KR102483165B1 - Tensile device for PHC pile - Google Patents

Abstract

The present invention relates to a tensile device for a PHC pile, which is installed to apply tensile force to a reinforcing member for increasing bending strength, comprising: a main body having a hollow cylindrical shape and having a front through hole formed at the front center into which a tension shaft tensioned together with the reinforcing member can be inserted; a cylinder unit screwed to the tension shaft to enable the tension shaft to reciprocate in the direction corresponding to the longitudinal direction of the main body; and a tension nut connection unit that automatically rotates a tension nut coupled to the tension shaft to maintain tension force so that the tension nut moves in the direction of the tension shaft. Accidents can be reduced when a prestressing wire is cut.

Description

Tensile device for PHC pile}

The present invention relates to a tensioning device for a PHC pile, and more particularly, to a tensioning device for a PHC pile capable of tensioning a PC steel wire in a PHC pile.

In general, when a building or structure is erected, foundation work is performed to reinforce the ground in order to support the upper structure according to the conditions of the ground or the load of the building or structure.

Accordingly, a shallow foundation or a deep foundation is performed depending on various conditions such as the load of the structure or the condition of the ground. In the case of a shallow foundation, the structure is directly supported on the ground without using a pile, and the ground under the structure is When the load cannot be supported, the supporting capacity is reinforced using piles.

Pile can be classified into steel pipe pile, concrete pile, composite pile, etc. according to the material, and can be divided into type method, embedding method, and on-site casting method according to the construction method.

The type construction method is to forcefully insert the pile into the ground by striking the pile from above after setting up the pile. While the construction is simple, it is a general pile construction method in which noise and vibration caused by impact equipment such as hammers are relatively large. Construction is limited.

Recently, PHC piles manufactured by centrifugal force and autoclave curing are mainly used. The PHC pile is a high-strength column of the pre-tension method, and the allowable compressive stress of concrete is very large, so it can withstand a large axial load, and by introducing prestress into the concrete, it is excellent in impact resistance and tensile stress.

Although the strength of the PHC pile is 80 ~ 110MPa or more, the tensile strength is about 10MPa, so the force received vertically is large, but the force received horizontally is weak. improve resistance.

In this way, in order to increase the resistance to the horizontal force of the PHC pile, the PC steel wire is tensioned to increase the resistance to bending.

By the way, during the tensile work of the conventional PHC pile, the PC steel wire is tensioned using a tensioner. The tension nut fastened to the tension shaft must be rotated by hand by the operator, and the tension nut and the tension shaft are As a result, there was a problem that a lot of work time was required.

In addition, there is a problem that the worker is exposed to the risk of safety accidents when an unfortunate accident occurs in which the PC steel wire is broken during the tensile work of the PC steel wire.

And, in the prior art, when the PC steel wire is tensioned with the hydraulic pressure of the tensioner, when the tensioning time is delayed, the hydraulic pressure of the tensioner is lost and it must be re-tensioned as much as the lost hydraulic pressure. There was a problem in that the strength was lowered.

Republic of Korea Patent Registration No. 2212675 (2021.02.01)

Accordingly, an object of the present invention is to provide a tensioning device for a PHC pile capable of improving the bending strength of a PHC pile by performing a tensioning operation on a PC steel wire using a mechanical mechanism including a motor and a chain.

The object of the present invention is not limited to the above-mentioned object, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

According to one aspect of the present invention in order to achieve the above object, using a mechanical mechanism including a motor and a chain during the tensioning operation of the PC steel wire, which is a reinforcing member, can automatically perform the tensile operation of the PC steel wire A tensioning device for PHC piles is provided.

The tensioning device for PHC piles according to an embodiment of the present invention is a tensioning device for PHC piles installed to apply tensile force to a reinforcing member for increasing bending strength, and has a hollow cylindrical shape, with the reinforcing member at the center of the front A main body having a front through hole into which a tension shaft to be extended is inserted, a cylinder unit screwed to the tension shaft to enable reciprocating movement of the tension shaft in a direction corresponding to the longitudinal direction of the main body, and coupled to the tension shaft A tension nut connection unit configured to automatically rotate a tension nut maintaining tension and move along a direction of the tension shaft may be included.

According to an embodiment of the present invention, a coupling chuck screwed with a male thread formed on a circumferential surface of the tension shaft may be provided at a front end of the cylinder unit.

According to an embodiment of the present invention, a fluid line may be connected to the cylinder unit so as to be operated by a working fluid.

