Compaction hammer for preparing large remolded soil sample

Abstract

The utility model belongs to the technical field of geotechnical engineering, and particularly discloses a compaction hammer for preparing a large remolded soil sample, which comprises a compaction hammer framework and a compaction hammer body, the compaction hammer framework comprises a cylindrical rod and a bottom plate fixed at the bottom end of the cylindrical rod, and scales are arranged on the cylindrical rod; the compaction hammer body comprises a bottom hammer and a group of sub-hammers which are stacked on the bottom hammer and have different masses, a round hole is formed in the center of each of the bottom hammer and the sub-hammers, the compaction hammer body is inserted into the cylindrical rod through the round holes and clings to the bottom plate, and a fastener is arranged on the uppermost sub-hammer, so that the compaction hammer body and the compaction hammer framework are fixed. The compaction quality of the device can be adjusted according to actual requirements, and the structure is simple and practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering and particularly discloses a compacting hammer for preparing large-scale reshaped soil samples. Background Art

[0002] In geotechnical experiments, using undisturbed soil is crucial for preserving the soil's physical and chemical properties and obtaining more accurate experimental data. However, in indoor experiments or large-scale simulation studies, reconstituted soil is often used instead of undisturbed soil due to difficulties in sampling, transporting, and preserving undisturbed soil. Reconstituted soil is a soil sample with similar basic physical properties to those of the undisturbed soil, prepared by mixing and compacting the disturbed soil sample based on known basic physical properties.

[0003] Currently, the preparation methods of remolded soil samples are mainly divided into two categories: compaction method and consolidation method. The compaction method is to use a hammer of a certain mass to drop from a certain height to compact the soil sample to the designed height in one layer or layers; the consolidation method is to crush and screen the air-dried soil, and the obtained soil particles are fully mixed with distilled water to obtain a thin mud slurry slightly larger than the liquid limit, which is consolidated into a sample under vertical load. At present, the device for sample preparation using the compaction method relies on a compaction cylinder, and the remolded soil samples produced are small and cannot support large-scale geotechnical tests. On the other hand, the structure is simple, the weight of the compaction hammer is fixed and cannot be adjusted, and the applicable scenarios are limited. Utility Model Content

[0004] The utility model aims to provide an independently designed compaction hammer structure for preparing large reshaped soil samples and supporting large geotechnical experiments, solving the problems that the compaction weight of existing compaction devices cannot be adjusted and the reshaped soil samples produced are small.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A compacting hammer for preparing large reshaped soil samples, comprising a compacting hammer frame and a compacting hammer body;

[0007] The hammer frame includes a cylindrical rod and a base plate fixed to the bottom end of the cylindrical rod, and a scale is provided on the cylindrical rod;

[0008] The compacting hammer body includes a bottom hammer and a group of sub-hammers with different masses stacked on the bottom hammer. A circular hole is provided at the center of the bottom hammer and the sub-hammer. The compacting hammer body is inserted into the cylindrical rod through the circular hole and is tightly attached to the bottom plate. A fastener is provided on the top sub-hammer to fix the compacting hammer body to the compacting hammer frame.

[0009] Furthermore, two threaded rods symmetrical about the circular hole are fixed on the bottom hammer, and small holes symmetrical about the circular hole are provided at corresponding positions of the sub-hammers. The threaded rods match the small holes, and several sub-hammers are fixed on the threaded rod of the bottom hammer through the small holes and nuts.

[0010] Furthermore, the bottom hammer and the split hammer are both square steel plates in top and bottom views, and the threaded rod on the bottom hammer and the small holes on the split hammer are both arranged on the upper and lower diagonals of the hammer bodies.

