JP2000073332A - Construction method of reinforced concrete precast pond and corner wall reinforced concrete block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a reinforced concrete precast pond of high durability without water leakage or breaking generated from a corner part while facilitating connection of blocks at an artificial pond construction site without needing skill. SOLUTION: In a reinforced concrete precast pond construction method for constructing a side wall using a plurality of blocks, a linear part is constructed of a plurality of standard blocks 1, and corner part is constructed of a protruding corner wall block or a recessed corner block 4 integrating at least the corner part. The adjacent blocks are connected by prestressing steel, and at the corner part, reinforcement ends are jointed to each other by a sleeve type joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RC precast pond construction method for constructing an artificial pond such as an agricultural reservoir using RC blocks, and a corner wall RC block used in the method.

[0002]

2. Description of the Related Art Conventionally, as a concrete pond construction method,
RC block construction method in which concrete blocks are cast in place by assembling and connecting RC blocks pre-cast at a factory in advance (hereinafter simply referred to as blocks) instead of the cast-in-place concrete method in which the entire frame is constructed with cast-in-place concrete It has been known. Conventional R
In the C block method, as shown in FIG. 8B, an inverted T-shaped RC block including a footing portion 41 and a rising wall portion 42 is connected in a watertight manner to form a side wall, and a corner portion is footed. The portion is constructed by a plurality of trapezoidal corner blocks (in the example of the figure, a combination of a corner block 40B, a corner block 40A, a corner block 40B, and a corner block 40A), and the side wall straight portion is constructed by a standard block 40. . In the connection between the above blocks, the connection between the standard blocks 40 constituting the linear portion is as follows.
As shown in FIGS. 7B and 7C, the fastening recess 4 formed near the connecting edge of each of the rising wall and the footing portion.
A connecting bolt 45 communicating between the three bolts is arranged, and both ends of the connecting bolt are tightened with nuts.
And the connecting bolts are integrally connected in a state where the connecting bolts are completely embedded in the block. Further, since the corners which are arranged by intersecting the corner blocks at an arbitrary angle α cannot be connected in a state where the corner blocks are buried in the blocks like straight sections, as shown in FIG. A connecting angle 46 is fixed to the outer side surface of the connecting member 42, and the connecting angles are connected to each other by tightening and fixing the connecting angles with connecting bolts 47. In addition, the footing portion is integrated by pressing the ends of the reinforcing bars arranged inside.

[0003]

In the construction of the artificial pond by the above-mentioned conventional RC block method, the connection between the blocks is performed by connecting bolts at the straight portion, but the blocks which are heavy only by tightening with bolts are used. It is difficult to attract and firmly integrate. Moreover,
Since the connecting bolts are exposed to the outside at the corners, there is a problem that they are easily corroded and have poor durability. Further, since the joining direction of the corner portion and the joining edge are not perpendicular to each other, if it is strongly fastened, a sliding component force is generated at the joining edge, and strong fastening cannot be performed. Further, there is a problem that a highly skilled worker is required to press the reinforcing bars of the footing portion of the corner block against each other on site. In particular, if the connection of a plurality of blocks is not accurate at the corner, the strength is reduced and water tightness cannot be ensured, and problems such as the occurrence of water leakage from the connection portion occur. In addition, there is also a problem that as a result of requiring skill and complicated construction, the cost increases accordingly. Further, since stress is concentrated at the corners, even if the connection of the reinforcing bars is correctly made, air or water gradually penetrates into the joints, and water leakage or destruction is likely to occur, resulting in poor durability. These drawbacks are particularly noticeable when constructing a complex reservoir with many corners on a small area.

The present invention is to solve the above-mentioned problems of the conventional RC block construction method for constructing an artificial pond, and the connection of blocks at the site of the construction of the artificial pond is easily performed without skill. It is an object of the present invention to provide a durable RC precast pond construction method and a corner block therefor which can be easily integrated in a corner portion, can be easily constructed in a short time, and does not cause water leakage or destruction from the corner portion. .

[0005]

The inventor of the present invention has conducted various studies to solve the above-mentioned problems. As a result, the corner portion, which was conventionally divided into a plurality of blocks, is integrated into one block and connected. The present invention is based on the finding that the end faces are always abutted at right angles to the tightening direction, and that the connection between the blocks can be easily made by using a sleeve type joint instead of the conventional pressure welding method. It has been reached.

