CN204287012U - The charger of steel-concrete bonding sample corrosion test under effect of stress - Google Patents

Abstract

The utility model discloses a loading device for a corrosion test of a steel bar-concrete bonded sample under the action of stress, which comprises a frame, a loading mechanism, a sample fixture, a force lever and a connecting rod, and the loading mechanism takes a metering lever as the main body The weighting lever mechanism is adopted, the booster lever is arranged under the metering lever, and the booster lever is hinged with the frame through the fulcrum knife bearing group of the booster lever; the upper end of the connecting rod is connected with the key knife bearing of the metering lever, and the lower end is The tool bearing group of the lever force arm is hinged with the end of the boosting lever; the sample fixture is hinged with the boosting lever through the key tool bearing group of the boosting lever. The loading mechanism of the utility model is a weighing lever mechanism with a measuring lever as the main body. The force reading is intuitive and convenient. The force lever can use a large-sized lever, which is convenient for applying greater stress to the test piece. The hinge point adopts a knife bearing group. High force precision.

Description

Loading device for corrosion test of steel-concrete bonded specimens under stress

[technical field]

The utility model relates to a loading device for a corrosion test of reinforced concrete, in particular to a loading device for a corrosion test of a steel bar-concrete bonding sample under stress.

[Background technique]

Bearing load is the main mission and inherent characteristic of reinforced concrete structures. The size and form of load will have different effects on the mechanical properties of reinforced concrete, resulting in stress corrosion of reinforced concrete. The interfacial bonding properties of steel-concrete are the prerequisite for the work of steel-concrete two materials, and it is also the guarantee for the best performance of the combined material and structure of reinforced concrete. Stress corrosion will directly affect the bond performance of steel-concrete interface, resulting in changes in the long-term performance of reinforced concrete structures. Furthermore, due to early people's unclear understanding and insufficient attention to the durability of reinforced concrete structures, the harsh environment in which reinforced concrete structures are located will also have an impact on the mechanical properties of reinforced concrete, forming environmental corrosion of reinforced concrete; Corrosion becomes another important cause of degradation of steel-concrete bond performance. In order to accurately analyze the mechanical properties of reinforced concrete structures after simultaneous corrosion of stress and environment, it is very important to understand the coupling effect of stress and environmental corrosion on the bonding characteristics of steel-concrete interface, and corresponding corrosion devices are required. At present, people have designed various stress corrosion devices. The stress corrosion devices seen on the market use spring structures, mechanical transmission systems, hydraulic control systems or counterweights to apply tension or pressure to the test pieces, and the continuous loading process is measured by instruments. Relevant parameters of reinforced concrete members. However, these devices are not aimed at reinforced-concrete bonded components, and most of them do not involve the coupling effect with environmental corrosion, and have the following disadvantages:

Existing corrosion installations need to be modified to achieve stress corrosion of the steel-concrete bond interface.

After a long period of stretching or compression of the spring or mechanical transmission system, stress relaxation will occur, and the load will gradually decrease, which will affect the loading accuracy and bring great difficulties to the analysis of test results.

Member deformation caused by concrete creep further increases the stress relaxation of springs or loading devices of mechanical transmission systems.

The stress corrosion device of the hydraulic system needs to design a corresponding control system, which is complicated and costly.

The invention patent with the patent number of 200810066321.6 discloses a loading device for the corrosion test of concrete samples under stress, including a frame, a graduated upper beam, a lower beam, loading weights, a dowel bar, an upper force roller and The lower afterburner, one end of the upper beam is hinged with one side of the frame, the other end is hung with a loading weight, and there is an upper slider in the middle that slides longitudinally along the upper beam; the concrete sample is placed on the upper afterburner and Between the lower force rollers, the lower part of the dowel rod transmits force to the concrete sample through the upper force rollers, and the lower force rollers are supported by the base of the frame. The other side of the frame is hinged, the upper slide block is pressed on the top of the lower beam, and the lower beam is pressed on the top of the dowel bar. This invention can overcome the stress relaxation problem of the spring applied force, but this loading device has the following disadvantages in use: 1) it cannot be used to apply stress corrosion to the steel bar-concrete bonded test piece; and 2) it adopts two force rollers To apply stress, two scales are needed. The magnitude of the applied force is not intuitive, and the calculation of the stress is troublesome. At the same time, the lower beam needs to be equipped with a scale, and the rigidity is low, so it is impossible to apply a large stress to the specimen; 3) The force application device adopts ordinary The hinged way, the accuracy of force application is low.

