JPH0827774A - Fitting joint member and fitting joint part structure - Google Patents

Abstract

PURPOSE:To improve strength of fitting joint part structure by improving bond strength of a joint steel pipe with a projection (T type steel with a projection) and mortar. CONSTITUTION:A steel pipe sheet pile 61 is connected to a T type steel 12 with a projection which is a male fitting joint by engagement of a joint steel pipe 11 with a projection which is a female fitting joint. Mortar 40 is deposited inside of the joint steel pipe 11 with the projection. A plural number of projections 30 are provided on the pipe internal surface of the joint steel pipe 11 with the projection and on the surface of the T type steel 12 with the projection. The longitudinal direction of the projections 30 is made to make a specified angle against the pipe axial direction of the joint steel pipe 11 with the projection and the lengthy direction of the T type steel 12 with the projection. Consequently, bond strength of the coupler steel pipe 11 with the projection (the T type steel 12 with the projection) and the mortar 40 is improved against shearing force of the joint steel pipe 11 with the projection in the pipe axial direction (the lengthy direction of the T type steel 12 with the projection).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe sheet pile, a steel pipe sheet fitting joint member, and a fitting joint portion structure.

[0002]

2. Description of the Related Art One of the conventional foundations for underground structures is a steel pipe sheet pile foundation. The steel pipe sheet pile type foundation constructs the wall of the steel pipe sheet pile by arranging multiple rows of steel pipe sheet piles adjacent to each other in the ground.
The foundation is to enclose a certain area of ground with the wall of steel pipe sheet pile. Each steel pipe sheet pile is connected via a fitting joint member.

FIG. 10 is a view showing a schematic top view of a fitting joint portion structure in a conventional steel pipe sheet pile type foundation. Figure 10
Inside, 1 is a joint steel pipe, 111 is a slit portion, 2 is T-shaped steel,
121 is a stem part, 40 is a mortar, 61 is a steel pipe sheet pile,
70 indicates the ground.

In the fitting joint structure shown in FIG. 10, the fitting steel pipe 1 is a female fitting joint and the T-shaped steel 2 is a male fitting joint. The joint steel pipe 1 is a cylindrical steel pipe in which a slit portion 111 parallel to the pipe axis direction is formed. The joint steel pipe 1 and the steel pipe sheet pile 61 are welded so that the pipe axis directions coincide with each other. The T-shaped steel 2 and the steel pipe sheet pile 61 are welded so that the length direction of the T-shaped steel 2 and the pipe axis direction of the steel pipe sheet pile 61 match. Mortar 40 is placed in the fitting portion of the fitting joint portion structure. The shape of the mortar 40 cast in the fitting portion is restrained by the joint steel pipe 1 from the outside.

When an external force in the horizontal direction acts on the steel pipe sheet pile foundation due to an earthquake or the like, the steel pipe sheet pile tries to rotate because the lower end portion of the steel pipe sheet pile is fixed to the support layer. In the fitting joint structure between the steel pipe sheet piles, the fitting joint member tends to shift vertically in the longitudinal direction. As a result, the cement-based solidifying material such as mortar or concrete cast in the fitting portion receives the shearing force in the longitudinal direction of the fitting joint member. Also,
When the load applied to the steel pipe sheet pile in the steel pipe sheet pile type foundation is not uniform, the cement-based solidifying material cast in the fitting portion receives shearing force in the longitudinal direction of the fitting joint member.

In a foundation structure composed of a plurality of steel materials as represented by a steel pipe sheet pile type foundation, in order to obtain sufficient strength as a foundation, it is necessary that the steel materials constituting the foundation function integrally with an external force. is there. Therefore, it is necessary to enhance the strength of the fitting joint structure made of steel. In order to improve the strength of the fitting joint portion structure against the longitudinal shearing force of the fitting joint member, it is necessary to improve the adhesive strength at the joint interface between the fitting joint member and the cement-based solidifying material.

