CN212340947U

CN212340947U - Steel slag concrete permeability measuring device

Info

Publication number: CN212340947U
Application number: CN202020759122.XU
Authority: CN
Inventors: 吴朝国; 谢文剑; 郑世闻; 程熙媛; 李威彤; 陈徐东
Original assignee: Kelier Environmental Protection Technology Co ltd
Current assignee: Kelier Environmental Protection Technology Co ltd
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2021-01-12
Anticipated expiration: 2030-05-09

Abstract

The utility model discloses a slag concrete permeability survey device, including first PVC pipe and second PVC pipe, first PVC pipe pass through the connector in proper order with ball valve and third PVC union coupling, the both ends of second PVC pipe are respectively through connector and flowmeter and third PVC union coupling, the flowmeter is connected with the water pump, the water pump is connected with the water tank, the water tank is located the cushion cap, the cushion cap is formed by equilateral angle steel welding, place the test piece in third PVC is intraductal, the top of second PVC pipe is equipped with the bleed valve, install pressure sensor at the both ends of third PVC pipe test piece, pressure sensor and digital differential pressure gauge signal connection. The utility model provides a slag concrete permeability survey device, measuring error is little, the precision is high, and test piece installation, dismantlement process are simple swift.

Description

Steel slag concrete permeability measuring device

Technical Field

The utility model relates to a slag concrete permeability survey device belongs to concrete capability test technical field.

Background

As a complex porous medium material, the permeability of concrete is an important index for evaluating the performance of concrete. The stable flow method calculates the permeability coefficient by measuring the pressure difference and the seepage amount after stable seepage, and is a common concrete permeability test method based on the principle of reliability and clarity.

However, the existing concrete permeability measuring device and method by the stable flow method are not complete enough. In the prior art, people realize that the water pressure of a concrete permeability measuring device can be adjusted through an air compressor and a pressure regulator, but still need to supplement water periodically manually, and the operation is complex; even if automatic water feeding is realized by the related art, if air bubbles in small pores inside concrete cannot be completely eliminated, a large measurement error is generated.

SUMMERY OF THE UTILITY MODEL

The purpose is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides a slag concrete permeability survey device has solved the problem that current concrete permeability survey device operation is complicated, measuring error is big.

The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:

a steel slag concrete permeability determination device comprises a first PVC pipe and a second PVC pipe, wherein the first PVC pipe is sequentially connected with a ball valve and a third PVC pipe through a connector, two ends of the second PVC pipe are respectively connected with a flowmeter and the third PVC pipe through connectors, the flowmeter is connected with a water pump, the water pump is connected with a water tank, a test piece is placed in the third PVC pipe, a vent valve is arranged at the top of the second PVC pipe, pressure sensors are mounted at two ends of the test piece of the third PVC pipe, and the pressure sensors are in signal connection with a digital differential pressure gauge; the upper portion of third PVC pipe is equipped with the shoulder hole, is equipped with the internal thread in the shoulder hole, installs the sealing plug on the shoulder hole, and the test piece wraps up in outward has the plastic wrap, and the sealing plug cover is installed a compression sleeve on the internal thread of shoulder hole on the test piece that the parcel has the plastic wrap, cramps the sealing plug on the test piece through a compression sleeve.

Preferably, the first PVC pipe includes a fixing pipe and an adjusting pipe, the adjusting pipe is inserted into the fixing pipe, and the fixing pipe seals the adjusting pipe by a sealing device.

Preferably, the sealing device comprises a sealing nut and a sealing washer, an external thread is arranged at the end of the fixed pipe, a plurality of notches are arranged at the end of the fixed pipe, the sealing washer is positioned in the notches, and the sealing nut is screwed on the external thread to press the sealing washer positioned on the inner wall of the fixed pipe, so that the adjusting pipe is fixed and sealed.

Preferably, the bottom of the test piece is positioned on the adjusting ring.

Preferably, a spring is installed between the adjusting ring and the test piece.

Has the advantages that: the utility model provides a concrete permeability survey device provides constant flow and osmotic pressure through the automatic pump water mechanism of intaking, measures pressure differential and infiltration volume with digital differential pressure gauge and flowmeter respectively, has simplified the operation process of stable flow method to the measuring accuracy has been improved. Through the effect of sealing plug, compression cylinder and plastic wrap, effectively avoided the problem that flows through between test piece and the test piece sleeve lateral wall because of the water that the concrete test piece shape is irregular leads to. The gas in the test piece gap and the device is discharged through the ball valve and the air release valve, the first PVC pipe is designed into an adjustable structure, the water outlet end is adjusted slightly higher than the top of the test piece according to the length of the test piece, bubbles are prevented from entering the area below the test piece, and stable flow and measurable pressure gradient are kept. To sum up, the utility model provides a concrete permeability survey device, the measuring result error is little, the precision is high, and the installation of concrete sample, dismantlement process are simple swift moreover.

Drawings

Fig. 1 is a schematic structural view of the device for measuring concrete permeability of the present invention.

FIG. 2 is a schematic view of the internal structure of a first PVC pipe.

FIG. 3 is a schematic view of the internal structure of a third PVC pipe.