[Content of the invention]

The technical problem to be solved by the utility model is to provide a loading device for the corrosion test of steel-concrete bonded samples under stress with intuitive force readings, which is convenient for applying relatively large stress to the test piece and has high force application accuracy.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is a loading device for corrosion test of steel-concrete bonded samples under stress, including a frame, a loading mechanism, a sample fixture, a force lever and a connecting rod. The loading mechanism is a weighing lever mechanism with the metering lever as the main body. The booster lever is arranged below the metering lever, and the booster lever is hinged to the frame through the fulcrum knife bearing group of the booster lever; the upper end of the connecting rod is connected to the metering lever. The key tool bearing is connected, and the lower end is hinged with the end of the force lever through the force arm knife support group of the force lever; the sample holder is hinged with the force lever through the key tool support group of the force lever.

In the above-mentioned loading device, the weighing lever mechanism includes a scale frame, an increasing weight, a weight hanging, a swimming weight, and the metering lever. The frame is hinged, and the mound hanger is suspended on the end of the long force arm of the metering lever through the mound hanger knife bearing group.

In the above-mentioned loading device, the connecting rod is an adjustable connecting rod.

In the loading device described above, the upper part of the frame includes an upper beam, the fulcrum knife bearing of the booster lever is fixed below the upper beam, and the fulcrum knife of the booster lever is fixed on the booster lever.

The above-mentioned loading device, the frame base includes a lower beam, the sample fixture includes a connector, a pressing plate and a plurality of tension screws, the middle of the pressing plate includes a steel bar hole, and the periphery of the pressing plate includes a plurality of screw holes; the concrete block of the concrete sample Arranged under the pressure plate, the concrete sample steel bar goes upward through the steel bar hole in the middle of the pressure plate, and connects with the joint head, which is connected with the key knife bearing of the booster lever; the lower beam includes a plurality of screw holes, and the tension screw passes through the lower beam The screw hole of the screw hole and the screw hole of the pressure plate fix the pressure plate above the lower beam.

The above-mentioned loading device includes a container for containing the corrosive liquid, and the container is placed between the pressing plate and the lower beam, and the concrete block of the concrete sample is arranged in the container.

In the above-mentioned loading device, the connecting head includes a connecting rod, a connecting fork, a spherical sleeve and a pin shaft, and the end of the connecting fork includes a threaded hole, and the external thread on the upper end of the concrete sample steel bar is screwed into the threaded hole of the connecting fork; The fork of the fork includes a pin hole, one end of the connecting rod includes an external thread, and the other end includes a spherical hole, the spherical sleeve is installed in the spherical hole, and the outer surface of the spherical sleeve is adapted to the spherical hole; the pin shaft passes through the connecting fork. The inner hole of the pin hole and the spherical sleeve combines the connecting rod and the connecting fork; the external thread of the connecting rod is screwed into the threaded hole of the key knife bearing of the booster lever.

In the above-mentioned loading device, the fulcrum knife bearing of the booster lever and the key knife bearing of the booster lever each include a U-shaped knife bearing seat, two connecting plates and two knife bearing blocks, and the U-shaped knife bearing seat includes a connecting portion And two side plates, the connecting part includes threaded holes, the side plate is hook-shaped, the knife bearing block is fixed on the inside of the hook head of the side plate, and the opening of the side plate is connected into one by the connecting plate; the fulcrum knife of the afterburner lever and the afterburner The key knife of lever is respectively fixed in the fulcrum knife hole and the key knife hole of the afterburning lever.

In the loading device described above, the included angle between the metering lever and the boosting lever is 10-20° when viewed from the projection plane.

The loading mechanism of the loading device for the corrosion test of the steel bar-concrete bonded sample under the action of stress is a weighing lever mechanism with a measuring lever as the main body. It is convenient to apply a large stress to the test piece, and the hinge point adopts a knife bearing group, and the force application accuracy is high.

[Description of drawings]

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

Fig. 1 is a structural diagram of the loading device of the embodiment of the utility model.

Fig. 2 is a top view of the loading device of the embodiment of the utility model.

Fig. 3 is a partially enlarged view of part I in Fig. 1 .

Fig. 4 is a front view of the booster lever of the embodiment of the utility model.

Fig. 5 is a top view of the booster lever of the embodiment of the utility model.

Fig. 6 is a front view of the tool holder of the utility model embodiment of the force-added lever.

Fig. 7 is a cross-sectional view taken along line A in Fig. 6 .

Fig. 8 is a front view of the knife block of the utility model embodiment of the force-added lever.

Fig. 9 is a top view of the knife block of the utility model embodiment of the force-added lever.

Fig. 10 is the front view of the fulcrum knife and the key knife of the utility model embodiment of the booster lever.

Fig. 11 is the left side view of the fulcrum knife and the key knife of the utility model embodiment.

