JPH0454763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to various steel pipe pile joining methods employed in the fields of civil engineering, architecture, marine structures, and the like.

(Prior art) As is well known, in industrial fields such as civil engineering, architecture, and marine structures, all structures have become huge, and the materials used for them have also become larger. Demand for large-diameter and long steel pipe piles has been increasing, but there are limits to the lengthening of steel pipe piles due to many restrictions such as production equipment conditions and transportation conditions. Various methods have been adopted to connect the piles.

As a joint pile method, there are methods such as providing a flange at each pipe end and joining them with bolts, using multiple joint plates and joining each pipe end with rivets or bolts, or using rib plates to join them with bolts. Generally adopted.

Furthermore, as shown in Fig. 6, a groove 2 is provided on the pipe end 1a of the trailing steel pipe pile 1, and the pipe end 3a of the preceding steel pipe pile 3 is brought into contact with the pipe end 3a to be welded. A method of welding the trailing steel pipe pile 1 and the leading steel pipe pile 3 using joint plates 4a to 4c, or after welding the trailing and leading steel pipe piles 1 and 3 as shown in FIG. Connect the upper sleeve fitting 5 to the joint 6
The round bars 7a and 7b are attached to the cylindrical sleeve fitting 5, the trailing steel pipe pile 1 and the leading steel pipe pile 3.
A joint pile method in which mortar grout is injected into the gap 8 while interposing and welding the top and bottom of the gap 8 with the gap 8 is described in a civil engineering construction method course published by Sankaido Co., Ltd. on November 20, 1971. The erosion control/landslide prevention construction method for preventing collapse of steep slopes is described on page 429.

(Problems to be Solved by the Invention) The present inventors have identified various improvements that should be made in conventional methods when connecting steel pipe piles in civil engineering work that employs long steel pipe piles, particularly in landslide prevention pile construction work. I knew there was a problem.

For example, in the connecting pile method that uses protrusions such as the flanges mentioned above, the flanges protrude from the outer periphery of the steel pipe pile, which can easily become an obstacle when inserted into a vertical hole previously drilled in the ground. Appropriate.

Furthermore, the contact welding shown in FIG. 6 has a problem in that it cannot provide highly reliable results in terms of quality in on-site work such as landslide prevention pile construction. That is, to construct landslide prevention piles, as shown in Fig. 9, a boring scaffold 10 is constructed on a steep slope 9, a vertical hole 11 is bored using a boring machine (not shown), and then a crane (not shown) is used to construct a landslide prevention pile. ) and using the boring scaffold 10, the steel pipe piles 12a, 12b,
Vertical hole 11 is connected by welding machine 13 to 12c.
However, due to the adverse conditions of the working environment, welding defects occur even after careful welding.
Quality standards are often not met, and especially when high-tensile steel pipes are used for steel pipe piles, quality problems occur in the welds and surrounding heat-affected areas.
Solving this problem is extremely difficult both technically and economically.

Furthermore, the method using the joint plates 4a to 4c shown in FIG. 7 also has the same problems as the case shown in FIG. 6.

Next, although the method shown in Fig. 8 has been improved in that the quality problem of the contact welded joint 6 is compensated for by using the cylindrical sleeve fitting 5, a new quality problem is added to the welded part with the round bars 7a and 7b. In addition to the problems shown in Figure 6,
A common problem with the method shown in Figure 7 is that it is surprisingly difficult to connect the leading and trailing steel pipe piles so that they align with each other on the same axis, and a phenomenon called so-called misalignment is likely to occur. has been done.

The present invention reduces the problem of defects caused by welding as described above, eliminates the possibility of misalignment,
The purpose of the present invention is to provide a method for connecting steel pipe piles that has high joint strength, excellent reliability, easy construction, and high economic efficiency.

(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the purpose, the present invention connects a leading steel pipe pile and a trailing steel pipe pile in an upright position, and then connects the leading and trailing steel pipe piles. A steel pipe pile joint in which a cylindrical sleeve metal fitting having an inner diameter larger than the outer diameter is loosely fitted into the steel pipe pile joint part, and then an adhesive solidifying material is filled between the outer surface of the steel pipe pile and the inner surface of the cylindrical sleeve metal fitting. A pile method, in which the joint pile pipe end is formed in advance into a seal joint with the same outer diameter having a groove on the outer abutment surface, and after the joint is fitted, the outer abutment surface is welded around the entire circumference or partially welded. This is a method for joining steel pipe piles, which is characterized by welding.

