JP2948525B2 - Construction method, reinforcement method and construction device of prismatic structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a prismatic structure such as a pier or a pillar of a building, a method for reinforcing an existing prismatic structure, and a construction apparatus used for the method.

[0002]

2. Description of the Related Art The inventors of the present invention have previously described a method of constructing a new columnar structure having a cross-sectional profile consisting of a smooth convex curve such as a circle, an ellipse, and an ellipse, and a method of reinforcing an existing columnar structure. And an apparatus used for implementing those methods (Japanese Patent Application No. 7-275793).

According to this technique, a high-tensile wire is spirally wound around a columnar concrete core or an existing concrete structure having a cross section profile having a smooth convex curve such as a circular cross section, and one end of the wire is wound. Fix the wire and temporarily fix the other end, tension the wire in order from one end and press it against the surface of the columnar concrete core or existing concrete structure, and fix the other end of this wire to the columnar concrete core or existing concrete structure Then, surface concrete is constructed.

[0004] According to this technique, work such as rebar and formwork is not required, and since prestress is introduced in the circumferential direction, a reinforcing effect is produced from a normal loaded state, and higher proof stress is obtained. It has excellent effects such as being able to be imparted.

[0005]

SUMMARY OF THE INVENTION The present invention extends the above technology to the construction of a new prismatic structure or the reinforcement of an existing prismatic structure. The purpose is to provide. The present invention minimizes rebars and formwork on site, integrates the reinforcing structure with a prismatic concrete core, or an existing prismatic structure, and also loads the reinforcing structure from normal load conditions. In addition, it is an object of the present invention to provide a method of constructing and reinforcing a prismatic structure having a structural system that suppresses the displacement itself instead of functioning after a large displacement occurs.

According to the present invention, a wire rod temporarily wound spirally on the surface (wall surface) of a concrete core of a newly-established prism-shaped structure or the wall surface of an existing structure is sequentially run from one end side while traveling on the wall surface. It is an object of the present invention to provide a simple apparatus used for constructing or reinforcing a prismatic structure. Such a device must be a device that can easily change the direction of pulling the wire at the ridge of the prismatic structure in a direction along the sides of the prismatic structure.

[0007]

Means for Solving the Problems A first invention of the present invention is:
In constructing the prismatic structure, a prismatic concrete core is constructed and cured, and a high-tensile wire is spirally wound around the peripheral surface of the core, and one end of the wire is fixed to the core and the other end is fixed. Temporarily fixing, while changing the traction direction of the wire for each ridge angle of the core in a direction along the side of the core, the wire is sequentially tensioned from one end and pressed against the surface of the core, and the other end of the wire is A method for constructing a prismatic structure, comprising fixing to the core and then applying surface concrete to the outer surface of the core to construct a prismatic structure.

According to a second aspect of the present invention, in reinforcing the existing prismatic structure, a high tension wire is spirally wound around the peripheral surface of the existing prismatic structure, and one end of the wire is connected to the existing prismatic structure. And the other end is temporarily fixed, and while changing the pulling direction of the wire to the direction along the side of the prismatic structure at each ridge angle of the prismatic structure, the wire is sequentially tensioned from one end to the existing prismatic structure. This is a method for reinforcing a prismatic structure, comprising crimping the wire onto the surface of the object, fixing the other end of the wire to the existing prismatic structure, and reinforcing the existing prismatic structure.

As a construction apparatus of the present invention capable of suitably implementing the above first and second aspects of the present invention, there are provided a first and a second two pulleys around which a wire is wound, and two of these pulleys. A jack for applying tension to a wire wound around the first and second pulleys with the pulley shafts separated from each other;
A traveling tensioning device including a traveling wheel provided coaxially with the second pulley; third, fourth, and fifth winding wires;
And an auxiliary device including a traveling wheel provided coaxially with the fourth pulley, wherein the first pulley, the third pulley, and the fifth pulley are shared. The first and second pulley central axes of the traveling tensioning device and the third and fourth pulley central axes of the auxiliary device, which are mounted on the shaft and projected on a plane perpendicular to the common axis, intersect at an intersection angle of less than 180 degrees. The present invention provides a construction device for a prismatic structure, characterized in that: This device is configured so that the traveling tensioning device can easily change the tensioning direction of the wire rod at the ridge portion of the prismatic structure with the aid of the auxiliary device, and its operation will be described later with reference to embodiments. . In addition, it is preferable that the auxiliary device includes a jack that separates the two pulley shafts from each other and applies tension to the wound wire rod, so that the tension stroke can be increased, which is preferable.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A prismatic concrete structure to which the present invention is applied is a structure relatively small as compared with a large cylindrical concrete tank or the like, for example, a structure such as a pier or a pillar of a building structure. According to the first invention of the present invention, when a prismatic concrete structure is newly constructed, a reinforced concrete or prestressed concrete core is first constructed, and a tension member for introducing hoop stress is wound around the core. In this case, the design of the structure performs the optimal design according to this structure.

