JPH0728270Y2 - PC concrete pillar for rebar - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a PC concrete column for a reinforcing bar, which allows a column for a reinforced concrete to be prefabricated on the factory side.

[Conventional technology]

Conventionally, in construction sites such as buildings and condominiums, a plurality of column reinforcements are projected in an array set at each position where reinforced concrete columns are to be built, and these column reinforcements are moved relatively by the hoop reinforcements and the binding reinforcements. After restraining it so that it will not be locked, a panel for concrete driving is assembled according to the cross-sectional shape of the reinforced concrete column to be made on the outside, and the panel is waited for the concrete drawn into this panel to solidify. Reinforced concrete columns were made by dismantling and separating from the solidified concrete surface.

When extending a reinforced concrete column upward, to the column reinforcement protruding from the upper end surface of the already formed column,
The column height was increased by joining the lower ends of the column bars of the next column and then repeating the same procedure as above.

[Problems to be solved by the device]

As in the past, when all reinforced concrete columns are made by on-site work, not only the construction cost is high due to the large amount of manpower and labor required for the preparation work until the concrete is poured, but also the lottery into the panel. Since it takes a long time to wait for the lumps of concrete to be solidified, it was not possible to shorten the period required for the construction of buildings and condominiums and proceed with work efficiently.

This invention was made in view of the above circumstances, and the purpose thereof is to make columns for reinforced concrete in advance on the factory side so that columns for reinforced concrete can be efficiently produced in a short period of time. It is intended to provide a PC concrete column for reinforcing bars.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the present invention, a plurality of bars are regularly arrayed penetrating in the length direction, and the reinforcing bars (4) inserted at the construction site are fixed to other reinforcing bars (13). The hollow casing (2) into which the cement milk (24) is injected, the internal rebars (5, 6) which are connected to the hollow casing and are reinforced, and the internal rebar and the hollow casing In addition to the above, in the factory, a concrete main body having a through hole (11) penetrating in the lengthwise direction in the center and anchor bolts (10) protruding from both ends in the lengthwise direction of the concrete main body are provided. After being manufactured, it is combined with other members at the construction site to form a part of the structure, and receives a load in the length direction.

In this invention, the fittings (8, 9) may be fixed to both ends of the concrete main body by the nuts (19) corresponding to the anchor bolts. In this case, the fittings (8, 9) are Two flat plate-like mounting plates (8A) having bolt holes (8a) and a plurality of connecting plates (8B) having through holes (8b) fixed orthogonally to the two flat plate-like mounting plates. It is preferable to be composed of and.

Further, the joint steel pipe (25) may be inserted into the through hole (11) of the concrete main body so that the two columns are vertically connected.

[Action]

Since the PC concrete columns are provided with multiple casings in a set arrangement, the foundation concrete surface,
Or, each column bar protruding from the upper end surface of the lower column is combined with each column bar that is inserted into each casing, or polymerized for a set length, and these column bars are inserted in each casing. When solidified by the cement milk that is drawn in, steel bars will continuously pass from the foundation concrete surface of buildings and condominiums to the top floor pillars, and PC concrete with a casing that can be made on the factory side The pillars will be reinforced concrete pillars with sufficient strength at the construction site.

〔Example〕

1 and 2 show an embodiment of a PC concrete column for reinforcing bars according to the present invention.

The pillar 1 of PC concrete is, for example, a square with a side of about 50 cm, and is made to have a length of about 2.5 m. The four corners of the cross section are chamfered over the entire length direction, The cross section of the pillar 1 is not limited to a square shape, and may have any shape.

In the cross section of the pillar 1, a plurality of hollow casings 2 arranged at regular intervals along a square line are provided so as to penetrate in the length direction of the pillar 1. These casings 2
As the material, iron, aluminum, or plastic having an outer diameter of about 50 to 60 mm is used, so that the columnar bar 4 having a diameter of about 22 mm can be easily inserted.