(Function) The present invention relates to a joint pile, in which the pipe end of the joint pile is formed in advance into a seal joint with the same outer diameter having a groove on the outer abutment surface, and after the joint is fitted, the outer abutment surface is fully or partially welded. Therefore, they can be perfectly aligned on the same axis, and there is no fear of misalignment. In addition, the outer abutment surfaces are welded to accommodate the tensile load required to temporarily join the leading and trailing steel pipe piles, and then the leading and trailing steel pipe piles are joined by bonding the cylindrical sleeve fitting and the steel pipe pile, which will be described later. This completes the process, resulting in high bonding strength and superior quality results.

Further, since the outside of the steel pipe pile only protrudes by the height of the cylindrical sleeve metal fitting, there is no problem when building it into a vertical hole, and construction efficiency is high.

Furthermore, since there is little welding work and the main method is adhesion, construction is simple and work can be done efficiently and reliably even in adverse environments.

(Example) Fig. 1 shows a state immediately before fitting a leading steel pipe pile 15 having a male joint 14 of the same outer diameter stamped joint at the pipe end and a trailing steel pipe pile 17 having a female joint 16 of the same diameter stamped joint at the pipe end. 2, 18 is a groove for welding provided on the trailing steel pipe pile 17, and the details of the outer diameter stamped joint are shown in FIG. 2 for easy understanding. In FIG. 2, parts with the same reference numerals as in FIG. 1 are the same members, so some explanations will be omitted.

The same outer diameter stamped joint used in the present invention has the same outer diameter as the leading and trailing steel pipe piles 17 and 15 after the joint is fitted, and the female joint has a larger diameter like a normal stamped joint. do not have. This may become an obstacle when fitting the cylindrical sleeve metal fitting, as will be described later.
This is to avoid hindrance to filling the adhesive solidifying material.

Further, in this embodiment, the outer diameter stamped joint is a tapered joint, but the present invention is not limited to this, and the taper may not be provided. However, a tapered joint makes the fitting work easier and improves efficiency during construction.

When the tube end is made of a seal joint in this way, alignment is completed only by fitting, so there is no need to use a jig or tool for alignment as in the past.

Next, the tip 16 of the female joint 16 of the trailing steel pipe pile 17
A groove 18 is provided at the male joint 1 of the preceding steel pipe pile 15.
Welding is performed between the proximal ends 14a of 4, but originally the tip 1
6a and the base end 14a are surfaces that should be in contact with each other, and in this sense, both are referred to as contact surfaces in the present invention.

The angle of the groove 18 is determined to be approximately 10 to 70 degrees in consideration of the dimensions, strength, etc. of the steel pipe pile, and the angle of the base end 14a is approximately horizontal, but when welding, well-known It is possible to use metal fittings to prevent dripping. Hereinafter, in the present invention, both will be collectively referred to as a groove. In this embodiment, the leading steel pipe pile 15 is provided with a male joint 14, and the trailing steel pipe pile 17 is provided with a female joint 16, but it is also possible to reverse the sexes and provide a groove and weld. As is clear from this, in the present invention, the bevel is always located on the outside. Therefore, in the present invention, a groove is provided on the outer contact surface in the above-mentioned relationship.

In FIG. 2, 19 indicates weld metal. As is clear from the figure, the welding in the present invention is approximately half the thickness of the steel pipe pile or less, so even if the steel pipe piles are welded together partially or entirely, it is only a partial weld. That is, it is only temporary welding, and its strength is sufficient to support the load of the preceding steel pipe pile, and the bending, shearing, and tensile forces acting on the steel pipe pile are handled by the cylindrical sleeve metal fitting described later.

3, 4, and 5 are explanatory diagrams showing the steps of the pile connecting method. As shown in FIG. 3, on the boring scaffold 10 is a gripping device 2 that freely grips the steel pipe pile.
0 is fixed and grips a preceding steel pipe pile 15 built in a vertical hole (not shown). 21 is an annular bracket fixed to a predetermined position of the preceding steel pipe pile 15;
A cylindrical sleeve fitting 22 is supported as described below.

