JPS60119804A - Construction of off-shore structure - Google Patents

Abstract

PURPOSE:To make easier the assurance of scaffold as well as shorten the period of construction by a method in which a movable truss bridge is set between a stage with legs and an artificial ground, and an overhead crane is operated to install blocks in pile groups below the movable truss bridge. CONSTITUTION:Steel tubular piles 1 are driven into the ground 7 by a vibro- hammer 6 attached to the tip of a crane 5. A stage 4 with legs is fixed with a given spacing by legs 8 in such a way as to cover the top ends of the piles 1. An assembled block 10 is installed on the pile group 3 driven by the crane on the ground's surface to construct an artificial ground 12, and a path 13 is formed on the ground 12. A movable truss bridge 14 is set between the path 13 and the stage 14 with legs. Piling work and block installing work can thus be proceeded concurrently and the period of construction can be shortened without affected by weather on water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a floating structure such as a pier.

Conventionally, as a robust and easy way to construct floating structures of various sizes, steel pipes are used as piles, and multiple steel pipes are piled at a predetermined distance from each other from the mountain to the wood of a lake, sea, etc. A construction method has been proposed in which a plurality of blocks are installed by interconnecting these steel pipes, thereby forming an artificial ground above water.

In this construction method, piles are driven in areas far from the ridge by hoisting the piles with a crane ship and driving the piles in with a pile driving ship. If the damage is higher than the block damage height, dredging is carried out using a dredger. In addition, the damage to the blocks that make up the 2nd ground was also reduced by using a large crane ship, and the scaffolding for the workers who operated the guide ropes to stabilize the suspended blocks and guide them to the installation area was This is done using a temporary pier built near the piles.

In this way, in the conventional construction method, a large number of work vessels such as crane ships and piling boats are used for pile driving, dredging, block inspection, etc. However, the cost of using a work boat is high, so the cost is high, and the construction speed is slow. In addition, since a simple pier must be provided as temporary scaffolding, the cost of scaffolding is not prohibitive. Therefore, a possible method is to weld a trestle to the front end portion of the wooden part of a plurality of piles driven one after another toward the water 1- (hereinafter referred to as a group of driven piles), and use this trestle as a scaffold.

However, in this MRI construction method, the tops of the piles are located near the water surface, so if the weather is bad and there are waves, welding of the gantry cannot be carried out, and it is difficult to install the gantry due to the waves. We have to wait until the situation calms down, and there is a risk of delaying the J゛ period, making it difficult to adopt.

This invention was made in view of the above circumstances, and its purpose is water. The purpose of this method is to provide a construction method that allows a gantry to be easily installed at the front end of a group of driven piles without being affected by the weather by attaching a plurality of legs that can be fitted to the tops of piles to the gantry. A crane for piling was placed on the trestle platform, and the crane continued to drive pilings.
This foot support and the base end of the pile group (the part near the land)
A movable truss bridge was constructed between the gantry of artificial ground 1-, which was formed by the block erection, and an overhead crane was installed on this 1-1-, and this overhead crane was used to collect the blocks. It is something.

The present invention will be explained below with reference to the drawings. Initial pile driving, that is, piling at the water's edge, can be done using a crane on land, but subsequent pile driving is shown in Figure 1. -Transport and drive pile group 3
The front end part 3a of the front end part 3a is hoisted by a crawler crane 5 mounted on a pedestal 4 provided at 3a, and then fixed with a kite member (to be described later) and attached to the tip of the crane 5. to be poured.

1-Leg I 1 The gantry 4 has I attached to the pile 1 so as to cover the top end 1a of the pile 1 on its surface, as shown in FIGS. 2(a) and 2(b).
The top-shaped legs 8, which can be attached, are fixed at a predetermined interval (pile driving interval and turning interval),
As shown in FIG. 2(b), it has a unit structure that can be disassembled and assembled span by span. Therefore, in the gantry 4 described in , when one row of piles are driven forward, one span of the land side (hereinafter referred to as gantry unit) 4a is removed and connected by fitting it to the piles 1-...1- that have been driven completely. Then, the gantry 4 can be moved forward in response to pile driving. Also,
This gantry 4 is provided with the legs 8 as described above, and is constructed so that it can be disassembled and assembled span by span, so it can be easily erected and removed on the water.

A kite member 9 is fixed to the front end of the gantry 4, and a stake is attached to the front end frame portion 9a of the guide member 9.
By inserting the , it is possible to set the distance in the front, back, left, and right when driving stakes to a predetermined value.

-l: A land crane will be used to remove one block of piles 3 near the water's edge. In addition, in order to install these grouping flocks 10...0, a receiving block 11... is fixed to the lowest part of each pile 1... in advance. The above-mentioned construction block 10 has stakes l at both ends in the direction of the pitcher.
A through hole 10a is formed through which the six stakes 1 are inserted, and the six stakes 1 are fitted onto the stakes l at mutually different positions in the vertical and horizontal directions so as to connect the six stakes 1 to each other. After the installation of the assembly blocks 1O... is completed in this way, mortar is injected into the gap between the assembly professional blocks 1O... and the piles 1 to integrate the blocks and the piles 1... The artificial ground 12 is constructed by using the artificial ground 12.

