JP5877926B1 - Leakage prevention structure for bridge and method for forming the same - Google Patents

Abstract

The present invention provides a water leakage prevention structure that effectively prevents water leakage occurring at a location where a through hole such as a manhole of a steel bridge is closed with a lid member. A water leakage prevention structure is configured by fixing a bottom member 1 to the periphery of a through hole α of a steel plate 100 and mounting and fixing a lid member 2 to the bottom member 1. An annular base 11 for fixing the bottom member 1 to the periphery of the through hole α in a liquid-tight manner over the entire circumference, a first annular wall 12 erected from the base 11, and a first annular of the base 11 The lid member 2 is configured so as to cover the bottom member 1, and the bottom member 1 of the top plate 21. A second annular wall 22 provided on the opposing surface and projecting around the first annular wall 12 outside the first annular wall 12 and covering the entire circumference; The member 2 is fixed to the boss portion 13 of the bottom member 1 by bolting. The bottom member 1 is made of FRP, and the base 11 is fixed to the steel plate 100 with an adhesive 60. [Selection] Figure 5

Description

  The present invention is a bridge useful for preventing water leakage that occurs at a position where a through hole such as a manhole provided in a steel plate such as a bridge pier top end, a pier side end, or a pier column is closed with a lid member. The present invention relates to a water leakage prevention structure and a method of forming the water leakage prevention structure.

Many damages, such as water leakage, stagnant water, and corrosion, have been confirmed as damage to steel bridges, most of which are water leakage from manholes installed at the pier tops.
An existing manhole (when the through-hole is formed in a steel plate installed substantially horizontally) provided at the pier top of the steel bridge is formed in the steel plate 100 constituting the top as shown in FIG. The through hole α is closed with the lid member 101, the peripheral portion of the lid member 101 is overlapped with the peripheral portion of the through hole α, and the overlapped peripheral portions are used with a plurality of bolts 102. Many are bolted.
This bolting is generally performed by inserting the bolt 102 into a through hole formed in the lid member 101 or the steel plate 100 from above and screwing it into a nut 103 fixed under the through hole of the steel plate 100 (for example, , See Patent Document 1).

  Further, manholes provided for intrusion at the pier side end of the steel pier or on the pier column at the time of internal inspection or the like (when the through hole α is formed in the steel plate 100 installed substantially vertically) are shown in FIG. There are a lateral opening type shown in FIG. 10A and a vertical opening type shown in FIG. 10B. The lid member 105 connects the inside of the through hole α and the back surface of the lid member 105. The support arm 106 is provided so as to be openable and closable. The support arm 106 is configured to have an arc-shaped portion formed in an arc shape and a linear portion that is bent at the tip thereof and extends linearly, and one tip portion of each support arm 106 is disposed inside the through hole α. The other end of the lid member 105 is rotatably connected to a hinge portion provided on the back surface of the lid member 105.

JP 2002-317984 A

However, the conventional closed structure of the through hole α (manhole) formed in the substantially horizontal steel plate 100 by the lid member 101 is a structure in which water easily permeates into the overlapped portion of the lid member 101 and the steel plate 100. Moreover, it has the structure which is easy to leak from the clearance gap of the location where a volt | bolt is attached.
In addition, even when a coating film is formed by coating to suppress corrosion, if the opening and closing work of the lid member increases, the corrosion progresses due to deterioration of the coating film, causing cross-sectional defects and causing water leakage Met.

Also, in the closed structure of the through-hole α (manhole) formed by the substantially vertical steel plate by the lid member 105, the peripheral edge of the lid member 105 is abutted with the peripheral edge of the through-hole α and overlapped as necessary. The water flowing down from above through the steel plate 100 penetrates into the overlapped portion of the lid member 105 and the steel plate 100 and corrodes this overlapped portion (FIG. 10). In the periphery of the through-hole α), there was a disadvantage that water leakage occurred.
For this reason, there has been a demand for a new water leakage prevention structure that effectively prevents water leakage caused by a through hole closed by a lid member, such as a manhole of a steel bridge.

  The present invention has been made in view of such circumstances, and has a bridge water leakage prevention structure capable of effectively preventing water leakage at a location where a through hole such as a manhole of a steel bridge is closed with a lid member. The main object is to provide a method for forming this water leakage prevention structure.

