JP6275772B2 - Sealing material between connecting part of bridge girder and floor slab - Google Patents

Description

  The present invention relates to a sealing material disposed along a bridge girder length direction between a bridge girder connecting portion and a floor slab in a bridge or viaduct.

  Conventionally, as shown in FIG. 10, bridge girders 51 made of H-shaped steel are arranged at a necessary interval in the width direction W and above the bridge piers 53 along the bridge axis direction L. Seal members 55, 55 separated from each other as necessary are juxtaposed along the length direction of the bridge girder 51 (same as the bridge axis direction L), and then a prestressed concrete slab (hereinafter also referred to as a floor slab) is placed on the seal member 55. A method of fixing the floor slab 57 on the bridge girder 51 by placing 57 and placing concrete or mortar 59 between the sealing materials 55 and 55 on the upper surface of the bridge girder 51 is frequently used.

The seal material 55 acts as a mold frame between the floor slab 57 and the bridge slab 51 and as a temporary support member for the floor slab 57, and until the concrete or mortar is hardened between the bridge girder 51 and the floor slab 57. And a function of sealing so that mortar does not dew (does not drip). As the sealing material 55, conventionally, a closed-cell foam made of closed-cell polyethylene foam, rubber sponge, or the like formed into a long shape having a square cross section is used.
Also, the sealing material has a two-layer structure of foam, the foam on one side is a closed-cell foam, and the foam on the other side is a foam containing more open cells than the foam on the one side. Has been proposed.

  Further, a predetermined number of the bridge girders 51 are connected in the length direction according to the length of the bridge or viaduct. As shown in FIG. 11, the connecting portion 53 of the bridge girder 51 sandwiches the upper and lower ends 511, 512 of the bridge girder 51 with an upper attachment plate 55 and a lower attachment plate 57, and the upper attachment plate 55. The lower girder plate 57 and the bridge girder 51 are fastened by fastening members 61 and 62 such as bolts and rivets penetrating vertically at a plurality of locations, and the bridge girder 51 is connected and fixed.

  However, in the connecting portion 53 of the bridge girder, the end portions of the fastening members 61 and 62 (bolt heads, nuts, rivet heads, etc.) 611 and 621 protruding on the connecting portion 53 interfere with each other so that the seal 55 material is removed. A gap between the lower surface of the sealing material 55 and the upper attachment plate 55 cannot be stably disposed on the connecting portion 53 of the bridge girder, or the lower surface of the sealing material 55 cannot follow the end shape of the fastening members 61 and 62. May cause a sealing failure, and an extra caulking agent application step may be required when placing concrete or mortar.

  Further, if the seal material 55 is not stably disposed on the upper connecting plate 55 of the bridge girder connecting portion 53, the floor slab that is used when the floor slab is lifted by a crane and placed on the seal material on the bridge girder is used. If a lateral force is applied, for example, by rubbing on the bottom surface of the floor slab during fine adjustment of the position, it easily falls to the side or shifts to the side. If the seal material falls to the side or shifts to the side, the floor slab must be released above the seal material and the seal material must be adjusted to the correct position. There is a problem that takes time.

JP 2003-155708 A JP 2003-155709 A

  The present invention has been made in view of the above points, and when the position of the floor slab is adjusted when the floor slab is placed on the sealing material, the sealing material may fall laterally or cause a displacement. It is difficult, and when placing concrete or mortar, it is possible to obtain a good sealability at the bridge girder connection, simplify the application of the caulking agent, and reduce the amount of caulking agent used. The purpose is to provide a sealing material between floor boards.

  The invention according to claim 1 is a sealing material disposed along the length direction of the bridge girder between the connecting portion of the bridge girder and the floor slab disposed above the bridge girder, the lower foam and the lower And an end of a fastening member that protrudes on the connecting portion at the placement location when the lower foam is placed on the connecting portion. A recess that accommodates a portion and a support surface that abuts the connecting portion on the lower surface, and the recess of the lower foam body is fastened in a state where the floor slab is placed on the sealing material. It is set to the depth contact | abutted with the edge part of a member, It is characterized by the above-mentioned.

