CN117500978A - Joint pipe and method for manufacturing same, design method, steel pipe with joint pipe and method for manufacturing same, design method, steel pipe pile, and method for constructing steel pipe pile - Google Patents
Joint pipe and method for manufacturing same, design method, steel pipe with joint pipe and method for manufacturing same, design method, steel pipe pile, and method for constructing steel pipe pile Download PDFInfo
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- CN117500978A CN117500978A CN202280043170.0A CN202280043170A CN117500978A CN 117500978 A CN117500978 A CN 117500978A CN 202280043170 A CN202280043170 A CN 202280043170A CN 117500978 A CN117500978 A CN 117500978A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 329
- 239000010959 steel Substances 0.000 title claims abstract description 329
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 10
- 238000005520 cutting process Methods 0.000 description 13
- 238000003466 welding Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The present invention aims to provide a joint pipe which can save labor and time for correcting an end portion when being mounted on a steel pipe, and can be applied to a small-diameter steel pipe pile, a manufacturing method thereof, a design method thereof, a steel pipe with a joint pipe, a manufacturing method thereof, a design method thereof, a steel pipe pile, and a construction method of a steel pipe pile, wherein the joint pipe 1 is a threaded or inserted joint pipe which is mounted on an end portion of the steel pipe 3 and is joined to the steel pipe 3, an outer diameter of a base end portion 1a which is joined to the steel pipe 3 is larger than an outer diameter of the steel pipe 3, an inner diameter of the base end portion 1a is smaller than an inner diameter of the steel pipe 3, and an extension amount of the base end portion 1a from an outer circumferential surface of the steel pipe 3 is 9mm or less in a state in which a pipe axis is aligned with the steel pipe 3.
Description
Technical Field
The present invention relates to a joint pipe for joining steel pipes, and more particularly, to a threaded or insert joint pipe for a small-diameter steel pipe pile, a method for manufacturing the same, a method for designing the same, a steel pipe with a joint pipe, a method for manufacturing the same, a method for designing the same, a steel pipe pile, and a method for constructing a steel pipe pile.
Background
Steel pipe piles are limited in length due to manufacturing or transportation, and it is necessary to join a plurality of steel pipe piles at a construction site. In the joining of steel pipes, welding has been conventionally used, but in recent years, mechanical joints have been used in many cases from the viewpoints of shortening the construction time and improving quality control. In particular, in a steel pipe pile having a small diameter (for example, 406.4mm or less), equipment for welding may be omitted, and various mechanical joints may be developed and used.
As a type of mechanical joint, there are, for example, a screw type mechanical joint disclosed in patent document 1 and a mechanical joint coupled by inserting a shear key disclosed in patent document 2. Such a mechanical joint is constituted by a pair of joint pipes. The joint pipe is often manufactured by cutting a short-sized steel pipe separately from a steel pipe serving as a pile body, and is welded and attached to the steel pipe of the pile body in advance at a factory. As described in patent documents 1 and 2, the outer diameter of the joint pipe is generally the same as the diameter of the pile body. This is because the joint portion protrudes outward from the pile, and there is a concern that workability is reduced, and that circumferential friction force exerted when the joint portion is used as a steel pipe pile is reduced. For the same reason, for example, in the field of road bridge foundations, the range that does not affect the friction of the peripheral surface is limited to 9mm or less.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 10-311028
Patent document 2: japanese patent laid-open No. 2009-138382
Disclosure of Invention
Problems to be solved by the invention
As described above, the joint pipe used for the mechanical joint is manufactured separately from the steel pipe of the pile body, and then is attached to the steel pipe by an attachment method such as welding. In this case, in particular, in the case of a thin-walled structure such as a small-diameter steel pipe pile, the roundness of the end portion tends to deteriorate, and misalignment may occur when the joint pipe and the steel pipe are butted. The misalignment herein refers to a radial misalignment occurring between the outer surface shape of the joint pipe end and the outer surface shape of the steel pipe end, or a radial misalignment occurring between the inner surface shape of the joint pipe end and the inner surface shape of the steel pipe end, in the state where the joint pipe and the steel pipe are butted. If there is misalignment, the joint end surfaces of the joint pipe and the steel pipe become uneven in the circumferential direction. Namely, the following state is established: the joint pipe is formed with a level difference protruding outward at a certain portion in the circumferential direction, and the steel pipe is formed with a level difference protruding outward at another portion. If such uneven level differences occur at the joint end surfaces, there is a possibility that the stress transmission is uneven in the circumferential direction when the steel pipe is used as a steel pipe with a joint pipe. Therefore, the end portions need to be corrected (misalignment correction) before the joint pipe and the steel pipe are welded, and labor and time are required.
