JPS58173288A - Auger construction method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auger method that allows continuous excavation when there are hard strata or bedrock in the IIK or It excavation, or where cobbles and boulders are present.

Traditionally, augers have a
There are known ones that have spiral blades attached to the auger shaft, and ones that have an auger head attached to the tip of the auger shaft.
Both methods use intermittent excavation, in which after rotary excavation, the soil packed between the spiral blades is discharged by pulling up the auger, and then pushed into the ground again. Because I didn't get any results, I was inefficient at work 11. Moreover, since the excavated earth and sand were brought to the surface, the work site was kept clean and a soil disposal area was required. In addition, if the excavated ground contains hard strata, cobblestones, or boulders, the auger head cannot cut it, so the excavation had to be stopped when it hit the cobblestones. If further excavation work is to be carried out, it is necessary to remove the auger from the hole, insert a tool with a cutter head at the tip of the shaft, re-set it, and cut the hole, resulting in a long time between changing the auger and cutter head. The drawback is that it takes an extremely large amount of time to assemble and drill holes.

The present invention was devised to solve the above-mentioned conventional problems all at once, and is an auger construction method using a single auger. In addition to continuous drilling, the excavated earth and sand and gravel made by cutting (hereinafter referred to as excavated earth and sand) are sufficiently stirred and kneaded with bentonite liquid, etc., and this mixed material is applied to the hole wall and pushed in. Through consolidation, the hole wall is reliably consolidated to near the consolidation limit of each layer such as loam layer, sand layer, gravel layer, etc., thus making it possible to significantly improve construction efficiency and construction quality compared to the conventional method, and to reduce waste disposal. The aim is to provide an auger construction method that can eliminate the problem entirely.

The auger used in the construction method of the present invention will be explained below with reference to FIG. 11iK.

The auger shaft 1 is a stepped shaft whose base end s8 has a diameter close to the hole diameter of a cutter head 10, which will be described later. - a consolidation tool 3, and stirring blades 4, 4' projecting radially from the shaft surface at the tip and base ends of the shaft of the vertical consolidation blade 3.

The consolidation tools 3 may be continuous in the circumferential direction of the shaft, or may be spaced apart in the direction of the wrinkles as shown. For its installation, a spiral blade 5 is provided around the shaft so that the threading direction is toward the tip of the shaft.

The stirring blades 4, 4' are, for example, spaced apart in the longitudinal direction and circumferential direction of the shaft, and are alternately oriented in opposite directions, and the spiral blades 5 are also used for installation. There is. That is, the spiral blades 5 are cut out on both sides of the shaft 1 to provide blade pieces 6, and the blades 6 are provided on both sides of the shaft 1.
In No. 1, blade pieces 7 with opposite directions are provided between adjacent spiral blade portions, and stirring blades 4° 4' are constructed from these blade pieces 6.7.

A spiral blade 9 is provided around the base end portion 8 of the shaft, with the screwing direction being toward the tip end of the shaft.

#A cutter head 10 is installed at the tip of the auger shaft 1.
is installed.

As a whole, a consolidation tool 3° stirring blades 4, 4#,
The spiral blades 9 are in sliding contact, and the surfaces of the proximal end portion 8 of the shaft are kept close to each other for, for example, 100 m. However, the stirring blades 4, 4' may be short as long as they have the effect of stirring and kneading the excavated soil. Further, it is sufficient that the compaction tool 3 and the stirring blade 4 form a pair, and the stirring blade 4' is only used to facilitate the introduction of the kneaded material into the hole 111 between the hole and the circumferential surface of the shaft, and is not necessarily required. [Also.

[When carrying out the construction method of the present invention using such an auger, when the auger shaft 1 is rotated and pressed into the ground, the cutter head at the tip of the shaft will cut the cobblestones in the ground mixed with cobbles and boulders, and In bedrock, this is cut and continues to be drilled.

When a bad bentonite liquid is injected into such a hole by the cutter head 10, first, the stirring blade 4 sufficiently stirs and kneads the bentonite liquid and the excavated soil, and then the consolidation tool 6 deposits this kneaded material into the hole 11 km and I11. Contaminants still remaining in the hole are stirred and kneaded by the stirring blade 4' after the hole wall compaction in the first stage is carried out, and then the helical blade 9 of the shaft base end 8 is applied to the barrier 11t+ between the hole wall and the shaft surface. Insert it into the hole I by the circumferential surface of the cough shaft! As a result, the gravel etc. created by the cutting in the mixed material are forced into the hole wall of the pressure tube, thereby consolidating the hole wall in the second stage.

The construction method of the present invention has the above-mentioned configuration, and while consolidating the hole in 112 stages to prevent its collapse, the consolidating tool 6° spiral blades 9 can continuously perform linear drilling using the hole wall as a guide, and the excavation work can be carried out continuously. The efficiency of this method can be significantly improved compared to the conventional auger method (intermittent excavation method). By cutting the boulders, they can be effectively used as gravel, etc., which is effective for compaction of the hole wall in the second stage. In particular, the void ratio is approximately 60 in the loam layer.
``70 *e The density is about 55 to 45 in the sand layer, and about 25 to 35 in the gravel layer, but according to the present invention, the hole wall can be consolidated close to the consolidation limit of each layer. Since the pressure vIsK of the hole wall is used effectively, it is not discharged to the ground at all, or even if it is discharged, the amount is small, which makes the work site that much cleaner.Furthermore, since the hole wall is consolidated, However, the amount of bentonite liquid used is small, and in some cases it is possible to use spring water without using bentonite liquid.

[Brief explanation of the drawing]

The drawing shows the auger used in the construction method of the present invention, with the tip of the cutter head omitted and exemplified in the C construction situation. 1...11e auger shift, 2-...1 Curved shaft tip, 3 ... Consolidation tool, 4, 4'...
Stirring tool, 5... Spiral blade, 6, 7... Blade piece, 8... Shaft base end, 9... Spiral blade, 10... ...Cutter head. Procedural Supplement (Method) May 11, 1984 Indication of the case, 1982, Patent Application No. 181089 2, Name of the invention: Auger construction method 3, Relationship with the case of the person making the amendment: Address of the person making the amendment Matsuzawa - Name 4, Agent 5, Fissu of the attached sheet with the date of the amendment order, # Arrived 1 direction (No alteration on the inner diameter).

Claims (1)

[Claims] After cutting and drilling, and then stirring and mixing the excavated earth and sand with a bentonai chest, etc., this kneaded material is applied to the hole 11 and pressed further, and the mm earth and sand is used for compaction of the hole without being discharged to the ground. The auger construction method is characterized by: