CN204594987U - Improved vertical contact method concrete shrinkage measuring instrument - Google Patents

Abstract

The utility model provides a pair of vertical contact method concrete shrinkage measuring apparatu of improved generation, including base, supporting screw, installing support, the perpendicular rigid coupling of supporting screw is on the base, and the installing support passes through the sliding sleeve and installs on supporting screw, and both ends are fixed by the retaining member about the sliding sleeve, are fixed the amesdial in the through-hole of installing support by locking screw. The utility model discloses can be in the experiment quick, the accurate change value of measuring concrete shrinkage test piece, avoided the error that the concrete transport brought. No precision calibration is required.

Description

An Improved Vertical Contact Method Concrete Drying Shrinkage Measuring Instrument

technical field

The utility model relates to a concrete drying shrinkage measuring instrument, in particular to an improved vertical contact method concrete drying shrinkage measuring instrument.

Background technique

At present, there are three kinds of instruments for measuring concrete drying shrinkage, namely bow-shaped screw micrometer, specific length meter and horizontal concrete drying shrinkage meter. Although these instruments have mechanical or electronic types, the measurement methods are similar. They all place the test piece on the instrument, and then use the instrument to align the metal heads at both ends of the concrete drying shrinkage test piece for reading.

Because the concrete drying shrinkage test has high environmental requirements, it cannot be directly measured in the drying shrinkage chamber during the test. According to the existing measuring equipment at present, when measuring the shrinkage of concrete, it is necessary to take the specimen out of the constant temperature shrinkage chamber and place it on the instrument for reading. In this way, the following problems will appear, which will affect the accuracy of the measurement data.

1. Due to the large concrete drying shrinkage test pieces, each piece is about 12KG, so the test pieces are heavy. In addition, each group must have 3 test pieces, so the workload of moving the test pieces will be very heavy.

2. The maximum length of the concrete shrinkage test piece is 51.5cm, so the test piece is relatively large, and bumps will inevitably occur when moving the test piece. If the metal probes at both ends of the concrete test piece are damaged, the test piece will be scrapped. Great loss of test data. And because the concrete drying shrinkage test requires high precision (the measurement precision is 0.01mm), so even some tiny touch deformations will affect the accuracy of the test results.

3. Because the current instruments for measuring concrete shrinkage measure the probes at both ends of the specimen, it is necessary to pre-embed metal probes when forming the specimen. However, in the actual operation process, it is difficult to control the pre-embedded depth of the probe, and it is easy to appear that the pre-embedded depth is too shallow or too deep. If it is too shallow, the overall length of the specimen is too long, which is easy to exceed the measurement range, and the probe will fall off due to the shallow pre-embedding and insufficient concrete wrapping; if it is too deep, the probe will be completely wrapped by the concrete, and the measuring instrument The probe cannot be accessed and measurements cannot be made.

Utility model content

In order to solve the above technical problems, the utility model provides an improved vertical contact method concrete drying shrinkage measuring instrument, the improved vertical contact method concrete drying shrinkage measuring instrument does not need to embed metal probes, avoiding The error caused by it reduces the error caused by the deformation of the original test instrument during the handling process, does not require precision calibration, and accurately measures the test data.

The utility model is realized through the following technical solutions.

An improved vertical contact method concrete drying shrinkage measuring instrument is characterized in that it includes a base, a supporting screw, and a mounting bracket. The supporting screw is vertically fixed on the base, and the mounting bracket is installed on the supporting screw through a sliding sleeve. Both ends are fixed by locking pieces, and the dial indicator is fixed in the through hole of the mounting bracket by locking screws.

The mounting bracket is provided with a through hole for mounting a dial indicator.

A straight groove is formed on the mounting bracket along the opposite direction of the sliding sleeve, and the straight groove passes through the center of the through hole.

Locking screws are used at the end of the slot on the mounting bracket to lock the slot.

The locking element is a nut.

Four corners at the bottom of the base are provided with feet.

The beneficial effects of the utility model are:

Compared with the prior art, the vertical contact method concrete drying shrinkage measuring instrument provided by the utility model has the following advantages compared with the traditional instrument:

1. Since the test piece is directly placed on the bottom plate without metal probes, the measurement accuracy is higher.

2. Since the test piece is vertically placed on the bottom plate, under the action of the test piece’s own weight, the end of the test piece is more fully in contact with the bottom plate.

3. Since the test piece is fixed on the bottom plate, there is no need for precision calibration for long-term trial use.

Description of drawings

Fig. 1 is a front view of the utility model.

Figure 2 is a top view of the utility model.

Fig. 3 is the front view of the utility model after the concrete drying shrinkage test piece is installed.

In the figure: 1-base plate, 2-supporting screw, 3-installation bracket, 4-locking piece, 5-locking screw, 6-dial indicator, 7-foot, 8-slot, 9-through hole , 10-glass plate, 11-concrete shrinkage test piece, 12-sliding sleeve.

Detailed ways

The technical solution of the utility model is further described below, but the scope of protection is not limited to the description.

The improved vertical contact method concrete drying shrinkage measuring instrument provided by the utility model includes a base 1, a supporting screw 2, and a mounting bracket 3, and is characterized in that: the supporting screw 2 is vertically fixed on the base 1, and the mounting bracket 3 passes through a sliding sleeve 12 is installed on the supporting screw rod 2, the upper and lower ends of the sliding sleeve 12 are fixed by the locking member 4, and the dial indicator 6 is fixed in the through hole 9 of the mounting bracket 3 by the locking screw 5. The change value of the concrete specimen can be obtained from the reading of the dial gauge.

The mounting bracket is provided with a through hole 9 for mounting the dial indicator 6 . Easy to install dial indicator 6.

A glyph groove 8 is formed on the mounting bracket 3 along the opposite direction of the sliding sleeve, and the glyph groove 8 passes through the center of the through hole 9 . The end of the inline groove 8 adopts locking screw 5 to lock the inline groove 8. It is convenient to fix the dial gauge 6.

In order to better adjust the mounting bracket 3, the locking member 4 is a nut.

The bottom four corners of the base 1 are provided with feet 7 . The measuring instrument is placed more stably and the weight of the measuring instrument is reduced.

When conducting the concrete drying shrinkage test, first place the bracket of the improved vertical contact method concrete drying shrinkage tester in the constant temperature drying shrinkage chamber, then vertically stand the concrete drying shrinkage test piece on the base 1, and then place the glass sheet 10 on the On the test piece 11, adjust the fixed knob 4 to about 3 cm above the glass sheet 10, then insert the dial indicator 6 from the fixed knob 4, press against the glass sheet 10, tighten the fixed knob 4, and observe the dial gauge 6 when it reaches the age. Take the reading in Table 6, and the change value of the concrete drying shrinkage test piece can be accurately measured by reading.

Claims (5)

1. An improved vertical contact method concrete drying shrinkage measuring instrument, comprising a base (1), a support screw (2), and a mounting bracket (3), characterized in that: the support screw (2) is vertically fixed on the base (1 ), the mounting bracket (3) is installed on the support screw (2) through the sliding sleeve (12), the upper and lower ends of the sliding sleeve (12) are fixed by the locking piece (4), and the thousandth point is fixed by the locking screw (5). Table (6) is fixed in the through hole (9) of mounting bracket (3). 2. The improved vertical contact method concrete dry shrinkage measuring instrument as claimed in claim 1, characterized in that: said mounting bracket (3) is provided with a font groove (8) along the opposite direction of the sliding sleeve, and The groove (8) passes through the center of the through hole (9). 3. The improved vertical contact method concrete drying shrinkage measuring instrument as claimed in claim 1, characterized in that: the end of the inline groove (8) on the mounting bracket (3) is fixed by a locking screw (5) The font groove (8) is locked. 4. The improved vertical contact method concrete drying shrinkage measuring instrument according to claim 1, characterized in that: the locking member (4) is a nut. 5. The improved vertical contact method concrete drying shrinkage measuring instrument according to claim 1, characterized in that: the bottom four corners of the base (1) are provided with feet (7).