JPH01196307A - Hollow concrete inner frame with flexible section and its releasing method - Google Patents

Abstract

PURPOSE:To prevent concrete from getting in and enhance the efficiency of assembly and cleaning by connecting flexible materials with steel plates on both sides of cut away sections without any differences in level and forming an integrated inner frame without any cut away sections on a concrete contact surface. CONSTITUTION:Flexible rubber 5 is connected with an inner frame 2 by means of a connecting link bracket 8'. When the link 8 is moved in the up and down direction by the revolution of a driving rod 9, the connecting link 8 is linked following the movement of the flexible rubber 5 to shrink the inner frame main body 2 and separate from a concrete bonded surface, as an inner frame reinforcing rib 3 and flexible rubber 5 are engaged each other by means of a connecting link 8 through a connecting link bracket 8'. In case of assembly, the flexible rubber 5 returns to an upper end regular position of the inner frame main body 2 by revolving the revolving driving rod 9 in the reverse direction. Concrete shows no grout leaks when poured, and time required for cleaning and assembly of the frame 2 can be shortened to a substantial extent, while a product with no marks on its surface can be molded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention reduces the inner formwork, which cannot be opened to the outside like the outer formwork, inward, thereby separating the contact surface from the concrete and separating the inner formwork from the concrete product. 0 Regarding hollow concrete block formwork for forming concrete products whose formwork can be easily demolded <Prior art> When manufacturing concrete products by placing an inner formwork for space inside the formwork, it is necessary to divide the formwork. Assembling and removing the mold is carried out by expanding and contracting the inner formwork having a section and moving the removable wall inserted into the divided section close to each other.<Problems to be solved by the invention> The conventional inner formwork is divided. The divided part of the inner form and the removable wall are repeatedly pulled inward to create a large amount of relaxation between the molded product and the inner form, and then the molded product is removed from the inner form. Is the degree of adhesion deformed? 17100 residue reduces the degree of adhesion, and during concrete pouring, concrete seeps through the joints of the divided parts and solidifies after curing, greatly hindering the efficiency of formwork assembly and cleaning work.

In addition, marks were created at the joints on the product surface, which required work to be removed.Means for Solving the Problems> Therefore, the present invention provides a flexible material for the steel plates on both sides of the internal form dividing part. By connecting without any steps, the concrete contact surface of the inner formwork becomes an integral inner formwork with no separated parts, and when demolding the formwork 2 and assembling, the flexible part is bent to shape the demolding margin of the product, and the molding Occasionally, the dimensions were returned to standard, creating a formwork with no seams.

Effect〉 Concrete the inner formwork placed inside the outer formwork.

When releasing the mold from the casting surface, the flexible part connected to the inner mold is bent inward around its longitudinal direction to release the product, and when molding, the VC is flexible to the normal position. This is to restore the department.

<Example> Fig. 1 is a partially cross-sectional side view of a hollow concrete form showing the present invention, Fig. 2 is a partially cross-sectional side view of the inner form, Fig. 3,
FIG. 4 is a front view showing the differential movement and expansion and contraction of the inner formwork.

Figures 6 and 7 are diagrams showing the expansion and contraction situation using the bellows method.
Figures 11 and 12 show the expansion and contraction situation when a shape memory alloy is connected to a flexible rubber plate. 1 is the outer formwork and the lower part V of the outer formwork.
CIIIiT No. 18 is installed, and the outer formwork l and end plate 4 are connected by hinges at the bottom of the formwork.

Reference numeral 2 denotes the inner formwork body, and 5 is joined to a connecting link bracket 8' with flexible rubber.

Reference numeral 9 denotes a rotary drive rod for reducing and enlarging the inner formwork body, and by aligning the handle 16 with the handle 16, the formwork can be disassembled and reassembled.

The reduction/enlargement mechanism is such that when the link 8 moves vertically due to the rotation of the drive rod 9, the inner formwork reinforcing lip 3 and the flexible rubber 5 are engaged with the link 8 via the link bracket 8'. As the flexible rubber moves, the connecting links 8 move in conjunction with each other, so that the inner form body 2 is contracted and separated from the concrete contact surface.

When assembling, by rotating the rotary drive rod in the opposite direction, the flexible rubber returns to its normal position at the upper end of the inner form body, as shown in FIG.

Next, the assembly and demolding state of the #containing block product in which the flexible rubber plate is joined to the divided portion B will be explained with reference to the drawings.

The embodiment shown in FIGS. 1 to 4 is an example in which the flexible portion is contracted or expanded by connecting/connecting with a telescopic link connected to the inner frame using rubber. First of all, when removing the product from the mold after curing and hardening, the assembly bolts 14 are first removed.
is loosened, and the four plates 4 are separated from the end contact surfaces of the respective outer forms l by means of the hinges 18.

Next, in order to pull out the inner formwork body 2, when the handle 16 is fitted onto the drive rod 9 and turned to the right, the nut members 10 fitted on the left and right screws move in the direction of the arrow, and the telescopic links 7 move in the direction of the arrow. When it is moved, since the flexible rubber plate 5 is joined to the connecting link bracket 8', it moves gradually from the upper end of the inner formwork toward the position shown in FIG. 4.

7, the peripheral wall 2' separates from the concrete surface and breaks from the bent portion as the movable pin moves along the elongated hole 11 in synchronization with the lowering of the rubber plate by the connecting link 8.

This will shrink the inner formwork body, so the insertion hole 1 for demolding
In step 5, remove the inner formwork body from the cylindrical concrete product by inserting a take-out hawk.

Next, both sides of the outer formwork 1 are opened outward, and a vacuum bat (not shown) is applied to the back of the product to remove it from the mold upward.

After moving the product, apply a release agent to the cleaned outer formwork and the bottom of the formwork.

On the other hand, the inner form body 2, which has been cleaned and coated with a release agent, is moved above the outer form 1, reinforcing reinforcing bars are inserted into the inner form body, and then placed on the inner form fixing base 17.

Next, pull both main plates and the outer formwork to their respective predetermined positions, tighten the formwork assembly bolts 14, and then place the handle on the inner formwork drive rod 9 and turn it in the opposite direction to the direction used when demolding to make it flexible. The rubber plate and the peripheral wall move upward and return to the normal position shown in FIG.

After assembly is completed, the concrete is moved to the Funkrete feeding machine, where concrete is again poured from the top, the top surface of the product is finished after vibration filling, and then moved to the curing room where the concrete is cured before being moved to the product demolding area again. .

Figure 5 shows an example in which a sill is used as the inner formwork and the hollow body is filled with a fluid substance.A bellows 19 is connected to the peripheral wall copper plate at the inner formwork dividing part B of the box culvert, and the fluid substance is filled in the hollow part. Filling and pouring concrete, and when removing the mold, discharge the fluid substance and then bend/fold 27 bending cylinder 2
8, and in conjunction with this, pull the side plate of the inner form and move it as shown in the imaginary line in Figure 5 with a sillage of 26 VC to form a demolding allowance on the concrete molding surface and the inner form 2, and the product is manufactured. The inner formwork 2 is removed from the mold, and the hollow f of the bellows 19 is differentially operated in the opposite direction during molding. This is an example in which concrete is poured again after filling with 1SVc fluid.

The embodiments shown in FIGS. 8 and 9 are examples in which the tension fitting 31 is embedded in a flexible rubber plate, and in which the backing reinforcing plate and the rubber plate are integrated into one rubber plate.

Figure 10 shows an example in which shape memory alloy 33 is bonded to a flexible material such as rubber, or mixed into a sandwich or flexible material.0 Figures 13 and 14 show a hollow body. This is an embodiment in which the lower surface of the flexible rubber is filled with a solid substance and receives the load and vibration received during casting by interlocking the pedestal 32.

In the embodiment shown in Figs. 15 and 16, the space between the inner forms is relaxed by filling and discharging liquid etc. into a hollow body that is connected to the inner form without any difference in level without expanding or contracting the inner form using a connecting link 8 or the like. This is a method of demolding the inner formwork from the product by causing the inner formwork to be removed from the product, and is particularly convenient for small dark products that do not take up much space inside.

