CN103074885A - Method for foundation settlement control - Google Patents
Method for foundation settlement control Download PDFInfo
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- CN103074885A CN103074885A CN2013100031043A CN201310003104A CN103074885A CN 103074885 A CN103074885 A CN 103074885A CN 2013100031043 A CN2013100031043 A CN 2013100031043A CN 201310003104 A CN201310003104 A CN 201310003104A CN 103074885 A CN103074885 A CN 103074885A
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- shaving board
- settlement
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Abstract
The invention discloses a method for foundation settlement control. The method is used for a foundation which is as follows: the height between a basement rock surface and a raft bottom surface is smaller than 0.5m, and foundation settlement needs to be moderately controlled. A first graded sand and stone layer, a settlement-control composite board layer, a second graded sand and stone layer, a concrete cushion layer and a raft are sequentially arranged on basement rock, wherein the first graded sand and stone layer and the second graded sand and stone layer are formed by graded sand and stone with the thickness of 80-120mm, the degree of compaction is 0.90-0.93, and the concrete cushion layer is a plain concrete layer with the thickness of 80-120mm. Large settlement difference of different parts of the foundation is adjusted, so the inner force of the foundation is greatly reduced and the structural safety is improved. Particularly, the settlement-control composite board layer is arranged at the part with small original settlement, so that the settlement of the foundations of different parts can be regulated to be similar, and the settlement difference is controlled not to be more than 5mm.
Description
Technical field
The present invention relates to a kind of subsidence control method, particularly relate to a kind of method of regulating the building foundation sedimentation, the method is particularly suitable for In Limestone Area place bad ground and exists the middle-shallow layer ground of the very large bedrock surface that rises and falls to increase settlement Control.
Background technology
Sedimentation is to need very problems of concern in the design of building structures.The differential settlement of building foundation different piece may make the internal force of basis and superstructure greatly increase, and is very unfavorable to the safety of structure.While is owing to the approximation of settlement calculation theory, and the inhomogeneities of project site geological conditions, causes reaching by computational methods merely regulating the very difficult realization of basic each several part relative settlement.If can reach the effect of regulating foundation settlement by a kind of construction measure, then can address this problem preferably.
The high building structure vertical load is large, often needs to adopt the base forms such as pile foundation or raft foundation just can satisfy the bearing capacity requirement.At the lime karst area, underground latent solution cavity scale is large, and scope is wide.Prior art adopts conventional drilled pile, Percussion Piles easily to cause a stake end Upper Plate of Karst Cave to subside, and if pass solution cavity in the formation of pile and then be difficult for processing.In this case, the employing rigid pile composite foundation can take full advantage of the bearing capacity of shallow-layer inter-pile soil, greatly improves the bearing capacity of footing ground, satisfies the high building structure demand, need not pass solution cavity simultaneously, has avoided above engineering problem.Yet the bedrock surface of In Limestone Area is often uneven, basement rock inclined plane even can reach 70 °～90 °.The such situation of normal appearance: place rock-mass face rises and falls very large, and a raft foundation part directly is bearing on the basement rock, and another part is bearing on the treated ground, causes easily the differential settlement of raft plate.The sedimentation of raft foundation that directly is bearing in basement rock is almost nil, and the sedimentation that is bearing in treated ground then can reach 20mm～30mm.Such differential settlement is very disadvantageous to structural safety and raft plate internal force.Therefore need to control the sedimentation of the raft foundation that directly is bearing in basement rock.
Summary of the invention
For overcoming the uneven settlement of foundation problem, the invention provides a kind of method for foundation settlement control, be used for directly being bearing in the settlement Control of the raft foundation of basement rock, realize that building settlement is even under the complex stratum condition.
The object of the invention is achieved through the following technical solutions:
A kind of method for foundation settlement control: for bedrock surface apart from raft plate bottom surface height less than the ground that 0.5m needs moderate control foundation settlement, set gradually the first grating sand stone layer, the compound flaggy of control sedimentation, the second grating sand stone layer, concrete cushion and raft plate at basement rock; Wherein, the first grating sand stone layer and the second grating sand stone layer are that the graded sand and stone of 80mm～120mm thickness forms, and degree of compaction is 0.90～0.93, and concrete cushion is the thick plain concrete layer of 80mm～120mm.
