CN203866812U - Roadbed rebound modulus determinator - Google Patents

Abstract

The utility model discloses a roadbed rebound modulus determinator comprising a rack. The rack is vertically arranged and in a cylindrical shape; the upper end of the rack is covered with a support plate; the support plate is provided with a winch; a rope of the winch passes through the support plate and extends into the rack; a heavy hammer and a bearing plate are orderly arranged on the rope entering the rack from up to bottom; and the bottom of the bearing plate is provided with a strain foil. With the soft bearing plate, damage to a roadbed structure during test can be avoided; a change chart of strain over time can be directly described via a display screen and further rebound modulus of the roadbed can be calculated; the heavy hammer and the winch are integrated, so as long as the determinator is adjusted and a level bubble stays in the middle, the heavy hammer can be placed in the middle of the rack and convenient use is provided; four rollers are arranged outside the rack, so the determinator can move and labor intensity can be reduced; and the roadbed rebound modulus determinator is simply structured with easy use operation, so labor intensity is reduced and work efficiency is improved.

Description

A kind of subgrade resilient modulus analyzer

Technical field

The utility model relates to a kind of instrument of testing subgrade resilient modulus, is specifically related to a kind of subgrade resilient modulus analyzer.

Background technology

At present, China's road surface modulus of resilience conventional detection method backman beam method, Falling Weight Deflectometer(are called for short FWD) Falling Weight Deflectometer, flexible loaded plate method and rigid bearing plate method are measured the dynamic flexure on road surface, and inverse goes out the modulus of resilience method on road surface.Except flexible and rigid bearing plate method, other tester equipment all greatly, cost is higher, and malfunction, workload are also larger.In addition, utilize rigid bearing plate method to test, road pavement has very large damage; Although flexible loaded plate can overcome the deficiency of rigid bearing plate, flexible loaded plate method operates very difficult, easily makes mistakes.

China's subgrade resilient modulus conventional detection method is rigid bearing plate and flexible loaded plate method.These two kinds of method of testings as mentioned above, all have pros and cons, and test speed are slower, and workload is larger.In addition,, for the measurement of subgrade resilient modulus, because roadbed supporting capacity is limited, the test of the big machineries such as vehicle will produce destruction to roadbed.

At present, the modulus of resilience of roadbed is measured, and utilizes prior art to carry out surveying work amount larger.In addition, in most cases, roadbed is in construction works, and vehicle cannot enter, and large-scale instrument is lack scope for their abilities, as backman beam method, Falling Weight Deflectometer(are called for short FWD) Falling Weight Deflectometer.But this index of the modulus of resilience has directiveness effect to construction, therefore must survey and establish.

Summary of the invention

The technical problems to be solved in the utility model is for the deficiencies in the prior art, provides a kind of simple in structure, easy to operate, improves and measures efficiency, reduces labour intensity and roadbed is not produced the subgrade resilient modulus analyzer of infringement.

In order to realize above-mentioned task, the utility model by the following technical solutions:

A kind of subgrade resilient modulus analyzer, comprise support, described support is the cylindrical stent vertically arranging, support upper end is coated with gripper shoe, in gripper shoe, be provided with capstan winch, the rope of capstan winch stretches in support through gripper shoe, stretches on the rope in support and is disposed with weight and loaded plate from top to bottom, and loaded plate bottom is provided with foil gauge.

Further, on described frame bottom edge, be symmetrically arranged with roller, wheel lock be installed, the height-adjustable of each roller on roller.

Further, described support plate upper surface is provided with air level.

Further, described foil gauge adopts resistance strain type sensor, and foil gauge is connected with a display screen being arranged in support plate upper surface.

Further, described loaded plate adopts flexible board, and loaded plate is parallel to the axial line setting of support, and the external diameter of loaded plate is equal to or less than the internal diameter of support.

Further, described rope is connected to the center of weight and loaded plate.

Further, described weight and the distance between loaded plate are not less than 1/2 of support height.

The infringement to road structure in test process has been avoided in the existence of the flexible loaded plate of the utility model; Display screen Direct function description goes out strain schemes over time, and then calculates the modulus of resilience of roadbed; Weight and capstan winch are integrally formed, and only need to adjust instrument itself and make air level placed in the middle, can make weight in carriage center, easy to use; Support is provided with four rolling outward, makes instrument have mobility, greatly less labour intensity.The utility model is simple in structure, uses simple to operately, has reduced labour intensity, increases work efficiency.

Accompanying drawing explanation

Fig. 1 is elevation of the present utility model;

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

Fig. 3 is top view of the present utility model;

Fig. 4 is strain temporal evolution schematic diagram while testing in embodiment;

Number in the figure representative: 1-loaded plate, 2-roller, 3-weight, 4-rope, 5-capstan winch, 6-foil gauge, 7-support, 8-gripper shoe, 9-display screen, 10-air level;

The specific embodiment

Defer to technique scheme, as shown in Figure 1 to Figure 3, a kind of subgrade resilient modulus analyzer, comprises support 7, adopts cylindrical stent 7 in this programme, and the lower end of this cylindrical stent 7 connects, and upper end is coated with gripper shoe 8, and gripper shoe 8 is cemented in the upper end of support 7.In gripper shoe 8, be provided with capstan winch 5, the rope 4 of capstan winch 5 stretches in support 7 through gripper shoe 8.

