KR20230044732A - Dynamic compaction tampers with low vibration and high efficiency - Google Patents

Abstract

The present disclosure relates to a low-vibration, high-efficiency dynamic compaction tamper. The low-vibration, high-efficiency dynamic compaction tamper of the present disclosure comprises: a plurality of bracket pairs having a connecting ring for connection to a crane wire; and a body part on which the plurality of bracket pairs are installed in an embedded manner.

Description

Low vibration and high efficiency dynamic compaction tamper {DYNAMIC COMPACTION TAMPERS WITH LOW VIBRATION AND HIGH EFFICIENCY}

The present invention relates to a low-vibration and high-efficiency dynamic compaction tamper, and more particularly, to a tamper capable of achieving low vibration and high efficiency applied to a dynamic compaction method.

The dynamic compaction method is a method of obtaining a compaction effect by repeatedly dropping a heavy object on the soft ground to be improved. It is a method of making the ground hard by compacting the ground to a considerable depth by free-falling a heavy weight from a high place using special equipment such as a crane and applying impact energy to the ground.

As related prior literature, Korean Patent Registration No. 10-1077475 (invention title: compaction device using a compaction plate) discloses that an improved compaction plate is brought into close contact with the ground so that impact energy can be accurately transferred to the ground, and a hammer is applied to the compaction plate. Shows the composition of the attack. Disclosed is a hammer in which a vertical groove is formed in the center of the improved compaction plate, a rod inserted and fixed into the vertical groove, and a vertical hole inserted movably up and down through the outer periphery of the rod are formed.

However, it is evaluated that the existing technologies including the prior patents are difficult to expect a proper compaction effect in applying the dynamic compaction method to the field, and only noise and vibration are severe. Even in the case of the prior patent, it is a structure in which noise and vibration are inevitably more severe by existing on an additional impact surface between the compaction plate and the hammer as well as the impact surface between the ground and the compaction plate.

This is because there is a lack of research on reducing noise and vibration while maximizing the compaction effect.

In addition, due to the essential characteristics of ground impact caused by free fall, the tamper must have a high weight, and the connection part with the crane wire must be designed to withstand a large load. work is frequent Even slight damage makes it difficult to maintain level, reducing work efficiency, and poses the risk of a safety accident from being separated from the crane wire.

The inventor of the present invention has completed the present invention after long research and trial and error in order to solve these problems.

Embodiments of the present invention provide a dynamic compaction tamper that can achieve low vibration and high efficiency in the dynamic compaction method and has excellent durability.

Meanwhile, other unspecified objects of the present invention will be additionally considered within the scope that can be easily inferred from the following detailed description and effects thereof.

The dynamic compaction tamper applied to the dynamic compaction method according to an embodiment of the present invention includes a plurality of bracket pairs having a connecting ring for connection with a crane wire; and a body portion on which the plurality of bracket pairs are installed in a buried manner.

When the body is made of a casting, the plurality of bracket pairs may be inserted and cast.

Any one of the plurality of bracket pairs includes a first bracket and a second bracket, and the first bracket and the second bracket are disposed to face each other and may be installed such that a portion of the bracket is buried in the upper part of the body part. .

The bracket may include a base portion including one area exposed to the upper portion of the body and another area buried into the body, and the connection ring may be provided in the one area.

The bracket further includes a pair of rib parts installed from both sides of the base part across the one area and the other area, and the expansion hole formed in the rib part is the other of the one area and the other area. area can be adjacent.

The bracket may further include a leg portion installed from an end of the base portion in the other area.

The base portion may include an expansion hole formed in the other area.

The present technology can provide a dynamic compaction tamper with low vibration and high efficiency.

In addition, the present technology can provide a dynamic compaction tamper with excellent durability.

