JPS5910622A - Manufacture of concrete foundation structure - Google Patents

Abstract

PURPOSE:To simplify operation processes on site by a method in which a caged frame is produced, the periphery of the caged frame is covered with a net, and concrete is placed into the caged frame. CONSTITUTION:In the manufacture of a concrete foundation structure for fixing the legs of a high-tension power transmission line tower, for example, a hole 2 is drilled, a supporting beam 3 for the steel tower is set at a given height by using cobble stones 4 or concrete blocks 5, the legs 1 of the steel tower are attached to the beam 3 and fixed with a temporary strut 6. A leveling concrete 7 is placed to a depth at which the beam 3 is buried adn hardened, and four one-split rings 8 are fixed to the periphery of the legs 1 of the steel tower through the temporary strut 6. Furthermore, 12 steel pipes 9 are fixed at equal intervals along the periphery of four rings 8 to complete a caged frame, as shown by Fig. The whole side of the caged frame is covered with a net 11 to form a tight net covering, and concrete is placed into the upper opening of the caged frame.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing concrete foundation structures such as structures for fixing the legs of commercial power transmission towers.

Conventionally, methods for manufacturing concrete structures that have been commonly used include wood panels as formwork for concrete;
The method used is to assemble unit formwork of iron fist or synthetic resin into the desired shape and then pour concrete into the formwork, but the drawback is that it is difficult to assemble and remove these formworks at the construction site. requires a great deal of effort,
In order to create the formwork, it is necessary to transport a large amount of material to the construction site, which increases transportation costs, and requires skilled workers to create and assemble formwork with more complex shapes. There were problems that required .

In particular, construction work for installing or renovating power transmission line towers that transport electricity is more often carried out in mountainous areas than in flat areas, and in particular, construction work for high-voltage power transmission line towers is extremely common in remote mountainous areas. Therefore, in the construction work, it is extremely difficult to transport the necessary materials, and since transport from the ground is usually difficult, the current situation is that material transport relies on intra-wall transport such as helicopters. In addition, the construction of these steel towers is the same as that on flat land, starting with material transportation, excavating the ground, pouring concrete, forming formwork with complex shapes, pouring concrete, removing formwork, backfilling, and removing the recovered formwork. A great deal of labor and time is also required for transportation to the construction area for the first stage of maintenance.

The inventors of the present invention conducted various studies to solve the four problems of the second conventional method, and as a result, they created a brush-shaped frame and then wrapped the film around the outer circumference of the frame many times (generally about 10 times). , invented a simple method of pouring concrete (1980-521429, 1982-39).
Some of the methods of No. 266 and Tokuyuki are being put into practical use.

In the first step, the workability of wrapping the film around the foil frame several times, which is difficult to do for a long time because the footing for work is often not good, is avoided.
Wrapped films and lumes are also prone to tearing, and when concrete is poured, the lower the film tends to slide upward due to the lateral pressure due to its weight, so to prevent such defects, on-site work must be carried out. The reality is that the process has not been reduced as much as initially expected.

The problem of messing up the film wrapped around the %.

There is also the problem of upward shearing of the lower film due to the heavy concrete bearing pressure during concrete pouring.

This must be avoided as it may lead to leakage of poured concrete. Such problems arise in the case of structures for fixing the legs of high-voltage transmission line towers, etc., where the structure is in the shape of a cone with several heads or a polygonal pyramid with several heads, making it easy for the film to bend and slip. Furthermore, since the structure is inclined at an angle of about 10 degrees with respect to the horizontal line, the pressure of the nails of the poured concrete is concentrated in one part, making it easy for the lower film to slide upward.
This was an important issue.

The method of manufacturing a concrete foundation structure of the present invention solves the above-mentioned problems of the conventional method.

The manufacturing method of the present invention is to make a brush-shaped frame, cover the outer shell of the frame with a rope, and pour concrete into the frame. ＃This is the manufacturing method of Senzomono.

The brush-shaped frame of the present invention is formed into a brush-like shape by using a material having an arbitrary shape such as a rod, a line, a sparrow, or a plate. Similarly, Figure 3 shows a stake-shaped frame used for the foundation structure for fixing the legs of a high-pressure transmission 11L line steel tower.

In other words, if concrete is placed inside the brush-shaped frame after its entire circumference is covered with rope, until the concrete hardens,
Any material may be used as long as it has sufficient strength to maintain the constant Ff+ shape. In terms of strength and cost, it is generally preferable to use iron as the material for the elongated frame, but the material is not limited to iron.

The rope used in the present invention is a rope that covers the outer periphery of the brush-like shape and, when a comfleet track is placed inside, there is virtually no leakage of concrete, and the rope does not expand or break due to the lateral pressure of the weight of the concrete. If so, any type of rope can be used without restriction. Such a rope has a mesh opening of about 0.5 to 25 mm, preferably about 1 to 1 mm.
0 m+c, most preferably about 2-5 m+m silk is used. If the opening is too small (less than 0.5 mm), water will be difficult to drain through the entire rope, which is undesirable.
On the other hand, if it is too large, exceeding 25 mm, concrete will leak more frequently during pouring, which is not preferable.