According to an embodiment of the present invention, the tension nut connecting portion is concentric with a pulley concentric with the front through-hole of the main body, a chain that engages with the pulley and transmits rotational force of a driving motor to the pulley, and the pulley , A nut insertion portion having a nut insertion hole formed with an inner surface having the same shape as an outer circumferential surface of the tension nut so that the tension nut is inserted and fits snugly.

According to an embodiment of the present invention, the tension nut connecting portion and the cylinder unit may be located on the same axis as the tension shaft.

According to the present invention having the configuration as described above, the PC steel wire is automatically rotated by using a mechanical mechanism including a motor and a chain during the tensile operation of the PC steel wire, but the rotation time of the tensile nut is kept constant. It has the advantage of preventing the breakage of the PC steel wire and reducing the risk of safety accidents for workers when the PC steel wire is broken.

In addition, by maintaining the overall tensile work time constant, the tensile work time can be reduced and productivity can be improved, and the tensile force without deviation can be secured with a uniform tensile tonnage, thereby preventing the deterioration of the bending strength of the PHC pile. There is an effect.

1 is a cross-sectional view showing a PHC pile equipped with a tension shaft and a tension nut according to an embodiment of the present invention.
2 is a perspective view showing a tensioning device for PHC piles according to an embodiment of the present invention.
3 is a front view illustrating a tension nut connection unit according to an embodiment of the present invention.
Figure 4 is a side view of Figure 3;
5 is a side view showing a state before coupling a tensioning device for a PHC pile, a tensioning nut, and a tensioning shaft according to an embodiment of the present invention.
6 is a cross-sectional view showing a state before a tensioning operation of a tensioning device for a PHC pile according to an embodiment of the present invention.
7 is a cross-sectional view showing a state after a tensioning operation of a tensioning device for a PHC pile according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Thus, in some embodiments, well-known process steps, well-known device structures, and well-known techniques have not been described in detail in order to avoid obscuring the interpretation of the present invention. Like reference numbers designate like elements throughout the specification.

In the drawings, the thickness is shown enlarged to clearly express the various layers and regions. Like reference numerals have been assigned to like parts throughout the specification. When a part such as a layer, film, region, plate, etc. is said to be “on” another part, this includes not only the case where it is “directly on” the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between. In addition, when a part such as a layer, film, region, plate, etc. is said to be "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part is present in the middle. Conversely, when a part is said to be "directly below" another part, it means that there is no other part in between.

The spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe the correlation between elements or components and other elements or components. Spatially relative terms should be understood as encompassing different orientations of elements in use or operation in addition to the orientations shown in the figures. For example, when flipping elements shown in the figures, elements described as “below” or “beneath” other elements may be placed “above” the other elements. Thus, the exemplary term “below” may include directions of both below and above. Elements may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

In this specification, when a part is said to be connected to another part, this includes not only the case where it is directly connected, but also the case where it is electrically connected with another element interposed therebetween. In addition, when a part includes a certain component, it means that it may further include other components without excluding other components unless otherwise specified.

In this specification, terms such as first, second, and third may be used to describe various components, but these components are not limited by the terms. The terms are used for the purpose of distinguishing one component from other components. For example, a first component may be termed a second or third component, etc., and similarly, a second or third component may be termed interchangeably, without departing from the scope of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Hereinafter, a tensioning device for a PHC pile according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the tensioning device for PHC piles according to the present invention, the PHC pile 10 performing tension using the tensioning device for PHC piles will be described.

1 is a cross-sectional view showing a PHC pile equipped with a tension shaft and a tension nut according to an embodiment of the present invention.

As shown in FIG. 1, the PHC pile 10 according to the present invention may be a concrete pillar having a predetermined length and having a hollow inside.

The PHC pile 10 is provided with a reinforcing member 20 so that the bending strength increases along the longitudinal direction, and the reinforcing member 20 is generally made of PC steel wire.

The reinforcing member 20 includes a head portion 21 configured to be fixed to one end and the other end of the PHC pile 10 and an extension portion 22 extending along the longitudinal direction of the PHC pile 10. Here, the diameter of the head part 21 is formed larger than the diameter of the extension part 22 .

A plurality of reinforcing members 20 are installed along the circumference of the PHC pile 10 at predetermined intervals.

