CN105484288A - Bottom plate structure with rock foundation, of underground structure - Google Patents
Bottom plate structure with rock foundation, of underground structure Download PDFInfo
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- CN105484288A CN105484288A CN201510323006.7A CN201510323006A CN105484288A CN 105484288 A CN105484288 A CN 105484288A CN 201510323006 A CN201510323006 A CN 201510323006A CN 105484288 A CN105484288 A CN 105484288A
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Abstract
The invention belongs to the technical field of underground structure engineering, and particularly relates to a bottom plate structure with a rock foundation, of an underground structure. The bottom plate structure with the rock foundation is characterized by comprising columns, side walls, a bottom plate, bottom plate longitudinal beams, a concrete cushion layer, the rock foundation and soft cushion layers, wherein the side walls and the bottom plate longitudinal beams are arranged above the bottom plate; the columns are arranged on the top surfaces of the bottom plate longitudinal beams; the concrete cushion layer is arranged at the bottom of the bottom plate; the rock foundation is arranged at the bottom of the concrete cushion layer; and the soft cushion layers are arranged at the bottom of the concrete cushion layer. According to the invention, stresses on the bottom plate and the sidewalls of the underground structure, the thicknesses of the bottom plate and the sidewalls, and reinforcements of the bottom plate and the sidewalls, can be reduced, thus anti-floating pile construction can be omitted, and raw materials can be saved; and good vertical bearing capacity and water isolation performance of the rock foundation are adequately utilized, thus the stresses on the bottom plate and the bottoms of the sidewalls can be reduced, concrete and steel bars can be saved, and engineering costs can be decreased.
Description
Technical field
The invention belongs to construction of underground structure technical field, particularly relate to a kind of rock foundation underground structure bottom plate structure.
Background technology
At present, structure of the subway presses box structure design, considers earthing soil pressure, water pressure, surface car load and dead load.Structure of the subway computation model is be bearing in plane frame structure symmetrical on elastic foundation, simulates resistance of soil under frame construction base plate with soil spring.Structural calculation adopts two kinds of operating modes: full water level operating mode and zero level operating mode.For domestic modal 11m wide single-column an island platform station standard section, top plate earth-covering thickness 3m, the key dimension of structure of the subway is: the thick 800mm of top board, the thick 900mm of base plate, side wall 700mm, middle plate 400mm, center pillar 800mm × 1000mm, and post is apart from 8.4m.Full water level operating mode (high water level), base plate spaning middle section moment of flexure is 633kN-m, and base plate is 1046kN-m across end section moment of flexure, and top board mid span moment is 460kN-m, and top board is 502kN-m across end section moment of flexure.Zero level operating mode (not considering hydraulic pressure), base plate spaning middle section moment of flexure is 552kN-m, and base plate is 731kN-m across end section moment of flexure, and top board mid span moment is 683kN-m, and top board is 849kN-m across end section moment of flexure.According to stress balance principle, side wall tip section moment of flexure is identical across end section moment of flexure with top board, and side wall bottom section turn moment is identical across end section moment of flexure with base plate.From the result of calculation of full water level operating mode and zero level operating mode, can know: full water level operating mode base plate is across large 143% of end section bending moment ratio zero level operating mode.So, if the infiltration under structure base slab can be got rid of, calculate and do not consider effect of water pressure, significantly can reduce base plate across end and the moment of flexure of side wall bottom, concrete and reinforcing bar can be saved, reduction construction costs.
Structure of the subway computation model is single, does not consider the impact of geological conditions under structure base slab.Under the city underground structure base slabs such as Changsha, Qingdao, Dalian, Chongqing, ground is usually rock foundation, and rock foundation has higher bearing capacity, and rock foundation seeps water hardly, has good water isolating.Such as, station, Chang Zhu Tan inter-city passenger rail Kaifu Temple, structure base slab is seated on the slate of weak weathering or middle weathering, and the saturated compressive strength 9.7-13MPa of slate, does not almost seep water bottom station pit; For another example, Qingdao region No. 3 line part station structure of the subway base plates are seated on weak weathered granite, compressive strength of rock 20MPa.If only consider earthing pressure, dead load, floor load action (namely not considering the effect of side wall soil pressure and water-proof function requirement), strip foundation or single footing can be adopted completely, and not needing to adopt raft foundation, structural cost can significantly reduce.
Summary of the invention
The present invention is directed to above-mentioned technical problem, provide a kind of rock foundation underground structure bottom plate structure reducing construction costs.
