JP4757047B2 - Connection method and structure of pile and column member using frame and frame - Google Patents

Description

  The present invention relates to a connecting method and a structure of a pile and a column member using the frame and the frame.

  In the reinforced concrete structure, it is necessary to connect the piles and columns provided in the ground. Therefore, there is a problem that it takes time for bar arrangement work and it is difficult to place concrete.

  In particular, when the cross-sectional area and cross-sectional shape of the beam and the column are different, or when the number of reinforcing bars for the beam and the column is different, the reinforcing bars are likely to be complicated, and it takes time for the bar arrangement work.

Therefore, there is a method for simplifying the bar arrangement work using a reinforcing bar that can be widened, and the following is known (Patent Document 1).
JP-A-6-108476

  However, in such a method, the bending work of the reinforcing bar becomes complicated, and it is impossible to use the joint structure of the reinforcing bar rod in the section to be widened because it is complicated in construction. Therefore, it was practically impossible to use a pile using a reinforcing bar to change the cross section under a low head and narrow construction condition.

  The present invention has been made in view of such problems, and the purpose thereof is to use a housing and a housing that can transmit the cross-sectional force reliably even under low-heading and narrow construction conditions and are easy to construct. It is in providing the connection method and structure of a pile and a column member.

In order to achieve the above-mentioned object, the first invention includes a circular or polygonal band reinforcing bar, and a strand disposed inside or outside the band reinforcing bar and rotatably coupled to the band reinforcing bar. A pile and a pillar using a frame , wherein the length of the strand can be reduced by spiraling the strand, and the axial sectional area and / or the sectional shape gradually changes. A method for connecting members, wherein a step (a) of excavating the ground and providing an excavation hole, and inserting the skeleton in a reduced length by spiraling the strand into the excavation hole The step (b), the step (c) of extending the length by making the strand straight, and placing the strand in the excavation hole, and placing the concrete in the excavation hole to construct a pile Step (d) and building a column member on the pile A step (e), a step (f) of connecting a connecting means to the housing, a step (g) of connecting a reinforcing bar to the connecting means, and placing the pillar member around the reinforcing bar by placing concrete. And a method for connecting the pile and the column member.

  The connecting means may be a different diameter coupler that connects the strand and the reinforcing bar integrally. The different diameter coupler may be provided with a fixing plate for adjusting a difference in axial force between the strand and the reinforcing bar. The excavation hole may be stepped.

The second invention is a connection structure constructed using the first invention.

A third invention has a circular or polygonal band reinforcing bar, and a strand disposed inside or outside the band reinforcing bar and rotatably coupled to the band reinforcing bar, and spiraling the strand The length can be reduced by making it into a shape, and the axial cross-sectional shape gradually changes.

  According to the present invention, it is possible to reliably transmit a cross-sectional force even under a low-headed and narrow construction condition, and to provide an easy-to-construct frame and a method for connecting a pile and a column member using the frame, and a structure. Can do.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a diagram showing a housing 1 used in the first embodiment. FIG. 1A is a side view, and FIG. 1B is a view in which the housing 1 is contracted in FIG. It is a figure which shows a state.
In addition, 1st Embodiment is a connection method of a pile and a reinforced concrete pillar, and uses the frame 1 which can be expanded-contracted as a reinforcement of a pile.

  As shown in FIG. 1A, the housing 1 has a cylindrical shape, and is composed of a strand 3 that is an axial rebar and a ring-shaped rebar 5 that is disposed so as to surround the plurality of strands 3. A circular shape is used for the band reinforcement 5.

Moreover, the area comprised from the plane of the band reinforcement 5 is changing gradually. That is, the cross-sectional shape of the housing 1 is gradually expanded.
The strand 3 and the band reinforcing bar 5 are connected to each other at a crossing point by a coupling jig (not shown), and the strand 3 is rotatable with respect to the band reinforcing bar 5.

