Method of installing precast block, and coke oven

Abstract

A problem to be solved by the present invention is to enable the precast blocks to be easily installed in the coke oven even though the rails present on an upper part of the coke oven. A method of installing precast blocks (PB) in a coke oven (1) provided with rails (R) on an upper part of the coke oven (1) includes: a preparation step of preparing a precast block (PB) such that a joint end face (SE) where a laterally adjacent precast block (PB) is joined is positioned in an under-rail region (BR); a lowering step of suspending and lowering the precast block (PB) from the upper part of the coke oven (1) without interfering with the rails (R); a moving step of moving the precast block (PB) in a longitudinal direction (FD) such that, for each of the precast blocks (PB) partially located in the under-rail region (BR), one of its joint end faces (SE) is located in the under-rail region (BR); and an installation step of installing the precast block (PB) in an intended installation position (SPB).

Description

Technical field

[0001] The present invention relates to a method of installing precast blocks, and a coke oven.Background art

[0002] In the present application, with respect to the horizontal directions, the direction in which coke is pushed out of the coke oven is defined as a longitudinal direction FD, and the horizontal direction orthogonal to the longitudinal direction FD is defined as a battery direction SD. The longitudinal direction FD and the battery direction SD are defined as the directions in which a precast block PB is installed in the coke oven. In the drawings, the longitudinal direction FD is indicated by a double-headed arrow labeled "FD", and the battery direction SD is indicated by a double-headed arrow labeled "SD".

[0003] Fig. 1 is a cross-sectional view showing a coke oven 1 as seen from a pusher side. As shown in Fig. 1, in the coke oven 1, a plurality of combustion chambers 13 are constructed by stacking a number of refractory bricks 12 on a corbel 16 provided above regenerative chambers 11, and a plurality of carbonization chambers 14 are also formed on the corbel 16. In Fig. 1, a flue (not shown) is formed in each of the combustion chambers 13, and a carbonization chamber 14 is formed between each pair of adjacent combustion chambers 13. Although omitted in the drawing, additional combustion chambers 13 and carbonization chambers 14 are also provided to the left and right in the battery direction SD in the coke oven 1 shown in Fig. 1.

[0004] The coke oven 1 is operated under extremely high-temperature conditions, and prolonged use causes aged deterioration. If a hole or defect forms in the combustion chamber 13 due to the aged deterioration, it can be repaired by forming a thermal spray coating on the surface of the combustion chamber 13, as described in Patent Literature 1. Also due to the aged deterioration, the refractory bricks 12 in the combustion chamber 13 may become displaced and project into the carbonization chamber 14. When such a protrusion occurs, it obstructs the discharge of the coke that has been carbonized in the carbonization chamber 14, making it difficult to push the coke out.

[0005] In addition, when the protrusion of the refractory bricks 12 occurs in the combustion chamber 13 due to the aged deterioration, it is necessary to remove the damaged refractory bricks 12 and repair the combustion chamber 13. In this case, the combustion chambers 13 deteriorated and displaced, among the plurality of combustion chambers 13, are dismantled, and new combustion chambers 13 are constructed, as disclosed in Patent Literatures 2 and 3. In Fig. 1, three combustion chambers 13, together with the corresponding portion of the oven ceiling 15 located above them within a transfer range TR indicated by oblique lines, will be dismantled and reconstructed.

[0006] The new combustion chambers 13 can be reconstructed by installing a number of precast blocks PB in size greater than that of the refractory bricks 12 (see Patent Literature 3). Fig. 2 is a perspective view showing the combustion chambers 13 constructed in the transfer range TR. The combustion chamber 13 is reconstructed with a plurality of precast blocks PB arranged along the longitudinal direction FD as indicated by the double-headed arrows. In an embodiment shown in Fig. 2, three combustion chambers 13 are constructed in the battery direction SD in the transfer range TR. Here, a carbonization chamber 14 is formed between each pair of adjacent combustion chambers 13. The combustion chambers 13 and the carbonization chambers 14 are alternately formed in the battery direction SD. The length of a precast block PB in the battery direction SD corresponds to the width of a combustion chamber 13, and the combustion chamber 13 is formed by stacking a plurality of precast blocks PB. Each of the precast blocks PB includes an internal flue space. Then, a flue is formed in the internal space of the combustion chamber 13 in which the precast blocks PB are stacked. The oven ceiling 15 is installed on the combustion chambers 13 and the carbonization chambers 14. The oven ceiling 15 shown in Fig. 2 is in a state before a castable refractory layer is cast and leveled on its upper surface.

[0007] Fig. 3 shows a state where a plurality of precast blocks PB are installed in the transfer range TR. Similar to Fig. 1, Fig. 3 is a cross-sectional view of the coke oven 1 which is perpendicular to the longitudinal direction FD, as seen from the pusher side. Fig. 3 shows a state where the combustion chambers 13 are being constructed with the precast blocks PB in the transfer range TR indicated by a dushed line. Here, a precast block PB1 refers to a precast block that is being suspended for installation, while a precast block PB2 refers to a precast block that has already been installed. As shown in Fig. 3, the precast block PB1 is suspended from the top of the coke oven 1 and installed in the transfer range TR in the same manner as the precast block PB2.

[0008] In order to reconstruct the combustion chambers 13 and the carbonization chambers 14, a traveling crane 2 is provided on the top of the coke oven 1 shown in Fig. 3 to carry the precast blocks PB and so forth. The traveling crane 2 is lifted up to the oven ceiling 15 by a crane vehicle and installed on rails R for a coal charging car (not shown). The rails R extend in the battery direction SD. The traveling crane 2 shown in Fig. 3 includes a crane frame 21, crane rails 22, a mobile rail 23, wheels 24, and a winch 25. Two crane rails 22 are mounted on the upper part of the crane frame 21 to extend in the longitudinal direction FD. In addition, the mobile rail 23 extending in the battery direction SD is provided across the two crane rails 22. The traveling crane 2 is placed on the rails R via the wheels 24. The mobile rail 23 extending in the battery direction SD can move along the crane rails 22 in the longitudinal direction FD. The winch 25 movably mounted on the mobile rail 23 is movable within the crane frame 21 in both the battery direction SD and the longitudinal direction FD. The winch 25 can wind the wire 3. The precast block PB1 is held by a gripping device 4 attached to the lower end of the wire 3. The precast block PB1 is held by the gripping device 4 at its side surfaces CS1. The side surfaces CS1 face the carbonization chambers 14 when the precast block PB1 is installed to constitute the combustion chamber 13. The wheels 24 are provided under the crane frame 21, and the traveling crane 2 can move on the rails R in the battery direction SD. The rails R are laid on the oven ceiling 15, and are suspended in midair in the transfer range TR.

