JP2001152469A - Joint method for last submerged caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint method for the last submerged caisson capable of eliminating a cut-off panel for connecting the last caisson, reducing underwater working to the utmost, reducing the load imposed on a diver and also promoting work efficiency. SOLUTION: A cut-off rubber 12 capable of being used for a form is fixed to the circumference of a pair of submerged caissons constituting the last submerged caisson, both caissons 10 are capable of making relative displacement in the longitudinal direction according to the expansion of the cut-off rubber 12 to keep the inside thereof in an air-tight state, the caissons are set between the existing caissons being submerged and fixed, and after the end faces of both caissons are connected to the end faces of existing caissons 16, the cut-off rubber 12 is used as an outside permanent form to cast post-cast concrete 22 from the insides of the caissons, so that the circumferences of both caissons 10 are combined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint method for a final immersion box.

[0002]

2. Description of the Related Art As one of the final jointing methods for a submerged tunnel, there is a water stop panel method. This method is constructed by the procedure shown in FIG. That is, first, as shown in (a), the opposing buried boxes 1 are laid down and fixed on the sea bottom at a predetermined interval, and then, as shown in (b), the joint bottom surface, both side surfaces and upper surface of both buried boxes 1 After the waterproofing panel 2 is attached and fixed to it, a plurality of blocking members 3 are laid between the waterproof walls 1a of the submerged boxes 1 to reinforce the interior, and then the inside of the joint portion is drained to stop each waterproofing. The panel 2 is brought into close contact with the outer periphery of the joint portion, and then, as shown in (c), a formwork 4 is built inside, and concrete 5 is cast from the inside between the water stop panel 2 and the joint portion, thereby forming the joint portion. Was building.

In this construction method, each of the water stop panels 2 is suspended one by one from the sea by a crane, and is installed at a predetermined place by an adjusting operation of a diver waiting in the sea. Therefore, there is an advantage that the adaptability to the amount of deformation is higher than other construction methods such as a terminal block method, a V block method, and a key element method.

[0004]

However, in this method, the underwater work for fixing the water stop panel to the outer periphery of the submerged box occupies most of the work, it takes time to install, and the burden on the diver is large. There was a problem that work efficiency was poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to eliminate the need for a waterproof panel and to minimize the underwater work, thereby improving the work efficiency of the final immersion box. A joint method is provided.

[0006]

In order to achieve the above object, the present invention provides a final immersion box, wherein an expansion joint is provided between the two immersion boxes so as to extend over the two immersion boxes. Can be relatively moved in the longitudinal direction according to the
After the interior is kept in a watertight state, the final immersion box is set between the existing immersion boxes, and after connecting the end surface of the final immersion box to the end surface of the existing immersion box by extending the expansion joint, The expansion joint is used as an outer disposal form, and concrete is poured from the inside of the final buried box to integrate the outer periphery of the buried box. Therefore, in the joint method of the present invention, there is no underwater work for installing the formwork, the work efficiency does not decrease, and the diver's burden can be reduced as much as possible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a joining procedure of a final buried box to which the joint method according to the present invention is applied. First, in FIG. 1 (a), a waterproof rubber 12 swelling outward in the form of a diaphragm is fixed integrally in advance to the outer periphery of a joint surface of a pair of sinking boxes 10 constituting a final sinking box. Both sides partition 10a
The interior space enclosed by is sealed airtight, and buoyancy in water is secured. A guide plate 14 for positioning guide to the existing buried box 16 is fixed to both upper sides of both buried boxes 10. Further, a water injection hole 10b is opened in the upper part of both immersion boxes 10, and the water injection hole 10b can be opened and closed by a valve (or cap) 18.

An existing submerged box 16 which has been submerged and fixed is disposed opposite to the submerged box 10 having the above configuration at a predetermined interval on the sea floor. It is hung between 16. In the suspended state, as shown in (b), the guide plate 14 abuts on the top ends of both existing submerged boxes 16 to perform positioning in the height direction.

In this state, the valve 1 is operated by remote control or the like.
When 8 is opened, water pressure is applied inside, and as a result, (c)
As shown in (1), both buried boxes 10 are guided by the guide plate 14 and move left and right with the diaphragm-shaped bulging surface of the water-stopping rubber 12 extended, and both end faces abut the end faces of the existing buried box 16. The abutting portions are joined, and a water stopping process is also performed.

After the water stoppage treatment, the partition 16 on the existing
By draining the space surrounded by the partition wall 10a and the partition wall 10a of the immersion box 10, removing the partition wall 16a, closing the valve 18, and draining the water inside the burying box 10 while injecting air, FIG. As shown in (a), the inside of the immersion box 10 communicates with the existing immersion box 16 in a state in which the waterproof rubber 12 is bent inward by water pressure.

In this state, the partition 10a on the side of the buried box 10 is removed, and the waterproof rubber 12 is used as an outer disposal form as shown in (b) and (c), and the inner form 20 is opposed to this. After the concrete is hardened, the concrete is hardened and the inner form 20
Is removed, the submerged boxes 10 are joined together to complete the operation.

It is also possible to deform the waterproof rubber 12 to the outside by making the pressure of the concrete pump antagonize the water pressure, thereby making the outside of the joint part straight in accordance with the external shape of the submerged box 10. It is.

[0013]

As is apparent from the above description, the joint method of the final immersion box according to the present invention does not require a water stop panel as in the prior art, requires less underwater work, and reduces the burden on the diver. It can be reduced and work efficiency can be improved.

[Brief description of the drawings]

1 (a) to 1 (c) are sectional explanatory views showing a joint method of a final immersion box according to the present invention and an operation procedure by the same structure.

FIGS. 2 (a) to 2 (c) are cross-sectional explanatory views showing a work procedure following FIG.

FIGS. 3 (a) to 3 (c) are cross-sectional explanatory views showing the operation procedure of a conventional waterproof panel construction method.

[Explanation of symbols]

 10 Submerged box 12 Waterproof rubber 16 Existing submerged box 22 Post-cast concrete

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Katsuya Hamachi 2-15-2 Konan, Minato-ku, Tokyo F-term (reference) 2D055 EA02 EA05 GD02

Claims (1)

[Claims] An expansion joint which straddles both of the final immersion boxes is provided between the two immersion boxes, and the two immersion boxes can be relatively moved in the longitudinal direction in accordance with expansion and contraction of the expansion joint. And
After the interior is kept in a watertight state, the final immersion box is set between the existing immersion boxes, and after connecting the end surface of the final immersion box to the end face of the existing immersion box by extending the expansion joint, A joint method for a final immersion box, wherein concrete is poured from the inside of the final immersion box by using the expansion joint as an outer disposal formwork to integrate the outer periphery of the immersion box.