As shown in FIG. 1 and FIG. 2, the inner surface and the outer surface of each casing 2 have a locking portion formed of a convex portion or a spiral ridge.
3,3 are formed. The locking portion 3 on the outer surface serves to strengthen the connection between the pillar 1 drawn into the outside of the hollow casing 2 and the concrete, and the locking portion 3 on the inner surface is inserted into the inside of the hollow casing 2. When the column bar 4 is fixed by the cement milk 24 drawn into the inside of the casing 2 as described later, it functions to strengthen the bond between the cement milk 24 and the column bar 4 (Figs. 5 and 6). reference). Therefore, the locking portions 3, which are formed on the inner surface and the outer surface of the casing 2,
3 is not limited to a convex portion or a spiral convex line, and may have another structure having the same function.

Each casing 2 in the pillar 1 has a plurality of hoop streaks 5 arranged at the water level at a constant pitch in the length direction so that the relative positional relationship does not change due to the concrete drawn outside them. Are combined by. Reference numeral 6 is a binding muscle that fixes the contact portion between each casing 2 and the hoop muscle 5.

The number of PC concrete pillars 1 required in advance of the construction of buildings and condominiums is made on the factory side by the following procedure.

First, a plurality of casings 2 are held in a set arrangement, and these casings 2 are connected to each other with a certain distance in the length direction thereof by a hoop muscle 5 and a binding muscle 6 so as not to be displaced relatively. To do. This casing assembly is held horizontally or vertically, and a panel for concrete driving (not shown) is assembled on the outside thereof in accordance with the cross-sectional shape of the PC concrete column 1 to be made.

After pouring concrete into the space inside the panel and the outside of each casing 2 to solidify it, the panels are uncoupled and separated from the solidified concrete surface, and a plurality of casings 2 are arranged in a predetermined shape. PC concrete pillar 1 is created. In order to improve the engagement with another PC concrete pillar 1 to be joined and the beam 7 partitioning each floor, both side surfaces of the pillar 1 made on the factory side should have, for example, a square pyramid with a low height on both end surfaces. A trapezoidal engaging protrusion 1a is formed. The shape of the engaging protrusions 1a formed on both end surfaces of the pillar 1 is
The shape is not limited to the truncated pyramid, and other shapes may be used.

The pillar 1 has engaging projections 1a formed on both end surfaces, and the fittings 8 and 9 as shown in FIGS. 3 and 4 are used for coupling with the concrete foundation surface A and other pillars 1. In this case, a plurality of anchor bolts 10 are set at positions that engage with a plurality of bolt holes 8a, 9a provided in the horizontal mounting plates 8A, 9A above and below these mounting brackets 8, 9, respectively. It is provided so as to project by a specified length.

Through holes 11 are provided in the longitudinal direction of the central portion of the pillar 1, and the amount of material used is saved, the production cost is reduced, the weight is reduced, and the material is transported while the strength of the pillar 1 is hardly reduced. Others are designed to be easy to handle. The through hole 11 is also used to prevent lateral displacement of the central portion of the pillar 1 when the pillar 1 is joined to another member without using the mounting hardware 8 or 9.

Each of the mounting brackets 8 and 9 has two horizontal mounting plates 8A and 9A connected by four vertical connecting plates 8B and 9B, respectively. In addition to the bolt holes 8a and 9a of the
Circular holes 8C and 9C of approximately the same size as 1 are provided. Mounting bracket 8 that connects the pillar 1 to the foundation concrete surface A
Is slightly lower in height than the mounting bracket 9 that connects the pillar 1 to another pillar 1, and the number of the bolt holes 8b provided in the connecting plate 8B is the same as that of the bolt holes 9b provided in the other connecting plate 9B. It is less than the number.

Next, a case of making a reinforced concrete column on the site side using the column of this example will be described.

FIG. 5 and FIG. 6 show a state in which a reinforced concrete column is constructed on the basic concrete surface A. On the concrete surface A of the foundation for constructing reinforced concrete columns, anchor bolts 12 are projected at respective positions that engage with the plurality of bolt holes 8a of the mounting bracket 8 and are arranged in the column 1 of PC concrete. A column bar 13 having a different length is projected at a position corresponding to each casing 2. Reference numeral 14 denotes a concrete-made truncated cone-shaped protrusion formed in the central portion of each set of anchor bolts 12 protruding from the basic concrete surface A.

The reinforced concrete columns for the first floor are constructed on the basic concrete surface A by the following procedure, for example.

Take out the pillar 1 for the first floor from the PC concrete pillars 1 made on the factory side and carried in advance to the construction site, and attach the metal fitting 8 for connecting to the concrete foundation surface A on the lower end face. And the mounting fitting 9 for coupling with the pillar 1 on the second floor is fixed to the upper end surface. These are fixed by inserting the bolt holes 8a and 9a of the mounting brackets 8 and 9 into the anchor bolts 10 and 10 protruding from the upper and lower end surfaces of the pillar 1 and screwing the anchor bolts 10 and 10 into the nuts. 15,15
It is done by tightening. Mounting bracket for pillar 1
Fixing 8, 9 may be done not only at the construction site but also at the factory side.

After the fixing of the mounting brackets 8 and 9 is completed, the column reinforcement 4 is inserted into each casing 2 penetrating the PC concrete column 1 and held so as not to fall off. The column 1 with the column reinforcement 4 inserted Is vertically hung above the anchor bolts 12 and the column bars 13 of each set projected from the foundation concrete surface A.
This suspension is performed by holding the wire 16 connected to the mounting fitting 9 on the upper side of the pillar 1 on a hook 17 such as a tow truck.

In a state where the pillar 1 is suspended vertically, the respective pillar reinforcements 4 projecting downward from the respective casings 2 are vertically arranged in pressure contact with the upper ends of the corresponding pillar reinforcements 13 projecting from the foundation concrete surface A. After welding and cooling of each weld, the PC concrete column 1 is lowered along a plurality of sets of column bars 4 and 13 joined by welding. By this descent, a plurality of anchor bolts 12 protruding from the foundation concrete surface A
Are inserted into the corresponding bolt holes 8a of the mounting member 8 fixed to the lower end surface of the pillar 1.

When the fitting 8 comes into contact with the projecting portion 14 of the foundation concrete surface A and the descent is stopped, the braces 18, 18 connected to the bolt holes 9b, 9b of the different fitting plates 9B, 9B of the upper fitting 9 are attached. The pillar 1 is made vertical by using it, and the pillar 1 of PC concrete is fixed vertically to the basic concrete surface A by the nuts 19 screwed onto the anchor bolts 12 protruding from the basic concrete surface A.

When this fixing is completed, the braces 18 and 18 are released from the connection with the upper mounting member 9 and removed. Then, through the plurality of pillar reinforcements 4 projecting from the upper end surface of the pillar 1, the holes of the respective mounting members 20 projected on the side surfaces of the respective beams 7 serving as the floor members of the second floor are inserted, and Each connecting plate of the other mounting member 21 provided on the side surface and the mounting bracket 9 of the pillar 1
9B and 9B are connected to each other by bolts and nuts to fix each beam 7 horizontally.

After each beam 7 for the second floor is fixed to the upper end side of the pillar 1, a reinforcing bar 22 for soil is arranged in the space portion between the foundation concrete surface A and the lower end surface of the pillar 1, and the soil concrete 23 To form the floor of the first floor. Next, the cement milk 24 is drawn into the space between the casings 2 in the column 1 and the column reinforcements 4,13 inserted into the hollow holes of the column 1 from the upper side while removing air from the column reinforcements 4,13. When is fixed vertically, the PC concrete pillar 1 made on the factory side becomes a reinforced concrete pillar at the construction site.

The column bar 4 projecting from the upper end surface of the column 1 is formed by bundling the outer portion of the upper mounting member 9 with a hoop line, and the upper side of the mounting unit 9 is the same as the column 1 for the first floor explained. By the procedure, columns and floors made of reinforced concrete for the second floor are created, and thereafter, the same procedure is repeated to build a building or condominium with the required number of floors.

In the reinforced concrete pillar thus produced, the concrete inside and outside the casings 2 is integrally coupled by the locking portions 3 protruding on the inner surface and the outer surface of each casing 2 to form the column reinforcement 4 Since the and 13 are firmly fixed in the column 1, the strength of the obtained reinforced concrete column is
It can be made to have almost the same strength as the conventional reinforced concrete columns that were made directly at the construction site.

