JP6410595B2 - Connecting member, connecting member unit, and connecting method - Google Patents

Description

  The present invention relates to a connecting member and a connecting method for connecting a plurality of steel pipes arranged in the vertical direction.

  Steel pipe piles are used for the basic structures such as bridges, harbor structures and building structures. In the construction of steel pipe piles, for the reasons of production and transportation, steel pipes of several meters to several tens of meters manufactured at the factory are carried to the site, and are longitudinally spliced at the site, with the hard ground under the soft ground. A predetermined length reaching a certain support layer is formed.

  In this longitudinal connection work, the upper steel pipe was suspended from the lower steel pipe with a crane and the butted ends were connected by welding. It is necessary to weld the steel pipes while maintaining the inclination of both steel pipes, and the quality of the welded part depends not only on the weather, but also use fittings such as a backing ring accompanying welding. It was tedious and costly.

  Therefore, Patent Document 1 describes an upper steel pipe and a lower steel pipe as an alternative to welding longitudinal welding in order to improve the efficiency of steel pipe longitudinal joining work at the construction site from the viewpoint of labor saving and shortening the construction period. A joint having a mechanical joint structure to be connected has been proposed.

  The joint structure includes a female box joint welded to the lower end portion of the upper steel pipe and a male pin joint welded to the upper end portion of the lower steel pipe. The structure is such that the load transmission key built in is extruded and fixed into the groove on the pin joint side using bolts.

  By the way, the steel pipe needs to be driven along the vertical direction as a whole. However, a slight inclination may occur in the steel pipe to be driven vertically during the construction. For example, when the diameter of the steel pipe is 1000 mm, one end of the end face of the steel pipe and the other end opposed to the end face are inclined in the height direction within a range of several mm, for example, about 1 mm or more and about 3 mm or less. Is inclined in the range of about 0.05 degree to about 0.20 degree from the vertical direction. Although this inclination is seemingly small, if the entire length of the steel pipe is several tens of meters, it appears as a large horizontal deviation from the bottom steel pipe to the top steel pipe.

  In the longitudinal connection of upper and lower steel pipes by conventional welding, even when the lower steel pipe is driven, the upper steel pipe is welded while correcting the tilt of the axial center, so that the steel pipe is The verticality of the shaft center as a whole of the pipes connected in the vertical direction was secured.

  However, in the joint structure, when two steel pipes that need to be arranged in the vertical direction along the vertical direction are connected, the axis of the lower steel pipe arranged below is somewhat slightly from the vertical direction. When tilted and driven, the tilt cannot be corrected as in the case of a longitudinal joint by welding, so that the axis of the upper steel pipe that is cascaded on the lower steel pipe whose axis is inclined is similarly inclined. there were.

  Moreover, in the steel pipe sheet pile well foundation formed by combining a plurality of steel pipes in a closed shape, high accuracy is required for the verticality of the first and last steel pipe sheet piles. Even in such a case, the inclination of the axis of the steel pipe has been a problem.

JP 2000-319874 A

  The problem of the present invention is that when connecting two steel pipes that need to be arranged vertically along the vertical direction, the axis of the lower steel pipe arranged below is slightly inclined from the vertical direction. However, it is providing the connection member and the connection method which can correct the axial center of the upper steel pipe arrange | positioned upward in the direction along the perpendicular direction.

  A first characteristic configuration of the connecting member according to the present invention is a connecting member for connecting a plurality of steel pipes in the vertical direction, and includes an upper end portion of a lower steel pipe disposed below, and the lower steel pipe. A first joint portion that can be joined along a first joint axis that coincides with the shaft center, a lower end portion of the upper steel pipe disposed above, and a second joint that coincides with the shaft center of the upper steel pipe A second joining portion that can be joined along a joint axis, wherein the first joining portion and the second joining portion are such that the second joining axis is the first joining shaft center. And having a predetermined inclination angle.

  When connecting two steel pipes that need to be arranged in the vertical direction along the vertical direction, when the axis of the lower steel pipe arranged below is slightly inclined from the vertical direction, the present invention It can connect, correcting the axial center of an upper steel pipe in the direction along a perpendicular direction via the connection member by. Note that the connecting member may be formed by connecting the first joining portion and the second joining portion separately by welding or the like, or may be formed integrally by machining or casting. Good.

  The second characteristic configuration of the connecting member according to the present invention is that the first joining portion is joined to the first joining portion between the first joining portion and a key groove provided around the upper end portion of the lower steel pipe. A key groove capable of straddling a rotation inhibiting key for inhibiting relative rotation around the axis of the lower steel pipe is provided, and the number of key grooves provided around the first joint portion is The number of key grooves provided around the upper end of the lower steel pipe is greater than the number of key grooves.

