Extra-large reducing high-strain hammering device

Abstract

The utility model discloses an extra-large variable-diameter high-strain hammering device which comprises a bottom hammer, a middle hammer is arranged above the bottom hammer, a high-strength plate is installed on the lower end face of the bottom hammer, connecting grooves of T-shaped structures are formed in the bottom hammer and the middle hammer at equal angles, protruding blocks are fixed to the bottom hammer and the middle hammer at equal angles, and the protruding blocks are fixed to the bottom hammer and the middle hammer. A locking bolt is connected into the connecting groove, the locking bolt is connected with a nut through threads, a fixing rod is arranged on the outer side of the connecting groove, and lifting lugs are fixed to the upper end face of the bottom hammer and the upper end face of the middle hammer. According to the extra-large variable-diameter high-strain hammering device, the bottom hammer is subjected to variable-diameter treatment, so that a pile head is perfectly attached to the hammer body, total cross-section contact of the pile head and the hammer body is guaranteed, stress concentration is avoided, the pile head can be protected against damage through total cross-section contact, excellent and accurate data can be tested, a circular cross section is formed on the whole, and high-strain hammering is achieved. And the interface is the same as the pile foundation, no unfilled corner exists, and the phenomena of damage, corner falling, cracking and the like of the pile foundation during hammering are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering infrastructure detection, in particular to an extra-large variable diameter high-strain hammer device. Background Art

[0002] Pile foundation is an underground hidden structure. Various defects are unavoidable during the construction process due to various reasons. High strain method is a reliable method to determine the ultimate bearing capacity of a single pile. Compared with static load, it is not only light in equipment, fast in detection speed and low in cost, but also has many functions that static load test piles do not have. It provides strong technical support for the acceptance of pile foundation projects. Its advantages have been recognized by everyone. However, the high strain method is more difficult to detect, and the detection accuracy is not as direct as that of the static load method. It is greatly affected by the test specifications and detection atmosphere.

[0003] At present, the small, medium and large tonnage testing market generally uses square hammers. The use of square hammers for bearing capacity testing of round piles is seriously inconsistent in terms of structural stress, and the square hammer has stress concentration at the four corners, which is easy to cause local stress concentration and stress diffusion on the pile foundation, and cause cracking, damage, collapse, etc. at the top of the pile foundation, resulting in test termination, wire breakage, sensor damage, etc.

[0004] Therefore, in view of the above problems, an extra-large variable diameter high strain hammer device is designed to better meet the actual use needs. Utility Model Content

[0005] The utility model aims to provide a large variable diameter high strain hammer device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an extra-large variable diameter high strain hammer device, comprising a bottom hammer, a middle hammer is arranged above the bottom hammer, a high-strength plate is installed on the lower end face of the bottom hammer, "T"-shaped connecting grooves are opened at equal angles on the bottom hammer and the middle hammer, protrusions are fixed at equal angles on the bottom hammer and the middle hammer, a locking bolt is connected in the connecting groove, the locking bolt is connected to the nut through a thread, a fixing rod is arranged on the outer side of the connecting groove, and ears are fixed on the upper end faces of the bottom hammer and the middle hammer.

[0007] Preferably, the bottom hammer and the middle hammer are both steel casting structures, and both the bottom hammer and the middle hammer are cylindrical structures, and the lower end surface of the bottom hammer is reduced in diameter. The steel casting structure can ensure the strength of the bottom hammer and the middle hammer, avoid damage to the bottom hammer and the middle hammer during the experiment, and extend the service life of the device.

[0008] Preferably, a positioning rod is fixed to the upper end of the high-strength plate, and the positioning rod and the bottom hammer are nested and connected. The high-strength plate is locked with the bottom hammer by a fixing bolt, and the positioning rod is used to facilitate positioning of the high-strength plate to ensure the installation position of the high-strength plate.

[0009] Preferably, a groove is provided on the lower end surface of the middle hammer, and the groove is nested with the lifting ear on the bottom hammer. The bottom hammer and the middle hammer can be easily assembled by nesting the groove with the lifting ear on the bottom hammer.

[0010] Preferably, there are six locking bolts and nuts distributed at equal angles about the center of the bottom hammer, and the bottom hammer and the middle hammer can be locked by the locking bolts and nuts. The stability of the connection between the bottom hammer and the middle hammer can be ensured by the above-mentioned bolt tightening mechanism.

