JP5172519B2 - Support for formwork retention - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a support for holding a formwork, and more specifically, mortar injection and resin for repairing a concrete girder, and mortar and resin for construction of an anticorrosion work for a concrete T-girder or I-girder internal rebar. The present invention relates to a structure for supporting a formwork for supporting the formwork, which is used for pouring or the like or placing repair concrete.

  Concrete structures used in corrosive environments are protected by internal anticorrosion in order to protect their internal rebars and increase the life and safety of the structure. It is used for awards (for example, see Patent Documents 1 and 2).

  When applying external power supply type anticorrosion to a concrete structure, a groove is formed on the outer surface of the concrete member by cutting or the like, an anode is mounted in the groove, this is insulated from the outside, and an electrode is applied to the anode. To be able to. For this reason, it is necessary to cover the groove in which the anode is embedded with mortar.

  The place where the anode is buried is often the lower surface or side surface of the girder or the lower surface of the floor slab, and mortar filling requires careful use of a mortar filling formwork.

  Conventionally, there have been cases where it has been necessary to inject mortar, epoxy resin, or the like to repair cracks in concrete girders, piers, etc., missing parts of concrete, etc., or to place repair concrete.

Conventionally, as a scaffolding for filling mortar in the anode buried part for the cathodic protection work on the lower and side surfaces of the T-girder or I-girder and other parts, wood such as slabs is processed on-site and handed over to the girder. Supporting work was formed by connecting with screws. For this reason, the balance of the support works as a whole is poor, the strength is weak, the force to hold down the mortar filling form is weak, and the support occupies a large proportion of the work space. In addition, there is a problem that it takes time and effort to construct and remove the support works.
JP 2001-11666 A Japanese Patent No. 4008891

  When applying anti-corrosion work to concrete T or I girders, since a large amount of wood was conventionally processed on-site to form a support structure as a scaffold, construction was difficult and the support work was constructed and removed. It takes time and effort, is inefficient, and there is a problem in securing the work space. In addition, when wood is stored for a long period of time, it is corroded and its strength is lowered. An object of this invention is to provide the support for a form holding which solved such a problem.

  The present invention has been made in order to solve the above-described problems. The technical means includes a locking member that locks on the concrete on the lower surface side of the girder, and a plurality of upward-opening cores suspended from the locking member. It is a support for holding a formwork, which is composed of a U-shaped shaped steel support material and a support member that spans the plurality of shape steel support materials and supports the formwork.

  Here, in the present invention, the shape steel refers to angle steel, groove steel, and the like.

  The formwork holding support of the present invention is mainly applied to concrete girders. For example, the upper, lower and side surfaces of the lower flange of a T-girder or I-girder, the side surface of the web, and the haunch of the upper flange Suitable for injecting mortar when constructing anodes for cathodic protection to be buried in one or more positions selected from the part, injecting mortar or resin when repairing (cracking or missing) girders, or placing repair concrete Used. Further, the present invention is widely applicable not only to such an anticorrosion work and repair of girders, but also to injection of mortar, epoxy resin, etc. at the time of cross-sectional repair of offshore structures (piers, etc.) or placement of repair concrete. It is possible to apply.

  Since the support for holding the form of the present invention is a support mainly made of shape steel, it has high strength and durability, can be used repeatedly, can be easily installed and removed, and can be handled by one person. Is possible. In addition, the shape steel is strong, the balance of the assembled support for holding the formwork is good, and the force to hold the formwork is strong. Thereby, the outflow of the mortar due to insufficient press of the mortar filling form, for example, could be reduced.

  In the formwork holding support according to the present invention, the locking member is a suspension part placed on the upper surface of the lower flange of the girder, and the support member supports the formwork and the shape steel support material and the girder. A support fixing jack interposed between them is preferable. In this way, it is equipped with a suspension part to be placed on the upper surface of the lower flange of the girders, and the support for fixing the formwork is easily attached to the girders by extending the support work fixing jack between the shape steel support materials and the girders. And it is fixed securely.

