JP6971874B2 - Connection structure between steel structure and precast concrete member, structural wall having the connection structure, and connection method between steel structure and precast concrete member - Google Patents

Description

In the present invention, a structural wall using a steel structure buried in the ground with a part protruding above the ground (hereinafter referred to as “steel structural wall”) and precast concrete installed on the upper part of the steel structural wall. Regarding the connection structure with the member.

Steel sheet piles and steel pipe sheet piles are mainly used as steel structural walls buried in the ground. In particular, with regard to steel sheet piles, hat-shaped steel sheet piles, which are superior in workability, structural reliability, and economy to conventional U-shaped steel sheet piles, have been developed and are now widely used. In addition, a type of steel structural wall that combines the water stoppage of a hat-shaped steel sheet pile and the excellent rigidity of a steel pipe pile has also been developed. Such a steel structure wall is not only buried in the ground and used, but also may be used in a state where the upper part is projected above the ground as disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2013-049981

However, since the structural wall disclosed in Patent Document 1 is made of steel, corrosion progresses over time and the landscape is impaired. In particular, when the structural wall of Patent Document 1 is used in a harbor, the ocean, etc., it is used in an environment in contact with seawater where corrosion easily progresses. At the time of construction, anticorrosion treatment is required to cover the surface of the steel material with resin or the like. Although the construction of the steel structural wall itself enables efficient work and is excellent in terms of construction period, the above-mentioned anticorrosion treatment is a disadvantage in terms of construction period.

Therefore, it is conceivable to construct a structural wall using a hybrid structure in which a steel structure is installed in the underground part and a precast concrete member that does not require anticorrosion treatment is installed on the steel structure in the above-ground part. When adopting such a structure, the connection method between the steel structure in the underground and the precast concrete member in the ground is important, but the reinforcing bars of the precast concrete member are welded to the steel structure such as steel sheet pile. There is a problem in terms of construction efficiency.

The present invention has been made in view of the above circumstances, and is a strong and highly efficient connection structure of a steel structure in the ground and a precast concrete member installed on the structure, a connection method thereof, and the connection structure. The purpose is to provide a structural wall utilizing.

The present invention for solving the above problems is a connection structure in which a steel structure and a precast concrete member are connected, and the steel structure is buried in the ground with a part of the steel structure protruding above the ground, and the precast is used. The concrete member is provided with an opening at the lower end so that the protruding portion, which is a portion of the steel structure protruding above the ground, is inserted into the opening of the precast concrete member, and the precast concrete member is made of the steel. It is installed so as to straddle the protruding portion of the structure, and a rod-shaped member is inserted so as to penetrate both the precast concrete member and the steel structure, and a plurality of rod-shaped members are inserted outward from the main reinforcing bar inside the precast concrete member. A restraining member through which the rod-shaped member penetrates is provided, and the voids in the opening of the precast concrete member are filled with mortar or concrete.

Further, the present invention from another viewpoint is a structural wall having the above-mentioned connection structure, in which a plurality of the precast concrete members are arranged along an extension direction of the structural wall, and the precast concrete members are the steel structure. It is characterized in that it is installed so as to straddle the protruding portion.

From yet another point of view, the present invention is a connection method for connecting a steel structure and a precast concrete member, and the steel structure is partially projected above the ground and protrudes above the ground. The first step of installing the precast concrete member so as to be inserted into an opening provided at one end of the precast concrete member so as to straddle the portion of the steel structure protruding above the ground. , A restraining member for connecting a plurality of the rod-shaped members provided outside the main reinforcing bar inside the precast concrete member, the precast concrete member, and the steel structure so as to penetrate the rod-shaped member. It is characterized by having a second step of inserting the rod-shaped member and a third step of filling the voids in the opening of the precast concrete member with mortar or concrete and solidifying the concrete.

According to the present invention, the steel structure in the underground portion and the precast concrete member in the above-ground portion can be firmly connected with excellent work efficiency.