The strand 3 is made of a flexible material that does not cause a problem in strength or the like even if the strand 3 is bent to the same degree or more as the diameter of the band reinforcing bar 5.
The strand 3 is made of, for example, a twisted PC fiber, a wire rope, or a combination of fibers such as carbon fiber, glass fiber, and aramid fiber. The band reinforcing bar 5 is a reinforcing bar or the like.

  When the housing 1 is in the state shown in FIG. 1A, the strand 3 and the reinforcing bar 5 intersect each other substantially vertically, but the strand 3 extends in the direction indicated by the arrow A in FIG. Is bent, the strand 3 rotates and the crossing angle with the belt reinforcing bar 5 changes.

Then, at the same time as the strand 3 becomes spiral, the bar spacing of the band reinforcing bars 5 is gradually reduced, and the length of the housing 1 is shortened as shown in FIG.
In this way, by shortening the casing 1, it is possible to construct a reinforcing bar even in a narrow space, and facilitate transportation and storage.

Next, a method for connecting a pile and a pillar using the frame 1 will be described. 2 and FIG. 3 are diagrams showing procedures for constructing and connecting a pile and a pillar using the frame 1, and FIG. 4 is a detailed view and a modification of the connecting portion 15 in FIG.
FIG. 5 is a detailed view showing the connecting portion 21 and the connecting portion 21b of FIG.

First, as shown to Fig.2 (a), the excavation hole 9 is provided in the place where the pile of the ground 7 is constructed.
The excavation hole 9 has a cylindrical shape whose diameter is gradually increased from the underground side to the ground surface side, and the pile is also constructed in this shape. By making a pile into such a shape, collapse of the ground surface layer can be prevented.

  Next, as shown in FIG. 2 (b), the housing 1 is moved in the B direction in a contracted state, and is disposed immediately above the excavation hole 9. In addition, the apartment 11 which is a jig | tool for a connection with a pillar is connected to the upper end of the housing 1.

Next, as shown in FIG. 2 (c), the housing 1 is extended in the C direction and disposed in the excavation hole 9.
As described above, by using the extendable frame 1 using the strand 3, it is easy to construct a reinforcing bar even under a low-headed and narrow construction condition.

Next, as shown in FIG. 3A, concrete 13 is placed in the excavation hole 9 to construct a pile 13b.
Here, as the reinforcing bar of the pile whose diameter is increased like the pile 13b, the frame 1 having a shape whose diameter is gradually enlarged is used. Muscle work is not necessary and workability is improved.

Next, as shown in FIG. 3 (b), the connecting portion 13 is connected to the apartment 11 of the housing 1 in the pile 13 b, and the reinforcing bar 17 serving as the reinforcing bar of the column 17 b is constructed on the connecting portion 13.
As shown in FIG. 4A, the connecting portion 13 is a jig that connects the strand 3 of the housing 1 and the reinforcing bar 17, and has a connecting portion 21 that connects the strand 3 and the reinforcing bar 17. .

  As shown in FIG. 5A, the connecting portion 21 has a different diameter coupler 22, and the different diameter coupler 22 fastens the apartment 11 and the reinforcing bar 17 by a female screw (not shown) provided inside. .

  Further, nuts 23 and 25 are provided at both ends of the different diameter coupler 22, and the nuts 23 and 25 tighten the reinforcing bar 17 and the apartment 11 to prevent the reinforcing bar 17 and the apartment 11 from being detached from the different diameter coupler 22. .

Further, in order to adjust the difference in the axial force between the strand 3 and the reinforcing bar 17, a fixing plate 19 is provided in the different diameter coupler 22. When there is no difference in axial force, the fixing plate 19 is not necessary.
The fixing plate 19 is disposed on the upper side of the different-diameter coupler 22, but may be on the lower side.

  In FIG. 4A, the number of the strands 3 and the reinforcing bars 17 is the same, but when the numbers are different, the connecting portion 15 shown in FIGS. 4A and 5A cannot be used.

In such a case, a connecting portion 15b shown in FIG.
The different diameter coupler 22 is not used for the connecting portion 21b of the connecting portion 15b, and the condominium 11 and the reinforcing bar 17 are provided through the fixing plate 19 as shown in FIG.

Then, when the nuts 25 b, 25 c, 23 b and 23 c sandwich the fixing plate 19, the apartment 11 and the reinforcing bar 17 are fastened to the fixing plate 19.
In this way, the apartment 11 and the reinforcing bar 17 are connected together.

Moreover, since the strand 3 has flexibility, even when the diameters of the frame 1 and the reinforcing bar 17 (column 17b) are different, the connection can be easily made by bending the strand 3 as shown in FIG. Is possible.
By making the strand 3 as close as possible to the strand of the pile and the reinforcing bar of the column as long as the coupler 3 and the nut for fixing the strand 3 do not interfere with each other, the bending generated in the fixing plate is reduced, and the thickness of the fixing plate is shown in FIG. It can be made smaller than in the case of b).

Furthermore, when the cross-sectional shape of the housing 1 and the reinforcing bar 17 is different, as shown in FIG. 4C, the connecting body 15 and the reinforcing bar 17 can be easily attached by using a connecting portion having a shape like the connecting portion 15c. Can be linked.
In addition, the connection part 15c is used when the cross-sectional shape of the housing 1 is circular and the cross-sectional shape of the reinforcing bar 17 (column 17b) is a rectangle.

  Returning to FIG. 3, when the reinforcing bar 17 is constructed, as shown in FIG. 3 (c), concrete is placed around the connecting portion 15 and the reinforcing bar 17, and the column 17b is constructed on the pile 13b.

  In this way, the pillar 17b and the pile 13b are constructed and connected.

Thus, according to this Embodiment, the reinforcing bar which comprises the pile 13b is the extendable frame 1 which used the strand 3, and the cross section of the frame 1 is gradually expanded in diameter.
Therefore, it is easy to construct a reinforcing bar even under a narrow and narrow construction condition, and the connection between the pile 13b and the column 17b is facilitated.
Here, the reinforcing bar 17 of the column 17b has been described as a normal deformed reinforcing bar, but the column may also be a reducible frame having a rebar and a rotatably provided strand, like the pile body.

  Next, a second embodiment will be described. 6A and 6B are diagrams showing a housing 1b according to the second embodiment, in which FIG. 6A is a perspective view, and FIG. 6B is a state in which the housing 1b is contracted in FIG. 6A. FIG.

6C is a modification of FIG. 6A, and FIGS. 6D and 6E are detailed views of the band reinforcing bar 5. FIG.
In addition, the same number is attached | subjected to the element which performs the same function as 1st Embodiment, and description is abbreviate | omitted.

2nd Embodiment is a connection method of a pile and a steel pillar, and in order to connect the steel pillar 31 with a circular cross section and the steel pillar 31 with a rectangular cross section, the cross-sectional shape of the frame 1b which is a reinforcing bar of a pile is It is designed to gradually change from a rectangle to a circle.
Further, the connecting portion 33 is integrated with the steel column 31.

  As shown in FIG. 6 (a), the housing 1b has a shape in which the cross section gradually changes from a rectangular shape to a circular shape, and surrounds the strand 3 and the plurality of strands 3 that are axial lines. It consists of a ring-shaped rebar 5 arranged.

  The band reinforcing bar 5 has a circular shape or a rectangular shape, and the band reinforcing bar 5 at one end of the casing 1 is rectangular, but gradually goes from the rectangular shape to the circular shape toward the other end side. The band rebar 5 at the other end changes to a circular shape.