The compound flaggy of described control sedimentation is spliced to form by the composite plate of polylith control building settlement; The composite plate of control building settlement is square structure, comprises shaving board, EPS plate, lower shaving board and interface arrangement; Upper shaving board and lower shaving board lay respectively at the up and down both sides of EPS plate; The thickness of upper shaving board and lower shaving board is 4mm～6mm; The thickness of EPS plate is 20mm～40mm, being provided with at least for the interface arrangement that splices of the composite plate of control building settlement on one side, and this interface arrangement is tenon or tongue-and-groove; Tenon is the projection that the EPS plate exceeds shaving board and lower shaving board edge 15mm～25mm formation; Tongue-and-groove is the groove that the EPS plate is positioned at shaving board and lower shaving board edge 15mm～25mm formation.
For realizing that further the object of the invention, described the first grating sand stone layer and the second grating sand stone layer are preferably the thick graded sand and stone of 100mm and form.
Described concrete cushion is preferably the thick C15 plain concrete cushion layer of 100mm.
Described upper shaving board and lower shaving board are bonded in EPS plate upper and lower surface by glue.
The thickness of described upper shaving board and lower shaving board is preferably 5mm.
The height of projection of described tenon is 20mm, and the groove depth of tongue-and-groove is 20mm.
The Geological condition that the present invention especially is fit to is: bedrock surface tilts very large, and below the building raft foundation, a part of buried depth of bedrock is very shallow, and the raft plate directly supports thereon; Another part basement rock buries very dark, needs to adopt the methods such as raft plate, rigid pile composite foundation that natural ground is processed just and can satisfy requirement for bearing capacity.The present invention controls for the foundation settlement that the raft plate directly supports on the basement rock just.
With respect to prior art, the invention has the beneficial effects as follows: regulate the larger settlement difference of basic different piece, greatly reduce Internal force of foundation, improve safety of structure.For the bedrock surface part darker from the earth's surface, adopted suitable Ground Treatment Schemes, to satisfy highrise building to the requirement of bearing capacity of foundation soil.Generally, adopt rigid pile composite foundation (can be pile for prestressed pipe, long screw pile, CM stake etc.) more reasonable, this moment, the stake top contacted with base surface.Present common highrise building is 30～50 layers, and the load that acts on the ground is 350kPa～500kPa.The sedimentation of the treated composite foundation 20mm～30mm that is everlasting under this load level.Basement rock from the earth's surface ground of shallow portion very, the present invention reaches the purpose of balance different piece foundation settlement by set gradually the first grating sand stone layer, the compound flaggy of control sedimentation, the second grating sand stone layer, concrete cushion and raft plate at basement rock.The control sedimentation composite plate that the present invention adopts has following character: the initial compression modulus of deformation is 0.4MPa～0.5MPa, and along with load on it increases, vertical strain increases, and fine and close gradually, rigidity increases.Final under the load pressure action of 350kPa～500kPa, the decrement of this material is 20mm～30mm.After this decrement namely is fixed on this size substantially, can not pass in time the very large creep of appearance, namely the situation that decrement strengthens gradually can not occur under the load long term.This decrement is with close through the settling amount of processing section ground.Therefore, by control sedimentation composite plate is set at the very little position of script sedimentation, the sedimentation that can regulate the different piece basis is close, and differential settlement control is no more than 5mm.
Description of drawings
Fig. 1 is that the level that the present invention is used for the method for foundation settlement control arranges structural representation.
Fig. 2 is the structural representation that the present invention controls the composite plate of building settlement.
Fig. 3 is splicing and the scheme of installation of the present invention's composite plate of controlling building settlement.
