Method for installing precast block and coke oven

Abstract

To easily install a precast block even if there is a rail on a coke oven when the precast block is installed in the coke oven.SOLUTION: A method for installing a precast block according to the present invention is a method for installing a precast block in a coke oven including a rail on an oven top, the method including a preparation step of preparing the precast block such that a connection-side end portion at which the precast blocks laterally adjacent to each other are connected to each other is located directly below the rail, and a hanging-down step of hanging down the precast block from an upper side of the coke oven while avoiding the rail. The method includes a moving step of moving the precast block in the furnace length direction so that the connection-side end is positioned immediately below the rail, and an installation step of installing the precast block at an installation planned position.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a method for installing precast blocks and a coke oven. [Background technology]

[0002] In this application, the direction in which coke is pushed out of a coke oven is referred to as the oven length direction (FD), and the horizontal direction perpendicular to the oven length direction (FD) is referred to as the oven battery direction (SD). Precast blocks (PB) are referred to as the oven length direction (FD) and oven battery direction (SD) depending on their orientation when installed in the coke oven. In the drawings, the oven length direction is indicated by a double-headed arrow marked FD, and the oven battery direction is indicated by a double-headed arrow marked SD.

[0003] Fig. 1 is a cross-sectional view of a coke oven 1 viewed from the pusher side. As shown in Fig. 1, in the coke oven 1, a large number of firebricks 12 are stacked on a corbel 16 provided above a regenerator chamber 11 to construct a plurality of combustion chambers 13, thereby forming a plurality of combustion chambers 13 and a plurality of coking chambers 14. In Fig. 1, a flue (not shown) is formed inside the combustion chamber 13, and a coking chamber 14 is formed between two combustion chambers 13. The coke oven 1 in Fig. 1 is provided with a plurality of combustion chambers 13, coking chambers 14, etc. (not shown) on both sides in the furnace battery direction SD.

[0004] Coke ovens 1 are used under harsh conditions of high heat, and continued use leads to deterioration over time. If a hole develops in the combustion chamber 13 due to deterioration over time, it can be repaired by forming a thermal spray layer on the surface of the combustion chamber 13, as described in Patent Document 1. However, deterioration over time can cause the refractory bricks 12 of the combustion chamber 13 to shift position, causing them to protrude toward the coke chamber 14. When such deterioration occurs, the protrusion becomes an obstacle when pushing out the coke carbonized in the coke chamber 14, making it difficult to push out the coke.

[0005] In a coke oven 1, when refractory bricks 12 protrude into a combustion chamber 13 due to deterioration over time, the refractory bricks 12 must be demolished and repaired. In this case, as disclosed in Patent Documents 2 and 3, one of the multiple combustion chambers 13 that has deteriorated and become misaligned is dismantled, and a new combustion chamber 13 is constructed. In FIG. 1, the three combustion chambers 13 in the re-installation range TR indicated by diagonal lines and the furnace ceiling 15 above them are dismantled and reconstructed.

[0006] A new combustion chamber 13 can be reconstructed by installing a large number of precast blocks PB larger than the refractory bricks 12 (see Patent Document 3). FIG. 2 shows a perspective view of a combustion chamber 13 constructed in the transfer area TR. The combustion chamber 13 is reconstructed using multiple precast blocks PB along the furnace length direction FD indicated by the double arrow. In the embodiment shown in FIG. 2, three combustion chambers 13 are constructed in the transfer area TR in the furnace battery direction SD. A coking chamber 14 is formed between adjacent combustion chambers 13. The combustion chambers 13 and the coking chambers 14 are formed alternately in the furnace battery direction SD. The precast blocks PB have the width of the combustion chamber 13 in the furnace battery direction SD, and the combustion chamber 13 is formed by stacking multiple precast blocks PB. A space for a flue is provided inside each precast block PB. A flue is formed in the internal space of the combustion chamber 13, which is formed by stacking the precast blocks PB. A furnace ceiling 15 is installed above the combustion chambers 13 and the coking chambers 14. The furnace ceiling 15 in FIG. 2 is in a state before casters are laid on the upper side to make it flat.

