JP2011157778A - Form structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form structure which minimizes jetting of concrete to reduce works to a minimum for smoothly finishing the top surface of a column base foundation part at a low level portion. <P>SOLUTION: The form structure A includes a lid member 10 for covering the top surface of the column base foundation part 5 as the low level portion. The lid member 10 is formed with an insertion hole 101 formed in response to an anchor bolt 1, and includes a nut 22 and a washer 20, as a retaining means, which are configured to allow the lid member 10 to be stopped to respective predetermined positions of the plurality of anchor bolts 1 and also to detach the lid member 10 from the anchor bolts 1 after placing concrete. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a formwork structure used when building a reinforced concrete structure in which concrete is continuously and integrally cast in a high-order part and a low-order part.

  In concrete foundations of steel structure buildings using steel columns such as steel pipes, the column bases with embedded anchor bolts are arranged corresponding to the installation positions of the columns. In general, the base beam part connected to the part is integrally formed.

  In particular, in a frame having a rigid frame structure, dimensions of columns and column bases (base plates having anchor bolt insertion holes for fixing the columns) are increased. When building a building by attaching a floor slab or outer wall slab made of concrete panel such as ALC panel or PC panel to such a frame, if the top level of the column base is equal to the base beam, It is necessary to make the notches formed at the corners of the panel arranged in contact with the portion larger in accordance with the dimensions of the column base, which may hinder the support of the panel.

  For this reason, the top level of the column base is set lower than the top level of the foundation beam, and the column base is positioned below the floor slab installation level, so that the corner of the panel is It has been attempted to avoid an increase in the notch size.

  When constructing the concrete foundation as described above, the formwork is placed according to the prescribed placement of the column base and foundation beam, and concrete is placed in the space surrounded by this formwork to The column base and the base beam are integrally configured at the same top level as the top level. After that, the installation level is adjusted to fix the column to the column base.

  In the construction method described above, concrete is first placed according to the top end level of the column base, and after the concrete hardens to some extent and the fluidity decreases, the foundation beam portion is set to the predetermined top end level. It is necessary to cast concrete again. For this reason, the problem that the time concerning concrete placement work becomes long occurs.

  Then, the thing of the following patent document 1 is proposed as a construction method of the concrete foundation which can integrally comprise the column base part and foundation beam part from which a top end level differs by once concrete placement. .

Japanese Patent Laid-Open No. 9-59998

  In the above-described conventional technique, a formwork and anchor bolts are arranged, and then concrete is placed in the formwork to integrally form the column base portion and the foundation beam portion. Specifically, it has a side wall forming part that forms a side wall of a concrete foundation having a part corresponding to the column base and a part corresponding to the foundation beam part, and corresponds to the longitudinal end of the foundation beam part. And a mold having a partition plate extending from the upper end of the portion corresponding to the foundation beam portion in the side wall forming portion to the upper end of the portion corresponding to the column base, and a predetermined column base Place the anchor bolt at the position. Next, concrete is cast from above the formwork other than the part corresponding to the column base of the formwork, and the column base of the top end level is lower than the foundation beam divided by the foundation beam and the partition plate. The part is integrally formed.

  In this construction method, when concrete is placed from above the formwork corresponding to the foundation beam portion, the placed concrete flows according to the formwork and is filled in the column base portion and the foundation beam portion. When the cast concrete reaches the top end level of the column base, the concrete is prevented from flowing toward the column base by the partition plate, and only the foundation beam is filled. Therefore, it is an excellent construction method capable of integrally constructing the column base portion and the foundation beam portion having different top end levels by a single concrete placement.

  By the way, in this construction method, when placing concrete having a relatively small slump and low fluidity, the process can usually proceed without any additional work. On the other hand, when placing concrete with a relatively large slump and high fluidity, due to the momentum of the concrete and the vibration of the vibrator, etc., from the top edge of the column base at the lower position (above the formwork of the column base) Concrete may erupt from the opening. In such a case, it was necessary to scrape the ejected concrete or to finish the top end surface smoothly.