It is a front view which shows the schematic structure of the structural wall which concerns on 1st Embodiment of this invention. FIG. 3 is a sectional view taken along the line AA in FIG. It is an enlarged view of the connection part of the steel structure and the precast concrete member which concerns on 1st Embodiment of this invention. It is a partial cross-sectional view of the structural wall which concerns on 1st Embodiment of this invention, and is the figure for demonstrating the through hole of a steel structure and a precast concrete member. FIG. 2 is a cross-sectional view taken along the line BB in FIG. FIG. 2 is a sectional view taken along the line CC in FIG. It is an enlarged view of the connection part of the steel structure and the precast concrete member which concerns on the 2nd Embodiment of this invention. It is a figure which shows the schematic structure of the structural wall which concerns on the 2nd Embodiment of this invention, and is the figure which corresponds to the CC cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 3rd Embodiment of this invention, and is the figure which corresponds to the BB cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 3rd Embodiment of this invention, and is the figure which corresponds to the CC cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 4th Embodiment of this invention, and is the figure which corresponds to the CC cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 5th Embodiment of this invention, and is the figure which corresponds to the BB cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 5th Embodiment of this invention, and is the figure which corresponds to the CC cross section in FIG. It is a figure which shows the schematic structure of the structural wall which concerns on 6th Embodiment of this invention, and is the figure which corresponds to the BB cross section in FIG. It is an enlarged view of the connecting part of the adjacent restraint member which concerns on 6th Embodiment of this invention. It is a figure which shows the schematic structure of the structural wall which concerns on 6th Embodiment of this invention, and is the figure which corresponds to the CC cross section in FIG. It is a figure which shows an example of the installation method of the precast concrete member which concerns on 7th Embodiment of this invention. It is a figure which shows an example of the installation method of the precast concrete member which concerns on 7th Embodiment of this invention. It is a figure which shows an example of the installation method of the precast concrete member which concerns on 7th Embodiment of this invention. It is a figure which shows an example of the installation method of the precast concrete member which concerns on 7th Embodiment of this invention. It is a figure which shows the shape example of a precast concrete member. It is a figure which shows the shape example of a precast concrete member. It is a figure which shows the shape example of the restraint member. It is a figure which shows the mounting example of the restraint member.

The present invention is a connection structure and connection method between a steel structure installed in the underground portion as a foundation portion and a precast concrete member installed in the above-ground portion. Further, the present invention is a structural wall composed of a steel structure and a precast concrete member having the connecting structure. Applications of this structural wall include, for example, earthworks walls, seawalls, breakwaters or piers.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, the elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<First Embodiment>
In the first embodiment, a steel sheet pile is used as a steel structure constituting the foundation portion of the structural wall. As shown in FIG. 1, the structural wall 1 is installed on a plurality of steel sheet piles 20 arranged in a row along the extension direction L (normal direction) of the structural wall 1 and above the steel sheet piles 20. It is composed of a plurality of precast concrete members 50. The precast concrete member 50 in the present embodiment has a width equivalent to that of two steel sheet piles 20.

As shown in FIGS. 2 and 3, the steel sheet pile 20 is buried in the ground, but a part of the steel sheet pile 20 is in a state of protruding above the ground. At the lower end of the precast concrete member 50, an opening 51 capable of accommodating a portion of the steel sheet pile 20 projecting above the ground (hereinafter, “projecting portion 21”) is provided. The opening 51 is formed so as to penetrate the precast concrete member 50 in the width direction W (FIG. 1), and as shown in FIG. 3, the lower end portion of the precast concrete member 50 sandwiches the opening 51 in between and is the first. The shape is divided into an end portion 52 and a second end portion 53.

The precast concrete member 50 is installed on the upper portion of the steel sheet pile 20 in a state where the protruding portion 21 of the steel sheet pile 20 is located between the first end portion 52 and the second end portion 53. That is, in the side view of the structural wall 1, the protruding portion 21 of the steel sheet pile 20 is inserted into the opening 51 of the precast concrete member 50 so that the precast concrete member 50 straddles the protruding portion 21 of the steel sheet pile 20. It is installed in. The voids in the opening 51 of the precast concrete member 50 are filled with mortar.

FIG. 4 is a partial cross-sectional view of the structural wall 1, and a through hole 56 penetrating the structural wall 1 in the thickness direction t (FIG. 3) is formed at the lower end of the precast concrete member 50. A plurality of through holes 56 are provided along the width direction W of the precast concrete member 50, and three through holes 56 are formed at different heights at the lower end portion of the precast concrete member 50. Further, a through hole 22 penetrating the structural wall 1 in the thickness direction t is also formed in the upper portion of the steel sheet pile 20. In the steel sheet piles 20 arranged along the extension direction L of the structural wall 1, the first steel sheet piles 20a in which the through holes 22 are formed at different heights and the through holes 22 at different heights 2 There are two types of steel sheet piles 20 such as the second steel sheet piles 20b formed one by one, and the first steel sheet piles 20a and the second steel sheet piles 20b are alternately installed along the extension direction L of the structural wall 1. There is. In the precast concrete member 50 installed on the upper part of the steel sheet pile 20, the central through hole 56 coincides with the position of the through hole 22 of the first steel sheet pile 20a, and the left and right through holes 56 are different from each other. They are arranged so as to match the positions of the through holes 22 of the steel sheet pile 20b. That is, the precast concrete member 50 in the present embodiment is arranged so that one precast concrete member 50 is placed on three steel sheet piles 20.

