CN203960880U - Campshed and water-seal pile system of deep foundation pit support - Google Patents
Campshed and water-seal pile system of deep foundation pit support Download PDFInfo
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- CN203960880U CN203960880U CN201420403643.6U CN201420403643U CN203960880U CN 203960880 U CN203960880 U CN 203960880U CN 201420403643 U CN201420403643 U CN 201420403643U CN 203960880 U CN203960880 U CN 203960880U
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Abstract
A kind of campshed and water-seal pile system of deep foundation pit support, comprise spaced campshed, be arranged on the stake apical cap beam on campshed stake top, and be arranged on the water-seal pile between adjacent two campsheds, described campshed is steel concrete soldier pile, described stake apical cap beam is steel concrete Guan Liang, described water-seal pile is plain concrete pile, and plain concrete pile by between a side of foundation ditch and adjacent two campsheds also injection have pea gravel concreten retaining wall, described steel concrete soldier pile, plain concrete pile and pea gravel concreten retaining wall also reinforce the connection by the earthwork in steel waist rail and prestress anchorage cable and foundation ditch outside, steel waist rail is by upper strata steel waist rail, middle level steel waist rail and lower floor's steel waist rail composition, prestress anchorage cable is by upper strata prestress anchorage cable, middle level prestress anchorage cable and lower floor's prestress anchorage cable composition.The utility model utilizes campshed and prestress anchorage cable effectively to limit foundation pit deformation, utilizes water-seal pile sealing, thereby has ensured the safety of excavation of foundation pit and the safety of surrounding building, ensures that cost is relatively cheap simultaneously.
Description
Technical field
The utility model relates to a kind of foundation pit supporting construction.
Background technology
The geology characteristic of Lanzhou is in the boulder bed in stratum, to contain abundant underground water, and under boulder bed, is deeply to reach the waterproof sand layers (Weathered Sand rock stratum) of tens meters, and be substantially positioned at-10.00m of crack between boulder bed and waterproof sand layers left and right.In above-mentioned geological conditions, when the more than 15m deep big foundation pit of construction, will certainly pass through boulder bed, and foundation base is dropped in waterproof sand layers.
The deep big foundation pit of constructing more than 15m in above-mentioned geological conditions, except pattern foundation pit supporting structure, the crevice water between boulder bed and waterproof sand layers becomes the difficult point of deep foundation pit support.The above-mentioned geological condition of foundation, existing two kinds of foundation ditch technical schemes: (1) construction of diaphragm wall scheme; (2) Composition Soil Nailing Walls.
(1) construction of diaphragm wall scheme.Diaphragm wall both can be used as the supporting and protection structure of foundation ditch, had played again sealing effect, and safety factor is higher, but construction costs higher (pattern foundation pit supporting structure cost is crossed hundred million yuan), and the duration is longer.Especially construction of diaphragm wall needs large-scale professional construction machinery and professional, and large-scale professional construction machinery and professional are not difficult to find, if locality and surrounding area are without this construction machinery and personnel, certainly will assemble professional construction machinery and personnel from open coastal city, construction cost is high especially.
(2) Composition Soil Nailing Walls.This scheme is both economical, cost is low, but composite soil nailing wall is not obvious to the effect of restriction foundation pit deformation, be only suitable for the deep foundation ditch in 12m left and right in the excavation of foundation pit degree of depth, not obvious to deep big foundation pit restriction foundation pit deformation effect more than 15m, and the structural safety to the built building of periphery has considerable influence, and danger coefficient is high.
Utility model content
The purpose of this utility model is to provide a kind of campshed and water-seal pile system of deep foundation pit support, solve in the deep big foundation pit under the foundation condition with crevice water between pervious layer and impervious layer and more than 15m, the technical problem of carrying out pattern foundation pit supporting structure of more cheap safety how.
For achieving the above object, the utility model adopts following technical scheme: a kind of campshed and water-seal pile system of deep foundation pit support, be arranged in the foundation ditch that the degree of depth is greater than 15 meters, and the earthwork structure in this foundation ditch outside is followed successively by miscellaneous fill layer, boulder bed and waterproof sand layers from top to bottom, it is characterized in that: this campshed and water-seal pile system of deep foundation pit support comprise spaced campshed, be arranged on the stake apical cap beam on campshed stake top, and be arranged on the water-seal pile between adjacent two campsheds.
