KR101703441B1 - Cassion manufacturing method of bottom-up, pre-cast and a base plate type using floating dock, system, floating dock and cassion using thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing a bottom-up precast bottom-plate type caisson using a floating dock, a system therefor, the floating dock, and the caisson using the same. To this end, the method for manufacturing the bottom-up precast bottom-plate type caisson including the floating dock includes: a bottom plate manufacturing step of manufacturing a modular bottom plate in a manufacturing field on the land; a bottom plate transferring step of transferring the bottom plate manufactured in the manufacturing field to the floating dock; a floating dock transferring step of transferring the floating dock where the bottom plate is seated to the top of a seating unit which is a sea-bed at a specific location of a coast; a floating dock seating step of seating the floating dock on the seating unit; and a caisson manufacturing step of manufacturing a caisson on the bottom plate in the floating dock by using a bottom-up method. Therefore, the present invention can greatly reduce expenses for securing land, expenses for preparing a manufacturing field such as pile construction, and expenses for restoring the manufacturing field such as removal of piles after completion of manufacturing the caisson. The expenses are problems of an existing multi-step caisson manufacturing method.

Description

Technical Field [0001] The present invention relates to a method of manufacturing a bottom-type pre-cast low-plate caisson using a floating dock, a system thereof, a floating dock and a caisson using the same using them}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bottom-up precast low plate type caisson using a floating dock, a system thereof, a floating dock thereof and a caisson using the same, and more particularly, A method for manufacturing a bottom-up precast low-plate-type caisson using a floating dock for forming a caisson in a floating dock by forming a bottom portion and transferring the bottom plate to a floating dock in a modular form on the ground, It is about the used caisson.

A caisson is a foundation which is made up of a hollow concrete or a steel structure preliminarily manufactured in water or ground by submerging it to a supporting layer by applying a weight or a loading load, then blocking the floor with concrete and filling it with sand, gravel or concrete . These caissons are used in the case where the foundation is installed in water below 25m depth, the gravel layer is present in the middle layer, the pile is difficult to construct, the structure in which a large horizontal load acts and the superstructure is rigid due to a long bridge, It is suitable when stability is required.

Caissons can be largely classified as open casings, pneumatic casings and box casings. An open caisson is a concrete pail with open top and bottom during construction. It is also called a well foundation and has various shapes such as round, rectangle and ellipse. A pneumatic caisson is a caisson with a work area at the bottom and a caisson with an open bottom, which is used in places where it is difficult to excavate because there are more dirt coming in from the excavated soil. The box caisson is a caisson of the construction method in which a caisson, which is a bottom surface produced by the ground, is towed in the sea, picked up in a horizontally stopped support layer, and the inside of the box is filled with sand, gravel, concrete or water.

Conventional caisson making and launching methods include dry dock, floating dock, or multi-stage caisson making using crane wire. 1 is a flow chart of a conventional multi-stage caisson manufacturing method. As shown in FIG. 1, the multi-stage caisson manufacturing method has a total of four steps. In the first step S1, a worksite on the land is selected, a pile 11 is installed on a selected worksite, . In the second step S2, the caisson 1 is manufactured using the slip foam in the gantry tower 12. In the third step S3, the completed caisson 1 is cured, The caisson 1 is transported to the barge line 13 in the fourth step S4 and then is launched into the coast. However, such a multi-stage caisson manufacturing method has a problem in that it takes a lot of site acquisition cost and construction cost, requires a demolishing process after completion of fabrication, and requires reinstallation at other sites.

In order to solve the problems of the conventional multi-stage caisson manufacturing method, a method of manufacturing a top-down caisson using a floating dock has been proposed. 2 is a flowchart of a method of manufacturing a top-down caisson using a floating dock according to the prior art. As shown in FIG. 2, the method of manufacturing a top-down caisson using such a floating dock uses the floating dock 14, which has been conventionally used only for transportation and launching, in manufacturing the caisson 1 as well. The method of manufacturing a top-down caisson using a floating dock includes a first step (S10) of moving a floating dock including a gantry tower 12, a water wall 16 and a barge line 14 to an engine 15 having a seam, A second step S11 of fabricating a caisson while sinking the floating dock below the water surface 17, a third step S12 of completing the manufacture of the caisson, and a third step S12 of fabricating the caisson 1, (Step S13). The method of manufacturing a top-down caisson using a floating dock according to the prior art has a disadvantage in that the time and the running time for manufacturing the caisson 1 are increased, but it has been recognized as a very efficient method for manufacturing a small scale caisson in a place where it is difficult to secure a site for production.

Korean Patent No. 10-0722495, Caisson making and launching method using floating dock, Woongjin Development Co., Ltd. Korean Patent Laid-Open No. 10-2013-000100, Floating dock and method for manufacturing caisson using the same, Gold Marine Co., Ltd. International Patent Publication WO 2014/107039, Floating dock, and method for manufacturing caisson using same, Gold marine commerce Co., LTD

However, the conventional method of manufacturing a caisson using a floating dock uses a top-down manufacturing method in which a slip foam is fixed on the upper side of a floating dock and a floating dock is calibrated in accordance with the caisson wall, There is a problem that a place that can be secured is required. Therefore, it is necessary to install a wall having a depth of about 20 m or more, or to move away from the coast when there is no such wall, so there is another problem that the cost of conveying the remicon is further increased. In addition, there is a disadvantage in workability such as horizontal maintenance and vertical wall maintenance when a caisson is manufactured by floating work.

Accordingly, the present invention has been made to solve the above-described problems.

It is an object of the present invention to provide a method and apparatus for making a caisson downward from a floating dock by forming a lightweight caisson bottom plate in a modular form on the ground instead of using a conventional floating dock using a floating dock requiring securement of depth, A method of manufacturing a caisson using the floating dock, a floating dock thereof, and a caisson using the same.

Hereinafter, specific means for achieving the object of the present invention will be described.

An object of the present invention is to provide a method of manufacturing a bottom plate, A bottom plate transferring step of transferring the bottom plate completed in the manufacturing site to the floating dock; And a floating dock transporting step of transporting the floating dock on which the bottom plate is placed, above the bottom of the container, which is a specific position of the bottom of the water; A floating dock mounting step of placing the floating dock on the fixed bottom; And a caisson fabricating step of fabricating a caisson in a bottom dock on the basis of the bottom plate. In the bottom plate manufacturing step, the bottom plate is fabricated from a plurality of modules, and in the bottom plate transferring step, Wherein the plurality of modules are independently connected to the floating dock and coupled at the floating dock, wherein the plurality of modules are connected by a fixed line passing through each of the plurality of modules. Can be achieved by providing a manufacturing method.

The floating dock includes a mounting portion on one side of which is fixedly mounted on a sidewall, the sidewall of which is formed of a bracing block type, the mounting portion on which the one side of the floating dock is mounted, Shape.

The floating dock may include a jack-up leg provided below the floating dock and supporting a lower portion of the floating dock; And a footing foundation formed at the lower end of the jack-up leg and in contact with the sea floor.

Another object of the present invention is to provide a low plate manufacturing facility, A bottom plate transferring unit for transferring the bottom plate completed in the bottom plate manufacturing site to a specific position in the bottom plate manufacturing site; A floating dock configured to be able to float in the water while the finished bottom plate is transported and placed by the bottom plate transfer unit and having a slip foam movable up and down; And a lowering unit configured to allow the floating dock to be seated at a specific position of the bottom of the water, wherein the floating dock on which the bottom plate is seated is supported by the slip foam in a bottom- Wherein the bottom plate is comprised of a plurality of modules, each of the plurality of modules is fabricated in the bottom plate manufacturing site, the plurality of modules are independently transported to the floating dock, The present invention provides a bottom-up precast low plate caisson production system using a floating dock, wherein the plurality of modules are connected by a fixed line passing through each of the plurality of modules.

