KR20110071878A - Method for constructing a foundation using a open caisson - Google Patents

Abstract

PURPOSE: A foundation construction method for a caisson is provided to precisely construct a caisson foundation even with a small capacity lifting device. CONSTITUTION: A foundation construction method for a caisson is as follows. A floater is assembled and put on the water and a caisson is fixed to the floater via a cable(S100). Concrete is placed in the caisson(S110). The caisson and the floater are transferred to the installation positions and guide piles are set(S120). Concrete is placed in the caisson to form a support structure(S130). The cable is removed from the caisson(S140). The water is filled up in the floater to load the caisson(S150). The underwater bottom is excavated and the caisson is settled and supported on the safety ground(S160). The guide piles are removed(S170).

Description

Method for constructing a foundation using a open caisson}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a well basin foundation method, and more particularly, to a well basin foundation method for forming a foundation in water, such as a river or the sea.

The foundation method of the wells is to support a concrete structure with a pre-fabricated well, for example, a hollow cylinder, by sinking to the safety ground below the bottom of the water and the concrete support on the surface of the well. It means the method of forming an underwater foundation by making it. This well foundation method is widely used to construct the foundation of offshore structures such as bridge piers in water such as rivers and seas.

The most commonly used method of forming the foundation of the well by using the well foundation method is to use it in a river or the sea that is not relatively deep. There is a method of sinking while making a hole, but in the water conservation area or the place where the soil cannot be filled because of the deep water, the foundation of the well is constructed by the following process.

First, the outside is made of steel plates so that the concrete can be filled in for the production of the tip of the well, and the steel mold having a space therein is made on the ground. Then, the manufactured steel mold is lifted by the large lifting device installed on the barge and is carried to the installation site where the well base is to be formed while being suspended from the lifting device. The steel mold should be lowered to the bottom of the water by the lifting device in the transported place, but the buoyant force acts because the inside of the steel mold is empty, and the steel mold does not fall to the bottom of the water by this buoyancy. Therefore, while lifting the steel mold with the lifting device, the concrete is filled in the inside of the steel mold, and the weight of the well is lowered and placed on the bottom surface of the water. At this time, the height of the well is formed to a certain degree larger than the depth at the installation position, so that even if the bottom of the well is submerged to the bottom of the water to a certain depth, the top of the well is exposed on the water surface.

Thereafter, formwork is installed at the upper end of the wells exposed on the water surface and concrete is poured to increase the length of the wells. As the length of the well increases in this way, the weight of the well becomes heavier. And, when excavating the soil of the bottom surface of the water contacting the bottom of the well from the inside, the bottom surface that was supporting the well is collapsed and the well is dug into the ground to sink further. Thereafter, the wells are continuously settled by repeatedly performing the process of increasing the length of the wells and the excavation process. If the depth of settlement is increased, there is a limit that can be settled only by the weight of the well, so that heavy objects such as steel are placed on the top of the well to facilitate settlement by the housing. Then, after sinking to the safety ground, for example, bedrock is no longer made the settlement of the well to fill the inside of the well to complete the base of the well.

However, in the case of constructing the well base in a water quality preservation area or a deep water depth area, the steel mold for manufacturing the well tip end part has to be protruded above the water surface when the lower part touches the bottom surface of the water well. The height of is to be made larger than the depth. As such, as the size of the mold increases, the weight becomes heavier, and there is a limit that the lifting device to be lifted has to be enlarged.

In particular, large lifting equipment floats in water and carries water, but if there are obstacles such as dams in rivers or rivers, water movement is impossible.In order to put large lifting equipment, disassemble the equipment and transport it by land. There is a problem in that a large cost is generated in the input of the large lifting equipment because it needs to be reassembled and used.

In addition, in the above-described well-pit construction method, if the bottom of the well is not flat in the process of lowering the well, the bottom of the well is not vertical, so the excavation of the bottom of the water is essential. It must be accompanied by pollution. Therefore, there is a problem in that special measures to prevent water pollution, such as pollution prevention facilities, need to be additionally used in order to use the well construction method in rivers or rivers designated as water quality protection areas.

