CN107340224A - A kind of green concrete osmotic coefficient investigating device - Google Patents

Abstract

The invention discloses a device for measuring the permeability coefficient of greening concrete, which comprises a square tube. An overflow port is vertically arranged on the outer wall of the square tube, and the overflow port communicates with the inside of the square tube; The lower pressure measuring hole, the upper pressure measuring hole is located above the lower pressure measuring hole, and the upper pressure measuring hole is located below the overflow; a pressure measuring tube is vertically connected to the upper pressure measuring hole, and a pressure measuring tube is also vertically connected to the lower pressure measuring hole. The pressure tube and the pressure measuring tube are parallel to the square tube; the square tube is equipped with a permeable partition, and the inner wall of the square tube is provided with a water seepage port, which is located under the permeable partition, and the outside of the seepage port is connected to a measuring cup through a rubber tube . The device has a simple structure and a simple operation process. The square cylinder structure makes the preparation of the green concrete test block more convenient before the test, and can meet the test and measurement requirements of the green concrete permeability coefficient, filling the instrument requirements for the green concrete permeability coefficient test. There is a gap in the market, suitable for promotion and use.

Description

A greening concrete permeability coefficient measuring device

technical field

The invention relates to the technical field of geotechnical tests, in particular to a device for measuring the permeability coefficient of greening concrete.

Background technique

Greening concrete (also known as plant-growing porous concrete) is an environmentally friendly concrete that can grow plants. Because the concrete has large pores, the holes provide the space needed for plant growth, and the vegetation planted on the green concrete surface can pass through the concrete through the holes and take root in the soil to grow.

The root system of the plants in the greening concrete penetrates the concrete and then penetrates into the soil of the embankment, so that the slope protection will not appear cracking, landslides, etc., and has the functions of stabilizing the slope and restoring the ecology. Planting different vegetation in concrete has different effects on slope protection and ecological restoration, and the water permeability of green concrete is an important basis for judging the above effects. By measuring the permeability coefficient of greening concrete, its water permeability can be quantitatively reflected. At present, there are the following problems in the determination of the permeability coefficient of greening concrete: (1) There is no special instrument for measuring the permeability coefficient of greening concrete on the market. (2) Existing commonly used permeameters, such as constant water head permeameters (type 70 permeameters), are only suitable for the determination of the permeability coefficient of sandy soil and non-cohesive soil containing a small amount of gravel, and are not suitable for greening concrete, which contains Material of larger coarse bone grains. (3) The structure of the traditional permeameter is mostly cylindrical, but it is difficult to prepare the green concrete into a circular shape, which makes the workload and difficulty of preparing the sample in the early stage larger.

Contents of the invention

The purpose of the present invention is to provide a test device for measuring the permeability coefficient of greening concrete in order to overcome the deficiencies in the prior art.

The invention provides a device for measuring permeability coefficient of greening concrete, which comprises a square tube, an overflow port is vertically arranged on the outer wall of the square tube, and the overflow port communicates with the inside of the square tube; the outer wall of the square tube is also vertically arranged There are an upper pressure measuring hole and a lower pressure measuring hole, the upper pressure measuring hole is located above the lower pressure measuring hole, and the upper pressure measuring hole is located below the overflow; a pressure measuring tube is vertically connected to the upper pressure measuring hole, and the A pressure measuring tube is also vertically connected to the pressure measuring hole described below, and the pressure measuring tube is parallel to the square cylinder; a water-permeable partition is arranged inside the square cylinder, and a water seepage port is arranged on the inner wall of the square cylinder. The water seepage opening is located under the water-permeable partition, and the outer side of the water seepage opening is connected with a measuring cup through a rubber tube.

Preferably, the overflow port is located 5 cm below the upper edge of the square tube, the overflow port has an inner diameter of 1 cm, and communicates with the square tube.

Preferably, the permeable partition is a porous structure, located 6 cm above the bottom of the square cylinder, and has a thickness of 1 cm.

Preferably, the diameter of the permeable holes on the permeable partition is 0.4 cm to 0.6 cm, and the distance between the permeable holes is 1.2 to 1.5 times the diameter of the holes.

Preferably, the inner diameters of the upper pressure measuring hole and the lower pressure measuring hole are both 1 cm, and the distance between the centers of the two pressure measuring holes is 10 cm.

Preferably, a copper wire mesh is provided at the connection between the upper pressure measuring hole, the lower pressure measuring hole and the square cylinder.

Preferably, the inner diameter of the pressure measuring tube is 0.6 cm, and the nozzle of the pressure measuring tube is at the same height as the upper end of the square tube.

