A reinforcement structure of steel tube concrete column for kiln tail and its reinforcement method

Abstract

The present invention discloses a reinforcement structure for a steel tube concrete column at the tail of a kiln and a reinforcement method thereof. The reinforcement structure comprises a top annular node plate and a bottom annular node plate fixedly arranged on the outside of the steel tube concrete column, and a plurality of supporting steel pipes, the two ends of the supporting steel pipes being connected to the top annular node plate and the bottom annular node plate respectively; lateral constraints are provided between the supporting steel pipes, and the lateral constraints connect adjacent supporting steel pipes; radial constraints are provided between the supporting steel pipes and the concrete column, one end of the radial constraints is fixedly connected to the supporting steel pipe, and the other end is connected to the steel tube concrete column; during construction of the present invention, a jack is used to apply pre-pressure to the reinforcement structure; stiffening ribs are then welded for reinforcement and the jacks are removed. The present invention does not destroy the original structure and can ensure the safety of the original structure during the reinforcement construction process; an assembled all-steel structure reinforcement scheme is adopted, the construction method is convenient, the construction difficulty is low, and the construction period can be greatly shortened.

Description

Technical Field

[0001] The invention relates to a kiln tail concrete column, in particular to a reinforcement structure of a steel tube concrete column used in a kiln tail and a reinforcement method thereof. Background Art

[0002] The cement industry is energy-intensive and highly polluting, requiring energy-saving and carbon-reduction upgrades. Capacity upgrades in the cement industry typically involve upgrading the kiln tail preheater by expanding the capacity of the precalciner and cyclone. Typically, a five-stage preheater is added to achieve increased production capacity. However, this approach increases the overall load on the kiln tail frame, potentially limiting the bearing capacity of the existing frame columns, necessitating reinforcement.

[0003] The kiln tail frame's frame columns are typically constructed of concrete-filled steel tubes (CFSTs), meaning concrete is filled into steel tubes. Existing reinforcement methods for circular reinforced concrete columns primarily include welded steel tubes with increased cross-sections and externally bonded steel reinforcement. The welded steel tube method involves welding the newly added steel tubes over the existing steel tube columns, pouring fine stone concrete or grouting material, and installing weld studs on both the inner and outer walls to enhance interoperability between the new and existing structures. However, this method requires reductions in the new structure during load analysis, underutilizing the material and resulting in poor economic efficiency. The addition of new structures also requires polishing and rust removal of the existing steel tubes, resulting in a long construction period. The bonded steel method uses structural adhesive to bond the newly added steel plates to the existing steel tube columns. This method requires thorough paint and rust removal of the existing steel columns, requiring reductions in the new structure during load analysis. Furthermore, structural adhesives are expensive, resulting in poor overall economic efficiency. The thickness of the externally bonded steel plates is limited, resulting in limited load-bearing capacity, temperature sensitivity, and the potential for rapid aging, resulting in poor durability.

[0004] It can be seen that in order to ensure that the newly added parts can bear the same load as the original structure, conventional reinforcement methods usually require suspension of work and production, dismantling of original equipment, unloading of structural loads, and reinstallation after the reinforcement is completed. This will result in long construction time and poor economic efficiency. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a reinforcement structure and reinforcement method for steel tube concrete columns for kiln tail that are easy to construct and highly economical.

[0006] Technical solution: The reinforcement structure of the steel tube concrete column for the kiln tail described in the present invention is based on the setting of the steel tube concrete column, and is characterized in that it includes a top annular node plate and a bottom annular node plate fixedly arranged on the outside of the steel tube concrete column, and a plurality of supporting steel pipes arranged on the periphery of the steel tube concrete column, and the two ends of the supporting steel pipes are respectively connected to the top annular node plate and the bottom annular node plate; lateral constraints are provided between the supporting steel pipes, and the lateral constraints connect two adjacent supporting steel pipes; radial constraints are provided between the supporting steel pipes and the concrete column, one end of the radial constraint is fixedly connected to the supporting steel pipe, and the other end is connected to the steel tube concrete column.

[0007] Preferably, the upper end of the supporting steel pipe is connected to the top annular node plate through a top node ear plate and a top head plate. The top node ear plate is welded to the bottom of the top annular node plate, and the top head plate is welded to the top of the supporting steel pipe. The top node ear plate and the top head plate are connected by bolts.

[0008] Preferably, a bracket is provided between the lower end of the supporting steel pipe and the bottom annular node plate, the bracket is welded to the bottom annular node plate, and includes a bottom node ear plate. A bottom head plate is welded to the lower end of the supporting steel pipe, and the bottom node ear plate and the bottom head plate are connected by bolts.

[0009] Preferably, the bracket includes a middle annular node plate, the middle annular node plate and the bottom annular node plate are connected by a plurality of stiffening ribs, a support corresponding to the supporting steel pipe is provided on the top of the middle annular node plate, and the bottom node ear plate is welded above the support.

[0010] Preferably, one end of the lateral restraint is welded with a node plate, and the other end is welded to one side of the supporting steel pipe; a connecting ear plate is provided at the corresponding position on the other side of the supporting steel pipe, and the connecting ear plate and the node plate of the other lateral restraint are connected by bolts.

[0011] Preferably, the connecting ear plate is provided with an oblong hole for mounting bolts.

[0012] Preferably, the radial restraint includes a T-shaped restraint member and an L-shaped restraint member; two L-shaped restraint members are provided, which are welded relative to each other on the outside of the steel tube concrete column to form a through T-shaped slot; the web end of the T-shaped restraint member is welded to the supporting steel pipe, and the flange plate is arranged in the T-shaped slot, the width of the T-shaped slot is greater than the thickness of the flange plate, and there is a gap on both sides of the flange plate to allow it to slide radially; after assembly, the combination of the T-shaped restraint member and the L-shaped restraint member provides radial restraint to the supporting steel pipe; the T-shaped restraint member and the L-shaped restraint member can undergo a certain relative sliding, allowing the supporting steel pipe to produce a small strain.

[0013] Preferably, the supporting steel pipes are provided in six groups and are evenly arranged along the circumference of the steel tube concrete column.

[0014] Preferably, the lateral restraints and radial restraints are provided in four layers, which are evenly arranged along the axial direction of the supporting steel pipe.

[0015] The reinforcement method of a steel tube concrete column for a kiln tail according to the present invention is characterized by comprising the following steps:

[0016] (1) Weld the top annular gusset plate to the upper part of the outer side of the original concrete-filled steel tube column, and weld the bottom annular gusset plate to the lower part of the outer side of the column;

[0017] (2) Several supporting steel pipes are evenly arranged around the periphery of the original steel tube concrete column, top head plates are welded to the top of the supporting steel pipes, and several groups of top node ear plates are evenly welded below the top annular node plate. The corresponding top head plates and top node ear plates are hinged by bolts;

[0018] (2) Weld a T-shaped restraint member on the inner side of the supporting steel pipe. The T-shaped restraint member is formed by vertically welding two rectangular steel plates; weld an L-shaped restraint member on the original steel tube concrete column. The L-shaped restraint member is an unequal-leg angle steel. Two L-shaped restraint members are arranged oppositely and welded on the steel tube concrete column. The flange plate of the T-shaped restraint member is restricted in the formed T-shaped groove, and the end of the T-shaped restraint member is limited;

[0019] (3) A lateral restraint is welded on one side of the supporting steel pipe and a connecting lug is welded on the other side. Long round holes for mounting bolts are provided on the connecting lug. The lateral restraint is a circular steel pipe. A gusset plate is welded on the end not welded to the supporting steel pipe. The gusset plate and the connecting lug are hinged by bolts.

[0020] (4) A bottom head plate is welded at the bottom end of the supporting steel pipe, and a middle ring node plate is set on the outside of the original steel tube concrete column. An H-shaped steel support is welded on the middle ring node plate at the corresponding position of the supporting steel pipe. A bottom node ear plate is welded on the top of the H-shaped steel support. The bottom head plate and the bottom node ear plate are hinged by bolts;

[0021] (5) Place several jacks under the middle ring node plate. The jacks are located directly below the support and apply preload to the reinforced structure through the jacks.

[0022] (6) Weld several stiffening ribs between the middle annular node plate and the bottom annular node plate. The stiffening ribs are arranged between adjacent jacks. After all the stiffening ribs are welded, the jacks are removed one by one. At this time, the reinforcement is completed.