[0009] In Fig. 3, the precast block PB2 is placed on the corbel 16 in the transfer range TR. The precast block PB1 is suspended from the traveling crane 2 above the installed precast block PB2. As described above, the rails R for a coal charging car (not shown) is provided on the upper part of the coke oven 1. The traveling crane 2 is provided on the rails R, and the precast block PB1 is suspended and lowered from above to construct the combustion chambers 13.Citation listPatent Literature

[0010] PTL1: Japanese Patent Application Laid-Open No. 2021-130783 PTL2: International Publication No.2012 / 078036 PTL3: Japanese Patent Application Laid-Open No. 2017-137447 Summary of InventionTechnical Problem

[0011] As shown in Fig. 3, even after the combustion chambers 13 in the transfer range TR are dismantled, the rails R remain installed across the upper opening of the transfer range TR. As a result, it may make it difficult to install the precast block PB1. Fig. 4 is a cross-sectional view showing the coke oven 1 illustrating an example in which the precast block cannot be installed. This cross-section of the coke oven 1 is perpendicular to the battery direction SD. In Fig. 4, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Fig. 4 is a cross-sectional view taken along the direction of arrow F in Fig. 3. Fig. 3 is a cross-sectional view taken along the direction of arrow S in Fig. 4. The location indicated by the arrow F corresponds to the transfer range TR where no combustion chamber 13 is present between the top of the corbel 16 and the rails R. As seen from the arrow F, two rails R remain above the transfer range TR as shown in Fig. 4. Fig. 4 shows a state in which the combustion chamber 13 is being constructed with the precast blocks PB in the transfer range TR.

[0012] In Fig. 4, the winch 25 is being moved in the direction of arrow M to install the precast block PB1 held by the gripping device 4 at an intended installation position SPB indicated by a dashed line on the right of the precast blocks PB2 already installed. The precast block PB1 is being lowered from the upper part of the coke oven 1 without interfering with the rail R. However, the rail R interferes with the movement of the wire 3 in the direction of arrow M, preventing the precast block PB1 from reaching the intended installation position SPB. Thus, it is difficult to install the precast block PB1 at the intended installation position SPB under the rail R. In this way, if the design of the combustion chamber 13 has the intended installation position SPB as shown in Fig. 4, it becomes difficult to construct the combustion chamber 13 on the site because the rail R obstructs the placement of the precast block PB. This difficulty also arises during construction of a new coke oven 1, when the design of the combustion chamber 13 has the intended installation position SPB as shown in Fig. 4 and the rails R are installed on the upper part of the coke oven 1.

[0013] A problem to be solved by the present invention is to enable the precast blocks to be easily installed in the coke oven even though the rails present on an upper part of the coke oven.Solution to Problem

[0014] According to an aspect of the present invention, a method of installing precast blocks in a coke oven provided with rails on an upper part of the coke oven includes: a preparation step of preparing a precast block such that a joint end face where a laterally adjacent precast block is joined is positioned in an under-rail region; a lowering step of suspending and lowering the precast block from the upper part of the coke oven without interfering with the rails; a moving step of moving the precast block in a longitudinal direction such that, for each of the precast blocks partially located in the under-rail region, one of its joint end faces is located in the under-rail region; and an installation step of installing the precast block in an intended installation position.

[0015] In addition, according to an aspect of the present invention, a coke oven includes: rails provided on an upper part of the coke oven; a corbel; and combustion chambers formed by installing a plurality of precast blocks on the corbel. For each of the precast blocks partially located in an under-rail region, one of its joint end faces (SE) is located in the under-rail region.Advantageous Effect of Invention

[0016] According to the present invention, it is possible to easily install the precast blocks in the coke oven even though the rails present on the upper part of the coke oven.Brief Description of Drawings

[0017] Fig. 1 is a cross-sectional view showing a coke oven as seen from a pusher side; Fig. 2 is a perspective view showing combustion chambers constructed with precast blocks; Fig. 3 is a cross-sectional view showing the coke oven in which a precast block is being suspended in a transfer range; Fig. 4 is a cross-sectional view showing the coke oven in which a precast block cannot be installed; Fig. 5 is a cross-sectional view showing the coke oven in which the precast block is being moved according to an embodiment of the present invention; Fig. 6 is a cross-sectional view showing the coke oven in which the precast block is being installed according to the embodiment of the present invention; Fig. 7 shows an example of a precast block layout that prevents successful installation of precast blocks; and Fig. 8 shows the combustion chamber with the precast blocks according to the embodiment. Description of Embodiments

[0018] With reference to Figs. 5 and 6, a method of installing the precast block PB1 in the coke oven 1 provided with the rails R on the upper part of the coke oven 1 will be described. Similar to Fig. 4, each of Figs. 5 and 6 is a cross-sectional view showing the coke oven 1, which is perpendicular to the battery direction SD. In Figs. 5 and 6, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Also similar to Fig. 4, the precast block PB1 refers to a precast block that is being suspended for installation, while the precast block PB2 refers to a precast block that has already been installed.

[0019] As shown in Figs. 5 and 6, the rail R on which the wheel 24 of the traveling crane 2 is placed includes a rail body RM contacting the wheel 24, and a rail base RB connected to the bottom of the rail body RM to support the rail body RM. The rails R extending in the battery direction SD are provided on the upper part of the coke oven 1 for a coal charging car (not shown), and define the width direction as the longitudinal direction FD. The rail R has the same width in the longitudinal direction FD as the rail base RB. In the area where the oven ceiling 15 is present, the rail base RB is embedded in the oven ceiling 15, and the rail body RM protrudes upward from the top surface of the oven ceiling 15.

[0020] Fig. 5 shows a state where the precast block PB1 is being moved according to the embodiment of the present invention. Similarly to Fig. 4, a cross-sectional view taken along the direction of arrow S in Fig. 5 corresponds to the cross-sectional view of Fig. 3. Fig. 5 is a cross-sectional view taken along the arrow F in Fig. 3. In this cross section, since the area below the rails R corresponds to the transfer range TR, neither the oven ceiling 15 nor the combustion chamber 13 is present, and the rail R remains in a suspended state. In Fig. 5, the precast block PB2 is installed on the corbel 16. In addition, the precast block PB1 is suspended from the traveling crane 2. Fig. 5 shows a lowering step in which the precast block PB1 is suspended and lowered in the direction of arrow D from the upper part of the coke oven 1 without interfering with the rails R, and a moving step in which the precast block PB1 is moved in the direction of arrow M corresponding to the longitudinal direction FD. In the lowering step according to the embodiment, the precast block PB1 is suspended and lowered from the inside of the crane frame 21 to the transfer range TR without interfering with the rail R.

