JPH0723625B2 - Construction method of concrete structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of constructing a concrete structure mainly composed of columns, beams and floor slabs of a concrete structure.

(Prior Art) In a conventional precast concrete building, PC members completed as members such as PC columns, PC beams, and PC floors are assembled by dry joints.

(Problems to be solved by the invention) The above construction method lacks integrity as compared with the conventional cast-in-place reinforced concrete construction method, and is complicated both structurally and in construction.
Become uneconomical.

(Means for Solving Problems) The present invention has been proposed in order to solve such problems, and in a ramen structure having a core or a through-beam and a multi-span ramen structure between beams and in both girder directions, , Pillar reinforcement is installed at each position of the outer peripheral column and the inner column,
Assemble the thin-walled PC column formwork with the surface finish on the outer peripheral column, and assemble the general column formwork to the inner column so as to surround the column rebars, Direction and girder direction of the beam to at least one direction of the beam to the lower end of the column to construct the column concrete to construct the outer column and the inner column, and then the inner span of the multi-span in the frame structure, the partial PC internal beam In the joint portion corresponding to the stigma of the internal column, the lower end main bar of the same beam is linearly connected at the stigma, and the outer end of the beam is provided with an anchor bar,
A partial PC internal beam with a span center joint at least at one end of the PC internal beam. Each of the lower end main bars of the above is joined at the center of the span, and further, of the inner columns facing the core or the blow-through portion, the columns except for the inner columns in the corners are directed to the outer peripheral column and are orthogonal to the core or the blow-through periphery. In the two-span inner ramen extending in the direction, the lower end main bars of the internal PC of the partial PC internal beam are connected linearly at the stigmas at the joints corresponding to the stigmas of the internal columns. An anchor beam is protrudingly provided, and an inner beam having a length of 2 spans without a span center joint is laid across the columns, and then the outer frame has a length of 1 span and an outer peripheral surface. The finished PC outer perimeter beam so that it is located above the floor surface. After horizontally crossing between the pillars, a thin-walled composite floor PC board with built-in lower end reinforcements is placed between the beams, and the upper end main reinforcements are arranged on the partial PC internal beams, and the composite floor PC board is also placed. With regard to the method of constructing a concrete structure characterized by placing the slab top bar on the top, placing the concrete of the joint part of each column and the span center joint part of the partial PC internal beam and the floor slab. is there.

(Function) In the present invention, in a ramen structure having a core or a blow-through and having a multi-span in the beam-to-beam direction and the girder direction, first, column bars are respectively installed at the outer peripheral column position and the inner column position, and the outer peripheral column position is finished on the surface. Assemble a thin-walled PC column formwork provided with the general in-situ concrete column formwork at the position of the inner column so as to surround the column reinforcement, and in each formwork place concrete up to the beam bottom end. The outer column and the inner column, which have been surface-finished by installing them, are constructed respectively, and the concrete parts of each column constitute beams and support materials for floor erection to ensure horizontal rigidity.

Next, in the multi-span inner rigid frame in the rigid frame structure, the lower end main bar of the internal beam is connected linearly at the stigma at the joint position corresponding to the stigma of the internal column of the partial PC internal beam, and Anchor streak is projected at the end,
Part having at least one end of the PC internal beam and having a span center joint part and having a length of one span to two spans. Join each bottom main bar comrades of PC internal beam at the center of span,
Thus, the internal beams made of the partial PC members are installed.
At this time, at the joint portion corresponding to the stigma of the internal column in the partial PC internal beam, the lower end main bars of the internal beam are linearly connected, so that the beam and the beam crossing at the stigma interfere with each other. There is no mutual contact. Moreover, since the internal beam is connected at the center of the span where the bending stress is extremely small during an earthquake, the amount of reinforcing steel is small and the connection is easy.

Further, for the inner ramen of two spans extending in a direction orthogonal to the core or the blow-through periphery from the pillars excluding the inner pillars at the corners of the inner pillars facing the core or the blow-through portion toward the outer peripheral pillar, At the joint part corresponding to the stigma of the internal column of the partial PC internal beam, at the joint part corresponding to the stigma of the internal column of the partial PC internal beam, the bottom main bar of the beam is linear at the stigma Anchor bars are projected at both ends of the beam, and an internal beam with a span of 2 spans without a span center joint is laid across the columns. The length of the PC outer peripheral beam with the outer peripheral surface finished as described above is installed horizontally between the outer peripheral columns so that it is located above the floor surface, and then the lower end reinforcement is built in between each beam. The thin composite PC board for the composite floor is mounted, and the partial PC internal beam and the composite floor P Internal beams and floor top reinforcements are laid on each upper surface of the C plate, and the required reinforcements are also applied to the beam-column joints.
The span center joint part of the internal beam and the concrete of the floor slab are cast in parallel, and the floor slab and the internal beam are completed to construct a reinforced concrete structure that is rigid as a whole.

