JP2013163905A - Construction method for lining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently constructing a new lining without dismantling and removing an existing lining.SOLUTION: In a method for constructing a new lining 3 on the inside with respect to an existing lining 2 provided inside an external cylinder 1 of a chimney 10, the new lining 3 has a plurality of steel segment panels 4 sequentially arranged in the circumferential direction and height direction of the existing lining 2 and joined to one another, and is joined to the existing lining 2 and external cylinder 1 of the chimney 10 by an attachment structure which allows height-direction thermal expansion of the new lining in a plurality of positions in the circumferential direction and the height direction.

Description

  The present invention relates to a lining construction method provided inside an exhaust pipe typified by a chimney, and more particularly, to a lining construction method that can be applied when repairing an existing structure.

  In order to repair an existing lining of a deteriorated chimney, the deteriorated lining is dismantled, removed and reinforced, and then a new lining is sprayed. When the lining is deteriorated over the entire surface of the chimney, the above operation is performed over the entire surface of the chimney, but the burden is large. Therefore, Patent Literature 1 proposes a chimney lining repair device that can perform unmanned lining dismantling work and reduce generated noise.

Japanese Patent Publication No. 7-92220

However, even if the apparatus proposed in Patent Document 1 is used, the disassembly and removal of the existing lining is a factor that lengthens the construction period and increases the repair cost.
This invention is made | formed based on such a subject, and provides the method which can construct a new lining efficiently.

The present invention relates to a method for constructing a new lining inside an existing lining provided inside an outer cylinder of an exhaust pipe.
This new lining has a stacking structure in which a plurality of steel segment panels are sequentially arranged in the circumferential direction and the height direction of the exhaust stack, and are connected to each other. It is attached to the existing part of a cylinder.
In the lining construction method of the present invention, a new lining is constructed inside without dismantling and removing the existing lining, so that the construction period and construction cost spent for the disassembly and removal can be omitted.
In addition, if a weather-corrosion resistant material is selected as the steel used for the segment panel, the service life can be longer than that of concrete lining, thereby reducing costs.
In addition to the chimney, the exhaust pipe in the present invention broadly includes structures provided for exhaust, which include a lining.

  In the present invention, the new lining can be integrated with all segment panels arranged in the height direction by welding. However, it is preferable that a new lining is constituted by a plurality of segment linings divided in the height direction, and each of the segment linings is attached to an existing portion of the exhaust pipe by an attachment structure that allows thermal expansion and contraction. When the mounting structure is integrated, the thermal expansion and contraction accumulated in the height direction is increased. On the other hand, the segmentation in the height direction has an advantage that the amount of thermal expansion and contraction of each segment lining can be suppressed to a small value.

  In the present invention, it is possible to install a damping additional element that consumes vibrational energy due to the deformation difference between the newly installed lining and the outer cylinder. By installing a damping additional element at the time of construction of a new lining, a seismic control function can be added to an existing exhaust stack at a low cost. In addition to the form which installs between this newly added lining and an outer cylinder, this damping addition element can also be made into the form which the one part exposes to the outer side of an outer cylinder. Further, in the present invention, this vibration energy can correspond to both of the vertical deformation difference and the radial deviation difference of the exhaust stack.

  According to the present invention, it is possible to dismantle and remove the existing lining, so that new construction and repair of the lining can be realized at a low cost by shortening the construction period and reducing the construction cost. In addition, if a weather resistant steel material is selected for the segment panel, the cost can be reduced by extending the useful life. Furthermore, earthquake resistance can be improved by installing a damping additional element.

It is a figure which shows the lining construction method in 1st Embodiment. It is a fragmentary sectional view which shows the example which attaches a newly installed lining (segment panel) to an existing part by fixation. It is a fragmentary sectional view which shows the example which attaches a new lining (segment panel) to an existing part by a movement. It is a figure which shows the lining construction method in 2nd Embodiment. It is a figure which shows the attenuation | damping addition element in 3rd Embodiment. It is a figure which shows the other example of the attenuation | damping addition element in 3rd Embodiment. It is a figure which shows the attenuation | damping addition element in 4th Embodiment.