  Further, in the support for holding the formwork using the locking member as a suspension, the suspension is attached to the open end of the U-shaped shaped steel support so as to be detachable or rotationally fixed, If the shape steel support material is composed of two shape steel members hanging from the suspension part and a horizontal combined shape steel material that removably rigidly connects the vicinity of the lower ends of the two shape steel materials. It is more preferable. Rotating and fixing is possible with bolts and nuts, etc., and can be mounted and removed by attaching it with one bolt and nut so that it can be rotated and fixed with another bolt and nut. Easy. In addition, it is preferable that the storage space is small by disassembling the suspended portion, the two shape steel materials, and the horizontal combined shape steel material during storage.

  In addition, the support for holding the formwork using the locking member as a suspension part supports the receiving material that receives the lower end of the pier that supports the formwork installed on the hunch part of the upper flange of the girder on the upper surface of the suspension part. When the portion is provided, it is easy and reliable to install the pier, and it is easy to inject mortar, epoxy resin, or the like of the haunch portion, which is preferable.

  Further, in the support for holding the formwork of the present invention, the locking member is a bracket attached to the concrete surface on the lower surface side of the girder. Can be easily and reliably fixed to the beam.

  In the conventional construction method, 2mm, 3mm, piers and other timber had to be processed on site and used. However, because the support for the formwork support of the present invention is mainly made of shaped steel, Use less. In addition, the conventional construction method has difficulty in diverting the material, but the support for holding the form of the present invention can easily divert the material. Therefore, it is very effective in terms of economy and environment.

  In addition, since the support for holding a form of the present invention can take up a larger working space than before, it is easy to work. In addition, no processing is required and less transport material is required than the conventional method. Therefore, the work process can be shortened.

  Hereinafter, as a first embodiment of the present invention, a support for a girder's cathodic protection will be described as an example. Prior to this description, the problems of the above-mentioned conventional girder support for the anticorrosion work will be analyzed with reference to FIG.

  FIG. 7 is a front view of a girder in which a supporting girder 900 for a conventional girder is installed.

  As shown in FIG. 7, in the construction of the conventional cathodic protection support 900, a square member (for example, a three-dimensional corner) 90 is cut according to the distance between the girders 81 and 82 and the width of the lower flanges 811 and 821. After cutting the square member 90, a process for making a hole through which all the screws 95 pass is performed. The square members 90 are arranged at a pitch of about 2 m, and the square members 90 are connected using all screws 95. Another square member 91 is passed in the direction of the bridge axis, the pier 92 is erected using this another square member 91 as a base, and the mortar filling form 40 is pressed.

  After installation of the mortar filling formwork, the mortar is injected with a manual pump, for example, at a pressure of 0.1 Mpa to 0.2 Mpa, and after the mortar is cured, the pier 92 is removed, and the mortar filling formwork 40, the support for the anticorrosion work 900 Dismantle in order.

  In the conventional cathodic protection support 900 described above, a lot of wood such as the square members 90 and 91 and the pier 92 is used, and these woods must be cut on the spot and processed such as drilling. . Thus, since the wood is processed locally, it is difficult to divert the cathodic protection support 900.

  In addition, in the conventional anticorrosion support 900, a large number of workers are required to assemble the anticorrosion support 900, and it takes time to assemble using the square members 90, 91 and all screws 95. It takes effort. Further, since the square members 90 and 91 are simply connected by all the screws 95, the balance is poor, and the square members 91 passing in the bridge axis direction must be fixed with nails or the like.

  In addition, the proportion of the support material in the work space is large, and when mortar injection work or movement of position, it is difficult to work, all the screw parts are unstable, and the strength is weak, so the mortar when it is stretched by the pier 92 The force for pressing the filling mold 40 is weak. Since the force to hold down the mortar filling form 40 was weak, the mortar flowed out frequently and the injection operation failed in many cases.

