CN210163876U - Device for rapidly detecting compaction degree of road filling foundation - Google Patents

Device for rapidly detecting compaction degree of road filling foundation Download PDF

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CN210163876U
CN210163876U CN201920310035.3U CN201920310035U CN210163876U CN 210163876 U CN210163876 U CN 210163876U CN 201920310035 U CN201920310035 U CN 201920310035U CN 210163876 U CN210163876 U CN 210163876U
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falling
hammer
barrel
compaction
road bed
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葛皖
金德�
安静洁
陈建华
谢鑫
刘玮
郑鹤鸣
沈啸宇
薛菲
陆燕
陈琛
陈望舒
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Shanghai Lander Highway Engineering Consultation & Design Co Ltd
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Shanghai Lander Highway Engineering Consultation & Design Co Ltd
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Abstract

The utility model provides a device of the degree of compaction of short-term test fill road bed, the device includes: the device comprises a falling barrel and a falling hammer, wherein the falling hammer is arranged in the falling barrel, the outer side of the falling barrel is provided with a frame and a handrail, the inside of the falling barrel is provided with a limiting slideway and a locking device, and the lower part of the falling barrel is provided with a glass scale plate; the drop hammer is characterized in that the hammer head is conical, and the rear end of the drop hammer head can be connected with a calibration rod and a counterweight limiting rod piece; the calibration rod can be connected with the falling hammer through a screw, and the counterweight limiting rod piece can be connected with the counterweight. The utility model discloses a scheme has guaranteed device durability and accuracy to but the rapid survey fill road bed compactness.

