JP3000445B2 - Connection structure of frame members in PC hollow pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for joining a frame member such as a beam or a floor slab to a PC hollow pile wall in which prestressed concrete (hereinafter, referred to as "PC") hollow piles are arranged in a column type. .

[0002]

2. Description of the Related Art In recent years, when constructing an underground structure, a PC hollow pile wall in which PC hollow piles as shown in FIG. 5 are arranged in a column array has been used as a retaining wall. Here, the PC hollow pile 10 has a hollow portion 10a, and is usually installed by a middle moat construction method in which an auger screw is inserted and excavated / discharged, so that workability is good. Also, the PC hollow pile 10 is a factory-produced product in which a PC steel material 10b is preliminarily arranged and prestressed thereby, and therefore has high bending rigidity and excellent quality.

[0003] On the other hand, there have been conventionally disclosed many techniques for utilizing a temporary retaining wall as it is as a structure of an underground structure. In this case, a joint between the retaining wall and a structural member such as a beam or a floor slab is disclosed. For example, a concrete portion of a reinforced concrete retaining wall is scraped off to expose an internal reinforcing bar 10c and the like, and a reinforcing bar or a steel frame of a structural member is welded thereto.

[0004]

Therefore, by combining the above two technologies, the PC hollow pile wall in which the PC hollow piles 10 are arranged in a columnar manner can be used not only as a temporary retaining wall but also as an underground structure as it is. If it can be used as a structure, there are many advantages in the construction of underground structures.
Has a hollow portion 10a as described above, has a small thickness, and cannot peel off a concrete portion. Therefore, the frame member cannot be joined to the PC hollow pile wall, and the PC hollow pile The PC hollow pile wall in which the 10s were arranged in a column arrangement could not be used not only as a temporary retaining wall but also as a structure of an underground structure.

[0005] Therefore, the present invention provides a joint structure in which a frame member is joined to a PC hollow pile wall in which PC hollow piles are arranged in a columnar manner, so that the PC hollow pile wall can only be used as a temporary retaining wall. It is intended to be able to be used as it is as a structure of an underground structure as it is, to improve workability and shorten the construction period.

[0006]

That is, the invention according to claim 1 is characterized in that an end of a frame member is fixed to a plate attached to a side surface of a PC hollow pile. It is a joining structure of the frame material in FIG.

[0007] According to this structure, the frame member can be joined to the side surface of the PC hollow pile without removing it, and the PC hollow pile is arranged in a column in the construction of the underground structure. The hollow pile wall can be used not only as a temporary retaining wall but also as an underground structure as it is.

According to a second aspect of the present invention, in the first aspect of the present invention, the PC hollow pile reinforces a joint portion with a structural member, and connects the reinforcement with the plate. PC having an anchor bar
It is a joining structure of a structural member in a hollow pile.

According to this structure, the plate is made of P
It is firmly fixed to the C hollow pile, and a reliable and strong joint can be formed. Further, since a rigid contact can be formed, an economical structural design can be performed.

According to a third aspect of the present invention, in the second aspect of the present invention, the reinforcing bar is provided at a predetermined position around a hollow portion of the PC hollow pile in a longitudinal direction at a predetermined length. When,
And an annular muscle arranged at predetermined intervals around the hollow portion by bundling these vertical streaks.The anchor muscle was bent in a substantially U-shape, and both ends were welded and fixed to the plate. A U-shaped streak, and an L-shaped streak bent at a substantially L-shape and having one end welded and fixed to the plate, wherein at least the outermost two U-shaped staves bundle the annular streaks and are L-shaped. The other end of the bar is engaged with at least the outermost U-shaped bar, which is a joint structure of a frame member in a PC hollow pile.

[0011] According to this structure, the PC steel materials arranged in the axial direction of the PC hollow pile and the straps arranged perpendicular to the axial direction of the PC hollow pile so as to bundle these PC steel materials. The reinforcing bars and the anchor bars can be arranged inside the PC hollow pile without conflicting with the like.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the frame member is connected to a PC via a joining means formed on the plate.
This is a joint structure of a frame member in a PC hollow pile fixed to the hollow pile.

