High-precision in-situ density testing device adopting irrigation method

Abstract

The utility model relates to a high-precision irrigation method in-situ density testing device, which is arranged on a foundation pit, a testing pit is formed on the foundation pit, and the testing device comprises a support arranged on the surface of the foundation pit, a plurality of pressure sensors arranged on the support, the water storage barrel is fixedly mounted at the top of the bracket; the water storage barrel is arranged in the test pit, the water containing bag is arranged in the test pit, a water conveying pipe is connected between the water containing bag and the water storage barrel, an electronic flow meter is arranged on the water conveying pipe, the influence of uncertainty of manual reading on a result is avoided through reading of the electronic flow meter, and the measurement result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of highway engineering survey devices, and particularly refers to a high-precision in-situ density test device by the water injection method. Background Art

[0002] The main purpose of the in-situ density test is to measure the density of in-situ soil and control the construction quality of the filled embankment project. The in-situ density test mainly measures the density values of the soil, backfill materials or other materials at the sampling points in the original position on-site to evaluate the backfill quality of the filled embankment project. According to the test regulations (GB / T 50123-2019 Standard for Geotechnical Test Methods), the existing main test methods for in-situ density include the core cutter method, the sand replacement method, the water injection method, etc. Among them, the core cutter method is applicable to fine-grained soil; the sand replacement method and the water injection method are applicable to fine-grained soil, sandy soil and gravelly soil.

[0003] As a commonly used in-situ density measurement method at the construction site, the water injection method has the following disadvantages in the use process: in the existing in-situ density test process by the water injection method, the reading of the water level drop in the water bucket is usually carried out manually, which is easily affected by the subjective factors of the experimenter, resulting in inaccurate test results; and during the test process, the plastic film and the pit hole cannot be well and tightly fitted, which will also cause large test errors. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a high-precision in-situ density test device by the water injection method. By using the reading of the electronic flowmeter, the influence of the uncertainty of manual reading on the result is avoided, making the measurement result more accurate.

[0005] The technical solution to achieve the above purpose is a high-precision in-situ density test device by the water injection method, which is arranged on a foundation pit. A test pit is formed on the foundation pit. The test device includes:

[0006] A bracket arranged on the surface of the foundation pit;

[0007] A water storage bucket fixedly installed on the top of the bracket; and

[0008] A water storage bag arranged in the test pit. A water delivery pipe is connected between the water storage bag and the water storage bucket, and an electronic flowmeter is arranged on the water delivery pipe.

[0009] Further, an air pump is arranged on the top of the water storage bucket, and an air delivery pipe is arranged between the air pump and the water storage bucket.

[0010] Further, a stop valve is arranged on the water delivery pipe.

[0011] Further, scale lines are arranged on the water storage bucket.

[0012] Further, a water bag sealing device is provided between the water storage bag and the water delivery pipe.

[0013] Further, the water bag sealing device includes:

[0014] A water storage ring, a first threaded port is formed at the top of the water storage ring corresponding to the water delivery pipe, and a second threaded port is formed at the bottom of the water storage ring corresponding to the first threaded port;

[0015] A water stop gate disposed in the water storage ring and corresponding to the second threaded port, controlling the water stop gate to close or open the second threaded port; and

[0016] An exhaust hole disposed at the top of the water storage ring.

[0017] Further, a first threaded connection end is formed at the water delivery pipe corresponding to the first threaded port, and the first threaded connection end is threadedly connected to the first threaded port;

[0018] A second threaded connection end is formed at the water storage bag corresponding to the second threaded port, and the second threaded connection end is threadedly connected to the second threaded port.

[0019] Further, the water storage bag is made of a rubber film.

[0020] Further, a dust-proof substrate is provided on the foundation pit, a plurality of observation holes are formed on the dust-proof substrate, and the dust-proof substrate covers the test pit.

[0021] Further, a counterweight is provided on the top of the dust-proof substrate.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] By controlling the air pump at the top of the water storage bucket to control the flow rate of water through the water delivery pipe, it is ensured that the water storage bag can cover and fill the hole, and the volume of the hole can be more accurately feedback; the influence of the uncertainty of manual reading on the result is avoided by the reading of the electronic flow meter, making the measurement result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall structure diagram of a high-precision in-situ density test device by the water filling method.

[0025] Figure 2 For Figure 1 The structural schematic diagram at A in

[0026] Legend: 1. Water storage bucket; 11. Air pump; 12. Water delivery pipe; 13. Water stop valve; 2. Electronic flow meter; 3. Bracket; 4. Dust-proof substrate; 5. Water bag sealing device; 6. Foundation pit; 7. Water storage bag; 8. Counterweight. Detailed implementation mode

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Refer to Figure 1 , a high-precision in-situ density testing device by the water injection method, which is arranged on the foundation pit 6. A test pit is formed on the foundation pit 6. The test device includes: a bracket 3, a water storage bucket 1 and a water-filled bag 7. The bracket 3 is arranged on the surface of the foundation pit 6; the water storage bucket 1 is fixedly installed on the top of the bracket 3; and the water-filled bag 7 is arranged in the test pit. A water delivery pipe 12 is connected between the water-filled bag 7 and the water storage bucket 1, and an electronic flowmeter 2 is arranged on the water delivery pipe 12.

[0029] In the present utility model, a preferred implementation mode is as follows: Select an appropriate test area on the foundation pit 6, excavate a test pit, put the soil sample in the pit into a soil container, weigh the sample mass M, and take a representative sample to measure the moisture content ω; Dig the test pit size according to the maximum particle size of the sample; Set the bracket 3 and the water storage bucket 1 at the position of the test pit, set the water delivery pipe 12 at the bottom of the water storage bucket 1, and an electronic flowmeter 2 is arranged on the water delivery pipe 12. Fix the water-filled bag 7 to the water delivery pipe 12 and place the water-filled bag 7 in the test pit. Add water to the water storage bucket 1 and check the expansion of the water-filled bag 7. When the water-filled bag 7 is completely filled with the test pit, record the value of the electronic flowmeter 2, which is the volume V2 of the test pit (excluding the water-filled bag 7). The volume of the water-filled bag 7 is V1, then the volume of the test pit is V = V1 + V2. Calculate the wet density and dry density of the material and conduct two parallel measurements, and take the arithmetic mean:

[0030] Wet density ρs:

[0031] Dry density ρd:

[0032] Furthermore, the size of the dug test pit is determined according to the maximum particle size of the sample. Specifically, refer to Table 1 below:

[0033]

[0034] Table 1

[0035] Furthermore, the bracket 3 is a triangular bracket 3.

[0036] Furthermore, a hollow bracket plate is provided on the triangular bracket 3, and the water storage bucket 1 is fixed on the bracket plate. A rubber sealing ring cover plate is installed on the top of the water storage bucket 1, and a reserved air injection hole is provided to connect an electric air pump 11.

[0037] Further, an air pump 11 is provided at the top of the water storage bucket 1, and an air charging pipe is provided between the air pump 11 and the water storage bucket 1. Preferably, the air pump 11 is used to pressurize the water storage bucket 1 to control the flow rate and water pressure of the water storage bucket 1 for delivering water to the water delivery pipe 12, so as to avoid, due to the material reason of the water bag 7 during use, that after the water is injected for a certain period of time, the water bag 7 cannot continue to expand due to insufficient water injection pressure, and the water bag 7 cannot fully fit on the side wall of the test pit, resulting in incorrect test data.

[0038] Further, a water stop valve 13 is provided on the water delivery pipe 12. By turning on or off the water stop valve 13, the water delivery pipe 12 can be controlled to start or stop delivering water to the water bag 7.

[0039] Further, scale lines are provided on the water storage bucket 1. Through these scale lines, the drop of the water level in the water storage bucket 1 can be viewed, so as to observe the volume of the liquid that has been injected.

