CN111852166A - A D-shaped inner tube chimney support device - Google Patents

Abstract

The invention relates to a D-shaped inner cylinder chimney supporting device, and belongs to the technical field of chimney design and construction. The box beam comprises two truncated cone shells, a box beam and a truncated cone shell tangential connecting plate; a box-shaped beam is arranged between the two truncated cone shells sleeved on the peripheries of the two D-shaped inner cylinder chimneys; the intersection of the two truncated cone shells is provided with a truncated cone shell tangential connecting plate for connecting the two truncated cone shells into an oblong truncated cone shell. The invention provides an inner cylinder supporting device which not only saves the material of the cylinder wall, but also improves the reliable support of a D-shaped inner cylinder, and solves the problems that the inner cylinder of the smoke exhaust is stressed by uneven vertical support to generate larger internal stress and local instability. The inner cylinder can be ensured to run safely and reliably for a long time, and the implementation and popularization of the D-shaped inner cylinder chimney technology are ensured; the structure provided by the invention is safe, reliable and economical.

Description

A D-shaped inner tube chimney support device

technical field

The invention relates to a D-shaped inner tube chimney supporting device, which belongs to the technical field of chimney design and construction.

Background technique

The sleeve-type chimney includes a smoke exhaust inner cylinder (referred to as "inner cylinder") and an outer cylinder wall (referred to as "outer cylinder"). The inner cylinder is used to discharge the flue gas with corrosive effect; the sleeve-type chimney realizes the two different loads or effects of directly bearing external loads such as wind and directly bearing the effect of flue gas; load or action to ensure that it works properly.

In the construction of thermal power plants, two units share an outer chimney, and one unit corresponds to an inner smoke exhaust. In order to directly bear external loads such as wind and directly bear the effect of flue gas, the two different loads or effects are borne by different structures, and meet the maintenance and maintenance requirements of different service periods. The shape of the reinforced concrete outer cylinder is subjected to wind loads, earthquakes and the dead weight and horizontal displacement of the inner cylinder. , The function of the outer cylinder is separated, and the two inner cylinders operate independently under different working conditions, which are the main advantages of ordinary double inner cylinder chimneys.

Although the ordinary double inner tube chimney has the above advantages in function, due to the arrangement of the two inner tubes, its plane layout shape is: the dimension in one direction is more than twice the size in the other vertical direction, resulting in a larger horizontal section of the outer tube. Large space is wasted, that is, the ratio of the sum of the cross-sectional areas of the two inner cylinders (called "effective area") to the cross-sectional area of the outer cylinder is small, that is, the "utilization efficiency" coefficient of the outer cylinder is very low. Generally speaking, the cross-sectional area of the inner cylinder is determined by the amount of smoke exhaust, which is a fixed value, while the outer cylinder serves the inner cylinder. The cross-sectional size can be adjusted under the condition that the smoke passage area and plane layout of the inner cylinder are satisfied. Therefore, adjusting the cross-sectional shape and arrangement of the inner cylinder is the only way to improve the utilization efficiency of the outer cylinder.

The "utilization efficiency" coefficient of ordinary double-inner-tube chimneys is relatively low. Under the same "effective area", in addition to causing a substantial increase in the cross-sectional size of the outer tube, at the same time, the circumferential wind bending moment of the chimney is proportional to the square of the cross-sectional radius. As a result, the wall thickness of the upper part of the chimney is also greatly increased, which in turn causes the material consumption and floor area of the reinforced concrete outer cylinder above the ground to increase, which indirectly results in a substantial increase in the amount of basic engineering, making the entire chimney construction period. Compared with the single-tube chimney, the project investment has increased significantly.

