JPH04281947A - Precast reinforced concrete post material and precast reinforced concrete walling - Google Patents

Abstract

PURPOSE:To promote execution efficiency of a post and a wall, efficiency and reliability as well as joint efficiency of post main reinforcing bars and wall axial reinforcing bars by providing middle step lapped joints consisting of main reinforcing bars, axial reinforcing sheath pipes and supporting bars to a precast reinforced concrete post material and the same walling. CONSTITUTION:Sheath pipes 4 for a plurality of post main reinforcing bars 9a and b are buried, while penetrating vertically, into a hollow cylindrical precast concrete main body 1 buried with a large number of hoops 3a, b and c therein. Supporting bars 5 are provided along the central part of the sheath pipes 4 to form a precast reinforced concrete post material 10 formed in middle step lapped joints 4 and 5 for the post main reinforcing bars 9a and b. A plurality of wall axial reinforcing sheath pipes are vertically penetrated into a plate- like precast concrete main body buried with a large number of vertical and horizontal reinforcing bars therein. The supporting bars are provided along the central part of the sheath pipes to form a precast reinforced concrete walling formed on middle step lapped joints of the wall axial reinforcing bars.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to precast reinforced concrete column materials and precast reinforced concrete wall materials for rigid frame structures made of reinforced concrete.

0002

[Prior Art] In the construction of the above-mentioned reinforced concrete rigid frame structures, a pre-assembly method has been developed in which reinforcing bars are assembled in advance in a factory, etc., and the assembled reinforcing bars are transported to the construction site and installed. A construction method has been developed and widely used in which pre-manufactured precast reinforced concrete columns, beams, flooring materials, wall materials, etc. are transported to the construction site, placed, and concrete is poured to form the structural material (framework). This reduces the need for formwork, simplifies the process, improves efficiency, shortens the construction period, and improves construction accuracy.

[0003] Furthermore, the conventional precast reinforced concrete column material has a structure in which, for example, a large number of tie bars (shear reinforcing bars) and column main bars (partially protruding) are buried in a solid precast concrete (PC) main body. The precast reinforced concrete wall material has a structure in which, for example, a large number of vertical and horizontal reinforcements and wall axial reinforcements (some of which protrude) are embedded in a main body of precast concrete (PC). Furthermore, to explain the precast reinforced concrete wall material (earthquake-resistant wall), as shown in FIG.
The steel pipe joint b is buried in the lower part of the plate-shaped precast concrete main body part a in which the wall shaft reinforcement c is buried, and the steel pipe joint b
Place the lower part of the wall axial reinforcement c inside, and sheath the precast reinforced concrete wall material to the wall axial reinforcement protrusion c on the floor from above, and insert the protrusion c of the wall axial reinforcement c into the steel pipe joint b. A wall axial reinforcement joint is provided in which the upper and lower ends of the wall axial reinforcement c are butted and connected by inserting and erecting and injecting grout into the steel pipe joint b. Similar column main reinforcement joints are also provided in the precast reinforced concrete column material.

0004

[Problems to be Solved by the Invention] In both the conventional precast reinforced concrete column materials and the precast reinforced concrete wall materials, column or wall shaft reinforcements are embedded (partially protruded) in the main body of the precast concrete, so it is difficult to arrange the main reinforcements. There is no flexibility in the reinforcement and construction, which is a hindrance to transportation, placement, etc. Also, the protrusion of the short column main reinforcement or wall axis reinforcement on the floor is attached to the short steel pipe joint b buried under the main body part. The joint mechanism is such that the shaft reinforcement is butted and connected at the lower end of the pillar material and wall material, where stress is high, by inserting grout and injecting the grout material, so it takes time to support the pillar material and wall material. Therefore, variations tend to occur in the insertion length of the upper end of the main reinforcement into the steel pipe joint, mortar injection, etc., and there are problems in construction efficiency, reliability, etc.

The present invention was developed to address the above-mentioned problems, and its purpose is to facilitate transportation and placement, and to improve the reinforcement arrangement and construction of column main reinforcement and wall axis reinforcement. To provide a precast reinforced concrete column material and a precast reinforced concrete wall material that have a degree of freedom, improve joint performance, construction performance, efficiency, and reliability of columns and walls, and enable labor saving and cost reduction.

[0006]

[Means for Solving the Problems] The present invention provides a method for burying a plurality of sheath pipes for column main reinforcement vertically at circumferential intervals in a hollow cylindrical precast concrete main body in which a large number of stirrups are buried. The precast reinforced concrete column material is constructed by installing reinforcement along the center of the sheathed pipe and constructing it at the middle lap joint of the column main reinforcement. A precast reinforced concrete wall material is constructed by burying sheathed pipes for wall shaft reinforcement vertically at intervals, and installing reinforcing bars along the center of the sheathed pipes to form the middle lap joint of the wall shaft reinforcement. In addition to transportation and placement, it also facilitates the construction and adjustment of column main reinforcement and wall shaft reinforcement, improving reliability in terms of construction efficiency, accuracy, etc.

