JP4538396B2 - How to make a sinking box - Google Patents

Description

  The present invention relates to a method for manufacturing a submerged box (a box for a submerged tunnel), and more particularly to an assembly method for a submerged box.

As a subsidence method applied to the construction of submarine tunnels, etc., the subsidence box is divided and manufactured on land, and both ends of each of the divided parts are closed with temporary bulkheads and crushed to the construction point and submerged on the bottom of the water. A method of constructing a tunnel by joining adjacent portions and removing a temporary partition is known.
The submerged box is mainly composed of lower floor slab, upper floor slab, side wall, middle wall and partition wall, and is generally reinforced concrete structure, but in recent years, a synthetic structure submerged box that is manufactured by integrating steel plate and concrete has also been developed. Has been.

  As a composite structure, for example, a method of sequentially placing concrete while making a steel shell with a steel plate in the order of a lower floor slab, a side wall, a middle wall, a partition wall, and an upper floor slab is known (see Patent Documents 1 and 2). Recently, a full sandwich structure has been devised in which a steel shell is formed by an outer shell steel plate and a web steel plate, and concrete is placed in a gap in the steel shell, that is, a concrete is sandwiched between outer shell steel plates.

In such a full sandwich structure, the steel shell forms a structural body, and sufficient rigidity and strength can be secured only by the steel shell. It is possible to cast.
In manufacturing the steel shell, the steel shells of the lower floor slab, the upper floor slab, the side wall, the middle wall, and the partition wall are divided into a plurality of small blocks and manufactured in advance in separate processes. By assembling the steel shell block, it is possible to produce a steel shell for the entire submerged box.

Therefore, in the production of a full sandwich structure, usually, the small steel shell block of the lower floor slab is first welded to form the steel shell of the lower floor slab as a whole. Each small steel shell block is welded and joined to the steel shell of the lower floor slab, and finally, the small steel shell block of the upper floor slab is welded and joined to the upper end of the steel shell of the side wall, the middle wall, and the partition wall. I make shells.
JP-A-8-260494 JP-A-9-295313

  By the way, when assembling the steel shell of the submerged box by dividing the steel shell of the lower floor slab, the upper floor slab, the side wall, the middle wall, and the partition wall into a plurality of small steel shell blocks as described above, it is generally transported with a jib crane etc. In this way, when carrying with a jib crane or the like, there is a restriction that the small steel shell block cannot be made so large in order to reduce the carrying load.

However, if each small steel shell block is reduced in size and the number of small steel shell blocks is increased, the number of welding steps for assembling these small steel shell blocks will increase, and it will take time to assemble and in a short period of time. There is a problem that production is difficult.
In addition, the steel shells of the side wall, middle wall, and partition wall are assembled in order from the steel shell of the lower floor slab, and finally the steel shell of the upper floor slab is welded to each upper end of the steel shell of the side wall, middle wall, and partition wall. Then, there is a problem that the welding work of the steel shell of the upper floor slab has to be a high place work, and furthermore, since there are many welding work from below, the welding work posture tends to become unstable, and the work efficiency There is a problem that it is difficult to secure sufficient welding quality as well.

  The present invention has been made to solve such problems, and the object of the present invention is to produce a steel shell for a submerged box in a short period of time while ensuring high safety, high work efficiency, and high quality. It is to provide a method of manufacturing a simple sinking box.

  In order to achieve the above-described object, the method of manufacturing a submerged box according to claim 1 is a method of manufacturing a submerged box formed by combining a shell steel plate and a web steel plate to form a steel shell, and constitutes the submerged box. A first step of further dividing the lower floor slab, the upper floor slab, the side wall and the intermediate wall to produce a plurality of small steel shell blocks, respectively, and joining the plurality of small steel shell blocks of the lower floor slab to each other The second step of manufacturing the steel shell block, and the plurality of small steel shell blocks of the upper floor slab are inverted upside down, and the small side wall corresponding to the upper surface of each small steel shell block of the upper floor slab inverted. A third step of manufacturing a plurality of united steel shell blocks by joining one end of each of the steel shell block and the small steel shell block of the intermediate wall; and Place it at each corresponding position on the top surface of the shell block Joining the other ends of the small steel shell block on the side wall and the small steel shell block on the intermediate wall to the upper surface of the lower floor slab shell block, and adjoining the combined steel shell blocks And a fourth step of manufacturing a steel shell of the entire submerged box.

