel girder that girder is formed after being connected with secondary beam is used to lay breast boards, anchoring beam one end is connected on Vierendeel girder, another
Stretch into anchoring in foundation pit side-wall in end；
2nd, top excavation of foundation pit：Anchoring beam is top foundation ditch with foundation ditch part more than Vierendeel girder junction, according to design
Drawing, from depositional gradient upper thread excavation pit soil, is excavated to top foundation ditch using classification；
3rd, the supporting construction of top foundation ditch makes：After having excavated per one-level foundation ditch, corresponding level foundation ditch is carried out immediately
Girder, secondary beam, the reinforcement fabrication and casting concrete of breast boards, until completing top pattern foundation pit supporting structure；
4th, drilling construction：After top pattern foundation pit supporting structure is completed, drilling construction is carried out, until the projected depth of anchoring beam；
5th, anchoring beam makes：After completing drilling construction, anchor reinforcing bar colligation and the casting concrete of beam；
6th, bottom excavation of foundation pit：According to design drawing, the foundation pit earth to bottom is excavated using classification；
7th, the supporting construction of bottom foundation ditch makes：After having excavated per one-level foundation pit earth, corresponding level foundation ditch is carried out immediately
Girder, secondary beam, the reinforcement fabrication and casting concrete of breast boards, until excavating to design of foundation pit line, complete bottom foundation ditch branch
Shield.
Used as further scheme of the invention, in foundation pit supporting construction, anchoring beam is located at slide surface lower section；Anchoring beam inclines
Tiltedly set, and anchor beam to stretch into the one end anchored in foundation pit side-wall is the one end in lower compared to the other end；Anchoring beam
It it is 15 ° to 20 ° with the angle of horizontal plane；In the preparation described in step one, according to geological condition, analyzed by soil stabilization
Method calculates soil body deadweight G and soil pressure F, determines after the position of slide surface and the bore position of anchoring beam, then carries out again
Layout design.
Used as further scheme of the invention, in foundation pit supporting construction, anchoring beam is connected on girder；Anchoring Liang Hezhu
The junction of beam is also laid with moment reinforcement in reinforced concrete structure；The colligation of moment reinforcement is in the anchoring described in step 5
Beam is carried out in making.
As further scheme of the invention, in the drilling construction described in step 4, drilling to the design depth for anchoring beam
After degree, reaming is carried out at bottom hole end, formed and expand termination.
The beneficial effects of the invention are as follows：
1st, " fourth " font foundation pit supporting construction is formed, by soil pressure and soil body Gravitative Loads on anchoring beam so that main
Beam is subject to the pulling force in crater wall, and limitation secondary beam and breast boards are held in crater wall, the purpose for covering pressure are reached, so as to improve supporting
The stability of structure.
2nd, expansion termination is formed by the reaming of anchoring beam end, when top foundation pit supporting construction is subject to larger soil pressure
When, play a part of resistance to plucking, the resistance to capsizing of supporting construction is improve, increased the security of supporting construction.
3rd, foundation pit supporting construction is reinforced concrete structure, and intensity is high, good rigidity, and by girder and anchoring beam
Junction, addition bend reinforcing bar increased the rigidity of " fourth " font structure, and soil pressure and soil body deadweight are effectively decomposed and passed
Pass, so as to improve the stability of whole supporting construction.
4th, foundation pit supporting construction uses the supporting when excavating, it is ensured that the stability of foundation ditch, it is not necessary to use big machinery
Equipment, noise is small, short time limit, low engineering cost.
The present invention is mainly suitable for the hard Geotechnical Environment in top weakness bottom, it is mainly used in diadactic structure environment
Slope retaining, pattern foundation pit supporting structure.
Brief description of the drawings
Fig. 1 is the generalized section of foundation pit supporting construction in the present invention；
Fig. 2 is the positive elevational schematic view of foundation pit supporting construction in the present invention；
Parts, position and numbering in figure：1- foundation pit earths；2- depositional gradient upper threads；3- slide surfaces；4- girders；5- anchors beam；
6- expands termination；7- secondary beams；8- breast boards；9- design of foundation pit lines；10- addition bend muscle；The G- soil bodys are conducted oneself with dignity；F- soil pressures.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
As shown in Figure 1 and Figure 2, for foundation pit supporting construction, including girder 4, secondary beam 7, breast boards 8 and anchoring beam 5, girder 4
In foundation pit side-wall surface longitudinal interval setting, secondary beam 7 is horizontally arranged at interval on foundation pit side-wall surface, and girder 4 is connected with secondary beam 7
The Vierendeel girder for being formed afterwards is used to lay breast boards 8, and anchoring beam 5 one end is connected on Vierendeel girder, the other end is stretched into foundation pit side-wall
Anchoring.Wherein anchoring beam 5 is preferably attached on girder 4.In the present invention, anchoring beam 5 is relative to girder 4, secondary beam 7, the shape of breast boards 8
Into " fourth " font supporting construction, by soil pressure and soil body Gravitative Loads on anchoring beam 5 so that girder 4 is subject to in crater wall
Pulling force, limitation secondary beam 7 and breast boards 8 be held in crater wall, the purpose for covering pressure is reached, so as to improve the stabilization of supporting construction
Property.
Girder 4, secondary beam 7, breast boards 8 and anchoring beam 5 preferably use reinforced concrete structure, and its intensity is high, good rigidity；
In addition, the junction of anchoring beam 5 and girder 4 is also laid with moment reinforcement 10 in reinforced concrete structure, " fourth " word is increased
The rigidity of type structure, soil pressure and soil body deadweight are effectively decomposed and transmitted, so as to improve the stabilization of whole supporting construction
Property.
Preferably, anchoring beam 5 is located at the lower section of slide surface 3；Anchor beam 5 to be obliquely installed, and anchor beam 5 and stretch into foundation pit side-wall
One end of interior anchoring is the one end in lower compared to the other end；Anchoring beam 5 is 15 ° to 20 ° with the angle of horizontal plane；And anchor
Gu the depth of beam 5 need to act on the reaction force on breast boards and girder and determine according to soil pressure F and soil body deadweight G.Using this
Structure, can improve the stability of whole supporting construction.
Preferably, anchoring beam 5 stretches into one end of anchoring in foundation pit side-wall with expansion termination 6.When top pattern foundation pit supporting structure knot
When structure is subject to larger soil pressure, play a part of resistance to plucking, improve the resistance to capsizing of supporting construction, increased supporting construction
Security.
For the construction method of the foundation pit supporting construction of above preferred embodiment, construction procedure is：
First, preparation：According to geological condition, soil body deadweight G and soil pressure F is calculated by soil stabilization analytic approach, it is determined that
Go out after the position of slide surface 3 and the bore position of anchoring beam 5, carry out layout design, complete the design drawing of foundation pit supporting construction
Paper；
2nd, top excavation of foundation pit：Anchoring beam 5 is top foundation ditch with foundation ditch the part more than junction of girder 4, according to design
Drawing, from the excavation pit soil 1 of depositional gradient upper thread 2, is excavated to top foundation ditch using classification；
3rd, the supporting construction of top foundation ditch makes：After having excavated per one-level foundation ditch, corresponding level foundation ditch is carried out immediately
Girder 4, secondary beam 7, the reinforcement fabrication and casting concrete of breast boards 8, until completing top pattern foundation pit supporting structure；During casting concrete,
Need to be from the reserved 2.0m of anchoring beam drill hole, the casting concrete again after colligation completes addition bend muscle 10；
4th, drilling construction：After top pattern foundation pit supporting structure is completed, drilling construction is carried out, until the projected depth of anchoring beam 5,
And reaming is carried out at bottom hole end, expand termination 6 to be formed；
5th, anchoring beam 5 makes：After completing drilling construction, anchor reinforcing bar colligation and the casting concrete of beam 5；Entering
When row anchoring beam steel 5 makes, the making of addition bend muscle 10, and casting concrete need to be completed；When anchoring beam 5 makes, in anchor
Gu beam 5 and the junction of girder 4, need to downwards excavate part soil, the making space of addition bend muscle is reserved；
6th, bottom excavation of foundation pit：According to design drawing, the foundation pit earth 1 to bottom is excavated using classification；
7th, the supporting construction of bottom foundation ditch makes：After having excavated per one-level foundation pit earth, corresponding level foundation ditch is carried out immediately
Girder 4, secondary beam 7, the reinforcement fabrication and casting concrete of breast boards 8, until excavating to design of foundation pit line 9, complete bottom base
Hole supporting.