That is, in the artificial pond construction method of the present invention, in the RC precast pond construction method in which the side wall is constructed by a plurality of blocks, the straight portion is constructed by a plurality of straight blocks, and the corner portion is a corner in which at least the corner portion is integrated. It is characterized by being constructed with blocks. The blocks are tightly integrated into a watertight structure by connecting adjacent blocks with a tensioned PC steel material. As the PC steel material, a PC steel rod, a PC steel wire, or the like can be used.

The corner block is arranged such that the joint surface between the adjacent block and the tightening direction is always perpendicular to the corner block, so that the corner block is connected to the adjacent block with a PC steel material inside the block in the same manner as the straight portion. Became possible. In addition, at least the corner blocks are connected to each other by tensioning the PC steel material with another adjacent block and then connecting the ends of the reinforcing bars with a sleeve type joint, so that the corner portions can be strengthened without skill. It is desirable to be able to integrate.

Further, in the connecting method using a sleeve type joint between the ends of the reinforcing bars, the connecting portion for connecting the reinforcing bars whose moving directions are not parallel to the axis of the reinforcing bars is formed by removing the concrete near the sleeve. The open end of the sleeve is movably fitted to one of the rebars to a position at least coincident with the connection edge, and after abutment between the blocks, the sleeve is moved such that the connection edge is substantially in the middle, By adopting a joint method by filling the sleeve with mortar, it is possible to easily connect a reinforcing bar in a direction different from the setting direction of the block.

The corner wall block of the present invention used in the artificial pond method is a corner wall block including a wide footing portion and a side wall portion standing upright from the footing portion, wherein the side wall portion has at least a width. With a bend,
It is characterized in that it constitutes all the side walls of a single corner portion. A sleeve-type joint is embedded in one of the joining edges of the block with another block so that the open end of the sleeve end faces the joining edge, and a reinforcing bar is projected from the other joining edge. Thereby, the rebar can be firmly connected without relying on pressure welding.

The corner wall block can be set to any angle at the corner, and can be roughly divided into a concave corner block bent inward (ie, 180 ° or less) and an outer corner block (ie, 18 °).
(0 ° or more)
When bending inward, concrete can be saved by forming the footing portion into a V-shape.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a part of an RC precast pond constructed by the RC precast pond construction method constructed according to the present invention. The pond has a complicatedly curved peripheral wall.
It shows a case where it is bent at 0 ° and at a corner at 107 °. In this specification, the bending angle is 180 for convenience.
A corner portion of less than or equal to ° is called a concave corner portion, and a corner portion bent by 180 ° or more is called a convex corner portion. Therefore, in this embodiment, the corner is a convex corner portion,
The corner is a concave corner.

In the present embodiment, the blocks forming the peripheral wall (hereinafter simply referred to as blocks) are a standard block 1 forming a normal straight wall, a convex corner block 2 forming a corner wall, and an adjacent to the convex corner block. In addition, four types of blocks, a convex corner connecting block 3 in which a portion to be a joining overlap portion is cut out, and a concave corner block 4 forming a corner wall are connected. The basic cross-sectional shape of these blocks is the same as that of the standard block 1 shown in FIG. 5B, and includes a footing portion 1-1 and a side wall portion 1-2, and a pond side portion 1--1 of the footing portion 1-1.
1 'is formed to be small in width, and forms a connection edge with a concrete surface, a rubber sheet, or the like that forms the bottom of the pond. on the other hand,
The land side 1-1 "on which earth and sand etc. are placed is formed wide, and its left and right edges constitute a joining edge with an adjacent block. In the construction state, the land side of the footing portion is shown in FIG.
As shown in (b), it is buried underground. This wall structure is the same in the corner wall described below.

As shown in FIG. 2, in the present embodiment, the convex corner block 2 has a footing portion 2-1 having a rectangular shape, and a corner wall portion 2-2 having a hook-like shape bent at a right angle. The bent corner wall portion is integrally formed. Therefore, the pond side portion 2-1 'of the footing portion has a flat hook shape, and the land side portion 2-1 "has a rectangular shape. However, the shape of the footing is not necessarily limited to a rectangular shape, but is preferably as much as possible. In this embodiment, the shape of the footing 2-1 is formed in a rectangular shape (from the pond side to the land side). Is shorter than the depth of the other blocks, so that the adjacent block has a cut-out portion that overlaps with the standard block on the opposite side, as shown in FIG. It is sufficient to prepare only the convex corner connecting block 3 of the shape, and a standard block can be used on the opposite side, and the convex corner wall is formed by an integral block by devising in this way. It should be noted that although not shown in FIG. 2, each block has P
C steel material (PC steel rod is used in this embodiment) 31
In order to connect the PC steel material, a fixing recess 32 for applying tension to the PC steel material to fix the PC steel material is formed, and a PC steel material through hole 33 extending from the joint edge to the fixing recess is formed. Further, at the joining edge of the footing of the corner block, an end of the reinforcing bar projects or an end of the casing faces as described later.

