CN103276755B - Raft foundation bottom soil body void deformation monitoring device - Google Patents
Raft foundation bottom soil body void deformation monitoring device Download PDFInfo
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- CN103276755B CN103276755B CN201310226393.3A CN201310226393A CN103276755B CN 103276755 B CN103276755 B CN 103276755B CN 201310226393 A CN201310226393 A CN 201310226393A CN 103276755 B CN103276755 B CN 103276755B
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Abstract
The invention discloses a raft foundation bottom soil body void deformation monitoring device which comprises a steel plate located under a raft and arranged horizontally. An anchoring rod used for being anchored under the raft is arranged on the bottom face of the steel plate, an inner steel bar vertically arranged is fixed on the top face of the steel plate, a raft steel pipe vertically arranged and poured with the raft integrally is sleeved on the outside of the inner steel bar, the outer diameter of the inner steel bar is smaller than the inner diameter of the raft steel pipe, an outer protection pipe fixed on the inside of an embankment is sleeved on the outside of the raft steel pipe, and the outer diameter of the raft steel pipe is smaller than the inner diameter of the outer protection pipe. The monitoring device has the advantages of facilitating tests, being high in measuring accuracy, good in adaptability, good in long-term effectiveness and low in cost, and can be widely applied to the technical field of foundation deformation monitoring.
Description
Technical field
The present invention relates to foundation deformation monitoring technical field, particularly relate to raft foundation bottom soil body void deformation monitoring device.
Background technology
Reinforced concrete pile raft structure (pile slab structure), can be used for the engineering such as deep layer soft foundation, collapsible loess foundation, basement transition stage, switch area roadbed that settlement Control is strict, because its advantage is obvious, in recent years, in high-speed railway subgrade engineering, have also been obtained extensive use.
But when engineering ground for owing consolidation foundation soil, banket, the foundation soil type such as mollisol, collapsible loess, salinized soil time, along with the generation of later stage foundation soil sedimentation and deformation, usually occur that foundation soil bottom raft plate and raft plate come to nothing phenomenon, cause raft plate bottom pile foundation exposed, not only reduce a durability for raft structure (pile slab structure), also have impact on its mechanical characteristic under the dynamic loadings such as train, ground stabilization effect is seriously reduced.
The method of testing of the distortion of coming to nothing of current raft plate bottom foundation soil mainly contains following two kinds: one, by burying the contact force between earth pressure cell monitoring raft plate bottom inter-pile soil and raft plate underground, indirectly reflect whether foundation soil exists phenomenon of coming to nothing, this method only can reflect whether there is phenomenon of coming to nothing bottom raft plate, and cannot reflect degree and the value of distortion of coming to nothing, and the long-term effectiveness of earth pressure cell is not enough; Two, in foundation soil and raft plate is arranged respectively the components and parts of sinking deformation monitoring, reflect whether foundation soil exists phenomenon of coming to nothing by the difference of both observational deformations, and measuring and calculating is come to nothing the value of distortion.Usually, the distortion of raft plate is by burying settlement plate underground to monitor, and the monitoring accuracy of settlement plate is generally at about 1mm, and certainty of measurement is inadequate; And foundation soil sedimentation and deformation generally adopts single point settlement gage to record, the long-term effectiveness of components and parts is more difficult to get guarantee.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of raft foundation bottom soil body void deformation monitoring device be provided, make it have convenient test, certainty of measurement is high, applicability good, long-term effectiveness is good and cost is low feature.
A kind of raft foundation bottom soil body void deformation monitoring device provided by the invention, comprise the steel plate being positioned at raft plate lower horizontal and arranging, described steel plate bottom surface is provided with the anchor pole in the foundation soil be anchored in by steel plate below raft plate, steel plate end face is fixed with the inner side reinforcing bar vertically arranged, the raft slab pipe of the vertical setting together with being cast in raft slab integral is arranged with outside the reinforcing bar of described inner side, the external diameter of inner side reinforcing bar is less than raft slab bore, be arranged with the outside pillar be fixed in embankment outside described raft slab pipe, the external diameter of raft slab pipe is less than outside pillar internal diameter.