In the reinforcing member 20, the head part 21 is inserted into the concave fixing holes 32 and 33 provided in the top plate 30 and the base plate 31 at both upper and lower ends, respectively, so that the extension part 22 ) becomes possible to fix while maintaining a taut tension. Here, the fixing holes 32 and 33 are configured to a size sufficient to fit and fix the head portion 21 of the reinforcing member 20 .

The top plate 30 is provided with a reinforcing band 40 such as a band, shoe or anchoring in a shape surrounding the circumferential surface of the PHC pile 10, and similarly, the base plate 31 also has reinforcement such as a band, shoe or anchoring. A band 41 is provided and more firmly installed on the PHC pile 10.

A reinforcing plate 50 is provided on the top of the top plate 30, and a fastening hole 51 capable of fastening a fastening member 52 such as a bolt is formed in the reinforcing plate 50. A plurality of fastening holes 51 may be formed along the outer circumference of the reinforcing plate 50 .

The reinforcing plate 50 has a thicker thickness than the top plate 30 , and the fastening member 52 is fastened to the fastening hole 51 to be coupled to the top plate 30 .

In addition, a tension plate 81 is provided below the base plate 31, and a fastening hole 81b into which fastening members 82 such as bolts can be fastened is formed in the tension plate 81. A plurality of fastening holes 81b may be formed along the outer circumference of the tension plate 81 and may be formed at positions corresponding to the fixing holes 32 of the top plate 30 .

In the tension plate 81, a screw hole 81a is formed through the center of the body so that one end of the tension shaft 83 is screwed together. The tension plate 81 may be coupled with the base plate 31 by fastening the fastening member 82 to the fastening hole 81b. The tension plate 81 may have a thicker center of the body where the screw hole 81a is formed than other parts. In this way, the shape of the center of the body of the tension plate 81 can increase the screw coupling force with the tension shaft 83 .

A mold unit 70 surrounding the PHC pile 10 is provided on the outside of the PHC pile 10 according to the present invention.

The mold unit 70 has a hollow inside and is composed of a first mold 71 and a second mold 72 having semicircular cross-sectional structures symmetrical to each other. Inside the mold unit 70, a hollow part is provided in a form corresponding to the shape and diameter of the PHC pile 10 to be manufactured, and the PHC pile 10 is manufactured by performing a process of pouring concrete. This process consists of a process of manufacturing concrete by weighing and mixing cement, sand, gravel, water, etc. according to a pre-mixed weight, and a process of putting the manufactured concrete into a mold.

After the mold unit 70 brings the first mold 71 and the second mold 72 into correspondence with each other, a coupling member (not shown) formed on at least a portion of the first mold 71 and the second mold 72. By fastening a fastening member (not shown) such as a bolt to a fastening hole (not shown) provided in the hollow mold unit 70 having a predetermined length having an internal space, the coupling is completed.

Both ends, which are one end and the other end of the mold unit 70, are blocked and closed by the closing plate 60 assembled by a plurality of fastening members and the reinforcing plate 50 described above. A lead-out hole 61 is provided at the center of the end plate 60 so that the end of the tension shaft 83 screwed to the tension plate 81 can be drawn out.

Such a mold unit 70 has a circular cross-sectional shape by combining a first mold 71 and a second mold 72 made of a semicircular cross-sectional shape to manufacture a PHC pile 10 having a substantially circular cross-sectional shape. Although it has been described that it is formed, it is not limited thereto, and various modifications are possible within the technical idea, such as a square cross-sectional shape can be formed by combining the first mold 71 and the second mold 72.

1 is a view showing a PHC pile equipped with a tensile shaft and a tensile nut according to the present invention, a tensile unit 80 in the mold unit 70 to apply tensile force to some components of the manufactured PHC pile 10 can be configured in an installed form.

The tensile part 80 is pulled to one side by the traction of the tension shaft 83, and the reinforcing member 20 connecting the top plate 30 and the base plate 31 on the other side is pulled tight, that is, in a tense state. It is a configuration to be able to maintain.

The tension unit 80 includes the tension plate 81 installed inside the mold unit 70 and fastened and fixed to the base plate 31 via a fastening member. In addition, the tensile part 80 has one end connected to the tension plate 81 and the other end exposed to the outside through the lead-out hole 61 of the closing plate 60, and coupled to the tension plate 81 of a predetermined length. A tension shaft 83 is included.

In addition, the tensile unit 80 further includes a tensile nut 84 screwed with a male threaded portion 83a formed on the circumferential surface of the other end of the tensile shaft 83 to fix the tensile shaft 83 to the closing plate 60. can include

The tension nut 84 is pulled outward by the tension device, and the reinforcing member 20 is also pulled outward together with the tension nut 84, so that a tensile force can be applied to the reinforcing member 20.