Based on the above background, a D-shaped sleeve chimney patented technology (Chinese Patent No.: ZL201720076060.0) is currently used. However, the supporting technology of the D-shaped inner cylinder corresponding to this patented technology is more complicated than that of the ordinary circular inner cylinder. Caused the instability and damage of the inner cylinder, so that the technology could not be popularized and applied. The inner tube of the chimney is generally supported on the structural support platform between the inner and outer tubes. The structural support platform should be constructed before the inner tube, and the installation holes of the inner tube should be reserved. In order to meet the needs of hoisting and installation of the inner cylinder, the installation holes must be larger than the size of the inner cylinder. Therefore, after the inner cylinder is hoisted in place, the inner cylinder cannot be directly placed on the support platform, and a support device is required to transmit the dead weight of the inner cylinder to the support platform. At present, the general practice in China is to set 4 to 8 cantilevered short beams on the supporting platform to bear the weight of the entire inner cylinder (see Figure 1). The cylinder supports the platform steel member b, and the support platform steel member b is provided with an inner cylinder supporting short beam c to bear the weight of the entire inner cylinder. This support method will cause the inner cylinder to generate a large local bending moment, causing the horizontal cross-section shape of the inner cylinder within a certain height range above and below the supporting elevation of the inner cylinder to change from circular to non-circular section (see Figure 2 and Figure 3). Large internal stress is generated on the cylinder wall, which requires large-scale reinforcement of the inner cylinder in the support area (see Figure 4). Theoretically, this solution requires the inner cylinder to have a great hoop rigidity to resist local deformation of the inner cylinder. This kind of support solution makes the design of the inner cylinder usually uneconomical, and more importantly, the inner cylinder has a long service life. It has been in an unreasonable stress state, and once it encounters the extreme design conditions or local damage, the entire cylinder will collapse due to local instability. Therefore, there is an urgent need in the technical field to solve the technical problem of how to support the D-shaped inner tube chimney.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the technical problem of how to support the double D-shaped inner tube chimney.

In order to achieve the purpose of solving the above problems, the technical scheme adopted by the present invention is to provide a D-shaped inner tube chimney support device, which includes two truncated cone shells, a box beam and a tangential connecting plate of the truncated cone shell; A box beam is arranged between the two truncated cone shells on the outer periphery of the two D-shaped inner tube chimneys; the intersection of the two truncated cone shells is provided with a truncated cone shell for connecting the two truncated cone shells into an oblong truncated cone shell. The conical shell is tangentially connected to the plate.

Preferably, both ends of the truncated cone shell are provided with openings, the cross-sectional area of the opening at the upper end is smaller than that of the opening at the lower end, and the cross-section of the opening at the lower end is D-shaped.

Preferably, the box girder includes a box girder top plate, a box girder bottom plate and a box girder web; two parallel box girder webs are arranged between the box girder top plate and the box girder bottom plate that are parallel to each other. ;Two parallel box girder webs are respectively connected with the shells of two truncated cone shells, the truncated cone shells are arranged between the box girder top plate and the box girder bottom plate, and the openings at both ends of the truncated cone shell are located. The end faces are parallel to the box girder top plate and the box girder bottom plate.

Preferably, the number of the tangential connection plates of the frustoconical shell is set to be greater than or equal to 2.

Preferably, the tangential connecting plate of the frustoconical shell is arranged between the top plate of the box beam and the bottom plate of the box beam.

Preferably, the outer side of the shell of the frustoconical shell between the top plate of the box girder and the bottom plate of the box girder is provided with a box girder oblique stiffening rib for connecting the two frustoconical shells into one.

Preferably, the upper end surface of the truncated cone shell is provided with a truncated cone shell top plate, and the lower end surface is provided with a truncated cone shell bottom plate; a truncated cone shell stiffener is provided between the truncated cone shell top plate and the truncated cone shell bottom plate.

Preferably, the top plate of the truncated cone shell and the top plate of the box beam are on the same horizontal plane, and the bottom plate of the truncated cone shell and the bottom plate of the box beam are on the same horizontal plane.

Preferably, the upper end of the truncated cone shell is sleeved on the outer periphery of the D-shaped inner tube chimney, and the web of the box beam is connected to the tube wall of the D-shaped inner tube chimney.

Preferably, the D-shaped lower end surface of the truncated cone shell is connected to a support platform provided on the inner wall of the outer cylinder.

Preferably, the supporting platform is set as a steel platform, a reinforced concrete platform, or a combination platform of steel and concrete.

Compared with the prior art, the present invention has the following beneficial effects:

The invention provides an inner cylinder support device which not only saves the material of the cylinder wall, but also improves the D-shaped inner cylinder to obtain reliable support, and solves the problem of the large internal stress caused by the uneven vertical support of the smoke exhaust inner cylinder. and local instability. The long-term safe and reliable operation of the inner cylinder is guaranteed, and the implementation and popularization of the D-shaped inner cylinder chimney technology is ensured; the structure provided by the invention is safe, reliable and economical.