The present invention has been made to solve the above problems, the object of the present invention, it is possible to precisely construct the well basin base even with a small lifting device in place of large equipment in places where large equipment is difficult to put, and further contaminated water It is to provide a well-basin method to minimize the occurrence of.

In order to achieve the above object, the well basin foundation method according to the present invention includes the steps of (a) inserting the well base portion smaller than the water depth into the opening opening in the vertical direction of the floater floating on the water surface; (b) connecting the well base to the cable wound on the drum installed in the plotter to apply tension to the cable by the load of the well base, and to adjust the length of the cable released from the drum to adjust the length of the well base; Arranging an upper end outside the water surface and a lower end of the well basin base; (c) pouring concrete to an upper end of the well basin foundation to form a support having a predetermined height; (d) further unwinding the cable from the drum to settle the well including the well base and the support, the upper end of the support being disposed outside the water surface; (e) repeating steps (c) and (d) one or more times to increase the size of the well in the vertical direction by forming a plurality of supports in the upper and lower direction at the upper end of the base of the well, Arranging an upper end of the support disposed at the top of the plurality of supports outside of the water surface and supporting the lower end of the well base on a ground submerged to a predetermined depth to the bottom surface of the water or the bottom surface of the water; ; And (f) releasing the connection between the well base and the cable.

Here, the plotter includes a plurality of floating body that is radially disposed and detachably coupled to each other, the opening is preferably formed by the plurality of floating body.

A plurality of first pulley units are coupled to the plotter, and a second pulley unit having the same number as the first pulley units is coupled to the well base part, and the cables include the plurality of first pulley units and the plurality of pulley units. It is preferable to be guided and supported by all of the second pulley unit.

In addition, the plurality of first pulley units and the plurality of second pulley units are preferably arranged radially.

Each of the plurality of first pulley units is paired with each of the plurality of second pulley units to form a plurality of pulley unit pairs, and the cable includes a plurality of pulley units along an arrangement direction of the plurality of pulley unit pairs. It is preferred to be guided sequentially to the pair, respectively.

The first pulley unit may further include: a first housing fixed to the plotter; A pair of first pulleys rotatably coupled to the first housing, the grooves of which the cable is guided are formed on an outer circumferential surface thereof, and parallel to each other; And a plurality of second rotatably coupled to the first housing and having a center of rotation orthogonal to the center of rotation of the first pulley, wherein the grooves to which the cable is guided are formed on the outer circumferential surface and disposed in parallel to each other. A pulley; wherein each of the second pulley units comprises: a second housing coupled to the well base; And a plurality of third pulleys rotatably coupled to the second housing, having a rotation center axis orthogonal to the rotation center axis of the first pulley, and having a groove portion in which the cable is guided is formed on an outer circumferential surface thereof and parallel to each other. It is preferable to include.

And, the second pulley unit is preferably detachably coupled to the base portion of the well.

Here, the base of the well is formed with the same number of lugs as the second pulley unit, the pin member is inserted into each of the second pulley unit and each lug; And driving means for driving the pin members so that the pin members are separated from any one of the second pulley unit and the lug.

In addition, the driving means, the hydraulic actuator having a piston to which each pin member is coupled; A hydraulic pump disposed on the water surface and configured to apply hydraulic pressure to drive the respective pistons; And hydraulic lines connecting the hydraulic actuators and the hydraulic pumps.

On the other hand, according to the present invention, (g) connecting the cable separated from the base of the well to the support of any one of the plurality of supports; (h) filling the interior of the plotter; And (i) sinking the wells by applying a load of water filled in the plotter to the wells by adjusting the length of the cable unwound from the drums. Here, even after the step (i), at least a portion of the support is disposed above the water surface.

According to the present invention, (j) one or more balance tanks of the plurality of balance tanks formed to be separated from each other in the inside of the plotter are filled with water so that the upper surface of the plotter is parallel to the water surface when the well bucket is settled. Maintaining so that it is preferable to further have.

