JP2000073383A - Block for retaining wall and form device for block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure prescribed yield strength by providing through holes penetrating in the vertical direction on a buttress, providing stepped expansion sections on the inner peripheral face of each through hole, and providing a node-like space in the through hole. SOLUTION: A pair of right and left buttresses 6 is extended backward from the rear face of a front wall 5 to form a block main body 3. Oblong reinforcing bar insertion holes 4 extending in the longitudinal direction on the plan view are formed on each buttress 6. Three stepped expansion sections 4a are formed at intervals in the vertical direction on the inner peripheral face of each reinforcing bar insertion hole 4, and a node-like space 7 is formed in each reinforcing bar insertion hole 4 to form a block B for a retaining wall. At the time of execution, the blocks B are stacked to construct the retaining wall, concrete is filled and reinforcing bars are inserted into the reinforcing bar insertion holes 4 matched in the vertical direction, and a reinforced concrete column is formed in the reinforcing bar insertion holes 4. The reinforced concrete column can be integrated with a main body 3 by three node-like sections, thus prescribed yield strength can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall block and a formwork device for the block.

[0002]

2. Description of the Related Art Conventionally, as one form of a retaining wall block,
There is a front wall and a stay wall extending rearward from a rear surface of the front wall, and a through hole is formed in the stay wall in a vertical direction.

[0003] The inner peripheral surface of the through-hole has a draft angle to the core for forming the through-hole. Therefore, when the core is pulled out from one end of the block main body, the inner peripheral surface of the through-hole is formed from one end of the through-hole. Formed on a tapered surface that gradually decreases in diameter toward the other end, or in a form in which the core divided into two pieces is pulled out from both ends of the block body, the diameter is gradually reduced from both ends of the through hole toward the center. It is formed on a tapered surface.

When a retaining wall is constructed with the retaining wall block described above, the retaining wall block is stacked on the retaining wall construction site, and a connecting hole is formed as necessary in a through hole that coincides with the vertical direction. The rebar is inserted.

[0005]

However, in the above-described retaining wall block, since the inner peripheral surface of the through hole is merely formed as a tapered surface, the retaining wall may be subjected to earth pressure or the like from behind. In response to seismic forces acting from the front side to the rear side of the retaining wall during an earthquake, the reinforced concrete columns formed in the through-holes slide upward and downward by receiving force, and the retaining wall is integrated. There is a problem that a predetermined strength cannot be secured because the structure does not function.

[0006]

Therefore, according to the present invention, a front wall and a stay wall extending rearward from the rear surface of the front wall are provided, and a through hole vertically penetrating through the stay wall is formed in the stay wall. A retaining wall block characterized in that a stepped enlarged portion is formed on the inner peripheral surface of the through hole to form a nodal space in the through hole. It is.

Further, the present invention is provided with a mold body for forming a block body and a core for forming a through hole, and the core is used for forming an inner peripheral surface of an inner peripheral surface of the through hole. Core forming body, and a supporting core forming body for supporting the inner circumferential surface forming core forming body, wherein the inner circumferential surface forming core forming body is a cylindrical formed body made of an elastic material. And a protruding ridge for forming a stepped enlarged-diameter portion integrally formed along the outer peripheral surface of the formed body, and the supporting core formed body expands and contracts in the circumferential direction of the through hole. It is an object of the present invention to provide a mold device characterized by being freely formed.

[0008]

Embodiments of the present invention will be described below.

That is, the retaining wall block according to the present invention comprises, as a basic structure, a front wall and a stay wall extending rearward from the rear surface of the front wall, and penetrates the stay wall vertically. Is formed.

The retaining wall block is characterized by forming a stepped enlarged portion on the inner peripheral surface of the through hole as a characteristic structure.
A nodular space is formed in the through hole.

When concrete is poured into the through-hole in this way, the nodular space is also filled with concrete to form a concrete column having a nodal portion in the through-hole. The part makes it possible to reliably integrate the concrete pillar into the block body.

