JP5957354B2 - RC simple underground wall construction form for frost heave measures and RC simple underground wall construction method for frost heave measures - Google Patents

Description

  The present invention relates to an RC (steel reinforced) simple underground wall construction embedded form for frost heave countermeasures and a method of constructing an RC simple underground wall for frost heave countermeasures using the form, for example, in the winter of a cold region As a countermeasure against frost heave, it is applied to the case where the underground wall is built around the building at the base of the building.

  Buildings that require a relatively large space, such as factories, warehouses, hangars, etc., are generally constructed with steel structures, and the RC structure independent footings that support the buildings by installing them in independent shapes for each pillar on the foundation of the building. A foundation is used, and an underground beam (foundation beam) is generally arranged between each foundation.

  In addition, the outer wall of the building is constructed by bridging the horizontal torso edge between each pillar and attaching exterior materials on it. Especially, from the ground surface to a certain height (for example, under the window) is called the waist wall. It is constituted by dirt and scratches, and also exterior materials having different materials and colors from the viewpoint of design, and no underground wall or the like is provided below the ground surface of the waist wall.

  For this reason, especially in cold regions, the building may be pushed up together with the foundations due to the “freezing phenomenon” in which the surface layer of the ground freezes and rises in the winter, and may cause damage due to frost heaving, such as peeling or breaking the waist wall. was there.

  In addition, the frost heaving phenomenon may occur even in the ground below the first floor. For this reason, when the first floor is used as a dirt floor, the frost heave may be damaged.

  For this reason, as a general countermeasure against frost heaving in the winter in cold regions, the foundation and the bottom of the underground beam are installed at a position deeper than the freezing depth, and the ground beam extends from the upper end of the underground beam to the lower end of the waist wall. The middle wall is set up, and heat insulation is installed inside.

  Moreover, for example, in Patent Document 1, as a method of constructing a frost heave inland underground continuous wall, a steel box-type sheet pile with a heat insulating material provided on the outer surface is manufactured, and the sheet pile is excavated and formed in the ground. A method is described in which a shell body is formed by building an outer surface provided with the heat insulating material so as to face at least a frozen soil portion of a groove, and concrete is placed in the shell body and hardened.

  In Patent Document 2, the foundation beam is supported from below by a foundation bottom installed at a position deeper than the freezing depth, and a frost heave absorbing member that is vertically stretchable is installed between the foundation beam and the ground. The frost heave prevention structure of the constructed foundation is described.

Japanese Patent Laid-Open No. 07-305338 JP 07-158101 A

  However, in the above-mentioned general frost heave countermeasure method, when assembling the mold, it is necessary to assemble while supporting many molds so that they are self-supporting with many supporting materials made of steel pipes, squares, etc. Since there are line work and formwork dismantling and removal work, it is necessary to arrange skilled workers, and the field work is complicated and the construction period is unavoidable.

  In addition, if both the foundation and underground beam are installed at a position deeper than the freezing depth, the cross-section of the underground beam is particularly large, which increases the amount of concrete and reinforcing bars used, and the amount of excavated soil. Since it was discharged in large quantities, there were problems such as increased material costs and disposal costs for excavated soil.

  In addition, heat insulation for frost heave protection is generally attached to the inside of the foundation beam (inner heat insulation structure), so the so-called “heat bridge” is likely to occur and the heat insulation effect is not sufficient. It was.

  On the other hand, in the method using the steel box-type sheet pile of the cited document 1, the production of the steel box-type sheet pile is not only troublesome in shape and costly, but also in the production stage of the steel box-type sheet pile, Thickness, shape, etc. were decided, and there was a problem that it was not possible to change locally.

  The present invention has been made to solve the above problems, and in particular, it eliminates the need for specialized occupations such as formwork and facilitates on-site work, thereby significantly reducing costs and shortening the construction period compared to general construction methods. It is an object of the present invention to provide a method of constructing an RC simple underground wall for frost heave countermeasures and an RC simple underground wall for frost heave countermeasures.