Another object of the present invention is to provide a gantry tower in which an inner space is formed by a loop and a column, and a slip foam capable of being moved up and down for making a caisson; A water inlet wall configured to surround the gantry tower and to block inflow water flowing from the side of the gantry tower when the caisson is manufactured; And a plurality of modules each of which is made onshore and constitutes a bottom plate of the caisson, are sequentially transferred to the inner space of the gantry tower, Wherein the plurality of modules are connected by a fixed line passing through each of the plurality of modules and are coupled to each other in the inner space of the gantry tower, Characterized in that the caisson is produced in a bottom-up manner by means of a foam.

Further comprising a main water pump provided in the gantry tower and configured to perform ballast water supply to the ballast tank of the barge, wherein when the caisson is launched, the main water pump pumps the ballast tank And the ballast water is injected.

It is a further object of the present invention to provide a method and a system for mounting a plurality of modules in a floating dock, comprising a plurality of modules manufactured onshore, the plurality of modules being sequentially transferred to a floating dock capable of floating in water, A bottom plate constituted by; And a wall made on the bottom plate in the floating dock, wherein the wall is manufactured in a state in which the floating dock is seated in a fixed bottom portion at a specific position of the underwater floor, Wherein the plurality of modules are connected by a fixed line passing through the plurality of modules.

As described above, the present invention has the following effects.

First, according to one embodiment of the present invention, it is possible to greatly reduce the cost of securing a site, which is a problem of a conventional multi-stage caisson manufacturing method, a cost of recovering a site after a caisson production completion, There is an effect that can be done.

Second, according to one embodiment of the present invention, there is an advantage that a wall having a required water depth is not necessary for a top-down method using a conventional floating dock.

Third, according to an embodiment of the present invention, the bottom plate is pre-casted in the form of a pre-cast module and transported, thereby shortening the production period by 3 to 4 days.

Fourthly, according to the embodiment of the present invention, the effect of reducing the ground reinforcement cost such as pile construction on the fixed bottom can be obtained by the load distribution effect of the floating dock.

Fifth, according to the embodiment of the present invention, the cost of ground reinforcement can be reduced compared with the conventional multi-stage land manufacturing method because the cost of land production is reduced and the processes requiring ground reinforcement are reduced or unnecessary.

Sixth, according to an embodiment of the present invention, the conveying step is shortened to two stages, and the caisson is not required to be conveyed in the completion stage, so that the conveying system can be made small in size as compared with the existing multi-stage land manufacturing method.

Seventh, according to one embodiment of the present invention, there is an effect of being advantageous in improving the workability such as the bottom plate horizontal maintenance and the wall verticality management as compared with the floating floating dock work.

Eighth, according to one embodiment of the present invention, a favorable effect is obtained when it is difficult to secure the site of the manufacturing site, when the wall is difficult to secure the water depth, and when a small scale caisson is manufactured.

Ninth, according to one embodiment of the present invention, an effect is produced that the caisson can be manufactured by moving every site.

In the tenth aspect of the present invention, when the main pump is installed in the gantry tower itself, it is easy to manage the amount of ballast water to be supplied to the ballast tank of the floating dock when the caisson is launched, It is possible to solve the problem. Conventionally, a ballast water was injected into each compartment of the floating dock in-line ballast tanks by installing a separate pump in the floating dock in the stage of the caisson launch. However, the process was complicated and the caisson stability problem was caused by the error of the injection amount.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a conventional multi-
2 is a flow chart of a method of manufacturing a top-down caisson using a floating dock according to the prior art,
FIG. 3 is a flowchart illustrating a method of manufacturing a bottom-up precast low-plate-type caisson using a floating dock according to an embodiment of the present invention.
FIG. 4 is a schematic view showing a method of manufacturing a bottom-up precast low-plate-type caisson using a floating dock according to an embodiment of the present invention.
5 is an exploded perspective view showing a modular bottom plate according to a first modified example of the present invention,
6 is a perspective view showing a modular bottom plate according to a first modification of the present invention,
FIG. 7 is a schematic view showing a method of manufacturing a bottom-up precast low-plate-type caisson using a floating dock according to a third modification of the present invention.
8 is a schematic view showing a method of manufacturing a bottom-up precast low plate type caisson using a floating dock according to a fourth modification of the present invention,
9 is a schematic diagram showing a basic structure of a gantry tower according to an embodiment of the present invention,
10 is a schematic diagram showing a basic structure of a slip foam apparatus according to an embodiment of the present invention,
11 is an explanatory view showing load analysis results obtained by comparing the floor surface reaction force of an embodiment of the present invention with the conventional art,
12 is a view showing a change of a ground improvement area generated according to an embodiment of the present invention;
FIG. 13 is a diagram illustrating a predetermined process table for each process according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description of the operation principle of the preferred embodiment of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Bottom-up precast low-plate caisson manufacturing method using floating dock

FIG. 3 is a flowchart illustrating a method of manufacturing a bottom-up precast low-plate-type caisson using a floating dock according to an embodiment of the present invention, FIG. 4 is a cross- 1 is a schematic view showing a method of manufacturing a bottom-up precast low-plate-type caisson using a floating dock according to an embodiment. As shown in FIGS. 3 and 4, the method of manufacturing a bottom-up precast low plate type caisson using a floating dock according to an embodiment of the present invention may include a bottom plate producing and conveying step S10 and a caisson making step S20 have.

The bottom plate manufacturing and transferring step S10 is a step of manufacturing a bottom plate on the ground and transferring the prepared bottom plate into the floating dock. According to the prior art, a caisson was manufactured by making a caisson manufacturing site on land, making a caisson in a multi-stage, moving it to a floating dock, and then launching the caisson. However, the conventional technology has a disadvantage in that it requires a huge site acquisition cost and a manufacturing facility cost. According to the embodiment of the present invention, since only the bottom plate is manufactured on the land and is transported into the floating dock, it is not necessary to secure a huge site, and the manufacturing cost of the production hall is reduced considerably.

Particularly, according to the first modification of the present invention, a modular bottom plate can be manufactured, and the effect of shortening the curing period and reducing the length of the bottom plate can be generated. 5 and 6 are schematic views showing a modular bottom plate according to a first modification of the present invention. Conventionally, there has been a problem that when the bottom plate of caisson is manufactured, it takes about one week to place reinforcement, concrete pouring, and curing, and cracks occur during temperature cracking and movement due to exposure at room temperature during that period. Therefore, as shown in FIGS. 5 and 6, the first modification of the present invention may further include a step of dividing the bottom plate into the vapor cures on the land, and then transferring the bottom plate into the floating dock, respectively, to assemble them in the floating dock. According to the first modification of the present invention, the bottom plate is formed in a modular shape, so that the modular bottom plate is transferred in the vertical or horizontal direction of the floating dock according to the situation in the field, so that the working load can be controlled. In addition, the first modification of the present invention has an advantage that stability can be secured as compared with an existing method in which an entire caisson is manufactured on land and then transported. Furthermore, according to the first modification of the present invention, when the steam curing method is used, not only the strength of the bottom plate is increased, but also the effect of temperature cracking and prevention of cracking during movement is generated. As compared with the conventional curing at room temperature, %. ≪ / RTI >

In the modular bottom plate 100 according to the first modification of the present invention, a plurality of modules 101 may be coupled through a fixing line 102 made of a steel wire such as a PC steel wire or a synthetic resin. This fixed line 102 has an effect of precise conveyance of each module 101, and an effect that the modules are not separated at the time of coupling occurs. According to this, there is no separation and precise connection is possible, which also helps to secure watertightness. At least one through hole 103 may be formed in the module so that it can be penetrated by a fixing wire. As a combining method of each module, for example, after three modules are arranged, a fixed line 102 is passed through a through hole 103 of each module 101, and both ends of the fixed line 102 are connected to a tension There is a first method in which it is secured by a fixture in a state of being pulled by a jack.

