KR20140100800A - Method for manufacturing prestressed precast concrete segment built-up beam with long span and construction method of precast concrete structures - Google Patents

Abstract

The present invention relates to a method of manufacturing an elongated span prestressed precast concrete beam in which segments manufactured by segmenting in the width direction and the longitudinal direction are integrated by introducing post tension in the field, A method of constructing a precast concrete structure using a cast concrete beam is disclosed.
A method of manufacturing a split span span prestressed precast concrete beam according to the present invention is a method of manufacturing a long span beam having an entire length L in cross section of width b and height h, Fabricating four segments having a half length of the entire length; In the section of each segment, a first prestressing material is installed in a sheath tube provided in the lengthwise direction, and a primary prestressing material is tensioned and fixed, thereby introducing a prestressing so that two assemblies longitudinally combined so as to have a total length L Fabricating a segment; And mounting the two assembly segments on the column using both heavy equipment and fastening the bolts at regular intervals along the longitudinal direction of the assembly segments so as to pass through the two assembly segments.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a precast concrete precast concrete structure and a method of manufacturing precast concrete precast concrete,

The present invention relates to a long span precast concrete beam and a precast concrete structure into which a prestress is introduced. More particularly, the present invention relates to a long span precast concrete beam and a precast concrete structure, Span prestressed precast concrete beam, and a method of constructing a precast concrete structure using the long span prestressed precast concrete beam manufactured according to this manufacturing method.

Concrete can be divided into on-site concrete beam and precast concrete beam depending on the time of concrete pouring. If the beam is made of precast concrete, there is no need for formwork and tile, which is a material for making beams in the field, and the period required for concrete curing is not needed, and it is possible to work without being influenced by weather conditions.

In recent years, long - span beams have been developed and actively applied to eliminate internal pillars for the purpose of increasing the variability of space and improving the convenience of remodeling. A method of introducing a prestress as one of the methods for making a precast beam into a long span is known.

There are two types of prestressing methods, one is pre-tensioning and the other is post-tensioning. In the pretensioning method, the concrete is placed in a prestressed state before the concrete is hardened, and after the concrete reaches the predetermined strength, the prestress is introduced into the concrete member by cutting the tension member. In the post tensioning method, And then the prestress is inserted into the concrete member by tensioning the tension member after inserting the tension member into the sheath tube embedded in the concrete in advance.

The pre-tensioning method is generally suitable for mass production of precast members in a factory. The post-tensioning method is suitable for manufacturing precast members in accordance with a specific site in a manufacturing site established near the site or for enhancing the load- It is known that it is suitable for introducing a prestress into a prism.

If the structure is pre-tensioned, there is a disadvantage in that a slip occurs in the tension member, so that the tension force is not effectively introduced into the end portion of the member, and in the case of the post tension method, a separate fixing device is required to fix the tension member.

On the other hand, when a prestressed precast concrete beam is introduced to a long span by a prestressing method, there is a problem that it can not be transported to a vehicle by the related laws such as the road law, The capacity of both heavy equipment needs to be increased, resulting in an increase in construction cost.

In terms of making the beam into a long span, the technology to be a background of the present invention is the patent registration No. 1148546 entitled " Steel frame for long span and steel frame using the same. &Quot; This patent discloses a long-span beam that can be applied to steel-frame structures that are flat-shaped and have modular members such as apartment-type factories, distribution centers, self-propelled spear windows. The assembly steel frame for a long span as disclosed in this patent is characterized in that both end members have a smaller dancing than the dancing of the end members and have a central member coupled between the end members, And a plurality of stubs coupled to each other with an interval therebetween at an upper portion of the member.

In terms of long-spaning precast members, the technology of the present invention is patented No. 1178168 entitled " Long span high-load aisle slabs for buildings ". This patent relates to an air-conditioned slab for constructing a building such as an underground parking lot, a public facility including an underground storage tank, or a public house, and is a plate-shaped slab embedded with styrofoam in the inner space of the panel, The lower stepped portion protruding downward is formed to be supported by the PC girder while protruding at a lower height than the previous ribbed slab, so that the floor height is increased to enlarge the effective space And the seismic performance due to the reduction of the weight of the entire building is advantageous.

