Variable assembly PC member

1. A variable assembly precast concrete (PC) member comprising:

a plurality of hollow PC modules, each hollow PC module which has an upper flange and a lower flange spaced apart from each other, and a pair of webs connecting both ends of the upper flange and the lower flange to form a hollow therein; and

connectors connecting the plurality of hollow PC modules with each other in the width direction,

wherein a plurality of steel bars are provided on the upper flange and the lower flange of the hollow PC module in the width direction of the hollow PC module, and the connectors connect the steel bars of the neighboring hollow PC modules with each other, and

wherein each connector comprises:

a coupler coupled to an end portion of one side of each steel bar;

a headed bar of which one end is coupled to the coupler and another end has an expanded head;

a socket of which one end is coupled to an end portion of another side of the steel bar and another end has a receiving space for receiving the expanded head of the headed bar; and a

fixing cap coupled to the receiving space of the socket to press the expanded head of the headed bar.

2. The variable assembly PC member according to claim 1 , wherein a PC steel wire is disposed to penetrate through the upper flanges and the lower flanges of the plurality of hollow PC modules so as to apply post tension.

3. The variable assembly PC member according to claim 2 , wherein non-shrinkage mortar is filled between the webs of the neighboring hollow PC modules.

4. The variable assembly PC member according to claim 3 , wherein a shim plate is provided around the PC steel wire between the webs of the neighboring hollow PC modules.

5. The variable assembly PC member according to claim 4 , wherein magnets are provided on the web around the PC steel wire of one hollow PC module, and the shim plate is attached to the magnets to fix the position.

6. The variable assembly PC member according to claim 4 , wherein the shim plate is formed long in the longitudinal direction of the hollow PC module, and a through hole through which the PC steel wire penetrates is formed at the position of the PC steel wire.

7. The variable assembly PC member according to claim 3 , wherein a groove portion is formed on the outside of the web of the hollow PC module in the longitudinal direction of the hollow PC module, and a water stop protruding into the groove portion is disposed on the web in the longitudinal direction of the hollow PC module.

8. A variable assembly precast concrete (PC) member which is a PC slab in which cast-in-place concrete is not placed, the variable assembly PC member which is formed by a plurality of hollow PC modules of a rectangular cross section connected in the width direction, each hollow PC module comprising an upper flange, a lower flange, and a pair of webs connecting both ends of the upper flange and the lower flange, and having a hollow formed therein,

wherein steel bars are respectively disposed inside the upper flange and the lower flange of the hollow PC module in the width direction of the hollow PC module and an end portion of each steel bar is exposed to a first pocket portion formed at one side end of the upper and lower flanges, and the steel bars of the hollow PC modules abutting in the width direction are connected to each other by a connector inside the first pocket portion, and non-shrinkage mortar is filled between the neighboring hollow PC modules,

wherein both end portions of the hollow PC module are joined to a side surface of a first girder disposed at a longitudinal end portion, and

wherein the hollow PC module located at an outermost position of the variable assembly PC member is rigidly connected to a fixed steel bar, which is embedded in a second girder disposed at a widthwise end portion of the variable assembly PC member, by the connector.

9. The variable assembly PC member according to claim 8 , wherein the connector comprises:

a coupler coupled to an end portion of one side of the steel bar;

a headed bar of which one end is coupled to the coupler and another end has an expanded head;

a socket of which one end is coupled to an end portion of another side of the steel bar and another end has a receiving space for receiving the expanded head of the headed bar; and

a fixing cap coupled to the receiving space of the socket to press the expanded head of the headed bar.