[0021] The crane rail 22 extending in the longitudinal direction FD is mounted to the upper part of the crane frame 21, and the mobile rail 23 extending in the battery direction SD is mounted to the crane rail 22. The mobile rail 23 extending in the battery direction SD can move along the crane rail 22 in the longitudinal direction FD. The winch 25 movably attached to the mobile rail 23 can move in both the battery direction SD and the longitudinal direction FD. The winch 25 can wind the wire 3, and the precast block PB1 is held by a gripping device 4 attached to the lower end of the wire 3.

[0022] The precast block PB, such as the precast block PB1 and the precast block PB2 used to construct the combustion chambers 13, has a size and a shape designed depending on the installation location in the coke oven 1, and is manufactured. In Fig. 5, the precast block PB1 has the same height as that of the precast block PB2, but a different length in the longitudinal direction FD. However, some or almost all of the precast blocks PB constituting the combustion chamber 13 may have the same length in the longitudinal direction FD.

[0023] As shown in Fig. 5, the precast block PB2 that has already been installed is positioned with respect to the center of the coke oven 1 in the longitudinal direction FD. Then, starting from the precast block PB2, the precast blocks PB1 are sequentially installed to both sides in the horizontal direction in Fig. 5. By installing the precast blocks PB sequentially from the precast block PB positioned with respect to the center in the longitudinal direction FD, it is possible to install the precast blocks PB at accurate positions. In Fig. 5, the first row of precast blocks PB from the bottom has been installed. Then, the second and subsequent rows are also installed sequentially from the precast block PB positioned with respect to the center in the longitudinal direction FD in the same manner.

[0024] As shown in Fig. 5, there is no rail R above the precast block PB2 that has already been placed on the corbel 16. Therefore, the precast block PB2 can be lowered almost vertically from the crane frame 21 of the traveling crane 2. However, when installing the precast block PB1 under the rail R, it is not possible to place the precast block PB1 in a predetermined position by simply lowering the precast block PB1 vertically from the traveling crane 2. Therefore, the precast block PB1 is suspended and lowered from above the coke oven 1 to the transfer range TR without interfering with the rail R as shown in Fig. 5 in the lowering step, and then the winch 25 is moved in the direction of arrow M in the moving step. By this means, the position of the precast block PB1 is adjusted so that part of the precast block PB1 fits under the rail R, allowing the precast block PB1 to be moved over the intended installation position SPB. The precast block PB1, once moved to the intended installation position SPB, is joined at its joint end face SE1 to a joint end face SE2 of the precast block PB2.

[0025] Fig. 6 is a cross-sectional view showing the coke oven 1 in which the precast block PB1 is being installed according to the embodiment of the present invention. Fig. 6 shows a state where the precast block PB1 which has been suspended and lowered on the corbel 16 is being installed in an installation step. A portion of the precast block PB1 is located in an under-rail region BR. After the state shown in Fig. 6, another precast block PB, part of which is located in the under-rail region BR, is installed adjacent to the precast block PB1. The joint end face SE1 shown in Fig. 6 is a portion of the precast block PB joining an adjacent precast block PB and is located in the under-rail region BR. Fig. 6 shows the final state of the installation step in which the precast block PB1 is moved and positioned such that its joint end face SE1 is located in the under-rail region BR, that is, a portion of the precast block PB1 is located in the under-rail region BR.

[0026] After being moved from the position in Fig. 5 to a position above the intended installation position SPB in the direction of arrow M in the moving step, the precast block PB1 is lowered in the direction of arrow D by paying out the wire 3 from the winch 25 in the installation step shown in Fig. 6. By this means, the precast block PB1 can be installed under the rail R as shown in Fig. 6. In the lowering step, the moving step, and the installation step as illustrated in Figs. 5 and 6, the wire 3 does not come into contact with the rail R, and the rail R does not interfere with the installation. The precast block PB1 shown in Fig. 6, which has been suspended using the wire 3 and installed, is partially located in the under-rail region BR, in particular, its joint end face SE1 is located in the under-rail region BR. By installing the precast blocks PB1 as illustrated in Figs. 5 and 6, each of the precast blocks PB1, which is partially located in the under-rail region BR, can be positioned such that one of its joint end faces SE1 is located in the under-rail region BR.

[0027] The precast blocks PB have different thicknesses in the battery direction SD, depending on their respective installation positions within the combustion chamber 13. The combustion chamber 13 is formed such that its thickness in the battery direction SD decreases from the pusher side toward the coke side, while the carbonization chamber 14 is formed such that its width increases toward the coke side. The precast blocks PB are designed with shapes corresponding to their installation positions and are manufactured accordingly. Then, the precast blocks PB are prepared by being transported to the site of the coke oven 1 during a preparation step, and are assembled within the coke oven 1 through the suspension and related steps to form the combustion chamber 13. The combustion chamber 13 is designed to be constructed by installing the precast blocks PB of different shapes at predetermined positions. In this way, to construct the combustion chamber 13, the shape of each precast block PB is designed according to its installation position. The precast blocks PB are then manufactured in accordance with the designed shapes and installed at the corresponding predetermined positions.

[0028] In the embodiment, each of the precast blocks PB installed in the under-rail region BR is positioned such that one of its joint end faces SE1 is located in the under-rail region BR. Moreover, the precast blocks PB and the combustion chamber 13 constructed from them are designed such that the joint end faces SE, at which laterally adjacent precast blocks PB are joined, are located in the under-rail region BR. The precast blocks PB designed as described above are manufactured and transported to the site of the coke oven 1 during the preparation step. Then, the precast blocks PB are inserted into the under-rail region BR from opposite sides in the width direction of the rail R, which is provided on the upper part of the coke oven 1, during their respective moving steps. The precast blocks PB are installed by being shallowly inserted from both sides in the width direction of the rail R, respectively, so that the rail R is less likely to obstruct the wire 3 suspending the precast blocks PB. By positioning and installing each precast block PB, a portion of which is to be located in the under-rail region BR such that its joint end face SE is located in the under-rail region BR, it becomes possible to prevent the rail R from interfering with the wire 3.

[0029] Fig. 7 shows an example of a precast block layout that prevents successful installation of precast blocks PB. In the shown example, the hatched precast block PB is located in the under-rail region BR, but neither of its joint end faces SE is within the under-rail region BR. If the precast block PB used to construct the combustion chamber 13 is designed in this way, and manufactured and then prepared in the site of the coke oven 1, it may become impossible to move the precast block PB to the intended installation position SPB, because the rail R may interfere with the wire 3 as illustrated in Fig. 4. The precast block PB shown with hatching is not manufactured such that its joint end face SE is located in the under-rail region BR where it would join a laterally adjacent precast block PB.