The embedded formwork for RC simple underground wall construction for anti-frost heave of the present invention is placed on the RC foundation construction form between the RC foundation construction forms installed at intervals on the excavation ground surface deeper than the freezing depth. a continuous heaving countermeasure RC simple diaphragm wall construction for buried formwork to be installed, a plurality of the steel pillars erected at intervals on the excavating ground surface of the freezing depth deeper, manufactured by the steel The steel is composed of a plurality of steel molds installed opposite to each other in one section of the steel struts on the excavated ground surface between the struts , and both ends fastened to the steel struts. The steel column is composed of a column main body made of H-shaped steel and a base plate attached to the lower end of the column main body, and the steel mold is made of a thin steel plate and a plurality of steels attached to the outer surface of the thin steel plate. is composed of a reinforcing rib member, both end portions of the steel formwork it to the inside of the flange of the steel post Is characterized in that the heat insulating material is attached to the inner surface of the installed steel mold respectively attached stopped and the frozen ground side.

Moreover, the RC simple underground wall construction method for frost heave countermeasures according to the present invention is the RC simple ground for frost heave countermeasures by the embedded form for RC simple underground wall construction for frost heave countermeasures according to any one of claims 1 to 3. In the middle wall construction method, the process of digging the ground to deeper than the freezing depth , the process of installing the RC foundation construction form on the excavated ground surface at intervals, the excavation ground surface between the RC foundation construction forms erecting steel struts constant intervals in the above process, together not face to the steel formwork on excavating ground surface between the steel strut, and frozen ground side steel mold having a heat insulating material A step of fixing the both ends of the steel mold frame to the inner side of the flange of each steel column, and the embedded formwork for building the RC foundation and the RC simple underground wall And a step of placing concrete in the interior.

  The present invention relates to the shape and dimensions of each member such as a steel support and a steel formwork, and a method for fixing the steel support on the excavation ground surface and a method for fixing the steel formwork to the steel support. By unifying the system, it is possible to easily assemble the formwork in the field without relying on skilled craftsmen such as formwork and rebar workers, and eliminate the work of removing the formwork at all. This makes it possible to save labor, shorten the construction period, and reduce costs.

  According to the present invention, the H-shaped steel is used for the column main body of the steel column, the flange of the H-shaped steel is used as a joint for fixing the end of the steel mold to the steel column, A base plate is attached to the lower end of the steel to form a self-supporting column, and the base plate is fixed on the excavated ground surface by an anchor member such as a hole-in anchor. By attaching steel reinforcing ribs to the system, the shape and structure of each member can be unified and systematized, which makes it possible to assemble on-site formwork such as formwork and rebar This can be done without relying on the skilled craftsman, and there is no work to remove the formwork, saving labor on site work, shortening the construction period, and further reducing costs. Also, all these members can be manufactured easily and at low cost because they can be produced in the factory.

  In addition, the height adjustment bolt can be attached to the base plate to easily adjust the inclination and height of the column main body. Furthermore, by attaching a heat insulating material to the inner side surface of one thin steel plate of the opposing steel formwork and installing the steel formwork on the frozen ground side to make an RC underground wall with an outer heat insulating structure, a heat bridge (Heat bridge) can be prevented and the heat insulation performance can be improved.

  According to the present invention, by assembling as many members as possible, such as steel columns and steel molds, into a system, assembly of the formwork in the field can be performed by skilled craftsmen such as formworkers and rebar workers. This can be done without any reliance, and there is no work to remove the formwork, saving labor on site, shortening the construction period, and further reducing costs. Also, all these members can be manufactured easily and at low cost because they can be produced in the factory.

  Furthermore, by using the RC underground wall of the outer heat insulating structure, it is possible to prevent heat bridges and improve the heat insulating performance.

RC simple underground wall building form assembled between the RC independent footing foundation building form and the RC independent footing foundation building form assembled under each pillar of the outer periphery of a factory or other building And a partial plan view of the RC independent footing foundation and the RC simple underground wall integrally constructed by these molds. It is a partial front view of the RC independent footing foundation building form shown in FIG. 1 and the RC simple underground wall building form. FIG. 2 is a cross-sectional view taken along the line II in FIG. 1. FIG. 2 is a cross-sectional view taken along the line in FIG. 1. FIG. 5A is a cross-sectional view taken along the line ha-ha in FIG. 2, and FIG. 5B is a cross-sectional view taken along the line 2--2 in FIG. 2. FIG. 6 (a) is a front view of the steel support, FIG. 6 (b) is a side view of the steel support, and FIG. 6 (c) is a plan view of the steel support. FIG. 7 (a) is a plan view of the steel mold, and FIG. 7 (b) is a front view of the steel mold.

  FIGS. 1 to 5 show an RC independent footing foundation building form 1 (hereinafter referred to as “RC foundation building form”) assembled at a position where each pillar is arranged on the outer periphery of a building such as a factory or a warehouse. RC simple underground wall building form 2 assembled between each RC foundation building form 1, 1, and RC independent footing foundation and RC underground wall constructed integrally by these forms It is.

  In the figure, the RC foundation building form 1 is assembled at a substantially center position of the footing form 4 and the footing form 4 assembled on the discarded concrete 3 placed on the excavated ground surface deeper than the freezing depth. In particular, the column form 5 is referred to as a floating form, and is assembled in a state where it is floated by the height of the footing form 4 from the upper surface of the discarded concrete 3 (FIG. 3). reference). The column mold 5 is supported by a floating mold (not shown) and is assembled so that the height can be adjusted freely.

  Also, one side surface 5A of the four side surfaces of each column formwork 5 and the outer formwork of each RC simple underground wall construction formwork 2 are assembled in a vertical plane substantially the same as the position of the outer wall of the building, and both Both are assembled by a plurality of steel columns 6 standing at regular intervals and a plurality of steel molds 7 installed between the steel columns 6 and 6 (see FIGS. 1, 3 and 4). In particular, the steel mold 8 of each column mold 5 is assembled in a substantially U shape when viewed in plan so as to integrally form three side surfaces 5B excluding the side surface 5A of the column mold 5 (FIG. 1). reference).

  Further, in both the RC foundation building form 1 and the RC simple underground wall building form 2, the spacing between the facing molds is kept constant by a plurality of separators 9. In the column mold 5 of the building mold 1 and the RC underground wall building mold 2, a plurality of separators 9 are installed between the steel molds 7 and the steel molds 8.

  The steel struts 6 are configured to be capable of self-supporting by attaching a rectangular plate-like base plate 6b to the lower end portion of a strut body 6a made of a shape steel such as H-section steel, and a plurality of steel struts 6 are provided on each opposing side surface of the strut body 6a. Angle pieces 10 and 10 are attached.

  The angle pieces 10 and 10 are attached symmetrically inside the left and right flanges 6c and 6c of the column main body 6a, and a plurality of sets are attached at intervals in the axial direction (longitudinal direction) of the column main body 6a.

  Furthermore, the angle pieces 10 and 10 are attached so as to form a certain gap (engagement groove) between one flange 10a of each angle piece 10 and one flange 6c of the column main body 6a.

  Further, a height adjustment nut 11 is attached to the base plate 6b (see FIG. 6), and a height adjustment bolt 12 is vertically screwed to the height adjustment nut 11 so that the verticality and height of the steel column 6 can be increased. Can be corrected.

  The height adjustment nut 11 is attached so that a through hole (not shown) formed in the base plate 6b and a screw hole communicate with each other, and the lower end of the height adjustment bolt 12 screwed into the height adjustment nut 11 is attached. The portion projects through the through hole below the base plate 6b.

  The steel struts 6 configured in this way are built on the discarded concrete 3 at regular intervals. And it is built so that it may not fall by throwing away the base plate 6b with anchor bolts 13, such as a hole-in anchor, and fixing on the concrete 3. FIG.