In order to achieve the above-described object, the water leakage prevention structure for a bridge according to the present invention is a water leakage prevention structure for preventing water leakage occurring at a location where a through hole formed in a steel plate of a steel bridge is closed by a lid member. A bottom member is fixed to the periphery of the through hole, and a lid member is placed and fixed on the bottom member. The bottom member includes an annular base that is liquid-tightly fixed to the periphery of the through-hole on the surface of the steel plate, a first annular wall that is erected from the annular base, and the base of the base And a boss portion standing outside the first annular wall. The lid member is a top plate provided so as to cover the bottom member, and the bottom member of the top plate is opposed to the top member. And a second annular wall provided on the outer surface of the first annular wall and projecting around the first annular wall around the first annular wall, and the lid member. Is fixed to the boss portion of the bottom member by bolting.

  Therefore, if such a water leakage prevention structure is adopted at a location where the through hole is formed in the substantially horizontal steel plate, the base portion of the bottom member is liquid-tightly fixed to the periphery of the through hole, so the steel plate and the bottom member Since water does not enter between the base portion of the bottom member and the first annular wall is erected from the base portion of the bottom member, the first annular wall blocks water around the through hole. Thus, even when water accumulates on the surface of the steel material, there is no risk of water entering the through hole along the surface of the bottom member. Further, since the second annular wall protrudes from the top plate of the lid member, it is possible to block water that is to be guided to the through hole along the lower surface of the top plate, and the first annular wall. Since the second annular wall is provided outside, it is possible to position the lid member and to prevent displacement of the lid member.

  Furthermore, since the lid member is bolted to the boss portion standing outside the first annular wall, it is possible to attach the tip portion of the bolt so as to be buried in the boss portion. There is no inconvenience that water leaks downward from the gap.

  In addition, since the lid member is bolted to the boss portion after blocking the movement of the water to the through hole by the first annular wall or the second annular wall, in order to improve the adhesion as in the conventional lid member Therefore, it is not necessary to fix with a large number of bolts, and it is possible to increase the work efficiency by reducing the number of bolting points.

Here, it is desirable that the bottom member is made of FRP, and the base of the bottom member is bonded to the surface of the steel plate facing it by an adhesive.
In order to realize such a configuration, it is important to select an adhesive that bonds the FRP and the steel material, but by realizing such a configuration, it becomes easy to fix the bottom member to the steel plate, The number of work days can be greatly reduced.

Moreover, it is good to provide the grating which can contact | abut to the base of a bottom member inside the 1st annular wall in the surface facing the bottom member of a cover member.
By adopting such a configuration, it becomes possible to receive a load by the grating, so that it is possible to prevent an excessive load from being applied to the bolted portion and to increase the strength of the lid member. It becomes possible.

Further, a sealing agent may be attached to the periphery of the base of the bottom member over the surface of the steel plate to ensure liquid tightness between the base of the bottom member and the steel plate.
When the base of the bottom member and the steel plate are joined in a liquid-tight manner with an adhesive, by adopting such a configuration, there is a risk of water entering between the base of the bottom member and the steel plate. It is possible to reliably suppress, and even when the base part of the bottom member and the steel plate are not liquid-tightly joined by an adhesive, a sealing agent is attached to the periphery of the base part, so that the liquid-tight fixed state Can be secured. For this reason, when applying a sealing agent, the adhesive agent does not need to be applied to the whole base part of a bottom member, and management of the strict liquid-tight state by an adhesive agent becomes unnecessary.

  The above configuration is particularly useful when the through hole is formed in a substantially horizontal steel plate, but a similar water leakage prevention structure is also provided when the through hole is formed in a substantially vertical steel plate. It may be adopted. At this time, in order to eliminate the possibility of water entering between the bottom member and the lid member, it is preferable to fix a flange member extending over the entire width of the lid member on the surface of the steel plate located above the through hole. . Such a saddle member may be configured to have a base part that is liquid-tightly joined to the steel plate, a saddle part that is erected substantially vertically from the base part, and a draining part that hangs down from the tip of the saddle part.

  Accordingly, by providing such a saddle member, the saddle member is fixed in a liquid-tight manner over the entire width of the lid member on the surface of the steel plate located above the through-hole, so that it passes upward through the steel plate. Water flowing down from the water is blocked by the eaves member and falls from the side of the through hole or from the front of the through hole. For this reason, water is not guided between the bottom member and the lid member, and it is possible to eliminate the possibility of water leakage through the through hole.

Even in the case of forming a water leakage prevention structure using such a saddle member, the saddle member is made of FRP, and the base of this saddle member is fixed to the steel plate by bonding to the surface of the steel plate facing it with an adhesive. Good.
By setting it as such a structure, the fixation operation | work to the steel plate of a collar member becomes easy, and it becomes possible to reduce work time (work days).

