CN102943480A - Loess foundation pit supporting method - Google Patents
Loess foundation pit supporting method Download PDFInfo
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- CN102943480A CN102943480A CN2012103794846A CN201210379484A CN102943480A CN 102943480 A CN102943480 A CN 102943480A CN 2012103794846 A CN2012103794846 A CN 2012103794846A CN 201210379484 A CN201210379484 A CN 201210379484A CN 102943480 A CN102943480 A CN 102943480A
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- foundation pit
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- steel pipe
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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, perhaps under selfweight stress and subsidiary stress acting in conjunction, the soil that remarkable additional deformation occurs because of the structural deterioration of the rear soil that soaks is called collapsible soil, belongs to special soils.Be distributed widely in many tools of loess settlement by soaking of China northeast, northwest, Central China and some areas, East China.
Loess class soil 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 by the constituent structure decision of loess itself.Contain 60 multi mineral in the loess, take detrital mineral as main, and contain the part clay mineral.Be mainly quartz, feldspar, carbonatite in the detrital mineral; The clay mineral overwhelming majority is hydromica, and a small amount of montmorillonite and kaolinite etc. are arranged.Lyotropic salt, middle dissolved salt and organic content are less.The structural system that consists of 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 is determining the stability of structural system.Collapsible loess generally all forms granular built on stilts some contact or half cementing form, and saturated yielding degree and the intensity of skeleton particle, the character of arranging tight situation, contact area and cement are relevant with distribution situation.Loess is extremely loose when forming, and by slightly connection under the effect of the friction of particle and the moisture of being connected, but after moisture evaporated gradually, volume shrank to some extent, colloid, salinity, concentrates on than around the fine grained in conjunction with water, forms certain cementing connection.Through repeatedly moistening dry run repeatedly, salt accumulation increases, and therefore the ageing of part colloid is strengthened cementing and form of structure that formation is looser gradually.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 is together with the contact point place that is dissolved in wherein salinity and just concentrates on coarse dust, soluble salts is concentrating and precipitating and form cement gradually.Along with the minimizing grogs of water content is close to each other, intergranular molecular attraction and be connected connection power with capillary water in conjunction with water and also increase gradually, these factors have all strengthened the ability of opposing slippage between the grogs, the deadweight Consolidation that has stoped the soil body has formed the multiple-void structure take coarse dust as main body framework.When loess is subjected to water-soaked, thicken between the wedging particle in conjunction with moisture film, so connect disappearance in conjunction with water, salt is soluble in water, 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 the macropore slippage, and intergranular pore reduces, thereby 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, under certain pressure, after sinking to stablizing, is subjected to water-soaked, and soil structure is destroyed rapidly, and generation significantly adds.
Foundation ditch: the heatable adobe sleeping platform that excavates by substrate absolute altitude and basic plane size in the basic engineering position.Should according to the geology hydrological data, in conjunction with on-the-spot nearby buildings situation, determine excavation plan, and perform water-proof drainage work before the excavation.The not dark person of excavation can make Stability of Earth Slopes with the way of putting side slope, and its gradient size is determined by relevant construction regulations.The dark and contiguous person that has the building of excavation, available foundation pit walls supporting method, sprayed mortar wall protecting method, Large Foundation Pit even adopt diaphragm wall and the method such as colonnade formula bored pile is chain, protection outside soil layer collapse into; Nearby build without the influencer, available well point method dewatering adopts and puts sloping open cut; Can adopt natural cold air freezing process excavation etc. at cold district.Generally be divided into non-support and supporting two classes are arranged.
Non-support foundation ditch applicable elements:
1, the basis is embedding 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, and perhaps infiltration capacity is little, does not affect hole wall stability.
The supporting foundation pit applicable elements is arranged:
1, the foundation pit walls soil property is unstable, and the impact of underground water is arranged;
2, it is excessive, uneconomical to put sloping open excavation amount;
3, limited by construction plant or adjacent structure, can not adopt and put the slope excavation.
Pattern foundation pit supporting structure: for guaranteeing the safety of Underground Construction and foundation ditch surrounding enviroment, to a gear of foundation pit side-wall and surrounding enviroment employing.
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 is put the slope; 8. foundation ditch inner support; 9. contrary make 10. of arch walls, wall adds support system; 11. simple horizontal supports, 12. steel concrete campsheds etc.
Most foundation pit collapses are mainly caused by two reasons, and the one, supporting is not enough, and the 2nd, impeded drainage so will deal with problems, must solve supporting intensity and drainage problem simultaneously.Because the restriction of construction plant, the problem and the draining that how to solve supporting intensity in limited place scope seem of equal importance.
Summary of the invention
Technical problem to be solved by this invention is to provide 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 needs the limit wall (1) of supporting upward to squeeze into draining tractive pipe (2) with certain angle of inclination beta=5-10 ° at foundation ditch, and it is 20-30cm that draining tractive pipe (2) is stayed the outer length of Bian Bi (1); The connecting hole (31) of the midpoint by sole bar reinforcement (3) is fixedly connected with the top of pull bar (5) with draining tractive pipe (2), and sole bar reinforcement (3) two ends contact 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 decided according to the size of sole bar reinforcement (3), and apart from being 2-4m, level interval is 4 m between the upper and lower.
Described loess foundation pit supporting method, pull bar (5) is the rigid element of diameter 1-2cm, pull bar (5) but in the middle of adjusting screw(rod) (51) arranged, the length of compensation linkage (5), be adjusted to sole bar reinforcement (3) and firmly be connected with draining tractive pipe (2) formation, and by gripper shoe (4) and firmly support of a safe edge wall (1).
