KR100847245B1 - A direct base construction method of underwater concrete using a hollow cylindrical steel mold having a buoyancy - Google Patents

Abstract

The present invention is to use the hollow cylindrical steel formwork having a cylindrical buoyancy function as a temporary barrier to construct a concrete direct foundation of the piers on the ground of the water while forming a horizontal connection portion interconnecting a plurality of hollow cylindrical steel formwork Installed on the ground, placing the underwater concrete on the ground inside the hollow cylindrical steel formwork, and keeping the inside of the hollow cylindrical steel formwork dried, and then installing the foundation concrete, When buoyancy is applied to the hollow cylindrical steel formwork by expanding the hollow cylindrical steel formwork in contact with the foundation concrete to the conical portion only in the portion where the concrete is in contact with the water, and conically forming the hollow cylindrical steel formwork with a conical portion at an angle. Hollowed out in contact with foundation concrete The conical part of the cylindrical steel formwork is easily separated from the foundation concrete and floated on the surface by buoyancy, and it is applied to the surface contacting the water and the foundation concrete by applying a water-resistant peeling agent, and when the buoyancy acts on the hollow cylindrical steel formwork, The present invention relates to a method for constructing underwater concrete direct foundation in which the conical part of hollow cylindrical steel formwork in contact with the side of the foundation concrete is easily separated from the concrete pier foundation and floated on the surface of the water to be recovered for reuse.

       In addition, when the conical portion is not easily separated from the underwater and foundation concrete, which is the foundation of concrete pier by buoyancy, due to the frictional force of the soil in contact with the outside or the adhesion between the underwater and the foundation concrete, the cylindrical part inside the hollow cylindrical steel formwork By installing a plurality of buoyancy assisting device to increase the buoyancy acting on the hollow cylindrical steel formwork by using the device to be more easily separated.

       In addition, the bracket installed on the upper layer of steel formwork for buoyancy increase auxiliary device is embedded with steel cable in underwater concrete during construction so that the waterproof function between steel formwork and underwater concrete can be more surely sealed. It also played a role.

In addition, in order to secure the function of friction joint by high-strength bolt, the connection of steel is made without connecting the waterproof material (rubber) to the horizontal connection, so that the frictional force of the joint is not lost. It has waterproof function.

Description

A direct base construction method of underwater concrete using a hollow cylindrical steel mold having a buoyancy}

1 is a view showing the hollow cylindrical steel formwork of the present invention as a whole.

Figure 2 (a) (b) (c) (d) (e) (f) is a view showing a process of constructing a concrete concrete direct foundation by installing the hollow cylindrical steel formwork of the present invention on the ground of the seabed or sea.

Figure 3 (a) (b) shows the buoyancy boosting auxiliary devices respectively installed on the upper portion of the conical section of the hollow cylindrical steel formwork of the present invention, buoyancy so that the conical portion of the hollow cylindrical steel formwork can be easily separated from the underwater and basic concrete surface Figures each showing an embodiment of the device to serve to elevate.

Figure 4 is a view showing the installation of a plurality of buoyancy increase auxiliary device on the inner surface of the hollow conical steel formwork of the present invention.

Figure 5 (a) (b) (c) shows a reinforcing cage assembled in a cylindrical shape of the reinforcing steel rod is installed in the part where the concrete is poured in the hollow conical steel formwork of the present invention, it is installed inside the hollow cylindrical steel formwork Drawing showing the installation process of underwater concrete reinforced with reinforcement by pouring concrete.

Figure 6 is a view showing a vertical section of the connecting portion interconnecting the hollow cylindrical steel formwork of the present invention.

Figure 7 is a view showing a horizontal cross-section of the interconnecting hollow hollow cylindrical formwork of the present invention.

       Figure 8 is a plan view showing a vertical connection to the portion of the joint portion of the steel plate in the vertical direction in the connection of the present invention.

       Figure 9 is a view showing a vertical connecting portion for the portion of the joint portion of the steel plate in the vertical direction in the connecting portion of the present invention.

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

          θ; Cone-shaped inclination angle α; Original insert part wedge angle

         10; Bottom or sea 11; Ground

         20; Hollow cylindrical steel formwork 21; Conical section

         22; Bracing 23; Inner steel

         24; Outer steel 25; Space

         26; Insertion section 27; Waterproof dual release

         28; Water injection 29; Steel Formwork Removal

         32; Underwater concrete 33; basic concrete

         34; Pier 40; Pier Direct Foundation

         41; Reinforced cage 42; rebar

         43; Spacing member 44; concrete

         50; Buoyancy increase aid 51; Strut Strut Bar

         52; Upper pressure plate bracket 53; jack

         54; Band ring 55; Acupressure plate

         56; Anchorage 57; cable

         58; Connection 59; anchor

         60; Horizontal connection 61; Wing plate

         62; Waterproof rubber cap 63; Acupressure plate

         64; Rubber cap fixing bolt nut 65; Reinforcement rib

         66; Bolt 67; nut

         70; Vertical connection 71; Steel plate

   72; High tension bolt 73; Auxiliary steel sheet

The present invention provides a horizontal connection portion vertically interconnecting a plurality of hollow cylindrical steel formwork formed by forming a conical portion of the lower portion of the bottom portion of the hollow cylindrical steel formwork at the same time having a concave portion and a formwork, or vertically Install the connecting portion and the horizontal connecting portion, the side of the water and foundation concrete installed in the lower portion of the hollow cylindrical steel formwork in contact with the conical portion, and then buoyancy acts on the hollow cylindrical steel formwork, the side of the foundation concrete It is a method of constructing underwater concrete direct foundations using hollow cylindrical steel formwork, which is easily separated by the cylindrical formwork of the conical part coated with the water-resistant release agent on the surface and floated on the surface of the water.

In other words, the part where the underwater concrete, which is the lower part of the hollow cylindrical steel formwork, has been used has already been used, and the technique of the present invention uses the inner surface of the hollow cylindrical steel formwork in contact with the basic concrete that is placed on the upper part of the underwater concrete. The conical part is formed by having a constant conical part inclined inward, so that the insertion part, which is the lower end of the hollow cylindrical steel formwork, is also conical, and the conical part, which is the upper part of the insertion part, is also conical.

However, the angle of forming the conical portion and the angle of forming the conical portion is different from each other, and the conical portion of the insertion portion serves as an insertion portion to be mounted on the lower bed rock as the tip of the hollow cylindrical steel formwork, as shown in the drawing. The sub wedge angle is increased to make the tip sharper, and the conical inclination angle of the conical part is less than that of the existing insert wedge angle, so that a gentle inclination angle that can be separated smoothly when buoyancy is applied without affecting the cross-sectional force. It was to have.

In addition, when installing a plurality of steel formwork in the water in order to mount the hollow cylindrical steel formwork to the bottom, forming a horizontal connection to the interconnection connecting a plurality of steel formwork up and down, or when manufacturing a unit steel formwork When manufacturing the curved and cylindrical, the hollow cylindrical steel formwork with vertical connection part installed vertically on the vertical connection part where the width of the iron plate meets vertically, while installing horizontal connection part at the same time to connect the hollow cylindrical steel formwork in water At the time of installation, the joints should be watertight so that seawater or river water does not penetrate into the steel formwork.

In addition, when the hollow cylindrical steel formwork is installed on the lower side and the water and the foundation concrete is poured, and when removing the steel formwork by buoyancy, the conical portion in contact with the basic concrete of the present invention, the frictional force of the soil on the outside of the steel formwork or In case the hollow cylindrical steel formwork is not easily separated because the adhesive force of the part in contact with the basic concrete is greater than the introduced buoyancy, the buoyancy boosting auxiliary device is additionally installed on the upper side of the basic concrete inside the hollow cylindrical steel formwork and buoyant to the steel formwork. At the same time, the buoyancy is instantaneously increased by removing the buoyancy elevating assisting device at the same time, so that the steel formwork is additionally installed to be easily separated and removed from the water and thatch concrete.

In addition, when the hollow cylindrical steel formwork is installed on the lower side, and underwater and foundation concrete is placed, and when the piers are installed on the foundation concrete, reinforcing rods are cylindrically assembled inside the insertion portion of the hollow cylindrical steel formwork where the underwater concrete is installed. The reinforcing cage is installed, and the reinforcing cage is connected to the hollow steel formwork and the reinforcing cage while the reinforcing cage is precisely positioned by joining the steel plate and the space retaining material inside the insert portion at regular intervals. By placing concrete to install underwater concrete, and installing reinforced concrete with reinforced concrete using reinforced concrete than existing concrete without foundation, the foundation under the pier has stronger structural performance. Do it.

The hollow cylindrical steel formwork is formed of a cylindrical upper and lower through-holes to install a bracing connecting the inner steel plate and the outer steel plate to form a space portion of a constant interval, by forming a horizontal connection portion interconnecting a plurality of hollow cylindrical steel formwork To use, but the conical portion of the lower portion of the hollow cylindrical steel formwork to form a cone, and the surface of the inner steel plate of the conical portion and the insertion portion is coated with a water-resistant release agent to a certain thickness.

The construction method of installing the underwater concrete direct foundation on the ground of the water, such as the rock, is made by forming hollow cylindrical steel formwork in the form of cylinder and installing a plurality of hollow cylindrical steel formwork to form a horizontal connecting portion interconnected up and down, or horizontal connecting portion And installing at the same time forming a vertical connection, the insertion portion and the conical portion of the hollow cylindrical steel formwork made of conical portions having different inclination angles, and the hollow hollow cylindrical steel formwork is installed in a position to install a river or sea pier In order to install water on the ground or the ground of the sea while gradually injecting water into the space formed between the inner and outer steel plates, and poured the concrete into the inside of the conical formed in the insert portion of the hollow cylindrical steel formwork, the underwater concrete is poured Keep it dry, Underwater concrete is placed in the conical part, which is a conical part installed on the upper part of the hollow cylindrical steel formwork, and the foundation concrete is poured into the conical part to install the foundation. When installing up to the water surface of the river and the sea while assembling the reinforcing bars for installing the piers and placing the concrete step by step, the water filled between the inner and outer steel plates of the hollow cylindrical steel formwork is gradually removed to buoyancy in the hollow cylindrical steel formwork. This action, so that the hollow cylindrical steel formwork is easily released from the base concrete installed in contact with the cone formed in the conical portion of the hollow cylindrical steel formwork so that the entire hollow cylindrical steel formwork rises above the water surface and can be recovered for reuse. Underwater A concrete method of construction the foundation directly.

The hollow cylindrical steel formwork as a whole is made of a cylindrical penetrating the inside, the inner and outer steel sheet is produced at regular intervals, using a plurality of hollow cylindrical cylindrical steel formwork formed by connecting the horizontal connection to each other, Part of the lower portion of the cylindrical steel formwork to maintain a constant conical inclination angle of the inner steel plate from the outside to the inside, such as the conical portion 21 of Figure 1, the upper portion is retracted and the trumpet-shaped conical portion of the lower portion is extended It is installed.

The lower trumpet-shaped conical portion is installed because it is the most advantageous cross section that can be easily separated by buoyancy from the foundation concrete.

In addition, the hollow cylindrical steel formwork is removed from the basic concrete so that it can be easily floated on the water surface because it does not use any other removal method other than buoyancy, so the buoyancy is naturally introduced and the hollow cylindrical steel formwork must be removed and removed from the basic concrete. An extension with an additional conical inclination angle is formed, in particular an upper portion is retracted and the lower portion is an extended trumpet-shaped extension portion.

The surface of the hollow cylindrical steel plate of the conical portion and the insert portion is coated with a material having a peeling agent and a waterproof function at the same time so that the conical portion formed in the lower portion of the hollow cylindrical steel formwork can be easily separated from the outer surface of the foundation concrete to rise above the water surface do.

In addition, when installing a plurality of steel formwork in the water in order to mount the hollow cylindrical steel formwork to the bottom, forming a horizontal connection to the interconnection connecting a plurality of steel formwork up and down, or when manufacturing a unit steel formwork When manufacturing the curved and cylindrical, the hollow cylindrical steel formwork with vertical connection part installed vertically on the vertical connection part where the width of the iron plate meets vertically, while installing horizontal connection part at the same time to connect the hollow cylindrical steel formwork in water In order to ensure that the connection part has watertightness so that seawater or river water does not penetrate into the steel formwork, the horizontal connection part is installed with bolts and nuts to facilitate the dismantling of the recovered items.

In addition, when the hollow cylindrical steel formwork is installed on the lower side and the water and the foundation concrete is poured, and when removing the steel formwork by buoyancy, the conical portion in contact with the basic concrete of the present invention, the frictional force of the soil on the outside of the steel formwork or In case the hollow cylindrical steel formwork is not easily separated because the adhesive force of the part in contact with the basic concrete is greater than the introduced buoyancy, the buoyancy boosting auxiliary device is additionally installed on the upper side of the basic concrete inside the hollow cylindrical steel formwork and buoyant to the steel formwork. At the same time, the buoyancy is instantaneously increased by removing the buoyancy elevating assisting device at the same time, so that the steel formwork is additionally installed to be easily separated and removed from the water and thatch concrete.

In addition, when the hollow cylindrical steel formwork is installed on the lower side, and underwater and foundation concrete is placed, and when the piers are installed on the foundation concrete, reinforcing rods are cylindrically assembled inside the insertion portion of the hollow cylindrical steel formwork in which the underwater concrete is installed. The reinforcing cage is installed, and the reinforcing cage is connected to the hollow steel formwork and the reinforcing cage while the reinforcing cage is precisely positioned by joining the steel plate and the space retaining material inside the insert portion at regular intervals. By placing concrete to install underwater concrete, and installing reinforced concrete with reinforced concrete using reinforced concrete than existing concrete without foundation, the foundation under the pier has stronger structural performance. Do it.

Therefore, the horizontal connecting portion is installed in accordance with the above conditions to install and support the reinforcing ribs at regular intervals while attaching the wing plate to the outside from each end of the inner and outer steel plates of the hollow cylindrical steel formwork installed above and below, the installed wing plate The upper and lower sides of the wing plate fixed up and down while installing the upper and lower sides, and installed to wrap the outer end of the wing plate installed in contact with the up and down with a waterproof rubber cap, and install a pressure plate on top of the waterproof rubber cap installed on the wing plate, The rubber plate fixing bolt nut is installed through the pressure plate, the waterproof rubber cap, and the wing plate so that the pressure plate, the waterproof rubber cap, and the wing plate are tightly installed integrally.

As described above, the wing plates installed at each end of the inner and outer steel plates of the hollow cylindrical steel formwork are wrapped with a rubber cap, and then a pressure plate is installed on the end portions of the waterproof rubber caps installed on the wing plates to closely connect the pressure plate and the waterproof rubber cap. And the rubber cap fixing bolt nut installed through the pressure plate, the waterproof rubber cap, and the wing plate to be firmly connected. As shown in FIGS. 6 and 7, the waterproof rubber cap is wrapped around the end of the wing plate. The pressure plate is installed on the end of the waterproof rubber cap along the wing plate installed by the circumference of the hollow cylindrical steel formwork so that the end of the waterproof rubber cap installed on the wing plate and the surface of the wing plate are in close contact with each other. And bolts are installed through the pressure plate, waterproof rubber cap and wing plate with rubber cap fixing bolts. The tightness is satisfied by ensuring that the nut and nut are tightly connected, and at the same time, if the bolt and nut are removed, the connection is easily formed so that the watertightness and the disassembly are easily formed.

