JP5190599B2 - Replacing existing guard fences for bridges - Google Patents

Description

  The present invention relates to a method for replacing an existing bridge protective fence. Specifically, when replacing the protective fence in the existing bridge, it relates to a construction method in which a new protective fence is replaced on the underground concrete with the anchor bolt left in the underground concrete.

  For example, as shown in FIG. 11, the bridge guard fence has a structure in which a base plate 104 of the guard fence 103 is fastened and fixed by a nut member 105 to an anchor bolt 102 embedded in the ground concrete 101 on the road shoulder. (See Patent Document 1).

JP 2001-234515 A

  However, bridge protection fences are deteriorated due to aging or accidents caused by exposure to wind and rain, and anchor bolts are less durable due to new protection fence types or rust, and both must be replaced. Therefore, to replace the guard fence, after releasing the fastening with the anchor bolt and removing the guard fence, the ground concrete around the anchor bolt is demolished with a rock drill etc., the anchor bolt is taken out, and the anchor bolt is newly buried. Although the construction method is adopted, it becomes very complicated work, and there arises a problem that long-term traffic regulation such as one-sided traffic must be performed during the construction period.

  In addition, as shown in FIGS. 12 (a) and 12 (b), after the exposed portion of the anchor bolt 102 is cut and repaired with mortar or the like, the remaining anchor bolt 102 hinders the installation of a new protective fence 103A. There is a construction method in which a new anchor bolt 102A is embedded in a position where it does not come out and a new protective fence 103A is installed, but the repaired portion of the remaining anchor bolt 102 is conspicuous and the aesthetic appearance is impaired, and the position of the anchor bolt is shifted. There is a problem that the construction becomes complicated.

  The present invention was devised in view of the above points, and is an existing bridge that can be used to replace a protective fence without demolishing existing ground covering concrete or without shifting the anchor bolt burying position. The purpose is to provide a replacement method for protective fences.

  In order to achieve the above object, the method for replacing an existing bridge guard fence according to the present invention is an existing bridge in which the lower end of the bridge guard fence is fastened and fixed to an anchor bolt embedded in the underground concrete. In the protective fence replacement method, the step of removing the pillars of the existing bridge protective fence from the anchor bolts embedded in the above ground concrete and cutting the boundary line between the anchor bolt exposed from the ground concrete and the ground concrete Then, a step of covering the upper end surface of the anchor bolt left in the ground covering concrete with mortar, a step of drilling an anchor bolt installation hole around the remaining anchor bolt, and projecting on the ground covering concrete A process of attaching a guard fence for a bridge by fastening and fixing a new column with an anchor bolt insertion slot that can be inserted into the anchor bolt Provided.

  Here, the existing guard fence is removed from the anchor bolts, the remaining anchor bolts are cut, and new anchor bolts are installed around the remaining anchor bolts without demolishing the existing underground concrete, New protection fences for bridges can be replaced.

  In addition, in order to achieve the above object, the method for replacing an existing bridge guard fence according to the present invention includes an anchor bolt embedded in the underground concrete and the lower end of the bridge guard fence post fastened and fixed. In the replacement method of the protective fence for bridges, the process of cutting the boundary line between the anchor bolt exposed from the ground concrete and the ground concrete and covering the upper end surface of the anchor bolt left in the ground concrete with mortar A step of drilling anchor bolt installation holes on both sides of the remaining anchor bolt, a step of inserting and fixing the anchor bolt with a hardener in the anchor bolt installation hole, and an anchor bolt insertion length that can be inserted into the anchor bolt A new support column having a hole is inserted into an anchor bolt projecting on the cover concrete, and the front Was fastened to the strut junction plates is fixed in a state of projecting to the bridges outer Jibuku concrete comprising the step of attaching the bridge for protective fence.

  Here, when the existing cover concrete width is narrow, the work of replacing the newly installed guard fence for the bridge can be performed by attaching a column joining plate that projects to the outside of the bridge on the cover concrete.