  According to a second aspect of the present invention, in the first aspect, the lower foam includes a leg portion and a receiving portion provided on the leg portion so as to protrude to one side surface of the leg portion. The recess is constituted by one side surface of the receiving portion and the lower surface of the receiving portion, and the lower surface of the receiving portion comes into contact with the end portion of the fastening member in a state where the floor slab is placed on the sealing material. As described above, the height of the leg is set.

The invention of claim 3, in claim 2, wherein the lower foam comprise those wherein the receiving portion and the leg portion is composed of two members of those composed of one member integrally or separately It is characterized by that.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the upper foam has a lateral width wb orthogonal to a length direction of the bridge beam at a contact surface with the lower foam. It is smaller than lateral width wa orthogonal to the length direction of the bridge girder in the side foam.
The invention of claim 5 is characterized in that, in any one of claims 1 to 4, the upper foam has a skin layer on an outer surface.

  According to the invention of claim 1, when the sealing material is placed on the connecting portion of the bridge beam, the end portion of the fastening member protruding on the connecting portion is formed on the lower surface of the lower foam of the sealing material. Since it is accommodated in the recessed portion, the sealing material can be disposed on the connecting portion without being obstructed by the end of the fastening member, and the floor slab is placed on the sealing material In addition, the depression on the lower surface of the lower foam is supported by being in contact with the end of the fastening member, and is also supported by the support surface that is in direct contact with the connecting portion. It can be placed on the top, making it difficult for the sealing material to fall down from the side, effectively preventing the entire sealing material from falling or shifting its position, and troublesome work such as re-attaching the sealing material. Work can be eliminated, and construction work can be simplified.

  According to the invention of claim 2, the lower foam includes a leg portion and a receiving portion provided on the leg portion so as to protrude to one side surface of the leg portion, and one side surface of the leg portion. Since the recess is formed by the lower surface of the receiving portion, the recess can hold a space around the end portion of the fastening member protruding on the connecting portion. Therefore, when placing the sealing material on the connecting part of the bridge girder and placing mortar or concrete between the sealing materials, the mortar or concrete can easily enter into the depression on the lower surface of the lower foam, and it is filled without a gap. It is possible to prevent internal defects due to poor filling of mortar or concrete.

  According to the invention of claim 3, since the lower foam body is composed of one member in which the leg portion and the receiving portion are integrally formed, or two members in a separate body, the two members. Can be formed by combining square members made of a foam having a rectangular cross section, and since there is no need for a notch for a recess, there are few wasted parts, and the sealing material Cost reduction and waste reduction are possible.

According to the invention of claim 4, in the upper foam, the lateral width orthogonal to the length direction of the bridge girder in the contact surface with the lower foam is orthogonal to the length direction of the bridge girder in the receiving portion of the lower foam. Since the width is smaller than the lateral width, the bonding width with the lower foam of the upper foam is reduced, and when it is rotationally deformed by applying a lateral force, it is easily deformed in the lateral direction on the upper surface of the lower foam. . Therefore, when lateral force is applied during the position adjustment of the floor slab, etc., the upper foam is more easily deformed, and more effectively prevents the entire sealing material from falling or being displaced. It is possible to eliminate the troublesome work such as re-sticking the sealing material, and to simplify the construction work.
According to the invention of claim 5, since the upper foam has a skin layer on the outer surface, the surface is damaged even when the upper foam is rubbed on the lower surface of the floor slab when the position of the floor slab is adjusted. There is an effect that it is difficult to stick and sealability is not easily impaired.

It is a perspective view of the sealing material which concerns on one Embodiment of this invention. It is an expanded sectional view which shows the upper surface vicinity of the upper side foam in the sealing material of FIG. It is a perspective view which shows the state which has arrange | positioned the sealing material of FIG. 1 on the connection part of a bridge girder. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3. It is a perspective view which shows the state which has arrange | positioned the sealing material for non-connection parts on both sides of the connection part in FIG. It is sectional drawing which shows an effect | action when the force of a horizontal direction is added to the sealing material of one Embodiment of this invention. It is a perspective view of the sealing material which concerns on other embodiment of this invention. It is a perspective view of the sealing material which concerns on other embodiment of this invention. It is a perspective view of the sealing material which concerns on other embodiment. It is a schematic perspective view which shows a bridge girder, a sealing material, a floor slab, etc. It is a schematic perspective view which shows the connection part of a bridge girder.

