KR20020081531A - Well form for the base operation of pier and it's operation method - Google Patents

Abstract

PURPOSE: Provided is caisson for foundation construction of pier, which is for quicker and more convenient transportation by self-buoyance and good constructability. CONSTITUTION: The caisson for foundation construction of pier is comprised of the following as: the steel caisson boat(10) which has self buoyance in an empty double-walled structure of inner and outer walls(11,12); many anchors(13) installed to lift them by tow line(15) of winch(14) in upper rim of the caisson boat.

Description

Well form for the base operation of pier and it's operation method

The present invention relates to a well bucket used for the foundation construction of bridge piers and a construction method thereof, and more particularly, to a ground condition in which super soft viscous soils are thickly distributed in a deep sea, Providing the foundation well of the piers and the construction method of the piers, which can secure the air shortage and the stability and the reliability of the construction by making it easier and faster to install the foundation wells for the piers under the required conditions. It is for.

In general, the methods used to construct the piers foundations at sea include the pile foundation method, the well foundation method and the temporary barrier method, and the super soft viscous soil layer (N value 1 or more) in deep waters (hereinafter referred to as "ultra soft layer"). Since the foundations with thick distributions require very large horizontal and vertical loads, the pile foundation method or the well foundation method cannot be applied in these conditions, so the temporary barrier method, which is an alternative method, is mainly applied. Has come. However, the temporary clogging method has a number of problems as described below, which is not efficient.

In other words, the existing pile foundation method has a large horizontal and vertical load, and if the super soft layer is thickly distributed, it is possible to secure vertical support by penetrating the super soft layer and installing a pile foundation in a good rock layer. Because it could not be directly identified, it could not be applied in the ground where the water depth was deep and the super soft layer was thickly distributed.

In addition, the construction method of the well basin foundation is to lift the wells made of concrete so that the upper portion is exposed to the water surface at the position where the foundation is to be installed as a retractor and put the concrete well in the well installation position It sinks while sinking into the water, touches the rock layer through the super soft layer and the soil layer, and then excavates the soil inside the well using excavation equipment such as cram shells, and sinks it by the well's own weight to a predetermined rock support layer depth. The method was used.

In addition, after the process of pumping out and pumping the water and the soft layer in the well and cleaning the bottom of the well, the process is completed through the process of dipping and submerged concrete in the well and underwater concrete, filling material, concrete pouring process, The conventional well-hole method has been improved only in the direction of easily sinking the well.

This well construction method is not only vertical support but also very large horizontal support, which is advantageous in terms of stability and visual confirmation of the support layer.However, the wells of concrete structures are quite heavy and are quite heavy. A fairly large crane was needed, and there was a limit to raising the height so that it could not be applied in deep waters.

In other words, if it is mounted on the super soft layer, the well of the concrete structure will sink into the super soft viscous soil layer by its own weight. Therefore, if the super soft layer is used in a thick place, the well should be made very high. It is difficult to transport and lift by the traction mechanism, so it is not applicable to the ground where the depth is deep and the super soft layer is thickly distributed.

Therefore, in the ground where the depth of water and the super soft layer are thickly distributed, the temporary barrier method is used as an alternative method due to the limitations of the above-mentioned basic method of the well tank, but the general temporary barrier method using the double assembly frame is the production of the assembly frame (SHEET PILE). Assembly) There are many limitations such as securing the route due to wide range of barriers due to transportation and mounting, and there are problems such as increase of construction cost and marine pollution due to the long air due to the large number of constructions and the complexity of construction. .

In addition, the façade construction method using wall steel pipe wells is carried out through the process of "cross-linking installation for construction → guide pile and steel pipe pile installation → excavation and cultivation of earthen ground construction → water dipping and underwater concrete placement → watering and foundation concrete casting". This is completed, too, the construction is complicated and the air takes a long time to increase the construction cost, there is a big risk of safety accidents.

The present invention was developed in view of the above-described conventional problems, and an object of the present invention is to provide a quick and simple and stable construction of a well for a piers foundation under ground conditions in which a deep depth and a super soft layer are thickly distributed. The main purpose is to provide a well for the foundation construction of the piers that can be shortened and ensure the stability and reliability of the construction and its construction method.

