CN203561542U - Improved Concrete Shear Pressure Meter - Google Patents

Abstract

The utility model discloses an improved concrete shear compression apparatus which comprises a base frame, wherein a first counterforce support and a second counterforce support with adjustable mounting positions are mounted on the base frame; the first counterforce support is connected with a detachable oil pressure mechanical jack; a digital pressure gauge is mounted on the oil pressure mechanical jack; a screw of the oil pressure mechanical jack is vertical to the base frame and is sleeved with a T-shaped internal hexagonal wrench for applying shear compression force; a pressure head matched with a pressure bearing plate is arranged on the side surface of the oil pressure mechanical jack; the pressure bearing plate is mounted on a spherical head of a spherical head screw rod; and the spherical head screw rod is rotatably mounted in a screw hole of the second counterforce support. The improved concrete shear compression apparatus disclosed by the utility model has the advantages of high detection precision, high working efficiency and convenience in operation.

Description

Improved Concrete Shear Pressure Meter

technical field

The utility model relates to an improved concrete shear pressure instrument.

Background technique

At present, the basic models of commonly used concrete shear pressure instruments are manufactured in accordance with CECS 278-2010 "Technical Regulations for Testing the Compressive Strength of Concrete by Shear Compression Method". The deficiencies of the commonly used concrete shear pressure meter are as follows:

1. The "screw" adjusts the distance. The screw is slender and the length of the screw is about 500mm. For slender objects, after being under pressure, especially if the concrete surface is uneven or non-right angle, it is easy to bend or eccentric, making the detection impossible.

2. Clause 4.1.1 of the specification states: the maximum thickness of the member that can be sheared and compressed by the common concrete shear pressure instrument is 500mm; for larger components, it is necessary to specially manufacture the shear pressure instrument with a longer base frame. Since the base frame of the commonly used concrete shear pressure instrument is relatively flat, it is easy to produce side bending after being compressed. Therefore, the commonly used concrete shear pressure instrument can only detect concrete members with a thickness of ≤500 mm.

3. The net distance between the "pressure head" and the base frame is about 20mm, which is relatively short. In actual operation, if there is a plaster layer (generally 10mm-30mm) on the concrete surface, it must be removed and perpendicular to the bearing surface of the component. The detection can only be done after the painting layer of the adjacent surface, and the workload is relatively large.

4. Since the commonly used concrete shear pressure instrument is placed on opposite sides of the "screw rocker" and "hand pump handle", the working space required on both sides is relatively large, and the positions on both sides are fixed and cannot be disassembled. In a narrow situation, it cannot be operated or is inconvenient to operate.

5. Due to the small space between the "pressure head", "pressure bearing plate" and "base frame", the commonly used concrete shear pressure instrument cannot be directly calibrated with a force measuring device, and can only be calibrated with a special calibration block, which is inconvenient. And it has a certain influence on the detection accuracy.

To sum up, due to the above shortcomings of commonly used concrete shear pressure instruments, on the one hand, it affects the accuracy of detection, on the other hand, it increases the workload and reduces the work efficiency.

Contents of the invention

The purpose of the utility model is to provide an improved concrete shear pressure instrument with high detection precision, high work efficiency and convenient operation.

For reaching the purpose of the invention, the technical scheme adopted by the utility model is:

The improved concrete shear pressure instrument is characterized in that it includes a base frame, and the first reaction force support and the second reaction force support with adjustable installation positions are installed on the base frame, and the first reaction force support A detachable hydraulic mechanical jack is connected to the top, and a digital pressure gauge is installed on the hydraulic mechanical jack. The screw rod of the hydraulic mechanical jack is set perpendicular to the base frame, and a T-shaped Allen wrench, the side of the hydraulic mechanical jack is provided with a pressure head that cooperates with the pressure plate; the pressure plate is installed on the ball head of the ball screw, and the ball screw is rotatably installed In the screw hole of the second reaction support.

Further, the base frame is provided with evenly distributed base frame round holes, and the first reaction force support and the second reaction force support are installed above the base frame by cooperating with the base frame round holes through connecting screws.

Further, the length of the screw rod of the ball screw is 250mm.