Although the technique of making long span of precast concrete slabs is relatively active, there has been no technology developed to make long span of precast concrete beams. Until now, it is common to apply steel beam or composite beam as an alternative to long span of precast concrete beam. Steel beam and composite beam for various long span have been developed for this purpose.

Patent Registration No. 1148546 "Assembly steel beam for long span and steel frame using the same" Patent No. 1178168, "Long span high-load aisle slab of a building"

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing precast concrete beams for long spans.

Specifically, it is possible to manufacture a prestressed precast concrete beam for a long span that can be transported to a vehicle without being restricted by the relevant laws such as the Road Law, even when the factory is manufactured so that the prestressed concrete can be introduced into the long span by introducing the prestressed concrete beam .

It is another object of the present invention to provide a method of manufacturing a prestressed precast concrete beam for an elongated span which can be manufactured without increasing the capacity of both heavy equipment even when it is manufactured at a site near the site.

Another object of the present invention is to provide a method of constructing a precast concrete structure suitable for a warehouse, a large store, a factory or a parking lot by applying a prestressed precast concrete beam for a long span.

A method of manufacturing a split span span prestressed precast concrete beam according to the present invention is a method of manufacturing a long span beam having an entire length L in cross section of width b and height h, Fabricating four segments having a half length of the entire length; In the section of each segment, a first prestressing material is installed in a sheath tube provided in the lengthwise direction, and a primary prestressing material is tensioned and fixed, thereby introducing a prestressing so that two assemblies longitudinally combined so as to have a total length L Fabricating a segment; And mounting the two assembly segments on the column using both heavy equipment and fastening the bolts at regular intervals along the longitudinal direction of the assembly segments so as to pass through the two assembly segments.

At this time, a shearing protrusion may be formed on one of the two marginal segments of the two segments connected in the longitudinal direction, and a shearing groove may be formed on the other marginal segment of the other segment, into which the shearing protrusion is inserted.

A method of constructing a precast concrete structure according to the present invention comprises: laying a precast concrete column at a predetermined position according to a plan plan; Mounting two assembly segments on the column; Assembling the two assembled segments by joining the bolts at regular intervals along the longitudinal direction so as to penetrate the two assembled segments to form a split-assembled long-span prestress precast concrete beam; Installing a floor slab in a direction perpendicular to the longitudinal direction of the beam between split-assembled long-span prestressed precast concrete beams disposed parallel to each other; Placing topping concrete on top of the bottom slab; And installing a secondary tensile material in a sheath tube provided in the longitudinal direction of each of the two assembled segment sections after the topping concrete is cured and tentering and fixing the secondary tensile material to introduce the secondary prestress.

The split-type long-span prestressed prestressed concrete beam 10 manufactured according to the present invention can be used in both span construction without increasing the capacity of both heavy equipment even when applied to a span span structure having a height of 20 m or more, It is possible to greatly reduce the cost of pouring, which has the greatest effect on the construction cost during construction.

According to the present invention, there is an effect that the cross section of the beam can be effectively constituted by introducing the prestress introduced into the split-assembled long-span prestressed precast concrete beam stepwise.

The present invention has the effect of significantly reducing the construction cost compared with the existing composite type when applied to the construction of the passage space of the long span in a building such as a warehouse, a large store, a factory or a parking lot.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a method of manufacturing split-type long-span prestressed precast concrete beams according to the present invention.
2 is a perspective view showing the inside of the assembled segment according to the present invention.
3 is a perspective view for explaining a joint between two segments when constructing an assembled segment according to the present invention.
FIG. 4 is a perspective view illustrating a method of constructing a precast concrete structure using a split-type long-span prestressed precast concrete beam according to the present invention.
5 is a perspective view illustrating an example of a precast concrete structure to which the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

FIG. 1 is a view for explaining a method of manufacturing a split-type long-span prestressed precast concrete beam according to the present invention, and FIG. 2 is a perspective view showing the inside of the assembled segment according to the present invention.

