JP4366806B2 - Insert holder and method for producing molded body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insert holder used for holding an insert member on a mold for forming a molded body such as a handhole, a manhole or an information box, and a molded body for producing a molded body having the insert member. It relates to the manufacturing method.
[0002]
[Prior art]
Conventionally, in order to hold an insert member in a mold, as shown in FIG. 8, inserts are respectively inserted into bolt insertion holes formed in an outer mold 3A located outside and an inner mold 3B located inside. The opening side end of the nut 2 as a member is abutted from the inner surface side, and the tip of the bolt 13 inserted from the outside into the bolt insertion hole is screwed into the nut 2 to hold the nut 2 on the molds 3A and 3B. Then, after pouring (raw) concrete or the like into the molds 3A and 3B and solidifying, the concrete molded body 1 formed by solidifying after removing the bolts 13 is raised by a crane or the like. The concrete molded body 1 can be detached from the molds 3A and 3B.
[0003]
According to the above method, in order to hold the nut 2 in the inner mold 3B, one worker supports the nut 2 from the inside of the inner mold 3B, and in this state, another worker puts on the floor surface. The bolt 13 must be screwed into the nut 2 from the outside in an unstable posture, being located in the narrow space 15 formed by the inner mold 3 </ b> B from the formed recess 14. Moreover, since steam or the like is blown onto the mold in order to quickly solidify the concrete, the temperature inside the narrow space 15 is very high, and the inner mold 3B under such circumstances It was difficult to install the nut 2 and the burden on the operator was heavy. Reference numeral 16 shown in FIG. 8 denotes a support base for placing and supporting the molds 3A and 3B. Further, as shown in FIG. 8, the outer mold frame is composed of a plurality of outer mold frames 3A, and these outer mold frames 3A are configured to be swingable and openable around the horizontal axes X1 and X2 shown in the figure. By doing so, the nut 2 can be easily attached to and detached from the outer mold 3 </ b> A, but as described above, it is difficult to remove the nut 2 from the inner mold 3 </ b> B.
In order to solve the above problems, Japanese Patent Laid-Open No. 7-232314 has been proposed. This comprises an insert holder from a support provided with a sealing part that closes the opening of the nut, and a protrusion that protrudes from the support and can be deformed in accordance with a hole formed in the mold, A single worker can work from inside the formwork.
[0004]
[Problems to be solved by the invention]
The insert holder having the above-described structure must be installed by forcibly pushing it into the hole of the formwork while deforming the protrusion, and requires an operating force, especially when a large number of nuts are installed. It was a burden for me. In addition, it is conceivable that the projection is made of a soft material that can be easily deformed so that the projection can be easily pushed into the hole. The protrusions could not be softened more than necessary.
In addition, after the concrete is poured and solidified, the protrusions are separated from the support when the concrete body is lifted by a crane or the like to remove the formwork. Therefore, the separated protrusions are collected. In addition to requiring a collection operation to do this, the insert holder cannot be used again.
In addition, since the surface of the support after the division is not flat, it is not only necessary to sharpen it with a scissors or the like so that a finger or the like is not caught on the surface, but also fragments and the like may be scattered during the division. There was room for improvement.
[0005]
In view of the above-mentioned situation, the present invention intends to solve the problem by providing an insert holder that can easily hold an insert member in a mold and that can be reused.
[0006]
[Means for Solving the Problems]
The present invention is an insert holder for holding an insert member on the inner surface side of a mold for forming a molded body such as a handhole or a manhole for solving the above-mentioned problems, and is formed on the mold It is made of a magnet that is supported by penetrating the through-hole of the magnet so that the attracting surface is almost flush with the inner surface of the mold, and a metal material that can be attracted to the attracting surface of the magnet, and is detachable from the insert member And an adsorbing member integrally formed with the insert member.