Capstan winch 5 is arranged on the center of gripper shoe 8, and making rope 4 is also the axial line place of support 7 through the position of gripper shoe 8.Rope 4 is flexible rope 4, is provided with weight 3 and loaded plate 1 on the rope 4 in support 7.In this programme, loaded plate 1 adopts flexible board, and flexible board refers to the plate body that can deformation occur within the specific limits but can not rupture under the effect of external force.Flexible board can be avoided the damage to roadbed in test process.

Rope 4 connects the center of weight 3 and loaded plate 1, makes loaded plate 1 be parallel to the axial line of support 7.Loaded plate 1 is circular slab, and its external diameter is equal to or less than the internal diameter of support 7, should be slightly less than.Between loaded plate 1 and weight 3, maintain a certain distance, this distance is not less than 1/2 of support 7 height, makes weight 3 can keep enough potential energy, in addition, also can adjust as required the length of rope 4 between weight 3 and loaded plate 1.

Due to support 7 and weight 3 heavier, in order to be convenient to the movement of this instrument in when test, in support 7 bottoms, be provided with roller 2.Roller 2 is symmetricly set on the edge of support 7 bottoms, does not affect the effect of 1 pair of roadbed of loaded plate.On roller 2, be provided with wheel lock and heighten nut.While shifting this instrument onto need test roadbed, according to the air level 10 of gripper shoe 8 upper surfaces, the height of pair roller 2 is by heightening nut adjustment, when gripper shoe 8 is during completely in level, closes wheel lock, fixes this device.

Loaded plate 1 bottom centre place is provided with foil gauge 6, and in this programme, foil gauge 6 adopts resistance strain type sensor, and foil gauge 6 is connected with a display screen 9 that is arranged on gripper shoe 8 tops.When loaded plate 1 contacts with roadbed, the strain that roadbed produces is gathered by foil gauge 6, foil gauge 6 can test out measurand under weight 3 effects, (loaded plate 1 is flexible board, has elasticity, and weight 3 can constantly be upspring and fall over time in vertical direction strain, until weight 3 is static), and when strain capacity is shown in the display screen on bracing frame upper surface 9, preserve, be convenient to derive and check analysis.Easily know the changing value Δ ε of weight 3 strain in first bounce process, by the calculating to Δ ε, can obtain the modulus of resilience value of measurand.

Job step of the present utility model is as follows:

1. by roller 2, shift this analyzer onto tested roadbed;

2. shake capstan winch 5 loaded plate 1 is landed, if loaded plate 1 is not in support 7 centers, can artificially align;

3. check that whether air level 10 is placed in the middle, if bubble is not placed in the middle, smooth roadbed or pair roller 2 are heightened until air level 10 is placed in the middle;

4. decontrol capstan winch 5, make weight 3 free-fallings;

5. weight 3 clashes into loaded plate 1, and upsprings, then falls, until be still on loaded plate 1, foil gauge 6 has recorded strain in whole process by display screen 9 and schemed over time (as shown in Figure 4);

6. by variation diagram, calculate t ₀to t ₁the absolute value delta ε of strain variation in process, and calculate the modulus of resilience by following formula

$E=\frac{2\mathrm{mg}(1-{\mathrm{\μ}}^2)}{\mathrm{\Δ\ϵ\πrz}}$

In formula, E is the modulus of resilience (Pa); M is weight 3 quality (kg); μ is the poisson's ratio of roadbed; Δ ε is tested numerical value; R is the radius (m) of loaded plate 1; Z is bed thickness (m).

7. according to instructions for use, operate five times equally continuously;

8. in five test values, calculate average, obtain test result.

Claims (7)

1. a subgrade resilient modulus analyzer, comprise support (7), it is characterized in that, described support (7) is the cylindrical stent vertically arranging, support (7) upper end is coated with gripper shoe (8), in gripper shoe (8), be provided with capstan winch (5), the rope (4) of capstan winch (5) stretches in support (7) through gripper shoe (8), stretch on the rope (4) in support (7) and be disposed with weight (3) and loaded plate (1) from top to bottom, loaded plate (1) bottom is provided with foil gauge (6).

2. subgrade resilient modulus analyzer as claimed in claim 1, is characterized in that, on described support (7) bottom margin, is symmetrically arranged with roller (2), wheel lock is installed, the height-adjustable of each roller (2) on roller (2).

3. subgrade resilient modulus analyzer as claimed in claim 1, is characterized in that, the upper surface of described gripper shoe (8) is provided with air level (10).

4. subgrade resilient modulus analyzer as claimed in claim 1, is characterized in that, described foil gauge (6) adopts resistance strain type sensor, and foil gauge (6) is connected with a display screen (9) being arranged on gripper shoe (8) upper surface.

5. subgrade resilient modulus analyzer as claimed in claim 1, it is characterized in that, described loaded plate (1) adopts flexible board, and loaded plate (1) is parallel to the axial line setting of support (7), and the external diameter of loaded plate (1) is equal to or less than the internal diameter of support (7).

6. subgrade resilient modulus analyzer as claimed in claim 1, is characterized in that, described rope (4) is connected to the center of weight (3) and loaded plate (1).

7. subgrade resilient modulus analyzer as claimed in claim 1, is characterized in that, the distance between described weight (3) and loaded plate (1) is not less than 1/2 of support (7) height.