The convex corner connecting block 3 has a shape in which the land side corner of the standard block is cut out as described above, and the notched land side edge 3-1c intersects at right angles with the cut side. It is a joining edge with the standard block 1.

On the other hand, the concave corner block 4 has a footing portion 4-1 having a plane shape substantially V-shaped as shown in FIGS.
A corner wall portion 4-2 stands upright in the shape of an inverted V in the vicinity of the vertex. For concave corners,
Even if the footing portion is lengthened, an overlapping portion with an adjacent block does not occur, so that the footing portion can be formed to have the same length as the joining edge of the adjacent block. The shape of the pond side 4-1 'of the footing part 4-1 is substantially rhombic, but the top is cut off at a position coinciding with the adjacent edge of the pond side 1-1' of the adjacent standard block 1. As a result, a corner edge 4-1b is formed and has a truncated shape. In addition, the land side portion 4-1 "is divided into two sides of a V-shape as shown in the figure, and each outer edge is a joining side edge 4-1a with an adjacent standard block. The shape of the footing is not limited to the above-described embodiment. For example, as shown by a virtual line in FIG. If there is no problem in strength, a V-shape as in this embodiment is desirable because it is lightweight, easy to handle, and low in cost.

The standard block, the convex corner block, and the concave corner block configured as described above are connected by abutting the side edges of the adjacent blocks. The steel members are arranged orthogonally, and as shown in FIG. 4, adjacent blocks are fixed to the PC steel members 31 by applying tension to the fixing members 32, and after fixing, the fixing recesses are filled with mortar and sealed. In the present embodiment, the connection by the PC steel material is performed at one location on the pond side, one location on the land side, and two locations on the side wall portion of the footing, but is not limited thereto and may be performed as needed. Further, in the present embodiment, the connection between the reinforcing bars arranged in the blocks at the corners is shown in FIG.
As shown schematically in (a), this is performed at the joint side edge of the footing. However, it may be performed at the joining edge of the rising wall as needed. In the figure, reference numeral 7 schematically shows a reinforcing bar connection portion. In the case of the convex corner connecting block, as shown in FIG.
c and the junction side edge 1-1a of the standard block. The connection of the reinforcing bars between the adjacent blocks may be performed between the standard blocks in the horizontal portion.

Next, the form of connection between the reinforcing bars between the blocks will be described with reference to the schematic views shown in FIGS. First,
The basic connection configuration is as follows: the joining edge of a block that has already been installed and is on the fixed side, for example, when assembling blocks sequentially from the left side in the arrangement of FIG. As shown in FIG.
An open end of the sleeve faces the joining edge 11 and a reinforcing bar 12 arranged from the other end toward the open end is an end of the sleeve 23. With it inserted near the center, it is embedded in concrete beforehand. The mortar inlet 21 and the mortar outlet 22
, The mortar injection pipe 25 and the mortar discharge pipe 26 are detachably fitted. A ring 27 is fitted to the open end where the reinforcing bar 12 fits in order to hold the reinforcing bar at the axial position of the sleeve. On the other hand, at the joining edge 16 of the movable block 15 joined to the fixed block 10, a reinforcing bar 17 is provided coaxially with its end protruding so as to fit into the sleeve 20.

In order to connect the reinforcing bars of the adjacent blocks in the joint configuration configured as described above, FIG.
The movable block 15 is moved relative to the fixed block from the state of (a), and the protruding portion of the reinforcing bar 17 is fitted to the sleeve, and is moved until the joining edges thereof are brought into close contact with each other. The mortar 28 (with rapid hardening and high strength) is injected from the mortar injection pipe 25 while the joining edges are in contact with each other. The mortar is completely filled in the sleeve by injecting the mortar to the outside from the mortar discharge pipe 26, and the mortar is hardened around the reinforcing bar in the sleeve, and the reinforcing bar is connected firmly. It is reported that the connection strength is equal to or higher than that of connection by pressure welding. In addition, the mortar filled in the sleeve leaks from the opening of the joining edge to the joining edge, so that the joining edges are brought into close contact with each other to seal the sleeve end, and the air that the sleeve enters through the gap between the joining edges. Also, it has an effect of preventing corrosion of the rebar joint and the rebar.

