CN102943480B - Loess foundation pit supporting method - Google Patents
Loess foundation pit supporting method Download PDFInfo
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- CN102943480B CN102943480B CN201210379484.6A CN201210379484A CN102943480B CN 102943480 B CN102943480 B CN 102943480B CN 201210379484 A CN201210379484 A CN 201210379484A CN 102943480 B CN102943480 B CN 102943480B
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- draining
- foundation pit
- round steel
- steel pipe
- supporting
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Abstract
The invention discloses a loess foundation pit supporting method, which comprises the following steps: throwing water draining traction pipes (2) into to-be-supported boundary walls (1) of a foundation pit by a certain dip angle that beta is equal to 5 to 10 degrees; keeping length of the water draining traction pipes (2) out of the boundary walls (1) at 20 to 30 cm; fixedly connecting draw bars (5) with top ends of the water draining traction pipes (2) through connecting holes (31) at the centers of bow-shaped supports (3), and keeping two ends of the bow-shaped supports (3) in contact with the supporting boundary walls (1) through mounting plates (4). Compared with the prior art, the loess foundation pit supporting method has the following advantages: (1) a scheme can solve both the water draining and the supporting problems; (2) the supporting at the bottom of the foundation pit is not needed, so that the occupation problem of the construction plant at the later stage is solved; (3) large construction machinery is neither required, nor long term work; (4) the supporting device can be repeatedly used for many times, and simply processed.
Description
Technical field
The present invention relates to building field, in particular a kind of loess foundation pit supporting method.
Background technology
Under the effect of upper overburden layer selfweight stress, or under selfweight stress and subsidiary stress acting in conjunction, the soil that remarkable additional deformation occurs because of the structural deterioration of soil after soaking is called collapsible soil, belongs to special soils.Be distributed widely in loess many tools settlement by soaking of China northeast, northwest, Central China and some areas, East China.
Loess embankment is a kind of special continent rickle in the Quaternary Period, and character is special.Loess has higher intensity when drying, and shows obvious settlement by soaking after meeting water, and this is determined by the constituent structure of loess itself.Containing 60 multi mineral in loess, based on detrital mineral, and containing part clay mineral.Quartz, feldspar, carbonatite is mainly in detrital mineral; The clay mineral overwhelming majority is hydromica, and has a small amount of montmorillonite and kaolinite etc.Lyotropic salt, middle dissolved salt and organic content are less.The structural system forming loess is skeleton particle, and its form and type of attachment have influence on the degree of consolidation of structural system, and its arrangement mode decides the stability of structural system.Collapsible loess generally all forms granular built on stilts point cantact or half cementing form, and saturated yielding degree and the intensity of skeleton particle, the character arranging tight situation, contact area and cement are relevant with distribution situation.Loess is extremely loose when being formed, and by being slightly connected under friction and the effect of a small amount of moisture of particle, but after moisture evaporates gradually, volume shrinks to some extent, and colloid, salinity, Bound moisture concentrate on around relatively fine particle, forms certain cementing connection.Through repeatedly moistening dry run repeatedly, salt accumulation increases, the ageing of part colloid, therefore strengthens cementing gradually and forms form of structure loosely.Loose powder is cohered in seasonal short-term rainfall, and long-term arid climate makes water in soil divide continuous evaporation, so a small amount of moisture just concentrates on the contact point place of coarse dust together with the salinity be dissolved in wherein, soluble salts concentrating and precipitating and be formed as cement gradually.Along with the minimizing grogs of water content is close to each other, the attachment force of intergranular molecular attraction and Bound moisture and capillary water also increases gradually, these factors all enhance the ability of resisting slippage between grogs, prevent the deadweight Consolidation of the soil body, defining with coarse dust is the multiple-void structure of main body framework.When loess is by water-soaked, thicken between wedging particle in conjunction with moisture film, disappear so Bound moisture connects, salt is soluble in water, and frame strength is along with reduction, the soil body is at the gravity pressure of upper overburden layer or under gravity pressure and additonal pressure acting in conjunction, its structure is destroyed rapidly, and grogs is to macropore slippage, and intergranular pore reduces, thus cause a large amount of additional depressions, the intrinsic procedure of Loess Collapsibility phenomenon that Here it is.
Collapsible loess is a kind of soil of special nature, and under pressure, after sinking to stablizing, by water-soaked, soil structure is destroyed rapidly, and generation significantly adds.