  In addition, since most of the support material for the conventional anticorrosion work is wood, the conventional protection work 900 is not only difficult to divert to the next time but also has a reduced strength due to corrosion when stored for a long period of time. There are many bulky things such as squares of objects, and a wide storage space is required.

  The present invention solves such a conventional problem, and hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a girder 20 in which a support 100 for an anticorrosion work, which is a first embodiment of the present invention, is installed.

  1 is selected from the upper surface 211, the lower surface 212, and the side surface 213 of the lower flange 21 of the reinforced concrete girder 20, the side surface 231 of the web 23, and the hunch portion 221 of the upper flange 22. As shown in FIG. In addition, it is a support for holding the formwork used for mortar injection at the time of construction of an anode for an anticorrosion work embedded in a plurality of positions.

  This anticorrosion support 100 includes a suspension 111 placed on the upper surface 211 of the lower flange 21 of the girder 20, and a plurality of U-shaped support members made of U-shaped members that are suspended upward from the suspension 111. 110 and a simple jack 120 that spans a plurality of shaped steel support members 110 and supports the mortar filling form 40. The shape steel support material 110 is composed of two shape steel materials 112 and 113 and a combined shape steel material 114. Moreover, the suspension part 111 and the shaped steel support material 110 are entirely subjected to rust prevention treatment, and have high durability.

  The suspension part 111 is a locking member placed on the upper surface 211 of the lower flange 21 of the reinforced concrete beam 20 and is a member formed by processing, for example, L-shaped steel. In addition, on the upper surface of the suspension part 111, a receiving material (for example, a square member of 2 inch square etc.) 141 that receives the lower end of the pier 130 that supports the mortar filling form frame 40 installed on the haunch part 221 of the upper flange 22 of the girder 20 is provided. Grooves 1111 for positioning and supporting are formed. Further, a rubber plate 30 is attached to the portion of the suspension portion 111 that is in contact with the upper surface 211 of the lower flange 21 of the girder 20 for suspension. This rubber plate 30 serves to prevent damage to the girder 20 and to prevent slippage.

  In addition, the two structural steel members 112 and 113 of the structural steel support member 110 are members that are suspended from the suspension part 111 and attached to the upper ends of the suspension part 111 so that the suspension part 111 is detachable and rotatable. In the vicinity of the lower ends of these two structural steel materials 112 and 113, four holes 1121 and 1131 are provided in parallel vertically. By providing such holes 1121 and 1131, it is possible to select a rigid coupling position of the combined shape steel material 114, and thus it is easy to divert the shape steel support material 110.

  The combined shape steel material 114 of the shape steel support material 110 is a horizontal member that removably rigidly connects the vicinity of the lower ends of the two shape steel materials 112 and 113. The rigid coupling position is adjusted by selecting the holes 1121 and 1131 provided in the vicinity of the lower ends of the structural steel materials 112 and 113, respectively, and fixing them with bolts and nuts. In addition, a guide 1141 having an L-shaped cross-sectional shape for positioning and supporting a receiving member (for example, a square member such as a 2 inch square) 142 that receives the lower end of the simple jack 120 is provided on the upper surface of the coupled steel member 114. ing.

  Further, the simple jack 120 is mounted on the bottom surface 212 of the lower flange 21 and is mounted on the lower surface 212 of the lower flange 21, which is mounted on the receiving material 142 that is positioned and supported on the combined steel material 114 of each of the plurality of structural steel support members 110. It is a jack that supports the frame 40 and fixes the shaped steel support member 110 to the girder 20. As the simple jack 120, for example, a simple jack composed of a hawk nut 121 and a long bolt 122 can be used.

  The construction sequence of the support 100 for the cathodic protection shown in FIG. 1 is as follows.

  FIG. 2 is an explanatory diagram for explaining the construction of the support 100 for the anticorrosion work. 3 and 4 are enlarged cross-sectional views of the long groove in which the anode for the cathodic protection is embedded, and FIG. 5 is an enlarged cross-sectional view of the long groove with the surface sealed.