In order to achieve the above object, the present invention is characterized in that the well is formed by the steel material of the iron plate as a whole, but the internal construction of the well for the foundation of the piers with the interior of the outer wall is empty, Since the well of the present invention has an empty inside / outer wall and is light in weight, it is easy to carry and lift by a crane ship after manufacture, and thus the construction is good, thereby achieving the above object effectively.

Another object of the present invention is to firstly settle the fresh water in the inner / outer wall in a state in which the well is manufactured as described above by using its own buoyancy in a position to be constructed first, and then back into the inner / outer wall again. It is achieved by constructing the well construction method for the foundation construction to submerge the well to a predetermined depth by repeating the process of placing the underwater concrete in the outer wall to the secondary settlement.

As the present invention is filled with fresh water in the state of floating the well bucket in the form of the primary settlement, so that the level of the submerged while maintaining a very good horizontal, the submerged by filling the concrete concrete and then excavation work and so on rock bed It is good to confirm that it is supported on the bridge, and the scale of horizontal and vertical loads acting on the foundation is very large, so it is suitable for the construction of long bridges requiring large horizontal and vertical bearing capacity. Since the construction of the well in the well, such as quick and easy construction, the effect of shortening the air is considerable, the above object can be effectively achieved.

Figure 1a is a perspective view showing an example of the well bucket of the present invention

Figure 1b is a cross-sectional view for showing the well structure of the present invention

Figure 2a is a state carrying the well container of the present invention at sea

Figure 2b is a state diagram fixing the well bucket of the present invention with a dot

Figure 2c is a state diagram for sinking fresh water in the inside / outside wall of the well bucket of the present invention

Figure 2d is a state diagram in which the working hypothesis piles around the sink well of the present invention

Figure 2e is a state diagram for pouring underwater concrete in the wall inside / outside the well of the present invention

Figure 3 is a state in which the well bucket of the present invention is secondary settled

Figure 4 is a state of pumping water, ultra soft layer, etc. in the sink well of the present invention

Figure 5 is a state diagram for sinking the well bottom bottom rock layer of the present invention to seat the well in the rock bed

6 is a state in which the fresh water is filled in the well bucket of the present invention seated on the rock bed and poured underwater concrete

Figure 7 is a state filled with filler and reinforcement and concrete in the well of the present invention after the process of Figure 6

8 is a state diagram in which the construction of the piers foundation by the well of the present invention

Explanation of symbols for the main parts of the drawings

10: well passage 11,12: inside and outside walls

13: dot 17,70: underwater concrete

20: Hypothesis file 30: Ultra soft layer

40: soil layer 50: rock layer

71: Filler 72: reinforcement and concrete

100: foundation for piers

Hereinafter, with reference to the accompanying drawings, the method for constructing a well for a bridge construction of the bridge construction that can effectively achieve the object of the present invention will be described in detail by the process as follows.

1A and 1B, but when forming a well for the foundation construction of the piers as shown in Figure 1a and 1b is formed as a steel material of the steel plate with a buoyancy well line 10 of its own buoyancy, but the inner / outer walls (11, 12) It is a hollow double-walled structure formed at the top of the opening and the bottom is blocked, and a plurality of dots (13) on the upper edge of the well line 10 to the lifting line 15 of the winch (14) It is characterized in that the installation so that.

Hereinafter will be described in detail for each process the construction process to the well body of the present invention described above.

1st process (Well line production and transportation process)

1A and 1B in the workshop to produce the well line 10 from the steel material of the steel plate, but the inner and outer walls (11) (12) to make a double-wall structure of the hollow hollow to have its own buoyancy but the top The opening and the lower end is manufactured in a closed state, and is installed on the upper edge surface of the well line 10 so that a plurality of dots 13 can be elevated by the tow line 15 of the winch 14.

Then, the manufactured well line 10 is transported to the construction position in the state floating on the sea by its own buoyancy as shown in Figure 2a and then a dot 13 hanging on the upper edge of the well line 10 as shown in Figure 2b Lower the well to fix the position of the well line (10).

2nd process (the 1st settlement of well route)

After completion of the first step, the fresh water is filled by pumping the fresh water through the upper openings of the inner and outer walls 11 and 12 of the well passage line 10. Then the well passage 10 sinks slowly by the weight of the freshwater being filled, and the freshwater filled is spread evenly inside the wall to balance itself by itself, so only the self-weight and buoyancy of the well passage 10 need to be reviewed horizontally. Workability is good as there is no need to fit.

