KR20180125737A - Tip Strengthening Apparatus for PHC - Google Patents

Abstract

The present invention relates to a tip strengthening apparatus for a PHC pile. The tip strengthening apparatus for a PHC pile according to the present invention includes: a plurality of connection units (10) which comprises a plurality of outer side wall parts (11) spaced apart from each other, connection side wall parts (12) integrated to both ends of each outer side wall part (11), an inner side wall part (13) placed between outer side wall parts (11) adjacent to each other, and a cover part (14) having a bolt coupling hole (14a), wherein an inward space (15) is surrounded by the outer side wall part (11) and the connection side wall part (12), and an outward space (16) is surrounded by the inner side wall part (13) and the connection side wall part (12), and wherein the PHC pile (1) is divided equally, an end portion is finished by a first connection side wall part (12a) connected with the outer side wall part (11), and the other end portion is finished by a second connection side wall part (12b) connected with the inner side wall part (13); a side bolt (20) for connecting the neighboring connection units (10) with each other; and an upper bolt (30) for fixing the connection units (10) to the PHC pile (1). The tip strengthening apparatus for a PHC pile according to the present invention can reduce construction costs and reduce a construction period of time due to its simple assembly performance.

Description

PHC file tip reinforcement {Tip Strengthening Apparatus for PHC}

The present invention relates to a PHC pile tip reinforcement mechanism mounted on the tip of a file, such as a PHC file, for enhancing the comfort of putting a foot, and a plurality of units are assembled by assembling by bolting to improve assembly accuracy, The present invention relates to a PHC file end reinforcement mechanism.

Generally, concrete pile foundation construction method is classified into PHC pile method which uses piles manufactured in factories to be transported to the site, and field pile pile method which is constructed by constructing piles directly in the field.

Among them, the PHC pile method is a method in which a PHC pile is installed by directly mounting a PHC pile on a ground, and a cement milk is poured into a perforated hole excavated using a screw auger, And PHC pile curing method after curing after putting a foot on the head of PHC pile with hammer. These methods are appropriately selected according to the situation or use of each construction site.

Here, the hinge PHC pile method is divided into a PHC pile direct hitting method and a straight hitting method after pre-drilling. Such a direct PHC pile piercing method penetrates a loose ground due to the striking energy of a PHC pile, Although it is advantageous to increase the supporting force by penetrating into the paper board, it is difficult to use in the urban areas and housing areas where the adjacent buildings are close to each other due to the strong noise and vibration generated during the construction due to strong impact And the like.

Recently, in order to solve the problem of noise and vibration occurring during the construction of PHC pile, most PHC piles have been used.

The PHC pile method can be applied to a PHC pile in a low noise and low vibration state as compared with the hanger PHC pile method. On the other hand, a slime remains in the bottom of the piercing hole during excavation of the piercing hole by a drilling rig such as a screw auger The strength of PHC pile is lower than that of the ground due to the stress relaxation. The PHC pile is weakened when the pile is fixed within the range of slime and soil relaxation. In order to secure the economical efficiency in terms of the construction cost, it is important to improve the bearing capacity of the PHC pile by firmly penetrating the slime layer and fixing the tip of the pile to the ground.

In order to improve the bearing capacity of the embedded PHC pile, an insertion pipe for supporting layer penetration was installed at the tip of the embedded PHC pile at the beginning.

In the construction using this method, a perforation hole is drilled in the ground with a screw auger, etc., and the cement milk is injected into the perforated hole thus drilled. Then, the insertion tube is inserted downward into the perforation hole, The insertion tube penetrates the slime bottom and penetrates into the hard base support layer to improve the tip end supporting force.

In the case of such a conventional embedded pile, a perforation hole is formed in the ground using a drilling rig such as a screw auger, cement milk is injected into the perforation hole, and the inserted tube is inserted downward into the perforation hole The bar, the weighted pile, falls vertically into the bottom of the perforated hole without any resistance, and then performs the putt.

In this case, since the diameter of the insertion tube is formed to be the same or similar to the diameter of the pile, the volume and weight of the insertion tube are large, which is disadvantageous to manufacture and transportation. When the pile is assembled with the pile, The operator has to perform the bolting work inside the insertion tube having the screw hole.

