JP2015071892A - Repairing method of structure with change of support height - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly repair a support structure for supporting a supported body in a short time, when a height dimension of the supported body is changed and an installation top end level of the supported body is not changed.SOLUTION: A grout 140 is placed between a rail 100 and an existing concrete foundation 112 in the formwork, while a base plate 130, a rebar 133 and an anchor 134 are disposed in a formwork, after chipping an upper surface of a concrete foundation 112. The grout 140 has a self-flowing flow value while the rebar 133 and the anchor 134 are disposed, and has a strength equal to or higher than that of concrete.

Description

  The present invention relates to a method for repairing a support structure including a concrete foundation that supports a supported body when the height dimension of the supported body is changed and the installation top end level of the supported body is not changed. .

  The coke factory of the steelworks is provided with a coke oven in which an A furnace and a B furnace are arranged with a coal tank interposed therebetween. A rail extending in the longitudinal direction of the coke oven is disposed on the top of the coke oven, and the charging vehicle travels on the rail. Then, the coal stored in the coal tank is charged into the A furnace or B furnace from the charging vehicle, and is carbonized in the carbonization chamber of the A furnace or B furnace to become coke.

  FIG. 11 is a cross-sectional view schematically showing the configuration of the rail 100 described above and the support structure 110 that supports the rail, particularly on the coal tank. The rail 100 is supported by the support structure 110. The support structure 110 includes a steel stringer 111 that supports the lower surface of the rail 100 and a concrete foundation 112 that further supports the stringer 111. A leveling material 114 that finely adjusts the parallelism and height of the stringer 111 (rail 100) is provided between the stringer 111 and the concrete foundation 112 via a base plate 113.

  Various materials are used for the leveling material 114. For example, Patent Document 1 proposes using a grout. Patent Document 2 proposes to use a hydraulic mortar prepared by kneading a self-leveling hydraulic composition and water as a leveling material having good construction workability and curability. .

JP 60-102428 A JP 2011-214290 A

  By the way, for the purpose of reducing the life cycle cost and the initial investment amount, the type of rail may be changed when the rail 100 is repaired. Further, along with the change of the type (standard) of the rail, the dimension H1 in the height direction of the rail 100 shown in FIG. 11 may be changed. In such a case, the height L1 of the upper surface of the rail 100 is considered in consideration of the connection with the charging vehicle and the equipment on the upper part of the coke oven, and further with the existing rail before and after the repair range (the existing rail on the A furnace or B furnace). Cannot be changed. For this reason, it is necessary to change the height L2 of the lower surface of the rail 100, that is, the support height L2 that supports the rail 100 in the support structure 110, and to absorb the dimensional difference of the dimension H1 due to the change of the rail 100. Specifically, for example, the rail 100 before the replacement shown in FIG. 11 (hereinafter sometimes referred to as the old rail 100a) is a 74 kg rail and the dimension H1 is 105 mm, whereas the rail 100 after the replacement shown in FIG. When the rail 100 (hereinafter may be referred to as a new rail 100b) is a 73 kg rail and the dimension H1 is 135 mm, the support height L2 of the support structure 110 needs to be lowered by 30 mm of the dimension difference.

  Therefore, the inventors tried to use the steel string structure similar to the conventional one in order to change the support height L2 of the support structure 110 in this way. However, in such a case, since there is a manufacturing limit in the processing size of the steel stringer 111, in order to absorb the dimensional difference of the dimension H1 of the rail 100, as shown in FIG. It was found that it was necessary to beat and remove the shaded area in FIG. In such a case, it takes a lot of time for the turning work, and the support structure 110 cannot be repaired efficiently. In particular, when repairing a place that directly affects product productivity, such as a coke oven, for example, it is required to perform repair in a short time in synchronization with the repair and maintenance of other operating equipment. Repair using a stringer structure is not suitable.

  For example, the leveling material 114 described in Patent Documents 1 and 2 cannot be used to adjust the support height L2 of the support structure 110. As shown in FIG. 12, a distance H2 between the support height L2 of the support structure 110 after repair and the height L3 of the upper surface of the existing concrete foundation 112 is, for example, 185 mm. Since the leveling material 114 has a low tensile strength and cannot function as a structure that supports the rail 100, the leveling material 114 is placed in a large space (space of 185 mm in the height direction) between the rail 100 and the concrete foundation 112. Not applicable. For this reason, the support structure 110 cannot be repaired using the leveling material 114.

  The present invention has been made in view of such points, and a support structure that supports a supported body when the height of the supported body is changed and the installation top end level of the supported body is not changed. The purpose is to repair the body properly in a short time.