  In addition, as a method of fixing the bottom member made of the above-mentioned FRP to a steel plate using an adhesive to form a water leakage prevention structure for a bridge, the surface of the peripheral edge of the through hole of the steel plate is subjected to a cleansing operation. The base material of the steel sheet is coated with a corrosion-resistant repair agent, and then the base portion of the bottom member is bonded to the surface coated with the corrosion-resistant repair agent, and then the lid member is attached to the bottom member. It is preferable that the second annular wall is placed so as to be arranged around the first annular wall and bolted to the boss portion.

When the bottom member is made of steel, the bottom member must be fixed to the steel plate by welding, and a painting operation is required in addition to the welding operation. On the other hand, when the bottom member is made of FRP, the base of the bottom member can be fixed to the steel plate using an adhesive, and the coating process can be omitted.
The general painting work usually defines the coating specifications for 5-6 layer coating, so it takes a long time, but when the base member of the bottom member is fixed to the steel plate using an adhesive, the coating process is performed. This can be omitted, and the work labor can be greatly reduced and the work time can be greatly shortened.

  In addition, in order to enhance the sealing effect between the bottom member and the steel plate, after joining the base of the bottom member to the steel plate with an adhesive, a step of attaching a sealing agent to the periphery of the base of the bottom member over the surface of the steel plate Further, it may be provided.

  Even when the bridge leakage prevention structure is formed by further using the bridge member formed of FRP, when installing the bridge member, the surface located above the through hole of the steel plate is subjected to a keren work, Applying a corrosion-resistant repair agent to the base of the steel sheet that has been subjected to keren work, and then joining the base portion of the saddle member to the surface coated with the corrosion-resistant repair agent with an adhesive reduces the working time. preferable.

  As described above, according to the present invention, the bottom member is fixed to the peripheral edge of the through hole formed in the steel plate, and the structure in which the lid member is placed and fixed to the bottom member is adopted. An annular base that is liquid-tightly fixed to the peripheral edge of the base, a first annular wall that is erected from the base, and a boss that is erected outside the first annular wall of the base And the lid member is provided on a surface facing the bottom member of the top plate so as to cover the bottom member, and the first member is provided outside the first annular wall. And the second annular wall protruding around the entire circumference of the annular wall, and the lid member is fixed to the boss portion of the bottom member by bolting. While preventing the intrusion of water between the base and the steel plate, the water or the lid member that is guided to the through hole through the surface of the bottom member It is possible to block water that is about to be led to the through hole, and even if water accumulates on the surface of the steel plate or the surface of the lid member, it is possible to avoid the intrusion of water into the through hole Become. Further, since the lid member is bolted to the boss portion provided on the bottom member, there is no inconvenience that water leaks downward from the gap between the bolt and the boss portion, and it is possible to effectively prevent water leakage. .

  Furthermore, since the first and second annular walls eliminate the ingress of water into the through hole and the lid member is bolted and fixed to the boss portion, there is no need to fix with a large number of bolts. The work efficiency can be reduced by reducing the number of locations.

  In addition, the bottom member is made of FRP, and the base of the bottom member is joined to the surface of the steel plate facing it by an adhesive, thereby facilitating the work of fixing the bottom member to the steel plate and reducing the work effort. In addition, the working time (working days) can be greatly reduced.

  Furthermore, when the above-described water leakage prevention structure is adopted when the through hole is formed in a substantially vertical steel plate, the upper part of the lid member is extended over the entire width on the surface of the steel plate located above the through hole. It is preferable to fix the extending eaves member, and by adopting such a configuration, it is possible to eliminate the possibility of water being guided between the bottom member and the lid member.

  In providing such a saddle member, the saddle member has a base part that is liquid-tightly joined to the steel plate, a saddle part that is erected substantially vertically from the base part, and a draining part that hangs down from the tip of the saddle part. This saddle member is made of FRP, and the base part of this saddle member is joined to the surface of the steel plate facing this by an adhesive, so that the fixing work of the saddle member to the steel plate becomes easy, and the work labor is reduced. It is possible to reduce the working time (the number of working days) and to greatly reduce the working time.

1A and 1B are views showing a state in which a bridge water leakage preventing structure according to the present invention is formed by combining a bottom member and a lid member. FIG. 1A is a plan view thereof, and FIG. 1B is a perspective view thereof. FIG. 2: is a figure which shows the bottom part member used in order to form the water leakage prevention structure for bridges based on this invention, (a) is a top view of a bottom part member, (b) is A- of (a). Sectional drawing cut | disconnected by A line, (c) shows sectional drawing cut | disconnected by the BB line of (a). 3A and 3B are views showing a lid member used for forming the bridge leakage prevention structure according to the present invention, wherein FIG. 3A is a plan view of the lid member, and FIG. 3B is a bottom view of the lid member. c) shows a cross-sectional view taken along line AA of (a). 4 is a view showing a state in which the base of the bottom member is fixed to the steel plate by welding, (a) is a cross-sectional view taken along the line AA of FIG. 1, and (b) is a view of B of FIG. It is sectional drawing cut | disconnected by the -B line | wire, FIG. 5 is a view showing a state in which the base of the bottom member is fixed to the steel plate with an adhesive, (a) is a cross-sectional view taken along line AA in FIG. 1, and (b) is in FIG. It is sectional drawing cut | disconnected by the BB line. FIG. 6 is a diagram showing a process for forming a water leakage prevention structure for a bridge, and the number of days and costs required for the process. FIG. 6A illustrates a method (Method I) for fixing a bottom member to a steel plate by welding. Work flow diagram, (b) is a work flow diagram explaining the construction method (construction method II) when the bottom member is fixed to the steel plate with an adhesive, (c) is the work days and costs of construction method I and construction method II It is a table to outline. FIG. 7 is a view showing a water leakage prevention structure used for a through hole of a vertical steel plate, (a) is an overall plan view thereof, and (b) is a cross-sectional view taken along line AA of (a). . FIG. 8 is a view showing a draining scissor member, where (a) is a plan view thereof, (b) is a side view thereof, (c) is a bottom view thereof, and (d) is an X portion of (a). (E) is a sectional view cut along line AA, BB, and CC in (a), and (f) is cut along line DD in (a). FIG. FIG. 9 is a diagram showing a conventional configuration in which a through hole formed in a substantially horizontal steel plate of a steel bridge is closed with a lid member, (a) is a perspective view thereof, and (b) is a sectional view thereof. is there. FIG. 10A is a view showing a state where a through-hole provided in an end portion on the pier side of a steel bridge is closed with a lid member, and a state in which the lid member is opened. FIG. It is a figure which shows the state which obstruct | occluded the through-hole provided in the bridge pier pillar of steel bridges with the cover member, and the state which open | released the cover member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a water leakage prevention structure for a bridge according to the present invention will be described with reference to the accompanying drawings.

  In FIG. 1 to FIG. 5, an example of a water leakage prevention structure that is employed when a through hole (manhole) formed in a steel plate that is substantially horizontal, such as the top of a pier of a steel bridge, is closed with a lid member, The water leakage prevention structure for a bridge is configured by combining a bottom member 1 fixed to a steel plate and a lid member 2 placed on the bottom member 1.

  The bottom member 1 is fixed to the periphery of the through hole α of the steel plate 100. As shown in FIG. 2, the bottom member 1 is fixed to the periphery of the through hole α over the entire circumference, and the annular base 11 The first annular wall 12 is erected from the base portion 11 and the boss portion 13 is erected on the outer side of the first annular wall 12 of the base portion 11.

  The base 11 of the bottom member 1 is formed in an oval shape or a perfect circle so that an opening 14 larger than the through hole α is formed in the center of a flat plate-like material. A plurality of (for example, four) flange portions 15 for forming 13 are extended outward in the radial direction.

  The flange portion 15 is formed integrally with the base portion 11. In this example in which the base portion 11 is formed in an oval shape, the tangent is 45 degrees with respect to the long axis direction so as to protrude in all directions. It is formed so as to protrude perpendicularly to the tangent from the outer peripheral part. The shape of the base 11 and the flange portion 15 may be arbitrarily changed according to the shape of the through-hole α to be installed, and the formation position of the flange portion 15 may also be arbitrarily set according to the attachment location. You may form in an outer peripheral part.

  The first annular wall 12 is vertically fixed in the vicinity of the periphery of the base 11, and the base 11 is formed in a strip-like oval shape along the periphery of the base 11 (as shown in FIG. 1). In some cases, it is formed unbroken across the entire circumference (along a strip-like stop line).

  The boss portion 13 is fixed vertically to a flange portion 15 formed on the peripheral edge of the base portion 11, and a screw hole 13 a for screwing a fastening bolt 30 described later is formed at the center of the boss portion 13. Is formed. The screw hole 13 a of the boss portion 13 is closed and formed with a bottom by the flange portion 15, and the boss portion 13 is formed so that the protruding amount from the base portion 11 is larger than that of the first annular wall 12. Has been. In addition, the screw hole 13a is good also as a bottom by drilling to the middle, without making the boss | hub part 13 penetrate.

