Construction project foundation bearing capacity detection device

Abstract

The utility model discloses a construction project foundation bearing capacity detection device, which comprises a sounding rod, a driving hammer and a sleeve, the sounding rod is provided with a limit ring, the lower end of the sounding rod is in threaded connection with a retaining buckle, the driving hammer is sleeved outside the sounding rod, the driving hammer is of a split structure and is connected through a bolt, the sleeve is movably provided with a plurality of balls, and the balls are in threaded connection with the retaining buckle. The outer part of the sleeve is connected with a protective cylinder, and the ball is in rolling connection with the sounding rod; when the driving hammer moves downwards along the sounding rod, the ball rotates to reduce the falling frictional resistance of the driving hammer, so that the impact force of the driving hammer is not easily influenced by the frictional force, the precision of a measurement result can be improved, whether the sounding rod is vertically placed on a foundation or not can be checked through the circular gradienter on the limiting ring, and the vertical falling of the driving hammer can be conveniently confirmed; excessive inclination of the feeler lever is prevented, and measurement errors are reduced.

Description

Technical Field

[0001] This utility model relates to the field of foundation testing technology, specifically a device for testing the bearing capacity of foundations in construction projects. Background Technology

[0002] Dynamic penetration test is one of the methods for testing the bearing capacity of foundations. It uses a calibrated hammer to strike the foundation soil layer vertically, and estimates the allowable bearing capacity of the soil layer based on the number of hammer blows required for the probe to penetrate the foundation soil layer.

[0003] Among related technologies, a search revealed a solution for a lightweight power penetrometer (publication number CN222834865U). The through-hole provided by the snap-fit ​​hammer pad allows the mating ends of the penetrometer rod and slide rod to be inserted. After the penetrometer rod and slide rod are connected, the through-hole provides a limiting space at the joint, preventing deformation and damage to the connection. This design is highly practical. Furthermore, the snap-fit ​​hammer pad and penetrometer rod are detachably connected, ensuring that the impact force of the hammer is directly applied to the penetrometer rod through the snap-fit ​​hammer pad. This structure also facilitates the replacement or addition of the penetrometer rod.

[0004] However, in the above scheme, the center of the hammer has an opening slightly larger than the slide bar. When the hammer falls, it rubs against the slide bar, affecting the hammer's striking force and causing a large deviation in the measurement results. Utility Model Content

[0005] The purpose of this invention is to provide a foundation bearing capacity testing device for construction projects to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a foundation bearing capacity testing device for construction projects, comprising a probe rod, a limiting ring provided on the probe rod, and a stop buckle screwed to the lower end of the probe rod. The distance between the limiting ring and the stop buckle is fixed, which can ensure that the hammer rises to a consistent height, which is beneficial to improving the test results.

[0007] A hammer, which is fitted over the probe rod, is a separate structure connected by bolts.

[0008] The sleeve has several ball bearings movably mounted on it, and a protective cylinder is connected to the outside of the sleeve. The ball bearings are in rolling connection with the probe rod. The ball bearings reduce the frictional resistance of the falling hammer, ensuring stable impact force and more accurate measurement results.

[0009] Furthermore, a circular level is installed on the surface of the limiting ring. The level can be used to check whether the probe rod is perpendicular to the ground, which makes it easier to judge the placement accuracy of the probe rod.

[0010] Furthermore, the sleeve surface is provided with several limiting holes, and the ball bearings are placed inside the limiting holes to prevent the ball bearings from moving freely and to ensure that the ball bearings are arranged in an orderly manner.

[0011] Furthermore, the protective cylinder is connected to a screw that connects to the sleeve, and a sealing ring is provided inside the protective cylinder. The sealing ring can reduce the leakage of lubricating oil, ensure smooth rotation of the ball bearings, and prevent jamming.

[0012] Furthermore, the retaining clip is screwed with an extension rod, and the extension rod is screwed with a probe, which can be used to test deeper parts as needed.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) When the hammer moves down along the probe rod, the rotation of the ball can reduce the frictional resistance of the hammer falling, ensuring that the impact force of the hammer is not easily affected by friction, which can improve the accuracy of the measurement results.