Described campshed is steel concrete soldier pile, described stake apical cap beam is steel concrete Guan Liang, described water-seal pile is plain concrete pile, the lower end of plain concrete pile is inserted in side under the hole of foundation ditch, and plain concrete pile by between a side of foundation ditch and adjacent two campsheds also injection have pea gravel concreten retaining wall.
Described steel concrete soldier pile, plain concrete pile and pea gravel concreten retaining wall also reinforce the connection by the earthwork in steel waist rail and prestress anchorage cable and foundation ditch outside, described steel waist rail is made up of upper strata steel waist rail, middle level steel waist rail and lower floor's steel waist rail, and described prestress anchorage cable is made up of upper strata prestress anchorage cable, middle level prestress anchorage cable and lower floor's prestress anchorage cable.
Described upper strata steel waist rail is arranged on the boulder bed position of foundation ditch, and one end of upper strata prestress anchorage cable is connected with upper strata steel waist rail, and the other end of upper strata prestress anchorage cable passes after pea gravel concreten retaining wall and plain concrete pile, is anchored in boulder bed.
Described middle level steel waist rail is arranged on the boulder bed position of foundation ditch, one end of middle level prestress anchorage cable is connected with middle level steel waist rail, and the other end of middle level prestress anchorage cable passes after pea gravel concreten retaining wall and plain concrete pile, passes boulder bed again, is finally anchored in waterproof sand layers.
Described lower floor steel waist rail is arranged on the waterproof sand layers position of foundation ditch, and one end of lower floor's prestress anchorage cable is connected with lower floor steel waist rail, the other end of lower floor's prestress anchorage cable through pea gravel concreten retaining wall and plain concrete pile after, be anchored in waterproof sand layers.
Preferably, described steel waist rail is by two back-to-back being formed by connecting of channel-section steel.
Preferably, the anchoring section of described middle level prestress anchorage cable is in waterproof sand layers completely.
Preferably, described prestress anchorage cable becomes the angle of 15 ° with horizontal plane.
Compared with prior art the utlity model has following characteristics and beneficial effect:
The utility model adopts the constructure scheme of campshed prestress anchorage cable+water-seal pile sealing, utilize campshed and prestress anchorage cable effectively to limit foundation pit deformation on the one hand, utilize on the other hand water-seal pile sealing, stop the adverse effect of underground water to Foundation Pit wall, thereby ensure the safety of excavation of foundation pit and the safety of surrounding building, ensure that cost is relatively cheap simultaneously.
The utility model has been set upper, middle and lower three road steel waist rail and prestress anchorage cables, and determine their position, this structure can guarantee to have under the foundation condition of crevice water between pervious layer and impervious layer to greatest extent, the more than 15m deep big foundation pit of excavation and and the safety of surrounding building thereof.
Campshed construction machinery, water-seal pile construction machinery and construction prestressed cable mechanical ratio that the utility model relates to are more common, quantity is more, personnel's abundance, construction technology maturation, both can effectively ensure that engineering implemented (construction safety coefficient is high) smoothly, ensure that again construction cost is also moderate, can become the reference frame that other areas solve the crevice water problem between pervious layer and impervious layer.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described in more detail.
Fig. 1 is plan structure schematic diagram of the present utility model.
Fig. 2 is facade structures schematic diagram of the present utility model.
Fig. 3 is the structural representation of prestress anchorage cable.
Reference numeral: 1-steel concrete soldier pile, 2-plain concrete pile, 3-pea gravel concreten retaining wall, 4-steel concrete Guan Liang, 5-upper strata steel waist rail, 6-upper strata prestress anchorage cable, the anchor head of 7-upper strata prestress anchorage cable, 8-middle level steel waist rail, 9-middle level prestress anchorage cable, the anchor head of 10-middle level prestress anchorage cable, 11-lower floor steel waist rail, 12-lower floor prestress anchorage cable, the anchor head of 13-lower floor prestress anchorage cable, 14-miscellaneous fill layer, 15-boulder bed, the waterproof sand layers of 16-.
