JP2010112079A - Foundation pedestal repair method and repair apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a repair work period of a foundation pedestal for a blast furnace or the like. <P>SOLUTION: This repair method of the foundation pedestal provided with an added portion on the upper face of a foundation part includes steps of: integrating equipment tie-in hardware installed on the upper face of the added portion, and a foundation reinforcement for reinforcing the added portion, in a location other than the installation location of the foundation pedestal; installing the integrated equipment tie-in hardware and foundation reinforcement in the upper part of the foundation part; and filling the upper face of the foundation part with a material hardened with the lapse of time, to embed the equipment tie-in hardware and the foundation reinforcement. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and apparatus for repairing a basic pedestal that supports a furnace body of a blast furnace, for example.

  In a blast furnace at a steelworks, work is required to repair heat-resistant bricks that have deteriorated due to long-term use. In this repair work, the furnace installed on the foundation pedestal is dismantled and the refractory bricks are replaced. In addition, in this application, the part used as the base stand which supports heavy objects, such as a furnace body, in various facilities, such as a blast furnace, is called a "base pedestal."

  Along with such repair work, repair work on the deteriorated basic pedestal is carried out. In this renovation work, the volume of the blast furnace may be increased at the same time in order to improve production efficiency and increase production. In this case, as a method of expanding the volume of the blast furnace while diverting the existing blast furnace part, a method of cutting the upper part of the basic pedestal of the blast furnace and extending the furnace body downward is known. Yes. In addition, when the upper part of the foundation pedestal of the blast furnace is cut in this way, an additional part equipped with equipment fittings for supporting the furnace body and reinforcing reinforcement for the foundation on the upper surface of the cut foundation pedestal (foundation part) Renovation work to establish

  Here, the repair work of the basic pedestal of the blast furnace, which has been generally performed conventionally, will be described with reference to FIG. The basic pedestal 100 shown in FIG. 1 has a structure in which an additional portion 111 is provided on the upper surface of the basic portion 110. The foundation portion 110 is, for example, a foundation pedestal that has deteriorated due to long-term use, or a portion obtained by cutting the upper portion of the foundation pedestal of the blast furnace before repair. On the boundary surface between the base portion 110 and the additional portion 111, a plurality of scissor anchors 112 for preventing slippage are vertically installed. Further, a reinforcing bar 115 for reinforcement as a reinforcing material is provided inside the additional portion 111, and an equipment fitting 116 for supporting the furnace body is installed on the upper surface of the additional portion 111. The equipment fitting hardware 116 is fixed by an anchor 117 embedded in the additional portion 111. The repair work of the foundation pedestal 100 is performed by sequentially installing the reinforcing bar anchor 112, the foundation reinforcing bar 115, and the equipment fitting hardware 116 on the site in the upper part of the foundation part 110, and then, for example, concrete or grout that becomes the additional part 111 This is done by pouring a time-hardening material.

  On the other hand, Japanese Patent Application Laid-Open No. 2003-105972 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2003-49543 (Patent Document 2) are disclosed as methods for repairing without using the scissors anchor 112. In Patent Document 1, there is proposed a concrete joining method in which polymer cement is interposed between joining surfaces of old concrete and new concrete to serve as an adhesive to bond old concrete and new concrete. Further, Patent Document 2 proposes a concrete repair method in which a water jet is jetted onto an existing concrete structure to remove deteriorated surface concrete and repair is performed with mortar or the like.

JP 2003-105972 A JP 2003-49543 A

  However, in the repair work of the basic pedestal 100 shown in FIG. 1, the operation of the blast furnace is naturally impossible during this work period. In addition, a large number of basic rebars 115 and equipment fittings 116 must be installed at the repair work site, resulting in a problem that the construction period becomes longer. Therefore, it is required to adopt a construction method that can shorten the repair work period.

  In addition, when the concrete casting method described in Patent Document 1 is applied to a structure having a large area such as a basic pedestal of a blast furnace, it takes a lot of time to apply and works within the usable time of the polymer. Has the problem of being difficult. Moreover, there is a possibility that a sufficient adhesion effect cannot be expected due to dust or the like adhering to the surface.

  Further, the concrete repair method described in Patent Document 2 does not disclose how much unevenness treatment is preferably applied to the existing concrete structure for the repair.

  The main object of the present invention is to shorten the repair period of a basic pedestal such as a blast furnace.

  According to the present invention, there is provided a method for repairing a foundation pedestal in which an additional portion is provided on the upper surface of the foundation portion, the equipment fitting hardware installed on the upper surface of the additional portion, and a reinforcing bar for foundation for reinforcing the additional portion, The step of integrating at a place other than the installation location of the foundation pedestal, the step of installing the integrated fitting metal fitting and the foundation rebar above the foundation portion, the fitting metal fitting and the basic reinforcement A method of repairing a foundation pedestal, comprising the step of filling the upper surface of the foundation portion with an age-hardening material.

  In this repair method, a step of roughening the upper surface of the base portion may be provided before the step of filling the upper surface of the base portion with the time-hardening material. In the step of roughening the upper surface of the foundation portion, a groove having a depth of 1 mm or more and 20 mm or less may be formed on the entire upper surface of the foundation portion. Moreover, the said foundation part cut | disconnects the upper part of the existing foundation pedestal, for example. The basic pedestal is, for example, a basic pedestal of a blast furnace.

  Further, according to the present invention, there is provided a repair device for a basic pedestal that provides an additional portion on the upper surface of the base portion, the equipment fitting installed on the upper surface of the additional portion, and a reinforcing bar for foundation that reinforces the additional portion, There is provided a repair device comprising: a support body that integrally supports the base pedestal; and a moving mechanism that moves the support body from a place other than a place where the base pedestal is installed above the base portion.

  In this repair device, the support body and the moving mechanism may be removed after the equipment fitting hardware and the foundation rebar are installed at a desired position, and may be transported out from the foundation pedestal.

  According to the present invention, the repair work period of the basic pedestal can be shortened. Thereby, the operation stop period can be shortened in various industrial facilities such as a blast furnace, and productivity can be improved.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  FIG. 2 is an explanatory diagram of the foundation pedestal 1 to which the repair method according to the embodiment of the present invention has been applied. The foundation pedestal 1 is a part that serves as a foundation for supporting heavy objects such as a furnace body and various devices in various facilities. For example, the foundation pedestal is a part that serves as a foundation for supporting a furnace body in a blast furnace at a steelworks. The foundation pedestal 1 has a structure in which an additional portion 11 is provided on the upper surface of the foundation portion 10. The foundation portion 10 is, for example, an existing foundation pedestal or a cut portion of an existing foundation pedestal.

  The additional portion 11 has a structure in which a time-hardening material 15 such as concrete, grout, mortar, or the like is hardened in a state where a reinforcing bar 12 as a reinforcing material and an anchor 14 of an equipment fitting 13 are embedded therein. The equipment fitting 13 is installed on the upper surface of the additional portion 11 and fixed by an anchor 14 embedded in the additional portion 11 (in the time-hardening material 15). For the sake of explanation, the boundary between the basic pedestal 10 and the additional portion 11 is defined as a boundary surface 16.

  FIG. 3 is a schematic view of the repair device 20 according to the embodiment of the present invention. The repair device 20 has a support 22 supported by a moving mechanism 21. For example, a chill tank is used as the moving mechanism 21, and the support 22 can be easily moved on the ground. The support 22 has a prefabricated structure formed by combining, for example, steel frames and can be disassembled. The support 22 is supported by the moving mechanism 21 via the jack portion 23, and the height of the support 22 can be arbitrarily set.

  When repair work is performed using the repair device 20, first, in a place other than the place where the foundation pedestal 1 is installed, the equipment joint hardware 13 and the foundation rebar 12 are attached to the lower surface of the support 22 via the suspension member 24. Are attached together. In this case, the equipment fitting 13 can be detachably attached to the suspension member 24 by, for example, bolting. Further, the foundation reinforcing bar 12 is welded to the anchor 14 of the equipment fitting metal 13, and the equipment fitting 13 and the foundation reinforcing bar 12 are integrated.

  On the other hand, in the foundation pedestal 1, a roughening process is performed on the upper surface of the foundation portion 10. As the roughening treatment, a method of roughening the upper surface of the base portion 10 using a bit roller or a water jet is used. The depth of the groove to be formed is preferably 1 mm or more and 20 mm or less. When the depth is lower than 1 mm, sufficient frictional force cannot be obtained, and when the depth is larger than 20 mm, the processing takes time and the cost increases.

  And after performing a roughening process to the upper surface of the foundation part 10, the support body 22 is moved to the installation position of the foundation pedestal 1, and the integrated equipment fitting 13 and the reinforcement for foundation 12 are made into the foundation part 10's. Move upward. In this case, by moving the support 22 on the ground using the moving mechanism 21 such as a chill tank, the equipment fitting 13 and the reinforcing bar 12 can be easily moved above the base portion 10. Moreover, by operating the jack part 23 of the repairing apparatus 20, the height of the support body 22 can be adjusted arbitrarily, and thereby the height of the equipment fitting 13 and the foundation reinforcing bar 12 is set to a desired height. be able to.

  In this way, after the equipment fitting 13 and the foundation rebar 12 are arranged at a predetermined position above the foundation part 10, the time-dependent hardening is performed on the upper surface of the foundation part 10 so that the equipment fitting 13 and the foundation rebar 12 are embedded. Fill material 15. For example, concrete, grout, mortar, or the like is used as the time-hardening material.

  Then, after the installation alloy 13 and the foundation reinforcing bar 12 are installed, the suspension member 24 is cut, and the support 22 is separated from the unusable portion 11. Thus, the additional portion 11 is formed by curing the time-curable material 15.

  The repair work for the basic pedestal 1 will be carried out through the process described above. The work of integrating the equipment fitting 13 and the foundation rebar 12 and suspending them from the lower surface of the support 22 can be performed in advance before the repair work of the foundation pedestal 1 is started. For this reason, during the work period in which the equipment fitting 13 and the foundation rebar 12 are integrated and suspended on the lower surface of the support 22, various industrial equipment having the foundation pedestal 1 can be used, and the equipment shutdown time can be reduced. Can be shortened. For this reason, the repair work period of the foundation pedestal 1 can be substantially shortened, and the production efficiency can be improved.

  In addition, by applying a roughening process to the upper surface of the base portion 10 before forming the additional portion 11, the additional portion 11 comes into close contact with the upper surface of the base portion 10. The occurrence of a decrease in shear strength at the boundary surface 16 of the additional portion 11 is suppressed. In addition, as a conventional method for preventing a decrease in shear strength, a method of providing a bar anchor in the vertical direction has been implemented. However, this roughening treatment eliminates the trouble of providing a bar anchor. The construction period can be shortened.

  Moreover, after the additional part 11 is formed, the support body 22 cut off from the equipment fitting 13 can be easily moved from the installation location of the basic pedestal 1 using the moving mechanism 21 and can be quickly removed. . In addition, since the support body 22 consists of a prefabricated structure etc., it is also possible to disassemble and remove in the installation location of the foundation pedestal 1.

  Here, in this invention, it can utilize suitably for the repair work accompanying the volume expansion of the blast furnace of a steelworks. Therefore, the case where the repair method according to the embodiment of the present invention is applied to the basic pedestal of the blast furnace at the ironworks will be described below.

  4A and 4B are schematic views of the blast furnace 30, in which FIG. 4A shows a state before the repair work, and FIG. 4B shows a state after the repair work. FIG. 5 is an explanatory diagram of the repair process of the basic pedestal 1 of the blast furnace 30. FIG. 5 is an explanatory diagram of the repair process of the blast furnace foundation structure 40. (A) has shown the basic pedestal 1 before repair. (B) has shown the state by which the upper part of the foundation pedestal 1 was cut | disconnected. (C) has shown the state by which the reinforcing bar 12 for foundations and the fixture metal fitting 13 were installed above the foundation pedestal 1 (base part 10) by which the upper part was cut | disconnected. (D) shows a state in which the time-hardening material 15 is placed on the upper surface of the base portion 10 to form the additional portion 11.

  The blast furnace 30 has a configuration in which a furnace body 31 is supported on the basic pedestal 1 and a saddle portion 32 is constructed around the furnace body 31. When the volume of the furnace body 31 is expanded by the renovation work of the blast furnace 30, the height of the foundation pedestal 1 is set before renovation shown in FIG. 4 (a) so that the existing saddle portion 32 can be used as it is even after refurbishment. Compared to the state of FIG. 4, as shown in FIG.

  First, before renovation work, as shown in FIG. 5A, the foundation pedestal 1 is still in a relatively high state. Then, as shown in FIG.5 (b), first, the upper part of the existing foundation pedestal 1 is cut | disconnected.

  And the roughening process is performed with respect to the upper surface of the foundation pedestal 1 (foundation part 10) by which the upper part was cut | disconnected in this way. A bit roller, a water jet or the like is used for the roughening process.

  On the other hand, in a place other than the place where the foundation pedestal 1 is installed, the equipment fitting 13 and the foundation rebar 12 are integrally attached to the support 22 of the repair device 20 via the suspension member 24. And the support body 22 is moved to the installation position of the foundation pedestal 1, and as shown in FIG.5 (c), the integrated equipment fitting 13 and the reinforcement | strengthening reinforcement 12 move above the foundation part 10. As shown in FIG. Be made. In addition, the operation | work which attaches the installation metal fitting 13 and the foundation reinforcement 12 integrally to the support body 22 of the repair apparatus 20 can be previously performed before repair work of the foundation pedestal 1 is performed. In addition, while cutting the upper part of the foundation pedestal 1 or performing a roughening process on the upper surface of the foundation part 10, the equipment fitting 13 and the foundation rebar 12 are attached to the support 22 of the repair device 20. Installation work may be performed.

  Then, after the equipment fitting 13 and the foundation rebar 12 integrated above the foundation part 10 are arranged in this manner, the equipment fitting 13 and the foundation rebar 12 are embedded so that the foundation part 10 is embedded. A time-hardening material 15 is filled on the upper surface.

  Thus, the additional portion 11 is formed, and then the suspension member 24 is cut and the support 22 is separated from the additional portion 11. In addition, the support body 22 can be easily removed from the installation location of the basic pedestal 1 using the moving mechanism 21, and can also be disassembled and removed at the installation location of the basic pedestal 1.

  As described above, the height of the foundation pedestal 1 is made relatively lower than that before the refurbishment, and the furnace body 31 is extended downward. Can be expanded.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  In the above, the renovation work in the blast furnace has been mainly explained. However, the application example of the present invention is not limited to this. For the part (foundation pedestal) that serves as a base for supporting heavy objects in rolling equipment and other various industrial equipment The present invention can be applied. In addition, as the time-hardening material filled on the upper surface of the base portion, a time-hardening material other than concrete, grout, mortar, or the like can be used.

  In addition to the chill tank, the moving mechanism 21 that moves the support 22 of the repair device 20 may be configured to support and move the support 22 on a previously installed rail, for example.

  As an example of the present invention, a shearing experiment for confirming the effect of the roughening treatment was performed. FIG. 6 is a schematic diagram of the shear experiment apparatus 50 used in the example. The shear experiment apparatus 50 includes a mounting table 52 for fixing the test body 51, a vertical force applying unit 53 that applies a force to the test body 51 in the vertical direction, and an upper and lower horizontal force that applies a force to the test body 51 in the horizontal direction. Force portions 54a and 54b are provided. Here, the test body 51 is divided into an upper part (additional part 11) and a lower part (basic part 10), and two kinds of materials are placed thereon. The upper horizontal force portion 54a and the lower horizontal force portion 54b apply equal forces in opposite directions to the upper portion (additional portion 11) and the lower portion (base portion 10). In FIG. 6, the horizontal force applying portion 54a applies force from left to right in the drawing, and the horizontal force applying portion 54b applies force from right to left in the drawing.

  The shear experiment was performed in the shear experiment apparatus 50 configured as described above. As the test body 51, the former foundation concrete mockup and the lower part cast as high fluid concrete were taken as Examples 1 to 3, the upper part was Essaber (high fluid mortar for cement-based filling), and the lower part was high fluid concrete. Was placed as Example 4. The trial conditions of Examples 1 to 4 are shown in Table 1 below.

  Table 2 shows the results of a shearing experiment using Examples 1 to 4 shown in Table 1.

In FIG. 7, based on the result of Table 2, what plotted the maximum shear stress (N / mm < ² >) of each Examples 1-4 in a shear experiment is shown. As shown in FIG. 7, the maximum shear stress in the cases of Examples 1 to 3 subjected to the roughening treatment is extremely large as compared with the case of Example 4, and in particular, roughening using a water jet. The surface treatment was found to be effective.

  The present invention can be applied to, for example, a repair method and a repair device for an equipment foundation pedestal such as a foundation structure of a blast furnace.

It is explanatory drawing of the repair work of the conventional basic pedestal 100. FIG. It is explanatory drawing of the foundation pedestal 1 in which the repair method concerning embodiment of this invention was given. It is the schematic of the repair apparatus 20 concerning embodiment of this invention. (A) is an overview of the blast furnace 30 before the renovation work, and (b) is an overview of the blast furnace 30 after the renovation work. (A) is explanatory drawing of the blast furnace foundation structure 40 after removing the furnace body 31 of a blast furnace. (B) is explanatory drawing which shows a mode that the upper part of the blast furnace foundation structure 40 was cut | disconnected in repair work. (C) is explanatory drawing which shows a mode that the reinforcement | strengthening reinforcement 12 and the equipment fitting 13 which were integrated in the other place in the predetermined position above the cut | disconnected blast furnace foundation structure 40 are installed by the support body 22. FIG. It is. (D) is explanatory drawing which shows a mode that the concrete was laid and the additional part 11 was formed so that the reinforcing bar 12 for foundations and the installation metal fitting 13 installed in the predetermined position might be embed | buried. 1 is a schematic diagram of a shear experiment apparatus 50. FIG. The maximum shear stress (N / mm < ² >) of Examples 1-4 is graphed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Foundation pedestal 10 ... Foundation part 11 ... Additional part 12 ... Reinforcing bar 13 ... Equipment fitting 14 ... Anchor 15 ... Aging hardening material 16 ... Interface 20 ... Repair device 21 ... Moving mechanism 22 ... Support body 23 ... Jack Section 24 ... Suspension member 30 ... Blast furnace 31 ... Furnace body 32 ... Saddle part 40 ... Blast furnace basic structure 50 ... Shear experimental device 51 ... Test body 52 ... Mounting base 53 ... Vertical force application parts 54a, 54b ... Horizontal force application part

Claims (7)

A method for repairing a foundation pedestal in which an additional part is provided on the upper surface of the foundation part,
Integrating the equipment fitting hardware installed on the upper surface of the additional part and the foundation reinforcing bar that reinforces the additional part at a place other than the installation place of the basic pedestal;
A step of installing the integrated equipment fitting and the foundation reinforcing bar above the foundation part;
A method of repairing a foundation pedestal, comprising a step of filling the upper surface of the foundation portion with an age-hardening material so as to embed the fitting metal fitting and the foundation reinforcing bar. The method for repairing a foundation pedestal according to claim 1, further comprising a step of roughening the upper surface of the foundation portion before the step of filling the upper surface of the foundation portion with a time-hardening material. The method of repairing a foundation pedestal according to claim 2, wherein in the step of roughening the upper surface of the foundation portion, a groove having a depth of 1 mm or more and 20 mm or less is formed on the entire upper surface of the foundation portion. The said foundation part is the repair method of the foundation pedestal in any one of Claims 1-3 which cut | disconnects the existing foundation pedestal or the upper part of the existing foundation pedestal. The method of repairing a basic pedestal according to any one of claims 1 to 4, wherein the basic pedestal is a basic pedestal of a blast furnace. A foundation pedestal refurbishment device that provides an additional part on the upper surface of the foundation part,
A support body that integrally supports the fitting metal fitting installed on the upper surface of the additional portion and a reinforcing bar for reinforcing the additional portion;
A repair device comprising: a moving mechanism for moving the support body from a place other than a place where the foundation pedestal is installed above the foundation part. The said support body and the said moving mechanism are the repair apparatuses of Claim 6 which can be removed after installing the equipment fitting metal fitting and the foundation reinforcement in a desired position, and can be carried out from the foundation pedestal outside.

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