[0011] Furthermore, the bottom plate is a steel plate with a thickness of 2 mm and a bottom surface of 15 cm×15 cm, and the length of the cylindrical rod is 70 cm.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0013] The new compaction hammer device provided by the utility model abandons the restrictions of the compaction cylinder on the reshaped soil samples produced. The base plate and hammer body of appropriate size can be selected according to needs, and it is used for the production of large-scale reshaped soil. The hammer body part is composed of a bottom hammer and a sub-hammer in a detachable fixing manner. The compaction quality can be adjusted according to actual needs. The structure is simple and practical, and the applicable scenarios are wide. It can maximize the restoration of the properties of the soil samples in the study area, which is of great significance to the reliable reconstruction of the covering soil in the indoor physical model research, and ensures the scientificity and reliability of the final research results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the various structures of the compacting hammer in the embodiment of the present invention, wherein (a) is the skeleton part of the compacting hammer; (b) is the bottom hammer and the split hammer part; and (c) is the assembled hammer body part.

[0015] Reference numerals: 1 - cylindrical rod, 2 - bottom plate, 3 - bottom hammer, 4 - split hammer, 5 - round hole, 6 - threaded rod, 7 - small hole. DETAILED DESCRIPTION

[0016] A specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0017] This embodiment provides a compacting hammer for preparing large reshaped soil samples, including a compacting hammer skeleton and a compacting hammer body.

[0018] Hammer skeleton Figure 1 (a) shows:

[0019] The hammer frame is made of stainless steel. The whole consists of a base plate 2 with a thickness of 2mm and a bottom surface of 15cm×15cm and a cylindrical rod 1 with a radius of 1cm and a height of 70cm. The rod is marked with a scale and the maximum drop distance is 70cm. Its function is to facilitate the vertical drop of the hammer.

[0020] The hammer body of the hammer is as follows Figure 1 (b) and (c) show:

[0021] The hammer body is composed of four parts, such as Figure 1 (b) The leftmost hammer body is the bottom hammer 3, which is welded from an iron plate with a circular hole 5 in the center and two cylindrical threaded rods 6 with threads. It has a mass of 2.0 kg. The other three sub-hammer bodies 4 have small holes 7 symmetrical about the circular hole 5 on the diagonal lines of the hammer bodies, which fit with the cylindrical threaded rods 6 with threads on the bottom hammer. They can be freely assembled and disassembled on the bottom hammer 3 and fixed with nuts. The assembly form is as follows Figure 1 (c) The masses of the three sub-hammers from left to right are 0.5 kg, 1.0 kg, and 1.5 kg, respectively. The maximum mass of the hammer can reach 5.0 kg.

[0022] The contents not described in detail in the above specification belong to the prior art known to those skilled in the art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compacting hammer for preparing large reshaped soil samples, characterized by: It includes a hammer frame and a hammer body; The hammer frame comprises a cylindrical rod (1) and a bottom plate (2) fixed to the bottom end of the cylindrical rod (1); a scale is provided on the cylindrical rod (1); The compacting hammer body comprises a bottom hammer (3) and a group of split hammers (4) with different masses stacked on the bottom hammer (3). A circular hole (5) is provided at the center of each of the bottom hammer (3) and the split hammer (4). The compacting hammer body is inserted into the cylindrical rod (1) through the circular hole (5) and is closely attached to the bottom plate (2). A fastener is provided on the uppermost split hammer (4) to fix the compacting hammer body to the compacting hammer frame.

2. A compacting hammer for preparing large reshaped soil samples according to claim 1, characterized in that: Two threaded rods (6) symmetrical with respect to the circular hole (5) are fixed on the bottom hammer (3); small holes (7) symmetrical with respect to the circular hole (5) are provided at corresponding positions of the split hammers (4); the threaded rods (6) match the small holes (7); and a plurality of split hammers (4) are fixed on the threaded rods (6) of the bottom hammer through the small holes (7) and nuts.

3. The compacting hammer for preparing large reshaped soil samples according to claim 2, characterized in that: The bottom hammer (3) and the split hammer (4) are both square steel plates in top and bottom views, and the threaded rod (6) on the bottom hammer (3) and the small hole (7) on the split hammer (4) are both arranged on the diagonal lines of the upper and lower sides of the hammer bodies.

4. The compacting hammer for preparing large reshaped soil samples according to claim 3, characterized in that: The bottom plate (2) is a steel plate with a thickness of 2 mm and a bottom surface of 15 cm×15 cm. The cylindrical rod (1) is 70 cm long.

Images