  The method for manufacturing a submerged box according to claim 2 is the method according to claim 1, wherein the combined steel shell block is manufactured at least in the third step and the small steel shell block on the side wall of the combined steel shell block in the fourth step and The joining of the other end of the small steel shell block of the intermediate wall to the upper surface of the lower floor slab shell block and the joining of the adjacent combined steel shell blocks are performed in parallel.

  The method for manufacturing a submerged box according to claim 3 uses a gantry crane according to claim 1 or 2, and in the fourth step, the united steel shell block is suspended by a plurality of wires of the gantry crane, In the suspended state, a part of the plurality of wires is exchanged and inverted, and transferred to and placed at the corresponding positions on the upper surface of the lower floor steel shell block.

  According to the method for manufacturing a submerged box according to claim 1, each end of the small steel shell block on the side wall and the small steel shell block on the intermediate wall are respectively joined to the upper surface of each small steel shell block of the upper floor plate placed upside down. Then, a plurality of united steel shell blocks are manufactured (third step), and the plurality of united steel shell blocks are inverted and placed at corresponding positions on the upper surface of the lower floor slab shell block, respectively. Join the other ends of the small steel shell block on the side wall of the combined steel shell block and the small steel shell block on the intermediate wall to the upper surface of the lower floor slab shell block, and join the adjacent combined steel shell blocks together to the entire submerged box Since the steel shell is manufactured (fourth step), the joining is welding, and the small steel shell block of the upper floor slab is connected to each end of the small steel shell block of the side wall and the small steel shell block of the intermediate wall. Welding work is no longer work at high altitude, and basic Welding work is down work.

This eliminates the need to install a high platform and work on a high platform when manufacturing a steel shell for a buried box, thus ensuring high safety and high work efficiency, and ensuring a stable welding work posture. Therefore, sufficient welding quality can be ensured.
According to the manufacturing method of the submerged box of claim 2, at least the production of the combined steel shell block (third step), the small steel shell block on the side wall of the combined steel shell block, and the other end of the small steel shell block on the intermediate wall Welding work on the lower floor slab shell block (large process) was performed in parallel with the joining of the lower floor slab shell block to the upper surface and the joining of adjacent coalescence shell blocks (fourth step). Assembly) and welding of the combined steel shell block (medium assembly) can be performed at the same time, while ensuring high safety and sufficient welding quality, further improving work efficiency and shortening the production period Can be achieved.

  According to the method for manufacturing a submerged box according to claim 3, since a gantry crane is used, a relatively heavy steel shell block can be transferred compared to using a jib crane, and each of a lower floor slab, an upper floor slab, a side wall and an intermediate wall can be transferred. It is possible to make the small steel shell block and the combined steel shell block into relatively large blocks. As a result, welding work on the lower floor slab shell block (large assembly) and union steel shell block welding work (medium assembly) is minimized, while each small steel shell block is installed in the factory. Automated plate joint welding (submerged arc welding, etc.) can be used frequently, can reduce variations in welding quality and ensure higher welding quality, and can improve the overall dimensional accuracy of the steel shell . Furthermore, the number of transfers of the small steel shell block and the combined steel shell block is reduced, and the working efficiency can be improved.

  Moreover, by using a gantry crane, the top and bottom of the united steel shell block can be easily reversed, and the work efficiency can be further improved.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall configuration diagram showing the submerged box steel shell 1 applied to the method for manufacturing a submerged box according to the present invention.
The submerged box is a structure used for a submarine tunnel, etc., and the submerged box steel shell 1 is a structure in which a steel shell is formed by an outer shell steel plate and a web steel plate, and concrete is placed in a void in the steel shell, that is, an outer shell. It forms a skeleton of a so-called full sandwich structure in which concrete is sandwiched between shell steel plates.

  As shown in the figure, the submerged box steel shell 1 is mainly composed of a lower floor slab 10, an upper floor slab 20, a side wall 30, a middle wall 40, a partition wall 50, and end shells 60, 21, 31, 31, 41, It consists of 51 and 61, and these are welded and comprised. The bulkhead 70 is a temporary partition wall for closing the opening of the steel shell block 61 at the end 60 when the completed submerged box steel shell 1 is circulated to the installation location.

  By the way, since the submerged box steel shell 1 is a structure having a total weight exceeding 1,000 tons, the lower floor slab 10, the upper floor slab 20, and the side wall are shown in the drawing as shown with a dividing line. 30, the middle wall 40, and the partition wall 50 are further divided to produce a plurality of small steel shell blocks 12, 22, 32, 42, 52, respectively, which are assembled. Specifically, the lower floor slab 10 and the upper floor slab 20 are divided into, for example, 10 parts, and the small steel shell block 12 and the small steel shell block 22 have a large small steel shell block 12a on one side for convenience of assembly. 22a, and the other side is composed of small small steel shell blocks 12b and 22b.

The structure of the small steel shell blocks 12, 22, 32, 42, 52, that is, the plate structure of the outer shell steel plate and the web steel plate, is well known, and detailed description thereof is omitted here.
Hereinafter, the assembly method according to the present invention of the submerged box steel shell 1 configured as described above will be described.

The small steel shell blocks 12, 22, 32, 42, 52 are manufactured by using, for example, automated plate joint welding (such as submerged arc welding) in the factory (first process).
Of these small steel shell blocks 12, 22, 32, 42, 52, the small steel shell block 12 of the lower floor slab 10 is, as shown in FIG. 2, a wire bundle 102 of a Goliath crane (gantry crane) 100. , 104 and sequentially transferred to a large assembly yard (for example, dock) 200. Specifically, in the large assembly yard 200, for example, a large number of wooden bases 202 for placing a plurality of small steel shell blocks 12 are installed in advance, and each small steel shell block 12, that is, each small steel shell block, is installed. 12a and 12b are respectively placed on a plurality of mounts 202 at corresponding positions.

The small steel shell block 12 thus transferred to the large assembly yard 200 and placed on the mount 202 is welded to the small steel shell block 12a, the small steel shell block 12b, and the adjacent small steel shell blocks 12a and 12b sequentially. As a result, the lower floor slab shell block 11 is manufactured (second step).
On the other hand, the small steel shell block 22 of the upper floor slab 20, the small steel shell block 32 of the side wall 30, the small steel shell block 42 of the intermediate wall 40 and the small steel shell block 52 of the partition wall 50 are not shown, but the wire of the Goliath crane 100. They are suspended from the bundles 102 and 104 and sequentially transferred to a middle assembly yard 300 provided beside the large assembly yard 200.

In the middle assembly yard 300, as shown in FIG. 3, the small steel shell block 22 of the upper floor slab 20, the small steel shell block 32 of the side wall 30, the small steel shell block 42 of the intermediate wall 40, and the small steel shell block 52 of the partition wall 50. Middle assembly (pre-erection) is performed (third step).
Specifically, the small steel shell blocks 22a and 22b of the upper floor slab 20 are placed upside down, for example, on a gantry (not shown in particular), and as shown in FIG. The upper and lower ends (one end) of the small steel shell block 32 of the side wall 30, the small steel shell block 42 of the intermediate wall 40, and the small steel shell block 52 of the partition wall 50 are welded and joined to the blocks 22a and 22b, respectively. 80b are manufactured.

  At this time, a plurality of suspension hooks are welded in place to the combined steel shell blocks 80a and 80b. More specifically, in the united steel shell block 80a, a plurality of suspension hooks are welded to both ends of the small steel shell block 22a in the sinking width direction and the joining positions of the small steel shell block 42 and the small steel shell block 22a on the middle wall 40, respectively. The In the combined steel shell block 80b, a plurality of suspension hooks are welded to both ends of the small steel shell block 22b in the sinking width direction. These hanging hooks are removed as appropriate after use.