1. After constructing the artificial nail 51 t 2 near the water's edge as described above, the installation of the blocks is carried out as follows. First of all,” - Reporter JI! ! A passage 13 is formed at -1- of the board 12, and a movable truss bridge 14 is constructed between this passage 13 and the landing gear platform 4. Then, an overhead crane 15 is placed on the movable truss bridge 14, and the overhead crane 15 is used to collect damages on blocks such as the receiving block 11 and the assembling block IO. In addition, before this, if the height of the receiving block 11 to which the underwater ground 7 is to be fixed to the lowest part of the pile l is higher than the height, the steel sheet pile 16 is ... was poured,
1- Dredging is carried out by suspending the dredging pipe 17 by the crane 15. In addition, if dredging is unnecessary, the overhead crane 15 that was hanging the dredged pipe 17 will be moved to the block. "I might be killed":
Since the mobile truss bridge 14-1x can be moved freely, 1-
Dredging and block erection can be carried out quickly and efficiently.

As described in -1-, piles are efficiently driven at the front end portion 3a of the driven pile group 3 by the crawler crane 5 on the leg/J gantry 4, and at the same time, the movable truss bridge 1
4 and the overhead crane 15, blocks can be quickly installed and the artificial ground 12 can be continuously extended. The forward movement of the landing gear platform 4 at this time is - As mentioned above,
The moving truss bridge 14 is moved forward by removing the land side gantry unit 4a and reassembling it on the front end side.A hydraulic jack is installed on the passage 13 near the land side leg of the moving truss bridge 14, and the moving truss bridge 14 is moved forward. This is done using a hydraulic jack. In addition, the transportation of blocks is shown in FIG. 1, t, J:
This can be done quickly by using the trailer 18 that travels along the passage 13J.

In addition, in the above configuration, when the structure is a pier,
=It is completed when the passageway 13 is installed.

Further, in the above embodiment, the leg part 8 of the leg rest 4 is configured in a cap shape, but as shown in the leg rest 19 shown in FIG. It may be configured to have a pointed shape so as to fit into it.

With this configuration, the gantry can be attached to the pile l even if the pile l that has been driven is slightly inclined and the head of the pile is out of position. can be stored in a predetermined position by the leg portions 18.

Furthermore, in Example h, the gantry 4 has 4 spans (Fig. 1) or 5 spans (Fig. 2) for driving the steel sheet piles 16, but when driving the steel sheet piles is not necessary, it has 3 spans. A gantry is sufficient.

As explained above, according to the method of constructing a water-1 structure of the present invention, a landing gear platform, a crawler crane, and a moving!
F11) By adopting a lath bridge and an Otsuki crane, the structure is configured so that piling work and block installation work can proceed at the same time, so the first stage can be completed without being affected by weather. It is economical because it is short and can be done without using a work boat, which has high transportation and operating costs. This is especially advantageous when constructing floating structures in remote areas or overseas where work vessels must be sailed around.

[Brief explanation of the drawing]

Figure 1 is for explaining the method for constructing a floating structure according to the present invention, and Figures 2 (a) and 2 (b) are an overall view of the structure being constructed by this method. (a) is a partially cutaway plan view, (b) is a side view, and Figures 3 (a) and 3 (b) show other structures of the gantry. a) is a side view before it is fitted on the pile, and (b) is a side view after it is fitted on the pile. l... Φ pile, l aa building/top, 2... barge, 4.
19◆・Fist leg support structure, 51・Crawler crane, 8.2
0... Legs of IJ gantry, lo... Assembly block, 10a... Through hole, 11... Receiving block, 12...
...Artificial ground, 14.. Mobile truss bridge, 15.. Fist overhead crane.

Claims (1)

[Scope of Claims] A plurality of stakes are driven into the ground below the water surface from the floor toward the lake, Vli, etc. at predetermined intervals, and Professional with multiple holes,
The blocks were installed from a predetermined position below the water surface to the water surface by interconnecting the plurality of piles, and 71 professionals poured mortar into the gaps between the blocks and the piles. to form an artificial ground,
In this method of constructing structures such as passages and buildings on artificial ground, a base with legs having a plurality of parts that can be fitted onto the top of the pile is driven for one pile. It is installed by fitting the legs to the tops of the plurality of piles at the front end, and a crane is placed on top of this platform, and the crane is used to lift the piles on the barge and place them on the wood side. At the same time, a moving truss bridge is constructed between the shouting platform and the ground, and an overhead crane is mounted on the moving truss bridge.
This overhead crane is configured to install the blocks on the pilings under the movable truss bridge, and while the above-mentioned gantry and movable truss bridge are sequentially moved from the ridge toward the wood, the man-V ground is continuously moved. A method of constructing a floating structure characterized by the following steps: