CN108396793B - Simple cement soil impervious sample manufacturing method - Google Patents
Simple cement soil impervious sample manufacturing method Download PDFInfo
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- CN108396793B CN108396793B CN201810484829.1A CN201810484829A CN108396793B CN 108396793 B CN108396793 B CN 108396793B CN 201810484829 A CN201810484829 A CN 201810484829A CN 108396793 B CN108396793 B CN 108396793B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a simple manufacturing method of a cement soil impervious sample, and belongs to the technical field of geotechnical tests. The manufacturing device required by the manufacturing method mainly comprises a sample preparation cylinder, a sample pressing plug and a working base plate with bolts. The sample preparation cylinder is a half cylinder, and two cylinder sheets are assembled together through a clamp and fixed on a working backing plate. And extruding the cement soil which is uniformly stirred by the sample pressing plug, manufacturing a cement soil sample, and sealing to obtain the sample required by the impermeability test. The lower end of the sample preparation barrel is provided with a flange which is fixed on the working backing plate through bolts. The sample prepared by the preparation method has uniform compactness, can avoid cracks in the later maintenance process, and is simple and efficient to operate.
Description
Technical Field
The invention relates to a simple manufacturing method of a cement soil impervious sample, and belongs to the technical field of geotechnical tests.
Background
In the process of excavation of the foundation pit, a water level difference exists between the inside and the outside of the foundation pit. Under the action of the water head, water outside the foundation pit can infiltrate into the foundation pit, and when serious, sand flow or surge can occur, so that the foundation pit is damaged. The waterproof curtain can effectively prevent the damage, and the underground water permeated in the foundation pit can be greatly reduced and is easier to drain. In the foundation pit excavation engineering, when the buried depth of underground water is shallow and the permeability coefficient of a soil layer is large, a waterproof curtain can be arranged around the foundation pit by taking cement and soil as materials. The cement soil is a mixture of soil and cement, and a high-pressure jet grouting pile construction machine is generally adopted in engineering, and cement slurry is mixed into the soil body to form the cement soil. Therefore, it is necessary to know the impermeability characteristics of the soil cement in order to determine the optimal mixing ratio of cement in the soil cement, which requires performing an impermeability test of the soil cement.
The preparation of the cement soil impervious sample is a very key link, and the quality of the sample directly influences the accuracy of a test result. At present, there are two types of shapes of impervious samples produced in a laboratory: cylindrical and frustoconical. Considering that the cement soil sample sampled by the site drill core is cylindrical, the impervious sample of the cement soil prepared indoors should be preferably cylindrical in order to facilitate comparison with the test result of the sample obtained on site. Conventionally, a ring cutter is generally used to prepare such a cylindrical sample.
In the process of manufacturing a cylindrical sample by using a ring cutter, cement soil is compacted in a layering manner, so that the compactness of the sample is easily uneven, and cracks are easily generated in the interlayer bonding position in subsequent maintenance. All the factors can influence the test result, and a more reasonable cement soil impervious sample manufacturing method is needed to be developed.
Disclosure of Invention
The invention aims to solve the defects and problems existing in the prior art and provides a simple manufacturing method of a cement soil impervious sample.
