JP4882039B2 - 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 on the existing bridge, it relates to a construction method in which a new protective fence is replaced on the ground-covered concrete with the root remaining in the existing protective fence for the bridge.

As shown in FIG. 11 , the bridge guard fence is constructed along the roadway as shown in FIG. 12 , in which a guard fence post 103 provided with a slip-off prevention plate 102 is embedded in the ground concrete 101 on the shoulder of the roadway . There is a base 105 fixed to the ground-covered concrete 101 with anchor bolts 104, and a structure in which a guard fence post 103 is fastened and fixed on the base 105 (see Patent Document 1).

JP 2001-234515 A

However, it is necessary to replace the protective fence for bridges due to aging due to exposure to wind and rain or damage due to accidents. As shown in FIG. 11 , there are many protective fences corresponding to this replacement time, in which a support post is embedded in the underground concrete. The replacement work is performed by removing the underground concrete with an excavator or the like. The present situation is that the protective fence is removed and then the concrete is newly constructed and the protective fence is attached.

This protective fence replacement work involves demolishing the ground cover concrete, newly assembling the ground concrete formwork, and placing anchor bolts as shown in FIG. 12 and struts in the formwork as shown in FIG. The problem is that the concrete has to be placed, the concrete is solidified, the work frame is removed and the protective fence is attached, and long-term traffic restrictions such as one-way traffic are required during the construction period. Will occur.

  In addition, demolishing underground concrete for replacement of protective fences and constructing new underground concrete incurs construction costs and problems such as the replacement of an old protective fence does not proceed as expected. is there.

  The present invention was devised in view of the above points, and provides an existing method for replacing a guard fence for a bridge that can be used to replace the guard fence without demolishing existing ground-covered concrete. It is intended.

  In order to achieve the above object, the method for replacing an existing bridge guard fence according to the present invention is the existing bridge guard installed with the bottom end of the bridge guard fence embedded in the concrete. In the replacement method of the fence, a step of removing the existing bridge protection fence by cutting the boundary line of the pillar exposed from the ground concrete with the ground concrete, and a remaining hole by the pillar left in the ground concrete A step of burying with a filler, a step of drilling anchor bolt installation holes around the remaining holes, a step of inserting and fixing anchor bolts in the anchor bolt installation holes with a hardener, and projecting on the ground concrete A step of attaching a guard fence for a bridge by fastening and fixing a new support column having an anchor bolt insertion elongated hole that can be inserted into the anchor bolt.

  Here, by disassembling the existing protective fence, cutting the struts to prevent rusting and primer treatment, and then injecting a filler such as mortar into the base of the struts left in the ground concrete, the existing ground It is possible to replace the newly constructed protective fence for bridges without destroying the covering concrete.

  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 installed in a state in which the lower end of the bridge guard fence post is buried in the underground concrete. In the replacement method of the protective fence for the building, the step of removing the existing protective fence for the bridge by cutting the boundary line of the supporting column exposed from the covering concrete with the covering concrete, and the leaving by the supporting pillar to be left in the covering concrete A process of embedding holes with a filler, a process of drilling anchor bolt installation holes on both sides of the remaining holes, a process of inserting and fixing anchor bolts in the anchor bolt installation holes with a hardener, and insertion into the anchor bolts are possible. A new strut having a long hole for inserting an anchor bolt is inserted into an anchor bolt projecting on the ground concrete, and the ground And fastened to the strut junction plates is fixed in a state of projecting to the bridge outside the concrete comprising the step of attaching the bridge for safety barrier.

  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 order to achieve the above object, the method for replacing an existing bridge guard fence according to the present invention is an existing bridge installed in a state in which the lower end of the bridge guard fence post is buried in the underground concrete. In the replacement method of the protective fence for the building, the step of removing the existing protective fence for the bridge by cutting the boundary line of the supporting column exposed from the covering concrete with the covering concrete, and the leaving by the supporting pillar to be left in the covering concrete A step of burying a hole with a filler, a step of drilling an anchor bolt installation hole with respect to a bridge outer wall surface of the ground concrete, a step of inserting and fixing an anchor bolt into the anchor bolt installation hole with a hardening material, Insert the anchor bolts into the anchor bolt insertion long holes that are installed in the column connection plates that are installed outside the concrete concrete bridge. Constant, and comprising the step of attaching a safety barrier of the newly established columnar junction plate.

  Here, when a protective fence cannot be installed on the top surface of the ground-covered concrete, it is possible to replace the newly installed protective fence for a bridge 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, a significant cost reduction is possible.

