Pounder for dynamic compaction of deep layer in DDC hole

Abstract

The utility model relates to the technical field of DDC in-hole deep dynamic compaction, in particular to a rammer for DDC in-hole deep dynamic compaction. Comprising a hammer head, a hammer body connected with the hammer head and a hammer tail connected with the hammer body. The hammer head is a cone, the hammer body is a cylinder, the bottom face of the cone of the hammer head is connected with the hammer body, a hemispherical steel head is arranged at the tip end of the cone of the hammer head, and an extrusion groove extending in the direction of the center axis of the hammer body is formed in the peripheral side of the hammer body. According to the utility model, the inherent mode of rotary drilling of the conventional rotary drilling machine is changed, and the impact drilling method is adopted, so that the earth-rock mixture is formed on the hole wall. The anti-sliding force of the hole wall is effectively enhanced, it is guaranteed that follow-up filler tamping pier forming is continuously carried out, the streamline hammer head reduces the resistance during downward impact, the hole can be subjected to deeper downward impact forming, the DDC can treat deeper soft miscellaneous fill, and the hole forming effect is better.

Description

Technical Field

[0001] This utility model relates to the field of deep dynamic compaction technology in DDC boreholes, specifically a rammer for deep dynamic compaction in DDC boreholes. Background Technology

[0002] Down Hole Deep Compaction (DDC), also known as deep dynamic compaction in boreholes, is an effective foundation treatment method. Its main characteristics are: first, a hole with a diameter of 120-140 cm is drilled in the site using a long auger drill bit; then, plain soil, stone, construction waste, or other materials are filled into the hole, and compacted with a 200-400 kN hammer. This process is repeated from bottom to top until a pile with a diameter of 200-240 cm is formed, and the soil between the piles is compacted, thus forming a DDC pile composite foundation. During the compaction process, the fill material in the borehole is forced to be squeezed out laterally, causing the soil within a certain range around the pile to be compressed, disturbed, and reshaped. Simultaneously, the huge impact energy generated by the compaction produces wave and dynamic stress that repeatedly acts, forcing the soil skeleton to generate plastic deformation energy, thereby increasing the soil's density and shear strength, improving its deformation characteristics, and significantly increasing the bearing capacity of the resulting composite foundation. However, for soft, miscellaneous fill soil in the site, this method is prone to borehole collapse during the drilling process, which can affect subsequent filling construction. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, this utility model provides a tamping hammer for deep dynamic compaction in DDC holes, which enhances the rigidity of the hole wall, enhances the soil compaction effect between piers, and solves the problems involved in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a tamping hammer for deep compaction in DDC holes, comprising a hammer head, a hammer body connected to the hammer head, and a hammer tail connected to the hammer body;

[0005] The hammer head is a cone, the hammer body is a cylinder, the bottom surface of the cone of the hammer head is connected to the hammer body, the tip of the cone of the hammer head is provided with a hemispherical steel head, and the outer periphery of the hammer body is provided with an extrusion groove extending along the central axis of the hammer body.

[0006] Furthermore, the extrusion grooves are provided in several portions and are evenly distributed on the outer periphery of the hammer body.

[0007] Furthermore, the cross-section of the extrusion groove is rectangular.

[0008] Furthermore, the cross-section of the extrusion groove is trapezoidal.

[0009] Furthermore, the hammer tail is cylindrical.

[0010] Furthermore, the hammer body and the hammer tail are connected by high-strength bolts.

[0011] Furthermore, the hammer tail is provided with a hammer tail hanging point.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention changes the traditional rotary drilling method by employing an impact drilling approach, which forms a soil-rock mixture on the borehole wall. This effectively enhances the borehole wall's anti-slip properties, ensuring the continuous compaction of subsequent fill material. The streamlined hammer reduces downward resistance, allowing for deeper impact drilling and enabling the DDC (Drilling and Concrete Drilling Machine) to handle deeper, soft, and miscellaneous fill soils, resulting in better drilling performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the usage state structure of an embodiment of the present utility model;

[0016] Figure 3 This is a side sectional view of the extrusion groove in Embodiment 1 of this utility model;

[0017] Figure 4 This is a side sectional view of the extrusion groove in Embodiment 2 of this utility model;

[0018] In the picture:

[0019] Hammer head 1, hemispherical steel head 11, hammer body 2, extrusion groove 21, hammer tail 3, high-strength bolt 4, hammer tail hanging point 5. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] Depend on Figure 1-3 As shown, a tamping hammer for deep dynamic compaction in DDC holes includes a hammer head 1, a hammer body 2 connected to the hammer head 1, and a hammer tail 3 connected to the hammer body 2.

