JPH0626581Y2 - PC block for slope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sloped PC block, and in particular for constructing a sloped frame to prevent collapse by fixing a number of precast concrete block bodies on the sloped surface with anchors. Related to the slope PC block.

[Prior Art] As shown in FIG. 11, a conventional PC block 1 for slopes has a cross-shaped precast concrete block body 4 having arms 2 on four sides and an anchor insertion hole 3 in the center. The pre-stressed concrete block main body 4 is provided with vertical and horizontal arms 2 provided with pre-stressed PC steel materials 5 and 5A in a perpendicular direction by a so-called post-tensioning method of introducing pre-stress after solidification of concrete. In this case, the method frame 7 is constructed by arranging the PC blocks 1 for slopes so that the end faces of the four-sided arms 2 face each other and are arranged in a grid pattern on the slopes and fixed by the PC anchor 6.

[Problems to be Solved by the Invention] In the above conventional technology, the sloped PC block 1 has a cross shape having arms 2 on four sides, and the PC steel materials 5 and 5A extend vertically along the four arms 2. Since the prestress is introduced by the post tension method which is provided transversely orthogonally, it is not possible to place a plurality of block main bodies 4 side by side in the manufacturing process and collectively introduce the prestress. Since stress has to be introduced, it is not suitable for mass production and has a problem of high cost.

Further, in the prior art, since the slope PC block 1 has a cross shape, there is a problem that it cannot cope with the uneven surface of the slope. In other words, if there are many irregularities on the slope, cross-shaped P
It was difficult to stably attach all four arms 2 of the C block 1 to the slope, and a large gap between the slope and the arm 2 was likely to occur, resulting in instability. Therefore, a lot of work period and cost are required for the work of shaping the slope uniformly in advance and performing the backfilling process.

It is therefore an object of the present invention to provide a sloped PC block that can introduce prestressing into a plurality of block bodies at once and that can easily cope with uneven surfaces.

[Means for Solving the Problems] The present invention relates to a sloped PC block in which a large number of precast concrete block main bodies are fixed to a slope to construct a slope, in which the precast concrete block main body is fixed to the slope. A pair of arms is formed in a straight line on two sides of the fixing portion, and a PC wire rod in which prestress is introduced by a pretension method is provided in the longitudinal direction of the precast concrete block body.

[Operation] With the above-mentioned configuration, the sloped PC block of the present invention can introduce prestressing collectively by a pretensioning method by arranging a plurality of block bodies in the same direction. Further, the PC block for slopes need only have two arms attached to the slopes, and it is easy to deal with the uneven surface of the slopes.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a sloped PC block 11, which is a lengthwise direction of an I type precast concrete block body 13 in which a pair of arms 12 and 12 are formed in a straight line on two sides of a fixing section 15. In the direction, a plurality of PC steel materials 14 that are prestressed by a so-called pretensioning method in which prestressing is introduced before solidification of concrete are provided. Further, the fixing portion 15 is formed thick in the center of the block body 13, an anchor insertion hole 16 is formed in the center of the fixing portion 15, and a recess 17 is formed in the central upper portion. Further, a pair of chevron-shaped projecting portions 18 are provided on both sides of the fixing portion 15 so as to project laterally to form a planar octagonal shape. Further, the top end surface of each overhanging portion 18 forms a connecting surface 19 of the end surfaces of the arms 12 of the adjacent PC blocks 11. A taper surface 20 is formed around the fixing portion 15, and a rib 21 is formed on the upper portion of the arm 12 in the longitudinal direction.

FIG. 4 shows a state in which a large number of slope block PC blocks 11 are fixed on the slope face and a slope frame 22 is installed, and each arm end face 12A of the slope face PC blocks 11 adjacent to each other is extended. A large number of them are fixed in a state of being arranged so as to face the connecting surface 19 which is the end surface on the side of the top of the portion 18 to form a lattice-shaped law frame 22.

FIGS. 5 and 6 show an example of a joint joint structure for connecting adjacent sloped PC blocks 11 to each other. As shown in FIG. 5, a pair of anchors is provided at each of the overhanging portion 18 end and the arm 12 end. The plate 23 is embedded, and the protruding portion 23 of each anchor plate 23
A is connected by a connecting member 24 such as a bolt and a nut, and the arm end surface 12A and the connecting surface 19 are fixed by mortar.