[0040] Refer to Figure 2 Furthermore, a water bag sealing device 5 is provided between the water bag 7 and the water delivery pipe 12.

[0041] Further, the water bag sealing device 5 includes: a water storage ring, a water stop gate, and an exhaust hole. A first threaded port corresponding to the water delivery pipe 12 is formed at the top of the water storage ring, and a second threaded port corresponding to the first threaded port is formed at the bottom of the water storage ring; the water stop gate is arranged in the water storage ring and corresponds to the second threaded port, and the second threaded port is closed or opened by controlling the water stop gate; and the exhaust hole is arranged at the top of the water storage ring.

[0042] In the present utility model, a preferred implementation manner is: before injecting water flow into the water bag 7, first close the water stop gate, open the water stop valve 13 located above the water storage ring, so that the water flow is injected into the water storage ring. When the water flow continuously flows out of the exhaust hole, close the exhaust hole. Preferably, the exhaust hole can be blocked by using a plug or fixedly arranging a blocking piece at the top of the exhaust hole, reset the reading of the electronic flow meter 2 to zero, and open the water stop gate, so that the water flow flows into the water bag 7 through the second threaded port, and subsequent measurement work is carried out.

[0043] Further, the water delivery pipe 12 forms a first threaded connection end corresponding to the first threaded port, and the first threaded connection end is threadedly connected to the first threaded port;

[0044] The water bag 7 forms a second threaded connection end corresponding to the second threaded port, and the second threaded connection end is threadedly connected to the second threaded port.

[0045] Further, the water storage bag 7 is made of a rubber film. The water storage bag 7 made of the rubber film has good tensile strength to ensure that the water storage bag 7 can completely adhere to the pit wall of the test pit, reducing the error between the volume of water poured into the hole and the actual volume of the pit.

[0046] Further, a dust-proof substrate 4 is provided on the foundation pit 6. A plurality of observation holes are formed on the dust-proof substrate 4, and the dust-proof substrate 4 covers the test pit. Preferably, the lower surface of the dust-proof substrate 4 is flush with the surface of the foundation pit 6. By covering the test pit with the dust-proof substrate 4, it is ensured that the height of the water storage bag 7 is flush with the surface of the foundation pit 6. When the water storage bag 7 is filled with water, the height of the water storage bag 7 is flush with the height of the test pit, and the dust-proof base abuts against the surface of the water storage bag 7, thereby preventing the water storage bag 7 from continuing to expand in the vertical direction. After continuing to fill the water storage bag 7 with water, the water storage bag 7 expands along the horizontal direction of the test pit to fit against the side wall of the test pit, making the measurement result more accurate.

[0047] Still further, the dust-proof substrate 4 is formed with a through hole corresponding to the water delivery pipe 12, and the water delivery hole passes through the through hole and is placed in the test pit. The size of the dust-proof substrate 4 is larger than the size of the mouth of the test pit.

[0048] Further, a counterweight 8 is provided on the top of the dust-proof substrate 4. The counterweight 8 can prevent the dust-proof substrate 4 from being lifted by the expanding water storage bag 7 during use, making the measurement result more accurate.

[0049] Still further, the size of the counterweight 8 is smaller than the size of the mouth of the test pit.

[0050] The following describes the use process of a high-precision in-situ density test device using the water injection method of the present invention.

[0051] 1. Select a suitable test position on the foundation pit 6. The size of the test pit should be determined according to the provisions of Table 1. Draw the outline of the pit mouth according to the determined test pit diameter, and dig down to the required depth within the outline. Put the sample in the pit into the soil container, weigh the sample mass M, and take a representative sample to measure the moisture content ω;

[0052] 2. After the test pit is dug, place the dust-proof substrate 4, and put the water storage bag 7 and the water bag sealing device 5 into the test pit and lean them against the dust-proof substrate 4.