[0015] (2) The circular level on the limiting ring can be used to check whether the probe rod is placed vertically on the foundation, which makes it easy to confirm that the hammer falls vertically, prevent the probe rod from tilting too much, and reduce measurement errors.

[0016] (3) The sealing ring can achieve the sealing of the protective cylinder and the sleeve. The protective cylinder is filled with lubricating oil to prevent lubricating oil leakage. The long-term lubrication effect is good. The hammer can be disassembled for easy replenishment of lubricating oil. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the connection between the hammer and the probe rod of this utility model;

[0018] Figure 2 This is a top view of the hammer of this utility model;

[0019] Figure 3 This is a cross-sectional view of the hammer of this utility model;

[0020] Figure 4 This is a cross-sectional view of the protective cylinder of this utility model;

[0021] Figure 5 This is a schematic diagram showing the disassembled parts of this utility model.

[0022] In the diagram: 1. Hammer; 2. Handle; 3. Penetrometer rod; 4. Stop; 5. Probe; 6. Limiting ring; 7. Circular level; 8. Screw plate; 9. Bolt; 10. Ball bearing; 11. Sleeve; 12. Extension rod; 13. Limiting hole; 14. Sealing ring; 15. Screw; 16. Protective sleeve; 17. Insertion hole; 18. Stop. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0024] Please see Figure 1-5 This utility model provides a technical solution: a foundation bearing capacity testing device for construction projects, including a probe rod 3, a limiting ring 6 on the probe rod 3, and a stop buckle 4 screwed to the lower end of the probe rod 3. The limiting ring 6 can limit the rising height of the hammer 1 to ensure that the rising height of the hammer 1 is consistent each time. The stop buckle 4 is hit by the hammer 1 to ensure that the impact force is consistent each time.

[0025] Hammer 1 is fitted over the probe rod 3. Hammer 1 is a split structure and is connected by bolts 9. When hammer 1 is disassembled, the lubrication of ball bearing 10 can be checked and lubricating oil can be added.

[0026] The sleeve 11 has several balls 10 movably mounted on it. A protective cylinder 16 is connected to the outside of the sleeve 11. The balls 10 are tumbling connected to the probe rod 3. There is a gap between the balls 10 and the probe rod 3. During the fall of the hammer 1, the contact time between the balls 10 and the probe rod 3 can be reduced, which helps to reduce the falling resistance of the hammer 1.

[0027] In this embodiment, as Figure 1 As shown, a circular level 7 is installed on the surface of the limiting ring 6. The circular level 7 can determine whether the probe rod 3 is placed vertically, which makes it easier for the operator to adjust the probe rod 3.

[0028] In this embodiment, as Figure 1 As shown, the hammer 1 has two or four handles 2 screwed onto its surface. Using the handles 2 makes it easier to lift the hammer 1 and reduces effort. Two handles are suitable for a 10kg light hammer; four handles are suitable for a 63.5kg heavy hammer.

[0029] In this embodiment, as Figure 1 and Figure 2 As shown, the hammer 1 has an arc groove on its surface, and a screw hole plate 8 is provided inside the arc groove. The bolt 9 is screwed to the screw hole plate 8. By unscrewing the two bolts 9, the hammer 1 can be disassembled and the protective cylinder 16 can be removed.

[0030] In this embodiment, as Figure 4As shown, the sleeve 11 has several limiting holes 13 on its surface. The ball bearings 10 are placed inside the limiting holes 13 to ensure that the ball bearings 10 are arranged in an orderly manner. There can be six ball bearings 10, with three ball bearings on each side and arranged in a ring.

[0031] In this embodiment, as Figure 4 As shown, the protective cylinder 16 is connected to the sleeve 11 by a screw 15. The protective cylinder 16 and the sleeve 11 can be separated by unscrewing the screw 15. The protective cylinder 16 is provided with a sealing ring 14. Lubricating oil is added between the protective cylinder 16 and the sleeve 11. The sealing ring 14 can prevent the leakage of lubricating oil, which prolongs the lubrication time of the ball 10 and extends the maintenance cycle.