[0030] Fig. 8 shows the combustion chamber 13 with the precast blocks PB according to the present embodiment. As shown in Fig. 8, for each of the precast blocks PB partially located in the under-rail region BR, one of its joint end faces SE is located in the under-rail region BR. The combustion chamber 13 as shown in Fig. 8 can be constructed by installing the precast blocks PB by the lowering step and so forth shown in Figs. 5 and 6. The configuration of the combustion chamber 13 as shown in Fig. 8 allows the coke oven 1 to be constructed with the multiple precast blocks PB installed on the corbel 16 and the rails R provided on the upper part of the coke oven 1.

[0031] When the precast block PB is designed so that its joint end face SE is located in the under-rail region BR, if it is small (short in the longitudinal direction FD), the wire 3 may come into contact with the rail R during the lowering step and the installation step. However, because the small precast block PB is lightweight, even if the wire 3 comes into contact with the rail R, it can be relatively easily shifted by human effort to a position directly above the intended installation position SPB. Even when installing the small precast block PB, it is positioned such that its joint end face SE is located in the under-rail region BR.

[0032] As described above, the precast blocks PB are designed with shapes corresponding to their installation positions and are manufactured accordingly, and then installed inside the coke oven 1 to form the combustion chamber 13. The combustion chamber 13 is designed to be constructed by installing the precast blocks PB of various shapes at predetermined positions.

[0033] When suspending and lowering the precast block PB by the wire 3, it is necessary to prevent the precast block PB from tilting. To keep the precast block PB level, the gripping device 4 should grip it near its center of gravity. As shown in Fig. 4, if the combustion chamber 13 is designed such that the center of gravity of the precast block PB, at its intended installation position SPB, falls within the under-rail region BR, it becomes difficult to install that precast block PB in the coke oven 1. In contrast, if the centers of gravity of all the precast blocks PB are positioned away from the under-rail region BR, the combustion chamber 13 can be constructed.

[0034] If the length of the precast block PB in the longitudinal direction FD is greater than twice the width of the rail R, the center of gravity does not lie within the under-rail region BR, as long as one of the joint end faces SE is located in the under-rail region BR. In the preparation step, the precast blocks PB with appropriate lengths in the longitudinal direction FD are prepared so that the joint end face SE, where laterally adjacent precast blocks PB are joined, can be located in the under-rail region BR. In the embodiment, the precast blocks PB of appropriate lengths are designed in such a way that the joint end faces SE located one above the other do not align at the same position in the longitudinal direction FD. These precast blocks PB are then prepared so that the combustion chamber 13 can be constructed using them. Even in the case of the small precast block PB having a length in the longitudinal direction FD that is smaller than twice the width of the rail R, when the center of gravity of the precast block PB is designed not to lie within the under-rail region BR, the precast block PB can be installed such that part of it is positioned in the under-rail region BR, without the wire 3 coming into contact with the rail R.

[0035] Moreover, regardless of the sizes of the precast blocks PB, if the center of gravity of each of the precast blocks PB, which is partially located in the under-rail region BR, is positioned outside the under-rail region BR, the rail R does not obstruct the wire 3 during installation of the precast block PB. Therefore, by designing the center of gravity of each of the precast blocks PB, which is partially located in the under-rail region BR, is positioned outside the under-rail region BR, and positioning and installing them accordingly, the rail R does not interfere with the wire. When designing the combustion chamber 13 and the precast blocks PB, it is preferable to arrange each of precast blocks PB whose one joint end face SE is located in the under-rail region BR such that its center in the longitudinal direction FD is slightly offset from the under-rail region BR.

[0036] By installing the precast block PB whose length is greater than twice the width of the rail R in the under-rail region BR, the rail R is less likely to obstruct the wire 3. As described above, if the precast block PB is small, it is lightweight and therefore is relatively easily moved to a position above the intended installation position SPB, even if the wire 3 comes into contact with the rail R during installation. Furthermore, regardless of the sizes of the precast blocks PB, the precast blocks PB are installed by being shallowly inserted from both sides in the width direction of the rail R, respectively, so that the rail R is less likely to obstruct the wire 3 suspending the precast blocks PB.

[0037] By moving each of the precast blocks PB1 which is partially located in the under-rail region BR in the longitudinal direction FD so that its joint end face SE is positioned in the under-rail region BR, the precast block PB is installed in the intended installation position SPB. As a result, it is possible to arrange the precast blocks PB substantially in the under-rail region BR with no gaps. Moreover, if each of the precast blocks PB is positioned and installed so that its center of gravity does not lie within the under-rail region BR, installation can be carried out easily even in the case where short precast blocks PB are used.

[0038] In the embodiment, the precast blocks PB are used to form the combustion chamber 13, and the same applies to the precast blocks for forming the oven ceiling 15. Moreover, in the embodiment, the precast block PB is suspended by the traveling crane 2 movably provided on the rails R, although other types of cranes may be used as long as the precast block PB is suspended from above the rails R.

[0039] For the rest, the specific configurations are not limited to the embodiment, and the design can be changed without departing from the scope of the present invention.List of reference signs

[0040] 1 coke oven 11 regenerative chamber 12refractory brick 13 combustion chamber 14 carbonization chamber 15 oven ceiling 16 corbel 2 traveling crane 21 crane frame 22 crane rail 23 mobile rail 24 wheel 25 winch 3 wire 4 gripping device PB precast block PB1 precast block PB2 precast block CS1 side surface SE joint end face SE1 joint end face SE2 joint end face SPB intended installation position TR transfer range R rail RM rail body PB rail base BR under-rail region FD longitudinal direction SD battery direction

Examples

Embodiment Construction

[0018]With reference to Figs. 5 and 6, a method of installing the precast block PB1 in the coke oven 1 provided with the rails R on the upper part of the coke oven 1 will be described. Similar to Fig. 4, each of Figs. 5 and 6 is a cross-sectional view showing the coke oven 1, which is perpendicular to the battery direction SD. In Figs. 5 and 6, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Also similar to Fig. 4, the precast block PB1 refers to a precast block that is being suspended for installation, while the precast block PB2 refers to a precast block that has already been installed.

[0019]As shown in Figs. 5 and 6, the rail R on which the wheel 24 of the traveling crane 2 is placed includes a rail body RM contacting the wheel 24, and a rail base RB connected to the bottom of the rail body RM to support the rail body RM. The rails R extending in the battery direction SD are provided on the up...

Technical field

[0001] The present invention relates to a method of installing precast blocks, and a coke oven.Background art

[0002] In the present application, with respect to the horizontal directions, the direction in which coke is pushed out of the coke oven is defined as a longitudinal direction FD, and the horizontal direction orthogonal to the longitudinal direction FD is defined as a battery direction SD. The longitudinal direction FD and the battery direction SD are defined as the directions in which a precast block PB is installed in the coke oven. In the drawings, the longitudinal direction FD is indicated by a double-headed arrow labeled "FD", and the battery direction SD is indicated by a double-headed arrow labeled "SD".

[0003] Fig. 1 is a cross-sectional view showing a coke oven 1 as seen from a pusher side. As shown in Fig. 1, in the coke oven 1, a plurality of combustion chambers 13 are constructed by stacking a number of refractory bricks 12 on a corbel 16 provided above regenerative chambers 11, and a plurality of carbonization chambers 14 are also formed on the corbel 16. In Fig. 1, a flue (not shown) is formed in each of the combustion chambers 13, and a carbonization chamber 14 is formed between each pair of adjacent combustion chambers 13. Although omitted in the drawing, additional combustion chambers 13 and carbonization chambers 14 are also provided to the left and right in the battery direction SD in the coke oven 1 shown in Fig. 1.

[0004] The coke oven 1 is operated under extremely high-temperature conditions, and prolonged use causes aged deterioration. If a hole or defect forms in the combustion chamber 13 due to the aged deterioration, it can be repaired by forming a thermal spray coating on the surface of the combustion chamber 13, as described in Patent Literature 1. Also due to the aged deterioration, the refractory bricks 12 in the combustion chamber 13 may become displaced and project into the carbonization chamber 14. When such a protrusion occurs, it obstructs the discharge of the coke that has been carbonized in the carbonization chamber 14, making it difficult to push the coke out.

[0005] In addition, when the protrusion of the refractory bricks 12 occurs in the combustion chamber 13 due to the aged deterioration, it is necessary to remove the damaged refractory bricks 12 and repair the combustion chamber 13. In this case, the combustion chambers 13 deteriorated and displaced, among the plurality of combustion chambers 13, are dismantled, and new combustion chambers 13 are constructed, as disclosed in Patent Literatures 2 and 3. In Fig. 1, three combustion chambers 13, together with the corresponding portion of the oven ceiling 15 located above them within a transfer range TR indicated by oblique lines, will be dismantled and reconstructed.

[0006] The new combustion chambers 13 can be reconstructed by installing a number of precast blocks PB in size greater than that of the refractory bricks 12 (see Patent Literature 3). Fig. 2 is a perspective view showing the combustion chambers 13 constructed in the transfer range TR. The combustion chamber 13 is reconstructed with a plurality of precast blocks PB arranged along the longitudinal direction FD as indicated by the double-headed arrows. In an embodiment shown in Fig. 2, three combustion chambers 13 are constructed in the battery direction SD in the transfer range TR. Here, a carbonization chamber 14 is formed between each pair of adjacent combustion chambers 13. The combustion chambers 13 and the carbonization chambers 14 are alternately formed in the battery direction SD. The length of a precast block PB in the battery direction SD corresponds to the width of a combustion chamber 13, and the combustion chamber 13 is formed by stacking a plurality of precast blocks PB. Each of the precast blocks PB includes an internal flue space. Then, a flue is formed in the internal space of the combustion chamber 13 in which the precast blocks PB are stacked. The oven ceiling 15 is installed on the combustion chambers 13 and the carbonization chambers 14. The oven ceiling 15 shown in Fig. 2 is in a state before a castable refractory layer is cast and leveled on its upper surface.

[0007] Fig. 3 shows a state where a plurality of precast blocks PB are installed in the transfer range TR. Similar to Fig. 1, Fig. 3 is a cross-sectional view of the coke oven 1 which is perpendicular to the longitudinal direction FD, as seen from the pusher side. Fig. 3 shows a state where the combustion chambers 13 are being constructed with the precast blocks PB in the transfer range TR indicated by a dushed line. Here, a precast block PB1 refers to a precast block that is being suspended for installation, while a precast block PB2 refers to a precast block that has already been installed. As shown in Fig. 3, the precast block PB1 is suspended from the top of the coke oven 1 and installed in the transfer range TR in the same manner as the precast block PB2.

[0008] In order to reconstruct the combustion chambers 13 and the carbonization chambers 14, a traveling crane 2 is provided on the top of the coke oven 1 shown in Fig. 3 to carry the precast blocks PB and so forth. The traveling crane 2 is lifted up to the oven ceiling 15 by a crane vehicle and installed on rails R for a coal charging car (not shown). The rails R extend in the battery direction SD. The traveling crane 2 shown in Fig. 3 includes a crane frame 21, crane rails 22, a mobile rail 23, wheels 24, and a winch 25. Two crane rails 22 are mounted on the upper part of the crane frame 21 to extend in the longitudinal direction FD. In addition, the mobile rail 23 extending in the battery direction SD is provided across the two crane rails 22. The traveling crane 2 is placed on the rails R via the wheels 24. The mobile rail 23 extending in the battery direction SD can move along the crane rails 22 in the longitudinal direction FD. The winch 25 movably mounted on the mobile rail 23 is movable within the crane frame 21 in both the battery direction SD and the longitudinal direction FD. The winch 25 can wind the wire 3. The precast block PB1 is held by a gripping device 4 attached to the lower end of the wire 3. The precast block PB1 is held by the gripping device 4 at its side surfaces CS1. The side surfaces CS1 face the carbonization chambers 14 when the precast block PB1 is installed to constitute the combustion chamber 13. The wheels 24 are provided under the crane frame 21, and the traveling crane 2 can move on the rails R in the battery direction SD. The rails R are laid on the oven ceiling 15, and are suspended in midair in the transfer range TR.

[0009] In Fig. 3, the precast block PB2 is placed on the corbel 16 in the transfer range TR. The precast block PB1 is suspended from the traveling crane 2 above the installed precast block PB2. As described above, the rails R for a coal charging car (not shown) is provided on the upper part of the coke oven 1. The traveling crane 2 is provided on the rails R, and the precast block PB1 is suspended and lowered from above to construct the combustion chambers 13.Citation listPatent Literature

[0010] PTL1: Japanese Patent Application Laid-Open No. 2021-130783 PTL2: International Publication No.2012 / 078036 PTL3: Japanese Patent Application Laid-Open No. 2017-137447 Summary of InventionTechnical Problem

[0011] As shown in Fig. 3, even after the combustion chambers 13 in the transfer range TR are dismantled, the rails R remain installed across the upper opening of the transfer range TR. As a result, it may make it difficult to install the precast block PB1. Fig. 4 is a cross-sectional view showing the coke oven 1 illustrating an example in which the precast block cannot be installed. This cross-section of the coke oven 1 is perpendicular to the battery direction SD. In Fig. 4, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Fig. 4 is a cross-sectional view taken along the direction of arrow F in Fig. 3. Fig. 3 is a cross-sectional view taken along the direction of arrow S in Fig. 4. The location indicated by the arrow F corresponds to the transfer range TR where no combustion chamber 13 is present between the top of the corbel 16 and the rails R. As seen from the arrow F, two rails R remain above the transfer range TR as shown in Fig. 4. Fig. 4 shows a state in which the combustion chamber 13 is being constructed with the precast blocks PB in the transfer range TR.

