JPH065124Y2 - Core fixing device for concrete molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a core fixing device for concrete molding.

(Prior Art) It is well known to use a core for molding concrete. During this type of molding, for example, when manufacturing a concrete product such as a rainwater basin, a non-penetrating or penetrating recess is formed by molding to connect a water distribution groove, a water distribution pipe, or the like to the basin (No. 9). See figure). Since the diameter and the position of such a recessed portion differ depending on the product, the core for molding the same is also attached to a required position of a specific mold every time the molding is performed.

Conventionally, the core has been fixed to the surface of the mold by means such as welding or bolting, and it has to be peeled off when it is replaced at another position. Therefore, the formwork is damaged quickly and the workability is not good. Also, in the case of a core that is used only once, a core may be made of Styrofoam, but in order to securely fix this to the formwork, it is necessary to weld fixing rods for that purpose to the formwork. , It is the same to damage the formwork.

(Technical problem) The present invention has been made to solve the above-mentioned problems and the like. The problem is that the concrete molding core is very easily attached to and detached from the mold, has durability, and has a predetermined position. It is to be attached accurately to the mold so that there is no risk of damaging the formwork.

(Technical Means) In order to solve the above problems, the present invention relates to a non-penetrating or penetrating form in which concrete is filled by filling a space surrounded by a formwork with concrete and attaching B to the formwork when molding. As a device for fixing the core for forming the indented part A, the outside facing the mold B has an outer shape of substantially the same shape as the indented part A having a tapered cross section larger than the inside, A hollow core main body 1 having an end face 11 on the facing side and an opening on the other end face 12 and an end face 21 on the side which is contained in the main body and is in contact with the mold B are open. And a hollow fixing member 2 which is closed around and is detachably engaged with the core body 1 on the mold B side, and the fixing member 2 which is in contact with the mold B to seal the inside of the fixing member 2. A sealing means 3 attached along an end face 21 of the member 2 facing the form B; In which it took measures that constitute a valve means 5 which keeps the negative pressure outlet port 4 and the fixed internal member closing the exhaust port for discharging the air in the member.

(Example) Explaining below with reference to the drawings, an exemplary core device is used for molding a concrete product C as shown in FIG. 9, and the product C has a non-penetrating shape on its side surface. have the invagination a ₁ or through shaped dimple a _2, core device of the present invention for the simultaneous molding of the two recessed portions a _1, a ₂ during product molding is used with products molding frame.

The core body 1 is formed in a hollow shape having an outer shape corresponding to the above-mentioned shape of the non-penetrating indented portion A ₁ , that is, a tapered cross section in which the outer side is larger than the inner side. The end face 11 of the large area of the side in contact with the mold B for molding the recessed portions A ₁ of the core body 1
Is open over the entire surface, and the end surface 12 on the opposite side to the small area is an opening for attaching and detaching the fixing member 2. Both end surfaces 11, 12
Are substantially parallel to each other, and an engaging edge 13 is provided in the middle of them substantially parallel to the surfaces 11 and 12.

The fixing member 2 is a member that fixes the core body 1 to the form B. Form B for fixing the core body 1, that is, the recess A
The end surface 21 of the fixing member 2 which is in contact with the mold B for molding ₁ (or A ₂ ) is entirely opened, and the end surface on the opposite side is an end plate 22.
The end plate 22 is entirely closed by an engaging flange 23 that engages with the engaging edge 13 on the main body side in the direction of the mold B. The engagement edge 13 and the engagement collar 23 constitute an engagement means 6 for the main body 1 and the fixing member 2.

The mold-side end surface 21 of the fixed member 2 together with the main body end surface 11 forms the mold B in a state where the member 2 is engaged with the main body 1 by the engaging means 6.
The length is set so as to come into contact with or slightly float from the surface of the mold B, and the mounting groove 31 of the sealing means 3 is provided on the entire circumference of the end surface 21 (FIGS. 2 and 3). The mounting groove 31 shown in FIGS. 1 and 2 is an example in which a groove member 32 having a substantially L-shaped cross section is provided on the inner circumference of the end face. The mounting groove 31 shown in FIG. 3 has a substantially U-shaped groove member 33 facing downward. The example is shown in FIG.

The sealing means 3 is in close contact with the mold B and seals the inside of the fixing member 2. Therefore, the sealing means 3 is made of a flexible material such as rubber or synthetic resin and is endless. The means 3 is a normal O
-A contact surface 34, which may be a substantially circular cross-section such as a ring
It is more effective to use a rectangular cross section having a wide cross section, or a substantially U-shaped cross section having double lips 35, 35.

The exhaust port 4 is provided in the end plate 22 for sucking and discharging air from the inside of the fixed member 2, and a connector type having the valve means 5 integrally can be used. 41 indicates a hose connection at the outer end of the exhaust port. The valve means 5 closes the exhaust port 4 and keeps the inside of the fixed member 2 at a negative pressure. The valve means 5 exemplified in FIG.
This is an example having a movable valve plate 52 that comes into contact with and separates from a valve seat 51 provided in the exhaust port, and opens when sucking to a negative pressure, but automatically closes by the internal negative pressure when the suction is stopped. Reference numeral 53 is a valve plate mounting shaft, but when the valve plate is formed of a flexible piece, it is only necessary to fix the end portion. The valve means 5 illustrated in FIG. 5 opens and closes the ventilation by rotating the valve hole 56 of the ball valve 55 provided on the valve shaft 54, and the knob 57 is manually operated. As the valve means 5, in addition to those exemplified above, a commercially available check valve is used.