The above-mentioned joint method is good if it can be constructed only by joining from one direction, such as joining the standard blocks 1 or the standard block 1 and the concave corner block 4. For example, FIG. As in the case of the convex corner connecting block 3 shown in ()), the reinforcing bar is also used at the notched land side edge 3-1c which is the joining edge with the standard block that is perpendicular to the joining edge 3-1a with the convex corner block 2. In the case of connection, if the reinforcing bar protrudes from one edge, the convex corner connecting block 3 cannot be moved with respect to the convex corner block 2 because of the bar. In order to solve the problem, in the present embodiment, as shown by reference numeral 19 in FIG. 5B and FIG. The concrete near the part to be cut is previously cut off, and the sleeve is exposed so as to be able to be pushed in at least to a position where its open end coincides with the joining edge so as to be movable.

FIG. 7 is an enlarged view of a main part showing a method of connecting reinforcing bars between the standard block 1, the convex corner block 2, and the convex corner connecting block 3 shown in FIG. Standard block 1
2-1a of the projecting block 2 of the joining edges
6 (section a shown in FIG. 7) at a location facing
As shown in (a), the reinforcing joint is set in a state of being buried in the concrete, and in the section b where the notch land side edge 3-1c of the convex corner connecting block abuts, the open end of the sleeve 20 of the reinforcing joint is set. The sleeve can be slidably fitted to one of the rebar ends without casting concrete, and the sleeve can be slidably fitted, for example, as shown by an imaginary line in FIG. Is pushed to a position where it does not protrude from the block edge.
Note that the end of the reinforcing bar 30 in the section b is located near the joining edge so as not to protrude outside from the joining edge.

On the other hand, the convex corner block 2 has a reinforcing bar projecting from a joint edge facing the section a of the standard block, and a joint edge 2-1a with the convex corner connecting block has a dotted line as shown by a dotted line. The sleeve 20 is buried.
Further, the convex corner connecting block 3 has a joint edge portion facing the joint edge 2-1a in which the sleeve of the convex corner block 2 is buried, and a reinforcing bar protrudes from the joint edge portion.
As in the case of the standard block, concrete is not cast in a range where at least a half length of the sleeve of the reinforcing bar joint can be pushed, and the reinforcing bar is exposed. The end of the reinforcing bar is located near the notch land side edge so as not to protrude from the notch upper edge.

When assembling and constructing a block comprising the above joint mechanism as shown in FIG. 5A, first, a standard block 1 is set and fixed, and a convex corner block 2 is set in the direction of arrow p. Thereby, the reinforcing bar 31 protruding from the joint edge of the convex corner block 2 fits into the sleeve buried in the standard block, and the joint surfaces of the standard block and the convex corner block abut each other. In this state, the connection by the PC steel material described above is performed. Next, mortar is injected into the sleeve 20 in the section a, and the reinforcing bar of the standard block and the reinforcing bar of the convex corner block are connected by the above method. Next, the convex corner connecting block 3 is set in the direction of the arrow q, and when the joining edges of the convex corner block 2 and the convex corner connecting block 3 are abutted, the reinforcing bar 32 projecting from the convex corner connecting block becomes the convex corner block. It fits into the buried sleeve.
By injecting mortar into the sleeve in this state, the convex corner block 2 and the convex corner connecting block 3
And the rebar are connected.

When the convex corner connecting block is set, the notched land side edge 3-1c of the convex corner connecting block moves while slidingly contacting the joining edge in the section b of the standard block. Since the rebar does not protrude, it does not interfere with sliding. When the setting of the convex corner connection block is completed, the sleeve 20 is moved to the position indicated by the imaginary line in the section b to the solid line position where the middle part of the sleeve is located exactly at the joining edge. Thereby,
The ends of the reinforcing bars of the standard block and the convex corner block are located within the sleeve. In this state, the sleeve is buried, concrete is cast so that the block surface becomes uniform, and mortar is injected into the sleeve 20 by the method described above, whereby the reinforcing steels facing the section b are connected.

As described above, according to the joining method of each block of the present invention, since the connection is made by the sleeve type joint,
Unlike the conventional artificial pond block construction method, no rebar connection by pressure welding is required, so that the connection can be easily made without skill. Moreover, since the reinforcing bars can be connected not only in one direction but also in multiple directions, the blocks can be connected firmly. This is particularly important when the convex corner is formed by an integral block.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various design changes can be made within the scope of the technical idea. For example, the convex angle of the convex corner block and the concave angle of the concave corner block can be arbitrarily selected so as to correspond to the plan shape of the pond.