Description of drawings

Fig. 1 is the plane schematic diagram of common circular inner cylinder support;

Figure 2 is a schematic plan view of the local deformation of the inner cylinder caused by the action of the supporting short beam in the support area of the ordinary circular inner cylinder;

Fig. 3 is the B-B sectional view of Fig. 2, the elevational schematic diagram of the partial deformation of the inner cylinder;

Fig. 4 is the A-A sectional view of Fig. 1, for supporting short beam and inner cylinder stiffening ring beam schematic diagram;

5 is a schematic plan view of a D-shaped inner tube chimney support device of the present invention;

6 is a schematic plan view of the D-shaped inner cylinder chimney support device when the inner cylinder cutting half angle θ is equal to 90° of the present invention;

7 is a cross-sectional view taken along lines C-C to F-F of FIGS. 5 and 6 .

Reference signs: a. chimney outer cylinder; b. ordinary circular inner cylinder supporting platform steel member; c. ordinary circular inner cylinder supporting short beam; d. ordinary circular inner cylinder; 1. chimney outer cylinder; 2. cutting Conical shell; 3. Box girder; 4. Box girder web; 5. Box girder oblique stiffener; 6. Truncated conical shell tangential connecting plate; ; 9. Truncated cone shell stiffener; 10. Box girder top plate; 11. Box girder bottom plate; θ. Inner cylinder cutting half angle.

Detailed ways

In order to make the present invention more obvious and easy to understand, preferred embodiments are hereby described in detail with the accompanying drawings as follows:

As shown in Figures 5-7, the present invention provides a D-shaped inner tube chimney support device, comprising two truncated cone shells 2, a box beam 3 and a tangential connecting plate 6 of the truncated cone shell; A box beam 3 is arranged between the two truncated cone shells 2 on the outer periphery of the inner tube chimney; the intersection of the two truncated cone shells 2 is provided with a truncated cone for connecting the two truncated cone shells 2 into an oblong truncated cone shell The shell is tangentially connected to the plate 6 . Both ends of the truncated cone shell 2 are provided with openings, the cross-sectional area of the upper end opening is smaller than the cross-sectional area of the lower end opening, and the cross-sections of the upper and lower end openings are both D-shaped; A frustoconical shell bottom plate 7; a frustoconical shell stiffener 9 is provided between the frustoconical shell top plate 8 and the frustoconical shell bottom plate 7; the box girder 3 includes a box girder top plate 10, a box girder bottom plate 11 and a box girder web plate 4; There are two parallel box beam webs 4 between the box beam top plate 10 and the box beam bottom plate 11 that are parallel to each other; The shell is connected, the frustum shell 2 is arranged between the box girder top plate 10 and the box girder bottom plate 11, and the top plate 8 and the bottom plate 7 provided on the frustum shell 2 are located at the end faces of the box girder top plate 10 and the box girder respectively. The beam bottom plate 11 is located on the same horizontal plane. The number of frustoconical shell tangential webs 6 is set equal to two. The truncated cone shell tangential connecting plate 6 is arranged between the box girder top plate 10 and the box girder bottom plate 11 . The outer side of the shell of the frustoconical shell 2 between the box girder top plate 10 and the box girder bottom plate 11 is provided with a box girder oblique stiffening rib 5 for connecting the two frustoconical shells into one. The upper end of the truncated cone shell 2 is sleeved on the outer periphery of the D-shaped inner tube chimney, and the box beam web 4 is connected to the straight section tube wall of the D-shaped inner tube chimney. The D-shaped lower end face of the truncated cone shell is connected with the support platform provided on the inner wall of the outer cylinder 1 . The supporting platform is set as a steel platform, a reinforced concrete platform, or a combination platform of steel and concrete.

The technical solution of the present invention is to provide a "D"-shaped inner tube chimney support device, the support device includes two symmetrical D-shaped truncated cone shells 2 and a box beam 3, two D-shaped truncated cone shells 2 A stable "large oblong truncated cone shell" supporting device is formed by the box beam 3 and the tangential connecting plate 6. The small diameter end of the truncated cone shell 2 is connected to the wall of the arc section of the D-shaped inner cylinder, and the truncated cone shell The large-diameter end of the box beam is connected to the support platform, and the box beam web 4 is connected to the cylinder wall of the straight section of the D-shaped inner cylinder. The support device can evenly transmit the internal force of the inner cylinder to the support platform, the inner cylinder is evenly stressed in the support area, has good stability, is safe, reliable and economical. The D-shaped inner tube chimney support device is composed of two D-shaped truncated cones 2 with a box beam 3 in the middle and the beam as the axis of symmetry and a tangential end plate. The middle box beam 3 of the D-shaped inner tube chimney support device can be a "lattice box" section composed of two larger "channel steels" when the distance between the two inner tubes is large, so as to save steel, and The steel limbs are facing away from the inner cylinder side of the corresponding support. The D-shaped inner tube chimney support device can be fixed on the reinforced concrete support platform, or on the steel platform, or on the steel-concrete composite platform.