In addition, when the bolt holes are not precisely aligned due to the difference in material between the lower part of the PHC file and the bolt assembly of the end reinforcement mechanism, such as a slight change in the manufacturing process and a variation due to a difference in temperature expansion, There was also a problem.

In addition, since the insertion tube is a heavy material and has a certain depth, it is difficult to assemble the insertion tube and the simple bolt fastening assembly for one person, so that it is required to be supported by the small backhoe equipment, There was also a problem of poor sex.

As a technique for solving such a problem, "a composite pile having an implant file for enhancing the penetration of the sole and improving the tip end supporting force" (Korean Patent Registration No. 10-1618632, Patent Document 1) As shown in Fig.

In the case of Patent Document 1, since the respective members are separated from each other, there is an advantage that the tip reinforcing mechanism can be easily formed in the PHC file of various sizes and sizes.

However, in the case of Patent Document 1, since the independent rod-like members are subjected to the loads, and the loads can not be transmitted to each other, the impact loads transmitted to the rods are directly transferred to the PHC file. There is a problem in that the file is damaged.

Another technique is disclosed in Korean Patent Laid-open Publication No. 10-2016-0025260 (Patent Document 2), which discloses a composite pile having a tip supporting force enhanced and a method of constructing the same, A structure in which a wavy end reinforcing member is connected is shown.

However, in the case of Patent Document 2, since the volume of the stiffening mechanism is substantially the same as the outer diameter of the file, it is difficult to carry the stiffener. Especially, in the process of assembling the stiffener at the bottom of the PHC file, There is a problem that it is difficult to install without the help of a mechanism such as a crane.

KR 10-1618632 (2016.04.29) KR 10-2016-0025260 (2016.03.08)

The PHC pile end reinforcement mechanism of the present invention is intended to solve the problems caused by the conventional art as described above. It can be installed while minimizing the help of the equipment in the process of connecting the pile end to the pile, So that the air can be shortened.

In addition, it is made of cast steel or cast steel and has a wavy shape to exhibit high strength and excellent in ductability, while at the upper part, only the part for bolt fastening is taken as a plate, and the other part is made as an empty space, And to provide a tip reinforcement mechanism having maximized convenience in transportation and assembly.

In addition, by making the connecting side wall portion and the inner side wall portion have a tapered shape, it is possible to enhance the putting ability of the putter in the inner side space of the outer side wall portion as well as the outer side wall portion.

In addition, the PHC file and the bolt fastening hole for bolt fastening are formed in a rectangular slit shape, so that the fastening hole can be easily assembled even in a fine construction error environment.

In addition, by securing the bolt for pressing the bolt head to the connecting side wall part, the bolt connected to the PHC file is prevented from being separated, so that the supporting force of the end reinforcing mechanism firmly embedded in the rock can be maintained in the PHC file .

In order to solve the above-mentioned problems, the PHC file tip end reinforcing mechanism of the present invention includes a plurality of outer side wall portions 11 formed to have the same outer surface as the outer diameter of the PHC pile 1 and spaced from each other, A connection side wall portion 12 formed integrally with both ends of the side wall portion 12 toward the center and an inner side wall portion 12 connecting the inner side ends of the connection side wall portions 12 between the adjacent outer side wall portions 11 And the bolt fastening holes 14a are formed integrally with the upper ends of the connecting side wall portions 12 on both sides of the inner side wall portion 13 and the inner side wall portion 13 And an inner space 15 surrounded by the outer sidewall part 11 and the connecting sidewall part 12 and an inner space 15 surrounded by the inner sidewall part 13 and the connecting sidewall part 12 And the PHC file 1 is formed in an equally divided shape, and one end portion The first connection sidewall part 12a connected to the first sidewall part 11 and the second connection sidewall part 12b connected to the inner sidewall part 13, A plurality of connecting units 10 having a first side bolt fastening hole 12c and a second side bolt fastening hole 12d having the same radius are formed on the first connecting side wall part 12a and the second connecting side wall part 12b; A lateral bolt 20 fastened through the first side bolt fastening hole 12c and the second side bolt fastening hole 12d of the adjacent connecting units 10 to interconnect adjacent connecting units 10; And an upper bolt 30 fixing the connection unit 10 to the PHC file 1 through the bolt fastening hole 14a.

