JP6263816B2 - Insert kit - Google Patents

Description

  The present invention relates to an insert kit that can improve productivity in a factory or the like with respect to a precast concrete foundation beam joint member used for foundation construction of a building such as a general house.

Conventionally, a concrete base beam member made of concrete with a vertically long cross-sectional shape and a concrete base beam part joining member made of concrete whose vertical cross-sectional shape is an inverted U-shape are mass-produced in advance at a factory, etc. A construction method is known in which a solid foundation of concrete is constructed in a short period of time by integrally connecting at a construction site (see Patent Documents 1 and 2).
In the present specification, the foundation beam member is referred to as “precast concrete foundation beam member” or simply “foundation beam member”, and the foundation beam part joining member is referred to as “precast concrete foundation beam part joining member” or simply “ This is expressed as “joining member”.

The above construction method will be described in detail. First, two precast concrete foundation beam members are arranged at predetermined intervals in the longitudinal direction at the construction site.
In the foundation beam member, main bars (structural reinforcing bars) and shear reinforcement bars are connected and embedded in a substantially lattice pattern. -Shaped precast concrete foundation beam joints are placed. Then, by placing concrete from an opening or the like provided on the upper surface of the joining member, the rising portion composed of the foundation beam member and the joining member and the bottom plate are integrally connected, and a solid solid foundation made of concrete is provided. Is completed.
Unlike the construction method in which reinforcing bars are assembled at the construction site as before and concrete is placed by fixing the formwork at the position where these reinforcing bars are sandwiched by using foundation beam members and joining members, the construction work is simplified. , Shortening the construction period and improving aesthetics.

JP 2008-175036 A JP 2011-064047 A

The invention according to the patent application cited as the above prior art document was made by one of the inventors of the present application, but there is still room for improvement from the viewpoint of improving the productivity of the basic beam member and the joining member in a factory or the like. was there.
That is, in order to improve productivity, it is necessary to perform assembling and demolding operations as quickly as possible.
However, with regard to the joining member, for example, there is a problem that it is difficult and time consuming to remove the concrete block formed in an inverted U shape from the formwork.

In addition, it is common to place a plurality of openings at predetermined locations on the side plate of the formwork and place concrete in the cavity while positioning the rebar by passing the rebar through this opening. Since the rebars exposed to the outside are bent or entangled, there is a problem that it is difficult and time consuming to remove the rebar from the opening of the side plate.
Moreover, the number, position, and diameter of the reinforcing bars embedded in the foundation beam member and the joining member are various. Therefore, it is necessary to prepare a side plate in which the number, position, and diameter of the openings are changed in accordance with the types of the base beam member and the joining member in the factory, which causes a problem that the productivity is deteriorated and the mold manufacturing cost is increased. there were.
In general, inserts are embedded in the foundation beam member and the joining member. Normally, concrete is placed in a state in which a male screw such as a bolt is screwed into a female screw portion of the insert and the insert is temporarily fixed to a mold frame by fastening with a nut. And after curing, the mold will be removed, but it takes time to remove the temporary fixing bolts, nuts, etc. from the mold, and the concrete aqueous solution enters the female screw part and the bolts are fixed. was there.
In addition, for example, since it is difficult for the operator's hand to reach the lower part of the formwork or in a complicated place, it is difficult to turn the bolts and nuts with hands or tools, which takes time.
In addition, the foundation beam member is arranged in the longitudinal direction at the construction site, and the concrete is placed after positioning. However, the positioning of the foundation beam member, which is a heavy object, is not easy. There was a problem that the workability deteriorated.

  In view of such problems, an object of the present invention is to provide an insert kit capable of improving the productivity of a precast concrete foundation beam joint member in a factory or the like.