As shown in FIG. 3, at the connection portion between the steel sheet pile 20 and the precast concrete member 50, a rod-shaped member passes through the through hole 22 (FIG. 4) of the steel sheet pile 20 and the through hole 56 (FIG. 4) of the precast concrete member 50. 2 is inserted. The material of the rod-shaped member 2 is not particularly limited as long as it has high strength, and may be resin or metal. For example, PC steel, PC steel rod, reinforcing bar, round steel, high-strength reinforcing bar or steel bolt may be used. Etc. are preferably used.

In the present embodiment, a steel bolt is used as the rod-shaped member 2, but the inserted steel bolt is tightened with a nut, and tension is applied in the longitudinal direction of the rod-shaped member 2. Although it is possible to connect the steel sheet pile 20 and the precast concrete member 50 even if tension is not applied to the rod-shaped member 2, the steel sheet pile 20 can be connected by applying tension to the rod-shaped member 2 as in the present embodiment. And the connection between the precast concrete member 50 and the precast concrete member 50 can be made stronger.

Reinforcing bars are embedded inside the precast concrete member 50, and as shown in FIG. 3, main reinforcing bars pass through the insides of the first end 52 and the second end 53 of the precast concrete member 50, respectively. .. The force distribution reinforcing bars are not shown. In the structural wall 1 of the present embodiment, a restraining member 3 which is a strip-shaped member (for example, a steel material) is provided inside the first end portion 52 and the second end portion 53 of the precast concrete member 50, respectively. The restraining member 3 is provided outside the main reinforcing bar 54 inside the precast concrete member 50. In other words, the main reinforcing bar 54 of the precast concrete member 50 is located between the restraining member 3 and the opening 51. Further, a fixing plate 55 for improving the adhesion between the concrete and the reinforcing bar may be provided at the tip of the main reinforcing bar 54 as in the present embodiment. The fixing plate 55 may be another member such as a nut.

As shown in FIGS. 5 and 6, the restraint member 3 is embedded inside the precast concrete member 50 so that the longitudinal direction faces the width direction W of the precast concrete member 50. The restraint member 3 of the present embodiment has a length slightly shorter than the width of the precast concrete member 50, and one restraint member 3 can cover the three through holes 56 in the width direction W of the precast concrete member 50. It is the length. Similar to the through hole 56 of the precast concrete member 50, the restraint member 3 is formed with a through hole (not shown), and the rod-shaped member 2 is inserted so as to pass through the through hole of the restraint member 3. By providing the restraint member 3 as in the present embodiment, a plurality of rod-shaped members 2 are connected via the restraint member 3, and the connection between the steel sheet pile 20 and the precast concrete member 50 is further strengthened. be able to. Further, since the restraining member 3 is provided outside the main reinforcing bar 54 of the precast concrete member 50, it is possible to suppress deformation of the main reinforcing bar 54 when a load is applied to the precast concrete member 50. ..

Further, as shown in FIG. 6, the steel sheet piles 20 are connected to each other via the joint portion 23, but in the structural wall 1 of the present embodiment, the position of the widthwise end surface 50a of the precast concrete member 50 is the steel sheet pile 20. The precast concrete member 50 is installed so as to be at a position different from the position of the joint portion 23 of the above. That is, the structural wall 1 is constructed so that the joint portions of the adjacent precast concrete members 50 and the joint portions of the adjacent steel sheet piles 20 in the extension direction L of the structural wall 1 are located at different positions from each other. It is not essential to arrange the precast concrete members 50 in this way, but by preventing the joints of the precast concrete members 50 and the joints of the steel sheet pile 20 from overlapping, the displacement of the joints in the event of an earthquake or the like can be prevented. It can be suppressed.

As shown in FIG. 3, the insertion portion of the rod-shaped member 2 of the precast concrete member 50 is provided with a recess 57 having a shape as if it were hollowed out from the outer surface of the precast concrete member 50 in the thickness direction t. The recess 57 is formed in advance at the time of manufacturing the precast concrete member 50. The recess 57 is filled with mortar so that the inserted rod-shaped member 2 does not appear in the appearance. Although the mortar filled in the recess 57 is shown in FIG. 3, the illustration is omitted in the subsequent drawings.