In the above-described configuration, the connecting side wall portion 12 is formed of an inclined portion 12e whose lower end is inclined upward from the outside toward the center side.

The inner side wall part 13 is formed with a lower projection part 13a protruding downward to a point where the slope part 12e is connected. The downward projection part 13a is formed thicker than the upper part, And a tapered portion 13b that is inclined downward toward the center side is formed in the center portion.

Further, the bolt fastening holes 14a are formed in a rectangular slit shape toward the center of the PHC pile 1.

The connection side wall portion 12 is formed with a press bolt fastening hole 12f which penetrates in the horizontal direction and the end portion or the outer circumferential surface of the fastening bolt fastening hole 12f passes through the upper bolt (30) is provided with a pressing bolt (40) for pressing the bolt head.

According to the present invention, since the tip reinforcing mechanism is constructed as a prefabricated structure, it can be installed while minimizing the help of the equipment in the process of connecting to a file, so that the construction cost can be reduced and the assembly can be simplified and the air can be shortened.

In addition, it is made of cast steel or cast steel and has a wavy shape to exhibit high strength and excellent in ductability, while at the upper part, only the part for bolt fastening is taken as a plate, and the other part is made as an empty space, A tip end reinforcement mechanism with maximized transportation and assembling convenience is provided.

In addition, by making the connecting side wall portion and the inner side wall portion have a tapered shape, it is possible to enhance the putting performance in the inner side space of the outer side wall portion as well as the outer side wall portion.

In addition, the PHC file and the bolt fastening hole for bolt fastening are formed in the shape of a rectangular slit, so that the fastening hole can be easily assembled even in a fine construction error environment.

In addition, since the bolts for pressing the bolt head are fastened to the connecting side wall portion, the bolts connected to the PHC pile can be prevented from being separated from each other, so that the supporting force of the front end reinforcing mechanism firmly embedded in the rock can be maintained in the PHC pile.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an assembled state of a PHC file tip reinforcing mechanism and a PHC file of the present invention. FIG.
2 is a plan view showing a PHC pile tip reinforcement mechanism of the present invention.
3 is a cross-sectional side view of one side of a PHC pile tip reinforcement mechanism of the present invention.
4 is a cross-sectional side view of the PHC pile tip reinforcement mechanism according to the present invention on the other side.
5 is a perspective view showing an example in which the connecting side wall portion is inclined in the present invention.
6 is a perspective view showing an example in which the inner sidewall portion is formed thick and inclined according to the present invention.
7 is a view showing a configuration in which a pressure bolt is further included in the present invention.

The present invention relates to a PHC pile end reinforcement mechanism which is fastened to the tip of a PHC file (1) and can be penetrated into a hard ground such as a rock in a soaking process after filling.

1, a PHC file 1 for this purpose has a bolt fastening hole 1a formed at a lower portion thereof as shown in FIG. 1 like a normal PHC file. Through the bolt fastening hole 1a, Respectively.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

The PHC pile front end reinforcing mechanism of the present invention includes a plurality of connecting units 10, a lateral bolt 20 for fixing the connecting units 10 to each other, and an upper bolt 30 for fixing the connecting unit 10 to the PHC file 1 ).

The connecting unit 10, which is a component of the present invention, is made of a high strength material such as cast steel or cast steel. As shown in Figs. 1 and 2, the connecting unit 10 is divided into a plurality of PHC piles 1 Shaped to be assembled by being brought into contact with each other.

The connecting unit 10 includes an outer side wall portion 11, a connecting side wall portion 12, an inner side wall portion 13, and a lid portion 14 .

The outer sidewall portions 11 are spaced apart from one another for each connection unit 10 and are made of a plurality of at least two or more.

Specifically, the outer circumferential surface is formed to be equal to the outer diameter of the PHC file 1 with respect to the center of the PHC file 1.

The connecting side wall portion 12 is integrally connected to both ends of each of the outer side wall portions 11 and is formed toward the center.

The inner side wall portion 13 is located between the adjacent outer side wall portions 11 connecting the inner side ends of the connecting side wall portions 12 to each other.

