JP2006299750A - Drain bolt-nut and stagnant water preventive drain structure of steel box using this drain bolt-nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain bolt-nut dispensing with welding. <P>SOLUTION: In this stagnant water preventive drain structure of a steel box, a through-hole 131 is formed in a bottom plate 113 of a steel box-shaped structure, and water in the steel box-shaped structure is dropped and drained from its through-hole 131, and a drain bolt 1A is inserted from one into the through-hole 131 via the bottom plate 113, and a drain nut 1B is threadedly arranged in the other of its bottom plate 131, and a series of drain flow passages 13, 14 and 15 are formed in its drain bolt 1A and the drain nut 1B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is for draining water inside a steel box girder of a bridge, a pier, or such a steel box-shaped structure, and in particular, using bolts for fatigue durability and rust prevention of steel members. The present invention relates to a drain bolt / nut with improved capacity and the like, and a drain structure for preventing water leakage in a steel box using the bolt.

  Steel box girders, etc. that make up bridges can be corroded by internal dew condensation, etc., due to water intruding through gaps in joints, etc. Conventionally, water drainage and dehumidifiers that have entered the steel box have been used. Rust prevention measures are taken. Conventional measures include those disclosed in Japanese Patent Application Laid-Open No. 2003-89888. FIG. 9 is a partially cutaway schematic perspective view showing a bridge girder of a bridge composed of steel box girders described in the publication.

  In this bridge girder, a steel box girder 110 is constructed on the lower surface of the floor plate 100. Two steel box girders 110 are provided on the left and right sides of the horizontal girder 120, and are parallel to the length direction of the floor board 100. An upper flange 111 is disposed on the lower surface of the floor plate 100, and a lower flange 113 is connected via the upper flange 111 and the web 112. Inside the steel box girder 110, an end diaphragm 114 is arranged and partitioned in the length direction, and other reinforcing ribs 115 and vertical ribs 116 are provided. And a pair of parallel steel box girders 110 and 110 are connected by a horizontal girder 120 provided therebetween.

The steel box girder 110 is provided with a drainage structure for preventing stagnant water at an appropriate portion of the lower flange 113. FIG. 10 is a cross-sectional view showing a water drainage prevention water drainage structure of a steel box configured in the component box girder 110. In the drainage portion 130, a drain pipe 132 is provided in a through-hole 131 formed in the lower flange 113, and a rubber damper 133 is attached to the opening of the drain pipe 132. The damper 133 is always pressed against the opening with a spring or made of a steel plate with a rubber plate attached to the contact surface with the opening.
Accordingly, rainwater or the like that has entered the steel box girder 110 from the gap flows through the lower flange 113 and flows into the through hole 131 of the water drainage portion 130. Such water flows in the drain pipe 132 and accumulates at the tip closed by the damper 133. When the pressure increases, the damper 133 opens and drains as indicated by a two-dot chain line. After draining, the damper 133 closes the opening of the drain pipe 132 by its own weight as shown by the solid line.
Japanese Patent Laying-Open No. 2003-89888 (page 3, FIG. 1, FIG. 4)

  However, the water drainage prevention drainage structure of the steel box shown in FIG. 10 is a structure in which the drain pipe 132 is fitted into the through hole 131 drilled in the lower flange 113 and is attached by welding from the outside of the steel box. While the fatigue durability of the steel member decreased, the steel member was affected by rusting from the weld non-welded part. That is, since stress is concentrated in the through hole of the lower flange 113, fatigue is large compared to other portions, and durability is reduced due to the influence of rust.

Further, the drain pipe 132 is usually welded on the circumference along the outer circumference of the through hole 131 from the outside of the steel box girder 110, that is, the lower side of the lower flange 113. Then, in the steel box girder 110, the bare metal on the end face of the drain pipe 132 is exposed, or the rust-proof coating is peeled off by the heat of welding, and rust is generated from such a place. If rust is generated even in part, the corrosion progresses and rust water falls from the drain pipe 132.
Furthermore, since the drainage structure for preventing water stagnation of the steel box has to be welded to the circumference of the drainage pipe 31, the welding itself is a troublesome work. In addition, the drainage pipe 132 that protrudes from the steel box girder 110 as a bridge pier also deteriorates the appearance.

  Therefore, an object of the present invention is to provide a drain bolt and nut that do not require welding and a drain structure for preventing water stagnation of a steel box using the same.

  The drain bolt / nut according to the present invention comprises a drain bolt attached to a drain through hole formed in a plate material, and a drain nut screwed to the drain bolt, and the drain bolt The drainage nut is formed with a series of drainage channels.