Foundation ditch: in basic engineering position by the heatable adobe sleeping platform that substrate absolute altitude and basic plane size are excavated.According to geology hydrological data, in conjunction with on-the-spot nearby buildings situation, excavation plan should be determined, and performs water-proof drainage work before excavation.The not dark person of excavation by the way of putting side slope, can make Stability of Earth Slopes, and its gradient size is determined by relevant construction regulations.The comparatively dark and contiguous person that has building of excavation, available foundation pit walls supporting method, sprayed mortar wall protecting method, Large Foundation Pit even adopts diaphragm wall and the method such as colonnade formula bored pile is chain, protection outside soil layer collapse into; Nearby building is without influencer, available well point method dewatering, adopts and puts slope open cut; Natural cold air freezing process can be adopted to excavate etc. in cold district.Generally be divided into non-support and have supporting two class.
Non-support foundation ditch applicable elements:
1, foundation is not dark, and the construction period is shorter, does not affect the safety of adjacent structure when digging foundation ditch;
2, groundwater table is lower than substrate, or infiltration capacity is little, does not affect hole wall stability.
There is supporting foundation pit applicable elements:
1, foundation pit walls soil property is unstable, and has underground water mitigation;
2, slope open excavation amount is put excessive, uneconomical;
3, limit by construction plant or adjacent structure, can not adopt and put slope excavation.
Pattern foundation pit supporting structure: for ensureing the safety of Underground Construction and foundation ditch surrounding enviroment, to the gear that foundation pit side-wall and surrounding enviroment adopt.
Foundation Pit mainly contains: 1. campshed supporting, stake support, piled anchor, campshed cantilever; 2. diaphragm wall supporting; 3. EFFECT OF CEMENT STABILIZED SOIL RETAINING WALL; 4. steel sheet pile: the supporting of Section-steel Piles lagging, steel sheet pile supporting; 5. soil nail wall (combined bolting and shotcrete); 6. against making arch wall; 7. undisturbed soil puts slope; 8. internal support of foundation pit; 9. inverse make arch wall 10., wall adds support system; 11. simple horizontal support, 12. steel concrete campsheds etc.
Most foundation pit collapse causes primarily of two reasons, and one is that supporting is not enough, and two is impeded drainages, so will deal with problems, must solve supporting intensity and drainage problem simultaneously.Due to the restriction of construction plant, within the scope of limited place, how to solve supporting intensity problem and draining seem of equal importance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of loess foundation pit supporting method for the deficiencies in the prior art.
Technical scheme of the present invention is as follows:
A kind of loess foundation pit supporting method, need at foundation ditch the limit wall (1) of supporting squeezes into draining tractive pipe (2) with certain angle of inclination beta=5-10 °, Bian Bi (1) length outward stayed by draining tractive pipe (2) is 20-30cm; By the connecting hole (31) of the midpoint of sole bar reinforcement (3), be fixedly connected with on the top of pull bar (5) with draining tractive pipe (2), sole bar reinforcement (3) two ends are contacted with a safe edge wall (1) by gripper shoe (4).
Described loess foundation pit supporting method, the density of draining tractive pipe (2) on the wall of limit is determined according to the size of sole bar reinforcement (3), and between the upper and lower apart from being 2-4m, level interval is 4 m.
Described loess foundation pit supporting method, the rigid element that pull bar (5) is diameter 1-2cm, adjustable screw (51) is had in the middle of pull bar (5), the length of compensation linkage (5), be adjusted to sole bar reinforcement (3) to be formed with draining tractive pipe (2) and be firmly connected, and firmly supported by gripper shoe (4) and a safe edge wall (1).
Described loess foundation pit supporting method, draining tractive pipe (2) is round steel pipe tube wall being uniformly distributed permeable circular hole (22), permeable circular hole (22) diameter (1) cm, round steel pipe length direction is equidistantly distributed with many row'ss check tooth (21), it is a row that even circumferential along round steel pipe arranges (3) individual check tooth (21), be staggered between each row's check tooth (21), round steel pipe length 5-10m, check tooth (21) is 3cm along the height of round steel pipe radial direction, along the long 10-20cm of round steel pipe length direction; Round steel pipe one end is the domatic of angle [alpha]=30 °.
Compared with prior art, tool of the present invention has the following advantages:
(1) one sets of plan solves draining and support issues simultaneously.
(2) without the need to supporting bottom foundation ditch, construction in later period place occupation problem is solved.