And, according to the present invention, (k) installing a plurality of guide files between the plotter and the well base; And (l) pouring concrete into the well basin foundation before forming the support.

In the conventional well construction method, since the top of the well should always protrude out of the water when the bottom of the well is placed on the bottom of the water, the size of the iron mold for manufacturing the well base, for example, the well end of the well It must be larger, and the deeper it becomes, the larger it becomes. As a result, when the water depth is deepened to some extent, the size of the steel mold becomes too large and cannot be applied. However, in the present invention, unlike the prior art, there is no difficulty in forming a well base even if the height of the well base, that is, the iron die is made small, regardless of the depth, so that the production and transportation of the iron die is easy and further It is not affected by the depth of the well foundation construction.

In addition, unlike the prior art, since the lifting device for lifting the well is not necessary even at the installation position of the well base, the construction of the well base can be made easily and economically.

In addition, there is no need to excavate the bottom surface of the water adjacent to the well can be minimized environmental pollution during the construction of the well.

In addition, by connecting the cable to the top of the well, properly filling the inside of the plotter and pulling the cable, it is possible to apply a load to the tip of the well. Therefore, it is possible to omit the operation of placing a heavy object in order to add a load as in the prior art and can easily apply the load.

And the conventional method is to dig into the ground by the weight of the well, so that the ground is supported deep into the weak side, so there is a disadvantage that it is easy to penetrate while descending according to the state of the ground, according to the present invention At this point, the cable is hung down so that the position can be accurately guided, making it easy to construct the well foundation at the desired level of verticality.

Before describing the well-hole construction method according to the present embodiment in detail, an example of a configuration of connecting the well, the plotter and the well and the plotter with a cable will be described with reference to FIGS. 11 to 14.

The plotter 10 is pre-fabricated on the ground, and includes a plurality of floating bodies 11 detachably coupled to each other. The plurality of floating bodies 11 are arranged radially and are connected to each other to form a closed curve as a whole. The opening 12 opened up and down by the several floating body 11 is formed. Then, the plurality of floating body 11 may be coupled by a coupling structure of various known, such as bolt coupling. The balance tank 111 and the load application tank 112 are formed to be separated from each other inside each floating body 11. The balance tank 111 and the load applying tank 112 are filled with water as necessary.

The well base 20 is made of steel and is made of steel in advance and is called a steel mold. The well base 20 has a double wall structure having an inner wall 21 and an outer wall 22, and an annular space is formed between the inner wall 21 and the outer wall 22. The lower end of the well base 20 is closed to prevent water from entering and the upper end of the well base 20 is open. In addition, the lower end of the well base 20 is formed pointed. A plurality of lugs 23 are formed radially on the outer circumferential surface of the well base 20. Then, through holes 231 are formed through the lugs 23.

The cable connecting structure includes a plurality of first pulley units 30, a plurality of second pulley units 40, and a cable 50.

The plurality of first pulley units 30 are fixed to the plotter 10 to form a radial shape. Each first pulley unit 30 includes a first housing 31, a pair of first pulleys 32, a plurality of second pulleys 33, and a pair of auxiliary pulleys 34.

The first housing 31 is bolted to the plotter 10.

The pair of first pulleys 32 are rotatably coupled to the first housing 31, respectively. The pair of first pulleys 32 rotate about the same rotation center axis and are spaced apart from each other along the rotation center axis. Each first pulley 32 is formed in the same size, the groove portion is formed on the outer peripheral surface of each first pulley 32.

The plurality of second pulleys 33 are rotatably coupled to the first housing 31, respectively. The plurality of second pulleys 33 rotate about the same rotation center axis and are spaced apart from each other along the rotation center axis. The central axis of rotation of the second pulley 33 is orthogonal to the central axis of rotation of the first pulley 32. Each second pulley 33 is formed to have the same size, and a groove portion is formed on the outer circumferential surface of each second pulley 33.

The pair of auxiliary pulleys 34 is disposed between the first pulley 32 and the second pulley 33. Each auxiliary pulley 34 is rotatably coupled to the first housing 31. The central axis of rotation of each auxiliary pulley 34 is parallel to the central axis of rotation of the second pulley. Each auxiliary pulley 34 is formed in the same size, the outer peripheral surface of each auxiliary pulley 34 is formed with a groove.

The plurality of second pulley units 40 are provided to correspond one-to-one with the plurality of first pulley units 30. The plurality of second pulley units 40 are disposed radially around the well base 20. Each second pulley unit 40 includes a second housing 41 and a plurality of third pulleys 42.

The second housing 41 is detachably coupled to the well base 20. The second housing 41 has a through hole 411 which is coaxially connected with the through hole 231 of the lug. The pin member 43 is inserted into the through hole 411 of the second housing and the through hole 231 of the lug, respectively. When the pin member 43 is separated from the through hole 231 of the lug, the second housing 41 is separated from the well base 20.

The plurality of third pulleys 42 are rotatably coupled to the second housing 41. The central axis of rotation of each of the plurality of third pulleys 42 is orthogonal to the central axis of rotation of the first pulley. The plurality of third pulleys 42 are arranged to be spaced apart from each other along the center of rotation thereof. Each of the third pulleys 42 is formed to have the same size, and grooves are formed on the outer circumferential surface of each of the third pulleys 42.

The cable 50 is connected to and supported by both the plurality of first pulley units 30 and the plurality of second pulley units 40. Specifically, the cable 50 is wound around at least a portion of each of the groove of the first pulley 32, the groove of the auxiliary pulley 34, the groove of the second pulley 33 and the groove of the third pulley 42. . In particular, the cable 50 is guided alternately to the first pulley unit 30 and the second pulley unit 40 as shown in FIGS. 12 and 13, respectively. That is, the first pulley unit 30 and the second pulley unit 40 are paired, respectively, and a plurality of pulley unit pairs are formed, and as shown in FIGS. 11 and 13, the cable is disposed in the pulley unit pair direction, that is, right It is sequentially guided to the pulley unit pair along the radial direction of the bucket base 20. In addition, looking at the shape of the cable 50 guided by the first pulley unit 30 and the second pulley unit 40 along the lengthwise direction of the cable, the cable 50 is the first pulley 32 and the auxiliary pulley. The grooves of the auxiliary pulley 34 and the first pulley 32 are in contact with the grooves of the 34 and alternately supported by the grooves of the plurality of second pulleys 33 and the plurality of third pulleys 42, respectively. Is supported in contact with. In particular, the cable 50 is supported below one groove of one first pulley 32 and above one groove of one auxiliary pulley 34 and above one groove of another first pulley 32 and another auxiliary pulley. (34) Supported below the grooves and when viewed from the side as a whole, they look staggered with each other as shown in FIG.

The cable 50 is wound around the winch drum 51 provided in the plotter 10. When the winch drum 51 is rotated to wind or loosen the cable, the length of the cable 50 released from the winch drum 51 can be adjusted. In the present embodiment, a pair of winch drums 51 are provided, and both ends of the cable 50 are connected to the winch drums 51, respectively. Therefore, by controlling the operation of the pair of winch drum 51, it is possible to adjust the length of the cable 50 between the pair of winch drum 51. Here, the cable 50 may be wound or unwound on a winch drum, such as a rope, a wire or a belt, and may be applied to any material or shape if tension is applied thereto.

And, in order to release that the well base 20 is connected and supported by the cable 50 is provided with a separate drive means as shown in FIG.

The driving means includes a hydraulic actuator 61, a hydraulic pump 62, and a hydraulic line 63.

A plurality of hydraulic actuators 61 are provided in the same number as the second pulley unit 40, and are coupled to the second housing 41, respectively. Each hydraulic actuator 61 includes a cylinder 611 and a piston 612 coupled to the cylinder so as to reciprocate linearly. Reciprocating movement of the piston 612 is possible by the hydraulic pressure applied to the cylinder 611, since the configuration of such a hydraulic actuator 61 is already well known, a detailed description thereof will be omitted. The pin member 43 is coupled to the piston 612 via the bracket 613.