  In addition, by concealing the struts of the existing guard fences for bridges with the new guard fences, in the case of narrow terrain concrete, the strut joint plate should be extended to the outside of the road from the terrain concrete. By installing it, it is possible to replace the newly constructed guard fence for bridges.

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 column 3 is embedded in the ground-covered concrete 2 in a state where a flat plate-like prevention plate 4 is integrally attached to the base.

  Therefore, as shown in FIGS. 2A, 2B and 2C, the various rails 5 provided between the support columns 3 are removed so that only the support columns 3 are provided. Next, a gas burner melts the boundary line between the support 3 exposed from the ground concrete 2 and the ground concrete 2. In this case, an operation such as further cutting down is performed so that the upper end of the column 3 left after being melted by the gas burner is not exposed from the cover concrete 2.

  Therefore, the remaining holes 6 by the support pillars are opened at regular intervals on the existing protective fence on the ground concrete 2. Therefore, in order to attach a new protective fence on the remaining hole 6, four anchor bolt installation holes 7 are drilled around the remaining hole 6 with a concrete drill as shown in FIG.

  Here, as shown in FIG. 3, the anchor bolt installation hole 7 is located at a position where the anchor bolt installation hole 7 does not come into contact with the escape prevention plate 4 embedded in the ground concrete 2, that is, around the escape prevention plate 4. It is set as the structure which provides.

  Then, as shown in FIGS. 4 (a), (b), and (c), after the inside of the anchor bolt installation hole 7, the resin-cured resin contained in the capsule that is cured by stirring in the anchor bolt installation hole 7 is used. The agent 9 is inserted, the anchor bolt 10 is mounted on the electric hammer drill 11 and the like, rotated and blown, and the curing agent 9 is agitated and mixed until it reaches the bottom surface of the anchor bolt installation hole 7.

  Further, as shown in FIG. 5, primer application and rust prevention are performed in the remaining hole 6, and the remaining hole 6 is buried with a mortar 12 so as to be flush with the upper surface of the ground concrete 2. In this way, a pre-process for attaching a new protective fence is performed.

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

  Further, the plate plate 13 is provided with four anchor bolt insertion slots 14 corresponding to the arrangement state of the anchor bolts 10. Therefore, the anchor bolt insertion long hole 14 of the plate plate 13 of the column 3A is inserted into the anchor bolt 10 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, the newly installed support column 3A is erected on the remaining hole 6, and the upper rail 5A, the lower rail 5B, and the like are installed between the support columns 3A to replace the protective fence 1A. 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 base portion of the support column 3 of the existing protective fence 1 is melted and removed, and embedded in the remaining hole 6 with a mortar 12 as shown in FIG. And the same surface as the upper surface of the ground-covering concrete 2.

  Therefore, as shown in FIG. 8C, two anchor bolts 10 are attached to the anchor bolt installation holes 7 provided on both sides of the remaining hole 6 of the ground covering concrete 2 as shown in FIGS. Arranged according to the construction procedure shown in c).

  Next, as shown in FIG. 8 (a), a column joining plate 15 is installed with the anchor bolt 10 protruding to the rear of the ground concrete 2 and the bottom surface of this column joining plate 15 is shown. 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 10 can be inserted is penetrated in the front side of the column joining plate 15, and fastening for joining the column to the rear side of the column joining plate 15 is performed. 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 10 at 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 and buried in the remaining hole 6 with the mortar 12 as shown in FIG. The same surface as the upper surface.

  Then, as shown in FIG. 9 (a), anchor bolts are installed on the wall surface on the outer wall surface of the concrete cover 2 bridge as described in detail in FIGS. 4 (a), (b) and (c). A hole 7 is drilled and four anchor bolts 10 are embedded.

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

  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.

  Further, in this embodiment, the mortar is filled in the remaining hole, but it is not always necessary to fill the mortar, and any material can be used as long as it is a filler excellent in workability and strong resistance such as a synthetic resin material. It doesn't matter.

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.

  First, as shown in FIGS. 10 (a) and 10 (b), the column joining plate 15 is installed in a state where the anchor bolt 10 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 10 can be inserted is provided through the front side of the column joining plate 15.

