KR101717489B1 - Repair construction method of cracked PHC pile - Google Patents

Abstract

The present invention relates to a method for repairing a cracked PHC pile. The method for repairing a cracked PHC pile according to the present invention comprises: a separation step; a head portion organizing step; an extension installation step; a joint member preparation step; a joint member fixing step; and a reinforcing pile installing step, so a PHC pile inserted into the ground and a newly connected PHC pile are connected simply and firmly, thereby preventing bearing capacity from being deteriorated due to repair.

Description

Repair construction method of cracked PHC pile < RTI ID = 0.0 >

When a PHC file is damaged in the process of installing the PHC file, the PHC file is entirely removed or removed, and only the upper part of the damaged part is removed without reinstalling, and then a PHC file of a size large enough to correspond to the removed part is prepared The present invention relates to a method of repairing and installing a medium frequency PHC file, which can prevent an increase in construction cost and an increase in air due to the installation and removal of a PHC file already buried in the ground.

Generally, when constructing various civil engineering structures such as buildings, bridges, etc., steel pipe files should be buried in the ground layer to reinforce the weak ground, and the ends of the steel pipe piles to be buried should be closed. And concrete structures are constructed to support concrete civil / structural structures.

Nowadays, various kinds of special construction that have not been seen in the past are increasing due to the increase in the size of the structure, the increase in the size of the building, the increase in the land price, and the environmental problems.

In addition, construction and coastal construction in the soft ground, which had been neglected as a conventional construction site, became more active, and with the introduction of the seismic design method and the awareness of the safety of the structure, the file used for reinforcing the foundation structure has a deeper penetration depth And large bearing capacity.

Accordingly, a PHC file (PRETENSIONED SPUN HIGH STRENGTH CONCRETE PILES) has been put into practical use as a countermeasure against the intensification of a pre-tensioned concrete pile (hereinafter referred to as PC file) which is a concrete pile used in the past.

The PHC file is stipulated in the KS F4306 Pretensioned Centrifugal High Strength Concrete Pile of KS F4306. It is a high strength product with a concrete strength exceeding 78.5MPa (800kg / cm2). Currently, PHC file is used in most sites.

The PHC file has the advantage of using the high-strength concrete compared to the existing PC file, so that the design bearing capacity is greatly improved, the damage resistance is low due to the high impact resistance, and the economical construction design is possible.

On the other hand, the pile driving method is divided into the straight type and the straight type after the excavation. When the PHC pile is planted at 20 ~ 30m depth on the soft ground, the supporting ground is increased because of the compaction of the surrounding ground.

However, when the lower end of the PHC file is struck against an obstacle such as a rock placed in the ground in a process of directing the PHC file to the soft ground, the PHC file does not advance vertically but is warped slightly to one side.

The reason why the bending phenomenon occurs as described above is that the PHC pile is formed in a tubular shape so that the portion of the PHC pile which comes into contact with the rock is closely related to the edge portion of the PHC pile and has a wide and high ground pressure, There is a problem that this occurs.

That is, since the bottom edge of the PHC file serves as a bit, the center of the hollow part of the PHC file does not act as a center point, and when the user touches the gravel, clay layer, or rock,

Therefore, in the process of connecting the PHC file to the depth of 20 ~ 30m, the bending phenomenon and the breakage phenomenon easily occur due to the obstacle located in the ground.

In order to solve such a problem, "a bit for preventing bending of the pile" (Korean Patent Laid-Open Publication No. 10-2013-0015036, Patent Document 1) discloses that a bit having a special shape is provided under the pile, So as to improve the running stability and to prevent the file in the hitching process.

However, despite the development of the technology as in Patent Document 1, the PHC file is still bent, damaged, and propagated in many construction sites.

When such breakage occurs, the pulled PHC file is usually pulled out using a pulling device, and then the perforated part is filled, and then the pile ground is stabilized, and then the pile construction is performed again.

In this case, however, there is a problem that the construction period is greatly increased, and the withdrawn files are discarded, which increases the waste disposal cost.

KR 10-2013-0015036 (2013.02.13)

The method for repairing and installing the medium frequency PHC file of the present invention is to solve the problem caused by the conventional technology as described above. The upper part is separated from the upper part of the PHC file, And to increase the utilization rate of the resources by preventing the air delay due to the extraction of the already inserted PHC file.

In addition, the PHC file inserted in the ground and the newly connected PHC file are simply and firmly connected to each other so that the bearing capacity is not lowered due to maintenance.