  The connection position in the circumferential direction between the lower steel pipe and the connection member is defined in advance by the position of the key groove on which the rotation suppression key is straddled. According to the above-described configuration, the axis of the upper steel pipe disposed on the upper side of the number of key grooves provided on the connecting member in accordance with the inclination direction of the axis of the lower steel pipe disposed below. Can be provided between the key groove that can be disposed so as to extend most vertically and the key groove that is provided around the lower steel pipe.

  The characteristic configuration of the connecting member unit according to the present invention is a connecting member unit including a plurality of connecting members having at least one of the above-described characteristic configurations, wherein the plurality of connecting members have different inclination angles. is there.

  According to the above-described configuration, the upper center of the upper steel pipe disposed at the uppermost position is connected to the lowermost steel pipe using the connecting member having an appropriate inclination angle according to the inclination direction of the lower steel pipe disposed at the lower side. It can be arranged along the vertical.

  A first characteristic configuration of the connection method according to the present invention is a connection method for connecting a plurality of steel pipes in the vertical direction using the connection member having the first or second characteristic configuration described above, and is arranged below. A lower joining step for joining an upper end portion of a lower steel pipe to be provided and a first joining portion provided in the connecting member; and a second joining provided in the connecting member after the lower joining step. An upper joining step for joining the joint portion and the lower end portion of the upper steel pipe disposed above, and the lower joining step includes an upper end portion of the lower steel pipe and the first joining portion. In the point provided with the adjustment step which adjusts the position of the above-mentioned connecting member so that the 2nd joint axis of the 2nd joint part with which the above-mentioned connecting member is equipped is most along a perpendicular direction.

  The 2nd characteristic structure of the connection method which concerns on this invention is a connection method which connects a some steel pipe to an up-down direction using the connection member provided with the 2nd characteristic structure mentioned above, Comprising: It arrange | positions below. The lower joining step for joining the upper end portion of the lower steel pipe and the first joining portion included in the connecting member is the lower side of the key grooves provided around the first joining portion. When the upper end portion of the steel pipe and the first joining portion are joined, the key groove such that the second joining axis of the second joining portion provided in the connecting member is most along the vertical direction, The positioning step includes a positioning step that faces a key groove provided around the upper end of the side steel pipe, and a key straddling step that straddles a rotation suppression key between the key grooves.

  The 3rd characteristic structure of the connection method which concerns on this invention is a connection method which connects a some steel pipe to an up-down direction using the connection member unit which has the characteristic structure mentioned above, Comprising: The lower steel pipe arrange | positioned below Depending on the inclination of the shaft center from the vertical direction, when two steel pipes are connected vertically from among a plurality of connecting members, the axis of the upper steel pipe disposed above is most vertically aligned. The selection step of selecting a connecting member having an inclination angle of the second connecting axis with respect to the first connecting axis, and the lower steel pipe and the upper steel pipe using the connecting member selected in the selecting step. And a connecting step for connecting the two.

Explanatory drawing of the connection member which concerns on this invention, and the upper steel pipe and lower steel pipe connected by it. Detailed drawing of the joining structure of a connection member. The front view of the connection member shown in FIG. Explanatory drawing of the connection method using the connection member which concerns on this invention. Explanatory drawing of the connection member unit which concerns on this invention.

  Embodiments of the present invention will be described with reference to the drawings. In each figure, the same code | symbol is attached | subjected to the same structure.

  FIG. 1 shows a connecting member 20 according to the first aspect of the present invention and two steel pipes 10 connected by the connecting member 20. Of the two steel pipes 10, a steel pipe disposed relatively downward is referred to as a lower steel pipe 10 </ b> A, and a steel pipe disposed relatively upward is referred to as an upper steel pipe 10 </ b> B. It is a configuration.

  A joint structure between the lower steel pipe 10A and the upper steel pipe 10B will be described. A male pin joint 11 is attached to the upper end of the lower steel pipe 10A by welding, a female box joint 12 is attached to the lower end of the upper steel pipe 10B by welding, and a box joint 12 is attached to the lower end of the lower steel pipe 10A. The same box joint 12 (not shown) is attached by welding, and a pin joint 11 (not shown) similar to the pin joint 11 is attached to the upper end of the upper steel pipe 10B by welding.