As described above, if the joining means is formed on the plate, a strong joining structure between the frame member and the PC hollow pile can be formed. In addition, since the joining operation can be performed in a state in which the frame member is temporarily received by the joining means, the positioning when joining the frame member to the PC hollow pile can be performed easily and accurately. ,
Workability is remarkably improved.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the plate is covered with concrete constituting a structural member. It is a joining structure of a frame material in a PC hollow pile.

According to this structure, for example, even when a steel plate is used as a plate and the steel plate is large, the steel plate is covered by the frame member, and the steel plate does not rust. Can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. In addition, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

1. Configuration FIG. 1 is a longitudinal sectional view showing an embodiment of a joint structure of a frame member in a PC hollow pile according to the present invention (for convenience of illustration, concrete portions are indicated by chain lines), and FIG. FIGS. 2A to 2C are cross-sectional views taken along arrows in FIG. Here, the frame member 30 is fixed to the side surface of the PC hollow pile 10 via the steel plate 20 serving as a plate. Specifically, a reinforcing bar 31 as a constituent element of the frame member 30 is welded and fixed to a steel plate 20 via a steel plate 21 as a joining means, and the steel plate 2
Numeral 0 is fixed to the anchor bar 12 inside the PC hollow pile 10, and the anchor bar 12 is engaged with the reinforcing bar 11 inside the PC hollow pile 10. Hereinafter, each of these elements will be described in detail.

(1) PC Hollow Pile 10 The PC hollow pile 10 has a hollow portion 10 as shown in FIG.
This is a PC product having a, which has high bending strength and little variation in quality. And inside it, PC in the axial direction
A steel material 10b is provided, and a strip 10c is provided orthogonal to the axial direction so as to bundle these PC steel materials 10b. In the present invention, as shown in FIG. 1 and FIG. 2, reinforcing bars 11 and anchor bars 12 described below are arranged while avoiding the PC steel material 10b and the band bars 10c.

Reinforcing bar 11 The reinforcing bar 11 is composed of a vertical bar 11a and an annular bar 11b, and serves to structurally reinforce the joint between the PC hollow pile 10 and the structural member 30.

A) Vertical Bar 11a Two vertical bars 11a are provided around the hollow portion 10a of the PC hollow pile 10, and the length thereof is substantially equal to the length of the steel plate 20 described later. The streak 11a mainly plays a role of resisting a bending moment acting on the joint of the PC hollow pile 10. In addition, the vertical streaks 11a
The diameter, length, number, position, and the like of are determined as appropriate by structural calculations.

B) Annular bar 11b The annular bar 11b is an annular bar arranged around the hollow portion 10a of the PC hollow pile 10 at an appropriate interval. It may be of the form. The annular streaks 11b mainly play a role of resisting a shear force acting on the joint portion of the PC hollow pile 10.
It is also necessary to prevent buckling of the vertical streaks 11a and the accompanying protrusion of concrete. Note that the diameter, interval, and the like of the annular muscle 11b are appropriately determined by structural calculation.

The anchor bar 12 is composed of a U-shaped bar 12a and an L-shaped bar 12b. The anchor bar 12 is for fixing the steel plate 20 to the PC hollow pile 10, and is engaged with the reinforcing bar 11.

A) U-shaped Reinforcement 12a The U-shaped Reinforcement 12a is bent in a substantially U-shape, and both ends thereof are fixed to the back surface of the steel plate 20 by welding. And
In particular, two of the outer sides of these U-shaped streaks 12a are:
It is arranged on both outer sides of the annular muscle 11b. The remaining U-shaped bars 12a excluding the two outer wires are arranged in a shape that bundles the annular bars 11b. In this manner, the U-shaped reinforcement 12a plays a central role in firmly fixing the steel plate 20 to the PC hollow pile 10, and therefore, as described above, the remaining U-shaped reinforcement 1 except for at least two on both outer sides.
2a is to be engaged with the reinforcing bar 11. The diameter, shape, interval, and the like of the U-shaped streaks 12a are appropriately determined by structural calculation.