2 is a perspective view showing a tensioning device for a PHC pile according to an embodiment of the present invention, FIG. 3 is a front view showing a tension nut connection according to an embodiment of the present invention, and FIG. 4 is a side view of FIG. 3 .

As can be seen from the drawings, the tension device 100 according to the present invention includes a main body 110, a cylinder unit 120 and a tension nut connection part 130.

The main body 110 has a hollow cylindrical shape, and includes a front through hole 111 into which the tension shaft 83 can be inserted at the center of the front side and a rear through hole (not shown) through which a fluid line described below passes through the rear side.

The main body 110 includes a cylinder unit 120 to which a fluid line (not shown) is connected.

The cylinder unit 120 is concentric with the front through hole 111, installed in a direction corresponding to the longitudinal direction of the body 110, and reciprocates inside the body 110 by a working fluid such as air and oil. .

The front end of the cylinder unit 120 is provided with a coupling chuck 121 screwed to the male threaded portion 83a of the tension shaft 83. The coupling chuck 121 is rotatably formed to be fastened to the male threaded portion 83a of the tension shaft 83.

In addition, the tension device 100 according to the present invention is connected to the tension nut 84 and includes a tension nut connector 130 capable of automatically rotating the tension nut 84 .

The tension nut connection part 130 includes a pulley 133 concentric with the front through hole 111 of the main body 110, and a chain that is engaged with the pulley 133 to transmit the rotational force of the driving motor 131 to the pulley 133. (132). Here, the driving motor 131 may be a step motor capable of precise control, and an output shaft of the driving motor 131 may be connected to the chain 132, and forward and reverse rotation is possible.

In addition, the tension nut connection portion 130 is concentric with the pulley 133 and has an inner surface having the same shape as the outer circumferential surface of the tension nut 84 so that the tension nut 84 is inserted and fits snugly. It includes a nut insertion portion 134 in which a nut insertion hole 134a is formed.

The chain 132 is provided to connect the pulley 133 located inside the body 110 and the driving motor 131 located outside the body 110 to each other, and receives rotational driving force of the driving motor 131. The rotation of the pulley 133 may proceed.

Here, the tension nut connecting portion 130 and the cylinder unit 120 are located on the same axis as the tension shaft 83 . Therefore, the tension shaft 83 passes through the nut insertion hole 134a of the nut insertion portion 134 and can be screwed into the coupling chuck 121 of the cylinder unit 120 .

On the other hand, a method of applying tension after the reinforcing member 20 constituting the PHC pile 10 is installed can be described.

5 is a side view showing a state before coupling a tensioning device for a PHC pile, a tension nut, and a tensioning shaft 83 according to an embodiment of the present invention, and FIG. 6 is a view of a tensioning device for a PHC pile according to an embodiment of the present invention. 7 is a cross-sectional view showing a state after the tensioning operation of the tensioning device for PHC piles according to an embodiment of the present invention.

Hereinafter, with reference to FIGS. 5 to 7, the tensioning process of the tensioning device for PHC piles of the present invention will be described.

First, the main body 110 of the tensioning device 100 is moved to the mold unit 70 side of the PHC pile 10.

The nut insertion part 134 of the tension nut connection part 130 is inserted into the tension nut 84. That is, the tension nut connector 130 is inserted so that the outer circumferential surface of the tension nut 84 fits snugly into the nut insertion hole 134a of the nut insertion portion 134 .

When the tension nut 84 is inserted into the nut insertion portion 134, the tension shaft 83 passing through the nut insertion hole 134a of the nut insertion portion 134 is coupled to the chuck 121 of the cylinder unit 120. can be combined with That is, the coupling chuck 121 of the cylinder unit 120 is inserted into the tension shaft 83 and integrated into the tension shaft 83 while being fastened to the male threaded portion 83a.

Thereafter, the tension shaft 83 moves together with the tension plate 81 by moving the cylinder unit 120 along the longitudinal direction of the PHC pile 10 in a direction for applying the tension force with the tension force of the predetermined working fluid.

At the same time, the reinforcing member 20 extending from the top plate 30 and the base plate 31 is also pulled while tensile force is applied to perform the tensioning operation.

