JPS5910283B2 - Sliding forming device for PC concrete plate - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sliding forming device for PC concrete slabs,
In a concrete plate forming device with ribs in the longitudinal direction, consisting of a long lower frame, PC steel wire fixing, tension device, and sliding upper frame, the structure of the sliding upper frame was simply attached to the form material with legs. By installing vibrating beams that vibrate independently at the front and rear of the underframe, and separately attaching concrete guide vibrating blades and templates to these beams, it is possible to accurately handle hardened concrete with poor fluidity. This made it possible to form the cross section of a concrete slab with ribbed sections.

A method of obtaining a long concrete material with a desired cross-sectional shape by moving it forward while dropping it onto a hard-hardened concrete lower frame is well known.

However, this requires extremely large-scale and expensive equipment.
Not popular.

The present inventor has removed the concrete feeding function from the large-scale sliding part, and has developed a simplified sliding forming device in which the sliding part simply forms the concrete on the lower frame into the desired cross-sectional shape, and has applied for a patent. Zumi (Japanese Unexamined Patent Publication No. 55-41218).

Although it was useful for producing flat PC concrete slabs, it was not suitable for those with ribbed sections.

This appears to be because this simplified forming device cannot perform operations such as dropping concrete in a concentrated manner near the ribs.

However, as a result of research, the problem is not that there is enough concrete at the rib locations, but rather that the concrete itself, which enters under the form that makes up the ribs, has enough vitality to fill every corner of the ribs, that is, the ability to move. I found out that it depends on whether you have it or not.

Furthermore, it is important to note that simply applying vibration from the form to the concrete that has entered beneath the form does not produce such vitality, and that sufficient vitality must be given to the concrete by another, stronger vibration means immediately before the concrete enters the form. The research results were obtained.

This invention embodies the above results.

That is, the sliding upper frame has an underframe consisting of left and right girders and beams that rest on the rails on both sides of the lower frame, and a front and rear frame with a vibrator installed between each of the left and right girders via vibration isolating means. A beam material, a hardened concrete guide vibration vane attached to the front beam material,
It had a unique structure, including a sliding molding molded material attached to the rear beam material.

Next, embodiments of the present invention will be described using the drawings.

FIG. 1 shows a plan view of an embodiment of the sliding forming apparatus of the present invention.

The long lower frame 1 and the PC steel wire tensioning device 2 are unique and were developed by the present inventor earlier, but they were already disclosed in Japanese Patent Application Laid-Open No. 55-42.
Since it is disclosed in Japanese Patent Application No. 805 and is not limited thereto, it will be described briefly.

What characterizes this invention is the sliding upper frame 3 that is placed on the &L lower frame 1 and moves by degrees Celsius.

What is added to the rear of the upper frame 3 by a chain line is a finishing part 3a that finishes the surface of the formed concrete and roughens the surface if necessary, but this is not directly related to this invention, so it will be explained here. omitted.

The cross-sectional shape of the PC concrete slab S, which is the object of this example, is shown in FIG.

This FIG. 2 is a reduced cross-sectional view of FIG. 3 viewed from the right side.

The plane of FIG. 3 is shown in FIG.

FIG. 5 shows an enlarged view of the internal structure of FIG.

First of all, the main parts of the sliding upper frame 3 of this embodiment are as follows: The underframe 30 consists of left and right girders 30a and beams 30b that rest on the rails 4 on both sides of the lower frame. , in this case, beam members 33, 34, 35 with vibrators 32 attached at the front and rear, respectively, provided across the vibration isolating rubber 31;
Hardened concrete guide vibration vane 36 attached to the beam 34 of the front beams 33 and 34 that is closer to the rear beam 35
, 37, 38, 38a, 38b, 38c, and sliding mold plates 39, 40 attached to the rear beam material 35, etc.

In addition, the front beam material 33 is also guided and vibrated in advance to the rib portion S.

