JP2012021390A - Method of constructing steel pipe pile foundation, and head of drilling insertion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of well adapting to conditions such as ground and enabling short construction time and low environmental load, while complementing a conventional construction method in which a structure foundation pile works by installing an steel pipe is difficult in a location with a narrow delivery road or workspace due to intended use of large construction vehicles and machines.SOLUTION: The construction method comprises the steps of: using a compact boring machine which can be carried by man power as a main insertion drilling apparatus; fixing a steel pipe equipped with a drill bit on its tip into intimate contact with a rubber gasket in a head part (a steel pipe pile head) capable of supplying water from a hollow upper rod by pressurization; inserting the steel pipe by drilling with itself to a prescribed depth; and leaving the steel pipe in place to form a foundation pile of a structure. The construction method enables effective use of a location where construction or reconstruction of a structure is difficult due to the impossibility of structure foundation pile works.

Description

  The present invention mainly employs a small boring machine that can be carried in manually even if the width of the loading path and the work space that are difficult to construct by the conventional method are narrow and the working space is narrow, and the steel pipe is driven as the foundation pile of the structure. The present invention relates to a construction method made possible by this, and the structure of the head portion of the excavation and insertion device used in the construction method.

  There are two methods for driving steel pipes as foundation piles of structures: a method of driving steel pipes into holes drilled with augers, casings, core tube heads, etc., or a method of driving steel pipes directly using a vibro hammer or building pole car. Can be broadly divided.

  However, the method of inserting the steel pipe pile into the excavation hole is a two-stage process, which requires a lot of equipment and work space and requires a long construction period. In addition, a considerable amount of labor is required for disposal of excavated soil and muddy water. On the other hand, even in the direct driving method, the vibro hammer cannot avoid the problems of noise and vibration, and when using a construction car, a corresponding work space is required. In addition, in the direct driving method, there is a weak point that steel pipe piles cannot be driven to a sufficient depth on the ground where there is a boulder or the like.

  The biggest problem of the conventional method is that it is premised on the use of large construction vehicles and equipment, so it is difficult to construct the structural foundation pile by casting steel pipes in places where the width of the carry-in route and the work space are narrow. Even relatively small equipment has a weight of 100 kilograms and cannot be installed in places where the means of transportation is limited to human power.

  As a supplement to the conventional method, a small boring machine that can be transported by human power is the main excavation and insertion device, and a drilling bit is attached to the tip of the head part (steel pipe pile head) that can supply pressurized water from the hollow upper rod. There is a method of fixing a steel pipe, excavating and inserting the steel pipe itself up to a predetermined depth, and burying it as it is to make a foundation pile of a structure. FIG. 1 is a general view of this method, and FIG. 2 is a schematic view of a steel pipe pile head.

  The problem to be solved is that the conventional construction method assumes the use of large construction vehicles and equipment, so it is difficult to construct foundation piles by placing steel pipes in places where the width of the carry-in route and the work space are small. is there. In addition, the conventional method of inserting a steel pipe into a drilling hole has many problems such as residual soil and muddy water treatment, and the method of direct driving a steel pipe has many restrictions such as noise, vibration and ground conditions.

  The present invention uses a small boring machine that can be transported by manpower as the main insertion drilling device, and fixes a steel pipe with a drilling bit attached to the head part (steel pipe pile head) that can supply pressurized water from a hollow upper rod. The most important feature is that the steel pipe itself is excavated and inserted to a predetermined depth and buried as it is to make the foundation pile of the structure.

  The present invention uses a small and simple steel pipe pile excavation and insertion device that can be transported by human power, so that the construction method can be built (rebuilt) that cannot be handled by the conventional method due to the narrow width of the loading path and the work space. This makes it possible to effectively use difficult places. In addition, because the present invention is excavated and inserted with the steel pipe itself used as the foundation pile, the construction period is short compared to the conventional method, and it has a low environmental load (significantly reduces residual soil and muddy water treatment). Is possible.

Figure 1 is an overall view Fig. 2 is a schematic view of a steel pipe pile head

1. 1. Boring machine 2. Steel pipe pile head Rod 4. 4. Pressurized water pump Steel pipe piles 6. Tip bit

  A small boring machine that can be transported by human power is the main excavation and insertion device, and a steel pipe with an excavation bit at the tip is fixed to the head. The head part (steel pipe pile head) has a structure in which a replaceable rubber packing is attached to a part in contact with the upper end of the steel pipe to be fixed so that pressurized water can be supplied from the hollow upper rod.

  The steel pipe itself is drilled and inserted to a predetermined depth by applying rotation to the steel pipe while supplying water through a hollow upper rod, and welding or adding a steel pipe with a thread groove at the end. After reaching a predetermined depth, the steel pipe remaining on the ground surface is cut to a predetermined length, and buried as it is to form a foundation pile for the structure.

The present invention uses a small and simple steel pipe pile excavation and insertion device that can be transported by human power, so that the construction method can be built (rebuilt) that cannot be handled by the conventional method due to the narrow width of the loading path and the work space. This makes it possible to effectively use difficult places. In addition, because the present invention is excavated and inserted with the steel pipe itself used as the foundation pile, the construction period is short compared to the conventional method, and it has a low environmental load (significantly reduces residual soil and muddy water treatment). Is possible.

Claims (2)

  A small boring machine that can be transported by human power is the main excavation and insertion device, and a steel pipe with a drilling bit attached to the tip is fixed to the head part where pressurized water can be supplied, and excavated and inserted to a predetermined depth by pressurized water digging. The construction method is to make the foundation pile of the structure by burying it as it is.   The structure of the head part of the excavation and insertion device used in the construction method described in the previous section, in which a replaceable rubber packing is attached to the part in contact with the upper end of the steel pipe to be fixed, so that pressurized water can be supplied from the hollow upper rod.

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