  In forming such a bottom member 1, when the bottom member 1 is formed of a steel material, the first annular wall 12 and the boss portion 13 that have been molded in advance are welded to the base 11 around the circumference. It is better to integrate without gaps. When the bottom member 1 is formed of FRP, the first annular wall 12 and the boss 13 can be integrally formed with the base 11, but the base 11, the first annular wall 12, and the boss 13 may be separately molded by FRP and cured, and then the first annular wall 12 and the boss portion 13 may be fixed to the base portion 11 without any gaps using a predetermined lining method.

  And when the bottom member 1 is formed of steel, the bottom member 1 is fixed to the steel plate 100 as shown in FIG. 4 with the peripheral edge (inner peripheral edge and outer peripheral edge) of the base 11 with respect to the steel plate 100. The welding 50 is performed. On the other hand, when the bottom member 1 is formed of FRP, the bottom surface of the base 11 is fixed to the steel plate 100 with an adhesive 60 as shown in FIG. The sealant 61 is attached to the boundary between the peripheral edge (inner peripheral edge and outer peripheral edge) of the steel plate 11 and the steel plate 100 and sealed.

  On the other hand, the lid member 2 is made of FRP in this example. As shown in FIG. 3, the top plate 21 provided so as to cover the bottom member 1 and the lower surface of the top plate A second annular wall 22 extending outward from the first annular wall 12, a flange 23 provided at a location corresponding to the boss 13 of the bottom member 1, and a first annular wall 12 and a grating 24 provided on the inner side.

In this example, the top plate 21 is formed in an oval plate shape in accordance with the outer shape of the base portion 11 of the bottom member 1, but a handle may be provided on the surface.
The second annular wall 22 is suspended near the periphery of the lower surface of the top plate 21 (the surface facing the bottom member). In the state where the lid member 2 is assembled to the bottom member 1, the first annular wall 22 is It arrange | positions outside the annular wall 12, and is formed in the circumference | surroundings of this 1st annular wall 12 without a cut | interruption over the perimeter.

  The flange portion 23 is formed so as to protrude in four directions from the peripheral edge of the top plate 21 in accordance with the projecting direction of the flange portion 15 (boss portion 13) of the bottom member 1, and is tangent to the major axis direction. Is formed so as to be perpendicular to the tangent line from a part where the angle is 45 degrees and to be on the same plane with respect to the top plate 21. The flange portion 23 is formed with a through hole 23a for inserting a fastening bolt.

  Further, the grating 24 is formed of the same material as the top plate 21 and is attached to the lower surface of the top plate 21 and is formed in a lattice shape in which the outer shape is an oval shape. It is formed so as to be located inside the wall 12 and located outside the inner peripheral edge of the base 11 of the bottom member 1.

  The projecting amount of the second annular wall 22 from the top plate 21 is the same as the projecting amount of the first annular wall 12, and the projecting amount of the grating 24 from the top plate 21 is the same as that of the boss portion 13. They are formed with the same amount of protrusion. Therefore, in the state where the flange portion 23 of the lid member 2 is placed on the boss portion 13, the grating 24 contacts the surface of the base portion 11 of the bottom member 1, but the first annular wall 12 and the second annular wall The tip of 22 does not come into contact with the opposing member, and is between the first annular wall 12 and the top plate 21 of the lid member 2 and between the second annular wall 22 and the base 11 of the bottom member 1. In this case, a gap is formed.

  Although it can be considered that the tip of the annular wall (the first annular wall 12 and the second annular wall 22) is brought into contact with the other member, the lid member 2 and the bottom member 1 are formed by FRP. In this case, the contact state at the tip of the annular wall becomes uneven due to the surface roughness generated at the time of molding, and there may be inconveniences such as rattling when the bottom member 1 and the lid member 2 are assembled. Therefore, in order to avoid such an inconvenience, the tips of the annular walls (the first annular wall 12 and the second annular wall 22) are intentionally separated from the counterpart member. Therefore, since the annular wall (the first annular wall 12 and the second annular wall 22) cannot secure the strength of the water leakage prevention structure (strength of the lid member 2), the lid member is used to ensure the strength. A grating 24 is provided inside the second second annular wall 22, and the grating 24 is brought into contact with the base 11 of the bottom member 1.

  Here, the lid member 2 has the second annular wall 22 and the grating 24 made of FRP in advance, and before the top plate 21 is formed of FRP and cured, the second annular wall 22 and the grating 24 are placed on the ceiling. It is good to put in the predetermined location of the board 21, harden as it is, and to integrate.