The structural wall 1 of the first embodiment is configured as described above. Next, a method of connecting the steel sheet pile 20 and the precast concrete member 50 will be described.

(First step)
First, a plurality of steel sheet piles 20 are buried in the ground as the foundation of the structural wall 1, and at this time, the steel sheet piles 20 are installed so that a part of them protrudes above the ground. Next, the precast concrete member 50 manufactured in advance at the factory is installed on the upper part of the steel sheet pile 20. Here, the positions of the opening 51 formed at the lower end of the precast concrete member 50 and the protruding portion 21 of the steel sheet pile 20 are aligned, and the protruding portion 21 of the steel sheet pile 20 is covered with the precast concrete member 50 so that the precast concrete is covered with the precast concrete. The member 50 is suspended from the ground surface. As a result, the precast concrete member 50 is installed in such a state that the protruding portion 21 of the steel sheet pile 20 is inserted into the opening 51 of the precast concrete member 50. Further, in the present embodiment, the precast concrete member 50 is installed so that one precast concrete member 50 is placed on the three steel sheet piles 20. When the structural wall 1 is used as a tide embankment, a breakwater, or the like, when the precast concrete member 50 is installed on the seabed, a temporary deadline is set around the steel structure, and the work is performed after the drainage is completed.

(Second step)
Subsequently, the rod-shaped member 2 is inserted so as to pass through the through hole 56 (FIG. 4) of the precast concrete member 50 and the through hole 22 (FIG. 4) of the steel sheet pile 20. In the present embodiment, a steel bolt is inserted and a nut is tightened to apply tension in the longitudinal direction of the rod-shaped member 2. As a result, the steel sheet pile 20 and the precast concrete member 50 can be more firmly connected. The through hole 56 of the precast concrete member 50 may be formed in advance at the time of manufacturing the precast concrete member 50, or may be formed by processing the precast concrete member 50 after manufacturing.

(Third step)
After that, the void in the opening 51 of the precast concrete member 50 is filled with mortar through a mortar injection hole (not shown) provided in the precast concrete member 50. Then, the filled mortar solidifies to connect the steel sheet pile 20 and the precast concrete member 50. At this time, in the present embodiment, the protruding portion 21 of the steel sheet pile 20 is located between the first end portion 52 and the second end portion 53 of the precast concrete member 50, and the steel sheet pile 20 and the precast concrete member 50 are located. Because they are in an overlapping state, they are more firmly connected. In particular, when the structural wall 1 is used near the coast such as a seawall, a large rotational moment is received from the sea side to the land side when a tsunami or the like occurs, so the steel sheet pile 20 and the precast concrete member 50 It is useful to connect with and on top of each other.

If the steel sheet pile 20 and the precast concrete member 50 are connected by the above method, the protruding portion 21 of the steel sheet pile 20 will be covered with the precast concrete member 50. Therefore, in the structural wall 1 having this connection structure, the protruding portion 21 of the steel sheet pile 20 does not appear in the appearance, so that the anticorrosion treatment of the steel sheet pile 20 at the time of construction can be omitted. This makes it possible to shorten the construction period.

Further, in this connection structure, since the mortar is filled with the rod-shaped member 2 inserted between the steel sheet pile 20 and the precast concrete member 50, the rod-shaped member 2 has a pull-out resistance force or a pull-out resistance force in the event of an earthquake or the like. Push-in resistance can be generated. In addition, by inserting the rod-shaped member 2, a frictional force can be generated between the steel sheet pile 20 and the precast concrete member 50. That is, according to the connection structure of the present embodiment, it is possible to increase the rigidity of the structural wall 1 by the action of those forces. Further, in the present embodiment, since each precast concrete member 50 is arranged so that one precast concrete member 50 is connected to a plurality of steel sheet piles 20, the rigidity of the structural wall 1 can be further improved. ..

Further, since the restraining member 3 through which the plurality of rod-shaped members 2 penetrate is provided outside the main reinforcing bar 54 of the precast concrete member 50, the main reinforcing bar 54 is deformed when a load is applied to the precast concrete member 50. It is also possible to suppress.

Further, in the present embodiment, since the joint portions of the adjacent precast concrete members 50 and the joint portions of the adjacent steel sheet piles 20 are connected so as not to overlap with each other, the joint portions of the steel sheet pile 20 in the event of an earthquake or the like are connected. It is possible to suppress the deviation and the deviation of the joint portion of the precast concrete member 50. In the case of such a connection structure, when bending, shearing or axial force is applied at the connection portion between the steel sheet pile 20 and the precast concrete member 50, the force received by the precast concrete member 50 is transmitted to each steel sheet pile 20. Since the force received by the steel sheet pile 20 is transmitted to each precast concrete member 50, the rigidity of the structural wall 1 can be increased. Further, in the case of this connection structure, the resistance to a load from the vertical direction can be increased.

