CN104404940B - A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device - Google Patents
A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device Download PDFInfo
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- CN104404940B CN104404940B CN201410734401.XA CN201410734401A CN104404940B CN 104404940 B CN104404940 B CN 104404940B CN 201410734401 A CN201410734401 A CN 201410734401A CN 104404940 B CN104404940 B CN 104404940B
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- concrete
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- block
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- load
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The present invention relates to deep layer soil layer parameters of loading measuring technique.The invention discloses a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device, comprise drive system, datalogger, load box and concrete are from steady block, described datalogger is connected with load box by pipeline with drive system, gather payload data and drive load box to run, described load box comprises bearing plate, casing, hydraulic mechanism and sensor, described bearing plate is connected with hydraulic mechanism, move along a straight line under hydraulic mechanism drives, to soil layer transmission of pressure, described hydraulic mechanism is encapsulated in casing, described casing is cast in concrete in steady block, described sensor is connected with datalogger, transmit payload data, described concrete from steady block for keeping the stable and balance of load box, prevent load box from tilting, and load box is sealed, described load box, concrete has symmetrical structure from steady block, its axis of symmetry overlaps.The present invention can the parameters of loading of test beds.
Description
Technical field
The present invention relates to deep layer soil layer parameters of loading measuring technique, particularly a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device.
Background technology
The bearing capacity of foundation soil carries out the most important index of civil construction project design-calculated.But up to the present, the defining method of all foundation soil bearing capacities is suitable only for shallow, middle level soil layer (soil depth≤40m), there is no the defining method to Deep Soil Layers bearing capacity and on-site testing device.Along with constantly advancing of China's building cause, increasing civil construction project enters ultra-deep stratum.In order to make the design of ultra-deep foundation safer, more stable and more reasonable, reducing blindness, just must solve deep soil load-bearing capacity and these key issues of deformation characteristic.And the most reliable solution of these problems, carry out site test exactly.In prior art, general by burying pressure apparatus and sensor in reinforced concrete pile underground, by applying the bearing capacity of the upper and lower pile body of pressure test to pile body, do not possess the ability of carrying out soil body load-bearing capacity and deformation behaviour test in Deep Soil Layers.Prior art measurement mechanism casing and pile body can not be separate, the bearing capacity of upper and lower pile body can only be tested, the bearing capacity of any degree of depth soil body can not be tested, do not possess the ability of carrying out soil body load-bearing capacity and deformation behaviour test in Deep Soil Layers, do not possess self-stable ability, can not antidumping, anti-side oblique.
Summary of the invention
Technical matters to be solved by this invention, is just to provide a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device, stress is directly acted on deep layer soil layer, the parameters of loading of test beds.
The present invention solve the technical problem, the technical scheme adopted is, a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device, comprise drive system, datalogger, load box and concrete are from steady block, described datalogger is connected with load box by pipeline with drive system, gather payload data and drive load box to run, it is characterized in that, described load box comprises bearing plate, casing, hydraulic mechanism and sensor, described bearing plate is connected with hydraulic mechanism, move along a straight line under hydraulic mechanism drives, to soil layer transmission of pressure, described hydraulic mechanism is encapsulated in casing, described casing is cast in concrete in steady block, described sensor is connected with datalogger, transmit payload data, described concrete from steady block for keeping the stable and balance of load box, prevent load box from tilting, and load box is sealed, described load box, concrete has symmetrical structure from steady block, its axis of symmetry overlaps.
Load test device of the present invention, except bearing plate is as relatively independent parts, can under hydraulic mechanism drives outside motion, whole device is in sealing state, high earth pressure and deep-water pressure can be tolerated, particularly concrete is from steady block, except having the effect of balance and stability load box, further increases the voltage endurance capability of device.
Concrete, described hydraulic mechanism is made up of N platform lifting jack, is uniformly distributed along described axis of symmetry, and its piston is connected with bearing plate, and N is natural number, N >=1.
Adopt N platform hydraulic jack as propulsion system, can obtain according to designing requirement the pressure needed.N platform lifting jack is uniformly distributed along bearing plate axis of symmetry, can apply uniform pressure, prevent load box from tilting further to bearing plate, and is conducive to improving measuring accuracy.