Further, the drain bolt and nut according to the present invention, the drain bolt is formed with a plurality of drain holes penetrating the bolt head, and a guide groove extending to the drain hole and interfering with the screw portion, The drainage nut has a plurality of drainage grooves formed on the side of the seat that contacts the bottom surface, and the drainage bolt, the drainage nut and the drainage groove, the guide groove and the drainage hole communicate with each other. It is preferable that the water drainage channel is constructed.
Further, the drain bolts and nuts according to the present invention are respectively formed in numbers and sizes so that the drain bolts and drain nuts partially overlap the drain holes and guide grooves and drain grooves. It is preferable that

  On the other hand, in the water drainage prevention structure for steel boxes according to the present invention, a through hole is formed in the bottom plate of the steel box-shaped structure, and the water in the steel box-shaped structure is dropped from the through hole to drain the water. The drainage bolt is inserted into the through hole from one side through the bottom plate, and the drainage nut is screwed on the other side of the bottom plate. The drainage bolt and the drainage nut Is characterized in that a series of drainage channels are formed.

Further, the water drainage prevention drainage structure of the steel box according to the present invention includes a plurality of drainage holes penetrating the bolt head in the drainage bolt, and a guide groove extending to the drainage hole and interfering with the screw part. The drainage nut is formed with a plurality of drainage grooves on the side of the seat that comes into contact with the bottom surface. The drainage bolt, drainage nut, and drainage groove, guide groove, and drainage hole are screwed. It is preferable that the drainage flow path is configured by communicating with each other.
Further, in the water drainage prevention structure for steel box according to the present invention, the drain bolt is inserted into the through hole from below the bottom plate, and the drain nut is screwed on the upper side of the bottom plate that has penetrated. Preferably there is.

Moreover, it is preferable that the drainage structure for preventing water stagnation of the steel box according to the present invention is a structure in which a washer is sandwiched and adhered between the lower surface of the bottom plate and the bolt head of the drainage bolt.
Further, in the drainage structure for preventing water stagnation of the steel box according to the present invention, the drain bolts and drain nuts have a number and sizes such that a plurality of drain holes, guide grooves and drain grooves partially overlap. Are preferably formed.

  Therefore, according to the drainage bolt and nut according to the present invention and the drainage structure for preventing water stagnation of the steel box using the same, in the steel box constituting the steel box girder or the pier of the bridge, etc., without using welding. It becomes a simple drainage structure for preventing stagnation by simply screwing and attaching a drain bolt and a drain nut. And since welding was made unnecessary, generation | occurrence | production of rust can be eliminated at the point and the fall of durability of the steel box by fall of rust water and corrosion of rust can be prevented.

Next, an embodiment of a drainage bolt / nut according to the present invention and a drainage structure for preventing water stagnation of a steel box using the same will be described below with reference to the drawings.
The drainage structure for preventing stagnant water according to the present embodiment is provided on a steel box girder or a steel box-shaped bridge pier constituting the bridge, similar to that shown in FIG. Therefore, for example, a steel box girder has an upper flange disposed under a floor plate as described above, and the lower flange is connected to the upper flange via a web. In the case of a steel box girder, for example, a steel box having a length of about 10 to 12 m is manufactured in a factory, and is connected at the site to constitute a bridge girder. The water draining structure for preventing water stagnating in a steel box is configured for each steel block of one block.

  Next, FIG. 1 is a view showing a first embodiment of a water draining structure for preventing stagnant water. In the water drainage prevention water drainage structure of the present embodiment, a through hole 131 is formed in a lower flange 113 of a steel box girder, and a drain bolt / nut 1 is attached thereto, as in the conventional example. . The drain bolt / nut 1 is attached so as to close the through hole 131 of the lower flange 113, and the water in the steel box girder is discharged to the outside through the drain passage formed in itself (from the upper side to the lower side of the drawing). ) Try to drain. FIG. 2 is a view showing a drain bolt constituting the drain bolt / nut 1, and FIG. 3 is a view showing a drain nut constituting the drain bolt / nut 1.

Such drain bolt 1A and drain nut 1B are obtained by processing commercially available bolts and nuts, and are configured as follows.
First, as the drainage bolt 1A, one having an outer diameter of the screw portion 11 slightly smaller than the through hole 131 of the lower flange 113 is used, and the drainage hole 13 penetrating in the axial direction is formed in the bolt head 12. Yes. The drain hole 13 is formed at a position where the drain hole 13 interferes with the screw portion 11 when viewed in the axial direction, and a guide groove 14 is formed in the screw portion 11 so as to extend from the drain hole 13. The guide groove 14 is formed as far as the bolt tip so as to cross the male screw formed in the screw portion 11. Such drain holes 13 and guide grooves 14 are provided at two symmetrical positions across the central axis.