The present invention has been made in view of the above-described problems, and an object thereof is to provide a joint pipe capable of omitting end correction at the time of installation on a steel pipe, a method of manufacturing the joint pipe, a method of designing the joint pipe, a steel pipe with the joint pipe, a method of manufacturing the steel pipe with the joint pipe, a method of designing the steel pipe with the joint pipe, a steel pipe pile, and a method of constructing the steel pipe pile.
Means for solving the problems
In one embodiment of the present invention, the joint pipe is a threaded joint pipe which is attached to an end portion of a steel pipe and engages the steel pipe, an outer diameter of a base end portion which engages the steel pipe is larger than an outer diameter of the steel pipe, an inner diameter of the base end portion is smaller than an inner diameter of the steel pipe, and an extension amount of the base end portion from an outer peripheral surface of the steel pipe in a state where a pipe axis is aligned with the steel pipe is 9mm or less.
A method for manufacturing a joint pipe according to an aspect of the present invention is a method for manufacturing the joint pipe according to the present invention, wherein a steel pipe to which the joint pipe is attached is selected, a seamless steel pipe having an outer diameter larger than a standard size of the selected steel pipe and an inner diameter smaller than the selected standard size of the steel pipe is selected from among specifications, and a joint fitting portion is formed in a portion other than the base end portion of the selected seamless steel pipe as a material of the joint pipe.
A joint pipe designing method according to an aspect of the present invention is the joint pipe designing method according to the above invention, wherein a steel pipe to which the joint pipe is attached is selected, a seamless steel pipe having an outer diameter larger than the selected steel pipe and an inner diameter smaller than the selected steel pipe is selected from among specifications, and the selected seamless steel pipe is used as a material of the joint pipe.
The steel pipe with a joint pipe according to an aspect of the present invention includes the joint pipe according to the present invention at one or both ends of the steel pipe.
A method for manufacturing a steel pipe with a joint pipe according to an aspect of the present invention includes a step of attaching the joint pipe of the present invention to one or both ends of the steel pipe.
A method of designing a steel pipe with a joint pipe according to an aspect of the present invention is a method of designing a steel pipe with a joint pipe according to the present invention, wherein a steel pipe to which the joint pipe is attached is selected, a seamless steel pipe having an outer diameter larger than the selected steel pipe and an inner diameter smaller than the selected steel pipe is selected from among specifications, and the joint pipe using the selected seamless steel pipe as a raw material is provided at one or both ends of the steel pipe.
A steel pipe pile according to an aspect of the present invention includes the joint pipe of the present invention and a plurality of steel pipes joined by the joint pipe.
A construction method of a steel pipe pile according to an aspect of the present invention is a construction method of constructing the steel pipe pile according to the present invention, wherein a steel pipe having the joint pipe attached to an end thereof is erected in the ground, and another steel pipe having the joint pipe attached to an end thereof is placed on the steel pipe, and the joint pipes are joined to each other.
ADVANTAGEOUS EFFECTS OF INVENTION
In the present invention, the outer diameter of the base end portion joined to the steel pipe is larger than the outer diameter of the steel pipe, and the inner diameter of the base end portion is smaller than the inner diameter of the steel pipe, whereby the steel pipe and the base end portion can be joined so that the base end portion protrudes to the inside and outside of the steel pipe over the entire circumference of the joint end surface of the steel pipe and the base end portion, and uneven layer difference in the circumferential direction does not occur. Therefore, when the steel pipe is used as a steel pipe with a joint pipe, uneven stress is not transmitted in the circumferential direction, and the end correction at the time of installation on the steel pipe can be omitted. In addition, since the base end portion protrudes from the outer peripheral surface of the steel pipe by 9mm or less in a state where the pipe shaft is aligned with the steel pipe, friction on the peripheral surface of the pile is not affected.