  The steel mold 7 and the steel mold 8 are configured by horizontally attaching a plurality of steel reinforcing rib members 14b to the outer surface of a rectangular thin steel plate 14a. Further, a heat insulating material 14c such as styrofoam is attached to the inner surface of the thin steel plate 14a.

  Further, the steel mold 8 of each column mold 5 is integrally formed in a substantially U shape when viewed in plan so that the three side surfaces 5B of the column mold 5 are integrally formed. The steel reinforcing rib member 14b is formed of an angle material or the like.

  In particular, the lower ends of the thin steel plates 14a of the steel molds 7 and 8 installed in contact with the foundation building form 1 are notched along the shape of the footing form 4 (see FIG. 2).

  The steel molds 7 and 8 configured in this way are opposed to each other on the abandoned concrete 3 between the steel supports 6 and 6, respectively, and the steel mold 7 provided with the heat insulating material 14c is frozen on the ground. It is built on the side, ie outside the building.

  Further, a heat insulating material 15 is interposed between the steel molds 7 and 8 and the discarded concrete 3, thereby absorbing the unevenness of the discarded concrete 3 (see FIG. 5 (b)).

  Moreover, both ends of each thin steel plate 14a of the steel molds 7 and 8 are respectively inserted into gaps between one flange 6c of the column main body 6a and one flange 10a of the angle piece 10 in each of the steel columns 6 and 6, And it is fixed to the flange 6c of the column body 6a by a screw member (see FIG. 5).

  In addition, the steel mold 8 of each column mold 5 is fixed by fastening attachment pieces formed at both ends thereof to the flanges of the columns 6 and 6 with screw members.

  The steel frame 16 for the foundation is arranged in the column mold 5 of each RC foundation building mold 1 assembled in this way, the hoop reinforcement 17 for the foundation is arranged around it, and further in the footing mold 4 Has a footing reinforcement (not shown). In addition, wall reinforcing bars 18 assembled in a lattice pattern are arranged in the RC simple underground wall building form 2.

  Then, concrete is continuously placed in both the RC foundation building form 1 and the RC simple underground wall building form 2 so that the independent footing foundation A and the RC simple underground wall B are integrated. Has been built.

  Moreover, the underground beam 19 is installed between the independent footing foundations A and A, and the floor slab C on the first floor is constructed by placing concrete thereon.

  Moreover, the steel frame 20 is built on the independent footing foundation A, the trunk | drum 21 is attached to the outdoor side, and also the outer wall D is comprised by attaching the exterior material 22 to the outdoor side. In particular, the waist wall 23 near the ground surface is provided with an exterior material in consideration of dirt and scratches.

  Next, a method for constructing the RC simple underground wall using the RC simple underground wall building form will be described.

(1) First, dig the ground deeper than the freezing depth. Although the depth of freezing varies depending on the location, it is generally sufficient to dig about 0.7 to 1.3 m + 0.1 m from the ground surface.

(2) Next, discard concrete 3 is placed on the excavated ground surface, and the necessary ink is printed on it. Then, a plurality of steel columns 6 are erected at regular intervals on the discarded concrete 3 in accordance with the position where the marking is performed.

(3) Next, the verticality of the column main body 6 a is adjusted by the height adjusting bolt 12. Then, by fixing the base plate 6 b on the discarded concrete 3 with the anchor bolts 13, the column main body 6 a is made self-supporting.

(4) Next, a heat insulating material 15 is laid in a strip shape on the discarded concrete 3 between the steel columns 6 and 6, and one central portion is discarded and secured with a nail so as not to be displaced on the concrete 3.

(5) Next, the steel mold 7 and the steel mold 8 are built on the heat insulating material 15 between the steel columns 6 and 6 first from the steel mold 7. In particular, the steel mold 7 is built on the frozen ground side, that is, outside the building, and only the thin steel plate 14a is built first, and then the heat insulating material 14c is built inside the thin steel plate 14a.
Further, both end portions of the thin steel plate 14a are inserted into gaps between one flange of the column main body 6a and one flange 10a of the angle piece 10, and are fastened to the flange of the column main body 6a by screw members. The heat insulating material 14c is fixed to the inner side surface of the thin steel plate 14a of the steel mold 7 with a double-sided tape.

(6) Next, a reinforcing bar 18 is built between the steel mold 7 and the steel mold 8, and a plurality of separators 9 are passed through both of the molds to install the steel mold. 7 and the steel mold 8 are fixed to each other. The reinforcing bars 18 are arranged with unit bars that are assembled in advance in a grid pattern.
The RC simple underground wall construction form 2 is completed by the above construction procedure.

(7) And RC simple underground wall B is completed by placing concrete in the RC simple underground wall construction form 2 and curing it.

  The present invention does not require a special type of work such as formwork, and can greatly reduce costs, shorten the construction period, and the like as compared with general construction methods.

DESCRIPTION OF SYMBOLS 1 Formwork for RC foundation 2 Formwork for RC simple underground wall construction 3 Discarded concrete 4 Footing formwork 5 Column formwork 6 Steel column 6a Column body 6b Base plate 6c Flange (joint)
7 Steel formwork (outer formwork)
8 Steel formwork (inner formwork)
9 Separator 10 Angle piece 10a One flange 11 of the angle piece 11 Height adjusting nut 12 Height adjusting bolt 13 Anchor bolt 14a Thin steel plate 14b Steel reinforcing rib member 14c Insulating material 15 Insulating material 16 Steel frame material 17 Foundation hoop 18 Wall reinforcement 19 Underground beam 20 Steel column 21 Trunk edge 22 Exterior material 23 Waist wall

Claims (5)

RC simple underground wall construction burial mold for frost heave measures installed continuously between the RC foundation construction molds placed at intervals on the excavation ground surface deeper than the freezing depth A plurality of steel struts standing on the excavation ground surface deeper than the freezing depth and spaced from each other within one section of the steel struts on the excavation ground surface between the steel struts. disposed opposite to, and both end portions is composed of a plurality of steel formwork attached stopped on the steel strut, the steel post at the lower end of the strut body and the strut body made of H-beams is composed of a mounted base plate, the steel formwork is composed of a plurality of steel reinforcing rib member which is attached to the outer surface of the steel sheet and the steel sheets, both end portions of the steel formwork the attached stopped respectively on the inside of the flange of the steel struts and placed in frozen ground side steel For heaving measures, characterized in that the heat insulation material is attached to the inner surface of the mold RC simple diaphragm wall construction for buried formwork.   The embedded formwork for RC simple underground wall construction for anti-frost heave use according to claim 1, wherein height adjustment bolts are attached to the base plate. The embedded form for RC simple underground wall construction for frost heave prevention according to claim 1 or 2 , wherein a plurality of angle pieces are attached to side portions of the web facing the column main body, and the steel is interposed between the angle piece and the flange. An embedded formwork for building RC simple underground walls for frost heave prevention, characterized by inserting the end of the formwork. In the construction method of the RC simple underground wall for frost heave prevention by the embedded formwork for RC simple underground wall construction for frost heave countermeasure according to any one of claims 1 to 3, the step of digging the ground to a depth below the freezing depth, dug down Steps for installing RC foundation building forms on the excavation ground surface at intervals, steps for standing steel columns on the excavation ground surface between the RC foundation building forms at regular intervals, each steel A step of placing the steel molds opposite to each other on the excavation ground surface between the columns and placing the steel molds provided with a heat insulating material on the frozen ground side; and both ends of the steel molds Antifreezing measures characterized by comprising the steps of fastening to the inside of the flange of the steel support and the step of placing concrete in the RC foundation building form and the RC simple underground wall building form RC simple underground wall construction method.   5. The RC simple underground wall for frost heave measures according to claim 4, further comprising a step of laying a heat insulating material on the excavation ground surface between the steel columns. Building construction method.

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