CN201395794Y - Foundation pit with concealed columns and soil nailing - Google Patents
Foundation pit with concealed columns and soil nailing Download PDFInfo
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- CN201395794Y CN201395794Y CN2008202232272U CN200820223227U CN201395794Y CN 201395794 Y CN201395794 Y CN 201395794Y CN 2008202232272 U CN2008202232272 U CN 2008202232272U CN 200820223227 U CN200820223227 U CN 200820223227U CN 201395794 Y CN201395794 Y CN 201395794Y
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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Abstract
具有暗柱和土钉支护的基坑，涉及一种软质土层的基坑，目的是解决在市区的软土地区开挖基坑存在的基坑边坡顶位移过大、土钉墙面板支撑力弱的问题，包括在地基上挖出的、由边坡围成的坑体，边坡体的纵向设置有暗柱，边坡的横向打入有土钉；所述暗柱为钻孔压浆桩，该钻孔压浆桩为钢筋笼内投入碎石再压入水泥浆构成；钢筋笼以螺纹钢筋为主筋，沿长度方向配置的加强筋，主筋外设置螺旋箍筋；暗柱的顶部设置有冠梁；所述土钉的杆体采用钢管，并分为三段；前端三分之一和中部三分之一部分分别固定连接有螺纹钢作为倒刺，且前端三分之一部分钻有注浆眼；倒刺为螺旋布置。本实用新型适用于在市区内的软土地层开挖所形成基坑的支护。
The foundation pit with concealed pillars and soil nailing is related to a foundation pit in soft soil layer. The problem of weak support of the wall panel includes the pit body dug out on the foundation and surrounded by the side slope. The side slope body is provided with concealed columns in the longitudinal direction, and soil nails are driven into the side slope in the transverse direction; the hidden columns are Drilled grouting pile, the drilled grouting pile is formed by putting gravel into the steel cage and then pressing cement slurry; the steel cage is made of threaded steel as the main reinforcement, and the reinforcement is arranged along the length direction, and the spiral stirrup is arranged outside the main reinforcement; the hidden column The top of the soil nail is provided with a crown beam; the rod body of the soil nail is made of steel pipe and is divided into three sections; the front third and middle third are fixedly connected with rebar as barbs, and the front third Some of them are drilled with grouting holes; the barbs are arranged in a spiral. The utility model is suitable for supporting and supporting foundation pits formed by excavating soft soil layers in urban areas.
Description
Technical field
The utility model belongs to technical field of building construction, particularly a kind of foundation ditch of soft soil layer.
Background technology
When building highrise building, need the foundation ditch of excavation, but for soft soil layer, the excavation slope soil strength of excavation is not enough, need handle to form the compound soil body the excavation slope body as basis or basement.
Soil nailing is to constitute by boring, joint bar, slip casting in the natural soil body, also can directly squeeze into angle steel, bar reinforcement formation soil nailing.
Side slope or the body of wall of having squeezed into soil nailing then become the soil nailing wall, and it can be reinforced on the spot and combine with spraying the concrete panel, form a similar gravity barricade and come soil pressure after the resistance wall with this, thereby keep stablizing of excavation face.
At present, implement the foundation ditch of plate brad supporting structure, only be applied to suitable soil layer, here so-called " suitably soil layer " mainly is by the particularity decision of soil nailing technology: the mode that requires the employing small stair progressively to dig down when construct as slip casting type soil nailing, during the soil nailing body of rod, pneumatically placed concrete surface construction, side slope is in unsupported " cantilever " state requires soil strength can keep himself uprightly stable; The adhesion stress of soil nailing and surrounding soil can not be too low; The soil body and sprayed mortar should have certain adhesion strength; The soil nailing pore-forming wants easy etc. in the soil layer.The soil layer that satisfies above-mentioned restrictive condition in the engineering is that certain close-burning miscellaneous fill, cohesive soil, silt, loess and weak glued sand etc. are arranged.
