JP6587471B2 - Precast concrete wall railing installation structure and installation method - Google Patents

Description

  The present invention relates to an installation structure and installation method for a precast concrete wall rail provided along a side edge of a concrete floor slab such as a road.

  Concrete wall height rails are provided along the side edges of road bridges, elevated roads, elevated tracks, etc., to prevent the vehicle from moving away from the driving lane or route, or from collision impacts. To improve safety and impact resistance.

  The above-mentioned concrete wall rails are often installed at high positions such as overpasses, and repair and replacement work when they are aging requires a lot of labor and time for installation and curing of scaffolds, etc. In other words, there is a risk that work at a high position or work while traffic restrictions are required. Therefore, there is a demand for durability that the concrete wall rail once constructed and installed can be used for a long time.

  One of the major causes of the above-mentioned deterioration is the joint between a horizontal member such as a floor slab and a wall rail that rises from it, or a small wall raised from the side edge of the floor slab and a wall installed above it Water enters from the joints and cutouts, etc. provided for connecting and fixing the railing to the railing and the wall railing to the floor slab, etc. Corrosion of reinforcing bars for connecting metal fittings and concrete reinforcement means and lack of durability.

  As shown in Patent Document 1, there is a technology in which a precast concrete wall rail A manufactured in advance in a factory or the like is installed on a side edge of a concrete floor slab B. The wall rail A is a concrete floor slab B and It is attached by connecting means such as anchor bolt C or non-shrinkable mortar D.

  In order to attach the wall rail A to the concrete floor slab B, a concave notch E serving as a space for fixing anchor bolts C is formed in the wall rail A in advance, and the concrete floor slab B and the wall The end of the anchor bolt C connected to the rail A is fixed at the notch E, and the wall rail A is continuously installed along the side edge of the concrete floor slab B.

  Further, as shown in Patent Document 2, a PC steel rod penetrating sheath H penetrating in the vertical direction is provided in the inside of the block F serving as the wall rail and in the side edge portion of the floor slab G, and the PC steel is provided in the sheath H. The block F which becomes a wall rail by inserting the bar J, penetrating the PC steel bar J from the upper end of the block F to the bottom side of the floor slab G, and fixing with the anchor plate K and the nut L at the upper and lower ends. There is technology that has installed.

  In the mounting structure of the wall rail A of the above-mentioned Patent Document 1, a joint portion serving as a joining means between the wall rail A and the concrete floor slab B, and a notch E for anchor bolt fixing provided on the wall rail. The water intruded from the seawater, which was a major cause of corrosion deterioration of anchor bolts and reinforcing bars.

  Moreover, in the connection method of the block F and floor slab G used as the wall height column of the said patent document 2, the connection part M of the block F and the floor slab G is the same level as the pavement lower surface in the floor slab G. The water from the pavement enters the connecting part M. In addition, water also enters the square hole P that becomes a notch for fixing the anchor plate K and the nut L of the PC steel rod J formed on the top of the sheath H for penetrating the PC steel rod. This intrusion water was a major factor causing corrosion deterioration of the reinforcing bars used for the PC steel bar J, the block F and the floor slab G.

Japanese Patent Laying-Open No. 2015-71907 JP-A-7-102528

  The present invention solves the above disadvantages, and prevents rainwater, snowmelt water, cleaning water, and the like from notches and joints from entering the main body, and a wall provided near the coast. It is intended to improve the durability of the precast concrete wall rail by preventing the exposure of anchor bolts, reinforcing bars, etc., which cause salt damage in the rail.

  The present invention provides a rising leg integrally with the floor slab at a side edge of the floor slab up to a position higher than the pavement surface on the floor slab. In the installation structure in which a joint portion formed with a convex surface in the height direction is provided at the center, and a precast concrete wall rail is placed on the top end surface via a connecting material, the floor slab, the rising leg And an installation structure of the precast concrete wall rail, in which the upper one end of the anchor bolt is fixed in the precast concrete wall rail by means of an anchor bolt passing through the convex surface of the precast concrete wall rail. To do.

  Moreover, the installation structure of the precast concrete wall rail which made the said anchor bolt the Al-Mg spraying high strength bolt is characterized.