In addition, the modular bottom plate according to the first modification of the present invention may be configured such that at least one coupling groove 104 and the projection 105 are engaged with each other between the module and the module. The coupling groove 104 and the protrusion 105 serve to guide the module and the module to be matched with each other. If the bottom plate is produced modularly, the size may not be accurate. As a result, there is a problem that a height difference between several modules occurs when the modular bottom plate is transferred. This problem is the cause of inaccurate caisson manufacturing. Therefore, the male and female defects of the horizontally-shaped coupling groove 104 and the protrusion 105 between the module and the module serve to prevent such a height deviation.

In addition, the module type bottom plate according to the first modification of the present invention may have a grout portion 106 configured to expose a fixing line 102 passing through one side of the module. As a method of joining the modules, the reinforcing bars exposed in the coupling grooves 104 are connected to each other by a reinforcing coupler to assemble the module, and then the grout portion 106 or the coupling groove 104 itself is filled with a non- There is a second way to fill in.

Each module can be moved vertically or horizontally in the floating dock depending on the situation of the site, and can be transported by using the hydraulic jack for load-out. When the modular bottom plate is manufactured, it is possible to easily integrate the bottom plate and the wall by exposing the reinforcing bars in advance for the continuity of construction of the wall.

The caisson making step S20 is a step of mounting a floating dock on the bottom of the recess formed on the coast and making a caisson upwards by using a slip foam in the floating dock. According to the prior art, a slip foam is fixed at the top in a floating dock, and a method of manufacturing a top-down caisson in which a floating dock is calibrated in conformity with the construction of a caisson wall has been used. However, according to the prior art, there is a restriction that a quay wall structure having sufficient water depth is required due to a top-down production, and when there is no quay wall, it is required to work out to the sea. There was a problem. In addition, since caissons are manufactured in a floating manner, it is more difficult to keep horizontal or vertical wall. According to the embodiment of the present invention, since the floating dock is mounted on the bottom of the coast, the problem of the conventional art is solved.

Generally, when the caisson is manufactured in the floating dock, when the caisson is manufactured in a top-down manner, there is a problem that the caisson is not exposed to the seawater in a state in which the curing period is not sufficiently secured. However, The caisson is not exposed to seawater, so that the problem of securing the caisson quality is solved.

According to the second modification of the present invention, a water level plate can be installed on the floating dock to block the inflow of seawater which may occur when a caisson is manufactured in the floating dock. Alternatively, a separate fabrication area surrounding the floating dock can be made to reduce the influence of the wave.

The embodiment and the first and second modifications of the present invention can be used both in the case where the side walls are adjacent to the floating dock and in the case where the side walls are not present. However, in the case where a quay wall exists in particular, the following third and fourth modifications may be additionally proposed.

7 is a schematic diagram showing a third modification of the present invention. As shown in Fig. 7, according to the third modification of the present invention, the shape of the transverse piercing recess 21 and the collapsible block wall 20 can be proposed. In the case of a quay wall, according to a third modified example of the present invention, the quay wall 20 can be manufactured. In the case of manufacturing a quay wall as a brittle block type, there is an advantage that the process is simple and the workability is good. At this time, unlike the existing breech block type wall, it is possible to provide a space for mounting the floating dock 2 in the form of "b" According to the third modified example of the present invention, in the case of the transversely piercing type fastening portion 21, the bottom of the floating dock can be formed from the inner wall by using the lateral piercing method. The use of the lateral piercing method with the closure part is advantageous in that there is no fear of differential settlement, and sufficient stability is secured in the production of caissons compared to stones.

