JP4660502B2 - Repair method of handrail support - Google Patents

Description

  The present invention relates to a repair method for a handrail post that restores a corroded handrail post to its original shape. This handrail post is adapted to, for example, a handrail post installed on a veranda of an existing apartment or house, or a handrail post of a bridge.

  Generally, a veranda is installed in a condominium or an apartment house, and a handrail post is arranged on the veranda to prevent danger. As shown in FIG. 1, the handrail support column 1 usually extends in a horizontal direction from a square columnar or cylindrical body column 3 standing from a floor surface (parapet) 2 of a veranda and the body column 3. A handrail 7 and a lower beam member 8 are provided. Since the handrail support 1 is installed outdoors, it is likely to be aged and corroded due to the influence of rainwater, fatigue due to strong winds, and the like. Many portions are corroded at portions extending upward from the base portion of the main body column 3.

  In recent years, the safety of equipment is often questioned in condominiums and apartment houses, and investigations have also been conducted on handrail posts of condominiums. According to this, the main body pillar corroded from the root part has reached about 35-40%. In the case of repairing the main column, since it is too expensive to replace the entire column, a repair method that can be repaired at a low cost and in a short period of time has been desired.

Conventionally, Patent Document 1 discloses a repair method that is inexpensive and can be repaired in a short time. According to this, the handrail support column is formed of a hollow member tube, and since it has been exposed to wind and rain for many years, it is often aged and corroded. If rainwater enters from the corroded portion and accumulates in the pipe, the corrosion further proceeds. Therefore, in Patent Document 1, a hole having a predetermined size is drilled at the base of the hollow support column, and after draining the water in the pipe, a curable resin is injected from the drilled hole for reinforcement. ing. As a result, it was possible to perform repair work at a low cost and in a short period of time.
JP 2005-213740 A

  However, although the repairing method shown in Patent Document 1 is reinforced by injecting a curable resin into the pipe, it does not remove the corroded portion of the hollow member. In the case where the degree of corrosion is large, there is a possibility that the corroded portion exposed to rainwater after repairing further proceeds to further corrode to other unreinforced portions. Therefore, the durability after repair was also affected.

The present invention solves the above-mentioned problems, and provides a repair method for a handrail strut that can remove a corroded portion completely and prolong its service life and repair it at a low cost in a short period of time when the degree of corrosion is large. For this purpose, the following is performed. That is,
The invention according to claim 1 is a repair method for a handrail strut for repairing an existing handrail strut that has been partially corroded, and the corroded portion of the strut is cut and removed, and is removed at the cutting site. Reinforcement members that weld and join the upper struts that are not connected to the base plate embedded in the ground, and two divided connection plates are installed, and each of the two divided connection plates is fitted with welded attachment plates In addition, each attachment plate is arranged so as to protrude from the respective connection plate to the upper support column, and one attachment plate is arranged to protrude toward the other connection plate, and each connection plate is inserted into the cutting site. In this state, the mating surfaces of the connection plates, the connection plates and the upper support column, and the connection plates and the ground are welded. By coupling, it is characterized in that to enable holding the same intensity and the support at the time of new construction.

The invention according to claim 2 is a repair method for a handrail strut for repairing an existing handrail strut that has been partially corroded. The corroded portion of the strut is cut and removed, and is removed at the cutting site. A threaded deformed reinforcing bar that joins the unsupported upper strut and the concrete anchor driven into the ground , and a two-divided connecting plate that is inserted below the upper strut are installed. , The welded joint plate is internally fitted, and each of the support plates is disposed so as to protrude from the respective connection plate to the upper support column, and one of the support plates is disposed to protrude toward the other connection plate, With the connecting plate inserted into the cutting site, the mating surface of each connecting plate, between each connecting plate and the upper column, and respectively By welding between the connection plate and the ground, and is characterized in that to enable holding the same intensity and the support at the time of new construction.

  The invention according to claim 3 is a repair method for a handrail strut that repairs an existing handrail strut that has been partially corroded. The corroded portion of the strut is cut and removed, and is removed at the cutting site. Reinforcement members that weld and join the upper struts that are not connected to the base plate embedded in the ground, and the connection plates that are divided into two parts are installed, and the respective connection plates are inserted into the cutting site in the state where each connection plate is inserted. It is possible to maintain the same strength as the struts at the time of new construction by welding and joining the mating surfaces, the respective connecting plates and the upper struts, and the respective connecting plates and the ground. It is what.