[0026]

As described above, according to the RC precast pond construction method of the present invention, since the corners can be constructed by an integral block, the strength of the corners where stress concentrates and easily breaks can be secured, and the watertightness can be secured. Performance can be ensured, and all disadvantages of the conventional block construction method can be eliminated. In addition, since the blocks including the corner blocks are connected integrally by applying tension to the PC steel material, the blocks can be firmly connected to a watertight structure. Furthermore, the connection between the reinforcing bars of the block is simple and economical without requiring skill compared with the case of the conventional pressure welding method, and the connection can be made in many directions and a strong connection can be made. Also, since the blocks can be easily joined and integrated, each block can be downsized so that factory production and transportation are easy.

Further, according to the corner wall block of the present invention, since the conventional corner portion is divided into a plurality of blocks and can be constituted by a single block, the corner portion can be constituted by a single block, so that the construction is easy and a short period of time. In addition, the corner portion can be formed in a watertight structure. In addition, since the joining edge of the corner block and the adjacent block is always perpendicular to the connection direction, it is made with PC steel embedded in the block and has excellent corrosion resistance. The connection can be made firmly without slipping on the surface.

[Brief description of the drawings]

FIG. 1 is a plan view showing a part of an RC precast pond constructed by an RC precast pond construction method according to an embodiment of the present invention.

FIGS. 2A to 2C are perspective views of a convex corner block which is an embodiment of the corner wall block of the present invention.

FIGS. 3A and 3B are perspective views of a concave corner block which is an embodiment of the corner wall block of the present invention.

FIG. 4 is a schematic view showing a connection state by a PC steel material at a concave corner portion.

5 (a) is an enlarged view of a main part of FIG. 1, and FIG. 5 (b) is a view on arrow AA.

FIG. 6 is a schematic view showing a reinforcing bar connection method according to the present invention,
(A) shows a state before connection, and (b) shows a state after connection.

FIG. 7 is a schematic view showing a method of connecting a reinforcing bar to the portion shown in FIG. 4;

8 (a) is a partial plan view of an RC precast pond by a conventional method, FIG. 8 (b) is a BB cross-sectional view thereof, and FIG.
And (d) show the joining state by the connecting bolt at the straight part and the corner part, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Standard block 2 Convex corner block 3 Convex corner connection block 4 Concave corner block 1-1,2-1,3-1,4-1 Footing part 1-2,2-2,3-2,4-2 Side wall part 7 Reinforcing Bar Connection 20 Sleeve 21 Mortar Injection Port 22 Mortar Outlet 23 Reinforcing Bar Joint 31 PC Steel Material 32 Fixing Recess

Continuation of the front page (72) Inventor Kenji Ishu 1839-1 Kunbu, Gushikawa-shi, Okinawa F-term in Daiwa Concrete Industry Co., Ltd. 2D048 AA45

Claims (8)

[Claims] 1. An R having a side wall constructed by a plurality of RC blocks.
In the C precast pond construction method, a straight portion is constructed by a plurality of straight RC blocks, and a corner portion is constructed by a corner wall RC block in which at least the corner portion is integrated. 2. The R block according to claim 1, wherein the RC block is formed by connecting adjacent RC blocks with a PC steel material.
C precast pond construction method. 3. The corner wall RC block is arranged such that a joint surface with an adjacent RC block is always perpendicular to a tightening direction, is connected to each adjacent RC block by a PC steel material, and has a reinforcing bar end. The R according to claim 1 or 2, wherein the two are connected by a sleeve joint.
C precast pond construction method. 4. The connection between the ends of the reinforcing bars includes a connecting portion for connecting a reinforcing bar whose moving direction is not parallel to the reinforcing member axis. The sleeve is movably fitted to one of the rebars to a position at least coincident with the joining edge, and
4. The RC precast pond construction method according to claim 3, wherein the sleeve is moved so that a joining edge is substantially intermediate after the abutment of the C blocks, and the mortar is filled in the sleeve. 5. A corner wall RC block comprising a wide footing portion and a side wall portion standing upright from the footing portion, wherein the side wall portion has at least a bent portion, and all the side walls of a single corner portion are provided. And a corner wall RC block. 6. A sleeve joint is embedded in one of the joining edges of the block and another block such that the open end of the sleeve end faces the joining edge.
The described corner wall RC block. 7. The corner wall RC block according to claim 5, wherein the side wall bent portion is a concave corner block having a bending angle of 180 ° or less. 8. The bending angle of the side wall bent portion is 180 ° or more.
The corner wall RC block according to claim 5 or 6, wherein the corner wall RC block is a convex corner block within a range of 360 °.