Drawings
Fig. 1 is an explanatory view illustrating a joint pipe according to an embodiment of the present invention, and is a sectional view illustrating a state in which a joint pipe (an inner joint pipe) is attached to a steel pipe.
Fig. 2 is a view showing a fitting state of joint pipes (inner joint pipe and outer joint pipe) according to an embodiment of the present invention.
Detailed Description
A joint pipe according to an embodiment of the present invention will be described with reference to fig. 1, taking an inner joint pipe used for a threaded mechanical joint as an example. Fig. 1 is a cross-sectional view of a joint pipe 1 (inner joint pipe) and a steel pipe 3 (joint pipe-equipped steel pipe 4) in a state of being attached to a pipe axis. As shown in fig. 1, the joint pipe 1 of the present embodiment is attached to an end portion of a steel pipe 3 constituting a pile body of a steel pipe pile, and joins the steel pipe 3, and is characterized in that an outer diameter of a base end portion 1a joined to the steel pipe 3 is larger than an outer diameter of the steel pipe 3, and an inner diameter of the base end portion 1a is smaller than an inner diameter of the steel pipe 3. In the drawing, 7 is a backing plate, and 9 is a weld bead.
When the joint pipe 1 and the steel pipe 3 are butted together, the base end portion 1a of the joint pipe 1 is protruded to the inside and outside of the steel pipe 3 in the entire circumferential direction by making the outer diameter of the base end portion 1a larger than the outer diameter of the steel pipe 3 and making the inner diameter of the base end portion 1a smaller than the inner diameter of the steel pipe 3. Thus, the joint pipe 1 and the steel pipe 3 are not unevenly layered in the circumferential direction, and the stress can be transmitted substantially uniformly in the circumferential direction when the joint pipe-equipped steel pipe 4 (joint pipe 1-equipped steel pipe 3) is used. Therefore, the joint pipe 1 can be attached to the steel pipe 3 without correcting the ends of the joint pipe 1 and the steel pipe 3, and labor and time can be saved.
Further, as described above, when the protrusion amount of the joint exceeds 9mm, there is a possibility that the circumferential friction force is reduced. In this regard, as shown in fig. 1, the joint pipe 1 of the present embodiment is configured such that the protrusion a of the base end portion 1a (see an enlarged view of a portion surrounded by a broken line circle in the figure) outward from the outer periphery of the steel pipe 3 is 9mm or less in a state where the pipe axis (see a one-dot chain line in the figure) is aligned with the steel pipe 3.
The inner joint pipe used for the threaded mechanical joint is described as the joint pipe 1, but the outer joint pipe is also the same. Fig. 2 is a cross-sectional view showing a state in which the joint pipe 1 as an inner joint pipe and the joint pipe 5 as an outer joint pipe are fitted to each other. As shown in fig. 2, in the joint pipe 5, the outer diameter of the base end portion 5a is made larger than the outer diameter of the steel pipe 3, and the inner diameter of the base end portion 5a is made smaller than the inner diameter of the steel pipe 3, so that the base end portion 5a extends out of the steel pipe 3 in the entire circumferential direction in a state where the joint pipe 5 and the pipe shaft of the steel pipe 3 are mounted in alignment (the steel pipe 11 with the joint pipe). As a result, as in the joint pipe 1 (inner joint pipe), uneven layer is not generated in the circumferential direction at the joint portion between the joint pipe 5 and the steel pipe 3, and when the steel pipe 11 with joint pipe (steel pipe 3 with joint pipe 5) is used, stress can be transmitted substantially uniformly in the circumferential direction. In addition, if the amount of extension of the base end portion 5a of the joint pipe 5 from the outer peripheral surface of the steel pipe 3 is 9mm or less as in the joint pipe 1, the supporting force at the time of use of the steel pipe with joint pipe 11 is not reduced.