  The bottom member 1 and the lid member 2 are arranged such that the second annular wall 22 is arranged around the first annular wall 12 (the first annular wall 12 is grating with the second annular wall 22). The lid member 2 is placed on the bottom member 1 so that the flange portion 23 of the lid member 2 and the boss portion 13 of the bottom member 1 are aligned, and then the fastening bolt 30 is lidded. The lid member 2 is fixed to the bottom member 1 by being inserted from the through hole 23 a of the flange portion 23 of the member 2 and screwed into the screw hole 13 a of the boss portion 13 of the bottom member 1.

Next, a method for forming the water leakage prevention structure by installing the above-described bottom member 1 and lid member 2 in the through hole α formed in the steel plate 100 in the above configuration will be described.
First, the construction method (construction method I) for forming the water leakage prevention structure when the bottom member 1 is made of steel will be described. As shown in FIG. 6 (a), the peripheral surface of the through hole α of the steel plate 100 is shown. Keren work (type 3 keren) (step 11), then, the base 11 of the bottom member 1 is placed on the surface of the steel plate 100 subjected to keren work, and the periphery of the base 11 is joined by welding without any gap (step) 12).

Thereafter, repair coating is performed to repair the existing coating damaged by welding (step 13). Since this repair coating is based on 5 to 6 layers, the coating (undercoating, intermediate coating, and top coating) is repeated 5 to 6 times and repeated.
Thereafter, the coating state is dried and trained (step 14), and the lid member 2 is placed on the bottom member 1 so that the second annular wall 22 is disposed outside the first annular wall 12, and the lid member 2 is placed. The lid member 2 is installed by bolting the flange portion 23 to the boss portion 13 of the bottom member 1 (step 15).

  Therefore, in this construction method I, as shown in FIG. 6 (c), it takes 1 day for the cleansing work and the welding work, 5 days for the painting work, and 1 day for the drying training and the lid installation work. It is possible to finish the work in a day.

  On the other hand, as shown in FIG. 6 (b), the construction method (construction method II) for forming the water leakage prevention structure when the bottom member 1 is formed of FRP is the surface of the periphery of the through hole α of the steel plate 100. Is then applied to the surface subjected to the cleansing operation (step 22), and after drying, the base of the bottom member is bonded to the surface applied with the anticorrosive repair agent. Join at 60 (step 23).

  As a corrosion-resistant repairing agent applied to the base material of the steel sheet 100 subjected to the Keren work, it is good to use a brushable ceramic white (manufactured by ITW Performance Polymers & Fluids Japan Co., Ltd.). For example, an acrylic adhesive known as PLEXUS MA530, which is an adhesive for structural materials manufactured by ITW, may be used as the adhesive 60 for bonding the steel plate and the steel plate.

Thereafter, in order to more surely suppress the risk of water entering between the base and the steel plate, the sealing agent 61 is applied to the peripheral edge (inner peripheral edge and outer peripheral edge) of the base of the bottom member over the surface of the steel sheet as necessary. Adhere (step 24).
As the sealant 61 for sealing the boundary between the peripheral edge (inner peripheral edge and outer peripheral edge) of the base 11 and the steel plate 100, a methacrylate adhesive known as PLEXUS MA830, which is an adhesive for structural materials of ITW, is used. Use it.

In the construction method II using the adhesive 60, since heat treatment is not required, there is no risk of damage to the coating film, and no repair coating is required. Thus, no painting work is required, and the lid member 2 is used as it is. The flange member 23 of the lid member 2 is bolted to the boss portion 13 of the bottom member 1 to install the lid member 2 (step 25).
Therefore, in this construction method II, the work from the keren work to the installation of the lid member 2 is completed in about two days.

  Therefore, if the above-described water leakage prevention structure is employed for the through hole α formed in the substantially horizontal steel plate 100, the base 11 of the bottom member 1 is liquid-tightly fixed to the periphery of the through hole α. This is a case where water does not enter between the base 11 of the bottom member 1 and the first annular wall 12 is erected from the base 11 of the bottom member 1 so that water accumulates on the steel plate surface. However, there is no risk of water entering the through hole α along the surface of the base 11. Further, since the second annular wall 22 is suspended from the top plate 21 of the lid member 2, water that is guided to the through hole α through the top plate 21 can also be blocked. The annular wall 22 makes it possible to position the top plate 21 and to prevent displacement.