In order to solve the above problems, a method for repairing a medium-frequency PHC file according to the present invention is characterized in that a hollow portion (2) is formed in the longitudinal direction thereof and a steel rod (4) A method of repairing and installing a medium wave file (1) damaged in the middle, comprising the steps of: separating an upper side portion of the medium wave file (1) with reference to a medium wave portion; A head cleaning step of arranging a head of the medium wave file 1 separated from the upper part and forming a protrusion 4a so that the steel bar 4 of the medium wave file 1 protrudes upward from the head; After the mold is installed around the head of the middle wave file 1 after the head cleaning process, the unshrinkable high strength mortar is injected into the mold and cured to form an extension part 5 extending integrally to the upper side of the middle wave file 1 A protrusion (4a) of the steel bar (4) protruding upward from the extension (5); A lower circular plate 11 having the same outer diameter as the middle wave file 1 and having a lower through hole 11a formed in a line with the projecting portion 4a of the steel rod 4 around the lower circular plate 11, An upper circular plate 12 provided at an upper portion of the lower circular plate 11 and having a plurality of upper through holes 12a formed therearound and a connecting member 13 connecting the upper circular plate 12 and the lower circular plate 11 A joint member preparing step of preparing a joint member (10); The joint member 10 is installed on the upper portion of the extension 5 so that the projecting portion 4a of the steel rod 4 is inserted into the lower through hole 11a of the lower circular plate 11 of the joint member 10 A jointing member fixing the joining member 10 to the extending portion 5 by fixing the protruding portion 4a of the steel bar 4 and the lower circular plate 11 around the lower through- step; A hollow bar 2 is formed in the same way as the medium wave file and a steel bar 4 is provided on a wall surface and a separate reinforcing pile 8 inserted with a nut 7 connected to the steel bar 4 The nut 7 is arranged so as to be in line with the position of the upper through hole 12a and then the bolt 9 is passed through the upper portion of the joint member 10, And a reinforcing pile installation step of fastening the reinforcing pile 8 to the upper original plate 12 by fastening the reinforcing pile 7 to the nut 7 while passing through the hole 12a.

A separating step of separating a portion on the upper side based on the medium wave portion in the medium wave file 1; A head cleaning step of arranging a head of the medium wave file 1 separated from the upper part and forming a protrusion 4a so that the steel bar 4 of the medium wave file 1 protrudes upward from the head; After the mold is installed around the head of the middle wave file 1 after the head cleaning process, the unshrinkable high strength mortar is injected into the mold and cured to form an extension part 5 extending integrally to the upper side of the middle wave file 1 A protrusion (4a) of the steel bar (4) protruding upward from the extension (5); A sealing member mounting step of mounting a sealing member 20 on the upper part of the extension part 5 such that the projecting part 4a of the steel bar 4 penetrates upward; The upper portion of the hole 31 has a constant inner diameter and a thread 31a is formed on the inner circumferential surface of the upper portion of the hole 31. The lower portion of the hole 31 gradually becomes the inner diameter And the protruding portion 4a of the steel bar 4 protruded above the sealing member 20 is inserted into the fastening hole 31b by preparing the outer fastener 30 having the fastening hole 31b of the shape An outer fixture mounting step; The inner fixture 40 is provided with an inner fixture 40 having an outer circumferential surface in the form of a wedge fitted into the fastening hole and having a steel through hole 41 through which the protruding portion 4a of the steel rod 4 penetrates, An inner fixture installing step of installing the steel bar 4 through the hole 31 of the outer fixture 30 downward from the top and installing the steel bar 4 protrusion 4a in the steel bar through hole 41; A tensile member 50 of a bar shape having threaded portions 51 coupled to the thread 31a of the hole 31 of the outer fixture 30 is prepared on the lower outer circumferential surface and the tensile member 50 is attached to the outer fixture 30 A tension member mounting step of screwing; After preparing a reinforcing pile 8 in which a hollow portion 2 is formed and a steel rod 4 is provided on the wall surface in the same manner as the medium wave file 1, (50).

The reinforcing pile 8 is inserted in the lower part with a nut member 7a connected to the steel bar 4. The reinforcing pile 8 has an insertion groove 7b at the bottom of the steel rod 4 inside the nut member 7 The upper end of the tensile member 50 is inserted into the insertion groove 7b in the step of installing the reinforcing pile and the threaded portion of the tension member 50 And the nut (80) is fastened to the outer peripheral surface to fix the reinforcing pawls (8) to the tension member (50).