B) L-shaped Reinforcement 12b The L-shaped Reinforcement 12b is a substantially L-shaped rebar with one end bent in a hook shape, and the hook is hooked on the vertical portion of the outermost two U-shaped reinforcements 12a. The other end is welded and fixed to the back surface of the steel plate 20. The L-shaped streak 12b is connected to the hollow portion 1 of the PC hollow pile 10.
The annular muscles 11b are alternately arranged around the circumference of the annular muscle 11b at appropriate intervals, specifically, at the same intervals as the annular muscles 11b. Thus, the L-shaped reinforcement 12b plays a role of firmly fixing the steel plate 20 to the PC hollow pile 10.

Others The reinforcing bars 11 and anchor bars 12 described above are designed based on structural calculations, and are not limited to the present embodiment. Further, the reinforcing bars 11 and the anchor bars 12 are not essential components of the present invention, and
Other means may be used as long as they can be firmly fixed to the side surface of the hollow pile 10.

(2) Steel Plate 20 The plate steel plate 20 is firmly fixed to the side surface of the PC hollow pile 10, and the reinforcing steel 31 which is a component of the frame member 30.
Is a fixed object. Further, a steel plate 21 serving as a joining means is fixed by welding at a predetermined position.

Steel plate 20 The size and shape of the steel plate 20 are determined by structural design in consideration of the cross-sectional shape of the frame member 30 and the fitting of the reinforcing bars 11 and the anchor bars 12. Further, as described above, the anchor bar 12 is fixed to the back surface by welding.

Steel Plate 21 The steel plate 21 is formed by butt welding which is resistant to tensile stress.
0, and the frame member 30
Is flared. The role of the steel plate 21 is to transmit the stress acting between the PC hollow pile 10 and the structural member 30, and to form a rigid joint structure between the PC hollow pile 10 and the structural member 30 in combination with the steel plate 20. When joining the frame member 30 to the PC hollow pile 10, the welding operation can be performed while the frame member 30 is temporarily received by the steel plate 21, so that the joining operation can be performed accurately and easily. It is. Therefore, the shape and the like of the steel plate 21 are appropriately determined by structural calculation according to the required tensile force of the reinforcing bar 31 and the like, and it is necessary to consider the workability of joining such as welding.

(3) Frame 30 The frame 30 includes beams, floor slabs and the like, and is a member mainly composed of a reinforcing bar or a steel frame. Here, the frame material 30
The reinforcing bar 31 is fixed to the steel plate 21 by welding. A haunch 32 is formed above and below the end of the frame member 30 so as to cover the steel plate 20, and serves to prevent rust of the steel plate 20.

(4) Others An embodiment of the present invention has been described with reference to FIGS. 1 and 2. FIG. 1 shows an embodiment of a joint structure with an upper frame of an underground structure. It represents. In addition, FIG. 3 illustrates an embodiment of a joint structure with a middle frame member of the underground structure, and FIG. 4 illustrates an embodiment of a joint structure with a lower frame member of the underground structure. As described above, in the present invention, it is possible to cope with the fitting of the joining portion which is variously changed depending on the thickness or the thickness of the frame member.

2. Construction procedure The construction procedure of the joint structure of the frame members in the PC hollow pile according to the present invention is as follows. That is, the PC hollow pile 10 on which the reinforcing bars 11, the anchor bars 12, and the steel plate 20 are disposed in advance at the factory is built. After that, when excavating below the joint with the frame member 30, the steel plate 21 is fixed to the steel plate 20 by welding, the end of the reinforcing bar 31 is temporarily received by the steel plate 21, and the reinforcing bar 31 is fixed to the steel plate 21 by welding. Thereafter, if necessary, reinforcing members are arranged around the reinforcing bars 31 and concrete is cast to form the frame members 30. However, the mounting of the steel plate 20 may be performed before the steel plate 21 is welded and fixed, not at the time of manufacturing the PC hollow pile 10, and the mounting of the steel plate 21 is performed at the time of manufacturing the PC hollow pile 10. Is also good.

[0032]

As described above, according to the first aspect of the present invention, it becomes possible to join a frame member to the side surface of a PC hollow pile without removing it, and to construct an underground structure. The PC hollow pile wall, in which PC hollow piles are arranged in a row, can be used not only as a temporary retaining wall but also as a structure of an underground structure as it is, so it is possible to improve workability and shorten the construction period. become able to.

Further, according to the second aspect of the present invention, the plate is firmly fixed to the PC hollow pile, and a reliable and strong joint can be formed. Further, since a rigid contact can be formed, an economical structural design can be performed.

