JP-7854692-B1 - Survey boring method

Abstract

[Problem] To provide a low-cost and accurate investigative boring method for detecting the presence of voids and air pockets in the ground. [Solution] A first hole 11 with a first diameter D1 is drilled into the ground 1 to be investigated, an injection material 2 is injected into the first hole 11 via a first bag 7, a second hole D2 with a larger diameter D1 is drilled around the first hole 11 concentrically with the first hole 11, and the core drilled by the core boring is taken as the first sample S1. [Selection Diagram] Figure 4

Inventors

• 山本 浩之
• 小林 英彦
• 野田 浩司

Assignees

• 国土防災技術株式会社
• 株式会社カテックス

Dates

Publication Date

20260507

Application Date

20251223

Claims (6)

1. A first borehole of the first diameter is drilled into the ground targeted for investigation. A long first bag, comprising an inner layer having water permeability and water retention properties and an outer layer having water permeability, is inserted so as to extend along the first hole. An injection material that foams and hardens at a controlled time is injected into the previous first bag and allowed to foam and harden. A core boring hole is drilled around the first hole, concentric with the first hole and with a second diameter larger than the first diameter. A survey boring method in which the core drilled by the aforementioned core boring is taken as a first sample.
2. A cylindrical casing with a diameter corresponding to the diameter of the second hole is inserted into the second hole from which the core was removed and installed. A center riser for guiding the boring rod is inserted into the aforementioned cylindrical casing and installed. Using the boring rod guided by the center riser, a third hole of the first diameter is drilled into the bottom surface of the second hole. A long second bag, comprising a water-permeable and water-retentive inner layer and a water-permeable outer layer, is inserted so as to extend along the third hole, and the injection material is injected into the second bag and allowed to foam and harden. A core boring hole is drilled around the third hole, concentric with the third hole and having a second diameter larger than the first diameter. The investigation boring method according to claim 1, wherein the core drilled by the core boring method is taken as a second sample.
3. The first bag is provided so as to surround the outer surface of a long first tube having a first through hole, The upper end of the first bag is liquid-tightly fixed to the upper end of the first tube, and the lower end of the first bag is liquid-tightly fixed to the lower end of the first tube. The investigation boring method according to claim 1 or 2, wherein the injection material is injected from the upper end of the first pipe, passes through the first through hole of the first pipe, and is injected into the first bag.
4. The second bag is provided so as to surround the outer surface of the elongated second tube having a second through hole, The upper end of the second bag is liquid-tightly fixed to the upper end of the second tube, and the lower end of the second bag is liquid-tightly fixed to the lower end of the second tube. The investigation boring method according to claim 2, wherein the injection material is injected from the upper end of the second pipe, passes through the second through hole of the second pipe, and is injected into the second bag.
5. The investigation boring method according to claim 3, wherein the first through-hole is provided in close proximity to the upper end of the first pipe body.
6. The investigation boring method according to claim 4, wherein the second through-hole is provided adjacent to the upper end of the second pipe body.

Description

Applicable to Article 30, Paragraph 2 of the Patent Law. Published August 1, 2025, hosted by the Japan Society of Civil Engineers, Proceedings of the 80th Annual Scientific Conference of the Japan Society of Civil Engineers, 2025. [Publications, etc.] Held September 12, 2025, hosted by the Japan Society of Civil Engineers, 2025. This invention relates to an exploratory boring method, and more particularly to an exploratory boring method for visualizing voids and air pockets in the ground. The applicants in this case proposed the investigation boring method described in Patent Document 1 as a low-cost, accurate method for visualizing and investigating naturally occurring or artificial cavities and voids in the ground. Patent No. 7373108 This is a cross-sectional view (part 1) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 2) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 3) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 4) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 5) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 6) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 7) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 8) showing one embodiment of the investigation boring method according to the present invention.This is a cross-sectional view along the IX-IX line in Figure 1.This is a cross-sectional view along the line X-X in Figure 5.This is a cross-sectional view along the line XI-XI in Figure 4.This is a cross-sectional view along the line XII-XII in Figure 6.This is a cross-sectional view along the line XIII-XIII in Figure 6.This is a cross-sectional view along the line XIV-XIV in Figure 8.This is a cross-sectional view (part 1) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 2) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 3) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 4) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (No. 5) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (part 6) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (No. 7) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (No. 8) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (9) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (10) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (No. 11) showing another embodiment of the investigation boring method according to the present invention.This is a cross-sectional view (No. 12) showing another embodiment of the investigation boring method according to the present invention.This is a front view showing the first bag used in the investigation boring method according to the present invention.This is a cross-sectional view along the line XXVIII-XXVIII in Figure 27.This is a longitudinal cross-sectional view showing the first bag and the first pipe used in the investigation boring method according to the present invention.This is a cross-sectional view along the line XXX-XXX in Figure 29.This is a longitudinal cross-sectional view showing how the injection material injected into the first pipe used in the investigation boring method according to the present invention spreads throughout the first bag. 《First Embodiment》 Hereinafter, examples of embodiments for carrying out the present invention will be described with reference to the drawings. Figures 1 to 8 are cross-sectional views showing one embodiment of the investigation boring method according to the present invention, Figure 9 is a cross-sectional view along the line IX-IX in Figure 1, Figure 10 is a cross-sectional view along the line XX in Figure 5, Figure 11 is a cross-sectional view along the line XI-XI in Figure 4, Figure 12 is a cross-sectional view along the l