  Hereinafter, embodiments of the present invention will be described. The sealing material 10 shown in FIG. 1 has a width of the bridge girder 51 along the length direction of the bridge girder 51 (same as the bridge axial direction L) on the upper joining plate 55 in the connecting portion 53 of the bridge girder 51 shown in FIG. It is arranged on both edges in the direction W.

The sealing material 10 is formed by laminating and integrating a lower foam 11 and an upper foam 21 with an adhesive, a double-sided adhesive tape, or the like.
The lower foam 11 is formed with respect to the length direction of the bridge girder 51 by a leg portion 12 and a receiving portion 16 provided on the leg portion 12 so as to protrude toward the one side surface 13 of the leg portion 12. The cross section in the vertical direction has an inverted L-shaped cross section, and a recess 18 is formed by one side surface 13 of the leg portion 12 and the lower surface 17 of the receiving portion 16. Further, in the present embodiment, the lower foam body 11 is composed of a joined body of two members, the leg portion 12 and the receiving portion 16. The two members of the leg portion 12 and the receiving portion 16 are each composed of a square-shaped foam having a rectangular cross section in the vertical direction with respect to the length direction of the bridge girder 51, and stands up and down. One end portion of the receiving portion 16 laid in a substantially horizontal direction is placed on the upper end of the leg portion 12 and joined with an adhesive or a double-sided adhesive tape. The height (a2 + a3) of the lower foam 11 is preferably 10 to 100 mm.

  The width a1 of the leg portion 12 is the width e of the portion where the end portions 611 and 621 of the fastening member are not located at both edges in the width direction W of the upper surface of the upper joint plate 55 of the connecting portion 53 shown in FIG. It is made below. The lateral width means the width in the width direction W. The distance a2 between the lower surface of the leg portion 12 and the lower surface 17 of the receiving portion 16 is set to be substantially equal to the height of the end portion 611 of the fastening member protruding from the upper attachment plate 55. On the other hand, the thickness a3 of the receiving portion 16 is set according to the hardness of the receiving portion 16, the hardness of the leg portion 12, and the like. Examples of a1, a2, and a3 include a1 = 15 mm, a2 = 20 mm, and a3 = 25 mm.

Examples of the material of the lower foam 11 include polyurethane foam, rubber sponge, polyolefin foam, and the like. Particularly preferred are polyolefin foams such as polyethylene foam.
The lower foam 11 preferably has a density (JIS K7222: 2005) of 20 to 200 kg / m ³ and a 25% compression hardness (JIS K6400-2: 2004 D method) of 30 to 350 kPa. When the density is lower than the above range, the water-stopping property is insufficient. On the other hand, when the density is high, it becomes hard and the handling property is deteriorated. Further, when the 25% compression hardness is lower than the above range, the water-stopping property is insufficient, while when it is high, the handling property is deteriorated.

  The upper foam body 21 is formed of a rod-like body having a cross section perpendicular to the longitudinal direction of the bridge girder 51 and having a square or circular cross section with rounded corners 25. The material of the upper foam 21 is preferably a foam having elasticity such as polyurethane foam. The upper foam 21 preferably has a skin layer 22 on the outer surface as shown in the enlarged sectional view of FIG. The skin layer 22 is formed into a dense film by compressing the bubbles or by reducing the bubble size, and has high smoothness and is not easily torn. Not only is the position adjustment of the floor slab 57 that sometimes rubs the upper surface of the upper foam 21 easy, but even if the floor slab 57 is rubbed, it is difficult to break. Furthermore, since the water permeability is low, the sealing performance for preventing moisture leakage of the concrete and mortar is also improved.