Further, the lid member 2 is bolted to the boss portion 13 erected outward from the first annular wall 12 of the bottom member 1 (the fastening bolt 30 has a bottomed shape of the boss portion 13). Therefore, there is no inconvenience that water leaks downward from the gap between the fastening bolt 30 and the boss portion 13.
In addition, the lid member 2 is bossed in a state where the first annular wall 12 blocks water around the through hole α and the second annular wall 22 blocks the water transferred to the lid member 2. Since it bolts to the part 13, in order to improve adhesiveness like the conventional lid member, it is not necessary to fix a lid member using many bolts. For this reason, it becomes possible to suppress the place of bolting to the minimum, and it becomes possible to reduce work efficiency significantly.

  Further, when the bottom member 1 is constituted by FRP and the base 11 of the bottom member 1 is joined to the surface of the steel plate 100 facing it by the adhesive 60, the bottom member 1 is fixed to the steel plate 100. Since the work becomes easy and the painting work is unnecessary, the work time (work days) can be greatly reduced as described above, and the work cost is also greatly increased as shown in FIG. 6 (c). It becomes possible to reduce it.

  Furthermore, in the above-described configuration example, after the base 11 of the bottom member 1 is bonded to the steel plate 100 with an adhesive, the sealing agent 61 is attached to the periphery of the base 11 of the bottom member 1 over the surface of the steel plate 100. In addition, it is possible to more reliably suppress the risk of water entering between the base 11 of the bottom member 1 and the steel plate 100. For this reason, when using the sealing agent 61 and ensuring the liquid-tightness between the base 11 of the bottom member 1 and the steel plate 100, it is not necessary to manage the liquid-tight state with the adhesive 60, and the base of the bottom member It is possible to ensure liquid-tightness even when no adhesive is applied to the whole.

  Furthermore, since a grating 24 that contacts the base 11 of the bottom member 1 is provided on the inner surface of the first annular wall 12 on the surface of the lid member 2 facing the bottom member 1, the lid member It becomes possible to receive the external load concerning 2 and to prevent an excessive load from being applied to the flange 23 to be bolted.

  The above configuration is particularly useful when the through-hole α is formed in the steel plate 100 that is substantially horizontal, but also when the through-hole α is formed in a steel plate that is substantially vertical, FIG. As shown in FIG. 7, a similar water leakage prevention structure may be employed. At this time, since the lid member 2 may be a laterally open type or a vertical open type, the flange portion 15 of the bottom member 1 and the flange portion 23 of the lid member 2 are provided as necessary. (In FIG. 7, the flange portion of the bottom member 1 and the flange portion of the lid member 2 are omitted, and the lid member 2 is rotatably connected to the inside of the through hole α and the back surface of the lid member 2. It is supported so that it can be opened and closed via a support arm (not shown).

  In such a configuration, the second annular wall 22 of the lid member 2 comes into contact with the first annular wall 12 of the bottom member 1 due to the weight of the lid member 2, and water flowing down from above through the steel plate 100 flows into the bottom member. Although it becomes difficult to enter between 1 and the cover member 2, in order to prevent water leak more reliably, the collar member 70 extended over the full width of the cover member 2 on the surface of the steel plate 100 located above the through-hole (alpha). Is preferably fixed so as not to interfere with the lid member 2.

  As an example of such a flange member 70, as shown in FIG. 8, a base 71 that is liquid-tightly joined to the steel plate 100, a flange 72 that is erected substantially vertically from the base 71, and the flange 72 and a draining portion 73 that hangs down parallel to the base 71 from the tip of 72.

  The collar portion 72 is formed such that the standing amount (projection amount) from the steel plate 100 is larger than the distance from the steel plate 100 on the surface of the lid member 2 attached to the bottom member 1. Thus, the dripped water will fall in front of the surface of the lid member 2 and will not be dripped between the bottom member 1 and the lid member 2.

  In this example, the eaves member 70 is formed in a wide range in an inverted U shape so as to cover both sides and the upper side of the lid member 2, and in order to ensure strength, the base 71 and the draining portion 73 Reinforcing ribs 74 are provided in a lattice shape between them.

  Such a saddle member 70 is also made of FRP as a whole, and the base 71 of the saddle member 70 is fixed to the steel plate by bonding to the surface of the steel plate 100 facing it with an adhesive. In order to reliably prevent the member 70 from falling, as shown in FIG. 8 (f), predetermined locations (in this example, a total of four locations on both sides and the upper portion) are supplementary to the steel plate 100. It may be bolted.