Therefore, when the insert member is held by the mold, the suction member attached to the insert member or the suction member integrally formed with the insert member is substantially flush with the inner surface of the mold from the through hole formed in the mold. It is attracted to the magnet attracting surface arranged so as to be in the same plane. Thereafter, the concrete is poured into the mold and solidified, and the solidified concrete body is forcibly raised against the magnet's adsorption force using, for example, a crane, thereby removing the mold from the mold. It can be carried out. By removing the adsorbing member from the detached molded body, the adsorbing member can be used repeatedly. The magnet may be an electromagnet in addition to a permanent magnet.
[0007]
By supporting the magnet on a holder that is detachably attached to the outer surface of the formwork, the magnet can be exchanged by removing the holder.
[0008]
By setting the attracting area of the attracting member and the area of the attracting surface of the magnet to be substantially the same, both can be positioned with high accuracy and the attracting member does not easily move with respect to the magnet. .
[0009]
The adsorbing member includes an adsorbing portion having an adsorbing area larger than the outer dimension of the insert member, and a male screw portion that engages with a female screw formed on the insert member.
As described above, by increasing the adsorption force with the magnet by the adsorption portion having an adsorption area larger than the outer dimension of the insert member, the concrete is surely filled into the mold with the fluid pressure of the concrete poured into the mold and the mold. For this reason, it is possible to reliably prevent the adsorption member integrated with the insert member from being changed from the predetermined adsorption position by the vibration applied to the mold or the like, or the adsorption member from being separated from the adsorption surface of the magnet. In addition, since the male thread portion is screwed into the female thread formed on the insert member, the connection between the suction member and the insert member can be made difficult to be released compared to, for example, a plug-in type.
[0010]
A method of manufacturing a molded body in which concrete or the like is poured into a space formed by a mold to form a molded body such as a handhole or a manhole, wherein a magnet is attached to a through-hole formed in the mold and the adsorption surface thereof Is inserted and supported so that it is substantially flush with the inner surface of the mold, and a metal adsorption member having substantially the same area as the magnet adsorption area is held by the insert member or formed integrally with the insert member. After adsorbing the adsorbing member to the magnet, concrete or the like can be poured to form a molded body.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a molded body 1 such as a hand hole or a manhole disposed between buried pipes for connection, branching, passing through, and maintenance inspection after embedment of optical fibers and cables inserted into the buried pipes. This shows a state in which a number of nuts 2 made of metal (which may be made of resin and the material is not particularly limited) are embedded in the molded body 1. That is, after the nut 2 is held by the insert holder 4 on the inner surface side of the upper open-type metal mold 3 arranged on the floor surface, the (raw) concrete is poured into the mold 3 and solidified. It shows the state that was made to. The mold 3 is composed of a cylindrical outer mold 3A located on the outside and a convex inner mold 3B having a bottom contacting the floor and located on the inside. As shown in FIG. 8, the outer mold 3A is configured such that a plurality (only two are shown) of the outer mold 3A can be swingably opened and closed around the horizontal axes X1 and X2 shown in the figure. Since the nut 2 can be easily attached to and detached from the outer mold 3A, the nut 2 may be attached to the outer mold 3A using the insert holder 4 of the present invention, or other methods (conventional methods may be used). The nut 2 may be held at the same position. The outer mold 3A may be a fixed type that cannot swing open and close. The number of nuts 2 is not limited to the number shown in FIG.
