Rapid hole forming device for highway subgrade pressure density detection

Abstract

The utility model discloses a rapid pore-forming device for highway subgrade pressure density detection, which comprises a pressing assembly, a handrail and a pore-forming assembly, the pressing assembly is arranged on the handrail, the pore-forming assembly is arranged at the bottom of the handrail, the pore-forming assembly comprises a sleeve and a cutting ring, the sleeve is arranged at the bottom of the handrail, and the cutting ring is arranged at the bottom of the sleeve. The handrail comprises limiting rods and hit blocks, the limiting rods are arranged on the two sides of the bottom of the handrail and connected with the handrail in a welded mode, the hit blocks are arranged between the limiting rods on the two sides of the bottom of the handrail, a top plate is arranged on the top of the sleeve, and the top plate of the sleeve is arranged at the bottoms of the limiting rods and connected with the bottoms of the limiting rods in a welded mode. According to the device, the drop hammer freely falls downwards or applies downward acting force to hammer the top of the sleeve, the sleeve and the cutting ring are cut into a soil layer, hole forming operation is completed, operation is easy, time and labor are saved, efficiency is high, the safety coefficient is high, and potential safety hazards do not exist.

Description

Technical Field

[0001] The present utility model relates to the technical field of rapid hole-forming devices for highway detection, and specifically relates to a rapid hole-forming device for detecting the compaction density of highway subgrades. Background Technique

[0002] According to the provisions of Articles 4.4.3 - 4.4.4 of the "Technical Specification for Highway Subgrade Construction" (JTG / T 3610-2019), the compaction degree of soil subgrades shall comply with the provisions of Table 4.4.3 of this specification, and the compaction degree of each compaction layer shall be detected during the construction of fill embankments. The detection frequency is not less than 2 points per 1000 m 2 During the old road subgrade upgrade and reconstruction survey and design, the compaction degree of the old road subgrade in the utilized section should also be detected and analyzed to timely discover whether the compaction degree of the utilized section subgrade meets the requirements of the subgrade compaction degree after the upgrade and reconstruction specified in the specifications. If it does not meet the requirements, secondary construction can be carried out to ensure that the subgrade compaction degree meets the requirements and improve the overall stability of the subgrade. Therefore, subgrade compaction degree detection is a frequently used detection method in highway subgrade construction and old road upgrade and reconstruction design, with a high usage frequency.

[0003] However, currently, when determining the compaction degree by the method of digging pits and filling them with sand to test the compaction degree according to Section T0921-2019 of the "Field Test Procedures for Highway Subgrade and Pavement" (JTG 3450-2019), since the most primitive method of hole-forming is used when measuring the volume of the pit during digging, that is, hole-forming is carried out by manually hitting with a chisel and a hammer. The entire hole-forming process is time-consuming, laborious, and has a relatively high safety risk. Usually, it takes at least more than 1 hour to form a hole, and the person hitting the hammer is prone to fatigue and soreness in the hand. During the process of hitting the chisel, the hammer is extremely likely to hit the hand, posing a great safety hazard. At least, it may cause bleeding, and at worst, there is a possibility of fracture in the palm or arm. In addition, the dug-out soil is easily splashed and lost, affecting the test accuracy. When using the device of the present invention for hole-forming, the above problems can be completely avoided. There is no need for a chisel and a hammer. By lifting the drop hammer to a certain height with the lifting handle and then letting it freely fall to hit the sleeve, the purpose of hole-forming can be achieved. The hole-forming speed is fast, and it generally only takes more than ten minutes to form a hole. This method is fast, efficient, time-saving, labor-saving, has no safety hazards, and has higher test accuracy.