As shown in FIG. 1, in order to manufacture a split-assembled long-span prestressed prestressed concrete beam according to the present invention, a long span screen is divided and segmented in units of segments to increase the capacity without increasing the capacity of both heavy equipment. do.

In order to fabricate an elongated span beam having an entire length L in the cross section of width b and height h shown in Fig. 1 (a), first, as shown in Fig. 1 (b) Four segments 111, 112, 121, and 122 having a 1/2 length are fabricated. It is also possible to constitute two segments in the longitudinal direction only in the longitudinal direction. However, in the present invention, the segments are divided into two in the width direction and are divided into four segments in total.

As shown in FIG. 1 (c), the four-segmented segments are installed in the sheath tube 131 provided in the longitudinal direction at the lower portion of each segmental cross-section as shown in FIG. 1 (c) ) Are integrally incorporated in the longitudinal direction so as to have a total length L by introducing a prestress by tension-fixing. The two assembled segments 11 and 12 thus assembled to have a total length L of ½ of the overall width are mounted on the column using both heavy equipment, and then, as shown in FIG. 1 (d) The bolts 140 arranged at regular intervals along the longitudinal direction of the assembled segments 11 and 12 are passed through the assembly segments 11 and 12 to be joined.

The floor slab 30 is placed on the split-type long-span prestressed concrete precast concrete beam 10 having a total width and an overall span length, and then the topping concrete 40 is placed thereon. The split-assembled long-span prestressed precast concrete beam 10 is integrated with the column 20 and the bottom slab 30 integrally.

In other words, in the longitudinal direction, a prestress is introduced and assembled before the column is mounted, the column is mounted on the column in the width direction, and then joined through the through bolts, and the topping concrete is integrally incorporated in the width direction.

The split-type long span prestressed prestressed concrete beam 10 according to the present invention thus manufactured is applicable to a span span structure having a height of 20 m or more, it is possible to perform both work without increasing the capacity of both heavy equipment, It has a merit that it can greatly reduce the cost of piling which has the greatest influence on the construction cost when constructing the structure.

3 is a perspective view for explaining a joint between two segments when constructing an assembled segment according to the present invention.

As shown in Fig. 1C, in order to increase the joint strength at the joint portion when the assembly segment 11 is formed by incorporating the two segments 111 and 112 in the longitudinal direction by introducing the prestress in the post-tensioning manner, A shear protrusion 111b is formed on one of the hemispherical surfaces 111a of any one of the two segments 111 and 112 connected in the longitudinal direction as shown in FIG. The rear surface 112a is formed with a front end groove 112b into which the front end protrusion 111b is inserted.

Therefore, when the two segments 111 and 112 are integrally combined in the longitudinal direction, the shear protrusion 111b is inserted into the front end groove 112b, so that the resistance against the shear at the joint between the segments 111 and 112 is greatly improved. Epoxy resin or high-strength mortar can be injected into the joint between the two segments 111 and 112 to increase the bonding strength.

FIG. 4 is a perspective view illustrating a method of constructing a precast concrete structure using a split-type long-span prestressed precast concrete beam according to the present invention.

First, as shown in FIG. 4A, the precast concrete column 20 is installed at a predetermined position according to the plan plan.

Then, as shown in FIG. 4B, two assembly segments 11 and 12 are mounted on the column 20. FIG. As shown in FIG. 1C, the two assembled segments 11 and 12 are formed by tightly fixing the primary tensile members 130 disposed in the segment section in the post-tensioning manner to introduce a prestress, And they are integrally combined in the longitudinal direction so as to have a half of the entire width.

Next, as shown in FIG. 4C, the bolts 140 are tightened at regular intervals along the longitudinal direction so as to penetrate the two assembly segments to join the two assembly segments 11 and 12 together, Thereby forming a precast reinforced concrete beam 10.

Subsequently, as shown in Fig. 4D, a floor slab 30 is installed in a direction perpendicular to the longitudinal direction of the beam 10 between the split and assembled long span prestressed precast concrete beams 10 arranged in parallel to each other do. As the floor slab 30, any precast concrete slabs known in the art can be applied.

