JP2005163356A - Wall surface block and connecting metal fitting mounting method of wall surface block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall surface block and a connecting metal fitting mounting method of the wall surface block, which solve such a problem that blocks can't be piled up by inserting reinforcement into the blocks like concrete blocks because a long penetration hole for inserting the reinforcement into the blocks can't be made in a natural stone block. <P>SOLUTION: A penetration hole 3 with a short length is bored in an upper end on the same axis toward the inside from an upper end face and a lower end face of a natural stone block 1, and a recess section 4 communicated between inside deep ends of the penetration hole 3 is made in the back of the block to make it easy to make the penetration hole 3 by omitting perforation with a drill by the length of the recess section 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wall surface block made of stone, concrete, and the like, and a mounting method of a connecting metal fitting used for connecting the wall surface block to each other.

  Conventionally, as a method for assembling a wall surface block and a retaining wall by assembling wall surface blocks, a block is built up sequentially from the bottom upward while inserting a support steel rod as a reinforcing bar in the block. The method is widely known. Also, in the case of natural stone blocks and wall materials, connecting metal fittings such as anchor bolts or mounting metal fittings made of channel steel are provided on the back, and wall surfaces, retaining walls, etc. are connected via these connecting metal fittings and attachment metal fittings. Various methods are known, such as a method of building

JP 2002-250043 A Japanese Patent No. 2862859 JP 2002-327500 A JP 2000-257087 A

  Among the wall blocks, in the case of concrete blocks, through holes can be provided in the blocks in advance to form the rebars during molding. Can be inserted. However, in the case of a block made of natural stone, a through hole for inserting a reinforcing bar into the block must be drilled from the upper end surface of the block toward the inside of the block. There is a limit to the length that can be provided, and there is a problem that the operation of providing the through hole cannot be performed accurately and efficiently.

  Therefore, in the case of a natural stone block, instead of providing a through hole for inserting a reinforcing bar in the block, for example, as shown in Patent Document 2, anchor bolts are driven into the back surface of the block, and adjacent portions The anchor bolts are connected together by connecting wires, but if a natural stone block or wall material is used, a through-hole into which a reinforcing bar can be inserted is easily drilled in the same way as a concrete block. If we were able to do this, it would be possible to construct this kind of block and wall material more efficiently and build a strong wall surface.

  Moreover, in the case of a small plate having a thickness of about 30 to 80 mm, such as a wall material made of natural stone, among the wall blocks (for example, a natural stone material having a thickness of about 70 mm, a width of 300 mm, and a length of about 900 mm is used as a retaining wall. When using for wall material, formwork, etc., the depth of the anchor bolt insertion hole drilled in the plate thickness direction from the back surface is such that a reliable pullout strength can be obtained after the construction in which the bolt is embedded If the depth is set sufficiently, the thickness of the bottom of the hole will be reduced, and when the head of the anchor bolt inserted into the hole is struck with a hammer, the thickness of the bottom of the hole will be insufficient and the insertion hole will be destroyed. It has the problem of being done. In addition, in the insertion hole, the inner end of the anchor bolt expands in a wedge shape, so that an excessive force acts around the hole and the wall material is destroyed at the hole portion. Yes.

  The present invention provides a through-hole from the upper end surface of the wall surface block to the inside as a means for solving the above-described problems in the method for attaching the wall surface block and the connecting metal fitting, which has been conventionally known. By providing a recess on the back of the block, natural stone blocks and wall materials can be easily drilled with through-holes that can be used to insert reinforcing bars, and not only natural stone and concrete but also recesses and through-holes. The purpose of the present invention is to provide a wall block in which the connecting fitting can be easily attached without damaging the block, and a method for attaching the connecting fitting for the block.

  The wall block according to the present invention, as a specific means for that purpose, is provided with through holes arranged on the same axis line from the upper end surface and the lower end surface of the natural stone wall material to the inside of the wall material, respectively. The back surface is provided with a recess in which the thickness of the wall material is deleted so that the inner and inner ends of both through holes communicate with each other.