In technique scheme, reinforcing bar top, described inner side is higher than raft plate steel pipe top, and described raft plate steel pipe top is higher than outside pillar, and pillar top, described outside is higher than embankment end face.
In technique scheme, described inner side reinforcing bar, raft slab pipe and outside pillar are coaxially arranged.
In technique scheme, reinforcing bar top, described inner side is fixed with assisting measurement block.
In technique scheme, described inner side reinforcing bar, raft slab pipe and outside pillar are formed by connecting by multistage reinforcing bar, multistage steel pipe and multistage pillar respectively.
In technique scheme, the top of described outside pillar is provided with over cap, and described over cap is connected with outside pillar by screw thread or hinge.
In technique scheme, described inner side reinforcing bar and raft slab tube-surface are provided with antirusting paint layer or antirust oil enamelled coating.
In technique scheme, between described raft plate and steel plate, be fixed with PVC film layer.
In technique scheme, 0.1 ~ 0.2m bottom described steel plate end face distance raft plate.
Raft foundation bottom soil body void deformation monitoring device of the present invention, has following beneficial effect: the sequence of construction of raft foundation bottom soil body void deformation monitoring device is: 1, the pile foundation construction of stake raft structure (pile slab structure) composite foundation; 2, flatten rammed subgrade soil bottom surface, adopt short anchor to be anchored in foundation soil by steel plate, inner side reinforcing bar is welded in steel plate center vertically; 3, by raft slab pipe box on the reinforcing bar of inner side, frame shuttering construction raft plate; 4, outside pillar is placed on raft slab pipe, placement in layers embankment; 5, along with the increase of embankment height, inner side reinforcing bar, raft slab pipe, outside pillar all should be increased, piecemeal until embankment completes; 6, an assisting measurement block is welded on reinforcing bar top, inner side after having filled.
After having constructed, according to the frequency requirement of deformation monitoring, adopt the spacing of vernier caliper measurement assisting measurement block and raft slab pipe over time, certainty of measurement can reach 0.01mm, whether can accurately measure comes to nothing bottom raft plate and between foundation soil is out of shape, and calculates the size of distortion of coming to nothing.Come to nothing when being out of shape if monitored data shows that raft plate and the foundation soil under it exist, further according to the deformation extent that comes to nothing of monitoring, slip casting or other control measures can be taked.
Advantage of the present invention is as follows: 1, the present invention improves and forms on the basis of conventional settlement plate, not only possesses the function of monitoring raft foundation bottom soil body void distortion, and the function of conventional settlement plate is also still effective, can accomplish that a plate is multiplex; 2, the present invention adopts conventional slide measure to measure, and precision can reach 0.01mm, measures far above the leveling instrument of routine; 3, described inner side reinforcing bar, raft slab pipe, outside pillar and embankment end face are arranged from high to low is difference conveniently inside vernier caliper measurement between reinforcing bar and raft slab pipe; 4, described inner side reinforcing bar, raft slab pipe and outside pillar are all coaxially arranged is do not affect each other when measuring to ensure, and improves certainty of measurement; 5, the setting of described assisting measurement block is the fixing of conveniently slide measure two external pelivimetry pawls, is conducive to measuring; 6, described inner side reinforcing bar, raft slab pipe and outside pillar are formed by connecting by multistage reinforcing bar, multistage steel pipe and multistage pillar respectively, are corresponding to the construction method that embankment layering is built by laying bricks or stones, prevent from being subject to because once building by laying bricks or stones shaping and being corroded or artificial destruction; 7, arranging over cap is that rainwater and foreign material from falling between inner side reinforcing bar and raft slab pipe, standoff effects Detection results between raft slab pipe and outside pillar in order to prevent; 8, because the present invention has multiple hardware, for improving rust resistance, described inner side reinforcing bar and raft slab tube-surface are provided with antirusting paint layer or antirust oil enamelled coating; 9, concrete and steel plate for avoiding raft plate in casting process bond together, by being fixed with PVC film layer or making 0.1 ~ 0.2m bottom steel plate end face distance raft plate, to avoid the generation of this situation between raft plate and steel plate.
In sum, the advantage that the present invention has simple structure, cost is low, precision is high, convenient test, long-term effectiveness are good.