In addition, as shown in Figures 8 and 9 when manufacturing the inner and outer steel sheet in a cylindrical hollow steel formwork, as the inner and outer steel sheet by bending the installation of the inner and outer steel plates in the mutually jointed parts of the vertical direction to the mutual joint A pair of auxiliary steel plates are installed on each side of each side to form a steel plate joint interconnected with high tension bolts, and the steel plate is covered on the outside of each of the inner and outer steel plates provided with the steel plate joints. Install the waterproof rubber cap in the vertical direction on the surface, and install the pressure plate in the vertical direction on both ends of the waterproof rubber cap, and install the vertical connection part fixed with rubber cap fixing bolts that penetrate the pressure plate and the inner and outer steel plates.

As described above, the installation of the vertical connection part for waterproofing is also to provide a close waterproofing to the hollow cylindrical steel formwork installed in the water.

In addition, when the hollow cylindrical steel formwork 20 is not easily separated from the underwater and basic concrete surfaces installed in contact with the surface of the conical portion of the hollow cylindrical steel formwork 20, the buoyancy force is applied to the inner surface of the hollow cylindrical steel formwork 20. While installing a plurality of ascending aids to be installed in the upper portion of the conical portion to fill the hollow cylindrical steel formwork when buoyancy to fill the water inside the hollow cylindrical steel formwork, while removing the water injected into the space, The buoyancy rise auxiliary device 50 is operated so that the buoyancy is increased at the same time so that the contact portion between the basic concrete placed in the hollow cylindrical steel formwork 20 and the hollow cylindrical steel formwork 20 is more easily separated, thereby allowing the hollow cylindrical steel formwork ( 20) is to be separated easily.

One example of the buoyancy rise auxiliary device 50 is [Fig. 3a] as a plurality of vertically installed in the circumferential direction in the hollow cylindrical steel formwork on the upper portion of the conical portion in which the water and the foundation concrete is poured, constant on the base concrete surface The band ring is attached to the hollow cylindrical steel formwork at regular intervals apart from the distance, and the upper pressure plate bracket is attached to the steel formwork at a certain distance from the band type ring, and the auxiliary strut is installed at the lower part. While inserting the steel bar into the band-shaped ring, the lower pressure plate is in contact with the base concrete surface, the upper portion is to be installed at a predetermined distance from the upper pressure plate bracket, jack between the upper and upper pressure plate bracket of the steel bar To the jack of the auxiliary strut steel by applying pressure to the jack. It is one to more tightly close contact with the base surface of concrete.

Another embodiment is [FIG. 3B], when the hollow cylindrical steel formwork 20 is not easy to separate from the underwater and basic concrete surface installed in contact with the surface of the conical portion of the hollow cylindrical steel formwork 20, hollow cylindrical form The buoyancy increase auxiliary device 50 is installed on the inner surface of the steel formwork 20, so that the buoyancy rises by operating the buoyancy increase auxiliary device 50 when buoyancy acts on the hollow cylindrical steel formwork to be installed on the upper portion of the conical portion. The contact portion of the foundation concrete placed in the hollow cylindrical steel formwork 20 and the hollow cylindrical steel formwork 20 is more easily relaxed so that the hollow cylindrical steel formwork 20 is easily separated.

The buoyancy increase auxiliary device 50 is to expose the upper part of the anchor while the anchor is embedded in the upper portion of the underwater concrete placed in the insert portion of the hollow cylindrical steel formwork, and then connect the cable to the upper part of the exposed anchor, then the foundation concrete To bury the cable and anchor the upper part of the anchor, and to expose the upper part of the anchor connected to the cable, so that the cable is connected to the connection portion installed on the exposed anchor, the other end of the cable inside the hollow cylindrical steel formwork It is fixedly installed as an anchorage on the upper pressure plate bracket installed on the top of the cone.

As the buoyancy is promoted to act more strongly by using the device, the method of operating the buoyancy assisting device of Figure 3a, first examines the attachment state of the cone and the underwater and the base concrete surface, although the cone Even if the waterproof release agent is applied, the buoyancy boosting auxiliary device should be installed if it is determined that the adhesion force of the water and the foundation concrete surface placed in contact with the soil and frictional force or the conical part of the hollow cylindrical steel formwork is greater than the buoyancy. In order to make buoyancy act on the hollow cylindrical steel formwork, the hollow cylindrical steel formwork is filled with water, and the pressure introduced to the jack is released step by step while releasing the water injected into the space to the outside step by step. When the pressing force with the concrete upper surface is released, the pressure plate As the force held down from the upper part of the concrete is momentarily resolved, the buoyancy introduced into the hollow cylindrical steel formwork rises momentarily, so that the conical portion and the underwater and foundation concrete surfaces are easily separated and separated, so that the hollow cylindrical steel formwork can be easily removed. will be.

In another embodiment, the method of operating the buoyancy assisting apparatus of FIG. 3b is to first examine the state of attachment of the conical portion and the underwater and foundation concrete surfaces, even though the waterproofing release agent is applied to the conical portion. If it is determined that the adhesion force of the water and the foundation concrete surface placed in contact with the soil and frictional force or the conical part of the formwork is greater than the buoyancy, install the buoyancy assisting device and make the buoyancy act on the hollow cylindrical steel formwork. In order to fill the inside of the hollow cylindrical steel formwork with water, while draining the water injected into the space to the outside step by step, releasing the anchorage that was connected to the upper pressure plate bracket, and then removing the cable, the basic super concrete and underwater concrete When the power that was buried in anchor anchored disappears, Dunn is the buoyancy force is introduced in a hollow cylindrical steel die instantly rise as one to resolve will stand easily removes a hollow cylindrical steel die because the conical part and the underwater foundation and the concrete surface is easily escape separation.

An object of the present invention is to install a hollow cylindrical steel formwork to have a formwork and a clogging function up and down when installing the bridge foundation of the bridge on the ground or river ground, while horizontally connecting the hollow cylindrical steel formwork installed up and down Forming the connecting portion or installing horizontal connecting portion and vertical connecting portion at the same time, while being installed underwater, the hollow cylindrical steel formwork having a conical section installed expansion portion is installed on the bottom, the hollow cylindrical steel formwork is installed on the ground of the sea and bottom Then, the underwater concrete is poured into the formwork, water is removed, and then the foundation concrete is installed on the underwater concrete, and water is injected between the hollow cylindrical steel formwork while injecting water into the hollow cylindrical steel formwork. Remove water in stages and add to hollow cylindrical steel formwork This action, so that the hollow cylindrical steel formwork of the cone-shaped hollow concrete formwork from the foundation concrete installed in the conical portion of the hollow cylindrical steel formwork to be easily lifted by buoyancy to rise and recover the entire hollow cylindrical steel formwork on the water surface, Underwater concrete direct foundation construction method using hollow cylindrical steel formwork with the buoyancy function installed in the lower part of the hollow cylindrical steel formwork so that the hollow cylindrical formwork can be removed only by buoyancy for easy recovery. have.

Conventionally, when the concrete is installed on the ground using cylindrical caissons having the same inner diameter of upper and lower parts, concrete is laid and the piling foundation is installed, and when the pier is installed, the caisson is mobilized by lifting the caisson to the desired position. Install the caisson by connecting them one by one, then install the pier foundation by laying concrete for the foundation of the pier and the installation of the pier inside, and then, when removing the caisson, a diver enters to dismantle the caisson. Later, lifting the caisson by lifting it with heavy equipment makes the work cumbersome, heavy, and at sea, so the work is very difficult and dangerous, and the work period is long, and it is directly affected by the weather. Disadvantages have existed.

The present invention is to use the hollow cylindrical steel formwork to install the pier foundation on the river or the ground of the sea when the bottom of the hollow cylindrical steel formwork to be included to remove the formwork by buoyancy in addition to the provision of caisson and formwork, which is the role of the existing caisson. When the hollow cylindrical steel formwork is removed after completion of the installation of the basic concrete using the hollow cylindrical steel formwork formed in the conical portion, the portion of the conical portion is in contact with the conical portion by applying buoyancy to the hollow cylindrical steel formwork. Underwater concrete direct foundation method using hollow cylindrical steel formwork with buoyancy function to be easily removed from the side of the foundation concrete by the expanded surface to rise and recover above the water surface.

The present invention is a construction method for installing the underwater concrete direct foundation 40 for the installation of bridges on the ground (11), such as rock,

The hollow cylindrical steel formwork 20 is made into a cylindrical shape to form and install a horizontal connecting portion interconnecting a plurality of hollow cylindrical steel formwork, or install the horizontal connecting portion and the vertical connecting portion at the same time, the lower portion of the hollow cylindrical steel formwork installed at the bottom Is made of an extended conical part 21, between the inner and outer steel plates (23, 24) to install the hollow cylindrical steel formwork 20, the conical part 21 is installed in a position to install a river or sea pier It is installed on the ground 11 of the river or the sea while gradually injecting water into the space 25 formed in the space 25, and the underwater concrete 32 is poured into the insertion portion of the hollow cylindrical steel formwork 20, and maintains the rough state. Then, the foundation concrete 32 is poured on the underwater concrete, which is the inside of the conical portion 21 formed over a predetermined length of the upper portion of the insertion portion, and the piers are placed thereon. Assembling the reinforcing rods for installation and pouring concrete step by step while being installed on the water surface of the river and the sea, while injecting water into the hollow cylindrical steel formwork 20, the hollow cylindrical steel formwork (20) The buoyant force is applied to the hollow cylindrical steel formwork 20 by gradually removing the water filled in the space 25 between the inner and outer steel plates 23 and 24 of the conical portion formed at the lower portion of the hollow cylindrical steel formwork 20. The hollow cylindrical steel formwork 20 of the conical part 21 is easily detached from the water and basic concrete (32, 33) in contact with the (21), so that the entire hollow cylindrical steel formwork (20) rises above the surface to be recovered for reuse. As a method of constructing the underwater concrete direct foundation 40 to be made as shown in FIG.

When the water is removed to pour the foundation concrete 33 into the hollow cylindrical steel formwork 20, the buoyancy acting on the hollow cylindrical steel formwork 20 is so large that the hollow cylindrical steel formwork 20 is about to float. In this case, a rock anchor (not shown) installed over the base 11 and the underwater concrete 32, which are ground 11, is installed, and one end of the rock anchor is protruded to the outside to eventually form the ground and the underwater concrete by the rock anchor. Are in an integrated state to prevent the hollow cylindrical steel formwork 20 from rising by buoyancy.

When installing the hollow cylindrical steel formwork 20 by buoyancy while installing the piers step by step on the foundation concrete 33, the height of the pier rises to a constant height at least above the water surface and then removes the hollow cylindrical steel formwork 20 Do it.

If the pier is on the water surface, it is to ensure that the pier installation work smoothly without being affected by water when the pier is continuously installed.

The hollow cylindrical steel formwork 20 is produced as a cylindrical through the inside as a whole, the inner and outer steel plates (23, 24) are produced at regular intervals, the lower portion of the conical portion 21 of Figure 1 and As such, the inner steel plate 23 is maintained at a constant inclination from the inside to the outside, and the conical portion 21 of the lower end portion is extended in a trumpet shape.

As shown in [FIG. 3] showing an example of substantially applying the hollow cylindrical steel formwork 20 of FIG. 1, the hollow cylindrical steel formwork in contact with the foundation concrete 33 that is poured on the upper portion of the underwater concrete 32 ( The conical part 21 is formed so that the inner surface of 20) has a constant conical part inclination angle, so that the insertion part 26, which is the lower end of the hollow cylindrical steel formwork 20, is also conical. Conical portion 21, which is an upper portion, is to be formed in a conical shape.

However, the conical angle of the insertion portion 26 and the angle of the conical portion 21 are different from each other, and the conical shape of the insertion portion 26 is a tip of the hollow cylindrical steel formwork 20 on the lower bed rock. As shown in FIG. 1, the insertion part wedge angle is enlarged so that the distal end part is made sharper, and the inclination angle of the conical part 21 is less than that of the existing insertion part wedge angle. This is to form a cross section to have a gentle inclination angle that can be separated smoothly when buoyancy is applied without affecting the cross-sectional force.

The conical part 21 is installed in an extended trumpet shape because the hollow cylindrical steel formwork 20 can be easily separated by buoyancy from the base concrete 33.

       On the surface of the inner steel plate 23 of the conical portion 21 is coated with a waterproof release agent 27 to form a conical portion 21 formed on the lower portion of the hollow cylindrical steel formwork 20 is the outer surface of the base concrete 33 It will help you get out of the way and allow you to rise above the surface.

       The reason for installing the conical part 21 in the lower portion of the hollow cylindrical steel formwork 20 as described above is to easily recover by simply buoyancy without mobilizing equipment such as heavy equipment when removing the hollow cylindrical steel formwork 20. In order to reduce the cost of construction by allowing the construction to shorten the construction period.

       In addition, when the hollow cylindrical steel formwork 20 is not easily separated from the underwater and foundation concrete surfaces 32 and 33 provided in contact with the surface of the conical portion 21 of the hollow cylindrical steel formwork 20, that is, the hollow cylindrical form When it is determined that the adhesion force between the soil in contact with the outside of the steel form 20 and the frictional force or the conical portion 21 and the underwater and foundation concrete (32, 33) surface is greater than the buoyancy, the hollow cylindrical steel formwork (20) The buoyancy increase aiding device (50) is installed on the inner surface of the plurality, but the buoyancy increase aiding device (50) when the buoyancy acts on the hollow cylindrical steel formwork 20 to be installed on the upper portion of the conical portion (21) The contact portion between the base concrete 33 placed in the hollow cylindrical steel formwork 20 and the hollow cylindrical steel formwork 20 is more easily relaxed by operating the buoyancy to increase, so that the hollow cylindrical steel formwork 20 is easily separated. It is.

       One example of the buoyancy increase auxiliary device 50 is [Fig. 3a] in the circumferential direction in the hollow cylindrical steel formwork 20 in the upper portion of the conical portion 21 in which the water and the foundation concrete (32, 33) is cast As vertically and vertically installed, the band-type ring 54 is attached to the hollow cylindrical steel formwork 20 at regular intervals away from the surface of the base concrete 33, and from the band-type ring 54. While the upper pressure plate bracket 52 is attached to the steel formwork 20 at a predetermined distance from the upper side, the lower strut steel bar 51 having the pressure plate 55 installed therein is inserted through the band-type ring 54. The lower pressure plate 55 is in contact with the surface of the base concrete 33, the upper portion is to be installed at a predetermined distance from the upper pressure plate bracket 52, the upper portion of the steel bar 51 and the upper pressure plate bracket 52 Interconnect with jack (53) between And jiappan 55 by the action of the pressure in jack 53, the auxiliary strut bar (51) is such that a more tightly in close contact with the concrete base (33) side.