[First Embodiment]
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
In the first embodiment, since the existing lining 2 already provided in the chimney 10 has deteriorated, a new lining 3 is newly constructed on the inside thereof. The existing concrete lining 2 is provided inside the steel outer cylinder 1 and is constructed during or after the construction of the chimney 10 (FIG. 1 (a)).

The new lining 3 is formed by combining a number of segment panels 4 as shown in FIG.
The segment panel 4 is a member having an arc-shaped cross section obtained by dividing the hollow cone in the circumferential direction. The segment panel 4 is arranged in the circumferential direction by the number of divisions and connected to form a structural unit in the circumferential direction of the new lining 3. . For example, when the central angle is divided by 90 °, the four segment panels 4 are arranged in the circumferential direction and joined to each other. The new lining 3 is joined to each other by arranging the necessary number of structural units in the circumferential direction in the height direction. The segment panel 4 is made of a steel material having weather resistance against smoke discharged through the chimney 10, for example, a stainless steel material. However, in order to prevent buckling when the new lining 3 is configured, Thickness and other sizes are specified.

  The new lining 3 (segment panel 4) is heated and heated by the smoke passing through the chimney 10, and the new lining 3 (segment panel 4) is made of steel. (Hereinafter, thermal expansion and contraction) occurs, so that a relative deformation difference occurs with an existing structure. Therefore, the new lining 3 is attached to the outer cylinder 1 and the existing lining 2 which are existing portions of the chimney 10 so as to allow thermal expansion and contraction. The mounting structure that allows this thermal expansion and contraction is provided at a fixed point FP and a movable point MP (FIG. 1C), which will be described later in detail.

The new lining 3 is constructed as follows.
As shown in FIG. 1B, a necessary number of segment panels 4 are carried from the upper opening of the chimney 10 by, for example, a crane. The carried-in segment panels 4 are sequentially arranged in the circumferential direction from the lower end of the chimney 10 to the inside of the chimney 10, and the adjacent segment panels 4 are joined to each other by welding. When the segment panels 4 for one round have been joined, the segment panels 4 for the next round located in the upper stage are sequentially arranged in the circumferential direction, and similarly joined by welding, and the adjacent segment panels 4 in the height direction. Are joined together by welding. By repeating this to the upper end of the chimney 10, the construction of the new lining 3 is completed.
The above-described procedure for attaching the segment panel 4 for one turn and then attaching the segment panel 4 for the upper turn is an example. For example, the segment panel 4 is attached in a plurality of stages, for example, two stages in the vertical direction. The new lining 3 can also be constructed by repeating this in the circumferential direction.

In this process, the segment panel 4 is attached to the chimney 10 so as to allow thermal expansion and contraction. As shown in FIG. 1C, at the fixed point FP, the segment panel 4 is attached to the chimney 10 such that the displacement in the height direction is restrained. Moreover, as shown in FIG.1 (c), the segment panel 4 is attached with respect to the chimney 10 so that the displacement of a height direction is accept | permitted in the movable point MP. In this example, while the fixed point FP is provided on the base side of the chimney 10, the movable point MP is provided at a plurality of positions above the fixed point FP, so that the fixed FP is used as a reference to the upper side in the height direction of the new lining 3. Displacement due to directed thermal expansion and contraction is allowed.
The positions where the fixed point FP and the movable point MP are provided may be determined according to the specifications of the newly installed lining 3. Further, the fixed point FP and the movable point MP can be provided at a plurality of locations in the circumferential direction.

Although the specific structure in the fixed point FP is arbitrary, the joining member shown to Fig.2 (a)-(d) can be used, for example. In FIG. 2, only the segment panel 4 is represented by a line segment. The same applies to FIG.
2A, a part of the existing lining 2 is held to form a support gap 5, and an outer cylinder side latching body 6 is arranged there and joined to the exposed inner wall of the outer cylinder 1. FIG. The outer cylinder side latching body 6 is made of a steel material in the same manner as the segment panel 4, so that this joining can be performed by welding. The same applies to the following. On the other hand, the inner cylinder side latching body 7 is also joined to the segment panel 4 side. And the inner cylinder side latching body 7 is mounted on the outer cylinder side latching body 6, and both are joined by welding. As a result of providing the joining position consisting of the outer cylinder side latching body 6 and the inner cylinder side latching body 7 on the upper end side of the segment panel 4, the thermal expansion and contraction of the segment panel 4 on the upper end side with respect to the joining position is suppressed. The vertical displacement at the upper end of the segment panel 4 is suppressed. The segment panel 4 that is allowed to be displaced in the height direction is disposed on the upper side of the segment panel 4 thus attached. If it is advantageous that the installation position of the fixed point FP is at the lower side of the segment panel 4 or near the center in the relationship with the existing structure, the position can naturally be changed.

In addition, since it is difficult to construct such a joining structure and construction of the new lining 3 on site, it is generally difficult to construct the lining 3 in contact with the existing lining. It is assumed that a gap is formed between the lining 3) and the existing lining 2. However, it is necessary to consider so that the inner diameter can be secured in a range that does not hinder the flow of smoke (fluid) flowing through the conventional cylinder where only the existing lining 2 is provided.
Moreover, although the displacement in the height direction is restrained by joining the outer cylinder side locking body 6 and the inner cylinder side locking body 7 in the above, this is an example, for example, the inner cylinder side locking body 7 Displacement in the height direction may be constrained by abutting the upper end of the butt against the existing lining 2 in the support gap 5.
Moreover, the form of the outer cylinder side latching body 6 and the inner cylinder side latching body 7 is arbitrary, and as shown in FIG. 2B, for example, an outer cylinder side latching body 8 made of an angle material may be used. it can.
Further, in the example shown here, a gap is provided between the existing lining 2 and the new lining 3, but this gap can be filled as necessary. In this case, for the purpose of protecting the deteriorated surface of the existing lining 2 or the like, when repairing a flexible material that can follow the displacement generated between the existing lining 2 and the new lining 3 or an object for which no displacement is assumed. Can use concrete-based materials and other materials.

2C is the same as FIG. 2A in that the support gap 5 is formed, but the tip of the fixing bolt 9 penetrating the segment panel 4 is joined to the inner wall of the outer cylinder 1. And the support space | gap 5 is refilled with the filler 11, for example, mortar.
In the example of FIG. 2 (d), the filler 13 is interposed between the existing lining 2 and the segment panel 4 without forming the support gap 5, and they are fixed with anchor bolts 12 penetrating them.

Next, although the attachment structure at the movable point MP is also arbitrary, for example, the joining members shown in FIGS. 3A to 3C can be used.
FIG. 3A is similar in appearance to the joint structure of FIG. 2A, and a support gap 5 is formed by attaching a part of the existing lining 2 to the outer cylinder side locking body 6. The same is the place where it is placed and joined to the inner wall of the outer cylinder 1. However, although the inner cylinder side latching body 14 joined to the segment panel 4 is mounted on the outer cylinder side latching body 6, both are not joined. A sufficient space for displacing the inner cylinder side locking body 14 is provided in the support gap 5. Accordingly, since the inner cylinder side latching body 14 is allowed to move upward in the height direction in the support gap 5, when the thermal expansion or contraction occurs in the segment panel 4, the segment panel 4 is displaced upward accordingly. In addition, the thermal expansion and contraction of the individual segment panels 4 attached to the lower stage is added to the upward displacement.