The structural wall 1 of the present embodiment is constructed by repeating the above first to third steps. After the completion of the third step, the recess 57 on the outer surface of the precast concrete member 50 corresponding to the insertion point of the rod-shaped member 2 is filled with mortar.

Regarding the method of connecting the steel sheet pile 20 and the precast concrete member 50, in the present embodiment, tension is applied to the rod-shaped member 2 in the second step, but tension is applied to the rod-shaped member 2 in the third step instead of the second step. May be given. In this case, for example, when a steel bolt is used as the rod-shaped member 2, by covering the steel bolt with a resin or the like in advance, slippage easily occurs between the steel bolt and the solidified mortar, and the steel bolt can be used. Can be rotated. However, if mortar is injected without applying tension to the rod-shaped member 2, the rod-shaped member 2 may bend. Therefore, in order to connect the steel sheet pile 20 and the precast concrete member 50 more firmly, the second step. It is preferable to apply tension to the rod-shaped member 2.

<Second embodiment>
In the second embodiment, the shape of the restraint member 3 is different from that of the first embodiment. As shown in FIG. 7, the upper end portion and the lower end portion of the restraint member 3 of the second embodiment are formed with flange portions 3a protruding inward of the precast concrete member 50, that is, toward the opening 51. As shown in FIG. 8, through holes 3b are formed in the flange portion 3a of the restraint member 3 at intervals along the longitudinal direction of the restraint member 3. The main reinforcing bar 54 of the precast concrete member 50 passes through each through hole 3b.

In the structural wall 1 of the second embodiment as described above, since the main reinforcing bar 54 passes through the flange portion 3a of the restraining member 3, the adhesion between the concrete and the reinforcing bar can be enhanced through the restraining member 3. .. In addition to this, the binding force of the plurality of main reinforcing bars 54 can be increased, and the deformation suppressing effect of the main reinforcing bars 54 when a load is applied to the precast concrete member 50 can be enhanced. That is, in the structural wall 1 of the second embodiment, the rod-shaped member 2, the restraining member 3, and the main reinforcing bar 54 are connected to each other, and the synergistic effect of the combination of the three causes the steel structure and the precast concrete member to be connected to each other. The connection can be made even stronger. The number and position of the flange portions 3a provided on the restraint member 3 are not particularly limited. For example, the flange portion 3a may be provided at either the upper end portion or the lower end portion of the restraint member 3, or the flange portion 3a is provided at the center portion of the restraint member 3 as long as it does not interfere with the rod-shaped member 2. May be.

<Third embodiment>
In the third embodiment, the steel pipe sheet pile 30 is used as the steel structure. As shown in FIGS. 9 and 10, a plurality of steel pipe sheet piles 30 are arranged along the extension direction L of the structural wall 1, and each steel pipe sheet pile 30 is connected via a joint portion 31 as shown in FIG. .. In the third embodiment, three steel pipe sheet piles 30 are connected to one precast concrete member 50. Further, the precast concrete members 50 are arranged so that the end face 50a in the width direction does not overlap with the position of the joint portion 31 of the steel pipe sheet pile 30. This makes it possible to suppress the occurrence of displacement of the joint portions of the adjacent precast concrete members 50.

Even when the steel pipe sheet pile 30 is used as the steel structure as in the third embodiment, the precast concrete member 50 is installed so as to straddle the portion of the steel pipe sheet pile 30 protruding above the ground, thereby performing the first embodiment. Similarly, when constructing the structural wall 1, the steel structure and the precast concrete member 50 can be connected more firmly.

<Fourth Embodiment>
In the fourth embodiment, a structure in which a steel pipe pile 40 and a steel sheet pile 20 are combined is used as a steel structure. As shown in FIG. 11, a plurality of steel sheet piles 20 are arranged along the extension direction L of the structural wall 1 as in the first embodiment, and each steel sheet pile 20 is connected via a joint portion 23. Further, a plurality of steel pipe piles 40 are installed at intervals along the extension direction L of the structural wall 1. The steel pipe pile 40 is installed adjacent to the steel sheet pile 20 so that a part of the curved surface portion thereof enters the recess 24 (the portion surrounded by the web and the flange) of the steel sheet pile 20 in a plan view. The steel pipe pile 40 and the steel sheet pile 20 are connected by being bound by, for example, a restraint.