Further, the distance from the lower surface of the indenter to the upper surface of the base frame is 40 mm. the

Further, the hydraulic mechanical jack is connected to the first reaction force support through screws.

The utility model adjusts the distance between the pressure head and the pressure bearing plate by changing the installation positions of the first reaction force support and the second reaction force support. 50% of the screw length of the pressure gauge. After being under pressure, the screw rod will always maintain the state of axial compression, and there will be no bending or eccentric compression of the screw rod.

The base frame of the utility model is made of a thick steel plate, and the thickness of the steel plate can be calculated and determined according to the thickness of the concrete member and the stress state, and no lateral bending phenomenon will occur.

The utility model increases the clear distance between the indenter and the base frame, even if there is a plaster layer on the concrete surface, it can be detected without removing it.

The utility model uses a hydraulic mechanical jack to replace the hand pump of the commonly used concrete shear pressure instrument. The screw rod of the hydraulic mechanical jack is perpendicular to the concrete component, and does not occupy the working space on both sides. The hydraulic mechanical jack is connected with the first reaction force support by screws. After the screws are disassembled, the hydraulic mechanical jack can be directly placed in the verification device composed of the reaction force frame and the verification instrument or other verification devices.

The beneficial effects of the utility model:

(1) The length of the ball head screw is shorter than that of the commonly used concrete shear pressure instrument, which reduces the bending or eccentricity of the screw rod when it is too slender and compressed; the net distance between the indenter and the base frame is increased, so that the instrument does not need to remove the paint Layers can also be detected.

(2) The distance between the indenter and the bearing plate is adjusted by adjusting the installation positions of the first reaction force support and the second reaction force support to adjust the detection thickness, which can detect > 80mm concrete components and expand the application range.

(3) The improved concrete shear pressure meter uses screws to adjust the distance between the instrument and both sides, and can flexibly adjust the working space on both sides. However, the commonly used concrete shear pressure meter cannot adjust the working space on both sides because its position is fixed.

(4) The hand pump of the commonly used concrete shear pressure instrument is replaced by a hydraulic mechanical jack, which greatly reduces the product cost and is easy to repair if it is damaged.

(5) Since the hydraulic mechanical jack is connected by screws, it can be disassembled for routine verification, which improves the accuracy and practicability.

Description of drawings

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

Fig. 2 is the use schematic diagram of the utility model.

Detailed ways

The utility model will be further described below in conjunction with specific embodiments, but the utility model is not limited to these specific embodiments. Those skilled in the art should realize that the present invention covers all alternatives, improvements and equivalents that may be included within the scope of the claims.

Referring to Fig. 1 and Fig. 2, the improved concrete shear pressure instrument includes a base frame 10, and the first reaction force support 4 and the second reaction force support 11 with adjustable installation positions are installed on the base frame 10. A detachable hydraulic mechanical jack 1 is connected to the first reaction support 4, a digital pressure gauge 3 is installed on the hydraulic mechanical jack 1, and the screw rod 7 of the hydraulic mechanical jack 1 is vertical to the base frame. It is provided with a T-shaped inner hex wrench 6 for applying shear pressure, and the side of the hydraulic mechanical jack 1 is provided with a pressure head 2 that cooperates with the pressure plate 12; the pressure plate 12 is installed on the ball On the ball head of the head screw 13 , the ball head screw 13 is rotatably installed in the screw hole of the second reaction support 11 .

The base frame 10 is provided with evenly distributed base frame round holes 9, and the first reaction force support 4 and the second reaction force support 11 are all mounted on the base frame through connecting screws 8 and the base frame round holes 9. 10 above.

The length of the screw rod of the ball screw 13 is 250mm.

The distance from the lower surface of the indenter 2 to the upper surface of the base frame 10 is 40mm. the

The hydraulic mechanical jack 1 is connected with the first reaction support 4 through a screw 5 .

The utility model adjusts the distance between the pressure head 2 and the pressure bearing plate 12 by changing the installation positions of the first reaction force support 4 and the second reaction force support 11, so the length of the screw rod of the ball head screw 13 is shortened, About 50% of the screw length of the commonly used concrete shear pressure instrument. After being under pressure, the screw rod will always maintain the state of axial compression, and there will be no bending or eccentric compression of the screw rod.