Fig. 4 is a schematic view of the end structure of the fixed pipe.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 4, a steel slag concrete permeability measuring device comprises a first PVC pipe 1 and a second PVC pipe, wherein the first PVC pipe 1 is sequentially connected with a ball valve 2 and a third PVC pipe 3 through a connector, two ends of the second PVC pipe are respectively connected with a flow meter 5 and the third PVC pipe 3 through connectors, the flow meter 5 is connected with a water pump 8, the water pump 8 is connected with a water tank, the water tank is positioned on a bearing platform, the bearing platform is formed by welding equal angle steel, a test piece 9 is placed in the third PVC pipe 3, a vent valve 14 is arranged at the top of the second PVC pipe, pressure sensors 12 are mounted at two ends of the test piece 9 of the third PVC pipe 3, and the pressure sensors 12 are in signal connection with a digital differential pressure meter 13; the upper portion of third PVC pipe 3 is equipped with the shoulder hole, is equipped with the internal thread in the shoulder hole, installs sealing plug 7 on the shoulder hole, and test piece 9 wraps up in the plastic wrap outward, and sealing plug 7 cover is installed compressing tightly section of thick bamboo 6 on the internal thread of shoulder hole on the test piece 9 that the parcel has the plastic wrap, cramps sealing plug 7 on test piece 9 through compressing tightly section of thick bamboo 6. The lower end of the inner wall of the pressing cylinder is provided with an inclined plane, and the sealing plug is pressed through the inclined plane, so that the sealing plug is further pressed on the test piece.

In the present invention, the first PVC pipe 1 includes a fixing pipe 31 and an adjusting pipe 33, the adjusting pipe 33 is inserted into the fixing pipe 31, and the fixing pipe seals the adjusting pipe 33 by a sealing device. The sealing device comprises a sealing nut 34 and a sealing washer 32, an external thread is arranged at the end part of the fixed pipe 31, a plurality of gaps 35 are arranged at the end part of the fixed pipe, the sealing washer 32 is positioned in the gaps 35, the sealing nut 34 is screwed on the external thread to press the sealing washer 32 positioned on the inner wall of the fixed pipe 31, and therefore the adjusting pipe 33 is fixed and sealed.

The utility model discloses in, test piece 9 bottom is located the adjusting ring, install the spring between adjusting ring and the test piece 9. By the adjusting ring and the spring, the test piece 9 with various lengths can be applied, so that the length of the test piece 9 does not need to be adjusted according to the length of the PVC pipe.

The measuring method of the steel slag concrete permeability measuring device comprises the following steps,

(1) connecting all the components, and connecting the pressure sensors above and below the test piece 9 to the digital differential pressure gauge by using a lead;

(2) closing the ball valve 2, opening the water pump 8, opening the air release valve after the water flow is filled in the second PVC pipe and the third PVC pipe 3, opening the air release valve when the air release valve stably discharges water and no air bubbles escape from the air release valve, namely after the air in the pipe is completely removed, opening the ball valve 2, and simultaneously filling water into the pipe from one end of the first PVC pipe 1 to ensure that the first PVC pipe 1 is filled with the water flow until the water flow overflows from the water outlet end of the first PVC pipe 1, and closing the air release valve after the first PVC pipe 1 stably discharges water and no air bubbles escape, namely the air in the whole device is completely removed, and starting a permeability test experiment;

(3) the water flow is adjusted to 1.2 multiplied by 10 by adjusting the power of the water pump 8^-4m³The flow rate is kept for a period of time, after the flow rate is stabilized, the water head difference between the upper part and the lower part of the test piece 9 is recorded by a digital differential pressure meter, and then the water head difference is 1.4 multiplied by 10^-5m³The flow rate is reduced successively at the interval of/s, and the head difference of each time is recorded until the flow rate is reduced to 2.2 x 10^-5m³And/s, after the final measurement is finished, closing the water pump 8, emptying the residual liquid in the device, and finally taking out the test piece 9 from the device;

according to Darcy's permeability law, linear fitting is carried out on flow and pressure difference data to obtain slope k, and the slope k is substituted into a formula

And (5) calculating the permeability coefficient K, wherein A is the area of the concrete sample 9, and L is the height of the concrete sample 9.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a slag concrete permeability survey device which characterized in that: the device comprises a first PVC pipe and a second PVC pipe, wherein the first PVC pipe is sequentially connected with a ball valve and a third PVC pipe through a connector, two ends of the second PVC pipe are respectively connected with a flowmeter and a water pump through connectors, the water pump is connected with a water tank, the water tank is positioned on a bearing platform, the bearing platform is formed by welding equilateral angle steel, a test piece is placed in the third PVC pipe, the top of the second PVC pipe is provided with a gas release valve, two ends of the test piece of the third PVC pipe are provided with pressure sensors, and the pressure sensors are in signal connection with a digital differential pressure meter; the upper portion of third PVC pipe is equipped with the shoulder hole, is equipped with the internal thread in the shoulder hole, installs the sealing plug on the shoulder hole, and the test piece wraps up in outward has the plastic wrap, and the sealing plug cover is installed a compression sleeve on the internal thread of shoulder hole on the test piece that the parcel has the plastic wrap, and the tip is equipped with the inclined plane under the inner wall of compression sleeve, presses the sealing plug through this inclined plane to further compress tightly the sealing plug on the test piece.

2. The apparatus for measuring permeability of steel slag concrete according to claim 1, characterized in that: the first PVC pipe comprises a fixed pipe and an adjusting pipe, the adjusting pipe is inserted into the fixed pipe, and the fixed pipe seals the adjusting pipe through a sealing device.

3. The apparatus for measuring permeability of steel slag concrete according to claim 2, characterized in that: the sealing device comprises a sealing nut and a sealing washer, an external thread is arranged at the end part of the fixed pipe, a plurality of notches are arranged at the end part of the fixed pipe, the sealing washer is positioned in the notches, and the sealing nut is screwed on the external thread to tightly press the sealing washer positioned on the inner wall of the fixed pipe, so that the adjusting pipe is fixed and sealed.

4. The apparatus for measuring permeability of steel slag concrete according to claim 1, characterized in that: the bottom of the test piece is positioned on the adjusting ring.

5. The apparatus for measuring permeability of steel slag concrete according to claim 4, characterized in that: and a spring is arranged between the adjusting ring and the test piece.