The invention provides a simple manufacturing method of a cement soil impervious sample, which mainly comprises a sample preparation cylinder, a sample pressing plug, a clamp and a working base plate, wherein the non-conventional manufacturing device is used for manufacturing the cement soil impervious sample; the sample preparation cylinder is a half type, and two cylinder pieces are assembled together through a clamp; the lower end of the barrel piece is provided with a flange, and the middle part of the flange is provided with a bolt hole; an upward bolt is welded on the working backing plate, passes through a bolt hole on the flange of the barrel piece and is provided with a corresponding nut so as to fix the sample preparation barrel; when the cement soil impervious sample is manufactured, the following steps are adopted:
step 1: taking two barrel pieces, forming a sample preparation barrel relatively, arranging a clamp on the outer side of the sample preparation barrel, installing a clamp bolt, and screwing up a clamp nut to enable the spliced parts of the barrel pieces to be in close contact;
step 2: placing the sample preparation cylinder on a flat working base plate, adjusting the position, enabling flange bolts to pass through flange bolt holes, installing and screwing flange nuts, and brushing mineral oil to the inner cavity wall of the sample preparation cylinder to serve as a release agent;
step 3: weighing the cement soil sample soil which is uniformly stirred, slowly pouring the cement soil sample soil into a sample preparation cylinder, and leveling;
step 4: then the sample pressing plug is put into a sample preparation cylinder, the upper surface of the sample pressing plug is enabled to be level with the upper end face of the sample preparation cylinder by slowly applying pressure, and the sample pressing plug is kept for 5 minutes under the pressurized state;
step 5: unscrewing a clamp nut, removing the clamp, unscrewing a flange nut, lifting a sample preparation cylinder, separating cylinder sheets, and removing a sample pressing plug to obtain a cement soil sample;
step 6: and (3) taking a cutting ring, horizontally placing the cutting ring on a hard plastic backing plate, placing the cement soil sample obtained in the step (5) in the middle position in the cutting ring, enabling the gap between the cement soil sample and the inner wall of the cutting ring to be uniform, injecting heated paraffin liquid into the gap by using a needle tube, ensuring sealing, and obtaining the cement soil impervious sample after 1 hour.
The sample preparation cylinder adopts a half type to facilitate taking out the prepared sample, and avoid damaging and damaging the sample when the sample is directly pushed out of the cylinder (such as a ring cutter). The cement soil required for manufacturing one sample is filled into the sample preparation cylinder at one time, so that the problems of uneven compactness caused by layered compaction, easy crack generation of the subsequent sample and the like can be avoided. And an upward bolt is welded on the working backing plate and used for fixing the sample cylinder.
The inner diameter of the sample preparation cylinder is 56mm, the outer diameter is 66mm, and the height is 80mm. This is because, when a permeation resistance test is subsequently performed, the test specimen needs to be put into a cutter ring and wax-sealed. The inner diameter of the cutting ring is 61.8mm and the height is 40mm. After the prepared sample is placed in a cutting ring, a gap of approximately 3.0mm is formed, so that the flow of heated paraffin liquid can be met, and the sample is tightly wrapped.
The diameter of the sample pressing plug is 55.4mm, and the height is 40mm. The height of the sample is 40mm, the height of the sample pressing plug is 40mm, and the height of the sample preparing cylinder is 80mm. During sample preparation, the weighed sample soil is poured into the sample preparation cylinder, the sample pressing plug is placed after leveling, the upper surface of the sample pressing plug is enabled to be flush with the top surface of the sample preparation cylinder by pressing the sample pressing plug, and then the cement soil sample with the diameter of 56mm and the height of 40mm is obtained.
The clamp is formed by assembling two clamp pieces, and the inner diameter of the clamp pieces is 55mm. The internal diameter of clamp piece slightly is less than the external diameter of system appearance section of thick bamboo, is in order to install the clamp after, remains certain clearance between two clamp pieces of a clamp, is convenient for after tightening the clamp nut of clamp bolt assembly, and the clamp can be closely with two section of thick bamboo slices extrusion.
The sample preparation cylinder, the sample pressing plug, the clamp, the working backing plate and all bolts and nuts are made of stainless steel. This is to ensure that the resulting sample is not contaminated with rust and also to increase the service life of the device.
Compared with the existing manufacturing method, the method can form the sample at one time in the manufacturing process of the cement soil sample, and the problem of later cracking of the sample caused by multi-layer compaction is avoided; the stress of the sample is uniform in the process of compacting the cement soil, so that the compactness is ensured to be uniform; the manufacturing device adopted by the manufacturing method is simple to manufacture, low in cost, convenient to operate, and simple and efficient in manufacturing flow of the sample.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of a cartridge.
Fig. 3 is a schematic view of a clip.
Fig. 4 is a cross-sectional view A-A in fig. 2.
The drawing is marked: 1-barrel tablets; 2-clamping; 3-pressing a sample plug; 4-clamp bolts; 5-sampling soil; 6-clamping nuts; 7-clamping hoop sheets; 8-flanges; 9-a working backing plate; 10-flange bolt holes; 11-flange bolts; 12-flange nut.
Detailed Description
The following is a specific embodiment of the present invention, and the technical solution of the present invention is described with reference to the accompanying drawings.
Examples
The simple manufacturing method of the cement soil impervious sample in the embodiment mainly comprises a sample preparation cylinder, a sample pressing plug 3, a clamp 2 and a working base plate 9, and particularly refers to fig. 1, 2, 3 and 4. The working plate 9 is welded with upward facing flange bolts 11 which pass through flange bolt holes 10 in the flange 8 of the cartridge 1 and are fitted with corresponding flange nuts 12 to secure the cartridge. The sample preparation barrel consists of two barrel pieces 1, the lower ends of the barrel pieces 1 are provided with flanges 8, the barrel pieces are assembled together through a clamp 2 at the outer side, the inner diameter is 56mm, the outer diameter is 66mm, and the height is 80mm. The diameter of the plunger 3 was 55.4mm and the height was 40mm. The middle part of the flange 8 is provided with a flange bolt hole 10. The clamp 2 is composed of two clamp pieces 7, and is connected together by two clamp bolt assemblies in the diameter direction, the clamp bolt assemblies including a clamp bolt 4 and a clamp nut 6. In the non-operating state, the inner diameter of the clip piece 7 is 55mm. The sample preparation cylinder, the sample pressing plug 3, the clamp 2, the clamp bolt component, the working backing plate 9, the flange bolt 11 and the flange nut 12 are all made of stainless steel. When the cement soil impervious sample is manufactured, the following steps are adopted:
step 1: taking two barrel pieces 1, forming a sample preparation barrel relatively, arranging a clamp 2 at the outer side of the sample preparation barrel, installing a clamp bolt 4, and screwing a clamp nut 6 to enable the spliced parts of the barrel pieces 1 to be in close contact;
step 2: placing the sample preparation cylinder on the upper surface of a flat working base plate 9, adjusting the position, enabling flange bolts 11 to pass through flange bolt holes 10, installing and screwing flange nuts 12, and brushing mineral oil to the inner cavity wall of the sample preparation cylinder to serve as a release agent;
step 3: weighing the cement soil sample 5 which is uniformly stirred, slowly pouring the cement soil sample into a sample preparation cylinder, and leveling;
step 4: placing the sample pressing plug 3 into a sample preparation cylinder, placing a flat plate extending out of the periphery of the sample pressing plug 3 on the sample pressing plug 3, slowly applying pressure on the flat plate until the flat plate cannot move downwards, enabling the upper surface of the sample pressing plug 3 to be level with the upper end surface of the sample preparation cylinder, and keeping for 5 minutes in a pressurized state, wherein the purpose is to avoid large rebound deformation of a formed cement soil sample;
step 5: unscrewing the clamp nut 6, removing the clamp 2, unscrewing the flange nut 12, lifting the sample preparation barrel, separating the barrel piece 1, and removing the sample pressing plug 3 to obtain a cement soil sample;
step 6: and (3) taking a cutting ring, horizontally placing the cutting ring on a hard plastic backing plate, placing the cement soil sample obtained in the step (5) in the middle position in the cutting ring, enabling the gap between the cement soil sample and the inner wall of the cutting ring to be uniform, injecting heated paraffin liquid into the gap by using a needle tube, ensuring sealing, and obtaining the cement soil impervious sample after 1 hour.
The foregoing description of the specific embodiments is provided for the purpose of illustration only and is not intended to limit the scope of the claims.
