JP2017082420A - Construction method of dry masonry retaining wall block with slide resistance plate installed therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a dry masonry retaining wall block with a slide resistance plate installed therein, the construction method eliminating a need on filler level adjustment and enabling filler injection work to be completed in a step.SOLUTION: A slide resistance plate is erected on a rear wall 11, and temporarily fixed on a block A so that the slide resistance plate installed would not move or topple. The temporarily fixed slide resistance plate is restored to a state separated from the block A, by releasing the temporarily fixed state in a work process for filling an infilling material and a back-filling material in spaces inside and outside of the block A, or by having the temporarily fixed state released by earth pressure exerted after the filler injection work.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for constructing an empty stacked retaining wall block in which a sliding resistance plate is installed, and more particularly to a method for constructing an empty retaining wall block in which a sliding resistance plate is installed without being moved or toppled.

  Conventionally, there exists what was disclosed by patent document 1 as one form of the construction method of the empty loading retaining wall block in which the sliding resistance board was installed. That is, in Patent Document 1, empty stacked retaining wall blocks (hereinafter sometimes simply referred to as “blocks”) are stacked and laid along the retaining wall extending direction, and the stacked blocks are stacked. A construction method is disclosed in which a filling material is filled in and a sliding resistance plate is disposed so as to straddle the upper and lower boundary portions.

  If this construction method is demonstrated concretely, it is necessary to arrange | position a sliding resistance board in the standing position in the predetermined position in the up-and-down boundary part of the stacked block. The predetermined position here is a position determined by the distance from the front wall of the block to the sliding resistance plate and the height from the lower end surface of the block to the lower end surface of the sliding resistance plate.

  For this reason, when the sliding resistance plate is disposed, a filling material / back-filling material (hereinafter also simply referred to as “filling material”) may be provided at a predetermined height in the space inside and outside the disposed block. The level is adjusted by filling it up, leveling the top surface, and adjusting it. The level adjustment here means leveling and adjusting the upper surface of the filler so that the sliding resistance plate is placed at a predetermined height just by placing the sliding resistance plate upright on the upper surface of the filler. It is work to do.

  On the filler whose level is adjusted, the sliding resistance plate is arranged upright by using a resistance plate positioning jig in which a predetermined distance between the sliding resistance plate and the front wall is secured. Are arranged at predetermined positions.

  After the sliding resistance plate is placed at a predetermined position, the resistance plate positioning jig is brought into contact with the front surface of the sliding resistance plate, so that the sliding resistance plate is filled from the backfilling material first so that the sliding resistance plate does not move forward or fall. After that, the filling material is filled in the remaining upper layer space in the block.

Japanese Patent No. 5065527

  However, when adjusting the level of the filler, it is difficult to quickly and accurately dispose the sliding resistance plate at a predetermined position in the case of chestnut and the like having a large particle diameter.

  Also, when charging the filler, resist the sliding resistor plate from moving and falling until the filler charged on the front and rear sides of the sliding resistor plate reaches near the lower half of the sliding resistor plate. Since the front surface of the sliding resistance plate must be supported manually by the plate positioning jig, it is forced to perform inefficient work.

  In addition to these, there is a factor that significantly reduces workability. After placing the block, the filling material is thrown up to a predetermined height (about half) (lower filling), the sliding resistance plate is placed upright on the level-adjusted filling material, and a series of sliding resistance After the plate is placed, the filling operation process is performed in which the filler is again charged (upper filling) into the remaining upper layer space inside and outside the block. In other words, the filling operation process requires two steps of a lower filling process and an upper filling process. Therefore, not only is the filling operation divided into two steps, upper and lower, but the number of setups for each operation before and after the filling operation divided into these two steps is doubled, and the workability is significantly reduced. Yes.

  Therefore, the present invention arranges a sliding resistance plate on the rear wall of the block so that the level adjustment of the filler is not necessary, and temporarily moves the sliding resistance plate to the block to move, fall, An object of the present invention is to provide a method for constructing an empty retaining wall block in which a sliding resistance plate is installed, in which the charging operation is completed in one step by preventing the falling.

The invention described in claim 1
A block that has front, rear, left, and right side walls, and the height of the rear wall is lower than the height of the front wall is laid and stacked along the extending direction.
In the stacked blocks, the sliding resistance plate is placed in a state separated from the block, straddling the upper and lower boundaries, and the inside / outside space of the block is filled with backfill material Filling
Due to the action of earth pressure, the block and the sliding resistance plate are individually displaced, and a passive earth pressure is generated on the front side of the sliding resistance plate, and this passive earth pressure acts as a filling material between the sliding resistance plate and the rear wall. It is propagated to the inner surface of the rear wall through the building method of the empty retaining wall block that strengthens the sliding resistance of the block,
The sliding resistance plate is placed upright on the rear wall, and the sliding resistance plate is temporarily fixed to the block so that the sliding resistance plate does not move, fall or fall.
In addition, the sliding resistance plate temporarily fixed can be released by releasing temporary fixing in the work process of filling the inside / outside space of the block with the filling material / backfill material or by earth pressure acting after the filling work. The temporary fixing is released, and the block is restored to a state separated from the block.

Invention of Claim 2 is invention of Claim 1, Comprising:
The sliding resistance plate placed upright on the rear wall is temporarily fixed to the left and right walls of the block.
It is characterized by filling the inside / outside space of the block with filling material / backfilling material and releasing the temporary fixing of the sliding resistance plate.

Invention of Claim 3 is invention of Claim 2, Comprising:
The inner surfaces of the left and right side walls are tapered inward and down,
A pair of left and right temporary fastening pieces are interposed horizontally between the taper surface of the left and right side walls and the left and right end surfaces of the sliding resistance plate, thereby facing the left and right side end surfaces of the sliding resistance plate. It is characterized in that a sliding force plate is temporarily fixed to the left and right side walls by applying a horizontal force.

Invention of Claim 4 is invention of Claim 1, Comprising:
The sliding resistance plate placed upright on the rear wall is temporarily fixed to the front wall of the block.
It is characterized by filling the inside / outside space of the block with filling material / backfilling material and releasing the temporary fixing of the sliding resistance plate.

Invention of Claim 5 is invention of Claim 4, Comprising:
Between the upper end of the front wall and the upper end of the sliding resistance plate, a temporary fixing body is detachably mounted,
The temporary fixing body includes a front fitting piece that is fitted to the upper end portion of the front wall from above and the movement in the front-rear direction is restricted by the front wall, and a temporary fixing book that extends rearward from the front fitting piece. And a rear fitting piece that is provided at the rear end portion of the temporary fixing book piece and is fitted to the upper end portion of the sliding resistance plate from above to restrict the movement of the anti-sliding plate in the front-rear direction. It is characterized by that.

Invention of Claim 6 is invention of Claim 1, Comprising:
The sliding resistance plate placed upright on the rear wall is temporarily fixed to the rear wall of the block,
The inside and outside spaces of the block are filled with filling material and backfilling material, and the temporary fixing is released by earth pressure acting after the filling operation.

The invention according to claim 7 is the invention according to claim 6,
On the upper part of the rear wall, while forming a lower pin insertion recess on the top opening,
In the lower part of the sliding resistance plate, an upper pin insertion concave portion of a lower surface opening that coincides with the lower pin insertion concave portion in the vertical direction is formed,
When placing the sliding resistance plate on the rear wall, the upper pin insertion recess formed in the sliding resistance plate is inserted into the upper pin insertion concave portion formed in a pin shape with the axis line directed vertically, The lower part of the temporary fixing pin is inserted into the lower pin insertion recess formed in the upper part of the rear wall, and temporarily fixed.
The temporary fixing pin is sheared by the earth pressure acting on the block and the sliding resistance plate, and the temporary fixing of the sliding resistance plate is released.

  According to the present invention, by arranging the sliding resistance plate on the rear wall of the block, the level adjustment work of the filler can be made unnecessary. And the operation | work which throws in the filler which is the next work process can be completed by one process by temporarily stopping the sliding resistance board arrange | positioned and preventing a sliding resistance board from moving, falling, and falling. As a result, workability can be dramatically improved.

Cross-sectional side explanatory drawing of the retaining wall which concerns on 1st Example. Sectional plane explanatory drawing of the lower part of the retaining wall which concerns on 1st Example. Sectional back surface explanatory drawing of the lower part of the retaining wall which concerns on 1st Example. The attachment back explanatory drawing of the temporary fix piece which concerns on 1st Example. The perspective view from the left front of the block which concerns on 1st Example. The perspective view from the left rear of the block which concerns on 1st Example. The front view of the block which concerns on 1st Example. The rear view of the block which concerns on 1st Example. The left view of the block which concerns on 1st Example. The top view of the block which concerns on 1st Example. Explanatory drawing of the 1st process which constructs the retaining wall concerning the 1st example. Explanatory drawing of the 2nd process which constructs the retaining wall concerning the 1st example. 3rd process explanatory drawing which builds the retaining wall which concerns on 1st Example. Explanatory drawing of the 4th process which constructs the retaining wall concerning the 1st example. Explanatory drawing of the 5th process which constructs the retaining wall concerning the 1st example. Explanatory drawing of the 6th process which constructs the retaining wall concerning the 1st example. 7th process explanatory drawing which builds the retaining wall which concerns on 1st Example. The perspective attachment explanatory drawing which shows the modification of the resistance plate for a boundary which concerns on 1st Example. The perspective attachment explanatory drawing of the auxiliary temporary fixing body which concerns on 1st Example. The perspective attachment explanatory drawing which shows the modification of the temporary fixing piece which concerns on 1st Example. The perspective attachment explanatory drawing of the temporary fixing body which concerns on 2nd Example. The rear view of the block temporarily fixed by the temporary fixing body which concerns on 3rd Example. Exploding perspective view of the temporary fixing body according to the third embodiment. Sectional back surface explanatory drawing which shows the attachment state of the temporary fixing body which concerns on 3rd Example.

  Embodiments according to the present invention will be described below. This embodiment is a construction method of an empty retaining wall block in which a sliding resistance plate is installed. In this construction method, the front wall has a front wall, a rear wall, a left wall, and a right wall, and the height of the rear wall is set to the height of the front wall. The blocks formed lower than this are laid and stacked along the extending direction. In the block that is stacked and overlapped with the upper and lower stages, the sliding resistance plate is placed in a state separated from the block across the upper and lower boundaries, and in the space inside and outside the block Filled with filling material and backfilling material. Then, due to the action of earth pressure, the block and the sliding resistance plate are individually displaced, and a passive earth pressure is generated on the front side of the sliding resistance board, and this passive earth pressure is packed between the sliding resistance board and the rear wall. Propagated to the inner surface of the rear wall through the material, the sliding resistance of the block is strengthened.

  In the construction method of the empty retaining wall block configured as described above, the sliding resistance plate is arranged upright on the rear wall and temporarily fixed to the block so as not to move, fall or fall during the work. . Temporarily fixed sliding resistance plate can be released by releasing temporary fixing in the filling work process to put the filler into the space inside or outside the block, or by earth pressure acting after filling work. To be. In other words, the block is restored to a state separated from the block.

  Here, the height of the front wall of the block, the length of the block, and the height of the rear wall are determined for each gradient so that the block can be adapted to a typical gradient of 5 minutes or 3 minutes. . In other words, even if the sliding resistance plate can be placed on the rear wall at a 5 minute gradient, the placement position of the upper block moves 2 minutes forward in the 3 minute gradient than in the case of 5 minutes. The sliding resistance plate placed on the wall comes into contact with the rear wall of the upper block, making it impossible to place the sliding resistance plate. Therefore, not only the sliding resistance plate placed on the rear wall of the block does not come into contact with the rear wall of the upper block, but also a space enough to smoothly fill the filler can be secured between the sliding resistance plate and the rear wall facing the sliding resistance plate. In this way, the height of the front wall of the block, the reserved length, and the height of the rear wall are determined for each gradient. Therefore, even in the case of a 5-minute or 3-minute gradient, the sliding resistance plate and the front wall can be separated from each other only by placing the sliding resistance plate upright on the upper surface of the rear wall of the horizontally arranged block. The distance from the wall, the height at which the sliding resistance plate is disposed, and the substantially vertical standing posture of the sliding resistance plate can be secured automatically and quickly.

  However, even if the sliding resistance plate is quickly and easily placed on the rear wall, if the sliding resistance plate cannot be prevented from moving, overturning, or dropping, it is not possible to put the filler in the state where it is placed. In addition, the filling operation itself and the safety of the operation are impossible. This is because the fall of the sliding resistance plate on the rear wall is directly connected to the fall. Therefore, in the worst case, even if the sliding resistance plate falls, it is absolutely necessary to prevent only the fall from the rear wall. For this purpose, it is indispensable to fill the filling material to the height of the rear wall before placing the sliding resistance plate on the rear wall to eliminate the falling space of the sliding resistance plate. The filling operation is divided into two steps, upper and lower. Then, even if the level adjustment of the filler is not required and the arrangement work of the sliding resistance plate is greatly improved, in the end, the conventional filling work of arranging the sliding resistance plate on the level adjusted filler, There will be no change.

  In consideration of such circumstances, in order to improve the overall workability, not only the placement of the sliding resistance plate, but also the movement, falling and falling of the sliding resistance plate placed on the rear wall is prevented. It is an important issue to finish filling the filler in one process without dividing it into the upper and lower processes.

  Therefore, in this embodiment, the sliding resistance plate is temporarily fixed to the block on the rear wall to prevent the sliding resistance plate from moving, toppling or dropping, thereby filling the space inside or outside the block. The work can be completed in one step without dividing it into two steps, upper and lower. As a result, not only filling work, but also other work and setup accompanying the filling work are halved, and the overall workability is dramatically improved.

  More specifically, by arranging the sliding resistance plate upright on the rear wall of the block, the distance between the sliding resistance plate and the front wall, the distance between the sliding resistance plate and the rear wall, and the arrangement of the sliding resistance plate It is possible to automatically ensure the height and the vertical standing posture of the sliding resistance plate. In addition, the sliding resistance plate can be quickly arranged. The sliding resistance plate is temporarily fixed to the block to prevent the sliding resistance plate from moving, falling, or dropping, so that the filling work for putting the filler into the space inside and outside the block is performed in two steps, upper and lower. It can be completed in one step without separation, and the workability is greatly improved.

  In addition, the sliding resistance plate can be restored to a state separated from the block by releasing the temporary fixing during the filling work process in which the filler is put into the space inside and outside the block, or after the filling work. The temporary fixing is released by the action of pressure, so that the block is restored to a separated state. Thus, by separating the sliding resistance plate from the block, passive earth pressure is generated on the front surface of the sliding resistance plate, and the sliding resistance plate can exhibit its function.

  The present embodiment configured as described above includes a first embodiment in which the sliding resistance plate is temporarily fixed to the left and right side walls of the block, a second embodiment in which the sliding resistance plate is temporarily fixed to the front wall of the block, and the block. And a third embodiment in which a sliding resistance plate is temporarily fixed to the rear wall. The first to third embodiments will be described below.

[First Embodiment]
In the first embodiment, a sliding resistance plate is arranged on the rear wall, and the sliding resistance plate is temporarily fixed to the left and right side walls of the block, so that the filling material and the backfilling material are placed in the space inside and outside the block. And the temporary fixing of the sliding resistance plate is released.

  More specifically, the inner surfaces of the left and right side walls of the block are formed in a tapered surface that is inclined inward and between the tapered surfaces of the left and right side walls and the left and right end surfaces of the sliding resistance plate. By horizontally interposing a pair of left and right temporary fixing pieces, a horizontal force is applied to the left and right side end surfaces of the sliding resistance plate to temporarily fix the sliding resistance plate to the left and right walls. ing.

  Moreover, since the side wall in which the temporary fixing piece interposes has a tapered surface, the temporary fixing can be easily released by pushing the temporary fixing piece upward from below during the filling operation process.

  In the first embodiment configured as described above, a pair of left and right temporary fixing pieces are horizontally mounted between the left and right side wall end surfaces of the sliding resistance plate disposed on the rear wall and the left and right side wall tapered surfaces. The sliding resistance plate is quickly temporarily fixed to the left and right side walls, and the inner and outer spaces of the block are filled with filling material and backfill material, and the temporary fixing piece is lowered during the filling operation. The temporary fixing can be easily released by pushing up from the top.

[Second Embodiment]
In the second embodiment, a sliding resistance plate is arranged on the rear wall, and the sliding resistance plate is temporarily fixed to the front wall of the block, so that the inside / outside space of the block is filled with filling material / backfilling material. In addition, the temporary stop of the sliding resistance plate is released during the filling operation process.

  More specifically, the temporary fixing body is detachably installed between the upper end portion of the front wall and the upper end portion of the sliding resistance plate. The temporary fixing body includes a front fitting piece that is fitted to the upper end portion of the front wall from above and the movement in the front-rear direction is restricted by the front wall, and a temporary fixing book that extends rearward from the front fitting piece. And a rear fitting piece that is provided at the rear end portion of the temporary fixing book piece and is fitted to the upper end portion of the sliding resistance plate from above to restrict the movement of the anti-sliding plate in the front-rear direction. .

