CN204780839U - Frozen soil back filling freezes quick detection device of intensity - Google Patents
Frozen soil back filling freezes quick detection device of intensity Download PDFInfo
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- CN204780839U CN204780839U CN201520287503.1U CN201520287503U CN204780839U CN 204780839 U CN204780839 U CN 204780839U CN 201520287503 U CN201520287503 U CN 201520287503U CN 204780839 U CN204780839 U CN 204780839U
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- frozen soil
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Abstract
The utility model discloses a frozen soil back filling freezes quick detection device of intensity, including drop hammer, guide slot, backing plate, pull wire, scale, through pull wire hammer lifting to the take the altitude that will fall, it drops hammer to let does the free fall motion along the guide slot, and the frozen soil sample on the backing plate is placed in the hammering, according to the number of times that the sample breaks and constantly drops hammer, differentiates the intensity of freezing of frozen soil. The utility model is used for differentiate the intensity of freezing of frozen soil back filling fast, simple swift, easily operation.
Description
Technical field
The utility model relates to a kind of checkout gear for detecting frozen soil freezing strength fast, belongs to frozen soil geotechnical properties field of test instrument.
Background technology
Cold regions engineering, in foundation construction process, mostly adopts open cut foundation.According to construction technology, the excavation of foundation ditch is carried out in basis first by big machinery, in the shaping foundation ditch of excavation, complete the assembled of the shaping of basis and concrete casting or basis, backfilling drawing the soil dug after basis completes, completing the construction on whole basis thus.Therefore, around basis, a large amount of backfill is defined.
Because backfill is as the one in artificial earth fill, being through the soil of disturbance, the initial stage after engineering construction completes, is the acute variation stage of backfill, and its consolidation process, internal structure change process, water-heat process etc. are all among constantly change; Under the Frozen-thawed cycled effect caused in variations in temperature especially, can there is violent change in the intensity of backfill, cause the Geological Hazard such as surface subsidence, cracking thus, drastically influence the stability of engineering foundation.
After cold regions engineering foundation construction completes, how scene is detected the intensity of foundation filling soil rapidly and according to test result evaluation backfill Strength Changes on the impact of engineering foundation stability, becomes a difficult problem for on-the-spot soil mass property Fast Measurement in the construction of current cold regions engineering.Although triaxial machining strength test can be carried out to Artificial Frozen Soil in laboratory at present determine its freezing strength, and formulated corresponding method of operating and technical standard (MT/T593.5-1996), but due to cold district soil strength and temperature closely related, to the accuracy of testing result be had a strong impact on as backfill core sample taken back experimental determination, and need at substantial manpower and materials and financial resources.In addition, the method of current in-situ evaluation soil strength mainly contains the (Code for investigation of geotechnical engineering such as cone penetration test, circular cone dynamic sounding test, standard penetration test and vane shear test, GB50021-2001), but above method standard is all formulated for the weak soil do not freezed, and to soil property type, soil particle size etc., there is strict requirement in often kind of experimental test process; Meanwhile, above detection method is used for the detection of frozen soil backfill intensity, once run into the Han Yan rock of 0 DEG C (temperature lower than) of Large stone, measurement result is by serious distortion; Moreover above each detection method all needs that dynamic power machine is auxiliary just can be completed, and is difficult to meet portable Fast Measurement requirement.
For the field quick detection of cold regions engineering foundation filling soil freezing strength, also lack corresponding checkout gear at present, and existing various detection method is not all suitable for the detection that Han Qu freezes backfill intensity.Therefore, design a kind of device for field quick detection backfill freezing strength, necessary with the difficult problem solving current permafrost region backfill freezing strength Fast Measurement.
Summary of the invention
Based on above-mentioned, the purpose of this utility model is to provide a kind of frozen soil backfill freezing strength device for fast detecting, its cardinal principle utilizes drift from the core sample immediately below certain altitude free-falling repeated stock is placed in certain specification size, according to ram impacts sample to number of shocks when breaking as the index of freezing strength weighing core.
The technical solution of the utility model is:
A kind of frozen soil backfill freezing strength device for fast detecting, primarily of dropping hammer, guide groove, backing plate, draught line and scale composition.Drop hammer and be placed in bottom guide groove, the draught line be connected is placed in outside guide groove with dropping hammer, and scale and support are fixed on backing plate, and support has pipe clamp, and pipe clamp clamps guide groove, and sample placed by backing plate, and sample is relative with guide groove.
Above-mentioned to drop hammer as the cylinder of rule or cuboid, and base plane, weight is 500g.
Above-mentioned backing plate is steel plate, and guide groove is the PE of interior smooth or pvc pipe or stainless steel tube; Draught line 4 is solid, soft fine rule
The sectional area of above-mentioned impact core sample is 100cm
2, thickness is 5cm.
The beneficial effect of advantage of the present utility model and generation:
The utility model is used for the freezing strength of field condition Quick frozen soil backfill, easy and simple to handle, acquired results is for passing judgment on the impact of backfill freezing strength on basis, the restriction of the factors such as not examined soil property type, granular size, and testing result accuracy has a large amount of field trial test datas to be statistical basis.
