Collapsible loess collapsibility characteristic testing device

Abstract

The utility model discloses a collapsible loess collapsibility characteristic testing device, and belongs to the technical field of loess collapsibility characteristic testing equipment. Comprising a test bench, and a storage cylinder is placed on the test bench; a supporting frame is fixedly connected to the test bed, a hydraulic machine is arranged in the supporting frame, and the working end of the hydraulic machine is fixedly connected with a pressing plate. A water storage tank is formed in the pressing plate, a plurality of water leakage holes communicating with the water storage tank are formed in the bottom of the pressing plate, and the water leakage holes are evenly distributed in the bottom of the pressing plate; a sealing assembly is arranged in the water storage tank in an up-down sliding mode, and the sealing assembly corresponds to the water leakage hole in position. The water injection structure is arranged in the pressing plate, two purposes are achieved, and the influence of water injection nonuniformity and water injection impact on the test accuracy can be avoided through the evenly-distributed water leakage holes and the hydraulic machine.

Description

TECHNICAL FIELD

[0001] The utility model provides a collapsible loess collapsible characteristic test device belongs to loess collapsible characteristic test equipment technical field. BACKGROUND

[0002] Collapsible loess is a common engineering geological material, widely distributed in northwest and north China. This loess will significantly reduce the volume under the action of water, that is, the collapsibility phenomenon, which has important influence on building engineering and infrastructure construction. The collapsible characteristics of collapsible loess, such as collapsibility coefficient, collapsible deformation, etc., are directly related to the safety and stability of engineering design and construction. Therefore, accurate detection and evaluation of the collapsible characteristics of collapsible loess have important practical significance for preventing and controlling engineering disasters.

[0003] The traditional collapsible loess collapsible characteristic test device usually includes a container containing loess and a pressure instrument. Water is injected into the container containing loess to simulate water infiltration under natural conditions, and the pressure instrument is used to simulate the pressure on the loess caused by buildings and the like above the loess. The volume change of the loess under the conditions of water infiltration and certain pressure is observed to identify the collapsible characteristics. However, when a large amount of loess is tested, the loess is easily unevenly infiltrated by water when water is injected, which affects the accuracy of the test; at the same time, when water is injected, the water flow falls from a high place and is affected by free fall, which easily causes impact on the loess and leads to slight subsidence of the loess, which also affects the accuracy of the test; in view of the above problems, a new test device is needed to solve them. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is that when testing the collapsible characteristics of loess, water injection to simulate water infiltration under natural conditions is easy to cause uneven water injection, and the impact of water flow also causes subsidence of loess, thereby affecting the accuracy of the test.

[0005] In order to solve the above problems, the utility model provides a collapsible loess collapsible characteristic test device, which comprises a test table, a storage cylinder placed on the test table, and loess placed in the storage cylinder; a support frame is fixedly connected to the test table, a hydraulic machine is arranged in the support frame, and the working end of the hydraulic machine is fixedly connected with a pressing plate located directly above the storage cylinder; a water storage groove is formed in the pressing plate, and a water injection hole communicating with the water storage groove is formed in the pressing plate; a plurality of water leakage holes communicating with the water storage groove are formed in the bottom of the pressing plate, and the water leakage holes are evenly distributed in the bottom of the pressing plate; a closing assembly is slidably arranged in the water storage groove, and the closing assembly corresponds to the position of the water leakage hole; a water receiving groove is formed in the test table, and a mesh plate is fixedly arranged in the water receiving groove; the storage cylinder is placed on the mesh plate, and a drainage hole is formed in the bottom of the storage cylinder.

[0006] As improved, the closing assembly comprises a lifting plate and a plug rod, the lifting plate is arranged in the water storage tank in up and down sliding mode, and the plug rod is fixedly connected to the bottom of the lifting plate.

[0007] As improved, the lifting plate is attached to the bottom of the water storage tank, the bottom of the lifting plate is provided with a sealing gasket, and the lifting plate blocks all the water leakage holes; the plug rod is inserted into the water leakage hole, and the number of the plug rod is the same as that of the water leakage hole.

[0008] As improved, a screw rod is rotatably connected in the pressing plate, and the lifting plate is threadedly connected to the screw rod; a limiting rod is fixedly arranged in the pressing plate, and the lifting plate is slidably sleeved on the limiting rod.

[0009] As improved, two positioning holes are formed in the bottom of the storage cylinder, and a positioning rod fixedly connected to the net-shaped plate is inserted into the positioning hole.

[0010] As improved, the sidewall of the test bench is provided with a drain pipe communicated with the water collecting groove, and a valve is arranged on the drain pipe.

[0011] As improved, the storage cylinder is made of transparent material, and the outer wall of the storage cylinder is provided with a scale.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. A water storage tank is formed in the pressing plate, a plurality of water leakage holes communicated with the water storage tank are formed in the bottom of the pressing plate, and the water leakage holes are evenly distributed in the bottom of the pressing plate; by arranging the evenly distributed water leakage holes, the uniformity of water injection during the test can be ensured, the loess is uniformly penetrated by water, and the accuracy of the test is ensured. At the same time, the pressing plate can be driven to approach the loess by using the hydraulic machine, the impact of water flow on the loess during water injection is reduced, the loess subsidence caused by water flow impact is avoided, and the accuracy of the test is improved.

