JPS60129320A - Dynamic consolidating method for ground - Google Patents

Abstract

PURPOSE:To prevent loosening of a ground and to effectively utilize drop energy of a weight, by a method wherein, when a ground is consolidated in a dynamic manner through drop of the weight, the weight for restraining a ground is previously placed around the drop point of the weight. CONSTITUTION:A weight 17 for restraining a ground having a hole, through which a weight 11 passes, is previously placed on the surface of a portion, where there is a possibility of a ground 15 being loosened, around a drop point 16 of a weight 11. Thereafter, the weight 11, lifted up by means of a crane 12, is released and dropped under gravity. This exerted impact on a ground surface 14 to transfer a compression force and an impact force generated by the weight of the weight 11 to the ground 15 to consolidate the ground 15.

Description

[Detailed description of the invention] The present invention relates to an improvement in a ground dynamic consolidation method.

Figure 1 shows the state of compaction of ground by the conventional dynamic consolidation method, in which a rectangular or disc-shaped weight (1) is raised to the required height by a hanging rope (3) of a mobile crane (2). After it is suspended, the lifting force from the hanging rope (3) is suddenly released and the weight (1) is lifted.
) is allowed to fall freely, the ground surface (4) is given a force K, and the compressive force and impact force due to the weight of the weight (1) are transmitted to the ground (5), causing the same ground (5) to fall. Compaction, as described above
4 operations are repeated to consolidate the ground.゛"The number of falls, fall height, and weight of the weight (1) depend on the type of ground,
Appropriately determined by strength.

In this way, when the consolidation of the ground by the weight at one location is completed, the mobile crane (2) is rotated or moved to change the dropping position, and the same operation as described above is repeated.

However, in the conventional construction method, although the part (6) directly below the weight (1) is effectively compacted, the confining pressure in the surrounding part (7) is small, so it is known that the ground may partially loosen. It is being

The present invention was proposed in order to solve these problems, and in a ground dynamic consolidation method in which a heavy weight is dropped and applied to the ground surface, the ground is preliminarily placed around the point at which the weight falls on the ground. This method relates to a method of ground cleansing, which is characterized in that the weight is dropped at the same drop point where a restraining weight is installed.

In the present invention, as described above, a ground restraining weight is installed in advance around the point at which the weight falls on the ground, and then the ground is consolidated by dropping the weight at the same point. So.

The ground around the point where the weight falls, which is likely to loosen, will not loosen due to the confining pressure of the ground restraining weight (and the energy of impacting the ground by the weight will be effectively used to consolidate the ground). be.

The illustrated embodiments of the present invention will be described below.

aυ is one weight, and after it is lifted to the required height by the mobile crane (14), the lifting blade by the hanging rope (13) is suddenly released, allowing the weight αυ to fall freely, and the weight αυ is lowered to the ground surface α.
(a) and transmits the compressive force and impact force due to the weight of the weighted dwelling υ to the ground α■, thereby consolidating the same ground (151).

Then, the weight Q1 is placed on the ground surface in a part where the ground is likely to loosen around the drop point (16) of the weight Q1).
) A ground restraining weight (In) having a hole through which the ground restraining weight (In) is installed in advance, and the one weight aυ applies an impact force to the ground surface.

As mentioned above, the area around the point where the weight falls, which could have loosened, does not loosen due to the restraining pressure of the ground restraining weight ←υ, and the impact energy from the weight αυ is effectively applied to the ground (15). used for consolidation.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and various design modifications may be made without departing from the spirit of the present invention. It is something.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional side view showing the implementation status of the conventional soil dynamic consolidation method, and Fig. 2 is a vertical cross-sectional view showing the implementation status of an example of the ground σ] dynamic consolidation method according to the present invention. Figure 6 is a cross-sectional plan view of the ground restraining weight. αυ... Weight, (151-... Ground, (tη... Weight for ground restraint) Sub-agent Patent attorney Shige Okamoto 3 other people

Claims (1)

[Claims] In a ground dynamic consolidation method in which a heavy weight is applied to the ground surface by dropping, a ground restraining weight is installed in advance around the drop point of the weight in the ground, and then the weight is dropped to the same drop point. A dynamic consolidation method for the ground characterized by