[Detailed ways]

The structure of the embodiment of the loading device for the corrosion test of the steel bar-concrete bonded sample under the action of stress of the utility model is shown in Figure 1 to Figure 11, including a frame 1, a weighing lever mechanism with a measuring lever 2 as the main body, and a loading device. Force lever 10, connecting rod and specimen holder.

The metering lever 2 and the boosting lever 10 are mutually staggered, and the included angle α between the metering lever 2 and the boosting lever 10 is 13° on the projected plane viewed from above.

The weighing lever mechanism also includes a scale frame 3, an increasing mound 4, a mound hanging 5, a counterweight 6 and a swimming mound 7. The scale frame 3 is fixed on the top of the frame 1, the metering lever 2 is hinged with the scale frame 3 through the metering lever fulcrum knife bearing group (the metering lever fulcrum knife bearing group is not shown), the weight hanging 5 is suspended on the The end of the long moment arm of metering lever 2.

The adding lever 10 is arranged under the metering lever 2, and the adding lever 10 is hinged with the frame 1 through the adding lever fulcrum knife bearing group. The sample fixture is hinged with the force lever 10 through the key tool bearing group of the force lever.

The structure of the boosting lever 10 is shown in FIG. 4 and FIG. 5 , including a fulcrum hole 1001 , a key hole 1002 and a force arm hole 1003 of the boosting lever. The fulcrum knife 8 and the key knife 9 of the boosting lever 10 are respectively fixed in the fulcrum knife hole 1001 and the key knife hole 1002 of the boosting lever 10, and the boosting lever force arm knife hole 1003 is fixed with the power boosting lever force arm knife.

The fulcrum knife bearing of the booster lever 10 and the key knife bearing of the booster lever 10 each comprise a U-shaped knife bearing seat 11, two connecting plates 12 and two knife bearing blocks 13, and the U-shaped knife bearing seat includes a connecting portion 1101 and Two side plates 1102 have a threaded hole 1103 in the connecting portion, and the side plates 1102 are hook-shaped, and the knife holder block 14 is fixed on the inboard of the side plate 1102 hooks, and the opening of the side plates 1102 is connected into one by the connecting plate 12 by screws.

The metering lever 2 transmits force to the adding lever 10 through the connecting rod 14, and the connecting rod 14 is a connecting rod with adjustable length.

The upper end of connecting rod 14 is connected with the knife bearing 25 of the key knife bearing group of metering lever, and the lower end is hinged with the end of adding lever force arm knife bearing group 26 and 10 moments of force arm by adding force lever.

There is an upper beam 101 on the frame 1 top, and the knife holder 11 of the force-applying lever fulcrum knife bearing is fixed on the below of the upper beam 101 by screws 15 .

There is a lower beam 102 on the base of the frame 1 , and the sample fixture includes a connector, a pressing plate 16 , a bottom plate 17 and four tension screws 18 . There is a reinforcement hole 1601 in the middle part of the pressing plate 16, and the pressing plate 16 and the base plate 17 each have 4 screw holes. The concrete block 100 of the concrete sample is arranged under the pressure plate 16, and the steel bar 200 of the concrete sample passes upward through the reinforcement hole 1601 in the middle of the pressure plate 16, and is connected with the connector. Lower beam 102 has 4 screw holes, tension screw 18 passes the screw hole of lower beam 102, the screw hole of base plate 17 and the screw hole of pressing plate 16, and pressing plate 16 is fixed on the top of lower beam 102.

The container 28 containing the corrosive liquid is placed on the base plate 17, between the pressing plate 16 and the lower beam 102, and the concrete block 100 and the lower part of the steel bar 200 of the concrete sample are immersed in the corrosive liquid of the container 28.

Connecting head comprises connecting rod 19, connecting fork 20, spherical sleeve 21 and bearing pin 22, and the end of connecting fork 20 has a threaded hole, and the external thread of concrete sample steel bar 200 upper end is screwed in the threaded hole of connecting fork 20. The fork of connecting fork 20 has a pin hole, and one end of connecting rod 19 has external thread, and the other end has a spherical hole, and spherical sleeve 21 is installed in the spherical hole of connecting rod 19, and the outer surface of spherical sleeve 21 and The spherical hole is adapted, and the two form a universal hinge. The pin shaft 22 passes through the pin hole of the connecting fork 20 and the inner hole of the spherical sleeve 21 to combine the connecting rod 19 and the connecting fork 20 together. The external thread of connecting rod 19 is screwed in the threaded hole of force lever key cutter holder cutter holder 11.