The insert kit of the present invention is a cylindrical main body portion having a female screw hole on the inner peripheral surface, a cylindrical cap that covers the outer periphery of the front end of the main body portion in a watertight state, and a rod-shaped member in the longitudinal direction. And a front end surface of the cap that is orthogonal to the central axis of the opening of the cap, and is located on the front side of the flange of the jig. The end portion is fixed with a nut from the inner surface side of the side plate of the mold through an opening provided in the side plate, and the end portion on the rear side of the flange portion of the jig passes through the opening of the cap and the main body. The front end surface of the cap is slidably held on the inner peripheral surface of the portion, and the main body portion is temporarily fixed in a state orthogonal to the side plate by contacting the flange portion. To do.

According to the insert kit of the present invention, when assembling the formwork, when the insert is fitted into a jig fixed to the side plate, the rear end of the jig slides back in the axial direction inside the main body. It is bound to the inner surface of the cap. Therefore, the operator can temporarily fix the insert without performing a complicated operation. Further, when the mold is removed, when the side plate is unfolded, the jig fixed to the side plate is detached from the cap while sliding in the main body portion axially forward. That is, it is not necessary to perform time-consuming complicated operations such as turning bolts when assembling and removing the mold, and the working time can be shortened. In particular, when the insert is disposed below the formwork or in a complicated place, the working time can be greatly reduced.
Moreover, since the front end surface of the cap is in close contact with the mold frame via the jig, even when an external force is applied to the insert when placing concrete, the state where the insert is perpendicular to the mold frame can be maintained.

In addition, since the cap covers the outer periphery of the tip of the main body in a watertight state, water-soluble concrete components can be prevented from entering the inner peripheral surface of the main body during molding, and the tip of the main body can be exposed on the surface of the concrete block. Therefore, the occurrence of rust at the tip of the main body can be prevented.
The rear end of the jig slides on the inner peripheral surface of the main body. In other words, since the cross-sectional shape of the end of the jig is formed to be almost the same as the cross-sectional shape of the inner peripheral surface of the main body, it is possible to prevent wobbling of the insert when placing concrete, and to accurately base the insert. Can be embedded in beam members.

It is the schematic which shows the external appearance of the precast concrete foundation beam member and the member for precast concrete foundation beam part joining, and arrangement | positioning in a construction site. It is the top view (a) and left view (b) which show the formwork for manufacture of a foundation beam member. A right side view (a) and a longitudinal sectional view (b) showing the base, a right side view (c) showing the attachment, a front view (d) showing the first and second small pieces of the attachment, and the attachment attached to the base It is a right view (e) which shows a state. It is a perspective view which shows the other structural example of a base and an attachment. It is a front view which shows the formwork for manufacture of the foundation beam member in 2nd Embodiment. They are the front view (a) which shows an attachment, the front view (b) and top view (c) which show a base, and the front view (d) which shows the state which attached the attachment to the base. It is a perspective view which shows an attachment and a base. It is the front view (a) and longitudinal cross-sectional view (b) which show the state which attaches the attachment of another structural example to a base. It is a longitudinal cross-sectional view which shows the mold for manufacture of the member for joining. It is a side view which shows an insert kit. It is a longitudinal cross-sectional view of an insert kit. It is a longitudinal cross-sectional view which shows the state which attached the insert kit to the side plate. It is a perspective view which shows the positioning metal fitting for precast concrete foundation beam members. It is a perspective view which shows the positioning metal fitting for precast concrete foundation beam members. It is an AA line arrow directional view of FIG. It is a right view of the positioning metal fitting for precast concrete foundation beam members. It is a perspective view which shows the positioning method.

[First embodiment]
A first embodiment of a formwork for manufacturing a precast concrete foundation beam member will be described.
FIG. 1 is a schematic view showing the appearance and arrangement of a precast concrete foundation beam member 1 and a precast concrete foundation beam part joining member 2 at a construction site. As will be described in detail later, the cap 62 of the insert kit 60 is exposed on the upper surface of the foundation beam member 1, and the positioning member 70 for the precast concrete foundation beam member is attached to the lower surface of the leg portion 3. Reinforcing bars (main bars) 4 are exposed from the side of the steel.
As shown in FIG. 2, the formwork 10 for manufacturing the foundation beam member includes a bottom plate 11 and four side plates 12 rising in a vertical direction (vertical direction) from the peripheral edge of the bottom plate 11, and casts concrete. The cavity portion has a substantially box shape with the upper portion opened by the bottom plate 11 and the side plate 12.
Actually, since the leg portion 3 needs to be integrally formed on the lower side of the foundation beam member 1, the front side plate 12 is used for forming the leg portion 3 in a plan view shown in FIG. A convex portion 13 is provided.