8 is a schematic diagram showing a fourth modification of the present invention. 8, according to a fourth modification of the present invention, a form using a floating dock 2 with a jacking system including a footing foundation 30 and a jack-up leg 31 may be proposed. According to the fourth modification of the present invention, a bottom-up precast low-plate-type caisson manufacturing method according to an embodiment of the present invention can be performed without a composition of a clay bottom portion. In the case of conventional jack-up pants, there is a problem in that the load to be supported by the jack-up leg is considerably large as the pants must be lifted completely over the surface of the water. However, the jacking system according to the fourth modification of the present invention is required to stably support the floating dock without lifting the floating dock completely, and the buoyancy of the floating dock as well as the supporting force of the footing foundation 30 and the jack- So that the effect of the load acting on the lower part of the jacking system is significantly reduced as compared with the conventional jack-up pants. In addition, according to the fourth modification of the present invention, when the jacking system is constructed in the flocking dock 2, it is not necessary to construct a sandstone bottom, a file or the like for each production site, thereby minimizing marine environmental destruction and minimizing marine construction Air can be shortened. In addition, since it can be continuously used, it has an economical advantage as compared with the case where a clay is formed for each production site when used for a long period of time. In addition, since the jacking system is disposed at the lower portion of the floating dock 2, the height of the floating dock 2 can be adjusted so that the height of the floating dock can be easily adjusted according to the length of the manufacturing dock, Is generated.

After completion of the caisson fabrication, in connection with the launch phase, one embodiment of the present invention may utilize the additional buoyancy of seawater incoming during high tide. More specifically, in the case where a caisson is manufactured in a region where the difference between the tide lengths is significant, an additional buoyancy is generated by the seawater flowing during high tide in the floating dock, and an additional buoyancy generated during high- , So that the floating dock can be detached from the recess. As described above, the embodiment of the present invention in which the difference between the tide gauge is used allows the de-ballasting cost reduction and the air shortening effect to be obtained as compared with the general launch method. Moreover, the high-temperature period is present every day, and the start time of the high tide can be checked clearly, so that it is possible to design the process unit in an accurate time unit.

Bottom-up precast low-plate caisson manufacturing system using floating dock

With respect to a bottom-up precast low-plate caisson production system using a floating dock, a bottom-up precast low plate caisson production system using a floating dock according to an embodiment of the present invention includes a bottom plate production stage, a bottom plate conveying means, and a floating dock .

The bottom plate can be installed on the land, and the bottom plate is completed by installing the stone for the bottom plate, chopping it, assembling the foundation steel, installing the formwork, and pouring and curing the concrete.

The bottom plate conveying means uses a hydraulic jack, a jack rod, a jack track or a lifting line. The finished bottom plate is transported to the floating dock at the bottom plate manufacturing site. Unlike the prior art, only the bottom plate is transported, so that it is possible to transport the bottom plate quickly without a large workload.

The floating dock is mounted on a seabed at the coast, and a floating gantry tower and a vertically movable slip foaming apparatus configured to be capable of bottom-up construction are constructed in the floating dock. The finished bottom plate is transported to such a floating dock, and the wall of the caisson is produced on the transported bottom plate. In the slipforming system, when the lower concrete reaches the strength to be able to stand on its own as an initial structure, the slipform apparatus continuously moves vertically through the vertical movement of the slipform apparatus, and the concrete is placed in the vertically moved form It is a device for constructing any concrete structure without repeated construction. After the bottom plate is transferred to the floating dock, the foundation steel is connected to the formwork on the bottom plate, and concrete is put on (15-20 cm / hr according to one embodiment of the present invention) to make the caisson.

When the caisson is completed, the caisson is launched to the sea. In an embodiment of the present invention, additional buoyancy of seawater introduced during high tide can be utilized. More specifically, in the case where a caisson is manufactured in a region where the difference between the tide lengths is significant, an additional buoyancy is generated by the seawater flowing during high tide in the floating dock, and an additional buoyancy generated during high- , So that the floating dock can be detached from the recess. As described above, the embodiment of the present invention in which the difference between the tide gauge is used allows the de-ballasting cost reduction and the air shortening effect to be obtained as compared with the general launch method. Moreover, the high-temperature period is present every day, and the start time of the high tide can be checked clearly, so that it is possible to design the process unit in an accurate time unit.