Alternatively, the reinforcement pile 8 is inserted with a nut member 7a connected to the steel bar 4 at the bottom. An insertion groove 7b is formed at the bottom of the steel bar 4 in the nut member 7a, The upper end of the tension member 50 is inserted into the insertion groove 7a and the outer peripheral surface of the tension member 50 and the nut member 7a are welded and fixed in the step of installing the reinforcing pile, (50).

A lower circular plate 11 having the same outer diameter as the middle wave file 1 and having a lower through hole 11a formed in a line with the tension member 50 around the lower circular plate 11, And a connecting member 13 for connecting the upper circular plate 12 and the lower circular plate 11. The upper circular plate 12 has a plurality of upper through holes 12a formed at its upper portion, (10); The nut 60 and the washer 70 are installed on the upper and lower sides of the fitting portion so that the tension member 50 is fitted into the lower through hole 11a of the lower circular plate 11 of the joint member 10, And fixing the member (50) to the lower disk (11), wherein the step of installing the reinforcing pile includes the steps of forming a hollow part (2) inside the same as the medium wave file A reinforcing pile 8 is attached to the joint member 10 after preparing a reinforcing pile 8 in which a steel bar 4 is provided on the wall surface and a nut 7 connected to the steel rod 4 is inserted in the lower portion. And the nut 7 is disposed so as to be in line with the position of the upper through hole 12a and then fastened to the nut 7 through the upper through hole 12a with the bolt 9, (8) is fixed to the upper circular plate (12).

According to the present invention, the upper part of the PHC file is separated from the upper part of the PHC file, the lower part of the PHC file is rearranged, and the reinforced PHC file for the repair is manufactured and interconnected, It is possible to prevent delay and increase resource utilization rate.

In addition, since the already inserted PHC file and the newly connected PHC file are simply and firmly connected, the bearing capacity is not lowered due to maintenance.

1 is a cross-sectional view showing the state of a medium-wave PHC file.
2 is a cross-sectional view showing a state where a ground is excavated for file separation;
FIG. 3 is a cross-sectional view showing a state in which the upper portion of the middle-wave file is separated; FIG.
4 is a sectional view showing a state in which a head portion of a medium wave file is organized.
5 is a cross-sectional view showing an example in which an extended portion is formed on a head portion of a medium wave file;
6 is a cross-sectional view showing a state in which a coupling member is provided on a head portion of a medium-wave file;
7 is a cross-sectional view showing a state in which a reinforcing file is connected to a joint member.
8 is a cross-sectional view showing a state in which a sealing member and an outer fixing member are provided on an extension portion.
Fig. 9 is a sectional view showing a state in which the inner fastener is installed in the state of Fig. 8; Fig.
10 is a cross-sectional view showing a state in which a tension member is connected in the state of FIG. 9;
11 is a cross-sectional view showing a state in which a reinforcement file is connected to a tension member in the state of FIG. 10;
12 is a cross-sectional view showing a state in which a reinforcing pile is connected after a joint member is installed in a tension member in Fig.

The present invention relates to a PHC pile having a hollow portion 2 formed therein in the longitudinal direction and having a steel bar 4 formed along the periphery of the sidewall surface, 3), cut and the like, and the medium wave file 1 as shown in Fig. 1 is damaged.

Hereinafter, a method of repairing and installing a medium wave PHC file of the present invention will be described in detail with reference to the accompanying drawings.

1. Separation step

As shown in Fig. 3, the upper side portion of the medium wave file 1 is separated by a cutter or the like with reference to the medium wave portion.

At this time, it is preferable to excavate the periphery to the mid-wave part as shown in FIG. 2 according to the inserted condition of the medium wave file 1, thereby facilitating the cutting operation.

2. Tofu clearance stage

The upper part of the middle wave file 1 is separated by the cutting method or the like using a cutter or a grinder as shown in Figure 4 so that the steel rods 4 of the middle wave file 1 are projected to the upper side of the head 4a.

At this time, the concrete part is made as flat as possible as shown in the figure, and the protruded protruding parts 4a are arranged so that the lengths of the protruded parts 4a can be made uniform as a whole.

3. Steps to install the extension

After the mold is installed around the head of the middle wave file 1 after the head cleaning process, the non-shrinkage high strength mortar is injected into the mold and cured. Then, as shown in FIG. 5, (5).