The hydraulic pump 62 is installed on the water surface, in particular on the upper surface of the plotter 10. The hydraulic pump 62 is for driving the piston 612 reciprocating linearly by applying hydraulic pressure to the hydraulic actuator 61. When the hydraulic member 62 is operated to release the pin member 43 from the through hole 231 of the lug, the second housing 41 and the lug 23 are separated from each other. The hydraulic pump may be provided in plural to correspond to the number of hydraulic actuators 61, and only one may be provided to simultaneously drive a plurality of hydraulic actuators.

The hydraulic line 63 connects each hydraulic actuator 61 and the hydraulic pump 62 to transfer the hydraulic pressure applied from the hydraulic pump 62 to the hydraulic actuator 61.

Hereinafter, a method of forming a well base using the above-described plotter, well and cable connection structure will be described.

1 is a schematic flowchart of a well basin based method according to an embodiment of the present invention, and FIGS. 2 to 10 are schematic views for explaining the well basin based method shown in FIG. 1.

1 to 10, the well-hole construction method of the present embodiment is a plotter and well base fixing step (S100), concrete pouring step (S110), guide pile installation step (S120), the support forming step (S130), the cable release step (S140), the load application step (S150), the well support step (S160), and the guide file removal step (S170).

In the step of fixing the plotter and the well base (S100), the floating body 11 is manufactured on the ground and then floated near the ground and assembled in the water to complete the plotter 10. Then, a pair of winch drum 51 and a plurality of first pulley units 30 are installed in the plotter 10.

Then, the plurality of second pulley units 40 are disposed so as to face the plurality of first pulley units 30, and the cable 50 is released from the winch drum 51, and as shown in FIG. 50) to the first pulley unit 30 and the second pulley unit 40. When the cable 50 is connected in this way, the cable 50 is connected to the first pulley 32, the auxiliary pulley 34, the second pulley 33, and the third pulley (as shown in FIGS. 12 and 13). 42) respectively.

In addition, the well basin base 20 is also manufactured to an appropriate height. At this time, the height of the well base 20 is made smaller than the water well is installed, unlike the prior art so that the production and transport of the well can be made easily.

When the plotter 10 and the well base 20 are manufactured in this manner, the floater 10 is floated near the ground, and the floater base 20 is lifted using the lifting device 1 installed on the ground. Insert into the opening (12). Then, the plurality of second pulley units 40 are coupled to the well 20. After the cable 50 is connected in this way, when the well base 20 is lowered from the lifting device 1, tension is applied to the cable 50 so that the well base 20 is supported by the cable 50 tension. The floater 10 is locked to a certain degree so that buoyancy acts on the plotter. Thereafter, the connection between the lifting device 1 and the well basin base 20 is released. At this time, the upper end of the well base 20 is necessarily arranged outside of the water surface by appropriately adjusting the length of the cable 50 is released for subsequent work.

In the concrete pouring step (S110), as shown in FIG. 3, the concrete 71 is poured into the well base 20. As such, when concrete is poured, the load of the well base 20 increases, and thus the tension applied to the cable 50 also increases. Thereafter, the concrete well-welling tip 20 is moved to the installation site using a towing boat or the like.

In the guide file installation step (S120), a plurality of guide files 70 are installed between the plotter 10 and the well tip 20 as shown in FIG. The guide pile 70 serves to guide the position of the plotter 10. Guide pile 70 is installed to be embedded in the bottom surface of the water. At the time of installation of the guide pile 70, a well-known loading method, for example, a method of applying a load to the guide pile using a vibrator, a hydraulic jack or the like is used.

In the support forming step (S130), by forming a formwork on the upper end of the well base 20, and by pouring concrete in the formwork to form a support 80 as shown in FIG. The support 80 is formed in an annular shape similar to the well base, and forms the support 80 at an appropriate height and removes the formwork. When the support 80 is formed while partitioning at an appropriate height as described above, the winch drum 51 is operated to unwind the cable 50. As such, when the cable 50 is released, the well including the well base 20 and the support 80 descends. At this time, when the lower end of the well base 20 does not touch the bottom of the water, the operation of the winch drum 51 is controlled to place the upper end of the support on the water surface. And, in the same manner as the support body 80 was formed previously, concrete is placed on the upper end of the support body 80 to further form the support body 80 to increase the overall height of the well.