[0004] According to the provisions of the "Field Test Procedures for Highway Subgrade and Pavement" (JTG 3450-2019), Section T0921-2019 for the method of testing compaction degree by digging pits and filling with sand, in order to evaluate the compaction quality of the subgrade structural layer, the compaction degree of the subgrade, including the base course or sub-base course, and the subgrade structure of the gravel pavement, should be tested on-site. However, when currently using the method in Section T0921-2019 to test the compaction degree, first, a pit should be dug at the designated test location, and the volume of the pit is measured by filling it with sand, and then the compaction degree is measured according to the steps of the test method. However, when digging the pit, there is currently no fast, efficient, and highly safe method. It can only be done by using a chisel and a hammer and manually hitting hard to form a hole. The entire hole-forming process is time-consuming, laborious, and has a relatively high safety risk. That is, if the operation is improper, the hammer is easy to hit the hand, there is a safety hazard, and the dug-out soil is easy to splash out and be lost, affecting the test accuracy. However, by using the device of the present invention to form a hole, the above problems can be completely avoided. When using this device to form a hole, a chisel and a hammer are not needed, and it is fast, efficient, labor-saving, has no safety hazard, and the loosened soil is retained in the device and will not splash out and be lost, and the test accuracy is higher. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present utility model provides a rapid hole-forming device for detecting the compaction density of highway subgrades, aiming to solve the problem that the most primitive method is currently used for hole-forming during compaction density detection, that is, the operator uses a chisel and a hammer to hit and form a hole, which is slow in hole-forming speed, very laborious, and requires frequent replacement of personnel to relieve arm fatigue.

[0006] To achieve the above object, the present utility model provides the following technical solution: A rapid hole-forming device for detecting the compaction density of highway subgrades, comprising a downward pressure component, a handrail, and a hole-forming component. The downward pressure component is provided on the handrail, and the hole-forming component is provided at the bottom of the handrail. The hole-forming component includes a sleeve and a core cutter. The sleeve is provided at the bottom of the handrail, and a core cutter is provided at the bottom of the sleeve. The sleeve and the core cutter are closely connected by a screw thread.

[0007] Furthermore, the handrail includes a limiting rod and a struck block. Limiting rods are provided on both sides of the bottom of the handrail, and the limiting rods are welded to the handrail. A struck block is provided between the limiting rods on both sides of the bottom of the handrail. The top plate of the sleeve is provided at the bottom of the limiting rod and is welded to the limiting rod.

[0008] Furthermore, an insertion hole is provided on the struck block.

[0009] Furthermore, the downward pressure component includes a drop hammer. Two through holes are provided on the drop hammer, and the through holes of the drop hammer are used to slide up and down around the two limiting rods.

[0010] Furthermore, a lifting rod is provided at the top of the drop hammer, and a handle is provided at the other end of the lifting rod. The lifting rod is welded to the drop hammer and the handle.

[0011] Further, a central hole is provided in the middle part of the top plate.

[0012] Further, the middle part of the armrest is hexagonal in shape.

[0013] Compared with the existing technology, the present utility model has the following beneficial effects:

[0014] (1) In the present utility model, the drop hammer freely falls downward or a downward acting force is applied to make the drop hammer fall downward to strike the top of the sleeve, cutting the sleeve and the ring knife into the soil layer to complete the hole-forming operation. The operation is simple, time-saving, labor-saving, efficient, and has a high safety factor without any safety hazards.

[0015] (2) In the present utility model, the ring knife connected by the sleeve is detachable and replaceable. The main wearing part of the whole device is the cutting function of the ring knife. When the device is used frequently and the number of uses reaches a certain amount, the cutting edge of the ring knife is prone to becoming blunt, the hole-forming speed will slow down, and the efficiency will decrease. By disassembling and replacing a new ring knife, the hole-forming speed can be increased, thereby improving the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structure diagram of the device of the present utility model.

[0017] Figure 2 It is a plan structure diagram of the device of the present utility model.

[0018] Reference numerals in the drawings: 1, handle; 2, armrest; 21, limiting rod; 22, impacted block; 23, insertion hole; 3, lifting rod; 4, drop hammer; 41, through hole; 5, sleeve; 501, top plate; 51, central hole; 6, ring knife. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] As Figure 1-2 shown; the present utility model provides a technical solution: a rapid hole-forming device for detecting the compaction density of a highway subgrade, including a downward pressing assembly, an armrest 2, and a hole-forming assembly. The downward pressing assembly is provided on the armrest 2, and the hole-forming assembly is provided at the bottom of the armrest 2. The hole-forming assembly includes a sleeve 5 and a ring knife 6. The sleeve 5 is arranged at the bottom of the armrest 2, and the ring knife 6 is provided at the bottom of the sleeve 5. The sleeve 5 and the ring knife 6 are hermetically connected by screw threads and are detachable.