Fig. 1 and 2 show only one end of the steel pipe with joint 4 and the steel pipe with joint 11, but the steel pipe with joint according to the present invention is not limited to a steel pipe having a joint attached only to one end, and includes a steel pipe having a joint attached to both ends. Specifically, the present invention includes a method in which a joint pipe as an inner joint pipe is provided at one or both ends of a steel pipe, a method in which a joint pipe as an outer joint pipe is provided at one or both ends of a steel pipe, a method in which a joint pipe as an inner joint pipe is provided at one end of a steel pipe, and a method in which a joint pipe as an outer joint pipe is provided at the other end of a steel pipe.
Next, a method for manufacturing the joint pipe 1 will be described. The method for manufacturing the joint pipe 1 according to the present embodiment is characterized in that a steel pipe to which the joint pipe 1 is attached is selected, a seamless steel pipe having an outer diameter larger than the standard size of the selected steel pipe 3 and an inner diameter smaller than the standard size is selected from the inside, and the joint fitting portion 1b is formed by forming a screw portion, for example, by cutting, on a portion other than the base end portion 1a, using the selected seamless steel pipe as a material of the joint pipe 1. The following will explain the present invention in detail.
As described above, in the case of the threaded joint pipe, the joint pipe 1 is generally manufactured by cutting a short-sized steel pipe different from the steel pipe 3 of the pile body. Therefore, a steel pipe 3 to which the joint pipe 1 is attached may be selected, and a short-sized steel pipe having an outer diameter larger than the selected standard size (outer diameter and inner diameter) of the steel pipe 3 and having a smaller inner diameter may be used as a material of the joint pipe 1.
Here, if the difference in the outer diameters between the short-sized steel pipe and the steel pipe 3 constituting the pile body is 18mm or less, the protrusion a (see fig. 1) when attached to the joint pipe 1 and the steel pipe 3 is 9mm or less, and therefore the joint pipe 1 can be manufactured by forming the joint fitting portion 1b (threaded portion) only by cutting at a portion other than the base end portion 1 a. When the difference in outer diameter between the short-sized steel pipe and the steel pipe 3 exceeds 18mm, the outer peripheral surface needs to be cut to 18mm or less, and therefore the short-sized steel pipe as a raw material preferably has a slightly larger outer diameter than the steel pipe of the pile body. In this regard, in the present embodiment, by using a seamless steel pipe as a short-sized steel pipe, the joint pipe 1 can be efficiently manufactured. The reason why the joint pipe 1 can be efficiently manufactured by using a seamless steel pipe will be described in detail in a design method described later.
Further, by attaching the joint pipe 1 to one or both ends of the steel pipe 3, the steel pipe 4 with the joint pipe can be manufactured. As a method of attaching the joint pipe 1 to the steel pipe 3, it is general to place the steel pipe 3 laterally on a steering roller and attach the joint pipe 1 to an end portion thereof by welding. In the construction of a steel pipe pile, it is important that the pipe axis of the joint pipe 1 coincides with the pipe axis of the steel pipe 3, and therefore, the joint pipe 1 and the steel pipe 3 are welded with attention. Since the outer diameters of the joint pipe 1 and the steel pipe 3 are different, the steering roller is rotated in a state where the joint pipe 1 is temporarily attached to the steel pipe 3, and it is sufficient to confirm whether or not the pipe axes of the joint pipe 1 and the steel pipe 3 coincide.
As described above, after the pipe axes of the joint pipe 1 and the steel pipe 3 are aligned, the backing plate 7 is attached to the inner surface side of the steel pipe 3, and main welding is performed by full-circle penetration welding from the outer surface side of the steel pipe 3. As described above, the joint pipe 1 of the present embodiment has a shape that extends outward from the steel pipe 3 in the entire circumferential direction in a state where the pipe axis is aligned with the steel pipe 3, and therefore, the end portion does not need to be corrected, and welding is easy. Depending on the strength required of the joint pipe 1, it may be fillet welded instead of penetration welding.
Next, a method of designing the joint pipe 1 will be described. The method for designing the joint pipe 1 according to the present embodiment is characterized in that a steel pipe 3 to which the joint pipe 1 is attached is selected, a seamless steel pipe having an outer diameter larger than the standard size of the selected steel pipe 3 and an inner diameter smaller than the standard size is selected from the specifications, and the selected seamless steel pipe is used as a material of the joint pipe 1. This will be specifically described below.