  As an example of the concave portion provided on the back surface of the natural stone wall material, the concave portion is provided so as to communicate between the inner and rear ends of the hole along the length direction of the through hole arranged at the upper end of the same axis. A through-hole that has a concave groove shape and passes through the recess from the upper end surface of the wall material and reaches the lower end surface of the wall material is a hole for inserting a bolt-type steel rod. Some shapes are possible.

  Furthermore, the concave portion provided on the back surface of the natural stone wall material is formed by removing the wall material back surface portion excluding the upper end surface and the lower end surface of the wall material so that the meat becomes thin, or on the wall material. It may be formed by thinly removing the wall material rear surface portion excluding the end surface, the lower end surface, and the central portion connecting the upper and lower end surfaces.

  The bolt type steel rod inserted into the through hole that opens from the upper end surface to the lower end surface of the wall material is provided with a male screw over its entire length, and a nut is screwed in the vicinity of the opening of the through hole. By being fastened to the through-hole opening, it is configured to be integrally fixed in the through-hole.

  When inserting the bolt-type steel rod into the through-hole, the bolt-type steel rod is inserted into an eccentric position where the axis of the bolt-type steel rod is on the surface side of the wall material with respect to the axis of the through-hole, and fitted to the bolt-type steel rod. It is preferable to fix the bolt type steel rod to the through hole by locking the washer to the opening of the through hole by the locking protrusion and tightening the nut.

  As means for maintaining the state where the bolt-type steel rod is inserted into the central portion in the through hole, a pair of locking projections are provided at both front and rear ends of the washer fitted to the bolt-type steel rod. The bolt-type steel rod may be fixed to the through hole by locking the locking projection piece to the opening of the through hole and tightening the nut.

  In the case of including not only natural stone but also a concrete block, a method of attaching the coupling metal using the through hole and the concave portion is conceivable. In this method, a through hole is drilled inward from the upper end surface of the block, and the inner surface of the back surface of the block is perpendicular to the lower end portion of the through hole and has an inner diameter larger than the inner diameter of the through hole. A concave portion having a horizontal hole shape is provided, and an anchor bolt is inserted into the through hole, and an upper end of the anchor bolt is tapped, whereby the lower end portion of the bolt is expanded and locked in the concave portion.

  Similarly, in the case of natural stone, concrete blocks, etc., as a method of attaching the connecting bracket using the recess and the through hole, a recess for inserting a bolt is provided on the back of the block, and A through hole is drilled from the end surface into the recess, and the bolt inserted into the recess has a locking hole in the inner end that is orthogonal to the axial direction. When inserted into the bolt, the tip of the support steel wire inserted through the through hole is inserted into the locking hole of the bolt, so that the bolt is inserted into the recess, and the connecting bracket is attached to the outer end of the bolt with a nut. It may be fixed.

  The wall surface block according to the present invention has through holes arranged on the same axis from the upper end surface and the lower end surface of the block toward the inside, and the inner surface of the through holes is formed on the back surface of the block. Since the recess is provided with the wall thickness removed so that the ends communicate with each other, even in the case of a natural stone block, the drilled through-hole is between the upper end surface of the block and the recess, and between the recess and the lower end surface. Since it is only necessary to provide a short portion connecting the holes, and the drilling of the recesses can be omitted, there is no need to drill a through hole over the entire length of the plate width. The insertion hole can be easily provided, and a strong retaining wall and wall surface can be constructed by the internal insertion reinforcing bar like a concrete block.

  When the concave portion provided on the back surface of the block is formed into an oval concave groove shape along the length direction in which the through hole is provided, the width is small compared to the size of the back surface of the block, and it is easy to delete. Can be easily provided. In addition, short through holes are drilled on the same axis in advance from the upper end surface and the lower end surface of the block, and then the inner rear ends of these through holes are communicated with the back surface of the block. Since it is only necessary to provide such a recess, all the through holes can be short, and the drilling process of the through holes can be performed easily and efficiently.