1 is a view schematically showing a state in which a dynamic compaction method is performed using a low-vibration and high-efficiency dynamic compaction tamper according to an embodiment of the present invention.
2 is a diagram showing a perspective view of a low-vibration high-efficiency dynamic compaction tamper according to an embodiment of the present invention.
3a and 3b are views respectively showing a front view and a plan view of a low vibration and high efficiency dynamic compaction tamper according to an embodiment of the present invention.
4 is a view showing a perspective view of a bracket pair according to an embodiment of the present invention.
5a and 5b are views respectively showing a plan view and a side view of a bracket pair according to an embodiment of the present invention.
6 shows a plan diagram of applying a dynamic compaction method to a work area using a low-vibration high-efficiency dynamic compaction tamper according to an embodiment of the present invention.
7A and 7B are diagrams showing a process of forming a crater using a low-vibration and high-efficiency compaction tamper according to an embodiment of the present invention in contrast to a conventional method. shows a case in which a tamper according to an embodiment of the present invention is used.
It is revealed that the accompanying drawings are illustrated as references for understanding the technical idea of the present invention, and thereby the scope of the present invention is not limited thereto.

In the following, the most preferred embodiment of the present invention is described. In the drawings, the thickness and interval are expressed for convenience of explanation, and may be exaggerated compared to the actual physical thickness. In describing the present invention, well-known configurations irrelevant to the gist of the present invention may be omitted. In adding reference numerals to the components of each drawing, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings.

1 is a view schematically showing a state in which a dynamic compaction method is performed using a low-vibration and high-efficiency dynamic compaction tamper according to an embodiment of the present invention.

As shown in FIG. 1, a low-vibration high-efficiency dynamic compaction tamper 100 (hereinafter referred to as a 'dynamic compaction tamper' for convenience of description) is installed to hang from the wire 11 of the crane 10, and By free-falling, the ground to be improved can be compacted.

A crater (referred to as C) is created in the area hit by the compaction tamper. It may be hit once, but typically the compaction process can be performed by repeatedly hitting the same part several times. The same compaction procedure can then be performed on adjacent areas.

On the other hand, the ground has an elastic property derived from the soil, and in the above-described dynamic compaction method, it is important to strike with an energy intensity that allows the ground to deviate from the elastic range of the soil.

That is, in the compaction process, energy intensity is applied so that the soil leaves the elastic section and reaches the plastic section, thereby obtaining a desired compaction effect. If the compaction process is performed only with values within the elastic deformation range, the soil eventually returns to its original shape by its own elasticity, and therefore cannot be improved into a ground that can withstand the load to be designed. With only the energy intensity within the elastic section, no matter how many blows are made, the same result as a meaningless blow to the spring is obtained.

Energy intensity is a value determined by the shape and density of the tamper and the free fall height, and may have a value greater than the required energy intensity by simply increasing the weight of the compaction tamper or increasing the free fall height. However, these things cause great vibration and noise to surrounding buildings and people. It can only increase the compaction effect, but the problem of vibration or noise increases.

In addition, even in one work area, the closer the compaction position is to the surrounding building, the greater the propagation of vibration and noise, so the design that can reduce vibration and noise while hitting with the energy intensity outside the elastic section of the soil described above is more It is required.

Hereinafter, a low-vibration and high-efficiency dynamic compaction tamper according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2 to 7 . As will be described below, the dynamic compaction tamper according to an embodiment of the present invention is a single high-density material and can apply consistent energy intensity to the hitting position that is not affected by the cross-sectional area. In addition, the design structure of the optimal dynamic compaction tamper suitable for high-density materials is presented.

2 is a diagram showing a perspective view of a low-vibration high-efficiency dynamic compaction tamper according to an embodiment of the present invention.

3 is a view showing a front view and a plan view of a low vibration and high efficiency dynamic compaction tamper according to an embodiment of the present invention. 3A shows a front view and FIG. 3B shows a plan view, respectively.

4 is a view showing a perspective view of a bracket pair according to an embodiment of the present invention.