(Examples) The present invention will be described below with reference to illustrated examples.

Fig. 1 shows a rigid frame structure with multiple spans between beams and girders that have a core or blowhole in the center, and column main bars (a) are installed at the outer and inner column positions, and at the outer column position, for example, the surface is finished. A thin-walled PC column formwork (1) in which tiles are driven as a material is assembled so as to surround the column bar (a) at the outer peripheral column position. Further, at the inner pillar position, a general pillar formwork (1 ') is assembled so as to surround the pillar main bar (a) at the inner pillar position, respectively, and the inter-beam direction is formed in each of the formwork (1) (1'). Further, among the beams in the girder direction, the column concrete is cast to at least the lower end of the beam in one direction to construct the outer peripheral column (A) and the inner column (A ′).

Thus, the concrete portion of the precast pillar constitutes a beam and a pillar for floor erection, and ensures horizontal rigidity.

Next, a PC wall plate (not shown) is attached between the outer column (A) and the inner column (A '), and then a beam is attached.

(C) is a partial PC internal beam with a U-shaped cross section, which is constructed as a multi-span beam with inner ramen. Here, (3a) is a lower end main bar and (3b) is a star rap protruding from the upper end of the beam. (Fig. 5) As shown in Figs. 1 and 3, a partial PC internal beam (C)
Is a joint (F) in which the lower main reinforcement (3a) of the beam is linearly connected at the joint portion (E) corresponding to the stigma of the inner column (A '), and at the center of the span of the beam, it joins with the adjacent inner beam. ′) Is provided, and the lower end main bar (3a) is projected on the joint part, and the lower end main bar (3a) joined to the outer peripheral column (A) extends and bends up at the outer end of the beam. These anchor muscles (3'a)
Are formed so as to have a length of 1 to 2 spans which are provided in a protruding manner.

More specifically, in a multi-span inner ramen, a PC inner beam (C) having a length of half the span is formed between the outer column (A) and the next inner column (A ') of the same column. A PC internal beam having a length of 1 span or 2 spans is laterally laid between A ′) and (A ′), and each PC internal beam is adjacent to the internal beam (C) at the span center joint (E). ) The lower end main bars (3a) (3a) of each other are joined in situ by, for example, an enclose solution. In the figure (S) is the support of the internal beam (C).

Further, as shown in FIG. 1, the partial PC internal beam (C) is an internal column (A ') facing the core or the blow-through portion, excluding the internal column (A') at the corner. It is constructed as a beam having a length of 2 spans of the inner ramen orthogonal to the periphery of the core or the blow-through portion from ′) toward the outer peripheral column (A). That is, the PC internal beam (C) extends over three columns: an outer peripheral column (A), an inner column (A ') facing the core or the blow-through part, and an inner column (A') located in the middle of both columns. It will be crossed. The same beam
At the joint portion corresponding to the stigma of the inner pillar (A ′) at the intermediate position, the lower end main bar (3a) of the beam is linearly connected at the stigma, and both ends of the beam (outer peripheral pillar (A ) Side and the inner pillar (A ') side facing the core etc.
a) is projected and has no joint (F ') at the center of the span 2
As a beam formed so as to have a length corresponding to a span, the beam is laid across each of the columns (A) (A ') (A').

(B) is a PC outer peripheral beam having a length of one span in which tile reinforcing bars (2) are projectingly provided at both ends, for example, tiles are driven into the outer peripheral surface, and between the outer peripheral columns (A). It is erected as a beam of outer ramen so that it is located above the floor (FL). In addition, in FIG. 4, (2a) and (2b) are respectively upper and lower main bars of the beam (B), and (2c) is a stirrup for each of the beams (B) adjacent to each other in the column (A). The reinforcing bars (2) for joining at the ends of the main bars (2a) and (2b) are anchored in the column at the portions where the plan bars are different. (FIGS. 1 and 2) Next, a thin-walled composite floor PC board (D) in which the lower end metal of the slab is built is installed between the beams (B) and (C). On this occasion,
The end of the composite floor PC board (D) has an internal beam (C) with a U-shaped cross section
On both sides of the inner beam (C) and the notch step (4) provided on the side surface of the outer peripheral beam (B) having a higher mounting level than the inner beam (C).