  Recesses formed on the back surface of the block are formed by thinly removing the wall material back surface portion excluding the upper end surface and lower end surface of the wall material, or the upper and lower surfaces of the wall material In the case where the wall material back surface part excluding the center part connecting both end faces is deleted thinly, most of the thick part on the back surface of the block is deleted, so the shape seen from the block surface While maintaining the natural stone style, the weight of the block can be greatly reduced, and the construction work can be carried out efficiently.

  In addition, in the case where the concave portion is formed by thinly removing the wall material back surface portion excluding the upper end surface and the lower end surface of the wall material and the central portion between the upper and lower end surfaces, the middle of the upper and lower end surfaces Since the thick part which is not deleted is left in the part and this part functions as a reinforcing part of the wall material, the weight of the block can be greatly reduced and the strength can be obtained.

  Bolt-type steel rods inserted into the through-holes in the wall material are screwed into the screws with the number of washers and nuts required for tightening when they are inserted into the through-holes so as to connect the stacked wall materials to each other. In addition, these washers and nuts can be tightened to the opening of the through-hole later and fixed integrally with the wall material to increase the overall strength of the wall material stacked together.

  When building the wall surface by connecting the wall materials stacked together as described above with bolt-type steel bars and pulling these steel bars exposed on the back side of the wall material in the ground direction on the back side, If the tightening force of the nut screwed into the hole opening is loose, the steel rod is pulled and bent into a dogleg shape, and the vicinity of the opening of the through hole may be damaged by receiving an improper impact force.

  In consideration of such circumstances, when inserting the bolt-type steel rod into the through-hole, the axis of the bolt-type steel rod is inserted into an eccentric position that is on the surface side of the wall material from the axis of the through-hole. In addition, when a locking protrusion is provided on a part of the washer fitted to the bolt-shaped steel rod, the locking protrusion is locked to the opening of the through hole and the nut is tightened. The rod axis can be kept eccentric from the axis of the through-hole to the wall material surface side, and even when the steel rod is pulled, the amount of bending and moving is reduced. Thus, the breakage rate in the vicinity of the opening of the through hole can be suppressed.

  Also, as means for stably fixing the bolt-type steel rod inserted through the through-hole, a pair of locking projections are provided at both ends of the washer fitted to the bolt-type steel rod, and these locking projections are Locking in a pair of recesses provided in the opening of the through hole prevents the steel bar from moving in the through hole by the washer even if the steel bar is pulled to the side. Helps prevent damage.

  An example of a method for attaching a connecting bracket using a recess and a through hole provided in a stone or concrete block is a method of inserting an anchor bolt into the through hole. In this method, the lower end of the anchor bolt is Since it is supported by the inner peripheral surface of the horizontal hole-shaped recess corresponding to the bottom of the through hole, if the upper end of the anchor bolt is struck in that state, the lower end of the bolt can be immediately expanded and locked in the recess. Can be installed efficiently and safely.

  As another method for attaching the connecting metal fitting using the recess and the through hole as described above, a recess for inserting a bolt is provided on the back surface of the block and the block is directed from the upper end surface into the recess. There is a method of drilling a through hole and inserting a bolt having a locking hole in a direction orthogonal to the axial direction into the recess. In this method, when the bolt is inserted into the recess, the through hole If the tip of the support steel wire is inserted through the locking hole, the bolt can be fixed in the recess, and the connecting fitting can be freely attached to the outer end of the bolt via the nut.

  In the embodiment in which the concave portion provided on the back surface of the block is a concave groove shape along the length direction where the through hole is provided, on the planned line where the through hole is provided, by a cylindrical drill having an outer diameter larger than the thickness of the through hole, By providing ring-shaped cuts so as to overlap along the length direction of the through-holes and cutting the inside of these cuts, a recess with a desired length can be easily obtained. Is easy and efficient, so it is suitable for implementation.

  Next, the structure of the wall block according to the present invention and the method of attaching the connecting metal fitting provided on the wall block will be described with reference to the embodiments shown in the drawings. FIG. Such a steel rod is piled up with each other while inserting bolt-type steel rods 2 provided with male screws over the entire length thereof, and means for providing through holes 3 necessary for inserting the bolt-type steel rods 2 in the wall material 1 As an example, a concave groove-shaped concave portion 4 along the length direction of the through hole 3 is provided on the back surface of the wall material 1.