As shown in FIGS. 1 and 2, the pin joint 11 has an insertion portion 11B having a smaller diameter than the cylindrical portion 11A extending continuously from the cylindrical portion 11A having an outer diameter substantially the same as the outer diameter of the lower steel pipe 10A. It is installed.
At the base end portion of the fitting insertion portion 11B, a concave portion 11C is provided over the entire circumference, to which the convex portion 12C provided over the entire circumference at the lower end portion of the box joint 12 of the upper steel pipe 10B is joined. A convex portion 11D for insertion into a concave portion 12D provided over the entire circumference at the base end portion of the inner periphery of the box joint 12 of the upper steel pipe 10B is provided over the entire upper end portion of the fitting insertion portion 11B. A key groove 11F for fitting the load transmission key 31 is provided on the outer periphery of the insertion portion 11B. Four key grooves 11E are provided on the outer periphery of the cylindrical portion 11A at equal intervals over the entire periphery.

  The box joint 12 includes a cylindrical portion 12A having an outer diameter substantially the same as the outer diameter of the upper steel pipe 10B. The inner periphery of the box joint 12 is a fitted insertion part into which the fitting insertion part 11B of the pin joint 11 of the lower steel pipe 10A is inserted, and the convex part 11D of the fitting insertion part 11B is inserted into this fitted insertion part. A recessed portion 12D is provided. A key groove 12F is formed on the inner periphery of the cylindrical portion 12A, and an arc-shaped load transmission key 31 that is appropriately divided over the entire periphery is disposed in the key groove 12F. Four key grooves 12E are provided on the outer periphery of the cylindrical portion 12A at equal intervals over the entire periphery.

  On the outer periphery of the box joint 12, a plurality of bolt holes 12G communicating with the key groove 12F are perforated at intervals along the circumferential direction. The bolt 12G is screwed with a set bolt 12H made of a hexagonal holed bolt or the like. The set bolt 12H is screwed inward in the radial direction by a tightening operation from the outside of the box joint 12. Is possible.

  By the tightening operation of the set bolt 12H, the load transmission key 31 disposed at the tip of the set bolt 12H is projected from the key groove 12F to the key groove 11F of the pin joint 11 facing radially inward, and the load transmission key 31 is disposed across both the box joint 12 and the pin joint 11. Thus, the box joint 12 and the pin joint 11 are mechanically joined via the load transmission key 31 so that relative movement in the vertical direction is impossible.

  Note that the load transmission key 31 is not limited to a single line, and may be a plurality of two or more lines. The number of load transmission keys 31, and the thickness and width thereof are also appropriately designed according to the strength of vertical joining required for joining the upper steel pipe 10B and the lower steel pipe 10A.

  When the lower steel pipe 10 </ b> A and the upper steel pipe 10 </ b> B are directly joined, the four key grooves 11 </ b> E and the box joint 12 that are provided around the pin joint 11 are joined at the joint portion between the pin joint 11 and the box joint 12. A key arrangement portion is formed by aligning the four key grooves 12E provided in the circumference with each other in the circumferential direction, and the rotation inhibition key 30 is arranged in the key arrangement portion, and the key arrangement portions are joined. That is, the pin joint 11 and the box joint 12, that is, the lower steel pipe 10A and the upper steel pipe 10B are prevented from rotating relatively.

  For example, the rotation suppression key 30 is formed of a flat plate member having a rectangular shape in front view and cross-sectional view. Further, the rotation suppression key 30 is inserted with bolts 32 for fixing the rotation suppression key 30 to the steel pipes 10 (10A, 10B) and the key grooves 11E, 12E of the connecting member 20 and the key grooves 21E, 22E described later. Bolt holes 33 are formed.

  A steel pipe pile is constituted by the lower steel pipe 10A and the upper steel pipe 10B configured as described above. In joining the lower steel pipe 10A and the upper steel pipe 10B, the lower steel pipe 10A is basically driven along the vertical direction, but the axis CA of the lower steel pipe 10A is slightly inclined from the vertical direction. In order to correct the axis CB of the upper steel pipe 10B in the direction along the vertical direction, the connecting member 20 according to the present invention is used.

  As a joint structure between the connecting member 20 and the lower steel pipe 10A or the upper steel pipe 10B, the connecting member 20 is the same as the upper end of the lower steel pipe 10A, that is, the pin joint 11 and the axis CA of the lower steel pipe 10A. A box joint 22 as a first joint portion that can be joined along one joint axis (hereinafter referred to as CA), a lower end portion of the upper steel pipe 10B, that is, a box joint 12, and an upper steel pipe 10B. A pin joint 21 is provided as a second joining portion that can be joined along a second joining axial center (hereinafter referred to as CB) that coincides with the shaft center CB.