[0007]

[Operation] The precast reinforced concrete column material is sheathed from above to the protruding part of each column main reinforcement on the floor and inserted into each sheath pipe to erect, and the column main reinforcement is inserted from the top of each sheath pipe to erect the column. By butting against the protruding part of the main reinforcement, and injecting grout into each sheath pipe, the main reinforcement of the column can be easily and strongly connected with high precision by each sheath pipe and the supporting reinforcement installed along the sheath pipe, or the precast reinforced concrete wall material is sheathed from above to the protruding part of each main wall reinforcement on the floor and inserted into each sheath pipe to build it up, and the wall axis reinforcement is inserted from the top of each sheath pipe and butted against the protrusion part of the wall axis reinforcement. By injecting grout into each sheath pipe, the wall shaft reinforcements can be easily and strongly connected with high precision by using the reinforcement bars installed along each sheath pipe, and columns and walls can be easily and accurately constructed. . The precast reinforced concrete column materials and wall materials do not have column main reinforcements or wall axis reinforcements buried, so they can be easily transported and placed at desired positions, and the main reinforcement arrangement and construction adjustments can be made freely. Constructed with high strength and precision.

[0008]

[Example] Figures 1 and 2 show examples of precast reinforced concrete column materials according to the present invention.
4 is a sheath pipe for column main reinforcements 9a, b, 5 is reinforcement reinforcement, 9a, b are column main reinforcements, and a large number of tie bars 3a,
A plurality of sheathed pipes 4 for column main reinforcements 9a, b are vertically penetrated at circumferential intervals and buried in the hollow cylindrical precast concrete main body part 1 in which pillars b and c are buried, and the central part of the sheathed pipes 4 is A precast reinforced concrete column material 10 is constructed in which reinforcement reinforcements 5 are installed along the middle overlap joints 4 and 5 of column main reinforcements 9a and b.

Further, FIGS. 3 to 5 show examples of precast reinforced concrete wall materials of the present invention, in which 11 is the precast concrete main body, 13a and 13b are vertical reinforcements,
In the plate-shaped precast concrete main body part 11 in which a large number of vertical and horizontal reinforcements 13a, b are embedded, horizontal reinforcements, 14 are sheath pipes, 15 are support reinforcements, 19a and 19b are wall axis reinforcements,
A plurality of sheath pipes 14 for wall shaft reinforcements 19a, b are vertically penetrated and buried at intervals, and reinforcement bars 15 are installed along the center of the sheath pipes 14 to form a middle overlap joint for wall shaft reinforcements 19a, b. Part 1
The precast reinforced concrete wall material 20 is made of 4, 15 parts.

[0010] The precast reinforced concrete column material 1
0 in detail, in a factory or the like, for example, in a steel formwork (not shown), a large number of tie bars 3a, b, c are arranged at vertical intervals, and a plurality of sheath pipes 4 are arranged at circumferential intervals. The sheath pipes 4 are arranged in a penetrating manner, and reinforcing bars 5 are arranged along the center of each sheath pipe 4. Concrete is placed in the formwork, and the whole is rotated together with the formwork by an appropriate means to absorb centrifugal force. Concrete is compacted and produced. The precast concrete main body part 1 is homogeneous, high density, high strength,
It is compact and formed into a hollow cylinder shape with a finished outer surface with a large hole 2 formed in the center, and each sheath tube 4
A grout injection hole and a discharge hole (not shown) communicating with the grout are also provided. Each sheath pipe 4 is vertically buried within the precast concrete main body 1 at circumferential intervals as shown in the figure.
The column main reinforcements 9a and 9b are penetrated from above and below so that they can be inserted, and the diameter, number, length, etc. of the support reinforcements 5 installed along the center are set appropriately to form a joint mechanism with the required strength. Ru.

[0011] The precast reinforced concrete column material 1
0 is for reinforced concrete rigid frame structures,
In addition to shaping, bending, and shearing the basic framework together with beam materials, floor materials, wall materials, etc., buckling resistance is also required when receiving axial force, and if the structure is relatively low-rise, the structure shown in Figure 2 (A) As shown in , the sheath pipe 4 and reinforcement bars 5 are reduced along with the cross-sectional area of the precast concrete main body 1, and the ties (shear reinforcing bars) consist of main ties 3a and sub ties 3b, and the structure is compared to In the case of a high-rise building, as shown in Fig. 2(B), the sheath pipe 4 and reinforcement bars 5 are increased along with the cross-sectional area of the precast concrete main body 1, and correspondingly, the stirrups are the main stirrups 3a and multiple Consisting of accessory stirrup muscles 3c, or Fig. 2
As shown in (C), a main stirrup 3a and a plurality of subsidiary stirrups 3b, 3
A tie bar consisting of c is applied and set to the required strength.