[0007]

However, in the conventional fitting joint structure, the adhesive strength at the joining interface between the fitting joint member and the solidifying material is weak, and the fitting joint member is fitted with a long-term shearing force. There is a problem that the joint material and the solidified material are easily separated. Therefore, there is a problem in that the strength of the fitting joint portion structure against the longitudinal shearing force of the fitting joint member is weak.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fitting joint member for strengthening the integration between steel pipe sheet piles.

[0009]

According to a first aspect of the present invention, there is provided a fitting joint member for connecting horizontally adjacent steel materials, wherein a plurality of projections or protrusions are provided on a fitting surface of the fitting joint member. The fitting joint member is characterized in that a line is provided.

According to a second aspect of the present invention, there is provided a female mold in which a plurality of reinforcing ridges having a predetermined length are provided on the outer surface of the fitting portion of the fitting joint member. It is a fitting joint member of.

According to a third aspect of the present invention, there is provided a fitting joint portion structure for connecting horizontally adjacent steel materials, wherein a plurality of protrusions or ridges are fitted to the fitting surface of the fitting joint member. The fitting joint portion structure is characterized in that it is provided on the joint member and the cement-based solidifying material is filled in the fitting portion.

In the present invention, the cement-based solidifying material means a solidifying material to which cement is added as one component, such as concrete, mortar and soil cement.

[0013]

In the fitting joint portion structure of the invention of claim 1, the fitting portion is filled with the cement-based solidifying material. A plurality of protrusions or ridges are provided on the fitting surface of the fitting joint member. For this reason,
The adhesive strength at the joint interface between the fitting joint member and the cementitious solidifying material is greater than the shearing force in the longitudinal direction of the fitting joint member. That is, when no protrusions or ridges are provided on the fitting surface of the fitting joint member, the shearing force required to separate the joint interface between the fitting joint member and the cement-based solidifying material is the solidification of the fitting joint member and the cement-based solidifying material. It corresponds to the adhesive force on the surface of the material. On the other hand, when a protrusion or a ridge is provided on the fitting surface of the fitting joint member, the cement-based solidifying material at the valley of the protrusion or the ridge is
It is not possible to slip on the joint interface between the fitting joint member and the cement-based solidifying material beyond the protrusion or the ridge portion. Therefore, in order to cause the separation of the fitting joint member and the cement-based solidifying material, (1) the cement-based solidifying material is sheared and broken, and the cement-based solidifying material in the valleys of the protrusions or ridges is separated from other parts. Separation or (2) Cement-based solidification material is compressed near the projections or ridges due to vertical force and compressively fractures, and the cement-based solidification material at the valleys of the projections or ridges separates from other parts. Either (3) or the deformation of the protrusion or the ridge must occur. As a result, in order to cause peeling of the joint interface between the fitting joint member and the cement-based solidifying material, in addition to the adhesive force on the surface of the fitting joint member and the cement-based solidifying material, shear fracture of the cement-based solidifying material, Shearing force is required to generate either compression failure of the cement-based solidifying material or deformation of the protrusions or ridges. Therefore, by providing a protrusion or a ridge on the fitting surface of the fitting joint member, it is possible to improve the adhesion strength of the joining interface between the fitting joint member and the cement-based solidifying material against the shearing force in the longitudinal direction of the fitting joint member. You can As a result, there is an effect that it is possible to improve the strength of the fitting joint portion structure against the longitudinal force of the fitting joint member.

The fitting joint member of the invention of claim 1 is one in which a plurality of protrusions or ridges are provided on the fitting surface of the fitting joint member. Thereby, when the fitting joint structure is formed using the fitting joint member according to the first aspect, it is possible to improve the adhesion strength between the cement-based solidified material cast in the fitting portion and the fitting joint member.