With respect to the gantry tower, Fig. 9 is a schematic diagram showing the basic structure of a gantry tower according to an embodiment of the present invention. The gantry towers can be divided into a transfer lane, a hanging scaffold, a slipform deck, a slipform upper deck, a roof winch, , A gantry tower frame, a gantry roof, and a slip foam deck having a slip foam device.

According to an embodiment of the present invention, a main pump capable of supplying ballast water to a ballast tank of a floating dock on the gantry tower itself can be provided. According to the embodiment of the present invention, when the main pump is installed in the gantry tower itself, the injection amount of the ballast water can be easily managed and the problem of the caisson stability can be solved. Conventionally, a ballast water was injected into each compartment of the floating dock in-line ballast tanks by installing a separate pump in the floating dock in the stage of the caisson launch. However, the process was complicated and the caisson stability problem was caused by the error of the injection amount.

FIG. 10 is an enlarged view of part A of FIG. 9, and is a schematic diagram showing the basic structure of a slip foam apparatus according to an embodiment of the present invention. The slipforming system is equipped with slip deck, which is the working space for the concrete deck, concrete decking and rebar assembly, and the slip form shutter, which is the passage for the repair and inspection of the concrete surface. And a slip form yoke for mating.

A ceiling crane can be installed on the Gentry Tower to supply concrete and reinforcing bars. When the concrete is supplied from the ground to the concrete inlet of the upper deck by using a ceiling crane after supplying the concrete to the hopper, The concrete can be supplied by the mine to the location of the working deck. Assembly of reinforcing bars is also done on the working deck. Short reinforced bars are supplied directly to the working deck, and long reinforced bars and vertical bars can be supplied and assembled from the upper deck. Spacers may be attached to the yoke of the slip foam to maintain the coating of the reinforcing bars.

When the concrete concrete is put in the gantry tower, it is cured for 10 hours to 12 hours, and the slip form shutter is separated from the wall. The finished caisson dismantles the form, repairs the defective part, and performs the completion inspection. The completed caisson completes the completion inspection, floats the floating dock, introduces water into the floating dock, tilts or sinks the floating dock, completes the towing and mounting stage after the caisson launch.

Example

With respect to the embodiment according to the embodiment of the present invention, the load-reduction structural analysis data of the fixed bottom portion and the air and construction cost data according to the reduction of the construction step are described below.

11 is an explanatory view showing load analysis results obtained by comparing the floor reaction force of the conventional art with the embodiment of the present invention. 11 shows the reaction force acting on the bottom surface of the bottom of the bottom of the prior art land preparation site and the method of fabricating the bottom-up precast low plate type caisson using the floating dock according to an embodiment of the present invention, using MIDAS, . As a result, it can be confirmed that the bottom plate of the floating dock is wider than the caisson, so that the load-dispersing effect is applied to the bottom-type pre-cast low plate caisson manufacturing method using the floating dock according to an embodiment of the present invention. Moreover, the fact that the bottom plate is manufactured in a modular form proves to be more effective. More detailed analysis results are shown in Table 1 below.

Conventional land-based production facilities According to an embodiment of the present invention, Load (kN) 35,280.68 50,938.70 Working area (m ² ) 953.53 3,742.74 Load per unit area (kN / m ² ) 37.00 13.61 Percentage (%) 100 36.78

As shown in Table 1, according to the embodiment of the present invention, it can be seen that the load per unit area is only 36.78% of the load per unit area of the prior art. This is because the load acting on the bottom of the caisson is dispersed into a larger area of the floating dock.