[0012] In Fig. 4, the winch 25 is being moved in the direction of arrow M to install the precast block PB1 held by the gripping device 4 at an intended installation position SPB indicated by a dashed line on the right of the precast blocks PB2 already installed. The precast block PB1 is being lowered from the upper part of the coke oven 1 without interfering with the rail R. However, the rail R interferes with the movement of the wire 3 in the direction of arrow M, preventing the precast block PB1 from reaching the intended installation position SPB. Thus, it is difficult to install the precast block PB1 at the intended installation position SPB under the rail R. In this way, if the design of the combustion chamber 13 has the intended installation position SPB as shown in Fig. 4, it becomes difficult to construct the combustion chamber 13 on the site because the rail R obstructs the placement of the precast block PB. This difficulty also arises during construction of a new coke oven 1, when the design of the combustion chamber 13 has the intended installation position SPB as shown in Fig. 4 and the rails R are installed on the upper part of the coke oven 1.

[0013] A problem to be solved by the present invention is to enable the precast blocks to be easily installed in the coke oven even though the rails present on an upper part of the coke oven.Solution to Problem

[0014] According to an aspect of the present invention, a method of installing precast blocks in a coke oven provided with rails on an upper part of the coke oven includes: a preparation step of preparing a precast block such that a joint end face where a laterally adjacent precast block is joined is positioned in an under-rail region; a lowering step of suspending and lowering the precast block from the upper part of the coke oven without interfering with the rails; a moving step of moving the precast block in a longitudinal direction such that, for each of the precast blocks partially located in the under-rail region, one of its joint end faces is located in the under-rail region; and an installation step of installing the precast block in an intended installation position.

[0015] In addition, according to an aspect of the present invention, a coke oven includes: rails provided on an upper part of the coke oven; a corbel; and combustion chambers formed by installing a plurality of precast blocks on the corbel. For each of the precast blocks partially located in an under-rail region, one of its joint end faces (SE) is located in the under-rail region.Advantageous Effect of Invention

[0016] According to the present invention, it is possible to easily install the precast blocks in the coke oven even though the rails present on the upper part of the coke oven.Brief Description of Drawings

[0017] Fig. 1 is a cross-sectional view showing a coke oven as seen from a pusher side; Fig. 2 is a perspective view showing combustion chambers constructed with precast blocks; Fig. 3 is a cross-sectional view showing the coke oven in which a precast block is being suspended in a transfer range; Fig. 4 is a cross-sectional view showing the coke oven in which a precast block cannot be installed; Fig. 5 is a cross-sectional view showing the coke oven in which the precast block is being moved according to an embodiment of the present invention; Fig. 6 is a cross-sectional view showing the coke oven in which the precast block is being installed according to the embodiment of the present invention; Fig. 7 shows an example of a precast block layout that prevents successful installation of precast blocks; and Fig. 8 shows the combustion chamber with the precast blocks according to the embodiment. Description of Embodiments

[0018] With reference to Figs. 5 and 6, a method of installing the precast block PB1 in the coke oven 1 provided with the rails R on the upper part of the coke oven 1 will be described. Similar to Fig. 4, each of Figs. 5 and 6 is a cross-sectional view showing the coke oven 1, which is perpendicular to the battery direction SD. In Figs. 5 and 6, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Also similar to Fig. 4, the precast block PB1 refers to a precast block that is being suspended for installation, while the precast block PB2 refers to a precast block that has already been installed.

[0019] As shown in Figs. 5 and 6, the rail R on which the wheel 24 of the traveling crane 2 is placed includes a rail body RM contacting the wheel 24, and a rail base RB connected to the bottom of the rail body RM to support the rail body RM. The rails R extending in the battery direction SD are provided on the upper part of the coke oven 1 for a coal charging car (not shown), and define the width direction as the longitudinal direction FD. The rail R has the same width in the longitudinal direction FD as the rail base RB. In the area where the oven ceiling 15 is present, the rail base RB is embedded in the oven ceiling 15, and the rail body RM protrudes upward from the top surface of the oven ceiling 15.

[0020] Fig. 5 shows a state where the precast block PB1 is being moved according to the embodiment of the present invention. Similarly to Fig. 4, a cross-sectional view taken along the direction of arrow S in Fig. 5 corresponds to the cross-sectional view of Fig. 3. Fig. 5 is a cross-sectional view taken along the arrow F in Fig. 3. In this cross section, since the area below the rails R corresponds to the transfer range TR, neither the oven ceiling 15 nor the combustion chamber 13 is present, and the rail R remains in a suspended state. In Fig. 5, the precast block PB2 is installed on the corbel 16. In addition, the precast block PB1 is suspended from the traveling crane 2. Fig. 5 shows a lowering step in which the precast block PB1 is suspended and lowered in the direction of arrow D from the upper part of the coke oven 1 without interfering with the rails R, and a moving step in which the precast block PB1 is moved in the direction of arrow M corresponding to the longitudinal direction FD. In the lowering step according to the embodiment, the precast block PB1 is suspended and lowered from the inside of the crane frame 21 to the transfer range TR without interfering with the rail R.

[0021] The crane rail 22 extending in the longitudinal direction FD is mounted to the upper part of the crane frame 21, and the mobile rail 23 extending in the battery direction SD is mounted to the crane rail 22. The mobile rail 23 extending in the battery direction SD can move along the crane rail 22 in the longitudinal direction FD. The winch 25 movably attached to the mobile rail 23 can move in both the battery direction SD and the longitudinal direction FD. The winch 25 can wind the wire 3, and the precast block PB1 is held by a gripping device 4 attached to the lower end of the wire 3.

[0022] The precast block PB, such as the precast block PB1 and the precast block PB2 used to construct the combustion chambers 13, has a size and a shape designed depending on the installation location in the coke oven 1, and is manufactured. In Fig. 5, the precast block PB1 has the same height as that of the precast block PB2, but a different length in the longitudinal direction FD. However, some or almost all of the precast blocks PB constituting the combustion chamber 13 may have the same length in the longitudinal direction FD.

[0023] As shown in Fig. 5, the precast block PB2 that has already been installed is positioned with respect to the center of the coke oven 1 in the longitudinal direction FD. Then, starting from the precast block PB2, the precast blocks PB1 are sequentially installed to both sides in the horizontal direction in Fig. 5. By installing the precast blocks PB sequentially from the precast block PB positioned with respect to the center in the longitudinal direction FD, it is possible to install the precast blocks PB at accurate positions. In Fig. 5, the first row of precast blocks PB from the bottom has been installed. Then, the second and subsequent rows are also installed sequentially from the precast block PB positioned with respect to the center in the longitudinal direction FD in the same manner.