The cylindrical sleeve metal fittings 22 are the leading and trailing steel pipe piles 1
It is made of a steel pipe having an inner diameter slightly larger than the outer diameter of the pipes 7 and 15, for example, approximately 4 to 10 mm in diameter, and is held on the trailing steel pipe pile 17 by a fall prevention band 23 in advance with a crane (not shown). 1) and suspended on the preceding steel pipe pile 15 so as to be able to rise and fall freely. Next, the trailing steel pipe pile 17 is gradually suspended, the seal joint is fitted, and the outer abutment surface 24 is welded as shown in FIG.

Next, the fall prevention band 23 is loosened and the cylindrical sleeve metal fitting 22 is lowered until it comes into contact with the receiving metal fitting 21. A predetermined gap, for example 2, is provided between the cylindrical sleeve metal fitting 22 and the preceding steel pipe pile 15 in the fall prevention band 23.
By providing a spacer function that maintains a gap of ~5 mm, the desired gap can be maintained. Next, when gap retaining pieces 25a and 25b are interposed in the upper inner cavities of the trailing steel pipe pile 17 and the cylindrical sleeve metal fitting 22, the cylindrical sleeve metal fitting 22 and the leading and trailing steel pipe piles 17,
15 creates a gap with the exact dimensions desired.

Next, a through hole 26 with a small diameter, for example, 5 to 10 mm, is provided in advance in the cylindrical sleeve fitting 22, and an adhesive solidifying material, such as an epoxy adhesive, is injected through the through hole 26 in an amount that fills the gap.
The leading and trailing steel pipe piles 17, 15 and the cylindrical sleeve fitting 22 are completely integrated. The present inventors have obtained good results using a two-component, room-temperature-setting adhesive in which a curing agent is added to an epoxy resin.

In addition, the present inventors repeatedly conducted tensile, bending, and shear tests on steel pipe piles that had been joined as described above, and found that results equivalent to or even better than conventional methods were obtained, and the practicality of the method of the present invention was improved. We were able to prove our superiority.

Since the method of the present invention does not perform main welding during joining, it is possible to use seamless steel pipes of high tensile strength steel that are extremely difficult to weld. This makes it possible to replace structural carbon steel pipes and significantly improve economic efficiency.

(Effects of the Invention) The method of connecting steel pipe piles of the present invention is easy to work with, so it is suitable for construction in places with extremely poor environments.In addition, high-tensile steel pipes, which have been difficult to use, can be used, making it more economical. In addition to making it possible to achieve exceptional improvements, it also enables construction of long steel pipe piles with no quality defects and high reliability in terms of mechanical joint strength, so its practical effects are extremely significant.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the state of the same outer diameter stamped joint according to the present invention before fitting, Fig. 2 is a partial sectional view of the same outer diameter stamped joint, and Figs. 3, 4, and 5 are the joint pile method. Figures 6, 7, and 8 are diagrams showing the conventional joint pile method, and Figure 9 is a diagram showing the installation status of landslide prevention steel pipe piles. 1... Trailing steel pipe pile, 1a... Pipe end, 2... Bevel, 3... Leading steel pipe pile, 3a... Pipe end, 4a-4
c... Reprint, 5... Cylindrical sleeve metal fitting, 6...
Joint portion, 7a, 7b...Round bar, 8...Gap, 9...
...Steep slope, 10...Scaffolding for boring, 11...
... Vertical hole, 12a-12c ... Steel pipe pile, 13 ... Welding machine, 14 ... Male joint, 15 ... Leading steel pipe pile, 1
6... Female joint, 17... Trailing steel pipe pile, 18... Bevel, 19... Weld metal, 20... Gripping device, 21
...Bracket fitting, 22...Cylindrical sleeve fitting, 23
... Fall prevention band, 24 ... Outer contact surface, 25
a, 25b...Gap holding piece, 26...Through hole.

Claims (1)

[Claims] 1. Connect the leading steel pipe pile and the trailing steel pipe pile in an upright position, and then loosely fit an inner cylindrical sleeve fitting having a bore larger in diameter than the outer diameter of the leading and trailing steel pipe piles to the joint part of the steel pipe pile. A joint pile method for a steel pipe pile in which an adhesive solidifying material is then filled between the outer surface of the steel pipe pile and the inner surface of the cylindrical sleeve fitting, the pipe end being grooved in advance on the outer abutting surface of the joint pile. A method for joining a steel pipe pile, characterized in that the joint is formed into a stamped joint with the same outer diameter, and after the joint is fitted, the outer contact surface is welded all around or partially.