  As shown in FIGS. 1 to 3, the pin joint 21 and the box joint 22 of the connecting member 20 are welded at the welded portion 23 to form an angle formed by the second joint axis CB and the first joint axis CA. Is configured to have a predetermined inclination angle θ. Although the inclination angle θ is not particularly limited, since the lower steel pipe 10A is basically driven vertically when the lower steel pipe 10A is driven, for example, the end surface of the steel pipe 10 has a diameter of about 1000 mm. Even if one end and the other end opposed to each other on the end face are inclined in the height direction within a range of several mm, for example, greater than 0 mm and about 5 mm or less, that is, the axis CA is greater than 0.00 degrees from the vertical direction. Even if the inclination is in the range of about 0.30 degrees or less, it is only necessary to correct this inclination, so that θ should be in the range of more than 0.00 and about 0.30 degrees or less. Preferably, it may be in the range of about 0.05 degrees to about 0.20 degrees.

The box joint 22 of the connecting member 20 has basically the same configuration as the box joint 12 of the upper steel pipe 10B.
The box joint 22 includes a cylindrical portion 22A having an outer diameter substantially the same as the outer diameter of the upper steel pipe 10B. The inner periphery of the box joint 22 is a fitted insertion part into which the fitting insertion part 11B of the pin joint 11 of the lower steel pipe 10A is inserted, and the convex part 11D of the fitting insertion part 11B is inserted into this fitted insertion part. A recessed portion 22D (see FIG. 2) is provided. A key groove 22F is formed on the inner periphery of the cylindrical portion 22A, and an arc-shaped load transmission key 31A (31) appropriately divided over the entire periphery is disposed in the key groove 22F. Eight key grooves 22E are provided on the outer periphery of the cylindrical portion 22A at equal intervals over the entire periphery.

  On the outer periphery of the box joint 22, a plurality of bolt holes 22G communicating with the key groove 22F are perforated at intervals along the circumferential direction. The bolt 22 </ b> G is screwed with a set bolt 22 </ b> H composed of a hexagon socket bolt, etc., and the set bolt 22 </ b> H is screwed inward in the radial direction by a tightening operation from the outside of the box joint 22. Is possible.

  When the lower steel pipe 10A and the connecting member 20 are joined, the load transmission key 31A (at the tip of the set bolt 22H) is tightened by the tightening operation of the set bolt 22H disposed at the box joint 22. 31) is projected from the key groove 22F to the key groove 22F of the pin joint 11 facing radially inward, and the load transmission key 31A (31) is disposed across both the box joint 22 and the pin joint 11. Thus, the box joint 22 and the pin joint 11 are mechanically joined via the load transmission key 31A (31) so that relative movement in the vertical direction is impossible.

  In joining the lower steel pipe 10 </ b> A and the connecting member 20, the four joints provided around the pin joint 11 at the joint portion between the pin joint 11 of the lower steel pipe 10 </ b> A and the box joint 22 of the connecting member 20. A key arrangement portion is formed by aligning the key groove 11E with four key grooves 22E among the eight key grooves 22E provided around the box joint 22 in the circumferential direction. Since the rotation suppression key 30A (30) is disposed in the portion, the jointed pin joint 11 and the box joint 22, that is, the lower steel pipe 10A and the connecting member 20 are prevented from rotating relatively. Is done.

  The pin joint 21 of the connecting member 20 has the same configuration as the pin joint 11 of the lower steel pipe 10A. In the pin joint 21, a fitting insertion portion 21B having a smaller diameter than the cylindrical portion 21A is extended continuously from the cylindrical portion 21A having an outer diameter substantially the same as the outer diameter of the lower steel pipe 10A.

  The base end portion of the fitting insertion portion 21B is provided with a concave portion 21C that is connected to the lower end portion of the box joint 12 of the upper steel pipe 10B over the entire circumference, and is connected to the convex portion 12C that is provided over the entire circumference. A convex portion 21D for insertion into a concave portion 12D (see FIG. 2) provided over the entire circumference at the base end portion of the inner periphery of the box joint 12 of the upper steel pipe 10B is provided at the upper end portion of the fitting insertion portion 21B over the entire circumference. Is provided. A key groove 21F for fitting the load transmission key 31B (31) is provided on the entire outer periphery of the insertion portion 21B. Four key grooves 21E are provided on the outer periphery of the cylindrical portion 21A at equal intervals over the entire periphery.