On the other hand, as shown in FIG. 1, the drainage nut 1 </ b> B has a drainage groove 15 formed on the seat surface side that comes into contact with the lower flange 113 when the drainage bolt 1 </ b> A is screwed. The drainage nut 1B is a hexagonal nut having six side surfaces, and a female thread is cut into a screw hole penetrating the center to form a threaded portion 16. And the drainage groove 15 is formed in the seat surface side so that it may penetrate from the screw part 16 to the side surface side, and the three drainage grooves 15 are radially arranged every other side surface at equal intervals.
The drain bolt / nut 1 of the present embodiment is such that such drain bolt 1A and drain nut 1B are screwed, and both members are made of stainless steel, for example, as a rust countermeasure.

  Such drain bolts and nuts 1 are mounted in through holes 131 formed in the lower flange 113 as shown in FIG. As shown in the drawing, the threaded portion 11 of the drain bolt 1A is inserted from the lower side of the lower flange 113, and the drainage nut 1B is screwed to the threaded portion 11 that passes through the upper side of the lower flange 113. At this time, since the guide groove 14 is formed in the screw portion 11 of the drain bolt 1A and the drain groove 15 is formed in the screw portion 16 of the drain nut 1B, the tightening force is higher than that of the normal bolt / nut 1. Although it becomes small, since the drain bolt and nut 1 of this embodiment is not used for fastening of members, the drain bolt and nut 1 may be the extent which does not loosen. However, since the life span of the bridge is long, a double nut can be considered when a sufficient tightening force corresponding to the bridge cannot be secured.

  Then, a drainage flow path is formed from the drainage groove 15 to the guide groove 14 and the drainage hole 13 by screwing the drainage nut 1B to the drainage bolt 1A. In this embodiment, the drain bolt 1A has two drain holes 13 and a guide groove 14 and the drain nut 1B has three drain grooves 15. However, the drain bolt 1A and the drain nut The tightening position of 1B cannot be determined uniquely. Accordingly, the size of the diameter of the drainage hole 13 (the width of the guide groove 14 associated therewith) and the depth and width of the drainage groove 15 together with the above-described tightening force are some drainage due to the overlap of the drainage groove 15 with respect to the two guide grooves 14. It is formed with dimensions that can secure the flow rate.

  Therefore, in the drainage structure for preventing water stagnation having such a configuration, when rainwater entering from a gap or water generated by condensation has accumulated in the steel box girder constituting the pier, it is provided in the through hole 131 of the lower flange 113. The water is drained from the drain bolt / nut 1. Specifically, the water accumulated in the lower flange 113 in the steel box girder enters the drainage groove 15 formed in the drainage nut 1B, and the guide groove 14 of the drainage bolt 1A overlapped with the drainage groove 15. Then, the water is drained so as to fall from the drain hole 13.

  Therefore, according to the present embodiment, since the drain pipe is not welded to the steel box girder unlike the conventional drainage structure for preventing water stagnation, the drainage bolt and nut 1 can be easily attached. Work has been greatly simplified. In this embodiment, since the stainless steel drain bolt / nut 1 is simply attached without welding, the occurrence of rust can be eliminated. Therefore, it was possible to prevent a drop in the durability of the steel box girder due to rust water dropping or corrosion due to rust.

Further, since the drain bolt / nut 1 is formed by processing a commercially available product, it is possible to reduce the cost of the drainage structure for preventing stagnant water in combination with the ease of installation work.
Furthermore, in the conventional structure, since the drain pipe protruded from the steel box girder so that water does not flow on the surface of the steel box girder, the appearance was not good, but in this embodiment where the drain bolt / nut 1 is attached, From the aspect of function, water falls from the drain hole 13 of the drain bolt 1A so that it does not flow on the surface of the steel box girder and leave the scale, and from the design aspect, it seems to be a drain outlet. The appearance of the steel box girder is improved due to the functional beauty of the bolts.

  Next, FIG. 4 is the figure which showed 2nd Embodiment of the draining structure for stagnant water prevention. The drainage structure for preventing stagnant water according to the present embodiment is provided in a steel box girder constituting a bridge as in the first embodiment, and a drain bolt is provided in a through hole 131 formed in the lower flange 113. -The nut 2 is attached. The drain bolt / nut 2 is attached so as to close the through hole 131, and tries to drain the water in the steel box girder outside (from the top to the bottom of the drawing) through the drain passage formed in itself. Is. FIG. 5 is a view showing a drain bolt constituting the drain bolt / nut 2, and FIG. 6 is a view showing a drain nut constituting the drain bolt / nut 2.

The drain bolt 2A and drain nut 2B of the present embodiment are also obtained by processing commercially available bolts and nuts, but the following processing different from that of the first embodiment is performed.
First, as the drainage bolt 2A, one having an outer diameter of the screw portion 21 slightly smaller than the through hole 131 of the lower flange 113 is used, and the drainage hole 23 penetrating in the axial direction is formed in the bolt head 22. Yes. The drain hole 23 is formed at a position that interferes with the screw portion 21 when viewed in the axial direction, and a guide groove 24 is formed in the screw portion 21 so as to extend from the drain hole 23.

The guide groove 24 is formed up to the bolt tip so as to cross the male screw formed in the screw portion 21. In the present embodiment, such drain holes 23 and guide grooves 24 are formed at four locations at equal intervals of 90 degrees with the central axis as a fulcrum.
One drainage nut 2B is formed with a drainage groove 25 on the seat surface side that comes into contact with the lower flange 113 when screwed to the drainage bolt 2A as shown in FIG. In the drainage nut 2B of the present embodiment, drainage grooves 25 that open to the screw portions 26 in which female threads are formed on all six side surfaces are formed radially. And as for such drain bolt 2A and drain nut 2B, the thing made from stainless steel is used as a rust countermeasure.

  When the steel box girder is assembled at the factory, the drain bolt / nut 2 is attached to a through hole 131 formed in the lower flange 113 as shown in FIG. The threaded portion 21 of the drain bolt 2A is inserted from the lower side of the lower flange 113, and the drainage nut 2B is screwed to the threaded portion 21 that passes through the upper side of the lower flange 113. If a sufficient tightening force cannot be secured at this time, a double nut may be considered.

  In the drain bolt / nut 2, a drain passage is formed from the drain groove 25 to the guide groove 24 and then to the drain hole 23. In the present embodiment, four drain holes 23 and guide grooves 24 are formed in the drain bolt 2A, and six drain grooves 25 are formed in the drain nut 2B. This is because the tightening positions of the drain bolt 2A and the drain nut 2B cannot be uniquely determined, so that the drain grooves 25 and the guide grooves 24 partially overlap at a plurality of locations. In this way, the total communication portion of each guide groove 24 and drainage groove 25 can secure a sufficient flow rate for drainage. Therefore, the size of the diameter of the drainage hole 23 (the width of the guide groove 24 associated therewith) and the depth and width of the drainage groove 25 are formed so as to ensure a certain amount of drainage flow together with the tightening force described above.

  Therefore, in the drainage structure for preventing water stagnation with such a configuration, when rainwater or water generated by condensation has entered the steel box girder constituting the pier from the gap of the joint portion or the like, such water is collected in the lower flange 113. The water is drained from the drain bolt / nut 2 provided in the through hole 131. Specifically, the water accumulated in the lower flange 113 in the steel box girder enters the drainage groove 25 formed in the drainage nut 2B, and the guide groove 24 of the drainage bolt 2A that overlaps the drainage groove 25. The water transmitted through the water is drained so as to fall from the drain hole 23.

  Therefore, according to the present embodiment, since the drain pipe is not welded to the steel box girder unlike the conventional drainage structure for preventing water stagnation, the drainage bolt and nut 2 can be simply attached. Work has been greatly simplified. In this embodiment, since the stainless steel drain bolt / nut 2 is simply attached without welding, the occurrence of rust can be eliminated. Therefore, it was possible to prevent a drop in the durability of the steel box girder due to rust water dropping or corrosion due to rust.

Further, since the drain bolt / nut 2 is formed by processing a commercially available product, it is possible to reduce the cost of the drainage structure for preventing stagnant water in combination with the ease of installation work.
Furthermore, in the conventional structure, since the drain pipe protruded from the steel box girder so that water does not flow on the surface of the steel box girder, the appearance was not good, but in this embodiment where the drain bolt / nut 2 is attached, From the aspect of function, water falls from the drain hole 23 of the drain bolt 2A, so that it does not flow on the surface of the steel box girder and does not leave scale, and from the design aspect, it seems to be a drain outlet. The appearance of the steel box girder is improved due to the functional beauty of the bolts.