[0007] Figure 3 shows the installation of multiple precast blocks PB in the transfer area TR. Similar to Figure 1, Figure 3 is a cross-sectional view of the coke oven 1 perpendicular to the furnace length direction FD as viewed from the pusher side. Figure 3 also shows the state in which a combustion chamber 13 is being created using precast blocks PB in the transfer area TR indicated by the dotted line. The precast block PB being hung for installation is referred to as precast block PB1, and the precast block PB that has already been installed is referred to as precast block PB2. When installing a precast block PB in the transfer area TR, as shown in Figure 3, precast block PB1 is hung from the top of the coke oven 1 and installed like precast block PB2.

[0008] To reconstruct the combustion chamber 13 and the coke chamber 14, a traveling crane 2 for transporting precast blocks PB and the like is provided above the coke oven 1 in FIG. 3. The traveling crane 2 is lifted above the furnace ceiling 15 by a crane vehicle or the like and placed on rails R for a coal loading car (not shown). The rails R extend in the furnace battery direction SD. The traveling crane 2 shown in FIG. 3 includes a crane frame 21, crane rails 22, movable rails 23, wheels 24, and a winch 25. Two crane rails 22 are attached to the top of the crane frame 21 so as to extend in the furnace length direction FD. In addition, a movable rail 23 extending in the furnace battery direction SD is provided so as to straddle the two crane rails 22. The traveling crane 2 is placed on the rails R by the wheels 24. The movable rails 23 extending in the furnace battery direction SD can move along the crane rails 22 in the furnace length direction FD. The winch 25, which is movably attached to the moving rail 23, can move in the furnace battery direction SD and the furnace length direction FD relative to the crane frame 21. The winch 25 can wind up the wire 3, and below the wire 3, the precast block PB1 is clamped by the gripping device 4, and the precast block PB1 is gripped by the gripping device 4 on its side surface CS1. The side surface CS1 is the surface that faces the coking chamber 14 when the combustion chamber 13 is formed with the precast block PB1. Wheels 24 are provided below the crane frame 21, and the traveling crane 2 can move in the furnace battery direction SD on the rail R. The rail R is provided above the furnace ceiling 15, but is suspended in the air above the transfer range TR.

[0009] In Figure 3, precast block PB2 is installed on top of corbel 16 located below the transfer area TR. Another precast block PB1 is suspended above the installed precast block PB2 from a traveling crane 2. As described above, a rail R on which a coal loading car (not shown) runs is provided above the coke oven 1, and the traveling crane 2 is installed on the rail R to suspend precast block PB1 from above, thereby constructing the combustion chamber 13. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent Publication No. 2021-130783 [Patent Document 2] International Publication No. 2012 / 078036 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-137447 Summary of the Invention [Problem to be solved by the invention]

[0011] As shown in Figure 3, rails R remain at the top opening of the transfer area TR after the combustion chamber 13 has been dismantled. This can make it difficult to install precast blocks PB1. Figure 4 is a cross-sectional view of a coke oven 1 showing a state in which precast blocks cannot be installed. This shows a cross-sectional view of the coke oven 1 perpendicular to the oven battery direction SD. In Figure 4, the horizontal direction is the oven length direction FD, and the depth direction is the oven battery direction SD. Figure 4 shows a cross-sectional view from the direction of arrow F in Figure 3. Figure 3 is the cross-sectional view from the direction of arrow S in Figure 4. The location of arrow F is the transfer area TR, and there is no combustion chamber 13 in the area from above the corbel 16 to the rails R. Furthermore, as shown in Figure 4, two rails R remain above the transfer area TR. Figure 4 shows the state in which a combustion chamber 13 is being created using precast blocks PB in the transfer area TR.

[0012] In Figure 4, the winch 25 is moving in the direction of arrow M to install precast block PB1, which is held by the gripping device 4 to the right of multiple precast blocks PB2, at the planned installation position SPB indicated by the dotted line. Precast block PB1 is being lowered from above the coke oven 1, avoiding the rail R. However, rail R obstructs the wire 3, which is attempting to move in the direction of arrow M, preventing the suspended precast block PB1 from moving above the planned installation position SPB. As a result, it is difficult to install precast block PB1 at the planned installation position SPB below rail R. If a combustion chamber 13 is designed with the planned installation position SPB shown in Figure 4, rail R will obstruct the construction of the combustion chamber 13 on-site, making it difficult to build. The same situation occurs when a new coke oven 1 is constructed and the combustion chamber 13 is designed with rail R at the top, as shown in Figure 4.