At this time, the protruding portion 4a of the steel bar 4 protrudes upward from the extended portion 5.

The formation of the extension part 5 is often due to the breakage of the upper end of the medium wave file 1, such as a gap between the steel rod 4 and the concrete around the damaged part in the process of damaging the PHC file, So that the strength of the steel rods 4 and concrete can be prevented from being lowered by integrating them at the ends.

4. Preparations for joints

The coupling member 10 as shown in Fig. 6 is prepared.

The joint member 10 includes a lower circular plate 11, an upper circular plate 12, and a connecting member 13, which are firmly fixed to each other by a welding method.

Specifically, the lower disk 11 has the same outer diameter as the middle-wave file 1, and a lower through-hole 11a is formed along the periphery of the lower disk 11 so as to be in line with the projecting portion 4a of the steel rod 4.

The upper circular plate 12 is installed on the lower circular plate 11 and has a plurality of upper through holes 12a formed therearound.

At this time, the upper through-hole 12a may be straight in a direction perpendicular to the lower through-hole 11a, but is preferably staggered on the plane.

The connecting member 13 is a member for connecting the upper circular plate 12 and the lower circular plate 11 as shown in the drawing, and has a circular tube shape.

At this time, a plurality of reinforcing ribs may be formed on the outer circumferential surface of the connecting member 13 to increase the load bearing capacity.

5. Fixing step of joint members

The protruding portion 4a of the steel bar 4 is inserted into the lower through hole 11a of the lower circular plate 11 of the joint member 10 so that the joint member 10 is inserted into the extension portion 11a, (5).

Then, the protruding portion 4a of the steel bar 4 and the lower circular plate 11 around the lower through hole 11a are fixed by welding so that the joint member 10 is integrally fixed to the extending portion 5.

6 shows a welding portion 6 according to welding.

6. Steps to install a reinforcement file

7, a hollow portion 2 is formed in the same way as the middle wave file 1, and a steel rod 4 is provided on the wall surface, and a nut 7 connected to the steel rod 4 at the lower portion. A separate reinforcement file 8 is prepared.

The inner diameter of the upper portion of the nut 7 is smaller than the inner diameter of the lower portion and the diameter of the lower portion of the steel rod 4 is larger than that of the upper portion of the nut 7, It is preferable that the lower end portion is fitted in the inside of the recess.

In addition, the nut 7 has threads formed on its inner peripheral surface.

After the reinforcement file 8 is prepared, the reinforcement file 8 is installed on the joint member 10 so that the nut 7 is aligned with the position of the upper through-hole 12a, The reinforcing pawls 8 are fastened to the upper original plate 12 by fastening them to the nuts 7 while passing through the upper through holes 12a with the fastening pawls 9.

According to the repairing method, it is not necessary to separate the entire PHC file in which the damage occurs, so that the air can be remarkably shortened and the disposal of resources can be minimized.

In addition, since the additional reinforcing file 8 is firmly connected to the original file as close as possible to the middle-size file 1 where the upper side is separated due to the damage, structural defects deviating from the design plan can be prevented as much as possible .

However, file corruption may be an environment in which hacking is not finally achieved.

That is, an environment in which the reinforcement file 8 is connected after the reinforcement file 8 is connected as in the above-described embodiment may occur.

In this case, when the impact force applied to the reinforcement file 8 is transmitted to the lower middle wave file 1, it is concentratedly applied to the steel rods 4 of the middle wave file 1, particularly to the projecting portion 4a of the head side, There is a possibility that the extensions 5 formed in the mortar may be damaged and the file strength may be reduced accordingly.

In order to solve such a problem, the present invention may be implemented in the following embodiments.

Specifically,

1. Separation step

The upper side portion is separated based on the medium wave portion in the medium wave file 1 as in the first embodiment.

2. Tofu clearance stage

The upper portion of the middle wave file 1 is separated and the remaining portion of the middle wave file 1 is folded as shown in Embodiment 1 so that the projecting portion 4a is formed so that the steel bar 4 of the middle wave file 1 protrudes upward from the head.

3. Steps to install the extension

As shown in Example 1, a mold was installed around the head of the middle wave file (1) after completion of the head cleaning process, and a non-shrinkage high strength mortar was injected into the mold, The protruding portion 4a of the steel bar 4 protrudes upward from the extended portion 5. [

4. Steps for installing the sealing member

8, the sealing member 20 is installed on the upper portion of the extended portion 5 such that the projecting portion 4a of the steel rod 4 penetrates upward.