       Another embodiment is [Fig. 3b], the buoyancy increase auxiliary device 50 is anchored (59) in the upper portion of the submerged concrete 32 is placed in the insertion portion 26 of the hollow cylindrical steel formwork 20 While the upper part of the anchor 59 is exposed, while connecting the cable 57 to the upper part of the exposed anchor, and then the foundation concrete 33 is poured to bury the upper part of the anchor 59 and the cable 57, The upper part of the anchor connected with the cable 57 is exposed so that the cable is connected to the connecting part 58 installed on the exposed anchor, and the other end of the cable is a conical part 21 inside the hollow cylindrical steel formwork 20. It is fixed to the upper pressure plate bracket 52 installed at the top of the fixing fixture 56 is installed.

       As the buoyancy boosting assisting device 50 serves to encourage buoyancy to act more strongly, the method of operating the buoyancy boosting assisting device 50 of FIG. 3A is first conical portion 21 and underwater and basic concrete. Investigate the attachment state of the (32, 33) surface, even though the conical portion 21 is coated with a waterproof release agent, in contact with the soil and frictional force or the conical portion 21 in contact with the outside of the hollow cylindrical steel formwork (20) When it is determined that the detachment and removal of the underwater and foundation concrete (32, 33) surface is greater than the buoyancy, it is not possible to remove and remove, the buoyancy rise auxiliary device 50 is installed, the buoyancy in the hollow cylindrical steel formwork (20) Filling the inside of the hollow cylindrical steel formwork 20 so as to act, while gradually draining the water injected into the space 25 to the outside step by releasing the pressure introduced to the jack 53 step by step pressure plate ( 55) and When the pressing force with the upper surface of the super concrete 33 is released, the pressure plate 55 presses the base concrete 33 on the upper portion by the compressive force of the jack 53, thereby releasing momentarily, and thus to the hollow cylindrical steel formwork 20. As the buoyancy is instantaneously raised, the cone 21 and the underwater and foundation concrete 32 and 33 surfaces are easily separated and detached to easily remove the hollow cylindrical steel formwork.

       In yet another embodiment, the method of operating the buoyancy increasing auxiliary apparatus 50 of FIG. 3B firstly examines the attachment state of the cone 21 and the surface of the underwater and foundation concrete 32, 33. Even if the waterproof combined release agent is applied, the adhesion between the soil and the frictional force in contact with the outside of the hollow cylindrical steel formwork 20 or the surface of the water and the foundation concrete (32, 33) placed in contact with the conical part 21 is larger than the buoyancy. If not, the buoyancy boosting aid (50) is to be installed, while injecting water into the hollow cylindrical steel formwork 20 so that the buoyancy acts on the hollow cylindrical steel formwork 20, the space portion 25 When the cable 57 is removed by releasing the fixing unit 56 which has fixedly connected the cable 57 to the upper pressure plate bracket 52 while gradually draining the water to the outside, the basic super concrete 33 and the underwater concrete ( To anchor 59 embedded in 32). The buoyancy force introduced into the hollow cylindrical steel formwork 20 is instantaneously elevated as the force held down from the moment is dissipated momentarily, so that the cone 21 and the underwater and foundation concrete surfaces 32 and 33 are easily separated and separated. The hollow cylindrical steel formwork 20 is to be removed.

       Figure 4 shows from above that a plurality of upper pressure plate bracket 52 is installed in order to install the buoyancy increase auxiliary device 50 in the hollow cylindrical steel formwork 20.

       5 is a hollow cylindrical type to install or install underwater concrete 32 in accordance with the conventional method when placing the underwater concrete 32 in the lower portion of the hollow cylindrical steel formwork 20 reached to the rock; In the inserting portion 26 of the steel formwork 20, a reinforcing bar cage 41 having assembled a cylindrical reinforcing bar 42 corresponding to the inner diameter of the steel formwork 20 is installed, and the inserting portion 26 and the reinforcing bar provided on the outside are provided. In order to interconnect the cage 41 by welding the gap retaining material 43, and then cast concrete 44 to reinforce the reinforcement 42 reinforced concrete 32 can be reinforced to reinforce the strength.

       When the hollow cylindrical steel formwork 20 is installed in water, a plurality of hollow cylindrical steel formwork 20 are connected to each other to form a conical portion 21 of the hollow cylindrical steel formwork 20 up to the ground 11. It is installed, the hollow cylindrical steel formwork 20 to be installed to a certain height to the outside of the water surface.

       Since the hollow cylindrical steel formwork (20) is connected to a plurality of mutually installed in the water, the horizontal connecting portion 60 and the vertical connecting portion 70 interconnecting the inner and outer steel plates (23, 24) of the hollow cylindrical steel formwork is watertight This is naturally required, and should be installed to easily dismantle the horizontal connecting portion 60 or the horizontal connecting portion 60 and the vertical connecting portion 70 for reuse of the hollow cylindrical steel formwork 20 recovered by buoyancy. Doing is also required.

       Therefore, the horizontal connecting portion 60 is installed in accordance with the above conditions, as shown in Figures 6 and 7 the wing plate 61 from the end of the inner and outer steel plates (23, 24) of the hollow cylindrical steel formwork 20 installed above and below the outside. While installing and supporting the reinforcing ribs 65 at regular intervals while installing and installing, while installing the installed wing plate 61 in contact with the upper and lower, and fixed up and down by bolt nuts (66, 67), the upper and lower contact While installing the outer end of the wing plate 61 to surround the waterproof rubber cap 62, it is installed on the wing plate 61 installed up and down, the pressure plate (to the waterproof rubber cap 62 installed on the upper and lower wing plate 61) 63) and a rubber cap fixing bolt nut 64 is installed through the pressure plate 63, the waterproof rubber cap 62, and the wing plate 61 to install the pressure plate 63 and the waterproof rubber cap 64. The wing plate 61 is to be installed tightly fixed integrally.

       As described above, the wing plates 61 installed at each end of the inner and outer steel plates 23 and 24 of the hollow cylindrical steel formwork 20 are wrapped to be covered with the waterproof rubber cap 62, and then installed on the wing plates 61. The pressure plate 63 is installed on the end of the waterproof rubber cap 62 so that the pressure plate 63 and the waterproof rubber cap 62 come into close contact with each other. The pressure plate 63 and the waterproof rubber cap 62 and the wing plate 61 The upper and lower fixed connection to the rubber cap fixing bolt nut 64 installed through), as shown in Figures 6 and 7 install a waterproof rubber cap 62 to surround the end of the upper and lower wing plate 61 While the watertightness is ensured, and also the end of the waterproof rubber cap 62 installed on the wing plate 61 and the surface of the wing plate 61 in close contact with the pressure plate 63 to the circumference of the hollow cylindrical steel formwork 20 On the waterproof rubber cap 62 installed on the wing plate 61 installed along the It is installed by penetrating the pressure plate 63, the waterproof rubber cap 62, and the wing plate 61 with the fixing bolt nut 64 so that it can be firmly connected with the bolt and nut. The horizontal connection portion 60 is easy to be disassembled so that the watertightness and disassembly of the horizontal connection portion 60 are formed.

       In addition, as shown in Figures 8 and 9, when manufacturing the inner and outer steel plates (23,24) in a cylindrical shape to produce hollow hollow cylindrical steel formwork 20, while bending the inner and outer steel plates (23, 24) installed in an arc to abut each other Steel plate joints 71 provided with a pair of auxiliary steel plates 73 on both sides of the inner and outer steel plates 23 and 24, respectively, on the joint portions of the vertical steel plates, and interconnected and secured by high tension bolts 72. And forming a waterproof rubber cap 62 on the steel plate joint so that the steel plate joint 71 is covered on the outside of the inner and outer steel plates 23 and 24 on which the steel plate joint 71 is installed. Direction, and the pressure plate 63 in the vertical direction at both ends of the waterproof rubber cap 62 is installed, and fixed with a rubber cap fixing bolt 64 passing through the pressure plate 63 and each of the inner and outer steel plates. To install the installed vertical connection (70).