In the structural wall 1 of the fourth embodiment, of the three rod-shaped members 2 inserted into one precast concrete member 50, the rod-shaped members 2 on both sides penetrate both the steel pipe pile 40 and the steel sheet pile 20, respectively. The rod-shaped member 2 in the center is in a state of penetrating only the steel sheet pile 20. Further, the precast concrete members 50 are arranged so that the end face 50a in the width direction does not overlap with the position of the joint portion 23 of the steel sheet pile 20. This makes it possible to suppress the displacement of the joint portions of the adjacent precast concrete members 50. Further, in the fourth embodiment, the steel pipe pile 40 is installed at the position of the end face 50a in the width direction of the precast concrete member 50, that is, at the position of the joint portion of the adjacent precast concrete members 50. As a result, the effect of the steel pipe pile 40 in suppressing the displacement of the joint portion of the precast concrete member 50 is further improved.

Even when a structure in which a steel pipe pile 40 and a steel sheet pile 20 are combined is used as a steel structure as in the fourth embodiment, the precast concrete member 50 is straddled over a portion of the combined structure protruding above the ground. By installing the structure wall 1, the steel structure and the precast concrete member 50 can be more firmly connected when the structural wall 1 is constructed as in the first embodiment.

<Fifth Embodiment>
In the fifth embodiment, only the steel pipe pile 40 is used as the steel structure portion. As shown in FIGS. 12 and 13, a plurality of steel pipe piles 40 are installed at intervals along the extension direction L of the structural wall 1. In the fifth embodiment, unlike the first embodiment, five rod-shaped members 2 are inserted into one precast concrete member 50. Further, the width of the precast concrete member 50 is longer than the width of the precast concrete member 50 of the first embodiment. In the fifth embodiment, of the five rod-shaped members 2 inserted into one precast concrete member 50, the two rod-shaped members 2 on both sides of the central rod-shaped member 2 penetrate different steel pipe piles 40. ing.

Even when the steel pipe pile 40 is used as the steel structure as in the fifth embodiment, the precast concrete member 50 is installed so as to straddle the portion of the steel pipe pile 40 protruding above the ground, thereby performing the first embodiment. Similarly, when constructing the structural wall 1, the steel structure and the precast concrete member 50 can be connected more firmly.

<Sixth Embodiment>
In the fifth embodiment described above, the steel pipe pile 40 is used as the steel structure, but when the steel pipe pile 40 is not installed at the joint portion of the adjacent precast concrete member 50, the adjacent precast concrete member 50 is connected only by the mortar. Will be done. In the sixth embodiment, the structural wall 1 capable of connecting the adjacent precast concrete members 50 even in such a case will be described.

As shown in FIGS. 14 to 16, the precast concrete member 50 of the sixth embodiment is provided with a notch at the lower end portion, and the width of the lower end portion is shorter than the width of the other portions. In the sixth embodiment, the width of the restraint member 3 embedded in the precast concrete member 50 has the same width as that of the precast concrete member 50, and the end faces of the adjacent restraint members 3 are butted against each other. It has become. In the sixth embodiment, splicing plates 4 are provided at both ends of the restraining member 3 in the width direction. The splicing plates 4 of the adjacent restraint members 3 are fixed to each other by, for example, welding or bolting.

When constructing the structural wall 1 of the sixth embodiment, the precast concrete members 50 are arranged on the upper part of the steel pipe pile 40, and then the splicing plates 4 of the adjacent restraint members 3 are fixed to each other. After that, formwork is constructed on the front side and the back side of the precast concrete member 50, and the voids in the opening 51 of the precast concrete member 50 are filled with mortar. As a result, the structural wall 1 is constructed in a state where the adjacent restraint members 3 are connected to each other via the splicing plate 4 at the joint portions of the adjacent precast concrete members 50. As a result, the connection between the adjacent precast concrete members 50 becomes stronger.

In the sixth embodiment, the adjacent restraint members 3 are connected by using the splicing plate 4, but they may be connected by other methods. Further, even when a steel structure other than the steel pipe pile 40 is used, the connection between the adjacent precast concrete members 50 can be further strengthened by connecting the adjacent restraint members 3 to each other. can.

<Seventh Embodiment>
In the first to sixth embodiments described above, the method of connecting the steel structure and the precast concrete member 50 has been described on the premise that the precast concrete member 50 is lowered to the ground surface, but in the seventh embodiment, the precast concrete is described. An example in which the precast concrete member 50 is lowered onto the receiving surface provided on the steel structure when the member 50 is installed will be described.