[0014] 2. A closing assembly is arranged in the water storage tank in up and down sliding mode, the water injection process can be freely controlled, therefore, the pressing plate can be used to simulate the pressure received by the loess, and the pressing plate can be used to uniformly inject water, which is very convenient and achieves two goals at one stroke. DRAWINGS

[0015] Figure 1 It is a perspective view of the collapsible loess collapsible characteristic test device.

[0016] Figure 2 It is a perspective view of the collapsible loess collapsible characteristic test device from another angle.

[0017] Figure 3 It is an assembly drawing of the collapsible loess collapsible characteristic test device.

[0018] Figure 4 It is the sectional view of the compression plate of the collapsible loess collapsibility characteristic test device.

[0019] 1, test bench; 2, support frame; 3, hydraulic machine; 4, compression plate; 5, storage cylinder; 6, net plate; 7, water receiving groove; 8, drain pipe; 9, flow hole; 10, positioning hole; 11, positioning rod; 12, water injection hole; 13, water storage tank; 14, limiting rod; 15, lifting plate; 16, plug rod; 17, screw rod; 18, water leakage hole. DETAILED DESCRIPTION

[0020] The utility model is further explained in connection with the drawings below.

[0021] According to Figures 1-4 The utility model provides a collapsible loess collapsibility characteristic test device: including test bench 1, test bench 1 is placed with storage cylinder 5, and loess is placed in storage cylinder 5;Storage cylinder 5 is transparent state material quality, and the outer wall of storage cylinder 5 is provided with scale, can conveniently test personnel's visual observation loess's volume change;Test bench 1 is fixedly connected with support frame 2, and support frame 2 is provided with hydraulic machine 3, and the working end of hydraulic machine 3 is fixedly connected with the compression plate 4 located in the upper of storage cylinder 5;

[0022] As Figure 4 Indicated, the water storage tank 13 is set up in compression plate 4, and the water injection hole 12 in communication with water storage tank 13 is set up on compression plate 4;Compression plate 4 bottom is provided with a plurality of water leakage holes 18 in communication with water storage tank 13, and water leakage holes 18 are evenly distributed and set up in the bottom of compression plate 4;The closed assembly is slidably arranged in water storage tank 13, and the position of the closed assembly corresponds to the position of water leakage hole 18;Test bench 1 is provided with water receiving groove 7, and net plate 6 is fixedly arranged in water receiving groove 7;Storage cylinder 5 is placed on net plate 6, and the flow hole 9 is set up in the bottom of storage cylinder 5. The side wall of test bench 1 is provided with drain pipe 8 in communication with water receiving groove 7, and the valve is set up on drain pipe 8. In the test, the excess moisture in storage cylinder 5 can flow out through flow hole 9, and is stored in water receiving groove 7 under the action of net plate 6, to avoid polluting test bench 1;At the same time, the valve of drain pipe 8 can be opened to guide the water in water receiving groove 7 out after a period of time.

[0023] As Figure 4As shown, the closed assembly includes a lifting plate 15 and a plug rod 16, the lifting plate 15 is arranged in the water storage tank 13 and slides up and down, and the plug rod 16 is fixedly connected below the lifting plate 15. The lifting plate 15 is attached to the bottom of the water storage tank 13, the bottom of the lifting plate 15 is provided with a sealing gasket, and the lifting plate 15 blocks all the water leakage holes 18, and the sealing gasket can increase the sealing performance of the lifting plate 15 to the water leakage hole 18; the plug rod 16 is inserted into the water leakage hole 18, and the number of the plug rod 16 is the same as that of the water leakage hole 18. The setting of the plug rod 16 can play the role of keeping the bottom of the pressing plate 4 flat, and when the pressing plate 4 exerts pressure on the loess, the loess will not enter the water leakage hole 18 due to the setting of the plug rod 16.

[0024] A screw rod 17 is rotatably connected in the pressing plate 4, and the lifting plate 15 is threadedly connected to the screw rod 17; a limiting rod 14 is fixedly arranged in the pressing plate 4, and the lifting plate 15 is slidably sleeved on the limiting rod 14. The limiting rod 14 can limit the rotation of the lifting plate 15, so as to convert the rotation of the screw rod 17 into the movement of the lifting plate 15, drive the lifting plate 15 to slide up and down, and facilitate adjustment.

[0025] As shown in the figure, Figure 3 The bottom of the storage cylinder 5 is provided with two positioning holes 10, and the mesh plate 6 is fixedly connected with a positioning rod 11 inserted into the positioning hole 10. By using the principle of two-point positioning, the storage cylinder 5 can be quickly positioned to ensure that the storage cylinder 5 is located directly below the hydraulic machine 3.