And, Figure 5 is a view showing a plan view and a side view of a bracket pair according to an embodiment of the present invention. Figure 5a shows a plan view and Figure 5b shows a side view, respectively.

Referring to FIGS. 2 to 5 , the compaction tamper 100 includes a plurality of bracket pairs 110A, 110B, 110C, and 110D and a body portion 120 .

The plurality of bracket pairs 110A, 110B, 110C, and 110D are symmetrically disposed on the upper portion of the body portion 120 . In the present invention, for convenience of description, the bracket pair 110A and the bracket pair 110B are disposed symmetrically with respect to the center of the body, and the bracket pair 110C and the bracket pair 110D are symmetrically arranged with each other. It will be described focusing on the arranged embodiment, but the present invention is not limited to this arrangement. In addition, since all of the plurality of bracket pairs 110A, 110B, 110C, and 110D may have the same structure as shown in the drawing, one bracket pair 110A will be described for convenience of description.

The bracket pair 110A includes a first bracket 110a and a second bracket 110b. The first bracket and the second bracket are arranged to face each other and installed in the upper part of the body part 120 in a buried type. As shown in the drawings, the first bracket and the second bracket may have the same structure, and the same reference numerals applied to the first bracket 110a may be applied to the second bracket 110b. The same description as that for the first bracket may be applied to the second bracket. Hereinafter, the first bracket or the second bracket may simply be referred to as a 'bracket'.

The bracket pair (110a, 110b) has a connection ring (H) for connection with the crane wire. The connecting ring may be provided in various shapes for connection with the crane wire 11, but in the present invention, an embodiment of a hole structure will be mainly described.

Bracket pairs 110a and 110b according to an embodiment of the present invention are installed in a buried type exposed for a certain period from the upper surface 122 of the body part.

The bracket pairs 110a and 110b may be divided into an exposure section S1 and a buried section S2, so that the exposure section S1 is exposed from the upper surface 122 of the body portion 120, and the buried section ( S2) is installed to be buried in the upper part of the body part 120. That is, the pair of brackets are disposed to face each other and are installed such that a part of them is buried in the upper part of the body part.

The body part 120 according to the embodiment of the present invention is made of a single high-density material. Here, a single material refers to a case in which the density can be predicted even if the size is changed by being composed of one material. For example, the body portion 120 may be made of a steel material.

The body part 120 may be manufactured by a casting method as it is made of a single high-density material.

According to an embodiment of the present invention, the plurality of bracket pairs 110A, 110B, 110C, and 110D may be inserted and cast during the manufacturing process of the body part 120 . That is, when the body is made of a casting, a plurality of bracket pairs may be inserted and cast. As a result, the bracket corresponding to the connection portion with the crane wire can be more firmly coupled to the body portion.

In general, in the dynamic compaction process, since the rise and fall are repeated to the free fall position, a very high load is concentrated on the crane connection part (wire-tamper connection part, for example, such as the link (H)). At this time, the cast-type body part and the embedded bracket according to the embodiment of the present invention strengthen the connection between the body part and the bracket to solve the problem of the bracket being separated from the body part even when the load is concentrated on the connection part. Improves the durability of the dynamic compaction tamper.

Hereinafter, the structure of the bracket will be described in more detail. Although the first bracket is mainly examined, the same description may be applied to the second bracket.

Continuing to refer to FIGS. 4 and 5 , the first bracket 110a includes a base part 112 , a pair of rib parts 114 and a leg part 116 .

The base portion 112 may have a plate shape. It may include one region R1 exposed outside the upper surface of the body and another region R2 buried inside the body. The aforementioned connection ring H is provided in one region R1.

A pair of rib portions 114 are upright from both sides of the base portion 112 . The inner part of the body part increases the contact area with the body part to make the coupling between the bracket and the body part more robust, and the outer part of the body part serves as a support to prevent damage to the base part of the exposed section by external force.