According to a second aspect of the present invention, a plurality of reinforcing protrusions are provided on the outer surface of the fitting portion of the female fitting joint member according to the first aspect.
It is intended to improve the rigidity of the female fitting joint member mainly in the direction perpendicular to the axis. Generally, when a tensile force acts on the fitting joint, the opening of the female fitting joint member is deformed to increase the opening amount, and finally the male fitting joint member is completely pulled out from the opening. . In the present invention, since a plurality of reinforcing ridges are provided on the outer surface of the fitting portion of the female fitting joint member according to claim 1, the rigidity of the fitting joint in the direction perpendicular to the axis is improved and the opening is deformed. Is suppressed, and as a result, the tensile strength of the fitting joint structure can be improved.

According to a third aspect of the present invention, the cemented solidifying material is filled in the fitting portion of the fitting joint according to the first or second aspect. By filling the fitting portion of the fitting joint with the cement-based solidifying material, the waterproofness of the fitting joint portion is ensured and the fitting is further strengthened.

[0017]

1 is a schematic sectional view showing an embodiment of a fitting joint portion structure according to the invention of claim 3. In FIG. In FIG. 1, 11 is a joint steel pipe with protrusions, 111 is a slit portion, 12 is a T-shaped steel with protrusions, 121 is a stem portion, 30 is a protrusion, 40 is a mortar,
Reference numeral 61 indicates a steel pipe sheet pile, 611 indicates a welded portion, and 70 indicates the ground.

In the fitting joint structure shown in FIG. 1, a T-shaped steel 12 with protrusions is used as a male fitting joint member, and a slit portion 11 is formed in the pipe axial direction.
The cylindrical jointed steel pipe 11 with the projection 1 therein is used as a female fitting joint member. The T-shaped steel 12 with protrusions and the steel pipe sheet pile 61 are
Welding is performed so that the length direction of the T-shaped steel 12 with protrusions and the pipe axis direction of the steel pipe sheet pile 61 are parallel. The joint steel pipe 11 with protrusions and the steel pipe sheet pile 61 are welded so that the pipe axis directions are parallel to each other.

The steel pipe sheet pile 61 is driven into the ground 70 by a driving method. Joint steel pipe with projection 11 and T-shaped steel with projection 1
The fitting of 2 is as follows: (1) Above the existing steel pipe sheet pile 61, the position of the stem portion 121 of the T-shaped steel 12 with protrusions of the subsequent steel pipe sheet pile 61 is set to the joint steel pipe with protrusions 1 of the existing steel pipe sheet pile 61.
After aligning with the slit portion 111 of No. 1, (2) the subsequent steel pipe sheet pile 61 is driven into the ground 70.

Mortar 40 is placed in the fitting portion between the T-shaped steel 12 with protrusions and the joint steel pipe 11 with protrusions. Mortar 40 is
The shape is constrained from the surroundings by the joint steel pipe 11 with protrusions. Therefore, the mortar 4 placed in the fitting part
The breaking strength of 0 is improved by the confined effect.

A plurality of checker-like projections 3 are formed on the surface of the T-shaped steel 12 with projections and on the inner surface of the jointed steel pipe 11 with projections.
0 is set. By providing the checker-shaped ridges 30 on the surface of the T-shaped steel with projection 12 and the inner surface of the jointed steel pipe with projection 11, the adhesive strength between the mortar 40 and the T-shaped steel with projection 12 and the mortar 40 and the jointed steel pipe with projection 11 is provided. It is possible to improve.

FIG. 2 is an explanatory view for explaining the influence of a projection or a ridge on the adhesion strength between the fitting joint member and the mortar. FIG. 2 shows a cross section of the fitting joint member,
In FIG. 2, 10 is a fitting joint member, 30 is a protrusion, 31 is a mountain portion, 32 is a valley portion, and 40 is a mortar.