The pointed member 41 facing towards the concrete is boxed up, and the front plate 42 of the beam material is used as a retaining plate for stopping excess concrete.

This is not necessary if the hardened concrete dropped onto the lower frame 1 is smoothed, but in many cases this is not the case, so in this embodiment, an auxiliary frame 43 is added to the front of the underframe 30, and a scraper is installed on this. 44 is installed.

Next, the function and structure of the sliding upper frame 3 will be explained in detail.

First, drop it onto the hard concrete bottom frame 1 and level it easily.

The lower frame 1 is often long, reaching 100m, so the upper frame 3
You can place concrete one after another while the work is in progress.

The upper frame 3 may be driven by any means, but it is easiest to pull it with a winch at the tip of the lower frame 1.

Note that if the upper frame 3 is light, it may float, so it is necessary to place heavy objects on it.

When the upper frame 3 begins to slide on the rail 4, the scraper 44 at the front smoothes the concrete over the lower frame 1 to a constant height.

As shown in FIG. 5, the leveled concrete layer is first subjected to the vibration, distribution, and pounding effects of the pointed member 41 attached to the beam 33.

The hardened concrete layer C leveled by the scraper has no fluidity at all, but when it receives the vibration of the pointed member 41, it becomes active and is smoothly distributed to the left and right, increasing the amount of concrete heading toward the lip. .

The concrete that has entered under the pointed member 41 is hammered and tightened between it and the lower frame 1, eliminating any gaps.

Excess concrete is blocked by the retaining plate 42 and continues to stagnate or roll back in front of the retaining plate 42, so the amount of concrete poured into the lower frame 1 can be adjusted by looking at this.

Note that the lower surface of the beam member 33 acts to tighten the concrete passing below due to vibration.

In this embodiment, the cross-sectional shape of the concrete layer C when it passes under the beam material 33 is similar to the cross-sectional shape of the concrete slab S shown in FIG.

The thickness of the part without is thicker.

When the concrete layer C goes under the next beam member 34, concrete activation vibration is finally applied in the main manner.

That is, in this embodiment, a pair of left and right vertical blades 37 are first distributed to the left and right by the pointed member 41, and their tips are widened so as to catch the concrete layer that has passed through the lower surface of the beam member 33 between them.
However, four pairs are arranged in parallel by support plates 45 lowered from the beam members 34.

Each pair corresponds to a lip on the product.

The left and right vertical blades 37 are the lower horizontal blade 38 and the upper horizontal blade 3.
8a, 38b, and 38c, the incoming concrete layer is guided under the next rib template 40, and intense vibration is applied to it.

The vibration must be suitable for the purpose of sufficiently activating the upper layer of concrete forming the ribs and preventing defects from forming on the upper surfaces and corners of the ribs.

Note that below the beam 34, there is a profile 39 attached to the rear beam 35.
The pointed part of is inserted.

Since its lower surface is lower than the lower surface of the pointed member 41 under the beam member 33, the concrete layer is further hammered and tightened, but excess concrete escapes to the left and right, raising the concrete layer toward the rib portion.

Furthermore, since the distance between the left and right vertical plates 370 gradually decreases, the upper surface of the concrete layer that passes between them becomes bulged.

The rear diaphragm 36 applies the final vibration while suppressing this.

Next, a sliding molding material attached to the lower surface of the box-shaped beam member 35 connects the box-shaped part 40 forming the lip part and the longitudinally long part 39 having a pointed end forming a thin part without ribs. This is what I did.

This composite body was created in order to distribute the concrete that has come to the lower part as a sliding form material to the higher part, but if the concrete is distributed 5 times in the first stage, the form material in the final stage will be:
It can also be made into a simple single template.

The side surface of this beam 35 seen from the rear is shown in the above-mentioned FIG. 2, and the shapes 39 and 40 attached every other time to the bottom surface of the beam 35 serve as the upper mold that forms the cross section of the product PC concrete slab S. There is.

