JPS6340024A - Pile-type caisson work - Google Patents

Abstract

PURPOSE:To quickly install a caisson without the needs for forming base ground by a method in which a double-wall caisson is softly landed, and piles driven under the guidance of the double wall and the caisson are rigidly connected by concrete. CONSTITUTION:The surrounding wall 2 is made up of double walls 2a and 2b in a dry dock, etc., and the double walls 2a and 2b are connected by concrete wall vertically on several adequate sites to construct a caisson 1. The caisson 1 is towed to a desired site and softly landed on soft ground 3, and piles 5 are driven into the ground to the bearing ground 6 under the guidance of the double walls 2a and 2b. After the driving of the piles 5 is completed over the whole surrounding, concrete 7 is placed into the space between the double walls 2a and 2b to integrate the piles 5 with the caisson 1 by rigid-connection. The cost and period of the construction work can thus be curtailed and the workability can also be raised.

Description

[Detailed description of the invention] [Industrial application field] Piles that enable rapid construction of outer facilities such as breakwaters, quay walls, seawalls, sea walls, off-shore breakwaters, yachts, etc. using the caisson construction method. This is an invention related to the two-way caisson method.

[Conventional technology]

In the conventional caisson construction method, a foundation with a certain strength was built underwater to provide wave protection through the stability of a rigid body, and a caisson etc. was installed on top of the foundation.

For this reason, in areas where sludge and other deposits have accumulated, it is necessary to replace the soft seabed layer or create a foundation using soil improvement methods, which has the disadvantage of having many restrictions in terms of construction efficiency, construction period, construction cost, etc. This is what I had.

[Problem that the invention seeks to solve]

This is an attempt to solve the problem of having to replace the soft seabed layer or improve the ground in areas where sludge and other deposits have accumulated when installing caissons.

[Means for solving problems]

A caisson with a double circumferential wall was towed into the soft ground in a dry dock, and piles were driven to the supporting ground using the double wall of the caisson's circumferential wall as a guide. After that, by pouring concrete into the double wall and rigidly connecting the piles and caisson, it is possible to install the caisson without having to take any measures such as replacing the soft ground or creating a foundation using soil improvement methods prior to the installation of the caisson. This problem was solved by making it possible to install it.

[For production]

Inside a dry dock or floating dock, the lower bottom of the double-walled caisson is closed off with an iron plate, etc., and the caisson is floated on the water.The caisson is towed to the destination and the soft ground is secured using a known method. Concrete down to the ground. The steel plate at the bottom of the double wall will be removed prior to driving the piles. In order to keep the caisson in a state of soft landing, seawater is injected around the caisson to make it sink, or a float is installed around the caisson to make it float.

When the driving of the piles around the caisson is completed, concrete is placed inside the double wall to rigidly connect the piles and the caisson. After installing the caisson, the superstructure will be poured. After pouring the superstructure, if a float is attached, remove the float and complete the construction.

[Example] In order to open the bottom of a dry dock or floating dock, concrete walls are connected vertically at several appropriate locations, and when towing the bottom of the double wall is closed with a thin plate such as a steel plate to prevent seawater from leaking out. Avoid entering.

The caisson (1) is towed to the destination and the soft ground (3) is
Apply soft land ink on top. In order to drive piles into soft ground with a soft land incline, inject seawater or drive floats (4) up to the support ground (6) as necessary, and then drive all the piles (5) on the surrounding wall of the caisson (1). When the pouring is completed, concrete (7) is poured between the double walls (2a) and (2b) to rigidly connect the pile (5) and the caisson (1). After installing the caisson, the superstructure (8) is poured, and if there is a float (4), the float (4) is removed.

To prevent water from entering the bottom of the double walls (2a) and (2b) when driving the piles (5), a thin iron plate is fastened to the caisson (1) with something like a band, making it easy to install. Since it can be removed, there is no problem in driving the pile (5).

〔Effect of the invention〕

This construction method enables rapid construction by carrying out the construction as described above, and while the span of a typical caisson is 10 to 15 m, this construction method allows spans of IOOm, and furthermore, does not require improvement of soft ground. It has characteristics such as being economical.

[Brief explanation of the drawing]

The figure is a sectional view during construction of the present application.

Claims (1)

[Claims] (1) Inside a dry dock or floating dock, a caisson with double peripheral walls is towed into soft ground, and piles are driven to the supporting ground using the double walls of the caisson as a guide. , a pile-type caisson construction method characterized by pouring concrete into a double wall and rigidly connecting the piles and caisson.