Consider a case where a shearing force acts on the joint interface between the fitting joint member 10 provided with the projection 30 and the mortar 40 as shown in FIG. If no protrusions (or ridges) are provided on the fitting surface of the fitting joint member, the shearing force required to separate the joint interface between the fitting joint member and mortar is the adhesive force between the surface of the fitting joint member and the mortar. Equivalent to. On the other hand, when the projection 30 is provided on the fitting surface of the fitting joint member 10 as shown in FIG. 2, the mortar 40 in the valley portion 32 of the projection 30 is fitted over the peak portion 31 of the projection 30. The joint interface between the joint member 10 and the mortar 40 cannot slide. For this reason,
In order to cause the separation of the fitting joint member 10 and the mortar 40, (1) in FIG. 2, A- perpendicular to the paper surface and along the dotted line
The mortar 40 is sheared and broken on the surface A, and the valley 3 of the protrusion 30 is broken.
The mortar 40 of No. 2 is separated from the other portions of the mortar 40, or (2) the mortar 40 is compressed near the protrusions 30 by the force applied to the joint interface between the fitting joint member 10 and the mortar 40, and is crushed by compression. The mortar 40 in the valley 32 of the protrusion 30 must be separated from the other portions of the mortar 40, or either (3) or the deformation of the protrusion 30 must occur. As a result, in order to cause peeling of the joint interface between the fitting joint member 10 and the mortar 40, in addition to the adhesive force on the surfaces of the fitting joint member 10 and the mortar 40, shear fracture of the mortar 40 and compression of the mortar 40 occur. Extra shear is required to either break or deform the protrusions 30. Therefore, the protrusion 3 is formed on the fitting surface of the fitting joint member 10.
By providing 0, the fitting joint member 10 and the mortar 4
It is possible to improve the adhesive strength of the bonding interface of 0. For the same reason, by providing a protrusion on the fitting surface of the fitting joint member 10, it is possible to improve the adhesion strength at the joint interface between the fitting joint member 10 and the mortar 40.

FIG. 3 is a schematic plan view showing an embodiment of a method of arranging the protrusions provided on the surface of the T-shaped steel 12 with protrusions and the joint steel pipe with protrusions 11 in the embodiment shown in FIG. In FIG. 3, reference numeral 30 denotes a protrusion, and 20 denotes a fitting surface of the fitting joint, that is, the surface of the T-shaped steel 12 with a projection or the inner surface of the joint steel pipe 11 with a projection. Incidentally, in FIG. 3, the lower diagram is a cross-sectional view taken along the line BB of the schematic plan view shown in the upper diagram.

The arrangement method of the protrusions 30 shown in FIG.
The longitudinal direction of 0 forms an angle of 45 ° with the longitudinal direction of the fitting joint member (that is, the length direction of the T-shaped steel 12 with protrusions, the pipe axis direction of the steel pipe joint 11 with protrusions).
The projections 30 are arranged in a checkered pattern. Protrusion 3
Since the longitudinal direction of 0 has an angle with the longitudinal direction of the fitting joint, the mortar 40 and the fitting joint member (projection joint steel pipe 11, projection T-shaped steel with respect to the shearing force in the longitudinal direction of the fitting joint member). It is possible to improve the adhesion strength of 12).
As a result, it is possible to improve the strength of the fitting joint portion structure against the force in the longitudinal direction of the fitting joint member (the joint steel pipe with protrusion 11 and the T-shaped steel 12 with protrusion). Similarly, in the case of ridges as well, by making an angle in the longitudinal direction of the ridges and the longitudinal direction of the fitting joint, it is possible to improve the strength of the fitting joint structure against the force in the longitudinal direction of the fitting joint. it can.