The sealing member 20 serves to prevent the groundwater from flowing into the gaps occurring between the upper reinforcing pile 8 and the lower middle pavement 1 when tensile force or pulling force acts to prevent corrosion of the steel rods .

5. Step of Installing the External Fixture

8, a hole 31 is formed at the center of the hole 31. The upper portion of the hole 31 has a predetermined inner diameter and a thread 31a formed on the inner circumferential surface thereof, The lower part of the lower part is provided with an outer fixture 30 having a fastening hole 31b whose inner diameter gradually decreases toward the lower end so that the projecting part 4a of the steel rod 4 protruded above the sealing member 20 is fastened to the fastening hole 31b.

6. Internal fastener mounting step

9, the outer circumferential surface has a wedge shape to be fitted in the fastening hole, and an inner fastener 40 having a steel through-hole 41 through which the projecting portion 4a of the steel rod 4 passes is formed therein The inner fixture 40 is installed through the hole 31 of the outer fixture 30 so as to be downward from the upper portion and the steel rod 4 protruding portion 4a is fitted to the steel pipe through hole 41.

At this time, it is preferable that the projecting portion 4a of the steel bar 4 has a gap such that the upper end thereof is located lower than the upper end surface of the inner fastener 40.

This is for the purpose of enabling the anti-pulling force transmitted through the tension member (50) to be indirectly transmitted without being directly transmitted to the steel bar (4).

7. Tension Member Installation Steps

10, a rod-like tensile member 50 having a thread 51 coupled to the thread 31a of the hole 31 of the outer fixture 30 is prepared on the lower outer circumferential surface, and the tensile member 50 ) To the outer fixture (30).

8. Steps to install a reinforcement file

As shown in Fig. 11, a reinforcing pile 8 having a hollow portion 2 formed therein and having a steel bar 4 on the wall thereof is prepared and reinforced similarly to the medium wave file 1, To connect the pile (8) to the tension member (50).

At this time, various methods can be applied to the reinforcement file installation step.

11, a nut member 7a connected to a steel bar 4 is inserted in a lower portion of the reinforcing pile 8, and the reinforcing pile 8 is inserted into a bottom portion of the steel bar 4 in the nut member 7, And the upper end of the tension member 50 is inserted into the insertion groove 7b in the step of installing the reinforcing pile, The nut 80 can be fastened to the outer peripheral surface of the member 50 to fix the reinforcing pawl 8 to the tension member 50. [

A nut member 7a connected to the steel bar 4 is inserted in the lower portion of the reinforcing pile 8 and an insertion groove 7b is formed in the bottom of the steel bar 4 inside the nut member 7a The upper end of the tension member 50 is inserted into the insertion groove 7a and the outer peripheral surface of the tension member 50 and the nut member 7a are welded and fixed to each other, May be fixed to the tension member (50).

11, an anti-buckling force transmitted from the middle-wave file 1 to the reinforcement pile 8 due to the provision of the outer fixture 30, the inner fixture 40 and the tension member 50 is transmitted to the tension member 50, The inner fixture 40 and the outer fixture 30 are uniformly dispersed and transmitted without being directly transmitted to the steel bar 4 while being transmitted through the steel bar 4, thereby reducing the possibility of damage to the extended portion 5. [

At this time, it is preferable that the reinforcing file 8 and the steel rods 4 of the middle-size wave file 1 are in a straight line, preferably in the embodiment of Fig.

That is, load transfer can be facilitated by transmitting the anti-striking force applied from the upper portion to the reinforcing pawl 8 downward without changing the angle in the vertical direction.

At this time, in the reinforcing file installation step, the outer fixture 30, the inner fixture 40, and the tension member 50 are utilized, and the joint member 10 shown in the first embodiment can be used together.