FIG. 7 shows an example of a structure for fixing the slope PC block 11 to the slope. An anchor hole drilled in the ground of the slope.
PC anchor 27 is fixed by concrete 26 in 25,
The tip of the PC anchor 27 is inserted into the anchor insertion hole 16 in the center of the PC block 11 to fix the PC through the anchor head 28.

As described above, in the above embodiment, the precast concrete block body 13 has the pair of arms 12, 12 formed in a straight line on two sides of the fixing portion 15 fixed on the slope, and the pretensioning method is applied only in the longitudinal direction. Since the pre-stressed PC steel material 14 is provided in the manufacturing process, a plurality of precast concrete block body forms 29 are arranged in a line in the manufacturing process as shown in FIG. A prestressing device 30 is provided and a fastening device 31 is provided on the other side, and prestressing is collectively introduced into a plurality of PC steel materials 14 arranged between the devices 30 and 31,
By pouring concrete into the plurality of molds 29 in this state, a plurality of PC blocks 11 can be manufactured at the same time, and mass productivity can be improved.

Further, in the above-mentioned embodiment, since the slope PC block 11 is formed into an I shape by the bidirectional arms 12, it is sufficient to attach the bidirectional arms 12 to the uneven surface as in the conventional case. Compared to the one with arms on all sides, it is easier to deal with the uneven surface of the slope, which reduces the gap between the arm 12 and the slope, reducing the time required for uniform shaping of the slope and backfilling. Become.

Further, in the above-described embodiment, the overhanging portions 18 are provided on both sides of the center of the slope PC block 11, and the arm 12 of the slope PC block 11 adjacent to the overhanging portion 18 is connected. Since the holes 32 for each of the lattice-shaped frame 22 are smaller than those using the cross-shaped PC block, the collapse prevention effect is enhanced and the ninth
Triangular overhang 18A is formed as shown, and this overhang 18A
By using the hypotenuse as the connecting surface 19A, the direction of the adjacent PC block 11 can be changed as compared with that of FIG. 4, and as shown in FIG. Department
The connecting direction of the PC block 11 can be selected by arbitrarily forming 18B and the connecting surface 19B.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the number or material of the PC wire may be appropriately selected, and the protruding portion may be formed by a curved portion or the like.

[Effects of the Invention] The present invention provides a sloped PC block in which a large number of precast concrete block bodies are fixed to a slope to construct a slope frame. The precast concrete block body is a fixing part that is fixed to the slope. On the other hand, a pair of arms are formed in a straight line, and a PC wire rod in which prestress is introduced by a pretension method is provided in the longitudinal direction of the precast concrete block body, and prestress is collectively applied to a plurality of block bodies. It is possible to provide a sloped PC block that can be introduced and that can easily cope with uneven surfaces.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 7 show an embodiment of the present invention, FIG. 1 is a perspective view of a sloped PC block, and FIG. 2 is AA of FIG.
A line sectional view, FIG. 3 is a sectional view taken along line BB of FIG. 1, FIG. 4 is a front view showing a method frame, FIG. 5 is a sectional view of a joint portion for connecting PC blocks, and FIG. FIG. 7 is a sectional view showing a fixing state of the PC block, and FIG. 8 is a schematic explanatory view showing a state of introducing prestress to the PC block.
FIG. 9 and FIG. 10 are front views showing an embodiment of the projecting portion, and FIG.
The figure is a front view showing a conventional example. 11 ... PC block for slope 12 ... Arm 13 ... Precast concrete block body 14 ... PC steel (PC wire) 15 ... Anchoring part 22 ... Law frame

Claims (1)

[Scope of utility model registration request] 1. A sloped PC block in which a large number of precast concrete block main bodies are fixed to a slope to construct a slope frame, wherein the precast concrete block main body is paired on two sides of a fixing portion fixed to the slope. The PC block for slopes is characterized in that the arm is formed in a straight line, and a PC wire rod in which prestress is introduced by a pretension system is provided in the longitudinal direction of the precast concrete block body.