[0024] As shown in Fig. 5, there is no rail R above the precast block PB2 that has already been placed on the corbel 16. Therefore, the precast block PB2 can be lowered almost vertically from the crane frame 21 of the traveling crane 2. However, when installing the precast block PB1 under the rail R, it is not possible to place the precast block PB1 in a predetermined position by simply lowering the precast block PB1 vertically from the traveling crane 2. Therefore, the precast block PB1 is suspended and lowered from above the coke oven 1 to the transfer range TR without interfering with the rail R as shown in Fig. 5 in the lowering step, and then the winch 25 is moved in the direction of arrow M in the moving step. By this means, the position of the precast block PB1 is adjusted so that part of the precast block PB1 fits under the rail R, allowing the precast block PB1 to be moved over the intended installation position SPB. The precast block PB1, once moved to the intended installation position SPB, is joined at its joint end face SE1 to a joint end face SE2 of the precast block PB2.

[0025] Fig. 6 is a cross-sectional view showing the coke oven 1 in which the precast block PB1 is being installed according to the embodiment of the present invention. Fig. 6 shows a state where the precast block PB1 which has been suspended and lowered on the corbel 16 is being installed in an installation step. A portion of the precast block PB1 is located in an under-rail region BR. After the state shown in Fig. 6, another precast block PB, part of which is located in the under-rail region BR, is installed adjacent to the precast block PB1. The joint end face SE1 shown in Fig. 6 is a portion of the precast block PB joining an adjacent precast block PB and is located in the under-rail region BR. Fig. 6 shows the final state of the installation step in which the precast block PB1 is moved and positioned such that its joint end face SE1 is located in the under-rail region BR, that is, a portion of the precast block PB1 is located in the under-rail region BR.

[0026] After being moved from the position in Fig. 5 to a position above the intended installation position SPB in the direction of arrow M in the moving step, the precast block PB1 is lowered in the direction of arrow D by paying out the wire 3 from the winch 25 in the installation step shown in Fig. 6. By this means, the precast block PB1 can be installed under the rail R as shown in Fig. 6. In the lowering step, the moving step, and the installation step as illustrated in Figs. 5 and 6, the wire 3 does not come into contact with the rail R, and the rail R does not interfere with the installation. The precast block PB1 shown in Fig. 6, which has been suspended using the wire 3 and installed, is partially located in the under-rail region BR, in particular, its joint end face SE1 is located in the under-rail region BR. By installing the precast blocks PB1 as illustrated in Figs. 5 and 6, each of the precast blocks PB1, which is partially located in the under-rail region BR, can be positioned such that one of its joint end faces SE1 is located in the under-rail region BR.

[0027] The precast blocks PB have different thicknesses in the battery direction SD, depending on their respective installation positions within the combustion chamber 13. The combustion chamber 13 is formed such that its thickness in the battery direction SD decreases from the pusher side toward the coke side, while the carbonization chamber 14 is formed such that its width increases toward the coke side. The precast blocks PB are designed with shapes corresponding to their installation positions and are manufactured accordingly. Then, the precast blocks PB are prepared by being transported to the site of the coke oven 1 during a preparation step, and are assembled within the coke oven 1 through the suspension and related steps to form the combustion chamber 13. The combustion chamber 13 is designed to be constructed by installing the precast blocks PB of different shapes at predetermined positions. In this way, to construct the combustion chamber 13, the shape of each precast block PB is designed according to its installation position. The precast blocks PB are then manufactured in accordance with the designed shapes and installed at the corresponding predetermined positions.

[0028] In the embodiment, each of the precast blocks PB installed in the under-rail region BR is positioned such that one of its joint end faces SE1 is located in the under-rail region BR. Moreover, the precast blocks PB and the combustion chamber 13 constructed from them are designed such that the joint end faces SE, at which laterally adjacent precast blocks PB are joined, are located in the under-rail region BR. The precast blocks PB designed as described above are manufactured and transported to the site of the coke oven 1 during the preparation step. Then, the precast blocks PB are inserted into the under-rail region BR from opposite sides in the width direction of the rail R, which is provided on the upper part of the coke oven 1, during their respective moving steps. The precast blocks PB are installed by being shallowly inserted from both sides in the width direction of the rail R, respectively, so that the rail R is less likely to obstruct the wire 3 suspending the precast blocks PB. By positioning and installing each precast block PB, a portion of which is to be located in the under-rail region BR such that its joint end face SE is located in the under-rail region BR, it becomes possible to prevent the rail R from interfering with the wire 3.

[0029] Fig. 7 shows an example of a precast block layout that prevents successful installation of precast blocks PB. In the shown example, the hatched precast block PB is located in the under-rail region BR, but neither of its joint end faces SE is within the under-rail region BR. If the precast block PB used to construct the combustion chamber 13 is designed in this way, and manufactured and then prepared in the site of the coke oven 1, it may become impossible to move the precast block PB to the intended installation position SPB, because the rail R may interfere with the wire 3 as illustrated in Fig. 4. The precast block PB shown with hatching is not manufactured such that its joint end face SE is located in the under-rail region BR where it would join a laterally adjacent precast block PB.

[0030] Fig. 8 shows the combustion chamber 13 with the precast blocks PB according to the present embodiment. As shown in Fig. 8, for each of the precast blocks PB partially located in the under-rail region BR, one of its joint end faces SE is located in the under-rail region BR. The combustion chamber 13 as shown in Fig. 8 can be constructed by installing the precast blocks PB by the lowering step and so forth shown in Figs. 5 and 6. The configuration of the combustion chamber 13 as shown in Fig. 8 allows the coke oven 1 to be constructed with the multiple precast blocks PB installed on the corbel 16 and the rails R provided on the upper part of the coke oven 1.

[0031] When the precast block PB is designed so that its joint end face SE is located in the under-rail region BR, if it is small (short in the longitudinal direction FD), the wire 3 may come into contact with the rail R during the lowering step and the installation step. However, because the small precast block PB is lightweight, even if the wire 3 comes into contact with the rail R, it can be relatively easily shifted by human effort to a position directly above the intended installation position SPB. Even when installing the small precast block PB, it is positioned such that its joint end face SE is located in the under-rail region BR.

[0032] As described above, the precast blocks PB are designed with shapes corresponding to their installation positions and are manufactured accordingly, and then installed inside the coke oven 1 to form the combustion chamber 13. The combustion chamber 13 is designed to be constructed by installing the precast blocks PB of various shapes at predetermined positions.