[0012]
The insert holder 4 is shown in FIGS. 2 (a), 2 (b) and FIG. The insert holder 4 includes a circular magnet 5 that is supported by a circular through-hole 3K formed in the mold 3 so that the adsorption surface 5A is flush with the inner surface 3C of the mold 3; It is constituted by a metal adsorption member 6 that is detachable from the nut 2 and has the same area as the adsorption surface 5A of the magnet 5. The shape of the magnet 5 may be any shape such as a square, a rectangle or an ellipse in addition to a circle. Further, there is an advantage that the molded body 1 can be smoothly detached from the mold 3 by making the attracting surface 5A of the magnet 5 flush with the inner surface 3C of the mold 3, but the attracting surface 5A of the magnet 5 is used as a mold. The state may be slightly shifted from the inner surface 3C of the frame 3. Further, by setting the adsorption area of the adsorption member 6 to the same area as the adsorption surface 5A of the magnet 5, there is an advantage that the adsorption member 6 can be accurately positioned with respect to the magnet 5, but the adsorption of the adsorption member 6 is advantageous. The area may be set to substantially the same area as the attracting surface 5 </ b> A of the magnet 5. Here, a permanent magnet advantageous in terms of cost is used as the magnet 5, but an electromagnet may be used. When this electromagnet is used, when the molded body 1 is detached from the mold 3, the resistance at the time of separation can be reduced if no magnetic force is generated. The magnetic force of the magnet 5 preferably acts only on the attracting surface of the attracting member 6 and does not act on the mold 3, that is, the outer diameter direction of the magnet 5.
[0013]
After the magnet 5 is inserted into the holder 7 that is open on one side, a bolt 8 inserted from a through-hole formed on the back (rear) surface of the holder 7 is formed on the back (rear) surface of the magnet 5. It can be fixed to the holder 7 by being screwed into the female screw portion. The bolts 9 and 9 inserted through the through holes formed in the flange portions 7A and 7A integrally formed on the outer peripheral surface of the holder 7 are respectively attached to the nuts 10 and 10 fixed to the mold 3 by welding or the like. The holder 7 can be fixed to the mold 3 by screwing. 11 shown in the figure is a packing for sealing between the holder 7 and the mold 3. The holder 7 can be firmly fixed to the mold 3 by bolts 9, 9. For example, a locking hole is formed in the mold 3, and a locking portion that is locked and fixed to the locking hole is provided. It may be carried out by being provided in the holder, or by constituting the holder with a permanent magnet that can be attracted to the magnet 5 and the mold 3, the work of fixing the magnet 5 to the holder with the bolt 8 is made unnecessary. There is an advantage that the magnet 5 can be attached and replaced quickly.
[0014]
2 (a), 2 (b) and FIG. 3, the suction member 6 includes a suction portion 6A having a suction area larger than the outer dimension of the nut 2, that is, the outer diameter, and the nut 2 It is comprised from the external thread part 6B screwed together in the internal thread part 2A. A groove 6M is formed on the surface of the suction portion 6A so that the tip of a minus driver or the like can be locked to rotate the suction portion 6A. The nut 2 and the suction member 6 can be quickly attached and detached. To be able to. 2 (a) and 3 shown in FIG. 3 is that concrete poured into the female thread portion of the nut 2 enters between the opening-side end surface 2D of the nut 2 and the back surface 6D of the suction portion 6A opposed thereto. It is a packing for sealing so as not to be present, but it is not always necessary. By making the suction part 6A of the suction member 6 a suction area larger than the outer diameter dimension of the nut 2, the suction force can be increased, but depending on the weight of the nut 2, etc., as shown in FIG. The outer diameter of the nut 2 can be configured to be substantially the same as the outer diameter. The other configuration shown in FIG. 5 is the same as that shown in FIG.
[0015]
When holding the nut 2 on the mold 3 using the insert holder 4, first, as shown in FIG. 2 (a), the suction member 6 is screwed into the nut 2, and the suction member 6 and the nut 2 are connected. Integrate. In this state, the attracting portion 6A of the attracting member 6 is attracted to the attracting surface 5A of the magnet 5 fixed to the mold 3 (see FIG. 3).