A second aspect of the present invention is a reinforcement for reinforcing an existing structure by mechanically integrating a reinforcing portion with the existing structure. The device of the present invention is a spirally wound high tension wire, such as a PC steel wire, wound around the peripheral surface of a prismatic concrete structure without tension, temporarily fixing one end thereof, and tensioning the other end. The wire rods are fixed so that they can be mounted so that they are loosened, and the wires are tightened and crimped so as to apply hoop stress to the prismatic structure while sequentially tightening the wires from the fixed end side. Such a device must have a mechanism for changing the direction of traction at the corners of the prismatic concrete structure. In the tensioning device for a wire wound around a prismatic structure, at least two return loops are provided on the wire wound around the prismatic structure, and the loops are respectively wound around two sets of two front and rear pulleys. The central axes of the two sets of rewind loops are 180
It is connected continuously so that it has an intersection angle of less than degree, and the pressing loop is changed from the loop pressing on one side at the corner of the prismatic concrete structure to the loop pressing the other loop on the next side By doing so, the direction of tension of the wire can be changed.

Further, the tension between the pulley shafts is imparted to the wire rod by pushing and expanding with a predetermined force with a jack. In this way, while the tension is sequentially applied from the fixed end, the helically provisionally wound wire is pulled and the tension device is caused to orbit around the structure surface. Run the tensioning device to the temporarily fixed end,
Tension is introduced over the entire length of the wire, and the other end of the wire at the rear end of the tensioning device is fixed to the structure, thereby applying a compressive force from the surface of the structure toward the center to the structure. In this case, a short wire of about several turns may be fixed at both ends and sequentially arranged in series. In the case of a long wire, a fixing unit may be provided in the middle, and the tensioning operation may be repeated from this fixing unit again. .

This device can also be used for tensioning a high-tensile wire wound around a peripheral surface of a structure having a cross-sectional profile having a smooth convex curve such as a circular cross-section.
It is particularly suitable when it is desired to increase the tension stroke. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 is a schematic perspective view illustrating the method of the present invention. The wire 3 is temporarily wound spirally around a prismatic concrete core or an existing prismatic structure (hereinafter referred to as a prism 10). The end of the winding start of the wire 3 is a prism 1
0, and the other end is temporarily fixed. This wire 3
The wire 3 is crimped to the outer periphery of the prism 10 while sequentially tightening from the fixed end of the winding start. In this tension, it is necessary to change the pulling direction of the wire to the direction along the side of the prism 10 at the corner of the prism 10.

As a specific means for sequentially tensioning the wire 3 from the winding start end, for example, a tensioning device 1 is used.
The tensioning device 1 is composed of a traveling tensioning device 2 and an auxiliary device 12, as shown in FIG. 1 showing a side view and FIG. 2 showing a plan view thereof (a view taken along the line AA in FIG. 1). The traveling tensioning device 2
First and second two pulleys 5, 5 'around which the wire 3 is wound
A jack 7 for applying tension to the wire 3 wound around the first and second pulleys 5 and 5 'by separating the two pulley shafts as shown by an arrow 6; , Running wheels 8 provided coaxially with the second pulleys 5 and 5 ′,
8, 8 'and 8'. The auxiliary device 12 is a third and a fourth two pulleys 15 and 15 ′ around which the wire 3 is wound.
A jack 17 for separating the two pulley shafts as shown by an arrow 6 ′ and applying tension to the wire 3 wound around the third and fourth pulleys 15 and 15 ′; 4
Running wheels 18 provided coaxially with the pulleys 15 '
And a fifth pulley 16 coaxial with the pulleys 5 ′ and 15. The traveling tensioning device 2 and the auxiliary device 12 share a common shaft 9 and are connected to the center axes of the first and second pulleys and the third and fourth pulleys.
And is connected so as to intersect at an intersection angle of less than 180 degrees. In the example of FIG. 1, they intersect at right angles.