  When the connecting member 20 and the upper steel pipe 10B are joined together, the load transmission key 31B (31) disposed at the tip of the set bolt 12H is tightened by the tightening operation of the set bolt 12H disposed in the box joint 12. ) Is projected from the key groove 12F to the key groove 21F of the pin joint 21 facing radially inward, and the load transmission key 31B (31) is disposed across both the box joint 12 and the pin joint 21. Thus, the box joint 22 and the pin joint 11 are mechanically joined via the load transmission key 31B (31) so that relative movement in the vertical direction is impossible.

  In joining the connecting member 20 and the upper steel pipe 10B, four keys provided around the pin joint 21 are provided at a joint portion between the pin joint 21 of the connecting member 20 and the box joint 12 of the upper steel pipe 10B. A key arrangement part is formed by aligning the groove 21E and the four key grooves 12E provided around the box joint 12 in the circumferential direction, and a rotation inhibiting key 30B (30) is arranged on the key arrangement part. By being provided, the jointed pin joint 21 and the box joint 12, that is, the connection member 20 and the lower steel pipe 10 </ b> A are prevented from relatively rotating.

  Below, the connection method using the connection member 20 of 10 A of lower steel pipes and the upper steel pipe 10B is demonstrated.

The lower splicing step is performed as follows. When the lower steel pipe 10A is driven into the ground with a hammer or a press-fitting device (intermediate press-fitting, rotary press-fitting, press-fitting), and the lower steel pipe 10A is driven into the ground to some extent, the axis CA of the lower steel pipe 10A Measure the verticality of.
At this time, if the verticality of the axis CA of the lower steel pipe 10A is within a predetermined vertical threshold, the upper steel pipe 10B lifted by the crane is suspended thereon.

The box joint 12 and the pin joint 11 are positioned in the vertical direction by attaching the convex part 12C of the box joint 12 and the concave part 11C of the pin joint 11 and the convex part 11D of the pin joint 11 and the concave part 12D of the box joint 12 respectively. Is done.
And by arrange | positioning the rotation suppression key 30 in a predetermined position, the lower steel pipe 10A and the upper steel pipe 10B are joined so that the relative rotation around an axial center is impossible.

  Further, by turning the set bolt 12H in the forward direction with a hexagon wrench, the load transmission key 31 advances radially inward along the axis of the set bolt 12H and enters the key groove 11F of the pin joint 11. The lower steel pipe 10 </ b> A and the upper steel pipe 10 </ b> B are joined via the load transmission key 31 so that relative movement in the vertical direction is impossible.

Thereafter, from the outside of the box joint 12, the embedded depth of the set bolt 12H is measured with a depth gauge or the like, and it is confirmed that the load transmission key 31 is securely fitted in the key groove 11F.
Thus, the joining of the pin joint 11 and the box joint 12 is completed. By repeating this operation until the steel pipe pile has a predetermined length, a steel pipe pile in which a plurality of steel pipes 10 are vertically connected is completed.

  By the way, as shown in FIG. 4, when the lower steel pipe 10A is driven into the ground to some extent, if the axis CA of the lower steel pipe 10A is inclined from the vertical direction by a predetermined vertical threshold, The connecting member 20 lifted by the crane is suspended.

  The positioning step and key straddling step are performed as follows. In the lower side joining step, four key grooves 22E among the eight key grooves 22E of the connecting member 20 are positions where the four key grooves 11E of the lower steel pipe 10A coincide with each other. The connecting member 20 is rotated and adjusted to the position where the axis CB of the upper steel pipe 10B joined to the pin joint 21 of the member 20 is most along the vertical direction, while being suspended from the lower steel pipe 10A, and the load transmission key 31A. The rotation suppression key 30A is disposed at a predetermined position.

  The number of key grooves 22E is not limited to eight. What is necessary is just to be provided in the position which can oppose the keyway 11E. Therefore, if another key groove 22E group is provided at a position where the key groove 22E group is deviated by a predetermined angle in the circumferential direction with reference to the four key grooves 22E facing the key groove 11E. Good. In the present embodiment, since the eight key grooves 22W are provided at positions deviated by 45 degrees in the circumferential direction, the connecting member 20 can be positioned by 45 degrees with respect to the lower steel pipe 10A. The number of key grooves 22E may be equal to or greater than the number of key grooves 11E, and by providing more key groove groups 22E, the connecting member 20 is positioned in the circumferential direction at smaller angles with respect to the lower steel pipe 10A. You can also. For example, if 16 key grooves 22E are provided at equal intervals over the entire circumference, the positioning pitch is 22.5 degrees.

