KR102625479B1 - Construction method using precast module with prestressing force - Google Patents

Abstract

The present invention relates to a construction method using a precast module in which a prestressing force acts. It allows column members and girder members manufactured in module form to be assembled on site, making it easy to transport and increasing loading efficiency, and reinforcing bars and girder members. It concerns a technology in which prestress is applied to ensure uninterrupted connection of tendons.
That is, the present invention includes the steps of manufacturing and preparing a column member and a girder member of a single shape, transporting the manufactured column member and girder member to the site, and installing the column member vertically. A step of forming a joint by mounting a girder member to be connected to one side of the column member at a certain distance from the side of the column member to form a joint, and connecting the tendons of the column member and the girder member exposed through the joint to each other. It is characterized by consisting of a step of installing a form at the joint, and a step of filling the form with concrete and hardening it.

Description

Construction method using precast module with prestressing force}

The present invention relates to a construction method using a precast module in which a prestressing force acts. It allows column members and girder members manufactured in module form to be assembled on site, making it easy to transport and increasing loading efficiency, and reinforcing bars and girder members. It concerns a technology in which prestress is applied to ensure uninterrupted tendon connections.

Concrete, which is generally used as a material for girders, is a state in which aggregates such as sand and gravel are mixed with water and cement and the aggregates are strongly bonded. It has the characteristic of withstanding compressive stress well, but when tensile stress occurs, the combined particles As they fall apart, they become unable to be re-adhered, making them very vulnerable to tensile stress.

Therefore, metallic steel is used to reinforce concrete with weak tensile strength. Representative examples include tendons that are installed to apply prestress to prestressed concrete.

In the prestress method using the tendon, a tendon is installed in a longitudinal direction on a concrete girder, and a mechanical tensile force is applied to the tendon placed externally to introduce prestress through the reaction.

However, in most structures where precast girders are applied, columns are installed vertically first, and precast girders are installed on both sides at the top of the column.

Therefore, the process of connecting the column and the girder necessarily occurs, and because a separation space must be formed between the girders structurally, prestress cannot be introduced to the tendons of horizontally connected girders at once, and must be applied to each girder separately. There is the inconvenience of having to introduce prestress.

In the case of continuous beams, the desirable shape of the tendon is to be installed in a gently curved form, and it should be located at the highest position near the pillars and at the lowest position between pillars. However, because it is very difficult for field workers to accurately adjust and install the position of the tendon, there is a need to provide the tendon with the position accurately positioned.

Registered Patent No. 10-1671124 (Prestressed concrete girder system for PSC spliced girder bridges and construction method of PSC spliced girder bridges using the same) Registered Patent No. 10-1300553 (Girder bridge equipped with PC tendons that can replace PC steel wires) Registered Patent No. 10-1614842 (Frame system for buildings using PC columns integrated with projecting beams applicable to various spans without increasing floor height)

The present invention was developed to solve the problems described above. The girder members and column members are provided in a modular form so that the joints can be easily connected in the field, making construction simple and ensuring seamless connection of reinforcing bars and tendons. The purpose is to provide a construction method using a precast module in which prestressing force is applied so that prestress can be applied.

In addition, the present invention allows the shape of the girder member and the column member to be in the form of a single shape, thereby increasing the loading efficiency, making it easy to transport, and making it possible to construct the column member long, so that the pre-stressing force acts to enable efficient construction. Another purpose is to provide a construction method using cast modules.

The present invention includes the steps of manufacturing and preparing a column member and a girder member in the shape of a single shape, transporting the manufactured column member and girder member to the site, and installing the column member vertically. , forming a joint by mounting a girder member to be connected to one side of the column member at a predetermined distance from the side of the column member, and connecting the tendons of the column member and the girder member exposed through the joint to each other; , installing a form at the joint, and filling the form with concrete to harden it.

In addition, in the step of manufacturing and preparing the column member and the girder member, the column member is disposed in a shape where the first tendon portion penetrates in the thickness direction, and a portion of the first tendon portion is exposed to the outside in the direction of the joint, and the girder The member is characterized in that the second tendon portion is disposed in a longitudinal direction and is manufactured with a portion of the second tendon portion exposed to the outside.

In addition, the second tendon part is composed of a curved path in the center and a straight path at both ends, and the straight path is exposed to the outside and connected to the first tendon part.

In addition, in the step of connecting the tendons to each other, the tendon connection method is characterized in that the tendons are connected through a coupler.

The present invention provides girder members and column members in a modular form so that joints can be easily connected in the field, making construction simple, and the connection of reinforcing bars and tendons is made seamless, allowing prestress to be applied overall, resulting in excellent structural effects. There is.