  To achieve the above object, the present invention comprises a concrete foundation that supports a supported body when the height of the supported body is changed and the installation top level of the supported body is not changed. A method of repairing a support structure, characterized in that a grout is placed between the supported body and the existing concrete foundation in a state where reinforcing bars are disposed.

  According to the present invention, after the mold is provided outside the supported body and the existing concrete foundation, and the reinforcing bars are disposed in the mold, the mold is disposed between the supported body and the existing concrete foundation. Placing a grout. In such a case, it is not necessary to scoop the upper part of the existing concrete foundation as compared with the case of using a steel stringer structure as in the conventional case, and the grout hardens in a short time, so that the support structure is repaired in a short time. be able to. Further, since the position in the height direction of the object to be processed is adjusted only by placing the grout in a state where the object to be supported is fixed, it is possible to easily cope with the height fluctuation of the object to be supported. Furthermore, a reinforcing bar is disposed inside the grout, that is, the grout functions as a structure for supporting the object to be processed, so that the object to be supported can be supported appropriately. As described above, according to the present invention, the support structure can be repaired efficiently and appropriately in a short time.

  In addition, in order to improve the adhesiveness between the existing concrete foundation and the grout, the upper surface of the existing concrete foundation may be beaten before placing the grout. However, this rolling work is about the rough surface of the upper surface of the existing concrete foundation, and the working time is extremely short compared to the conventional case where the upper end of the existing concrete foundation is beaten deeper. it can.

  It is preferable that the grout has a flow value that self-flows in a state where the reinforcing bars are disposed and has a strength equal to or higher than that of concrete.

  A fiber material may be mixed in the grout.

  The grout may have a granulated slag.

  The supported body may be a rail, and a mixer for generating the grout may be moved to a placement position, and the grout generated by the mixer may be continuously placed.

  ADVANTAGE OF THE INVENTION According to this invention, when the support height of a to-be-supported body is changed, the support structure which supports the said to-be-supported body can be repaired efficiently and appropriately in a short time.

It is a top view which shows the outline of a structure of a coke oven. It is a side view which shows the outline of a structure of a coke oven. It is explanatory drawing in the cross sectional view which shows a mode that the upper surface of the existing concrete foundation was rolled up. It is explanatory drawing in planar view which shows a mode that the upper surface of the existing concrete foundation was rolled up. It is explanatory drawing in sectional view which shows a mode that the rail, the template, the reinforcing bar, and the anchor were arrange | positioned in the formwork. It is explanatory drawing in planar view which shows a mode that the rail, the template, the reinforcing bar, and the anchor were arrange | positioned in the formwork. It is explanatory drawing in the cross sectional view which shows a mode that grout is laid in a formwork. It is explanatory drawing in planar view which shows a mode that grout is laid in a formwork. It is explanatory drawing in the cross sectional view which shows a mode that the support structure was repaired. It is explanatory drawing in planar view which shows a mode that the support structure was repaired. It is explanatory drawing in the cross sectional view which shows the existing rail and support structure. It is explanatory drawing in sectional view which shows a mode that the support structure was repaired using the conventional steel stringer structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a plan view showing the outline of the configuration of the coke oven 1, and FIG. 2 is a side view showing the outline of the configuration of the coke oven 1. The coke oven 1 is provided with an A furnace 11 and a B furnace 12 with a coal tank 10 interposed therebetween. 1 and 2, each of the coal tank 10, the A furnace 11, and the B furnace 12 is illustrated one by one, but actually, in the longitudinal direction of the coke oven 1 (X direction in the figure). Each of them is arranged side by side.

  A pair of rails 100 and 100 as support bodies extending in the longitudinal direction of the coke oven 1 are disposed in the short direction (Y direction in the drawing) at the top of the coke oven 1. A charging vehicle 101 travels along the rail 100 along the rail 100. Then, the coal stored in the coal tank 10 is charged into the A furnace 11 or the B furnace 12 from the charging vehicle 101, and is dry-distilled in a carbonization chamber (not shown) of the A furnace 11 or the B furnace 12 to obtain coke. Become.

  In the following description, the term “longitudinal direction” refers to the longitudinal direction of the coke oven 1 and the X direction in the figure. Further, the “short direction” refers to the short direction of the coke oven 1 and the Y direction in the figure.

  In the present embodiment, a case where the support structure of the rail 100 disposed on the coal tank 10 is repaired in the coke oven 1 will be described. Specifically, when the old rail 100a shown in FIG. 11 is replaced with the new rail 100b shown in FIG. 12, that is, when the dimension H1 in the height direction of the rail 100 is changed from 105 mm to 135 mm, The case where the support structure 110 which supports the rail 100 is repaired is demonstrated. In the present embodiment, the support height L2 for supporting the rail 100 with the support structure 110 after repair is the same as that shown in FIG. That is, the distance H2 between the support height L2 and the height L3 of the upper surface of the concrete foundation 112 is 185 mm.