As the steel pipe 3 constituting the steel pipe pile body, an electric resistance welded steel pipe, a seamless steel pipe, a coiled steel pipe, or the like is used. Hereinafter, a case will be described in which an electric resistance welded steel pipe is used for the steel pipe 3, since an electric resistance welded steel pipe is generally used for the steel pipe pile. Since the outer diameter and the plate thickness of the electric resistance welded steel pipe are standardized as an industrial product, the electric resistance welded steel pipe constituting the steel pipe 3 is selected from the specifications and dimensions of electric resistance welded steel pipes generally used as steel pipe piles according to the foundation and load conditions of the construction site.
Next, a short-sized steel pipe as a raw material of the joint pipe 1 is selected based on the selected gauge (outer diameter) of the resistance welded steel pipe. At this time, it is necessary to select a steel pipe having a larger outer diameter than the steel pipe 3, but if a steel pipe having a size larger by one is selected within the same specification of the electric resistance welded steel pipe as the steel pipe 3, the outer diameter is greatly increased. Since the joint pipe 1 of the present embodiment needs to have the above-described projecting amount a (see fig. 1) of 9mm or less, if a steel pipe having an outer diameter significantly larger than that of the steel pipe 3 is used as a material of the joint pipe 1, the cutting amount increases, and the cost is increased.
Therefore, in the present embodiment, a seamless steel pipe is used as a material of the joint pipe 1. The seamless steel pipe is also standardized as an industrial product, but the specification of the seamless steel pipe corresponds to various sizes, and a product having a slightly larger outer diameter than the specification of the electric resistance welded steel pipe, which is a size suitable for the joint pipe 1 of the present embodiment, is also included in the specification. Table 1 shows the specifications of the outer diameters of the electric resistance welded steel pipes used for the steel pipes 3, and seamless steel pipes suitable as the joint pipes 1 to be attached thereto were selected from among the specifications.
TABLE 1
(Table 1)
For example, in the case where the steel pipe 3 is a resistance welded steel pipe having an outer diameter of 165.2mm, if the joint pipe 1 to be attached thereto is also a resistance welded steel pipe, a resistance welded steel pipe having an outer diameter of 190.7mm, which is one-size larger, is used. If the joint pipe 1 having an outer diameter of 190.7mm is attached to the steel pipe 3 having an outer diameter of 165.2mm, the protrusion a exceeds 9mm, and therefore, it is necessary to perform cutting work for reducing the outer diameter of the resistance welded steel pipe, which increases the processing cost.
On the other hand, if the joint pipe 1 is a seamless steel pipe, a seamless steel pipe having an outer diameter of 168.3mm can be used. In the case of a seamless steel pipe having an outer diameter of 168.3mm, the joint pipe 1 having an extension a of 9mm or less can be produced by simply cutting the joint fitting portion 1b without cutting the outer diameter.
In addition, in the case where the steel pipe 3 is an electric resistance welded steel pipe having an outer diameter of 406.4mm, a seamless steel pipe having an outer diameter of 426.0mm is used. Therefore, in order to reduce the protrusion a to 9mm or less, it is necessary to cut the seamless steel pipe to reduce the outer diameter, but the cutting is easy because the cutting is about 1mm.
Table 1 shows the standard diameter, and the outer diameter, inner diameter, and wall thickness of the end portion of the steel pipe actually manufactured are changed in the circumferential direction or are elliptically formed, so that a portion larger than the standard diameter and a portion smaller than the standard diameter are generated. Since the difference in diameter between the seamless steel pipe and the electric resistance welded steel pipe is small, the case where the diameters of the electric resistance welded steel pipe and the seamless steel pipe deviate from the reference diameter has also been studied.
In the specification of a steel pipe pile, the roundness defined by the following formula (1) is defined to be 1.0% or less.
Roundness= (maximum diameter-minimum diameter)/standard diameter×100 (1)
The maximum diameter and the minimum diameter in the formula (1) are diameters of welded portions of the steel pipes.