In addition, the present invention has the effect of allowing the girder member and the column member to have a linear shape, thereby increasing the loading efficiency, making it easy to transport, and enabling the column member to be constructed long, thereby enabling efficient construction.

Figure 1 is a block diagram showing a construction method using a precast module in which the prestressing force of the present invention is applied.
Figure 2 is a view showing the steps of manufacturing and preparing pillar members and girder members, respectively, in the construction method of the present invention.
Figure 3 is a diagram showing the step of vertically installing a pillar member in the construction method of the present invention.
Figure 4 is a view showing the step of forming a joint by mounting the girder member at a certain distance from the side of the column member in the construction method of the present invention.
Figure 5 is a diagram showing the steps of connecting tendons to each other in the construction method of the present invention
Figure 6 is a diagram showing the construction process using a support channel and a guide channel in the construction method of the present invention.
Figure 7 is a view showing the cross-sectional structure of the support channel and guide channel in the construction method of the present invention.
Figure 8 is a view showing the step of installing formwork at the joint in the construction method of the present invention
Figure 9 is a view showing the step of filling concrete into the form and hardening it in the construction method of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Also, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The construction method using a precast module in which the prestressing force of the present invention acts is a step (S1) of manufacturing and preparing a column member 100 and a girder member 200 in the shape of a (一) shape, respectively, as shown in FIG. 1. ), a step of transporting the manufactured pillar member 100 and the girder member 200 to the site (S2), a step of vertically installing the pillar member 100 (S3), and the pillar member 100 ) A step (S4) of forming a joint (A) by mounting the girder member (200) to be connected to one side at a certain distance from the side of the column member (100), and the column exposed by the joint (A) A step of connecting the tendon 300 of the member 100 and the girder member 200 to each other (S5), a step of installing a form at the joint (A) (S6), and filling the form with concrete and hardening it. It is characterized by consisting of step (S7).

The step (S1) of manufacturing and preparing the pillar member 100 and the girder member 200 is a process of manufacturing the girder member 200 and the pillar member 100 in the shape of a straight line at the factory. . The column member 100 and the girder member 200 manufactured in the above step are manufactured with the tendon 300 built in. A first tendon portion 310 is installed on the pillar member 100 and a second tendon portion 320 is installed on the girder member 200, respectively.

More specifically, as shown in FIG. 2, in the step (S1) of manufacturing and preparing the column member 100 and the girder member 200, the column member 100 has a first tendon portion 310 in the thickness direction. It is arranged in a form that penetrates the joint and is manufactured with a portion of the first tendon portion 310 exposed to the outside in the direction of the joint (A), and the girder member 200 has the second tendon portion 320 penetrating in the longitudinal direction. It is manufactured in a state where a portion of the second tendon portion 320 is exposed to the outside.

And, as shown in the drawing, the second tendon part 320 is composed of a central curved path 320a and straight paths 320b at both ends, and the straight path 320b of the second tendon part 320 is external. and is exposed to be connected to the first tendon portion 310 of the pillar member 100. As described above, the curved path 320a of the second tendon portion 320 is positioned at a lower position toward the center, and the straight path 320b is positioned at the highest position.

Then, the step (S2) of transporting the column member 100 and the girder member 200 to the site is a column manufactured with the first tendon portion 310 and the second tendon portion 320 embedded as described above. This is the process of transporting the member 100 and the girder member 200 to the site where construction is to be performed. During the transportation process, since the shape of the column member 100 and the girder member 200 is in the form of a single letter, a large amount can be loaded, and the column member 100 and the girder member 200 are loaded together. This allows efficient use of the loading space, and has the advantage that the length of the pillar member 100 can be made as long as possible to fit the loading space.

The step (S3) of vertically installing the pillar member 100 is a step of installing the pillar member 100 at the installation site as shown in FIG. 3. As shown in the drawing, the base module is first installed and then The pillar member 100 may be installed vertically on the top of the base module, or another pillar member 100 may be installed on another structure or on top of the pillar member 100.

At this time, the first tendon portion 310 of the column member 100 is exposed on the side in the direction in which the girder member 200 is coupled. That is, when the girder member 200 is connected to only one side of the column member 100, the first tendon portion 310 is exposed only on one side, and when the column member 100 is connected to both sides, the first tendon portion 310 is exposed. is exposed on both sides.

And in the step (S4) of forming the joint (A), as shown in FIG. 4, the girder member 200 to be connected to one side of the column member 100 is spaced at a certain distance from the side of the column member 100. to form a joint (A) between the girder member 200 and the column member 100. The joint (A) is a part that connects the column member 100 and the girder member 200 in the field. In order for the joint to be easily performed, the girder member 200 must be maintained at a certain distance while maintaining a horizontal state.