The left and right side plates 12 correspond to the side plates for forming the small edge surface. Each of the left and right side plates 12 includes an attachment 20 and a base 30 shown in FIG.
In FIGS. 3A to 3E, the front, back, left, right, up and down directions are indicated by arrows, but these directions are based on the state in which the attachment 20 and the base 30 shown in FIG. ing. Unless otherwise indicated, each figure after FIG. 4 also indicates a direction based on the state of FIG.
The attachment 20 is a so-called positioning member for fixing a reinforcing bar (main reinforcing bar) 4 embedded in the foundation beam member 1 at an appropriate position, and is formed of a metal having magnetic adhesion properties such as iron.
Specifically, when two reinforcing bars 4 are embedded in the upper part of the precast concrete foundation beam member 1 in an upright state and three reinforcing bars 4 are embedded in the lower part, two pieces for passing the upper two reinforcing bars 4 through the attachment 20 are used. Three openings 21 for passing the opening 21 and the lower three reinforcing bars 4 are provided, and three pieces (first to third pieces 20a to 20c) are divided so as to divide the five openings 21. ).

The diameter of each opening 21 is set to be a size corresponding to the diameter of the reinforcing steel bar 4 to be embedded. For example, when a deformed steel bar is used as the reinforcing steel bar 4, the diameter is slightly larger than the nominal diameter. Is preferred.
Further, by preparing a plurality of types of attachments having different diameters of the openings 21, it is possible to quickly prepare a formwork corresponding to a plurality of types of reinforcing bars 4 having different diameters.

The base 30 is a metal member for holding the attachment 20 including the three small pieces 20a to 20c. Specifically, a recess 31 having substantially the same shape as the outer shape of the attachment 20 is provided to store the attachment 20. In the case of the left side plate 12, the recess 31 has a concave shape so that the left side becomes the bottom in the longitudinal sectional view shown in FIG.
The base 30 is provided with magnets 32 at positions corresponding to the small pieces 20a to 20c, and further provided with openings 33 through which the reinforcing bars 4 are passed.
Therefore, as shown in FIG. 3 (e), each of the small pieces 20 a to 20 c is embedded in the recess 31 of the base 30 and the rebar 4 is passed through the opening 21 of the attachment 20, so that the attachment 20 is magnetically held on the base 30. The reinforcing bar 4 can be positioned.

When concrete is placed on the mold 10 in this state, external force from the concrete to the attachment 20 is mainly applied in the vertical direction (vertical direction) and from the inside of the mold to the outside. The side surface is held in contact with the inner side surface of the recess 31 of the base 30. That is, since the attachment 20 is restricted from moving in the vertical direction and the outside by the base 30, the external force directed to the vertical direction and the outside is transmitted to the base 30 via the attachment 20, and the mold 10 is further placed. Therefore, the small pieces 20a to 20c do not fall off from the base 30.
Moreover, since the diameter of the opening 21 of the attachment 20 is slightly larger than the diameter of the reinforcing bar 4, the amount of concrete leaking to the outside through the opening 21 of the attachment 20 can be suppressed to almost zero or very slightly. .
In addition, in order to form two upper and lower shear cotters 5 (see FIG. 1) on the small edge surface of the precast concrete foundation beam member 1, trapezoidal convex portions 22 (see FIG. 3) for forming shear cotters are provided at corresponding positions of the attachment 20 and the base 30. (D)) and 34 are provided.
In addition, it is good also as what attaches the magnet 32 to each small piece 20a-20c side, and as shown to Fig.4 (a) and (b), the magnet which provided the opening 23a for positioning in the center is used as the attachment 23, The base 35 may be provided with a recess 35a that can accommodate the attachment 23 and an opening 35b that is larger in diameter than the positioning opening 23a. In this case, it is only necessary to prepare a plurality of attachments 23 with different diameters of the openings 23a and replace them with the base 35 as appropriate, so that productivity in the factory can be improved.