  The construction method for fixing the eaves member 70 to the steel plate 100 with an adhesive is also the same as the construction method II described above. After that, the base of the saddle member is bonded to the surface coated with the anticorrosive repair agent using the above-mentioned adhesive, and if necessary, a sealant is applied to the periphery of the base of the bottom member over the surface of the steel plate. Good.

  Therefore, by providing such a flange member 70, the base 71 of the flange member 70 is fixed to the surface of the steel plate 100 located above the through hole α in a liquid-tight manner over the entire width of the lid member 2. Therefore, the water flowing down from above through the steel plate 100 is blocked by the eaves member 70, falls from the side of the lid member 2 or from the front, and is not guided between the bottom member 1 and the lid member 2, It is possible to eliminate the risk of water leakage through the through hole α. Also, by adopting the above-described method II for the eaves member 70, it is possible to greatly reduce the work labor, and it is possible to greatly reduce the work time (work days). .

  In the above-described configuration, an example in which FRP is used as the lid member 2 has been described. However, the lid member is not limited to FRP, and may be configured of a resin material or a steel material.

DESCRIPTION OF SYMBOLS 1 Bottom member 2 Lid member 11 Base 12 First annular wall 13 Boss part 15 Flange part 21 Top plate 22 Second annular wall 23 Flange part 24 Grating 60 Adhesive 61 Sealing agent 70 Gutter member 71 Base 72 Gutter 73 Draining Part 100 Steel plate α Through hole

Claims (9)

A water leakage prevention structure for a bridge for preventing water leakage occurring at a location where a through hole formed in a steel plate of a steel bridge is closed by a lid member,
A bottom member is fixed to the periphery of the through hole, and a lid member is placed and fixed to the bottom member.
An annular base that fixes the bottom member liquid-tightly to the periphery of the through-hole on the surface of the steel plate, a first annular wall that is erected from the annular base, and the base And a boss portion standing outside the first annular wall.
The lid member is provided on a top plate provided so as to cover the bottom member, and a surface of the top plate facing the bottom member, and the first annular wall is provided outside the first annular wall. And a second annular wall protruding around the entire circumference of the
A bridge water leakage prevention structure, wherein the lid member is fixed to the boss portion of the bottom member by bolting.
  2. The bridge according to claim 1, wherein the bottom member is configured by FRP, and is fixed to the steel plate by bonding the base portion of the bottom member to the surface of the steel plate facing the base member with an adhesive. Water leakage prevention structure.   The surface of the lid member facing the bottom member is provided with a grating capable of contacting the base portion of the bottom member inside the first annular wall. 2. Bridge leakage prevention structure according to 2.   4. The water leakage prevention structure for a bridge according to claim 1, wherein a sealant is attached to a periphery of the base portion of the bottom member over the surface of the steel plate. 5. In the case where the through hole is formed in a substantially vertical steel plate,
Fixing a flange member extending over the entire width of the lid member on the surface of the steel plate located above the through hole;
The saddle member has a base portion that is liquid-tightly joined to the steel plate, a saddle portion that is erected substantially vertically from the base portion, and a draining portion that hangs down from the tip of the saddle portion. The water leakage prevention structure for a bridge according to any one of claims 1 to 4.   6. The bridge according to claim 5, wherein the flange member is made of FRP, and is fixed to the steel plate by bonding the base portion of the flange member to the surface of the steel plate facing the flange member with an adhesive. Water leakage prevention structure. A method for forming a water leakage prevention structure for a bridge according to claim 2,
Keren work the peripheral surface of the through hole of the steel plate,
Applying a corrosion-resistant repairing agent to the base of the steel plate that has undergone this keren work,
Thereafter, the base of the bottom member is bonded to the surface coated with the corrosion-resistant repair agent by an adhesive,
Thereafter, the lid member is placed on the bottom member so that the second annular wall is disposed around the first annular wall, and is bolted to the boss portion. Method for forming water leakage prevention structure.   8. The bridge structure according to claim 7, further comprising a step of attaching a sealing agent to a periphery of the base portion of the bottom member over the surface of the steel plate after joining the base portion of the bottom member with an adhesive. Method for forming water leakage prevention structure. A method for forming a leakage prevention structure for a bridge by further using the eaves member according to claim 6,
In installing the saddle member,
Keren work the surface located above the through hole of the steel plate,
Applying a corrosion-resistant repairing agent to the base of the steel plate that has undergone this keren work,
9. The method for forming a leakage preventing structure for a bridge according to claim 7 or 8, wherein the base portion of the eaves member is bonded to the surface coated with the corrosion-resistant repair agent with an adhesive.

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