Claims (9)
1. foundation pit supporting construction, it is characterised in that：Including girder (4), secondary beam (7), breast boards (8) and anchoring beam (5), girder
(4) in foundation pit side-wall surface longitudinal interval setting, secondary beam (7) is horizontally arranged at interval on foundation pit side-wall surface, girder (4) and secondary beam
(7) Vierendeel girder formed after being connected is used to lay breast boards (8), and beam (5) one end is connected on Vierendeel girder, the other end is stretched for anchoring
Enter anchoring in foundation pit side-wall.
2. foundation pit supporting construction as claimed in claim 1, it is characterised in that：Girder (4), secondary beam (7), breast boards (8) and anchor
Gu Liang (5) is reinforced concrete structure.
3. foundation pit supporting construction as claimed in claim 2, it is characterised in that：Anchoring beam (5) is connected on girder (4)；Anchoring
The junction of beam (5) and girder (4) is also laid with moment reinforcement (10) in reinforced concrete structure.
4. foundation pit supporting construction as claimed in claim 1, it is characterised in that：Anchoring beam (5) is located at slide surface (3) lower section；Anchor
Gu Liang (5) is obliquely installed, and anchor beam (5) to stretch into the one end anchored in foundation pit side-wall is in lower compared to the other end
One end；Anchoring beam (5) is 15 ° to 20 ° with the angle of horizontal plane.
5. the foundation pit supporting construction as described in any one in Claims 1-4, it is characterised in that：Foundation ditch is stretched into anchoring beam (5)
One end of anchoring has expansion termination (6) in the wall of side.
6. the construction method of foundation pit supporting construction, it is characterised in that construction procedure is：
First, preparation：Using foundation pit supporting construction as claimed in claim 1, according to geological condition complete design drawing；
2nd, top excavation of foundation pit：Anchoring beam (5) is top foundation ditch with foundation ditch part more than Vierendeel girder junction, according to design
Drawing, from depositional gradient upper thread (2) excavation pit soil (1), is excavated to top foundation ditch using classification；
3rd, the supporting construction of top foundation ditch makes：After having excavated per one-level foundation ditch, the girder of corresponding level foundation ditch is carried out immediately
(4), secondary beam (7), the reinforcement fabrication and casting concrete of breast boards (8), until completing top pattern foundation pit supporting structure；
4th, drilling construction：After top pattern foundation pit supporting structure is completed, drilling construction is carried out, until the projected depth of anchoring beam (5)；
5th, anchoring beam (5) makes：After completing drilling construction, reinforcing bar colligation and the casting concrete of anchoring beam (5) are carried out；
6th, bottom excavation of foundation pit：According to design drawing, the foundation pit earth (1) to bottom is excavated using classification；
7th, the supporting construction of bottom foundation ditch makes：After having excavated per one-level foundation pit earth, the master that corresponding level foundation ditch is carried out immediately
Beam (4), secondary beam (7), the reinforcement fabrication and casting concrete of breast boards (8), until excavating to design of foundation pit line (9), under completion
Portion's pattern foundation pit supporting structure.
7. the construction method of foundation pit supporting construction as claimed in claim 6, it is characterised in that：In foundation pit supporting construction, anchor
Gu Liang (5) is located at slide surface (3) lower section；Anchor beam (5) to be obliquely installed, and anchor beam (5) and stretch into anchoring in foundation pit side-wall
One end is the one end in lower compared to the other end；Anchoring beam (5) is 15 ° to 20 ° with the angle of horizontal plane；Step one institute
In the preparation stated, according to geological condition, the soil body deadweight (G) and soil pressure (F) are calculated by soil stabilization analytic approach, determined
After the position of slide surface (3) and the bore position of anchoring beam (5), layout design is then carried out again.