Accompanying drawing explanation
Fig. 1 is the structural representation of raft foundation bottom soil body void deformation monitoring device of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
See Fig. 1, raft foundation bottom soil body void deformation monitoring device of the present invention, comprises steel plate 1, anchor pole 2, inner side reinforcing bar 3, raft slab pipe 4, outside pillar 5, assisting measurement block 6 and over cap 7.
First carry out pile foundation 11 to construct, be then anchored in the foundation soil 9 below raft plate 8 by anchor pole 2 by the steel plate 1 of one piece of horizontal positioned, in the present embodiment, described steel plate 1 can be square, and also can be circular, the length of side or diameter be generally 30 ~ 40cm; Described anchor pole 2 is short anchor, and short anchor can make for plain bar, and indented bars also can be adopted to make, and tip form need be made in bottom, adopts welding manner, steel plate 1 and short anchor is linked together, and forms overall structure.Steel plate 1 end face is fixed with the inner side reinforcing bar 3 vertically arranged, and inner side reinforcing bar 3 need adopt plain bar, adopts the steel plate 1 of welding manner and bottom to be connected firmly.Be arranged with outside described inner side reinforcing bar 3 integrated poured with raft plate 8 together with the raft slab pipe 4 of vertical setting, the external diameter 1cm less of raft slab pipe 4 internal diameter of inner side reinforcing bar 3.Be arranged with the outside pillar 5 be fixed in embankment 10 outside described raft slab pipe 4, the external diameter of raft slab pipe 4 is less than outside pillar 5 internal diameter.Reinforcing bar 3 top, described inner side is higher than raft slab pipe 4 top, and described raft slab pipe 4 top is higher than outside pillar 5, and pillar 5 top, described outside is higher than embankment 10 end face.Described inner side reinforcing bar 3, raft slab pipe 4 and outside pillar 5 are coaxially arranged.Raft slab pipe 4 can adopt galvanized iron conduit, before construction raft plate 8, is placed on by raft slab pipe 4 on the reinforcing bar 3 of inner side, and ensures that inner side reinforcing bar 3 is positioned at the center of raft slab pipe 4, and then concreting makes raft slab pipe 4 and raft plate 8 concrete form overall structure.Outside pillar 5 can adopt PVC plastic pipe, after raft plate 8 has been constructed, is placed on raft slab pipe 4 by outside pillar 5 before embankment 10 fills, and ensures that outside pillar 5 is concentric with raft slab pipe 4.Described inner side reinforcing bar 3, raft slab pipe 4 and outside pillar 5 are formed by connecting by multistage reinforcing bar, multistage steel pipe and multistage pillar respectively, namely along with the increase of embankment 10 filled height, inner side reinforcing bar 3, raft slab pipe 4, outside pillar 5 all should be increased piecemeal, and segmentation is increased length and is generally about 0.6 ~ 1.0m.Adopt welding between reinforcing bar 3 segmentation of inner side or be threaded: when employing is welded to connect, after welding completes, reply welding position polishing light circle, can not move to avoid snapping in raft slab pipe 4; When employing is threaded, should ensure that fixing connecting is firm.Raft slab pipe 4 generally adopts and is welded to connect, and after having welded, also tackles welding position polishing light circle, can not move to avoid snapping in the pillar 5 of outside.Outside pillar 5 adopts glue to connect.Segmentation meets Gao Houying and ensures: inner side reinforcing bar 3 top is higher than raft slab pipe 4 top, and raft slab pipe 4 top is higher than outside pillar 5 top, and outside pillar 5 top is higher than embankment 10 surface of filling end face.By the relative settlement on slide measure (not shown) monitoring inner side reinforcing bar 3, raft slab pipe 4 top, can reflect whether to there occurs to come to nothing between raft plate 8 and the foundation soil it under 9 and be out of shape, and accurately can reflect the size of coming to nothing and being out of shape.