Description

Device for rapidly detecting compaction degree of road filling foundation
Technical Field
The utility model belongs to the technical field of highway subgrade compactness detects, a device of short-term test soil body compactness is related to, is applicable to the compactness detection of road bed fill.
Background
Compaction, also known as compaction, refers to the ratio of the dry density of the soil or other building material after compaction to the standard maximum dry density, and is expressed as a percentage. The compactness is one of key indexes for detecting the construction quality of the roadbed and the pavement, the compactness condition after on-site compaction is represented, and the higher the compactness is, the higher the density is, and the better the overall performance of the material is. For roadbed, semi-rigid base course of road surface and flexible base course of granular material, the compactness refers to the ratio of dry density actually reached on construction site to the maximum dry density obtained by indoor standard compaction experiment.
The quality of the highway subgrade is the fundamental guarantee of the safety of the highway, the control on the compactness of the highway subgrade is enhanced, the quality of the subgrade is important to guarantee, if the compactness of the subgrade does not reach the standard, the reduction of the compactness of the highway subgrade can be accelerated under the washing and soaking of external rainwater, a series of quality defects of the subgrade and the pavement are caused, the safety and the comfort of driving are influenced, and the maintenance and management cost of the highway at the later stage is increased. In a road bed with a filled road, particularly in a road bed with a high filling degree, the control of the compaction degree in the construction process plays a very important role in the whole engineering quality, and a large number of compaction degree tests are required to ensure the engineering quality. The traditional compaction degree detection technology is slow in detection, long in period and low in efficiency. The requirement of rapid and accurate detection of compaction degree cannot be met.
In recent years, as the road laying speed of China is faster and faster, more and more roads are filled with soil roadbed, the detection demand of the compaction degree of the soil roadbed is larger and larger, and the accurate and rapid determination of the compaction degree becomes a new problem:
(1) the traditional compaction degree measuring method has the advantages that the sampling quantity is small, the measured soil compaction degree is low in representativeness, and strong representative strength is not provided.
(2) The traditional method for measuring the compactness needs to take a soil sample back on site and measure the wet density, the dry density, the compactness and the like in a laboratory, and the time period is long. In the face of rainy regions, the compactness changes every day, and the compactness measured at the early stage loses representativeness.
(3) The traditional compactness measuring method has the disadvantages of large labor consumption, complex operation and complex flow, and needs a plurality of professional experimenters to operate together.
Based on the above description, when the compaction degree of a road bed for filling soil, especially a high fill road bed, is measured, only the traditional compaction degree method is used, the operation is complicated, the phenomenon of work building is easy to occur, and the efficiency of other construction machines cannot be fully exerted.
In view of this, a novel device for rapidly detecting the compaction degree of a road bed filling should be provided to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned technical problem and make, its purpose provides a device of fast detection highway subgrade degree of compaction to accelerate the efficiency that fill road bed degree of compaction detected greatly, make construction technical personnel can obtain newest soil body degree of compaction state data often, simultaneously, guide further construction in the road bed processing.
In order to achieve the purpose, the utility model provides a detection device, it is including the bucket that falls, and this bucket is hollow cylinder, and the lateral wall has vertical bar trompil, and trompil department installation has the glass of scale. A drop hammer, which can make free-falling body movement in the drop barrel; and the calibration rod is used for calibrating the impact distance of the drop hammer.
Preferably, the drop barrel may be 10-15cm in diameter and 100-120 cm in height.
Preferably, the material of the drop bucket may be made of thin-walled steel tubing.
Preferably, the material of the drop hammer may be made of copper-zinc alloy.
The compaction degree of the impacted soil body is determined by measuring the impact distance of the drop hammer, and a plurality of points are taken for carrying out parallel experiments, so that the representativeness and the accuracy of the detection data are improved.
According to foretell description and practice, survey device of degree of compaction to the characteristic of road bed, especially high fill road bed of filling road bed for the speed that the degree of compaction of the soil body detected, ensured the timeliness of degree of compaction data. The method solves the technical problem in the traditional method for detecting the compaction degree of the road bed of the filled soil in the prior art. And the cost of compaction detection is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the falling hammer and the calibration rod of the present invention.
Fig. 3 is a schematic view of the counterweight structure of the present invention.
Fig. 4 is a schematic view of the limiting rod of the present invention.
Fig. 5 is a schematic view of the locking structure of the present invention.
In the figure, 1-a falling barrel, 2-a falling hammer, 11-a limiting slideway, 12-a locking device, 13-a glass scale plate, 14-a frame handrail, 21-a calibration rod, 22-a calibration scale mark, 23-a counterweight limiting rod, 24-a counterweight, 12-1 a locking rubber ring, 12-2 a locking steel ring and 12-3 a limiting lock.
Detailed Description
The following describes an embodiment of the present invention for rapidly detecting the compaction degree of a road bed with reference to the drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not drawn to scale.
Fig. 1 is a schematic view illustrating a detection device according to an embodiment of the present invention. As shown in fig. 1, the detection device of this embodiment of the present invention includes a falling barrel 1, a falling hammer 2, a counterweight 24, a wheel, a frame handrail 14, wherein a limiting slide 11 and a locking device 12 are attached to the falling barrel 1, a vertical bar-shaped opening is formed in the side wall of the falling barrel 1, a glass scale plate 13 with scales is installed at the opening, the falling hammer 2 is installed in the falling barrel 1, a detachable calibration rod 21 with a calibration line is connected behind the falling hammer 2, and the two can pass through the limiting device 12 in the falling barrel 1.
The falling barrel 1 is a hollow cylinder body and is composed of a thin-wall steel pipe, the length is preferably within the range of 100cm to 120cm, the inner diameter is within the range of 10-12 cm, in actual use, the inner diameter and the height of the barrel can be adjusted according to different soil conditions, and a balance weight is increased or decreased so as to be suitable for testing different soil conditions. In this embodiment of the utility model, the size of staving should possess the portability, can suitably adjust according to service environment, nevertheless the embodiment of the utility model is not limited to this.
The limiting slide way 11 is a structure for limiting the displacement direction, is arranged on the inner side of the falling barrel 1, and is matched with the calibration rod 21 during working to ensure that the falling hammer falls vertically.
The locking device 12 comprises a locking rubber ring 12-1, a locking steel ring 12-2 and a limiting lock 12-3, wherein the locking rubber ring is of a structure for limiting the sliding of the falling hammer, the locking steel ring 12-2 is positioned on the outer side of the locking steel ring 12-1, the limiting lock 12-3 is of a spring switch structure, when the device works, the falling hammer is lifted to a certain height, the limiting lock is closed, the locking steel ring is tightened, and the locking rubber ring is meshed with the calibration rod to ensure that the falling hammer is temporarily fixed at a certain height.