The structure shown in FIG. 3A allows displacement in the horizontal direction (radial direction, circumferential direction). On the other hand, as shown in FIGS. 3B and 3C, in order to integrate with the existing structure, a structure that restricts the displacement in the horizontal direction can be installed.
In the example of FIG. 3B, the inner cylinder side locking body 15 having the locking projection 15a formed at the tip is joined to the segment panel 4, while the outer cylinder side locking having the locking projection 16a formed at the tip. The body 16 is joined to the inner wall of the outer cylinder 1. Then, by disposing the locking protrusion 15a on the outer peripheral side and the locking protrusion 16a on the inner peripheral side, the segment panel 4 (new lining 3) will be separated from the existing lining 2 by a predetermined distance in the radial direction. Even so, the locking projection 15a and the locking projection 16a are engaged with each other, so that the radial displacement of the segment panel 4 (new lining 3) is restrained.
In the example of FIG. 3C, the inner cylinder side locking body 17 having a U-shaped cross section is joined to the segment panel 4, while the tip of the locking bolt 18 is joined to the inner wall of the outer cylinder 1. The inner cylinder side locking body 17 is formed with a long hole 17a penetrating the front and back, and the locking bolt 18 passes through the long hole 17a. Therefore, even if the segment panel 4 (new lining 3) is displaced in the radial direction and the circumferential direction, the inner cylinder side locking body 17 is engaged with the locking bolt 18 penetrating the elongated hole 17a, thereby The radial and circumferential displacements of the panel 4 (new lining 3) are restrained.
As shown in FIGS. 3B and 3C, by restraining the horizontal deformation of the segment panel 4 (new lining 3) and the existing structure, an increase in rigidity as a structure when an earthquake or wind load is applied, Effects such as strength increase and deformation suppression can be expected.

As described above, according to the first embodiment, since the new lining 3 can be installed without dismantling and removing the existing lining 2, new construction and repair of the lining can be achieved at a low cost by shortening the construction period and reducing the construction cost. Can be realized.
Moreover, since the new lining 3 is made of a material having weather resistance, the service life is longer than that of the conventional concrete lining, and the life cycle cost can be reduced.
Furthermore, since the segment panel 4 at the base is a fixed point and the segment panel 4 above it is allowed to expand and contract, the thermal stress applied to the newly installed lining 3 is minimized even if the newly installed lining 3 is thermally expanded and contracted. be able to.

[Second Embodiment]
Although the first embodiment shows the new lining 3 as an integral structure in which the segment panel 4 is connected by welding from the base to the upper end, the present invention includes a new lining 20 divided into several in the height direction, You can also In the second embodiment, this example will be described with reference to FIG.
As shown in FIG. 4, in the second embodiment, a new lining 20 is configured from a plurality of segment linings 21 divided in the height direction. In addition, the segment lining 21 is comprised by joining the some segment panel 4 by welding similarly to 1st Embodiment.

Each segment lining 21 is provided with a fixing point FP on each base side by connecting with a fixing connecting member shown in FIG. 2, and on the upper end side by connecting with a movable connecting member shown in FIG. A movable point MP is provided. The fixed points FP and the movable points MP are provided at appropriate circumferential positions in the same manner as in the first embodiment.
The positions where the fixed point FP and the movable point MP are provided are not limited to the above. For example, the movable point MP can be provided on the base side of each segment lining 21, and the fixed point FP can be provided on the upper end side. Alternatively, a fixed point FP may be provided at an intermediate portion in the height direction of each segment lining 21, and a movable point MP may be provided at one or both of the upper end side and the base side. In this case, since the movable amount at each of the upper and lower ends can be reduced, the load applied to the connection band 22 described later can be reduced.