The invention according to claim 4 is a repair method for a handrail strut for repairing an existing handrail strut that has been partially corroded. The corroded portion of the strut is cut and removed, and is removed at the cutting site. A threaded deformed reinforcing bar that joins the upper strut and the concrete anchor driven into the ground , and a connecting plate divided in two to be inserted below the upper strut, and a mating surface of each connecting plate, It is characterized in that it is possible to maintain the same strength as a support column at the time of new construction by welding the connection plate and the upper support column and between each connection plate and the ground. .

  The invention according to claim 5 is characterized in that the support column is formed in a rectangular tube shape and the connecting plate is formed in a U-shape.

  According to a sixth aspect of the present invention, a hole is formed in a portion of the column at a position of a neutral axis of a secondary moment of inertia applied to the column, and a liquid reinforcing material is injected from the hole. Yes.

  The invention according to claim 7 is characterized in that a round bar-like reinforcing bar is wound around the lower end of the connecting plate and welding is performed over the entire circumference.

  According to the present invention, the corroded portion is cut, and the reinforcing member and the connection plate formed in two are installed at the cut portion. When the base plate is embedded in the ground, the reinforcing bar as a reinforcing member joins the base plate and the upper support column of the main body column, and by joining each connection plate and the connection plate and the upper column by welding, Each of the attachment plates is joined to the upper support column and firmly joins the two divided connection plates. Thereby, the repaired support | pillar can maintain the intensity | strength at the time of new construction.

In addition, when the base plate is not embedded in the ground , the concrete anchors in which threaded deformed reinforcing bars as reinforcement members are driven into the ground are joined to the upper struts of the main body struts. By joining with the support | pillar by welding, each attachment board will join the upper support | pillar and it will join firmly the connection plate divided into two. Thereby, the repaired support | pillar can maintain the intensity | strength at the time of new construction.

  Further, by joining the reinforcing member and the connecting plate to the cut portion, it is not necessary to completely replace the handrail support column, and it can be repaired at a low cost in a short period of time.

  In addition, even if this handrail support | pillar is formed in square tube shape, it may be formed in cylindrical shape.

  Further, in the present invention, the above-described intermediary plate may be deleted, and a connecting plate divided into two parts may be inserted into the cutting site, and the periphery thereof may be joined by welding.

  Next, one form of the repair method of the handrail support | pillar of this invention is demonstrated based on drawing. In the following description, the handrail support will be described for a veranda of an apartment house such as an apartment. However, the handrail support is not limited to this, and can be applied to, for example, a handrail support for a bridge. is there.

  FIG. 1 shows a general handrail support column. As shown in FIG. 1, the handrail support column 1 includes a rectangular tube-shaped main body column 3 erected from a veranda parapet 2 formed as a ground, and a main body. A handrail 7 and a lower cross beam member 8 extending in the horizontal direction at the upper portion from the support column 3 via the support portion 5 are provided. In general, a plurality of vertical beam members 9 are arranged between the handrail 7 and the lower horizontal beam member 8 to prevent falling. A corroded portion 3 a that is corroded from the root portion to an upper portion with a certain interval is formed at the lower portion of the main body column 3. The corrosion portion 3a has a high degree of danger as the degree of corrosion progresses.

  2 to 3 are perspective views illustrating the first embodiment of the repair method in an easy-to-understand manner, and FIGS. 4 to 6 show the respective surfaces. In the repair method of the first embodiment, the corroded portion 3a of the main body column 3 is cut, a reinforcing member is disposed, and a connecting plate 15 is further attached to restore the original shape by welding.

  First, when a turn part 2a is formed by turning around the base part of the main body support 3 in the parapet 2, an embedded box (not shown) appears in the turn part 2a. Next, the main body column 3 is cut from the base portion of the main body column 3 at a position above the upper end of the corroded portion 3a. In this state, the main column 3 is left with a main column (hereinafter referred to as an upper column) 3b that is not removed at the upper portion and a main column (hereinafter referred to as an embedded column) 3c embedded at the lower portion. The upper column 3b is supported by the handrail 7 and the lower cross beam member 8.