Further, as shown in FIG. 3, the longitudinal direction of the protrusion 30 is such that the fitting joint member (joint steel pipe with protrusion 11, T with protrusion).
It also has an angle with respect to the direction perpendicular to the longitudinal direction of the shaped steel 12), so that the strength of the fitting joint structure against tensile force can be improved at the same time. When a tensile force is applied to the fitting joint structure, (1) first, the cement-based solidifying material such as mortar or concrete and the jointed steel pipe with projection (that is, the female fitting joint member) are separated, 2) As the tensile force increases, the jointed steel pipe with protrusions deforms and the slit portion opens, so that the fitting joint structure is broken. By fitting an angle in the longitudinal direction of the protrusion 30 with respect to the direction perpendicular to the longitudinal direction of the fitting joint member (joint steel pipe with protrusion 11, T-shaped steel 12 with protrusion), the fitting joint member (joint steel pipe with protrusion) 11, a T-shaped steel with projection 12) having a force perpendicular to the longitudinal direction, that is, a tensile force applied to the structure of the fitting joint, of the fitting joint member (joint steel pipe with projection 11, T-shaped steel with projection 12) and the cement-based solidifying material. It is possible to improve the adhesion strength. As a result, it is possible to improve the tensile force required to deform the jointed steel pipe with projection 11. Therefore, by making an angle in the longitudinal direction of the protrusion 30 with respect to the direction perpendicular to the longitudinal direction of the fitting joint member (joint steel pipe with protrusion 11, T-shaped steel 12 with protrusion), the tensile force of the fitting joint portion structure is increased. At the same time, strength against force can be improved. Similarly, in the case of ridges as well, by making an angle in the longitudinal direction of the ridge with respect to the direction perpendicular to the longitudinal direction of the fitting joint, the strength of the fitting joint structure against tensile force is also improved. be able to.

Further, conventionally, when the steel pipe sheet pile is built by the driving method, the fitting portion of the fitting joint member is filled with the earth and sand of the ground. Therefore, conventionally, before the cement-based solidifying material such as mortar is placed in the fitting part, the earth and sand filled in the fitting part is removed by the force of the water flow (hereinafter, "discharging").
Had to do so). The present invention provides a protrusion (or a ridge) such that the longitudinal direction of the protrusion (or ridge) provided on the fitting surface of the fitting joint member forms a predetermined angle with the longitudinal direction of the fitting joint member. ) By arranging
Increase the friction coefficient between the mating surface and the ground. As a result, when a steel pipe sheet pile is driven into the ground, it is possible to reduce the amount of earth and sand filled in the fitting part of the fitting joint structure due to the effect of blocking the tip, and to reduce the time and effort for earth removal. You can

FIG. 4 is a schematic perspective view showing an embodiment of the female fitting joint member of claim 3. In FIG. 4, 11 is a joint steel pipe with a protrusion, 111 is a slit portion, 12 is a T-shaped steel with a protrusion, 50 is a reinforcing ridge, and 61 is a steel pipe sheet pile. In FIG. 4, the inner surface of the joint steel pipe with protrusion 11 and the surface of the T-shaped steel 12 with protrusion are provided with protrusions each having a predetermined length in a direction forming a predetermined angle in the vertical direction. (The protrusion is not shown.)

A female fitting joint member according to a third aspect shown in FIG. 4 is a female fitting joint member according to the second aspect, in which a horizontal reinforcing ridge 50 is provided on the outer peripheral surface of the jointed steel pipe 11 having a projection. It is provided to enhance the rigidity of the jointed steel pipe with projection 11 against the force in the horizontal direction. This makes it difficult for the joint steel pipe with projection 11 to be deformed by the tensile force acting on the fitting joint portion structure. As a result, it is possible to improve the strength of the fitting joint portion structure against the tensile force. The reinforcing ridge 50 may be provided by welding the steel pipe sheet pile 61 and the joint steel pipe 11 with protrusions and then welding the outer peripheral surface of the joint steel pipe 11 with protrusions.

FIG. 5 is a vertical sectional view showing another embodiment of the fitting joint portion structure of the present invention. Figure 5
Inside, 11 is a jointed steel pipe with protrusions, 12 is a T-shaped steel with protrusions, 13
Is a L-shaped steel with protrusions, 40 is a concrete, 61 is a steel pipe sheet pile, and 70 is a ground. In FIG. 5, protrusions are provided on the inner surface of the joint steel pipe with protrusions 11, the surface of the T-shaped steel 12 with protrusions, and the surface of the L-shaped steel 13 with protrusions. (The protrusion is not shown.)