Further, in the united steel shell blocks 80a and 80b, the portions that interfere with the wire bundles 102 and 104 of the Goliath crane 100 at the time of reversing to be described later, specifically, the lower ends (the other ends) of the small steel shell blocks 52 of the partition wall 50. Reinforcing jigs 81a and 81b are temporarily installed.
The combined steel shell blocks 80a and 80b assembled in this way are hung by the wire bundles 102 and 104, respectively, with the wire bundles 102 and 104 of the Goliath crane 100 hung on the plurality of suspension hooks provided as described above. Sequentially transferred to the large assembly yard 200, inverted, and placed on the lower floor steel shell block 11 (fourth step).

3 to 6 show a procedure for reversing the united steel shell block 80a. Hereinafter, the procedure for reversing the united steel shell block 80a will be described.
As shown in FIG. 3, the united steel shell block 80a was initially provided at one end of the small steel shell block 22a in the sinking width direction, that is, at the end of the small steel shell block 22a on the small steel shell block 32 side. The wire bundle 102 is hung on the hanging hook, and the wire bundle 104 is hung on the hanging hook at the joining position of the small steel shell block 42 and the small steel shell block 22a and transferred to the large assembly yard 200.

In the united steel shell block 80a transferred to the large assembly yard 200, first, the wire bundle 104 is sent out as shown in FIG. That is, the united steel shell block 80a is suspended only by the wire bundle 102. In this state, the wire bundle 104 is once removed from the combined steel shell block 80a.
In this way, the united steel shell block 80a is suspended only by the wire bundle 102, and once the wire bundle 104 is removed, the rotary joint 106 is rotated as indicated by the arrow in FIG. The combined steel shell block 80a is turned 180 ° as shown in FIG.

  In this state, the wire bundle 104 is now hung on the other end of the small steel shell block 22a at both ends in the subsidence width direction, that is, on the end of the inner wall 40 on the small steel shell block 42 side, Rolled up. As a result, the united steel shell block 80 a that is upside down is inverted as shown in FIG. 6 to have the original correct posture, and is placed at the corresponding position of the lower floor slab shell block 11.

Here, the coalesced steel shell block 80 a has been described as an example, but the coalesced steel shell block 80 b is similarly reversed and placed at a corresponding position on the lower floor steel shell block 11.
When the combined steel shell blocks 80a and 80b are placed on the lower floor slab shell block 11, the lower ends (the other ends) of the small steel shell block 32, the small steel shell block 42, and the small steel shell block 52 of the combined steel shell block 80a. ) Are welded and joined, and the united steel shell block 80a and the united steel shell block 80b and the adjacent united steel shell blocks 80a and 80b are welded together. That is, in the large assembly yard 200, the submerged box steel shell 1 is assembled in a large size so that the lower floor slab shell block 11 and the assembled steel shell blocks 80a and 80b assembled in the middle are welded.

By the way, since the large assembly of the submerged box steel shell 1 is performed in the large assembly yard 200 and the middle assembly of the united steel shell blocks 80a and 80b is performed in the middle assembly yard 300, It is independent of the middle assembly of the combined steel shell blocks 80a and 80b, and it is possible to work in parallel with each other.
Accordingly, here, the large assembly of the submerged box steel shell 1 in the large assembly yard 200 and the middle assembly in the middle assembly yard 300 of the combined steel shell blocks 80a and 80b are performed in parallel.

  In this way, all the unionized steel shell blocks 80a and 80b are welded and joined to the lower floor slab shell block 11, and the unionized steel shell block 80a and the unionized steel shell block 80b and the adjacent unionized steel shell blocks 80a and 80b are mutually connected. When all of them are welded together, as shown in FIG. 7, the end steel shell block 61 is suspended and transferred by the wire bundles 102 and 104 of the Goliath crane 100, and is attached to both ends of the lower floor slab shell block 11 and both ends thereof. The united steel shell blocks 80a and 80b are welded and joined. Thereby, the submerged box steel shell 1 is completed.