  When a concave groove-shaped concave portion 4 along the length direction of the through hole 3 is provided as a concave portion provided on the back surface of the wall material 1, as shown in FIG. Through holes 3 for inserting the bolt-type steel rods 2 from the upper end surface 1a toward the interior of the wall material 1 and from the lower end surface 1b of the wall material 1 toward the interior of the wall material 1 are arranged on the same axis. A concave groove-shaped recess that is drilled so as to communicate with each other and then communicates with the inner ends of both through-holes 3 on the back surface of the wall material 1 where both inner ends of both through-holes 3 are located. 4 is cut along the length direction of the through-hole 3.

  When the concave groove-shaped concave portion 4 is provided, as shown in FIG. 3, the ring-shaped cut line 5 is inserted into the through-hole by a cylindrical drill having an outer diameter of about 2 to 5 times the thickness of the through-hole 3. A plurality of recesses 4 having a desired length can be obtained by providing a plurality so as to overlap with each other along the length direction 3 and then cutting off the inner portions of these cut lines 5.

  In this way, the wall material 1 in which the through holes 3 are formed on both the upper and lower surfaces and the concave groove-shaped recess 4 is cut on the back surface is located above the joints of the left and right wall materials 1 and 1 as shown in FIG. These wall materials 1 are stacked together, with the bolt-type steel rods 2 being inserted through the through-holes 3 communicating with each other in the upper and lower wall materials 1.

  Normally, when a through hole for inserting a bolt-type steel rod is made in a wall material, the through hole must be provided over a long distance from the upper end surface to the lower end surface of the wall material, and the length of the drill is large. However, there is a problem that the axis of the through hole is bent and it is difficult to provide an appropriate through hole. As described above, the through hole 3 is first drilled from both the upper and lower surfaces of the wall material 1 and then the back surface of the wall material. If a concave groove 4 that communicates the inner ends of these through holes is provided, the concave portion 4 does not need to be provided with the through holes 3, so that the axis of the through holes can be bent, The problem that a hole cannot be provided can be solved, and an appropriate through-hole can be easily provided.

  As another shape of the concave portion provided on the back surface of the natural stone wall material, as shown in FIG. 4, necessary strength can be maintained on the upper end surface 1 a and the lower end surface 1 b along the length direction of the wall material 1. It may be formed by leaving the reinforcing sides 11a and 11b and deleting the thickness of the portion excluding these reinforcing sides 11a and 11b so as to be thin. In this case as well, before the recess 4 is provided, the through hole 3 is provided from the upper end surface 1a and the lower end surface 1b toward the inside of the wall material, and then the recess 4 is formed on the back surface of the wall material.

  As a method of deleting so that the thickness of the portion excluding the reinforcing sides 11a and 11b is reduced, as shown in FIG. 5, the inner side of the upper end surface 1a and the lower end surface 1b on the back surface of the wall material 1 is rotated. The cutting groove 12 having a predetermined depth is cut by the blade 13. Next, a large number of similar notch grooves 12 are cut between these notch grooves 12 at intervals, and all the thick portions of the portions provided with these notch grooves 12 are scraped off, and the reinforcing side 11a is formed on the back surface. , 11b is provided with a recessed portion 4 having a thickness smaller than that of 11b.

  FIG. 6 is another embodiment, and the strength required for the upper end surface 1a and the lower end surface 1b along the length direction of the wall material 1 and the central portion connecting the upper end surface 1a and the lower end surface 1b. The reinforcing sides 11a, 11b, and 11c that can hold the components are left, and the thickness of the portion excluding these reinforcing sides 11a, 11b, and 11c is deleted so as to be thinned. Also in this case, before providing the recess 4, the through hole 3 is provided from the upper end surface 1a and the lower end surface 1b toward the inside of the wall material, and then the recess 4 is formed on the back surface of the wall material.