The drop hammer 2 comprises a conical hammer head 25 and a calibration rod 21, wherein the outer diameter of the hammer head 25 is slightly smaller than the inner diameter of the drop barrel 1, the drop hammer 2 is guaranteed to freely drop, acceleration in other directions of the drop hammer 2 is guaranteed to be avoided, the drop hammer is guaranteed to vertically impact a soil body, and the calibration rod 21 is used for measuring the depth of the impact soil body. The calibration rod 21 is provided with calibration graduation marks 22, which are compared with the glass scale plate for reading the impact distance.
The counterweight limiting rod 23 is arranged on the hammer 25 and used for installing the counterweight 24, the counterweight 24 is of an annular structure, the outer diameter of the counterweight 24 is smaller than the inner diameter of the falling barrel 1, the inner diameter of the counterweight 24 is larger than the outer diameter of the calibration rod 21, the counterweight can conveniently fall from the top end of the calibration rod 21 and can move along with the falling hammer 2. The counterweight is provided with a limiting hole 241 matched with the limiting rod 23.
Preferably, the lower end of the counterweight limiting rod 23 can rotate freely relative to the hammer 25, the middle of the counterweight limiting rod is provided with a flange 231, and the upper end surface of the counterweight limiting rod is provided with a groove. The upper end of the counter weight limiting hole 241 is matched with the middle part structure of the limiting rod 23, and the limiting rod 23 can be conveniently inserted. And the middle part of the limiting hole 241 is provided with a clamping groove, when the limiting rod 23 is rotated, the flange 231 is clamped with the clamping groove, the fixing of the counter weight is realized, and the falling hammer and the calibration rod are ensured to be kept in an integral body in the impact process. The rotation angle is preferably 90 degrees. The rotation may be achieved by an external tool inserted into a groove in the upper end surface of the stopper rod 23.
In another embodiment, the cross section of the counterweight limiting rod 23 is a non-circular structure, and the dimension of at least part of the surface position of the counterweight limiting rod from the axis of the limiting rod is a gradually increasing structure. The cross section of the limiting hole 241 is of a non-circular structure, and the size of the distance from the axis of the limiting hole to at least part of the position is smaller than the size of the distance from the surface of the limiting rod 23 to the axis of the limiting rod. Thus, after the limiting hole 23 is inserted into the limiting hole 241, the limiting rod is rotated to realize clamping and fixing. Preferably, the material of at least one of the limiting hole and the limiting rod at the clamping position is a material with certain elasticity. Such as rubber or the like.
The material of the drop hammer 2 adopts steel core nickel plating alloy, so that the physical and chemical properties are stable, and the drop hammer is not easy to corrode, and the data is accurate.
During operation, firstly, calibrating the instrument in an area with known compactness, reading calibration scale marks of the calibration rod 2 and scales of the corresponding glass scale plate 13 for different impact depths of the falling hammer 2 of soil bodies with different compactnesses, and converting the calibration scale marks and the scales into the impact depth of the falling hammer 2. And (5) carrying out multi-point calibration, gradually improving the precision to millimeter level, and obtaining the correlation between the impact depth and the compactness. After calibration is finished, the device is moved to a region to be detected, the locking device is used for locking the drop hammer at the same height, then the locking switch is loosened, the drop hammer releases the drop hammer 2 along the slide way without initial speed, soil body is impacted, impact depth is recorded, and compaction degree is detected.
Based on the device provided by the above, after the point measurement is carried out at multiple positions, the compaction degree of multiple points can be measured, so that the roadbed compaction condition is further reflected, and the purpose of rapidly detecting the compaction degree of the road-fill roadbed is achieved.
In another preferred embodiment, considering the problem of detection of a ground surface with a slope, when the ground surface has a slope, the upper detection device is placed on the bottom surface to incline, so that the falling hammer does not fall vertically, and the detection result is inaccurate. In order to solve the problem of rapid measurement of compactness on a slope surface and ensure that the device has the same gravity component on slope surfaces with different angles, in the embodiment, a square water tank which is provided with scales and can be filled with water is arranged behind a drop hammer, the continuous adjustment of the quality is ensured, wherein the height formula of the water level in the water tank is as follows,
Figure DEST_PATH_GDA0002249787790000041
in the formula
D is a predetermined impact force
m is the mass of the drop hammer and the water tank
Δ m is the mass of injected water
R is the length of the inside of the water tank
Theta is the angle of the slope
The water tank can be arranged on the calibration rod 21, or on the drop hammer or the counterweight, and by adopting the scheme, when the ground has a slope, the vertical component of the drop speed of the drop hammer can still reach a preset value. Preferably, the water tank can be a cylindrical structure or a cubic structure or other structures, so that the center of gravity is ensured to be on the axis of the calibration rod 21, and the water filling and draining structure of the water tank adopts a conventional known structure, which is not described herein again.
In a more preferred scheme, according to the principle, the water tank is provided with scale marks with different colors according to the inclination angle of the ground in advance, so that the problem of field calculation is avoided, and the method is simpler and more direct. Specifically, the water tank is of a transparent structure, the scale marks can surround the water tank for a circle or a half circle, when the device is placed on the ground, the scale marks parallel to the water level in the water tank are the preset water level to be reached, water can be injected if the water level is insufficient, and water can be discharged if the water level is exceeded. It will be appreciated that the different graduations are horizontal corresponding to different angles of the device when the device is placed at that angle. Therefore, the scale marks are of a mutually crossed structure on the water tank and are distinguished by different colors. In an optimal scheme, in order to avoid that the scale marks interfere with reading due to the fact that a plurality of scale marks are crossed, the setting positions of different scale marks are different, and therefore the crossing is avoided as much as possible.
Wherein, preferably, the ground slope range is within 15 degrees, and the ground is required to be leveled and measured after exceeding the degree. The graduation marks correspond to one without a 2 degree shift, more preferably, one with a 1 degree shift. Therefore, the requirement on the levelness of the ground is not too high, the time and the cost can be saved, and the measuring efficiency is improved.
In a more preferable scheme, in order to make the difference of the scale marks more obvious, the water tank can be arranged in a conical structure with a small upper part and a big lower part. Because the water level is of a conical structure, when the water level is inclined, the water level is slightly changed (by analyzing the principle, the vertical section of a cavity above the water surface is of a triangular structure by taking a small cone as an example, the water surface is still kept horizontal when the water level is inclined, so the length of the bottom edge of the horizontal triangle is increased, the larger the conical degree of the cone is, the larger the change of the length of the vertical section of the water surface is, and the larger the height of the triangular cavity is, because the area of the triangle is equal to the bottom edge multiplied by the height, the water level is obviously changed), when the water amount is increased, the difference between the water level and the horizontal water level is more obvious, therefore, the position change of the scale mark is obvious, and the interference of the scale mark is avoided. The water tank structure does not necessarily adopt a regular structure, and can be a special-shaped structure, so long as the volume is ensured to be larger and larger from bottom to top, and the change rate is larger and better, so that the change of the position of the scale mark is obvious when the water tank structure inclines.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (9)