[0011] Preferably, a clamping block is symmetrically fixed on the fixing rod, and the clamping block and the connecting groove are nested, and the clamping block and the locking bolt head are snap-fitted, and the clamping block and the nut are also snap-fitted. The locking bolt and the nut can be locked by the action of the clamping block to prevent the locking bolt and the nut from loosening due to impact force during the experiment.

[0012] Preferably, the fixing rod is also symmetrically slidably connected to a limiting rod in an up-and-down manner, and the limiting rod and the protrusion are nested. The nesting effect between the limiting rod and the protrusion ensures the stability of the fixing rod installation.

[0013] Preferably, a lever is fixed to the lower end of the limit rod, and the lever passes through the fixed rod and can slide up and down. One end of a spring is fixed to the lower end of the limit rod, and the other end of the spring is fixed in the fixed rod. Through the action of the spring, basic protection can be provided for the disassembly and assembly of the fixed rod.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the extra-large variable diameter high strain hammer device, by reducing the diameter of the bottom hammer, makes the pile head and the hammer body fit perfectly, ensuring the full-section contact between the pile head and the hammer body, thereby avoiding stress concentration. The full-section contact can not only protect the pile head from damage, but also can test excellent and accurate data. The overall circular cross-section is the same as the pile foundation interface, without missing corners, and effectively avoids damage, corner loss, cracking, etc. of the pile foundation during hammering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the exploded three-dimensional structure of the overall composition of the device of the utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of the device of the utility model;

[0017] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0018] Figure 4 It is a schematic diagram of the front view cross-section of the three-dimensional structure of the bottom hammer and the middle hammer of the utility model;

[0019] Figure 5 It is a schematic diagram of the partial cross-section of the three-dimensional structure of the fixing rod of the utility model.

[0020] In the figure: 1. bottom hammer; 2. high-strength plate; 201. positioning rod; 202. fixing bolt; 3. middle hammer; 301. groove; 4. connecting groove; 5. protrusion; 6. locking bolt; 7. nut; 8. fixing rod; 801. clamping block; 9. limiting rod; 901. lever; 902. spring; 10. lifting ear. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 5 The utility model provides a technical solution: an extra-large variable diameter high strain hammer device, comprising a bottom hammer 1, a middle hammer 3 is arranged above the bottom hammer 1, a high-strength plate 2 is installed on the lower end surface of the bottom hammer 1, and "T"-shaped connecting grooves 4 are opened at equal angles on the bottom hammer 1 and the middle hammer 3. Bumps 5 are fixed at equal angles on the bottom hammer 1 and the middle hammer 3. A locking bolt 6 is connected in the connecting groove 4, and the locking bolt 6 is connected to a nut 7 through a thread. A fixing rod 8 is arranged on the outer side of the connecting groove 4, and lifting ears 10 are fixed on the upper end surfaces of the bottom hammer 1 and the middle hammer 3.

[0023] A positioning rod 201 is fixed to the upper end of the high-strength plate 2, and the positioning rod 201 and the bottom hammer 1 are nested and connected, and the high-strength plate 2 is locked with the bottom hammer 1 by a fixing bolt 202;

[0024] When using this extra-large variable diameter high strain hammer device, if Figure 1-Figure 5 As shown, the bottom hammer 1 and the middle hammer 3 can be used as separate hammers to meet the inspection requirements of small and medium-sized pile foundations. When the bottom hammer 1 or the middle hammer 3 is used alone, the high-strength plate 2 can be installed and fixed by cooperating with the bottom hammer 1 or the middle hammer 3 through the fixing bolt 202. The high-strength plate 2 can achieve a protective effect to prevent the bottom hammer 1 or the middle hammer 3 from directly contacting the pile foundation during the inspection process, thereby ensuring the service life of the device.

[0025] The bottom hammer 1 and the middle hammer 3 are both steel casting structures, and the bottom hammer 1 and the middle hammer 3 are both cylindrical structures, and the lower end surface of the bottom hammer 1 is reduced in diameter; a groove 301 is provided on the lower end surface of the middle hammer 3, and the groove 301 is nested and connected with the upper ear 10 of the bottom hammer 1; there are six locking bolts 6 and nuts 7 distributed at equal angles about the center of the bottom hammer 1, and the bottom hammer 1 and the middle hammer 3 can be locked by the locking bolts 6 and nuts 7; a clamping block 801 is also fixed symmetrically on the fixing rod 8, and the clamping block 801 is connected to the connecting The grooves 4 are nested, and the block 801 is snap-fitted with the head of the locking bolt 6, and the block 801 is snap-fitted with the nut 7; the fixed rod 8 is also symmetrically slidably connected with a limit rod 9, and the limit rod 9 and the protrusion 5 are nested; a lever 901 is fixed at the lower end of the limit rod 9, and the lever 901 penetrates the fixed rod 8 and can slide up and down, and one end of a spring 902 is fixed at the lower end of the limit rod 9, and the other end of the spring 902 is fixed in the fixed rod 8;