Assembling and demolding of a small number of embodiments have been explained above using drawings, but the main point of the present invention is to integrate the inner form by joining a flexible material that can bend freely to the divided part of the inner form. By squeezing, a margin was created for the concrete to be removed from the mold.

In addition, in order to make it easier to bend, the canvas 23Vc mounting plate 20 and the ribs 21 are provided with a hollow body, and the outlet 22 of the canvas 23Vc is expanded and contracted by filling and discharging liquid or gas. It can be applied in various ways depending on the shape of the formwork while maintaining its functionality.

<Effects of the Invention> The present invention has the advantage that the elasticity of the flexible plate makes it possible to
- The product can be demolded by shrinking the inner formwork without a removable wall, such as a product with a removable wall, inward to form a demolding margin, so there is no need to separate the removable wall from the inner formwork as in the conventional method. There is no need to do so.

Therefore, even when filled with fluid concrete, there is no leakage, the cleaning time of the formwork and assembly work can be greatly shortened, and the product has no scratches on the surface. It can be molded.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional side view of a formwork showing an embodiment of the present invention;
FIG. 2 is a partially cross-sectional side view of the inner form, and FIGS. 3 and 4 are front views showing the differential movement of the inner form and the expansion and contraction of the flexible plate. Figure 5 shows an example of a large product, Figures 6 and 7 show the bellows method, Figures 8, 9, and 10 show examples of each flexible plate, and Figure 11 shows an example of the flexible plate. , FIG. 12 shows an example in which the reinforcing plate is made of a shape memory alloy, and FIGS. 13 and 14 show examples in which the hollow body is filled with solid. Figures 15 and 16 are examples of demolding methods using liquid;
Figure 7 is a perspective view of the underdrain product. A...Formwork, B...Dividing section, 2...
...Inner formwork, 5...Flexible rubber, 9'...
...screw bearing, 12...stop pin, 13...
...Moving bin, 24...Molding surface, 25...
...Joint bolt, 29...Joint, 30...
...Liquid, 40...Flexible part, 50...
product. Patent applicant Chiyoda Giken Kogyo Co., Ltd. shit,. and / '+141゛ko, iυ 11ra'2170

Claims (8)

[Claims] (1) Part of the cylindrical peripheral wall of the inner formwork 2 consists of an inner formwork with a divided part over its entire length and an outer formwork 1 forming the outside of the product, and the inner formwork is reduced inward to create a concrete product. In the inner formwork of the hollow concrete product to be demolded, by means of expanding and contracting the inner formwork by connecting the flexible part to the steel plate of the inner formwork forming surface adjacent to both sides of the inner formwork peripheral wall of the divided part without a step difference. An inner formwork for hollow concrete having a flexible part, which is characterized by reducing the size of the flexible part to obtain a clearance for demolding. (2) Shrinking by a telescoping mechanism that connects the flexible part to the inner formwork;
An inner formwork for hollow concrete having a flexible portion according to claim 1, wherein the inner formwork is enlarged. (3) The inner formwork for hollow concrete having a flexible portion according to claim 2, wherein the flexible portion is a rubber plate. (4) Claim 3, wherein the rubber plate is composited with a shape memory alloy.
Hollow concrete inner formwork with flexible parts as described. (5) The inner formwork for hollow concrete having a flexible portion according to claim 1, wherein the flexible portion is hollow and filled with liquid, gas, or solid. (6) An inner formwork for hollow concrete having a flexible portion according to claim 5, wherein the substance filled in the hollow body is a liquid or gas. (7) The inner formwork for hollow concrete having a flexible portion according to claim 5, wherein the substance filled in the hollow body is solid. (8) Claim 5 characterized in that the inner form is removed from the concrete by discharging the liquid or gas filled in the hollow body of the flexible portion to create relaxation between the molding surface and the inner form. Demolding method of the inner formwork described.