KR20020086054A - The method of construction for fundamental formative of bent in under the water. - Google Patents

Abstract

PURPOSE: A method for constructing an underwater pier foundation is provided to prevent the mixing of water and concrete during the placing of concrete without a cofferdam, thus achieving uniform and high quality pier foundation structure. CONSTITUTION: In the construction method of an underwater pier foundation, reinforcing bar frames(2) are arranged in a state that an open caisson(1) is submerged in water(7), a bag(3) is interposed in a space between the reinforcing bar frames, and concrete is poured in the bag to fill an inner space of the caisson. Then, the concrete can be discharged into the inner space of the caisson by pulling a wire fastened to an opening of the bag, and the inner space of the caisson is able to be filled with concrete completely by removing the bag.

Description

The method of construction for fundamental formative of bent in under the water.

The present invention relates to the invention for the foundation of the bridge piers located in the water, in particular when the concrete is placed in the water without the clogging, the seawater or river fresh water and concrete is not mixed and the material is not separated It is about the invention to provide a bridge infrastructure.

In general, the well hole method is used for the foundation of the pier, and the well caisson is fixed at the position where the pier is to be installed, and the bottom of it (the sea bottom in the sea, the bottom of the river in the river) is excavated. The caisson is settled to a predetermined depth to excavate the soil inside, and the space is filled with concrete to be filled. However, when pouring concrete in water, the concentration of cement is diluted by mixing with seawater or fresh water. In order to prevent this problem, defects are caused by the weakening of the viscosity or the separation of concrete materials such as gravel, sand, cement, etc., in order to prevent this problem, an expensive admixture is added to the concrete and other underwater concrete. The technique is used a lot, but at shallow depths, you can simply hold the pilings by hitting piles of steel, In order to install the piers at the depth of water, a large number of large circular cells are manufactured separately on land, and they move to the place where the piers are to be installed by using a heavy seabed, etc., and the sand is filled inside. Then, the temporary barrier work was carried out, and the interior of the piers was built by creating a dry environment such as land by pouring out the water inside the temporary barrier work.

As described above, when concrete is poured in water, as the concentration of cement is diluted to decrease the slump, the strength is weak and the structure of the concrete foundation structure is not uniform. When installing the piers foundation using the construction method, water can be discharged to work in the environment such as land, so the strength of the foundation structure can be maintained. And it takes enormous air and air expenditure, and there is a problem that may cause danger in the high tidal wave and fast tidal current in the case of marine work.

1 is a state in which the sewage of the lower part of the well caisson is collected and submerged the well caisson below the ground surface

2 is an exemplary view showing a state in which the reinforcing bar reinforced in the well bucket

Figure 3 is a partial illustration of the load between the reinforcement skeleton and the reinforcement skeleton reinforced bag to be carried out according to the present invention

Figure 4 is a state diagram for opening the opening of some bags after drawing concrete for each bag carried out in accordance with the present invention and withdrawn to the upper side

5 is a state diagram of the well caisson of the concrete pouring completed by removing the bag carried out in accordance with the present invention

6 is a partial schematic view showing a state in which the binding line is tied to the bag to be implemented in accordance with the present invention

<Code Description of Main Parts of Drawing>

1. Well Cistern 2. Rebar Frame

3. Sack 4. Wrinkles

5. Opening 6. Concrete

7. Water 8. Knot

9. Binding line

The present invention is an invention devised to provide a high-quality pier foundation by preventing concrete from being mixed with water while concrete is placed in the water without the construction of temporary curtains, and is not diluted or separated by water. The configuration of the invention will be described below with reference to the accompanying drawings.

As shown in the drawing, the sewage well caisson (1) made separately is settled in the seabed or in the bottom of the position where the foundation of the pier is to be set up, and the soil of the lower part is crushed by blasting, and then the cram shell and Repeat the pumping operation using pressure water, etc. to lower the well caisson 1 to a predetermined depth, and when the positioning work of the well caisson 1 for the foundation foundation is completed, The produced reinforcing bar frame 2 was placed vertically in the well caisson 1 and placed in the space between the transverse bar 2a and the longitudinal bar 2b of the set bar frame 2, respectively. The invention is made of a sack, etc., and the bag 3 of the same length as the well caisson (1) depth is charged in the up and down direction, wherein the bag 3 is not tearing well and durable Made of materials such as fibers, It is a little longer than the length from the upper side to the bottom side of the well caisson (1) and slightly wider than the width of the horizontal rebar (2a) and the vertical reinforcing bar (2b), but a hollow hemp can be inserted between the reinforcing bar frames (2). At the time, it is inserted between the reinforcing bars in the longitudinal direction in the state where the wrinkles 4 are made so that the charging is easy, and the opening part 5 is pulled out at the top end of the bottom side and the end is easily pulled from the upper side. The bag 3 which is sealed by the binding line 9 with a well-known knot (the same knot as the rice wine bag end sealing part) 8, and extends the binding line 9 to the upper side of the well caisson 1 above. If a plurality of bags 3 of such a structure are inserted, and then the concrete 6 is poured through the opening of the tip of the bag 3 for each bag 3 inserted as above, the bag 3 From the lower side of the bag, the concrete (6) in the bag (3) is filled in the bag (3). The water 7 in the well caisson 1 is pushed upward by the pressure, the water 7 is discharged to the outside of the well caisson 1 by the pressure. When placing the concrete 6 in each bag 3, almost no water 7 remains in the well caisson 1 by the expanded bag 3, and at the bottom end of the bag 3, The bottom end of the bag (3) is opened by pulling each sealed line 9 above the well caisson (1), so that only the concrete (6) filled in the bag (3) is inside the well caisson (1). When the bag (3) with the opening (5) is opened to the upper side of the well caisson (1) to take out, the withdrawal while forcibly injecting a large pressure between the bag (3) and the bag (3) The concrete of the underwater piers carried out according to the present invention by making it easier to withdraw The base part is to be formed.

As described above, the present invention forms a foundation for the pier in the water state with water 7 without constructing the temporary curtain, thereby preventing the enormous work force, aerobics, and waste of air due to the temporary barrier, and expensive admixtures. Since it is possible to significantly reduce the construction cost since no addition, etc., the viscosity due to the decrease in the concentration of cement due to mixing with the water (7) does not decrease, or the separation of concrete (6) materials such as gravel, sand, cement, etc. does not occur, The structure of the concrete foundation has the effect of forming a bridge foundation having uniform and necessary strength.

Claims (1)

In the underwater piers foundation forming method in which concrete (6) is poured while water (7) is stored inside the well caisson (1), each of the reinforcing bars (2a) and the longitudinal bars of the reinforced steel frame (2) A separate bag 3 is charged in each space between the reinforcing bars 2b, and the concrete 6 is poured into the loaded bag 3, and when the concrete 6 is poured to a predetermined height, the bag is bound with the bag 3 Pull each tie line (9) is made to let the concrete (6) is discharged into the well caisson (1), the bag (3) is made of a material such as durable synthetic fiber, well caisson (1) It is slightly longer than the length from the upper side to the bottom side, and has a width slightly wider than the space width between the longitudinal reinforcing bars 2b and the longitudinal reinforcing bars 2b, and has an pleat 4 with an opening 5 at the bottom end thereof. When the tie line 9 with the end is drawn out, the tie line is sealed with a knot 8 to easily loosen the tie line 9. Underwater piers foundation forming method by extending one end to the upper side of the well caisson (1).