[Second Embodiment]
Next, the second embodiment of the formwork for manufacturing the precast concrete foundation beam member will be described, but the description of the same parts as those of the first embodiment will be omitted. The formwork of the present embodiment is particularly suitable for reinforcing bars bent in an L shape.
As shown in FIG. 5, in the present embodiment, the side plate 41 constituting the mold 40 has a front side plate 41, that is, a side plate 41 for forming the lower surface of the precast concrete foundation beam member 1 in a standing state. An attachment 42 and a base 43 for positioning the reinforcing bar (shear reinforcing bar) 4 are provided.

As shown in FIG. 6A, the attachment 42 is configured by a substantially rectangular thin plate extending up and down, and includes a semicircular opening 42a through which the reinforcing bar 4 passes. In addition, a protrusion 42b that protrudes to the left side is provided at the substantially central portion.
As shown in FIG. 6 (b), the base 43 is made of a thin metal plate having a magnetic adhesion property such as iron extending in the left-right direction, and has almost the same shape as the outer shape of the attachment 42 for storing the attachment 42. The recess 43a is provided. The concave portion 43a has a concave shape so that the rear side is the bottom in a plan view shown in FIG.
A magnet 43b is attached to the position of the recess 43a corresponding to the protrusion 42b of the attachment 42.

Further, the base 43 includes a semicircular opening 43c at a position facing the semicircular opening 42a of the attachment 42 in a state where the attachment 42 is stored in the recess 43a. The substantially circular opening formed by the opening 42 a of the attachment 42 and the opening 43 c of the base 43 is used as a positioning opening for the reinforcing bar 4.
That is, as shown in FIGS. 7A and 7B, the attachment 42 is embedded in the recess 43a of the base 43, and the attachment 42 is magnetically attached to the base 43 by passing the L-shaped rebar 4 through the circular opening. The reinforcing bar 4 can be positioned in the held state.
At the time of demolding, as shown in FIG. 7B, when the side plate 41 is rotated around the axis L1 in the direction indicated by the arrow, the attachment 42 is pushed upward by the rebar 4 to release the magnetic adhesion, Since it naturally falls off from the recess 43a, the demolding operation can be completed quickly. The attachment 42 may be manually removed by the operator.
Also, as shown in FIGS. 8A and 8B, a semicircular opening 44a is provided at the lower end portion of the attachment 44, and an opening 45a extending in the vertical direction and having a semicircular lower end portion is provided in the base 45. The structure to provide may be sufficient. In this case as well, the attachment 44 is fitted into the recess 45 b of the base 45, and the substantially circular opening formed by the semicircular opening 44 a of the attachment 44 and the semicircular opening 45 a of the base 45 is positioned in the rebar 4. It can be used as an opening for use.

Next, an embodiment of a formwork for manufacturing a precast concrete foundation beam joint member will be described.
As shown in FIG. 9A, the formwork 50 for manufacturing the precast concrete foundation beam joint member includes an outer mold 51 and an intermediate mold 52.
The outer mold 51 is formed in a box shape having an upper portion opened by a bottom plate 51a and four side plates 51b that rise in the vertical direction from the peripheral edge of the bottom plate 51a.
The middle mold 52 is supported by one side plate 51b (in this embodiment, the rear side plate) of the four side plates 51b so as to be rotatable in a vertical plane with respect to the bottom plate 51a.
The cavity 53 is formed in a substantially U shape by the outer mold 51 and the middle mold 52, and the concrete block 54 can be formed in an inverted U shape by pouring concrete into the cavity 53.