For example, in the case where the true circularities of the steel pipe 3 (resistance welded steel pipe) and the joint pipe 1 (seamless steel pipe) are 1%, respectively, when the maximum diameter portion of the steel pipe 3 is butted against the minimum diameter portion of the joint pipe 1, the steel pipe 3 protrudes further to the outside than the joint pipe 1 at that portion. This can be prevented by aligning the directions of the maximum diameters of the respective members before welding. Therefore, it is sufficient to consider the case where a portion of +0.5% of the reference diameter of the steel pipe 3 is butted with a portion of-0.5% of the reference diameter of the joint pipe 1. The results are shown in Table 2.
TABLE 2
TABLE 2
As shown in table 2, when comparing the value of 1.005 times (+0.5%) the reference diameter of the resistance welded steel pipe shown in table 1 with the value of 0.995 times (-0.5%) the reference diameter of the seamless steel pipe, the outer diameter of the seamless steel pipe was larger than the outer diameter of the resistance welded steel pipe in any case. As described above, in the case of using a seamless steel pipe as a material of the joint pipe 1, even if deformation occurs in the resistance welded steel pipe (steel pipe 3) or the seamless steel pipe (joint pipe 1), it is considered that there is no obstacle to welding the joint pipe 1 and the steel pipe 3 as long as the deformation is allowable in the specification.
Further, since the thickness of the seamless steel pipe can be freely set, it is easy to form an inner diameter smaller than that of the steel pipe 3 (resistance welded steel pipe). This will be described with reference to table 3.
TABLE 3
(Table 3)
Table 3 shows the general plate thickness when the steel pipe pile (steel pipe 3) uses the electric resistance welded steel pipes having the respective outer diameters shown in table 1 and the range of the produced plate thickness of the seamless steel pipes having the respective outer diameters shown in table 1. For example, in Table 2, the inner diameter of a resistance welded steel pipe having an outer diameter of 165.2mm and a plate thickness of 5.6mm was 154mm, and the inner diameter of a resistance welded steel pipe having an outer diameter of 165.2mm and a plate thickness of 7.1mm was 151mm. In contrast, the thickness range of the seamless steel pipe having an outer diameter of 168.3mm is 4.0mm to 40 mm. Accordingly, the thickness of the sheet is set within the range of the thickness of the sheet to be manufactured, and the inner diameter is set to be smaller than 154mm or 151mm.
Further, the joint pipe 1 is provided at one or both ends of the steel pipe 3, whereby the steel pipe 4 with the joint pipe can be designed. Specifically, the steel pipe 3 to which the joint pipe 1 is attached is selected, a seamless steel pipe having an outer diameter larger than the standard size of the selected steel pipe 3 and an inner diameter smaller than the standard size of the selected steel pipe 3 is selected from the standard, and the joint pipe 1 using the selected seamless steel pipe as a raw material is provided at one or both ends of the steel pipe 3, whereby the steel pipe 4 with the joint pipe of the present embodiment can be designed.
The above-described method for manufacturing and designing a joint pipe and method for manufacturing and designing a steel pipe with a joint pipe are described by taking the joint pipe 1 as an inner joint pipe and the steel pipe 4 with a joint pipe having the joint pipe 1 as examples, but the same applies to the case of the joint pipe 5 as an outer joint pipe and the steel pipe 11 with a joint pipe having the joint pipe 5.
As described above, the outer diameter of the base end portion 1a of the joint pipe 1 of the present embodiment is larger than the outer diameter of the steel pipe 3, and the inner diameter of the base end portion 1a is smaller than the inner diameter of the steel pipe 3, so that the labor and time for correcting the ends of the joint pipe 1 and the steel pipe 3 can be saved when the joint pipe is attached to the steel pipe 3. In addition, since the amount of protrusion from the outer circumferential surface of the steel pipe 3 is 9mm or less in a state where the pipe axis is aligned with the steel pipe 3, a predetermined supporting force can be exerted even when applied to a steel pipe pile. In particular, when the joint pipe 1 of the steel pipe with joint pipe 4 and the joint pipe 5 of the steel pipe with joint pipe 11 are joined to form a steel pipe pile, the protrusion amounts are all 9mm or less, so that a predetermined supporting force can be reliably exerted, which is more preferable. In particular, when the present invention is applied to a steel pipe pile having an outer diameter of 406.4mm or less, which is generally referred to as a "small diameter", the labor and time for production are greatly reduced, and therefore the production cost can be reduced. Further, the steel pipe pile having an outer diameter of 406.4mm or less is more likely to be rotationally penetrated into the pile, and therefore the present invention is more preferred because it has less influence on friction on the circumferential surface of the pile. Further, by using a seamless steel pipe as the material of the joint pipe 1, the amount of cutting at the time of cutting the material can be minimized, and thus the manufacturing cost can be reduced.
In the above-described embodiment, the threaded joint pipes in which the joint pipes are fitted to each other by the threads formed in the joint fitting portion have been described as an example, but the joint pipe, the manufacturing method, and the design method of the present invention are not limited to this. For example, the inner joint pipe may be inserted into the outer joint pipe, and the convex portion formed on the outer peripheral surface of the inner joint pipe may be engaged with the concave portion formed on the inner peripheral surface of the outer joint pipe, thereby fitting the joint pipes to each other.
In the above embodiment, the joint fitting portions 1b and 5b of the joint pipes 1 and 5 are formed by cutting, but the present invention is not limited thereto. The adaptor fitting portions 1b, 5b may be formed using other known or unknown techniques, and in this case, the effect of the present invention can be obtained. However, the joint pipe of the present invention is not limited to the above-described method in which the joint fitting is subsequently processed on the steel pipe as the raw material, and the joint fitting may be manufactured at the same time using, for example, casting or a 3D printer.
In the above-described method for producing a steel pipe with a joint pipe, an example in which the joint pipes 1 and 5 are attached to the end portions of the steel pipe 3 by welding has been described, but the present invention is not limited thereto. As long as the joint pipes 1 and 5 can be reliably joined to the steel pipe 3 in a state where the pipe axes are aligned with the steel pipe 3, various loads applied during construction or during use can be received, supporting force as a steel pipe pile can be exerted, and other installation methods may be employed.
In the above embodiment, the joint pipe and the steel pipe with the joint pipe attached thereto have been described, but a steel pipe pile may be formed by connecting joint pipes of a plurality of steel pipes with joint pipes to each other at a construction site or the like. That is, the steel pipe pile includes the joint pipe described in the above embodiment and a plurality of steel pipes joined by the joint pipe.
In the construction of the steel pipe pile, it is possible to join joint pipes to each other by disposing another steel pipe (another joint pipe-attached steel pipe) having a joint pipe attached to an end portion thereof on a steel pipe (joint pipe-attached steel pipe) in a state where the steel pipe having a joint pipe attached to an end portion thereof is erected in the ground.
Industrial applicability
The present invention is applicable to a joint pipe used for joining steel pipes, and is particularly applicable to a threaded or plug-in joint pipe used for a small-diameter steel pipe pile.
Description of the reference numerals
1 joint pipe (inner joint pipe)
1a base end portion
1b fitting portion
3 steel pipe
4 steel pipe with joint pipe
5 joint pipe (outside joint pipe)
5a base end portion
5b connector fitting portion
7 backing plate
9 weld beads
11 steel pipe with joint pipe.
Claims (8)
1. A joint pipe which is a threaded or insert joint pipe attached to an end of a steel pipe and joined to the steel pipe,
the outer diameter of the base end portion joined to the steel pipe is larger than the outer diameter of the steel pipe,
the inner diameter of the base end portion is smaller than the inner diameter of the steel pipe,
in a state where the pipe shaft is aligned with the steel pipe, the amount of extension of the base end portion from the outer peripheral surface of the steel pipe is 9mm or less.
2. A method for producing a joint pipe according to claim 1, wherein,
selecting a steel pipe for installing the joint pipe,
a seamless steel pipe having an outer diameter larger than the selected steel pipe specification and an inner diameter smaller than the selected steel pipe specification is selected from the specification,
and forming a joint fitting portion in a portion other than the base end portion using the selected seamless steel pipe as a material of the joint pipe.