Reinforcing bar 3 top, described inner side is fixed with assisting measurement block 6, described assisting measurement block 6 is a circular metal plate, diameter is consistent with raft slab pipe 4, after embankment 10 has filled, be welded on the reinforcing bar 3 of inner side, by the change of vernier caliper measurement assisting measurement block 6 with the spacing of raft slab pipe 4, not only can reflect and be out of shape with or without coming to nothing bottom raft plate 8 and between foundation soil 9, the size of distortion of coming to nothing can also be accurately calculated.
The top of described outside pillar 5 is provided with over cap 7, and described over cap 7 is connected with outside pillar 5 by screw thread or hinge.Over cap 7 can be metal or hard PVC material, for the protection of inner side reinforcing bar 3 and raft slab pipe 4, affects monitoring effect in the space that can prevent rainwater and foreign material from falling into this device.Adopt screw thread rotation or hinge to be installed on the pillar 5 of outside so that be easy to during deformation measurement to take off, measure after be easy to fixing.
Described inner side reinforcing bar 3 and raft slab pipe 4 surface are provided with antirusting paint layer or antirust oil enamelled coating.This is because multiple composition component of the present invention is metal construction, for improving its rust resistance, constructing one section, antirusting paint or antirusting paint should be adopted to smear one section.PVC film layer is fixed with between described raft plate 8 and steel plate 1, or 0.1 ~ 0.2m bottom described steel plate 1 distance from top raft plate 8, this is for being avoided the concrete of raft plate 8 in casting process and steel plate 1 to be bonded together.
In order to ensure certainty of measurement, generally need fixation measuring position, survey crew and measuring apparatus.And embankment 10 fills in process, should safeguard measure be carried out, in order to avoid filler falls into inner side reinforcing bar 3 or raft slab pipe 4, affect measurement effect and certainty of measurement.
The sequence of construction of raft foundation bottom soil body void deformation monitoring device is: 1, the pile foundation 11 of stake raft structure (pile slab structure) composite foundation is constructed; 2, flatten rammed subgrade soil 9 bottom surfaces, adopt short anchor to be anchored in foundation soil 9 by steel plate 1, inner side reinforcing bar 3 is welded in vertically steel plate 1 center; 3, raft slab pipe 4 is placed on the reinforcing bar 3 of inner side, frame shuttering construction raft plate 8; 4, outside pillar 5 is placed on raft slab pipe 4, placement in layers embankment 10; 5, along with the increase of embankment 10 filled height, inner side reinforcing bar 3, raft slab pipe 4, outside pillar 5 all should be increased piecemeal, until embankment 10 has filled; 6, an assisting measurement block 6 is welded on inner side reinforcing bar 3 top after having filled.
After having constructed, according to the frequency requirement of deformation monitoring, adopt the spacing of vernier caliper measurement assisting measurement block 6 and raft slab pipe 4 over time, certainty of measurement can reach 0.01mm, whether can accurately measure comes to nothing bottom raft plate 8 and between foundation soil 9 is out of shape, and calculates the size of distortion of coming to nothing.Come to nothing when being out of shape if monitored data shows that raft plate 8 and its lower foundation soil 9 exist, further according to the deformation extent that comes to nothing of monitoring, slip casting or other control measures can be taked.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content be not described in detail in this manual belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. a raft foundation bottom soil body void deformation monitoring device, it is characterized in that: comprise the steel plate (1) being positioned at raft plate (8) lower horizontal and arranging, described steel plate (1) bottom surface is provided with the anchor pole (2) be anchored in by steel plate (1) in raft plate (8) below foundation soil (9), steel plate (1) end face is fixed with the inner side reinforcing bar (3) vertically arranged, be arranged with outside described inner side reinforcing bar (3) integrated poured with raft plate (8) together with the raft slab pipe (4) of vertical setting, the external diameter of inner side reinforcing bar (3) is less than raft slab pipe (4) internal diameter, the outside pillar (5) be fixed in embankment (10) is arranged with outside described raft slab pipe (4), the external diameter of raft slab pipe (4) is less than outside pillar (5) internal diameter, reinforcing bar (3) top, described inner side is higher than raft slab pipe (4) top, described raft slab pipe (4) top is higher than outside pillar (5), pillar (5) top, described outside is higher than embankment (10) end face, reinforcing bar (3) top, described inner side is fixed with assisting measurement block (6).