(3) without the need to large-scale construction equipment, without the need to long working.
(4) suspension device can repeatedly use, and processing is simple.
Accompanying drawing explanation
Fig. 1 is loess foundation pit supporting construction schematic diagram of the present invention;
Fig. 2 is draining tractive tubular structure schematic diagram; 2-1 is front view, and 2-2 is lateral plan;
Fig. 3 is sole bar reinforcement and supporting plate structure schematic diagram;
Fig. 4 is Tiebar structure schematic diagram.
1 foundation ditch limit wall, 2 draining tractive pipes, 21 check teeth, 22 permeable circular holes, 3 sole bar reinforcements, 31 connecting holes, 4 gripper shoes, 5 pull bars, 51 adjustable screw.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
With reference to figure 1, need at foundation ditch the limit wall 1 of supporting squeezes into draining tractive pipe 2 with certain angle of inclination beta=5-10 °, the length that draining tractive pipe 2 is stayed outside limit wall 1 is 20-30cm, easy to operate during connection.The density of draining tractive pipe 2 on the wall of limit is determined according to the size of sole bar reinforcement 3, and between the upper and lower apart from being 2-4 m, level interval is 4 m.By the connecting hole 31 of the midpoint of sole bar reinforcement 3, be fixedly connected with on the top of pull bar 5 with draining tractive pipe 2, sole bar reinforcement 3 two ends are contacted with a safe edge wall 1 by gripper shoe 4.With reference to figure 4, pull bar 5 is the rigid element of diameter 1-2cm, has adjustable screw 51, the length of compensation linkage 5, be adjusted to sole bar reinforcement 3 and form firm connection with draining tractive pipe 2 in the middle of pull bar 5, and is firmly supported by gripper shoe 4 and a safe edge wall 1.
With reference to figure 2, draining tractive pipe 2 is round steel pipes tube wall being uniformly distributed permeable circular hole 22, permeable circular hole 22 diameter 1cm, round steel pipe length direction is equidistantly distributed with many row's check teeth 21, and it is a row that the even circumferential along round steel pipe arranges 3 check teeth 21, is staggered between each row's check tooth 21, round steel pipe length depends on the needs, general 5-10m, check tooth 21 is 3cm along the height of round steel pipe radial direction, along the long 10-20cm of round steel pipe length direction; Round steel pipe one end is the domatic of angle [alpha]=30 °.
With reference to figure 3, sole bar reinforcement 3 is a bow-shaped part, and two ends connect gripper shoe 4, sole bar reinforcement 3 span L, radian R, 0.25L≤R≤0.5L, and arrange connecting hole 31 in the middle of sole bar reinforcement 3, its diameter is 1.2cm.
Loess embankment is a kind of special continent rickle in the Quaternary Period, under the effect of upper overburden layer selfweight stress, or under selfweight stress and subsidiary stress acting in conjunction, remarkable additional deformation is there is because of the structural deterioration of soil after soaking, belong to collapsible soil, it is distributed widely in China northeast, northwest, Central China and some areas, East China.
Along with the quickening of this Region urbanization's process, increasing urban architecture, when excavation of foundation pit, due to limited with the distance of adjacent building, makes slope excavation more and more rise steeply; And along with the continuous increase of depth of building, foundation depth is also increasing, traditional supporting method has been difficult to the needs adapting to engineering.The present invention is exactly for this situation, and in limited place, in line with quick, economy, effectively principle, solve supporting and the drainage problem of deep foundation ditch in loess, the loess pattern foundation pit supporting structure for this area provides a kind of new method simultaneously.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (2)
1. a loess foundation pit supporting method, it is characterized in that, need at foundation ditch the limit wall (1) of supporting squeezes into draining tractive pipe (2) with certain angle of inclination beta=5-10 °, Bian Bi (1) length outward stayed by draining tractive pipe (2) is 20-30cm; By the connecting hole (31) of the midpoint of sole bar reinforcement (3), be fixedly connected with on the top of pull bar (5) with draining tractive pipe (2), sole bar reinforcement (3) two ends are contacted with a safe edge wall (1) by gripper shoe (4); The rigid element that pull bar (5) is diameter 1-2cm, adjustable screw (51) is had in the middle of pull bar (5), the length of compensation linkage (5), be adjusted to sole bar reinforcement (3) to be formed with draining tractive pipe (2) and be firmly connected, and firmly supported by gripper shoe (4) and a safe edge wall (1); Draining tractive pipe (2) is round steel pipe tube wall being uniformly distributed permeable circular hole (22), permeable circular hole (22) diameter 1cm, round steel pipe length direction is equidistantly distributed with many row'ss check tooth (21), it is a row that even circumferential along round steel pipe arranges 3 check teeth (21), be staggered between each row's check tooth (21), round steel pipe length 5-10m, check tooth (21) is 3cm along the height of round steel pipe radial direction, along the long 10-20cm of round steel pipe length direction; Round steel pipe one end is the domatic of angle [alpha]=30 °.