In this case, an even larger vibrator 32 is installed to blend the incoming concrete into the mold surface, creating a dense, void-free surface.

The length of the shape material 39.40 in the subordinate direction is determined by the sliding speed of the upper frame 3,
It is calculated based on the vibration time required for the concrete to conform to the mold surface.

One vibrator 32 is installed in the center of each of the beams 33, 34, 35, and the beams 33, 35 have three anti-vibration rubbers 31 on the left and right sides, and the beam 34 has two each.

Since the vibrating body of the beam member 34 is lighter than other vibrating bodies, the vibration effect applied to the concrete is large, but the effect on the underframe girder 30a is comparatively weak.

The capacity, characteristics, and control of the vibrators for each of the beam members 33, 34, and 35 take into consideration complex requirements such as the inertia of the vibrating part, the purpose of the vibration, the properties of concrete, and the sliding speed of the upper frame 3. There is a need for this, and for now we have no choice but to experiment.

However, the tolerance range is wide enough to cause no problems in practice, and unless there are particularly inappropriate settings, a high-quality concrete slab can be obtained without the need for skill.

The PC concrete slab made using this experimental equipment was proven to have excellent bending strength in a strength test at a public testing facility.

Although the above description has been made based on one embodiment, the present invention can be varied and applied in various ways without changing its gist.

For example, the beam member 33 and the lower Ω point member 41 may be omitted entirely, or conversely, the beam member 34 and the blade below it may be omitted, and the beam member 33
The designer's ideas include using the lower surface or the pointed member 41 as a blade, or changing the guide excitation blade to match the shape of the concrete slab, or changing the anti-vibration rubber to a spring. Naturally, it changes depending on the well-known technology.

Note that "PC concrete plate" is a representative product name and does not exclude bar-shaped products from the scope of the invention.

This invention eliminates the sliding molding odor of concrete products by adding vibration to the concrete just before it enters the molding material using guide vibrating vanes other than the molding material, rather than applying vibrations to the molding material, resulting in an extremely large forming effect and quality improvement. It was demonstrated that it can be obtained.

In the specific configuration, beams with vibrators are installed at the front and rear, which are installed between the left and right girders of the sliding platform via vibration isolating means, and vibrating blades and shapes are attached to each beam. Since they vibrate without mutual interference, optimal vibrations can be applied to both the formwork and the blades.

As a result, the hardened concrete on the bottom frame is guided and vibrated in the required direction before entering the formwork, and even the dull vibrations of the formwork are sufficient to reach every corner. It started to spread.

In addition, the anti-vibration means prevents vibrations from being transmitted to the underframe and bottom frame of the sliding upper frame, which prevents deformation of the lower frame, where dimensional accuracy is important, and extends the life of the molded concrete after passing through the upper frame. No deformation or collapse due to

In other words, the present invention has a great effect on technical progress and quality improvement in the sliding molding of PC concrete slabs.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention, FIG. 2 is a side view of the upper sliding frame as seen from the rear, and FIGS. 3 and 4 are elevational and plan views of the upper sliding frame. FIG. 5 is a sectional view taken along line XX in FIG. 4. 3... Sliding upper frame, 30... Underframe, 33, 34.35
... Beam material, 36, 37, 38. 38a, 38b, 38
c...Concrete guide vibration vane, 39.40...
Sliding molding material.

Claims (1)

[Claims] 1. In a concrete plate forming equipment with ribs in the longitudinal force direction, which consists of a long lower frame, PC steel wire fixing, tension device, and sliding upper frame, the upper frame is placed on the left and right sides that rest on the rails on both sides of the lower frame. An underframe consisting of girders and beams, front and rear beams with vibrators installed between each of the left and right girders via anti-vibration means, and hardened concrete attached to the front beams. A sliding forming device for a PC concrete slab, comprising a guide vibrating blade and a sliding forming mold material attached to the rear beam material.