  The selection step is performed as follows. As shown in FIG. 5, for example, when connecting members 20A, 20B, and 30C having different inclination angles such as θ1 = 0.05 degrees, θ2 = 0.10 degrees, and θ3 = 0.15 degrees are prepared in advance. In accordance with the inclination of the axis CA of the lower steel pipe 10A from the vertical direction, the connecting member 20 that allows the axis CB of the upper steel pipe 10B joined thereto to be most vertically aligned is selected and used. be able to. In addition, the said inclination | tilt angle (theta) is an illustration, Moreover, the type of the connection member 20 is not restricted to the said 3 types, One type, 2 types, or more than 4 types may be sufficient.

  The upper splicing step is performed as follows. After the lower joining step, the upper steel pipe 10B is hung on the connecting member 20, and the load transmission key 31B and the rotation suppression key 30B are arranged at predetermined positions, thereby connecting the lower steel pipe 10A and the upper steel pipe 10B. The connection via the member 20 is completed (connection step).

  The number and arrangement positions of the rotation suppression keys 30 described above are examples. In joining the connecting member 20 to the lower steel pipe 10A, the number of key grooves 22E provided around the box joint 22 is larger than the number of key grooves 11E provided around the pin joint 11 of the lower steel pipe 10A. It is sufficient that fine adjustment in the circumferential direction is possible.

The connection structure with lower steel pipe 10A and upper steel pipe 10B with which connecting member 20 concerning the present invention is provided is not restricted to the above-described pin joints 11 and 21 and box joints 22 and 12.
Another aspect of the joint structure provided in the connecting member 20 according to the present invention will be described in detail. In the following description, only a configuration that is particularly different from the first mode will be described in detail, and description of the same configuration as the first mode will be simplified or omitted.

  As a second aspect, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-189246 (see FIG. 2), an annular groove is provided in the vicinity of a joining portion between the connecting member 20 and the lower steel pipe 10A or the upper steel pipe 10B. A plurality of cylindrical inner rings each having an annular ridge to be inserted into the annular groove and having an outer diameter tapered are externally fitted to a connecting portion of the connecting member 20 and the lower steel pipe 10A or the upper steel pipe 10B. A steel pipe (10A, 10B) and a connecting member are obtained by externally fitting an outer ring having the same taper on the inner surface of the inner ring, pressing the outer ring in the longitudinal direction, and tightening the inner ring by the taper. The structure which joins 20 may be sufficient.

Further, as a third aspect, it may be configured as disclosed in, for example, JP-A-54-4411 (see FIG. 1).
That is, a bowl-shaped tapered inner surface that extends upward is formed at the upper end of the lower steel pipe 10A, and an annular inner groove is formed below it to form a first engagement surface. The upper end portion of the connecting member 20 has the same configuration.
Correspondingly, a tapered outer surface narrowed downward is formed at the lower end portion of the connecting member 20, and an annular outer groove is formed above the tapered outer surface to form a second engagement surface. The lower end portion of the upper steel pipe 10B has the same configuration.
The tapered inner surface and the tapered outer surface are designed so that the inner diameter and outer diameter thereof are predetermined.
When this configuration is adopted, the lower steel pipe 10A and the connecting member 20 are joined as follows. When the connecting member 20 is lowered onto the lower steel pipe 10A, the tip of the tapered outer surface of the connecting member 20 is introduced into the tapered inner surface of the lower steel pipe 10A, and the connecting member 20 is gradually lowered, the tapered outer surface is While sliding along the inner surface of the taper, it narrows inward and enters. When the tapered outer surface rubs through the tapered inner surface, the tapered outer surface that has been narrowed is elastically restored to the original shape, the second engagement surface meshes with the first engagement surface, and the lower steel pipe 10A and The joining with the connecting member 20 is completed.

  According to the second and third aspects, even if the lower steel pipe 10A or the upper steel pipe 10B constituting the steel pipe pile and the connecting member 20 are rotated relative to each other, the mechanism for preventing the joint portion from coming off is the relative rotation. Not affected. That is, the joining of the joined portions is not released by the relative rotation of the joined members. Then, like the positioning step and the key straddling step in the first aspect, the four key grooves 22E among the eight key grooves 22E of the connecting member 20 are the four key grooves 11E of the lower steel pipe 10A. , The rotation of the connecting member 20 is adjusted to a position where the axis CB of the upper steel pipe 10B joined to the connecting member 20 is along the most vertical direction, and the rotation inhibiting key 30A is set to a predetermined position. By disposing, the lower steel pipe 10A and the connecting member 20 are joined together so that relative rotation around the axis is impossible. The connection between the connecting member 20 and the upper steel pipe 10B is performed in the same manner.