Preferably, the seepage opening is tangent to the lower edge of the water-permeable partition, and the diameter of the seepage opening is 1 cm.

Preferably, a water stop clip is installed on the rubber tube.

Preferably, the capacity of the measuring cup is 800-1000ml.

The present invention measures the operating steps of greening concrete permeability coefficient as follows:

Step 1: Prepare the green concrete test block in advance into a square block with a side length of 10cm, and prepare a stopwatch at the same time;

Step 2: Close the water stop clip on the water seepage port 6, lead a rubber tube to fill the square cylinder 1 with water, so that the water level is slightly higher than the permeable partition 3;

Step 3: Slowly put the green concrete test block into the square tube 1 to the permeable partition 3 to avoid damage to the permeable partition 3;

Step 4: Seal the gap between the greening concrete test block and the wall of square tube 1 with glass glue, and place it in a ventilated environment to dry in the shade;

Step 5: Install the green concrete test block and require it to be 2 to 3 cm higher than the upper pressure measuring hole, and then adjust the water level to about 2 cm higher than the test block;

Step 6: Inject water from the rubber tube at the upper end of the square cylinder 1, so that the water is injected from the upper part until it is flush with the overflow hole 2, and the water inlet flow rate is adjusted to ensure that the test is at a constant water head;

Step 7: Check whether the water level of the pressure measuring tube 5 is flush with the overflow hole 2. If it is not even, it means that there are air bubbles in the pipe or air leakage in the equipment, and the water level needs to be adjusted until it is even;

Step 8: After the water level of the piezometric tube 5 is stabilized, measure the water levels of the two piezometric tubes 5 and calculate the water level difference between them;

Step 9: Start the stopwatch, use the measuring cup 7 to collect the amount of permeated water discharged from the seepage port 6 within the set time, and repeat once.

The concrete formula that the present invention calculates greening concrete permeability coefficient is:

Kt=QL/AHT

Among them: Kt is the permeability coefficient of the test block (cm/s) when the water temperature is t°C;

Q is the permeation water volume (cm3) in time t;

L is the height (cm) of the test block between the centers of the measuring pressure holes;

A is the cross-sectional area of the test block;

H is the water level difference (cm);

T is time (s).

Compared with prior art, the beneficial effect of the present invention has:

The device of the present invention has simple structure and convenient operation process, and the structure of the square cylinder body makes the preparation of the green concrete test block more convenient before the test, and can meet the test and measurement requirements of the green concrete permeability coefficient, filling the gap between the green concrete permeability coefficient test and the instrument There is a gap in the market for demand, and it is suitable for promotion and use.

Description of drawings

Fig. 1 is the overall structure schematic diagram provided by the present invention;

Fig. 2 is a schematic cross-sectional view of a water-permeable partition in the present invention.

Explanation of reference signs:

1. Square cylinder; 2. Overflow port; 3. Permeable partition; 4-1. Upper pressure measuring hole; 4-2. Lower pressure measuring hole; 5. Pressure measuring tube; 6. Water seepage port; 7. Measuring cup.

detailed description

A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

As shown in Figure 1-2, the embodiment of the present invention provides a device for measuring the permeability coefficient of greening concrete, including a square cylinder 1. Specifically, the square cylinder 1 is a square vessel with an open upper end and a sealed lower end, and the cylinder body is made of glass. , the net height is 40cm, the inner cross-sectional area length × width = 10.5cm × 10.5cm, the outer cross-sectional area length × width = 11.5cm × 11.5cm, the bottom of the cylinder is a square support of length × width × height = 13cm × 13cm × 2cm , the outer wall of the square tube 1 is vertically provided with an overflow port 2, and the overflow port 2 communicates with the inside of the square tube 1; an upper pressure measuring hole 4-1 and a lower pressure measuring hole 4-2 are vertically arranged on the outer wall of the square tube 1, The upper pressure measuring hole 4-1 is located above the lower pressure measuring hole 4-2, and the upper pressure measuring hole 4-1 is located below the overflow port 2; a pressure measuring tube 5 is vertically connected to the upper pressure measuring hole 4-1, and the lower measuring A pressure measuring tube 5 is also vertically connected to the pressure hole 4-2, and the pressure measuring tube 5 is parallel to the square tube 1; a water-permeable partition 3 is arranged inside the square tube 1, and a water seepage port 6 is arranged on the inner wall of the square tube 1 to allow water seepage The port 6 is located below the water-permeable partition 3 , and the outside of the water-permeable port 6 is connected with a measuring cup 7 through a rubber tube.