Then, as shown in FIG. 8, finally, the bulkhead 70 is suspended and transferred by the hoist 108 of the Goliath crane 100 and temporarily installed so as to close the opening of the end steel shell block 61.
As described above, according to the method for manufacturing a submerged box according to the present invention, the small steel shell block 32 of the side wall 30 corresponding to the upper surface of each small steel shell block 22a, 22b of the upper floor slab 20 placed upside down, A plurality of united steel shell blocks 80a and 80b are manufactured by welding and joining the upper ends (one ends) of the small steel shell block 42 of the inner wall 40 and the small steel shell block 52 of the partition wall 50 (third step). The combined steel shell blocks 80a and 80b are inverted and placed at the corresponding positions on the upper surface of the lower floor slab shell block 11, and the small steel shell block 32 and the small steel shell block of the combined steel shell blocks 80a and 80b are placed. 42 and the small steel shell block 52 are welded and joined to the upper surface of the lower floor slab shell block 11 and the combined steel shell block 80a and the combined steel shell block 80b are joined together. Shell block 80a, so that fabricating 沈埋 box making steel shell 1 by welding and 80b to each other (Fourth step).

Accordingly, the small steel shell blocks 22 a and 22 b of the upper floor slab 20 are welded to the respective upper ends (one end) of the small steel shell block 32 of the side wall 30, the small steel shell block 42 of the intermediate wall 40, and the small steel shell block 52 of the partition wall 50. The work can be performed in a low place in the middle assembly yard 300, and the high place work in the large assembly yard 200 can be prevented, and the welding work can be basically a downward work.
As a result, it is not necessary to install a high platform scaffolding in the large assembly yard 200 when manufacturing the submerged box steel shell 1, so there is no need for unstable work at the high platform scaffolding, and high safety and high work efficiency. Can be secured, and a stable welding work posture can be secured to ensure sufficient welding quality.

  Further, in the middle assembly yard 300, the welding of the small steel shell blocks 22 a and 22 b of the upper floor slab 20, the small steel shell block 32 of the side wall 30, the small steel shell block 42 of the middle wall 40, and the small steel shell block 52 of the partition wall 50. That is, the middle assembly (third process) of the combined steel shell blocks 80a and 80b and the lower ends of the small steel shell block 32, the small steel shell block 42 and the small steel shell block 52 of the combined steel shell block 80a in the large assembly yard 200 ( Welding of the other end) to the lower floor slab shell block 11 and welding of the coalesced steel shell block 80a and the coalesced steel shell block 80b and the adjacent coalesced steel shell blocks 80a and 80b, that is, the submerged box steel shell 1 Since large assembly (fourth process) is performed in parallel, large assembly work in the large assembly yard 200 and intermediate assembly work in the intermediate assembly yard 300 can be performed simultaneously. , Further aims to improve work efficiency, it is possible to shorten the manufacturing time of 沈埋 box making steel shell 1.

  Further, the small steel shell blocks 12a, 12b, 22a, 22b, 32, 42 and 52 and the combined steel shell blocks 80a and 80b of the lower floor slab 10, the upper floor slab 20, the middle wall 40 and the partition wall 50 are combined with Goliath cranes (gantry cranes). ) 100 is used to transfer steel shell blocks that are relatively heavier than jib cranes. Each of these small steel shell blocks 12a, 12b, 22a, 22b, 32, 42, and 52 and the combined steel shell block 80a can be transferred. , 80b can be divided into relatively large blocks. As a result, welding operations in large assembly and intermediate assembly can be reduced as much as possible. On the other hand, in the production of each small steel shell block 12a, 12b, 22a, 22b, 32, 42 and 52, automatic plate joint welding in the factory is performed. (Submerged arc welding, etc.) can be used frequently, variation in welding quality can be reduced, higher welding quality can be ensured, and dimensional accuracy of the submerged box steel shell 1 can be improved. Furthermore, the number of transfers of the small steel shell blocks 12a, 12b, 22a, 22b, 32, 42 and 52 and the combined steel shell blocks 80a, 80b can be reduced, and the working efficiency can be improved.