8. the construction method of foundation pit supporting construction as claimed in claim 6, it is characterised in that：In foundation pit supporting construction, anchor
Gu Liang (5) is connected on girder (4)；The junction of anchoring beam (5) and girder (4) is also laid with curved in reinforced concrete structure
Bent reinforcing bar (10)；The colligation of moment reinforcement (10) is carried out in the anchoring beam described in step 5 makes.
9. the construction method of the foundation pit supporting construction as described in any one in claim 6 to 8, it is characterised in that：In step
In drilling construction described in four, after the projected depth of drilling to anchoring beam (5), reaming is carried out at bottom hole end, formed and expand termination
(6)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710266887.2A CN106884432A (en) | 2017-04-21 | 2017-04-21 | Foundation pit supporting construction and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710266887.2A CN106884432A (en) | 2017-04-21 | 2017-04-21 | Foundation pit supporting construction and its construction method |
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| Publication Number | Publication Date |
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| CN106884432A true CN106884432A (en) | 2017-06-23 |
Family
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| CN201710266887.2A Pending CN106884432A (en) | 2017-04-21 | 2017-04-21 | Foundation pit supporting construction and its construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301417A (en) * | 2018-01-04 | 2018-07-20 | 刘动 | Using the foundation pit supporting construction and construction method of mini pile |
| CN109235448A (en) * | 2018-10-11 | 2019-01-18 | 安徽省城建设计研究总院股份有限公司 | A kind of horizontal arch shell foundation pit supporting method |
| CN109701984A (en) * | 2019-02-27 | 2019-05-03 | 中交路桥建设有限公司 | A kind of environment-friendly type dregs hole mud retaining net |
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| JP2007154413A (en) * | 2005-11-30 | 2007-06-21 | Marui Kensetsu:Kk | Soldier pile type earth retaining anchor type retaining wall and its construction method |
| CN102330432A (en) * | 2011-06-16 | 2012-01-25 | 兰州理工大学 | Panel-type framework prestressed anchor rod flexible support structure and construction method thereof |
| CN204875804U (en) * | 2015-08-17 | 2015-12-16 | 中铁第四勘察设计院集团有限公司 | A intersecting structure is exempted from to plane Y type longeron arrangement of reinforcement for underground works |
| CN205077499U (en) * | 2015-11-04 | 2016-03-09 | 云南建工集团有限公司 | Double row pile supporting construction with transverse connection component |
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2017
- 2017-04-21 CN CN201710266887.2A patent/CN106884432A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007154413A (en) * | 2005-11-30 | 2007-06-21 | Marui Kensetsu:Kk | Soldier pile type earth retaining anchor type retaining wall and its construction method |
| CN102330432A (en) * | 2011-06-16 | 2012-01-25 | 兰州理工大学 | Panel-type framework prestressed anchor rod flexible support structure and construction method thereof |
| CN204875804U (en) * | 2015-08-17 | 2015-12-16 | 中铁第四勘察设计院集团有限公司 | A intersecting structure is exempted from to plane Y type longeron arrangement of reinforcement for underground works |
| CN205077499U (en) * | 2015-11-04 | 2016-03-09 | 云南建工集团有限公司 | Double row pile supporting construction with transverse connection component |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301417A (en) * | 2018-01-04 | 2018-07-20 | 刘动 | Using the foundation pit supporting construction and construction method of mini pile |
| CN108301417B (en) * | 2018-01-04 | 2019-08-30 | 深圳市岩土综合勘察设计有限公司 | Using the foundation pit supporting construction and construction method of mini pile |
| CN109235448A (en) * | 2018-10-11 | 2019-01-18 | 安徽省城建设计研究总院股份有限公司 | A kind of horizontal arch shell foundation pit supporting method |
| CN109701984A (en) * | 2019-02-27 | 2019-05-03 | 中交路桥建设有限公司 | A kind of environment-friendly type dregs hole mud retaining net |
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Application publication date: 20170623 |