CN205301106U - Test instrument is compared to indoor bearing weight of - Google Patents

Abstract

The utility model discloses an indoor bearing ratio tester, which comprises a base, a test tube and a bracket are arranged on the base, a penetrating rod is arranged above the test tube, a first cross bar is arranged on the penetrating rod, the first cross bar The penetrating rod is arranged perpendicular to the penetrating rod, and the penetrating rod is connected with the test cylinder through a vertical adjustment mechanism, and a first level is arranged on the first horizontal bar; the vertical adjustment mechanism is adjusted to center the air bubbles of the first level. The tester of the utility model makes the penetrating rod in a vertical state by adjusting the vertical adjustment mechanism, thereby avoiding the local stress on the penetrating rod and uneven penetration depth of the penetrating rod, and reducing the measurement result and the actual penetration amount error.

Description

An indoor bearing ratio tester

technical field

The utility model belongs to the field of material testing instruments, in particular to an indoor bearing ratio testing instrument.

Background technique

CBR (California bearing gratio) is a test method proposed by the state of California to evaluate the bearing capacity of base materials. The bearing capacity is characterized by the ability of the material to resist local load compression deformation, and the bearing capacity of high-quality standard gravel is used as the standard, and the CBR value is expressed as a percentage of the relative value. This method was later also used to assess the strength of soil foundations. Due to the simple test method and low equipment cost of CBR, it has been widely used in many countries. In the process of testing with the existing test instruments, the readings of the two dial gauges reflecting the penetration are often quite different, which makes it difficult to obtain the value, and the error between the measurement result and the actual penetration is large. There are three fundamental reasons: First, the tester is not level. Due to gravity, the steel ball on the penetration rod is not in close contact with the recess. Under the load, the slight movement of the steel ball will cause a great change in the dial indicator; The second is that the penetration rod is not in complete vertical contact with the top surface of the specimen. Under the action of load, it will inevitably lead to local stress on the penetration rod, which will make the penetration depth of the penetration rod uneven, which is reflected in the large difference in the readings of the dial indicator. The third is that the measuring rod of the dial indicator is not vertical, resulting in a large error between the measurement result and the actual penetration amount.

Contents of the invention

In view of the above-mentioned problems or defects in the prior art, the purpose of this utility model is to provide a simple and effective indoor bearing ratio tester with improved test accuracy.

In order to achieve the above object, the utility model adopts the following technical solutions:

An indoor bearing ratio tester, comprising a base, a test tube and a bracket are arranged on the base, a penetration rod is arranged above the test tube, a first cross bar is arranged on the penetration rod, and the first cross bar is perpendicular to the penetration The penetrating rod is connected to the test tube through a vertical adjustment mechanism, and a first level is arranged on the first horizontal bar; the vertical adjustment mechanism is adjusted to center the air bubble of the first level so that the penetrating rod in a vertical position.

Specifically, the vertical adjustment mechanism includes a vertical rod fixed on the side wall of the test tube, a second horizontal rod is movably arranged on the vertical rod, and the second horizontal rod is fixedly connected with the penetrating rod.

Specifically, the end of the second cross bar passes through the vertical bar, and the second cross bar is arranged perpendicular to the vertical bar; the end of the second cross bar is provided with a brake screw.

Further, a second level is provided on the support, and a plurality of leveling feet are provided at the bottom of the base.

Compared with the prior art, the utility model has the following technical effects:

1. The tester of the present invention makes the penetrating rod in a vertical state by adjusting the vertical adjustment mechanism, thus avoiding the local force on the penetrating rod and uneven penetration depth of the penetrating rod, reducing the difference between the measurement result and the actual penetrating rod. input error.

2. The second level is set on the bracket, and there are multiple leveling feet on the bottom of the base. Adjust the leveling angle and observe the bubbles of the second level until the bubbles are in the center and the base is in a horizontal state, so as to adjust the entire tester to be in a horizontal state. , to ensure the accuracy of the test results.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is a schematic diagram of the base structure;

Fig. 3 is a schematic structural diagram of a vertical adjustment mechanism;

Fig. 4 is a schematic diagram of the roof structure;

The symbols in the figure represent: 1—base, 2—test cylinder, 3—penetration rod, 4—first cross bar, 5—vertical adjustment mechanism, 501—vertical bar, 502—second cross bar, 503—system Moving screw, 6—the first level, 7—the second level, 8—leveling angle, 9—pressure handwheel, 10—piston rod, 11—indicator, 12—bracket, 1201—top plate, 1202—vertical Straight rod, 13—force measuring ring.

Below in conjunction with accompanying drawing and embodiment, the scheme of the utility model is further explained and described in detail.

detailed description

According to the above technical scheme, referring to Fig. 1-4, the indoor bearing ratio tester of the present invention includes a base 1 on which a test tube 2 and a bracket 12 are arranged, and a penetrating rod 3 is arranged on the top of the test tube 2, The penetration rod 3 is provided with a first crossbar 4, the first crossbar 4 is arranged perpendicular to the penetration rod 3, the penetration rod 3 is connected with the test cylinder 2 through a vertical adjustment mechanism 5, and the first crossbar 4 is provided with The first level 6 ; adjust the vertical adjustment mechanism 5 to center the air bubbles of the first level 6 to make the penetrating rod 3 in a vertical state.