  In repairing the support structure 110, first, the existing old rail 100a shown in FIG. 11 is removed, and the stringer 111, the base plate 113, and the leveling material 114 are removed. And only the existing concrete foundation 112 is left as shown in FIG.

  Thereafter, as shown in FIGS. 3 and 4, the upper surface of the concrete foundation 112 is rolled up, and a turned area 112 a is formed on the upper surface of the concrete foundation 112. The turning region 112a extends in the longitudinal direction along the rail 100 disposed in the subsequent operation. Further, the range in the short direction of the turning region 112a is a range where a grout is placed as will be described later.

  Thereafter, as shown in FIGS. 5 and 6, the mold 120 is installed on both outer sides of the turning region 112 a in the short direction. The mold 120 is provided by extending along the longitudinal direction of the turning region 112a.

  Thereafter, the rail 100 and the base plate 130 that supports the rail 100 are installed at predetermined positions in the mold 120. The base plate 130 extends along the longitudinal direction of the rail 100. A plurality of support members 131 for fixing the base plate 130 and the rail 100 are arranged in the longitudinal direction of the base plate 130 on the upper surface of the base plate 130. Further, a plurality of whisker muscles 132 for integrating the base plate 130 and a grout described later are attached to the lower surface of the base plate 130 in the longitudinal direction of the base plate 130.

  In the mold 120, a reinforcing bar 133 and an anchor 134 are further installed. The reinforcing bars 133 are arranged extending in the longitudinal direction of the rail 100. The anchor 134 is an anchor for integrating an existing concrete foundation 112 and a grout, which will be described later, and is inserted into a turning area 112 a of the concrete foundation 112. A plurality of anchors 134 are provided side by side in the longitudinal direction of the turning region 112a. As the anchor 134, for example, a chemical anchor or a mechanical anchor is used.

  After that, as shown in FIGS. 7 and 8, the grout 140 is placed on the turning area 112 a in the mold 120.

Here, the grout 140 used in the present embodiment will be described. The grout 140 is made of a material that can be used even in an environmental atmosphere in the coal tank 10 of the coke oven 1, for example, a high temperature atmosphere of 35 ° C. In addition, the grout 140 is made of a material that can be self-filled (self-leveling) in a state where the base plate 130, the barb 132, the reinforcing bar 133, and the anchor 134 are disposed in the mold 120 as described above. As a result of intensive studies by the inventors, it has been found that the flow value of the grout 140 may be 20 cm or more so that the grout 140 can be self-filled. Further, the grout 140 is made of a material having a strength equal to or higher than that of concrete. That is, the grout 140 has a strength of 24 N / mm ² or more after 1 hour from placing.

  Specifically, the grout 140 is produced by kneading granulated slag, water and organic fibers. The granulated slag is slag that has been quenched by, for example, injecting pressure water into molten slag generated in a blast furnace at an ironworks, and the molten slag is reused. The organic fiber is used as a measure for preventing thermal cracking of the grout 140. As a result of intensive investigations by the inventors, by mixing 1.0 g / kg (the amount of organic fiber per 1 kg of grout) of organic fiber in a weight ratio with respect to grout 140, the above-mentioned function for preventing thermal cracking is sufficiently exerted. I found out that

  The grout 140 is produced by kneading the above-mentioned granulated slag, water and organic fibers with the mixer 150 shown in FIG. 8 and is placed in the mold 120 via a chute 151 attached to the mixer 150. As shown in FIG. 7, the grout 140 has a space between the base plate 113 and the upper surface of the concrete foundation 112, that is, a distance H2 between the support height L2 of the rail 100 and the height L3 of the upper surface of the concrete foundation 112. The space is filled. At this time, since the grout 140 self-flows, the grout 140 is appropriately filled in the large space.

  As shown in FIG. 8, a moving mechanism 152 that moves the mixer 150 in the horizontal direction (X direction and Y direction in the figure) is attached to the mixer 150.

  Conventionally, the grout produced by the mixer has been transported and placed in, for example, a bucket. In such a case, it took a long time from the generation of the grout to placement, and the efficiency was poor. In addition, when a large amount of grout is placed as in the present embodiment, the grout may be hardened while being transported with a bucket.