  The present invention has been made in view of such a problem, and its purpose is to reduce the ejection of concrete as much as possible even in the case of placing concrete having a relatively large slump and high fluidity. An object of the present invention is to provide a formwork structure that can reduce the work of finishing the top end surface of the column base in a smooth manner as much as possible.

  In order to solve the above-mentioned problem, a formwork structure according to the present invention has a high level portion and a low level portion having different top end levels, and a plurality of anchor bolts project from the low level portion, and the high level portion and the low level portion A formwork structure used when constructing a reinforced concrete structure in which concrete is continuously and integrally cast in a low-level part, and a low-level dam plate material for partitioning a side surface of the low-level part, and the high-level part A high level dam plate material for partitioning the side surface of the low level dam plate material, and a boundary between the low level part and the high level part, from the upper end of the low level dam plate material to the upper end of the high level dam plate material, A boundary weir plate material for partitioning a part of the end portion, and a lid material for covering the top end surface of the lower portion, and the lid material is inserted corresponding to the plurality of anchor bolts A plurality of holes are formed; A holding means configured to be able to make the lid member stationary with respect to a predetermined position of each anchor bolt and to be able to detach the lid member from the anchor bolt after placing concrete. It is characterized by providing.

  The formwork structure according to the present invention is arranged at the boundary between the low level dam plate material for partitioning the side surface of the low level part, the high level dam plate material for partitioning the side surface of the high level part, and the low level part and the high level part. And a boundary dam plate material for partitioning a part of the end portion of the high level portion from the upper end of the low level dam plate material to the upper end of the high level dam plate material. By configuring in this way, concrete is cast from above the formwork other than the lower part corresponding to the column base of the formwork, and the high part and the lower part corresponding to the foundation beam part partitioned by the high level dam plate material. Concrete can be poured into both parts. Since the boundary dam plate material is arranged at the boundary between the low dam plate material and the high dam plate material, after the concrete is filled in the low level part, only the high level part is filled with concrete, and a column base is formed. The part and the foundation beam part can be formed integrally. Furthermore, in the present invention, a lid member for covering the top end surface of the lower part is provided, and holding means capable of making the lid member stationary with respect to a predetermined position of each of the plurality of anchor bolts. The lid material has insertion holes that are provided corresponding to the plurality of anchor bolts. By inserting a plurality of anchor bolts into the insertion holes, the lid member is arranged to cover the top end surface of the lower portion. can do. Further, the holding means is configured to be able to make the lid member stationary with respect to a predetermined position of each of the plurality of anchor bolts, and to be able to remove the lid member from the anchor bolt after the concrete is placed. ing. Therefore, it is possible to prevent the concrete from overflowing from the top end surface of the lower part when placing the concrete, and after the concrete is placed, it is removed by removing the lid material and the column base formed in the lower part. The column end can be arranged by exposing the top end face of the part. As described above, when the formwork structure according to the present invention is used, even when a concrete having a relatively large slump and high fluidity is placed, the concrete jetting when the vibrator is applied is reduced as much as possible. The work of finishing the top end surface of the column base at a smooth finish can be reduced as much as possible.

  In the formwork structure according to the present invention, at least a part of the holding means is made of a hard magnetic material, the lid member is made of a soft magnetic material, and the holding means and the lid member are attached and detached by a magnetic force. It is also preferable that they are connected freely.

  In this preferred embodiment, at least a part of the holding means is made of a hard magnetic material (a material such as an alnico magnet, a ferrite magnet, a samarium cobalt magnet, a neodymium magnet, KS steel, or MK steel) or a material containing a hard magnetic material as a permanent magnet. The lid member is made of a soft magnetic material such as iron or a material containing a soft magnetic material and functions as a material attracted to the permanent magnet. Therefore, since the holding means and the lid material are detachably connected by magnetic force, the lid material can be positioned on the top end surface of the lower part by connecting the holding means and the lid material when placing concrete. After the concrete is placed, the cover member can be detached by pulling the holding means and the cover member apart. In this case, since the lid member and the holding means are detachably connected by magnetic force, they can be easily detached and reused as long as the magnetic force continues.

  In the formwork structure according to the present invention, it is also preferable that at least a part of the holding means includes a screwing portion that can be screwed into the anchor bolt.