Therefore, a reinforced concrete column is usually rigid as a rigid body against a positive bending moment generated by an external force such as earth pressure acting from the rear surface (back surface) to the front surface (front surface) of the retaining wall from the rear surface (back surface). On the other hand, in the event of an earthquake, a negative bending moment caused by seismic force acting from the front side to the rear side of the retaining wall during an earthquake, as in normal times, The resistance as a rigid body can be exhibited.

As a result, despite the upward or downward force acting on the reinforced concrete column, the reinforced concrete column functions as an integral structure with the block main body and does not slide, and the reinforced concrete column does not slide on the built retaining wall. Proof stress can be maintained.

[0014] The formwork device for a retaining wall block described above is provided with a formwork body for forming the block body and a core for forming the through hole, and the core has an inner peripheral surface of the through hole. An inner peripheral surface forming core forming body to be molded, and a supporting core forming body for supporting the inner peripheral surface forming core forming body, the inner peripheral surface forming core forming body is an elastic material. The main body is formed from a cylindrical formed body composed of a cylindrical body and a protruding ridge for forming a stepped enlarged diameter portion integrally formed along the outer peripheral surface of the formed body. Are formed so as to be expandable and contractible in the circumferential direction.

[0015] In this manner, the stepped enlarged portion can be reliably formed on the inner peripheral surface of the through hole of the retaining wall block.

At this time, since the core for forming the through hole can be expanded and contracted in the circumferential direction of the through hole, the assembling work of the formwork apparatus and the removing work of the retaining wall block can be easily performed. be able to.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

A shown in FIGS. 1 to 3 is a formwork apparatus according to the present invention. The formwork apparatus A includes a formwork body 1 for forming a block body 3 of a retaining wall block B shown in FIG. And a core 2 for forming a reinforcing-bar insertion hole 4 as a through-hole.

First, the retaining wall block B will be described. As shown in FIGS. 9 and 10, the retaining wall block B extends rearward from the front wall 5 and the rear surface of the front wall 5. The block main body 3 is formed from the pair of left and right retaining walls 6, 6, and each of the retaining walls 6, 6 has an oval reinforcing bar insertion hole 4, 4, 4, 4 extending in the front-rear direction in plan view. Has formed.

In addition, three stepped enlarged portions 4a, 4a, 4a are formed on the inner peripheral surface of each rebar insertion hole 4 at intervals in the up-down direction, and a joint is formed in each rebar insertion hole 4. A space 7,7,7 is formed.

In this way, as shown in FIG. 10, the retaining wall blocks B are stacked to form a retaining wall Y, and concrete (or mortar) is inserted into the reinforcing bar insertion holes 4 and 4 that match in the vertical direction. ) And, if necessary, a reinforcing bar for connection (not shown) is inserted so that
Reinforced concrete columns 8, 8 can be formed therein.

At this time, in the reinforced concrete column 8, three node-like portions 8a, 8a, 8a are formed at intervals in the vertical direction by concrete filled in the node-like spaces 7, 7, 7, The reinforced concrete columns 8 can be surely integrated with the block body 3 by the knots 8a.

Therefore, the reinforced concrete column 8 normally receives a positive bending moment caused by an external force such as earth pressure acting from the rear surface (back surface) to the front surface (front surface) of the retaining wall Y from the rear surface (back surface). While it can exert its resistance as a rigid body, in the event of an earthquake, it will also be able to withstand the negative bending moment caused by seismic force acting from the front side to the rear side of the retaining wall, etc. Similarly, the resistance as a rigid body can be exhibited.

As a result, despite the upward or downward force P acting on the reinforced concrete column 8, the reinforced concrete column 8 functions as an integral structure with the block body 3 and is constructed without sliding. The retaining wall Y can have a predetermined strength.

Next, the mold body 1 and the core 2 constituting the mold apparatus B will be described in detail with reference to FIGS.

