JPH06280480A - Joining method for steel shell box body - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a method for connecting steel shell boxes that does not require the construction of a large-scale structure on a large dock. [Structure] One steel shell box to be joined has a hook 21 and a key 27 for locking in the opening 16, and the other steel shell box to be joined is the aforementioned one for locking in the opening. A hook 17 that meshes with the hook and a hole 13 into which the key can be fitted,
The two steel shell boxes are towed, one steel shell box is lifted up and down, the hooks and keys of the two steel shell boxes are engaged, and in this state, the two steel shell boxes are attached in a direction to separate them. A method of connecting steel shell boxes by urging, placing concrete at the bottom of both steel shell boxes, and releasing the urging force to the steel shell boxes after hardening the concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for constructing large underwater structures such as submerged tunnels and large-scale concrete boxes, and more particularly to a method for connecting steel shell boxes.

[0002]

2. Description of the Related Art At present, a steel shell concrete structure is often used as a structural form for constructing a submerged tunnel or a large-scale concrete box. The steel shell concrete structure is a structure in which the outside of a normal concrete structure is surrounded by a steel plate, and the steel plate can be used as a formwork, and has advantages such as excellent waterproofness. In addition, recently, the transmission mechanism of shear stress between concrete and steel plate has been clarified, and structural strength can be expected. Conventionally, the construction of a large-scale concrete box or the like using such a steel shell concrete structure has been generally performed in a dry dock.

[0003]

[Problems to be Solved by the Invention] In recent years, especially in the suburbs of cities, there is a marked shortage of docks for constructing large-scale concrete boxes. For this reason, the construction plan for structures depends heavily on the availability of docks.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to connect steel shell boxes that do not require the construction of a large-scale structure in a large dock. To provide a method.

[0005]

According to the present invention, one steel shell box to be joined has a hook and a key for locking at the opening, and the other steel shell box to be joined is The opening has a hook that engages with the hook for locking and a hole into which the key can be fitted, and the two steel shell boxes are towed to lift or sink one steel shell box to remove the steel. Engage the hook and key of the shell box,
In this state, it is urged in the direction separating the two steel shell boxes,
This is a method for connecting steel shell boxes in which concrete is placed at the bottom of both steel shell boxes and the biasing force against the steel shell boxes is released after the concrete hardens.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the steel shell box according to the present invention will be described below with reference to the drawings. <a> Structure of steel shell box (Fig. 1) As shown in Fig. 1, the steel shell boxes 1 and 2 are divided into a plurality of members constituting the outer shell of the underwater structure to be constructed. is there.

<B> Insert-side steel shell box (FIGS. 1 and 2) The insert-side steel shell box 1 has, for example, a rectangular cross section, and the inside thereof is partitioned by a removable partition wall to form a ballast chamber 12. It is formed so that floating and sinking of the insertion-side steel casing 1 can be controlled by pouring and draining the ballast chamber 12. The bottom of the opening 16 of the insertion-side steel shell box 1 extends to form an extension 17, and the downward hook 11 is formed at the end of the extension 17.
Are integrally formed. The extension 17 has a plurality of vertical key holes 13 penetrating vertically in a position avoiding the downward hook 11. The vertical key hole 13 is a hole for inserting a vertical key 26, which will be described later, and its inner diameter is slightly larger than the outer diameter of the vertical key 26 so that manufacturing errors such as the downward hook 11 can be absorbed. As shown in the enlarged portion of FIG. 2, a water blocking material 113 made of rubber or the like is attached to the lower surface of the convex portion 112. As shown in FIG. 1, a horizontal key 14 is projectingly provided above the both side portions 19 of the insertion-side steel shell box 1.

<C> Receiving Side Steel Shell Box (FIGS. 1 and 2) Like the inserting side steel shell box 1, the receiving side steel shell box 2 has a ballast chamber 22 for controlling the ups and downs formed therein. There is. The front surface of the receiving-side steel shell box 2 is open, and a connection chamber 24 is formed in the front surface portion for joining with the insertion-side steel box body 1. The connection chamber 24 is a part for inserting a part of the insertion-side steel shell box 1 to connect with the insertion-side steel shell box 1. The side surface 23 of the connection chamber 24 extends in the direction of the open front surface, and the end portion is bent outward so that the insertion side steel shell box 1 can be easily inserted. A U-shaped cutout horizontal keyway 25 is formed on the extended upper side of the side surface 23. This horizontal key groove 25 is the same as the horizontal key 1 described above.
4 is a groove for inserting 4. Side surface 23 in connection chamber 24
Is provided with a jack 26 that is oriented horizontally. The downward hook 21 is formed on the lower surface of the connection chamber 24. A plurality of vertical keys 27 are provided on the upper surface of the downward hook 21 at a predetermined distance from each other. Vertical key 27
Has a tip with a reduced diameter, and is formed in a shape that can be easily inserted into the vertical key hole 13. In addition, as shown in FIG. 2, if the water blocking members 18 and 28 are provided on the facing surfaces of the hooks 11 and 27, good water blocking can be maintained. This embodiment is a case where both the steel shell boxes to be connected have a floating / sinking function, but it can also be adopted when only one of the steel shell boxes has a floating / sinking function.