2. loess foundation pit supporting method according to claim 1, is characterized in that, the density of draining tractive pipe (2) on the wall of limit is determined according to the size of sole bar reinforcement (3), and between the upper and lower apart from being 2-4m, level interval is 4m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379484.6A CN102943480B (en) | 2012-10-09 | 2012-10-09 | Loess foundation pit supporting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379484.6A CN102943480B (en) | 2012-10-09 | 2012-10-09 | Loess foundation pit supporting method |
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| Publication Number | Publication Date |
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| CN102943480A CN102943480A (en) | 2013-02-27 |
| CN102943480B true CN102943480B (en) | 2015-06-03 |
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| CN201210379484.6A Expired - Fee Related CN102943480B (en) | 2012-10-09 | 2012-10-09 | Loess foundation pit supporting method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295608A (en) * | 2019-07-16 | 2019-10-01 | 西安建筑科技大学 | A kind of hot dehumidification supporting construction of loess foundation pit and its construction method |
| CN114263183B (en) * | 2020-09-16 | 2023-04-07 | 深圳市能亿建设工程有限公司 | Foundation pit supporting structure |
| CN112281857A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Deep foundation pit excavation construction method |
| CN114164838B (en) * | 2021-12-08 | 2023-05-23 | 浙大宁波理工学院 | Supporting device for foundation pit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62242017A (en) * | 1986-04-14 | 1987-10-22 | Nakano Bosai Gijutsu Kenkyusho:Kk | Method for constructing landslide-or-the-like proofing with filter system collecting and drain pipe |
| JPH1150457A (en) * | 1997-08-05 | 1999-02-23 | Kumagai Gumi Co Ltd | Earth retaining construction used for earth anchor |
| DE10032692A1 (en) * | 2000-07-05 | 2002-01-17 | Zueblin Ag | Method for anchoring of excavation walls uses drainage anchors with tension elements to secure walls and drain ground water from behind walls, to reduce water pressure on walls |
| KR100547036B1 (en) * | 2005-09-15 | 2006-01-31 | 주식회사 우정엔지니어링건축사사무소 | Vegetative water pipe for stability of a slope |
| CN201102549Y (en) * | 2006-12-19 | 2008-08-20 | 西安轨道交通装备有限责任公司 | Compaction connecting mechanism with center frame tank truck saddle and sleeper beam |
| CN102155016A (en) * | 2011-05-10 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Drainage anchor rod, side slope protection engineering repairing and reinforcing structure and construction method |
-
2012
- 2012-10-09 CN CN201210379484.6A patent/CN102943480B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62242017A (en) * | 1986-04-14 | 1987-10-22 | Nakano Bosai Gijutsu Kenkyusho:Kk | Method for constructing landslide-or-the-like proofing with filter system collecting and drain pipe |
| JPH1150457A (en) * | 1997-08-05 | 1999-02-23 | Kumagai Gumi Co Ltd | Earth retaining construction used for earth anchor |
| DE10032692A1 (en) * | 2000-07-05 | 2002-01-17 | Zueblin Ag | Method for anchoring of excavation walls uses drainage anchors with tension elements to secure walls and drain ground water from behind walls, to reduce water pressure on walls |
| KR100547036B1 (en) * | 2005-09-15 | 2006-01-31 | 주식회사 우정엔지니어링건축사사무소 | Vegetative water pipe for stability of a slope |
| CN201102549Y (en) * | 2006-12-19 | 2008-08-20 | 西安轨道交通装备有限责任公司 | Compaction connecting mechanism with center frame tank truck saddle and sleeper beam |
| CN102155016A (en) * | 2011-05-10 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Drainage anchor rod, side slope protection engineering repairing and reinforcing structure and construction method |
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| CN102943480A (en) | 2013-02-27 |
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