The mold body 1 is, as shown in FIGS.
Front face forming part 10, a pair of front and rear end face forming parts 11, 11 whose lower ends are pivotally supported at front and rear side edges of the front face forming part 10, and lower ends pivotally supported at left and right side edges of front forming part 10, respectively. A pair of left and right outer surface forming portions 12 and 12, a U-shaped inner surface forming portion 13 extending between the middle portions of the end surface forming portions 11 and 11, and a connecting tool for connecting the opposed end surface forming portions 11 and 11. 14,14,14,14. 11a and 12a are pivot pins, 13a is a wire connecting ring, 16 is an elevating means, and 17 is a connecting wire.

The four upper and lower left and right sides of the pair of front and rear end face forming portions 11 are respectively provided with four oval core insertion holes 1.
5,15,15,15 and each core insertion hole 15,15,15,
At the peripheral edge of No. 15, guiding projections 15a, 15a, 15a, 15a are provided so as to protrude forward and backward.

As described above, the mold body 1 has the front face forming part 10 as a base, and the pair of front and rear end face forming parts 11, 11 is respectively erected around the pivot pins 11 a, 11 a. The upper and lower outer surface forming portions 12 and 12 are vertically movable between a forming position and a demolding position inclined forward and rearward and outward.
Can be turned up and down between a form forming position where it is erected around the pivot pins 12a and 12a and a demolding position where it is laid down to the left and right sides. The elevating means 16 can be moved up and down between a mold forming position and a demolding position via a connecting wire 17 connected between the connecting rings 13a, 13a.

As shown in FIGS. 4 to 7, the core 2 has a pair of arc-shaped core forming bodies 20 and 20 for forming the arc-shaped surfaces b1 and b1 of the rebar insertion hole b, and the rebar insertion hole b. And a pair of core forming bodies 21, 21 for forming a linear surface, which form the straight surfaces b2, b2, and core forming bodies 20, 20, 21, 21 as these supporting core forming bodies. And an inner peripheral surface forming core forming body 22 that forms the inner peripheral surface of the reinforcing bar insertion hole b.

The arc-shaped surface forming core forming body 20 includes a cylindrical body 20a made of a flexible material, a tip closing body 20b for closing the tip of the cylindrical body 20a, and a tip closing body 20b. It is composed of a locking ring 20c attached, a proximal closing body 20d for closing the proximal end of the cylindrical body 20a, and a supply / exhaust plug 20e provided on the proximal closing body 20d.

In addition, the front-rear width of the cylindrical body 20a is formed longer than the front-rear interval of the pair of front and rear end face forming portions 11,11.

The core forming body 21 for forming a straight surface is composed of a horizontally long rectangular plate-shaped forming body 21a and reinforcing and supporting projections 21b projecting perpendicularly to the upper and lower portions of the inner surface of the forming body 21a. , 21b. 21c is a locking hole.

Further, the front-rear width of the core forming body 21 for forming a straight surface is formed longer than the front-rear spacing of the pair of front-rear end face forming portions 11,11.

The inner core forming body 22 is formed of a cylindrical main body 22a made of an elastic rubber material and a stepped enlarged portion integrally formed along the outer peripheral surface of the main body 22a. And a convex ridge 22b for formation, and three convex ridges 22b are formed at intervals in the axial direction of the main body 22a.

In addition, the inner peripheral surface forming core forming body 22
Are formed so as to be able to penetrate in a transverse state along the inner peripheral surfaces of the core insertion holes 15, 15 formed so as to face the pair of front and rear end surface forming portions 11, 11, respectively. 22c is a locking piece.

Next, the procedure for assembling the core 2 will be described with reference to FIG.

As shown in FIG. 8A, the retracting tool 30 is inserted from the right side to the left side into the opposed core insertion holes 15, 15, and a hook 30 a formed at the tip of the retracting tool 30 is formed.
Is locked to the locking piece 22a of the inner peripheral surface forming core forming body 22, and in this state, the retracting tool 30 is pulled rightward.

As shown in FIG. 8B, the core forming body 22 for forming an inner peripheral surface is drawn into the facing core insertion holes 15, 15 to be in a horizontal state.