Concrete, described concrete needs to determine according to test with size from surely block-shaped.
Concrete according to test beds concrete condition, can need applied pressure size from surely block-shaped, size and weight, and the situations such as the particular location that device is placed calculate, thus obtains the concrete that needs from steady block-shaped and size.
Concrete, described sensor comprises pressure transducer, displacement transducer and obliquity sensor, and described pressure transducer is arranged on bearing plate, and institute's displacement sensors is arranged between casing and bearing plate, and described obliquity sensor is arranged on wall box.
Technical scheme of the present invention, sensor mainly contains pressure transducer, displacement transducer and obliquity sensor.Pressure transducer is arranged on bearing plate, is applied to pressure on foundation bed for measuring bearing plate.Displacement transducer is arranged between casing and bearing plate, for measuring the displacement data that pile foundation soil layer under pressure declines.Obliquity sensor is arranged on wall box, for measuring the inclination angle produced when pressure soil under action layer declines.The data that these sensors gather, through computer disposal, just can obtain the payload data of foundation bed, for construction work provides science data.
Further, floor is distributed with around described casing.
Floor is set at casing periphery, casing intensity and anti-pressure ability can be strengthened, ensure that load box normally can work in Deep Soil Layers.
Preferably, described casing is cylindrical, and described floor is uniformly distributed along described cylindrical radial.
Adopt cylindrical box, be a kind of box shape relatively simple for structure, coordinate radial equally distributed floor, can casing be improved withstand voltage.
Preferably, described concrete is cylindrical concrete soil block or truncated cone concrete block from steady block.
This programme adopts and the cylindrical concrete soil block of cylindrical box form fit or truncated cone concrete block, build mode configuration simple, draw materials conveniently, the stability of measurement mechanism and anti-tilt capability can be improved further, and be conducive to the voltage endurance capability improving measurement mechanism.
Preferably, described concrete is prismatic concrete block or frustum of a pyramid shape concrete block from steady block.
Adopt prismatic or frustum of a pyramid shape concrete block, also be that a kind of conventional concrete is from surely block-shaped, particularly employing bottom surface is the concrete block of foursquare four-prism or positive tetragonous cone table shape, can also improve measurement mechanism stability and anti-tilt capability further.
Especially, described bearing plate is circular or square.
This programme adopts circular or square bearing plate, coordinates, can obtain uniform pressure at right angle with along the equally distributed hydraulic mechanism of axis of symmetry, is conducive to improving the precision measured.
The invention has the beneficial effects as follows, measurement mechanism is independently device, does not rely on other building structure.Measurement mechanism of the present invention can be used in various degree of depth soil layer and measures, and directly apply pressure to soil layer, the data of measurement directly react the parameters of loading of soil layer, can provide more scientific, soil layer data more accurately for construction work.Device of the present invention has self-stable ability, and resistance to capsizing is strong, and the parameters of loading being applicable to very much deep layer soil layer and deep water ground is measured.
Accompanying drawing explanation
Fig. 1 is the load test apparatus structure schematic diagram of embodiment 1;
Fig. 2 is embodiment 1 load box structural representation;
Fig. 3 is the A-A cut-open view of Fig. 2;
Fig. 4 is the B-B cut-open view of Fig. 2;
Fig. 5 is the load test apparatus structure schematic diagram of embodiment 2;
Fig. 6 is the distribution schematic diagram of three lifting jack in embodiment 3.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
Deep Soil Layers high pressure waterproof self-stabilising load test device of the present invention, comprises drive system, datalogger, load box and concrete from steady block.Datalogger is connected with load box by pipeline with drive system, gathers payload data and drives load box to run.The data such as soil layer load, pressure, sedimentation, inclination angle of collection are carried out calculation process by datalogger, finally can obtain the trial value of deep soil body load-sedimentation and deformation curve and Ultimate bearing Capacity.Load box of the present invention comprises bearing plate, casing, hydraulic mechanism and sensor.Bearing plate is connected with hydraulic mechanism, move along a straight line under hydraulic mechanism drives, to soil layer transmission of pressure, described hydraulic mechanism is encapsulated in casing, and surrounded by floor, described casing and floor are cast in concrete in steady block, described sensor is connected with datalogger, transmit payload data, described concrete for keeping load box to stablize and balance from steady block, prevents load box from tilting, and seals load box, described load box, concrete have symmetrical structure from steady block, and its axis of symmetry overlaps.This structure has stronger self-stability, is conducive to the accuracy of stability and the measurement keeping load box to run.