For example, as shown in FIG. 17, a flat plate-shaped foundation concrete member 5 may be provided near the ground surface of the steel structure, and the precast concrete member 50 may be lowered onto the foundation concrete member 5. At this time, it is preferable to provide a spacer 6 having a predetermined height on the upper surface of the foundation concrete member 5. When installing a steel structure, the installation height may vary between adjacent steel structures, but by appropriately providing spacers 6 with different heights, the precast concrete members 50 can be installed at the same height. Can be done. As a result, the landscape as the structural wall 1 can be improved. Further, if the installation height of the precast concrete member 50 can be adjusted, fine adjustment can be made so that the positions of the through holes of the steel structure and the through holes 56 of the precast concrete member 50 can be matched. A packing 7 is provided between the foundation concrete member 5 and the precast concrete member 50 so that the mortar to be filled later does not leak.

In the example shown in FIG. 17 above, a plurality of spacers 6 having different heights are provided as a gap adjusting mechanism between the precast concrete member 50 and the receiving surface of the steel structure in contact with the bottom surface of the precast concrete member 50. However, the gap adjusting mechanism is not limited to using the spacer 6. For example, as shown in FIG. 18, a height adjusting bolt 8 may be provided at the lower end of the precast concrete member 50. In the example shown in FIG. 18, the installation height of the precast concrete member 50 can be adjusted by adjusting the height of the bolt protruding from the lower end surface of the precast concrete member 50.

Further, when the precast concrete member 50 is installed at a position away from the ground surface, the bracket 9 may be attached to the steel structure as shown in FIG. In the example shown in FIG. 19, the bottom formwork 10 extending in the width direction W of the precast concrete member 50 is installed on the upper surface of the bracket 9, and the installation height of the precast concrete member 50 is set by the spacer 6 as in the example shown in FIG. Adjust. The bracket 9 after the installation of the precast concrete member 50 may be filled with soil so that the ground surface at the installation location of the structural wall 1 is at the same height as the surrounding ground surface, or is removed by gas cutting. May be. Further, as shown in FIG. 20, a height adjusting bolt 8 as in the example shown in FIG. 18 may be provided as the gap adjusting mechanism.

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

For example, the shape and installation position of the steel structure are not limited to those described in the above-described embodiment. Similarly, the shape of the precast concrete member 50 is not limited to that described in the above-described embodiment. For example, as shown in FIG. 21, the shape may be asymmetrical in side view, or the shape may be low as shown in FIG. 22. That is, the shape of the precast concrete member 50 is appropriately changed depending on the use of the structural wall 1. Further, the shape of the opening 51 of the precast concrete member 50 is appropriately changed depending on the shape of the steel structure to be used, the installation position, and the like.

Further, in the above-described embodiment, two restraining members 3 are provided for one precast concrete member 50 according to the insertion position of the rod-shaped member 2, but one restraining member is provided, for example, as shown in FIG. 23. 3 may be used to connect all the rod-shaped members 2. Further, such a flat plate-shaped restraining member 3 and the strip-shaped restraining member 3 of the above-described embodiment may be used in combination. When constructing the structural wall 1, the recess 57 of the precast concrete member 50 corresponding to the insertion point of the rod-shaped member 2 is filled with mortar, so that the size of the restraining member 3 is not too large from this viewpoint. Is preferable.

Further, in the above-described embodiment, the precast concrete member 50 is manufactured in a state where the restraining member 3 is embedded inside. For example, after the precast concrete member 50 is installed, the precast concrete member 50 is formed in a recess 57 on the outer surface of the precast concrete member 50. The restraining member 3 may be attached. In this case, after the restraint member 3 is attached to the recess 57, the rod-shaped member 2 is inserted so as to pass through the restraint member 3, the precast concrete member 50, and the steel structure. When the restraint member 3 is attached later as described above, the restraint member 3 may be attached so as to be hung over the adjacent precast concrete members 50 as shown in FIG. 24, for example. As a result, the connection between the adjacent precast concrete members 50 becomes stronger, and the displacement of the joint portion of the precast concrete members 50 can be further suppressed. Even when the restraint member 3 is attached later, the recess 57 on the outer surface of the precast concrete member 50 is filled with mortar, so that the landscape as the structural wall 1 is not impaired.

In the above description, the voids in the opening 51 of the precast concrete member 50 and the recesses 57 on the outer surface of the precast concrete member 50 are filled with mortar, but concrete may be filled instead of the mortar. ..

The present invention can be used, for example, for earthworks walls, seawalls, breakwaters, piers, and the like.