As such, after forming the support 80 at the upper end of the well base 20, the process of adjusting the length of the cable 50 and lowering the well by the appropriate number of times is repeated, and the upper end of the well base 20 is provided. A plurality of supports 80 can be formed at the upper end, and as shown in FIG. 6, the lower end of the well base 20 is in contact with the bottom surface of the water while the upper end of the support 80 is formed at the top. Can be placed on the surface of the water. Then, when the cable 50 is further released from the winch drum 51 to prevent tension from being applied to the cable, the lower end of the well is penetrated by the load of the well base 20 and the support 80 to penetrate the underwater bottom surface. It enters and is supported by the ground which entered a certain depth from the bottom surface underwater. Of course, even when no tension is applied to the cable 50, the upper end of the uppermost support 80 is to be disposed on the water surface. As described above, when a plurality of supports 80 are formed in the upper and lower directions of the well base 20, and the tension is not applied to the cable 50, the well base 20 and the plurality of supports 80 are provided. Is embedded in the underwater bottom by its own load, at which time the upper end of the support 80 should be exposed above the surface for subsequent work.

In particular, in the support forming step (S130), to control the sinking direction of the well base 20, so that the well base 20 and the support 80 can descend in the vertical direction, that is, the direction perpendicular to the water surface It is important. To this end, it is necessary to properly fill the balance tank 111 of each floating body constituting the plotter 10, as shown in FIG. 6, so that the upper surface of the plotter 10 is kept parallel to the water surface. Do. At this time, the volume of water filled in the balance tank 111 of each floating body may be different from each other. In addition, the process of maintaining the horizontality of the plotter 10 by filling the balance tank 111 with water may be performed simultaneously with the process of lowering the well 20 after the support 80 is formed. After the lowering of the well 20, the well 20 may be measured before the lowering of the crooked compared to the lower and before the lowering of the well is made.

In the cable release step (S140), by separating the second pulley unit 40 from the well base 20, the well base 20 is no longer supported by the cable 50 as shown in FIG. Do not support. Specifically, when the hydraulic pump 62 installed in the plotter 10 is operated to apply hydraulic pressure to the hydraulic actuator 61 through the hydraulic line 63, the piston 612 of the hydraulic actuator is shown in solid line in FIG. 14. Since it is possible to linearly move in the state shown in the virtual line in the state, the coupling between the second housing 41 of the second pulley unit and the lug 23 of the well base. Thus, the cable 50 is completely separated from the well base 20. Then, the separated second pulley unit 40 is recovered and placed in the plotter 10 for the subsequent step S150.

In the load application step (S150), by applying a load to the support 80, the well basin base 20 is further settled. As described above, the structure of the well base 20 and the plurality of supports 80 is no longer settled by its own weight at a point where the load is smaller than the tip end supporting force and the main surface frictional force of the well base 20. . Therefore, by properly applying the load, it is necessary to further sink the well base 20 to the safety ground. To this end, first, the load applying tank 112 of the plotter is filled with water as shown in FIG. 8. Of course, the balance tank 111 may also be filled with water, and in some cases, by adjusting the amount of water to be filled in each balance tank 111 so that the well base 20 may be vertically driven. Then, a plurality of lugs 90 having through holes formed in the support 80 are coupled. Here, the plurality of lugs 90 is equal to the number of lugs 23 formed in the well base 20, and is preferably coupled to the support 80 formed at the uppermost end. In addition, each lug 90 is fixed to the support 80 using a coupling means such as an anchor bolt, but in some cases, when placing concrete part of each lug 90 in advance when the concrete is poured into the support 80 and It may be formed to form a body.