Shown in the figure: the upper shaving board of 1-, 2-EPS plate, shaving board under the 3-, 4-tenon, 5-tongue-and-groove, 11-basement rock, 12-the first grating sand stone layer, the composite plate of 13-control building settlement, 14-the second grating sand stone layer, 15-plain concrete cushion layer, 16-raft plate.
The specific embodiment
The present invention will be further described below in conjunction with drawings and embodiments, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, a kind of method for foundation settlement control: for bedrock surface apart from raft plate bottom surface height less than the ground that 0.5m needs moderate control foundation settlement, set gradually the first grating sand stone layer 12, the compound flaggy 13 of control sedimentation, the second grating sand stone layer 14, concrete cushion 15 and raft plate 16 (the ground material on the basement rock 11 can directly be removed) at basement rock 11; Wherein, the first grating sand stone layer 12 and the second grating sand stone layer 14 are that the graded sand and stone of 80mm～120mm thickness forms, and degree of compaction is that the 0.90～0.93, first grating sand stone layer 12 and the second grating sand stone layer 14 are preferably the thick graded sand and stone formation of 100mm; Concrete cushion 15 is the thick plain concrete layer of 80mm～120mm, the preferred thick C15 plain concrete cushion layer of 100mm.Graded sand and stone be according to granularity with rubble, aggregate chips, medium coarse sand and water according to mass ratio 5: 3: 1.5: 0.5 mixes, and the particle diameter of its medium stone is 1-2cm; The particle diameter of aggregate chips is 2～10mm; Medium coarse sand be 3.7-2.3, fineness modulus is the scope of the simple constructional materials of sand.Fineness modulus is larger, and expression sand is thicker.
The compound flaggy 13 of control sedimentation is spliced to form by the composite plate of polylith control building settlement; As shown in Figure 2, the composite plate of control building settlement is square structure, comprises shaving board 1, EPS plate 2, lower shaving board 3 and interface arrangement; Upper shaving board 1 and lower shaving board 3 lay respectively at the up and down both sides of EPS plate 2; Preferred upper shaving board 1 and lower shaving board 3 are bonded in the upper and lower surface of EPS plate 2 by glue; The thickness of upper shaving board 1 and lower shaving board 3 is 4mm～6mm; The thickness of preferred upper shaving board 1 and lower shaving board 3 is 5mm; The thickness of EPS plate 2 is 30mm～50mm, Yi Bian the composite plate of control building settlement be provided with at least interface arrangement, this interface arrangement is tenon 4 or tongue-and-groove 5; Tenon 4 exceeds the projection of shaving board 1 and lower shaving board 3 edges 15mm～25mm formation for EPS plate 2; Tongue-and-groove 5 is the groove that EPS plate 2 is positioned at shaving board 1 and lower shaving board 3 edges 15mm～25mm formation, and the height of projection of preferred tenon 4 is 20mm, and preferred tongue-and-groove 5 groove depths are 20mm; The composite plate horizontal plane size of preferred control building settlement is 1m * 2m.The EPS plate is polystyrene foam plate, is a kind of architecture exterior wall insulating materials commonly used.
As shown in Figure 3, during use, with pack into the tongue-and-groove 5 of composite plate of another piece control building settlement of the tenon 4 of composite plate of a control building settlement, get final product in tenon 4 coating Building Adhesive when packing into.Can realize easily like this controlling splicing and installation between the composite plate of building settlement.According to the site operation needs, can cut the composite plate of control building settlement, to satisfy the needs of difformity basis or process range.
The composite plate planar dimension that the present invention controls building settlement is preferably 1m * 2m, and THICKNESS CONTROL is that 30mm～50mm does not wait.Wherein go up shaving board 1 and lower shaving board 3 preferred thickness are 5mm, middle EPS plate 2 thickness are 20mm～40mm.Use the glue bonding between shaving board and the EPS sheet material, can satisfy in transportation, construction and the tension of normal usage level load, the requirement of shearing resistance, two kinds of sheet materials can not thrown off under load action.The uniformity of EPS plate 2 pressurizeds in the middle of upper shaving board 1 and lower shaving board 3 can guarantee prevents that it is subject to the destruction of the sharp objects such as sole plate, foundation soil medium stone; Its effect of contraction can reduce the creep of EPS sheet material in work progress to a certain extent, and it is too fast to avoid arranging the foundation settlement of control building settlement composite plate part.