  Further, a rising leg is provided integrally with the floor slab at a side edge of the floor slab up to a position higher than the pavement surface on the floor slab, Place the precast concrete wall rail through the connecting material so that the concave surface on the lower surface is fitted and fixed to the convex surface of the wall, and embed it in the wall of the precast concrete wall so that the lower end is exposed An installation method of a precast concrete wall rail is formed by inserting an anchor bolt passing through the convex surface from the bottom of the floor slab into the embedded insert and fixing the floor slab and the precast concrete wall rail. And

  Further, the present invention is characterized by a method for installing a precast concrete wall rail using the anchor bolt as an Al-Mg sprayed high strength bolt.

  The installation structure and installation method of the precast concrete wall rail of the present invention is such that water that jumps up from the pavement surface or water that is struck against the wall surface or flows down through the wall surface is joined to the floor slab and the precast concrete wall rail. Since there is no intrusion beyond the protruding position of the convex surface, the water does not touch the anchor bolts that are the connecting means passing through the convex surface, and the reinforcing bar in the main body has water from that position. Can be prevented from being corroded by water without contact.

  In addition, by using Al-Mg sprayed high strength bolts for the anchor bolts, strength and durability can be obtained, and contact corrosion from dissimilar metals can be prevented, and repair of precast concrete wall rails can be performed. It has become possible to maintain a predetermined strength in a state that does not need to be applied over a long period of time.

(A) Top view of precast concrete wall rail of the present invention, (b) Front sectional view of the same. (A) AA line sectional view of Drawing 1 (b), (b) BB line sectional view of the Drawing 1 (b). Table of performance of Al-Mg sprayed bolts. Sectional drawing which shows the water penetration | invasion path | route in the connection part of the precast concrete wall rail of this invention. Sectional drawing of the prior art example of the wall rail made from precast concrete. Sectional drawing of the other conventional example of a concrete wall rail.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Fig.1 (a) is a top view of the installation structure of the precast concrete wall rail of this invention, (b) has shown the center sectional drawing of the longitudinal direction. 2A and 2B show an AA sectional view and a BB sectional view in FIG.

  The wall wall 1 made of precast concrete is fixed to the surface side of the side edge of the floor slab 2 on a raised leg 3 having a width that is formed integrally with the floor slab 2 in a block shape.

  The rising leg 3 is formed with a vertical wall surface 4 on the inner side which is a road side, and an inclined wall surface 5 which is continuously inclined to the vertical wall surface 4, and the outer side projects downward from the bottom surface 6 of the floor slab 2. The rear side vertical wall surface 9 is formed up to the top end surface 8 with the protruding portion 7 of the edge portion as one end.

  As shown in FIG. 4, the top end surface 8 of the rising leg 3 is a convex surface 10 whose central portion is raised upward, and is flat at a position lower than the convex surface 10 on the left and right sides of the convex surface 10. Surfaces 11 and 12 are formed, and tapered left and right inclined surfaces 13 and 14 are formed from the flat surfaces 11 and 12 toward the convex surface 10.

  As shown in FIG. 2B, the rising leg 3 is provided with a through hole 15 extending from the bottom surface 6 of the floor slab 2 to the rising convex surface 10. The through holes 15 are provided at appropriate intervals over the longitudinal direction of the rising legs 3. For example, it is provided every 500 mm.

  A precast concrete wall height column 1 is placed and fixed on the top end face 8 of the rising leg 3. The precast concrete wall rail 1 has an inclined wall surface 16 on the front surface and a vertical wall surface 17 on the back surface, and the lower end portion is inwardly centered so as to be fitted with the top end surface 8 of the rising leg 3. A recessed surface 18 serving as a recessed groove is formed, and left and right flat surfaces 19 and 20 projecting downward to the left and right across the groove are formed. The left and right flat surfaces 19 and 20 form left and right inclined surfaces 21 and 22 that fit into the tapered left and right inclined surfaces 13 and 14, respectively.

  The embedded insert 23 is attached from the position of the recessed surface 18 of the wall wall 1 made of precast concrete toward the inside of the main body, and the end side thereof is exposed to the recessed surface 18 and fixed in the concrete. It is fixed with an embedded anchor plate 24 in the concrete to prevent it from coming off.

  The through hole 15 and the embedded insert 23 are provided so that their positions coincide with each other in a state where the precast concrete wall rail 1 is placed and fixed on the rising leg 3.

  A connecting material is used for the joint portion of the top end surface 8 of the rising leg 3, but a thin joint portion can be formed by applying an adhesive such as resin mortar. It can also be filled when the precast concrete wall rail 1 is placed or after it is placed. The connecting material may be an inorganic material such as non-shrink mortar.