[0013] An object of the present invention is to make it possible to easily install precast blocks in a coke oven even when rails are present above the oven. [Means for solving the problem]

[0014] In one embodiment of the present invention, a method for installing precast blocks is a method for installing precast blocks in a coke oven having a rail above the oven, and is characterized by comprising the following steps: a preparation step for preparing the precast blocks so that the connecting end portions where laterally adjacent precast blocks connect are located directly below the rail; a hanging step for hanging the precast blocks and lowering them from above the coke oven while avoiding the rail; a moving step for moving the precast blocks in the direction of the oven length so that the connecting end portions of all precast blocks that have a portion located directly below the rail are located directly below the rail; and an installation step for installing the precast blocks at their intended installation positions.

[0015] In addition, one embodiment of the present invention relates to a coke oven having a rail on the furnace and a plurality of precast blocks placed on a corbel to form a combustion chamber and a carbonization chamber, and is characterized in that, in all of the precast blocks whose parts are located directly below the rail, one connecting side end is located directly below the rail. [Effects of the Invention]

[0016] According to the present invention, when precast blocks are installed in a coke oven, the precast blocks can be easily installed even if rails are present above the oven. [Brief explanation of the drawings]

[0017] [Figure 1] Cross section of a coke oven seen from the pusher side. [Figure 2] FIG. 1 is a perspective view of a combustion chamber and other components formed from precast blocks. [Figure 3] Cross section of a coke oven showing precast blocks hanging in the transfer area. [Figure 4] Cross section of a coke oven showing the state where precast blocks cannot be installed. [Figure 5] FIG. 1 is a cross-sectional view of a coke oven showing a state in which a precast block is being moved in an embodiment of the present invention. [Figure 6] FIG. 2 is a cross-sectional view of a coke oven showing the state in which a precast block is being installed in an embodiment of the present invention. [Figure 7] An example of a combustion chamber made of precast blocks that cannot be installed. [Figure 8] A combustion chamber made of precast blocks according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Using Figures 5 and 6, we will explain how to install precast block PB1 in a coke oven 1 that has rails R above the oven. Similar to Figure 4, Figures 5 and 6 show cross-sectional views of the coke oven 1 perpendicular to the oven battery direction SD. In Figures 5 and 6, the horizontal direction is the oven length direction FD, and the depth direction is the oven battery direction SD. Also, similar to Figure 4, the precast block PB being hung for installation will be referred to as precast block PB1, and the installed precast block PB will be referred to as precast block PB2.

[0019] As shown in Figures 5 and 6, the rail R on which the wheels 24 of the traveling crane 2 ride comprises a rail body RM that contacts the wheels 24 and a rail support RB that connects to the bottom of the rail body RM and supports the rail body RM. The rail R is installed above the furnace extending in the furnace battery direction SD for use with a coal loading car (not shown), with the furnace length direction FD being its width direction. The rail R has the width of the rail support RB in the furnace length direction FD. Where the furnace ceiling 15 is located, the rail support RB is embedded in the furnace ceiling 15, and the rail body RM protrudes upward from the top surface of the furnace ceiling 15.

[0020] FIG. 5 shows a state in which a precast block PB1 is being moved in an embodiment of the present invention. The cross-sectional view from the direction of arrow S in FIG. 5 is the same as the cross-sectional view from the direction of arrow S in FIG. 4, as shown in FIG. 3. In the cross-section of FIG. 5, located at arrow F in FIG. 3, the area below the rail R is the transfer area TR, so the furnace ceiling 15 and combustion chamber 13 are not present, and the rail R is suspended in midair. In FIG. 5, one precast block PB2 is installed on a corbel 16. Another precast block PB1 is suspended from the traveling crane 2. FIG. 5 shows a lowering process in which the precast block PB1 is suspended and lowered from above the coke oven 1 in the direction of arrow D, avoiding the rail R, and a moving process in which the precast block PB1 is moved in the furnace length direction FD, as shown by arrow M. In the lowering process in this embodiment, the precast block PB1 is lowered from inside the crane frame 21 into the transfer area TR, avoiding the rail R.