For bad ground building highrise building, the processing of ground is very complicated.Because it is very large that the Slag scar rises and falls, the bedrock surface buried depth of a part of ground very little (general bedrock surface apart from raft plate bottom surface height less than 0.5m), a raft plate part even can directly be supported on the basement rock, and the buried depth of bedrock of raft plate another part is larger.Surpass 10m at bedrock surface apart from raft plate bottom surface height, adopt the rigid pile Ground Treatment, to satisfy highrise building to the requirement of bearing capacity of foundation soil.Present common highrise building is 30～50 layers, and the load that acts on the ground is 350kPa～500kPa.The sedimentation of the treated composite foundation 20mm～30mm that is everlasting under this load level.For bedrock surface apart from raft plate bottom surface height less than the 0.5m ground, foundation settlement originally is zero substantially; If do not adopt the method Ground Treatment that increases settlement Control, the highrise building that will cause building at this complex foundation increases because of sedimentation uneven texture internal force.Therefore for the highrise building under the inhomogeneous condition of ground layering, especially to note the part bedrock surface apart from raft plate bottom surface height less than based process in the 0.5m situation.Implement the method for foundation settlement control of the present invention at this Foundation Part, set gradually the first grating sand stone layer 12, the compound flaggy 13 of control sedimentation, the second grating sand stone layer 14 and concrete cushion 15 at basement rock, at concrete cushion 15 raft plate 16 is set again, the suffered evenly distributed load of tall building foundation is substantially in the scope of 350kPa～500kPa, in such load scope, the decrement of Chipboard is 1～2mm only, and the decrement of EPS sheet material can reach about 20mm.Especially the synergy that cooperates the first grating sand stone layer 12, the second grating sand stone layer 14 and concrete cushion 15, the control compound flaggy 13 of sedimentation thickness after compression can be fixed on this size, the very large creep of appearance can be do not passed in time, namely the situation that decrement strengthens gradually can be under the load long term, do not occurred.Like this, foundation settlement originally is zero part substantially, implements the method for foundation settlement control of the present invention, and sedimentation can reach 20mm～30mm, with the common sedimentation of highrise building suitable (differential settlement is no more than 5mm).Thereby the problems such as the raft plate that relative settlement causes, the increase of superstructure internal force have effectively been reduced.
Claims (6)
1. one kind is used for the method that foundation settlement is controlled: it is characterized in that, need the ground of moderate control foundation settlement apart from raft plate bottom surface height less than 0.5m for bedrock surface, set gradually the first grating sand stone layer, the compound flaggy of control sedimentation, the second grating sand stone layer, concrete cushion and raft plate at basement rock; Wherein, the first grating sand stone layer and the second grating sand stone layer are that the graded sand and stone of 80mm～120mm thickness forms, and degree of compaction is 0.90～0.93, and concrete cushion is the thick plain concrete layer of 80mm～120mm.
The compound flaggy of described control sedimentation is spliced to form by the composite plate of polylith control building settlement; The composite plate of control building settlement is square structure, comprises shaving board, EPS plate, lower shaving board and interface arrangement; Upper shaving board and lower shaving board lay respectively at the up and down both sides of EPS plate; The thickness of upper shaving board and lower shaving board is 4mm～6mm; The thickness of EPS plate is 20mm～40mm, being provided with at least for the interface arrangement that splices of the composite plate of control building settlement on one side, and this interface arrangement is tenon or tongue-and-groove; Tenon is the projection that the EPS plate exceeds shaving board and lower shaving board edge 15mm～25mm formation; Tongue-and-groove is the groove that the EPS plate is positioned at shaving board and lower shaving board edge 15mm～25mm formation.
2. the method for foundation settlement control according to claim 1: it is characterized in that described the first grating sand stone layer and the second grating sand stone layer are that the thick graded sand and stone of 100mm forms.