  In addition, in order to achieve the above object, the method for replacing an existing bridge guard fence according to the present invention includes an anchor bolt embedded in the underground concrete and the lower end of the bridge guard fence post fastened and fixed. In the replacement method of the protective fence for bridges, the process of cutting the boundary line between the anchor bolt exposed from the ground concrete and the ground concrete and covering the upper end surface of the anchor bolt left in the ground concrete with mortar A step of drilling an anchor bolt installation hole in the outer wall surface of the bridge of the ground concrete, a step of inserting and fixing the anchor bolt into the anchor bolt installation hole with a hardening material, and a step of inserting the anchor concrete into the anchor bolt. Insert and fasten the anchor bolt insertion oblong hole established in the column connection plate provided outside the bridge. Comprising the step of attaching a safety barrier of the newly established case plate.

  Here, when a protective fence cannot be installed on the top surface of the ground-covered concrete, a new bridge-shaped protective fence can be replaced by attaching a column connection plate to the wall surface outside the bridge of the ground-covered concrete.

  The replacement method of the existing protective fence for the bridge according to the present invention has a shortened construction period and enables the replacement of the protective fence for the bridge without destroying the existing underground concrete. Therefore, significant cost reduction is possible.

  In addition, by hiding the remaining anchor bolts with a new protective fence, in the case of narrow underground concrete, a new bridge protective fence is installed by attaching the column connection plate so as to protrude from the underground concrete. Can be replaced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.
Example 1
FIG. 1 is an explanatory view showing an installed state of an existing protective fence in a method for replacing an existing bridge protective fence to which the present invention is applied.

The existing protective fence 1 is attached by fastening members such as bolts and nuts between columns 3 erected on the ground concrete 2 provided on the shoulder of the road.
Here, the base plate 4 is fixed to the lower end of the column 3. On the other hand, an anchor bolt 10 having an exposed screw portion is embedded in the ground covering concrete 2. The anchor bolt 10 is inserted into a through hole (not shown) in which the base plate 4 is opened, and is connected and fixed by a fastening member 19 such as a nut.

  Therefore, as shown in FIGS. 2 (a), (b), and (c), the connection between the anchor bolt 10 and the base plate 4 at the lower end of the column 3 is released, and the protective fence 1 is removed from the cover concrete 2. is there.

  Therefore, the upper end portion of the anchor bolt 10 protrudes from the ground concrete 2. The boundary between the anchor bolt exposed from the ground concrete 2 and the ground concrete 2 is melted by a gas burner. In this case, after fusing with a gas burner, the work is performed such as cutting down so that the upper end of the anchor bolt 10 left after rust prevention and primer treatment is below the upper surface of the ground concrete 2. A recess 23 is provided on the anchor bolt 10.

  Next, the mortar 12 is filled in the recess 23 formed on the upper end surface of each anchor bolt 10 so that the upper end surface of the fused anchor bolt 10 is not exposed, and the upper end surface of the anchor bolt 10 is exposed. Do not cover.

  Then, as shown in FIGS. 3 (a) and 3 (b), in order to attach a new protective fence on the anchor bolt 10 left in the ground covering concrete 2, four pieces are newly provided around the anchor bolt 10. The anchor bolt installation hole 7 is drilled with a concrete drill.

  Here, as shown in FIGS. 4 (a), (b), and (c), after the inside of the anchor bolt installation hole 7 is cleaned, the resin contained in the capsule that is hardened by stirring in the anchor bolt installation hole 7 Insert the hardener 9 and attach a new anchor bolt 10A to the electric hammer drill 11 or the like, rotate and blow it, and embed the hardener 9 until it reaches the bottom surface of the anchor bolt installation hole 7 while stirring and mixing. is there.

  Next, as shown in FIGS. 5 and 6, the new support 3 </ b> A is made of ductile cast iron having an H-shaped section, or made of steel, aluminum, stainless steel, and the like, and plate plates 13 are extended on both sides of the lower end thereof. The This plate 13 is formed longer than usual.