[0053] 3. Set up the triangular support 3 and the water storage bucket 1, fill them with water, cover them with a sealing rubber cover, and connect the air pump 11, the water delivery pipe 12, and the electronic flowmeter 2. Screw the bottom screw of the water delivery pipe 12 tightly to the water bag sealing screw, and slowly place the counterweight 8 on the substrate and press it firmly.

[0054] 4. Before the test starts, close the water stop gate, open the water stop valve 13 of the water delivery pipe 12, and open the exhaust hole. When water continuously flows out of the exhaust hole, close the exhaust hole.

[0055] 5. Turn on the electronic flowmeter 2 and zero it. Then open the water stop gate to let water flow into the water storage bag 7 of the rubber film. At the same time, turn on the air inflation pump 11 to increase the water pressure by inflating the water storage bucket 1.

[0056] 6. Observe through the observation hole on the substrate whether the water storage bag 7 of the rubber film is pressing against the dust-proof substrate 4 to determine that the water bag completely fills the test pit. At this time, record the value of the electronic flowmeter 2, which is the volume V2 of the test pit (excluding the water storage bag 7). The volume of the rubber film water storage bag 7 is V1, then the volume of the test pit is V = V1 + V2.

[0057] 7. Calculate the wet density and dry density of the material and conduct two parallel determinations, and take the arithmetic mean:

[0058] Wet density ρs:

[0059] Dry density ρd:

[0060] The above has described the present utility model in detail in conjunction with the embodiments of the drawings. Those of ordinary skill in the art can make various variations to the present utility model according to the above description. Therefore, certain details in the embodiments should not constitute a limitation to the present utility model, and the protection scope of the present utility model will be defined by the scope defined in the appended claims.

Claims

1. A high-precision water-filling method in-situ density testing device, arranged on a foundation pit, wherein a test pit is formed on the foundation pit, wherein: The testing device comprises: A support provided on the surface of the foundation pit; a water storage bucket fixedly mounted on the top of the bracket; and A water bag is arranged in the test pit, a water pipe is connected between the water bag and the water storage bucket, and an electronic flow meter is arranged on the water pipe.

2. The high-precision water-irrigation method in-situ density testing device according to claim 1 is characterized by: An air pump is arranged on the top of the water storage barrel, and an air filling pipe is arranged between the air pump and the water storage barrel.

3. The high-precision water-irrigation method in-situ density testing device according to claim 1 is characterized by: A water stop valve is arranged on the water delivery pipe.

4. The high-precision water-filling method in-situ density testing device according to claim 1 is characterized by: The water storage barrel is provided with scale lines.

5. The high-precision water-irrigation method in-situ density testing device according to claim 1 is characterized by: A water bag sealing device is arranged between the water bag and the water delivery pipe.

6. The high-precision water-irrigation method in-situ density testing device according to claim 5 is characterized by: The water bag sealing device comprises: A water storage ring, wherein a first threaded opening is formed at the top of the water storage ring corresponding to the water delivery pipe, and a second threaded opening is formed at the bottom of the water storage ring corresponding to the first threaded opening; a water stop gate provided in the water storage ring and corresponding to the second threaded opening, the second threaded opening being closed or opened by controlling the water stop gate; and An exhaust hole is arranged on the top of the water storage circle.

7. The high-precision water-irrigation method in-situ density testing device according to claim 6 is characterized by: The water delivery pipe is formed with a first threaded connection end corresponding to the first threaded opening, and the first threaded connection end is threadedly connected to the first threaded opening; The water bag is formed with a second threaded connection end corresponding to the second threaded opening, and the second threaded connection end is threadedly connected to the second threaded opening.

8. The high-precision water-filling method in-situ density testing device according to claim 1 is characterized by: The water bag is made of a rubber film.

9. The high-precision water-filling method in-situ density testing device according to claim 1 is characterized by: A dustproof substrate is arranged on the foundation pit, a plurality of observation holes are formed on the dustproof substrate, and the dustproof substrate covers the test pit.

10. The high-precision water-filling method in-situ density testing device according to claim 9, characterized in that: A counterweight block is arranged on the top of the dustproof substrate.

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