[0021] A crane rail 22 extending in the furnace length direction FD is attached to the top of the crane frame 21, and a movable rail 23 extending in the furnace battery direction SD is attached to the crane rail 22. The movable rail 23 extending in the furnace battery direction SD can move in the furnace length direction FD along the crane rail 22. A winch 25 movably attached to the movable rail 23 can move in the furnace battery direction SD and the furnace length direction FD. The winch 25 can wind up the wire 3, and a precast block PB1 is held below the wire 3 by a gripping device 4.

[0022] The precast blocks PB used to construct the combustion chamber 13, such as precast block PB1 and precast block PB2, are designed and manufactured to have a size and shape appropriate for the installation location within the coke oven 1. Precast block PB1 and precast block PB2 shown in Figure 5 have the same height but different lengths in the furnace length direction FD. Note that some or almost all of the precast blocks PB constituting the combustion chamber 13 may have the same length in the furnace length direction FD.

[0023] In Figure 5, the precast block PB2 that has already been installed has been installed in the coke oven 1 based on the center of the furnace length direction FD. Then, in Figure 5, precast block PB1 is installed sequentially from this precast block PB2 to the left and right of Figure 5. By installing the precast blocks sequentially while being positioned from the center of the furnace length direction FD, the precast blocks PB can be installed in accurate positions. In Figure 5, the precast blocks PB are installed in the first row from the bottom, but for the second row and beyond, the precast blocks PB are similarly positioned from the center of the furnace length direction FD and installed sequentially.

[0024] In Figure 5, precast block PB2, which is already placed on corbel 16, does not have rail R above it. Therefore, when installing precast block PB2, it can be lowered almost vertically from the crane frame 21 of traveling crane 2. However, when installing precast block PB1 below rail R, simply lowering precast block PB1 vertically from traveling crane 2 is not enough to install it in the desired position. Therefore, in the lifting process, precast block PB1 is lowered from above coke oven 1 to the transfer area TR, avoiding rail R, to the state shown in Figure 5. Then, in the moving process, winch 25 is moved in the direction of arrow M. This adjusts precast block PB1 so that a portion of it is below rail R, and precast block PB1 is moved above planned installation position SPB. When precast block PB1 is moved to planned installation position SPB, its connection end SE1 connects to the connection end SE2 of precast block PB2.

[0025] FIG. 6 is a cross-sectional view of a coke oven 1 showing the installation of a precast block PB1 according to an embodiment of the present invention. FIG. 6 shows the installation of a precast block PB1 suspended above a corbel 16 during the installation process. A portion of this precast block PB1 is located directly below the rail BR. After the state shown in FIG. 6, another precast block PB, partially located directly below the rail BR, is installed adjacent to the side of precast block PB1. The connection end SE1 shown in FIG. 6 is the location where laterally adjacent precast blocks connect, and is located directly below the rail BR. FIG. 6 shows the final state of the installation process in which precast block PB1, partially located directly below the rail BR, is moved and installed so that the connection end SE1 is located directly below the rail BR.

[0026] From the state shown in Figure 5, precast block PB1 is moved in the direction of arrow M above the intended installation position SPB using the moving process. Then, in the installation process shown in Figure 6, wire 3 is extended from winch 25 to lower precast block PB1 in the direction of arrow D. This allows precast block PB1 to be installed under rail R, as shown in Figure 6. During the lowering, moving, and installation processes described in Figures 5 and 6, wire 3 does not come into contact with rail R, so rail R does not interfere with installation. Furthermore, precast block PB1, installed by hanging using wire 3 as shown in Figure 6, is partially located directly below rail BR, with its connecting end SE1 located directly below rail BR. By installing precast block PB1 as shown in Figures 5 and 6, it is possible to position and install all precast blocks PB1 so that one connecting end SE1 is located directly below rail BR.

[0027] The thickness of the precast blocks PB in the oven battery direction SD varies depending on their installation position within the combustion chamber 13. The combustion chamber 13 is formed so that the pusher side is thicker and the coke side is thinner, and the carbonization chamber 14 becomes wider as it approaches the coke side. The precast blocks PB are manufactured with their installation position and shape designed in advance, and are transported to the coke oven 1 site in a preparation process. They are then assembled in the coke oven 1 using a hanging process or other process to form the combustion chamber 13. The combustion chamber 13 is designed so that precast blocks PB of different shapes are installed and assembled in predetermined positions. In this way, when constructing the combustion chamber 13, the installation position and shape of each precast block PB are designed. Then, the precast blocks PB are manufactured according to the designed shape and installed according to the designed installation position.