  Therefore, as shown in FIG. 10A, the anchor bolt insertion elongated hole 14 </ b> A 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 10. 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 addition, although the protective fence 1A in the said Example 4 explained in full detail about the combination with the support | pillar part 3A made from an aluminum alloy in the support | pillar auxiliary | assistance part 21 made from steel, it is not necessarily required to be a combination with the support | pillar 3A made from aluminum alloy. For example, it may be a combination with a steel support 3A or another metal support 3A.

  In the construction method of the existing bridge guard fence of the present invention having the above configuration, the existing guard fence is disassembled, the pillar is cut and rust-prevented, and after the primer treatment, the pillars left in the ground concrete are removed. By injecting mortar into the root, it can be used without demolishing the existing underground concrete.

  In addition, by embedding anchor bolts so as to avoid the reinforcing bars in the ground-covered concrete around the pillars left in the ground-covered concrete, replacement work of the protective fence that is no different from the normal guard fence on the ground-covered concrete is possible. It becomes possible.

  In addition, as described in detail in Example 2, when the existing underground concrete width is narrow, the protective fence can be replaced by attaching a column joining plate that projects to the outside of the bridge on the underground 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.

  Further, as described in detail in Example 4, even when the protective fence is made of a light metal such as an aluminum alloy, a plate plate made of steel is stacked on the column joining plate installed on the ground concrete 2. The protective fence made of aluminum alloy or the like can be replaced by attaching the pillar of the aluminum alloy protective fence to the support auxiliary part projecting on the plate plate and connecting it with the connecting bolt. It can be easily performed.

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 cut | disconnects the pillar of the existing protection fence in the replacement construction method of the existing protection fence for bridges to which this invention is applied, and drills an anchor bolt installation hole. FIG. 3 is an explanatory plan view showing a drilling position of an anchor bolt installation hole in FIG. 2. 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 inject | poured the mortar into the remaining hole after cut | disconnecting the support | pillar of the existing protection fence 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. 6, 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 to which this invention is applied. 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 existing protection fence. It is explanatory drawing which shows an example of the conventional guard fence for bridges.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Guard fence 2 Overlay concrete 3, 3A support | pillar 4 Fall-out prevention board 5 Rail 6 Retained hole 7 Anchor bolt installation hole 9 Hardener 10 Anchor bolt 11 Electric hammer drill 12 Mortar 13 Plate board 14, 14A Anchor bolt insertion length Hole 15, 15A Supporting plate 16 Support plate 17 Reinforcement rib 18 Fastening hole 19 Fastening member 20 Wall surface joining plate 21 Supporting column 22 Connecting bolt

Claims (5)

In the method of replacing the existing bridge protection fence, which is installed with the bottom end of the bridge protection fence post buried in the ground concrete,
Cutting off the existing bridge protection fence by cutting the boundary line with the ground concrete of the pillar exposed from the ground concrete;
A step of burying a remaining hole by a pillar to be left in the ground concrete with a filler;
Drilling anchor bolt installation holes around the remaining holes;
Inserting and fixing an anchor bolt with a hardener in the anchor bolt installation hole;
An existing bridge protection comprising a step of fastening and fixing a new support column having an anchor bolt insertion elongated hole that can be inserted into an anchor bolt projecting on the ground covering concrete, and attaching a bridge protection fence. Fence replacement method. In the method of replacing the existing bridge protection fence, which is installed with the bottom end of the bridge protection fence post buried in the ground concrete,
Cutting off the existing bridge protection fence by cutting the boundary line with the ground concrete of the pillar exposed from the ground concrete;
A step of burying a remaining hole by a pillar to be left in the ground concrete with a filler;
Drilling anchor bolt installation holes on both sides of the remaining hole;
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 method of replacing the existing bridge protection fence, which is installed with the bottom end of the bridge protection fence post buried in the ground concrete,
Cutting off the existing bridge protection fence by cutting the boundary line with the ground concrete of the pillar exposed from the ground concrete;
A step of burying a remaining hole by a pillar to be left in the ground concrete with a filler;
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 long hole provided in a column joining plate provided outside the bridge of the ground-concrete concrete, and a new guard fence is attached on the column joining plate. Replacement method for existing guard fences for bridges. The said filler is mortar. The replacement method of the existing guard fence for bridges of Claim 1, Claim 2 or Claim 3 characterized by the above-mentioned. The elongated hole for inserting the anchor bolt has a length that allows the position of the anchor bolt to be shifted when the anchor bolt is in contact with a reinforcing bar in the ground-covered concrete in the length direction of the bridge. 5. A method for replacing an existing bridge guard fence according to claim 1, claim 2, claim 3 or claim 4.

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