  First, as shown in FIG. 2, long grooves 51 and 52 are cut at the anode installation position of the reinforced concrete girder 20 using a cutter (not shown) when constructing the cathodic protection support 100. The long grooves 51 and 52 have a depth obtained by adding, for example, about 5 mm to the width of the strip-shaped anode. It should be noted that the anode installation position at which the concrete cover was found to be sufficient in the prior survey for the cathodic protection work, for example, the upper surface 211 and the lower surface 212 of the lower flange 21 of the girder 20 and the hunch portion 221 of the upper flange 22 As shown in FIG. 3, the long groove 51 to be cut is cut at an angle of, for example, 90 degrees with respect to the surface of the beam 20 at the anode installation position. In addition, in the anode installation position where the concrete cover is considered to be small in the preliminary investigation in the construction of the cathodic protection work, here, for example, the anode installation position located on the side surface 231 of the web 23 of the girder 20 and the side surface 213 of the lower flange 21 4, the long groove 52 to be cut is cut with respect to the surface of the beam 20 at an angle of, for example, 60 degrees.

  Next, the strip-shaped anode 60 is inserted into the long grooves 51 and 52 so that the width direction thereof coincides with the groove depth direction. As shown in FIG. 5, the anode 60 inserted into the long grooves 51 and 52 is fixed in the long groove using, for example, a rubber anode holding member 70.

  When sealing the surfaces of the long grooves 51 and 52, as shown in FIG. 5, for example, a mortar filling form 40 provided with an inlet and an outlet at intervals of about 1 m to 2 m is attached and sealed. The mortar filling form 40 may be any material as long as it does not cause leakage due to pressure or penetration when mortar is injected, such as rubber, wood, resin, or cloth.

  Next, the support 100 for an anticorrosion work is constructed. In the construction of the cathodic protection work 100, first, the suspension part 111, the two shaped steel members 112, 113, and the combined shaped steel material 114 are assembled on the ironworks or the ground using bolts and nuts, and the U-shaped opening is opened. A plurality of structural steel support members 110 having the suspension portion 111 attached to the end so as to be detachable and rotatable and fixed are manufactured. When the two structural steel members 112 and 113 and the combined structural steel member 114 are rigidly connected, holes 1121 and 1131 provided near the lower ends of the respective structural steel members 112 and 113 according to the simple jack 120 and the receiving member 142 to be used. Is selected, and the rigid coupling position of the coupled steel member 114 is adjusted.

  Next, as shown in FIG. 2, the suspension portion 111 that is detachably attached to the open ends of each of the plurality of structural steel support members 110 and that can be pivotally fixed is arranged at intervals of 800 mm in the bridge axis direction of the girder 20. The plurality of structural steel support members 110 are arranged on the spar 20 by being hooked on the upper surface 211 of the lower flange 21 of the spar 20. When placing the suspension part 111, the suspension part 111, which can be rotated and fixed, is rotated and hooked on the upper surface 211 of the lower flange 21 of the girder 20. At this time, the rubber plate 30 affixed to the suspension portion 111 serves to prevent damage to the girder 20 and to prevent slippage.

  Next, by inserting the receiving material 141 into the groove 1111 formed on the upper surface of the suspension portion 111, the receiving material 141 is passed in the bridge axis direction. Further, the receiving material 142 is passed in the bridge axis direction along the guide 1141 provided on the upper surface of the coupled steel member 114.

  Next, with the receiving material 142 passed in the bridge axis direction on the combined steel material 114 as a base, the simple jacks 120 are installed at intervals of about 100 mm, and the mortar filling form 40 installed on the lower surface 212 of the lower flange 21 is provided. While holding down with the simple jack 120, the shape steel support material 110 is fixed to the girder 20 to prevent wobble. Further, the receiving material 141 passed in the bridge axis direction on the suspension part 111 is used as a base, the pier 130 is installed at an interval of about 100 mm, and the mortar filling form 40 installed on the haunch part 221 of the upper flange 22 is used as the pier 130. Hold with.

  After pressing the mortar filling form 40 with the simple jack 120 or the pier 130 as described above, the mortar is press-fitted into the long grooves 51 and 52 with a manual pump, for example, at a pressure of 0.1 Mpa to 0.2 Mpa.

  After mortar hardening, the simple jack 120, the pier 130, and the receiving members 141 and 142 are removed, and the mortar filling form frame 40 and the shaped steel support member 110 to which the suspension part 111 is attached are disassembled in this order.

  Since the first embodiment described above, which is the support 100 for the anticorrosion work, is a support work mainly made of shape steel, it requires less use of wood, and the shape steel support material 110 is manufactured at the ironworks. Therefore, there is no need for on-site processing, durability that allows long-term storage, and easy diversion. In addition, the amount of wood used is smaller than that of the conventional cathodic protection support 900, which is superior in terms of environment and economy, leading to a reduction in the construction period on site, and an economic effect is expected. it can.

  Further, in the support 100 for the cathodic protection work of the first embodiment, the shape steel support material 110 is installed by rotating the suspension part 111 attached to the open end so as to be detachable and rotatable and fixed. Since it is only placed on the upper surface 211 of the lower flange 21, the installation is easy, work is possible even if it is not a worker with special skills, work can be done with a small number of people, installation time is shortened, Excellent in terms of economy and construction period. Moreover, since the groove | channel 1111 and the guide 1141 which position and support the receiving materials 141 and 142 which let it pass in a bridge axis direction are provided, installation of the receiving materials 141 and 142 is easy. In addition, since the support 100 for the anticorrosion work of the first embodiment can surely hold the mortar filling form 40 with the simple jack 120 or the pier 130, the outflow of the mortar during the mortar press-fitting operation is suppressed. . Further, the shape steel support material 110 itself has strength, and the shape steel support material 110 is easily and reliably fixed to the beam 20 by being stretched by the simple jack 120. Further, since the space between the girders 20 is open even after the support 100 for the cathodic protection is installed, the pouring work and the movement of the position are easy.

  In addition, the structural steel support material 110 in the cathodic protection work support 100 of the first embodiment is to disassemble the suspended portion 111, the two structural steel materials 112 and 113, and the combined structural steel material 114 during storage. This saves a small storage space.

  The description of the support for the anticorrosion work 100 according to the first embodiment of the present invention has been completed, and the support for the formwork holding according to the second embodiment of the present invention will be described.

  In the second embodiment described below, a concrete girder is repaired by replacing the suspension portion 111 of the first embodiment described above with a bracket that is a locking member different from the suspension portion 111. This is a support for holding the formwork used for pouring mortar or resin in the case of cracking or missing) or for placing repair concrete.

  Hereinafter, the same elements as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and only differences from the first embodiment described above will be described.

  FIG. 6 is a longitudinal sectional view of the girder 25 on which the formwork holding support 200 according to the second embodiment of the present invention is installed.

  6 includes a bracket 24 attached to the concrete surface 251 on the lower surface side of the girder 25, and a plurality of U-shaped support members 110 having an open U shape suspended from the bracket 24. And. In addition, the entire bracket 24 and the shaped steel support member 110 are rust-proofed, and have high durability.

  The bracket 24 is a locking member attached to the concrete surface 251 on the lower surface side of the concrete girder 25, and is a member formed by reinforcing an L-shaped steel 241 with an oblique material 242, for example.

  The construction sequence of the support 200 for holding the mold shown in FIG. 6 is as follows.

  First, the bracket 24, the two structural steel members 112 and 113, and the combined structural steel member 114 are assembled at the ironworks or the ground using bolts and nuts, and a plurality of structural steel members each having the U-shaped open end and the bracket 24 attached thereto. A support material 110 is manufactured.

  Next, the bracket 24 attached to the open end of each of the plurality of shaped steel support members 110 is bolted to the concrete surface 251 on the lower surface side of the girder 25 within a distance of 800 mm in the bridge axis direction of the girder 25. By attaching, the plurality of shaped steel support members 110 are arranged on the girder 25.

