CN217505866U - Steady layer of water dry shrinkage experiment measuring device of mainly used building site laboratory - Google Patents

Abstract

The utility model discloses a steady layer of water dry shrinkage experiment measuring device of mainly used building site laboratory, including base, bracing piece and measuring end, its characterized in that: the base is a thin plate, the edge of the base is fixedly connected with a supporting rod, and a measuring end is movably arranged on the supporting rod; the cantilever right-hand member detachable of measuring terminal installs on the bracing piece, left end detachable mounting amesdial, cantilever middle section upper surface mount spirit level. The bottom of the utility model is used for placing the sample to be measured and installing the supporting rod, the movable installing and measuring end on the supporting rod can be adjusted in height and locked by the teeth, thereby avoiding the displacement error or error; a level meter is installed, so that the experimental environment level is ensured, and errors are reduced; the measurement is carried out through a dial indicator, so that the measurement precision is ensured; this project organization is reasonable, small in size conveniently carries, easy dismounting, and the cost of manufacture is low, and the error is less, can satisfy the measurement requirement of building site laboratory water steady layer dry shrinkage experiment.

Description

A device for measuring the drying shrinkage of a water stabilized layer mainly used in the construction site laboratory

technical field

The utility model belongs to the field of measuring instruments for water stabilization layer drying shrinkage experiments, in particular to a water stabilization layer drying shrinkage experiment measuring device which is mainly used in a construction site laboratory.

Background technique

The water-stabilized layer is the abbreviation of the cement stabilized gravel base, that is, the cement is used to consolidate the graded gravel, and it is completed by compaction and maintenance. The water-stable mix ratio should be tested in the laboratory in advance to determine the cement content and the ratio of coarse and fine aggregates, and at the same time determine the maximum dry density. Large quantities can be mixed with a water-stabilized mixing station.

Cement-stabilized crushed stone is made of graded crushed stone as aggregate, and a certain amount of cementitious material and sufficient mortar volume are used to fill the gap of the aggregate, and it is paved and compacted according to the principle of embedding. The degree of compaction is close to the degree of compaction, and the strength mainly depends on the principle of interlocking and locking between the crushed stones, and there is enough mortar volume to fill the voids of the aggregate. Its initial strength is high, and the strength increases with age and quickly forms a plate body, so it has high strength, good impermeability and frost resistance. The dosage of water stabilized cement is generally 3% to 6% of the mixture, and the unconfined compressive strength of 7 days can reach 1.5 to 4.0mpa, which is higher than other roadbed materials. After the water is stable and survives, it is not muddy in case of rain, and the surface is firm. It is an ideal base material for advanced pavement.

Dry shrinkage of cement concrete is a harmful volume change that is unavoidable during the use of cement concrete. At present, the test method for shrinkage index in the national standard GB/T 25181-2010 "Ready-Mixed Mortar" JGJ/T 70-2009 "Test Method for Basic Properties of Building Mortar", Clause 12, the sample size is 40mm×40mm×160mm prism , and in the center of the two end faces of the test mold, put the specified shrinkage head, and then place it in a vertical mortar shrinkage tester for testing. This method deviates from the actual test concept due to the short length of the sample and the free shrinkage of the sample. On the one hand, the sample length is short and there is not enough deformation, so the result cannot be measured; on the other hand, the test data is the sample under the free shrinkage. In practical application, it is found that although the test results of the samples meet the requirements of national standards, the wall mortar always cracks in application. Guide for practical application. In addition, due to the large volume of the test piece for the dry shrinkage experiment of the water stabilized layer currently used in the construction site laboratory and the measurement device, the test piece is difficult to form, expensive, and not suitable for repeated handling.

In order to solve the above problems, this paper proposes an experimental measurement device for the dry shrinkage of the water stabilized layer mainly used in the laboratory of the construction site.

Utility model content

In order to solve the above technical problems, the utility model designs a water stable layer drying shrinkage experiment measuring device mainly used in the laboratory of the construction site. The bottom is used to place the sample to be tested and install the support rod. , the height is adjustable, and the teeth are locked to avoid errors or errors in displacement; a spirit level is installed to ensure the level of the experimental environment and reduce errors; the measurement is performed by a dial indicator to ensure the measurement accuracy.

In order to achieve the above-mentioned technical effect, the present utility model is realized through the following technical solutions: a water stable layer dry shrinkage experiment measuring device mainly used in a construction site laboratory, comprising a base, a support rod and a measuring end, and is characterized in that: the said The base is a thin plate, the edge is fixedly connected to the support rod, and the measuring end is movably installed on the support rod; the right end of the cantilever of the measuring end is detachably installed on the support rod, the left end is detachably installed with a dial indicator, and the upper surface of the middle section of the cantilever is installed with a spirit level.

Further, the base is a rectangular or circular thin plate with uniform thickness, and a reinforcing rib is arranged at the connection between the base and the support rod.

Further, three grooves are arranged on the surface of the middle and upper sections of the support rod along the axial direction, and the distance between two adjacent grooves is 90°; a number of teeth are arranged at the bottom of the grooves.

Further, it is characterized in that the front side, rear side and right side of the right end of the cantilever are movable installation screws, the screw ends are fixed with installation knobs, and the screws correspond to the grooves respectively; Teeth are provided on the rod.

Further, the left end of the cantilever is provided with a knob tightening device.