As shown in the drawing, the pair of rib parts may have an inclined part 1142 and a flat part 1144. The inclined portion provides an offset space for a connecting member (such as a connecting pin, not shown) to be inserted into the connecting ring H. At the same time, it serves as a support on the outside of the body part described above. The flat portion serves to strengthen the above-described coupling inside the body portion.

The leg portion 116 is upright from the end of the base portion 112 . By increasing the contact area with the body inside the body, the coupling between the bracket and the body is more firmly established. The above-described pair of ribs increase the contact area with the body in the vertical direction (direction indicated by h on the drawing), and the leg portion increases the contact area with the body in the horizontal direction (direction indicated by D on the drawing). stretch

It is preferable that the standing height of the leg part is designed to be the same as the standing height of the rib part so as not to interfere with adjacent brackets inside the body part.

Expansion holes 1141 , 1121 , 1123 , and 1125 may be provided to further increase a contact area with the body part within the body part. An expansion hole 1141 having a structure penetrating the rib portion may be provided. Expansion holes 1121, 1123, and 1125 having a structure penetrating the base portion may be provided. The number and size of the expansion holes are not limited to those shown in the drawing, but considering the trade-off relationship between the increase in contact area and the decrease in hardness due to perforation, one expansion hole each in the rib part and three expansion holes in the other area of the base part It is desirable that balls are provided. In addition, it is preferable that the expansion hole 1123 disposed approximately in the center of the other area of the base portion is larger than the expansion holes 1121 and 1125 disposed on both sides. In addition, in order to promote the convenience of manufacturing the bracket together, the size of the expansion hole 1123 may be designed to be the same as the size of the connecting ring (H).

The first bracket having a structure including the above-described base portion, a pair of rib portions, and a leg portion may be integrally manufactured. For example, it can be made from a single material by way of casting. That is, each of the brackets may be manufactured by casting, and then, when the body is cast, the bracket may be inserted and cast.

6 shows a plan diagram of applying a dynamic compaction method to a work area using a low-vibration high-efficiency dynamic compaction tamper according to an embodiment of the present invention.

7 shows a process of forming a crater using a low-vibration high-efficiency dynamic compaction tamper according to an embodiment of the present invention in contrast to the conventional method. FIG. 7A illustrates a case in which a conventional tamper is used, and FIG. 7B illustrates a case in which a tamper according to an embodiment of the present invention is used.

First, referring to FIG. 6 , a work area (Aw) requiring improvement is determined, and a neighboring building (B) exists adjacent to the work area. In the work area Aw, positions of craters to be compacted are indicated by C1 to Cn. In the drawing, n is 25, which is the total number of craters.

Dynamic compaction is performed over the work area with a given energy intensity. In general, the energy intensity is represented by the height of the tamper (h) * the density of the tamper (ρ) * the free fall height (s) * the cross-sectional area of the tamper (A) / the cross-sectional area of the tamper (A). The predetermined energy intensity may be a value that allows the soil to deviate from an elastic range of the corresponding work area. That is, it may be a value that allows the soil of the corresponding work area to enter the firing section. Such energy intensity may be determined from ground information of a work area or target design load information.

At this time, as the location is closer to the surrounding building (B) (such as C1, C2, or C5), it is necessary to change the work to reduce propagated vibration and noise. In the case of the existing tamper 20, as shown in FIG. ) and the bottom 22, it is common to work by removing one of them, the bottom 22. As a result, the energy intensity is reduced (so the vibration and noise transmitted to the surrounding buildings are reduced), but due to the lower value, the energy intensity for entering the soil into the firing section can no longer be satisfied. Since the height (h) of the tamper is halved, the energy intensity is also halved. As described above, such a blow is a blow within the elastic section of the soil, and it is difficult to expect a sufficient compaction effect even if repeated blows are made.