In addition, as a manufacturing method of the foam having a skin layer on the surface, the method described in Japanese Patent No. 3987252, that is, on the upper smooth surface of the formed paper (release paper) that is continuously fed from the cardboard roll and travels. There are a method in which a urethane raw material is continuously supplied and both ends of the molding paper are put into a square tube shape and foamed, or a molding method in which a urethane raw material is foamed in a molding die. The foam molded by the former method is preferable because it can be a long product having only one parting line (PL). Since the skin layer is cut on the PL or becomes a convex part from the periphery and the sealing performance is lowered, the upper foam PL molded by this method is brought into contact with the lower foam, It is preferable to join so as to be sandwiched between the foam and the lower foam. If it shape | molds in this way, it can be set as the sealing material which has a skin layer in the whole surface where the upper side foam which a floor slab may contact | connects.
Further, if the cross-section of the upper foam 11 is a quadrangle with rounded corners 15, the joining surface becomes smooth when joining on the lower foam, so that stable joining is easy. As mentioned above, the surface of the upper foam made of a long product with only one PL is joined to the upper surface of the lower foam with a double-sided adhesive tape, an adhesive or the like. The upper foam 11 and the lower foam 21 can be integrated by sandwiching PL inside the sealing material 10.

The upper foam 21 preferably has a density (JIS K7222: 2005) of 90 to 170 kg / m ³ and a 25% compression hardness (JIS K6400-2: 2004 D method) of 5 to 25 kPa. When the density is smaller than the above range, the water-stopping property is insufficient. On the other hand, when the density is larger, it becomes hard and the handling property is deteriorated. On the other hand, when the 25% compression hardness is smaller than the above range, the water-stopping property is insufficient, whereas when the 25% compression hardness is larger, the compression residual strain becomes large. Further, the 25% compression hardness of the upper foam 21 is smaller than the 25% compression hardness of the lower foam 11, that is, the hardness is low.

  Moreover, although the horizontal width b1 and height b2 of the said upper side foam 21 are set suitably, it is often set as b1 = 10-100 mm and b2 = 10-100 mm. Further, the width b1 of the upper foam 21 and the width a1 of the leg 12 of the lower foam 11 are preferably b1> a1 and preferably a1 / b1 = 0.3 or more. Furthermore, when the 25% compression hardness of the upper foam 21 is B and the 25% compression hardness of the lower foam 11 is A, (B × b1) <(A × a1) is preferable. By setting the value of (25% compression hardness × width) and the ratio of the width to the above relationship, the upper foam 21 is more likely to be deformed in both the vertical and horizontal directions compared to the leg 12, so that the leg 12 is relatively relative. Can be prevented from being deformed in both the vertical and horizontal directions. Thereby, the receiving part 16 can be located on the upper part of the edge parts 611 and 621 (an attachment plate fixing bolt, a rivet, etc.) of the fastening member which protrudes on a connection part, and can be made to contact them. When the floor slab is placed in the above state, the receiving portion 16 is pressed against the end portions 611 and 621 of the fastening member by the load, so that the lower foam 11 is not easily displaced in the lateral direction, and as a result. The position of the entire sealing material 10 can be made difficult to shift. Moreover, since the shape of a hollow is hard to deform | transform by being supported by both the lower surface (support surface) of the leg part 12 and the lower surface 17 of the receiving part 16, the end of the fastening member which protrudes on a connection part. The space around the portions 611 and 621 can be maintained, and cross-sectional defects can be prevented when mortar or concrete wraps around the space. In order to prevent the center of gravity of the entire sealing material from being excessively biased left and right when placed on the upper attachment plate 55 of the connecting portion 53, the lateral width b1 of the upper foam 21 is set to the lower side. It is preferable that it is equal to or smaller than the width of the foam 11.