The tension pull out force of soil nailing is too low, and is more obvious when especially using in soft layer, and this has just limited its scope of application in soft soil layer.
There is following problems in the plate brad supporting technology when soft clay area is used: the adhesion stress of soil nailing and surrounding soil is on the low side, if will meet design requirement, soil nailing length, density must increase.This is unallowed and in the urban district of prosperity; Be difficult to behind the excavation of foundation pit support oneself or, easily cave in because infiltration is serious; Soil layer and pneumatically placed concrete surface layer adhesion strength are low, are difficult to construction.
The utility model content
The purpose of this utility model be solve that the excavation slope top displacement that the soft clay area excavation pit in the urban district exists is excessive, the problem a little less than the soil nailing shingle nail support force, the support technology that provides a kind of adding to have sleeper and soil nailing to combine, strengthening the globality of foundation pit supporting construction, with the excavation of the soft soil layer foundation ditch that is applicable to the urban district.
The purpose of this utility model is achieved through the following technical solutions:
Foundation ditch with sleeper and plate brad supporting is included in the hole body that digs out on the ground, surrounded by the side slope body, the side slope body be vertically arranged with sleeper, the side slope body laterally squeezed into soil nailing.
Described sleeper is a drilled pressure filling pile, and this drilled pressure filling pile is to drop into rubble in the reinforcing cage to be pressed into the cement paste formation again, and its underpart enters the bottom 2.0～4.0m of hole body, and pile spacing is 1.2～2.0m, and row of piles is apart from being 1.0～1.5m, and the stake footpath is 350～450mm; Reinforcing cage comprises that 8 indented barss are main muscle, and every 2m disposes reinforcing rib one on the length direction, and main muscle is provided with spiral stirrup outward, and helix pitch is 20cm; The top of sleeper is provided with Guan Liang.
The body of rod of described soil nailing adopts steel pipe, and is divided into three sections; Front end 1/3rd and middle part three/part are fixedly connected with screw-thread steel respectively as hangnail, and front end three/part is drilled with the slip casting eye; Hangnail is a screw arrangement.
Described side slope surface is provided with the steel concrete surface layer, and this surface layer comprises steel mesh reinforcement and pea gravel concreten; Soil nailing and steel concrete surface layer connection are provided with the horizontal reinforcing rib of waling and elongated layout.
Described Guan Liang ties up weldering with the soil nailing end on top and is connected.
The crossing angle of described soil nailing and horizontal plane is 10～15 °.
The composite support structure that the utility model adopts above-mentioned sleeper to combine with soil nailing has been expanded the range of application of soil nailing structure greatly, especially in the application of soft clay area; Plate brad supporting belongs to the mechanism of initiatively reinforcing, and can improve the undisturbed soil intensity of foundation ditch greatly, increases the rigidity of the compound soil body, has retrained the distortion of slope soil, has significantly improved the resistance to overturning of side slope; The effect of sleeper is the soil lateral that reduces in the construction stage excavation, supports sprayed mortar surface layer weight, improves the resistance to overturning of plate brad supporting system.
As seen, adopt the utility model of said structure, compared with prior art, can solve the problem a little less than, the soil nailing shingle nail support force excessive, be applicable to the supporting of the soft soil layer institute excavation pit in the urban district in the excavation slope top displacement that the soft clay area excavation pit in urban district exists.