  After placing the precast concrete wall rail 1, the anchor bolt 25 is inserted from the through hole 15 exposed on the bottom surface 6 of the floor slab 2 toward the embedded insert 23. The inserted anchor bolt 25 is screwed into the embedded insert 23 at the insertion tip side. By providing the space 26 on the end portion side of the embedded insert 23 up to the end portion, the anchor bolt 25 can be easily inserted into the embedded insert 23. The head of the anchor bolt 25 is exposed at the bottom of the floor slab 2, and the head of the anchor bolt 25 is inserted into the through-hole 15 by interposing a bolt anchor plate 27. Can be stopped.

  The anchor bolt 25 is optimally a sprayed bolt manufactured by an Al-Mg spraying method. Conventionally, galvanized high-strength bolts have been used, but there is concern about the contact corrosion of dissimilar metals between the plating material and zinc, and the use of Al-Mg sprayed high-strength bolts has eliminated that concern. As shown in FIG. 3, the repainting frequency by the Al-Mg sprayed high strength bolt is 100 years or more.

  As shown in FIGS. 1 and 2, the precast concrete wall rail 1 in the longitudinal direction is concavo-convexly fitted 28 and firmly fixed by inserting and pulling the PC steel material into the PC steel material arrangement hole 29. .

  A pavement 30 is applied on the floor slab 2, but since the rising legs 3 are integrally formed upright, the top end face 8 serving as a joint at a position higher than the surface of the pavement 30. As shown in FIG. 4, the water on the surface of the pavement 30 penetrates between the vertical wall surface 4, the inclined wall surface 5, and the right flat surfaces 12 and 20 and protrudes between the right inclined surfaces 14 and 22. The water does not reach the position of the fitting portion between the part surface 10 and the concave surface 18, and water that flows from the inclined wall surface 16 side of the precast concrete wall rail 1 penetrates between the right inclined surfaces 14, 22 to form the convex surface 10 and the position of the fitting portion between the concave surface 18 are not reached. Further, the water on the back side of the precast concrete wall rail 1 passes from the left flat surfaces 11 and 19 between the vertical wall surface 17 and the back side vertical wall surface 9 of the rising leg 3 of the floor slab 2 to the convex surface 10. It does not reach the position of the fitting portion of the concave surface 18. As a result, the through hole 15, the anchor bolt 25, and the reinforcing bars and the like are not in contact with water through them.

DESCRIPTION OF SYMBOLS 1 Precast concrete wall rail 2 Floor slab 3 Standing leg part 4 Vertical wall surface 5 Inclined wall surface 6 Bottom surface 7 Protrusion part 8 Top end surface 9 Back side vertical wall surface 10 Convex surface 11 Left flat surface 12 Right flat surface 13 Through-hole 14 Precast Concrete wall rail 15 Through-hole 16 Inclined wall surface 17 Vertical wall surface 18 Recessed surface 19 Left flat surface 20 Right flat surface 21 Left inclined surface 22 Right inclined surface 23 Embedded insert 24 Anchor plate 25 Anchor bolt 26 Space 27 Bolt anchor plate 28 Concavity and convexity fitting 29 PC steel material arrangement hole 30 Pavement material

Claims (4)

A rising leg is provided integrally with the floor slab at a side edge of the floor slab up to a position higher than the pavement surface on the floor slab. In the installation structure in which a precast concrete wall rail is placed on the top end surface with a connecting material on the top end surface, and in the precast concrete wall rail so that the lower end is exposed An anchor bolt passing through the convex surface from the lower part of the floor slab is inserted into the embedded insert embedded in the floor slab, passing through the convex surface through the floor slab, the rising leg, and the precast concrete wall rail. A precast concrete wall rail installation structure characterized in that an upper one end of the anchor bolt is attached in the precast concrete wall rail with an anchor bolt.   2. The precast concrete wall rail installation structure according to claim 1, wherein the anchor bolt is an Al-Mg sprayed high strength bolt. A rising leg is provided integrally with the floor slab at a side edge of the floor slab up to a position higher than the pavement surface on the floor slab. Place the precast concrete wall rail through the connecting material so that the concave surface provided on the lower surface is fitted and fixed to the part surface, embedded in the precast concrete wall rail so that the lower end is exposed the insert, and insert the anchor bolts passing through the convex portion surface from the bottom of the bed plate, floor plate and installation method of the precast concrete wall railings, characterized in that fixed and said precast concrete wall railing . 4. The method for installing a precast concrete wall rail according to claim 3, wherein the anchor bolt is an Al-Mg sprayed high strength bolt.

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