Therefore, the PC concrete pillar 1 of the configuration of this embodiment
The reinforced concrete columns, which had been thought to be made only at the construction site, were equipped with the required number of casings 2 pre-made at the factory side.
It can be made extremely efficiently using PC concrete pillar 1.

In this way, in the construction of buildings and condominiums, PC
If it is possible to carry the concrete columns 1 from the factory that produced them to the construction site to make them into reinforced concrete columns, the number of preparation steps required for concrete injection can be reduced compared to the case of making reinforced concrete columns at the construction site. Not only can it be done without waiting for the concrete that had been cast into the panel at the construction site to solidify, the work efficiency at the construction site can be improved, and the period required for building buildings and condominiums can be greatly shortened. The cost can be greatly reduced.

Also, when PC concrete pillars 1 can be made on the factory side, pillars 1 can be laid horizontally, freeing from the constraint that conventional reinforced concrete pillars could only be made vertically. Since it can be manufactured even in the open state, it becomes easy to produce the pillar 1 on the factory side and to provide the through hole 11 in the center thereof. Moreover, the through hole 11 provided in the pillar 1 not only reduces the amount of material used to reduce the production cost, but also reduces the weight and facilitates the handling of the pillar 1.

FIG. 7 shows another embodiment of the present invention, in which the engaging convex portion 1a is provided on the upper end surface of the column and the engaging convex portion 1a is provided on the lower end surface thereof.
This is the case where the stepped portion 11a is formed by providing the engaging recessed portion 1b that can be engaged with the through hole 11 and slightly increasing the diameters of the upper and lower end portions of the through hole 11.

In this case, the two columns 1 and 1 are connected to each other by connecting the lower half of the joint steel pipe 25 having the stopper 26 at the outer periphery of the central portion in the longitudinal direction to the through hole 11 provided in the central portion of the lower column 1. Insert
Same as that described in the above embodiment except that the through hole 11 of the upper pillar 1 is fitted in the upper half of the Johnito steel pipe 25 projecting from the end surface of the lower pillar 1 and the use of the mounting bracket 9 is omitted. Then the reinforced concrete column is extended upward. The lower end of the johnite steel pipe 25 fitted in the pillar 1 is
The stopper 26 is received by the step portion 11a of the through hole 11 having a smaller diameter on the way, and the stopper 26 is held by the upper end surface of the lower column 1. The contact portion between the upper pillar 1 and the lower pillar 1 is fixed by a binder 27 such as a bond or mortar.

In the case of this embodiment, the columns 1,1 of PC concrete to be joined in the height direction are prevented from being displaced in the lateral direction by the johnite steel pipe 25 fitted in the through holes 11,11, and are placed in each casing 2. Each of the inserted column bars 4 is made into a PC by the cement milk 24 that is drawn into the casing 2 and solidified.
Since it is firmly connected to the concrete pillar 1, the same effects as those described in the above-mentioned embodiment can be obtained.

In addition, in each of the above-mentioned examples, the pillar 1 of PC concrete
Can be formed with the trapezoidal pyramid-shaped engaging protrusions 1a, 1a on both end faces, or the engaging protrusion 1a on one end face and the engaging protrusion 1a on the other end face. Although the description has been given of the case where the square pyramidal trapezoidal engagement recess 1b is formed, the shapes of the engagement recesses and the engagement projections provided on both end faces and the combination thereof may be freely changed. In addition, in each of the above-mentioned embodiments, the column bar welded in a state of being pressed against the height
It is not always necessary to weld 4,4 in a state of pressure contact, and the tip ends of the columnar bars 4,4 are overlapped by a set length and the overlapped parts are connected by binding ties, or not connected in each casing 2 It may be fixed by cement milk 24 that is drawn.

[Effect of device]

Since the present invention is configured as described above, the column reinforcements inserted in each casing are connected to the foundation reinforcements or the column reinforcements projected from other concrete columns, respectively, or overlapped for a set length. Then, by fixing with cement milk drawn into the casing, the PC concrete pillar that can be made on the factory side can be used as a strong reinforced concrete pillar at a construction site such as a building or an apartment.