The lid portion 14 is integrally connected to the upper ends of the connecting side wall portions 12 on both sides of the inner side wall portion 13 and the inner side wall portion 13 and has a bolt fastening hole 14a.

Although the bolt fastening hole 14a may be circular, it is preferable that the bolt fastening hole 14a is formed in the shape of a rectangular slit toward the center of the PHC file 1 as shown in the figure.

This is due to various environmental factors such as errors in the construction process, minute differences due to the difference in temperature expansion depending on the difference in material between the pile 1 of the concrete material and the connecting unit 10 made of the steel, The bolt fastening position can be finely adjusted along the slit even when a straight line can not be taken with the fastening hole 1a.

The connecting unit 10 constructed as described above has the inner side wall portion 13 and the outer side wall portion 11 formed alternately with reference to the connecting side wall portion 12, An inwardly directed space 15 surrounded by the connecting side wall portion 12 and an outwardly directed space 16 surrounded by the inner side wall portion 13 and the connecting side wall portion 12 are formed.

One end of the connection unit 10 is connected to the first connection sidewall 12a connected to the outer sidewall 11 and the other end is connected to the second sidewall 13 connected to the inner sidewall 13, And closed by the side wall portion 12b.

The first connecting side wall portion 12a and the second connecting side wall portion 12b are respectively provided with a first side bolt fastening hole 12c and a second side bolt fastening hole 12c having the same radius with respect to the center of the PHC file 1, And a hole 12d is formed.

Side bolt 20 as a constituent element of the present invention has a first side bolt fastening hole 12c and a second side bolt fastening hole 12d of adjacent connecting units 10 as shown in Figures 1 and 2, So that the adjacent connecting units 10 are interconnected.

At this time, the nut 21 is fastened to the opposite side of the head bolt 20 as shown in FIG.

As shown in FIG. 1, the upper bolt 30, which is a component of the present invention, passes through the bolt fastening hole 14a and the bolt fastening hole 1a in a straight line, And fixed to the PHC file (1).

3 and 4 show a cross-sectional structure in a state in which the PHC file 1 reinforcing mechanism of the present invention is fastened to the PHC file 1 in the above-described configuration.

3 is a side sectional view of the inner side wall portion 13 side, and FIG. 4 is a side sectional view of the outer side wall portion 11 side.

3, the upper bolt 30 is screwed into the bolt fastening hole 1a of the PHC pile 1 through the bolt fastening hole 14a of the lid portion 14, 1). ≪ / RTI >

At this time, the inner side wall portion 13 is impinged against the hard rock in the process of putting on.

In addition, the outer side wall portion 11 of FIG. 4 is also impinged on the hard rock in the course of the putting process.

3 and 4, the outer side wall portion 11, the inner side wall portion 13, and the connecting side wall portion 12 all have the same bottom height, so that the outer side wall portion 11, the connecting side wall portion 12,

Since the PHC file 1 has a hollow space formed therein and the inward space 15 is in communication with the hollow space of the file 1, The crushed material such as the crushed rock mass flows into the hollow space without any resistance. However, in the case of the outward facing space 16, the crushed material is completely blocked by the wall of the perforation hole, A relatively large impact load is applied to the lower end of the lid portion 14 and the peripheral portion thereof.

In order to solve this problem, as shown in FIG. 5, the connecting side wall part 12 may be composed of an inclined part 12e whose lower end is inclined upward from the outside toward the center side.

In this structure, the upper and lower end lengths of the inner side wall portion 13 are shorter than the upper and lower end lengths of the outer side wall portion 11.

In this configuration, if the bottom portion has a nonuniform cross-sectional shape and the penetration surface is flat, a space may be formed in the lower portion of the inclined portion 12e to induce the impurities to flow into the space.

In addition, the penetration can be made easier because the shape of the outline is entirely taken as a whole.

However, since the height of the lower end of the inner side wall portion 13 is low, there is a problem that the impact load is concentrated on the outer side wall portion 11 side.

In order to solve such a problem, a structure as shown in FIG. 6 can be suggested.

The structure of FIG. 6 has an inclined portion 12e, and the inner side wall portion 13 has a lower protrusion 13a protruding downward to a point where the inclined portion 12e is connected.