[0033] When suspending and lowering the precast block PB by the wire 3, it is necessary to prevent the precast block PB from tilting. To keep the precast block PB level, the gripping device 4 should grip it near its center of gravity. As shown in Fig. 4, if the combustion chamber 13 is designed such that the center of gravity of the precast block PB, at its intended installation position SPB, falls within the under-rail region BR, it becomes difficult to install that precast block PB in the coke oven 1. In contrast, if the centers of gravity of all the precast blocks PB are positioned away from the under-rail region BR, the combustion chamber 13 can be constructed.

[0034] If the length of the precast block PB in the longitudinal direction FD is greater than twice the width of the rail R, the center of gravity does not lie within the under-rail region BR, as long as one of the joint end faces SE is located in the under-rail region BR. In the preparation step, the precast blocks PB with appropriate lengths in the longitudinal direction FD are prepared so that the joint end face SE, where laterally adjacent precast blocks PB are joined, can be located in the under-rail region BR. In the embodiment, the precast blocks PB of appropriate lengths are designed in such a way that the joint end faces SE located one above the other do not align at the same position in the longitudinal direction FD. These precast blocks PB are then prepared so that the combustion chamber 13 can be constructed using them. Even in the case of the small precast block PB having a length in the longitudinal direction FD that is smaller than twice the width of the rail R, when the center of gravity of the precast block PB is designed not to lie within the under-rail region BR, the precast block PB can be installed such that part of it is positioned in the under-rail region BR, without the wire 3 coming into contact with the rail R.

[0035] Moreover, regardless of the sizes of the precast blocks PB, if the center of gravity of each of the precast blocks PB, which is partially located in the under-rail region BR, is positioned outside the under-rail region BR, the rail R does not obstruct the wire 3 during installation of the precast block PB. Therefore, by designing the center of gravity of each of the precast blocks PB, which is partially located in the under-rail region BR, is positioned outside the under-rail region BR, and positioning and installing them accordingly, the rail R does not interfere with the wire. When designing the combustion chamber 13 and the precast blocks PB, it is preferable to arrange each of precast blocks PB whose one joint end face SE is located in the under-rail region BR such that its center in the longitudinal direction FD is slightly offset from the under-rail region BR.

[0036] By installing the precast block PB whose length is greater than twice the width of the rail R in the under-rail region BR, the rail R is less likely to obstruct the wire 3. As described above, if the precast block PB is small, it is lightweight and therefore is relatively easily moved to a position above the intended installation position SPB, even if the wire 3 comes into contact with the rail R during installation. Furthermore, regardless of the sizes of the precast blocks PB, the precast blocks PB are installed by being shallowly inserted from both sides in the width direction of the rail R, respectively, so that the rail R is less likely to obstruct the wire 3 suspending the precast blocks PB.

[0037] By moving each of the precast blocks PB1 which is partially located in the under-rail region BR in the longitudinal direction FD so that its joint end face SE is positioned in the under-rail region BR, the precast block PB is installed in the intended installation position SPB. As a result, it is possible to arrange the precast blocks PB substantially in the under-rail region BR with no gaps. Moreover, if each of the precast blocks PB is positioned and installed so that its center of gravity does not lie within the under-rail region BR, installation can be carried out easily even in the case where short precast blocks PB are used.

[0038] In the embodiment, the precast blocks PB are used to form the combustion chamber 13, and the same applies to the precast blocks for forming the oven ceiling 15. Moreover, in the embodiment, the precast block PB is suspended by the traveling crane 2 movably provided on the rails R, although other types of cranes may be used as long as the precast block PB is suspended from above the rails R.

[0039] For the rest, the specific configurations are not limited to the embodiment, and the design can be changed without departing from the scope of the present invention.List of reference signs

[0040] 1 coke oven 11 regenerative chamber 12refractory brick 13 combustion chamber 14 carbonization chamber 15 oven ceiling 16 corbel 2 traveling crane 21 crane frame 22 crane rail 23 mobile rail 24 wheel 25 winch 3 wire 4 gripping device PB precast block PB1 precast block PB2 precast block CS1 side surface SE joint end face SE1 joint end face SE2 joint end face SPB intended installation position TR transfer range R rail RM rail body PB rail base BR under-rail region FD longitudinal direction SD battery direction

Examples

Embodiment Construction

[0018]With reference to Figs. 5 and 6, a method of installing the precast block PB1 in the coke oven 1 provided with the rails R on the upper part of the coke oven 1 will be described. Similar to Fig. 4, each of Figs. 5 and 6 is a cross-sectional view showing the coke oven 1, which is perpendicular to the battery direction SD. In Figs. 5 and 6, the horizontal direction corresponds to the longitudinal direction FD, and the depth direction corresponds to the battery direction SD. Also similar to Fig. 4, the precast block PB1 refers to a precast block that is being suspended for installation, while the precast block PB2 refers to a precast block that has already been installed.

[0019]As shown in Figs. 5 and 6, the rail R on which the wheel 24 of the traveling crane 2 is placed includes a rail body RM contacting the wheel 24, and a rail base RB connected to the bottom of the rail body RM to support the rail body RM. The rails R extending in the battery direction SD are provided on the up...

Claims

1. A method of installing precast blocks (PB) in a coke oven (1) provided with rails (R) on an upper part of the coke oven (1), the method comprising: a preparation step of preparing a precast block (PB) such that a joint end face SE where a laterally adjacent precast block (PB) is joined is positioned in an under-rail region (BR); a lowering step of suspending and lowering the precast block (PB) from the upper part of the coke oven (1) without interfering with the rails (R); a moving step of moving the precast block (PB) in a longitudinal direction (FD) such that, for each of the precast blocks (PB) partially located in the under-rail region (BR), one of its joint end faces (SE) is located in the under-rail region (BR); and an installation step of installing the precast block (PB) in an intended installation position (SPB).

2. The method of installing precast blocks (PB) according to claim 1, wherein, in the installation step, for each of the precast blocks (PB) partially located in the under-rail region (BR), its center of gravity does not lie within the under-rail region (BR).

3. The method of installing precast blocks (PB) according to one of claims 1 and 2, wherein the precast block (PB) is suspended and lowered by a traveling crane (2) movably provided on the rails (R).

4. The method of installing precast blocks (PB) according to one of claims 1 and 2, wherein the precast blocks (PB) are sequentially positioned and installed from the center of the coke oven (1) in the longitudinal direction (FD).

5. A coke oven (1) comprising: rails (R) provided on an upper part of the coke oven (1); a corbel (16); and combustion chambers (13) formed by installing a plurality of precast blocks (PB) on the corbel (16), wherein, for each of the precast blocks (PB) partially located in an under-rail region (BR), one of its joint end faces (SE) is located in the under-rail region (BR).

6. The coke oven (1) according to claim 5, wherein, for each of the precast blocks (PB) partially located in the under-rail region (BR), its center of gravity does not lie within the under-rail region (BR).

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