CN209148688U - An adjustable concrete early crack resistance test device - Google Patents

Abstract

The utility model discloses a kind of adjustable concrete early-stage crack resistance experimental rigs, including bottom plate and it is trapped among the two long side plates and two short side plates of bottom plate surrounding, there is uniform graduation mark on long side plate, long side plate both ends set fixed plate, short side board ends weld a root long screw rod, laterally uniform 6 threaded holes of short side plate, the adjustable limiter of threaded hole intubating length, short side plate are connect with long side plate by screw rod.3 stress induced generators are uniformly distributed among bottom plate, the stress induced generator includes the first steel plate and the second steel plate, first steel plate and second steel plate one end are slidably connected with bottom plate, the other end is connected by rotary shaft, the rotating shaft terminal is equipped with telescopic rod, and the telescopic rod is connected with bottom plate.Test block size is adjusted by screw rod, by angle between adjusting telescopic rod the first steel plate of adjusting, test specimen rapid crack propagation can be made in the identical situation of other experimental conditions, this experimental rig is easy to operate, is convenient in demoulding, and improves test efficiency.

Description

An adjustable concrete early crack resistance test device

technical field

The utility model belongs to the technical field of concrete early crack resistance test, in particular to an adjustable concrete early crack resistance test device.

Background technique

Concrete is one of the most widely used and used building materials at present. Cracking is a common problem of concrete. The early cracking performance of concrete is an important indicator to measure the performance of concrete. Therefore, how to quickly and effectively test the early crack resistance of concrete is a hot research topic at present.

At present, in order to test the early crack resistance of concrete with different proportions, the laboratory often adopts the flat plate method recommended by GB/T20082-2009 "Standard for Long-term Performance and Durability of Ordinary Concrete". The larger the size, the larger the workload during molding, and the cooperation of multiple people is required. After the test is completed, due to the large size of the test piece, the test piece and the mold are closely attached together, and it takes a lot of time and energy to demold the test piece. Great care is needed when removing the formwork, and sometimes too much force can cause the stress-induced generator to deform, thereby affecting the accuracy of the next test.

The patent with the application number CN201520891391.0 discloses a concrete early crack resistance test device, which includes a bottom plate and two long side plates and two short side plates surrounding the bottom plate. 7 special-shaped crack inducers in eight areas, the special-shaped crack inducer is parallel to the short side plate, the two ends of the special-shaped inducer are respectively connected and fixed with the two long side plates; the angle formed by the long side plate and the bottom plate, the short side The included angles formed by the plate and the bottom plate are all obtuse angles; air inlet holes are respectively provided in the eight regions of the bottom plate. However, this device has poor adjustability and can only be fixedly formed. Therefore, it is necessary to develop a test device with simple operation and easy demoulding.

SUMMARY OF THE INVENTION

The purpose of this utility model is to solve the problems existing in the prior art, to provide an adjustable concrete early crack resistance test device, which is simple to operate, easy to demould, and can adjust the size of the formed concrete, adding a vertical limiter , under the same other conditions, the specimen can be cracked quickly.

For achieving the above object, the technical scheme adopted by the present utility model is:

An adjustable concrete early crack resistance test device, comprising a bottom plate, two long side plates and two short side plates surrounded by four sides, three stress inducing generators are evenly distributed in the middle of the bottom plate, characterized in that the Six first threaded holes are evenly distributed in the lateral direction of the short side plate, the first threaded holes are inserted into the limiter with adjustable length, and the stress inducing generator includes a first steel plate and a second steel plate, the first steel plate and the second steel plate. One end of the steel plate is connected with the bottom plate through a sliding connector, and the other end is connected by a rotating shaft to form an included angle. The two ends of the rotating shaft are provided with telescopic rods. The telescopic rods can be manual telescopic rods or hydraulic telescopic rods. The telescopic rods connected to the base plate.

Further, the long side plates are provided with uniform scale lines.

Further, both ends of the long side plate are welded with a fixing plate with second threaded holes, and both ends of the short side plate are welded with screw rods. To ensure strength, the fixing plate is made of steel.

Further, the second threaded hole is provided with a first bolt, which facilitates the adjustment of the size of the formed concrete specimen through the first bolt.

Further, the long side plate and the bottom plate are connected by a second bolt, which facilitates disassembly of the long side plate and the bottom plate.

Further, the bottom plate and the telescopic rod are detachably connected, and the detachment method may be a threaded connection or a snap connection.

Further, a third bolt is provided at the first threaded hole, so that the depth of the inserted concrete specimen can be adjusted by the third bolt.

Further, the sliding connector includes a sliding block arranged on the first steel plate and the second steel plate and a sliding groove arranged on the bottom plate.

When demoulding, remove all bolts, hit the short side plate with a plastic hammer to separate the short side plate from the limiter, then turn the concrete specimen over and hit the bottom with a rubber hammer to demould.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The accessories of the test device can be disassembled, which is easy to operate and easy to demould, which greatly improves the test efficiency.