As shown in FIG. 5, the type of the fitting joint portion structure of the present invention is not limited to only the fitting joint portion structure formed by the combination of the jointed steel pipe 11 with protrusions and the T-shaped steel 12 with protrusions. . For example, as shown in FIG. 5 (a), a fitting joint in which two L-shaped steel 13 with protrusions are welded to a steel pipe sheet pile 61 so as to face each other and a T-shaped steel 12 with protrusions is used as a male joint member. A partial structure may be formed. Further, as shown in FIG. 5 (b), the joint steel pipes 11 with protrusions having slits in the pipe axial direction may be meshed with each other to form a fitting joint structure.

6 to 8 are schematic plan views showing another embodiment of the method of arranging the protrusions provided on the fitting joint member in the present invention. 6 to 8, reference numeral 30 denotes a protrusion, and 20 denotes a fitting surface of the fitting joint, that is, a surface of the T-shaped steel 12 with a projection or a pipe inner surface of the steel pipe joint 11 with a projection. In addition, in FIGS. 6 to 8, the following figures are sectional views taken along the line BB of the schematic plan view shown in the above figure.

In the present invention, the array form of the protrusions is not limited to the checkered form. For example, as shown in FIG. 6, the shape of the protrusion when viewed from the front may be a cross shape. Further, if the strength of the fitting joint portion structure against the tensile force is not a problem, for example, as shown in FIG. 7, a protrusion having a longitudinal direction parallel to the direction perpendicular to the longitudinal direction of the fitting joint member. You may arrange only. Further, for example, as shown in FIG. 8, protrusions having a longitudinal direction perpendicular to the longitudinal direction of the fitting joint member and protrusions having a longitudinal direction parallel to the longitudinal direction of the fitting joint member are arranged in a checkered pattern. Good.

The present invention is not limited to the method of driving a steel pipe sheet pile. For example, it is used in a construction method in which a row of pillars of soil cement is formed in an excavation hole while excavating the ground with an auger, and then steel pipe sheet piles are successively built in the excavation hole before the soil cement solidifies. May be.

The present invention is not limited to the fitting joint structure of the steel pipe sheet pile. FIG. 9: is the figure which showed an example of the usage method of the fitting joint member of this invention. In FIG. 9, 11 is a joint steel pipe with a protrusion, 12 is a T-shaped steel with a protrusion, 62 is a box-type steel sheet pile, 621 is a flange, 622 is a web, and 623 is a bolt joint for connecting the box-type steel sheet piles 62 to each other in the vertical direction. Small holes, 624, indicate honeycomb-shaped holes. Further, in FIG. 9, the direction perpendicular to the surface normal of the flange 621 and the web 6 are
The direction perpendicular to the surface normal direction of 22 is the material axis direction of the box-shaped steel sheet pile 62.

As shown in FIG. 9, the box-shaped steel sheet pile 62 has a pair of parallel plate-like flanges 621 and a pair of webs 622 vertically attached to the flanges 621. A honeycomb-shaped hole 624 is provided in a portion of the flange surface 621 outside the mounting position of the web 622.
When the box-shaped steel sheet pile 62 is built in the excavation groove excavated in the ground and then the concrete is placed in the excavation groove, the honeycomb-shaped hole 624 is excavated from the flange 621. It is provided to supply to the gap between the groove wall surface and the flange 621.

At the tip of the flange 621, the joint steel tube 11 with a projection and the T-shaped steel 12 with a projection are provided. Steel pipe with protrusion 1
The pipe axis direction of 1 and the length direction of the T-shaped steel 12 with protrusions are
It is parallel to the material axis direction of the box-shaped steel sheet pile 62. Box type steel sheet pile 6
At the time of connecting the two, the joint steel pipe 11 with protrusions of one box-type steel sheet pile 62 and the T-shaped steel 12 with protrusions of the other box-type steel sheet pile 62 are fitted together, and the inside of the joint steel pipe 11 with protrusions is concreted.
Fill with cement-based solidifying material such as gypsum, mortar and soil cement.

