KR20020068118A - Protecting Structure of Concrete Caisson - Google Patents

Abstract

PURPOSE: The protective structure for a concrete open caisson structure is provided to prevent an impact added to a concrete structure when blasting and to prevent the damage of a concrete structure and the corrosion of a reinforcing bar. CONSTITUTION: As for anchoring a concrete open caisson(10) on a bedrock, the protective structure for a concrete open caisson structure comprises the steps of: installing PE blocks(20) manufactured in thermoplastic resins continuously around a lower inside of the open caisson(10); installing at least one or more wale(30) on the inside of a cylinder formed by connecting the PE blocks(20); and installing horizontal bearers(40) located on the wale(30) and passed through the center of the open caisson(10) radially.

Description

Protecting Structure of Concrete Caisson

The present invention relates to a protection structure of a concrete well bucket structure used as a foundation of a bridge, in particular, when a well is settled in a rock layer, a crack is generated in the well structure by installing a shock absorber inside the well. It relates to a concrete well structure protection structure to prevent the

In general, the caisson foundation is a method of sinking dried on land or in water to a predetermined depth by caisson weight or loading load, and when there are amber stones on the surface or intermediate layer, and the type of pile is difficult, or as a foundation for bridges across rivers. Deep water, pile foundations, etc., are employed when aerodynamics are higher than caisson foundations or when rigidity of superstructures and substructures is required.

Types of the caisson foundation method as described above are classified into air caissons (Pneumatic Caisson), box caissons (Box Caisson) and wells Caisson (Open Caisson), etc. The present invention relates to the well caisson among them.

Referring to Figure 1 of the well caisson foundation method, it is composed of a cylindrical concrete structure 11, the front end portion 12 has a cover shoe (12a) made of steel to protect the front end portion Make sinking easier. At this time, the angle of the tip part 12 is selectively employ | adopted about 30 degrees, 45 degrees, and 60 degrees according to the state of the ground.

In the construction method of the well caisson foundation configured as described above, the well bucket 10 is first placed in a predetermined position, and then the sewage structure is gradually connected by stepping by the self weight and the reloading while digging out the soil inside.

As described above, when the concrete well bucket 10 that has been settled down reaches the soft rock layer and is difficult to settle only by its own weight and re-loading, the soft rock layer inside the well 10 is drilled by blasting by mounting explosives. The excavation of more than about 1m after the well will be settled on a solid rock 10.

As described above, when the well 10 reaches the ground of a solid rock, etc., the concrete is hit by the inside of the well, and then filled with concrete, sand, gravel, etc., to build the foundation of the well.

The conventional wells constructed and constructed as described above have cracks on the inner circumferential surface of the lowermost well by the impact of blasting inside the wells made of the concrete structure when the blasting, causing breakage of the concrete structure and the corrosion of the steel. By lowering the strength and durability, the stability of the structure is impaired, causing problems such as shortening the life of the bridge foundation.

Accordingly, the present invention was devised to solve the problems caused by the impact on the concrete structure of the lowermost well at the time of blasting, which is a construction problem according to the foundation method of the well caisson, and made of thermoplastic resin along the inner circumferential surface of the lowermost well. The PE blocks are installed in a row to prevent the impact on the concrete structure during blasting, thus providing a structure protection structure when fixing a well bucket that can maintain the strength and durability of the structure by preventing damage and reinforcement of the concrete structure. It is.

The present invention for achieving the above object in the fixing of the well bucket used as the foundation of the bridge to the foundation rock, the PE block is made of a thermoplastic resin around the lower inner circumference of the bottom of the continuous round It is installed, and while supporting the at least one strip on the inner circumferential surface formed by the PE block is connected to the cylindrical body, provides a concrete well structure protection structure for radially installing a horizontal support passing through the center of the well.

1 is a cross-sectional view of a conventional well caisson foundation method applied state

Figure 2 is a cross-sectional view of the well structure structure protection structure applied according to the present invention

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a perspective view of a PE block according to the present invention;

Figure 5 is a plan view showing the support means for supporting the PE block of the present invention

FIG. 6 is a detailed view of portion 'A' shown in FIG.

FIG. 7 is a detailed view of portion 'B' shown in FIG. 5

<Description of the symbols for the main parts of the drawings>

10: well 11: the concrete structure 12: tip

12a: cover 20: PE block 21: protrusion

22: home 30: strip 31: long

32: Bolt 33: Nut 40: Horizontal support

41: expansion and contraction means

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

Figure 2 is a cross-sectional view of the concrete well structure protection structure applied state according to the present invention, Figure 3 is a cross-sectional view taken along line AA of Figure 2, Figure 4 is a perspective view showing a PE block according to the present invention, Figure 5 is a view of the present invention A plan view showing the support means for supporting the PE block, Figure 6 is a detailed view of the 'A' portion shown in Figure 5, Figure 7 is a detailed view of the 'B' portion shown in FIG.

In these figures, reference numeral 10 denotes a well. The well 10 is formed of a concrete structure 11, a tip portion 12 having a predetermined angle is formed at the bottom thereof, the cover shoe 12a is provided to protect the tip portion 12 and to settle down easily. It is provided.

Reference numeral 20 is a PE block. The PE block 20 is made of a thermoplastic resin, it is formed to have a constant height. At this time, the projections 21 and the grooves 22 are respectively formed in the vertical direction of both ends of the PE block 20, when installed along the inner circumferential surface of the well, having a slight elasticity to bend the shape It is made possible.

When the PE block 20 is manufactured to be repeatedly used several times, the height is generally 3m, the width is 1.5m and 0.5m to be applied according to the size of the well 10 It is preferable to be produced in the form of.

Reference numeral 30 is a band length. The strip 30 is formed of steel and formed in the hole 31 at both ends thereof so as to be usable according to the size of the inside of the well 10, so that both ends thereof are fastened by using the bolt 32 and the nut 33. It is configured to be.

The strip 30 is formed to have a long hole 31 on each end thereof is elastically adjusted to support the PE block 20.

Reference numeral 40 is a horizontal support. The horizontal support 40 is located at both ends at the position of the strip 30, it is installed radially past the center of the well (10).

In addition, the horizontal support 40 is provided with elastic adjustment means 41 is adjustable in length, the elastic adjustment means 41 is used a turnbuckle device.

Referring to the installation method of the present invention configured as described above are as follows.

First, the bottom of the well 10 is settled step by step when the bottom reaches the soft rock and it is difficult to sink only by its own weight and reloading, water is pumped so as to be able to work therein.

Then, PE blocks 20 are installed along the inner circumferential surface of the bottom concrete well 10. At this time, the protrusions 21 and the grooves 22 of the PE blocks 20 are installed to be matched with each other, and according to the size of the well 10, the PE blocks 20 composed of 1.5 m and 0.5 m in width are appropriately selected. Install by mixing.

In addition, it is revealed that the PE block 20 can be properly installed along the inner circumferential surface of the well by using two types of mixtures when installing the PE blocks 20.

The PE blocks 20 are connected to the upper and lower sides of at least one belt 30, respectively, in order to prevent the flow of the PE blocks 20 for the impact of the blasting on the inner circumferential surface of the cylindrical body. Then, the bolt 32 and the nut 33 provided in the strip 30 are fastened to match the width of the inside of the PE block 20 to fix the strip.

In addition, after one side end of the horizontal support 40 is positioned at the position of the belt length, the other end using the expansion and contraction means 41 to be in contact with the position of the belt length 30. At this time, the horizontal support 40 is preferably installed to pass through the center of the well (10).

After installing the strip 30 and the horizontal support 40 as described above to prevent the PE block 20 to flow along the inner circumferential surface of the well, and then drilled a hole in the bottom rock of the well with an excavator in this hole The explosives are loaded and blasted to excavate the rock in the soft rock layer.

After being excavated to a predetermined depth, the horizontal support 40, the belt 30 and the PE block 20 are dismantled in order, and reused when the next well 10 is blasted. Fill the sand, gravel, etc. to complete the basic structure of the bridge.

The concrete well structure protection structure of the present invention constructed and installed as described above, PE blocks made of thermoplastic resin around the lower inner circumference of the well is installed in a continuous round, thereby being applied to the concrete structure at the time of blasting By preventing the impact, it is possible to prolong the life of the bridge foundation for a long time by preventing damage to the concrete structure and corrosion of the reinforcement.

As described above, the present invention is a very useful invention having various effects such as to maintain the strength and durability of the concrete structure to ensure structural stability.

Claims (3)

In fixing the concrete well (10) built on the foundation of the bridge to the rock, It is made of thermoplastic resin around the lower inner circumference of the well (10) and installed continuously round the PE block 20 having a certain height, The PE block 20 is connected to the inner circumferential surface formed of a cylindrical body surrounding at least one or more strips 30, Both ends are positioned at the position of the strip 30, the concrete well structure protection structure, characterized in that made by radially installing a horizontal support (40) passing through the center of the well (10). The method of claim 1, wherein the PE block 20 is a concrete well structure protection structure, characterized in that the projections (21) and the grooves (22) are formed in the vertical direction at both ends, respectively. According to claim 1, wherein the belt 30 is a long hole 31 is formed on each end thereof is elastically adjusted to support the PE block 20, the horizontal support 40, the elastic adjustment using a turnbuckle device Concrete structure structure for the structure of the well structure, characterized in that the means (41) is provided so that the length can be adjusted.