  Next, the receiving material 142 is passed in the direction of the bridge axis along the guide 1141 provided on the upper surface of the coupled steel member 114.

  Next, using the receiving material 142 passed in the bridge axis direction on the combined shape steel material 114, the piers 131 are installed at intervals of about 100 mm, the formwork 41 is pressed by the piers 131, and the shape steel supporting material 110 is used. Is fixed to the girder 25 to prevent wobble. Further, the mold frame 42 is installed using the mold frame 41 as a base, and the installed mold frame 42 is pressed by the crosspiece 132.

  After pressing the molds 41 and 42 with the crosspieces 131 and 132 in this way, the mortar is press-fitted into the repair site with a manual pump, for example, at a pressure of 0.1 to 0.2 Mpa.

  After the mortar hardening, the crosspieces 131 and 132 and the receiving material 142 are removed, and the shaped steel support materials 110 to which the mold frames 41 and 42 and the bracket 24 are attached are disassembled in this order.

  The formwork holding support 200 according to the second embodiment described above can be easily and reliably fixed to the girders even if the girders have no lower flange. Further, such a support 200 for holding a formwork can be widely applied to cross-sectional repair (particularly injection) of marine structure repair (pier) and the like.

It is a longitudinal cross-sectional view of the girder in which the support for an anticorrosion work which is a 1st Example of this invention was installed. It is explanatory drawing explaining construction of the support work for cathodic protection. It is an expanded cross-sectional view of the long groove which embeds the anode for cathodic protection. It is an expanded cross-sectional view of the long groove which embeds the anode for cathodic protection. It is an expansion cross-sectional view of the long groove which sealed the surface. It is a longitudinal cross-sectional view of the girder in which the support for a formwork holding | maintenance which is the 2nd Example of this invention was installed. It is a front view of the girder in which the support for the conventional anticorrosion work of the girder was installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Cathodic protection support body 110 Shape steel support material 111 Suspension part 1111 Groove 112,113 Shape steel material 1121,1131 Hole 114 Bonded steel material 1141 Guide 120 Simple jack 121 Taka nut 122 Long bolt 130,131 Pier 141,142 Receiving material 200 Supports for formwork 20, 25 Girder 21 Lower flange 211 Upper surface 212 Lower surface 213 Side surface 22 Upper flange 221 Hunch part 23 Web 231 Side surface 24 Bracket 241 L-shaped steel 242 Diagonal material 251 Concrete surface 30 Rubber plate 40 Mortar filling mold 41, 42 Formwork 51, 52 Long groove 60 Anode 70 Anode holding member 81, 82 Girder 900 Support for electric corrosion protection 90, 91 Square 92 92 Crosspiece

Claims (5)

  A locking member that locks to the concrete on the underside of the girder, a plurality of upward-opening U-shaped shaped steel support members suspended from the locking member, and the plurality of shaped steel support materials A support for holding a formwork, comprising: a support member that is passed and supports the formwork.   The locking member is a suspension part that is placed on the upper surface of the lower flange of the girder, and the support member supports the formwork and is a support fixing jack that is interposed between the shape steel support material and the girder. The support for holding a formwork according to claim 1, wherein   The suspension part is detachably or pivotally attached to the open end of the U-shaped shaped steel support material, and the structural steel support material is two shaped steel materials depending from the suspension part. 3. A support for holding a formwork according to claim 2, characterized in that it comprises a horizontal joint-type steel material in which the vicinity of the lower ends of the two shape steel materials are detachably rigidly connected.   4. A formwork holder according to claim 2 or 3, wherein a support part for receiving material for receiving a lower end of a pier that supports a formwork installed on a haunch part of an upper flange of a girder is provided on an upper surface of the suspension part. Support work.   2. The support for holding a formwork according to claim 1, wherein the locking member is a bracket attached to a concrete surface on a lower surface side of a girder.

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