Description of drawings
Fig. 1 is a side slope elevational schematic view of the present utility model;
Fig. 2 is the structural profile schematic diagram of sleeper and soil nailing in the utility model;
Fig. 3 is the arrangement of reinforcement schematic diagram of sleeper in the utility model;
Fig. 4 is a Q-Q cross section arrangement of reinforcement schematic diagram among Fig. 3;
Fig. 5 is the hat beam arrangement of reinforcement schematic diagram of sleeper in the utility model;
Fig. 6 is the connection diagram of Guan Liang and soil nailing in the utility model;
Fig. 7 is the drawing in side sectional elevation of soil nailing in the utility model;
Fig. 8 is the drawing in side sectional elevation of soil nailing and concrete pavement in the utility model;
Number in the figure: the 1st, sleeper, the 2nd, soil nailing, the 3rd, Guan Liang, 4 surface layers of sprayed mortar when putting slope section plate brad supporting, sprayed mortar surface layer during 5 vertical sections sleeper-soil nailing composite support, the 6th, concrete inserts section, the 7th, the angle of intersection of soil nailing and horizontal plane, the 8th, hangnail, the 9th, cement paste, the 10th, steel pipe, the 11st, steel mesh reinforcement, the 12nd, the horizontal reinforcing rib of anchor pole, the 13rd, anchor pole waling.
The specific embodiment
Below in conjunction with specific embodiments and the drawings the utility model is further described.
As shown in Figure 1, comprise the hole body that is surrounded by the side slope body at the foundation ditch of the soft clay area in urban district excavation, vertically the arranging of side slope is provided with sleeper 1, laterally arranges and squeezed into soil nailing 2, and the top of sleeper 1 is provided with hat beam 3.
As shown in Figure 2, the angle of intersection 7 of soil nailing 2 and horizontal plane is between 10～15 °, and sleeper 1 is that concrete inserts section 6 with the lower end of soil nailing 2 composite support structural panels; Side slope surface is provided with the sprayed mortar surface layer, and the pea gravel concreten that sprays match ratio and be C20 is as breast boards, and top is sprayed mortar surface layer 4 when putting slope section plate brad supporting, and thickness is 50mm; Sprayed mortar surface layer 5 when the bottom is a vertical section sleeper-soil nailing composite support, thickness is 80mm.The sprayed mortar surface layer all adopts pea gravel concreten, and intensity is C20, and cement is the 32.5R Composite portland cement.The reinforced concrete slab structure that above-mentioned two parts surface layer all is made up of sprayed mortar and steel mesh reinforcement.The surfacing steel bar net adopts reinforcing bar binding to form.
Sleeper is a drilled pressure filling pile, and this drilled pressure filling pile is to drop into rubble in the reinforcing cage to be pressed into the cement paste formation again, according to designing requirement, its underpart enters the bottom 2.0～4.0m of hole body, pile spacing is 1.2～2.0m, and row of piles is apart from being 1.0～1.5m, and the stake footpath is 350～450mm; Reinforcing cage comprises that 8 indented barss are main muscle, and every 2m disposes reinforcing rib one on the length direction, and main muscle is provided with spiral stirrup outward, and helix pitch is 20cm; The top of sleeper is provided with Guan Liang.
As shown in Figure 5, are furnished with 6 reinforcing bars in the hat beam 3.
As shown in Figure 6, hat beam 3 is tied up to weld with soil nailing 2 and is connected.
As Fig. 7, shown in Figure 8, the body of rod of soil nailing 1 adopts steel pipe 10, and is divided into three sections; Front end 1/3rd and middle part three/part are fixedly connected with screw-thread steel respectively as hangnail 8, and front end three/part is drilled with the slip casting eye; Hangnail 8 is a screw arrangement.
As shown in Figure 8, the steel pipe 10 of soil nailing 1 stretches into the horizontal reinforcing rib 12 of anchor pole that the interior end of steel concrete surface layer is fixedly connected with anchor pole waling 13 and elongated layout, and its fixedly connected mode can be welding.
The job practices of present embodiment and concrete parameter are as follows:
1, sleeper
(1) parameter: basic parameter was provided with as follows when drilled pressure filling pile was used for pattern foundation pit supporting structure: stake long according to each foundation ditch section cutting depth difference and difference, it determines that principle is that stake end enters 2.0～4.0m at the bottom of the foundation ditch, pile spacing is 1.2～2.0m, can arrange more and put, row of piles is apart from being 1.0～1.5m, and the design stake is 350～450mm directly; The pile body structure: pile body disposes 8 on Φ 16 indented barss symmetrically and evenly, and every 1m disposes φ 6.5 reinforcing ribs one as main muscle, and main muscle is provided with φ 6.5 spiral stirrups outward, and helix pitch is 20cm, and thickness of protection tier is 20mm; The stake top is provided with 350 (or 450) * 300mm contact and connects with Guan Liang, to guarantee the mass action of drilled pressure filling pile in pattern foundation pit supporting structure.
(2), the construction equipment of sleeper
The CK15-A rig; Mortar pump; Mortar mixer.
(3), the construction technology process of sleeper
The construction technology process of sleeper is as follows:
Discharge hole → draw hole → be lowered to sleeve pipe → put into reinforcing cage and Grouting Pipe → insert gravel → slip casting → excavation hat beam foundation trench, and colligation hat beam steel → build C15 concrete → drilled pressure filling pile maintenance → soil excavation
1) discharge hole:
According to Shop Drawing Design Document IT Application and each drilled pressure filling pile stake position of on-the-spot actual measuring.
2) draw the hole: perforate plan-position error is no more than ± 5cm.
3) reinforcing cage is made: because stake is longer, and reinforcing cage segmentation place welding quality particular importance, main muscle joint should stagger mutually, and guaranteeing that same cross section spigot number is no more than 50%, two joint spacing of main muscle sum should be greater than 50cm, and weldering elongation degree should satisfy code requirement;
4) pore-forming, be lowered to Grouting Pipe, fill out gravel: hole depth by project management department according to the base pit engineering plan and on-the-spotly actually determine.Adopt CK15-A rig pore-forming during construction, behind the pore-forming, put into reinforcing cage, be lowered to Grouting Pipe, insert 0～4cm cobble.
5) slip casing by pressure: injecting paste material adopts the neat slurry of 32.5R Composite portland cement preparation, slurry water gray scale 0.5: 1, grouting pressure is 1MPa～2MPa, extremely next pile is poured into after returning out underflow in the stake top, treat that slurries are after sinking a period of time, previous stake of pouring into is recharged, and this process should be carried out repeatedly, till no longer sinking to slurries.
6) the contact beam is made: the stake top is provided with 350 (or 450) * 300mm contact beam and connects, to guarantee the mass action of drilled pressure filling pile in pattern foundation pit supporting structure; After slip casing by pressure is finished, manually dig and make contact beam groove, and manually cut a top laitance, pile body and second layer anchor pole are welded to connect, will anchor into about pile body 10cm in the beam body, assembling reinforcement, thickness of concrete cover is 2.5cm, formwork is built the C20 concrete.
7) drilled pressure filling pile maintenance: drilled pressure filling pile pile body palpus maintenance 7 days, treat that its intensity reaches design strength 60% and carries out soil excavation with the top.
2, soil nailing
(1) parameter of soil nailing
Soil nailing is divided into soil nailing body and surface layer.
The soil nailing body: the used slurries of soil nailing slip casting are neat slurry, and the slurry water/binder ratio is 0.5: 1, and pressure is 1～2Mpa; Soil nailing length and soil nailing spacing can be adjusted in right amount according to the actual geological condition in scene.By designing requirement, rod body material adopts Φ 48 steel pipes, and the body of rod is divided into three sections, and front end 1/3 part welding 50mm@2000mm screw-thread steel is as hangnail, and brill slip casting eye, and middle part 1/3 part welding 50mm@2000mm screw-thread steel does not bore the slip casting eye as hangnail; Afterbody 1/3 does not weld screw-thread steel.Hangnail takes spiral way to arrange.The body of rod surperficial straight do not have the slight crack that influences body of rod quality, and the internal request of the body of rod is unimpeded.