[0023] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: 1. It does not damage the original structure and can ensure the safety of the original structure during the reinforcement construction process; 2. It adopts an assembled all-steel structure reinforcement scheme, which has a convenient construction method and low construction difficulty; 3. The stress of the original structural column can be unloaded by applying pre-pressure during the construction process, without the need to dismantle existing equipment, which greatly shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a top plan view of the reinforcement structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the AA section of the reinforced structure;

[0026] Figure 3 It is a schematic diagram of the BB cross section of the reinforcement structure;

[0027] Figure 4 It is a top view of the bottom of the reinforcement structure;

[0028] Figure 5 It is a CC cross-section diagram after the reinforcement structure construction is completed;

[0029] Figure 6 This is a schematic diagram of the DD section after the reinforcement structure construction is completed;

[0030] Figure 7 It is a CC cross-section diagram during reinforcement structure construction. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0032] like Figure 1-6 As shown, a reinforcement structure of a steel tube concrete column for a kiln tail is set based on the steel tube concrete column, including a top annular node plate 101 and a bottom annular node plate 115 fixedly set on the outside of the concrete column, and six groups of supporting steel pipes 102 set on the periphery of the concrete column.

[0033] A top head plate 104 is provided at the top of the supporting steel pipe 102, and the top head plate 104 is welded and fixed to the supporting steel pipe 102; six groups of top node ear plates 103 are evenly provided at the bottom of the top annular node plate 101, and the top node ear plates 103 are welded and fixed to the top annular node plate 101; the top node ear plates 103 and the top head plate 104 are both provided with bolt holes, which are hingedly connected by bolts one by one, so as to realize the connection between the upper end of the supporting steel pipe 102 and the top annular node plate 101.

[0034] A bracket is provided above the bottom annular node plate 115, and the bracket includes a middle annular node plate 114 and a support 112. The middle annular node plate 114 is sleeved on the outside of the concrete column and is welded to the bottom annular node plate 115 through a number of stiffening ribs 116. There are six groups of supports 112, which are welded and fixed above the middle annular node plate 114, corresponding to the support steel pipe 102, and a bottom node ear plate 110 is welded to the top thereof. A bottom head plate 111 is provided at the bottom end of the support steel pipe 102, and the bottom head plate 111 is welded and fixed to the support steel pipe 102. The bottom node ear plate 110 and the bottom head plate 111 are both provided with bolt holes, which are hingedly connected one by one by bolts to realize the connection between the bottom end of the support steel pipe 102 and the bottom annular node plate 115.

[0035] In order to improve the stability of the reinforcement structure, a lateral restraint 107 is provided between two adjacent support steel pipes 102, such as Figure 3 As shown, the lateral restraint 107 is a circular steel tube that connects two adjacent support steel tubes 102. A gusset plate 109 is welded to one end of the lateral restraint 107, which is provided with bolt holes. The other end is welded to one support steel tube 102. Correspondingly, one side of the support steel tube 102 is welded to the lateral restraint 107, and the other side is provided with a connecting lug 108, which is welded to the support steel tube 102 and has oblong holes for mounting bolts. The connecting lug 108 and the gusset plate 109 are hingedly connected by bolts, connecting the upper ends of the support steel tubes 102 to the lateral restraint 107 and allowing the lateral restraint 107 to move relative to the support steel tube 102 under load.

[0036] In order to further improve the stability of the reinforced structure, radial constraints are provided between the supporting steel pipe 102 and the concrete column, such as Figure 3 As shown. The radial restraint includes a T-shaped restraint member 105 and an L-shaped restraint member 106. The T-shaped restraint member 105 is composed of two rectangular steel plates welded vertically, and the end of its web is welded to the supporting steel pipe 102. There are two L-shaped restraint members 106, which are welded to the outside of the concrete column relative to each other to form a through T-shaped slot; the flange plate of the T-shaped restraint member 105 is set in the T-shaped slot, the width of the T-shaped slot is greater than the thickness of the flange plate, and there is a gap on both sides of the flange plate to allow it to slide radially, and the flange plate can slide relative to each other in the T-shaped slot along the radial direction; after assembly, one end of the radial restraint is fixedly connected to the supporting steel pipe 102, and the other end is fixedly connected to the concrete column. The T-shaped restraint member 105 and the L-shaped restraint member 106 can undergo a certain relative sliding, allowing the supporting steel pipe 102 to be subjected to force and produce a small strain; at the same time, due to the small gap, the combination of the T-shaped restraint member 105 and the L-shaped restraint member 106 provides radial restraint to the supporting steel pipe 102 to prevent large radial deformation.