According to the third aspect of the present invention, the PC steel materials arranged in the axial direction of the PC hollow pile and the PC steel materials arranged in a direction orthogonal to the axial direction of the PC hollow pile so as to bundle these PC steel materials. Reinforcing bars and anchor bars can be provided inside the PC hollow pile without conflicting with the stirrups or the like.

According to the fourth aspect of the invention, it is possible to form a strong joining structure between the frame member and the PC hollow pile, and to easily and accurately position the frame member in the PC hollow pile. Can do it,
Workability is remarkably improved.

According to the invention described in claim 5, for example,
Even when a steel plate is used as a plate and the steel plate is large, the steel plate is covered by the frame member, and the steel plate can be prevented from rusting.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a joint structure of a frame member in a PC hollow pile according to the present invention.

FIGS. 2A and 2B are cross-sectional views taken along arrows in FIG. 1, wherein FIG. 2A shows an AA section, FIG. 2B shows a BB section, and FIG. 2C shows a CC section.

FIG. 3 is a longitudinal sectional view showing another embodiment of the joining structure of the frame members in the PC hollow pile according to the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the joining structure of the frame members in the PC hollow pile according to the present invention.

FIG. 5 is a cross-sectional view of a PC hollow pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... PC hollow pile 10a ... Hollow part 10b ... PC steel material 10c ... Strip bar 11 ... Reinforcing bar 11a ... Vertical bar 11b ... Ring bar 12 ... Anchor bar 12a ... C-shaped bar 12b ... L-shaped bar 20 ... Steel plate (plate) 21 ... steel plate (joining means) 30 ... structural member 31 ... rebar 32 ... haunch

Continued on the front page (72) Inventor Masahiro Nakamura 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Toshihiko Kobayashi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Within Construction Co., Ltd. (72) Inventor Yoji Tateishi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Hitoshi Nagato 8th floor, Harmony Tower 1-32-2 Honcho, Nakano-ku, Tokyo Oriental Construction Co., Ltd. In-house (72) Inventor Ryoji Omi 1-32-2 Honmachi, Nakano-ku, Tokyo Harmony Tower 8F Oriental Construction Co., Ltd. In-house (72) Inventor Masaaki Kaizu 1-3-2, Honcho, Nakano-ku, Tokyo Harmony Tower 8F Oriental Construction Co., Ltd. In-house (72) Inventor Akira Oshima 1-8-27 Konan, Minato-ku, Tokyo Nisshin Building Nippon Concrete Industry Co., Ltd. (72) Inventor Isamu Urushihata 1-8 Konan, Minato-ku, Tokyo −27 Nissin Building Nippon Concrete Industry Co., Ltd. (56) Reference Patent flat 2-16211 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) E02D 27/12 E02D 5/18 102 E02D 5/20 102

Claims (5)

(57) [Claims] 1. A joint structure for a structural member in a PC hollow pile, wherein an end of the structural member is fixed to a plate attached to a side surface of the PC hollow pile. 2. The PC hollow pile according to claim 1, further comprising a reinforcing bar for reinforcing a joint with the structural member, and an anchor bar for connecting the reinforcing bar to the plate. Connection structure of frame material in PC hollow pile. 3. The reinforcing bar according to claim 1, wherein the reinforcing bar comprises a vertical reinforcing bar having a predetermined length disposed in a predetermined position around a hollow portion of the PC hollow pile.
And an annular muscle arranged at predetermined intervals around the hollow portion by bundling these vertical streaks. The anchor muscle is bent in a substantially U-shape, and both ends are welded and fixed to the plate. U-shaped streaks and approximately L
An L-shaped streak that is bent into a U-shape and one end of which is welded and fixed to the plate. At least the outermost U-shaped streaks except the outer two bundle the annular streaks, and the other end of the L-shaped streaks is at least 3. The joint structure of a frame member in a PC hollow pile according to claim 2, wherein the frame member is engaged with an outer U-shaped bar. 4. The PC according to claim 1, wherein the frame member is fixed to the PC hollow pile via a joining means formed on the plate. Connection structure of structural members in hollow piles. 5. The joint structure of a PC hollow pile according to claim 1, wherein the plate is covered with concrete constituting the frame. .