JP3722473B2 - Drilling element - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavating element propelled into the ground.
[0002]
[Prior art]
Conventionally, in the case of construction work of three-dimensional intersection tunnel under the track, bridge construction, etc., the ground is made by the cutter placed at the tip of the element while pushing (or towing) and inserting the cylindrical steel element into the ground The soil is excavated and the adjacent elements are connected to each other with joints to make a protective work (tunnel lining body), or a structure is constructed. For example, as shown in FIG. 6, the foundations of the pier 2 are constructed by sequentially connecting the steel elements 1 by connecting them with joints. The steel element 1 used here consists of a steel pipe having a single-section structure with a rectangular cross section, as shown in FIG. 7A (side view) and FIG. 7B (cross section), for example.
[0003]
[Problems to be solved by the invention]
In the conventional single-structure element shown in FIG. 7, depending on the conditions, the section yield strength of the element may be insufficient as a member at the time of construction or completion. In such a case, it was necessary to compensate for the lack of proof stress by enlarging the element or tensioning the PC steel wire 4 like the bridge 3 shown in FIG.
[0004]
An object of the present invention is to solve the above-described problems, and an object of the present invention is to compensate for a lack of proof strength of an element at a lower cost than in the past.
[0005]
[Means for Solving the Problems]
The present invention relates to a long excavation element having a rectangular cross section, wherein a reinforcing material is welded, bolted, or bonded to the inside of one or more of the upper and lower surfaces, both side surfaces, and both end surfaces of the element. It is characterized by being joined to form a multiple structure.
Further, the present invention is characterized in that in a long excavation element having a circular cross section, a reinforcing material is joined to the inside of the element by welding, bolting, or an adhesive to form a multiple structure.
Further, the present invention is characterized in that the reinforcing material is attached before excavation construction, during construction, or after construction.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
1A and 1B are diagrams illustrating an excavating element according to the present invention, in which FIG. 1A is a side view and FIG. 1B is a cross-sectional view.
The steel element 10 has a rectangular cross section, and a reinforcing member 11 made of a plate or the like is attached to the end surface portion thereof by welding, bolting, adhesive, or the like to form a multiple structure. This attachment is performed according to the conditions before excavation construction, during construction, or after construction. Of course, not only one reinforcing material 11 but also two or more reinforcing materials 11 may be joined as required. Since the element is excavated and propelled (or towed) through the ground, both ends of the element are opened, and a plate is joined to both ends after excavation and propulsion is completed to form a multiple structure. The distance from the end face of the reinforcing material 11 is appropriately set according to the length of the entire element. Although not shown in the figure, a joint is formed along the longitudinal direction of the element and is engaged with a joint of an adjacent element to form a bridge pier foundation or a box-shaped crossing structure as shown in FIG. To do. Although only one end portion is shown in the figure, the other end is similarly configured as a multiple structure. Thus, the cross-sectional yield strength can be improved by forming the end portion with a multiple structure.
[0007]
2A and 2B are diagrams for explaining another example of the excavating element of the present invention. FIG. 2A is a side view and FIG. 2B is a cross-sectional view.
The element 10 in this example has a multiple structure in which a reinforcing member 12 is attached in parallel to the upper surface, lower surface, or side surface of the element by welding, bolting, adhesive, or the like. Also in this example, a plurality of reinforcing materials 21 may be joined as necessary.
[0008]
3A and 3B are diagrams for explaining another example of the excavating element of the present invention. FIG. 3A is a side view and FIG. 3B is a cross-sectional view.
In the element 10 in this example, a reinforcing material 11 is joined to an end portion, and a reinforcing material 12 is joined in parallel to an upper surface, a lower surface, or a side surface. Also in this example, a plurality of reinforcing members 11 and 12 may be joined as necessary, and the reinforcing members 12 may be provided on two or more surfaces of the upper surface, the lower surface, or the side surfaces.
[0009]
4A and 4B are diagrams for explaining another example of the excavating element of the present invention. FIG. 4A is a side view and FIG. 4B is a cross-sectional view.
The steel element 20 has a circular cross section, and a reinforcing member 21 made of a plate or the like is attached to the end face portion thereof by welding, bolting, an adhesive or the like to form a multiple structure, except that the cross section is circular. It is the same as the case of.
[0010]
5A and 5B are diagrams for explaining another example of the excavating element of the present invention. FIG. 5A is a side view and FIG. 5B is a cross-sectional view.
The element 20 has a circular cross section, and a reinforcing material 21 is joined to the end portion, and a reinforcing material 22 is joined to the center in parallel to the element axial direction.
[0011]
【The invention's effect】
As described above, according to the present invention, the reinforced structure is provided on the upper and lower surfaces, both side surfaces, both end surfaces, etc. of the excavating element so that the element has insufficient proof strength at a lower cost than the conventional one. It is possible to compensate.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a rectangular section excavating element according to the present invention.
FIG. 2 is a diagram illustrating another example of a rectangular section excavating element according to the present invention.
FIG. 3 is a diagram for explaining another example of a rectangular section excavating element according to the present invention.
FIG. 4 is a diagram illustrating an example of a circular excavation element according to the present invention.
FIG. 5 is a diagram illustrating another example of a circular excavation element according to the present invention.
FIG. 6 is a diagram illustrating an example of bridge reconstruction.
FIG. 7 is a diagram illustrating a conventional excavating element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Element with a rectangular cross section, 11, 12 ... Reinforcing material, 20 ... Element with a circular cross section, 21, 22 ... Reinforcing material.

Claims (3)

In a long excavation element with a rectangular cross section, a reinforcement is joined to one or more of the upper and lower surfaces, both side surfaces, and both end surfaces of the element by welding, bolt bonding, or adhesive, and multiplexed. Excavation element characterized by having a structure. A long excavation element having a circular cross section, wherein the excavation element has a multiple structure by joining a reinforcing material to the inside of the element by welding, bolting, or an adhesive . The reinforcing material is pre-drilling construction, according to claim 1 or 2 drilling element according to, characterized in that mounted in construction, or after construction.

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