JPS63521A - Insertion work of steel material of soil-mortar column-line pile - Google Patents

Abstract

PURPOSE:To prevent damage to the pit wall by a method in which a long I-shaped steel material having a tip with sloped face on its lower end is hung down between rollers under ground for correcting its warping and vertically inserted into the excavated pit when being pulled out of a casing. CONSTITUTION:A tip part 2 with an inclined plate 2a is attached to the lower end of along I-shaped steel material 1 and hung down between rollers 4 in a casing 3 provided in an excavated pit to the bottom of the pit for correcting the warping of the steel material 1. A rectangular flat scale 6 of a given length, having angular steels 6a on its four corners, is vertically penetrated into an excavated pit 5 for soil mortar column-line pile. The steel material 1 in the casing 3 is lifted up and moved to the pit 5, and the tip part 2 on the lower end is inserted into the scale 6, and the material 1is inserted into the pit 5. These processes are repeated to move it to the inserting position of the steel material. The steel material can thus be easily penetrated until the soil mortar hardens.

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. ! r! This relates to a direct insertion method.

(Prior art) Insertion of I-beam steel into an excavated hole with mortar injected is usually done by
This is done by suspending Type 1 steel material in the center of the drilling hole. In some cases, in order to ensure precision in the insertion position, a ruler with a 1Φ hole made of I-beam steel is installed on top of the excavation hole using a framework.

[Problem that the invention seeks to solve]

Normally, I-shaped steel materials tend to warp due to self-stretching during loading and unloading during transportation. For this reason, when inserting an I-type steel member vertically into the opening of a drilling hole, the
The tip of the flange of the I-shaped steel came into contact with the formal attire, making it difficult to insert the I-shaped steel, as well as causing 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-shaped steel materials, which become difficult to insert as they become 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]

The present invention according to the above-mentioned object has a tip member attached to the lower end of a long L-shaped steel member, and the lower end of the flange is formed into an inclined surface.
The L-shaped steel material is suspended between the required number of rollers in a casing installed vertically underground, and any warping that occurs in the steel material is immediately corrected. A ruler of the required length with a rectangular plane and guides for the L-shaped steel material at the four corners is vertically inserted into the excavation hole, and after holding the ruler on a workbench, the L-shaped steel material is extracted from the casing and the ruler is inserted into the hole. The gist of this method is to insert it vertically into the excavation hole while hanging it through the hole.

〔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 type 1 steel material 1 (10 m or more).

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

As shown in FIGS. 2 and 3, the rows 54 are provided in multiple stages at required intervals in pairs on the frame 3a provided in the casing 3, and between the rollers 4, an L-shaped steel member 1
is suspended to the bottom of the casing, and any warping that occurs during loading and unloading is straightened out.

In addition, there is a fourth hole in the excavated hole 5 for soil mortar column piles that has already been drilled and injected with mortar (not shown in the drawing).
As shown in the figure, a ruler 6 of the required length is inserted directly into I.

As shown in FIG. 8, this ruler 6 has angle-shaped steel members 6a at the four corners.
The angle-shaped steel members 6a are surrounded by steel plates 6b at regular intervals and are integrally connected.

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

Further, the workbench 7 is provided with a jib 8 on a horizontal member 7b orthogonal 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 L-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 having the tip member 2 is inserted into a ruler 6, and the L-shaped steel material 1 is inserted into the excavated hole 5 through the ruler 6.

When the insertion of the L-shaped steel material 1 is completed, the ruler 6 is removed from the vertical part tJ7a of the workbench 7, and as shown in FIG. 6, it is lifted upward and not removed 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 type 1 steel material.

As described above, the L-shaped steel material 1 that is inserted into the excavated hole 5 through the ruler 6 inserted into the excavated hole 5 in advance is made to have a significantly long length. Even if it is a flange, it can be installed centrally in the borehole 5, as shown in FIG. 7, without damaging the borehole wall by the lower end of the flange.

〔Effect of the invention〕

As described above, the present invention has an inclined plate at the lower end of the elongated L-shaped steel member, with the lower end of the flange serving as an inclined surface. Since the tip member is attached, the tip member not only facilitates insertion into the ruler, but also prevents the hole wall from being damaged by the lower end of the flange.

In addition, since we straightened the warpage of the L-shaped steel before inserting it into the excavation hole, there was no difficulty in inserting it due to warpage, and the insertion work could be carried out quickly and efficiently before the mortar solidified. Right features.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show the method according to the present invention, in which FIG. 1 is a perspective view of the lower end of the I-type moon, FIG. 2 is a plan view of the casing,
3 is a sectional view, FIGS. 4 to 7 are sectional views sequentially showing the process of inserting the ruler into an excavated hole, and FIG. 8 is a plan view of the ruler. 1...I type steel material, 1a...flange, 2...tip member, 2a...
・Slanted board. 3... Casing, 4... Roller, 5... Drilling hole, 6... Ruler, 7... Workbench, 7a... ...Vertical member.

Claims (1)

[Claims] A tip member is 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 suspended between the required number of rollers in a casing installed vertically underground. While immediately correcting the warpage that occurred, a ruler of the required length with a rectangular plane and I-shaped steel guides at the four corners was inserted vertically into the mortar-injected underground column pile excavation hole. After holding the ruler on a workbench, the I-shaped steel material is extracted from the casing, and inserted into the excavation hole vertically while being suspended through the ruler.