Embodiment 1
This routine load test apparatus structure as shown in Figure 1, is made up of from steady block 4 drive system 1, datalogger 2, load box 3 and concrete.Datalogger 2 is connected with load box 3 by pipeline 13 with drive system 1, gathers payload data and drives load box 3 to run.This routine load box 3 structure as shown in Figure 2, Figure 3 and Figure 4, comprises bearing plate 31, casing 32, hydraulic mechanism, floor 33 and sensor (not shown).This routine hydraulic mechanism is made up of oil pump 34 and a lifting jack 35, and lifting jack is arranged on load box axis of symmetry XY, and as shown in Figure 1, axis of symmetry XY is also the axis of symmetry of this routine concrete from steady block 4.In Fig. 2, bearing plate 31 adopts circular steel plate to form, and in order to increase rigidity, can weld the reinforcement of some.Bearing plate 31 center is connected with the piston of lifting jack 35, linearly can move downward, to soil layer transmission of pressure under lifting jack 35 drives.This routine oil pump 34 and lifting jack 35 are all encapsulated in casing 32, and are surrounded by floor.This routine casing 32 and floor 33 adopt certain thickness steel plate to make, and casing 32 is cylindrical structural, and floor 33 is radially evenly distributed on around cylindrical box, by welding fabrication after-pouring at concrete in steady block 4.In order to prevent bearing plate 31 from being clung by concrete, affecting it and moving, one deck rubber diaphragm 43 can be covered on bearing plate 31 during casting concrete, as shown in Figure 1.This ratio sensor comprises pressure transducer, displacement transducer and obliquity sensor.Pressure transducer is arranged on bearing plate 31, and displacement transducer is arranged between casing 32 and bearing plate 31, and obliquity sensor is arranged on casing 32 sidewall.Soil layer can be subject to pressure that lifting jack effect produces by these sensors, displacement and tilt parameters convert electric signal input datalogger to, completes the transmission of payload data.As seen from Figure 1, this routine concrete can keep load box 3 to stablize and balance from steady block 4, prevents load box 3 from tilting, and seals load box 3.In Fig. 1, load box 3, concrete have symmetrical structure from steady block 4 and bearing plate 31, and its axis of symmetry is XY.
This routine load box can according to situations such as MTD, soil layer and underground water, by special designing and calculating to box sizes and version, box sealing form and degree, lifting jack range and oil pump reserves, concrete from the shape of steady block, test components and parts size and specification, throughput etc. are determined.This routine load box casing adopts cylindrical box, and casing all edges cylindrical radial is evenly distributed with floor, can improve the anti-pressure ability of casing, strengthen body structure intensity, adapt to Deep Soil Layers pressure or deep-water pressure after casting concrete.This routine concrete adopts the concrete block of the frustum of a cone from steady block, as shown in Figure 1.The key dimension of concrete block is: the distance L1 of upper base diameter Q1, the diameter P1 that goes to the bottom, highly L2, angle β and upper base and casing, these dimensional parameters can carry out calculating according to concrete test situation and determine.
During test, open drive system on the ground, oil pump in drive case, oil pump applies hydraulic oil to lifting jack load application, and jack piston rod is extrapolated, promotes bearing plate and progressively exerts pressure to bottom soil body, until damage of soil body.The data such as load, pressure, sedimentation, inclination angle reach ground by pipeline, finally can obtain the trial value of deep soil body load-sedimentation and deformation curve and Ultimate bearing Capacity.
Embodiment 2
This routine load test device, as shown in Figure 5, wherein concrete is four-prism shape concrete block from the shape of steady block 4 to structure, the square of the upper bottom surface of concrete block and bottom surface to be the length of side be P1, concrete block height is L2, and the distance of upper bottom surface and load box is L1.This routine concrete block has symmetrical structure equally, overlaps with the axis of symmetry XY of load box.This routine load box structure is identical with embodiment 1.