  Since rust accumulated for many years has accumulated in the main body support column 3, it is removed with a vacuum cleaner while hitting the rust in the embedded support column 3c.

  When the base plate 11 is present in the parapet 2, the L-shaped two reinforcing bars 12 are inserted into the embedded support column 3 c so as to extend from the upper surface of the base plate 11 into the upper support column 3 b. To do. Both outer dimensions of the line connecting the two reinforcing bars 12 and 12 are formed smaller than the inner width dimension of the attachment plates 18 and 19 after fitting the below-described connecting plates 16 and 17 in the upper column 3b (FIG. 6). The connection plates 16 and 17 can be easily attached. The L-shaped reinforcing bar 12 is adjacent to the base plate 11 at the horizontal portion, and is joined to the base plate 11 by welding all around.

  On the other hand, as shown in FIGS. 7 to 8, the connecting plate 15 to be inserted into the cut corrosion portion 3 a of the main column 3 is formed in two parts, the first connecting plate 16 and the second connecting plate 17. Is also formed in a U-shape with the opening on the inside, and interposed plates 18 and 19 are joined to the respective connecting plates 16 and 17 by welding all around. The first attachment plate 18 fitted into the first connection plate 16 is formed in a U shape and protrudes upward and sideward (opening side) with respect to the first connection plate 16. It is joined to one connection plate 16 by all-around welding or spot welding. The second support plate 19 is joined to the second connection plate 17 by all-around welding or spot welding in a state where the side length is smaller than the second connection plate 17 and protrudes upward.

  Then, the pair of connecting plates 15 are attached to the cutting portion of the main body column 3. At this time, the two reinforcing bars 12 and 12 are covered with the respective attachment plates 18 and 19 so that the opening portions of the first connection plate 16 and the second connection plate 17 are aligned with each other. Assemble. In this state, the mating surfaces of the upper surfaces of the connecting plates 16 and 17 and the upper column 3b and the mating surfaces of the connecting plates 16 and 17 are welded all around, so that as shown in FIG. The upper support column 3b and the embedded support column 3c are connected by the connection plate 15 to newly form one main support column 3.

  A round bar-shaped reinforcing bar 20 having a diameter smaller than that of the reinforcing bar 12 is wound around the entire surface of the joining surface of the connecting plate 15 and the embedded support column 3c, and the entire periphery is welded.

  Next, the welded portion of the integrated main body column 3 is polished with a sander or the like so as not to become thin, and the surface is finished to be smooth.

  Further, at a position above the connecting plate 15 in the upper column 3b, as shown in FIG. 4, one hole 21 is formed around the center position of the longitudinal surface of the upper column 3b. It is desirable to form the hole 21 at a position serving as a neutral axis of the secondary moment applied to the upper support column 3b.

  After the holes 21 are drilled, cement-based non-shrink mortar, for example, pre-Eurox (manufactured by Taiheiyo Material Co., Ltd.) is injected from the holes 21 as a liquid reinforcing material and filled in the main body column 3. Thereby, the new main body support | pillar 3 can hold | maintain the intensity | strength substantially the same as the main body support | pillar at the time of new construction. The strength of the new main body column 3 is proved by the calculation result.

  After filling the reinforcing material, the hole 21 is filled with a metal putty to close the hole 21, and the entire main body column 3 is subjected to rust prevention coating and finish coating.

  Finally, mortar filling is performed on the turned portion 2a formed at the base portion of the main body support column 3 to restore the shape.

  As mentioned above, in the 1st form by the repair method of a handrail support | pillar, the corrosion part 3a of the main body support | pillar 3 is cut | disconnected from the position above the upper end of the corrosion part 3a, and the position below a lower end position, and it reinforces to a cutting part. Since the pair of reinforcing bars 12 and 12 and the connecting plate 15 are attached and joined by welding, it is not necessary to replace the entire main body column 3, and repair work can be performed at a low cost in a short period of time. Further, when the connecting plate 15 is mounted, the upper support column 3b and the connection plate are provided by interposing the attachment plates 18 and 19 joined to the upper support column 3b of the main body support column 3 in each of the connection plates 16 and 17 divided into two parts. 15, the rebars 12 and 12, and the parapet 2 via the base plate 11 can be firmly joined, so that the same strength as that of the main body column at the time of new construction can be maintained. Moreover, between the connecting plate 15 and the embedded support column 3c, a round bar-like reinforcing bar 20 is wound and joined by welding, and the body support column 3 is filled with a reinforcing material, so that the strength of the handrail support column is further improved. Can do.