FIG. 4 is an explanatory view when the wire 3 is wound around the tensioning device 1. The wire 3 is wound around the pulley 5 ′ from the pulley 5 ′, and then around the pulleys 16, 5 and 15.
When the tensioning device 1 is in contact with the prism 11 in the posture shown in FIG. 4 along the surface of the side 11, the wire 3 engaged with the tensioning device 1 is pulled by the pulley 5 ′ of the tensioning device 1. Therefore, the tension device 1 is urged in a direction in which the tension device 1 is pressed against the wall surface of the prism 10. FIG. 5 shows a state where the prism 10 turns around the ridge 32. In the corner 32, the wire 3 extends from one side 11 of the prism 10 to the next side 11.
The wire 3a changes direction in the direction of a. The tensioning device 1 pivots as shown by the arrow 31, and pulleys 15, 1
The posture is changed so that 5 ′ is along the side 11a. This change may be made automatically by a command from a sensor that recognizes the ridge angle.

The wire 3 includes first to fifth pulleys 5, 5 ', 1
After forming a loop around 5, 15 ′, and 16 in order and winding it around, it is pulled and tensioned by the tensioning device 1. The second pulley 5 ′, the third pulley 15, and the fifth pulley 16 are mounted on a common shaft 9. The first pulley 5 and the second pulley 5 ′ have wheels 8, 8,
8 ', 8' are mounted and the device runs around the prism 10 by means of the wheels.

The tensioning device 1 includes a pair of pulleys 5,
Since tension is applied to the wire while being balanced in the device by 5 ': 15,15' and 16, no special reaction device is required for the tension of the wire. And prism 1
The vehicle is guided by the wire 3 already wound around 0.
6 to 10 show a process in which the tensioning device 1 introduces tension into the wire.
It was shown to. Now, as shown in FIG.
Suppose you are running on one side of 0. The traveling tensioning device 2 is traveling rightward as viewed in FIG. 6 while tensioning the wire along the surface of the prism 10. Then, as shown in FIG. 7, when the wheel in front of the traveling tension device 2 arrives at the ridge of the prism 10, the tension device 1 turns around the ridge as shown in FIG. At this time, the wire turns after confirming that the tension of the wire is a predetermined value. In the state of FIG.
2 is along the side of the prism 10 and proceeds while continuously applying a predetermined tension to the wire. At this time, the jack that applies tension to the wire may be the jack provided in the traveling tensioning device 2, the jack provided in the auxiliary device 12, or both. When the tensioning device 1 traveling in the state shown in FIG. 9 has traveled more than the distance between the pulleys at both ends of the traveling tensioning device 2, the traveling tensioning device 2 is turned backward as shown in FIG. Change the posture to the posture along the side and run. The state in FIG. 10 is the same as the state shown in FIG. Hereinafter, the steps of FIGS. 6 to 10 are repeated again,
Continue until tension on the entire length of the wire is completed. When the tension of the entire length of the wire is completed, the end of the wire is fixed. This is the end of the tensioning step.

It should be noted that the method of the present invention does not prevent the present invention from being carried out by any means other than using the tensioning device 1.
For example, in the step of tensioning the wire, a tension may be applied using a tension die or a pinch roll.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One side 70 shown in FIG.
A square pillar of a building having a height of 3 m and a height of 3 cm was covered and reinforced by the method of the present invention. Considering flexibility and adhesion as a wire,
PC steel wire (JISG3536 SW)
PD3). The end of the wire 3 was temporarily fixed to the reinforcing area of the prism 10, and the wire 3 was spirally wound toward the lower end of the prismatic structure while circling the outer periphery of the prism 10.
No special tension needs to be applied during this winding.
Also, the vertical interval (spiral pitch) of the wire 3 does not need to be strict, and the wire 3 may be wound at an appropriate interval.

After winding the necessary number of times in the reinforcing area, the wire 3
, A loop is formed, and the loop is wound around five pulleys 5, 5 ', 15, 15', 16 of the tensioning device 1, and the five pulleys 5, 5 ', 15, 15' are wound. , 16
Is reduced to the minimum distance, and the end of the wire 3 is permanently fixed. The shafts of the pulleys 5, 5 ′, 15, 15 ′, 16 are pushed and spread by jacks 7, 17 to remove slack of the wire 3 and to apply tension to the wire 3.

In this state, the wire rod 3 temporarily fixed on the side of the prism 10 via the traveling wheel in contact with the outer surface of the prism 10
The tensioning device 1 is moved substantially horizontally on the outer periphery of the structure toward the end of. At the ridge corner of the prism 10, while the tension device 1 is turned to change the traveling direction, the tension is sequentially applied from the fixed-side end of the temporarily wound wire. The tension device 1 is caused to travel while shifting up so that the wire 3 is wound at a predetermined vertical interval (spiral pitch). By applying tension to the wire 3, the wire 3 elongates, and the tension decreases at the same pulley shaft interval. Therefore, the pulleys 5, 5 ′;
The gap is appropriately extended and separated to maintain the tension constant. This is achieved by pulleys 5, 5 ';
It is performed by pushing and expanding between the axes of 5 ′ and 16 ′.