[0037] There are six groups of radial and lateral restraints 107 along the circumference of the concrete column, corresponding to the supporting steel pipes 102; there are four layers along the axial direction of the concrete column, evenly arranged along the supporting steel pipes 102; there are twenty-four groups of radial and lateral restraints 107 each.

[0038] The reinforcement method for the above-mentioned reinforcement structure includes the following steps:

[0039] (1) Weld the top annular gusset plate 101 at the upper position outside the original concrete-filled steel tube column, and weld the bottom annular gusset plate 115 at the lower position outside the column;

[0040] (2) Several supporting steel pipes 102 are evenly arranged around the periphery of the original steel tube concrete column, and a top head plate 104 is welded to the top of the supporting steel pipe 102. The top head plate 104 is welded to the circular head plate at the end of the supporting steel pipe 102; several groups of top node ear plates 103 are evenly welded below the top annular node plate 101, and the corresponding top head plates 104 and top node ear plates 103 are hinged by bolts;

[0041] (3) Weld a T-shaped restraint member 105 on the inner side of the supporting steel pipe 102. The T-shaped restraint member 105 is formed by vertically welding two rectangular steel plates. Weld an L-shaped restraint member 106 on the original steel tube concrete column. The L-shaped restraint member 106 is an unequal-leg angle steel. Two L-shaped restraint members 106 are arranged oppositely and welded on the original steel tube concrete column. The flange plate of the T-shaped restraint member 105 is restricted in the formed T-shaped groove to limit the position of the T-shaped restraint member 105.

[0042] (4) A lateral restraint 107 is welded to one side of the supporting steel pipe 102, and a connecting lug 108 is welded to the other side. An oblong hole for mounting bolts is provided on the connecting lug 108. The lateral restraint 107 is a circular steel pipe, and a gusset plate 109 is welded to the end thereof not welded to the supporting steel pipe 102. The gusset plate 109 and the connecting lug 108 are hingedly connected by bolts.

[0043] (5) A bottom end plate 111 is welded to the bottom end of the supporting steel pipe 102, and the bottom end plate 111 is welded to the circular end plate at the bottom of the supporting steel pipe 102; a middle annular node plate 114 is set on the outside of the original steel tube concrete column, an H-shaped steel support 112 is welded on the middle annular node plate 114 corresponding to the supporting steel pipe 102, and a bottom node ear plate 110 is welded on the top of the H-shaped steel support 112. The bottom end plate 111 and the bottom node ear plate 110 are hinged by bolts;

[0044] (6) Place several jacks 113 under the middle ring node plate 114. The jacks 113 are located directly below the H-shaped steel support 112. The jacks 113 apply preload to the reinforcement structure, such as Figure 7 As shown;

[0045] (7) Several stiffening ribs 116 are welded between the middle annular node plate 114 and the bottom annular node plate 115. The stiffening ribs 116 are arranged between adjacent jacks 113. After all the stiffening ribs 116 are welded, the jacks 113 are removed one by one. At this time, the reinforcement is completed.

[0046] The present invention reinforces the original structure without destroying it, and can ensure the safety of the original structure during the reinforcement construction process; the various reinforcement structures of the present invention are all steel structures, and an assembled full-steel structure reinforcement scheme is adopted, which is fixed by welding and bolts, and the construction method is convenient and the construction difficulty is low; during the construction process, the stress of the original structure column can be unloaded by applying pre-pressure, and there is no need to dismantle existing equipment, which can greatly shorten the construction period, and the construction convenience and economy are high.

Claims

1. A reinforcement structure for steel tube concrete columns at the kiln tail, based on the arrangement of steel tube concrete columns, characterized in that: It includes a top annular node plate and a bottom annular node plate fixedly arranged on the outside of the steel tube concrete column, and a number of supporting steel pipes arranged on the periphery of the steel tube concrete column, the two ends of the supporting steel pipes are respectively connected to the top annular node plate and the bottom annular node plate; a lateral constraint is provided between the supporting steel pipes, and the lateral constraint connects two adjacent supporting steel pipes; a radial constraint is provided between the supporting steel pipe and the concrete column, one end of the radial constraint is fixedly connected to the supporting steel pipe, and the other end is connected to the steel tube concrete column; the upper end of the supporting steel pipe is connected to the top annular node plate through the top node ear plate and the top head plate, and the top node ear plate is welded The top head plate is connected to the bottom of the top annular node plate, the top head plate is welded to the top of the supporting steel pipe, and the top node ear plate and the top head plate are connected by bolts; a bracket is provided between the lower end of the supporting steel pipe and the bottom annular node plate, the bracket is welded to the bottom annular node plate, and includes a bottom node ear plate, and the lower end of the supporting steel pipe is welded with a bottom head plate, and the bottom node ear plate and the bottom head plate are connected by bolts; the bracket includes a middle annular node plate, and the middle annular node plate and the bottom annular node plate are welded together by a number of stiffening ribs, and a support corresponding to the supporting steel pipe is provided on the top of the middle annular node plate, and the bottom node ear plate is welded above the support.