1 Structural wall 2 Rod-shaped member 3 Restraining member 3a Flanking member 3b Through hole in flange 4 Splicing plate 5 Foundation concrete member 6 Spacer 7 Packing 8 Height adjustment bolt 9 Bracket 10 Bottom form 20 Steel sheet pile 20a No. 1 steel sheet pile 20b 2nd steel sheet pile 21 Projection part of steel structure 22 Through hole of steel sheet pile 23 Joint part of steel sheet pile 24 Recession of steel sheet pile 30 Steel pipe sheet pile 31 Joint part of steel pipe sheet pile 50 Steel pipe pile 50 Precast concrete member 50a Widthwise end face of precast concrete member 51 Opening of precast concrete member 52 First end of precast concrete member 53 Second end of precast concrete member 54 Main reinforcement 55 Fixing plate 56 Through hole of precast concrete member 57 Precast Recessed concrete member L Extension direction of structural wall t Thickness direction of structural wall W Width direction of precast concrete member

Claims (15)

It is a connection structure in which a steel structure and a precast concrete member are connected.
The steel structure is buried in the ground with a part protruding above the ground.
The precast concrete member has an opening at the lower end and has an opening.
The precast concrete member is installed so as to straddle the protruding portion of the steel structure so that the protruding portion, which is a portion of the steel structure protruding above the ground, is inserted into the opening of the precast concrete member. ,
A rod-shaped member is inserted so as to penetrate both the precast concrete member and the steel structure.
A restraining member through which the plurality of rod-shaped members penetrate is provided outside the main reinforcing bar inside the precast concrete member.
A connection structure between a steel structure and a precast concrete member, wherein the voids in the opening of the precast concrete member are filled with mortar or concrete. A flange portion is formed on the restraining member so as to project inward from the precast concrete member.
The connection structure according to claim 1, wherein the main reinforcing bar of the precast concrete member penetrates the flange portion. The connection structure according to claim 1 or 2, wherein tension is applied in the longitudinal direction of the rod-shaped member. A structural wall having the connection structure according to any one of claims 1 to 3.
A structural wall, wherein a plurality of the precast concrete members are arranged along an extension direction of the structural wall, and the precast concrete members are installed so as to straddle the protrusions of the steel structure. The structural wall according to claim 4, wherein the steel structure is composed of a plurality of steel sheet piles connected to each other via a joint portion. The structural wall according to claim 4, wherein the steel structure is composed of a plurality of steel pipe piles connected to each other via a joint portion. The steel structure is
With multiple steel sheet piles connected to each other via joints,
The structural wall according to claim 4, wherein the structural wall is composed of a plurality of steel pipe piles adjacent to each other so as to enter the recess of the steel sheet pile in a plan view. The precast concrete member is arranged so that the position of the end face in the width direction of the precast concrete member and the position of the joint portion of the steel structure do not overlap with each other in the extension direction of the structural wall. The structural wall according to any one of 5 to 7. The structural wall according to claim 4, wherein the steel structure is composed of a plurality of steel pipe piles installed at intervals. The structural wall according to any one of claims 4 to 9, wherein adjacent restraining members are connected to each other. It is a connection method for connecting a steel structure and a precast concrete member.
The precast is such that a portion of the steel structure buried in the ground in a state of protruding above the ground is inserted into an opening provided at one end of the precast concrete member. The first step of installing the concrete member so as to straddle the portion of the steel structure protruding above the ground,
The rod-shaped member is used, and the restraining member for connecting a plurality of the rod-shaped members provided outside the main reinforcing bar inside the precast concrete member, the precast concrete member, and the steel structure so as to penetrate the said. The second step of inserting the rod-shaped member and
A method for connecting a steel structure and a precast concrete member, which comprises a third step of filling the voids in the opening of the precast concrete member with mortar or concrete and solidifying the mixture. A flange portion is formed on the restraining member so as to project inward from the precast concrete member.
The connection method according to claim 11, wherein the main reinforcing bar of the precast concrete member penetrates the flange portion. In the first step, the precast concrete member is received by a receiving surface provided on the steel structure, and the installation height of the precast concrete member is provided by a gap adjusting mechanism provided between the receiving surface and the precast concrete member. The connection method according to claim 11 or 12, wherein the connection method is adjusted. The connection method according to any one of claims 11 to 13, wherein in the second step, tension is applied in the longitudinal direction of the rod-shaped member after the rod-shaped member is inserted. The connection method according to any one of claims 11 to 13, wherein in the third step, tension is applied in the longitudinal direction of the rod-shaped member after the mortar or the concrete is solidified.

Images