The base frame 10 of the utility model is made of a thick steel plate, and the thickness of the steel plate can be calculated and determined according to the thickness of the concrete member and the stress state, and no lateral bending phenomenon will occur.

The utility model increases the net distance between the indenter 2 and the base frame 10, even if there is a plaster layer on the concrete surface, it can be detected without removing it.

In the utility model, the hydraulic mechanical jack 1 is used to replace the hand pump of the commonly used concrete shear pressure instrument. The screw rod 7 of the hydraulic mechanical jack 4 is perpendicular to the concrete member, and does not occupy the working space on both sides. The hydraulic mechanical jack 1 and the first reaction force support 4 are connected by screws 5. After the screw 5 is disassembled, the hydraulic mechanical jack 1 can be directly placed in the verification device composed of the reaction force frame and the verification instrument or other verification devices. Medium test.

The utility model uses a working process as follows:

(1) Before operation, the working status of the shear pressure instrument should be checked, and the operation can only be carried out after confirming that it is in good working condition;

(2) According to the thickness of the concrete member 14 and the size of the working space on both sides, adjust the installation positions of the first reaction force support 4 and the second reaction force support 11, so that the distance between the pressure bearing plate 12 and the pressure head 2 is slightly larger than that of the concrete member 14 thickness;

(3) The axis of the indenter 2 is perpendicular to the pressure bearing surface 15 of the component, and the adjacent surface perpendicular to the cylindrical surface of the indenter 2 and the pressure bearing surface 15 of the component should be tangent. If there is a plaster layer 16 on the pressure-bearing surface, it should be slightly chiseled off so that the pressure head 2 bears against the concrete surface, and the paint layer 16 on the adjacent surface perpendicular to the pressure-bearing surface 15 of the component does not need to be chiseled off;

(4) Turn on the digital pressure gauge 3, press the reset key and keep the digital pressure gauge 3 in the peak hold state;

(5) Set the T-shaped hexagonal wrench 6 on the screw 7 of the hydraulic mechanical jack 4, apply shear pressure continuously and uniformly, and the speed of force should be controlled within 1.0kN/s until the concrete at the shear pressure part is damaged, record the damage state and shear pressure at failure, accurate to 0.1 kN.

The calculation and other requirements are carried out according to CECS 278-2010 "Technical Regulations for Testing the Compressive Strength of Concrete by Shear Compression Method".

The utility model uses a working process as follows:

(1) Unscrew the screw 5, and take out the hydraulic mechanical jack 1 (with pressure head);

(2) Put the hydraulic mechanical jack 1 in the verification device composed of the reaction force frame and the verification instrument or other verification devices;

(3) Set the T-shaped hexagonal wrench 6 on the screw 7 of the hydraulic mechanical jack 1, apply force continuously and evenly, and perform verification according to the conventional method.

Claims (5)

1. The improved concrete shear pressure instrument is characterized in that: it comprises a base frame, and the first reaction force support and the second reaction force support with adjustable installation positions are installed on the base frame, and the first reaction force support A detachable hydraulic mechanical jack is connected to the support, and a digital pressure gauge is installed on the hydraulic mechanical jack. The screw rod of the hydraulic mechanical jack is vertically arranged with the base frame, and the screw for applying shear pressure is set on it. T-shaped inner hexagonal wrench, the side of the hydraulic mechanical jack is provided with a pressure head that cooperates with the pressure plate; the pressure plate is installed on the ball head of the ball screw, and the ball screw can be rotated installed in the screw hole of the second reaction support. 2. The improved concrete shear pressure instrument according to claim 1, characterized in that: the base frame has evenly distributed base frame round holes, the first reaction force support, the second reaction force support All are installed on the top of the base frame through connecting screws and the round holes of the base frame. 3. The improved concrete shear pressure instrument according to claim 1 or 2, characterized in that: the length of the lead screw of the ball screw is 250mm. 4. The improved concrete shear pressure instrument according to claim 3, characterized in that: the distance from the lower surface of the indenter to the upper surface of the base frame is 40 mm. 5. The improved concrete shear pressure instrument according to claim 4, characterized in that: the hydraulic mechanical jack is connected to the first reaction force support through screws.

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