  Further, the plate plate 13 is provided with four anchor bolt insertion long holes 14 corresponding to the arrangement state of the new anchor bolt 10A. Therefore, the anchor bolt insertion slot 14 of the plate plate 13 of the column 3A is inserted into a new anchor bolt 10A embedded and installed in the ground concrete 2. This insertion long hole 14 is provided in the longitudinal direction of the concrete 2 so that the position can be shifted to the left and right again in order not to cut or damage the reinforcing bar when the concrete drill drill hits the reinforcing bar in the concrete. It is desirable that the shape of the elongated hole is formed along the length of the anchor bolt and the dimension of the elongated hole is at least three times the diameter of the anchor bolt.

  In this way, as shown in FIG. 7, a new support column 3A is erected on the remaining anchor bolt 10, and the upper rail 5A, the lower rail 5B, and the like are provided between the support columns 3A so as to reach the protective fence 1A. Replacement of is completed.

Example 2
Next, examples of installation in the case where the ground concrete width is narrow are shown in FIGS. 8 (a), (b) and (c), respectively.
As shown in FIGS. 2 (a), (b) and (c), the existing anchor bolt 10 protruding on the ground concrete 2 is melted, and the mortar 12 is filled in the recess 23 to cover the ground concrete 2 It covers so that it may become the same surface as the upper surface.

  Therefore, as shown in FIG. 8 (c), the two anchor bolts 10A are installed in the anchor bolt installation holes 7 provided on both sides of the anchor bolts 10 on which the underground concrete 2 is left, as shown in FIG. Place according to the enforcement procedure shown in (c).

  Next, as shown in FIG. 8 (a), a column joining plate 15 is installed in a state of protruding to the rear of the ground concrete 2 with respect to the anchor bolt 10A. The support plate 16 that abuts against the wall surface of the ground-covering concrete 2 protrudes at a right angle, and a reinforcing rib 17 is provided across the rear end of the support plate 16 and the column joining plate 15. is there. An anchor bolt insertion elongated hole 14A through which the anchor bolt 10A can be inserted is penetrated in the front side of the column joining plate 15, and fastening for joining to the column is performed on the rear side of the column joining plate 15 An oblong hole 18 is provided.

  Here, the column joining plate 15 is installed on the ground concrete 2 in a state where the anchor bolt insertion elongated hole 14A penetrating the anchor bolt 10A on the front side of the column joining plate 15 is inserted. As a result, the column joining plate 15 is installed in a state of projecting behind the ground covering concrete 2, and the plate plate 13 of the column 3 A is stacked on the column joining plate 15 and tightened with bolts and nuts. By joining with the member 19, the protection fence 1A can be replaced.

Example 3
Next, FIG. 9 (A) and FIG. 9 (B) show examples of installation in the case where the ground concrete width is narrow and the protective fence cannot be installed on the top surface of the ground concrete.
In this case, the existing protective fence installed on the ground-covering concrete is removed by the procedure described above in FIG. 2, the existing anchor bolt 10 protruding on the ground-covering concrete 2 is melted, and the recessed portion 23 is inserted. The mortar 12 is filled and laid so as to be flush with the upper surface of the ground concrete 2.

Then, as shown in FIG. 9 (a), as described in detail in FIGS. 4 (a), (b), and (c), an anchor bolt installation hole 7 is drilled on the outer wall surface of the bridge of the underground concrete 2. Four anchor bolts 10A are embedded.
When the anchor bolt installation hole 7 is drilled, the anchor bolt 10A is drilled around the anchor bolt 10 so as not to contact the anchor bolt 10 left in the ground concrete 2, and a new anchor bolt 10A is installed. It shall be attached.

  Here, the column joining plate 15A fastened and fixed to the anchor bolt 10A is attached to the outer wall surface of the bridge of the underground concrete 2, and this column joining plate 15A is bent and formed at 90 degrees. Reinforcing ribs 17 are provided between the plate 20, anchor wall insertion holes 14 </ b> A are penetrated through the wall surface bonding plate 20, and the column bonding plate 15 </ b> A is used for fastening for bonding with the column. A long hole 18 is provided.