In the embodiment of the present invention, the overflow port 2 is located 5 cm below the upper edge of the square tube 1 , the inner diameter of the overflow port 2 is 1 cm, and it communicates with the square tube 1 . The overflow port is used for water overflow and to check whether the device is leaking during the permeability coefficient determination test. The permeable partition 3 has a porous structure and is located 6 cm above the bottom of the square tube 1 with a thickness of 1 cm. Permeable holes are evenly distributed on the permeable partition and its edge is sealed with the inner wall of the square tube 1 for placing green concrete test blocks. The diameter of the permeable holes on the permeable partition 3 is 0.4 cm to 0.6 cm, and the distance between the permeable holes is 1.2 to 1.5 times the diameter of the holes. The inner diameters of the upper pressure measuring hole 4-1 and the lower pressure measuring hole 4-2 are both 1 cm, and the distance between the centers of the two pressure measuring holes is 10 cm. Copper wire mesh is arranged at the junction of upper pressure measurement hole 4-1, lower pressure measurement hole 4-2 and square cylinder 1, and copper wire mesh can prevent large particles in water from entering or blocking the pressure measurement hole. The inner diameter of the pressure measuring tube 5 is 0.6 cm, and the mouth of the pressure measuring tube 5 is at the same height as the upper end of the square tube 1 . The seepage port 6 is tangent to the lower edge of the water-permeable partition 3, and the diameter of the seepage port 6 is 1 cm. A water stop clip is installed on the rubber tube, and the water stop clip is used to regulate the water volume in the device. The capacity of measuring cup 7 is 800～1000ml, because greening concrete seepage coefficient is big, so need to adopt the measuring cup of large size to be used for containing the infiltration amount that seepage outlet 6 discharges.

The present invention measures the operating steps of greening concrete permeability coefficient as follows:

Step 1: Prepare the green concrete test block in advance into a square block with a side length of 10cm, and prepare a stopwatch at the same time;

Step 2: Close the water stop clip on the water seepage port 6, lead a rubber tube to fill the square cylinder 1 with water, so that the water level is slightly higher than the permeable partition 3;

Step 3: Slowly put the green concrete test block into the square tube 1 to the permeable partition 3 to avoid damage to the permeable partition 3;

Step 4: Seal the gap between the green concrete test block and the wall of square tube 1 with glass glue, and place it in a ventilated environment to dry in the shade;

Step 5: Install the green concrete test block and require it to be 2 to 3 cm higher than the upper pressure measuring hole, and then adjust the water level to about 2 cm higher than the test block;

Step 6: Inject water from the rubber tube at the upper end of the square cylinder 1, so that the water is injected from the upper part until it is flush with the overflow hole 2, and the water inlet flow rate is adjusted to ensure that the test is at a constant water head;

Step 7: Check whether the water level of the pressure measuring tube 5 is flush with the overflow hole 2. If it is not even, it means that there are air bubbles in the pipe or air leakage in the equipment, and the water level needs to be adjusted until it is even;

Step 8: After the water level of the piezometric tube 5 is stabilized, measure the water levels of the two piezometric tubes 5 and calculate the water level difference between them;

Step 9: Start the stopwatch, use the measuring cup 7 to collect the amount of permeated water discharged from the seepage port 6 within the set time, and repeat once;

The concrete formula that the present invention calculates greening concrete permeability coefficient is:

K _t =QL/AHT

Among them: K _t is the permeability coefficient of the test block when the water temperature is t°C (cm/s); Q is the amount of permeated water within the time t (cm ³ ); L is the height of the test block between the centers of the pressure holes (cm); A is the cross-sectional area of the test block; H is the water level difference (cm); T is the time (s).

Specific examples:

Gathered the afforestation concrete of the Miluo River Xinshi section in Yueyang City, a kind of afforestation concrete permeability coefficient measuring device of the present invention has been tested and tested, and the operation steps and results are as follows:

Step 1: Prepare two square green concrete test blocks with a side length of 10cm, and prepare a stopwatch at the same time.

Step 2: Close the water stop clamp on the rubber tube of the water seepage port 6, and lead the rubber tube to fill the square cylinder 1 with water so that the water level is slightly higher than the permeable partition 3.

Step 3: Slowly put the green concrete test block into the square tube 1 to the permeable partition 3 to avoid damage to the permeable partition 3.

Step 4: Seal the gap between the greening concrete test block and the wall of square tube 1 with glass glue, and place it in a ventilated environment to dry in the shade.