  A gap S is provided between the segment linings 21 adjacent in the vertical direction in consideration of the thermal expansion and contraction of the segment lining 21 positioned below. However, in order to prevent smoke from entering the existing lining 2 from the gap S, a connection band 22 is provided from the upper segment lining 21T to the lower segment lining 21B as shown in FIG. 4B. It is preferable to cover the gap S. The connection band 22 is configured as a structure and material having an effect of developing flexibility according to the thermal expansion and contraction of the segment lining 21 and having weather corrosion resistance in the same manner as the newly-formed lining. For example, as shown in FIG. 4B, the structure is configured as a smoothly bent plate structure, and as the material, a steel strip of the same material as the segment panel 4 can be applied.

The second embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
That is, according to the first embodiment, the thermal expansion and contraction accumulated from the base portion becomes very large at the top portion of the new lining 3, so that it is necessary to have a structure that secures a movable amount corresponding thereto. On the other hand, according to the second embodiment, the new lining 20 divided in the height direction can reduce the amount of movement due to thermal expansion and contraction of each segment lining 21, so that the connecting member provided at the movable point MP. The structural stability of the new lining 20 as a whole can be ensured while preventing the rigidity of the lining 20 from being lowered.

[Third Embodiment]
In addition to constructing the new lining 3 of the first and second embodiments, the present invention can add a vibration control effect. The third embodiment will explain this example.
In the third embodiment, as shown in FIG. 5, a damping addition element 30 is installed between the outer cylinder 1 and the new lining 3 (inner cylinder). Although not shown in FIG. 5, the damping addition mechanism 30 is provided in a space formed by connecting a part of the existing lining 2.

  The damping addition element 30 may be of any type as long as it can consume the vibration energy of the chimney 10 due to the deformation difference between the outer cylinder 1 of the chimney 10 and the new lining 3. For example, an element that converts history energy by its own deformation (such as an elastic-plastic body such as steel, a viscoelastic body such as high-damping rubber, etc., which converts its shear deformation or bending deformation into energy. , (B)), those that convert to thermal energy by friction (FIGS. 5C and 5D), and other known elements can be applied. Note that FIG. 5C uses the friction between the circumferential surfaces, and FIG. 5D uses the friction between the radial surfaces. Furthermore, a damping may be added by installing a viscoelastic body such as the above-described high damping rubber, a viscous body, or the like at a location corresponding to the friction surface having the structure as shown in FIGS. 5 (a) and 5 (b) show a deformed state in which there is a displacement difference in the vertical direction between the outer cylinder 1 and the new lining 3, but also in the horizontal direction as shown in FIG. 6 (a). An element that can convert axial deformation into energy so that a change in radial clearance between the outer cylinder 1 and the new lining 3 can be converted into energy when a state in which a deformation difference occurs can be assumed. In addition to the vertical direction as shown in FIG. 5D, a friction element, a viscoelastic element, and a viscous element that can follow the deformation in the radial direction as shown in FIG. 6B can be used.

Although the damping addition element 30 can be provided in arbitrary plural places in the height direction and the circumferential direction of the chimney 10, it is preferable to install it based on the following guidelines.
Height direction: The order to be subjected to vibration control is set (arbitrarily set), and is installed at a location where the deformation difference between the outer cylinder 1 and the new lining 3 up to the order becomes large. For example, a node having a large curvature, a position where radial deformation becomes large, and the like are applicable.
Circumferential direction: Arranged at equal pitches in the circumferential direction so that there is no difference in damping effect depending on the vibration direction. For example, the damping additional element 30 can be provided at a 45 ° pitch.

  In the third embodiment described above, the same effect as that of the first embodiment can be obtained. In addition, when a large shake such as an earthquake occurs, the damping additional element 30 is caused by the displacement difference between the outer cylinder 1 and the new lining 3. The earthquake energy is consumed by deforming or sliding each other. In addition, by constructing the new lining 3 together with the damping additional element 30, the third embodiment can add a vibration control function to the existing chimney 10 at low cost.