[0016]
After the nut 2 is adsorbed and held on the mold 3 by using magnetic force through the insert holder 4 as described above, (raw) concrete is poured from above the mold 3 to be solidified (steam etc.). The molded body 1 may be obtained by spraying the mold 3 to accelerate the solidification. Next, as shown in FIG. 4A, in order to move the molded body 1 along the contact surface with the mold 3, the molded body 1 is lifted by a crane (not shown) or the like, thereby resisting the magnetic force. The nut 2 is moved in a direction orthogonal to the attracting surface 5A of the magnet 5 to detach the molded body 1 from the mold 3 to obtain the molded body 1 provided with the nut 2 as shown in FIG. . After installing the molded body 1 formed in this way, when a bolt (not shown) is screwed into the nut 2 in order to install a cable rack or the like in the molded body 1, the groove 6M of the adsorption member 6 as described above. It can be easily removed by inserting the tip of a tool such as a flat-blade screwdriver and rotating it. Since the adsorbing member 6 is made of metal, the adsorbing member 6 is hardly bonded to the poured concrete, and the adsorbing member 6 can be easily rotated. The molded body 1 is lifted from the mold 3 by raising the molded body 1. On the contrary, the molded body 1 is held in that position, and the mold 3 placed on an elevator, for example, is placed. The mold 3 may be detached from the molded body 1 by being lowered, or both the mold 3 and the molded body 1 are moved away from each other in the vertical direction so as to be separated from each other. Also good.
[0017]
The nut 2 and the suction member 6 may be configured as shown in FIG. That is, the female screw portion 2A formed on the nut 2 is configured as a two-stage screw of a large-diameter female screw portion 2B located on the opening side and a small-diameter female screw portion 2C located on the back side, and the suction portion 6A of the suction member 6 An opening is formed in the central portion so that the inner surface 6b of the male screw portion 6B and the inner peripheral surface 6a of the suction portion 6A are flush with each other. Therefore, in a state where the suction member 6 is screwed into the nut 2, the inner surface of the suction member 6, that is, the inner surface 6b of the male screw portion 6B and the inner peripheral surface 6a of the suction portion 6A are larger than the valley portion of the small-diameter female screw portion 2C. Since the diameter can be set, a bolt (not shown) can be screwed into the small-diameter female screw portion 2C of the nut 2 without removing the adsorption member 6. The inner surface 6a, 6b of the suction member 6 may be set to have the same diameter as the valley of the small diameter female screw portion 2C.
[0018]
Further, the nut 2 and the suction member 6 may be integrally formed as shown in FIG. By integrally forming in this way, it is possible to reduce the cost by reducing the number of parts, and to eliminate the work of screwing and integrating the two as described above, and to remove the suction member 6 as described above. Can be eliminated.
[0019]
【The invention's effect】
According to the first or fifth aspect, the suction member attached to the insert member or the suction member integrally formed with the insert member is substantially flush with the inner surface of the mold frame from the through hole formed in the mold frame. The insert member can be held on the mold simply by adsorbing it to the magnet's adsorption surface arranged so that the insert member can be easily held on the mold by one operator. it can. Also, for example, by using a crane or the like to forcibly raise the magnet against the attracting force, it is detached from the mold, and the attracting member is removed from the detached molded body, thereby repeatedly using the attracting member. be able to. By providing the insert holder with a locking portion that can be locked and unlocked on the locked portion formed on the mold, a finger or the like can be applied to the surface that has been divided in the case of the conventional method. It is not necessary to sharpen the outer surface with a scissors or the like so as not to get caught, and debris and the like are not scattered at the time of cutting.
[0020]
According to the second and sixth aspects, the magnet can be easily and quickly replaced with a new magnet by removing the holder and supporting the magnet on a holder that is detachably attached to the outer surface of the mold. This is advantageous in terms of maintenance.
[0021]
According to the third aspect, by setting the adsorption area of the adsorption member and the area of the adsorption surface of the magnet to be substantially the same, both can be positioned with high accuracy and the adsorption member is easy with respect to the magnet. Therefore, the insert holder can be configured with high reliability.