  Therefore, by attaching the column joining plate 15A by the anchor bolt 10A attached to the outer wall surface of the bridge of the ground concrete 2 and the fastening members 19 such as bolts and nuts, the column joining plate 15A is moved to the outside of the ground concrete 2. It will be overhanging.

  The protective fence 1A can be replaced by stacking the plate plates 13 of the columns 3A on the column bonding plates 15A and bonding them with the fastening members 19 such as bolts and nuts.

Example 4
Next, examples of installation when the protective fence is made of a light metal such as an aluminum alloy are shown in FIGS.

  Here, when the protective fence 1A is made of a light metal such as an aluminum alloy, the plate plate 13 and the column auxiliary portion 21 protruding from the plate plate 13 have a problem in the welding strength of the aluminum alloy. Often done. A support 3 </ b> A of a protective fence 1 </ b> A made of aluminum alloy is fitted into the support auxiliary part 21 and is firmly connected by a coupling bolt 22.

  The existing protective fence installed on the ground concrete is removed by the procedure described above with reference to FIG. 2, the existing anchor bolt 10 protruding on the ground concrete 2 is melted, and the mortar 12 is filled in the recess 23. And laying so that it is flush with the upper surface of the ground concrete 2.

  Then, as shown in FIG. 10 (B), the anchor bolt installation hole 7 as described in detail in FIGS. And two new anchor bolts 10A are embedded.

  First, as shown in FIGS. 10 (a) and 10 (b), the column joining plate 15 is installed in a state where the anchor bolt 10A embedded in the ground concrete 2 is projected rearward from the ground concrete 2. A support plate 16 that abuts against the wall surface of the cover concrete 2 is provided on the bottom surface of the column joining plate 15 so as to project at a right angle, and further across the rear end of the support plate 16 and the column joining plate 15. The reinforcing rib 17 is provided. An anchor bolt insertion long hole 14A through which the anchor bolt 10A can be inserted is provided through the front side of the column joining plate 15.

  Therefore, as shown in FIG. 10 (a), the anchor bolt insertion long hole 14A penetrating the front side of the column joining plate 15 is installed on the ground concrete 2 in a state of being inserted into the anchor bolt 10A. Thereby, the said support | pillar joining plate 15 will be installed in the state projected over the ground-covering concrete 2 back.

  The plate plate 13 of the column 3A is stacked on the column bonding plate 15 and bonded by a fastening member 19 such as a bolt and a nut. Then, the support fence 3A of the aluminum alloy guard fence 1A is fitted into the support pillar auxiliary portion 21 projecting from the plate plate 13 and is connected by the coupling bolt 22 so that the guard fence 1A can be replaced. .

  In this embodiment, four or two anchor bolts are attached. However, it is not always necessary to use four or two, and the position of the reinforcing bar in the existing ground-covered concrete or the concrete is not necessarily required. It is desirable to determine the number according to the strength situation.

  In the method of replacing the existing bridge protection fence of the present invention having the above configuration, the existing protection fence is removed, the existing anchor bolts are cut to prevent rusting, the primer treatment is performed, and then the mortar 12 is filled. It is possible to replace the protective fence that is the same as a normal protective fence on the remaining anchor bolt by laying it so that it is flush with the upper surface of the concrete 2 and embedding a new anchor bolt around it. Become.

  In addition, as described in detail in Example 2, when the existing cover concrete width is narrow, the protective fence replacement work can be performed by attaching a support joint plate that projects to the outside of the bridge on the cover concrete. It becomes possible.

  Further, as described in detail in Example 3, when the width of the cover concrete is narrow and a protective fence cannot be installed on the top surface of the cover concrete, the reinforcing bars in the cover concrete are attached to the wall surface outside the bridge of the cover concrete. It is possible to replace the protective fence by embedding the anchor bolt so as to avoid it and attaching the column joining plate so as to project to the back side of the ground concrete by fastening and fixing with the anchor bolt.

