JPS6389727A - Construction work of sheet pile - Google Patents

Abstract

PURPOSE:To reduce the amount of mud water to be used by effectively utilizing excavated soil by a method in which steel sheet piles are driven into an excavated pit filled with mud water, excavated soil is charged into the surrounding of the piles, and overflowing mud water is reutilized. CONSTITUTION:The ground is excavated to a given depth by an excavator, mud water is injected into a casing 9, and the casing 9 is pulled out. Steel sheet piles 2 are driven into the excavated pit 1 filled with mud water, and excavated soil after removing cobble stone by the screen of a soil-charging bucket 8 is charged into the surrounding of the piles 2. Mud water which overflows when injected into a preceding casing 9 by a water pump 10. The excavated soil can thus be effectively utilized to reduce the amount of mud water to be used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a construction method for continuously constructing sheet piles in the ground.

[Prior art]

BACKGROUND ART Conventionally, a method of continuously constructing steel pipe sheet piles or steel sheet piles into the ground has been used for constructing river bank protection works, retaining walls for waterways and roads, and the like.

[Problems to be solved by this invention]

These conventional sheet pile construction methods often involve driving, which poses the problem of noise pollution, and in the method of erecting sheet piles into excavated holes, the excavator is supported. A large crawler type base machine is often required. For this reason, work efficiency was problematic at sites with narrow work spaces, and narrow roads sometimes had to be completely closed off to allow for on-road work.

Therefore, this invention improves the disadvantages of the conventional method as described above, does not require a large base machine, has good workability even in a narrow work space, is easy to dispose of excavated soil and mud, and can be used on roads. The purpose is to provide a construction method that can minimize the impact on vehicular traffic even during construction work.

[Structure of the invention]

The method of constructing sheet piles according to this invention is to arrange rails along both sides of the planned excavation location, and use the excavation mechanism and packet that run on the rails to excavate muddy water using the casing to a predetermined depth, and to excavate the mud inside the packet. Multiple excavated soil is continuously excavated to create an excavated trench filled with muddy water, and sheet piles are successively placed in this excavated trench to backfill the excavated trench with the soil in the packet, and the overflowing muddy water is submerged. It is unique in that the process of injecting into the casing, which has been previously excavated using a pump, is repeated sequentially.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to illustrated embodiments. 1st
Fig. 2 shows a plan view and an elevation view of an embodiment in which steel sheet piles are continuously constructed around a road using the construction method according to the present invention.

Here, rails 3 are arranged along both sides of the planned excavation position, and an excavator 12 and an earth and sand charging packet 8, which will be described later, can run on the rails 3.

Further, an H-shaped steel 4 is placed on the road surface, and a metro deck 5 is laid thereon so that the height is approximately equal to the height of the rail 3, thereby forming a workbench. Slides 7 are placed on the left and right sides of the workbench constructed in this manner to enable vehicular traffic.

The excavator 12 used in this construction method is shown in Fig. 6(a).
(As shown in the plan view and side view of bl, the reader 13
It is equipped with an excavation mechanism 10 and an elevating cylinder 11, moves on rails 3, buries the casing 9 at a predetermined excavation position, excavates the inside, pulls out the casing 9 after pouring mud, and moves to the next excavation position. It is something that moves.

Further, the soil charging packet 8 is shown in FIG. 7(a).

(b), (C1, (As shown in the side view, front view, bottom view, and plan view of dl, a sieve of approximately 100 m/m square is installed at the top of the opening, and a predetermined amount of water is extracted from the excavated earth and sand. It is possible to move on the rail 3 by storing earth and sand for backfilling from which boulders exceeding the value have been removed.

Here, the construction procedure will be explained with reference to the plan view and cross-sectional view of a row of excavated parts shown in FIGS. pull out the casing 9. This work, 3
Drill hole 1 filled with muddy water is created by repeating this process for about 1 or 5 times. (Step C) A spacer 2' is installed in the excavated hole 1 filled with muddy water so that the tip of the steel sheet pile 2 will not be misaligned within the excavated hole 1.

This spacer 2' has the shape shown in Figure 5 (C1), and when the steel sheet pile 2 is lifted by a crane,
It is attached as shown in b) and is set in the excavation hole 1 by its own weight while being guided by the construction ruler 6. (Step B) In this way, the earth and sand excavated after the steel sheet pile 2 is erected is backfilled around the steel sheet pile 2 by removing cobblestones with the sieve of the earth and sand charging packet 8. (Step A) At this time, the muddy water flowing through the doper is injected into the preceding casing 9 by the submersible pump 10.

〔Effect of the invention〕

The embodiment of the sheet pile construction method according to the present invention is as described above, and the following effects can be achieved.

It does not require a large base machine, and it is easy to work even in narrow work spaces (because excavated soil is stored in packets and effectively used for backfilling, and muddy water is also repeatedly injected into the preceding casing) The overall amount of muddy water used is small and it is easy to dispose of, and the impact on vehicle traffic can be kept to a minimum even when working on the road.

Further, by mixing a hardening agent such as cement into the earth and sand contained in the packet, it is possible to increase the sheet pile supporting force when backfilling an excavated trench.

[Brief explanation of the drawing]

Figures 1 and 2 are an overall plan view and an elevation view of the embodiment, Figures 3 and 4 are a partial plan view and underground sectional view of the embodiment, and Figures 5 (a) and (b). are a front view and a plan view showing the installation state of the spacer, the same figure (C1 is an enlarged view of the clip, Fig. 6 (a), (b) is a plan view and front view of the excavator, Fig. 7 fan, (b) ). (C1, (d) is a side view, a front view, a bottom view, and a plan view of the packet. 1--- Excavator, 2--- Steel sheet pile, 2'
-------・Spacer, 3-・-・-Rail, 4・
-・-H type steel, 5-1 metro deck, 6・------・
Construction ruler, 7--Sliding stand, 8-- Packet for soil injection, 9-- Casing, 10--
--- Excavation mechanism, 11 --- Lifting cylinder - 112-
・−・・Excavator, 13・−・−Leader.

Claims (1)

[Claims] A construction method in which sheet piles are continuously constructed in the ground, in which rails are arranged along both sides of the planned excavation position,
An excavator running on the rails excavates muddy water to a predetermined depth using a casing, and the excavated soil is stored in a packet running on the rails, and multiple trenches are continuously excavated to create an excavated trench filled with muddy water. and backfilling the excavated trench with earth and sand in the packet by continuously arranging sheet piles in the excavated trench,
A sheet pile construction method characterized by sequentially repeating the process of injecting overflowing muddy water into an excavated casing using a submersible pump.