[Fourth Embodiment]
In the third embodiment, the damping addition element 30 is provided between the outer cylinder 1 and the new lining 3, that is, inside the outer cylinder 1, but the present invention is not limited to this, and the damping addition extending to the outside of the outer cylinder 1 is provided. An element 40 can be provided. By doing so, since the damping addition element 30 can cope with a larger deformation amount, a great vibration control effect is exhibited.
As shown in FIG. 7, in the fourth embodiment, a manhole 41 penetrating in the thickness direction is provided in the outer cylinder 1. As shown in FIG. 7, the manhole 41 is preferably reinforced by providing ribs 41 a around the manhole 41.
The inner cylinder projecting member 42 is fixed at a position corresponding to the manhole 41 on the outer peripheral surface of the new lining 3. The inner cylinder overhanging member 42 is exposed from the outer cylinder 1 to the outside through at least the tip side through the manhole 41. Further, the outer cylinder projecting member 43 is fixed to the outer peripheral surface of the outer cylinder 1. The outer cylinder overhanging member 43 has an L-shape (or may be changed in consideration of the existing structure such as a U-shape), and its tip 43 a faces the tip 42 a of the inner cylinder overhanging member 42. Yes. A damping additional element 40 is interposed between the tip 42 a of the inner cylinder overhanging member 42 and the tip 43 a of the outer cylinder overhanging member 43. It is assumed that the inner cylinder projecting member 42 and the outer cylinder projecting member 43 have sufficient rigidity against deformation of the damping additional element 40. The same damping addition element 30 as that of the third embodiment can be applied to the damping addition element 40.

In the fourth embodiment described above, in addition to obtaining the same effect as the third embodiment, the damping additional element can be installed even when the distance between the outer cylinder 1 and the new lining 3 is small. It can exert a great vibration control effect. Further, in addition to being characterized in that the damping addition element 40 goes out of the outer cylinder 1, the inner cylinder overhanging member 42 and the outer cylinder overhanging member 43 are also accessible from the outside of the outer cylinder 1, so that maintenance thereof is easy. It is.
The position where the damping addition element 40 is installed may be the same as in the third embodiment, but a position where the inner cylinder overhanging member 42 and the outer cylinder overhanging member 43 can be easily installed can be selected. For example, in the case of a multi-leg type chimney, the position of a connecting beam corresponds.

In the above-described embodiment, an example of a chimney is shown as an exhaust pipe. However, as described above, the application of the present invention is not limited to a chimney.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Existing lining 3 New lining 4 Segment panel 5 Support space 6 Outer cylinder side latching body 7 Inner cylinder side latching body 9 Fixing bolt 10 Chimney 11, 13 Filler 12 Anchor 14 Inner cylinder side latching body 15 Inside Cylinder side locking body 15a Locking protrusion 16 Outer cylinder side locking body 16a Locking protrusion 17 Inner cylinder side locking body 17a Long hole 18 Locking bolt 20 New lining 21 Segment lining 22 Connection band 30 Attenuation additional element 40 Attenuation addition Element 41 Manhole 41a Rib 42 Member 42a Tip 43 Member 43a Tip FP Fixed point MP Movable point S Clearance

Claims (5)

A method of constructing a new lining inside the existing lining provided inside the outer cylinder of the exhaust pipe,
The new lining is
A plurality of steel segment panels are sequentially arranged and joined to each other in the circumferential direction and the height direction of the exhaust pipe, and the exhaust pipe is provided with a mounting structure that allows thermal expansion and contraction in the height direction. Attached to the part,
A lining construction method characterized by this. The new lining is
It is composed of a plurality of segment linings divided in the height direction,
Each of the segment linings is joined to an existing portion of the exhaust stack by an attachment structure that allows the thermal expansion and contraction.
The lining construction method according to claim 1. Installing a damping additional element that consumes vibrational energy due to the deformation difference between the newly installed lining and the outer cylinder;
The lining construction method according to claim 1 or 2. The vibration energy is due to a vertical deformation difference.
The lining construction method according to claim 3. The vibration energy is due to a radial deformation difference of the exhaust stack.
The lining construction method according to claim 3.

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