       As described above, the installation of the vertical connection part 70 for waterproofing is also performed to closely waterproof the hollow cylindrical steel formwork 20 installed in water.

       In addition, when the hollow cylindrical steel formwork 20 is not easily separated from the underwater and basic concrete surfaces 32 and 33 provided in contact with the surface of the conical portion 21 of the hollow cylindrical steel formwork 20, the hollow cylindrical steel material The buoyancy increase aiding device 50 is installed on the inner surface of the formwork 20, the buoyancy increase aiding device when buoyancy acts on the hollow cylindrical steel formwork 20 by being installed on the upper portion of the cone 21 By operating the (50) so that buoyancy is increased by the buoyancy introduced into the hollow cylindrical steel formwork 20 more easily from the underwater and foundation concrete (32, 33) surface placed in the hollow cylindrical steel formwork (20). The hollow cylindrical steel formwork is easily separated.

       Hereinafter, the configuration and operation of the present invention will be described in detail by the accompanying drawings.

       1 is a view showing the hollow cylindrical steel formwork of the present invention as a whole, the space portion of the regular interval while installing the bracing 22 connecting the inner steel plate 23 and the outer steel plate 24 as a cylindrical upper and lower through parts (25) is formed, and the bracing between the cylindrical inner and outer steel plate is provided so that the space is formed, and the conical portion is installed to maintain the inclined inclination angle from the outside to the inner steel plate 23 over a certain length of the bottom Thus, the upper portion is retracted and the lower portion is extended to a trumpet shape, and the waterproofing release agent 27 is coated on a surface of the inner steel plate of the conical portion 21 at a predetermined thickness.

       Figure 2 (a) (b) (c) (d) (e) (f) is a view showing the process of constructing a concrete concrete direct foundation on the ground of the seabed or seabed hollow hollow steel formwork of the present invention,

       FIG. A is a hollow cylindrical steel formwork 20 and a generally cylindrical hollow cylindrical steel formwork, each having a conical portion 21 and an insertion portion 26 installed on the lower portion thereof, respectively, and a bridge to the cylindrically formed steel formwork. Carrying to the sea and bottom to be installed;

       [Fig. B] is a hollow cylindrical cylindrical shape of the general cylindrical while installing a hollow cylindrical steel formwork 20 formed with a conical portion and the insertion portion on the ground 11 of the position to install the piers of the river or sea 10 In order to install the hollow cylindrical steel formwork while forming horizontal connecting portions interconnecting the steel formwork 20, water is gradually injected into the space portion 25 so as to descend into the water by the weight of the hollow cylindrical form on the ground 11. Installing steel formwork 20;

       [Fig. C] is a step of placing the underwater concrete 32 in the insertion portion of the lower portion of the hollow cylindrical steel formwork 20, and then maintaining the dried state by removing the water inside the hollow cylindrical steel formwork (20);

       FIG. D shows the step of pouring the foundation concrete 33 into the conical part 21 formed on the insertion part of the hollow cylindrical steel formwork 20;

       [Fig. E] is to install a bridge with a certain height by placing reinforcing bars and concrete for the installation of the piers on the upper portion of the base concrete 33, and then injecting water into the hollow cylindrical steel formwork 20, the space part The conical portion 21 formed inside the lower portion of the hollow cylindrical steel formwork 20 while the buoyancy acts on the hollow cylindrical steel formwork 20 by gradually discharging the water injected into the outside to the foundation concrete 33 Escaping from the outer surface portion of the floating surface to recover the water;

       [FIG. F] is to complete the underwater concrete direct foundation 40 by completely removing the hollow cylindrical steel formwork 20 by buoyancy and then installing the piers installed to a predetermined height to a predetermined height;

       The construction is through.

       If the buoyancy acting on the hollow cylindrical steel formwork is too large when the water is removed in order to pour the foundation concrete 33 into the hollow cylindrical steel formwork 20, the ground cylindrical steel formwork tries to injure the ground ( 11) Install a rock anchor (not shown) installed over the bedrock and the underwater concrete (32), but protrudes one end of the rock ranker to the outside to eventually integrate the ground and underwater concrete by the rock anchor The hollow cylindrical steel formwork 20 can be prevented from being floated due to buoyancy.

       The hollow cylindrical steel formwork 20 is produced as a cylindrical through the inside as a whole, the inner and outer steel plates (23, 24) are produced at regular intervals, the lower portion of the conical portion 21 of Figure 1 and As such, the inner steel plate 23 to maintain a constant conical inclination angle from the outside to the inside, the upper portion is retracted and the lower portion is provided with a conical portion 21 in a trumpet-shaped state.

       The lower portion is provided with an extended trumpet-shaped conical portion 21 because the hollow cylindrical steel formwork 20 can be easily separated by buoyancy from underwater and the foundation concrete 32, 33 is the most advantageous cross section.

       In addition, the force to lift the hollow cylindrical steel formwork 20 from the water and the foundation concrete (32, 33) to rise above the surface of the hollow cylinder-shaped steel formwork because only the buoyancy generated in the hollow cylindrical steel formwork (20) The hollow cylindrical steel formwork of the conical part 21 from the underwater and foundation concretes 32 and 33 is naturally installed by installing the conical part 21 of the trumpet-shaped extended state which is advantageous to remove the shape of the lower part of 20). This is to allow (20) to escape.

       At this time, the surface of the inner steel plate 23 of the conical portion 21 is coated with a waterproof release agent 27 to form a conical portion 21 formed in the lower portion of the hollow cylindrical steel formwork 20 is the outer surface of the base concrete 33 It will help you get out of the way and allow you to rise above the surface.

       Figures 3a and b, although applying a waterproof release agent 27 to the conical portion 21 of the hollow cylindrical steel formwork 20 to be easily separated by the force of buoyancy, in which case the conical portion 21 underwater And when the separation from the base concrete (32, 33) surface is not easy to raise the buoyancy force to facilitate the separation and separation to facilitate the buoyancy rise assisting device (50) to further install.

       Figure 3a shows an embodiment of the buoyancy increase auxiliary device 50 in detail, in the circumferential direction in the hollow cylindrical steel formwork 20 on the upper portion of the conical portion 21, the underwater and foundation concrete (32, 33) is cast As a plurality of vertically and vertically installed, the band ring 54 is attached to the inner surface of the hollow cylindrical steel formwork 20 at regular intervals away from the surface of the base concrete 33, and the band ring ( 54, the upper acupressure plate bracket 52 is attached to the inner surface of the hollow cylindrical steel formwork 20 at a predetermined distance from the upper portion, and then the auxiliary strut steel bar 51 having the acupressure plate 55 is installed at the lower portion thereof. While inserting through 54, the lower pressure plate 55 is in contact with the surface of the base concrete 33, the upper portion is to be installed at a predetermined distance from the upper pressure plate bracket 52, the upper part of the steel bar 51 And upper paper The jack 53 is installed between the platen brackets, and the pressure plate 55 connected to the lower portion of the auxiliary strut steel bar 51 by applying pressure to the jack 53 is to be in close contact with the surface of the base concrete 33. .

The operation method for promoting the buoyancy by using the buoyancy increase auxiliary device 50 to act more strongly, first investigate the attachment state of the cone 21 and the underwater and foundation concrete surfaces (32, 33) Even though the waterproof combined release agent 27 is applied to the conical portion 21, it is determined that the conical portion 21 of the hollow cylindrical steel formwork 20 and the underwater and basic concrete surfaces 32 and 33 are not easily separated. If necessary, the buoyancy increasing auxiliary device 50 is installed, while injecting water into the hollow cylindrical steel formwork 20 so that the buoyancy acts on the hollow cylindrical steel formwork 20, in the space 25 there is
The pressure plate 55 is released by the compression force of the jack 53 when releasing the pressure between the pressure plate 55 and the upper surface of the base concrete 33 by releasing the pressure introduced to the jack 53 while gradually draining water to the outside. As the force holding the foundation concrete 33 at the upper part is momentarily resolved, the buoyancy force introduced into the hollow cylindrical steel formwork 20 is instantaneously raised to conical section 21 and the surface of water and foundation concrete (32, 33). The hollow cylindrical steel formwork is removed by being easily separated and separated.