[0023] The hammer head 1 is a cone, and the hammer body 2 is a cylinder. The bottom surface of the cone-shaped hammer head 1 is connected to the hammer body 2.

[0024] The hammer head 1 has a hemispherical steel head 11 at its conical tip, which increases the downward impact force. The outer periphery of the hammer body 2 has several extrusion grooves 21 extending along its central axis. These grooves are evenly distributed on the outer periphery of the hammer body 2. The cross-section of each extrusion groove 21 is rectangular. This increases lateral force, significantly enhancing the soil compaction effect between piers, thereby increasing the rigidity of the borehole wall and reducing the risk of borehole collapse.

[0025] The hammer tail 3 is cylindrical. The hammer body 2 and the hammer tail 3 are connected by high-strength bolts 4. The hammer tail 3 is provided with a hammer tail hanging point 5 for connecting to a tamping machine.

[0026] Usage process:

[0027] 1. Use a rotary drilling machine to drill a hole to the position where the diameter will be reduced, and the hole diameter shall not be less than 1400mm.

[0028] 2. When encountering loose soil and severe hole shrinkage during the hole-forming process, a certain amount of weathered material can be backfilled, and then a rammer can be inserted to impact and reinforce the hole. This will force the weathered material into the hole wall, thus reinforcing the hole wall in the loose soil area. Then, the hole-forming operation can be carried out again.

[0029] 3. Fill the hole with weathered material and use a ram to compact it while filling.

[0030] 4. Use a water-drop hammer to add material to form a mound until the material is 1.5m away from the ground at the borehole opening, then stop the operation.

[0031] 5. After leveling the site, compact it with a full 1000kN·m.

[0032] This application addresses the shortcomings of traditional DDC (Dynamic Dynamic Compaction) construction, where vertical drilling is ineffective, prone to collapse, requires significant manpower and resources, and suffers from poor stability. The use of a conical hammer significantly enhances the impact force of the hammer, increases the depth of hole penetration, simplifies subsequent processes, and the extrusion groove increases the compressive force on the hole wall, thereby increasing its rigidity. This improves production efficiency, enhances hole stability, saves manpower and resources, and offers versatility and a wide range of applications.

[0033] Example 2:

[0034] The similarities between this embodiment and Embodiment 1 will not be repeated here. The differences are as follows:

[0035] like Figure 4 As shown, the cross-section of the extrusion groove 21 is trapezoidal. The trapezoidal shape can reduce the probability of weathered material getting stuck in the extrusion groove 21 and improve the extrusion effect.

[0036] 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 rammer for deep dynamic compaction in DDC boreholes, characterized in that: Includes a hammer head, a hammer body connected to the hammer head, and a hammer tail connected to the hammer body; The hammer head is a cone, the hammer body is a cylinder, the bottom surface of the cone of the hammer head is connected to the hammer body, the tip of the cone of the hammer head is provided with a hemispherical steel head, and the outer periphery of the hammer body is provided with an extrusion groove extending along the central axis of the hammer body.

2. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The extrusion grooves are provided in several parts and are evenly distributed on the outer periphery of the hammer body.

3. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The extrusion groove has a rectangular cross-section.

4. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The cross-section of the extrusion groove is trapezoidal.

5. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The hammer tail is cylindrical.

6. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The hammer body and the hammer tail are connected by high-strength bolts.

7. The tamping hammer for deep dynamic compaction in DDC holes according to claim 1, characterized in that: The hammer tail is provided with a hammer tail hanging point.

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