<D> Hook (FIG. 2, FIG. 3, FIG. 4) The upward hook 21 and the downward hook 11 are portions for hooking the insertion side steel box body 1 and the receiving side steel shell box 2. Regarding the shapes of the upward hook 21 and the downward hook 11, as shown in FIG. 3, in addition to those shown in FIG.
It is also possible to employ one having an inner surface that comes into contact with a key shape or one formed by injecting mortar or the like into the hooks 21 and 11 as shown in FIG.

[0010]

Next, the method for connecting the steel shell boxes will be described. <a> Settling of steel shell box (FIG. 5) The insertion side steel shell box 1 and the receiving side steel shell box 2 guided to the same water surface are positioned with the downward hook 11 and the upward hook 21 facing each other. Water is poured into the ballast chamber 22 of the receiving-side steel shell box 2 so that the upper end of the vertical key 27 of the receiving-side steel shell box 2 is located below the lower end of the downward hook 11 of the insertion-side steel box 1. The receiving side steel shell box 2 is allowed to settle.

<B> Horizontal movement of steel shell box (Fig. 6) Horizontally move both the insertion side steel box 1 and the receiving side steel shell box 2 by using a tugboat so that they approach each other. . Further, this horizontal movement may be performed by using the expansion and contraction of the jack 26. That is, with the jack 26 extended, a rope or the like is fastened to the tip of the piston, the other end of the rope is fastened to the insertion-side steel casing 1, and then the piston is contracted to move the insertion-side steel casing 1. The drawing is performed by drawing the steel shell box 2 on the receiving side.

<C> Joining between steel shell boxes (FIGS. 1 and 7) The water in the ballast chamber 22 of the receiving side steel shell box 2 is drained and the ballast chamber 12 of the inserting side steel box 1 is drained. Pour water into. Therefore, the receiving side steel shell box 2 floats up, and the inserting side steel box body 1 sinks. For pouring and draining into the ballast chambers 22 and 12,
The process is performed until the downward hook 11 and the upward hook 21 are joined. The downward hook 11 and the upward hook 21 are joined together.
Even if the horizontal positions of the insertion-side steel casing 1 and the receiving-side steel shell casing 2 are slightly deviated from each other, it can be easily performed. It is because the horizontal key 14 of the insertion side steel casing 1 is the horizontal key groove 25 of the receiving side steel shell casing 2.
This is because the vertical key 27 of the receiving side steel shell box 2 is guided inside and is guided into the vertical key hole 13 of the insertion side steel box 1.
When the upward hook 21 and the downward hook 11 are joined,
The piston 261 of the jack 26 is extended and pressed against the partition wall 15. Therefore, the upward hooks 21 and the downward hooks 11 are strongly joined, and the insertion-side steel casing 1 and the receiving-side steel shell casing 2 are united. Then, the side surfaces of the insertion-side steel casing 1 and the receiving-side steel shell casing 2 are joined together by bolts or the like.

<D> Placing bottom slab concrete (FIGS. 2 and 8) All the water in the ballast chambers 12 and 22 and the connection chamber 24 is drained. As shown in the enlarged portion of FIG. 2, since the water blocking material 18 is attached to the lower surface of the downward hook 11 and the water blocking material 28 is attached to the upper surface or the side surface of the upward hook 21, the water blocking at the hook joint portion is prevented. It can be done reliably. After confirming that the waterproof property of the connecting chamber 24 is secured, the connecting chamber 24
Reinforcing bars are placed on the bottom of the. Reinforcing bars are arranged in advance on the bottom surface other than the connection chamber 24. Then, concrete 3 is placed on the bottom surfaces inside the insertion-side steel casing 1 and the receiving-side steel shell casing 2, that is, the bottom faces of the connection chamber 24, the ballast chambers 12 and 22, and the like.

<E> Shrinkage of the jack If the stretched jack 26 is shrunk after the concrete 3 is hardened, a prestressing effect can be expected for the concrete 3 in the connecting chamber 24.

[0015]

Since the present invention is as described above, the following effects can be obtained. <A> In constructing a large-scale box, by connecting a plurality of small boxes on the sea or the like, it can be performed without using a dry dock. Therefore, it is possible to make a construction plan for the structure regardless of the availability of the dry dock.

<B> By placing concrete on the bottom surface of the connected steel shell boxes, the load applied between the steel shell boxes can be sufficiently transmitted.

[Brief description of drawings]

FIG. 1 is a perspective view of a steel shell box.

FIG. 2 is a side sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of the hook

FIG. 4 is a sectional view of the hook.

FIG. 5 is an explanatory diagram of a connecting method.

FIG. 6 is an explanatory diagram of a connecting method.

FIG. 7 is an explanatory diagram of a connecting method.

FIG. 8 is an explanatory diagram of a connecting method.

Claims (1)

[Claims] 1. One steel shell box to be joined has a hook and a key for locking in an opening, and the other steel shell box to be joined is the hook for locking in an opening. Has a hook that engages with the key and a hole that allows the key to be fitted, and tows the two steel shell boxes, lifts and lowers one of the steel shell boxes, and meshes the hooks and keys of the two steel shell boxes. Then, in this state, urging in the direction separating the two steel shell boxes, placing concrete at the bottom of both steel shell boxes, and releasing the urging force to the steel shell box after hardening the concrete. , How to connect steel shell boxes.