The body of the test piece is immersed in a container 28 containing a corrosive liquid to achieve accelerated deterioration of the test piece. Before loading, adjust the initial zero point balance through the counterweight 6, and one end of the power arm of the metering lever 2 can hang the weight 4 through the weight hanging 5, and the height position of the connector of the sample fixture can be changed by adjusting the length of the adjustable connecting rod 14.

Metering lever 2 changes the size of the load and can directly read the load of the load by increasing or decreasing the weight 4 and moving and adjusting the weight 7.

The fulcrum and bearing point of metering lever 2 and afterburning lever 10 all use knife bearing structure.

Using the above-mentioned multi-stage lever structure, the fulcrum and force-bearing point of the large and small levers use the knife and knife bearing structure, the frictional resistance is small, and the force transmission accuracy is high. Compared with the existing stress corrosion device, the device is small in size, simple in manufacture, and Low cost, high rigidity, high precision, and simpler operation. The stress corrosion of components is realized through the secondary amplification of the lever, without stress relaxation, and the amplitude of the holding stress is significantly improved, and it can be applied to larger specimens.

Claims (9)

1. the charger of steel-concrete bonding sample corrosion test under effect of stress, comprise frame, load maintainer and specimen holder, it is characterized in that, comprise afterburning lever and connecting rod, load maintainer is the leverage of weighing based on measuring lever, afterburning lever arrangement is in the below of measuring lever, and it is hinged with frame that afterburning lever holds group by the fulcrum pivot of afterburning lever; The upper end of connecting rod is held with the emphasing knife of measuring lever and is connected, and the end that group and afterburning lever are held by afterburning lever arm of force cutter in lower end is hinged; Specimen holder by the emphasing knife of afterburning lever hold group with afterburning lever hinged.

2. charger according to claim 1, it is characterized in that, leverage of weighing comprises scale frame, increases stone roller, cuts or polish jade with an emery wheel extension, sliding weight and described measuring lever, scale frame is fixed on the top of frame, measuring lever by measuring lever fulcrum pivot hold group with scale frame hinged, stone roller hang by stone roller hang cutter hold the end that group is suspended on the long arm of force of measuring lever.

3. charger according to claim 1, is characterized in that, described connecting rod is adjustable in length connecting rod.

4. charger according to claim 1, is characterized in that, upper rack comprises entablature, and the fulcrum pivot of afterburning lever holds and is fixed on below entablature, and the fulcrum pivot of afterburning lever is fixed on afterburning lever.

5. charger according to claim 1, is characterized in that, the base of frame comprises sill, and specimen holder comprises connector, pressing plate and complex root pulling force screw rod, and the middle part of pressing plate comprises reinforced hole, and the periphery of pressing plate comprises a plurality of screw hole; The concrete block of concrete sample is arranged in the below of pressing plate, and concrete sample reinforcing bar is upward through the reinforced hole in the middle part of pressing plate, is connected with connector, and connector holds with the emphasing knife of afterburning lever and is connected; Sill comprises a plurality of screw hole, and pressing plate, through the screw hole of sill and the screw hole of pressing plate, is fixed on above sill by pulling force screw rod.

6. charger according to claim 5, is characterized in that, comprises the container of splendid attire corrosive liquid, and described container is placed between pressing plate and sill, and the concrete block of concrete sample is arranged in a reservoir.

7. charger according to claim 5, is characterized in that, connector comprises connecting link, yoke, spherical sleeve and bearing pin, and the end of yoke comprises threaded hole, concrete sample reinforcing bar upper end screw in the threaded hole of yoke; The fork of yoke comprises pin-and-hole, and one end of connecting link comprises external thread, and the other end comprises sphere hole, and spherical sleeve is arranged in sphere hole, the outside surface of spherical sleeve and sphere hole adaptation; Connecting link and yoke, through the pin-and-hole of yoke and the endoporus of spherical sleeve, are combined by bearing pin; In the threaded hole that the emphasing knife screwing into afterburning lever of connecting link holds.

8. charger according to claim 1, it is characterized in that, the fulcrum pivot of afterburning lever holds and holds the cutter bearing respectively comprising U-shaped, two pieces of web joints and two pieces of cutter supporting blocks with the emphasing knife of afterburning lever, U-shaped cutter bearing comprises connecting portion and two blocks of side plates, connecting portion comprises threaded hole, side plate is hook-type, and cutter supporting block is fixed on the inner side of side plate gib head, and the opening of side plate is linked into an integrated entity by web joint; In the fulcrum tool bore that the afterburning fulcrum pivot of lever and the emphasing knife of afterburning lever are separately fixed at afterburning lever and emphasis tool bore.

9. charger according to claim 1, is characterized in that, in downward projection face, the angle of measuring lever and afterburning lever is 10-20 °.