[0026] When it is necessary to test a very large pile foundation, such as Figure 1-Figure 5 As shown, the middle hammer 3 is lifted by a crane, and the positioning assembly of the bottom hammer 1 and the middle hammer 3 can be achieved by cooperating with the nesting effect between the groove 301 and the lifting ear 10 on the bottom hammer 1, ensuring that the center of gravity of the bottom hammer 1 and the middle hammer 3 are in the same straight line. After the assembly is completed, the assembled bottom hammer 1 and the middle hammer 3 can be locked by the locking bolt 6 and the nut 7 in cooperation with the connecting groove 4 of the "T" structure to ensure the stability of the assembly of the bottom hammer 1 and the middle hammer 3. An extra-large hammer is formed by combining the bottom hammer 1 and the middle hammer 3 to meet the detection requirements of extra-large pile foundations. After the assembly is completed, in order to avoid the loosening of the locking bolt 6 and the nut 7 caused by the impact during the detection process, the clamping block 801 can be nested with the connecting groove 4. The upper block 801 is engaged with the nut 7, and the lower block 801 is engaged with the head of the locking bolt 6, thereby realizing the locking effect of the locking bolt 6 and the nut 7, and effectively avoiding loosening. When installing the block 801, the limit rod 9 is driven downward by pressing the lever 901 until the limit rod 9 is completely retracted into the fixing rod 8, thereby ensuring the normal installation of the block 801. After the installation is completed, the lever 901 is loosened. At this time, the limit rod 9 can be reset and nested with the protrusion 5 under the elastic action of the spring 902, thereby realizing the locking effect of the fixing rod 8 and ensuring the stability of the installation of the fixing rod 8. This is the working principle of the extra-large variable diameter high strain hammering device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large variable diameter high strain hammer device, comprising a bottom hammer (1), a middle hammer (3) being arranged above the bottom hammer (1), characterized in that: A high-strength plate (2) is installed on the lower end surface of the bottom hammer (1), and a "T"-shaped connecting groove (4) is opened at an equal angle on the bottom hammer (1) and the middle hammer (3). Bumps (5) are fixed at an equal angle on the bottom hammer (1) and the middle hammer (3). A locking bolt (6) is connected in the connecting groove (4), and the locking bolt (6) is connected to a nut (7) through a thread. A fixing rod (8) is arranged on the outer side of the connecting groove (4), and lifting ears (10) are fixed on the upper end surfaces of the bottom hammer (1) and the middle hammer (3).

2. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: The bottom hammer (1) and the middle hammer (3) are both steel casting structures, and both the bottom hammer (1) and the middle hammer (3) are cylindrical structures, and the lower end surface of the bottom hammer (1) is reduced in diameter.

3. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: A positioning rod (201) is fixed to the upper end of the high-strength plate (2), and the positioning rod (201) and the bottom hammer (1) are nested and connected, and the high-strength plate (2) is locked with the bottom hammer (1) via a fixing bolt (202).

4. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: The lower end surface of the middle hammer (3) is provided with a groove (301), and the groove (301) is nested and connected with the upper lifting ear (10) of the bottom hammer (1).

5. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: There are six locking bolts (6) and nuts (7) distributed at equal angles about the center of the bottom hammer (1), and the bottom hammer (1) and the middle hammer (3) can be locked by the locking bolts (6) and nuts (7).

6. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: A clamping block (801) is also fixed symmetrically on the fixing rod (8) in an upper and lower manner, and the clamping block (801) and the connecting groove (4) are nested and connected, and the clamping block (801) and the head of the locking bolt (6) are snap-fitted and connected, and the clamping block (801) and the nut (7) are also snap-fitted and connected.

7. The ultra-large variable diameter high strain hammer device according to claim 1, characterized in that: The fixing rod (8) is also symmetrically slidably connected to a limiting rod (9) in an up-and-down manner, and the limiting rod (9) and the protrusion (5) are nestedly connected.

8. The ultra-large variable diameter high strain hammer device according to claim 7, characterized in that: A lever (901) is fixed to the lower end of the limiting rod (9), and the lever (901) passes through the fixing rod (8) and can slide up and down. One end of a spring (902) is fixed to the lower end of the limiting rod (9), and the other end of the spring (902) is fixed in the fixing rod (8).

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