Step 5: Put in the green concrete test block and require it to be 2-3cm higher than the upper pressure measuring hole, and then adjust the water level to about 2cm higher than the test block.

Step 6: Begin water injection from the rubber tube at the upper end of the square cylinder 1, so that the water is injected from the upper part until it is flush with the overflow hole 2, and the water inlet flow rate is adjusted to ensure that the test is at a constant water head.

Step 7: Check whether the water level of the pressure measuring tube 5 is flush with the overflow hole 2.

Step 8: After the water level of the piezometric tube 5 is stabilized, measure the water levels of the two piezometric tubes 5 and calculate the water level difference between them.

Step 9: Start the stopwatch, use the measuring cup 7 to collect the amount of permeated water discharged from the seepage port 6 within the set time, and repeat once.

The test results are calculated according to the following formula:

K _t =QL/AHT

Among them: K _t is the permeability coefficient of the test block when the water temperature is t°C (cm/s); Q is the amount of permeated water within the time t (cm ³ ); L is the height of the test block between the centers of the pressure holes (cm); A is the cross-sectional area of the test block; H is the water level difference (cm); T is the time (s).

The calculation results of the above examples are shown in Table 1.

Table 1 Calculation table of permeability coefficient

To sum up, the device for measuring the permeability coefficient of greening concrete provided by the embodiment of the present invention has a simple structure and a simple operation process. The requirement for the test and determination of the permeability coefficient fills the gap in the market for the instrument demand for the test of the permeability coefficient of greening concrete, and is suitable for popularization and use.

The above disclosures are only a few specific embodiments of the present invention, however, the embodiments of the present invention are not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (10)

1. a greening concrete permeability coefficient measuring device, is characterized in that, comprises square cylinder (1), and the outer wall of described square cylinder (1) is vertically provided with overflow (2), and described overflow (2) and square The cylinder (1) is internally connected; An upper pressure measuring hole (4-1) and a lower pressure measuring hole (4-2) are vertically arranged on the outer wall of the square tube (1), and the upper pressure measuring hole (4-1) is located at the lower pressure measuring hole (4-2), the upper pressure measuring hole (4-1) is located below the overflow (2); the upper pressure measuring hole (4-1) is vertically connected with a pressure measuring tube (5), the A pressure measuring tube (5) is also vertically connected to the lower pressure measuring hole (4-2), and the pressure measuring tube (5) is parallel to the square cylinder (1); The square tube (1) is provided with a water-permeable partition (3), and the inner wall of the square tube (1) is provided with a water seepage port (6), and the water seepage port (6) is located at the end of the water-permeable partition (3). Below, the outside of this seepage port (6) is connected with measuring cup (7) by rubber tube. 2. greening concrete permeability measuring device as claimed in claim 1, is characterized in that, described overflow (2) is positioned at square tube (1) upper edge 5cm place below, and the internal diameter of this overflow (2) is 1cm, And communicate with the square tube (1). 3. The greening concrete permeability coefficient measuring device according to claim 1, characterized in that, the permeable partition (3) is a porous structure, positioned at 6 cm above the bottom of the square tube (1), and has a thickness of 1 cm. 4. The greening concrete permeability coefficient measuring device as claimed in claim 3, characterized in that, the diameter of the permeable holes on the permeable partition (3) is 0.4cm～0.6cm, and the spacing between the permeable holes is 1.2 of the hole diameter. ~1.5 times. 5. the greening concrete permeability coefficient measuring device as claimed in claim 1, is characterized in that, the inner diameter of described upper pressure measuring hole (4-1) and lower pressure measuring hole (4-2) is 1cm, and two measure The distance between the centers of the pressure holes is 10 cm. 6. the greening concrete permeability coefficient measuring device as claimed in claim 1, is characterized in that, described upper pressure measuring hole (4-1), lower pressure measuring hole (4-2) and square tube (1) junction are set With copper wire mesh. 7. greening concrete permeability coefficient measuring device as claimed in claim 1, is characterized in that, the internal diameter of described piezometric tube (5) is 0.6cm, and the mouth of mouth of this piezometric tube (5) and square tube (1) The upper end is equal in height. 8. The greening concrete permeability coefficient measuring device as claimed in claim 1, characterized in that, the seepage port (6) is tangent to the lower edge of the water-permeable partition (3), and the diameter of the seepage port (6) is 1cm. 9. The device for measuring permeability coefficient of greening concrete according to claim 1, characterized in that a water-stop clip is installed on the rubber tube. 10. The greening concrete permeability coefficient measuring device according to claim 1, characterized in that the capacity of the measuring cup (7) is 800-1000ml.