In contrast, the tamper 100 according to the embodiment of the present invention can apply a tamper 100 having the same height and only a reduced cross-sectional area compared to the tamper 100 'used in the previous work, thereby maintaining the energy intensity as it is It is possible. This is because the energy intensity is independent of the cross-sectional area of the tamper. That is, even after a job change, the target energy intensity can be maintained as it is, and thus a sufficient compaction effect can be derived. Although it is accompanied by a slight reduction in the impact area due to the reduction in the cross-sectional area of the tamper, it reduces the dominance of the Rayleigh wave (R wave) among the vibration waves (P-wave, S-wave, R-wave) to a certain level, thereby reducing the damage to the surrounding buildings (B). It has a positive effect on reducing vibration and noise transmitted to the

Since the tamper according to the embodiment of the present invention is made of a casting, it is possible to manufacture a tamper with a consistent density regardless of the cross-sectional area. That is, since the density of the tamper 100' used in the previous work and the density of the tamper 100 to be used after the change are the same, it is possible to easily change the work according to the compaction position by providing several tampers with different cross-sectional areas at the work site. That is, compaction may be performed using a tamper having a large cross-sectional area at a location far from the surrounding building, and compacting using a tamper having a small cross-sectional area at a location very close to the surrounding building. This can effectively reduce the vibration and noise of surrounding buildings and at the same time derive sufficient compaction performance.

As described above, the low-vibration and high-efficiency dynamic compaction tamper according to an embodiment of the present invention increases dynamic compaction efficiency by applying a consistent energy intensity that allows the soil of the ground to deviate from the elastic section. In addition, by making it possible to predict the energy intensity of tampers of various shapes in which only the cross-sectional area is changed without changing the height, it is possible to easily change and apply tampers of different shapes according to the compaction position during the compaction process in the work area. It can minimize the vibration and noise propagated to the At this time, the energy intensity is maintained as it is. To this end, the low-vibration and high-efficiency dynamic compaction tamper according to an embodiment of the present invention has a body part made of a casting, and when it is made of a casting, since a plurality of bracket pairs are inserted and cast thereon, it has a robust coupling structure with improved durability.

Although the technical idea of the present invention has been specifically written according to the above preferred embodiments, it should be noted that the above embodiments are for explanation and not for limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the spirit of the present invention.

10: Crane
11: crane wire
100: low vibration high efficiency dynamic compaction tamper
110A, 110B, 110C, 110D: plural pairs of brackets
110a: first bracket
110b: second bracket
112: base part
1121, 1123, 1125: Expansion hole
114: a pair of rib parts
1141: expansion hole
1142: slope
1144: flat part
116: leg part
120: body part
122: upper surface
S1: exposure period
S2: landfill section
R1: one area of the base
R2: Other areas of the base

Claims (7)

In the dynamic compaction tamper applied to the dynamic compaction method,
A plurality of bracket pairs having a linkage for connection with the crane wire; and
A low-vibration high-efficiency compaction tamper including a body portion in which the plurality of bracket pairs are installed in a buried manner.
According to claim 1,
A low-vibration high-efficiency compaction tamper in which the plurality of bracket pairs are inserted and cast when the body is made of a casting.
According to claim 1,
Any one of the plurality of bracket pairs includes a first bracket and a second bracket,
The first bracket and the second bracket are disposed to face each other and are installed so that a part is buried in the upper part of the body, and the low vibration and high efficiency dynamic compaction tamper.
According to claim 1,
The bracket is
A base portion including one area exposed to the upper portion of the body and another area buried into the body portion; includes,
A low-vibration high-efficiency compaction tamper in which the connection ring is provided in the one area.
According to claim 4,
The bracket is
A pair of ribs standing from both sides of the base portion over the one area and the other area; further comprising,
The expansion hole formed in the rib part is adjacent to the other area of the one area and the other area, low vibration and high efficiency compaction tamper.
According to claim 4,
The bracket is
A low-vibration high-efficiency compaction tamper further comprising a; leg portion upright from the end of the base portion in the other area.
According to claim 4,
The base portion includes an expansion hole formed in the other area, low vibration high efficiency dynamic compaction tamper.

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