Accompanying drawing explanation
Fig. 1 is the utility model frozen soil backfill freezing strength device for fast detecting schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, a kind of frozen soil backfill freezing strength device for fast detecting, primarily of dropping hammer 1, guide groove 2, backing plate 3, draught line 4 and scale 5 form, and backing plate 3 is steel plate, can stand repeated stock and not yielding; Guide groove 2 is the PE of interior smooth or pvc pipe or stainless steel tube; Draught line 4 is solid, soft fine rule.Drop hammer and 1 be placed in bottom guide groove 2,1 draught line be connected 4 is placed in outside guide groove 2 with dropping hammer, and scale 5 and support 7 are fixed on backing plate 3, support 7 have geometrical clamp 8, and guide groove 2 clamped by geometrical clamp 8, backing plate 3 are placed sample 6, and sample 6 is relative with guide groove 2.
When utilizing the utility model to carry out the detection of frozen soil freezing strength, after core takes out, rapid intercepting one section of thickness is 5cm, sectional area cuts to about 100cm
2soil test block, then soil test block is placed horizontally on the backing plate 3 immediately below guide groove 2, then be that 500g drops hammer and 1 is promoted to 50cm height according to scale 5 by quality by draught line 4, then unclamp draught line 4 allow drop hammer 1 in guide groove 2 free-falling impact the soil test block of backing plate 3, so repeatedly, until sample is broken, the number of times of the sample of record drop impact, then according to the standard of table 1, the freezing strength of sample is passed judgment on.
This device is by a large amount of on-the-spot field test test, and the number of shocks of accumulating time broken according to sample, by the category division of cold regions engineering foundation filling soil freezing strength following (table 1).
Table 1 backfill freezing strength discrimination standard
Concrete discrimination standard content is as follows:
1. the weight of dropping hammer adopted in backfill freezing strength testing process is 500g, and free-falling is highly 50cm.
2. be roughly a cylinder by inspection soil sample, sectional area is about 100cm
2, thickness is about 5cm.
3. drop hammer and highly do freely falling body impact specimen with 50cm, weak frozen state is that sample is broken for some pieces in drop impact 8-12 underrange, claims this number of times to be weakly freeze hammer number.In like manner, to be sample be broken for some pieces dropping hammer to hit in 18-25 underrange to strong frozen state, claims this number of times for freeze hammer number by force.
If 4. core sample freezes, and drop hammer from 50cm with 500g and highly do freely falling body impact specimen, sample is broken for some pieces in 8-12 number being less than weak freezing, then frozen soil freezing strength is judged to be weak freezing.
If 5. core sample freezes, and drop hammer from 50cm with 500g and highly do freely falling body impact specimen, sample weakly freezes 8 numbers and is less than to freeze by force to be broken for some pieces in 25 numbers being greater than, then core freezing strength is judged to freeze.
If 6. core sample freezes, and drop hammer from 50cm with 500g and highly do freely falling body impact specimen, sample is broken for some pieces being greater than to freeze by force to be greater than in 25 numbers, then core freezing strength is judged to freeze by force.
For avoiding in test process temperature on the impact of sample freezing strength, cut in specimen and must bring mitten, device plank or cardboard can be gone along with sb. to guard him, to avoid in sample impact process solar radiation and ground air convection current on the impact of measurement result simultaneously.
Claims (4)
1. a frozen soil backfill freezing strength device for fast detecting, comprise drop hammer (1), guide groove (2), backing plate (3), draught line (4) and scale (5), it is characterized in that: drop hammer (1) is placed in the bottom of guide groove (2), the draught line (4) be connected with drop hammer (1) is placed in guide groove (2) outward, scale (5) and support (7) are fixed on backing plate (3), support (7) there is pipe clamp (8), pipe clamp (8) clamps guide groove (2), backing plate (3) is placed sample (6), and sample (6) is relative with guide groove (2).
2. a kind of frozen soil backfill freezing strength device for fast detecting according to claim 1, it is characterized in that dropping hammer (1) for regular cylinder or cuboid, and bottom is plane, weight is 500g.
3. a kind of frozen soil backfill freezing strength device for fast detecting according to claim 1, is characterized in that: described backing plate (3) material is steel plate, the PE that guide groove (2) is interior smooth or pvc pipe or stainless steel tube; Draught line (4) is solid, soft fine rule.
4. a kind of frozen soil backfill freezing strength device for fast detecting according to claim 1, is characterized in that: the sectional area of described sample (6) is 100cm2, thickness is 5cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520287503.1U CN204780839U (en) | 2015-05-06 | 2015-05-06 | Frozen soil back filling freezes quick detection device of intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520287503.1U CN204780839U (en) | 2015-05-06 | 2015-05-06 | Frozen soil back filling freezes quick detection device of intensity |
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| Publication Number | Publication Date |
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| CN204780839U true CN204780839U (en) | 2015-11-18 |
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| CN201520287503.1U Expired - Fee Related CN204780839U (en) | 2015-05-06 | 2015-05-06 | Frozen soil back filling freezes quick detection device of intensity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004619A (en) * | 2015-05-06 | 2015-10-28 | 中国科学院寒区旱区环境与工程研究所 | Freezing strength on-site fast detection device for backfill soil in frozen soil area |
-
2015
- 2015-05-06 CN CN201520287503.1U patent/CN204780839U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004619A (en) * | 2015-05-06 | 2015-10-28 | 中国科学院寒区旱区环境与工程研究所 | Freezing strength on-site fast detection device for backfill soil in frozen soil area |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20180506 |