JPS582312B2 - Chiyoukouenttsunonite Usekouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of installing an inner cylinder made of a steel plate by jacking it up inside the outer cylinder of a chimney made of reinforced concrete.

Wire set, rod type, push-up type, etc. are already known for constructing the inner tube into the outer cylinder.

For a set of wires, the wires are hung on many pulleys and hoisted up with a winch, so long wires are required and the winch is also large.

In addition, with the rod type, the jack rises on top of the hanging rod, requiring a long rod, and there were also problems with the rod joints.

Furthermore, the push-up type had the disadvantage that the jack-up device was placed on the ground, which increased the size and cost of the equipment.

This invention uses smaller-scale equipment than the conventional method,
A new construction method that allows the inner cylinder to be lifted to the top of the outer cylinder, and can be done using the required number of jacks and lifting wires, regardless of the height of the chimney. It is constructed by joining a large number of segments made of steel plates, and these segments are joined while being lifted inside the outer cylinder to form ten-and-a-half parts of the inner case, and then the upper half is moved all at once to the top of the outer cylinder. The present invention provides a construction method in which a lower half is formed on the lower side of the upper half by lifting it up, and the lower half is joined to the upper half to complete an inner cylinder extending from the top of the outer cylinder to the bottom. .

The present invention will be explained in detail below using illustrated examples.

1 is the reinforced concrete outer cylinder of the ultra-high chimney (height 200m) that was previously installed, and 2 is the steel plate segment of the required height.
The inner cylinder 2a is formed by joining together a number of parts, and 3 and 4 are square support beams built in the middle using the top of the outer cylinder 1 and a part of the notch, and each beam on the four sides has the required hydraulic pressure. jack 5a,
The sb's are arranged in two groups of the same number and can be rearranged freely.

These hydraulic jacks 5a, sb have hanging wires 6a, 6 in the center.
This type has a center hole through which the wires 6a and 6b are respectively inserted, and each hanging wire 6a... 6b is jacked up by a certain size at a time.

The lower ends of each of the hanging wires 6a, 6b are connected to a hanging jig 7 attached around the upper part of the segment assembly, and the segment assembly is moved upward one section at a time under the action of the hydraulic jacks 5a, sb. and lift it up.

In order to attach the inner tube 2 to the inside of the outer tube 1, first, as shown in FIG. and bring it in.

Next, it is suspended once using an electric chain chuck 10 provided inside the lower part of the outer cylinder, rotated horizontally to align the center, and then changed to a hanging wire 6a.

Once the first segment 2a is lifted to the required height using the hydraulic jack 5a on one side of each intermediate support beam 4, the second segment 2a is brought in, aligned, and then welded to the underside of the first segment 2a. .

If several segments are joined by repeating the third and fourth loading, lifting and joining of each segment,
As shown in FIG. 2, the above-mentioned lifting jig 7 is attached around the segment assembly, the hanging wire 6b is connected, the previously attached hanging wire 6a is removed and the suspension is changed, and the lifting is performed using only the other hydraulic jack 5b. I do.

Furthermore, if the load on the segment assembly becomes large by repeating the above process, connect the suspended wire 6a to the hanging jig 7 and add it to all the hydraulic jacks 5a, sb.
Each node is lifted using the lifting wires 6a and 6b.

Next, when the segment assembly reaches a length corresponding to the upper half 2A of the inner cylinder 2, the hydraulic jacks 5a and 5b (depending on the weight, use another set of jacks 5c)
One side at a time, the intermediate support beam 4 is transferred to the support beam 3 at the top of the outer cylinder, and as shown in FIG. 6, the ten-half part 2A is lifted up to the top of the outer cylinder 1 at once and temporarily fixed to the top of the outer cylinder.

Once the temporary fixing of the two people in the ten-and-a-half section is completed, the replaced hydraulic jacks 5a and sb are replaced again on the intermediate support beam 4,
It is used to form a segment assembly having a length corresponding to the lower half 2B of the inner cylinder 2.

The forming process for the lower half 2B is the same as that for the upper half 2A.
Hanging wire 6a for each node. 6b, and is further welded integrally to the upper half 2A to form an inner cylinder 2 having a length extending from the top of the outer cylinder to the bottom.

As shown in FIG. 7, this lower half part 2B is welded after the inner cylinder frame 11 is attached to the lowest part, and the temporary fixing is replaced with permanent fixing, and the outer cylinder 1 and the inner cylinder 2 are welded together. Unify.

In the above embodiment, a hydraulic jack is used in which the suspension wire is inserted through the center and the suspension wire is directly lifted. However, a hydraulic jack that is equipped with a suspension wire socket and that lifts and lowers a short rod may also be used. There are no particular limitations on the hydraulic jack, as it can be used.

As described above, this invention provides a support beam at the top of the outer cylinder and the middle of the inside of an ultra-high chimney, and uses hanging wires from a plurality of groups of jacks installed on the intermediate support beam to transport segments into the outer cylinder. Lifting the segment, lifting each segment, and joining the lower segments are carried out by replacing the jack, and the entire ten-and-a-half portions of the inner strip formed by repeating this operation are mounted on the top support beam. The replaced jack is used to lift the top support beam, and after temporary fixing, the lower half of the inner tube is formed by the same process as above, and the inner tube is completed by joining with the upper half, which is different from the conventional construction method. The length of the hanging wire used for lifting can be shorter than that, and the lifting device can also be simplified, reducing equipment costs.

Furthermore, since the lifting is done separately between the middle and the top of the outer cylinder,
This has the advantage that the entire load is not applied to the top of the outer cylinder, the burden on the top of the outer cylinder is reduced, and the load is halved.

In addition, since the lifting is done by dividing the lifting into multiple groups of jacks, it is possible to replace or lift the segment with some jacks while holding the segment with other jacks, and it is possible to construct the inner tube even if the outer tube is narrow. It has the characteristics of being able to be carried out safely.

[Brief explanation of the drawing]

The drawings illustrate the method of constructing the inner cylinder of a super high chimney according to the present invention, and FIGS. 1 to 2 are schematic partial longitudinal sectional side views showing the process of forming the lower half of the inner cylinder, and FIG. is the plan view of the intermediate support beam,
FIGS. 4 to γ are partially longitudinal sectional side views schematically showing the steps from forming the ten-and-a-half portions to completing the inner strip. 1... Outer cylinder, 2... Inner cylinder, 2A...
...Upper half, 2B...Lower half, 2a...
...Segment, 3...Top support beam, 4...
・Intermediate support beam, 5a, 5b...Hydraulic jack, 6
a, 6b... Hanging wire, γ... Hanging jig○

Claims (1)

[Claims] 1. When placing an inner cylinder made of joined steel plate segments inside the outer cylinder of an ultra-high chimney made of reinforced concrete,
A support beam is provided at the top of the outer cylinder and in the middle of the inside, and by means of hanging wires from multiple groups of jacks arranged on the intermediate support beam,
The segments carried into the outer cylinder are lifted up, each section is lifted and the lower segments are joined by changing the jack, and this operation is repeated in order to form the upper half of the inner cylinder, and then the upper half of the inner cylinder is formed. After hoisting the entire half part onto the top support beam using the jack mentioned above and temporarily fixing it, the lower half of the inner frame is formed to the bottom of the upper half using the same process as above, and then This method of constructing an inner cylinder for an ultra-high chimney is characterized by the fact that both parts are then joined together to complete the inner cylinder.