  An example of floor slab construction (including bridge girder repair work) using the sealing material 10 will be described. When the floor slab is constructed, as shown in FIGS. 3 to 5, the sealing material 10 is a double-sided adhesive tape or adhesive provided on the lower surface (bottom surface or support surface) of the leg portion 12 in the lower foam 11. Are fixed to both edges in the width direction W of the upper surface of the upper connecting plate 55 in the connecting portion 53 of the bridge girder 51. At this time, the protruding side of the receiving portion 16 protruding from the leg portion 12 faces the center in the width direction W of the upper contact plate 55. In a state where the leg portion 12 of the lower foam 11 is fixed to the upper surface of the upper joint plate 55, the edge in the width direction W of the connecting portion 53 of the bridge girder 51 is above the upper joint plate 55. The protruding end portion 611 of the fastening member 61 is accommodated in a recess 18 between the lower surface 17 of the receiving portion 16 protruding toward the one side surface 13 of the leg portion 12 and the one side surface 13 of the leg portion 12. Thus, it comes into contact with the lower surface 17 of the receiving portion 16, and the receiving portion 16 is supported by the end portion 611 of the fastening member 61.

  Further, in the portion other than the connecting portion 53 of the bridge girder 51, the seal member 100 for the non-connecting portion is in contact with the end portion in the length direction of the seal material 10 (the same as the bridge axis direction L). It is fixed along the bridge axial direction L of the bridge girder 51 with an adhesive, etc. The non-connection portion seal member 100 has a rectangular cross section perpendicular to the length direction of the bridge girder 51 in the illustrated example. A rod-shaped upper foam 111 having a square cross-sectional shape with rounded corners perpendicular to the longitudinal direction of the bridge girder 51 is formed on the lower foam 101 in the form of double-sided pressure-sensitive adhesive tape, adhesive, etc. The lower foam 101 and the upper foam 111 of the non-connecting portion sealing material 100 are the lower foam of the sealing material 10 disposed on the upper attachment plate of the connecting portion. 11 and the upper foam 21 are made of the same material.

  Thereafter, the floor slab 57 as shown in FIG. 10 is lifted by a crane and placed on the sealing material 10 on the connecting portion 53 and the sealing material 100 for the non-connecting portion while adjusting the position on the bridge girder 51. At that time, when a lateral force F is applied to the sealing material 10 as shown in FIG. 6 due to the upper surface of the sealing material 10, that is, the upper surface of the upper foam 21 being rubbed with the lower surface of the floor slab. The upper foam 21 having a relatively low hardness is mainly deformed, and the lower foam 11 having a relatively high hardness can be prevented from being deformed. Further, the skin layer 12 formed on the outer surface of the upper foam 21 improves the slip on the upper surface of the upper foam 21, and may be performed while contacting the upper surface of the upper foam 21. Not only is the position adjustment easy, but even if the upper surface of the upper foam 21 is rubbed with a floor slab, the upper foam 21 is not easily damaged.

  Further, since the upper foam 21 has a quadrangular shape or a circular cross-sectional shape with rounded corners 25, the joint width with the lower foamed body 11 is small at the round corners 25 a and 25 b at the bottom with respect to the lateral force F. Since the supporting force is small, the upper surface of the lower foam 11 is easily deformed in the lateral direction. In addition, since the lower surface 11 of the receiving portion 16 is supported by the end portion 611 of the fastening member 61, the lower foam 11 is difficult to roll against the lateral force. . Therefore, the sealing material 10 is deformed in the lateral direction mainly at the portion of the upper foam 21 with respect to the lateral force, and the whole sealing material 10 falls from the bottom or shifts in position. Can be prevented. Therefore, troublesome work such as re-sticking work of the sealing material is not required, and the construction work can be simplified.

  Moreover, since both the said upper foam 21 and the lower foam 11 consist of a foam, the said sealing material 10 is lightweight, and the handling at the time of construction is easy. Further, since the lower foam 11 can be cut into a square cross section from the foam sheet material to form the leg 12 and the receiving part 16, the setting originally planned for repair work and the like Even when seal materials of different heights are required or when the construction period is urgently limited, it is possible to quickly form and cope.

  After placing the floor slab on the sealing material 10, concrete or mortar is filled between the sealing materials 10. At that time, concrete or mortar enters the space around the end portion 611 of the fastening member 61 in the recess 18 between the one side surface 13 of the leg portion 12 of the lower foam 11 and the lower surface 17 of the receiving portion 16. Can be filled without any gaps.