In addition, although the embodiment was shown and demonstrated about the draining structure for water stagnation prevention of the steel box which concerns on this invention, this invention is not necessarily limited to such a thing, A various change is possible in the range which does not deviate from the meaning. It is.
In the above embodiment, the bolt head 12 of the drain bolt 1A is brought into direct contact with the lower flange 113. For example, a washer 17 is provided between the lower surface of the lower flange 113 and the bolt head 12 as shown in FIG. You may make it stick | pinch and make it closely_contact | adhere. Thus, the water flowing through the guide groove 14 does not travel along the lower surface of the lower flange 113, that is, the surface of the steel box girder, but is drained so as to fall from the drain hole 13. Yes.

  Further, in the drainage structure for preventing water stagnation of the embodiment, the drainage bolt 1A is inserted into the through hole 131 of the lower flange 113 from below, and the drainage nut 1B is screwed upward. . However, conversely, as shown in FIG. 8, the drain bolt 1C may be inserted into the lower flange 113 from above, and the drain nut 1B may be screwed through the washer 18 below. In this case, the drain head 19 is formed in the bolt head 12 of the drain bolt 1C in the same manner as the drain nut 1B so that the water in the steel box girder flows in the guide groove 14, and the drain nut 1B and the lower flange 113 are formed. A washer 18 is sandwiched between them so that water does not travel on the lower surface of the lower flange 113, that is, the surface of the steel box girder.

It is the figure which showed 1st Embodiment of the draining structure for stagnant water prevention. It is the figure which showed the drain bolt of 1st Embodiment. It is the figure which showed the drain nut of 1st Embodiment. It is the figure which showed 2nd Embodiment of the draining structure for stagnant water prevention. It is the figure which showed the drain bolt of 2nd Embodiment. It is the figure which showed the drain nut of 2nd Embodiment. It is the figure which showed the modification of the draining structure for stagnant water prevention. It is the figure which showed the modification of the draining structure for stagnant water prevention. It is a partial notch schematic perspective view which showed the bridge girder of the bridge comprised with the steel box girder. It is sectional drawing which showed the water draining structure for the stagnant water prevention of the conventional steel box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain bolt nut 1A Drain bolt 1B Drain nut 11 Screw part 12 Bolt head 13 Drain hole 14 Guide groove 15 Drain groove 16 Screw part 113 Lower flange 131 Through hole

Claims (8)

It consists of a drain bolt attached to the drainage through hole formed in the plate material, and a drain nut screwed to the drain bolt,
A drain bolt and nut characterized in that a series of drain passages are formed in the drain bolt and drain nut. In the drain bolt and nut according to claim 1,
The drain bolt has a plurality of drain holes penetrating the bolt head, and a guide groove that extends to the drain hole and interferes with the screw portion. The drain nut has a seat that contacts the bottom surface. A plurality of drainage grooves are formed on the surface side, and the drainage bolt, drainage nut, and drainage groove are connected to the guide groove and drainage hole to form a drainage channel. Drain bolts and nuts characterized by being. In the drain bolt and nut according to claim 2,
The drainage bolts and drainage nuts are each formed in numbers and sizes so that a plurality of drainage holes and guide grooves and drainage grooves partially overlap each other. nut. In the water drainage prevention structure of the steel box where the through hole is formed in the bottom plate of the steel box-shaped structure, and the water in the steel box-shaped structure is dropped and drained from the through hole,
A drain bolt is inserted into the through-hole from one side through the bottom plate, and a drain nut is screwed on the other side of the bottom plate. The drain bolt and the drain nut include a series of drain channels. A water drainage structure for preventing stagnant water in a steel box, characterized in that is formed. In the water drainage prevention structure for water leakage prevention of the steel box according to claim 4,
The drain bolt has a plurality of drain holes penetrating the bolt head, and a guide groove that extends to the drain hole and interferes with the screw portion. The drain nut has a seat that contacts the bottom surface. A plurality of drainage grooves are formed on the surface side, and the drainage bolt, drainage nut, and drainage groove are connected to the guide groove and drainage hole to form a drainage channel. A water drainage structure for preventing stagnant water in a steel box, characterized in that there is. In the water drainage prevention structure for water leakage prevention of the steel box according to claim 5,
The water drainage structure for preventing water stagnation in a steel box, wherein the drainage bolt is inserted into a through hole from below the bottom plate, and the drainage nut is screwed on the upper side of the penetrated bottom plate. In the water drainage prevention structure of the steel box according to claim 6,
A water drainage preventing structure for preventing water stagnation in a steel box, wherein a washer is sandwiched and adhered between the bottom surface of the bottom plate and the bolt head of the drain bolt. In the water draining structure for preventing water stagnation of the steel box according to any one of claims 5 to 7,
The drainage bolt and drainage nut are each formed in a number and size so that a plurality of drainage holes, guide grooves and drainage grooves partially overlap each other. Water drain structure for water prevention.

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