In this way, when the tension shaft 83 is pulled, the controller (not shown) operates the driving motor 131 to rotate the pulley 133 of the tension nut connection part 130, and the nut integrated with the pulley 133 The insertion part 134 also rotates, and at the same time, the tension nut 84 inserted into the nut insertion hole 134a of the nut insertion part 134 rotates.

The tension nut 84 screwed to the tension shaft 83 is moved in the direction of the end plate 60 along the male threaded portion 83a in the longitudinal direction of the tension shaft 83, so that the tension shaft 83 is moved to the cylinder unit. Proceed in the direction of (120). That is, the tensile force is maintained in the tensile shaft 83 by rotating the tensile nut 84 so that the tensile state of the tensile shaft 83 can be maintained.

Tensile force is applied to the reinforcing member 20 by the tensioning operation of the cylinder unit 120 of the tensioning device 100 and the rotational operation of the tension nut connection part 130, so that the reinforcing member 20 moves in the longitudinal direction due to the nature of the steel material. will increase

Then, when the coupling chuck 121 of the cylinder unit 120 is removed from the tension shaft 83 and the nut insertion portion 134 of the tension nut connection portion 130 is separated from the tension nut 84, the tension operation is completed. do.

When the tensile work is completed, a process of curing the PHC pile 10 is performed, and this curing process is a process of accelerated curing of concrete using the thermal energy of steam, and the mold unit (70) supplied with steam and equipped with equipment ) and then curing at a predetermined temperature and time.

Thereafter, the mold unit 70 after the curing is completed is taken out, the bolts connecting the first mold 71 and the second mold 72 are dismantled, the mold unit is removed, and the PHC file ( The demolding operation of 10) is performed.

Therefore, the present invention can increase the resistance to bending by tensioning the reinforcing member 20 so as to improve the resistance to the horizontally applied force of the PHC pile 10.

In addition, the present invention utilizes mechanical mechanisms such as the drive motor 131 and the chain 132 to keep the rotation time of the tension nut 84 constant, thereby preventing the reinforcing member 20 from being broken, and preventing the reinforcing member from breaking. (20) can reduce the risk of safety accidents for workers due to breakage.

In addition, the present invention can improve productivity by reducing the tensile work time by maintaining the overall tension work time constant, and can secure the tensile force without deviation with a uniform tensile tonnage, thereby improving the bending strength of the PHC pile (10) degradation can be prevented.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operation and effect according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention above, it is natural that the effects predictable by the corresponding configuration should also be recognized.

10: PHC file
20: reinforcing member
21: head part
22: extension
30: top plate
31: base plate
32,33: fixed hole
40,41: reinforcement band
50: reinforcement plate
51: fastening hole
52: fastening member
60: closing plate
61: withdrawal hole
70: mold unit
71: first mold
72: second mold
80: tensile part
81: tension plate
81a: screw hole
81b: fastening hole
82: fastening member
83: tension shaft
83a: Male thread
84: tension nut
100: tension device
110: body
111: front through hole
120: cylinder unit
121: combined chuck
130: tension nut connection
131: drive motor
132: chain
133: pulley
134: nut insertion part
134a: nut insertion hole

Claims (5)

A tensioning device for PHC piles installed to give tension to reinforcing members for increasing bending strength,
A main body having a hollow cylindrical shape and having a front through-hole formed at the center of the front surface into which a tension shaft that is stretched together with the reinforcing member can be inserted;
a cylinder unit screwed with the tension shaft to reciprocate the tension shaft in a direction corresponding to the longitudinal direction of the main body; and
A tension nut connection portion that automatically rotates a tension nut coupled to the tension shaft to maintain tension and moves along the direction of the tension shaft;
The tension nut connection part,
a pulley concentric with the front through hole of the main body;
a chain engaged with the pulley to transfer the rotational force of the driving motor to the pulley; and
A tensioning device for a PHC pile comprising a nut insertion portion concentric with the pulley and having a nut insertion hole formed with an inner surface having the same shape as the outer circumferential surface of the tension nut so that the tension nut is inserted and fit snugly. .
According to claim 1,
Tensioning device for PHC pile, provided at the front end of the cylinder unit with a coupling chuck screwed with a male thread formed on a circumferential surface of the tension shaft.
According to claim 1 or 2,
A tensioning device for a PHC pile, wherein a fluid line is connected to the cylinder unit to operate by a working fluid.
delete According to claim 1,
The tension nut connection portion and the cylinder unit are located on the same axis as the tension shaft, the tensioning device for the PHC pile.

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