3. A method for designing a joint pipe according to claim 1, wherein,
selecting a steel pipe for installing the joint pipe,
a seamless steel pipe having an outer diameter larger than the selected steel pipe specification and an inner diameter smaller than the selected steel pipe specification is selected from the specification,
and taking the selected seamless steel pipe as a raw material of the joint pipe.
4. A steel pipe with a joint pipe, comprising the joint pipe according to claim 1 at one or both ends of the steel pipe.
5. A method for producing a steel pipe with a joint pipe, comprising the step of attaching the joint pipe according to claim 1 to one or both ends of the steel pipe.
6. A method for designing a steel pipe with a joint pipe according to claim 4, wherein the method is performed in such a manner that,
selecting a steel pipe for installing the joint pipe,
a seamless steel pipe having an outer diameter larger than the selected steel pipe specification and an inner diameter smaller than the selected steel pipe specification is selected from the specification,
the joint pipe using the selected seamless steel pipe as a raw material is provided at one or both ends of the steel pipe.
7. A steel pipe pile comprising the joint pipe according to claim 1 and a plurality of steel pipes joined by the joint pipe.
8. A method of constructing a steel pipe pile according to claim 7,
in a state where the steel pipe with the joint pipe attached at an end is erected in the ground, another steel pipe with the joint pipe attached at an end is disposed on the steel pipe, and the joint pipes are joined to each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021104520A JP7160150B1 (en) | 2021-06-24 | 2021-06-24 | Joint pipe, manufacturing method thereof, design method thereof, steel pipe with joint pipe, manufacturing method thereof, design method thereof, steel pipe pile and construction method of steel pipe pile |
| JP2021-104520 | 2021-06-24 | ||
| PCT/JP2022/022434 WO2022270262A1 (en) | 2021-06-24 | 2022-06-02 | Joint pipe and methods of manufacturing and designing same, steel pipe with joint pipe and methods of manufacturing and designing same, steel pipe pile, and method of constructing steel pipe pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117500978A true CN117500978A (en) | 2024-02-02 |
Family
ID=83742512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280043170.0A Pending CN117500978A (en) | 2021-06-24 | 2022-06-02 | Joint pipe and method for manufacturing same, design method, steel pipe with joint pipe and method for manufacturing same, design method, steel pipe pile, and method for constructing steel pipe pile |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7160150B1 (en) |
| KR (1) | KR20240004686A (en) |
| CN (1) | CN117500978A (en) |
| TW (1) | TWI809936B (en) |
| WO (1) | WO2022270262A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3747594B2 (en) | 1996-10-22 | 2006-02-22 | Ｊｆｅスチール株式会社 | Steel pipe pile joints |
| JP4767659B2 (en) | 2004-11-08 | 2011-09-07 | Ｊｆｅスチール株式会社 | How to connect steel pipes |
| JP2009024436A (en) | 2007-07-23 | 2009-02-05 | Chiyoda Koei Kk | Mechanical joint of steel pipe pile |
| JP5021437B2 (en) | 2007-12-05 | 2012-09-05 | Ｊｆｅスチール株式会社 | Steel pipe pile connection structure |
| JP2009299298A (en) | 2008-06-11 | 2009-12-24 | Chiyoda Geotech Co Ltd | Mechanical joint of steel pipe pile |
| CN211547696U (en) * | 2019-12-17 | 2020-09-22 | 中交路桥建设有限公司 | Steel pipe pile |
-
2021
- 2021-06-24 JP JP2021104520A patent/JP7160150B1/en active Active
-
2022
- 2022-06-02 WO PCT/JP2022/022434 patent/WO2022270262A1/en active Application Filing
- 2022-06-02 KR KR1020237040962A patent/KR20240004686A/en unknown
- 2022-06-02 CN CN202280043170.0A patent/CN117500978A/en active Pending
- 2022-06-17 TW TW111122623A patent/TWI809936B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022270262A1 (en) | 2022-12-29 |
| KR20240004686A (en) | 2024-01-11 |
| JP2023003436A (en) | 2023-01-17 |
| TW202302961A (en) | 2023-01-16 |
| TWI809936B (en) | 2023-07-21 |
| JP7160150B1 (en) | 2022-10-25 |
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