CN201917484U - Saturation Apparatus for Hollow Cylindrical Clay Samples - Google Patents

Abstract

The utility model discloses a saturation device of a hollow cylindrical clay sample. The saturation device comprises a metal outer die, a fixture, an air bag and an isolation layer, wherein the air bag is matched with the inner wall face of the clay sample after being filled with air; the fixture comprises two splints, a pull rod and a nut which is in threaded connection with the pull rod; the metal outer die is arranged between the two splints, and is connected integrally with two splints positioned at the upper and lower ends of the metal outer die through the pull rod and the nut; moreover, a filter layer and a water permeable layer are sequentially arranged between the hollow cylindrical clay sample and each splint; the isolation layer is arranged between the metal outer die and the hollow cylindrical clay sample; and the air bag is provided with air holes. The saturation device has a simple structure and a low cost, is easy to realize, is easy and convenient to operate, can effectively prevent the hollow cylindrical clay sample from being collapsed when being saturated and prevent the sample from being bonded with a sample preparation die during die removal, and is an efficient and practical saturation device of the hollow cylindrical clay sample.

Description

Saturation Apparatus for Hollow Cylindrical Clay Samples

technical field

The utility model relates to a sample preparation device, in particular to a hollow cylindrical clay sample saturation device.

Background technique

At present, the indoor soil dynamics test is an important technical means to realize the dynamic stress path simulation and property evaluation of soil in engineering, but because the actual load changes are very complicated, it is often necessary to simplify the stress path simulation in the laboratory. Since the hollow cylinder can realize the continuous rotation of the principal stress direction on the soil sample unit, it can become one of the first choice test equipment for studying the behavior of soil under loads such as earthquakes, vehicles, and waves.

Although the hollow cylindrical test equipment has been developed considerably since its invention in the 1980s, and many achievements have been made, there has been no unified standard for the preparation device of the hollow cylindrical sample. Since the wall of the hollow cylindrical sample is thin and there is no support inside, when it is saturated, water seeps in and causes the sample to soften, and it is easy to make it sink or collapse; while the existing metal sample preparation mold often sticks to the clay sample, causing the sample After compaction, it is easy to cause deformation or even damage when separated. These defects are more obvious for hollow samples, which makes the test results lose their due value.

Utility model content

The utility model aims at the deficiencies of the prior art, and provides a hollow cylindrical clay sample saturation device to solve the technical problem that the hollow cylindrical clay sample lacks internal support, and overcome the damage test caused by the adhesion of the clay material and the sample preparation mold. A hollow cylindrical clay sample saturation device is provided to eliminate the defects of the outer wall of the sample and even the overall structure.

For realizing above technical purpose, the utility model will take following technical scheme:

A saturating device for a hollow cylindrical clay sample, comprising a metal outer mold, the inner wall of the metal outer mold is adapted to the outer wall of the hollow cylindrical clay sample, and also includes a clamp, which is matched with the inner wall of the hollow cylindrical clay sample after being filled with gas Adapted airbag and isolation layer, the fixture includes two splints, pull rods and nuts threaded with the pull rods, the metal outer mold is placed between the two splints, and the metal outer mold and the two splints located at the upper and lower ends of the metal outer mold In addition, a filter layer and a water-permeable layer are sequentially arranged between the hollow cylindrical clay sample and the splint; an isolation layer is arranged between the metal outer mold and the hollow cylindrical clay sample; There are pores.

The cross-section of the metal outer mold is circular, and the metal outer mold is set separately, and rubber waterstop strips are installed at the joints of the adjacent two splits; The hoop on the outer wall of the outer mold is tightened.

The isolation layer is made of non-adhesive plastic film.

The metal outer mold is provided with an air suction nozzle.

The air hole of the airbag is sunken in the inner cavity of the airbag.