The tester of the utility model makes the penetrating rod 3 in a vertical state by adjusting the vertical adjustment mechanism 5, that is, the bubble of the first level 6 is in the center; the two ends of the first horizontal bar 4 are perpendicular to the first horizontal bar 4. A measuring rod is installed on which a dial indicator 11 is installed. When the penetrating rod 3 is in a vertical state, the measuring rod is also in a vertical state, thus avoiding the local force on the penetrating rod 3 and the penetrating rod 3 In the case of uneven penetration depth, the error between the measurement result and the actual penetration amount can be reduced.

The base 1 is provided with a jack, and the piston rod 10 of the jack supports the test cylinder 2; the support 12 includes a top plate 1201 and two vertical rods 1202, and a force measuring ring 13 is installed under the top plate 1201 to measure A dial indicator 11 is arranged in the force ring 13 . The base 1 is provided with a pressure handwheel 9 for applying different forces to the piston rod 10 of the jack.

Specifically, the vertical adjustment mechanism 5 includes a vertical rod 501 fixed on the side wall of the test cylinder 2, and a second horizontal rod 502 is movably arranged on the vertical rod 501, and the second horizontal rod 502 is connected with the penetrating Rod 3 is fixedly connected. Optionally, the end of the second cross bar 502 passes through the vertical bar 501 , and the second cross bar 502 is arranged perpendicular to the vertical bar 501 ; the end of the second cross bar 502 is provided with a brake screw 503 .

Before the experiment starts, observe the bubble position of the first level 6, if the bubble is not in the center, loosen the brake screw 503, adjust the second cross bar 502 to move along the length direction of the second cross bar 502 relative to the vertical bar 501, and observe the bubble Position, until the air bubble is in the center, lock the brake screw 503, at this time, the penetrating rod 3 is in the vertical position.

Further, the bracket 1 is provided with a second level 7, the second level 7 is arranged on the top plate 1201, and a plurality of leveling feet 8 are provided at the bottom of the base 1, and the leveling angle 8 is adjusted to observe the second The level 7 bubbles until the bubbles are in the center and the base 1 is in a horizontal state, thereby adjusting the entire tester to be in a horizontal state to ensure the accuracy of the test results.

Optionally, both the first vial 6 and the second vial 7 are circular vials or tube vials.

The specific usage method when the device of the present invention is used for the penetration test is as follows:

(1) The test piece is placed in the test cylinder 2, and the bottom end of the penetrating rod 3 is in contact with the test piece;

(2) Observe the bubble position of the second level 7, adjust the leveling angle 8, so that the bubble of the second level 7 is centered;

(2) Observe the bubble position of the first level 6, loosen the brake screw 503, adjust the position of the second cross bar 502, make the bubble of the first level 6 center, and lock the brake screw 503;

(3) Start the jack, so that the piston rod 10 of the jack moves up, and the top of the penetration rod 3 contacts the force measuring ring 13;

(4) Adjust the pressure handwheel 9, apply 45N pressure to the piston rod 10 of the jack, and adjust the dial indicator 11 in the force measuring ring 13 to zero;

(5) Continue to adjust the pressure handwheel 9 to apply pressures of different sizes to the piston rod 10 of the jack, and record the multiple readings of the dial indicator 11 at both ends of the first cross bar 4, i.e. the amount of penetration;

(6) Draw the pressure-penetration curve and calculate the bearing ratio.

Claims (4)

1. an indoor bearing-ratio test instrument, including pedestal (1), pedestal (1) is provided with examination cylinder (2) and support (12), examination cylinder (2) is provided above injection bar (3), injection bar (3) is provided with the first cross bar (4), first cross bar (4) is perpendicular to injection bar (3) and arranges, it is characterized in that, described injection bar (3) is connected with described examination cylinder (2) by vertical governor motion (5), and a described cross bar (4) is provided with the first spirit level (6); Regulating vertical governor motion (5) makes the bubble of the first spirit level (6) make injection bar (3) be in vertical state between two parties.

2. indoor bearing-ratio test instrument as claimed in claim 1, it is characterized in that, described vertical governor motion (5) includes the montant (501) being installed on described examination cylinder (2) sidewall, being movably set with the second cross bar (502) on montant (501), the second cross bar (502) is connected with described injection bar (3).

3. indoor bearing-ratio test instrument as claimed in claim 2, it is characterised in that the end of described second cross bar (502) is through described montant (501), and the second cross bar (502) is perpendicular to montant (501) and arranges; The end of the second cross bar (502) is provided with clamp screw (503).

4. indoor bearing-ratio test instrument as claimed in claim 1, it is characterised in that being provided with the second level device (7) on described support (3), pedestal (1) bottom is provided with multiple levelling foot (8).