Surface layer: the reinforced concrete slab structure pattern that surface layer adopts sprayed mortar and steel mesh reinforcement to form.Lay steel mesh reinforcement between the soil nailing body of rod, and on steel mesh reinforcement, press the main muscle of putting 2 vertical long 60cm of being as anchor pole waling 13, elongated horizontal bar is as horizontal reinforcing rib of anchor pole 12 and steel pipe 10 welding as the body of rod, thereafter the pea gravel concreten that sprays match ratio and be C20 is as breast boards, top put slope section plate brad supporting the time sprayed mortar surface thickness 50mm, sprayed mortar surface thickness 80mm during the vertical section sleeper of bottom-plate brad supporting.Sprayed mortar adopts pea gravel concreten, and intensity is C20, and cement is the 32.5R Composite portland cement.The surfacing steel bar net adopts φ 8@150 * 150～250 * 250 reinforcing bar bindings to form.Soil nailing end and reinforcing rib adopt and are welded to connect.
(2) construction equipment of soil nailing
QC-150 type Pneumatic immpacting roof-bolter; Pneumatic mortar machine; Air compressor machine; The sprayed mortar machine; Electric welding machine cutting machine etc.
(3) construction technology process of soil nailing
The soil nailing job practices: adopting QC-150 type Pneumatic immpacting roof-bolter is the welded tube of φ 48mm with diameter, impacts and squeezes in the stratum, forms soil nailing after the slip casting.
The soil nailing construction technology process is as follows:
1) construction survey
A. excavation line is measured: finished by civil engineering unit.
B. the soil nailing position is measured: marked with red paint by full-time survey crew along smooth sprayed mortar face, measure error must not surpass 5cm.
2) soil nailing construction
A. the body of rod is made: make according to the base pit engineering plan, and the body of rod is divided into three sections, front end 1/3 part welding 50mm@2000 screw-thread steel is as hangnail; And boring the slip casting eye, middle part 1/3 part welding 50mm@2000 screw-thread steel does not bore the slip casting eye as hangnail; Afterbody 1/3 does not weld hangnail, and hangnail takes spiral way to arrange.The selection of the body of rod requires the surface straight, does not have the slight crack that influences body of rod quality, and the internal request of the body of rod is unimpeded.
B. the body of rod is laid: the body of rod is laid and is adopted QC-150 type Pneumatic immpacting to squeeze in the stratum, forms soil nailing after the slip casting.
Squeeze into method.Require the soil nailing position in the construction in design attitude 5cm scope, it is 10～15 degree that soil nailing is put into soil body back rake angle.
3) welding
A. the welding between the body of rod: should guarantee during welding that bonding area adheres to specification, and guarantee that body of rod inside is unimpeded.
B. soil nailing and metal host muscle welding: the control weld strength, should avoid rosin joint and the not enough problem of bonding area in the welding emphatically.
4) construction of shotcrete
A. foundation pit walls should clean out loosened soil before the construction of shotcrete, for guaranteeing that panel closely is connected with mini pile, should clean out loosened soil in the mini pile position, exposes pile concrete, cheats wall simultaneously and keeps straight.
B. the artificial spice in concrete mix report carrying out scene that provide according to Nanchong City quality monitoring station of concrete batching, spice is even.
C. sprayed mortar thickness is 5～8cm, and 28 days planted agents after having sprayed are carried out in accordance with regulations maintenance.For guaranteeing sprayed mortar thickness, the foundation ditch work plane is provided with sprayed mortar thickness sign every 1m, can adopt small wooden or bar dowel, length is about about 15cm, and an end inserts in the wall earth of hole, and an end exposes the outer 8cm of hole wall, during construction of shotcrete, set sign is covered.For guaranteeing the sprayed mortar protective layer thickness, reinforced mesh should adopt reinforced mesh gravel pebbles or other fritter shape material cushion to rise about 3cm after laying and finishing.
5) mud jacking
A. the slurry water gray scale is 0.5, and mud jacking pressure is about 1.5MPa.
B. every soil nailing mud jacking amount is not less than 50kg (can determine optimum mud jacking amount according to actual conditions less than the bolt grouting amount scene of 6m to length).