  At the time of demolding, the concrete block 54 is pulled out upward (in the direction of the arrow in the figure) using a lifting tool fastened to the insert while the middle shape 52 is rotated upward as shown in FIG. 9B. become. Here, the middle mold 52 is structured to be integrally connected to the table 55 that supports the mold 50 via the side plate 51b, and an external force that pulls the concrete block 54 downward by the weight of the mold 50 and the table 55 acts. Therefore, the concrete block 54 can be easily peeled off from the middle mold, whereby the precast concrete foundation beam part joining member 2 can be easily manufactured.

Next, an embodiment of the insert kit of the present invention will be described.
As shown in FIG. 10, the insert kit 60 includes a main body 61, a cap 62, and a jig 63.
As shown in FIG. 11, the main body 61 is a cylindrical metal member having a female screw hole 61a on the inner peripheral surface. In the present embodiment, two deformed steel bars are joined as extension members 64 from the side surface of main body 61 toward the rear.
The cap 62 is made of a cylindrical synthetic resin whose outer diameter is tapered toward the tip. In addition, a locking portion 62a is provided at the rear end of the cap 62, and covers the outer periphery of the front end of the main body 61 in a watertight state by engaging with the protrusion 61b at the front end of the main body.
The jig 63 is a rod-shaped member having a flange portion 63a and a step portion 63b in the center. At the time of concrete block molding, the front end of the jig 63 is attached to the side plate of the mold, and the step portion 63b is the inner periphery of the opening 62b of the cap 62. It fits into the surface 62 c, and the rear end is held on the inner peripheral surface of the female screw hole 61 a of the main body 61.

Next, how to use the insert kit will be described.
As shown in FIG. 12, the operator can move the side plate 65 through an opening provided at a predetermined position of the side plate 65 of the mold (for example, a position where the upper surface of the foundation beam member 1 or the bottom of the leg portion 3 is formed). The jig 63 is inserted from the inner surface side (the inner surface side of the cavity), and the front end portion of the jig 63 is fixed to the side plate 65 with the nut 66, so that the rear end portion of the jig 63 is attached to the side plate 65. It is in a state of protruding to the inner surface side.
Next, the rear end of the jig 63 is inserted into the main body 61 from the opening 62 b of the cap 62. Here, the rear end portion of the jig 63 is formed to have such a dimension that it can slide on the inner peripheral surface of the female screw hole 61 a of the main body portion 61. Further, since the front end surface of the cap 62 is formed so as to be orthogonal to the central axis L2 of the opening 62b of the cap 62, the cap 62, the main body 61 and the extension member 64 are connected to the side plate 65 via the jig 63. It is temporarily fixed in a state orthogonal to.

When concrete is poured into the cavity of the mold in this state, an external force is applied downward from the concrete to the cap 62, the main body 61, and the extension member 64, and shear stress and moment due to the external force are generated. Since the rear end of the jig 63 has a length that extends to the middle position of the main body, it has a strength that can sufficiently resist these shear stresses and moments.
When the side plate 65 is unfolded at the time of demolding, the rear end of the jig 63 fixed to the side plate 65 slides forward inside the main body 61 and comes out of the cap 62. Therefore, the efficiency of demolding work is improved.

Next, an embodiment of a positioning metal fitting for a precast concrete foundation beam member will be described.
As shown in FIGS. 13 and 14, the positioning metal fitting 70 includes a plate-like main body portion 71 having a substantially rectangular shape in plan view, and two hanging portions 72 extending downward from left and right peripheral edge portions of the main body portion. As shown in FIG. 15, the longitudinal cross-sectional shape is formed in a U-shape.
Further, the positioning fitting 70 has two front and rear connection bolts 73 for connecting to the foundation beam member 1 and two front and rear positioning bolts 74 for adjusting the vertical height and inclination of the foundation beam member 1. And notches 75 formed at the four corners of the main body 71 for adjusting the horizontal position of the foundation beam member 1.