Moreover, by using the Goliath crane 100, the top and bottom of the united steel shell blocks 80a and 80b can be easily reversed, and the work efficiency can be further improved.
Although the description of the embodiment according to the present invention is finished above, the embodiment is not limited to the above, and various modifications can be made without departing from the spirit of the invention.
For example, in the above embodiment, the lower floor slab 10 and the upper floor slab 20 are divided into 10 parts, respectively, and the small steel shell blocks 12a and 22a and the small steel shell blocks 12b and 22b having different sizes are combined into a combined steel shell block 80a. 80b, but the block ratio of the small steel shell blocks 12a, 12b, 22a, 22b, 32, 42 and 52 may be further increased as the capacity of the Goliath crane 100 is improved. What is necessary is just to set suitably about the shape of each steel shell block to perform according to the whole structure of the submerged box steel shell 1. FIG.

  In the above embodiment, the middle assembly of the combined steel shell blocks 80a and 80b and the large assembly of the submerged box shell 1 are performed in parallel. The third step) may be further performed in parallel with the production of the lower floor slab shell block 11 (second step), whereby the production period of the submerged box steel shell 1 can be further shortened.

It is a whole block diagram which decomposes | disassembles and shows the submerged box steel shell applied to the manufacturing method of the submerged box concerning this invention. It is a figure which shows the assembly condition of the lower floor slab shell block. It is a figure which shows the assembly | attachment condition and transfer condition of the united steel shell block in the upside down position. It is a figure which shows the inversion state of a united steel shell block. It is a figure which shows the inversion state of the union steel shell block following FIG. It is a figure which shows the transfer condition of the reverse united steel shell block, and the large assembly situation of a submerged box steel shell. It is a figure which shows the assembly | attachment condition of an edge part steel shell block. It is a figure which shows the assembly | attachment condition of a bulkhead.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submerged box steel shell 10 Lower floor plate 11 Lower floor plate steel shell block 12a, 12b Small steel shell block 20 Upper floor plate 22a, 22b Small steel shell block 30 Side wall 32 Small steel shell block 40 Medium wall 42 Small steel shell block 50 Bulkhead 52 Small steel shell block 60 End 70 Bulkhead 80a, 80b Combined steel shell block 100 Goliath crane (gantry crane)
102, 104 Wire bundle 200 Large assembly yard 300 Middle assembly yard

Claims (3)

A method of manufacturing a submerged box formed by combining a shell steel plate and a web steel plate to form a steel shell,
A first step in which the lower floor slab, upper floor slab, side wall and intermediate wall constituting the submerged box are further divided to produce a plurality of small steel shell blocks respectively;
A second step in which a plurality of small steel shell blocks of the lower floor slab are joined together to produce a lower floor slab shell block;
A plurality of small steel shell blocks of the upper floor slab are placed upside down, and the small steel shell blocks of the side walls and the small steel shells of the intermediate wall respectively corresponding to the upper surfaces of the small steel shell blocks of the upper floor slab placed upside down. A third step of joining each end of the block to produce a plurality of united steel shell blocks;
The plurality of coalesced steel shell blocks are inverted and placed at corresponding positions on the upper surface of the lower floor slab shell block, and the small steel shell block and the intermediate wall of the side walls of the plurality of coalesced steel shell blocks And joining each other end of the small steel shell block to the upper surface of the lower floor steel shell block and joining adjacent coal shell blocks together to produce a steel shell of the entire submerged box,
A method of manufacturing a submerged box characterized by comprising:   Production of the combined steel shell block in at least the third step and the lower floor slab at each other end of the small steel shell block on the side wall and the small steel shell block on the intermediate wall in the fourth step The method for manufacturing a submerged box according to claim 1, wherein the joining to the upper surface of the steel shell block and the joining of the adjacent united steel shell blocks are performed in parallel.   Using a gantry crane, in the fourth step, the united steel shell block is suspended by a plurality of wires of the gantry crane, and in the suspended state, a part of the plurality of wires is exchanged and inverted, 3. The method for manufacturing a submerged box according to claim 1, wherein the lower shell plate shell block is transferred to and placed at a corresponding position on the upper surface.

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