Next, as shown in FIG. 4E, the topping concrete 40 is installed on the upper surface of the bottom slab 30. Accordingly, the bottom slab 30, the column 20, and the split-assembled type long span prestressed precast concrete beam 10 are structurally integrated.

Finally, as shown in FIG. 4F, after the topping concrete 40 is cured, a secondary prestress is introduced into the two assembly segments 11 and 12 through the secondary tensile members 150, respectively. As shown in FIG. 2, a sheath tube 151 is installed at an upper portion of the cross section along the longitudinal direction before the fabrication of the segments 111, 112, 121, and 122 to dispose the second tension member 150.

When the above-described construction is made, the split-type long-span prestressed prestressed concrete beam 10 according to the present invention is provided with the first prestress introduced when the segments are longitudinally combined, the topping concrete 40 is hardened, A second prestress is introduced before it is loaded. The primary prestress improves the resistance performance against load during construction by combining the segments in the longitudinal direction, and the secondary prestress improves the resistance performance against live load after construction. In the present invention, there is an advantage that the cross section of the beam can be effectively constituted by gradually introducing the prestress introduced into the split-assembled long-span prestressed precast concrete beam 10.

5 is a perspective view illustrating an example of a precast concrete structure to which the present invention is applied.

As shown in FIG. 5, the present invention is characterized in that the space (S1) for loading articles or parking the vehicle and the passage space (S2) for providing the moving path of the vehicle are divided, (S2) of a long span in a building such as a logistics warehouse, a large store, a factory or a parking lot where it is necessary to secure a wide passage space (S2) Compared to the existing composite beam format, the construction cost can be greatly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: Split assembled long span prestressed precast concrete beam
11, 12: Assembly segment
111, 112, 121, 122:
130: Primary tension
131: She tube
140: Bolt
150: Secondary tension
151: She tube
20: Column
30: floor slab
40: Topping concrete

Claims (3)

A method of manufacturing a long span beam having an entire length L in cross section of width b and height h,
Fabricating four segments (111, 112, 121, 122) having a half length of the entire width and a half length of the entire length;
The primary tension member 130 is installed in the sheath tube 131 provided in the longitudinal direction in each segment section and the primary tension member 130 is tensioned and fixed to introduce a prestress so that the entire length L is reduced to 1/2 Assembling two assembled segments (11, 12) in the longitudinal direction; And
The two assembly segments 11 and 12 are mounted on the column using both heavy equipment and the bolts 140 are fixed at regular intervals along the longitudinal direction of the assembly segments 11 and 12 to pass through the two assembly segments 11 and 12 And joining the first and second span prestressed prestressed prestressed concrete members to each other. The method according to claim 1,
Shear projections 111b and 121b are formed on one of the hemispherical faces 111a and 121a of one of the segments 111 and 121 of the two segments 111 and 112 (121 and 122) And a front end groove 112b (122b) into which the front end protrusion 111b (121b) is inserted is formed on one of the hemispherical surfaces 112a and 122a of the segments 112 and 122 of the segment 112. [ A method for manufacturing a precast concrete. Laying a precast concrete column (20) at a predetermined location according to a plan plan;
Mounting two assembly segments (11, 12) on the column (20);
The bolts 140 are fastened at regular intervals along the longitudinal direction so as to penetrate the two assembly segments to join the two assembly segments 11 and 12 together to form the split assembly type long span prestressed precast concrete beam 10 Comprising;
Installing a floor slab (30) in a direction perpendicular to the longitudinal direction of the beam (10) between split and assembled long span prestressed precast concrete beams (10) arranged in parallel to each other;
Placing a topping concrete (40) on an upper surface of the floor slab (30); And
After the topping concrete 20 is cured, the secondary tension member 150 is installed in the sheath tube 151 installed in the longitudinal direction of the two assembly segments 11 and 12, respectively, and the secondary tension member 150 is tensioned and fixed And introducing a second prestress into the pre-cast concrete structure.

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