[0020] Among them, the armrest 2 includes a limiting rod 21 and an impacted block 22. Limiting rods 21 are provided on both sides of the bottom of the armrest 2. The limiting rods 21 are welded to the armrest 2. An impacted block 22 is provided between the limiting rods 21 on both sides of the bottom of the armrest 2. The top plate 501 of the sleeve 5 is provided at the bottom of the limiting rod 21 and is welded to the limiting rod 21.

[0021] Among them, an insertion hole 23 is provided in the impacted block 22.

[0022] Among them, the pressing-down component includes a drop hammer 4. Two perforations 41 are formed in the drop hammer 4, and the perforations 41 of the drop hammer 4 are used to slide up and down around the periphery of two limiting rods 21.

[0023] Among them, a lifting rod 3 is provided at the top of the drop hammer 4. A lifting handle 1 is provided at the other end of the lifting rod 3. The lifting rod 3 is connected to the drop hammer 4 and the lifting handle 1 by welding.

[0024] Among them, a central hole 51 is formed in the middle part of the top plate 501.

[0025] Among them, the middle shape of the handrail 2 is hexagonal.

[0026] Workflow: The tester selects the compaction degree detection position. The detection position should have a flat surface and be cleaned. The area should be no less than the area of the compaction degree detection substrate. Place the substrate on a flat surface. The diameter of the central hole in the substrate is 200 MM. Then place the core cutter 6 at the hole-forming position located in the central hole of the substrate. After the position is determined, first, two staff members need to cooperate to complete the work. One person should firmly hold both ends of the handrail 2, steady and fix the position, and the other person should firmly hold the lifting handle 1 and pull it upward, so that when the lifting handle 1 is pulled upward, it drives the lifting rod 3 and the drop hammer 4 to move upward together. The drop hammer 4 moves upward along the periphery of the two limiting rods 21. After the drop hammer 4 moves to a certain height, release the lifting handle 1, so that the drop hammer 4 freely falls downward or apply a downward force to make the drop hammer 4 strike the top of the sleeve 5, cutting the sleeve 5 and the core cutter 6 into the soil layer. Repeat the above steps until the sleeve 5 and the core cutter 6 are cut into the soil base to a certain depth. Then the tester detects the hole-forming depth. After the tester detects the hole-forming depth and meets the technical requirements, stop the hammering, and gently lift the sleeve 5 and the core cutter 6 upward through the handrail 2. When it is difficult to lift, the handrail 2 can be pulled upward, pulling the lifting rod 3 and the drop hammer 4 upward through the handrail 2, so that the drop hammer 4 moves upward to the topmost position along the periphery of the two limiting rods 21. Then gently pull the drop hammer 4 upward, so that the drop hammer 4 gently strikes the struck block 22 at the bottom of the handrail 2, loosening the sleeve 5 and the core cutter 6 by knocking upward, so as to more easily lift the loosened sleeve 5 and the core cutter 6. After lifting the sleeve 5 and the core cutter 6, remove the loose soil in the hole, put it into a plastic bag and weigh it. Note that when lifting the loosened sleeve 5 and the core cutter 6 upward, the movement should not be too large to prevent the soil in the sleeve 5 and the core cutter 6 from splashing and flowing out. At the same time, use a brush to sweep the soil sticking to the inner and outer side walls of the loosened sleeve 5 and the core cutter 6 into the plastic bag to prevent it from flowing out.