As shown in FIG. 8C, the retracting device 30 is inserted into the inner peripheral surface forming core forming body 22 from the right side to the left side, and the hook 30a of the retracting device 30 is arced. The retracting tool 30 is locked to the locking ring 20c of the surface forming core forming body 20, and the retraction tool 30 is pulled rightward in the same state.

As shown in FIG. 8D, the arc-shaped surface forming core forming body 20 is drawn into the inner peripheral surface forming core forming body 22 to be in a horizontal state.

Here, air is supplied in advance within the range of 60% to 80% into the arc-shaped surface forming core forming body 20 to form the arc-shaped surface forming core forming body 20 into a rod shape. .

As shown in FIG. 8D, subsequently, the retracting device 30 is inserted into the inner peripheral surface forming core forming body 22 from the right side to the left side, and the hook of the retracting device 30 is hooked. 30a is locked in the locking hole 21c of the core forming body 21 for straight surface forming, and in this state, the retracting tool 30 is pulled rightward.

As shown in FIG. 8E, a pair of right and left straight surface forming core forming bodies 21 and 21 are arranged on the arcuate surface forming core forming body 22 so as to face each other.

As shown in FIG. 8 (e), another arc-shaped surface forming core forming member 22 is inserted between the upper portions of the straight surface forming core forming members 21, 21 arranged in the facing state. Retract by 30.

In this case, air is supplied in advance within the range of 60% to 80% into the arc-shaped surface forming core forming body 20 to form the arc-shaped surface forming core forming body 20 into a rod shape. .

As shown in FIG. 8F, in the inner core forming body 22, a pair of arc-shaped core forming bodies 20, 20 are vertically arranged to face each other, and a pair of straight cores are formed. The core forming bodies 21, 21 are formed to face each other on the left and right, and in this state, the supply / exhaust plugs 20 of the core forming bodies 20, 20 are formed in the same state.
e and 20e are connected to air supply pipes 31 and 31, respectively, and the respective arc surface forming core forming bodies 22 and 22 are passed through the air supply pipes 31 and 31 respectively.
Air is additionally supplied into the core, and each arc surface forming core forming body 2
Inflate 0,20 until it is full.

As described above, each arc surface forming core forming body 2
By expanding 0,20, the core forming bodies 21,21 facing the right and left facing straight surfaces are respectively reinforced with supporting protrusions 21b, 21.
b, and press the inner peripheral surface forming core forming body 22 to the inner peripheral surfaces of the guiding projections 15a, 15a protruding from the peripheral edges of the core insertion holes 15, 15. The core 2 can be easily assembled by making the tension state crimped along the core.

When the core 2 is disassembled, the air in each arc-shaped core forming body 20, 20 is supplied to the supply / exhaust plug 20e,
Exhaust from 20e, make air capacity 60% ~ 80%,
The tensioned state of the inner peripheral surface forming core forming body 22 is released by slightly reducing each of the arc surface forming forming bodies 21, 21, and these core forming bodies 20, 20, 21, 21, 22. Can be easily dismantled by going back to the procedure opposite to the assembling procedure.

At this time, the ridges 22b, 22b, 22b of the inner peripheral surface forming core forming body 22 fitted to the inner peripheral surface of the rebar insertion hole 4 are provided.
Can be easily detached inward from the inner peripheral surface of the rebar insertion hole 4, and the stepped enlarged diameter portions 4a, 4a, 4a can be reliably formed on the inner peripheral surface of the rebar insertion hole 4. it can.

Accordingly, the core 2 is dismantled even after the concrete poured into the formwork device A is completely cured and solidified in the curing room. twenty one,
Since the resistance to pull out the 22 is small, it can be done easily.

As a result, there is no need to remove the core in a semi-cured state, and the production efficiency of the retaining wall block B can be significantly improved.

The volume of air that is always filled in the arc-shaped surface forming core forming body 20 is preferably 60% to 80%, but if it is around 90%, the additional supply amount when filling up is reduced. In addition to this, the amount of discharge at the time of dismantling the core can be reduced, and the labor for assembling and dismantling the core 2 can be further reduced.