The beneficial effects of the present utility model are:

The utility model designs a water stable layer drying shrinkage experiment measuring device mainly used in a construction site laboratory. The bottom is used for placing the sample to be tested and installing a support rod. The movable installation measuring end on the support rod is adjustable in height. The teeth are locked to avoid errors or errors in displacement; a spirit level is installed to ensure the level of the experimental environment and reduce errors; the measurement is carried out by a dial indicator to ensure the measurement accuracy; the design is reasonable in structure, small in size, easy to carry, disassemble and assemble The utility model has the advantages of convenience, low production cost and small error, and can meet the measurement requirements of the drying shrinkage experiment of the water stable layer in the laboratory of the construction site.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the overall structure schematic diagram of the present utility model;

Fig. 2 is the front view of the present utility model;

Fig. 3 is the structural schematic diagram of the measuring end of the present invention;

4 is a schematic diagram of the structure in the groove of the present utility model;

In the accompanying drawings, the list of components represented by each number is as follows:

1, base; 2, support rod; 201, groove; 3, measuring end; 301, cantilever; 302, fixing device; 303, spirit level; 304, knob tightening device; 305, dial indicator; 306, screw rod; 307, Active rod.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1

Referring to Figures 1 to 4, a water stable layer drying shrinkage experiment measuring device mainly used in a construction site laboratory comprises a base 2, a support rod 2 and a measuring end 3, and is characterized in that: the base 2 is a thin plate, The edge is fixedly connected to the support rod 2, and the measuring end 3 is movably installed on the support rod 2; the right end of the cantilever 301 of the measuring end 3 is detachably installed on the support rod 2, the left end is detachably installed with a dial indicator 305, and the middle section of the cantilever 301 A spirit level 303 is installed on the upper surface.

The base 2 is a rectangular or circular thin plate with uniform thickness, and reinforcing ribs are arranged at the connection between the base 2 and the support rod 2 to keep the support rod 2 stable.

Three grooves 201 are arranged on the surface of the middle and upper sections of the support rod 2 along the axial direction, and the distance between two adjacent grooves 201 is 90°; the bottom of the grooves 201 is provided with a number of teeth.

It is characterized in that the front, rear and right sides of the right end of the cantilever arm 301 can be moved with a mounting screw 306, the end of the screw 306 is fixed with a mounting knob, and the screw 306 corresponds to the groove 201 respectively; the front end of the screw 306 is hinged and movable The rod 307 and the movable rod 307 are provided with teeth, which cooperate with the teeth in the groove 201, and the movable rod 307 and the support rod 2 cannot produce relative displacement when locked, which avoids errors or even errors caused by displacement.

The left end of the cantilever 301 is provided with a knob tightening device 304 for detachably installing the dial indicator 305 .

Example 2

The utility model designs a water stable layer drying shrinkage experiment measuring device mainly used in a construction site laboratory. The bottom is used for placing the sample to be measured and installing a support rod 2. The support rod 2 has a movable installation measuring end 3, and the height can be adjusted. Adjustment, locking through the teeth, avoiding errors or errors in displacement; installing a spirit level 303 to ensure the level of the experimental environment and reducing errors; measuring by a dial indicator 305 to ensure measurement accuracy; the design is reasonable in structure, small in size, The utility model has the advantages of convenient portability, convenient disassembly and assembly, low production cost and small error, and can meet the measurement requirements of the dry shrinkage experiment of the water stable layer in the construction site laboratory.

Example 3

How to use: When using, first place the device on a level surface, and use the level 303 for leveling; place the collected sample in the center of the base 2; due to the uneven surface of the sample, place a plate above the sample; adjust the measuring end 3 Height to the appropriate position, and lock the position; observe the dial indicator 305 data regularly and record.

In the description of this specification, description with reference to the terms "one embodiment", "example", "specific example", etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (5)

1. a water stable layer dry shrinkage experiment measuring device mainly used in construction site laboratory, comprising base, support rod and measuring end, it is characterized in that: described base is a thin plate, and the edge is fixedly connected to the support rod, and the support rod is movable The right end of the cantilever of the measuring end is detachably installed on the support rod, the left end is detachably installed with a dial indicator, and the upper surface of the middle section of the cantilever is installed with a spirit level. 2. according to claim 1, it is characterized in that, the base is a rectangular or circular thin plate with uniform thickness, and the base and the support rod connection are provided with Ribs. 3. according to claim 1, a kind of water stable layer dry shrinkage experiment measuring device mainly used in construction site laboratory is characterized in that, three grooves are arranged on the surface of the middle and upper section of the support rod, along the axial direction, adjacent to each other. The distance between the two grooves is 90°; a number of teeth are arranged at the bottom of the grooves. 4. a kind of water stable layer dry shrinkage experiment measuring device mainly used in construction site laboratory according to claim 1 is characterized in that, the right end of described cantilever is a fixing device, and the front side, rear side and right side of the fixing device are all The screw rod is movable, the screw rod end is fixed with the installation knob, and the screw rod and the groove correspond respectively; the front end of the screw rod is hingedly connected to the movable rod, and the movable rod is provided with teeth. 5 . The device for measuring dry shrinkage of a water stable layer mainly used in a construction site laboratory according to claim 4 , wherein the left end of the cantilever is provided with a knob tightening device. 6 .

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