[0032] In this embodiment, as Figure 5 As shown, the retainer 4 is screwed with an extension rod 12, and the extension rod 12 is screwed with a probe 5. The two ends of the extension rod 12 are a threaded head and a threaded hole, respectively. The probe 5 can be screwed into the threaded hole to increase the detection depth.

[0033] In this embodiment, as Figure 3 As shown, the hammer 1 has a socket 17 in the middle, and a stop 18 is provided inside the socket 17. The stop 18 locks the protective cylinder 16, thereby achieving the positioning and installation of the protective cylinder 16.

[0034] Specifically, in use, hammer 1 is fitted onto probe rod 3, stop 4 is screwed onto probe rod 3, extension rod 12 is screwed onto stop 4, probe 5 is screwed onto extension rod 12, probe 5 is aligned with the measurement position on the foundation, check circular level 7 and adjust probe rod 3 to ensure probe rod 3 is in a vertical position, use handle 2 to lift hammer 1 to contact limit ring 6, release handle 2, hammer 1 falls, at this time it contacts probe rod 3 instead of hammer 1, ball bearing 10 rotates to reduce the falling resistance of hammer 1. Since there is a gap between ball bearing 10 and probe rod 3, during the falling process of hammer 1, ball bearing 10 is not in contact with probe rod 3 for a period of time, which can better reduce resistance;

[0035] When hammer 1 strikes stop 4, the kinetic energy generated by the free fall of hammer 1 causes probe 5 to penetrate into the foundation. Hammer 1 falls freely from a fixed height, and the impact force is transmitted to probe 5, causing probe 5 to penetrate into the soil layer of the foundation. During the penetration process of probe 5, the soil resistance is inversely proportional to the number of hammer blows (N value): the denser or stronger the soil layer, the fewer the number of hammer blows. By recording the number of hammer blows to a certain penetration depth, the mechanical properties and density of the foundation can be determined.

[0036] For a specific example: The total weight of hammer 1 and related components is 10kg; the drop height of hammer 1 is 50cm; the diameter of probe 5 is 40mm and the cone angle is 60°; the bearing capacity of the foundation (kPa) is (0.8×N-2)×9.8 m / s². 2Where N is the number of hammer blows required to insert probe 5 into the ground 30cm, which is taken as 5, and the bearing capacity of the foundation is calculated to be 19.6kPa;

[0037] When using the additional extension rod 12, loosen the retaining clip 4 to separate it from the current extension rod 12, screw the additional extension rod 12 into the extension rod 12 inserted into the foundation, and then screw the retaining clip 4 into the additional extension rod 12 to increase the detection depth.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the bearing capacity of foundation soil in construction projects, characterized in that, include: The probe rod (3) is provided with a limiting ring (6) and a stop buckle (4) is screwed to the lower end of the probe rod (3). Hammer (1), the hammer (1) is sleeved on the outside of the probe rod (3), the hammer (1) is a split structure and is connected by bolts (9); A sleeve (11) is provided with several ball bearings (10) movably mounted on it. A protective sleeve (16) is connected to the outside of the sleeve (11). The ball bearings (10) are tumbled to the probe rod (3).

2. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: A circular level (7) is mounted on the surface of the limiting ring (6).

3. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The hammer (1) has two or four handles (2) screwed onto its surface.

4. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The hammer (1) has an arc groove on its surface, and a screw hole plate (8) is provided inside the arc groove. The bolt (9) is screwed to the screw hole plate (8).

5. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The sleeve (11) has several limiting holes (13) on its surface, and the ball (10) is placed inside the limiting holes (13).

6. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The protective cylinder (16) is connected to a screw (15) that is connected to the sleeve (11), and a sealing ring (14) is provided inside the protective cylinder (16).

7. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The buckle (4) is screwed with an extension rod (12), and the extension rod (12) is screwed with a probe (5).

8. The foundation bearing capacity testing device for construction projects according to claim 1, characterized in that: The hammer (1) has a socket (17) in the middle, and a stop (18) is provided inside the socket (17), which locks the protective cylinder (16).

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