JPH0362846B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention applies long steel materials for soil mortar column piles, which are constructed underground for mountain and water stop purposes, to an excavated hole into which mortar has been injected. It concerns a method of vertical insertion.

[Conventional technology]

Usually, the I-type steel is inserted into a drilled hole into which mortar has been injected by suspending the I-shaped steel at the center of the hole. In some cases, in order to ensure accuracy in the insertion position, a ruler with a frame for forming an insertion hole for the I-shaped steel is installed above the excavation hole.

[Problem that the invention seeks to solve]

Normally, I-shaped steel materials tend to warp due to their own weight during loading and unloading during transportation. For this reason, even if the lower end of the I-shaped steel is inserted vertically into the opening of the borehole, the flange tip of the I-shaped steel will come into contact with the hole wall halfway due to warping, making it difficult to insert the I-shaped steel. mosquito,
There were problems such as the hole wall collapsing.

This invention was devised to solve the above-mentioned conventional problems, and its purpose is to skillfully insert I-type steel, which becomes difficult to insert as the length becomes longer, into an excavated hole into which mortar has been injected. The goal is to provide a new construction method that allows for

[Means for solving problems]

This invention for the above-mentioned purpose has a tip member attached to the lower end of a long I-shaped steel material, the lower end of the flange is formed into an inclined surface, and the I-shaped steel material is installed vertically in the ground, and a required number of rollers are installed in a casing. It is suspended between the steel parts to immediately correct warpage that occurs in the steel,
Drilling holes for column piles in the ground injected with mortar.
After vertically inserting a ruler of the required length with a rectangular plane and guides for the I-shaped steel material at the four corners and holding the ruler on a workbench, pull out the I-shaped steel material from the casing and insert it into the excavation hole through the ruler. The gist of this is that it is inserted vertically while being held suspended.

〔Example〕

As shown in FIG. 1, first, a tip member 2a having inclined plates 2a on both sides of which the lower end of the flange 1a is inclined inward is attached to the lower end of a long (10 m or more) I-shaped steel member 1.

This I-shaped steel material 1 is suspended between rollers 4 in a casing 3 previously provided in an excavated hole having approximately the same depth as an excavated hole for soil mortar column piles to be described later.

As shown in FIGS. 2 and 3, the rollers 4 are provided in pairs on a frame 3a provided in the casing 3 in multiple stages at required intervals. It is suspended all the way to the bottom, and any warping that occurs during loading and unloading can be straightened out.

Further, as shown in FIG. 4, a ruler 6 of a required length is vertically inserted into the excavated hole 5 for the soil mortar column pile, which has already been excavated and injected with mortar (not shown in the drawing).

As shown in FIG. 8, this ruler 6 has a rectangular planar shape with guides by angle-shaped steel members 6a at the four corners, and each angle-shaped steel member 6a is connected to a steel plate at regular intervals.
b and are connected together.

After this ruler 6 is inserted vertically into the excavation hole 5, the vertical member 7a of the work platform 7 installed on the ground
It is held in place to prevent it from shifting during the insertion process.

Further, the workbench 7 is provided with a jack 8 on a horizontal member 7b perpendicular to the vertical member 7a, so that the workbench 7 is installed horizontally with respect to the ground.

When the insertion of the ruler 6 and the vertical holding work are completed, the I-shaped steel member 1 in the casing 2 is lifted above the ground and transported to the excavation hole 5 as it is.

Then, as shown in FIG. 5, the lower end with the tip member 2 is inserted into the ruler 6, and the
The shaped steel material 1 is inserted into the excavated hole 5.

When the insertion of the I-shaped steel material 1 is completed, the ruler 6 is removed from the vertical member 7a of the workbench 7, and as shown in FIG. 6, it is lifted upward and extracted from the excavation hole 5. Thereafter, the workbench 7 is also lifted and moved together with the ruler 6 to the insertion position for the next I-shaped steel material.

As described above, the roller 4 in the casing 2 eliminates the warping that occurs during loading and unloading, and
Even if the I-shaped steel material 1 is inserted into the borehole 5 through the ruler 6 inserted into the hole, the lower end of the flange does not damage the hole wall, as shown in FIG. 7, even if it is extremely long. It is installed centrally in the borehole 5.

〔Effect of the invention〕

As described above, in this invention, a tip member having an inclined plate with the lower end of the flange as an inclined surface is attached to the lower end of the long I-shaped steel material, so this tip member not only facilitates insertion into a ruler. , the hole wall will not be damaged by the lower end of the flange.

In addition, since the warpage of the I-beam steel was straightened before insertion into the excavation hole, there was no difficulty in inserting it due to warpage, and the insertion work could be carried out quickly before the mortar solidified. It has characteristics.

[Brief explanation of drawings]

The drawings show the method according to the present invention.
The figure is a perspective view of the lower end of the I-type steel material, FIG. 2 is a plan view of the casing, FIG. 3 is a sectional view, and FIGS. Figure 8 is a plan view of the ruler. 1...I type steel material, 1a...flange, 2...tip member, 2a...inclined plate, 3...casing, 4
...Roller, 5...Drilling hole, 6...Ruler, 7...
Workbench, 7a... Vertical member.

Claims (1)

[Claims] 1 Attach a tip member to the lower end of a long I-shaped steel member to form the lower end of the flange into an inclined surface, suspend the I-shaped steel member between the required number of rollers in a casing installed vertically in the ground, While immediately correcting warpage that has occurred in the steel, a ruler of the required length with a rectangular plane and guides for the I-beam steel at the four corners is vertically inserted into the mortar-injected underground column pile drilling hole. insert,
A steel material insertion method for soil mortar column piles, characterized in that after holding the ruler on a workbench, the I-shaped steel material is extracted from the casing, and vertically inserted into the excavation hole through the ruler while being suspended.