As shown in FIG. 8, after each lug 90 is coupled, the through hole 411 of the second housing of the second pulley unit 40 and the through hole of the lug 90 are coaxial with each other. After the arrangement, the hydraulic pump 62 is operated to insert the pin member 43 into the through hole 411 and the lug 90 through hole of the second housing. Thereafter, the winch drum 51 is rotated to adjust the length of the cable 50 to be loosened. At this time, when the cable 50 is wound and the plotter 10 is completely separated from the water surface, the entire load of the water filled in the plotter 10 is applied to the well. As such, when the plotter 10 is not submerged at all in the water, the load is applied to the well base 20 at the maximum, so that the well base 20 can be settled to the maximum limit, and in some cases, the safety ground You can even get stuck in. Of course, even when the well basin 20 is settled to the maximum, the surface of the support 20 should always be exposed so that at least part of the support 80, for this purpose by pouring concrete according to the degree of settlement of the well 80 May be formed. After sinking the well base 20 as much as possible, the winch drum 51 is loosened so that the tension is not applied to the cable 50, and the second pulley unit 40 is separated.

Thereafter, the assembled annular plotter 10 is released so that it can be moved around the well bucket and used for the construction of the next well bucket.

In the well support step (S160), the bottom surface of the well is excavated in order to sink and support the well base part 20 to the safety ground. For the excavation, the excavation equipment 2 is loaded on the barge 4, and the excavation equipment is excavated near the lower end of the well base by using the bucket 3 of the excavation equipment. When the soil is dug in the middle of the well base, the supporting force of the well base 20 is weakened, and the well is settled again. At this time, depending on the amount of settlement of the well 20, the operation of additionally forming the support 80 so that at least part of the support 80 can be exposed on the water surface can be performed in parallel. By further sinking the well 20 and forming the support 80 in this way, as shown in Figure 9 to support the well 20 to the safety ground, that is, bedrock and at the same time the top of the surface The support 80 can be exposed.

Of course, the excavation in the well support step (S160) is made when the well base is not settled to the safety ground. However, excavation may be made when settlement by the weight of the well is no longer performed. For example, excavation may be made before the load application step (S150).

In the guide file demolition step (S170), when the well basin foundation is completed, all the guide files 70 are removed as shown in FIG. 10.

In the well base construction method comprised as mentioned above, the height of the well base 20 can be manufactured small regardless of the depth. Therefore, the production and transportation of the well base 20 becomes easier. In addition, since the well 20 is supported by the cable 50 connected to the plotter 10, there is no need to lift the mold 20 to a desired position by using a separate lifting device unlike the conventional art. . Therefore, even in narrow places such as rivers or rivers do not use a large lifting equipment it is possible to economically construct the foundation of the well. In addition, since there is no need for a large lifting device, the construction of the well basin can be made very economically.

In addition, since the load can be applied to the wells by filling the plotter 10 with water, it is possible to lower the well base 20 more easily. In addition, since the well can be installed vertically even if the bottom surface is inclined or the support force is different, there is no need to excavate the well installation position in advance flat to minimize the occurrence of environmental pollution during the construction of the well.

In addition, if water is properly filled in the balance tank 111 of each floating body, the well can be lowered perpendicularly to the water when the well is settled down, so that the well can be installed at a desired level of verticality. .

As mentioned above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the technical idea of the present invention. It is obvious.

1 is a schematic flow chart of a well basin foundation method according to an embodiment of the present invention.

2 to 10 is a schematic view for explaining the well-base construction method shown in FIG.

FIG. 11 is a schematic plan view showing a state in which the well basin base shown in FIG. 3 is supported by the plotter by a cable.

FIG. 12 is a schematic side view of the first pulley unit and the second pulley unit shown in FIG. 11.

FIG. 13 is a schematic enlarged view of the first pulley unit and the second pulley unit shown in FIG. 11.

FIG. 14 is a schematic coupling diagram of the second pulley unit and the lug for explaining a process of detaching the second pulley unit from the well base.