Detailed description of the invention
Embodiment is referring to shown in Fig. 1-3, and this campshed and water-seal pile system of deep foundation pit support be arranged in the foundation ditch that the degree of depth is greater than 15 meters, and the earthwork structure in this foundation ditch outside are followed successively by miscellaneous fill layer 14, boulder bed 15 and waterproof sand layers 16 from top to bottom.
This campshed and water-seal pile system of deep foundation pit support comprise spaced campshed, are arranged on the stake apical cap beam on campshed stake top, and are arranged on the water-seal pile between adjacent two campsheds.
Described campshed is steel concrete soldier pile 1, described stake apical cap beam is steel concrete hat beam 4, described water-seal pile is plain concrete pile 2, the lower end of plain concrete pile 2 is inserted in side under the hole of foundation ditch, and plain concrete pile 2 has pea gravel concreten retaining wall 3(reinforcement waterproof effect by also spraying between a side of foundation ditch and adjacent two campsheds).
Described steel concrete soldier pile 1, plain concrete pile 2 and pea gravel concreten retaining wall 3 also reinforce the connection with the earthwork in foundation ditch outside by steel waist rail and prestress anchorage cable (comprising prestress anchorage cable).
In the present embodiment, steel waist rail is by two back-to-back being formed by connecting of channel-section steel, and prestress anchorage cable becomes the angle of 15 ° with horizontal plane.
Described steel waist rail is made up of upper strata steel waist rail 5, middle level steel waist rail 8 and lower floor's steel waist rail 11, and described prestress anchorage cable is made up of upper strata prestress anchorage cable 6, middle level prestress anchorage cable 9 and lower floor's prestress anchorage cable 12.
Described upper strata steel waist rail 5 is arranged on boulder bed 15 positions of foundation ditch, and one end of upper strata prestress anchorage cable 6 is connected with upper strata steel waist rail 5, and the other end of upper strata prestress anchorage cable passes after pea gravel concreten retaining wall 3 and plain concrete pile 2, is anchored in boulder bed 15.
Described middle level steel waist rail 8 is arranged on boulder bed 15 positions of foundation ditch, one end of middle level prestress anchorage cable 9 is connected with middle level steel waist rail 8, and the other end of middle level prestress anchorage cable 9 passes after pea gravel concreten retaining wall 3 and plain concrete pile 2, passes boulder bed 15 again, is finally anchored in waterproof sand layers 16.In the present embodiment, the anchoring section of middle level prestress anchorage cable 9 is in waterproof sand layers 16 completely.
Described lower floor steel waist rail 11 is arranged on waterproof sand layers 16 positions of foundation ditch, one end of lower floor's prestress anchorage cable 12 is connected with lower floor steel waist rail 11, the other end of lower floor's prestress anchorage cable 12 through pea gravel concreten retaining wall 3 and plain concrete pile 2 after, be anchored in waterproof sand layers 16.
Taking certain experimental project as example, 133707 square metres of this project overall floorages, wherein: superstructure is by (25 layers, high 99.55 meters of northern high buildings, 126.40 meters, roof shape top) and southern high building (27 layers, high 99.55 meters, roof shape top 126.40 meters) and two high buildings, 5 layers, middle part building and 7 layers, southern side building, four parts compositions, function comprises business, food and drink, office and hotel type office, and overall floorage is 96152 square metres on the ground; Totally three layers of overall floorage of under ground portion is 37555 square metres.
This project foundation depth is 19.50m, 13668 square metres of foundation ditch areas.Geology characteristic is in stratum, in boulder bed, to contain abundant underground water, and under boulder bed, is deeply to reach the waterproof sand layers of tens meters.Boulder bed and be substantially positioned at-10.00m of fluid-tight sand layers left and right.
