JP2936130B2 - Construction method of steel frame concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete structure, and more particularly, to the construction of a concrete structure used for a marine harbor structure such as a breakwater, a quay, a floating pier, a floating airport in a relatively deep water area. It is about the method.

[0002]

2. Description of the Related Art Conventionally, concrete structures have been used as structures such as seawalls, breakwaters and breakwaters used in coastal areas. This concrete structure is often constructed as a floating structure in other areas due to problems such as shortened construction period and work environment at the site, and is often towed to the site.

[0003] That is, this concrete structure is constructed as a box having an internal steel girder as a framing material inside, a reinforcing bar is arranged on the bottom slab and side walls, and concrete is cast and built. This concrete casting is usually started from the bottom slab and is performed sequentially toward the upper part of the side wall.

[0004]

However, the conventional method for constructing a concrete structure has an essential problem.
That is, in the side wall to be cast around the internal steel girder, the height of one cast is at most 3 to 4 due to the concrete curing.
Because it is limited to 4 m, the height more than that, for example, 15 to
In the case of constructing a concrete structure of about 20 m, it is necessary to repeat the steps of arranging reinforcing bars, placing concrete, and curing concrete. In addition, this concrete curing requires a period of one to two weeks, and since this process is repeated, the construction period is prolonged. This significantly reduces the use efficiency of the dock when building it inside the dock, for example.

In particular, recently, there is a demand for a large-sized concrete structure having a height of 15 to 30 m. Therefore, it is desired in the industry to develop a method of constructing a concrete structure capable of shortening the construction period. I have.

[0006]

SUMMARY OF THE INVENTION The present invention was made to solve the problems of the prior art, internal steel
Concrete can be poured on the girder surface once in the vertical direction
Concrete structure with a long concrete wall than the height
A method of constructing a structure, where multiple internal steel girders are made
In both cases, the length corresponding to the height of the concrete structure is
Hold multiple long prestressed concrete slabs in a horizontal
Manufacturing process, and laying the bottom plate reinforcement on the gantry,
A step of pouring the concrete, the said bottom plate on Reinforcement
Erecting the internal steel girders at predetermined intervals;
The steel girder is used as a support member ,
The process of placing and placing the prepared prestressed concrete slab
And the reinforcing steel of each prestressed concrete
A step of concatenating the digits flop which is further fixed to the inner steel girder
Place concrete between the rest concrete plates ,
And the Presto concrete version as engineering be integrally formed
And a method of constructing a steel-framed concrete structure comprising:

[0007]

[Operation] According to the method for constructing a steel-framed concrete structure of the present invention, the side wall constituting the concrete structure is formed by the following method.
Flop les having a length corresponding to the height of the concrete structure
Stretched concrete slab (prestressed concrete slab
Abbreviated name), and this prestressed concrete slab is cast once
It is manufactured separately as a prestressed concrete plate in a horizontal state so that it is completed in the process . Then, a prestressed concrete plate is provided so as to cover the periphery of the internal steel girder as a supporting member.

Accordingly, there is no limitation due to the height of the concrete slab, so that the concrete curing period can be shortened, the production arrangement of the internal steel girders, etc., and the construction period can be made at the same time.
The construction period can be significantly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method of constructing a steel-framed concrete structure according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a part of a steel-framed concrete structure 2 disposed for revetment of a landfill 1 in a cutaway view. The steel-framed concrete structure 2 is a foundation rubble 4 laid on a seabed 3. The structure is provided with a concrete side wall 6 having a reinforcing bar around an internal steel girder 5, a bottom slab (not shown), and a superstructure 7 at an upper portion. In addition, the partition 8 is provided as needed.

The steel-framed concrete structure 2 is constructed by a dry dock or the like, and is towed and laid down at the installation site, that is, a landfill. In the step of constructing the concrete structure 2, as shown in FIG. 2, the bottom slab arrangement 10 is performed in a dock or on a gantry 9 provided on a ground 13 on which the concrete structure 2 can be launched. Then, the bottom slab concrete 11 is poured into the bottom slab arrangement 10 as shown in FIG. 3 to complete the bottom slab.

According to the present invention, there is provided a method in which concrete is poured short in the height direction and cured as in the prior art.
Adopt a sequential placement method to make a concrete slab (concrete wall) of a predetermined height while repeating curing several times .
Instead, a long prestressed concrete slab divided in the height direction according to the height of the wall of the building is produced in a single casting in a horizontal state, and this is made using a crane. It is characterized in that it is assembled so as to be attached around the internal steel girder 5.

Therefore, various prestressed concrete slabs are produced around the bottom slab concrete 11 or at another place, or the produced slabs are carried in. FIG.
Shows an example of this, in which a side wall concrete plate 6a, an end wall concrete plate 6b and the like are integrally manufactured in a horizontal state. The internal steel girder 5 has a flange portion 5a around its periphery as shown in FIG.
6 are protrudingly provided. Further, as shown in FIG. 5, a reinforcing bar 17 is provided to protrude to the side of each of the concrete plates 6a and 6b.

When each prestressed concrete slab is manufactured in a horizontal state as described above, the internal steel girders 5 are arranged at a predetermined interval (a) in the upper central portion of the bottom slab concrete 11, as shown in FIG. The internal steel girders 5 are connected to each other by the joining material to form a frame-shaped structure. This space (a) is formed to have a width slightly larger than the width (b) of the side wall concrete slab 6a.