Specifically, as shown in Fig. 12

A lower circular plate 11 having the same outer diameter as the middle wave file 1 and having a lower through hole 11a formed in a line with the tension member 50 around the lower circular plate 11, And a connecting member 13 for connecting the upper circular plate 12 and the lower circular plate 11. The upper circular plate 12 is provided with a plurality of upper through holes 12a, Preparing a joint member;

The nut 60 and the washer 70 are installed on the upper and lower sides of the fitting portion so that the tension member 50 is fitted into the lower through hole 11a of the lower circular plate 11 of the joint member 10, And a fixing step of fixing the member (50) to the lower original plate (11)

The method of claim 1,

A hollow part 2 is formed in the interior of the middle wave file 1 and a steel rod 4 is provided on the wall surface and a nut 7 connected to the steel rod 4 is inserted in the lower part. The reinforcing file 8 is installed on the joint member 10 so that the nut 7 is arranged so as to be in line with the position of the upper through hole 12a, The reinforcing pawls 8 may be fastened to the nuts 7 through the upper through holes 12a to fix the reinforcing pawls 8 to the upper original plate 12. [

The system of FIG. 12 combines the advantages of the embodiment of FIG. 11 and the embodiment of FIG.

For example, the embodiment of FIG. 7 may cause a problem in load transfer at the time of hovering as described above.

On the other hand, the embodiment of FIG. 11 can prevent damage to the head of the medium wave file 1, which is desirable in terms of load transfer, but may cause problems when the reinforcement file 8 is not set to an accurate dimension.

That is, the exact depth of the medium wave file (1) inserted at the repair site, the measurement of the space required for connection with the reinforcement file (8), and the problem that the height is different from other installed PHC files There is a possibility.

On the other hand, in the embodiment of FIG. 12 described above, the height of the upper portion of the tension member 50 and the lower side of the joint member 10 can be adjusted in accordance with the adjustment of the penetration length of the tension member 50.

12, when the auxiliary connection pipe 90 is screwed into the upper end of the tension member 50 and the auxiliary connection pipe 90 is connected to support the bolt 9, It is possible to prevent breakage or damage at the connection portion when the anti-tying force is transmitted to the connection portion between the medium wave file 1 and the reinforcement file 8. [

In this case also, the steel rods of the two files can be arranged in a straight line.

Meanwhile, in the repair and construction method of the present invention constructed as described above, a steel pipe-like member (not shown) may be banded and fixed around the connecting portion of the medium wave file 1 and the reinforcing pile 8 to prevent groundwater inflow .

1: medium wave file 2: hollow part
3: crack 4: steel bar
4a: protruding portion 5: extending portion
6: weld 7: nut
7a: nut member 7b: insertion groove
8: Reinforcement file 9: Bolt
10: joint member 11: lower disk
11a: Lower through hole 12: Upper disc
12a: upper through hole 13: connecting member
20: sealing member 30: outer fastener
31: hole 31a: thread
31b: fastening hole 40: inner fastener
41: steel bar penetration hole 50: tensile member
51: thread 60: nut
70: Washer 80: Nut
90: auxiliary connector

Claims (5)