[0027] Among them, the material of the lifting handle 1 is a stainless steel steel pipe, circular, with a diameter of 2 CM and a length of 20 CM;

[0028] The handrail 2 is made of cast iron, with a total length of 40 cm, a thickness of 1 cm. The two ends are long cubes, each with a length of 10 cm and a width of 2 cm. The middle section is a hexagonal cube, with the widest part having a length of 8 cm and a width of 6 cm. The insertion hole 23 of the impact block 22 has a diameter of 2.2 cm. The lifting rod 3 with a diameter of 2 cm can move freely in the insertion hole 23. There is a 1 mm gap between the hole wall of the insertion hole 23 and the lifting rod 3. When operating, the lifting rod can fall freely without friction. The impact block 22 is welded to the bottom of the handrail 2, starting from 4 cm from the top surface of the handrail 2 and 3 cm from the bottom surface, with an outer diameter of 5 cm and an inner diameter of 2.2 cm.

[0029] The lifting rod 3 is made of stainless steel pipe, with a diameter of 2 cm. The length of the lifting rod 3 connecting the handle 1 and the drop hammer 4 is 55 cm. The length of the two side limiting rods 21 connecting the handrail 2 and the sleeve 5 is 60 cm.

[0030] The drop hammer 4 is made of cast iron, solid, with a height of 15 cm and a diameter of 19.8 cm. The perforation 41 has a diameter of 2.2 cm. The drop hammer 4 weighs 10 - 15 Kg.

[0031] The sleeve 5 is made of stainless steel, with a height of 12 cm and an outer diameter of 19.8 cm. The wall thickness of the sleeve 5 is 2 mm. The upper top plate 501 has a thickness of 1 cm and is hollow in the middle. The outer diameter of the top plate 501 of the sleeve 5 is 19.8 cm, and the central hole 51 has a diameter of 8 cm. The welding connection position of the top plate 501 of the sleeve 5 with the handrail 2 and the lifting rod 3 is 2 cm from the edge of the sleeve.

[0032] The ring knife 6 is made of stainless steel, with an outer diameter of 19.8 cm, a wall thickness of 2 mm, a height of the annular thread of 2 cm, and the bottom of the ring knife 6 is a sharp edge with a height of 1 cm.

[0033] Although the embodiments of the present utility have been shown and described; for those of ordinary skill in the art; it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility; the scope of the present utility is defined by the appended claims and their equivalents.

Claims

1. A rapid hole-forming device for detecting the compaction density of a highway subgrade, comprising a downward pressing component, a handrail (2) and a hole-forming component, characterized in that: A pressing-down component is provided on the handrail (2), and a hole-forming component is provided at the bottom of the handrail (2). The hole-forming component includes a sleeve (5) and a core cutter (6). The sleeve (5) is arranged at the bottom of the handrail (2), a core cutter (6) is provided at the bottom of the sleeve (5), and the sleeve (5) and the core cutter (6) are closely connected by screw threads.

2. The rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 1, characterized in that: The handrail (2) includes a limiting rod (21) and a struck block (22). Limiting rods (21) are provided on both sides of the bottom of the handrail (2), and the limiting rods (21) are connected to the handrail (2) by welding. A struck block (22) is arranged between the limiting rods (21) on both sides of the bottom of the handrail (2). A top plate (501) is provided at the top of the sleeve (5), and the top plate (501) of the sleeve (5) is arranged at the bottom of the limiting rod (21) and connected by welding.

3. The rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 2, wherein: A penetrating hole (23) is formed in the struck block (22).

4. A rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 3, characterized in that: The pressing-down component includes a drop hammer (4). Two perforations (41) are formed in the drop hammer (4), and the perforations (41) of the drop hammer (4) are used to slide up and down around the two limiting rods (21).

5. The rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 4, wherein: A lifting rod (3) is provided at the top of the drop hammer (4), a lifting handle (1) is provided at the other end of the lifting rod (3), and the lifting rod (3) is connected to the drop hammer (4) and the lifting handle (1) by welding.

6. The rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 5, wherein: A central hole (51) is formed in the middle of the top plate (501).

7. The rapid hole-forming device for detecting the compaction density of a highway subgrade according to claim 6, characterized in that: The middle of the handrail (2) is hexagonal in shape.

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