  In this preferable aspect, since it is configured to include a screwed portion such as a nut that can be screwed to the anchor bolt as a part of the holding means, the anchor bolt is rotated by rotating the screwed portion screwed to the anchor bolt. It is possible to easily and accurately adjust the position of the holding means relative to. Since the position of the lid member also varies in conjunction with the holding means, the position of the lid member can be easily and accurately adjusted.

  In the formwork structure according to the present invention, it is also preferable that an opening that is not inserted through the anchor bolt is formed in the lid member in a region where the insertion hole is formed.

  In this preferred embodiment, the concrete that has not been solidified can be taken out through the opening while suppressing a large amount of concrete from overflowing, so that the part from which the concrete is taken out is used to partially support the column base. A support member can be disposed. Since it is sufficient that the opening has a necessary and sufficient area for arranging the supporting member, it is possible to easily secure a space for arranging the supporting member while minimizing the overflow of the concrete from the opening. .

  According to the present invention, even when placing concrete with a relatively large slump and high fluidity, the work of reducing the concrete squirting as much as possible and finishing the top end surface of the column base at the lower part smoothly. A formwork structure that can be reduced as much as possible can be provided.

It is a perspective view explaining the structure of the formwork at the time of implementing the construction method which concerns on this embodiment. It is a perspective view which shows the state after placing concrete in a formwork. It is sectional drawing of the column base for demonstrating the method to arrange | position a supporting member to a column base. It is sectional drawing of the column base for demonstrating the method to arrange | position a supporting member to a column base.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  The formwork structure which is embodiment of this invention is demonstrated according to explaining the construction method of the concrete foundation which uses the formwork structure. FIG. 1 is a perspective view illustrating a configuration of a formwork structure according to the present embodiment, and FIG. 2 is a perspective view illustrating a state after concrete is placed on the formwork structure according to the present embodiment.

  In the concrete foundation construction method using the formwork structure according to the present embodiment, the column base and the base beam part having different top end levels are formed by once placing the concrete on the formwork arranged according to the foundation plan. Therefore, it is possible to rationalize the foundation work and shorten the construction period.

  Hereinafter, in order to avoid complication of explanation, the construction method will be described while explaining the configuration of the formwork of the joint portion between the column base and the base beam at the protruding corner shown in FIG. However, the T-shaped coupling portion having the column base and the cross-shaped coupling portion are substantially the same.

  In the foundation construction, in accordance with the basic plan, the way of laying, root cutting, and groundwork are performed in advance by a normal method, and then the foundation footing or the reinforcement of the slab / pressure board and the reinforcement of the foundation muscle are performed.

  After performing the predetermined bar arrangement as described above, the arrangement of the formwork structure A and the arrangement of the four anchor bolts 1 with respect to the formation position of the column base portion 5 are performed. The anchor bolts 1 are arranged diagonally in the column base 5 and are arranged at symmetrical positions with respect to the center of the column base 5 so as to keep them at regular intervals. The anchor bolt 1 is fixed by an anchor frame whose lower end is fixed to the ground surface (the upper surface of the throwing away container). Moreover, the anchor bolt 1 is arrange | positioned at the corner inside a hook-shaped reinforcement (hoop). Which of the mold structure A and the anchor bolt 1 is arranged first is not particularly limited, and may be set as appropriate according to the work environment and work procedure.

  The formwork structure A includes a side wall forming portion 2 (a low level dam plate material and a high level dam plate material) that forms a side wall of a concrete foundation including a foundation beam portion 4 and a column base 5 and end portions in the longitudinal direction of the foundation beam portion 4 And a partition plate 3 (boundary weir plate material) having a predetermined depth from the upper end of the side wall forming portion 2.

  When the foundation beam part 4 and the column base part 5 have the same width dimension, the side wall formation part 2 is comprised by the flat frame 2a formed with unit length. However, in the case of the present embodiment in which the column base 5 has a larger width dimension than the foundation beam 4, the side wall forming unit 2 includes the flat frame 2a (higher dam plate material), the foundation beam 4 and the column base. It is configured by combining deformed frames 2b and 2c (low level dam plate materials) selected according to the connection structure with the part 5.

