JP2007191879A - Boring method selecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boring method selecting method for easily selecting an appropriate boring method in a slope stabilizing method for stabilizing the ground while leaving standing trees which have grown on the slope. <P>SOLUTION: In a first step S01, whether the standing trees exist is determined, and if no standing tree exists, it is regarded as outside the object. In a second step S02, whether the density of the standing trees is denser or sparser than a predetermined reference is determined, and if sparser, it is regarded as outside the object. In a third step S03, whether non-self-support of hole walls is clear is determined, and if non-self-support is clear, a double pipe boring method is selected. In a fourth step S04, whether self-support of the hole walls is clear is determined, and if self-support is not clear, a self-boring method is selected. In a fifth step S05, whether a borehole length is longer or shorter than a predetermined value is determined, and if longer, the self-boring method is selected, while if shorter, a single pipe boring method is selected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drilling selection method that has been developed so that an appropriate drilling method can be selected more easily in a slope stabilization method that stabilizes trees while leaving standing trees growing on a slope.

  2. Description of the Related Art Conventionally, as a ground stabilization means for natural slopes and artificial slopes, a construction method in which an anchor material is installed on a slope, and further stabilization means is applied using the anchor material. The installation of the anchor material requires a drilling operation for forming an installation hole in the target ground in advance, but the selection of the drilling method used for the drilling operation is difficult. It was very important because it had a big impact. However, there are various conditions for drilling conditions such as geology in the target ground for stabilization, and there are many cases where it is not possible to make a clear judgment as to whether the hole wall formed in the target ground can be self-supported. It is not easy to select an appropriate drilling method that can be adapted to. In particular, it was difficult to select an appropriate drilling method in the slope stabilization method that stabilizes trees while leaving the standing trees on the slope.

Conventionally, some design support means for determining the placement and construction method of the anchor material when stabilizing the slope using the anchor material have been disclosed (see Patent Document 1). I didn't get it.
JP 2005-248501 A

  The present invention has been developed in view of the above-described conventional technical situation, and is more easily and appropriately used in a slope stabilization method that stabilizes the ground while leaving standing trees on the slope. An object of the present invention is to provide a method for selecting a drilling method that can select a hole method.

  In order to solve the above-mentioned problem, in the invention of claim 1, it is determined whether or not standing trees are present, and if present, the process proceeds to the next step, and if not, the first step is excluded. It is judged whether the density of the standing trees is denser or sparser than a predetermined setting standard. If dense, the process proceeds to the next step. If the independence is obvious, select the double-pipe drilling method. If the independence is not obvious, proceed to the next step and whether the hole wall is self-supporting. If self-supporting is not clear, select the self-drilling drilling method, and if self-supporting is obvious, the fourth step to proceed to the next step, and whether the drilling length is longer than a preset value Judge whether it is short, if it is long, select the self-drilling method, if it is short Adopted selection method of selecting a drilling method using a fifth step of selecting a single pipe drilling system. Further, in the invention of claim 2, a double-pipe drilling method is added as a selection target in the fourth step, and it is determined whether or not standing trees are present. In the case where the sparse density of the standing trees and the sparse density of the standing trees are denser or sparser than a predetermined setting standard, the process proceeds to the next step. The second step determines whether or not the independence of the hole wall is obvious. If the independence is obvious, the double-pipe drilling method is selected. If the independence is not obvious, proceed to the next step. 3 steps and whether or not the self-supporting of the hole wall is obvious. If self-supporting is not clear, select the self-drilling drilling method or double-pipe drilling method, and if self-supporting is obvious, the next step 4th step to go to step 4, and whether the drilling length is longer than a preset value It determines squid, if long selects the self drilling drilling method, when short adopted selection method of selecting a drilling method using a fifth step of selecting a single pipe drilling system. The set value in the fifth step is set to 3 m, for example, as in claim 3. Here, the term “independence of the hole wall” refers to a state in which the hole wall formed by the drilling operation is not independent. In addition, the self-drilling drilling method refers to a method in which the single pipe itself is used as an anchor material as it is excavated by a drilling means provided at the tip of the single pipe. Refers to a single pipe drilling method other than.

  According to the drilling method selection method according to the present invention, including the case where it is not clear whether the hole wall of the drilled hole formed in the stabilization target ground can be self-supporting or not self-supporting. It is possible to easily and accurately select an appropriate drilling method that can be adapted to the stabilization target ground according to the situation that is known regarding the independence and independence of the soil.

  Various settings can be made with respect to the setting criteria regarding the density of standing trees in the second step of the present invention. This setting criterion is that the density of standing trees growing on the stabilization target ground does not greatly restrict the installation of the scaffold for drilling work, for example, a conventional drilling device having a drilling diameter exceeding 90 mm is used. In a state where it can be applied without difficulty, it is set to be excluded from the application of this selection method as out of the target. There are various specific display methods for representing the density of standing trees. For example, the ratio of the projected area of the canopy indicating the forest closing density is used, and when the ratio is 5/10 or less, “sparse”, when 6/10 to 8/10, “medium”, 9/10 In the above cases, there are some that are classified as “dense”. The ratio of the average tree distance to the average tree height is also an indicator of the sparse density of standing trees, and the relative trunk distance = 10000 / (H × √N) (where H: average tree height (m), N: number density (books) / Ha)), when the relative trunk distance is 25% or more, “sparse”, 15% or more and less than 25%, “medium”, and less than 15%, “dense” Some will do. Further, the yield ratio (RY) is used. When the RY is less than 0.55, it is “sparse”, when it is 0.55 or more and less than 0.7, “medium”, and when it is 0.7 or more, Some are classified as “dense”. In setting the setting criteria in the second step, it is possible to set by using an appropriate display method representing the sparse density of the trees, evaluation based on a single display method, or a combination thereof May be comprehensively evaluated. In the setting related to the setting criteria in the second step, when the sparse density of the trees is equal to the setting criteria, the setting may proceed to the third step or may be set so as not to be the target. Good. Similarly, in the setting related to the set value in the fifth step, when the drilling length is equal to a predetermined set value, the self-drilling drilling method may be selected, or the single-pipe drilling method may be selected. It may be set to select.