FIG. 11 shows a retaining wall block B as another embodiment. The retaining wall block B has the same basic structure as the retaining wall block B, but has a front side. The reinforcing bar insertion hole 4 is formed in a circular shape in plan view.

When the circular rebar insertion hole 4 is formed, the core forming bodies 21 for forming a straight surface are not required.

[0055]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, since the stepped enlarged portion is formed on the inner peripheral surface of the through-hole and the nodal space is formed in the through-hole, concrete is provided in the through-hole. When concrete is cast, concrete is also filled in the nodal space, and a concrete column having a nodal portion in the through hole is formed, and the nodal portion securely integrates the concrete column into the block body. be able to.

Therefore, the reinforced concrete column is usually rigid as a rigid body against a positive bending moment generated by an external force such as earth pressure acting from the rear surface (rear surface) to the front surface (front surface) of the retaining wall from the rear surface (rear surface). On the other hand, in the event of an earthquake, a negative bending moment caused by seismic force, etc. acting from the front side to the rear side of the retaining wall during an earthquake, as in normal times The resistance as a rigid body can be exhibited.

As a result, despite the upward or downward force acting on the reinforced concrete column, the reinforced concrete column 8 functions as an integral structure with the block main body and does not slide, so that the reinforced concrete column 8 does not slide. A predetermined proof stress can be maintained.

According to the second aspect of the present invention, a mold body for molding the block body and a core for molding the through hole are provided, and the core is an inner peripheral surface for molding the inner peripheral surface of the through hole. The molding core forming body, comprising a supporting core forming body for supporting the same inner peripheral surface forming core forming body, the inner peripheral surface forming core forming body is a cylindrical shape made of an elastic material Formed body body, and formed from a ridge for forming a stepped enlarged portion integrally formed along the outer peripheral surface of the formed body body, the supporting core formed body in the circumferential direction of the through hole Since it is formed so as to be expandable and contractible, it is possible to reliably form the stepped enlarged portion on the inner peripheral surface of the through hole of the retaining wall block.

At this time, since the core for forming the through-hole can be expanded and contracted in the circumferential direction of the through-hole, the assembling work of the formwork apparatus and the removing work of the retaining wall block can be easily performed. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of a formwork device according to the present invention.

FIG. 2 is an explanatory plan view of the same formwork apparatus.

FIG. 3 is an explanatory side view of the formwork apparatus.

FIG. 4 is an enlarged front view of a core.

FIG. 5 is an explanatory sectional side view of the core.

FIG. 6 is a sectional front view of the core.

FIG. 7 is an exploded view of the core.

FIG. 8 is an explanatory view of assembling a core.

FIG. 9 is a perspective view of a retaining wall block.

FIG. 10 is an explanatory side view of a reinforced concrete column.

FIG. 11 is a perspective view of a retaining wall block as another embodiment.

[Explanation of symbols]

 A Formwork device 1 Formwork body 2 Core 20 Core forming body for arcuate surface forming 21 Core forming body for straight surface forming 22 Core forming body for inner peripheral surface forming

Claims (2)

[Claims] 1. A retaining wall block comprising: a front wall; and a retaining wall extending rearward from a rear surface of the front wall, wherein the retaining wall has a through-hole formed vertically therethrough. A block for a retaining wall, wherein a stepped enlarged portion is formed on an inner peripheral surface to form a nodular space in the through hole. 2. A formwork device for forming a retaining wall block according to claim 1, comprising: a formwork body for forming a block body; and a core for forming a through hole. An inner peripheral surface forming core forming body that forms the inner peripheral surface of the through hole, and a supporting core forming body that supports the inner peripheral surface forming core forming body are provided. The main body is formed of a cylindrical main body made of an elastic material, and a convex ridge for forming a stepped enlarged diameter portion integrally formed along the outer peripheral surface of the main body. A formwork device, wherein the die forming body is formed so as to be expandable and contractable in the circumferential direction of the through hole.