       Another embodiment is [Fig. 3b], the buoyancy increase auxiliary device 50 is anchored (59) in the upper portion of the submerged concrete 32 is placed in the insertion portion 26 of the hollow cylindrical steel formwork 20 While the upper part of the anchor 59 is exposed, while connecting the cable 57 to the upper part of the exposed anchor, and then the foundation concrete 33 is poured to bury the upper part of the anchor 59 and the cable 57, The upper part of the anchor connected with the cable 57 is exposed so that the cable is connected to the connection portion installed on the exposed anchor, and the other end of the cable is the conical portion 21 of the inside of the hollow cylindrical steel formwork 20 It is fixedly installed in the upper acupressure plate bracket 52 installed on the top as a fixing unit 56.

       The method of manipulating the buoyancy force more strongly by using the buoyancy increasing assistance device 50 first examines the attachment state of the conical part 21 and the underwater and foundation concrete 32, 33 surfaces, even though the conical part is waterproof. Even if the combined release agent is applied, the soil and frictional force in contact with the outside of the hollow cylindrical steel formwork 20 or the adhesion force of the water and foundation concrete (32, 33) surface in contact with the conical part 21 cannot be separated because of buoyancy. In this case, the buoyancy rise auxiliary device 50 is to be installed, the buoyancy is filled with water inside the hollow cylindrical steel formwork 50 in order to act on the hollow cylindrical steel formwork 20, the space portion 25 When the cable 57 is removed by releasing the fixing unit 56 which has fixedly connected the cable 57 to the upper pressure plate bracket 52 while draining the water injected into the outside step by step, the basic superconcrete 33 and underwater Conk The buoyancy introduced into the hollow cylindrical steel formwork 20 is instantaneously raised as the force held by the anchor 59 buried in the trough 32 momentarily rises, and the cone 21 and the underwater and foundation concrete 32 , 33) to easily remove the hollow cylindrical steel formwork (20) as the surface is easily separated and separated.

       Figure 4 shows from above that a plurality of upper pressure plate bracket 52 is installed in order to install the buoyancy increase auxiliary device 50 in the hollow cylindrical steel formwork 20.

       Figure 5 (a) (b) (c) is installed by placing the rootless concrete in accordance with the conventional method when placing the underwater concrete 32 in the lower portion of the hollow cylindrical steel formwork 20 reached to the rock In order to install the underwater concrete 32, the reinforcing cage 41 in which the cylindrical rebar 42 corresponding to the inner diameter of the steel formwork 20 is assembled in the inserting portion 26 of the hollow cylindrical formwork 20 is installed. Then, the welding portion is fixed by the gap retaining material 43 to interconnect the insertion portion 26 and the reinforcing cage 41 installed on the outside, and then poured concrete 44 to reinforce the underwater concrete 32 reinforced with reinforcing steel 42 ) Can be poured to reinforce strength.

       As for the horizontal connecting portion interconnecting the hollow cylindrical steel formwork, as shown in the vertical section of the connecting portion of Figure 6 and the horizontal cross section of Figure 7, the inner and outer steel plates 23, the hollow cylindrical steel formwork 20 installed up and down While installing the wing plate 61 from the end of the 24 to the outside to install and support the reinforcing rib 65 at regular intervals, while installing the installed wing plate 61 in contact with the upper and lower bolt nut 66, 67) is fixed up and down, and installed on the wing plate 61 installed up and down while installing the outer end of the wing plate 61 installed to be in contact with the top and bottom with a waterproof rubber cap 62, and the wing plate (up and down) The pressure plate 63 is installed on the waterproof rubber cap 62 installed at 61, and the rubber cap fixing bolt nut 64 is installed through the pressure plate 63, the waterproof rubber cap 62, and the wing plate 61. Pressure plate 63 and waterproof rubber cap ( 64) and the wing plate 61 is to be tightly installed integrally.

       Since the horizontal connection portion is to install a plurality of hollow cylindrical steel formwork 20 in the water, the connecting portion 60 interconnecting the inner and outer steel plates (23, 24) of the hollow cylindrical steel formwork requires watertightness of course. It is also required to be installed so that the horizontal connecting portion 60 can be easily disassembled for reuse of the hollow cylindrical steel formwork 20 recovered by buoyancy.

       Therefore, the horizontal connection portion 60 installed according to the above conditions is installed to surround the wing plate 61 installed at the ends of the inner and outer steel plates 23, 24 of the hollow cylindrical steel formwork 20 with a waterproof rubber cap 62. Next, the pressure plate 63 is installed on the end of the waterproof rubber cap 62 installed on the wing plate 61 so that the pressure plate 63 and the waterproof rubber cap 62 come into close contact with each other, and the pressure plate 63 and the waterproof rubber The rubber cap fixing bolt nut 64 is installed to penetrate the cap 62 and the wing plate 61 so as to be fixed up and down firmly. As shown in FIGS. 5 and 6, the ends of the upper and lower wing plates 61 are enclosed. In order to ensure watertightness by installing the waterproof rubber cap 62 so as to ensure watertightness, the pressure plate 63 is hollowed so that the end portion of the waterproof rubber cap 62 installed on the wing plate 61 and the surface of the wing plate 61 are in close contact with each other. Room installed on wing plate 61 installed along the circumference of cylindrical steel formwork 20 To be installed on the rubber rubber cap 62, and installed through the pressure plate 63, the waterproof rubber cap 62 and the wing plate 61 with a rubber cap fixing bolt nut (64) and securely connected with bolts and nuts Therefore, the tightness is satisfied and at the same time simply remove the bolts and nuts, so that the horizontal connection portion 60 is easily formed so that the watertightness and disassembly can be easily disassembled.

       In addition, when manufacturing the inner and outer steel plates 23 and 24 in a cylindrical shape as shown in Figures 8 and 9 to produce hollow hollow cylindrical steel formwork 20, while bending the inner and outer steel plates 23, 24 installed in an arc, the vertical contact with each other A pair of auxiliary steel plates 73 are respectively provided on both sides of each of the inner and outer steel plates at the joint portions of the steel sheets in the direction, and the steel plate joints 71 fixed and interconnected with the high tension bolts 72 are formed. The waterproof rubber cap 62 is installed on the steel plate joint in a vertical direction so that the steel plate joint 71 is covered on each of the inner and outer steel plates on which the joint 71 is installed. Acupressure plate 63 is installed at both ends in the vertical direction, and the vertical connection portion 70 is fixed by rubber cap fixing bolts 64 passing through the pressure plate 63 and the inner and outer steel plates, respectively.

       As described above, the installation of the vertical connection part 70 for waterproofing is also performed to closely waterproof the hollow cylindrical steel formwork 20 installed in water.

       In order to produce the horizontal connecting portion interconnecting the unit hollow cylindrical steel formwork up and down and the unit hollow cylindrical steel formwork, the vertical connection portion bent in an arc to install the steel sheet in contact with each other is a connection for waterproofing.

       In addition, when connecting the unit hollow cylindrical steel formwork up and down, the horizontal connecting portion may be installed only or the vertical connecting portion may be installed and used at the same time.