In order to mount the girder member 200 in this way, as shown in FIGS. 6 and 7, the column member 100 is attached in the direction of the joint A. "A support channel 500 of the shape is installed in advance, and is directed toward the joint (A) on one side of the girder member 200." It is desirable for the guide channel 600 to be stably mounted on the upper part of the support channel 500 by forming the guide channel 600 in the shape of ".

Therefore, the support channel 500 and the guide channel 600 must be manufactured integrally in the preparation step (S1), respectively, as shown in FIG. 2, and the support channel 500 and the guide channel 600 Some are fixed in the form of being inserted into the pillar member 100 and the girder member 200, and the remaining part is exposed to the outside.

As the support channel 500 and the guide channel 600 are provided on their own, the girder member 200 is stably supported and can be maintained in a horizontal state during the process of connecting the joint (A).

The step (S5) of connecting the tendons 300 to each other connects the first tendon portion 310 of the pillar member 100 and the second tendon portion 320 of the girder member 200, as shown in FIG. It is a process. At this time, it is preferable that the tendon 300 is simply connected through a coupler. Also, in this process, as shown in FIG. 6, the reinforcing bars 400 of the column member 100 and the girder member 200 can be connected to each other. The reinforcing bar 400, like the tendon 300, is formed integrally during the manufacturing process, and is exposed in the direction of the joint A to connect the exposed portions to each other. The rebar 400 may also be connected through a coupler or may be connected by a lap joint method.

When the connection of the tendon 300 is completed, a step (S6) of installing a form at the joint (A) is performed as shown in FIG. 8. After the form is installed, concrete is placed in the form as shown in FIG. 9. Concrete is filled through the filling and hardening step (S7). At this time, if concrete is filled with a plurality of molded protrusions 700 protruding in the direction of one joint A of the column member 100 and the girder member 200, the bonding force with the newly filled concrete can be further increased. The forming protrusions 700 are formed horizontally to have a high bonding force even under vertical load conditions, and are formed integrally during the manufacturing process of the column member 100 and the girder member 200.

When the concrete finally hardens, the form is removed and the PC slab is installed on the top of the girder.

In the above, the present invention has been described with reference to the above embodiments, but of course, various modifications are possible within the technical scope of the present invention.

S1 ~ S7: Construction method using precast modules subject to prestressing force
A: joint
100: Column member
200: Girder member
300: Tendon
310: 1st tendon part
320: 2nd tendon part
320a: curved path
320b: Straight path
400: rebar
500: Support channel
600: Guide channel
700: Molded protrusion

Claims (4)

A step (S1) of manufacturing and preparing a column member 100 and a girder member 200 in the shape of a single (一) shape, respectively, and a step of transporting the manufactured column member 100 and girder member 200 to the site. (S2), a step (S3) of vertically installing the pillar member 100, and a girder member 200 to be connected to one side of the pillar member 100 at a certain distance from the side of the pillar member 100. A step (S4) of forming a joint (A) by mounting it at a remote location,
A step (S5) of connecting the column member 100 exposed at the joint A and the tendon 300 of the girder member 200 to each other, a step S6 of installing a form at the joint A, It consists of filling concrete into the form and hardening it (S7),
In the step (S1) of manufacturing and preparing the column member 100 and the girder member 200, the first tendon portion 310 is disposed in the column member 100 in a form penetrating in the thickness direction, and the joint portion (A) is formed. A portion of the first tendon portion 310 is manufactured to be exposed to the outside, and the girder member 200 is disposed so that the second tendon portion 320 penetrates in the longitudinal direction. ) is manufactured with part of it exposed to the outside,
In the step S4 of forming the joint A, in the step of manufacturing and preparing the column member 100 and the girder member 200, the column member 100 is attached to the column member 100 in the direction of the joint A. "A support channel 500 of the shape is installed in advance, and is directed toward the joint (A) on one side of the girder member 200." " A pre-stressing force is applied, characterized in that a guide channel 600 in the shape is formed so that the guide channel 600 is placed on the upper part of the support channel 500 when forming the joint (A). Construction method using cast modules
delete According to clause 1,
The second tendon portion 320 is composed of a central curved path 320a and straight paths 320b at both ends, and the straight path 320b is exposed to the outside and connected to the first tendon portion 310. Construction method using precast modules with characteristic prestressing force
According to clause 1,
In the step (S5) of connecting the tendons 300 to each other, the method of connecting the tendons 300 is a construction method using a precast module on which a prestressing force is applied, characterized in that the tendons 300 are connected through a coupler.