Next, the upper end main bar (3c) of the beam (C) is arranged and the upper end bar (5) of the floor slab is arranged. The end of the upper end streak (5) is anchored to the beam-column joint (E).

Next, the column-beam joint (E), the slab portion (F) on the internal beam (C), and the span center joint (F ') of the internal beam (C)
And, concrete is placed in the post-casting portion (G) of the floor slab on the above-mentioned composite floor PC plate (D), and the post-casting concrete integrates the columns, the PC beams, and the composite floor slab, resulting in a strong overall structure. Build a monolithic reinforced concrete structure.

According to the embodiment, the PC member of the PC pillar formwork, the partial PC internal beam, the PC outer perimeter beam, and the PC board for the composite floor is used, and the PC board for the composite floor also serves as the formwork during floor slab construction, and is precast. By combining the concrete construction method with the conventional cast-in-place concrete construction method, site work such as formwork and rebar construction is greatly reduced, rigidity during erection is secured, PC members are self-supporting, and there is no support or the number of them. Can be minimized, and the floor that has been erected becomes a large work space, and the next process can be immediately started, which shortens the construction period.

In the inner ramen with more span, the inner pillar (A ')
In the partial PC internal beam (C) having a span of 1 to 2 spans between the inner column (A ') and the outer column (A), the bending stress at the time of earthquake is very small. Since it is joined with the adjacent PC internal beam (C) at the center of the span,
The amount of rebar is small, and the construction of joints is easy.

(Effect of the invention) Thus, the construction method according to the present invention, the PC pillar formwork arranged to surround the pillar main bar built in the inner pillar position and the outer circumference pillar position, PC pillar form concrete A 1- to 2-span partial PC internal beam (inner span with multiple spans) that is laid between the cast inner and outer columns and has a connecting lower end main bar projecting in the central joint, and 2 without a span central joint PC internal beam with a length of span (2 span inner ramen), PC outer perimeter beam (outer ramen) with joint reinforcing bars protruding from both ends and finishing on the outer peripheral surface, built-in bottom bar PC of floor PC board
PC for synthetic floor by using members and arranging upper main bars on the inner beam
The slab top bar is arranged on the board, the joint of each column beam and the span center joint of the internal beam and the concrete of the floor slab are placed, and the internal beam is used for the partial PC internal beam and the composite floor PC plate. By combining the precast concrete construction method, which also serves as the formwork for floor slab construction, with the conventional cast-in-place concrete construction method, the pillar beam and slab can be integrated to construct a reinforced concrete structure with a rigid overall structure. it can. In addition, on-site work such as formwork and rebar construction has been greatly reduced, rigidity during construction has been secured, PC members are also self-supporting, and it is possible to eliminate the support or minimize the number of supports. After that, the floor becomes a large work space and you can immediately move to the next process such as equipment and finishing.
By repeating the cycle process, the construction period can be significantly shortened.

Further, according to the present invention, at the joint portion corresponding to the stigma of the internal column of the partial internal PC internal beam, since the lower end main bars of the beam are linearly coupled, the stigma intersects the beam and is joined. The beam and beam should not interfere with each other, and the joint between the column and beam can be easily constructed.

According to the present invention, the outer peripheral column of the outer frame of the structure,
The surface was finished and concrete was placed on a thin PC column formwork that surrounds the main pillar of the column, and the outer beam was erected on the outer column and the outer beam was pre-finished on the outer surface. Since it is made of PC beams and is located above the floor surface, the finishing process can be omitted, and therefore the external finishing erection scaffolding can be omitted, and the waist beam is not necessary because the outer peripheral beam doubles as the waist wall. Become.

In addition, in the present invention, as described above, a partial PC internal beam having a length of 1 span to 2 spans is laid horizontally between the inner pillars and between the inner pillar and the outer peripheral pillar to prevent the occurrence of an earthquake in a middle- and high-rise building. Since the internal beams that are adjacent to each other at the center of the span where the bending stress is extremely small are joined, the amount of rebar is less than when joining the internal beams at the end of the span, and the joint can be constructed. It will be easier.