  In addition, although the main body support | pillar 3 is formed in the square cylinder shape in the above-mentioned form, a cylindrical thing may be sufficient. In this case, since the connecting plate 15 is formed in the same shape as the main body column 3, a half-cylindrical member divided into two parts is manufactured. Accordingly, the intervention plate is also formed in a semi-cylindrical shape. In the case of the first embodiment, the interposition plate may be formed in a flat plate shape instead of a U shape.

  Furthermore, a pair of reinforcing bars may be arranged in parallel in the embedded support column 3c, or a pair of reinforcing bars may be arranged at opposite corners. In the perspective views of FIGS. 2 to 3, the reinforcing bars are shown in a straight shape, but may be straight or formed in an L shape.

  Next, a 2nd form is demonstrated based on FIGS.

  A 2nd form is a case where the handrail support | pillar 1 of the veranda in which the baseplate is not embed | buried in the parapet 2 is repaired. In this case, instead of the reinforcing bars 12 and 12 used in the first embodiment, the concrete anchor 25 is driven into the parapet 2 and the threaded deformed reinforcing bar 26 is tightened. In the following description, the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment. Moreover, since the repair method of the 2nd form changed the reinforcing bar 12 into the concrete anchor and the threaded deformed reinforcing bar, the other procedure shall follow a 1st form in principle.

  As in the first embodiment, after forming the turn portion 2a in the parapet 2, as shown in FIGS. 9 to 10, the corroded portion 3a of the main body column 3 is cut at a position above its upper end and at a position below its lower end. To remove. Since the upper column 3b and the embedded column 3c remain in the main column 3, two concrete anchors 25 and 25 are inserted from the embedded column 3c toward the bottom of the ground and driven from above. Threaded deformed reinforcing bars 26 and 26, in which the upper part is inserted into the upper column 3b and the screw is formed in the lower part, are tightened into the concrete anchors 25 and 25 that have been driven. The threaded deformed reinforcing bars 26 and 26 are joined by welding in the embedded support column 3c and the upper support column 3b.

  Thereafter, the same process as in the first embodiment is performed, and the first connection plate 16 and the second connection plate 17 in which the attachment plates 18 and 19 similar to those in the first embodiment are fitted are changed into the cutting portions of the main body column 3. Attach to. Then, the mating surfaces of the connecting plates 16 and 17 and the upper support column 3b and the connecting plates 16 and 17 are joined by welding. Then, a round bar-like reinforcing bar 20 is wound around the entire peripheral surface of the connection plate 15 around the connection portion between the lower end portion of the connection plate 15 and the embedded support column 3c, and the entire periphery is welded. Further, the reinforcing material is injected by drilling the hole 21 at a position above the joint of the upper column 3b with the connecting plate 15, that is, at the neutral axis of the secondary moment in the longitudinal direction of the upper column 3b.

  As described above, also in the second embodiment, it is inexpensive and can be performed in a short period of time, and the strength is maintained in the same manner as the main column in the new construction. Also in the case of the second embodiment, the intervention plate may be formed in a flat plate shape instead of a U shape.

  Next, the repair method of the handrail support | pillar by a 3rd form is demonstrated based on FIGS.

  A 3rd form is a case where the corrosion part 3a which generate | occur | produced in the main body support | pillar 3 is mild. In this case, since it is not necessary to cut and remove the corroded portion 3a, a round bar rebar is welded.

  First, as in the first and second embodiments, the base portion of the main body support 3 in the parapet 2 is rolled to form the turn portion 2a.

  Next, after removing the rust around the corroded portion 3a, the round bar-like reinforcing bar 20 used in the first form or the second form is wound around the root portion of the main body column 3 and the entire circumference is welded.