As shown in FIG. 5 and FIG. 6 , it includes two D-shaped truncated cone shells 2 , a box beam 3 , and two truncated cone shell tangential connecting plates 6 . Two frustoconical shell tangential connecting plates 6 connect the two D-shaped frustoconical shells 2 into an "oval" frustoconical shell. When the cutting half angle θ is equal to 90°, the two truncated cone shell tangential connecting plates 6 coincide with the box beam oblique stiffener 5 at the end of the truncated cone shell, and evolve into a D-shaped inner cylinder support device as shown in FIG. 6 .

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form or substance. It should be pointed out that those of ordinary skill in the art can also Several improvements and additions have been made, and these improvements and additions should also be regarded as the protection scope of the present invention. All those skilled in the art, without departing from the spirit and scope of the present invention, can utilize the above-disclosed technical content to make some changes, modifications and equivalent changes of evolution, all belong to the present invention. Equivalent embodiments; at the same time, any modification, modification and evolution of any equivalent changes made to the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A D-shaped inner cylinder chimney supporting device is characterized in that: the box beam comprises two truncated cone shells, a box beam and a truncated cone shell tangential connecting plate; a box-shaped beam is arranged between the two truncated cone shells sleeved on the peripheries of the two D-shaped inner cylinder chimneys; the intersection of the two truncated cone shells is provided with a truncated cone shell tangential connecting plate for connecting the two truncated cone shells into an oblong truncated cone shell.

2. A D-shaped inner barrel stack support arrangement as claimed in claim 1, wherein: openings are formed in two ends of the truncated cone shell, the sectional area of the opening in the upper end is smaller than that of the opening in the lower end, and the cross section of the opening in the lower end is D-shaped.

3. A D-shaped inner barrel stack support arrangement as claimed in claim 2, wherein: the box beam comprises a box beam top plate, a box beam bottom plate and a box beam web plate; two parallel box-type beam webs are arranged between the mutually parallel box-type beam top plate and the box-type beam bottom plate; the two parallel box-shaped beam webs are respectively connected with the shells of the two truncated cone shells, the truncated cone shells are arranged between the box-shaped beam top plate and the box-shaped beam bottom plate, and the end surfaces of the truncated cone shells, where the openings at the two ends are located, are parallel to the box-shaped beam top plate and the box-shaped beam bottom plate.

4. A D-shaped inner barrel stack support arrangement as claimed in claim 3, wherein: the number of the tangential connecting plates of the truncated cone shell is set to be more than or equal to 2.

5. A D-shaped inner barrel stack support arrangement as claimed in claim 4, wherein: the truncated cone shell tangential connecting plate is arranged between the box-shaped beam top plate and the box-shaped beam bottom plate.

6. A D-shaped inner barrel stack support arrangement as claimed in claim 5, wherein: and a box beam oblique stiffening rib used for connecting the two truncated cone shells into a whole is arranged on the outer side of the shell of the truncated cone shell between the box beam top plate and the box beam bottom plate.

7. A D-shaped inner barrel stack support arrangement as claimed in claim 6, wherein: the upper end surface of the truncated cone shell is provided with a truncated cone shell top plate, and the lower end surface of the truncated cone shell is provided with a truncated cone shell bottom plate; a truncated cone shell stiffening rib is arranged between the truncated cone shell top plate and the truncated cone shell bottom plate.

8. A D-shaped inner barrel stack support arrangement as claimed in claim 7, wherein: the upper end of the truncated cone shell is sleeved on the periphery of the D-shaped inner cylinder chimney, and the box-shaped beam web is connected with the cylinder wall of the D-shaped inner cylinder chimney.

9. A D-shaped inner barrel stack support arrangement as claimed in claim 8, wherein: the lower end surface of the D shape of the truncated cone shell is connected with a supporting platform arranged on the inner wall of the outer cylinder.

10. A D-shaped inner barrel stack support arrangement as claimed in claim 9, wherein: the supporting platform is a steel platform, a reinforced concrete platform or a platform formed by combining steel and concrete.

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