It is explanatory drawing which shows the attachment state of the existing protection fence in the replacement construction method of the existing protection fence for bridges to which this invention is applied. It is explanatory drawing until it removes the existing protection fence in the replacement construction method of the existing bridge protection fence to which this invention is applied, and cut | disconnects an anchor bolt. It is explanatory drawing which shows the drilling position of the anchor bolt installation hole in FIG. It is explanatory drawing which shows the process of embedding an anchor bolt in the anchor bolt installation hole in the replacement construction method of the existing guard fence for bridges to which this invention is applied. It is explanatory drawing which shows the state which installed the new anchor bolt in the anchor bolt installation hole in FIG. It is explanatory drawing which shows the state which attaches the support | pillar of a new guard fence to the existing upper surface concrete. It is explanatory drawing which shows the state which attached each rail etc. to the support | pillar of the new protection fence in FIG. 5, and completed replacement | exchange. It is explanatory drawing which shows the example of installation in the case where the width of a concrete cover is narrow in the replacement method of the existing guard fence for bridges which applied this invention. It is explanatory drawing which shows the example of installation in the case of the replacement method of the existing protection fence for bridges to which this invention is applied, when a concrete cover width is narrow and a protection fence cannot be installed on this ground concrete surface. It is explanatory drawing which shows the example of installation in case the protection fence is light metal, such as an aluminum alloy, in the replacement construction method of the existing protection fence for bridges to which this invention is applied. It is explanatory drawing which shows the example of installation of the conventional protective fence. It is explanatory drawing which shows an example of the construction method of replacement | exchange of the existing guard fence for bridges.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Guard fence 2 Overlay concrete 3, 3A support | pillar 4 Base board 5 Rail 6 Remaining hole 7 Anchor bolt installation hole 9 Hardener 10 Existing anchor bolt 10A New anchor bolt 11 Electric hammer drill 12 Mortar 13 Plate board 14 Post Anchor bolt insertion oblong hole 14A Anchor bolt insertion oblong hole 15, 15A Prop joint plate 16 Support plate 17 Reinforcement rib 18 Fastening hole 19 Fastening member 20 Wall joint plate 21 Prop auxiliary part 22 Coupling bolt 23 depression

Claims (3)

In the replacement method of the existing bridge protection fence, where the lower end of the bridge protection fence post is fastened and fixed to the anchor bolts embedded in the underground concrete,
Cutting the boundary line between the anchor bolt exposed from the ground concrete and the ground concrete and covering the upper end surface of the anchor bolt left in the ground concrete with mortar;
Drilling anchor bolt installation holes on both sides of the left anchor bolt;
Inserting and fixing an anchor bolt with a hardener in the anchor bolt installation hole;
A new support column having an anchor bolt insertion elongated hole that can be inserted into the anchor bolt is inserted into an anchor bolt projecting on the ground concrete and fixed in a state of projecting to the outside of the bridge of the ground concrete. A method for replacing an existing bridge protection fence, comprising the step of attaching and securing a bridge protection fence on a pillar connection plate to be fixed. In the replacement method of the existing bridge protection fence, where the lower end of the bridge protection fence post is fastened and fixed to the anchor bolts embedded in the underground concrete,
Cutting the boundary line between the anchor bolt exposed from the ground concrete and the ground concrete and covering the upper end surface of the anchor bolt left in the ground concrete with mortar;
Drilling an anchor bolt installation hole on the bridge outer wall surface of the ground concrete; and
Inserting and fixing an anchor bolt with a hardener in the anchor bolt installation hole;
The anchor bolt is inserted and fastened through an anchor bolt insertion oblong hole established in a column joint plate provided outside the bridge of the ground concrete, and a new guard fence is attached on the column joint plate. Replacement method for existing guard fences for bridges. The elongated hole for inserting the anchor bolt shifts the position of the anchor bolt when the long diameter of the elongated hole for inserting the anchor bolt is the length direction of the bridge and the anchor bolt abuts on the reinforcing bar in the ground concrete. 3. A method for replacing an existing bridge protection fence according to claim 1 or 2 , wherein the length is such that the length can be adjusted.

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