This project adopts the constructure scheme of the utility model+tube well dewatering.Utilize the utility model effectively to limit foundation pit deformation on the one hand, utilize on the other hand tube well dewatering, water-seal pile sealing, stop the adverse effect of underground water to Foundation Pit wall, thereby ensure the safety of excavation of foundation pit and the safety of surrounding building.And above-mentioned the constructure scheme campshed, the water-seal pile construction machinery that relate to, construction prestressed cable machinery, tube well dewatering machinery quantity are more, personnel's abundance, and construction technology maturation, can effectively ensure that engineering implements smoothly, cost is also moderate.
This project adopts the constructure scheme of the utility model+tube well dewatering, and for engineering construction of the same type from now on provides example, the construction experience of obtaining in engineering, also for the Design of Deep Foundation Pit Support of engineering of the same type from now on provides reference and foundation.
In this project, brick wall retaining structure is set on campshed, to ensure the scope of application in place.The stake footpath 1000mm of campshed, strength grade of concrete C30, protective layer thickness 50mm, pile spacing 1.8m, vertical muscle adopts HRB400 grade reinforcing steel, and stirrup adopts HRB335 grade reinforcing steel, and the building-in depth of campshed is by calculative determination.The strength grade of concrete C30 of the steel concrete Guan Liang on campshed stake top, upper strata steel waist rail 5, middle level steel waist rail 8 and the lower floor's steel waist rail 11 that pile body is established is channel steel cross beam.
In this project, prestress anchorage cable is prestress anchorage cable pore-forming, aperture 150mm, and 15 °, inclination angle, is arranged between adjacent two steel concrete soldier piles spacing 900mm.Prestress anchorage cable material selection prestressing force 1 × 7 steel strand, 1860MPa, prestress anchorage cable locking adopts ground tackle and billet.Prestress anchorage cable grouting adopts M20 class g cement slurry, and early strong, expansion Admixture of admixture.
In this project, linked network and injection pea gravel concreten retaining wall 3, Foundation Pit wall steel mesh reinforcement is two-way Ф 6.5@250X250mm, reinforcing rib 2 Ф 14mm, level is to elongated layout.The pea gravel concreten dado thickness 80mm spraying, the strength grade C20 of the pea gravel concreten of injection.
Precipitation, the sealing design of this project are as follows.
1, pipe well well-points dewatering.Dewatering well is laid spacing 14.0m, considers underground water upstream face encryption spacing 12.0m, lays 40 dewatering wells at foundation ditch periphery, and well depth is controlled by going deep into 3.5m in Weathered Sand rock stratum, determines that dewatering well well depth is 15.0m, drilling diameter 800mm, well casing diameter 350mm.Pipe well well point forms stable precipitation funnel, cuts off as far as possible the supply of peripheral water source to foundation ditch, makes foundation ditch form closed state.
2, pipe well pore-forming adopts impact holing, and well casing is necessary well-flushing after installing, and keeps filter screen unobstructed; Filter length is got 7.5m, and three joint well casing length, require its porosity more than 30%, bag net adopts wire lath or nylon wire, must pad rib between net and tube wall, be highly not less than 6mm, the each one deck of boulder bed chimney filter outsourcing 20,30 mesh filter screen, sand layers chimney filter outsourcing 60 mesh filter screens are two-layer; The outer filtrate thickness of well casing is not less than 200mm, and the good gravel of degree of rounding for filtrate is filled to 2.0～2.5m left and right well head from shaft bottom, and seal with clay on top.Require sealing at the bottom of well casing pipe.
3, take out and fall method: can be according to the concrete actual conditions in scene, for accelerating precipitation, can adopt and draw water in advance, can adopt discontinuity to draw water depending on the dewatering effect later stage.
4, bright row's precipitation in hole.After excavation of foundation pit, according to hole internal water accumulation situation, at the bottom of Foundation Pit surrounding that 500mm(is set is long) × 500mm(is wide) × 1000mm(is dark) big or small sump, spacing 30m, adopts brick, M10 cement sand plaster.Meanwhile, along surrounding at the bottom of foundation ditch slope, 300mm(is set wide) × 300mm(is dark) big or small open drain, brick, M10 cement sand plaster, ditch grade gets 0.5%; In ditch, the clean pebble shape of filling 30～50mm becomes french drain, and foundation ditch infiltration is introduced in sump, is evacuated to grit chamber discharges by sump.