[0028] In this embodiment, all precast blocks PB installed in the BR directly below the rail are installed so that one connection end SE is located directly below the rail. The precast blocks PB and the combustion chamber 13 to be constructed are designed so that the connection end SE where laterally adjacent precast blocks PB connect is located directly below the rail BR. The designed precast blocks PB are then manufactured and prepared at the coke oven 1 site in a preparation process. In this way, in the BR directly below the rail, a precast block PB is inserted from one side of the rail R installed on the furnace in the width direction during the moving process, and another precast block PB is inserted from the other side. By inserting the precast blocks PB one by one from both sides of the rail R in the width direction, the precast blocks PB are inserted shallowly into the BR directly below the rail, and the rail R is less likely to interfere with the wire 3 suspending the precast blocks PB. In this way, by positioning and installing all precast blocks PB whose parts are located directly below the rail BR so that the connection side end SE is located directly below the rail BR, it is possible to prevent the rail R from becoming an obstacle to the wire 3.

[0029] Figure 7 shows an example of a combustion chamber 13 with a precast block PB that cannot be installed. The precast block PB shown with diagonal lines is located in the area BR directly below the rail, but neither of the connecting end portions SE on either side is located directly below the rail BR. Even if the combustion chamber 13 and the precast block PB to be used in the combustion chamber 13 are designed and manufactured and prepared on-site at the coke oven 1, as shown in Figure 4, the rail R will obstruct the wire 3, making it impossible to move the precast block PB to its intended installation position SPB. The precast block PB shown with diagonal lines is not manufactured so that the connecting end portions SE, where adjacent precast blocks PB connect to each other laterally, are located directly below the rail BR.

[0030] Figure 8 shows a combustion chamber 13 made of precast blocks PB according to this embodiment. As shown in Figure 8, in all precast blocks PB whose parts are located directly below the rail BR, one connection side end SE is located directly below the rail BR. The combustion chamber 13 in Figure 8 can be created by installing precast blocks PB using a hanging process or the like as shown in Figures 5 and 6. By forming the combustion chamber 13 in Figure 8, a coke oven 1 can be created in which a rail R is provided above the furnace and multiple precast blocks PB are installed on corbels 16 to form the combustion chamber 13.

[0031] In addition, for small precast blocks PB that are short in the furnace length direction FD, even if the connection side end SE is located at BR directly below the rail, the wire 3 may come into contact with the rail R during the lifting and installation processes. However, because small precast blocks PB are light, even if the wire 3 comes into contact with the rail R, it is relatively easy to manually shift it to above the intended installation position SPB. Also, when installing a small precast block PB, the connection side end SE is located at BR directly below the rail.

[0032] As mentioned above, the precast blocks PB are manufactured with the installation position and shape designed in advance, and are assembled inside the coke oven 1 to form the combustion chamber 13. The combustion chamber 13 is designed so that precast blocks PB of different shapes can be installed and assembled in predetermined positions.

[0033] When hanging the precast block PB with the wire 3, it is necessary to prevent the precast block PB from tilting. To do this, the precast block PB cannot be grasped by the grasping device 4 at a position significantly different from its center of gravity. If a combustion chamber 13 is designed with a precast block PB whose center of gravity is located directly below the rail BR at the intended installation position SPB, as shown in Figure 4, it will be difficult to install that precast block PB in the furnace. Conversely, the combustion chamber 13 can be assembled if the centers of gravity of all precast blocks PB are not located directly below the rail BR.

[0034] For precast blocks PB whose length in the furnace length direction (FD) is more than twice the width of the rail R, if one connection end SE is located directly below the rail BR, the center of gravity will not be located directly below the rail BR. In the preparation process for precast blocks PB, precast blocks PB with an appropriate length in the furnace length direction (FD) can be prepared so that the connection end SE connecting laterally adjacent precast blocks PB is located directly below the rail BR. In this embodiment, precast blocks PB with an appropriate length and a combustion chamber 13 using precast blocks PB are designed and prepared so that the upper and lower connection end SEs are not located in the same position in the furnace length direction (FD). Even for small precast blocks whose length in the furnace length direction (FD) is less than twice the width of the rail R, if the center of gravity of the precast block PB is designed not to be located directly below the rail BR, the wire 3 can be installed so that it does not touch the rail R and is partially located directly below the rail BR.