[0022]
According to claim 4 and claim 7, by increasing the adsorption force with the magnet by the adsorption part having an adsorption area larger than the outer dimension of the insert member, the flow pressure of the concrete poured into the mold and the inside of the mold The suction member integrated with the insert member is changed from the predetermined suction position by the vibration applied to the mold to reliably fill the concrete, and the suction member is reliably prevented from detaching from the magnet suction surface. can do. In addition, since the male thread portion is screwed into the female thread formed on the insert member, the connection between the suction member and the insert member can be made difficult to be released compared to, for example, a plug-in type. Therefore, there is no occurrence of defective products such as the position of the insert member deviating from the predetermined position, which can be advantageous in terms of manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where an insert member is embedded in a molded body.
FIG. 2A is an explanatory view showing a state immediately before the adsorption member is screwed into the nut, and FIG. 2B is a front view of the adsorption member.
FIG. 3 is a cross-sectional view showing a state in which concrete is poured after a nut is fixed to a mold frame by an adsorption force of an insert holder.
FIG. 4A is a cross-sectional view showing a state where the molded body is slightly raised in order to remove the molded body from the mold, and FIG. 4B shows a state where the molded body is raised and removed from the mold. It is sectional drawing.
FIG. 5 is a cross-sectional view showing a case where another adsorbing member having a different adsorbing part size is used, in which concrete is poured after a nut is fixed to a mold frame by an adsorbing force of an insert holder.
FIG. 6 is a cross-sectional view showing a state in which an adsorption member is screwed into another nut.
FIG. 7 is a cross-sectional view showing a case where a nut and a suction member are integrally formed.
FIG. 8 is a cross-sectional view showing a conventional example in a state where an insert member is embedded in a molded body.
[Explanation of symbols]
1 Molded body 2 Nut (insert member)
2A Female thread 2B Large diameter female thread
2C Small diameter female thread part 2D End face 3 Formwork
3A outer formwork 3B inner formwork
3C Inner surface 3K Through hole 4 Insert holder 5 Magnet
5A Suction surface 6 Suction member
6A Suction part 6B Male thread part
6a Inner surface 6D Back
6M Groove 7 Holder 7A Flange
8,9 bolt 10 nut
11,12 Packing 13 bolt
14 Recess 15 Space
16 Support stand S Clearance

Claims (7)

An insert holder for holding an insert member on an inner surface side of a mold for forming a molded body such as a hand hole or a manhole, wherein an adsorption surface is formed in a through hole formed in the mold. And a magnet that is penetrated and supported in a substantially flat state, and a metal material that can be adsorbed to the adsorption surface of the magnet, and is detachably attached to or integrally formed with the insert member. An insert holder comprising an adsorbing member. The insert holder according to claim 1, wherein the magnet is supported by a holder removably attached to an outer surface of the mold. The insert holder according to claim 1, wherein the adsorption area of the adsorption member and the area of the adsorption surface of the magnet are set substantially the same. The insert holder according to claim 1, wherein the suction member includes a suction portion having a suction area larger than an outer dimension of the insert member, and a male screw portion screwed into a female screw formed on the insert member. A method of manufacturing a molded body in which concrete or the like is poured into a space formed by a mold to form a molded body such as a handhole or a manhole, wherein a magnet is attached to a through-hole formed in the mold and the adsorption surface thereof Is inserted and supported so that it is substantially flush with the inner surface of the mold, and a metal adsorption member having substantially the same area as the magnet adsorption area is held by the insert member or formed integrally with the insert member. A method for producing a molded body, comprising: adsorbing the attraction member to the magnet and then pouring concrete or the like into the molded body. 6. The method for manufacturing a molded body according to claim 5, wherein the magnet is supported by a holder removably attached to an outer surface of the mold. The method for manufacturing a molded body according to claim 5, wherein the suction member includes a suction portion having a suction area larger than an outer dimension of the insert member, and a male screw portion screwed into a female screw formed on the insert member.

Images