1. A method of repairing and installing a medium wave file (1) in which a hollow portion (2) is formed in the longitudinal direction inside and a steel rod (4) is formed along the side wall surface,
A separating step of separating the upper part based on the medium wave part in the medium wave file (1);
A head cleaning step of arranging a head of the medium wave file 1 separated from the upper part and forming a protrusion 4a so that the steel bar 4 of the medium wave file 1 protrudes upward from the head;
After the mold is installed around the head of the middle wave file 1 after the head cleaning process, the unshrinkable high strength mortar is injected into the mold and cured to form an extension part 5 extending integrally to the upper side of the middle wave file 1 A protrusion (4a) of the steel bar (4) protruding upward from the extension (5);
A lower circular plate 11 having the same outer diameter as the middle wave file 1 and having a lower through hole 11a formed in a line with the projecting portion 4a of the steel rod 4 around the lower circular plate 11, An upper circular plate 12 provided at an upper portion of the lower circular plate 11 and having a plurality of upper through holes 12a formed therearound and a connecting member 13 connecting the upper circular plate 12 and the lower circular plate 11 A joint member preparing step of preparing a joint member (10);
The joint member 10 is installed on the upper portion of the extension 5 so that the projecting portion 4a of the steel rod 4 is inserted into the lower through hole 11a of the lower circular plate 11 of the joint member 10 A jointing member fixing the joining member 10 to the extending portion 5 by fixing the protruding portion 4a of the steel bar 4 and the lower circular plate 11 around the lower through- step;
A hollow bar 2 is formed in the same way as the medium wave file and a steel bar 4 is provided on a wall surface and a separate reinforcing pile 8 inserted with a nut 7 connected to the steel bar 4 The nut 7 is arranged so as to be in line with the position of the upper through hole 12a and then the bolt 9 is passed through the upper portion of the joint member 10, And a reinforcing-file mounting step of fastening the reinforcing pile (8) to the upper original plate (12) by fastening to the nut (7) while passing through the hole (12a)
Maintenance method of medium wave PHC file.
1. A method of repairing and installing a medium wave file (1) in which a hollow portion (2) is formed in the longitudinal direction inside and a steel rod (4) is formed along the side wall surface,
A separating step of separating the upper part based on the medium wave part in the medium wave file (1);
A head cleaning step of arranging a head of the medium wave file 1 separated from the upper part and forming a protrusion 4a so that the steel bar 4 of the medium wave file 1 protrudes upward from the head;
After the mold is installed around the head of the middle wave file 1 after the head cleaning process, the unshrinkable high strength mortar is injected into the mold and cured to form an extension part 5 extending integrally to the upper side of the middle wave file 1 A protrusion (4a) of the steel bar (4) protruding upward from the extension (5);
A sealing member mounting step of mounting a sealing member 20 on the upper part of the extension part 5 such that the projecting part 4a of the steel bar 4 penetrates upward;
The upper portion of the hole 31 has a constant inner diameter and a thread 31a is formed on the inner circumferential surface of the hole 31. The lower portion of the hole 31 gradually extends toward the lower end, And the protruding portion 4a of the steel bar 4 protruded above the sealing member 20 is inserted into the fastening hole 31b by preparing the outer fastener 30 having the fastening hole 31b of the shape An outer fixture mounting step;
The inner fixture 40 is provided with an inner fixture 40 having an outer circumferential surface in the form of a wedge fitted into the fastening hole and having a steel through hole 41 through which the protruding portion 4a of the steel rod 4 penetrates, An inner fixture installing step of installing the steel bar 4 through the hole 31 of the outer fixture 30 downward from the top and installing the steel bar 4 protrusion 4a in the steel bar through hole 41;
A tensile member 50 of a bar shape having threaded portions 51 coupled to the thread 31a of the hole 31 of the outer fixture 30 is prepared on the lower outer circumferential surface and the tensile member 50 is attached to the outer fixture 30 A tension member mounting step of screwing;
After preparing a reinforcing pile 8 in which a hollow portion 2 is formed and a steel rod 4 is provided on the wall surface in the same manner as the medium wave file 1, And a reinforcing-file installing step of connecting the reinforcing-
Maintenance method of medium wave PHC file.
3. The method of claim 2,
The reinforcing pile (8) is inserted with a nut member (7a) connected to a steel bar (4)
An insertion groove 7b is formed in the bottom of the steel bar 4 inside the nut member 7,
A thread is formed on the outer peripheral surface of the upper portion of the tensile member 50,
The upper end of the tension member 50 is inserted into the insertion groove 7b and the nut 80 is fastened to the outer circumferential surface of the tension member 50 in the step of installing the reinforcing pile, Is fixed to the base
Maintenance method of medium wave PHC file.
3. The method of claim 2,
The reinforcing pile (8) is inserted with a nut member (7a) connected to a steel bar (4)
Inside the nut member 7a, an insertion groove 7b is formed at the bottom of the steel bar 4,
The upper end of the tension member 50 is inserted into the insertion groove 7b and the outer circumferential surface of the tension member 50 and the nut member 7a are welded and fixed, (50). ≪ RTI ID = 0.0 >
Maintenance method of medium wave PHC file.

3. The method of claim 2,
A lower circular plate 11 having the same outer diameter as the middle wave file 1 and having a lower through hole 11a formed in a line with the tension member 50 around the lower circular plate 11, And a connecting member 13 for connecting the upper circular plate 12 and the lower circular plate 11. The upper circular plate 12 is provided with a plurality of upper through holes 12a, Preparing a joint member;
A nut 60 and a washer 70 are provided on upper and lower sides of a portion of the lower circular plate 11 of the joint member 10 fitted in the lower through hole 11a so as to fit the tension member 50, (50) is fixed to the lower original plate (11)
The method of claim 1,
A hollow part 2 is formed in the interior of the middle wave file 1 and a steel rod 4 is provided on the wall surface and a nut 7 connected to the steel rod 4 is inserted in the lower part. The reinforcing file 8 is installed on the joint member 10 so that the nut 7 is arranged so as to be in line with the position of the upper through hole 12a, Is fastened to the nut (7) while passing through the upper through hole (12a) to fix the reinforcement pile (8) to the upper original plate (12)
Maintenance method of medium wave PHC file.

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