  Next, a drilling method selection flow in the invention of claim 1 will be described with reference to FIG. First, in the first step S01, it is determined whether or not standing trees exist on the stabilization target ground, and if present, the process proceeds to the second step S02. If there are no standing trees on the stabilization target ground, it will be excluded from this selection method. Next, in a second step S02, it is determined whether or not the sparse density of the standing trees is denser than a predetermined setting standard. The setting standard in this case is, as described above, the density of standing trees (the distance between trees, etc.) growing on the stabilization target ground does not greatly restrict the installation of a scaffold for drilling work, for example, It is set in advance from the viewpoint of determining whether or not a conventional drilling device having a drilling diameter exceeding 90 mm can be applied without difficulty. If it is denser than the setting criterion, the process proceeds to the third step S03. If the density of standing trees on the target ground is sparser than the setting criterion, it is excluded from this selection method.

  In a third step S03, it is determined whether or not the hole wall is not self-supporting. If it is clear that the hole wall is not self-supporting, that is, the hole wall is not self-supporting, the double-pipe drilling method is selected. By selecting this double-pipe drilling method, stable drilling work is possible even if the hole wall is not self-supporting, and a good fixing state in which the grout material is accurately filled around the anchor material is obtained. Incidentally, as the double pipe drilling method mentioned here, from the relationship with the setting standard in the second step S02, for example, when a drilling device having a drilling diameter exceeding 90 mm can be applied without difficulty, it is out of the scope of this selection method. In this case, a double-pipe drilling device for small caliber having a drilling diameter of 90 mm or less is applied. If it is not clear that the hole wall is not independent, the process proceeds to the fourth step S04.

  In the fourth step S04, it is determined whether or not the self-supporting of the hole wall is obvious. Select the self-drilling method to be used as the material. If it is clear that the hole wall is self-supporting, the process proceeds to step S05, where it is determined whether or not the drilling length is a preset value, for example, 3 m or less. If the drilling length is 3 m or less, single pipe cutting is performed. Select the hole method, and if longer than that, select the self-drilling method. In other words, when the drilling length is longer than the set value, the self-drilling drilling method is selected in which the single pipe is left as an anchor material and the single pipe is not pulled out.

  FIG. 2 shows a selection flow of the drilling method in the invention of claim 2. As shown in the figure, the embodiment of the invention according to claim 2 is the drilling method selected when the self-supporting of the hole wall is not obvious in the fourth step S04, compared with the embodiment according to claim 1. A difference is that a double-pipe drilling method is added to the self-drilling drilling method, and one of these drilling methods can be selected depending on the case. There is no difference in other points, and the same selection function is achieved. Incidentally, in the above selection flow of FIG. 1 or FIG. 2, it is possible to add another step upstream of the first step S01, downstream of the fifth step S05, or between each step.

FIG. 3 is a flowchart showing a selection flow of a drilling method in the invention of claim 1. It is the flowchart which showed the selection flow of the drilling system in invention of Claim 2.

Explanation of symbols

S01 ... 1st step, S02 ... 2nd step, S03 ... 3rd step, S04 ... 4th step, S05 ... 5th step

Claims (3)

  It is determined whether or not a standing tree exists, and if it exists, the process proceeds to the next step. If it does not exist, the first step to be excluded and the sparse density of the standing tree are denser than a predetermined setting standard. If it is dense, proceed to the next step. If it is sparse, determine whether the second step to be excluded and whether the independence of the hole wall is obvious. Selects the double-pipe drilling method, and if the independence is not clear, determines whether the third step proceeds to the next step and whether the hole wall is self-supporting. Select the drilling method, and if self-supporting is obvious, determine the fourth step to proceed to the next step and whether the drilling length is longer or shorter than the preset value. And a fifth step of selecting a single pipe drilling method if it is short. Drilling method selecting method, characterized in that.   It is determined whether or not a standing tree exists, and if it exists, the process proceeds to the next step. If it does not exist, the first step to be excluded and the sparse density of the standing tree are denser than a predetermined setting standard. If it is dense, proceed to the next step. If it is sparse, determine whether the second step to be excluded and whether the independence of the hole wall is obvious. Selects the double-pipe drilling method, and if the independence is not clear, determines whether the third step proceeds to the next step and whether the hole wall is self-supporting. Select the drilling method or double tube drilling method, and if self-supporting is obvious, determine whether the drilling length is longer or shorter than the preset value and the fourth step to proceed to the next step. If so, select the self-drilling method. If it is short, select the single-drilling method. Drilling method selecting method which comprises 5 steps. The drilling method selection method according to claim 1 or 2, wherein the set value is set to 3 m.

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