The seal member 7 can also be attached to the mold frame side end surface 11 of the core body 1 (see FIG. 6). This seal member 7
Is the prevention of mortar intrusion rather than air leakage. The opening of the end face 12 on the opposite side of the core body 1 is closed by a cover lid 8 fitted to it (Fig. 1).

The above-mentioned negative pressure holding means may be used when forming the penetrating recess A ₂ , but the inner end surface 12 of the core body 1 is attached to the inner frame B ′ of the inner and outer frames B and B ′. A support structure can also be used together. In that case, the core body 1 is provided with an inner form B '.
An auxiliary member 1'extending to is used. The member 1 ′ is connected to the main body 1 by a connecting piece 9. The extension means by such connecting piece 9 can also be combined with the above-mentioned core device.

(Operation) Next, the operation of the present invention will be described along with the steps. First, the core body 1 is arranged so that the end surface 11 is in contact with a specific mold B (eighth embodiment).
(A)), and the fixing member 2 is accommodated therein ((b)). In this state, the fixing member 2 engages with the core body 1 at the inner peripheral edge.

A vacuum pump is connected to the exhaust port 4 of the fixing member 2 sealed by the sealing means 3 via a hose H to make the inside of the fixing member negative (FIG. 7 (c)). Next, the valve means 5 is operated and closed, and the hose H is removed. However, since the main body 1 and the seal member 3 are in pressure contact with the form B by the negative pressure, the engaging means 6
Thus, the core body 1 is firmly fixed to the form B and does not fall off by an external force at the time of filling the concrete (FIG. 7 (d)).

After that, the other end surface 12 of the core body is covered and closed by the lid 8, and another mold B'is set. Of course, another form B'may be set in advance at the same time as the other form.

After completing the setting of the core device, the form B shown in FIG.
Concrete M is filled between B'and cured as it is. Once the concrete M is in the hardened state, the core body 1 and the like need no longer be adsorbed to the form B. Therefore, the sealing means only needs to be able to reliably maintain the adsorption performance from the core setting to the concrete hardening, and it is not necessary to maintain a high negative pressure until the mold is removed. Thus, when the molding is completed, the molds and the core of the present invention are removed from the product C, and the cover 8 is also removed to form the recesses A ₁ and A ₂ .

(Effect) Therefore, according to the present invention, since the core is fixed to the mold B by the negative pressure, there is no possibility of damaging the mold, and the durability time of the mold can be remarkably extended, and at the same time, the mold B It can be mounted and removed very easily, and especially after the solidification after the solidification, it is indispensable to have a core having an outer shape substantially the same as that of the indented portion A having a tapered cross section with a larger outer side than the inner side. It can be removed, that is, the condition as the core can be satisfied, and the core fixing member 2
In contrast to the small sealing means 3 provided within the end faces 11 and 21 of the opening of 7, the sufficient suction holding force can be obtained, and the main body must have a sturdy structure in consideration of removing the core. It becomes possible to manufacture a fixing member that does not require the cost at a low cost, and it is advantageous in that the entire member does not need to be replaced even if a defect occurs on the seal side.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional view, FIG. 2 and FIG. 3 are sectional views showing two forms of sealing means, and FIGS. 4 and 5 are 2 of valve means. Sectional view showing a form, FIG. 6 is a sectional view of a modified example, FIG. 7 is a sectional view of an extension means, and FIGS. 8 (a) to 8 (e) are explanatory views showing a concrete forming step by the device of the present invention, and FIG. The figure is a perspective view for explaining a concrete product, and FIG. 10 is a cross-sectional view showing the relationship with the formwork. 1 ... core body, 2 ... fixing member, 3 ... sealing means,
4 ... Exhaust port, 5 ... Valve means, 6 ... Engaging means, 7 ...
Seal member, 8 ... Cover lid, A, A ₁ , A ₂ ... Indented part,
B: Formwork.

Claims (2)

[Scope of utility model registration request] 1. When filling a space surrounded by a formwork with concrete and forming the mold, a non-penetrating or penetrating indented part A which is attached to the formwork B and is not filled with concrete is formed. A device for fixing a child, which has an outer shape that is substantially the same as an indentation A having a tapered cross-sectional shape in which the outside facing the mold B is larger than the inside, and the end face 11 on the side facing the mold B is opened. However, a hollow core body 1 having an opening at the other end face 12 as well.
And an end face on the side that is contained in the main body and is in contact with the mold B
A hollow fixing member 2 having an opening 21 and having the other surface and the periphery closed, which is detachably engaged with the core body 1 toward the form B side.
A sealing means 3 attached along the end face 21 of the fixing member 2 facing the mold B in order to seal the inside of the fixing member 2 in contact with the mold B; A concrete molding core fixing device comprising an exhaust port (4) for exhausting air in the member and a valve means (5) for closing the exhaust port and maintaining a negative pressure in the fixing member. 2. The core body 1 has an engagement edge 13 on the inside, and the fixing member 2 has an engagement flange 23 on the outside, and the core body is formed by the engagement of the flange 23 and the engagement edge 13. The concrete molding core fixing device according to claim 1, wherein 1 is fixed to the form B by a fixing member 2.