C. slurries should stir, and with stirring with usefulness, need to use up before slurries reach initial set.
D. the soil nailing mortar depositing construction should be shared supporting at this soil nailing and partly sprays and carry out after coagulation construction is finished 1 day, and performs the mud jacking construction note.
6) shoveling forms foundation ditch
The shoveling time should avoid damaging completed dado structure during shoveling after mud jacking finishes 12 hours.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008202232272U CN201395794Y (en) | 2008-12-08 | 2008-12-08 | Foundation pit with concealed columns and soil nailing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008202232272U CN201395794Y (en) | 2008-12-08 | 2008-12-08 | Foundation pit with concealed columns and soil nailing |
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| Publication Number | Publication Date |
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| CN201395794Y true CN201395794Y (en) | 2010-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008202232272U Expired - Fee Related CN201395794Y (en) | 2008-12-08 | 2008-12-08 | Foundation pit with concealed columns and soil nailing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852016A (en) * | 2010-06-11 | 2010-10-06 | 中国二十二冶集团有限公司 | Construction method for mounting scaffolds by using underground wall body ultralong vertical ribs at one step |
| CN102277875A (en) * | 2011-05-09 | 2011-12-14 | 中铁二院工程集团有限责任公司 | Composite supporting structure between piles |
| CN102352630A (en) * | 2011-08-31 | 2012-02-15 | 中国新兴建设开发总公司 | Full-thread fiber resin rod body soil nailing wall and construction method thereof |
| CN103147446A (en) * | 2013-03-27 | 2013-06-12 | 成都兴蜀勘察基础工程公司 | Visible-beam and hidden-rib lattice anchor cable foundation pit supporting structure |
| CN104196036A (en) * | 2014-09-01 | 2014-12-10 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure and method based on old underground outdoor wall structure |
| CN107558477A (en) * | 2017-10-20 | 2018-01-09 | 甘肃中建市政工程勘察设计研究院 | The supporting construction and construction method that a kind of foundation ditch is combined with side slope |
| CN112411578A (en) * | 2020-11-04 | 2021-02-26 | 苏州市八都建筑有限公司 | Plain-fill retaining wall under soft soil foundation and construction method thereof |
-
2008
- 2008-12-08 CN CN2008202232272U patent/CN201395794Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852016A (en) * | 2010-06-11 | 2010-10-06 | 中国二十二冶集团有限公司 | Construction method for mounting scaffolds by using underground wall body ultralong vertical ribs at one step |
| CN101852016B (en) * | 2010-06-11 | 2011-12-14 | 中国二十二冶集团有限公司 | Construction method for mounting scaffolds by using underground wall body ultralong vertical ribs at one step |
| CN102277875A (en) * | 2011-05-09 | 2011-12-14 | 中铁二院工程集团有限责任公司 | Composite supporting structure between piles |
| CN102352630A (en) * | 2011-08-31 | 2012-02-15 | 中国新兴建设开发总公司 | Full-thread fiber resin rod body soil nailing wall and construction method thereof |
| CN103147446A (en) * | 2013-03-27 | 2013-06-12 | 成都兴蜀勘察基础工程公司 | Visible-beam and hidden-rib lattice anchor cable foundation pit supporting structure |
| CN104196036A (en) * | 2014-09-01 | 2014-12-10 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure and method based on old underground outdoor wall structure |
| CN104196036B (en) * | 2014-09-01 | 2016-04-13 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure and method based on old underground outdoor wall structure |
| CN107558477A (en) * | 2017-10-20 | 2018-01-09 | 甘肃中建市政工程勘察设计研究院 | The supporting construction and construction method that a kind of foundation ditch is combined with side slope |
| CN112411578A (en) * | 2020-11-04 | 2021-02-26 | 苏州市八都建筑有限公司 | Plain-fill retaining wall under soft soil foundation and construction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100203 Termination date: 20161208 |