In addition, in the rope used in the present invention, the elasticity of the silk thread forming the rope is preferably 50% or less, f″i, 40% or more, and I
7. If the groaning rate exceeds 50%, it's too loud.

This is undesirable because it is easily deformed by lateral pressure during pouring, making it difficult to achieve dimensional accuracy of the structure. As for the quality of silk thread, synthetic resins such as polyester, nylon, acrylic, vinylon, polypropylene, and polyethylene, or natural fibers such as hemp and cotton are used. A composite silk thread having a synthetic fiber such as polyester and a thermoplastic resin coating layer such as vinyl chloride is preferably used.

Moreover, a wire mesh plate can also be suitably used.

In this specification, the elasticity of silk thread refers to JIS z, t.

69, the value measured as follows. A piece of paper with a width of 5 long and a length of 30 long is loosely stretched with silk thread at a distance of 9 and 20 long, and both ends are fixed with adhesive.

A test piece was prepared, and the elongation at length and cutting was measured using a constant speed tension type single fiber tensile tester at a tensile speed of 20 mm/min.
) All measurements were taken and the success rate was calculated using the linear equation.

However, E: Looseness (tomo) E2: Elongation upon cutting (dragon) In the present invention, the term "silk thread" refers to monofilament (fiber).
, is used to collectively refer to all linear materials of various thicknesses that form ropes such as yarns, strings, and wires. The thickness of each tightening thread is preferably 05 to 2w1I11. Most preferably, those having an f'i of 0.5 to 1 are used.

Any method can be used to insert the cylindrical frame with a rope, as long as the entire side surface of the cylindrical frame is wrapped tightly with silk, but it is preferably 2 to 5 m (13 mm). Cut the rope 1 in advance into a shape with a slight overlap added to the developed figure on the side of the @ shape, wrap it around a cylindrical frame, and tie the irradiation allowance to the first layer of rope with wire etc. to fix it. If necessary, the whole surface of the covered rope should be 20 to 40 cm long.
It may be further bound with polypropylene bands or the like at intervals of m.

The details of the present invention will be explained below according to examples with reference to FIGS. 1 to 5. When manufacturing a concrete foundation structure for fixing the legs of a high-voltage power transmission line tower (height 3.6 m, upper diameter 0.7 mφ, lower diameter 1.28 mφ) according to the present invention, the first step is as shown in Fig. 1. Dig a hole 2 4.1 m deep to bury the 5.5 m long tower leg 1. Next, the cross-shaped steel tower supporting material cat 3 is pierced with chestnut stones 4 and concrete blocks 5 to a predetermined height, and then the steel tower legs l are completely laid down on top of the cat 3 so that the legs are horizontal to the predetermined height. The legs of the steel tower are accurately fixed with temporary support columns 6 so that the inclination angle is 10°.

Next, the concrete 7 is dumped to a depth where the cat 3 is buried, and the concrete 7 is allowed to stand for more than a day to harden.

Next, as shown in Figure 2 (perspective view), 4
Attach the split ring 8 (ljJ3cm thickness 2.5 dragon steel gundo) to the temporary support post 6 and attach it to the steel column leg l.
Fixed to. Once that is finished, 4 minutes of Tetsunoya Eve 9
Twelve rings are fixed at equal intervals along the outer periphery of the four rings, and the throat-shaped frame f as shown in Figure 3 (schematic diagram) is completed. At this time, two tsuba 10 were installed near the bottom end of each iron/pipe 9 as shown in Fig. 4 in order to have a slippery machine h1 sink to prevent the rope from slipping 11-. .

On the side of the cylindrical frame completed in this way, a mark of 11
1! Wrap the cut rope 11 in the shape of the expanded view of 1 and add m lenght, and connect the 5 rope and wire appropriately at the 5 overlap part to make the entire side of the tactile part. A tight rope covering was formed as shown in Figure 5.The system used was a fusion net of PVC-covered polyester, and the thickness of the silk thread was approximately 1 m.
, an openness ratio of 30%, an opening of about 2 m, a weight of 0, tskg/go, and a void ratio of 47%.

The turtle-like appearance created in this way may be covered with concrete from part of the frontage.

In this example, in order to improve the external shape of the structure that appears above the ground, a PEP formwork 12 having the same slope as the formwork is further covered over the rope cover only on the upper part of the frame that appears above the ground, and then quickly Hardening concrete was poured. At the time of concrete pouring, approximately 50σ of water had accumulated in hole 2 due to recent rainfall.

There was almost no leakage from the concrete through the rope. In addition, it was possible to directly judge the filling status during concrete placement with the naked eye or feel through the mesh.