As shown in FIG. 16, the positioning metal fitting 70 is attached to the foundation beam member 1 by inserting the connecting bolt 73 into the insert 3 a embedded in the leg portion 3 of the foundation beam member 1. Note that FIG. 16 is a right side view of the positioning metal fitting 70, and the insert 3a and the connecting bolt 73 shown by dotted lines are not actually visible.
Since a large load and moment are applied to the positioning metal member 70 from the foundation beam member 1, as shown in FIG. 15, a rib 76 as a reinforcing portion that is parallel to the hanging portion 72 and extends to the vicinity of the notch portion 75 is provided. Is formed.
Further, since the main body 71 is formed of a thin plate, a female thread 77 for inserting the positioning bolt 74 is provided extending downward from the lower surface of the main body.

When finely adjusting the vertical position and inclination of the foundation beam member 1, the positioning bolt 74 is turned in a state where the front and rear ends of the positioning bolts 74 are in contact with the iron plate 78, and the main body portion 71. This is done by adjusting the exposed length of the positioning bolt 74 on the lower surface side of the.
Further, when finely adjusting the position of the foundation beam member 1 in the horizontal direction (front / rear / left / right direction), as shown in FIG. 17, the tool 79 is pushed into the notch 75 and moved in the direction of the arrow. Although FIG. 17 shows the positioning in the left-right direction, the positioning in the front-rear direction is the same.
In addition, the structure shown in the said embodiment can be suitably changed in the range which does not deviate from the meaning of this invention. For example, the number of rebars (main bars) 4 embedded in the foundation beam member 1 is two upper parts and three lower parts. However, the number of reinforcing bars 4 may be one or more, and depending on the number and arrangement of reinforcing bars 4, the attachment 20 and the base What is necessary is just to change the structure of 30 suitably.

  It is an insert kit that can improve the productivity of precast concrete foundation beam joint members in factories and the like, and has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Precast concrete foundation beam member 2 Precast concrete foundation beam part joining member 3 Leg part 4 Reinforcement 10 Foundation beam formwork 11 Bottom plate 12 Side plate 13 Convex part 20 Attachment 20a First small piece 20b Second small piece 20c First Three small pieces 21 Opening 22 Protruding part 23 Attachment 23a Opening 30 Base 31 Concave 32 Magnet 33 Opening 34 Protruding part 35 Base 35a Concave 35b Opening 40 Form 41 Side plate 42 Attachment 42a Opening 42b Protrusion 43 Base 43a Concave 43b Magnet 43c Opening 44 Attachment 44a Opening 45 Base 45a Opening 45b Recess 50 Formwork 51 for manufacturing precast concrete foundation beam joint member Outer mold 51a Bottom plate 51b Side plate 52 Middle mold 53 Cavity 54 Concrete block 55 Table 60 Inserter Kit 61 Main body portion 61a Female thread hole 61b Protrusion 62 Cap 62a Locking portion 62b Opening 62c Inner peripheral surface 63 Jig 63a Hook portion 64 Extension member 65 Side plate 70 Positioning bracket 71 Main body portion 72 Hanging portion 73 Connecting bolt 74 Positioning bolt 75 Notch 76 Rib 77 Female thread

Claims (1)

A cylindrical main body having a female screw hole on the inner peripheral surface;
A cylindrical cap that covers the outer periphery of the front end of the main body in a watertight manner;
It is a rod-shaped member and is provided with a jig having a flange at the center in the longitudinal direction,
The front end surface of the front side of the cap is orthogonal to the central axis of the opening of the cap,
An end of the jig on the front side of the flange is fixed with a nut from an inner surface side of the side plate of the mold through an opening provided on the side plate, and is located on the rear side of the flange of the jig. The end is slidably held on the inner peripheral surface of the main body through the opening of the cap ,
The insert kit , wherein the front end surface of the front side of the cap is in contact with the flange portion, whereby the main body portion is temporarily fixed in a state orthogonal to the side plate .

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