  In order to delete the thickness of the portion excluding the reinforcing sides 11a and 11b and the central portion reinforcing side 11c so as to be thinned, as shown in FIG. As a starting point, a large number of cut grooves 12 whose depth gradually increases toward both sides are cut in parallel, and the thick portion of the portion where these cut grooves 12 are provided is cut away later, thereby reinforcing the central reinforcement side. Recesses 4 having a reduced thickness are provided on both sides of 11c. As shown in FIG. 1, the wall material 1 provided with the recesses 4 is arranged so that the upper wall material 1 is placed on the joint between the left and right wall materials 1, 1, and the upper and lower wall materials 1 communicate with each other. Bolt type steel rods 2 are inserted into the holes 3 and the wall materials 1 are stacked together.

  When the bolt-type steel rod 2 is inserted into each through-hole 3, the number of washers 7 and nuts 6 corresponding to the through-hole 3 are screwed to the threaded portion of the steel rod 2 every time the through-hole 3 is passed. As shown in FIG. 2, these nuts 6 are fastened and fixed to the respective through-hole openings 3 a to fix the steel rod 2 to the wall material 1.

  In this way, when the wall materials 1 stacked on each other are connected by the bolt-type steel bar 2, as shown by the arrows in FIGS. 2 and 8, in order to give tension to the stacked state of the wall materials 1, The steel bar 2 exposed on the back surface of the wall material 1 is pulled in the back ground direction. In this case, if the tightening force of the nut 6 screwed into the through hole opening 3a of the steel bar 2 is loose, When the steel bar 2 is pulled in the back ground direction, as shown in FIG. 8, the steel bar 2 may be bent in a dogleg shape and the vicinity of the through-hole opening 3 a may be damaged by receiving an impact force.

  In order to cope with such a situation, when the bolt-type steel bar 2 is inserted into the through-hole 3, the axis A of the bolt-type steel bar 2 is more walled than the axis B of the through-hole 3 as shown in FIG. A locking protrusion 8 is provided at one end of a washer 7 fitted to the bolt-type steel rod 2 and inserted into an eccentric position on the surface side of the material 1. Is locked in the recess 9 provided in the through-hole opening 3a, and the nut 6 is tightened.

  Thus, the washer 7 fixed to the through-hole opening 3a can maintain the state in which the axis A of the steel rod 2 is eccentric from the axis B of the through-hole 3 toward the wall surface. Even when the steel bar 2 is pulled as indicated by the arrows in FIG. 8, the amount of the steel bar 2 bent and moved in a U-shape is reduced, and the damage rate in the vicinity of the through-hole opening 3a can be suppressed. it can.

  Furthermore, as another embodiment, as shown in FIG. 10, a pair of locking projections 8 are provided at both front and rear ends of a washer 7 to which the bolt-type steel bar 2 is fitted, and these locking projections 8 are provided. Is fastened in a pair of recesses 9 provided in the through-hole opening 3a, and the nut 6 is tightened. In this case, the bolt-type steel bar 2 can be inserted and arranged in the center of the through hole 3.

  The above embodiments are all examples using natural stone wall materials, but not only natural stone wall materials, but also when including concrete blocks, the recesses and through holes are used. Therefore, it is possible to easily and efficiently attach the connecting metal fittings required for stacking, not only natural stones but also blocks.

  The embodiment shown in FIG. 11 is an example in the case where the anchor bolt 25 is projected from the upper end surface 21 a of the block 21. However, the recess 24 is provided on the back surface of the block 21, and the recess 21 extends from the upper end surface 21 a of the block 21. The configuration of providing the through hole 23 with respect to 24 is the same as the configuration of the above embodiment.

  In this embodiment, a through hole 23 for inserting an anchor bolt 25 is drilled vertically from the block upper end surface 21a toward the inside of the block. The through hole 23 has an inner diameter into which the anchor bolt 25 before the lower end has not been expanded yet can be inserted, and a depth at which the upper end of the bolt can protrude above the block upper end surface 21a with a correct length. .

  On the other hand, a concave portion 24 having a horizontal hole is drilled laterally from the back surface of the block toward the lower end portion of the through hole 23 so as to be orthogonal to the through hole 23. The horizontal hole-shaped recess 24 has an inner diameter larger than the inner diameter of the through hole 23 and has a depth such that the tip 24 a is located at a portion slightly beyond the lower end of the through hole 23.

  In this method, when the anchor bolt 25 before expanding the lower end is inserted into the through hole 23, the lower end of the anchor bolt 25 is supported by the inner peripheral surface of the horizontal hole-shaped recess 24 corresponding to the bottom of the through hole 23. In this state, when the upper end of the anchor bolt 25 is struck as shown in FIG. 11, the outer diameter of the bolt lower end 25a divided by the slit 26 is enlarged by the outer peripheral surface of the cone 27, so As a result, the anchor bolt 25 can be mounted efficiently and safely.

  Next, the embodiment shown in FIG. 14 is an example in which a normal bolt 35 is projected on the back surface of the block 31 instead of the anchor bolt. The structure of the point which provides the through-hole 33 with respect to the said recessed part 34 from the upper end surface 31a is common in the structure of the said Example.

  In this embodiment, the through-hole 33 is vertically drilled from the block upper end surface 31a toward the inner back, and then a normal bolt 35 is inserted from the back surface of the block 31 into the block. The recess 34 is drilled laterally so as to be orthogonal to the through hole 33.

  The through-hole 33 is not only opened in a part of the recess 34, but also passes through the inner wall of the recess 34 so as to be opened in a part on the opposite side of the opening. The recess 34 is set to have an inner diameter that allows the lower end of the bolt 35 to be inserted, and a depth at which the upper end of the bolt can protrude from the back surface of the block 31 with an appropriate length that allows a nut to be attached. Yes.

  In the bolt 35, a locking hole 36 for inserting the support steel rod 32 inserted into the through hole 33 is provided at a tip portion inserted into the recess 34 in a direction perpendicular to the bolt axial direction. Yes. When the bolt 35 is inserted into the recess 34, the locking hole 36 is inserted in such a direction as to communicate with the axial center of the through hole 33, and the tip of the support steel wire 32 inserted from the upper end of the through hole 33 is connected to the bolt. The bolts 35 are fixed so as not to come out of the recesses 34 by being inserted into the locking holes 36. A connection fitting 38 is attached to the bolt 35 via a nut 37.

  The wall surface block of the present invention is provided with a short through hole at the upper end of the same axis from the upper end surface and the lower end surface of the block to the inside, and the back surface of the block is provided between the inner and inner ends of the through hole. Reinforcing holes that have been made impossible even in the case of natural stone blocks can be easily provided in the case of natural stone blocks. Wall surfaces can be constructed.

  Further, as in the embodiment shown in FIGS. 11 and 12, when the anchor bolt is provided in the block, if the lower end of the bolt is expanded only in the bolt insertion hole as in the prior art, the lower end of the bolt The inner wall of the bolt insertion hole may be strongly pressed to destroy the wall material. However, in the case of the present invention, a recess having a larger inner diameter than the through hole is provided at the lower end of the through hole. Since the lower end of the can be expanded in the recess without applying pressure to the surrounding wall surface, the bolt can be fixed without destroying the wall material.

  Further, in the conventional stacking work of wall materials, it is common sense to use anchor bolts, and ordinary bolts are not used. However, in the case of FIG. 14, normal bolts and nuts are used instead of anchor bolts. Can be used, so construction can be carried out economically.

The back view which shows an example of the structure of the block for wall surfaces which concerns on this invention. Sectional drawing in the AA of FIG. Explanatory drawing which shows an example of the recessed part shaping | molding method provided in the back surface of the block for wall surfaces. The back view which shows another example of the structure of the block for wall surfaces which concerns on this invention. The perspective view which shows an example of the recessed part shaping | molding method in the block of FIG. The back view which shows another example of the structure of the block for wall surfaces which concerns on this invention. Sectional drawing which shows an example of the recessed part shaping | molding method in the block of FIG. Sectional drawing of the state in which the bolt type steel rod was pulled in the direction of the arrow in the through hole. Sectional drawing of the structure which fixes a bolt-type steel bar to the eccentric position in a through-hole. Sectional drawing of the structure which fixes a bolt type steel bar to the concentric position in a through-hole. Sectional drawing which shows an example of the attachment method of the connection metal fitting provided in a block. FIG. 11 is a cross-sectional view showing a state in which the coupling fitting of FIG. 10 is attached to a block. Sectional drawing in the BB line of FIG. Sectional drawing which shows another example of the connection metal fitting attachment method provided in a block.