5, water-seal pile sealing.Between adjacent two steel concrete soldier piles 1, a water-seal pile is set, thereby can reaches the double-deck object of hole wall sealing and inter-pile soil protection, plain concrete pile strength grade C20.Consider after excavation of foundation pit on the one hand, more than not exposing the end, hole at the bottom of water-seal pile stake, prevent that on the other hand a small amount of infiltration from affecting disintegration sandstone, so water-seal pile is considered structure requirement, need to insert hole end 2000mm.
Described steel concrete soldier pile 1 is as follows with plain concrete pile 2 pore-formings.
1, rotary drilling rig becomes evenly rule of hole shape, the strict mud balance of controlling in construction, and the quality of guarantee mud off, prevents collapse hole and reaming.Particularly in boulder bed, creep into, also will guarantee the height of water level of mud face, guaranteed water level pressure, stops boulder bed collapse hole.Once there is collapse hole or reaming in soldier pile, increase the local pile body size of soldier pile, water-seal pile just can not be compacted with soldier pile embedded squeezing, and just there is local weak spot in sealing.
2, steel concrete soldier pile 1 and plain concrete pile 2 pore-formings, often observe borehole perpendicularity deviation, occurs that deviation adjusts in time, ensures that soldier pile and the mutual embedded squeezing of water-seal pile are compacted.
3, plain concrete pile 2 pore-formings, cut a hole clearly the physical location after pile crown according to soldier pile, adjust.
Described prestress anchorage cable that main points are set is as follows.
1, upper strata prestress anchorage cable 6 all passes through boulder bed, must guarantee the dewatering effect in this paragraph, in hole, will be dried.Otherwise moistening fine sand can affect piercing into of prestress wire, shorten freedom length, and more can affect the grouting quality of anchoring section, finally affect stretch-draw quality.
2, in prestress anchorage cable pore forming process, if enter waterproof sand layers 16(fine sand layer, flour sand layer), when particularly anchoring section is in waterproof sand layers 16, must lengthen hole depth, anchoring section will, completely in waterproof sand layers 16, ensure slip casting length and the quality of anchoring section.
3, the prestress anchorage cable slip casting in boulder bed, must ensure that the slurry denseness flowing out in aperture is consistent with injection slurry denseness time, can stop slip casting.In boulder bed, cobble hole is larger, and slurry appears more along hole, and in general boulder bed, grouting amount will reach 3 to 5 times of design flow, even more.
Claims (4)
1. a campshed and water-seal pile system of deep foundation pit support, be arranged in the foundation ditch that the degree of depth is greater than 15 meters, and the earthwork structure in this foundation ditch outside is followed successively by miscellaneous fill layer (14), boulder bed (15) and waterproof sand layers (16) from top to bottom, it is characterized in that: this campshed and water-seal pile system of deep foundation pit support comprise spaced campshed, be arranged on the stake apical cap beam on campshed stake top, and be arranged on the water-seal pile between adjacent two campsheds;
Described campshed is steel concrete soldier pile (1), described stake apical cap beam is steel concrete Guan Liang (4), described water-seal pile is plain concrete pile (2), the lower end of plain concrete pile (2) is inserted in side under the hole of foundation ditch, and plain concrete pile (2) by between a side of foundation ditch and adjacent two campsheds also injection have pea gravel concreten retaining wall (3);
Described steel concrete soldier pile (1), plain concrete pile (2) and pea gravel concreten retaining wall (3) also reinforce the connection by the earthwork in steel waist rail and prestress anchorage cable and foundation ditch outside, described steel waist rail is made up of upper strata steel waist rail (5), middle level steel waist rail (8) and lower floor's steel waist rail (11), and described prestress anchorage cable is made up of upper strata prestress anchorage cable (6), middle level prestress anchorage cable (9) and lower floor's prestress anchorage cable (12);
Described upper strata steel waist rail (5) is arranged on boulder bed (15) position of foundation ditch, one end of upper strata prestress anchorage cable is connected with upper strata steel waist rail (5), and the other end of upper strata prestress anchorage cable passes after pea gravel concreten retaining wall (3) and plain concrete pile (2), is anchored in boulder bed (15);
Described middle level steel waist rail (8) is arranged on boulder bed (15) position of foundation ditch, one end of middle level prestress anchorage cable (9) is connected with middle level steel waist rail (8), and the other end of middle level prestress anchorage cable (9) passes after pea gravel concreten retaining wall (3) and plain concrete pile (2), passes boulder bed (15) again, is finally anchored in waterproof sand layers (16);
Described lower floor's steel waist rail (11) is arranged on waterproof sand layers (16) position of foundation ditch, one end of lower floor's prestress anchorage cable (12) is connected with lower floor's steel waist rail (11), and the other end of lower floor's prestress anchorage cable (12) passes after pea gravel concreten retaining wall (3) and plain concrete pile (2), is anchored in waterproof sand layers (16).