Claims (5)
1. A simple manufacturing method of a cement soil impervious sample is characterized by comprising the following steps: the adopted manufacturing device mainly comprises a sample preparation cylinder, a sample pressing plug, a clamp and a working base plate; the sample preparation cylinder is a half type, and two cylinder pieces are assembled together through a clamp; the lower end of the barrel piece is provided with a flange, and the middle part of the flange is provided with a bolt hole; an upward bolt is welded on the working backing plate, passes through a bolt hole on the flange of the barrel piece and is provided with a corresponding nut so as to fix the sample preparation barrel; when the cement soil impervious sample is manufactured, the following steps are adopted:
step 1: taking two barrel pieces, forming a sample preparation barrel relatively, arranging a clamp on the outer side of the sample preparation barrel, installing a clamp bolt, and screwing up a clamp nut to enable the spliced parts of the barrel pieces to be in close contact;
step 2: placing the sample preparation cylinder on a flat working base plate, adjusting the position, enabling flange bolts to pass through flange bolt holes, installing and screwing flange nuts, and brushing mineral oil to the inner cavity wall of the sample preparation cylinder to serve as a release agent;
step 3: weighing the cement soil sample soil which is uniformly stirred, slowly pouring the cement soil sample soil into a sample preparation cylinder, and leveling;
step 4: then the sample pressing plug is put into a sample preparation cylinder, the upper surface of the sample pressing plug is enabled to be level with the upper end face of the sample preparation cylinder by slowly applying pressure, and the sample pressing plug is kept for 5 minutes under the pressurized state;
step 5: unscrewing a clamp nut, removing the clamp, unscrewing a flange nut, lifting a sample preparation cylinder, separating cylinder sheets, and removing a sample pressing plug to obtain a cement soil sample;
step 6: and (3) taking a cutting ring, horizontally placing the cutting ring on a hard plastic backing plate, placing the cement soil sample obtained in the step (5) in the middle position in the cutting ring, enabling the gap between the cement soil sample and the inner wall of the cutting ring to be uniform, injecting heated paraffin liquid into the gap by using a needle tube, ensuring sealing, and obtaining the cement soil impervious sample after 1 hour.
2. The simple cement soil impervious sample manufacturing method according to claim 1, which is characterized by comprising the following steps: the inner diameter of the sample preparation cylinder is 56mm, the outer diameter is 66mm, and the height is 80mm.
3. The simple cement soil impervious sample manufacturing method according to claim 1, which is characterized by comprising the following steps: the diameter of the plunger was 55.4mm and the height was 40mm.
4. The simple cement soil impervious sample manufacturing method according to claim 1, which is characterized by comprising the following steps: the clamp is assembled by two clamp pieces, and the internal diameter of clamp piece is 55mm.
5. The simple cement soil impervious sample manufacturing method according to claim 1, which is characterized by comprising the following steps: the sample preparation cylinder, the sample pressing plug, the clamp, the working backing plate and all bolts and nuts are made of stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810484829.1A CN108396793B (en) | 2018-05-20 | 2018-05-20 | Simple cement soil impervious sample manufacturing method |
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| CN201810484829.1A CN108396793B (en) | 2018-05-20 | 2018-05-20 | Simple cement soil impervious sample manufacturing method |
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| CN108396793B true CN108396793B (en) | 2023-06-20 |
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| CN205538394U (en) * | 2016-03-15 | 2016-08-31 | 中国电建集团华东勘测设计研究院有限公司 | Soil cement triaxial test's system appearance ware |
| CN107192650B (en) * | 2017-04-14 | 2020-12-08 | 广西交通科学研究院有限公司 | Method for taking undisturbed soil permeability test soil sample by wax sealing |
| CN107389408A (en) * | 2017-08-17 | 2017-11-24 | 中国建筑东北设计研究院有限公司 | A kind of triaxial test sample preparation device and method for making sample |
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