  In the second embodiment configured as described above, the front fitting piece of the temporary fixing body is fitted to the upper end portion of the front wall of the block from above, while the upper end of the sliding resistance plate disposed on the rear wall. By fitting the rear fitting piece to the part from above, temporarily fixing it to the front wall, filling the inner and outer spaces of the block with the filling material and backfilling material, and in the filling work process, Temporary fixing can be easily released by releasing the front and rear fitting pieces upward.

[Third Embodiment]
In the third embodiment, after the sliding resistance plate is placed on the rear wall, the sliding resistance plate is temporarily fixed to the rear wall, and the inside / outside space of the block is filled with the filling material / backfilling material. The temporary fixing is released by earth pressure acting on the rear wall and the sliding resistance plate.

  More specifically, a lower pin insertion recess is formed in the upper portion of the rear wall at the upper portion of the rear wall, while an upper portion of the lower opening that coincides with the lower pin insertion recess in the vertical direction is formed in the lower portion of the sliding resistance plate. A pin insertion recess is formed. When the sliding resistance plate is placed on the rear wall, the upper portion of the temporary fixing pin formed with the axis line in the vertical direction is inserted into the upper pin insertion recess formed in the sliding resistance plate, and this temporary fixing The lower part of the pin is inserted and temporarily fixed in a lower pin insertion recess formed in the upper part of the rear wall. And if the earth pressure larger than the allowable shear force set to the temporary fixing pin acts on the block and the sliding resistance plate, the temporary fixing pin is sheared and the temporary fixing of the sliding resistance plate is released.

  In the third embodiment configured as described above, when a shear force greater than the allowable shear force acts on the temporary fixing pin that temporarily fixes the rear wall and the sliding resistance plate due to earth pressure acting on the rear wall and the sliding resistance plate. The temporary fixing pin is sheared, and the temporary fixing of the sliding resistance plate is released. As a result, the sliding resistance plate and the block are individually displaced to exert a passive earth pressure on the front surface of the sliding resistance plate, and this passive earth pressure is propagated to the inner surface of the rear wall, thereby strengthening the sliding resistance force of the block. Is done.

  Hereinafter, the first example according to the first embodiment, the second example according to the second embodiment, and the third example according to the third embodiment will be described in this order with reference to the drawings. To do. The first to third embodiments have the same basic structure, but have different structures for temporarily fixing and releasing the boundary resistor plate 30 described later. And the construction method of the retaining wall Y according to the second and third embodiments is a construction method including the first step to the seventh step as in the first embodiment, but the retaining wall Y according to the third embodiment. The construction method eliminates the need for artificially releasing the temporary fixing in the sixth step.

[Description of the structure of the empty block retaining wall according to the first embodiment]
FIG. 1 is a side cross-sectional explanatory view of an empty stacked block retaining wall (hereinafter, also simply referred to as “retaining wall”) Y constructed by the construction method according to the first embodiment. Retaining wall Y extends along the slope (protective floor) of riverbank K3 as the back ground, laying foundation part B in the direction of retaining wall extension, reinforced concrete block on foundation part B A is stacked in a staircase pattern, and the wall C is erected in the direction in which the retaining wall extends, and the boundary resistor plate 30 is disposed so as to straddle the upper and lower boundaries of the stacked blocks A. Is built. That is, as shown in FIG. 1, the retaining wall Y has a foundation B disposed in the ground of the river bed K1, and a lowermost block A is laid on the foundation B. A plurality of steps (five steps in the first embodiment) of blocks A are stacked in a staircase pattern, and a leaning wall C is erected. Further, in the first embodiment, a so-called potato stacking method is employed in which the upper block A is placed just above the block A. Reference numeral 26 denotes a suction prevention sheet stretched on the slope of the riverbank K3.

(Description of block structure)
As shown in FIGS. 5 to 10, the block A has a horizontally long rectangular plate-like front wall 10 and rear wall 11, and a pentagonal plate-like left side wall interposed between the left and right side portions of the front wall 10 and the rear wall 11. 12 and the right side wall 13 are formed in a rectangular cylinder shape having an upper surface and a lower surface that are open, and a hollow space S is formed therein.

  The front wall 10 and the rear wall 11 are arranged in parallel with each other in the front-rear direction in an inclined state (rear-tilt state) with front and rear and rear heights. The height of the rear wall 11 is formed to be lower than half the height of the front wall 10. In the first embodiment, the height of the rear wall 11 is set to 40% of the height of the front wall 10.

  The left side wall 12 and the right side wall 13 have the same height as that of the front wall 10. The rear end surface 12d of the left side wall 12 and the rear end surface 13d of the right side wall 13 are formed such that the lower portion is an inclined surface flush with the rear surface of the rear wall 11, and the upper portion is formed from the rear end edge of the upper end surface 11a of the rear wall 11. It is formed on a vertical surface that rises vertically. In this way, by forming the upper portions of the rear end surfaces 12d and 13d as vertical surfaces, the rear end upper portions of the left side wall 12 and the right side wall 13 are prevented from interfering with the workers during construction as much as possible. . The inner surfaces of the left side wall 12 and the right side wall 13 are tapered surfaces 12c and 13c that are inclined downward inward. That is, the space W1 between the tapered surfaces 12c and 13c in the left-right direction is formed so as to be gradually reduced from the upper side to the lower side. Columnar ridges 14 and 15 projecting vertically in the vertical direction are provided on the front side of the outer side surface of the left side wall 12 and the right side wall 13. Circular openings 16 and 17 penetrating in the left-right direction are formed in the rear upper portion of the outer side surfaces of the left side wall 12 and the right side wall 13. These openings 16 and 17 have the position of the lifting insert provided for demolding and reversal at the time of manufacturing the block A, that is, the center of gravity in the holding direction in the block A is located on the end side of the ridges 14 and 15. In addition, when mounting blocks 61 and 61, which will be described later, in the mounting holes 18 and 19 of the block A and stacking the blocks A, the center of gravity is slightly moved forward so that the block A can be kept horizontal. It is provided for moving to.

  The upper end surface of the block A, that is, the upper end surface 10a of the front wall 10, the upper end surface 12a of the left side wall 12, the upper end surface 13a of the right side wall 13, and the upper end surfaces 14a, 15a of the ridges 14, 15 are: They are formed on the same horizontal plane. The upper end surface 11 a of the rear wall 11 is formed in a horizontal plane parallel to the upper end surface 10 a of the front wall 10. Further, the lower end surface of the block A includes the lower end surface 10b of the front wall 10, the lower end surface 11b of the rear wall 11, the lower end surface 12b of the left side wall 12, the lower end surface 13b of the right side wall 13, and the ridge portion. The lower end surfaces 14b, 15b of 14, 15 are formed on the same horizontal plane. That is, the upper and lower end surfaces of the block A are formed in parallel horizontal planes, so that the blocks A can be stacked stepwise in a stable state.

  At the upper ends of the ridges 14 and 15, there are provided mounting holes 18 and 19 for mounting the lifting hardware set 60 (see FIG. 12 and FIG. 14), respectively. The upper ends of the protrusions 14 and 15 are opened at the upper ends. The mounting holes 18 and 19 are disposed in the vicinity of a virtual vertical plane that passes through the center of gravity of the block A and faces in the front-rear direction. The lifting hardware set 60 is intended to be interposed between a working machine such as a backhoe and a lifting object, and a pair of attachments 61 in which lower ends can be detachably attached to the attachment holes 18 and 19. , 61, connecting devices 62, 62 having lower ends connected to the upper ends of the attachments 61, 61, and a wire 63 spanned between the upper ends of both the connecting devices 62, 62. In the first embodiment, the mounting tools 61 and 61 can be detachably attached to the mounting holes 18 and 19 of the block A and the resistance plate mounting holes 32 and 33 of the boundary resistance plate 30 described later, so that a working machine such as a backhoe is provided. A middle part of the wire 63 can be detachably attached to the lifting function part.

  By forming the block A in this way, the attachments 61 and 61 of the lifting hardware set 60 are attached to the attachment holes 18 and 19, for example, on the bucket provided at the tip of the lift function part of the backhoe as a work machine When the middle part of the wires 63, 63 is attached and the block A is lifted / suspended by the lifting / lowering function part, the block A is suspended while being held in a substantially horizontal posture. The stacking and laying of A can be performed smoothly and steadily.

(Description of the basic structure)
As shown in FIGS. 1 to 3, the base portion B forms a groove groove Br along the retaining wall extending direction in the ground of the river bed K <b> 1, and a bottom support material is formed on the bottom of the groove groove Br. The bottom layer 24 is formed by laying and rolling, and the base resistance plate 20 made of reinforced concrete, which is a sliding resistance plate for the base portion, is disposed on the bottom layer 24, and the base portion is formed in the groove groove Br. The filling layer 23 is formed by filling a foundation chestnut stone (for example, 50 mm to 150 mm chestnut stone) D1 as a filler. Reference numeral 25 denotes a backfill unit.

  As shown in FIGS. 1 to 3, the basic resistance plate 20 is formed in a horizontally long rectangular plate shape in the retaining wall extending direction (left and right direction in the first embodiment), and is orthogonal to the retaining wall extending direction. It is arranged on the bottom layer 24 so as to stand up so that the longitudinal front surface is oriented in the direction (the front-rear direction in the first embodiment). The basic resistor plate 20 has a longitudinal width W2 formed narrower than the interval W1 between the tapered surfaces 12c and 13c of the left side wall 12 and the right side wall 13 of the block A, and the vertical width is set to the front wall of the block A. It is narrower than the height (vertical width) of 10 and wider than the vertical width of the boundary resistor plate 30. In the first embodiment, the vertical width of the basic resistor plate 20 is set to 80% of the vertical width of the front wall 10 of the block A. The front-rear width (wall thickness) of the basic resistor plate 20 is formed to be substantially the same as the front-rear width of the upper end surface of the rear wall 11. The lower part (substantially lower half part) of the basic resistor plate 20 is disposed in an embedded manner in the filling layer 23 formed by the filled basic chestnut stone D1. The upper part (substantially upper half part) of the basic resistor plate 20 is disposed so as to protrude upward from the upper surface of the filling layer 23. Then, the lowermost block A is placed on the upper surface of the filling layer 23 so as to surround the upper portion of the protruding basic resistor plate 20.

(Explanation of wall structure)
In the inner space S of the lowermost block A, a boundary resistance plate 30 made of reinforced concrete, which is a sliding resistance plate for the upper and lower boundary portions, is disposed so as to straddle the upper and lower boundary portions of the stacked blocks A. At the same time, it is filled with filling crushed stone (for example, 50 mm to 150 mm crushed stone) D2 as filling material. The outside space Ss of the block A is also filled with the chestnut D2 for filling. The back space Sb of the block A is filled with back-filling chestnut stone (for example, 50-150 mm chestnut stone) D3. Here, the outer space Ss is a space formed on the left outer side and the right outer side of the block A. The back space Sb is a space (back space) formed between the block A and the slope of the river bank K3.

  As shown in FIGS. 1 to 3, the boundary resistor plate 30 is formed in a horizontally-long rectangular flat plate shape in the retaining wall extending direction (left-right direction in the first embodiment). And the resistance plate 30 for a boundary is arrange | positioned on the upper end surface 11a of the rear wall 11 of the block A through the left-right paired concrete raising bases 40 and 40, and the retaining wall extension direction is set. The front surface of the horizontally long rectangle is oriented in the orthogonal direction (the front-rear direction in the first embodiment). Moreover, the boundary resistor plate 30 is formed such that the left and right width W3, which is the longitudinal width thereof, is narrower than the left and right width W2 of the basic resistor plate 20, and the vertical width is the height of the basic resistor plate 20 (vertical length). It is formed lower than (width). In this embodiment, the vertical width of the boundary resistor plate 30 is set to 70% of the vertical width of the front wall 10 of the block A. The front-rear width (thickness) of the boundary resistor plate 30 is formed to be substantially the same as the front-rear width of the upper end surface of the rear wall 11. Resistor plate mounting holes 32 and 33 for mounting the lifting hardware set 60 are respectively provided at the left and right upper ends of the boundary resistor plate 30. The resistor plate mounting holes 32 and 33 are directly in the vertical direction. The upper end is opened to the upper end surface 31 of the boundary resistor plate 30. The boundary resistance plate 30 may not be disposed between the blocks A and A placed on the upper level of the wall body C, which has a lower earth pressure than the lower level of the wall body C.

  As shown in FIGS. 1 to 3, the raising platform 40 is formed in a concrete rectangular parallelepiped shape that can be placed on the upper end surface of the rear wall 11 of the block A. The boundary resistor plate 30 arranged upright on the upper end surface of the rear wall 11 of the block A via a pair of left and right raised bases 40, 40 has a lower portion (lower half portion in the first embodiment) as a block. It is arranged in A, and the upper part (the upper half in the first embodiment) is arranged in a state of being inserted from below into the insertion space S of the block A stacked in the upper stage. ing. Here, the height of the raising base 40 is set to 25% of the height of the front wall 10 of the block A. The front and rear width of the raising base 40 is formed to be substantially the same width as the front and rear width of the upper end surface of the rear wall 11. Thus, the front-rear width (wall thickness) of the boundary resistor plate 30 and the front-rear width of the raising base 40 are formed to be substantially the same as the front-rear width of the upper end surface of the rear wall 11, so that the upper end surface of the rear wall 11 is formed. The boundary resistor plate 30 can be placed in a stable state via a pair of left and right raised bases 40, 40.

  In addition, as shown in FIG. 18, a boundary resistor plate 30 can be directly placed on the upper end surface 11 a of the rear wall 11, and in this case, the boundary is placed on the upper end surface 11 a of the rear wall 11. The resistance plate 30 can be placed in a stable state. In this case, the boundary resistor plate 30 is formed so as to have a height equal to the height of the raising base 40, and the boundary resistor plate 30 is placed in the insertion space S of the block A stacked in the immediately upper stage. While securing the height of the upper portion of the resistance plate 30 and forming the boundary resistance plate higher by the height of the raising base 40, the amount of mass of the passive region acting on the front surface of the resistance plate for boundary increases. The sliding resistance of the block A is further strengthened.

  As described above, the boundary resistor plate 30 is placed on the rear wall 11 of the block A directly or indirectly via the pair of left and right raising bases 40, 40, thereby the position of the boundary resistor plate 30 is changed. And the height is automatically determined, and the placement work of the boundary resistance plate 30 is remarkably improved.

  The boundary resistor plate 30 placed on the rear wall 11 of the block A is temporarily fixed to the left and right walls 12 and 13 by using temporary fixing pieces 50 and 51 as one method of temporarily fixing to the block A. By doing so, it is possible to prevent the boundary resistor plate 30 from moving, toppling and dropping, and to prevent an increase in work processes and a decrease in workability caused by the installation work of the boundary resistor plate 30. .

  The increase in the work process here means that the filling work of the filling crushed stone D2 and the backfilling material D3 must be carried out in two parts as in the prior art. That is, the preparatory work for the work before and after the two filling operations is also doubled.

  In other words, the increase in the work process means that after the block A is disposed, the lifting hardware set 60 is removed from the backhoe as a working machine, and the backpacking with the lifting hardware set 60 removed is used to fill the chestnut D2 and backfill The material D3 is filled up to the middle of the filling space S, the outer space Ss, and the rear space Sb of the block A, and after filling, the lifting hardware set 60 is attached to the backhoe again and filled up to the middle of the filling space S. The boundary resistor plate 30 is placed on the chestnut stone D2, and the remaining space such as the embedded space S surrounding the placed resistor plate 30 is filled with the filling chestnut stone D2. It is an increase.

  In the first embodiment, the boundary resistor plate 30 is disposed on the upper end surface 11a of the rear wall 11 directly or indirectly via a pair of left and right raised bases 40, 40, thereby providing a boundary resistor plate. The horizontal position and its vertical height are automatically determined with reference to the front wall 10 of the block A, which is a predetermined position of 30. At the same time, the boundary resistor plate 30 placed on the rear wall 11 is disposed between the left and right walls 12 and 13 of the block A.

  Then, as shown in FIG. 4, a pair of left and right temporary fastening pieces 50, 51 are provided between the left and right end faces 34, 35 of the boundary resistor plate 30 and the left and right walls 12, 13 facing each other. By interposing in a horizontal manner, the boundary resistance plate 30 can be surely temporarily fixed to the left and right side walls 12 and 13. As described above, the boundary resistance plate 30 placed in a temporarily fixed state on the upper end surface 11a of the rear wall 11 is then inserted into the block A by a working machine such as a backhoe and the chestnuts D2 for backpacking and the backfilling material. Due to the impact force and pressing force when D3 is thrown in, there is no risk of moving, falling, or dropping, and the work can proceed safely and firmly.

  As described above, hitherto-filled chestnut stone D2 that has been performed two times before and after the boundary resistor plate 30 is placed on the block A laid so as to form one step. In the first embodiment, the filling operation of the backfilling chestnut stone D3 is continued to the upper end surface of the block A by temporarily fixing the boundary resistance plate 30 on the upper end surface 11a of the rear wall 11. And you can do it once. In connection with this, the removal | desorption operation | work etc. of the lifting hardware set 60 can be completed by one time. That is, it is possible to halve the filling operation and the detaching operation of the lifting hardware set 60 that have been performed twice each in the past. As a result, the work process for constructing the retaining wall Y is shortened, and each workability is improved. In addition, it is not necessary to maintain the resistance plate 30 through the resistance plate positioning jig manually so that the boundary resistance plate 30 is not moved or toppled by the filled material. Safety is greatly improved.

  Next, the structure for temporarily fixing the boundary resistor plate 30 will be specifically described. As shown in FIG. 4, the pair of left and right temporary fixing pieces 50 and 51 are each formed in a bar shape having an axis line in the left and right direction. In the first embodiment, wooden square members extending in the left-right direction are used as the temporary fixing pieces 50, 51, and the length of the temporary fixing pieces 50 (51) in the left-right direction is the left side wall 12 (right side wall 13). Is formed to have a length substantially the same as the distance between the upper part of the inner surface of the substrate and the middle part of the left end face 34 (right end face 35) of the boundary resistor plate 30 placed on the rear wall 11, and is temporarily fixed within the interval. It is detachable between an installation posture (see FIG. 15) in which the piece 50 (51) is horizontally laid and interposed, and a removal posture (see FIG. 16) removed from the interval. Further, the spacing between the left and right sides for interposing the temporary fixing pieces 50 and 51 in a horizontal manner is set to be substantially the same, and the temporary fixing pieces 50 and 51 are also formed to have substantially the same length. , 51 can be shared with each other, and the disposition position of the boundary resistor plate 30 in the left-right direction can be automatically set at the center between the left and right walls 12, 13.

  When each boundary resistance plate 30 is temporarily fixed (fifth step described later), the upper portions of the tapered surfaces 12c and 13c of the left and right walls 12 and 13 and the left and right end surfaces of the boundary resistance plate 30 are used. A pair of left and right temporary fixing pieces 50 and 51 are respectively interposed horizontally between the intermediate portion and at least one of the temporary fixing pieces 50 (51) is pushed downward, whereby a boundary resistance plate A horizontal force is applied to the left and right side end faces of 30 so that the boundary resistor plate 30 is temporarily fixed on the rear wall 11 with the left side wall 12 and the right side wall 13 sandwiched therebetween. .

  More specifically, the tapered surface 12c of the left side wall 12 inclined inward (tapered surface 13c of the right side wall 13) and the left side end surface 34 (right side end surface 35) of the vertical boundary resistor plate 30 are described. Is gradually reduced from above to below. Therefore, the outer end portion 50a (51a) of the temporary fixing piece 50 (51) is brought into contact with the tapered surface 12c of the left side wall 12 (tapered surface 13c of the right side wall 13), and the left end surface 34 of the boundary resistor plate 30 is contacted. The inner end portion 50b (51b) of the temporary fixing piece 50 (51) is brought into contact with the (right end surface 35) so as to be interposed horizontally.

  When one or both of the temporary fastening pieces 50 (51) are pushed downward, the outer end portion 50a (51a) of the temporary fastening piece 50 (51) pushed downward is the tapered surface 12c of the left side wall 12. Guided inward and downward (tapered surface 13c of right side wall 13), temporary fixing piece 50 (51) is slightly moved inward.

  As a result, horizontal pressing force is generated from the temporary fixing piece 50 (51) to the tapered surface 12c of the left side wall 12 (tapered surface 13c of the right side wall 13) and the left end surface 34 (right end surface 35) of the boundary resistor plate 30. Is done. At this time, the left side wall 12 (the right side wall 13) is fixed between the front and rear walls 10 and 11, while the boundary resistance plate 30 is a movable state simply placed on the rear wall 11. Therefore, horizontal pressing forces that oppose (opposite) in the left-right direction act on the resistance plate 30 for the boundary. For this reason, the boundary resistance plate 30 is supported from below by the rear wall 11 and is held in a state of being sandwiched by the left side wall 12 and the right side wall 13 via the temporary fastening pieces 50 and 51, that is, temporarily. Stopped.

  Note that the left side wall 12 (right side wall 13) has at least a portion disposed in the left-right direction opposite to the left side end surface 34 (right side end surface 35) of the boundary resistor plate 30, and the left side end surface 34 (right side end surface 35). As long as the temporary fixing piece 50 (51) is installed horizontally, the resistance plate 30 for boundary may be formed so as to be sandwiched between the temporary fixing pieces 50 and 51, and is limited to the shape of this embodiment. Is not to be done.

  In this way, the boundary resistance plate 30 is temporarily fixed in a stable state via the temporary fixing pieces 50 and 51, so that, for example, the backhoe bucket as a work machine can be inserted into the insertion space S of each block A. When the filling chestnut D2 and the backfilling chestnut D3 are put into the back space Sb (the sixth step and the seventh step described later), the boundary resistance plate 30 becomes the filling chestnut D2 and the back Even if it receives an impact force from the built-in chestnut stone D3, it will not be displaced or fall over. Further, even if the temporary fixing piece 50 (51) is hit from below and the temporary fixing piece 50 (51) is pushed downward, the horizontal pressing force on the boundary resistance plate 30 is not reduced. The boundary resistance plate is increased so that it does not fall. Therefore, the conventional trouble that the operator must hold the boundary resistor plate 30 via the resistor plate positioning jig during the filling operation is eliminated.

  Further, when removing the temporary fixing pieces 50, 51, if a pushing force or a pulling force is applied to the temporary fixing pieces 50, 51 from below to above the temporary fixing pieces 50, 51, a vertical plane boundary resistance is obtained. The temporary fixing piece 50, via the taper surface 12c of the left side wall 12 (taper surface 13c of the right side wall 13) whose distance from the left side end surface (right side end surface) of the plate 30 is gradually enlarged from below to above. 51 can be easily removed and the temporarily fixed state can be easily released. In this way, the remaining filling space S, outer space Ss, and rear space Sb are filled with the filling padding D2 and the backfilling material D3 to the upper end of the block A while removing the temporary fixing pieces 50 and 51. can do.

  In the retaining wall Y configured as described above, the base resistor plate 20 is disposed between the base portion B and the lowermost block A mounted thereon, and the base resistor plate 20 lowers the lowermost step. The sliding resistance of the block A is strengthened. Then, a boundary resistor plate 30 is disposed between the second block A stacked on the lowermost block A, and the sliding resistance of the second block A is reduced by the boundary resistor plate 30. Strengthen the power. Similarly, a boundary resistor plate 30 is disposed between each of the blocks A and A stacked adjacent to each other in the vertical direction, so that each upper block A is connected to each lower step by the boundary resistor plate 30. The sliding resistance against the block A is strengthened. That is, the basic resistor plate 20 and each boundary resistor plate 30 fulfill the function of strengthening the sliding resistance of the block A at each stage via a lump such as the basic chestnut stone D1 or the filling chestnut stone D2. Yes. In addition, the function which strengthens the sliding resistance of the block A which the basic resistance board 20 and each resistance board 30 have is the same as the function of the sliding resistor disclosed in Japanese Patent No. 5309295.

  The retaining wall Y of the first embodiment is provided with a foundation resistance plate 20 that performs a sliding prevention function in a filling layer 23 formed by filling the chestnut stone D1 for foundation, and is filled inside each block A. This is an empty block retaining wall in which a boundary resistance plate 30 that performs a function of preventing sliding is disposed in a layer formed by filling the chestnut stone D2.

[Description of Retaining Wall Construction Method According to First Example]
Next, the construction method of the retaining wall Y according to the first embodiment will be described with reference to FIGS. The construction method of the retaining wall Y according to the first embodiment is a construction method including the first step to the seventh step, and is specifically as follows.

  A 1st process is a process of constructing the base part B, as shown in FIG. In the first step, the groove groove Br along the retaining wall extending direction is formed in the ground of the river bed K1, the bottom layer 24 is formed at the bottom in the groove groove Br, and the foundation layer 24 is formed on the bottom layer 24. The base plate B for constructing the retaining wall Y is constructed by arranging the resistance plate 20 and filling the grooved portion Br with the foundation chestnut D1 to form the filling layer 23.

  The second step is a step of laying a plurality of first-stage blocks A along the retaining wall extending direction on the base portion B as shown in FIG. In the second step, for example, the middle part of the wire 63 of the lifting hardware set 60 is attached to the bucket provided at the tip of the lifting / lowering function part of the backhoe as a work machine, and is lifted to the mounting holes 18 and 19 of the block A. The fixtures 61 and 61 of the hardware set 60 are attached, and the block A is lifted and suspended via the lifting hardware set 60 by the lifting / lowering function unit, and the block is placed on the filling layer 23 arranged in the first step. A is disposed. At this time, the first-stage block A is arranged so as to surround the upper portion of the basic resistor plate 20 protruding from the filling layer 23.

  As shown in FIG. 13, the third step is a step of placing a pair of left and right raising bases 40, 40 at predetermined positions on the rear wall 11 of each arranged first block A. In the first embodiment, the lower left and right sides of the boundary resistor plate 30 are placed on the rear wall 11 in a erected manner via a pair of left and right raised bases 40, 40.

  As shown in FIG. 14, the fourth step is a step of placing the boundary resistance plate 30 on the pair of left and right raising bases 40, 40 placed on the rear wall 11 of the block A in the third step. It is. In the fourth step, the fixtures 61 and 61 of the lifting hardware set 60 attached to the attachment holes 18 and 19 of the block A are attached to the resistance plate attachment holes 32 and 33 of the boundary resistor plate 30, and the backhoe The boundary resistor plate 30 is lifted and hung by the lifting / lowering function unit, so that the boundary resistor plate 30 is placed on the center portion on the rear wall 11 of the block A via the pair of left and right raised bases 40 and 40. The The boundary resistor plate 30 is placed on the rear wall 11 via the pair of left and right raised bases 40, 40, so that the boundary resistor plate 30 is simultaneously disposed at the predetermined position.

  As shown in FIG. 15, the fifth step consists of the left and right end faces 34 and 35 of the boundary resistor plate 30 arranged at a predetermined position, and the left and right walls 12 and 13 of the block A facing them. This is a step of temporarily fixing the boundary resistance plate 30 with a pair of left and right temporary fixing pieces 50 and 51 interposed in a horizontal manner. In the fifth step, when the boundary resistor plate 30 is temporarily fixed, the upper portions of the tapered surfaces 12c and 13c of the left and right walls 12 and 13 and the middle portions of the left and right end surfaces 34 and 35 of the boundary resistor plate 30 A pair of left and right temporary fixing pieces 50 and 51 are interposed horizontally between each other, and at least one of the temporary fixing pieces 50 (51) is pushed downward. The boundary resistance plate 30 is temporarily fixed on the rear wall 11 by applying a horizontal force relative to the right side end surfaces 34 and 35.

  In the sixth step, as shown in FIG. 16, the filling crushed stone D2 is placed in the inside space S of the block A in which the boundary resistance plate 30 is temporarily fixed and in the outer space Ss thereof, and the space behind the block A. This is a step of filling back filling Kuriishi D3 in Sb. In the sixth step, the lifting hardware set 60 is removed from the bucket of the backhoe where the boundary resistor plate 30 is lifted and hung. The inside of the block A filling space S and the outside space Ss of the block A are filled by the bucket provided on the backhoe, and the back filling Kuriishi D3 is put into the back space Sb of the block A. Then fill. At this time, since the boundary resistance plate 30 is temporarily fixed in a stable state, even if it is affected by the impact force or pressing force from the filling crushed stone D2 or the backfilling crushed stone D3, it can be easily obtained. There will be no falls. In the first embodiment, in order to improve the workability of the filling work, a common chestnut stone is used as the filling crushed stone D2 and the backfilling crushed stone D3.

  In the sixth step, the filling level of the chestnut D2 for filling is set up to the upper end surface of the block, and in the middle of this filling operation, the pair of temporary fixing pieces 50, 51 temporarily fixed are pulled upward, or The temporary fixing is released by pushing up and removing it. Specifically, the back-filling chestnut D3 in the area corresponding to the rear surface and the front surface of the boundary resistor plate 30 is inserted, and then the filling-up chestnut stone D2 is inserted, and these chestnut stones D2 and D3 are placed upright. After the posture of the placed resistance plate 30 is stabilized, the temporary fixing pieces 50 and 51 are struck with a hammer from below to remove the temporary fixing pieces 50 and 51.

  At this time, the inner surfaces of the left and right side walls of the block have a tapered surface 12c of the left side wall 12 (tapered surface 13c of the right side wall 13) gradually expanding from the lower side to the upper side. When the stopper pieces 50 and 51 are hit, they are easily removed, and the temporary stopper is released at this moment.

  In the seventh step, the temporary fixing by the temporary fixing pieces 50 and 51 is released, and the filling crushed stone D2 and backfilling crushed stone D3 filled up to the level of the upper end surface of each block A are used by a rammer (not shown) or the like. This is a compacting process. FIG. 17 shows a state after the filling chestnut D2 and backfilling chestnut D3 filled to the level of the upper end surface of the block A are compacted.

  In the construction method of the retaining wall Y according to the first embodiment, the first-stage block A is laid on the base part B through the first to seventh steps described above, and the filling chestnut D2 and back filling The desired height is obtained by sequentially repeating the second to seventh steps to the required number of blocks A on each block A of the first step on which the chestnut stone D3 is compacted. This is a construction method in which the retaining wall Y is constructed along the slope of the hinterland. However, in the second step of the second stage, the second stage block A is stacked stepwise on the placed first stage block A. An upper portion of the boundary resistor plate 30 supported by the rear wall 11 of the first-stage block A is disposed in the storage space S in a state of being inserted from below.

  In the construction method of the retaining wall Y configured as described above, a block A is attached to a single work machine, for example, a bucket of a backhoe via a lifting hardware set 60, and the block A is lifted and suspended by the backhoe. Work to lay. Subsequently, the boundary back plate 30 is lifted and hung by the same backhoe through the lifting hardware set 60 and continuously laid. Then, the boundary resistance plate 30 is temporarily fixed via the pair of left and right temporary fixing pieces 50 and 51. By doing so, after that, the lifting hardware set 60 is removed from the bucket of the same backhoe, and it is common in the inside space S of the block A and in the outer space Ss thereof and in the back space Sb of the block A. The work of filling the chestnut with the bucket can be performed at once. Therefore, it is not necessary to attach / remove the lifting hardware set 60 to / from the same backhoe in the middle of the work of filling the filling material as in the prior art, and the lifting hardware set 60 is attached / detached. And the filling work of filling the chestnut can be halved, and the construction time can be shortened and the construction cost can be reduced.

[Description of Structure of Auxiliary Locking Body in First Embodiment]
In the first embodiment configured as described above, as shown in FIG. 19, the front wall 10 and the boundary resistor plate 30 temporarily fixed to the left and right walls 12 and 13 by temporary fixing pieces 50 and 51. An auxiliary temporary fixing member 70 can be detachably provided therebetween. Further, the auxiliary temporary fixing body 70 can reinforce the temporarily fixed state of the boundary resistance plate 30 temporarily fixed to the left and right side walls 12 and 13.

  The auxiliary temporary fixing body 70 is engaged with the upper end portion of the front wall 10 from above, and the rear extending from the front engagement piece 71 to the front surface 30a of the boundary resistance plate 30 rearward. An extending piece 72 and an abutting piece 73 provided at the rear end portion of the backward extending piece 72 and abutting against the front surface 30a of the boundary resistance plate 30 are provided.

  The front engaging piece 71 is formed by notching the lower half of the tip portion into a stepped concave shape. In the front engaging piece 71, a lower surface 71a and a rear surface 71b are arranged in an orthogonal state. Then, the lower surface 71a of the front engagement piece 71 is brought into contact with the upper end surface 10a of the front wall 10 and the rear surface 71b of the front engagement piece 71 is brought into contact with the upper rear surface of the front wall 10 to The front engaging piece 71 can be engaged and disengaged from above at the upper end portion of the head.

  The rearward extending piece 72 is formed in a rectangular bar shape that extends straight from the rear end portion of the front engaging piece 71 toward the rear.

  The contact piece 73 is formed in a shape that can contact the front surface 30 a of the boundary resistor plate 30. In the present embodiment, it is formed in a rectangular bar shape that extends straight in the vertical direction, and a midway portion on the front surface of the contact piece 73 is connected to the rear end portion of the rearward extending piece 72 in a straight state. The rear surface 73a of the contact piece 73 is in surface contact with the front surface 30a. In addition, the shape of the contact piece 73 should just be a shape which contact | abuts or surface-contacts the front surface 30a, for example, can also be formed in a disk shape.

  In the auxiliary temporary fixing body 70 configured in this manner, the front engagement piece 71 is engaged with the upper end of the front wall 10 from above, while the boundary resistance plate 30 is temporarily fixed by the temporary fixation pieces 50 and 51. By bringing the contact piece 73 of the auxiliary temporary fixing body 70 into contact with the front surface 30a, the auxiliary temporary fixing body 70 can be installed horizontally between the front wall 10 and the boundary resistance plate 30. . By doing so, it is possible to reliably prevent the filling material or the like from striking the boundary resistance plate 30 when the filling material is charged, and the boundary resistance plate 30 from moving and falling and falling from the rear wall. Therefore, it is possible to fill the backfilling chestnut D3 first from the back space Sb, and then fill the insidefilling space S with the filling chestnut D2 to improve the filling work efficiency. In addition, after the filling work of the chestnut D2 for filling, the auxiliary temporary fixing body 70 can be easily removed by lifting the auxiliary temporary fixing body 70 upward, and the removed auxiliary temporary fixing body 70 is removed during the filling operation to the adjacent block A. Can be reused.

[Description of Modification of Temporary Fixing Piece of First Embodiment]
As a modification of the temporary fixing piece of the first embodiment, a temporary fixing body 80 is shown in FIG. As shown in FIG. 20, the temporary fixing body 80 includes a horizontal piece 81 and a fitting piece 82. The horizontal piece 81 is formed in a quadrangular bar shape extending straight in the left-right direction. The horizontal width of the horizontal piece 81 is formed such that it can be interposed horizontally between the upper portions of the left and right walls 12 and 13.

  A fitting piece 82 is erected in the middle of the upper surface of the horizontal piece 81. The fitting piece 82 is formed of a support piece 83 formed by rising upward from a middle part of the upper surface of the horizontal piece 81, and a fitting piece 84 attached to the upper end portion of the support piece 83. The support piece 83 is formed in a quadrangular prism shape. The fitting main piece 84 includes a connecting piece 85 connected to the upper front portion of the support piece 83, an upper piece 86 extending horizontally rearward from the upper end edge of the connecting piece 85, and a rear end of the upper piece 86. A rear piece 87 that extends downward from the edge portion downward is formed into a side-view portal type. That is, the fitting piece 82 is formed in a hook shape that is open on the left and right sides by the support piece 83, the upper piece, and the rear piece 87.

  In the temporary fixing body 80 configured as described above, the upper portions of the tapered surfaces 12c and 13c of the left and right walls 12 and 13 are positioned immediately before the boundary resistor plate 30 placed upright on the rear wall 11. In the meantime, the horizontal piece 81 can be temporarily clamped between the tapered surfaces 12c and 13c by pushing the horizontal piece 81 into the horizontal shape. In the state where the horizontal piece 81 is temporarily fixed between the tapered surfaces 12c and 13c, the fitting piece 82 formed in a hook shape can be fitted to the middle portion of the upper end of the boundary resistance plate 30 from above. it can. Therefore, the fitting piece 82 can restrict the movement of the boundary resistor plate 30 in the front-rear direction, and can suppress the boundary resistor plate 30 from moving, falling, and dropping.

[Description of Structure of Temporary Fixing Body as Second Example]
FIG. 21 shows a temporary fixing body 90 as a second embodiment. As shown in FIG. 21, the temporary fixing body 90 lies horizontally between the upper end portion of the front wall 10 and the boundary resistance plate 30 placed upright on the rear wall 11. The resistance plate 30 can be temporarily fixed. Then, the backfilling chestnut D3 is filled first from the back space Sb, and then the insidefilling space S is filled with the filling chestnut D2, and the temporary fixing body 90 is removed upward in the filling work process, The temporary fixing of the resistance plate 30 can be released.

  The temporary fixing body 90 includes a front fitting piece 91, a temporary fixing book piece 92, and a rear fitting piece 93. The front fitting piece 91 is formed in a side-view portal shape that opens on the left and right sides and below, and can be fitted to the upper end of the front wall 10 from above. When the front fitting piece 91 is fitted to the upper end of the front wall 10 from above, the front wall 10 restricts the movement in the front-rear direction. The temporary fixing piece 92 is formed in a rectangular bar shape by extending straight from the rear end portion of the front fitting piece 91 to the rear. The rear fitting piece 93 is formed by a contact / support piece 94 that is formed in a rectangular bar shape by extending in the vertical direction, and a rear fitting main piece 95 attached to the upper end portion of the contact / support piece 94. . The abutting / supporting piece 94 has a front halfway portion connected to the rear end portion of the temporary fixing book piece 92 in an orthogonal state. The contact / support piece 94 is formed by extending in the front-rear direction so that the rear surface thereof is in surface contact with the front surface 30 a of the boundary resistor plate 30. The rear fitting main piece 95 includes a connecting piece 96 connected to the upper front portion of the contact / support piece 94, an upper piece 97 extending horizontally from the upper end edge of the connecting piece 96, and an upper piece. The rear piece 98 extends downward from the rear edge of 97, and is formed into a side-view portal type. That is, the rear fitting piece 93 is formed in a hook shape that is open on the left and right sides by the contact / support piece 94, the upper piece 97, and the rear piece 98. Then, the rear fitting piece 93 is fitted to the upper end portion of the boundary resistor plate 30 from above, thereby restricting the movement of the boundary resistor plate 30 in the front-rear direction.

  In the temporary fixing body 90 configured as described above, the front fitting piece 91 is fitted to the upper end portion of the front wall 10 from above, while the rear fitting piece 93 is fitted to the upper end portion of the boundary resistance plate 30 from above. By combining, the rear surface of the contact / support piece 94 comes into surface contact with the front surface 30 a of the boundary resistor plate 30, and the boundary resistor plate 30 can be temporarily fixed to the front wall 10. That is, the temporary fixing body 90 can restrict the movement of the boundary resistor plate 30 in the front-rear direction, and can suppress the movement, overturning, and dropping of the boundary resistor plate 30. Then, the backfilling chestnut stone D3 is filled first from the back space Sb, and then the insidefilling space S is filled with the chestnut filling stone D2, and the temporary resistance plate 30 for the boundary is easily installed in this filling work process. The stop can be released.

  In addition, the temporary fixing body 90 of the second embodiment is used in combination with the locking pieces 50 and 51 of the first embodiment to temporarily attach the boundary resistance plate 30 placed on the rear wall 11 in a vertically-arranged manner. It can also be stopped. That is, when the combined use of the temporary fixing body 90 and the locking pieces 50 and 51 temporarily secures the boundary resistance plate 30, the temporary fixing body 90 and the locking pieces 50 and 51 are used in combination. Thus, the workability can be further improved.

[Description of Structure of Temporary Fixing Body as Third Example]
The temporary fixing body 100 as 3rd Example is shown in FIGS. As shown in FIGS. 22 to 24, the temporary fixing body 100 is interposed between the rear wall 11 and the boundary resistance plate 30 placed vertically on the rear wall 11, and The boundary resistor plate 30 is temporarily fixed to the wall 11. In the third embodiment, the boundary resistor plate 30 is placed directly on the upper end surface of the rear wall 11, and the boundary resistor plate 30 is brought into a stable state without using the pair of left and right raised bases 40, 40. It can be placed. The temporary fixing body 100 includes a temporary fixing pin 110 as a temporary fixing piece, and upper and lower pin holders 130 and 140 for preventing and holding upper and lower ends of the temporary fixing pin 110, respectively. The temporary fixing pin 110 is displaced between the contact surfaces of the rear wall 11 and the boundary resistor plate 30 due to earth pressure acting on the rear wall 11 and the boundary resistor plate 30 from behind, and the displacement is aligned. The central portion to be sheared is broken so that the temporary fixing of the boundary resistance plate 30 to the rear wall 11 is released. This earth pressure is filled with the filling chestnut D2 in the filling space S, and after filling the back space Sb with the filling chestnut D3, the back wall 11 and the boundary resistor plate 30 are placed on the back side from the river bank K3 side. It works.

  More specifically, the temporary fixing pin 110 is formed in a straight bar shape with a circular cross-section with the axis line in the vertical direction, and the upper half 112 and the lower half 114 are symmetrical with respect to the vertical line. The upper half part 112 (lower half part 114) has a lower end part 116 (upper end part 118) formed in a large-diameter truncated cone shape, and an upper half middle part 120 (lower half middle part 121) having a smaller diameter than the lower end part. It is formed in a columnar shape, is formed in a truncated cone shape in which the upper portion 122 (lower portion 124) is gradually reduced in diameter upward, and the upper end portion 126 (lower end portion 128) is formed in an umbrella shape projecting outward. As for the temporary fixing pin 110, the cross-sectional area of the center part (connection surface of the upper half part 112 and the lower half part 114) shear-fracted substantially horizontally and the rigidity of the material which forms the temporary fixing pin 110 are suitably adopted. Thus, the required allowable shear force can be set.

  The upper and lower pin holders 130 and 140 are formed in the same shape. The upper pin holder 130 (lower pin holder 140) is fitted into a cylindrical upper holder piece 132 (lower holder piece 142) and an upper end portion (lower end portion) of the upper holder piece 132 (lower holder piece 142). And a cap-like upper closing piece 134 (lower closing piece 144) that closes the upper end (lower end). On the inner peripheral surface of the upper holder main piece 132 (lower holder main piece 142), a plurality (four in the present embodiment) of upper elastic locking pieces 136 (lower elastic locking) are directed from the midway portion to the upper side inside. The piece 146) protrudes. The inner diameter of the lower half of the inner peripheral surface (upper half of the inner peripheral surface) of the upper holder main piece 132 (lower holder main piece 142) is substantially the same as the outer diameter of the midway portion 112 (midway portion 113) of the temporary fixing pin 110. Is formed.

  The upper elastic locking piece 136 (lower elastic locking piece 146) formed in this way is inserted so that the upper end portion 118 (lower end portion 120) of the temporary fixing pin 110 is directed downward (upper) to upper (lower). At that time, it is elastically deformed outwardly in a diameter-enlarged shape. Subsequently, when the upper end portion 118 (lower end portion 120) is inserted upward (downward) from the upper elastic locking piece 136 (lower elastic locking piece 146), it is elastically deformed in a reduced diameter inward. At the same time, the lower surface periphery (upper surface periphery) of the upper end 118 (lower end 120) is locked from below (upper). As a result, the upper end portion 118 (lower end portion 120) of the temporary fixing pin 110 is retained and held by the upper elastic locking piece 136 (lower elastic locking piece 146) of the upper pin holder 130 (lower pin holder 140).

  An upper pin insertion recess 150 having a lower surface opening is formed in the lower center portion of the boundary resistor plate 30 so as to extend upward. An upper pin holder 130 is arranged in a fixed state in the upper part of the upper pin insertion recess 150. Further, a lower pin insertion recess 160 on the upper surface opening is formed in a concave shape extending downward in the center upper portion of the rear wall 11. A lower pin holder 140 is disposed in a fixed state at a lower portion in the lower pin insertion recess 160. The upper pin insertion recess 150 and the lower pin insertion recess 160 are formed so as to coincide with each other in the vertical direction.

  When the boundary resistor plate 30 is placed on the rear wall 11, the lower half portion 114 of the temporary fixing pin 110 is inserted into the lower pin insertion recess 160 formed in the upper portion of the rear wall 11 in advance. The upper half 112 of the temporary fixing pin 110 is protruded upward. At this time, the lower end portion 120 of the temporary fixing pin 110 is retained and held by the lower elastic locking piece 146 of the lower pin holder 140.

  Then, the upper pin insertion recess 150 formed in the boundary resistor plate 30 and the upper end portion 118 of the temporary fixing pin 110 formed with the axis line in the vertical direction are aligned in the vertical direction, and the By lowering the boundary resistor plate 30, the upper half 102 of the temporary fixing pin 110 is inserted into the upper pin insertion recess 150, and the boundary resistor plate 30 is placed on the rear wall 11. In this manner, the boundary resistance plate 30 is temporarily fixed on the rear wall 11 via the temporary fixing pins 110. At this time, the upper end portion 118 of the temporary fixing pin 110 is retained and held by the upper elastic locking piece 136 of the upper pin holder 130.

  Further, the upper half 112 of the temporary fixing pin 110 is inserted into the upper pin insertion concave portion 150 of the boundary resistor plate 30 in advance, and the temporary fixing pin 110 is inserted into the lower pin insertion concave portion 160 of the rear wall 11. The boundary resistor plate 30 is temporarily fixed on the rear wall 11 via the temporary fixing pins 110 by inserting the lower half portion 114 and placing the boundary resistor plate 30 on the rear wall 11. You can also make it.

  If a shearing force greater than the allowable shear force acts on the central portion of the temporary fixing pin 110 that temporarily fixes the rear wall 11 and the boundary resistance plate 30 due to earth pressure acting from behind, the center of the temporary fixing pin 110 The part is sheared and the temporary resistance of the boundary resistance plate 30 is released. As a result, the boundary resistor plate 30 and the block A are individually displaced to exert a passive earth pressure on the front surface of the boundary resistor plate 30, and this passive earth pressure is propagated to the inner surface (front surface) of the rear wall 11. Thus, the sliding resistance of the block A is strengthened. Therefore, as described above, the construction method of the retaining wall Y according to the third embodiment includes the first to fifth steps and the seventh step of the first embodiment, but the temporary fixing is artificially released. There is no need to include the sixth step.

A block B foundation part Y retaining wall S insert space 10 front wall 11 rear wall 12 left side wall 13 right side wall 20 resistance plate for foundation 30 resistance plate for boundary 50 left temporary fixing piece 51 right temporary fixing piece

Claims (7)

A block that has front, rear, left, and right side walls, and the height of the rear wall is lower than the height of the front wall is laid and stacked along the extending direction.
In the stacked blocks, the sliding resistance plate is placed in a state separated from the block, straddling the upper and lower boundaries, and the inside / outside space of the block is filled with backfill material Filling
Due to the action of earth pressure, the block and the sliding resistance plate are individually displaced, and a passive earth pressure is generated on the front side of the sliding resistance plate, and this passive earth pressure acts as a filling material between the sliding resistance plate and the rear wall. It is propagated to the inner surface of the rear wall through the construction method of the empty loading retaining wall block in which the sliding resistance of the block is strengthened,
The sliding resistance plate is placed upright on the rear wall, and the sliding resistance plate is temporarily fixed to the block so that the sliding resistance plate does not move, fall or fall.
In addition, the sliding resistance plate temporarily fixed can be released by releasing temporary fixing in the work process of filling the inside / outside space of the block with the filling material / backfill material or by earth pressure acting after the filling work. A method for constructing an empty retaining wall block in which a sliding resistance plate is installed, wherein the temporary fixing is released and the block is restored to a state separated from the block. The sliding resistance plate placed upright on the rear wall is temporarily fixed to the left and right walls of the block.
The empty retaining wall in which the sliding resistance plate is installed according to claim 1, wherein the inner and outer spaces of the block are filled with filling material and backfilling material, and the temporary fixing of the sliding resistance plate is released. Block construction method. The inner surfaces of the left and right side walls are tapered inward and down,
A pair of left and right temporary fastening pieces are interposed horizontally between the taper surface of the left and right side walls and the left and right end surfaces of the sliding resistance plate, thereby facing the left and right side end surfaces of the sliding resistance plate. 3. The construction method for an empty retaining wall block provided with the sliding resistance plate according to claim 2, wherein a horizontal force is applied to temporarily fix the sliding resistance plate to the left and right side walls. The sliding resistance plate placed upright on the rear wall is temporarily fixed to the front wall of the block.
The empty retaining wall in which the sliding resistance plate is installed according to claim 1, wherein the inner and outer spaces of the block are filled with filling material and backfilling material, and the temporary fixing of the sliding resistance plate is released. Block construction method. Between the upper end of the front wall and the upper end of the sliding resistance plate, a temporary fixing body is detachably mounted,
The temporary fixing body includes a front fitting piece that is fitted to the upper end portion of the front wall from above and the movement in the front-rear direction is restricted by the front wall, and a temporary fixing book that extends rearward from the front fitting piece. And a rear fitting piece that is provided at the rear end portion of the temporary fixing book piece and is fitted to the upper end portion of the sliding resistance plate from above to restrict the movement of the anti-sliding plate in the front-rear direction. The construction method of the empty stacked retaining wall block in which the sliding resistance plate according to claim 4 is installed. The sliding resistance plate placed upright on the rear wall is temporarily fixed to the rear wall of the block,
2. The sliding according to claim 1, wherein the inner and outer spaces of the block are filled with a filling material and a backfilling material, and temporary fixing is released by earth pressure acting after the filling operation. Construction method for empty loading retaining wall block with resistance plate. On the upper part of the rear wall, while forming a lower pin insertion recess on the top opening,
In the lower part of the sliding resistance plate, an upper pin insertion concave portion of a lower surface opening that coincides with the lower pin insertion concave portion in the vertical direction is formed,
When placing the sliding resistance plate on the rear wall, the upper pin insertion recess formed in the sliding resistance plate is inserted into the upper pin insertion concave portion formed in a pin shape with the axis line directed vertically, The lower part of the temporary fixing pin is inserted into the lower pin insertion recess formed in the upper part of the rear wall, and temporarily fixed.
8. The sliding resistance plate according to claim 7, wherein the temporary fixing pin is sheared by earth pressure acting on the block and the sliding resistance plate so that the temporary fixing of the sliding resistance plate is released. How to build an empty retaining wall block.

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