JP2013002175A - Connection structure of base block, and base block with the connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure that is superior in operability of construction and removal and imparts movability in three-axial directions to a connection part with respect to a base block of a boundary wall.SOLUTION: One side (projection connection end) of an end part includes a perpendicular semicylindrical projection part, shoulder faces on both sides in a width direction thereof, and a cut of a height intermediate part, and has a bolt insertion hole in a shaft center of the semicylindrical projection part above the cut and an insert nut below the cut. The other side (recessed connection end) of the end part includes a perpendicular semicylindrical recessed part, contact faces on both sides in the width direction thereof, and a hook facing the cut. While the hook is inserted into the cut, the semicylindrical projection part is inserted into the semicylindrical recessed part and a bolt inserted into the bolt insertion hole is threadably engaged with the insert nut while penetrating the hook, thereby making a connection.

Description

  The present invention relates to a concrete block (precast concrete; hereinafter referred to as “block”) used when constructing a foundation of a boundary wall such as a guardrail, a fence, or a temporary protective wall indicating a construction section. The present invention relates to a connecting structure of blocks that are connected in the longitudinal direction to construct a foundation of straight lines and curves, and a block having such a connecting structure.

  A method of constructing a guard rail installed along a road boundary with a large number of blocks connected longitudinally along the boundary is known. As a connection structure of blocks (foundation blocks) for constructing such a foundation, there are those described in Patent Documents 1 and 2. In the connection structure described in Patent Document 1, the longitudinal ends are formed in an arc shape, and the blocks having ribs having a plurality of elongated holes positioned opposite to each other are formed into the elongated holes of the mutual ribs. A bolt is penetrated, and it fastens so that a rib may be inserted from both sides with a washer and a nut through this bolt.

  On the other hand, the connecting structure described in Patent Document 2 is formed so that both opposing ends are formed in a convex arc shape, and the upper side protrudes toward the other side at one end and has a circular concave fitting recess on the lower side. Each block is connected to both ends of the block, the lower end projecting toward the other end and the lower projecting portion having a circular convex fitting projection on the upper surface. Is fitted so that the fitting convex portion and the fitting concave portion are rotatable about the fitting portion as a fulcrum, and a bolt is provided in a bolt hole provided at the center of the fitting concave portion and the fitting convex portion. Are connected through. Note that the fitting concave portion and the fitting convex portion may be provided upside down.

  The foundation block having the above-described connection structure is constructed by connecting the connection portions provided at the longitudinal end portions thereof sequentially to the connection portions of the adjacent foundation blocks to form an elongated foundation along the boundary. For example, if the foundation block is for a guard rail, the base block is provided with a round hole for standing up the guard rail column, and after the foundation is constructed, the guard rail column is installed in the round hole. .

  When constructing a permanent boundary wall, concrete or mortar is poured into a gap or recess formed at the end of connection with an adjacent foundation block to form an integral foundation. In the case of a temporary boundary wall, the position of the boundary wall is maintained by its own weight without fixing the foundation block to the ground surface. When an automobile collides with a boundary wall that is not fixed to the ground surface, such as a guard rail, the foundation block is displaced from the installation position by the impact, but both ends of the foundation block are sequentially connected to the adjacent foundation block. Therefore, the impact is received by the weight or frictional force of the plurality of base blocks, and the guard rail does not fall down or move greatly.

JP 2002-309594 A JP 2005-179949 A

  In the connection structure described in Patent Document 1, since the ends of adjacent blocks are firmly fastened by a plurality of bolts, it is possible to construct a strong foundation with high strength and rigidity of the connection part. Is cumbersome and time consuming. Further, as a drawback due to the high strength and rigidity, the impact when the automobile collides is large and the damage to the automobile is large. Also, once installed, the work for shifting or removing the installation position is troublesome.

  On the other hand, according to the connection structure described in Patent Document 2, since the adjacent base blocks can freely set the angle around the vertical axis in the connection portion, the boundary wall is formed along the boundary corner or the winding boundary. Easy to build. However, the ends of adjacent base blocks are in contact with the upper surface of the lower protrusion formed on one end and the lower surface of the upper protrusion formed on the other end, and formed on these surfaces. Since the circular concave and convex portions are connected by fitting, it is difficult to cope with the twist of the ground surface to be installed and the change in the vertical inclination.

  The present invention was made to solve the problems of the conventional connecting structure as described above, and is excellent in workability when constructing and removing the boundary wall, and the vertical axis in the connecting portion with the adjacent base block. It is possible to give appropriate mobility in the direction of rotation, horizontal axis and torsion, and the amount of concrete and mortar required when integrating the foundation by filling the connecting part with concrete or mortar can be reduced The problem is to obtain the basic block connection structure.

  The basic block connecting structure of the present invention is a structure for connecting the longitudinal ends of elongated concrete blocks having a substantially rectangular cross section, and one of the ends to be connected is in the middle of the block in the width direction. A vertical semi-cylindrical convex portion is provided, and the other block is provided with a vertical semi-cylindrical concave portion. Hereinafter, the end provided with the semicylindrical convex portion 21 is referred to as a convex connecting end, and the end provided with the semicylindrical concave portion 31 is referred to as a concave connecting end.

  The semi-cylindrical convex portion 21 of the convex coupling end 2 is formed at a position slightly deviated from the center in the width direction or the center of the longitudinal end portion of the block 1 (1, 11, 12). A surface 22 is formed. The apex angle of the semicircle of the semicylindrical convex part 21 shall be an angle exceeding 180 degrees. In the height intermediate portion of the semicylindrical convex portion 21 formed in this way, a notch 24 cut from the end portion of the block at a depth exceeding the axis of the semiconvex cylinder is provided. The cut 24 is preferably a trapezoid or a trapezoid whose shape is viewed from the side of the block.

  Depending on the vertical dimension of this notch or the inclination angle of the hypotenuse when it is trapezoidal, the permissible rotation angle around the horizontal axis of the connected blocks (around the horizontal axis in the block width direction), that is, between adjacent blocks It is possible to set an angle that can respond to a change in vertical inclination.

  A bolt insertion hole 27 penetrates the shaft center of the semicylindrical convex portion 21 above the notch 24 in the vertical direction. An insert nut 28 that opens upward is embedded in the axial center of the semi-cylindrical convex portion below the notch 24. A counterbore hole 29 is provided at the upper end of the bolt insertion hole 27, and a bolt inserted from the upper end of the bolt insertion hole 27 can be screwed to the insert nut 28.

  The semi-cylindrical concave portion 31 of the concave coupling end 3 has a radius larger than the radius of the semi-cylindrical convex portion 21, and the apex angle of the semi-concave circle is 180 smaller than the apex angle of the semi-convex circle of the semi-cylindrical convex portion. About degrees. The semi-cylindrical recess 31 is provided at the center in the width direction or at a position slightly deviated from the center of the end of the block, and contact surfaces 32 are formed on both sides in the width direction. The allowable amount of the rotation angle around the vertical axis between the connected blocks is set by the difference between the apex angle of the semi-convex circle of the semi-cylindrical convex portion 21 and the apex angle of the semi-concave circle of the semi-cylindrical concave portion 31. .

  A U-shaped hook 34 extending toward the axial center of the concave cylinder protrudes at a position facing the notch 24 of the semicylindrical concave part 31 with its base end embedded in the block. This hook is formed of rust-proof round steel, and is provided so that the arc of the bottom of the U-shape coincides with the axis of the semi-cylindrical recess.

  The convex connecting end 2 and the concave connecting end 3 are formed by inserting the semi-cylindrical convex portion 21 into the semi-cylindrical concave portion 31 with the hook 34 inserted into the notch 24, and the bolt inserted from above into the bolt insertion hole 27. It is connected by passing through the U-shape and screwing into the insert nut 28.