1. An apparatus for rapidly detecting compaction of a road bed, the apparatus comprising: the device comprises a falling barrel and a falling hammer, wherein the falling hammer is arranged in the falling barrel, and the device is characterized in that a frame and a handrail are arranged on the outer side of the falling barrel, a limiting slideway and a locking device are arranged in the falling barrel, and a glass scale plate is arranged at the lower part of the falling barrel; the drop hammer is characterized in that the hammer head is conical, and the rear end of the drop hammer head can be connected with a calibration rod and a counterweight limiting rod piece; the calibration rod can be connected with the falling hammer through a screw, and the counterweight limiting rod piece can be connected with the counterweight.
2. The apparatus for rapidly testing the compaction of a road subgrade according to claim 1, wherein the inner diameter of said drop barrel is 10-15cm and the height is within the range of 100-120 cm.
3. The apparatus for rapidly testing the compaction of a road bed according to claim 1, wherein a limit slide and a locking device are provided in the dropping barrel to make the dropping hammer drop without initial speed.
4. The apparatus for rapidly testing the compaction of a road bed according to claim 1, wherein the material of the dropping barrel is a steel pipe.
5. The apparatus for rapidly testing the compaction degree of a road bed according to claim 1, wherein the sidewall of the dropping barrel is provided with a vertical hole, and a glass scale plate is arranged at the hole.
6. The apparatus for rapidly testing the compaction degree of a road bed according to claim 1, wherein a calibration bar is connected after the drop hammer.
7. The apparatus for rapidly testing the compaction degree of a road bed according to claim 1, wherein a weight limit rod is connected to the rear of the drop hammer.
8. The apparatus for rapidly testing the compaction of a road bed according to claim 1, wherein the shape of the drop hammer is a right circular cone.
9. The apparatus for rapidly testing the compaction degree of a road bed according to claim 1, wherein the calibration rod is provided with calibration graduation lines.
CN201920310035.3U 2019-03-12 2019-03-12 Device for rapidly detecting compaction degree of road filling foundation Active CN210163876U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109763476A (en) * 2019-03-12 2019-05-17 上海兰德公路工程咨询设计有限公司 A kind of device and method of the compactness of quick detection fill subgrade

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109763476A (en) * 2019-03-12 2019-05-17 上海兰德公路工程咨询设计有限公司 A kind of device and method of the compactness of quick detection fill subgrade

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