[0026] The principle of the utility model

[0027] As shown in the figure, Figure 3 When using the utility model, first, place loess in the storage cylinder 5, and then place the storage cylinder 5 on the mesh plate 6; insert the two positioning rods 11 into the positioning holes 10 to position the storage cylinder 5. Under the condition that the lifting plate 15 blocks the water leakage hole 18 and the plug rod 16 is inserted into the water leakage hole 18, start the hydraulic machine 3 to drive the pressing plate 4 to move downward, so that the pressing plate 4 exerts a certain pressure on the loess, and at this time, the volume of the loess is in the initial state, and then reset the hydraulic machine 3 and the pressing plate 4.

[0028] As shown in the figure, Figure 4As shown, water is added into the water storage tank 13 through the water injection hole 12, and the water cannot enter the storage cylinder 5 through the water leakage hole 18 due to the blocking effect of the lifting plate 15. The hydraulic machine 3 is started again to drive the pressing plate 4 to move downwards, so that the pressing plate 4 is close to the loess but does not apply pressure to the loess; the screw rod 17 is twisted to drive the lifting plate 15 to move upwards, so that the lifting plate 15 and the insertion rod 16 no longer block the water leakage hole 18, and at this time, the water in the water storage tank 13 can flow into the loess through the water leakage hole 18; since the water is close to the loess when flowing out, the impact of the water flow on the loess is greatly reduced, and the setting of multiple evenly distributed water leakage holes 18 can also make the water injection more uniform, thereby improving the accuracy of the test. After the water injection is completed, the screw rod 17 is reversed to make the insertion rod 16 reinserted into the water leakage hole 18, and the lifting plate 15 reblocks the water leakage hole 18, and the hydraulic machine 3 can be started to drive the pressing plate 4 to continue to apply pressure to the loess in the water permeated state downwards, and since the water leakage hole 18 is inserted by the insertion rod 16, the loess will not enter the pressing plate 4 from the water leakage hole 18 when the loess is pressed; the change of the loess volume is observed, so that the loess collapse characteristics can be judged.

[0029] The above describes the utility model and its implementation mode, which is not limited, and the embodiment shown in the drawings is only one of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A test device for the collapsibility characteristics of collapsible loess, comprising a test platform (1), a storage cylinder (5) placed on the test platform (1), and loess placed inside the storage cylinder (5); a support frame (2) is fixedly connected to the test platform (1), a hydraulic press (3) is installed inside the support frame (2), and a pressure plate (4) located directly above the storage cylinder (5) is fixedly connected to the working end of the hydraulic press (3); characterized in that: The pressure plate (4) has a water storage tank (13) and a water injection hole (12) communicating with the water storage tank (13) on the pressure plate (4); the bottom of the pressure plate (4) has a number of water leakage holes (18) communicating with the water storage tank (13) and the water leakage holes (18) are evenly distributed at the bottom of the pressure plate (4); a sealing component is slidably installed in the water storage tank (13) and the sealing component corresponds to the position of the water leakage hole (18); a water receiving tank (7) is installed in the test bench (1) and a mesh plate (6) is fixedly installed in the water receiving tank (7); the storage cylinder (5) is placed on the mesh plate (6) and a drainage hole (9) is installed at the bottom of the storage cylinder (5).

2. The test device for the collapsibility characteristics of collapsible loess according to claim 1, characterized in that: The enclosure assembly includes a lifting plate (15) and a plug rod (16). The lifting plate (15) is slidably disposed in the water storage tank (13), and the plug rod (16) is fixedly connected to the bottom of the lifting plate (15).

3. The test device for the collapsibility characteristics of collapsible loess according to claim 2, characterized in that: The lifting plate (15) is attached to the bottom of the water storage tank (13), and a sealing gasket is provided at the bottom of the lifting plate (15). The lifting plate (15) blocks all the water leakage holes (18). The insertion rod (16) is inserted into the water leakage hole (18), and the number of insertion rods (16) is the same as the number of water leakage holes (18).

4. The test device for the collapsibility characteristics of collapsible loess according to claim 3, characterized in that: The pressure plate (4) is rotatably connected to a screw (17), and the lifting plate (15) is threadedly connected to the screw (17); a limit rod (14) is fixedly installed inside the pressure plate (4), and the lifting plate (15) is slidably sleeved on the limit rod (14).

5. The test device for the collapsibility characteristics of collapsible loess according to claim 1, characterized in that: The storage cylinder (5) has two positioning holes (10) at its bottom, and a positioning rod (11) that is inserted into the positioning hole (10) is fixedly connected to the mesh plate (6).

6. The test device for the collapsibility characteristics of collapsible loess according to claim 1, characterized in that: The test bench (1) has a drain pipe (8) connected to the water tank (7) on its side wall, and a valve is provided on the drain pipe (8).

7. The test device for the collapsibility characteristics of collapsible loess according to claim 1, characterized in that: The storage cylinder (5) is made of transparent material, and the outer wall of the storage cylinder (5) is marked with graduations.

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