In addition, description about the above-mentioned 2nd aspect and the 3rd aspect does not prevent adoption of the joining structure which is disclosed by Unexamined-Japanese-Patent No. 2004-92291, for example.
That is, as a fourth aspect, as a joining structure of the connecting member 20 with the lower steel pipe 10A and the upper steel pipe 10B, for example, a female cylinder that can be inserted into and removed from the joining portion of the lower steel pipe 10A and the connecting member 20. And male cylinders, and when the male cylinder is inserted into the female cylinder and rotated, the male / female cylinder pile axial crimp end face and the male / female cylinder mating surface have intermittent irregularities (inner and outer projections). The upper and lower piles are configured to be fixed. Also in this case, similarly to the positioning step in the first aspect, the axis of the upper steel pipe 10B disposed above the connecting member 20 is disposed so as to be along the most vertical position at each position where both members can be inserted. can do.

A joint structure as disclosed in JP-A-10-121467 can also be employed.
That is, as a fifth aspect, as a joint structure of the connecting member 20 with the lower steel pipe 10A and the upper steel pipe 10B, for example, a cylindrical side plate disposed at the upper end of the lower steel pipe 10A and the lower end of the connecting member 20 A plurality of screw holes formed at a predetermined pitch in each cylindrical side plate, and also formed at a predetermined pitch in the connection member. It is also possible to adopt a configuration in which the lower steel pipe 10A and the connecting member 20 are joined by inserting bolts through the plurality of screw holes and fixing the connecting members to the cylindrical side plates. . In this case, similar to the positioning step in the first aspect, the lower steel pipe 10A and the cylindrical side plate of the connecting member 20 and the pitch of the bolt holes formed in the connecting member are arranged above the connecting member 20. The upper steel pipe 10B can be disposed so that the axis of the upper steel pipe 10B extends along the most vertical direction.

  Further, as the connecting member 20 according to the sixth aspect, unlike the first aspect, a key groove for disposing the rotation inhibiting key 30 and the rotation inhibiting key 30 in the pin joints 11 and 21 and the box joints 22 and 12. 11E, 12E, 21E, 22E are not provided, a joint portion between the lower steel pipe 10A and the upper steel pipe 10B, a joint portion between the lower steel pipe 10A and the connecting member 20, and the connecting member 20 and the upper steel pipe 10B. It is also possible to adopt a configuration in which the joint portion is fixed by welding. In the configuration according to the second aspect, since the respective parts are fixed relative to each other by physical contact, the shafts of both the steel pipes are used for the centering of the steel pipes joined to each other as in the prior art. Welding can be performed more easily than when welding is performed in a state where the angle formed by the heart is maintained at a predetermined value.

In the connecting member 20 according to the first aspect, since the rotation inhibiting key 30 is straddled between the pin joints 11 and 21 and the box joints 22 and 12, the key grooves 11E and 22E are disposed at the positioning step. Only circumferential positioning is possible.
However, in the connecting member 20 according to the sixth aspect, the adjustment step, that is, when the pin joint 11 of the lower steel pipe 10A and the box joint 22 of the connecting member 20 are joined, the pin joint 21 of the connecting member 20 is provided. In adjusting the circumferential position of the connecting member 20 so that the second joining axis is most along the vertical direction, the key groove 11E and the key groove 22E are arranged to straddle the rotation inhibiting key 30 as in the positioning step. Therefore, it is excellent in that the direction of the connecting member 20 can be adjusted more finely.

  In the above-described embodiment, the case where the connecting member according to the present invention is applied to the connection of the steel pipes constituting the steel pipe pile has been described, but the connecting member according to the present invention is a steel pipe sheet pile obtained by combining a plurality of steel pipes in a closed shape. It can also be applied to the connection of steel pipes constituting steel pipe sheet piles in a well foundation.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. is there.