After the concrete had sufficiently hardened, the upper FRP form metal removal hole 2 was backfilled to form a concrete foundation structure. The obtained structure was in no way inferior to structures obtained using conventional construction methods.

As is clear from the above examples, the method for manufacturing concrete foundation structures of the present invention uses only materials that are easy to transport, and forms can be easily assembled even in dusty construction sites with poor footing. There is no need to wind the film multiple times as in No. 52429, so there is no additional work time required, and there is no need to use expensive film, so the cost is 1-1. It has a long h rTh such as saving. In addition, with the present invention, the rope L is suspended once when concrete is poured.
It has the benefit of being able to directly inspect the installation status and making wholesale inspections easier. Furthermore, it is presumed that the large length r9r of the present invention is based on the fact that underwater casting can be advantageously carried out, and the water content in the concrete can be effectively spread as the concrete progresses through the wire.

[Brief explanation of the drawing]

Figures 1 to 5 show an example of the manufacturing method of the present invention for making a concrete structure for fixing the legs of a high-voltage power transmission tower. FIG. 3 is a cross-sectional view showing a situation in which it is fixed at an inclination angle. Figure 2 shows the tower leg l.
This is a perspective view of a situation in which a brush-shaped frame ligature is being made with eight rings attached to the center without water permeability. Figure 3 is a schematic perspective view of the completed boat. FIG. 4 is an enlarged perspective view that does not show the six-digit collar 10, which is used to prevent the lower V of the frame from rising. Fig. 5 Vi The formwork 11 of the concrete pouring surface MiJ, which is covered with silk 11 and further provided with the FRP formwork 12 on the top.
This is a diagram. (3 others) Procedural amendment (voluntary) August 17, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 11iVPlnoit 1980, nken No. 117667 2 Name of the invention IJ - How to use #3 for basic structures 3 Famous events of playing Tsumugi 11 (Relation to 1) Patent applicant 111Sir - 4th generation, 3-1, Shiratama-chome, Maruno, Chiyoda-ku, Kyoto, 10th floor, 1st place 1-9-15 Akasaka, Minato-ku, Tokyo Attachment (1) The statement in the scope of claims column with a small specification is corrected as follows: r [(P♀rF Claims)] 1. Brush-shaped frame metal making , concrete IJ, which is characterized by covering the outer periphery of the mounting frame with a net and pouring concrete into it.
- Method for manufacturing basic F4 structures. 2 Patent jf where the mesh opening is approximately 05 to 25 m! The manufacturing method described in Paragraph 1 of the ``Soul of Hope''. 3. The manufacturing method according to claim 1 or 2, wherein the elongation rate of the silk thread to be formed is 50% or more. 4. The manufacturing method described in any one of claims 1 to 3, in which the silk thread is a synthetic resin net thread. 6. When the foundation structure is made of conocrete based on the legs of a high-voltage power transmission tower, Range 1st term ~・A5 D,) Middle range binding method.'' (2)
Ming 111 book 10 Tei π9 Bamboo, FJ”, 6
Page 1st line, 7th line, 10th line, 11th line to I arm, 12th line and 14th line, 7th page 12th line, 8th day, 9111, 1st
4th line and 15th Igo, 9th autobiography l 7th, 1st
3rd line and 4) 5th I, page 10, 1st Oi ■ and single 1
5th row, the 1st row of the 11th grade student and the 12th row of the 13th student, g.
Toai)? i-1 "net", nl', +E-f stone (31, page 7, line 3, line 6, 12th, 14th i)
16th and 1st. , f48 self-written line 8 and line 1I, l-kun 11
Self・Iris 2i ■vc, J rope thread] is llt into ``net thread''. (4) 3 lines from the 6th C, page 11, appendix 13, 14th, 1st page, 12th line, 13th, 14th, and 16th line, "64" correct. (5) In the same 7th car, 13th I, [all ropes $21] was changed to ``
@J', iE on the wire mesh board. (6) Does it say "Tsunahajo" on the last line of page 10 and the 9th line of the 11th direction? , corrected to ``net assistance''.

Claims (1)

[Claims] 1. Make a southern frame and cover the outer periphery of the frame with rope. A method for manufacturing a concrete IJ-contact foundation structure, characterized by pouring concrete (1) therein. 2. The manufacturing method according to claim 1, wherein the rope has a mesh opening of about 0.5 to 25 mm. 3. The manufacturing method according to claim 1 or 2, wherein the silk thread forming the rope has a writhing ratio of 50% or less. 4. The manufacturing method according to claims 1 to 3, wherein the silk thread is a synthetic resin silk thread. 5 Claims 1 to 4 that are performed by underwater casting
The manufacturing method described in any of the paragraphs. 6. The foundation structure is concrete I for fixing the legs of high-voltage transmission line towers.
J-Claims 1 to 5 which are foundation structures
Manufacturing method described in section.