  Here, as a method of changing the shape from a rectangular shape to a circular shape, as shown in FIG. 6 (d), the radius 5a of the side of the rectangular reinforcing bar 5 is gradually increased from infinity (= straight line) to a circular shape. As shown in FIG. 6 (e), there are a method in which the radius 5b of the corner of the rectangular band reinforcing bar 5 is gradually approached from 0 (= the angle is a right angle) to a circular radius.

By setting it as such a shape, even if it is a case where the cross-sectional shape of a pile and a pillar differs, the connection of a pile and a pillar becomes easy by utilizing the frame 1a as a reinforcing bar of a pile.
The strand 3 and the band reinforcing bar 5 are connected to each other at a crossing point by a coupling jig (not shown), and the strand 3 is rotatable with respect to the band reinforcing bar 5.

When the housing 1 is in the state shown in FIG. 6 (a), the strand 3 and the rebar 5 intersect substantially perpendicularly, but when the strand 3 is bent in the direction indicated by the arrow A2 in FIG. 6 (a), The strand 3 rotates and the crossing angle with the belt reinforcing bar 5 changes.
Then, at the same time as the strand 3 becomes spiral, the bar spacing of the band reinforcing bars 5 is gradually reduced, and the length of the housing 1 is shortened as shown in FIG. 6 (b).

  In this way, by shortening the casing 1, it is possible to construct a reinforcing bar even in a narrow space, and facilitate transportation and storage.

Moreover, as shown in FIG.6 (c), while changing the shape of a cross section from circular to a rectangle, you may form the cross section so that a diameter may expand.
By adopting such a shape, even if the cross-sectional shapes of the pile and the column are different, the connection between the pile and the column becomes easy, and the pile has a shape that expands in diameter. Reinforcing bars bending work and bar arrangement work such as two-stage bar arrangement become unnecessary, and workability is improved.

  In addition, the material of the strand 3 and the band reinforcement 5 which comprise the housing 1b and the housing 1c is the same as that of the housing 1.

Next, a method for connecting a pile and a pillar using the frame 1b will be described. FIGS. 7 and 8 are diagrams showing a procedure for constructing and connecting a pile and a pillar using the frame 1b, and FIG. 9 is a detailed view and a modified example of the steel pillar 31 of FIG.
FIG. 10 is a detailed view showing the connecting portion 33 of FIG. 9 and its modification.

First, as shown to Fig.7 (a), the excavation hole 9b is provided in the place where the pile of the ground 7 is constructed.
The cross-sectional shape of the excavation hole 9b is circular.

Next, as shown in FIG. 7 (b), the housing 1b is moved in the B2 direction in a contracted state, and is disposed immediately above the excavation hole 9b.
In addition, the apartment 11b which is a jig | tool for a connection with a pillar is connected to the upper end of the housing 1b.

Next, as shown in FIG.7 (c), the housing 1b is extended | stretched to C2 direction, and is arrange | positioned in the excavation hole 9b.
In this way, by using the casing 1b using the strand 3, it is easy to construct a reinforcing bar even under low-headed and narrow construction conditions.

  Next, as shown to Fig.8 (a), the concrete 13b is laid in the excavation hole 9b, and the pile 13c is constructed | assembled.

  Next, as shown in FIG.8 (b), the steel pillar 31 is moved on the pile 13b, and as shown in FIG.8 (c), the connection part 33 is connected with the apartment 11b of the housing 1, and connection is carried out. A steel pillar 31 is constructed on the part 33.

As shown in FIG. 9A, the steel column 31 has a rectangular tubular shape, and a connecting portion 33 having a rectangular planar shape is provided on the lower surface.
As shown in FIG. 10A, the connecting portion 33 has a plate-like fixing plate 35, and the apartment 11 b is provided so as to penetrate the fixing plate 35.

The apartment 11 b is fastened to the fixing plate 35 by nuts 37 a and 37 b provided so as to sandwich the fixing plate 35.
In this way, the housing 1b and the steel column 31 are integrally connected.