Explanation of symbols

1: Wall material
1a: Wall material upper end surface,
1b: wall material lower end surface,
1c: Central part 2: Bolt type steel bar,
3: Through hole,
3a: through-hole opening,
4: Recess,
5: score line,
6: Nut,
7: Washer
8: Locking protrusion
9: depression,
11a: reinforcement side,
11b: reinforcement side,
11c: reinforcement side,
12: Cut groove,
13: rotary blade,
21: Block,
21a: block upper end surface,
23: through hole,
24: recess,
25: Anchor bolt,
25a: Anchor bolt lower end,
26: slit,
27: Corn
31: Block,
32: Support steel wire,
33: through hole,
34: recess,
35: Bolt,
36: locking hole,
37: nut,
38: Connection fitting,

Claims (9)

  Through holes arranged on the same axis are drilled from the upper end surface and lower end surface of the natural stone wall material to the inside of the wall material, respectively. A wall surface block provided with a recess in which the thickness of the wall material is removed so as to communicate.   The concave portion provided on the back surface of the natural stone wall material has a concave groove shape along the length direction in which the through hole is provided, so that it passes through the concave portion from the upper end surface of the wall material and reaches the lower end surface of the wall material. 2. The wall surface block according to claim 1, wherein the through holes formed on the same axis are holes for inserting bolt type steel bars.   A recess provided on the back of the natural stone wall material is formed by removing the wall material back surface portion excluding the upper end surface and the lower end surface of the wall material in a thin shape, and passes through the recess from the upper end surface of the wall material. The wall block according to claim 1, wherein the through-hole drilled on the same axis so as to reach the lower end surface of the wall material is a hole for inserting a bolt-type steel rod.   The concave portion provided on the back surface of the natural stone wall material is formed by thinly removing the wall material back surface portion excluding the upper and lower end surfaces of the wall material and the central portion connecting the upper and lower end surfaces, and the wall 2. The wall surface of claim 1, wherein the through hole formed on the same axis so as to pass through the recess from the upper end surface of the member and open to the lower end surface of the wall member is a hole for inserting the bolt-type steel rod. block.   The wall surface block according to any one of claims 2 to 4, wherein a bolt-type steel rod inserted into the through hole is fastened and fixed to the opening of the through hole by a nut.   Insert the bolt-type steel rod into the through hole in an eccentric position where the axis of the steel rod is on the surface side of the wall material with respect to the axis of the through hole, and lock the washer fitted to the steel rod The wall block according to claim 5, wherein the bolt-type steel rod is fixed to the through hole by being locked to the opening of the through hole by the projecting piece and tightening the nut.   A bolt-type steel rod is inserted into the through hole so that the axis of the steel rod is concentric with the axis of the through hole, and a pair of members projecting from both ends of the washer fitted to the steel rod. The wall block according to claim 5, wherein the bolt-type steel rod is fixed to the through hole by locking the stop protrusions to the openings of the through holes and tightening the nuts.   A through hole is drilled inward from the upper end surface of the block made of natural stone or concrete, and the back surface of the block is perpendicular to the lower end portion of the through hole and larger than the inner diameter of the through hole. A connecting bracket for a wall in which a recess having an inner diameter is provided, an anchor bolt is inserted into the through-hole, and the upper end of the anchor bolt is struck to expand and lock the lower end of the bolt in the recess. How to install.   The concave portion provided on the back side of the block made of natural stone or concrete is a hole for inserting the lower end of the normal bolt, and the bolt has a locking hole in the direction perpendicular to the axial direction at the lower end portion. When the bolt is inserted into the recess, the tip of the support steel wire inserted through the through hole is inserted into the locking hole of the bolt so that the bolt is inserted and locked in the recess. A method of attaching a connecting bracket to a wall block in which a connecting bracket is fixed to the end with a nut.

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