According to the above technical scheme, the following beneficial effects can be achieved:

The present invention arranges an air bag inside the hollow cylindrical clay sample, and provides support for the hollow cylindrical clay sample by inflating the air bag, effectively preventing the inward collapse of the clay sample; An isolation layer is set between the molds to effectively prevent the metal outer mold from sticking to the clay sample and avoid damaging the clay sample when the mold is removed; Air extraction can ensure that the plastic film is tightly attached to the metal outer mold, effectively avoiding the wrinkling and damage of the plastic film and affecting its effect; when removing the sample, since the plastic film is non-sticky, the metal outer mold and the clay sample are easily peeled off without causing sample removal. perturbation damage to the sample. Therefore, the utility model is simple in structure, easy to implement, easy to operate, low in cost, and can effectively prevent the hollow cylindrical clay sample from collapsing when it is saturated and the adhesion between the sample and the sample preparation mold during sample preparation and demoulding. It is an efficient and practical A hollow cylindrical clay sample saturation device.

Description of drawings

Fig. 1 is a schematic diagram of the working principle of the utility model;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a sectional view along line A-A in Fig. 1;

Fig. 4 is a top view of the cylindrical plastic airbag in Fig. 1;

Fig. 5 is the front view of Fig. 4;

Among them: 1, rubber strip; 2, plastic film; 3, hoop; 4, air hole; 5, rubber mouth; 6, splint; 7, air hole; 8, filter layer; 9, permeable layer; 10, nut; 11 1. Tie rod positioning groove; 12. Hollow cylindrical clay sample; 13. Air bag; 14. Metal outer mold; 15. Pull rod; 16. Rubber waterstop.

Detailed ways

The accompanying drawings disclose the structural schematic diagrams of the preferred embodiments involved in the utility model without limitation, and the technical solution of the utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 5, the saturation device of the hollow cylindrical clay sample described in the utility model includes a metal outer mold 14, a clamp, an air bag 13 adapted to the inner wall surface of the hollow cylindrical clay sample 12 after filling gas, and an isolation layer , the inner wall of the metal outer mold 14 is compatible with the outer wall of the hollow cylinder clay sample 12, the clamp includes two splints 6, a pull rod 15 and a nut 10 threaded with the pull rod, and the metal outer mold 14 is placed on two Between the splints 6, and the metal outer mold 14 and the two splints 6 located at the upper and lower ends of the metal outer mold 14 are connected into one body through the pull rod 15 and the nut 10, and the splint 6 is provided with a pull rod positioning groove 11 for the pull rod 15 to pass through; In addition, a filter layer 8 and a water-permeable layer 9 are sequentially arranged between the hollow cylindrical clay sample 12 and the splint 6, wherein the water-permeable layer 9 is paved with permeable stones, and the filter layer 8 is made of filter paper; the metal outer mold 14 An isolation layer is set between the sample and the clay sample, the isolation layer is made of non-adhesive plastic film 2, the air bag 13 is provided with air holes, and as shown in Figure 4 and Figure 5, the air holes of the air bag 13 are sunk in the The inner cavity of the airbag 13 is set to ensure that the top of the airbag 13 is flush with the sample, which is convenient for inflation and deflation, and does not affect the placement of permeable stones during the saturation process. In addition, the airbag 13 is a plastic airbag 13.

Described metal outer mold 14 splits are arranged, and metal outer mold 14 shown in accompanying drawing 3 is two splits, and the seam place of adjacent two splits installs rubber waterstop strip 16; The split body is tightened by a hoop 3 sleeved on the outer wall of the metal outer mold 14, and the hoop 3 is a stainless steel hoop 3. The metal outer mold 14 is provided with an air extraction nozzle, and the air extraction nozzle is preferably arranged near the middle and lower part of the metal outer mold 14 . This suction mouth is made up of suction hole 4 and rubber mouth 5. The cross section of the metal outer mold 14 is circular, and the metal outer mold 14 is equal to the hollow cylinder clay sample 12 .

Before saturation, place permeable stones and filter paper in sequence at the bottom of the saturation device, that is, on the splint 6 at the lower end.