The prestressed concrete slab, which is produced by casting concrete while placed horizontally, means that it can be applied to members which cannot be cast in a plurality of times in the prior art. It is acceptable to manufacture a small-scale prestressed concrete plate by employing the conventional technology. Next, as shown in FIG. 6 and FIG. 7, the internal steel girders 5 planted on the bottom slab concrete 11 are used as internal structural members, and the side wall concrete slabs 6a and the end wall concrete slabs 6b are successively provided so as to cover the surfaces thereof. It is arranged on the flange portion 5a of the steel girder 5, and large-scale assembly of a precast concrete slab made of reinforced concrete or prestressed concrete is performed. As shown in FIG. 7 to FIG. An assembling process such as introduction of prestress is performed.

Next, in order to connect the side wall concrete slab 6a and the end wall concrete slab 6b to form an integrated structure, a joint concrete 18 (FIG. 7) is cast.
C tension is applied to the PC steel wire 17, and the concrete structure 2 is completed. The large steel frame concrete structure 2 was completed in the dock or the like by the above-described process. In this case, the concrete structure 2 was floated by pouring water into the dock and towed to the installation place.
It is laid on the rubble 4 shown below, and the subsequent work is performed to complete the reclamation work.

[0016]

The method for constructing a steel-framed concrete structure according to the present invention provides a method for constructing a steel frame concrete on the surface of an internal steel girder once in the vertical direction.
A concrete wall longer than the height where cleats can be cast
A construction method Yu to the concrete structure, a plurality of
Co When fabricating the internal steel girder, of the concrete structure
A plurality of long pre Sutokon having a length corresponding to the height
The process of manufacturing the cleat plate in a horizontal state and the bottom
Laying slab arrangements and placing bottom slab concrete;
Planting at intervals of the internal steel girder to Jo Tokoro on the bottom plate on the reinforcement
Erecting, and the surface of the internal steel girder as a support member
The prestressed concrete plate manufactured in the horizontal state
And placing each of the prestressed concrete
A step of connecting the plate of rebar in the internal steel girder, further within said
Between the prestressed concrete slabs
The cleat was pouring, the Presto concrete version of one
And a step of forming physically .

Therefore, the prestressed concrete slab of the side wall constituting the steel frame concrete structure is manufactured in advance in a horizontal state, so that the height of the prestressed concrete slab is not limited, and the concrete curing period can be shortened. Since the concrete plate and the internal steel girder constituting the support member can be manufactured at the same time, the construction period can be significantly reduced.

Since the prestressed concrete slab is manufactured in a horizontal state, it is possible to manufacture a considerably long object, and to manufacture a prestressed concrete slab having excellent dimensional accuracy and excellent strength. And a steel-framed concrete structure using the same can have excellent durability.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a concrete structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a step of reinforcing bar arrangement.

FIG. 3 is a perspective view showing a concrete slab or a concrete block attached to an inner steel girder centered thereon.

FIG. 4 is an enlarged perspective view showing a part of an internal steel girder.

FIG. 5 is a perspective view showing an enlarged structure of an edge portion of the concrete slab.

FIG. 6 is an explanatory view of a process of assembling a concrete structure.

FIG. 7 is a perspective view showing a completed concrete structure.

FIG. 8 is a diagram showing a part A of FIG. 7;

FIG. 9 is a diagram showing a portion B in FIG. 7;

FIG. 10 is a diagram showing a part C in FIG. 7;

[Explanation of symbols]

1 landfill 2 steel frame concrete structure 4
Ripped stone 5 Internal steel girder 5a Flange part 6 Concrete side wall 6a Side wall concrete plate (pressed concrete plate) 6b End wall concrete plate (pressed concrete plate) 7 Superstructure 8 Partition wall 9 Stand 10 Bottom plate reinforcement 11 Bottom concrete 13 Ground 14 Stud 15 Reinforcing bar 16 Sheath 17 PC steel wire 18 Concrete joint

Continuation of the front page (56) References JP-A-59-41515 (JP, A) JP-A-50-59812 (JP, U) JP 5-29237 (JP, Y2) (58) Fields investigated (Int) .Cl. ⁶ , DB name) E02D 5/30 E02B 3/06 301 E02D 5/10

Claims (1)

(57) [Claims] (1) A single vertical contact with the surface of an internal steel girder.
The long concrete wall than the height to cut the cleats in the pouring
A construction method of the concrete structure having a plurality of
While manufacturing the internal steel girder,
Several long prestocons with a length equivalent to the height
Bottom cleats plate, a step of manufacturing work in a horizontal state, on to the frame
Laying slab arrangements and placing bottom slab concrete ;
The internal steel girders are planted at predetermined intervals on the bottom slab reinforcement.
A step of standing, the surface pre SL internal steel girder as support members
The prestressed concrete plate manufactured in the horizontal state
And placing each of the prestressed concrete
A step of connecting the reinforcing bars of the plate to the inner steel girder, further in the
Between the prestressed concrete slabs
And Da設the cleat, the Presto concrete version of one
A method for constructing a steel-framed concrete structure comprising the steps of physically forming .