The present invention provides a hollow cylindrical steel formwork provided with a cone-shaped portion having an expansion portion at the bottom, while also having a formwork and a clogging function when installing the bridge foundation of the bridge on the river or sea ground, on the sea and river bed After the hollow cylindrical steel formwork is installed, the concrete is placed inside the formwork, the water is removed, the foundation concrete is installed on the underwater concrete, and the steel formwork is injected while injecting water into the hollow cylindrical steel formwork. The buoyancy is applied to the hollow cylindrical steel formwork by gradually removing the water injected between the space portions of the hollow formwork, and the hollow cylindrical steel formwork of the hollow cylindrical formwork is introduced from the outer surface of the foundation concrete installed inside the lower hollow cylindrical steel formwork. Hollow cylindrical steel above the surface It is a hollow cylindrical steel formwork with economical and work efficiency improved buoyancy function that makes it easy to recover for reuse by removing hollow hollow steel formwork from buoyancy only by buoyancy. Underwater concrete direct foundation method used.

Claims (8)

In the method of constructing underwater concrete direct foundation on the ground or seabed using steel formwork,       The hollow cylindrical steel formwork 20 and the general cylindrical hollow cylindrical steel formwork, each having a conical portion 21 and an insertion portion 26 installed on the lower portion thereof, are manufactured, respectively, and the bridges are installed to the cylindrical cylindrical formwork 20, respectively. Transporting to the sea and the seabed to be desired;        While installing the hollow cylindrical steel formwork 20 formed with a cone-shaped portion in the lower portion on the ground 11 of the position to install the pier of the river or the sea 10, the common cylindrical hollow cylindrical steel formwork 20 is interconnected In order to install the hollow cylindrical steel formwork while forming a horizontal connection part, water is gradually injected into the space 25 formed by interconnecting the inner and outer steel plates 23 and 24 with the bracing 22 to descend into the water by its own weight. Installing a hollow cylindrical steel formwork 20 on the ground 11;        In the lower portion of the hollow cylindrical steel formwork 20 coated with a water-resistant combined release agent 27 is placed in the water concrete 32, and then remove the water inside the hollow cylindrical steel formwork 20 to dry the state Maintaining;        Placing the foundation concrete 33 in the conical part 21 coated with the waterproof release agent 27 formed on the insertion part of the hollow cylindrical steel formwork 20;        After installing reinforcing bars and concrete for the installation of the piers on the upper part of the foundation concrete 33, and installing the piers having a predetermined height, the water is injected into the hollow cylindrical steel formwork 20, in the space 25 The conical portion 21 formed in the lower inner side of the hollow cylindrical steel formwork 20 is separated from the outer surface portion of the foundation concrete 33 while the injected water is discharged to the outside so that buoyancy is applied to the hollow cylindrical steel formwork 20 gradually. To rise above the surface to recover;   Hollow core having a buoyancy function characterized in that the hollow cylindrical steel formwork 20 is completely removed by buoyancy, and then the piers installed to a predetermined height are installed to a predetermined height to complete the underwater concrete direct foundation 40. Underwater concrete direct foundation method using cylindrical steel formwork. The method of claim 1, The conical portion 21 is formed over a certain length on the upper portion of the insertion portion of the hollow cylindrical steel formwork 20, so that the inner steel plate 23 to maintain a constant conical inclination angle from the outside to the inside, the upper portion is retracted and the lower portion is Underwater concrete direct construction method using hollow cylindrical steel formwork with buoyancy function characterized by being installed in an extended trumpet shape. delete The method of claim 1, As further installed a plurality of buoyancy rise auxiliary device 50 vertically across the inner circumferential surface of the hollow cylindrical steel formwork 20, the buoyancy rise auxiliary device 50 is a predetermined distance from the base concrete 33 surface The band-shaped ring 54 is attached to the inner surface of the hollow cylindrical steel formwork 20, and the upper pressure plate bracket 52 is positioned at an upper portion away from the band-shaped ring 54 by the hollow cylindrical steel formwork 20. After attaching to the surface, while inserting the sub strut steel bar 51 having the acupressure plate 55 installed therein into the band ring 54, the acupressure plate 55 installed at the lower part of the sub strut steel bar has a base concrete ( 33) abutting the surface, the upper portion of the auxiliary strut steel bar is to be installed at a predetermined distance from the upper acupressure plate bracket 52, the jack 53 between the upper and upper acupressure plate bracket of the auxiliary strut steel bar (51). Install and remind A hollow cylindrical steel formwork having a buoyancy function is characterized in that the pressure plate 55 installed on the lower portion of the auxiliary strut steel bar 51 is brought into close contact with the surface of the base concrete 33 by applying pressure to the jack 53. Underwater concrete direct foundation method using The method of claim 4, wherein As another embodiment of the buoyancy lifting auxiliary device 50, the buoyancy lifting auxiliary device 50 is anchored (59) in the upper portion of the submerged concrete 32 placed in the insert portion 26 of the hollow cylindrical steel formwork 20 While the upper part of the anchor 59 is exposed, the cable 57 is connected to the upper part of the exposed anchor, and then the foundation concrete 33 is poured to bury the upper part of the anchor 59 and the cable 57. However, by exposing the upper portion of the anchor connected to the cable 57, so that the cable is connected to the connecting portion 58 provided on the exposed anchor, and in the conical portion 21 of the hollow cylindrical steel formwork 20 Underwater concrete direct foundation construction method using hollow cylindrical steel formwork with buoyancy function characterized in that one end of the cable 57 is fixedly connected to the fixing unit 56 installed on the upper pressure plate bracket (52) installed on the top. The method of claim 1, The underwater concrete 32 installed in the insertion section 26 installs a reinforcing cage 41 in which a cylindrical rebar 42 corresponding to the inner diameter of the hollow cylindrical steel formwork 20 is assembled, and the insertion section 26 is provided. Underwater concrete direct foundation construction using hollow cylindrical steel formwork with buoyancy, which is characterized in that the inner side and the reinforcing cage 41 are fixed by welding each other with a gap retaining material 43 and then installed by placing concrete 44. Way. The method of claim 1, The horizontal connecting portion 60 is attached to the wing plate 61 from the end of each of the inner and outer steel plates 23 and 24 of the hollow cylindrical steel formwork 20 installed above and outside while reinforcing ribs 65 at regular intervals. ) Is installed and supported, the upper and lower connections are fixed by bolt nuts (66, 67) while the installed wing plate (61) is in contact with the top and bottom, and the outer end portion of the wing plate (61) installed in contact with the top and bottom is waterproof rubber. The pressure plate 63 is installed on the wing plate 61 installed up and down while being installed so as to surround the cap 62, and the waterproof rubber cap 62 is installed on the wing plate 61 installed up and down. 63), the rubber cap fixing bolt nut 64 is installed through the waterproof rubber cap 62 and the wing plate 61 so that the pressure plate 63, the waterproof rubber cap 64 and the wing plate 61 are tightly integrated. Hollow cylindrical steel jagger with buoyancy function characterized by being fixedly installed Underwater foundation construction method using concrete directly home. The method of claim 1, When manufacturing the hollow cylindrical steel formwork 20, the inner and outer steel plates 23 and 24 are bent in an arc, and a pair of auxiliary steel sheets are respectively provided on both sides of the inner and outer steel plates 23 and 24, respectively, in the vertical joint portions where the steel sheets are in contact with each other. (73) is provided, and the steel joint (71) formed by interconnecting with high tension bolts (72) is formed, and the outer side of each of the inner and outer steel plates (23, 24) on which the steel joint (71) is installed The waterproof rubber cap 62 is installed in the vertical direction so that the steel plate joint 71 is covered, and the pressure plate 63 is installed at both ends of the installed waterproof rubber cap 62 in the vertical direction. Underwater concrete directly using hollow cylindrical steel formwork with buoyancy function characterized by further installing a vertical connection part 70 fixedly installed with 63 and rubber cap fixing bolts 64 penetrating each of the inner and outer steel plates. Basic construction method.

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