  In addition, you may provide a connection part in the side surface instead of the lower surface of steel columns like the steel column 31b shown in FIG.10 (b).

  The structure of the connecting portion 33b in this case has a plate-like fixing plate 35 like the connecting portion 33, and the apartment 11b is provided so as to penetrate the fixing plate 35, and a nut provided so as to sandwich the fixing plate 35 therebetween. It is fastened to the fixing plate 35 by 37a and 37b.

  Moreover, as shown in FIG.10 (c), you may use the steel pillar 31c which combined H shape steel instead of a rectangle. In such a case, it is desirable that the planar shape of the connecting portion 33c be an octagon instead of a rectangle.

  Thus, according to 2nd Embodiment, the reinforcing bar which comprises the pile 13b is the extendable frame 1b which used the strand 3. FIG. Therefore, the same effects as those of the first embodiment are obtained.

  Further, according to the second embodiment, the housing 1b has a structure in which the cross-sectional shape gradually changes from a rectangle to a circle. Therefore, even if the cross-sectional shapes of the pile and the column are different, the connection between the pile and the column becomes easy.

  Furthermore, according to the second embodiment, since the steel column 31 is used as the column, it is not necessary to place concrete when the column is constructed, and workability is improved.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows the housing 1 The figure which shows the procedure of construction and connection of a pile and a pillar using frame 1 The figure which shows the procedure of construction and connection of a pile and a pillar using frame 1 Detailed view and modification of the connecting portion 15 of FIG. Detailed view showing the connecting portion 21 and the connecting portion 21b of FIG. The figure which shows the housing 1b The figure which shows the procedure of construction and connection of a pile and a pillar using the frame 1b The figure which shows the procedure of construction and connection of a pile and a pillar using the frame 1b Detailed view and modification of the steel pillar 31 of FIG. Detailed view showing the connecting portion 33 of FIG. 9 and its modification

Explanation of symbols

1 ………… Housing 3 ………… Strand 5 ………… Reinforcement 7 ………… Ground 9 ………… Drilling hole 11 ………… Mansion 13b …… Pile 15 ……… Connecting part 17b… ... Column 21 ... ... Connection 22 ... ... Different diameter coupler 23 ... ... Nut 31 ... ... Steel pillar 33 ... ... Connection 37 ... ... Nut

Claims (6)

A circular or polygonal band reinforcing bar, and a strand disposed inside or outside the band reinforcing bar and rotatably coupled to the band reinforcing bar , and is formed by spiraling the strand. A method of connecting a pile and a column member using a frame , wherein the axial cross-sectional area and / or the cross-sectional shape is gradually changed ,
A step (a) of excavating the ground and providing an excavation hole;
Inserting the housing in a state of reduced length by spiraling the strand into the excavation hole (b);
(C) placing the strand in the excavation hole while extending the length by straightening the strand;
(D) constructing a pile by placing concrete in the excavation hole;
A step (e) of constructing a column member on the pile;
Connecting a connecting means to the housing (f);
Connecting a reinforcing bar to the connecting means (g);
A method of constructing the column member by placing concrete around the reinforcing bar (h);
The connection method of a pile and a column member characterized by comprising.   The method for connecting a pile and a column member according to claim 1, wherein the connecting means is a different diameter coupler that connects the strand and the reinforcing bar integrally.   3. The method for connecting a pile and a column member according to claim 2, wherein a fixing plate for adjusting a difference in axial force between the strand and the reinforcing bar is provided on the different diameter coupler.   The method for connecting a pile and a column member according to any one of claims 1 to 3, wherein the excavation hole is stepped.   A connection structure constructed using the method for connecting a pile and a column member according to any one of claims 1 to 4. A circular or polygonal strip reinforcement,
A strand disposed inside or outside the band rebar and rotatably coupled to the band rebar;
Have
The length can be reduced by spiraling the strand,
A casing characterized by a gradual change in the cross-sectional shape in the axial direction.

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