  The semi-cylindrical convex portion 21 and the semi-cylindrical concave portion 31 are limited in the degree of freedom of rotation about the vertical axis due to the difference in apex angle, and are limited in the degree of freedom in vertical tilting and twisting due to the difference in radius. Has been. Therefore, adjacent blocks within this allowable limit can cope with the bending of the boundary, the torsion of the ground surface, and the difference in vertical inclination, and when an impact is applied to one of the basic blocks due to a car collision or the like, After the block is displaced, the impact is received in stages in the process in which the impact is sequentially transmitted to the adjacent blocks, so that the impact applied to the colliding automobile, the guard rail installed on the foundation block, or the like is alleviated.

  The basic block of the present invention is a basic block provided with a convex connecting end 2 at one of the longitudinal ends and a concave connecting end 3 at the other end. The basic block provided at the end of the boundary wall is a block in which only one of the longitudinal ends thereof is the convex connection end 2 or the concave connection end 3. In the connection end of the foundation block of the present invention, since the angle around the vertical axis at the connection end is regulated, the foundation of the corner portion of the boundary is constructed by the refracted foundation block. The refraction angle of the foundation block provided at the corner is prepared in a plurality of angles such as 90 degrees and 135 degrees, and the intermediate angle between the refracted foundation block and the connecting section of the straight foundation block connected to the foundation block. This can be dealt with by adjusting the angle around the vertical axis.

  According to the connecting structure of the present invention, the convex connecting end 2 and the concave connecting end 3 of the adjacent base blocks are brought into contact with each other by screwing the bolt 6 inserted from above into the insert nut 28. As with the connection structure described in Document 2, the block connection operation is easy.

  In addition, the connecting structure of the basic block according to the present invention provides a degree of freedom within the range set with respect to the angle around the vertical axis, the horizontal axis and the torsional direction, so that the ground surface to be installed is twisted or inclined. In addition to being able to cope with the change of the block as appropriate, the effect of transmitting the impact to the adjacent block while absorbing the impact by the displacement of the block within the allowable range is exhibited, and the foundation block is not fixed to the ground surface. When installed, the effect of reducing the damage by reducing the impact on the fence of the guardrail can be exhibited.

Plan view showing an example of basic shape block Side view The top view which showed the connection state of a convex connection end and a concave connection end Same sectional side view Plan view showing rotation around the connecting bolt Plan view of foundation blocks connected along a bent boundary Cross-sectional front view of the connecting portion showing rotation in the torsional direction Cross-sectional side view of connecting part showing rotation around horizontal axis The top view which shows the 1st example of the basic block provided in an edge part Plan view showing the second example The top view which shows the 1st example of the basic block provided in the corner | angular part of a boundary Plan view showing the second example The top view which shows the connection state of the block provided in a corner | angular part, and a linear block

  Hereinafter, with reference to the drawings, embodiments of the basic block of the present invention and its connecting structure will be described.

  FIGS. 1 and 2 are a plan view and a side view showing an example of the basic shape of the foundation block, which is an example of the foundation block installed on a straight and arc-shaped boundary line. The basic block 1 is a block having a width of 400 to 600 mm, a height of 450 to 650 mm, and a length of about 1000 to 2000 mm. One longitudinal end of the block 1 is a convex connection end 2, and the other end is a concave connection end 3. The block is provided with a hole 4 for erecting the column at a position corresponding to the length of the block and the column interval of the guard rail to be installed. In addition, the lower surface of the block is provided with a recess 5 penetrating in the width direction of the block for preventing rainwater and the like from being blocked by the block when installed on the ground surface.

  The convex connecting end 2 includes a vertical semi-cylindrical convex portion 21 at the center in the width direction of the block, and shoulder surfaces 22 provided on both sides in the width direction. The shoulder surface 22 is a flat surface formed on both sides of the semicylindrical convex portion 21 in the width direction, and is an inclined flat surface in a direction in which the semicylindrical convex portion 21 side slightly protrudes in the longitudinal direction. In the illustrated example, the peripheral surface of the semicylindrical convex portion 21 is connected to the shoulder surface 22 via a skirt surface 23 formed of a short plane.