  Next, a hole 21 is formed at a position above the corroded portion 3 a at the center of the longitudinal surface of the main body column 3, that is, at the position of the neutral axis of the secondary moment of inertia applied to the main body column 3. Then, rust in the main body column 3 is removed while hitting the main body column 3, pre-eurox is injected, and the main body column 3 is filled.

  Thereafter, the hole 21 is filled with a metal putty to close the hole 21, and then the front surface of the main body column 3 is subjected to rust prevention coating, and then finish coating is performed.

  Further, the repaired mortar is filled in the turned portion 2a of the parapet 2 to restore the parapet to its original shape.

  As described above, when the degree of corrosion is mild, it is only possible to weld the reinforcing bars, so that the construction can be completed in a short period of time at a very low cost.

  Next, a 4th form is demonstrated based on FIGS.

  The repair method of the handrail support in this form is performed by removing the attachment plates 18 and 19 used in the first form and the second form. That is, as shown in FIGS. 15 to 17, when the base plate 11 is present in the parapet 2, the two L-shaped reinforcing bars 12, 12 are inserted into the embedded support column 3 c and the upper part from the upper surface of the base plate 11. Stands up in the column 3b. Both outer dimensions of the line connecting the two reinforcing bars 12 and 12 are formed smaller than the inner width dimension of the connecting plates 16 and 17 after the connecting plates 16 and 17 are fitted in the upper support column 3b (see FIG. 17). Accordingly, the connecting plates 16 and 17 can be easily attached. The L-shaped reinforcing bar 12 is adjacent to the base plate 11 at the horizontal portion, and is joined to the base plate 11 by welding all around.

  After the connection plates 16 and 17 are inserted into the connection sites, the connection plates 16 and 17 are welded at the respective mating surfaces, and the upper surfaces of the connection plates 16 and 17 are welded at the mating surfaces with the upper support column 3b over the entire circumference. A round bar-shaped reinforcing bar 20 is wound around the entire peripheral surface of the connecting plates 16 and 17 around the connection portion between the lower end portion and the embedded support column 3c, and the entire periphery is welded.

  Moreover, when repairing the handrail support | pillar 1 of the veranda in which the baseplate is not embed | buried in the parapet 2, it is as showing in FIG. Instead of the reinforcing bars 12, 12, the concrete anchor 25 is driven into the parapet 2 and the threaded deformed reinforcing bar 26 is tightened.

  Threaded deformed reinforcing bars 26 and 26, in which the upper part is inserted into the upper column 3b and the screw is formed in the lower part, are tightened into the concrete anchors 25 and 25 that have been driven. The threaded deformed reinforcing bars 26 and 26 are joined by welding in the embedded support column 3c and the upper support column 3b.

  And after connecting plate 16 and 17 is inserted in a connection part, while welding with each mating surface, the upper surface of coupling plate 16 and 17 is welded with the mating surface with upper support | pillar 3b over the perimeter, A round bar-like reinforcing bar 20 is wound around the entire peripheral surface of the connecting plates 16 and 17 around the connection portion between the lower end portion 17 and the embedded support column 3c to perform all-around welding.

  In any repair method according to the fourth embodiment, since the attachment plates 18 and 19 in the first and second embodiments are removed, the other procedures are basically the first or second. It shall follow the form of 2.

  Also in this embodiment, the corroded portion 3a of the main body column 3 is cut from a position above the upper end of the corroded portion 3a and a position below the lower end position, and a pair of reinforcing bars 12 and 12 or a pair of threads for reinforcing the cut portion. Since the deformed reinforcing bars 26 and 26 and the connecting plate 15 are attached and joined by welding, it is not necessary to replace the entire main body column 3, and repair work can be performed at a low cost in a short period of time.

  As shown in FIG. 16, the main column 3 (upper column 3 a) has a central portion of the longitudinal surface at a position above the connecting plates 16 and 17, as in the first and second embodiments. In other words, the hole 21 is formed at the position of the neutral axis of the secondary moment of inertia applied to the main body column 3 to inject the pre-eurox so that the main column 3 can be filled.