Here, it is preferable that the lower end of the lower projection 13a is formed in the same horizontal plane as the lower end of the outer side wall part 11. [

In addition, the downward protruding portion 13a is formed thicker than the upper portion, and the downward protruding portion 13a is formed with a tapered portion 13b which is downwardly inclined downward toward the center.

In this structure, a tapered portion 13b having an inclined cross-sectional shape is formed in the lower portion of the inner side wall portion 13, and the thickness of the tapered portion 13b is made larger than the upper thickness so that the possibility of breakage by impact is reduced, In addition, a gap 13c is formed in the lower portion of the inclined portion 12e, so that the resistance of the crushed materials can be reduced.

At this time, the thickness of the lower protruding portion 13a is made thicker without increasing the thickness of the entire inner side wall portion 13 in order to minimize the weight of each connecting unit 10 so that lifting by gravity is possible.

Meanwhile, in the above-described configuration, when the upward bolt 30 screwed through the bolt fastening holes 1a and 14a is loosened, the supporting force due to the intrusion of the reinforcing mechanism of the present invention into the rock is not fully transmitted to the file 1 A problem that can not be solved can occur.

In order to prevent such a problem, as shown in FIG. 7, a press bolt 40 may be additionally included.

In this configuration, a press bolt fastening hole 12f is formed in the connecting side wall portion 12 in a horizontal direction. Any part of the end or outer circumferential surface of the fastening bolt fastening hole 12f may be inserted through the bolt fastening hole 12f, And a pressing bolt 40 for pressing the bolt head 31 of the bolt 30.

The reason for positioning the pressing bolt 40 on both sides with respect to the upper bolt 30 is as follows.

In the embodiment shown in FIG. 1, since the adjacent connecting side wall portions 12 do not form a parallel state and take a straight line toward the center of the pile 1, the distance between the center side and the side of the pile 1 gradually becomes shorter than that of the outer side do.

Therefore, when the pressing bolt 40 is fastened to either one of the connecting side wall portions 12, the pressing bolt 40 is fastened in an oblique direction, not perpendicular to the axial center of the upper bolt 30. [

Further, since the bolt head 31 of the conventional hexagonal bolt is not uniform and has an angular shape, the end portion of the bolt 40 does not come into contact with the flat surface.

Furthermore, the bolt fastening hole 14a may have a rectangular slit shape as described above, and the fastening position may be adjusted.

For this reason, the press bolt 40 can be positioned eccentrically and not in a straight line with respect to the center of the upward bolt 30.

However, in this case, when the pressing bolt 40 presses the opposite side of the rotation direction in which the upward bolt 30 is fixed, the upward bolt 30 may be loosened by the pressing.

For this reason, when the two pressing bolts 40 are disposed in the direction facing each other, it is visually confirmed whether the upward bolt 30 is pressed in the unwinding direction or in the tightening direction by the operation of the pressing bolt 40 Any one of the pressing bolts 40 can be effectively used to achieve a satisfactory pressurization.

When the pressing of the pressing bolt 40 is finished, the end of the pressing bolt 40 or the outer circumferential surface of the pressing bolt 40 is brought into close contact with the upward bolt 30, thereby preventing the upward bolt 30 from being loosened.

Further, by using the pressing bolt 40, an effective zero point adjustment can be performed during the assembly process.

Specifically, in connecting the connection units 10 to the file 1, the upward bolts 30 are loosely tightened to temporarily fix the connection units 10 to the lower portion of the file 1, However, even if the upward bolt 30 is in the outward facing space 16, the bolt head 31 must be tightly fastened to the lower part of the lid 14, which is not easy to rotate.

Especially, it is necessary to tighten with the maximum force at the final closing time, but it is difficult to work because the space for using the tool is narrow.

In contrast, when the press bolt 40 is used, the upper bolt 30 is tightened to a certain level and then the press bolt 40 is loosened or tightened, Can be prevented.

The above-described installation example of the PHC file front end reinforcement mechanism of the present invention connects each connection unit 10 to the lower end of the PHC file suspended in a standstill state or the like, via the upward bolts 30, The adjacent connecting units 10 are easily installed in the PHC file by connecting to each other via the lateral bolts 20. [

In the embodiment in which the press bolt 40 is provided, the upward bolt 30 is tightened in a fastening process or in a fully fastened state, thereby preventing the bolt 30 from being loosened.