  A notch 24 is provided at a height intermediate portion of the semi-cylindrical convex portion 21. In this cut, the lower surface 25 is a horizontal plane parallel to the upper and lower surfaces of the block, the ceiling surface 26 is an inclined surface whose height increases toward the tip of the semicylindrical convex portion, and the axis of the semicylindrical convex portion 21 is formed. And a depth at which the shoulder surface 22 is not cut. Therefore, the semi-cylindrical convex portion 21 is divided into an upper portion 21 a and a lower portion 21 b by the notch 24. The upper semi-cylindrical convex portion 21a is provided with a bolt insertion hole 27 in the axial center, and an insert nut 28 having an upper screw hole is embedded in the axial center of the lower semi-cylindrical convex portion 21b. Yes. A counterbore hole 29 for hiding the head of the bolt to be inserted is provided at the upper end of the bolt insertion hole 27.

  The concave coupling end 3 includes a vertical cylindrical semi-cylindrical recess 31 provided in the center of the block in the width direction, and a contact surface 32 connected to the peripheral surface of the semi-cylindrical recess 31 on both sides of the block in the width direction. The radius R of the semi-cylindrical recess 31 is slightly larger than the radius r of the semi-cylindrical protrusion 21. For example, the radius of the semi-cylindrical recess is 125 with respect to the radius 110 of the semi-cylindrical protrusion.

  A thin U-shaped hook 34 extending from the bottom portion of the concave portion 31 to the axial center of the concave portion in the longitudinal direction of the block is provided at the height intermediate portion of the semicylindrical concave portion 31. This hook is a steel bar whose base end is embedded and integrated in the block 1, and is provided so that the center of the bent circle at the tip thereof coincides with the axis of the semi-cylindrical recess 31.

  3 and 4 are a plan view and a cross-sectional side view showing a connection state between the convex connection end 2 and the concave connection end 3 of the above structure. The convex connecting end 2 of one base block 1a and the concave connecting end 3 of the adjacent base block 1b are provided with a concave connecting end hook 34 as a convex connecting end notch 24, and a bending center at the tip thereof is a semi-cylindrical convex shape. The connection bolt 6 is inserted into the bolt insertion hole 27 while being inserted until it coincides with the axial center of the portion 21, and the end of the bolt penetrating the hook 34 is screwed to the insert nut 28.

  In this connected state, as shown in FIG. 5, the adjacent blocks 1a and 1b can rotate around the connecting bolt 6 within a range until the shoulder surface 22 and the contact surface 32 come into contact with each other. As shown in FIG. 6, the basic blocks can be connected and arranged along the bent boundary line. The allowable rotation angle can be set by the positional relationship between the semicylindrical convex portion 21 and the shoulder surface 22 and the semicylindrical concave portion 31 and the contact surface 32.

  In addition, as shown in FIG. 7, the foundation blocks 1a and 1b can rotate in the twisting direction within a range until the side surface of the semicylindrical convex portion 21 and the side surface of the semicylindrical concave portion abut on the upper and lower ends thereof. It is acceptable and can cope with torsion of the ground surface. This allowable amount of rotation can be set by a dimensional difference between the radius r of the semicylindrical convex portion 21 and the radius R of the semicylindrical concave portion 31.

  Further, as shown in FIG. 8, the adjacent blocks 1 a and 1 b are arranged such that the upper end of the semicylindrical convex portion 21 and the upper end of the peripheral surface of the semicylindrical concave portion 31 in a state where the tip of the hook 34 is locked by the bolt 6. Can be rotated about the horizontal axis in the width direction of the block in a range until the lower ends thereof contact each other, and it is possible to cope with the vertical inclination of the ground surface. The allowable amount of rotation can be set by the difference in radius between the semicylindrical convex portion 21 and the semicylindrical concave portion 31 as in the case of twisting.

  Further, the adjacent base blocks 1a and 1b can be displaced in the height direction within the range in which the hook 34 can move up and down in the height direction within the cut 24, and can correspond to slight unevenness of the ground surface. it can.

  Since such rotation and displacement between the connected blocks are slightly allowed, an impact applied to a certain block due to a car collision or the like is gradually displaced to the adjacent block after the block is slightly displaced. The impact will be mitigated and the damage and damage from such a collision can be reduced.