The technical solution adopted in the present invention is:
A kind of rock foundation underground structure bottom plate structure, it is characterized in that: comprise post, side wall, base plate, underframe longitudinal member, concrete cushion, rock foundation, cushion course, described side wall, underframe longitudinal member are arranged at the top of described base plate, described post is arranged at the end face of described underframe longitudinal member, concrete cushion is provided with bottom described base plate, be rock foundation bottom described concrete cushion, the bottom of described concrete cushion is provided with cushion course.
Described cushion course is arranged at bottom the concrete cushion at the span centre position between described side wall and underframe longitudinal member or between underframe longitudinal member and underframe longitudinal member.
Described cushion course is soft material.
Described cushion course is layer of sand or polystyrene board.
Described cushion course is layer of sand, is equipped with coiled material between described layer of sand end face and concrete cushion.
Gutter is provided with in described layer of sand.
Described cushion course adopts polystyrene board, and described polystyrene board has weeper drain.
Gutter is provided with in described weeper drain.
Infiltration bottom base plate, through the pool wall that catchments of inside configuration, is introduced in collecting-tank by gutter by described gutter.
Beneficial effect of the present invention is:
1, the present invention can reduce underground structure bottom plate and side wall is stressed, reduces base plate and side wall thicknesses, reduces base plate and side wall arrangement of reinforcement, can save and perform anti-floating pile, save material;
2, make full use of the good vertical bearing capacity of rock foundation and water isolating, can reduce bottom base plate and side wall stressed, save concrete and reinforcing bar, reduce construction costs;
3, improve underground structure water resistance, improve the durability of structure;
4, the present invention is particularly useful for the basement of subway station, underground parking and highrise building;
5, weeper drain and gutter conventional method perform;
6, cushion course can be layer of sand, polystyrene board or other soft material, compares with rock foundation, and the compression amount of touching of this soft material is lower.
Accompanying drawing explanation
Fig. 1 is structure base slab cushion course arrangement schematic diagram provided by the invention;
Fig. 2 is cross-sectional schematic when cushion course is layer of sand in the present invention;
Fig. 3 is cross-sectional schematic when cushion course is polystyrene board in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
In figure, 1-post, 2-side wall, 3-base plate, 4-concrete cushion, 5-rock foundation, 6-cushion course, 7-weeper drain, 8-gutter, 9-coiled material, 10-underframe longitudinal member.
As Figure 1-3, a kind of rock foundation underground structure bottom plate structure, comprise post 1, side wall 2, base plate 3, underframe longitudinal member 10, concrete cushion 4, rock foundation 5, cushion course 6, side wall 2, underframe longitudinal member 10 are arranged at the top of base plate 3, post 1 is arranged at the end face of underframe longitudinal member 10, being provided with concrete cushion 4 bottom base plate 3, is rock foundation 5 bottom concrete cushion 4, and the bottom of concrete cushion 4 is provided with cushion course 6.
Cushion course 6 is arranged at bottom the concrete cushion 4 at the span centre position between side wall 2 and underframe longitudinal member 10 or between underframe longitudinal member 10 and underframe longitudinal member 10.
Cushion course 6 is soft material.
Cushion course 6 is layer of sand or polystyrene board.
Cushion course 6 is layer of sand, is equipped with coiled material 9 between layer of sand end face and concrete cushion 4.
Gutter 8 is provided with in layer of sand.
Cushion course 6 adopts polystyrene board, and polystyrene board has weeper drain 7.
Gutter 8 is provided with in weeper drain 7.
Infiltration bottom base plate 3, through the pool wall that catchments of inside configuration, is introduced in collecting-tank by gutter 8 by gutter 8.
