KR20030003147A - Piles and Footing Construction Method Using Caisson as Waterproofing, Temporary Retaining Well and Concrete Form in Bridge Construction - Google Patents

Abstract

PURPOSE: Provided is a process for constructing pile base by applying caisson structure as seepage barrier or temporary construction wall body and to utilize the structure as a cast for concrete introduction in digging in ground at a position for a sub-foundation of bridge. CONSTITUTION: The process comprises steps of placing a caisson(1) on a position of a ground to install a bridge pier; mounting the caisson at desired location by excavating the ground and sinking the caisson; re-filling earth and sand into the excavated hollow and constructing the pile; and using the caisson as a cast for introducing concrete into a base plate. A shoe(2) is mounted on front end of the caisson(1) and used to easily insert the caisson into the ground. The re-filling process is for eliminating problems caused by boiling or heaving states in sand/viscous earth such as clay grounds.

Description

Piles and Footing Construction Method Using Caisson as Waterproofing, Temporary Retaining Well and Concrete Form in Bridge Construction}

The present invention relates to a foundation construction method under the bridge, specifically, by sedimenting and installing a caisson to a predetermined position in the ground where all stones and amber stones are distributed, so that it can be used as orders, temporary walls and formwork, it is difficult to intrude and It is about a new bridge underlay construction method that can be applied to underlay bridge construction in required ground.

In general, in construction work such as roads and railways, bridges are planned adjacent to rivers, particularly where existing buildings and road networks exist. Rivers use eroded protective stones on the surface to prevent soil from being eroded by the flow of river water. When the pile is used as the foundation of the lower bridge, it is difficult to excavate and install the construction without the construction of the temporary barrier due to the free flow of water, which causes problems in the construction of the temporary barrier construction.

In order to solve such a problem, the temporary coating method commonly used as a temporary coating method is a sheet pile temporary coating method by placing a sheet pile having excellent degree of ordering. Sheet pile clamper method is a method of obtaining the excellent rigidity while having wall rigidity by continuously placing U-shaped unit members with steel linkages. Or pre-boring with drilling equipment and then driven by construction. If there is a leak in the seam, it is treated by a method such as grouting to secure the degree of ordering. However, it is not possible to apply the sheet pile temporary shielding method to the ground where all the stones and amber stones are distributed deeply.

Meanwhile, a method of introducing an injection material such as liquid glass or cement milk into the ground is called a grouting method, and is a method of connecting grouting sections. This grouting method can be used to form a wall with the filler material penetrating the gap in the ground where the gap is small, such as sand, but the wall is not formed in the ground where the stone or amber is large. This is difficult.

Accordingly, the present invention is a construction method developed to overcome the limitations of the construction method of the conventional film for the foundation of the bridge lower foundation as described above, sedimentation of the caisson to a predetermined position to obtain a water repellency, deformation of the surrounding ground by excavation It is an object of the present invention to provide a new bridge lower foundation construction method that forms a rigid wall capable of suppressing the stiffness, and in particular, the caisson itself can be used as a formwork for foundation bottom plate construction.

1 is a schematic cross-sectional view of a state in which the caisson manufactured according to the present invention is installed on the ground to be mounted and the lower ground is excavated and the caisson is settled.

Figure 2 is a schematic cross-sectional view of the caisson top completely penetrated to the ground surface and backfilled to the base bottom position according to the present invention.

Figure 3 is a schematic cross-sectional view of the caisson upper part is completely penetrated in accordance with the present invention, the entire caisson back filled.

4 is a schematic cross-sectional view of a state in which piles are constructed on completely backfilled ground according to another embodiment of the present invention.

Figure 5 is a schematic cross-sectional view and detail of the pile after installing the frame on the top after being backfilled to the base plate position in accordance with the present invention.

6 is a cross-sectional view in which the bottom plate concrete is poured by using the caisson used in the present invention as a formwork.

* Explanation of Signs of Major Parts of Drawings *

1: caisson 2: shoe

3: all floors 4: earth and sand

5: pile 6: pile construction equipment

7: frame 8: H-beam

9: concrete

In order to achieve the above object, in the present invention, the caisson mounted on the top of the ground to build the bridge pier from the outside, excavating the caisson lower when the caisson upper part is intruded into the ground by the weight of the caisson Settle down to the ground, backfill it with sand and sand for pile construction, excavate the soil to the place where the foundation base is located, and construct the frame on the caisson and construct the pile directly on it, and use the caisson as the formwork. There is provided a bridge lower foundation construction method characterized in that the foundation base plate is constructed.

According to the present invention, because the caisson is excavated and sedimented the lower ground to be used in the ground where the stone or amber is distributed as a temporary barrier for the order, expensive construction cost, grouting due to difficult driving or drilling as in the prior art It can solve the problem that is not applicable.

In the present invention, in the above bridge lower foundation construction method, a construction method is provided, in which the caisson can be used as a support point of the frame for the pile construction is provided, as another embodiment, the caisson formwork during the concrete casting of the base plate Provided below the bridge construction method is characterized in that it can be used as.

According to the present invention as described above, the caisson is intruded into the ground, can support the weight of the frame and pile construction equipment for the pile construction with the frictional force of the caisson's main surface, because the caisson wall does not cause deformation, it is easy to use as a formwork It becomes possible.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the accompanying drawings, in order to explain the foundation construction method under the bridge according to the present invention, an externally manufactured caisson 1 is located on the ground 3 where the stone or amber is distributed, and the lower ground of the caisson 1 is located. A schematic cross-sectional view of a state in which the caisson is inserted into the ground by excavating is shown.

In the present invention, the caisson 1 is preferably a circular caisson structurally resistant to earth pressure. However, it is expected to use a long or square caisson that is excellent in workability of the base bottom plate and easy to arrange piles. Since the caisson is manufactured in a factory or an external workshop, it may be manufactured in a desired form of high strength concrete.

As shown in FIG. 1, a shoe 2 generally used to facilitate ground penetration of the caisson 1 is mounted at the tip of the caisson. At this time, the shoe has a sufficient strength so as not to wear or lose during penetration of the stone or amber stone layer.

In Figure 2, the upper part of the caisson penetrates into the ground, and the foundation base plate according to the method of earth-filling and driving the pile to the upper caisson as shown in Figures 4 and 5 to be described later or the method of mounting the frame on the caisson and driving the pile A schematic cross-sectional view of the state diagram (3) in which the position to be installed (Fig. 2) or the top of the caisson is backfilled with sand or the like is shown.

As such, the backfilling of the soil is expected to prevent the problems of caisson's rooting depth from being boiled in the ground where the bottoms of all stones or amber stones are sand, and heaving in the clay soil. Since it is deeper than the position, it is necessary to fill the soil to the foundation bottom plate.

On the other hand, Figure 4 and Figure 5 shows a schematic cross-sectional view of the pile driving method in the state filled with the soil back to the top of the caisson and only to the base bottom plate, as shown in the detailed view of FIG. It may be fabricated to be large enough to cover all the base plates in the field.

In this way, if the frame is sufficiently large, it is possible to work by moving the frame produced at the time of the individual base plate construction by a crane can help in reducing the construction cost and construction period.

Next, the use of caisson as formwork in the present invention will be described with reference to FIG.

The caisson (1) used in the present invention can take the role of a formwork generally used for the concrete placing of the base plate may be concrete pouring as shown in FIG.

If a piers are installed around the river, a thick layer of masonry or amber stone is installed to prevent the high water level and erosion of the river. In order to construct the foundation of the bridge under such ground, the order is possible, and the temporary facilities are needed to make the ground independent when excavating, but there are problems of intrusion of all seats and expensive construction cost.

However, as described above, in the present invention, the caissons are internally excavated and sedimented to a predetermined position to be utilized as the order and the temporary wall, so as to solve the problems caused by earth and sand secured (intrusiveness problem, cost increase, etc.) as in the prior art. Will be.

In particular, since the caisson can also be used as a formwork when laying the base plate concrete, it is possible to exclude the process of steel formwork installation, thereby significantly reducing the cost required.

In addition, in the present invention, the shape and length of the caisson can be adjusted, so that the caisson can be manufactured and used in construction according to the ground and ambient conditions.

Claims (2)

Place the caisson on the ground where you want to install the bridge piers, Excavate and settle the inside to install the caissons in a predetermined position, Backfilling with soil and constructing piles, Foundation base bridge construction method characterized in that it is used as formwork when placing concrete foundation. The method of claim 1, In order to construct the pile, the bridge base foundation construction method is to completely fill the interior of the caisson or back to the base plate position, and then frame mount the top and construct the pile.