The above-mentioned precast reinforced concrete column material 10 is sheathed from above to the protruding part of each column main reinforcement 9a on the floor and inserted into each sheath pipe 4, as shown in FIG. The protrusion 9a is connected to each sheath tube 4.
It is inserted up to the center of the wall and erected with high precision using simple shoring. Next, the column main reinforcement 9b is inserted from the top of each sheath pipe 4, and grout is injected against the top of each column main reinforcement 9a. 9a and 9b are easily and strongly connected, and the pillar construction can be performed accurately and efficiently.

[0013] The precast reinforced concrete wall material 2
0, as shown in FIGS. 3 and 4, vertical bars 13a and horizontal bars 13b are buried at appropriate intervals in the precast concrete main body 11, and a plurality of sheath pipes 14 are buried vertically and penetratingly at intervals. As shown in FIG. 3(B), the diameter, number, length, etc. of the reinforcing bars 15 installed along the sheath pipe 14 are increased or decreased depending on the required strength, and as shown in the figure, the diameter, number, length, etc. Spiral muscles 16 are placed around the 15 groups of supporting muscles according to the
is reinforced by reinforcing it.

[0014] The above precast reinforced concrete wall material 2
As shown in FIG.
The protrusion part a is inserted and built, and placed with high precision using simple shoring, and the wall shaft reinforcement 19b is inserted into each sheath pipe 14.
The grout material is injected into each sheath pipe 14 from the grout injection hole 12, and the wall shaft reinforcements 19a, 19b are easily and strongly connected, and the wall construction is completed. can be easily constructed with high precision. In addition, the precast reinforced concrete column materials and wall materials have no protruding parts of the column main reinforcement or wall axis reinforcement, so they can be easily transported and installed at the desired position, and the arrangement of the main reinforcement and construction can be adjusted freely. and is constructed to the desired strength.

[0015]

[Effects of the Invention] The present invention consists of the above-mentioned configuration,
The precast reinforced concrete column material and the precast reinforced concrete wall material are easily transported and placed, sheathed from above to the column main reinforcement and wall axis reinforcement protrusion on the floor, and inserted into each sheath pipe and erected, By inserting column main reinforcements and wall axis reinforcements from the top of each sheath pipe and injecting grout into each sheath pipe, the columns and wall main reinforcements are strongly connected by each sheath pipe and the reinforcement bars running along it. The reinforcement arrangement and construction of the main reinforcement can be freely adjusted, and the joint performance of the main column reinforcement and wall shaft reinforcement, the construction performance of columns and walls, efficiency, and reliability are improved, and it has advantages such as labor saving and cost reduction. .

[Brief explanation of the drawing]

[Figure 1] Longitudinal cross section (A), enlarged view of main parts (B), and plan view (C) showing an example of precast reinforced concrete column material

[Figure 2] Case of low-rise reinforced concrete rigid frame structure (
Plan views of other examples of the same column materials in A), high-rise reinforced concrete rigid frame structures (B) and (C)

[Figure 3] Longitudinal cross section of an example of precast reinforced concrete wall material (A
), top view (B)

[Figure 4] A perspective view showing an example of the arrangement of the same precast reinforced concrete wall material.

[Figure 5] Explanatory diagram of the precast reinforced concrete wall material installed

FIG. 6 is an explanatory diagram of the state of construction of a conventional precast reinforced concrete wall.

[Explanation of symbols]

1-11 Main body of precast concrete

Claims (2)

[Claims] [Claim 1] A plurality of column main reinforcing sheath pipes are buried in a hollow cylindrical precast concrete main body in which a large number of tie reinforcements are buried, passing through them vertically at circumferential intervals, and the central part of the sheath pipes is A precast reinforced concrete column material characterized in that reinforcement bars are installed along the middle of the column main reinforcement at the middle lap joint. [Claim 2] A plurality of sheath pipes for wall shaft reinforcements are buried vertically through the main body part of the plate-shaped precast concrete in which a large number of vertical and horizontal reinforcements are buried, and the central part of the sheath pipes is embedded. A precast reinforced concrete wall material characterized in that a reinforcement is provided along the wall at the middle overlap joint of the wall axis reinforcement.