Embodiment 1
As shown in Figure 1-2, station, Chang Zhu Tan inter-city passenger rail Kaifu Temple is station, 3 layers, underground, and thickness of earth covering is about 3.5m, and station structure is 3 across box structure, longitudinal post apart from 12m, structure base slab 3 buried depth 31m, structure width 25m.The physical dimension designed routinely: top plate thickness 0.80m, B1 and underground two floor plate thickness are 0.4m, structure side wall 2 thickness 1m, base plate 3 thickness 1.2m, and the cross section of post 1 is 0.8m × 1.2m.Place geology is: artificial earth fill, silty clay, garden gravel soil, severely-weathered slate, middle wind slap and weak wind slap, structure base slab 3 is positioned at weak wind slap, the weak wind slap thickness of base plate more than 3 is greater than 10m, the saturated compressive strength 9.7-13MPa of weak wind slap, middle wind slap and weak wind slap seep water hardly.Due to work progress security needs, outside structure side wall 2, perform the diaphragm wall that 1.2m is thick.Underground structure bottom plate structure of the present invention is adopted to be: base plate 3 thickness 0.80m, performs concrete cushion 4 bottom base plate 3, the thick 150mm of concrete cushion 4; Cushion course 6 is provided with bottom span centre concrete cushion 4 between side wall 2 and underframe longitudinal member 10, between underframe longitudinal member 10 and underframe longitudinal member 10, the wide 2.5m of end bay cushion course 6, cushion course 6 edge far from exterior wall edge 1.3m, cushion course 6 edge far from underframe longitudinal member 10 center 2.5m, the elongated setting of longitudinal cushion course 6; In across cushion course 6 transverse width 5.4m, horizontal cushion course 6 edge far from underframe longitudinal member 10 center 2.5m, the elongated setting of longitudinal cushion course 6.Cushion course 6 adopts layer of sand, the thick 0.3m of layer of sand, a layer coiled material 9 is laid between layer of sand and concrete cushion 4, be provided with gutter 8 in layer of sand, gutter 8 adopts the plastic pipe such as pvc pipe, PE pipe, gutter 8 diameter 40mm-50mm, internal diameter 35mm-45mm, plastic pipe is interval with aperture, hole diameter 6mm-10mm, and plastic pipe external application geotextiles wraps up 2 layers or 3 layers.
In base plate 3 across effective span L2=10.4m.Design base plate 3 structure routinely, zero level operating mode (water level is at base plate less than 3), suppose to act on base plate soil pressure for being uniformly distributed, soil pressure p=136kN/m2, suppose to calculate base plate across end moment M 1 and base plate mid span moment M2, M1=136 × 10.4 × 10.4/12=1225.8kN-m by clamped plate; M2=136 × 10.4 × 10.4/24=612.9kN-m.By base plate 3 structure of the present invention, in across base plate cushion course 6 transverse width 5.4m, the wide 2.5m of end bay base plate cushion course 6, average soil pressure p1=136 × 25/ (the 25-5.4-2.5-2.5)=232.9kN/m2 of base plate 3, mid span moment M4=p1 × 2.53/ (3 × L2)=116.6kN-m, across end moment M 3=2.5 × 232.9 × 1.25-116.6=611.2kN-m.M3/M1=0.5，M4/M2=0.19。So underground structure bottom plate 3 moment of flexure of the present invention significantly reduces.
Embodiment 2
As shown in Figure 1,3, station, Chang Zhu Tan inter-city passenger rail Kaifu Temple is station, 3 layers, underground, and thickness of earth covering is about 3.5m, and station structure is 3 across box structure, longitudinal post apart from 12m, structure base slab 3 buried depth 31m, structure width 25m.The physical dimension designed routinely: top plate thickness 0.80m, structure side wall 2 thickness 1m, base plate 3 thickness 1.2m, the cross section of post 1 is 0.8m × 1.2m.Place geology is: artificial earth fill, silty clay, garden gravel soil, severely-weathered slate, middle wind slap and weak wind slap, structure base slab 3 is positioned at weak wind slap, the weak wind slap thickness of base plate more than 3 is greater than 10m, the saturated compressive strength 9.7-13MPa of weak wind slap, middle wind slap and weak wind slap seep water hardly.Due to work progress security needs, outside structure side wall 2, perform the diaphragm wall that 1.2m is thick.Underground structure bottom plate 3 structure of the present invention is adopted to be: base plate 3 thickness 0.80m, performs concrete cushion 4 bottom base plate 3, the thick 150mm of concrete cushion 4; Cushion course 6 is provided with bottom span centre concrete cushion 4 between side wall 2 and underframe longitudinal member 10, between underframe longitudinal member 10 and underframe longitudinal member 10, the wide 2.5m of end bay cushion course 6, cushion course 6 edge far from exterior wall edge 1.3m, cushion course 6 edge far from underframe longitudinal member 10 center 2.5m, the elongated setting of longitudinal cushion course 6; In across cushion course 6 transverse width 5.4m, horizontal cushion course 6 edge far from underframe longitudinal member 10 center 2.5m, the elongated setting of longitudinal cushion course 6.Cushion course 6 adopts polystyrene board, polystyrene thickness of slab 8cm, is provided with weeper drain 7 bottom polystyrene board, french drain size: the wide 0.5m in top, the wide 0.3m in bottom, high 0.3m, weeper drain 7 is provided with gutter 8, gutter 8 adopts the plastic pipe such as pvc pipe, PE pipe, gutter 8 diameter 60mm-100mm, internal diameter 50mm-90mm, plastic pipe is interval with aperture, hole diameter 8mm-10mm, plastic pipe external application geotextiles wraps up 2 layers or 3 layers, and gutter 8 external space coarse sand in french drain is filled.