As shown in FIGS. 1, 2, 3 and 4, with respect to air and construction cost comparison data due to the reduction of the construction steps, the prior art processes the caisson construction in four stages except for the load-out step. On the other hand, a method of manufacturing a bottom-up precast low-plate type caisson using a floating dock according to an embodiment of the present invention includes a slipform station and a curling station, Only the bottom of the caisson will be modular. If the bottom plate is to be modularly constructed, the concrete can be dried and baked fairly quickly. Therefore, according to the embodiment of the present invention, the ground improvement construction of the caisson manufacturing site is significantly reduced. Table 2 below shows the comparison of the types of works generated by each method and the amount of increase / decrease of the materials.

Work standard unit Original suggestion Increase / decrease percentage Crushed stone mat φ30mm or less mixed aggregate m ³ 3,079 1,360 -1,719 44.17 Sand drain φ40mm m 9,907 0 -9, 907 0 Preload φ30mm or less mixed aggregate m ³ 9,723 3,730 -5,993 36.78

FIG. 12 is a diagram showing changes in the ground improvement area generated according to an embodiment of the present invention. 12, according to an embodiment of the present invention, it is possible to reduce the use space of the ground on the land in the workplace by more than 50%, and it is possible to reduce the construction costs such as the ground improvement cost, the file construction cost, labor cost, equipment usage fee, The savings are expected to be substantial.

FIG. 13 is a diagram illustrating a predetermined process table for each process according to an embodiment of the present invention. As shown in Fig. 13, according to the prior art, only the improvement of the ground in the land preparation field takes more than 20 days, which is the number of working days excluding the holidays and night work days. Particularly in the process of FIG. 9, the sand drain method is the most important step. In the method of manufacturing a bottom-up precast low plate caisson using a floating dock according to an embodiment of the present invention, If the following small scale caissons are required, air can be saved for at least 10 days. Since labor costs and equipment usage costs are a significant part of this, it is anticipated to be an innovative help to reduce overall construction costs.

In conclusion, the production of large-scale caisson structures is now commercially available, and there is a need for measures to reduce air and construction costs. Accordingly, in the present invention, a caisson manufacturing method which has been progressing step by step in the existing land has been modified to propose a method capable of manufacturing most of the processes at sea. According to the embodiment of the present invention, the land area of 50% or more can be reduced compared with the conventional land manufacturing method. Also, a reduction in the progressive process results in a decrease in air for at least 10 days. This is expected to contribute significantly to the overall cost reduction.

Although the present invention has been described based on the slip form for the sake of convenience of description, the scope of the present invention is not limited to the slip form, but includes all configurations that can exhibit similar effects to the slip form recognized by ordinary technicians at the time of filing can do.

As described above, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and from the equivalent concept are to be construed as being included in the scope of the present invention.

1: Caisson
2: Floating dock
10: Production
11: File
12: Gentry Tower
13: Barge
14: Barge
15: Headquarters
16: Gentry Tower
17: Sleeping
18: Tugboat
20: Protective block wall
21: Horizontal piercing type fixing bottom
30: Footing Basics
31: Jack-up leg
100: Modular bottom plate
101: Module
102: fixed line
103: Through hole
104: fastening groove

Claims (7)

A gantry tower in which an inner space is formed by loops and pillars, and which is provided with a vertically movable slip foam for making a caisson;
A water inlet wall configured to surround the gantry tower and to block inflow water flowing from the side of the gantry tower when the caisson is manufactured; And
A barge having the gantry tower and the water wall, the barge being movable in water;
/ RTI >
A plurality of modules each of which is made onshore and constitutes a bottom plate of the caisson are sequentially transferred and seated in the inner space of the gantry tower,
Wherein the plurality of modules are connected by a fixed line passing through each of the plurality of modules, coupled in the inner space of the gantry tower,
Characterized in that the caisson is manufactured in a bottom-up manner by the slip foam in a state of being seated in a recess at a specific position in the water bottom.
The method according to claim 1,
A main water pump provided in the gantry tower and configured to perform ballast water supply to the ballast tank of the barge;
Further comprising:
And the ballast water is introduced into the ballast tank from the main water pump when the caisson is launched. delete delete delete delete delete

Images