Thereafter, the end effector of the present invention is penetrated into the rock-type ground by performing a putter using a hanger or the like, so that a strong supporting force can be exerted.

Such a construction method can be installed while minimizing the help of the equipment in the process of connecting the file to the file because the end reinforcement mechanism is constructed as a prefabricated structure, so that the construction cost can be reduced and the assembly can be simplified and the air can be shortened.

It is also possible to minimize the use of such a device because the cover portion has a minimum portion for bolt fastening unlike the conventional one.

Also, in the embodiment in which the connecting sidewall portion and the inner sidewall portion are formed in a tapered shape, it is possible to increase the penetration of the putt in the inner space of the outer side wall portion as well as the outer side wall portion, and the resistance by the crushed material can be reduced to minimize the damage.

In addition, the PHC file and the bolt fastening hole for fastening the bolt are formed in a rectangular slit shape, so that the fastening bolt for pressing the bolt head is fastened to the connecting side wall part, So that the supporting force of the end reinforcing mechanism, which is firmly embedded in the rock, can be maintained in the PHC pile.

1: File 1a: Bolt tightening hole
10: connecting unit 11: outer side wall part
12: connecting side wall part 12a: first connecting side wall part
12b: second connecting side wall portion 12c: first side bolt fastening hole
12d: second side bolt fastening hole 12e:
12f: press bolt fastening hole 13: inner side wall part
13a: downward projecting portion 13b: tapered portion
13c: clearance 14: lid portion
14a: bolt fastening hole 15: inward direction space
16: outward space 20: lateral bolt
21: nut 30: upper bolt
31: bolt head 40: pressure bolt

Claims (5)

In the PHC pile end reinforcement mechanism,
A plurality of outer side wall portions 11 formed on the outer circumferential surface of the PHC pile 1 so as to have the same outer diameter as the outer diameter of the PHC pile 1 and spaced apart from each other, An inner side wall portion 13 which is located between the adjacent outer side wall portions 11 and connects the inner side ends of the connecting side wall portions 12 with each other; And a lid part 14 formed integrally with the upper end of the connecting side wall part 12 on both sides of the side wall part 13 and formed with a bolt fastening hole 14a and connected to the outer side wall part 11 An inwardly directed space 15 surrounded by the side wall portion 12 and an outwardly directed space 16 surrounded by the inner side wall portion 13 and the connecting side wall portion 12 are formed and the PHC file 1 is divided into equal parts One end portion of which is closed by a first connecting side wall portion 12a connected to the outer side wall portion 11, And the first connection side wall portion 12a and the second connection side wall portion 12b are respectively formed with first side bolt fastening holes 12c ) And a second side bolt fastening hole (12d) are formed;
A lateral bolt 20 fastened through the first side bolt fastening hole 12c and the second side bolt fastening hole 12d of the adjacent connecting units 10 to interconnect adjacent connecting units 10;
And an upper bolt (30) for fixing the connecting unit (10) to the PHC file (1) through the bolt fastening hole (14a).
PHC file tip reinforcement.
The method according to claim 1,
Characterized in that the connecting side wall part (12) is composed of an inclined part (12e) whose lower end is inclined upwards from the outside to the center side.
PHC file tip reinforcement.
3. The method of claim 2,
The inner side wall part 13 is formed with a lower projection part 13a protruding downward to a point where the slope part 12e is connected. The downward projection part 13a is thicker than the upper part, And a tapered portion (13b) inclined downward toward the side of the tapered portion
PHC file tip reinforcement.
3. The method according to any one of claims 1 to 2,
Wherein the bolt fastening hole (14a) is formed in a rectangular slit shape toward the center of the PHC pile (1)
PHC file tip reinforcement.
3. The method according to any one of claims 1 to 2,
The connection side wall portion 12 is formed with a press bolt fastening hole 12f which penetrates in the horizontal direction,
Characterized in that a press bolt (40) penetrates the press bolt fastening hole (12f) and either the end or the outer circumferential surface presses the bolt head of the upper bolt (30).
PHC file tip reinforcement.

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