Protrusions are provided on the inner surface of the joint steel pipe 11 with protrusions and on the surface of the T-shaped steel 12 with protrusions (protrusions not shown). The longitudinal direction of the projections provided on the inner surface of the steel tube 11 with projections and the surface of the T-shaped steel 12 with projections is the box-shaped steel sheet pile 62.
Make an angle with the material axis direction. As a result, the adhesion strength between the steel pipe with projection 11, the T-shaped steel with projection 12 and the cement-based solidifying material against the shearing force of the box-shaped steel sheet pile 62 in the material axis direction is improved. As a result, it is possible to improve the strength of the fitting joint portion structure against the force of the box-shaped steel sheet pile 62 in the material axis direction.

Further, the joint steel pipe 11 with a projection and the T with a projection
By making the longitudinal direction of the projections provided on the shape steel 12 also have an angle with respect to the material axis direction of the box-shaped steel sheet pile 62, a force perpendicular to the material axis direction of the box-shaped steel sheet pile 62, that is, a tensile force acting on the fitting joint portion structure. With respect to the force, the adhesion strength between the steel pipe with protrusion 11, the T-shaped steel with protrusion 12, and the cement-based solidifying material is improved.
As a result, the strength of the fitting joint structure of the box-shaped steel sheet pile 62 against tensile force can be improved.

[0040]

EFFECTS OF THE INVENTION The fitting joint portion structure and the fitting joint member of the present invention are provided with protrusions or ridges on the fitting surface of the fitting joint member, so that the fitting joint member is resistant to the longitudinal force of the fitting joint member. There is an effect that the strength of the fitting joint portion structure can be improved.

Furthermore, by providing a reinforcing ridge on the outer surface of the female fitting joint member forming the fitting joint structure of the present invention, the tensile strength of the fitting joint structure can be improved. effective.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a fitting joint portion structure of the invention of claim 3.

FIG. 2 is an explanatory diagram for explaining the influence of a protrusion or a ridge on the adhesion strength between a fitting joint member and mortar.
FIG. 2 shows a cross section of the fitting joint member.

3 is a T-shaped steel 12 with protrusions in the embodiment shown in FIG.
FIG. 3 is a schematic plan view showing an example of a method of arranging the surface of the projection and the projections provided in the pipe of the jointed steel pipe 11 with projections.

FIG. 4 is a schematic perspective view showing an embodiment of the female fitting joint member according to claim 2;

FIG. 5 is a cross-sectional view perpendicular to the vertical direction for showing another embodiment of the fitting joint portion structure of the present invention.

FIG. 6 is a schematic plan view showing another embodiment of the method of arranging the protrusions provided on the fitting joint member in the present invention.

FIG. 7 is a schematic plan view showing another embodiment of the method of arranging the protrusions provided on the fitting joint member in the present invention.

FIG. 8 is a schematic plan view showing another embodiment of the method of arranging the protrusions provided on the fitting joint member in the present invention.

FIG. 9 is a diagram showing an example of how to use the fitting joint member of the present invention.

FIG. 10 is a view showing a schematic top view of a fitting joint portion structure in a conventional steel pipe sheet pile type foundation.

[Explanation of symbols]

 11 Jointed Steel Pipe with Protrusion 111 Slit Part 12 T-Shaped Steel with Protrusion 121 Stem Part 20 Fitting Surface of Fitting Joint 30 Protrusion 40 Mortar 50 Reinforcing Ridge 62 Box Steel Sheet Pile 621 Flange 622 Web

Claims (3)

[Claims] 1. A fitting joint member for connecting horizontally adjacent steel materials, wherein a plurality of protrusions or ridges are provided on a fitting surface of the fitting joint member. Fitting joint member. 2. The fitting joint member according to claim 1, wherein a plurality of reinforcing ridges are provided on the outer surface of the fitting portion of the fitting joint member. 3. A fitting joint portion structure for connecting horizontally adjacent steel materials, wherein a plurality of protrusions or ridges are provided on the fitting surface of the fitting joint member of the fitting joint member. The fitting joint structure is characterized in that the cement-based solidifying material is filled in the fitting portion.