2. raft foundation bottom soil body void deformation monitoring device according to claim 1, is characterized in that: described inner side reinforcing bar (3), raft slab pipe (4) and outside pillar (5) are coaxially arranged.
3. raft foundation bottom soil body void deformation monitoring device according to claim 1 and 2, is characterized in that: described inner side reinforcing bar (3), raft slab pipe (4) and outside pillar (5) are formed by connecting by multistage reinforcing bar, multistage steel pipe and multistage pillar respectively.
4. raft foundation bottom soil body void deformation monitoring device according to claim 1 and 2; it is characterized in that: the top in described outside pillar (5) is provided with over cap (7), described over cap (7) is connected with outside pillar (5) by screw thread or hinge.
5. raft foundation bottom soil body void deformation monitoring device according to claim 1 and 2, is characterized in that: described inner side reinforcing bar (3) and raft slab pipe (4) surface are provided with antirusting paint layer or antirust oil enamelled coating.
6. raft foundation bottom soil body void deformation monitoring device according to claim 1 and 2, is characterized in that: be fixed with PVC film layer between described raft plate (8) and steel plate (1).
7. raft foundation bottom soil body void deformation monitoring device according to claim 1 and 2, is characterized in that: described steel plate (1) end face distance raft plate (8) bottom 0.1 ~ 0.2m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310226393.3A CN103276755B (en) | 2013-06-07 | 2013-06-07 | Raft foundation bottom soil body void deformation monitoring device |
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| CN201310226393.3A CN103276755B (en) | 2013-06-07 | 2013-06-07 | Raft foundation bottom soil body void deformation monitoring device |
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| CN103276755B true CN103276755B (en) | 2015-05-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105672239B (en) * | 2016-01-21 | 2017-09-12 | 中铁第四勘察设计院集团有限公司 | A kind of monitoring device deformed for karst region and goaf railway bed ground collapse |
| CN105667541B (en) * | 2016-01-21 | 2018-01-26 | 中铁第四勘察设计院集团有限公司 | Medium-and low-speed maglev is low to be put circuit support rail beam and subgrade settlement and comes to nothing value monitoring device |
| CN113218350A (en) * | 2021-05-15 | 2021-08-06 | 柴庆刚 | Highway engineering high-fill abutment back of body bridgehead attachment gap monitoring forecasting device that comes to nothing |
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| CN101016733A (en) * | 2007-01-08 | 2007-08-15 | 中铁西北科学研究院有限公司 | Multiple points settlement observation method and device therefor |
| CN201109914Y (en) * | 2007-11-05 | 2008-09-03 | 黄广军 | Apparatus for monitoring sedimentation of soft soil foundation |
| CN101078220B (en) * | 2007-06-19 | 2010-09-01 | 中国科学院武汉岩土力学研究所 | Soft soil roadbed settlement monitoring method and device |
| CN201665880U (en) * | 2010-01-12 | 2010-12-08 | 浙江大学 | Soil mass internal displacement measuring device |
| CN203270628U (en) * | 2013-06-07 | 2013-11-06 | 中铁第四勘察设计院集团有限公司 | Emptying and deformation monitoring device of raft foundation bottom soil body |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7380462B2 (en) * | 2005-03-25 | 2008-06-03 | G-Tech. Co., Ltd. | Apparatus and method for measuring supporting force of large diameter ferroconcrete piles |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016733A (en) * | 2007-01-08 | 2007-08-15 | 中铁西北科学研究院有限公司 | Multiple points settlement observation method and device therefor |
| CN101078220B (en) * | 2007-06-19 | 2010-09-01 | 中国科学院武汉岩土力学研究所 | Soft soil roadbed settlement monitoring method and device |
| CN201109914Y (en) * | 2007-11-05 | 2008-09-03 | 黄广军 | Apparatus for monitoring sedimentation of soft soil foundation |
| CN201665880U (en) * | 2010-01-12 | 2010-12-08 | 浙江大学 | Soil mass internal displacement measuring device |
| CN203270628U (en) * | 2013-06-07 | 2013-11-06 | 中铁第四勘察设计院集团有限公司 | Emptying and deformation monitoring device of raft foundation bottom soil body |
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