  As shown in FIG. 1, when the column base 5 forms a corner and the width of the foundation beam 4 is smaller than the width of the column base 5, it corresponds to the position of the foundation beam 4. A plurality of flat frame frames 2a are arranged to face each other, adjacent flat plate frames 2a are connected to each other to form a part of the side wall forming portion 2, and selected in advance according to the configuration position of the column base 5 The deformed frames 2b and 2c are arranged according to the shape, and are connected to the adjacent deformed frames 2b and 2c and to the flat frame 2a.

  The heights of the deformed frames 2b and 2c are formed to be lower than the height of the flat frame 2a. That is, when providing a jig for assuring the dimensional accuracy of the anchor bolt 1 arranged on the column base 5 or constituting means for preventing the anchor bolt 1 from falling, It is preferable that the height of the odd-shaped frames 2b and 2c is made lower than that of the flat frame 2a in accordance with a dimension set in advance according to the means.

  The partition plate 3 is disposed at the end in the longitudinal direction of the foundation beam part 4, that is, at the boundary between the foundation beam part 4 and the column base part 5. The partition plate 3 includes a partition member 3a having a depth set in advance corresponding to a difference between the top end levels of the foundation beam portion 4 and the column base portion 5, and welding or the like to one end portion of the partition member 3a. And a side plate 3c provided so as to extend from both ends of the partition member 3a.

  The partition plate 3 is disposed at a predetermined position serving as a boundary between the foundation beam portion 4 and the column base portion 5, and is fixed to a flange formed on the flat frame 2a by a vise fixing bracket 6.

  In the case of this embodiment, the cover material 10 is provided so that the column base part 5 can be covered. The cover member 10 has four insertion holes 101 corresponding to the four anchor bolts 1. An opening 102 is formed at substantially the center of the lid member 10 so as to be located in the region where the four insertion holes 101 of the lid member 10 are formed. The opening 102 is an opening through which the anchor bolt 1 is not inserted, and is provided for providing a space for arranging a support member (not shown in FIGS. 1 and 2) described later. The lid member 10 corresponds to the planar shape of the column base 5 and is configured not to interfere with the deformed frames 2b and 2c and the partition plate 3. Therefore, the lid member 10 can be used universally regardless of the number of connections of the foundation beam portions 4. In other words, the lid member 10 can be used for general purposes regardless of the arrangement mode of the deformed frames 2b and 2c and the partition plate 3 and the presence or absence of the arrangement.

  The lid member 10 is provided with a pair of holding portions 103 having annular projections. With the holding portion 103, the anchor bolt 1 is inserted into each of the four insertion holes 101 of the lid member 10. Further, a washer 20 is passed through each of the anchor bolts 1, and a nut 22 (screw part) is further screwed from above. In the present embodiment, the washer 20 is a permanent magnet formed of a hard magnetic material, and the nut 22 is formed of iron (preferably a steel material containing iron) that is a soft magnetic material. Therefore, when the lid member 10 and the washer 20 are brought close to each other, they are magnetized, and when the washer 20 magnetized to the lid member 10 is brought closer, the nut 22 and the washer 20 are magnetized. By doing so, the lid member 10 can be held by the nut 22 and the washer 20. Furthermore, by adjusting the screwing amount of the nut while maintaining the state in which the lid member 10 is held, the lid member 10 can be stopped at a predetermined position corresponding to the upper ends of the deformed frames 2b and 2c. In addition, even if it is accidentally dropped during the placement of the lid member 10, it is received by a hoop line surrounding the anchor bolt 1. The anchor bolt 1 may be inserted after the washer 20 is magnetically attached to the insertion hole 101 of the lid member 10 in advance.

  As described above, the formwork structure A is arranged according to the arrangement of the concrete foundation shown in the foundation plan, and the anchor bolt 1 is arranged at the position where the column base part 5 is formed, and then corresponds to the foundation beam part 4. When concrete is placed only from above the formwork structure A, the placed concrete flows along the formwork structure A and fills the foundation beam part 4 and the column base part 5.

  When the concrete filling level for the formwork structure A rises and reaches the top end level of the column base 5, when the concrete is continuously placed, the foundation base 4 to the column base is placed. The flow to the part 5 is blocked by the partition plate 3 and only the foundation beam part 4 is filled. Then, when the concrete filling level reaches the top end level of the foundation beam portion 4, by stopping the concrete placement on the formwork structure A, the foundation beam portion 4 and the column base portion 5 having different top end levels are placed. It is possible to configure at the same time.

  As described above, concrete is cast into the formwork structure A to form the foundation beam part 4 and the column base part 5 having different top end levels. After a predetermined curing period, the formwork structure A is removed. To expose the concrete foundation. When removing the lid member 10, the nut 22 is removed, and the lid member 10 is pulled up and removed.

  Thereafter, a support member (not explicitly shown in FIGS. 1 and 2) is disposed at the top end of the column base 5. Next, a steel plate base plate (not shown in the figure) is fixed to the anchor bolt 1, and concrete or mortar is filled with the anchor base bolt 5 so as to match the top end level of the foundation beam portion 4 with respect to the column base 5. The column base part of the steel pillar which consists of 1 and a base plate is embed | buried.

  Next, a method for arranging the support member on the column base 5 will be described with reference to FIGS. 3 and 4. FIGS. 3 and 4 are cross-sectional views of the column base 5 for explaining a method of arranging the support member 35 on the column base 5.

  As shown in FIG. 3, when concrete is placed on the formwork structure A described with reference to FIGS. 1 and 2, the concrete protrudes from the opening 102 of the lid member 10 and corresponds to the column base 5. The part to be filled is filled with concrete.

  As shown in FIG. 4, after the concrete is cast, uncured concrete at the center of the column base 5 is removed to form a recess 51, and a support member 35 is embedded in the recess 51, and the concrete in the recess 51 is also embedded. A bowl-shaped cover member 511 is disposed to prevent the inflow. The cover member 511 is removed together with the material constituting the other formwork structure A after the concrete is hardened. The support member 35 includes a screw support 30, a lock nut 31, and a base portion 32. The screw support 30 is screwed to the base portion 32, and is configured to be able to advance and retreat relative to the base portion 32 by rotating. The base portion 32 includes a bottom plate 32 a and a cylindrical dam plate 32 b so that the screw support 30 and the lock nut 31 are not buried in the concrete, and is embedded in the bottom of the concave portion 51 of the column base portion 5. ing. The screw support 30 mounts a steel pillar base plate to level the steel pillar. Therefore, after the concrete is hardened, the upper end of the screw support 30 is adjusted to a predetermined position and fixed with the lock nut 31, and then the steel column is placed.

  As described above, the formwork structure A according to the present embodiment includes the foundation beam portion 4 that is the high-order portion and the column base portion 5 that is the low-order portion, and the column base foundation that is the low-order portion. Four anchor bolts 1 project from the part 5 and are used when constructing a reinforced concrete structure in which concrete is continuously and integrally cast at the foundation beam part 4 and the column base part 5 It is. As a specific configuration, deformed frames 2b and 2c as low dam plate members for partitioning the side surface of the column base 5 which is the lower portion, and a high dam for partitioning the side surface of the foundation beam portion 4 which is the higher portion. The flat plate frame 2a as a plate material is arranged at the boundary between the foundation beam portion 4 and the column base 5 and extends from the upper ends of the deformed frames 2b and 2c to the upper end of the flat frame frame 2a. A partition plate 3 serving as a boundary dam plate material for partitioning a part of the end portion of the column base and a lid member 10 for covering the top end surface of the column base portion 5 are provided. The cover member 10 is formed with four insertion holes 101 provided corresponding to the four anchor bolts 1.

  In the present embodiment, the lid member 10 can be stopped at a predetermined position of each of the four anchor bolts 1. After the concrete is placed, the lid member 10 can be detached from the anchor bolt 1. Holding means configured to be possible are provided. In the case of this embodiment, the holding means can detachably attach the nut 22 as a positioning member that can be stopped at a predetermined position of each anchor bolt 1 inserted through the insertion hole 101 of the lid member 10, and the nut 22 and the lid member 10. And a washer 20 as a connecting member. The washer 20 as a connecting member is made of a hard magnetic material (alnico magnet, ferrite magnet, samarium cobalt magnet, neodymium magnet, KS steel, MK steel, etc.), and the lid member 10 and the nut 22 as a positioning member are made of iron or the like. The washer 20 and the lid member 10 and the washer 20 and the nut 22 are detachably connected to each other by magnetic force.

  In this embodiment, in this way, the holding means is constituted by the nut 22 as the positioning member (screwing portion) and the washer 20 as the connecting member, so that the lid member 10 is placed at a predetermined position of the anchor bolt 1. While the nut 22 that is a positioning member has a function of making it stand still, the function that removably connects the nut 22 as the positioning member and the lid member 10 is made to be attached to the washer 20 as the connecting member. Each member can be formed with a material and a shape optimal for the above. Further, since the washer 20 that is a connecting member is made of a hard magnetic material, and the lid member 10 and the nut 22 that is a positioning member are made of a soft magnetic material, the connecting member is made of a hard magnetic material that is a relatively expensive material. Only the washer 20 is formed, and the above-described effects can be achieved without wasting costs as a whole of the mold structure A.

  Furthermore, in this embodiment, since the nut 22 that can be screwed onto the anchor bolt 1 is used as a positioning member formed of a soft magnetic material, a nut as a general-purpose member made of iron or the like can be used. Further, since the washer 20 that can be inserted into the anchor bolt 1 is used as the connecting member formed of a hard magnetic material, a simple structure of a flat plate ring may be formed by using a hard magnetic material that is a relatively expensive material. The effects described above can be achieved without incurring unnecessary costs.

  The connecting member may not be an annular member such as a washer. For example, a semicircular ring shape or a U (U) shape may be used. With this configuration, the anchor bolt can be attached and detached from the lateral direction. In addition, a simpler shape may be used as long as the connecting function is not impaired by lateral movement or falling.

  As described above, in this embodiment, the washer 20 which is at least a part of the holding means including the nut 22 and the washer 20 is made of a hard magnetic material (alnico magnet, ferrite magnet, samarium cobalt magnet, neodymium magnet, KS steel, MK steel, or the like). The lid member 10 is made of a soft magnetic material such as iron (it is also preferable to use a steel material containing a soft magnetic material) and is configured to function as being attracted to the permanent magnet. Yes. Accordingly, since the holding means and the lid member 10 are detachably connected by magnetic force, the column base base portion 5 having the lid member 10 as a low-order portion can be obtained by connecting the holding means and the lid member 10 when placing concrete. The lid 10 can be detached by pulling the holding means away from the lid 10 after placing the concrete. In this case, since the lid member 10 and the holding means are detachably connected by magnetic force, they can be easily detached and reused as long as the magnetic force continues.

  In view of the gist of the present invention, it is also preferable to employ a configuration in which the nut 22 is made of a hard magnetic material and the washer 20 is omitted. Thus, if all the holding means are made of a hard magnetic material and function as a permanent magnet, the holding means can be constituted by only the nut 22 without the washer 20, and the number of parts can be reduced.

  Further, in view of the gist of the present invention, the holding means can make the lid member 10 stationary with respect to a predetermined position of each of the four anchor bolts 1, and the lid from the anchor bolt 1 after the concrete is placed. Since it is sufficient if it is configured so that the material 10 can be detached, a configuration that does not use magnetic force can also be employed. For example, it is also a preferable aspect that a projection that can support the lid member 10 is provided at a predetermined position of the anchor bolt 1 and the lid member 10 is engaged and held by this projection. In addition, a latching piece (hook) that can be freely moved (slided) may be provided on the lid member 10, and the latching piece may be latched on the upper end surface of the nut 22. Moreover, it is also a preferable aspect that the adhesive material is applied to both surfaces of the washer and the nut 22 and the lid material 10 are connected by the adhesive force of the adhesive material. In this case, when the lid member 10 is reused, it is preferable to re-apply the adhesive material. It is also preferable to attach an adhesive member such as a double-sided tape to both sides of the washer.

  As described above, the formwork structure A according to the present embodiment is such that concrete is placed from above the formwork other than the lower part corresponding to the column base part 5, and the high part and the column base corresponding to the foundation beam part 4 are placed. Concrete can be poured into both the lower part corresponding to the foundation part 5. Since the partition plate 3 is arranged at the boundary between the high part corresponding to the foundation beam part 4 and the low part corresponding to the column base part 5, the foundation beam is filled after the pillar base part 5 is filled with concrete. The column base portion 5 and the foundation beam portion 4 in which only the portion 4 is filled with concrete and a step is formed can be integrally formed.

  Furthermore, in the present embodiment, a lid member 10 for covering the top end surface of the column base 5 and a holding means capable of making the lid member 10 stationary with respect to predetermined positions of the four anchor bolts 1 are provided. I have. The lid member 10 is formed with insertion holes 101 provided corresponding to the four anchor bolts 1. By inserting the four anchor bolts 1 into the insertion holes 101, the column base It can arrange | position so that the top end surface of the part 5 may be covered. Further, the holding means can make the lid member 10 stationary with respect to a predetermined position of each of the four anchor bolts, and can remove the lid member 10 from the anchor bolt 1 after placing concrete. It is configured as follows. Therefore, it is possible to prevent the concrete from overflowing from the top end surface of the column base portion 5 when the concrete is placed. After the concrete is placed, the concrete is removed by removing the lid member 10 and formed in the lower portion. The column base can be arranged by exposing the top end surface of the column base 5. Thus, if the formwork structure A according to the present embodiment is used, even when concrete having a relatively large slump and high fluidity is placed, the concrete ejection when the vibrator is applied is reduced as much as possible. It is possible to reduce as much as possible the work of finishing the top end surface of the column base 5 at the lower part as smooth as possible.

  In the formwork structure A according to the present embodiment, the lid member 10 has an opening 102 that is not inserted into the anchor bolt 1 in the region where the insertion hole 101 is formed. By configuring in this way, it is possible to take out the concrete that has not been solidified through the opening 102 while suppressing a large amount of concrete from overflowing. Therefore, the column base is partially attached to the part from which the concrete has been taken out. A support member 35 for supporting can be arranged. Since it is sufficient that the opening 102 has a necessary and sufficient width for arranging the support member 35, a space for arranging the support member 35 can be easily secured while minimizing the overflow of the concrete from the opening 102. can do.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1: Anchor bolt 2: Side wall forming portion 2a: Flat frame 2b, 2c: Modified frame 3: Partition plate 3a: Partition material 3b: Locking material 3c: Side plate 4: Foundation beam portion 5: Column base portion 6: Fixing bracket 10: Lid 20: Washer 22: Nut 35: Support member 101: Insertion hole 102: Opening 103: Holding part A: Formwork structure

Claims (4)

It has a high level part and a low level part with different top end levels, and a plurality of anchor bolts project from the low level part, and concrete is continuously and integrally driven at the high level part and the low level part. A formwork structure used when constructing a reinforced concrete structure,
A lower weir plate material for partitioning the side surface of the lower portion;
A high level weir plate material for partitioning the side surface of the high level part;
Boundary dam plate material that is arranged at the boundary between the lower portion and the higher portion, and that divides a part of the end portion of the high portion from the upper end of the lower dam plate material to the upper end of the high dam plate member When,
A lid for covering the top end surface of the lower part, and
The lid member is formed with an insertion hole provided corresponding to the plurality of anchor bolts,
The lid member can be stationary with respect to a predetermined position of each of the plurality of anchor bolts, and the lid member can be detached from the anchor bolt after placing concrete. A formwork structure comprising a holding means.   At least a part of the holding means is made of a hard magnetic material, the lid member is made of a soft magnetic material, and the holding means and the lid member are detachably connected by magnetic force. Item 2. A form structure according to Item 1.   The formwork structure according to claim 1 or 2, wherein at least a part of the holding means includes a screwing portion that can be screwed into the anchor bolt.   The mold according to any one of claims 1 to 3, wherein an opening that is not inserted through the anchor bolt is formed in the lid member in a region where the insertion hole is formed. Frame structure.

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