2. The forming size can be adjusted, and the early crack resistance test can be done for different size specimens.

3. By adjusting the length of the telescopic rod, the angle between the first steel plate and the second steel plate can be adjusted, thereby changing the size and direction of the crack initiation force.

Description of drawings

Fig. 1 is the top view of the utility model test device;

Fig. 2 is the front view of the utility model test device;

Fig. 3 is the sectional view of the stress-inducing generator of the utility model;

In the figure: 1. Bottom plate; 2. Long side plate; 3. Short side plate; 4. Stress induction generator; 5. Screw rod; 6. Limiter; 7. Second bolt; 8. First bolt; 9. The third bolt; 10, the fixed plate; 11, the first steel plate; 12, the rotating shaft; 13, the telescopic rod; 14, the second steel plate; 15, the chute; 16, the slider.

Detailed ways

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of the embodiments. 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.

Embodiment 1:

As shown in Figures 1-3, the utility model discloses an adjustable concrete early crack resistance test device. The long side plate 2 and the short side plate 3 of the mold are welded by angle steel, the thickness is not less than 5mm, and the length is not less than 5mm. The size of the side plate 2 is 1000mm×100m, the size of the short side plate 3 is 600mm×100m, the size of the first steel plate is 50mm×50mm, the diameter of the screw rod 5 and the limiter 6 is 10mm, and the length is 200mm.

An adjustable concrete early crack resistance test device, comprising a bottom plate 1 and two long side plates 2 and two short side plates 3 surrounding the bottom plate 1, and three stress inducing generators 4 are evenly distributed in the middle of the bottom plate 1, which are It is characterized in that the short side plate 3 evenly distributes 6 first threaded holes in the lateral direction, the first threaded holes are inserted into the limiter 6 with adjustable length, and the stress inducing generator 4 includes a first steel plate 11 and a second steel plate. 14. One end of the first steel plate 11 and the second steel plate 14 is connected with the bottom plate 1 through a sliding connector, and the other end is connected by a rotating shaft 12 to form an included angle. The two ends of the rotating shaft 12 are provided with telescopic rods 13. The telescopic rod 13 may be a manual telescopic rod or a hydraulic telescopic rod, and the telescopic rod 13 is connected to the base plate 1 . By adjusting the length of the telescopic rod 13, the first steel plate 11 and the second steel plate 14 slide on the bottom plate through the sliding connection, and then the angle between the first steel plate 11 and the second steel plate 14 is adjusted, and the crack initiation force is changed. and direction.

The long side plate 2 and the bottom plate 1 are connected by second bolts 7, so that the long side plate 2 and the bottom plate 1 can be easily disassembled.

Both ends of the long side plate 2 are welded with a fixing plate 10 with second threaded holes, the fixing plate 10 is made of steel plates, and the two ends of the short side plate 3 are welded with screw rods 5 .

A first bolt 8 is provided at the second threaded hole, so that the size of the formed concrete specimen can be adjusted easily through the first bolt 8 .

The bottom plate 1 and the telescopic rod 13 are detachably connected, and the detachment method may be screw connection or snap connection.

A third bolt 9 is provided at the first threaded hole, so that the depth of the inserted concrete specimen can be adjusted by the third bolt 9 .

The sliding connector includes a sliding block 16 arranged on the first steel plate 11 and the second steel plate 14 and a sliding groove 15 arranged on the bottom plate 1 .

When demoulding, remove all bolts, hit the short side plate 3 with a plastic hammer to separate the short side plate 3 from the limiter 6, then turn the concrete specimen over and hit the bottom with a rubber hammer to demould.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. a kind of adjustable concrete early-stage crack resistance experimental rig, including bottom plate and it is trapped among two long side plates and two of surrounding A short side plate is uniformly distributed 3 stress induced generators among the bottom plate, which is characterized in that the short side plate is laterally homogeneous 6 the first threaded holes, the adjustable limiter of the first threaded hole intubating length are distributed, the stress induced generator includes the One steel plate and the second steel plate, first steel plate and second steel plate one end are connected by sliding connector with bottom plate, and the other end is logical It crosses rotary shaft and is connected to form an angle, the rotating shaft terminal is equipped with telescopic rod, and the telescopic rod is connected with bottom plate.

2. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that the long side Plate is equipped with uniform graduation mark.

3. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that the long side Board ends welding has the fixed plate of the second threaded hole, and the short side board ends are welded with screw rod.

4. a kind of adjustable concrete early-stage crack resistance experimental rig as claimed in claim 3, which is characterized in that described second The first bolt is equipped at threaded hole.

5. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that the long side Plate is bolted with the bottom plate by second.

6. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that the bottom plate It is to be detachably connected between the telescopic rod.

7. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that described first Third bolt is equipped at threaded hole.

8. a kind of adjustable concrete early-stage crack resistance experimental rig as described in claim 1, which is characterized in that the sliding Connector includes the sliding slot that first steel plate and sliding block on second steel plate is arranged in and is arranged on bottom plate.