3. the method for foundation settlement control according to claim 1: it is characterized in that described concrete cushion is the thick C15 plain concrete cushion layer of 100mm.
4. the method for foundation settlement control according to claim 1: it is characterized in that described upper shaving board and lower shaving board are bonded in EPS plate upper and lower surface by glue.
5. the method for foundation settlement control according to claim 1: it is characterized in that the thickness of described upper shaving board and lower shaving board is 5mm.
6. the method for foundation settlement control according to claim 1: it is characterized in that the height of projection of described tenon is 20mm, the groove depth of tongue-and-groove is 20mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310003104.3A CN103074885B (en) | 2013-01-05 | 2013-01-05 | Method for foundation settlement control |
| PCT/CN2013/090021 WO2014106432A1 (en) | 2013-01-05 | 2013-12-20 | Method for foundation settlement control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310003104.3A CN103074885B (en) | 2013-01-05 | 2013-01-05 | Method for foundation settlement control |
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| CN103074885A true CN103074885A (en) | 2013-05-01 |
| CN103074885B CN103074885B (en) | 2014-10-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014106432A1 (en) * | 2013-01-05 | 2014-07-10 | 华南理工大学 | Method for foundation settlement control |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109060532B (en) * | 2018-07-30 | 2023-09-15 | 中国地质大学（武汉） | Karst area ultra-long pile buckling stability indoor model experimental device and method |
| CN112541216B (en) * | 2020-12-08 | 2023-02-03 | 中国有色金属工业昆明勘察设计研究院有限公司 | Calculation method for ultimate uniform load distribution of karst cave covering layer surface |
| CN114969889A (en) * | 2022-04-18 | 2022-08-30 | 甘肃省公路交通建设集团有限公司 | Method for calculating stress of overhanging raft plate of piled raft foundation |
| CN115262608A (en) * | 2022-08-17 | 2022-11-01 | 中冀建勘集团有限公司 | Sparse-distributed rigid pile composite foundation with pile end being bedrock and construction method thereof |
Citations (4)
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|---|---|---|---|---|
| FR2858989A1 (en) * | 2003-08-20 | 2005-02-25 | Evolution Internat N2 Pty Ltd | Procedure for making a concrete supporting slab for a building consists of first loosening the ground to a given depth and then driving in piles to support the slab |
| JP2009235783A (en) * | 2008-03-27 | 2009-10-15 | Taisei Corp | Liquefaction countermeasure structure |
| CN201347560Y (en) * | 2009-01-09 | 2009-11-18 | 中国矿业大学 | Composite plate foundation for transmission tower in coal mine subsidence area |
| CN102535502A (en) * | 2011-12-29 | 2012-07-04 | 中国一冶集团有限公司 | Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074885B (en) * | 2013-01-05 | 2014-10-08 | 华南理工大学 | Method for foundation settlement control |
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- 2013-01-05 CN CN201310003104.3A patent/CN103074885B/en active Active
- 2013-12-20 WO PCT/CN2013/090021 patent/WO2014106432A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2858989A1 (en) * | 2003-08-20 | 2005-02-25 | Evolution Internat N2 Pty Ltd | Procedure for making a concrete supporting slab for a building consists of first loosening the ground to a given depth and then driving in piles to support the slab |
| JP2009235783A (en) * | 2008-03-27 | 2009-10-15 | Taisei Corp | Liquefaction countermeasure structure |
| CN201347560Y (en) * | 2009-01-09 | 2009-11-18 | 中国矿业大学 | Composite plate foundation for transmission tower in coal mine subsidence area |
| CN102535502A (en) * | 2011-12-29 | 2012-07-04 | 中国一冶集团有限公司 | Method for preventing settling and cracking of terrace with large area by utilizing combined prestressing concrete beams at region with soft soil layer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014106432A1 (en) * | 2013-01-05 | 2014-07-10 | 华南理工大学 | Method for foundation settlement control |
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| WO2014106432A1 (en) | 2014-07-10 |
| CN103074885B (en) | 2014-10-08 |
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