2. The reinforcement structure of the steel tube concrete column for kiln tail according to claim 1 is characterized in that: One end of the lateral restraint is welded with a node plate, and the other end is welded to one side of the supporting steel pipe; a connecting ear plate is provided at the corresponding position on the other side of the supporting steel pipe, and the connecting ear plate and the node plate of the other lateral restraint are connected by bolts.

3. The reinforcement structure of the steel tube concrete column for kiln tail according to claim 2, characterized in that: The connecting ear plate is provided with oblong holes for mounting bolts.

4. The reinforcement structure of the steel tube concrete column for the kiln tail according to claim 2, characterized in that: The radial restraint includes a T-shaped restraint member and an L-shaped restraint member; two L-shaped restraint members are provided, which are welded relative to each other on the outside of the steel tube concrete column to form a through T-shaped slot; the web end of the T-shaped restraint member is welded to the supporting steel pipe, and the flange plate is arranged in the T-shaped slot, the width of the T-shaped slot is greater than the thickness of the flange plate, and there is a gap on both sides of the flange plate to allow it to slide radially; after assembly, the combination of the T-shaped restraint member and the L-shaped restraint member provides radial restraint for the supporting steel pipe.

5. The reinforcement structure of the steel tube concrete column for kiln tail according to claim 4, characterized in that: The supporting steel pipes are provided in six groups and are evenly arranged along the circumference of the steel tube concrete column.

6. The reinforcement structure of the steel tube concrete column for kiln tail according to claim 4, characterized in that: The lateral restraints and radial restraints are provided in four layers and are evenly arranged along the axial direction of the supporting steel pipe.

7. A method for reinforcing a structure according to claim 4, characterized in that: The following steps are involved: (1) Weld the top annular gusset plate to the upper part of the outer side of the original concrete-filled steel tube column, and weld the bottom annular gusset plate to the lower part of the outer side of the column; (2) Several supporting steel pipes are evenly arranged around the periphery of the original steel tube concrete column, top head plates are welded to the top of the supporting steel pipes, and several groups of top node ear plates are evenly welded below the top annular node plate. The corresponding top head plates and top node ear plates are hinged by bolts; (2) Weld a T-shaped restraint member on the inner side of the supporting steel pipe. The T-shaped restraint member is formed by vertically welding two rectangular steel plates; weld an L-shaped restraint member on the original steel tube concrete column. The L-shaped restraint member is an unequal-leg angle steel. Two L-shaped restraint members are arranged oppositely and welded on the steel tube concrete column. The flange plate of the T-shaped restraint member is restricted in the formed T-shaped groove to limit the position of the T-shaped restraint member; (3) A lateral restraint is welded on one side of the supporting steel pipe and a connecting lug is welded on the other side. Long round holes for mounting bolts are provided on the connecting lug. The lateral restraint is a circular steel pipe. A gusset plate is welded on the end not welded to the supporting steel pipe. The gusset plate and the connecting lug are hinged by bolts. (4) A bottom head plate is welded at the bottom end of the supporting steel pipe, and a middle ring node plate is set on the outside of the original steel tube concrete column. An H-shaped steel support is welded on the middle ring node plate at the corresponding position of the supporting steel pipe. A bottom node ear plate is welded on the top of the H-shaped steel support. The bottom head plate and the bottom node ear plate are hinged by bolts; (5) Place several jacks under the middle ring node plate. The jacks are located directly below the support and apply preload to the reinforced structure through the jacks. (6) Weld several stiffening ribs between the middle annular node plate and the bottom annular node plate. The stiffening ribs are arranged between adjacent jacks. After all the stiffening ribs are welded, the jacks are removed one by one. At this time, the reinforcement is completed.

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