3rd process (work construction temporary file construction)

When the first settlement of the well passage line 10 becomes a predetermined interval along the boundary of the well passage line 10, the temporary construction pile 20 for work is passed through the super soft layer 30 and the soil layer 40 as shown in FIG. 2D, and the rock layer 50. Drive until it is plugged into the construction. Then the well line 10 is blocked by the hypothesis pile 20, the position is maintained as it is.

4th process (second subsidence by underwater concrete filling)

As shown in FIG. 2E, the inner concrete 17 is poured into the inner and outer walls 11 and 12 of the well passage line 10. Then, the well passage line 10 sinks further by the weight of the underwater concrete 17 filled in the wall and is submerged. At this time, by examining the self-weight and buoyancy of the well passage line 10 increased by the underwater concrete 17, the well passage line 10 is preferably placed under water concrete in a balanced manner so that one side is not inclined, and the bottom of the well passage line 10 At this time, most pass through the super soft layer 30 to stay in the soil layer 40 or to reach the rock layer 50.

5th process (water, weak layer pumping and excavation process inside the well passage)

After the fourth step, as shown in FIG. 4, the water filled in the well passage 10 and the ultra soft layer 30 are pumped out. When the rock layer 50 appears on the bottom of the well passage line 10 after the operation of discharging the water and the ultra soft layer 30 inside the well passage line 10 is completed, the rock bed is excavated using cram shells or the like as shown in FIG. 5. Excavating and performing the process of artificially sinking the well passage line 10 and the process of cleanly cleaning the bottom of the well passage line 10 until the well passage line 10 is submerged and supported to a predetermined rock layer 50 depth. .

6th process (underwater concrete, filling material, concrete pouring process)

When it is stably seated on the rock layer 50 by the fifth process, the water is contained in the well passage 10 up to a predetermined height, and then the water concrete 70 is poured to the buoyancy resistance position as shown in FIG. 6 and the well passage ( 10) After the process of completely discharging the water inside the curing material 71 and the reinforcement work and concrete 72 pouring process in turn to perform the curing process and then the final clean up when the upper surface as shown in Figure 8 Construction of the piers foundation 100 exposed to the top is completed.

As described above, the present invention is to make the well-container for the foundation construction of the piers in the well line with its own buoyancy, and then to float it on the sea with its own buoyancy, so that the transport process is quick and simple, deep water depth and ultra soft layer thick It is easy to confirm that it is supported by the rock layer while settling the well line for 2 times in the sea of the distributed ground conditions, and it has an effect with favorable constructability.

In addition, the large horizontal and vertical load acting on the foundation has the effect of being suitable for the construction of long bridges that require large horizontal and vertical bearing capacity. It is a very innovative invention because it has high saving effect and can secure construction stability and reliability.

Claims (2)

In constructing the wells for the foundation construction of the piers, The inner and outer walls 11 and 12 are made of steel and are formed in a hollow wall structure having a hollow inside, and are formed as well wells 10 having their own buoyancy, and a plurality of dots are formed on the upper edge surface of the wells 10. A well for construction of a piers, characterized in that (13) is installed so that the winch 14 can be elevated by the traction line (15). In constructing the wells for the foundation construction of the piers, The inner and outer walls (11) and (12) are hollowed out so that they have their own buoyancy and a plurality of dots (13) installed on the upper edge surface are lifted and lifted to the construction site by floating on the sea with their own buoyancy. A first step of fixing the well communication line 10 by lowering the dot 13; A second step of first submerging the well passage line 10 by filling fresh water into the inner / outer walls 11 and 12 of the well passage line 10 after the first step; A third step of embedding the working temporary file 20 at a predetermined interval along the edge of the well passage line 10; A fourth step of placing the underwater concrete 17 inside the inner / outer walls 11 and 12 of the well passage 10 to secondly sink the well passage 10; A fifth step of discharging the water filled in the second submerged well passage 10 and the super soft layer 30 and the soil layer 40 and then excavating the rock layer 50 to support the well passage line 10 to the rock layer 50. and; Water is contained in the well passage 10 supported by the rock bed 50, and the underwater concrete 70 is poured to the buoyancy resistance position, and then the water inside the well passage 10 is completely drained and the filling material 71 and the reinforcement work and A sixth step of sequentially placing the concrete 72; Well construction method for the foundation construction of piers, characterized in that consisting of.