Further, according to the configuration of the present application, since columns for reinforced concrete can be pre-fabricated on the factory side, productivity of the columns can be improved and cost can be reduced, and at the same time, the cross-sectional shape of the columns can be changed at the construction site. The number of steps required for preparatory work such as assembling panels together can be reduced, and the waiting time for the concrete in the panels to solidify can also be saved, improving the work efficiency at the construction site and improving The construction period can be significantly shortened and the construction cost can be reduced.

Also, since a plurality of anchor bolts are projected,
In the case of a reinforced concrete column, it is possible to ensure alignment with the foundation concrete surface and other columns and to strengthen the bond.

Furthermore, since a through hole is provided in the center of the pillar,
The weight can be reduced and the amount of material used can be saved with almost no reduction in the strength of the column. Further, in joining columns together, if a johnite steel pipe is fitted into the portions of the through holes that face each other, the positions of the columns of reinforced concrete can be extremely easily aligned even without using a fitting.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, a perspective view showing the internal structure by removing a part of concrete, FIG. 2 is an enlarged sectional view of the main part, and FIGS. 3 and 4 are different from each other. FIG. 5 is a perspective view of the mounting bracket, FIGS. 5 and 6 are vertical cross-sectional views showing a state where a reinforced concrete column is made at a construction site, and FIG. 7 is a cross-sectional view of an essential part showing another embodiment of the present invention. is there. 1 ... PC concrete pillar 1a, 1b ... Engaging surface 2 ... Hollow casing 3 ... Locking part, 7 ... Beam 8,9 ... Mounting bracket, 10 ... Anchor bolt 11 ... Through hole

Claims (3)

[Scope of utility model registration request] 1. A plurality of rods are regularly arranged so as to penetrate in the length direction, and a cement bar (24) is inserted after a reinforcing bar (4) inserted at a construction site is fixed to another reinforcing bar (13). ) Is injected into the hollow casing (2), internal rebars (5, 6) that are reinforced by being combined with the hollow casing, and the internal rebar and the hollow casing are contained in the interior and A concrete main body having a through hole (11) penetrating in the center of the concrete body and anchor bolts (10) protruding from both ends in the length direction of the concrete main body. A column made of PC concrete for reinforcing bars, which forms a part of a structure by combining with other members and receives a load in the length direction. 2. A plurality of pieces are regularly arranged so as to penetrate in a length direction, and a cement milk (24) is inserted after a reinforcing bar (4) inserted at a construction site is fixed to another reinforcing bar (13). ) Is injected into the hollow casing (2), internal rebars (5, 6) that are reinforced by being combined with the hollow casing, and the internal rebar and the hollow casing are contained in the interior and the length direction By the concrete main body having a through hole (11) penetrating to the center in the center, the anchor bolts (10) protruding from both ends of the concrete main body in the length direction, and the nuts (19) corresponding to the anchor bolts. ,
It is equipped with mounting brackets (8, 9) fixed to both ends of the concrete main body at a factory or a construction site, and the mounting brackets (8, 9) are two flat plate-shaped mountings having bolt holes (8a). A reinforcing bar characterized by comprising a plate (8A) and a plurality of connecting plates (8B) having through holes (8b) fixed orthogonally to the two plate-like mounting plates.
PC concrete pillar. 3. A plurality of pieces are regularly arranged so as to penetrate in the length direction, and a cement milk (24) is formed after a reinforcing bar (4) inserted at a construction site is fixed to another reinforcing bar (13). ) Is injected into the hollow casing (2), internal rebars (5, 6) that are reinforced by being combined with the hollow casing, and the internal rebar and the hollow casing are contained in the interior and the length direction Reinforcing bar having a concrete main body having a through hole (11) passing through the center in a central part and forming a part of a construction by being combined with other members at a construction site and receiving a load in the longitudinal direction. PC concrete column (1) for use in construction, characterized in that two columns are vertically connected by a joint steel pipe (25) inserted into the through hole (11) of the concrete main body. PC concrete columns for rebar.