  In addition, in the said embodiment, although the leg part 12 and the receiving part 16 of the lower side foam 11 were comprised by two members, like the sealing material 10A shown in FIG. 7, the leg part 12A and lower part of the lower side foam 11A 16A may be formed integrally with a single member. In that case, the lower foam 11A is cut into an inverted L-shaped cross section by cutting off the lower corner of the square-shaped foam having a square cross section. Reference numeral 18A is a depression, 21A is an upper foam, and 25A is a rounded corner. The other configuration is the same as that of the sealing material 10 shown in FIG.

  Further, a rib 15 may be provided so as to connect between one side surface 13 of the leg portion 12 and the lower surface 17 of the receiving portion 16 as in the sealing material 10B shown in FIG. By providing the ribs 15 intermittently so as not to interfere with the end portions of the fastening members, it is possible to increase the bonding strength between the leg portions 12 and the receiving portions 16 and easily maintain the shape of the recesses 18. Furthermore, by providing the rib 15 so that the sectional view of the lower foam body 11 is rectangular in alignment with the shape of the depression 18 of the lower foam body 11, the installation bottom surface becomes larger, so that the bridge girder is placed on the connecting part. The sealing material 10B can be installed stably. If the same material as the material of the lower foam 11 is selected as the material of the rib 15, it is preferable because the supporting force and the deformation performance are equivalent. Furthermore, in order to make it easy to place the sealing material and to improve the filling property of mortar or concrete, the rib 15 is only at the longitudinal end of the sealing material 10C as in the sealing material 10C of FIG. It is preferable to be provided.

  As described above, the seal material of the present invention is difficult to cause the seal material to fall laterally or to be displaced when the position of the floor slab is adjusted when the floor slab is placed on the seal material. Troublesome work such as re-sticking materials can be eliminated, and construction work can be simplified. Further, when the mortar is placed, a good sealing property can be obtained at the connecting portion of the bridge girder, the caulking agent application work can be simplified, and the amount of the caulking agent used can be reduced. Furthermore, since concrete or mortar can be filled without a gap between the sealing materials, internal defects due to poor filling of the mortar can be prevented.

DESCRIPTION OF SYMBOLS 10 Sealing material 11 Lower side foam 12 Leg 16 Receiving part 17 Lower surface of receiving part 18 Depression 21 Upper foam 22 Skin layer 25 Round corner 25a, 25b Round corner at the bottom

Claims (5)

A sealant disposed along the length direction of the bridge girder between the connecting part of the bridge girder and the floor slab disposed above the bridge girder,
A lower foam and an upper foam laminated on the lower foam;
When the lower foam is placed on the connecting portion, a recess that accommodates an end portion of the fastening member that protrudes on the connecting portion at the placement location, and a support surface that contacts the connecting portion And on the lower surface,
The depression of the lower foam is set to a depth that contacts the end of the fastening member in a state where the floor slab is placed on the sealing material; and Sealing material between floor slabs.   The lower foam body includes a leg portion and a receiving portion provided on the leg portion so as to protrude to one side surface of the leg portion, and includes a side surface of the leg portion and a lower surface of the receiving portion. The height of the leg portion is set such that the recess is configured and the lower surface of the receiving portion comes into contact with the end portion of the fastening member in a state where the floor slab is placed on the sealing material. The sealing material between the connection part of a bridge girder of Claim 1 and a floor slab characterized by the above-mentioned. The lower foam girder according to claim 2, wherein the receiving portion and the leg portion is characterized in that it consists of being composed of two members of those composed of one member integrally or separately Sealing material between connecting part and floor slab.   The upper foam has a width that is perpendicular to the length direction of the bridge girder in a contact surface with the lower foam, and is smaller than a width that is perpendicular to the length direction of the bridge girder in the lower foam. The sealing material between the connection part of a bridge girder as described in any one of Claim 1 to 3, and a floor slab characterized by the above-mentioned.   The said upper foam has a skin layer in an outer surface, The sealing material between the connection part of a bridge girder and a floor slab as described in any one of Claim 1 to 4 characterized by the above-mentioned.

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