If the number of turns of the wire is large, the amount of elongation of the wire accumulates and increases, and the elongation cannot be absorbed by the above operation. Therefore, the tensioned wire is temporarily fixed, the tensioning device is replaced, and the operation is continued. At this time, the tensioning device needs to travel only with the rotational bearing resistance of the pulley and the centrifugal force due to the tension, and thus the traveling resistance of the surface of the structure and the traveling wheels.

The above operation is performed up to the end of the spirally wound wire, and when tension is applied to the entire length of the wire, the rear end side of the wire tensioning device is fixed to the structure. Next, the temporary fixing of the wire rod end is removed, and the tensioning device is disassembled and removed. The wire is terminated, and the surface of the structure is sprayed with anticorrosion and protection spray mortar to complete the reinforcement. According to the method of the present invention, the tension wire can be helically wound in advance, and the tension can be rationally introduced with a relatively simple tensioning device.

In the above description, a prism having a quadrangular cross section has been described, but it may be a polygon. In addition, the introduction of the tension can be performed not only from below but also from above.

[0025]

According to the method of the present invention, work such as rebar and formwork removal is minimized, and the wire wound in the circumferential direction is tensioned to introduce prestress. The reinforcement effect (confined effect) is generated from the loaded state, and higher proof stress can be imparted.

[Brief description of the drawings]

FIG. 1 is a side view of a tensioning device according to an embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of the embodiment.

FIG. 4 is an explanatory view for explaining winding of a wire rod of the embodiment device.

FIG. 5 is an explanatory diagram for explaining a ridge corner turning of the embodiment apparatus.

FIG. 6 is a process chart for introducing tension into a wire.

FIG. 7 is a process chart for introducing tension into a wire.

FIG. 8 is a process chart for introducing tension into a wire.

FIG. 9 is a process diagram for introducing tension into a wire.

FIG. 10 is a process chart for introducing tension into a wire.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tension device 2 Traveling tension device 3 Wire 4 Tension device (reinforcement device) 5, 5 ', 15, 15', 16 Pulley 6, 6 'Arrow 7, 17 Jack 8, 8', 18 Wheel 9 Common shaft 10 Square pillar Concrete core or existing prismatic structure (prism) 11 side 12 auxiliary device 13 handle 31 turning direction (arrow) 32 corner

Claims (4)

(57) [Claims] In constructing a prismatic structure, a prismatic concrete core is constructed and cured, and a high-tensile wire is spirally wound around a peripheral surface of the core, and one end of the wire is connected to the core. The wire is fixed to the body and the other end is temporarily fixed, and while the pulling direction of the wire is changed along the sides of the core at each ridge angle of the core, the wire is sequentially tensioned from one end and crimped to the surface of the core. And fixing the other end of the wire to the core, and then constructing a prismatic structure by constructing surface concrete on the outer surface of the core. 2. When reinforcing an existing prismatic structure, a high-tensile wire is spirally wound around the peripheral surface of the existing prismatic structure,
One end of the wire is fixed to the existing prismatic structure, and the other end is temporarily fixed, while changing the traction direction of the wire to the direction along the side of the prismatic structure for each ridge angle of the prismatic structure. The wire is tensioned sequentially from one end and pressed against the surface of the existing prismatic structure, the other end of the wire is fixed to the existing prismatic structure, and the existing prismatic structure is reinforced. A method of reinforcing columnar structures. 3. A first and a second pulley around which a wire is wound, and tension is applied to the wire wound around the first and second pulleys by separating the two pulley shafts. A traveling tensioning device including a jack and traveling wheels provided coaxially with the first and second pulleys; third, fourth and fifth pulleys around which wires are wound; And an auxiliary device including a traveling wheel provided coaxially with the first pulley, wherein the first pulley, the third pulley, and the fifth pulley are mounted on a common shaft, and are orthogonal to the common shaft. Wherein the first and second pulley central axes of the traveling tensioning device projected on the surface to be projected and the third and fourth pulley central axes of the auxiliary device intersect at an intersection angle of less than 180 degrees. Construction equipment for structures. 4. The prismatic structure according to claim 3, wherein the auxiliary device has a jack for separating the third and fourth pulley shafts and applying a tension to the wound wire. Construction equipment.