2. campshed according to claim 1 and water-seal pile system of deep foundation pit support, is characterized in that: described steel waist rail is by two back-to-back being formed by connecting of channel-section steel.
3. campshed according to claim 1 and water-seal pile system of deep foundation pit support, is characterized in that: the anchoring section of described middle level prestress anchorage cable (9) is in waterproof sand layers (16) completely.
4. campshed according to claim 1 and water-seal pile system of deep foundation pit support, is characterized in that: described prestress anchorage cable becomes the angle of 15 ° with horizontal plane.
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| CN201420403643.6U CN203960880U (en) | 2014-07-22 | 2014-07-22 | Campshed and water-seal pile system of deep foundation pit support |
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| CN201420403643.6U CN203960880U (en) | 2014-07-22 | 2014-07-22 | Campshed and water-seal pile system of deep foundation pit support |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532853A (en) * | 2014-12-30 | 2015-04-22 | 武汉中力岩土工程有限公司 | Deep foundation pit supporting method and system characterized by steel reinforced cement-soil piles, bolts easy to detach and automatic monitoring and early warning |
| CN106013171A (en) * | 2016-06-30 | 2016-10-12 | 大连理工大学 | Semi-rigid and semi-flexible support structure and method for deep foundation pit side wall |
| CN106592514A (en) * | 2016-12-09 | 2017-04-26 | 济南市市政工程有限公司 | Construction method of old city riverway piling wall integrated vertical type retaining wall |
| CN109162282A (en) * | 2018-09-05 | 2019-01-08 | 江苏兴厦建设工程集团有限公司 | A kind of deep basal pit maintenance construction |
| CN109853556A (en) * | 2019-01-22 | 2019-06-07 | 华北有色工程勘察院有限公司 | The ultra-deep that can bear explosion influence adopts hole supporting and retaining system and its construction method |
-
2014
- 2014-07-22 CN CN201420403643.6U patent/CN203960880U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532853A (en) * | 2014-12-30 | 2015-04-22 | 武汉中力岩土工程有限公司 | Deep foundation pit supporting method and system characterized by steel reinforced cement-soil piles, bolts easy to detach and automatic monitoring and early warning |
| CN104532853B (en) * | 2014-12-30 | 2017-03-22 | 武汉中力岩土工程有限公司 | Deep foundation pit supporting method and system characterized by steel reinforced cement-soil piles, bolts easy to detach and automatic monitoring and early warning |
| CN106013171A (en) * | 2016-06-30 | 2016-10-12 | 大连理工大学 | Semi-rigid and semi-flexible support structure and method for deep foundation pit side wall |
| CN106013171B (en) * | 2016-06-30 | 2019-02-01 | 大连理工大学 | A kind of semi-rigid supporting construction semi-flexible and method of deep-foundation side wall |
| CN106592514A (en) * | 2016-12-09 | 2017-04-26 | 济南市市政工程有限公司 | Construction method of old city riverway piling wall integrated vertical type retaining wall |
| CN109162282A (en) * | 2018-09-05 | 2019-01-08 | 江苏兴厦建设工程集团有限公司 | A kind of deep basal pit maintenance construction |
| CN109853556A (en) * | 2019-01-22 | 2019-06-07 | 华北有色工程勘察院有限公司 | The ultra-deep that can bear explosion influence adopts hole supporting and retaining system and its construction method |
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