  In this regard, in the present embodiment, the mixer 150 can be quickly moved to the placement location by the moving mechanism 152 and is directly placed using the chute 151. For this reason, it is possible to shorten the time from the generation of the grout 140 to the placement thereof. Further, since the grout 140 can be continuously driven, the grout 140 is not hardened during the driving.

  Further, the longitudinal range in which the grout 140 is placed is as long as about 10 m. Therefore, in practice, the placement range is divided in the longitudinal direction, and the grout 140 is placed from the mixer 150 in each range (for example, R1 and R2 in the figure). Even in such a case, the grout 140 can be continuously driven by moving the mixer 150 in the longitudinal direction by the moving mechanism 152.

  Thereafter, as shown in FIGS. 9 and 10, after the grout 140 is cured after a predetermined time, the mold 120 is removed. Thus, the repair of the support structure 110 is completed.

  According to the above embodiment, after grinding the upper surface of the concrete foundation 112, the grout 140 is driven into the mold 120 with the base plate 130, the reinforcing bars 133 and the anchors 134 disposed in the mold 120. Set up. In this case, when repairing the support structure 110 using the steel stringer structure shown in FIG. 12, it was necessary to scoop deeper than the position of the upper end of the existing concrete foundation 112. In this form, the working time can be significantly shortened because the surface of the concrete foundation 112 may be roughened. Moreover, the grout 140 is cured in a short time. Therefore, the support structure 110 can be repaired in a very short time. When the inventors specifically repaired the support structure 110, it took about 16 hours to repair the support structure 110 using the steel stringer structure shown in FIG. In the embodiment, the support structure 110 could be repaired in about 8 hours.

  Moreover, since the position in the height direction of the rail 100 is adjusted only by driving the grout 140 in a state where the rail 100 is fixed to the base plate 130, the repair method for the support structure 110 according to the present embodiment is used. If it is, it can respond easily to the height fluctuation of the rail 100. In the present embodiment, the case where the support height L2 of the support structure 110 is reduced has been described, but it goes without saying that the repair method of the present embodiment can be applied even when the support height L2 is increased. Nor.

  Further, a reinforcing bar 133 and an anchor 134 are disposed inside the grout 140, that is, the grout 140 functions as a structure for supporting the rail 100. Furthermore, the grout 140 has a strength equal to or higher than that of concrete. Therefore, the grout 140 can support the rail 100 appropriately.

  Further, since organic fibers are mixed in the grout 140, thermal cracking of the grout 140 can be prevented. As a result, the lifetime of the grout 140 can be extended. In the present embodiment, organic fibers are used as a material mixed in the grout 140 to prevent thermal cracking, but the present invention is not limited to this. As long as the material does not sink or float in the grout 140, various fiber materials such as metal fibers can be used.

  Further, since the mixer 150 that generates the grout 140 is configured to be movable by the moving mechanism 152, the mixer 150 can be quickly moved to the placement location, and the grout 140 can be continuously placed. Therefore, the support structure 110 can be repaired efficiently in a shorter time.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. 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.

  For example, although the above embodiment demonstrated the case where a to-be-supported body was the rail 100, a to-be-supported body is not limited to this. When the support height of the supported body is changed regardless of the type of the supported body, the repair method for the support structure of the present invention can be applied.

  INDUSTRIAL APPLICABILITY The present invention is useful for repairing a support structure that supports a supported body when the height of the supported body is changed and the installation top end level of the supported body is not changed.

DESCRIPTION OF SYMBOLS 1 Coke oven 10 Coal tank 11 A furnace 12 B furnace 100 Rail 100a Old rail 100b New rail 101 Charging vehicle 110 Support structure 111 Stringer 112 Concrete foundation 112a Rolling area 113 Base plate 114 Leveling material 120 Formwork 130 Base plate 131 Support Member 132 Beard muscle 133 Reinforcing bar 134 Anchor 140 Grout 150 Mixer 151 Chute 152 Movement mechanism

Claims (5)

When the height dimension of the supported body is changed and the installation top level of the supported body is not changed, a method for repairing the support structure including the concrete foundation that supports the supported body,
A repair method for a supporting structure, characterized in that a grout is placed between the supported body and the existing concrete foundation in a state where reinforcing bars are disposed. The method for repairing a support structure according to claim 1, wherein the grout has a flow value that self-flows in a state where the reinforcing bars are disposed, and has a strength equal to or higher than that of concrete. The method for repairing a support structure according to claim 1, wherein a fiber material is mixed in the grout. The method for repairing a support structure according to any one of claims 1 to 3, wherein the grout has granulated slag. The supported body is a rail,
The mixer according to any one of claims 1 to 4, wherein a mixer for generating the grout is moved to a placement location, and the grout generated by the mixer is continuously placed. How to repair the structure.

Images