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

10 ... plotter 11 ... injured body

12 ... opening 20 ... well base

23,90 lugs 30 ... 1 pulley unit

31 1st housing 32 ... 1st pulley

33 ... 2nd pulley 34 ... secondary pulley

40 ... 2nd Pulley Unit 41 ... 2nd Housing

42 third pulley 50 cable

51.Winch Drum 61 ... Hydraulic Actuator

62.Hydraulic pump 63.Hydraulic line

70 ... guide file 71 ... concrete

80 ... support

Claims (12)

(a) inserting a well basin base smaller than the water depth into an open opening in a vertical direction of a floater floating on the water surface; (b) connecting the well base to the cable wound on the drum installed in the plotter to apply tension to the cable by the load of the well base, and to adjust the length of the cable released from the drum to adjust the length of the well base; Arranging an upper end outside the water surface and a lower end of the well basin base; (c) pouring concrete to an upper end of the well basin foundation to form a support having a predetermined height; (d) further unwinding the cable from the drum to settle the well including the well base and the support, the upper end of the support being disposed outside the water surface; (e) repeating steps (c) and (d) one or more times to increase the size of the well in the vertical direction by forming a plurality of supports in the upper and lower direction at the upper end of the base of the well, Arranging an upper end of the support disposed at the top of the plurality of supports outside the water surface and contacting and supporting the lower end of the well base to a ground submerged at a predetermined depth to the bottom surface of the water or the bottom surface of the water; And and (f) releasing the connection between the well base and the cable. The method of claim 1, (g) connecting a cable separated from the well basin foundation to one of the plurality of supports; (h) filling the interior of the plotter; And (i) subtracting the well by applying a load of water filled in the plotter to the well by adjusting the length of the cable released from the drum, At least a portion of the support is disposed above the surface of the well after the step (i), characterized in that the foundation method. The method of claim 1, (j) filling the at least one balance tank part of the plurality of balance tank parts formed to be separated from each other in the inside of the plotter to maintain the upper surface of the plotter parallel to the water surface when the well bucket is settled; A well basin construction method characterized by including. The method of claim 1, (k) installing a plurality of guide piles between the plotter and the well base; And (l) placing concrete inside the well basin before the support is formed; the well basin foundation method further comprising. The method of claim 1, The plotter includes a plurality of floating body radially disposed and detachably coupled to each other, And the opening is formed by the plurality of floating bodies. The method of claim 1, A plurality of first pulley units are coupled to the plotter, The well base portion is coupled to the same number of second pulley units and the first pulley unit, And the cable is guided and supported by both the plurality of first pulley units and the plurality of second pulley units. The method of claim 6, And the plurality of first pulley units and the plurality of second pulley units are radially disposed. The method of claim 6, Each of the plurality of first pulley units is paired with each of the plurality of second pulley units to form a plurality of pulley unit pairs, And the cable is sequentially guided to each of the plurality of pulley unit pairs along the arrangement direction of the plurality of pulley unit pairs. The method according to any one of claims 6 to 8, Each of the first pulley units, A first housing fixed to the plotter; A pair of first pulleys rotatably coupled to the first housing, the grooves of which the cable is guided are formed on an outer circumferential surface thereof, and parallel to each other; And A plurality of second pulleys rotatably coupled to the first housing and having a rotation center axis orthogonal to the rotation center axis of the first pulley, wherein a groove portion in which the cable is guided is formed on an outer circumferential surface thereof and arranged in parallel with each other; Equipped with Each of the second pulley units, A second housing coupled to the well base; And A plurality of third pulleys rotatably coupled to the second housing, having a rotation center axis orthogonal to the rotation center axis of the first pulley, and having a groove portion in which the cable is guided is formed on an outer circumferential surface thereof and parallel to each other; Well basin foundation method characterized in that. The method of claim 6, And the second pulley unit is detachably coupled to the well base part. The method of claim 10, The well base is formed with the same number of lugs as the second pulley unit, A pin member inserted into each of the second pulley units and each lug; And And a driving means for driving the pin members so that the pin members are separated from any one of the second pulley unit and the lug. The method of claim 11, The driving means includes: A hydraulic actuator having a piston to which each pin member is coupled; A hydraulic pump disposed on the water surface and configured to apply hydraulic pressure to drive the respective pistons; And And a hydraulic line connecting the hydraulic actuators and the hydraulic pumps.

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