For the original clay sample: the prepared hollow cylinder clay sample 12 is placed on the filter paper, the plastic film 2 is sleeved on the outside, the two metal outer molds 14 are closed, and the stainless steel hoop 3 is used to tighten it. A plastic airbag 13 is placed inside the hollow cylindrical clay sample 12 and inflated through the pores so that it is in close contact with the inner wall of the hollow cylindrical clay sample 12 . Place filter paper, permeable stone and upper splint 6 sequentially on the top of the hollow cylindrical clay sample 12, and press them by splints 6 and pull rods located at the upper and lower ends of the metal outer mold 14 respectively, and install nuts 10 on the pull rods to tighten.

For the disturbed soil sample: before preparing the hollow cylinder clay sample 12, tighten the cylinder formed by the parts of the metal outer mold 14 through the stainless steel hoop 3, place a plastic film 2 on the inner wall of the metal outer mold 14, and the plastic film 2 5-6cm higher than the metal outer mold 14, the two ends of the plastic film 2 are turned over to the outer wall of the metal outer mold 14, and the rubber strip 1 is used to tighten the seal, and the air is sucked through the air suction hole and the rubber nozzle 5, so that the plastic film 2 is close to the outer wall of the metal outer mold 14. On the inner wall of the metal outer mold 14, the rubber mouth 5 is sealed with a water stop clip. After using a compactor to hit the soil to make it layered and compacted into a sample, a plastic airbag 13 is placed inside the hollow cylindrical clay sample 12 and inflated through the air holes, so that the plastic airbag 13 is in close contact with the inner wall of the hollow cylindrical clay sample 12 . Place filter paper and permeable stones at both ends of the clay sample, and press it through the splint 6 and the pull rod, and install the nut 10 on the pull rod to tighten.

Finally, the hollow cylindrical clay sample 12 is loaded into a saturator and subjected to suction and saturation. After the saturation is completed, unscrew the nut 10, and remove the splint 6 and the tie rod. Unclamp the stainless steel hoop 3, and remove the metal outer mold 14 and the plastic film 2 successively. The plastic air bag 13 is deflated through the air hole, and the plastic air bag 13 is taken out. Put the saturated hollow cylindrical clay sample 12 into the pressure chamber of the hollow cylindrical instrument to carry out the follow-up test.

Claims (5)

1. the saturation device of a hollow cylinder clay sample, comprise metal outer mold, the outside wall surface of described metal outer mold internal face and hollow cylinder clay sample is suitable, it is characterized in that: also comprise anchor clamps, behind the filling gas with the suitable air bag of hollow cylinder clay sample internal face, separation layer, described anchor clamps comprise two clamping plate, pull bar and the nut that is connected with pull rod screw, described metal outer mold places between two clamping plate, and metal outer mold and be positioned at metal outer mold up and down two clamping plate at two ends link into an integrated entity by pull bar and nut, in addition, order is provided with filtering layer and pervious bed between described hollow cylinder clay sample and the clamping plate; Between described metal outer mold and the hollow cylinder clay sample separation layer is set; Described air bag is provided with pore.

2. according to the saturation device of the described hollow cylinder clay sample of claim 1, it is characterized in that: the xsect of described metal outer mold is circular, and this metal outer mold split is provided with the seam crossing installation Rubber water stop bar of adjacent two splits; Each split of metal outer mold is by being socketed in the shroud ring banding of metal outer mold outside wall surface simultaneously.

3. according to the saturation device of claim 1 or 2 described hollow cylinder clay samples, it is characterized in that: described separation layer adopts inviscid plastic sheeting to make.

4. according to the saturation device of claim 1 or 2 described hollow cylinder clay samples, it is characterized in that: described metal outer mold is provided with the mouth of bleeding.

5. according to the saturation device of claim 1 or 2 described hollow cylinder clay samples, it is characterized in that: sink into the setting of air bag internal cavities in the pore of described air bag.

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