Embodiment 3
This routine load test device, as shown in Figure 6, wherein hydraulic mechanism is made up of three lifting jack structure, and this routine bearing plate adopts circular steel plate to form, and because steel plate area is comparatively large, for preventing being out of shape during pressurization, adding floor, strengthening the rigidity of bearing plate.As seen from Figure 6, three lifting jack are uniformly distributed along bearing plate axis of symmetry, and its piston rod is connected with bearing plate, the vertical movement of common promotion bearing plate.Other structures of this example can see the description of above-described embodiment.
Claims (8)
1. a Deep Soil Layers high pressure waterproof self-stabilising load test device, comprise drive system, datalogger, load box and concrete are from steady block, described datalogger is connected with load box by pipeline with drive system, gather payload data and drive load box to run, it is characterized in that, described load box comprises bearing plate, casing, hydraulic mechanism and sensor, described bearing plate is connected with hydraulic mechanism, move along a straight line under hydraulic mechanism drives, to soil layer transmission of pressure, described hydraulic mechanism is encapsulated in casing, described casing is cast in concrete in steady block, described sensor is connected with datalogger, transmit payload data, described concrete from steady block for keeping the stable and balance of load box, prevent load box from tilting, and load box is sealed, described load box, concrete has symmetrical structure from steady block, its axis of symmetry overlaps, described concrete needs to determine according to test with size from surely block-shaped.
2. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, it is characterized in that, described hydraulic mechanism is made up of N platform lifting jack, is uniformly distributed along described axis of symmetry, and its piston is connected with bearing plate, and N is natural number, N >=1.
3. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, it is characterized in that, described sensor comprises pressure transducer, displacement transducer and obliquity sensor, described pressure transducer is arranged on bearing plate, institute's displacement sensors is arranged between casing and bearing plate, and described obliquity sensor is arranged on wall box.
4. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, is characterized in that, be distributed with floor around described casing.
5. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 4, it is characterized in that, described casing is cylindrical, and described floor is uniformly distributed along described cylindrical radial.
6. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, it is characterized in that, described concrete is cylindrical concrete soil block or truncated cone concrete block from steady block.
7. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, it is characterized in that, described concrete is prismatic concrete block or frustum of a pyramid shape concrete block from steady block.
8. a kind of Deep Soil Layers high pressure waterproof self-stabilising load test device according to claim 1, is characterized in that, described bearing plate is circular or square.
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| CN201410734401.XA CN104404940B (en) | 2014-12-05 | 2014-12-05 | A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device |
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| CN201410734401.XA CN104404940B (en) | 2014-12-05 | 2014-12-05 | A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device |
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| CN104404940B true CN104404940B (en) | 2016-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107607405A (en) * | 2017-09-06 | 2018-01-19 | 东南大学 | A kind of standard penetrometer and operating method for the test of deep soil loaded deformation |
| CN109930636B (en) * | 2019-04-09 | 2021-06-08 | 东南大学 | Device for measuring bearing capacity of deep foundation at bottom of open caisson and installation and measurement method thereof |
| CN112525711B (en) * | 2020-11-26 | 2023-08-22 | 中国电建集团成都勘测设计研究院有限公司 | Bidirectional deep soil mechanical parameter in-situ testing device and testing structure |
| CN115450269B (en) * | 2022-09-16 | 2023-04-25 | 江西联保工程咨询有限公司 | Production device of plate-type load box with steel-concrete structure |
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| CN204370398U (en) * | 2014-12-05 | 2015-06-03 | 西南交通大学 | A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5420936B2 (en) * | 2009-03-12 | 2014-02-19 | 長野計器株式会社 | Automatic plate loading test equipment |
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Patent Citations (7)
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|---|---|---|---|---|
| GB1455721A (en) * | 1973-02-01 | 1976-11-17 | Univ Strathclyde | Measuring device for testing soil |
| CN2175933Y (en) * | 1993-11-24 | 1994-08-31 | 卢丽莎 | Deep-foundation flat load testing instrument |
| CN1831511A (en) * | 2006-04-06 | 2006-09-13 | 上海市隧道工程轨道交通设计研究院 | Deep horizontal load testing method |
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