Described loess foundation pit supporting method, draining tractive pipe (2) is the round steel pipe of the even permeable circular hole (22) that distributes on the tube wall, permeable circular hole (22) diameter (1) cm, be distributed with many row's check teeth (21) in round steel pipe length direction equal intervals, the individual check tooth of even circumferential setting (3) (21) along round steel pipe is a row, each is arranged between the check tooth (21) and is staggered, round steel pipe length 5-10m, check tooth (21) is 3cm along round steel pipe height radially, 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, the present invention has following advantage:
(1) one sets of plan solves draining and supporting problem simultaneously.
(2) need not to have solved construction in later period place occupation problem in foundation ditch bottom supporting.
(3) need not large-scale construction equipment, need not long working.
(4) suspension device can be repeatedly used, and processing is simple.
Description of drawings
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 that sole bar reinforcement is the supporting plate structure schematic diagram;
Fig. 4 is the 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, but 51 adjusting screw(rod)s.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
With reference to figure 1, need at foundation ditch on the limit wall 1 of supporting to squeeze into draining tractive pipe 2 with certain angle of inclination beta=5-10 °, it is 20-30cm that draining tractive pipe 2 is stayed limit wall 1 outer length, easy to operate during connection.The density of draining tractive pipe 2 on the wall of limit is decided according to the size of sole bar reinforcement 3, and apart from being 2-4 m, level interval is 4 m between the upper and lower.The connecting hole 31 of the midpoint by sole bar reinforcement 3 is fixedly connected with the top of pull bar 5 with draining tractive pipe 2, and sole bar reinforcement 3 two ends contact 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, but in the middle of the pull bar 5 adjusting screw(rod) 51 is arranged, and the length of compensation linkage 5 is adjusted to sole bar reinforcement 3 and firmly is connected with 2 formation of draining tractive pipe, and firmly supports by gripper shoe 4 and a safe edge wall 1.
With reference to figure 2, draining tractive pipe 2 is round steel pipes of the even permeable circular hole 22 that distributes on the tube wall, permeable circular hole 22 diameter 1cm, be distributed with many row's check teeth 21 in round steel pipe length direction equal intervals, along the even circumferential of round steel pipe 3 check teeth 21 being set is a row, and each is arranged between the check tooth 21 and is staggered, round steel pipe length depends on the needs, general 5-10m, check tooth 21 is 3cm along round steel pipe height radially, 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, and radian R, 0.25L≤R≤0.5L arranges connecting hole 31 in the middle of the sole bar reinforcement 3, and its diameter is 1.2cm.
Loess class soil is a kind of special continent rickle in the Quaternary Period, under the effect of upper overburden layer selfweight stress, perhaps under selfweight stress and subsidiary stress acting in conjunction, because remarkable additional deformation occurs in the structural deterioration of the rear soil that soaks, 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 is when excavation of foundation pit, owing to limited with the distance of adjacent building, so that slope excavation more and more rises steeply; And along with the continuous increase of depth of building, foundation depth is also increasing, and traditional supporting method has been difficult to adapt to the needs of engineering.The present invention is exactly for this situation, in limited place, in line with fast, economic, principle effectively, solve simultaneously supporting and the drainage problem of deep foundation ditch in the loess, for the loess pattern foundation pit supporting structure of this area provides a kind of new method.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (4)
1. a loess foundation pit supporting method is characterized in that, needs the limit wall (1) of supporting upward to squeeze into draining tractive pipe (2) with certain angle of inclination beta=5-10 ° at foundation ditch, and it is 20-30cm that draining tractive pipe (2) is stayed the outer length of Bian Bi (1); The connecting hole (31) of the midpoint by sole bar reinforcement (3) is fixedly connected with the top of pull bar (5) with draining tractive pipe (2), and sole bar reinforcement (3) two ends contact with a safe edge wall (1) by gripper shoe (4).
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 decided according to the size of sole bar reinforcement (3), and apart from being 2-4m, level interval is 4 m between the upper and lower.
3. loess foundation pit supporting method according to claim 1, it is characterized in that, pull bar (5) is the rigid element of diameter 1-2cm, pull bar (5) but in the middle of adjusting screw(rod) (51) arranged, the length of compensation linkage (5), be adjusted to sole bar reinforcement (3) and firmly be connected with draining tractive pipe (2) formation, and by gripper shoe (4) and firmly support of a safe edge wall (1).
4. loess foundation pit supporting method according to claim 1, it is characterized in that, draining tractive pipe (2) is the round steel pipe of the even permeable circular hole (22) that distributes on the tube wall, permeable circular hole (22) diameter (1) cm, be distributed with many row's check teeth (21) in round steel pipe length direction equal intervals, the individual check tooth of even circumferential setting (3) (21) along round steel pipe is a row, each is arranged between the check tooth (21) and is staggered, round steel pipe length 5-10m, check tooth (21) is 3cm along round steel pipe height radially, along the long 10-20cm of round steel pipe length direction; Round steel pipe one end is the domatic of angle [alpha]=30 °.
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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379484.6A CN102943480B (en) | 2012-10-09 | 2012-10-09 | Loess foundation pit supporting method |
Publications (2)
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| CN102943480A true CN102943480A (en) | 2013-02-27 |
| CN102943480B 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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Cited By (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 |
| CN112281857A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Deep foundation pit excavation construction method |
| CN114164838A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Strutting arrangement for foundation ditch |
| CN114263183A (en) * | 2020-09-16 | 2022-04-01 | 深圳市能亿建设工程有限公司 | Foundation pit supporting structure |
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 |
Cited By (5)
| 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 |
| CN114263183A (en) * | 2020-09-16 | 2022-04-01 | 深圳市能亿建设工程有限公司 | Foundation pit supporting structure |
| 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 |
| CN114164838A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Strutting arrangement for foundation ditch |
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| CN102943480B (en) | 2015-06-03 |
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