It is a front view which shows the handrail support | pillar installed in the veranda. It is a perspective view which shows the repair construction method by a 1st form. It is a perspective view which shows the state which joined the connection plate to the main body support | pillar in FIG. FIG. 4 is a side view in FIG. 3. It is the same front view. It is VI-VI sectional drawing in FIG. FIG. 3 is a plan sectional view showing a connecting plate in which a support plate in FIG. 2 is fitted. It is the same perspective view. It is a perspective view which shows the repair construction method by a 2nd form. It is a perspective view which shows the state which joined the connection plate to the main body support | pillar in FIG. It is a side view in FIG. It is the same front view. It is a side view of the main body support | pillar which shows the repair construction method by a 3rd form. FIG. It is a perspective view which shows the repair construction method by a 4th form. It is a side view in FIG. FIG. It is a perspective view which shows another form of a 4th form.

Explanation of symbols

1, handrail support 2, parapet (ground)
2a, turn part 3, main body support 3a, corrosion part 3b, upper support 3c, buried support 7, handrail 11, base plate 12, rebar 15, connection plate 16, first connection plate 17, second connection plate 18, 1st support plate 19, 2nd support plate 20, round bar-shaped rebar 21, hole 25, concrete anchor 26, threaded deformed rebar

Claims (7)

A repair method for handrail struts that repairs existing handrail struts that have been partially corroded,
The corroded portion of the support column is cut and removed, and a rebar member that welds and joins the upper support column that is not removed and the base plate embedded in the ground and a connection plate that is divided into two are installed at the cutting site. ,
Each of the connection plates divided into two is fitted with a welded joint plate, and each of the support plates is arranged so as to protrude from the respective connection plate to the upper support column. In a state of projecting to the connecting plate side and inserting each connecting plate into the cutting site, the mating surface of each connecting plate, between each connecting plate and the upper column, and each connecting plate and the above A repair method for handrail struts, which can maintain the same strength as the struts at the time of new construction by welding the ground to the ground. A repair method for handrail struts that repairs existing handrail struts that have been partially corroded,
The corroded portion of the support column is cut and removed, and a threaded deformed reinforcing bar that joins the unsupported upper support column and the concrete anchor driven into the ground to the cut site, and is inserted below the upper support column 2 Install the divided connecting plate,
Each of the connection plates divided into two is fitted with a welded joint plate, and each of the support plates is arranged so as to protrude from the respective connection plate to the upper support column. In a state of projecting to the connecting plate side and inserting each connecting plate into the cutting site, the mating surface of each connecting plate, between each connecting plate and the upper column, and each connecting plate and the above A repair method for handrail struts, which can maintain the same strength as the struts at the time of new construction by welding the ground to the ground. A repair method for handrail struts that repairs existing handrail struts that have been partially corroded,
The corroded portion of the support column is cut and removed, and a rebar member that welds and joins the upper support column that is not removed and the base plate embedded in the ground and a connection plate that is divided into two are installed at the cutting site. ,
With the connection plates inserted into the cutting site, the joining surfaces of the connection plates, the connection plates and the upper column, and the connection plates and the ground are welded. By this, the repair method for handrail props, which can maintain the same strength as the new props. A repair method for handrail struts that repairs existing handrail struts that have been partially corroded,
The corroded portion of the support column is cut and removed, and a threaded deformed reinforcing bar that joins the unsupported upper support column and the concrete anchor driven into the ground to the cut site, and is inserted below the upper support column 2 Install the divided connecting plate,
It is possible to maintain the same strength as the struts at the time of new construction by welding the mating surfaces of each connection plate, between each connection plate and the upper column, and between each connection plate and the ground. A repair method for handrail props characterized by   The method for repairing a handrail strut according to any one of claims 1, 2, 3 and 4, wherein the strut is formed in a rectangular tube shape and the connecting plate is formed in a U-shape.   A hole is formed in a position of a neutral axis of a moment of inertia of a section applied to the column in a part of the column, and a liquid reinforcing material is injected from the hole. , 4 or 5 repair method for handrail post.   A repair method for a handrail strut according to any one of claims 1, 2, 3, 4, 5 or 6, wherein a round bar-like reinforcing bar is wound around the lower end of the connecting plate and welding is performed over the entire circumference. .

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