In addition, a 2-span inner frame that faces the core or the blow-through part and extends in the orthogonal direction is a span center joint that is connected to the lower end main bar of the partial PC internal beam at the joint site corresponding to the stigma of the internal column. Since an inner beam having a length of 2 spans without a portion is laid horizontally between the outer column and the inner column, the work efficiency is improved because the concrete is placed only at the joints between the column beams.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a concrete structure constructed by the method of the present invention, FIG. 2 is a partial vertical cross-sectional view showing the construction condition of the outer peripheral portion thereof, and FIG. Third
The figure is a partial vertical cross-sectional view showing the construction condition of the inner part thereof, and FIG. 1 is an arrow view III, FIG. 4 and FIG. 5 are longitudinal cross-sections showing the joint between the outer beam and the inner beam and the floor slab, respectively. A plan view, FIGS. 6 and 7 are a front view and a plan view, respectively, showing a joint portion of an internal beam. (A) …… Outer peripheral column, (A ′) …… Internal column, (B) …… PC outer peripheral beam, (C) …… Partial PC internal beam, (D) …… Composite floor PC board, ( E) …… Column-beam joint, (F) …… Slab part on internal beam, (G) …… Floor slab post-strike part, (1) …… PC column formwork, (2) …… Reinforcing bar , (3a) …… Main lower bar of inner beam, (3b) …… Stirrup of inner beam, (5) …… Upper bar of floor slab.

Front page continuation (71) Applicant 999999999 Takenaka Corporation Ltd. 4-27, Honmachi, Higashi-ku, Osaka-shi, Osaka (72) Inventor Hideo Nakata 2-34-4 Shirasagi, Nakano-ku, Tokyo (72) Inventor Fujii Azai Tokyo 1-2-7 Moto-Akasaka, Minato-ku Kashima Construction Co., Ltd. (72) Inventor Masahiro Yoshimura 2-16-3-406 Kinuta, Setagaya-ku, Tokyo (72) Inventor Shigetaka Abe 8-chome, Ginza, Chuo-ku, Tokyo 21st No. 1 Takenaka Corporation Tokyo Main Store (72) Inventor Naoshi Miyazaki 1-5-36 Tamagawa Gakuen, Machida, Tokyo

Claims (1)

[Claims] 1. In a rigid frame structure having a core or a through-beam and a multi-span in both girder directions, column reinforcing bars (a) are first installed at respective positions of the outer peripheral column (A) and the inner column (A '). , The outer peripheral pillar (A) is assembled with a thin-walled PC pillar formwork (1) having a surface finish, and the inner pillar (A ') is provided with a general pillar formwork (1'), respectively. Assembling so as to surround a), and each of the pillar formwork (1)
In (1 '), a column concrete is cast up to at least one of the beams in the beam-to-beam direction and the girder-direction beam to construct the outer peripheral column (A) and the inner column (A'), and then the ramen. In the multi-span inner rigid frame in the structure, the lower end main bar (3a) of the partial PC internal beam (C) at the joint portion (E) corresponding to the stigma of the internal column (A ') is linear at the stigma. The PC internal beam (C) is connected and has an anchor bar (3'a) protruding from the outer end of the beam.
A plurality of partial PC internal beams (C) each having a span center joint portion (F ′) provided at least at one end and having a length of 1 span to 2 spans are laterally bridged between the columns to be adjacent to the beams. Each of the lower end main bars (3a) (3a) of the partial PC internal beam (C) is connected at the center of the span, and the internal column (A ') at the corner of the internal column (A') facing the core or the blow-through portion is further connected. ) Is removed from the column (A ') toward the outer peripheral column (A), the inner column of the partial PC internal beam (C) has a two-span inner ramen extending in a direction orthogonal to the core or the surrounding area. At the joint portion (E) corresponding to the stigma of (A '), the lower end main reinforcement (3a) of the beam is linearly connected at the stigma, and anchor reinforcements (3'a) project at both ends of the beam. An internal beam (C) having a length corresponding to two spans, which is provided and has no span center joint portion (F '), is horizontally installed between the columns (A) and (A'), As for the outer ramen, the PC outer peripheral beam (B) having a length of one span and having the outer peripheral surface finished is positioned above the floor surface (FL) so that the outer peripheral pillar (A) ( After horizontally straddling between A), a thin-walled PC floor (D) for composite floors with built-in lower end streaks is placed between the beams, and the upper main bar (3C) is placed on the partial PC internal beam (C). The slab upper end reinforcements (5) are arranged on the PC board (D) for the composite floor, and the joints (E) of the columns and the span center joints (F ′) of the partial PC internal beams (C) are reinforced. And a method for constructing a concrete structure, which comprises placing concrete for a floor slab.