[0035] Regardless of the size of the precast blocks PB, if the center of gravity of all precast blocks PB that are partially located directly below the rail BR is not located at the BR directly below the rail, the rail R will not interfere with the wire 3 when installing the precast blocks PB. Therefore, if the precast blocks PB are positioned, designed, and installed so that the center of gravity of all precast blocks PB that are partially located directly below the rail BR is not located at the BR directly below the rail, the rail R will not interfere with the wire. When actually designing the combustion chamber 13 and precast blocks PB, it is preferable to consider that for precast blocks PB whose one connection side end SE is located at the BR directly below the rail, the center FD in the furnace length direction is slightly away from the BR directly below the rail.

[0036] If a precast block PB with a length greater than twice the width of the rail R is used for the BR directly below the rail, the rail R is less likely to obstruct the wire 3. Also, as mentioned above, small precast blocks PB are light, so even if the wire 3 comes into contact with the rail R during installation, it is relatively easy to shift it above the intended installation position SPB. Furthermore, regardless of the size of the precast blocks PB, by installing them one by one from both sides of the rail R in the width direction, the precast blocks PB are inserted shallowly into the BR directly below the rail, and the rail R is less likely to obstruct the wire 3 that suspends the precast blocks PB.

[0037] Therefore, for all precast blocks PB whose parts are located directly below the rail BR, if the precast blocks PB are moved in the furnace length direction FD so that the connection side end SE is located directly below the rail BR, and the precast blocks PB are installed at the intended installation position SPB, the precast blocks PB can basically be installed directly below the rail BR without any gaps. However, if the precast blocks PB are further positioned and installed so that the center of gravity of all precast blocks PB whose parts are located directly below the rail BR is not located directly below the rail BR, installation will be easier even when there are short precast blocks PB.

[0038] In the embodiment, the precast block PB forms the combustion chamber 13, but the same is true for the precast block that forms the furnace ceiling 15. In addition, in the embodiment, the precast block PB is suspended by a traveling crane 2 that is movably mounted on the rail R. However, other cranes may be used as long as the precast block PB is installed by being suspended from above the rail R.

[0039] Furthermore, the specific configuration is not limited to the embodiment, and the present invention also includes design changes and the like within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0040] 1. Coke oven 11 Heat storage chamber 12 Firebrick 13 Combustion chamber 14 Carbonization chamber 15 Furnace ceiling 16 Corbel 2 Traveling Crane 21 Crane frame 22 Crane Rail 23 Moving Rail 24 wheels 25 Winch 3 wire 4 Gripping device PB Precast Block PB1 Precast Block PB2 Precast Block CS1 side SE connection end SE1 connection end SE2 connection end SPB installation location TR Transshipment Range R rail RM rail body RB rail support BR Directly below the rail FD furnace length direction SD Furnace Batteries Direction

Claims

1. A method for installing precast blocks in a coke oven equipped with rails above the oven, comprising the steps of: a preparation process for preparing the precast blocks so that connection side ends where laterally adjacent precast blocks are connected are located directly below the rail; a lowering process of suspending the precast block and lowering it from above the coke oven while avoiding the rails; A moving process of moving the precast blocks in the furnace length direction so that the connection side end portions of all the precast blocks, some of which are located directly below the rail, are located directly below the rail; an installation step of installing the precast block at a planned installation position; A method for installing precast blocks, comprising:

2. The installation step includes: A method for installing precast blocks as described in claim 1, characterized in that the precast blocks are positioned and installed so that the center of gravity of all of the precast blocks, some of which are located directly below the rail, is not located directly below the rail.

3. 3. A method for installing precast blocks according to claim 1, wherein the precast blocks are suspended by a traveling crane movably mounted on the rails.

4. 3. The method for installing precast blocks according to claim 1, wherein the precast blocks are positioned in the coke oven from the center of the oven length and installed sequentially.

5. A coke oven having a combustion chamber formed by placing a plurality of precast blocks on a corbel and a rail on the furnace, A coke oven characterized in that, in all of the precast blocks whose parts are located directly below the rail, one connection side end is located directly below the rail.

6. 6. The coke oven according to claim 5, wherein the centers of gravity of all the precast blocks, some of which are located directly below the rail, are not located directly below the rail.

Images