  FIGS. 9 and 10 are examples of the basic block provided at the end of the guardrail, in which the convex connecting end 2 or the concave connecting end 3 is formed at one longitudinal end, and the other end is an end having no connecting end. . In such a basic block at the end, a hole 4 for erected a column is necessarily provided.

  11 and 12 are diagrams showing examples of foundation blocks provided at the corners of the boundary. FIG. 11 is a foundation block 11 provided at the corner of 90 degrees, and FIG. 12 is a foundation provided at the corner of 135 degrees. 5 is a plan view showing an example of a block 12. FIG. These blocks 11 and 12 are different from the linear block 1 shown in FIGS. 1 and 2 only in that the longitudinal intermediate portion is bent at 90 degrees to 135 degrees, and the convex connecting ends 2 at both longitudinal ends thereof. And the structure of the concave connection end 3 is the same as the structure demonstrated in FIG.

  As shown in FIG. 13, these blocks 11 and 12 are connected to the linear block 1 in the above-described structure in order, thereby providing a basis for a boundary wall provided along a linear or curved boundary including corners. Form.

  In addition, although the said Example demonstrated what provided the hole 4 which erects the support | pillar of a guardrail, if it was used as the foundation of a fence etc. of another structure, the insert nut for fixing such a fence It is possible to adopt a structure according to the structure of the boundary wall to be constructed, such as a structure in which the upper wall is provided on the upper surface, or a block in which a low concrete boundary wall is provided integrally.

1 (11,12) Block 2 Convex end 3 Concave end
21 Semi-cylindrical convex part
22 Shoulder
24 depth of cut
27 Bolt insertion hole
28 Insert nut
29 counterbore
32 Contact surface
24 hook
31 Semi-cylindrical recess 31

Claims (4)

Construct a foundation for forming a guardrail or other boundary wall along the boundary of the ground surface by providing a connecting portion at the end in the longitudinal direction and sequentially connecting the connecting portion to an opposing connecting portion of an adjacent block. A connection structure of a connection type basic block,
One of the connecting portions provided at the longitudinally opposed ends of adjacent blocks is
A semi-cylindrical convex part with a vertical axis, shoulder surfaces located on both sides of the semi-cylindrical convex part, and a depth exceeding the semi-cylindrical axis at the height intermediate part of the semi-cylindrical convex part. A convex coupling end provided with a horizontal cut cut from a block end, a bolt insertion hole provided in the shaft above the cut, and an insert nut provided in the shaft below the cut. And
The other of the connecting portions is
A semi-cylindrical recess having a vertical axis, a contact surface composed of a vertical plane located on both sides of the semi-cylindrical recess, and a U projecting in the longitudinal direction of the block at a height inserted into the notch A concave connecting end with a hook,
By inserting the U-shaped hook of the block adjacent to the notch and inserting the bolt inserted through the bolt insertion hole through the U-shape of the hook and screwing into the insert nut, the convex connecting end and the concave connecting end The connection structure of the basic block where and are connected.   The shoulder surface and the contact surface are formed such that the vertical plane of the shoulder surface and the contact surface are separated from each other when the longitudinal direction of the connected block is the same direction. The connection structure according to claim 1, wherein adjacent blocks are connected to each other so as to be rotatable around the connection bolt within a range until the contact surface comes into contact.   The semi-cylindrical protrusions at the connecting portions of adjacent blocks when the inner ends of the U-shaped hooks and the connecting bolts inserted through the U-shaped are brought into contact with each other with the longitudinal direction of the connected blocks in the same direction The semi-cylindrical convex part and the semi-cylindrical concave part are formed so that the peripheral surface of the part and the peripheral surface of the semi-cylindrical concave part are separated, and the upper and lower ends of the semi-cylindrical convex part and the semi-cylindrical concave part are in contact with each other. The connection structure according to claim 1 or 2, wherein adjacent blocks within the range are connected to each other so as to be rotatable about an axis in the longitudinal direction and an axis in the width direction.   The base block which is provided with the convex connection end at one end in the longitudinal direction and is provided with the concave connection end at the other end and which are adjacent to each other in the longitudinal direction and are connected by the connection structure according to claim 1, 2 or 3. .

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