Above 1 embodiment of the present invention has been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (9)
1. a rock foundation underground structure bottom plate structure, it is characterized in that: comprise post, side wall, base plate, underframe longitudinal member, concrete cushion, rock foundation, cushion course, described side wall, underframe longitudinal member are arranged at the top of described base plate, described post is arranged at the end face of described underframe longitudinal member, concrete cushion is provided with bottom described base plate, be rock foundation bottom described concrete cushion, the bottom of described concrete cushion is provided with cushion course.
2. a kind of rock foundation underground structure bottom plate structure according to claim 1, is characterized in that: described cushion course is arranged at bottom the concrete cushion at the span centre position between described side wall and underframe longitudinal member or between underframe longitudinal member and underframe longitudinal member.
3. a kind of rock foundation underground structure bottom plate structure according to claim 1, is characterized in that: described cushion course is soft material.
4. a kind of rock foundation underground structure bottom plate structure according to claim 3, is characterized in that: described cushion course is layer of sand or polystyrene board.
5. a kind of rock foundation underground structure bottom plate structure according to claim 3, is characterized in that: described cushion course is layer of sand, is equipped with coiled material between described layer of sand end face and concrete cushion.
6. a kind of rock foundation underground structure bottom plate structure according to claim 5, is characterized in that: be provided with gutter in described layer of sand.
7. a kind of rock foundation underground structure bottom plate structure according to claim 3, is characterized in that: described cushion course adopts polystyrene board, and described polystyrene board has weeper drain.
8. a kind of rock foundation underground structure bottom plate structure according to claim 7, is characterized in that: be provided with gutter in described weeper drain.
9. a kind of rock foundation underground structure bottom plate structure according to claim 6 or 8, is characterized in that: infiltration bottom base plate, through the pool wall that catchments of inside configuration, is introduced in collecting-tank by gutter by described gutter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510323006.7A CN105484288A (en) | 2015-06-12 | 2015-06-12 | Bottom plate structure with rock foundation, of underground structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510323006.7A CN105484288A (en) | 2015-06-12 | 2015-06-12 | Bottom plate structure with rock foundation, of underground structure |
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| CN105484288A true CN105484288A (en) | 2016-04-13 |
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| CN201510323006.7A Pending CN105484288A (en) | 2015-06-12 | 2015-06-12 | Bottom plate structure with rock foundation, of underground structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108589A (en) * | 2021-11-26 | 2022-03-01 | 上海市建工设计研究总院有限公司 | Rock foundation underground structure bottom plate structure and building method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007315067A (en) * | 2006-05-26 | 2007-12-06 | Nitto Kako Kk | Improved ground |
| CN103147464A (en) * | 2013-04-01 | 2013-06-12 | 四川省建筑科学研究院 | Pressure-releasing structure of basement anti-floating plate and construction method thereof |
| CN204780995U (en) * | 2015-06-12 | 2015-11-18 | 中铁隧道勘测设计院有限公司 | Rock foundation underground structure bottom plate structure |
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2015
- 2015-06-12 CN CN201510323006.7A patent/CN105484288A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007315067A (en) * | 2006-05-26 | 2007-12-06 | Nitto Kako Kk | Improved ground |
| CN103147464A (en) * | 2013-04-01 | 2013-06-12 | 四川省建筑科学研究院 | Pressure-releasing structure of basement anti-floating plate and construction method thereof |
| CN204780995U (en) * | 2015-06-12 | 2015-11-18 | 中铁隧道勘测设计院有限公司 | Rock foundation underground structure bottom plate structure |
Non-Patent Citations (1)
| Title |
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| 孙加明: "土岩组合地层盖挖逆作地铁基坑的变形及竖向受力特性研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑（月刊）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108589A (en) * | 2021-11-26 | 2022-03-01 | 上海市建工设计研究总院有限公司 | Rock foundation underground structure bottom plate structure and building method thereof |
| CN114108589B (en) * | 2021-11-26 | 2024-02-23 | 上海市建工设计研究总院有限公司 | Bottom plate structure of rock foundation underground structure and construction method thereof |
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Application publication date: 20160413 |
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