10 Steel Pipe 10A Lower Steel Pipe 10B Upper Steel Pipe 20 Connecting Member 21 Pin Joint (Second Joint)
21E Keyway 22 Box joint (first joint)
22E Keyway 30 (30A, 30B) Rotation inhibition key 31 (31A, 31B) Load transmission key CA First joint axis CB Second joint axis θ (θ1, θ2, θ3) Inclination angle

Claims (7)

It is a connecting member for connecting a plurality of steel pipes constituting a steel pipe pile by being connected in the vertical direction,
An upper end portion of a lower steel pipe disposed below, and a first joining portion that can be joined along a first joining axis that coincides with the axis of the lower steel pipe;
A lower end portion of the upper steel pipe disposed above, and a second joining portion that can be joined along a second joining axis that coincides with the axis of the upper steel pipe,
The first connecting portion and the second connecting portion are configured such that the second connecting shaft center has a predetermined inclination angle with respect to the first connecting shaft center. Element. A connecting member for connecting a plurality of steel pipes in the vertical direction,
Among the upper end portion of the lower steel pipe disposed below and the lower end portion of the upper steel pipe disposed above, which are configured to be directly connectable to each other by fitting,
A first joining portion that can be joined along the upper end portion and a first joining axis that coincides with the axis of the lower steel pipe;
The lower end portion, and a second joint portion that can be joined along a second joint axis that coincides with the axis of the upper steel pipe,
The first connecting portion and the second connecting portion are configured such that the second connecting shaft center has a predetermined inclination angle with respect to the first connecting shaft center. Element. A connecting member for connecting a plurality of steel pipes in the vertical direction,
An upper end portion of a lower steel pipe disposed below, and a first joining portion that can be joined along a first joining axis that coincides with the axis of the lower steel pipe;
A lower end portion of the upper steel pipe disposed above, and a second joining portion that can be joined along a second joining axis that coincides with the axis of the upper steel pipe,
The first joint part and the second joint part are configured such that the second joint axis has a predetermined inclination angle with the first joint axis,
Relative rotation about the axis of the lower steel pipe joined to the first joint part between the first joint part and the key groove provided around the upper end of the lower steel pipe A keyway that can straddle a rotation suppression key to prevent
The connecting member according to claim 1, wherein the number of key grooves provided around the first joining portion is greater than the number of key grooves provided around the upper end of the lower steel pipe. In order to connect multiple steel pipes in the vertical direction,
An upper end portion of a lower steel pipe disposed below, and a first joining portion that can be joined along a first joining axis that coincides with the axis of the lower steel pipe;
A lower end portion of the upper steel pipe disposed above, and a second joining portion that can be joined along a second joining axis that coincides with the axis of the upper steel pipe,
The first joint portion and the second joint portion include a plurality of connecting members configured such that the second joint axis has a predetermined inclination angle with the first joint axis . A connecting member unit,
The connecting member unit, wherein the plurality of connecting members have different inclination angles. In order to connect multiple steel pipes in the vertical direction,
An upper end portion of a lower steel pipe disposed below, and a first joining portion that can be joined along a first joining axis that coincides with the axis of the lower steel pipe;
A lower end portion of the upper steel pipe disposed above, and a second joining portion that can be joined along a second joining axis that coincides with the axis of the upper steel pipe,
The first joining portion and the second joining portion are a plurality of connecting members configured such that the second joining axis has a predetermined inclination angle with respect to the first joining axis. A connecting method for connecting the steel pipes in the vertical direction,
A lower joining step for joining the upper end portion of the lower steel pipe disposed below and the first joining portion provided in the connecting member;
After the lower joining step, an upper joining step for joining the second joining portion provided in the connecting member and the lower end portion of the upper steel pipe disposed above,
When the upper end of the lower steel pipe and the first joint are joined to the lower joint step, the second joint axis of the second joint included in the connecting member is the most vertical. The connection method characterized by including the adjustment step which adjusts the position of the said connection member so that a direction may be followed. A connecting method for connecting a plurality of steel pipes in the vertical direction using the connecting member according to claim 3 ,
The lower joining step for joining the upper end portion of the lower steel pipe disposed below and the first joining portion provided in the connecting member,
Of the key groove provided around the first joint portion, the second joint portion of the connecting member is provided when the upper end portion of the lower steel pipe and the first joint portion are joined. A positioning step in which a key groove whose second joining axis is most along the vertical direction is opposed to a key groove provided around an upper end of the lower steel pipe;
And a key straddling step of straddling a rotation inhibiting key between the two key grooves. A connecting method for connecting a plurality of steel pipes in the vertical direction using the connecting member unit according to claim 4 ,
According to the inclination from the vertical direction of the axis of the lower steel pipe disposed below,
The first joint of the second joint axis so that the axis of the upper steel pipe disposed above when the two steel pipes are vertically connected from the plurality of connecting members is along the most vertical direction. A selection step of selecting a connecting member having an inclination angle with respect to the axis;
A connecting step of connecting the lower steel pipe and the upper steel pipe using the connecting member selected in the selecting step.

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