JPS61290198A - Method of filling back-filling material in mtehod of preceding sheet pile construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is used to construct a precast concrete structure underground using an excavator with a movable sheet pile. This relates to a method of filling materials.

``Conventional technology'' As a method of constructing various underground structures such as tunnels, underground passages, and water and sewage systems, this technology replaces the conventional cast-in-place construction method.
, a construction method using prefabricated concrete segments is known.

In such a construction method, the target underground structure is constructed by assembling the segments in a shield excavator and sequentially connecting them in the axial direction.
Due to the structure of the excavator, a gap is created between the constructed structure and the ground wall surface, so it is necessary to fill this gap with backing material such as earth and sand or mortar.

[Problem to be Solved by the Invention J] However, in the conventional method of filling backfill material in this type of construction method, the segments are connected for one ring, and then the excavator is used to connect the segments for one ring in the axial direction. Since the method uses a method of filling the void with backfilling material after moving the excavator forward by an amount equivalent to Because the amount of advance is one ring at a time, there have been problems such as uneven filling of the backing material and failure to compact it sufficiently.

``Means for Solving the Problems'' In the present invention, segments are assembled in a box-type excavator equipped with a plurality of movable sheet piles that are slidable in the excavation direction on both sides and the top and bottom surfaces, and are connected in the axial direction to form an underground structure. In the advance sheet pile construction method for constructing an object, the excavator is provided with a holding plate that closes a gap between the inner surface of the excavator and the outer surface of the structure from the inside, and this holding plate is reciprocated in the axial direction of the structure. Each time a part of each of the movable sheet piles is slid in the direction of excavation, the backing material is filled into the rear gap formed thereby, and the retainer is used. This is a construction method that compacts the backfill material.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

In the figure, the symbol l indicates an excavator suitable for use in carrying out the construction method of the present invention.

This excavator 1 is basically a known S
A construction method
It has the same function as the excavator used in The lower surface is provided with a plurality of movable sheet piles 2, which also serve as outer surface members of the excavator main body 1a. and,
These movable sheet piles 2 are configured to be slidable independently or simultaneously in the excavation direction of the excavator I by a jacking device or the like (not shown). Also, an excavator! Inside,
From the center to the rear, for example, a rectangular tubular segment (box culvert) C divided into two as shown in the figure.
A work space A is provided which is necessary for constructing the underground structure K by assembling and connecting them in the axial direction.

In the excavator l according to this example, the excavator l
A holding plate 3 that closes the gap α between the inner surface of the structure and the outer surface of the structure from the inside, and a jack 4 for reciprocating the holding plate 3 in the axial direction of the structure are provided. . The holding plate 3 has an inverted U-shape corresponding to the gap α from the top to both sides of the gap α formed around the segment C assembled in the work space A, as shown in FIG. In the illustrated example, there are three dividing plates 3a...
・It is composed of. And these dividing plates 3a
A jack 4 is provided for each. Further, each of the divided plates 3a is provided with a flexible edging member 3h such as a rubber plate on its peripheral edge.

An example of a method for filling the backfill material when constructing the underground structure using the excavator having the above configuration will be described below.

First, in order to make the excavator 1 excavate, each movable sheet pile 2 is press-fitted into the front ground in stages and secured, the internal earth and sand is excavated and discharged to the rear, and then the main body part 1a is Repeat the action of moving forward. and,
When the main body portion 1a is in the forward position, the segments C are assembled in the working space A of the excavator 1 and connected sequentially in the axial direction to construct the underground structure K.

In such a process, when a part of each movable sheet pile 2 is press-fitted into the ground as shown in FIG. 2, the movable sheet pile 2
Since a gap β is formed behind the rear gap β, at this time, the backfill material G such as sand is filled into this rear gap β portion, and then the jack 4 is operated and the backfill material G is pressed backward by the pressing plate 3. and tighten thoroughly. At this time, in order to prevent the backfilling material G from collapsing, it is desirable to maintain the pressing plate (a part of the divided plate 3a) corresponding to the portion where the sheet pile 2 is not advanced in a pressed state.

According to such a backfilling method, each time a part of each of the movable sheet piles 2 is slid in the excavation direction, the surface pressing plate 3 is filled with the backfilling material into the rear gap formed thereby. Since it is possible to use a method of compacting the filled backfilling material by using the backfilling material, it is possible to compact the backfilling material sufficiently strongly without any gaps. This point can be implemented particularly efficiently by dividing the holding plate 3 into a plurality of pieces as in the embodiment. Further, by appropriately adjusting the pressing force of each divided plate 3a by jacking, it is also possible to adjust the direction in which the excavator I excavates.

"Effects of the Invention" As explained above, in the present invention, segments are assembled and connected in the axial direction in a box-type excavator equipped with a plurality of movable sheet piles that are slidable in the excavation direction on both sides and the top and bottom surfaces. In the advanced sheet pile construction method for constructing an underground structure, the excavator is equipped with a holding plate that closes the gap between the inner surface of the excavator and the outer surface of the structure from the inside, and the holding plate is attached to the axis of the structure. A jack is provided for reciprocating the movable sheet pile in the excavation direction, and each time a part of each movable sheet pile is slid in the excavation direction, the backing material is filled into the rear gap formed thereby, and the holding plate is Since this construction method utilizes the method of compacting the backfilling material, it is possible to fill the backfilling material in stages, thereby preventing collapse of the ground wall, and at the same time ensuring that the backfilling material is tightened sufficiently. It can be solidified, which is an excellent effect not found in conventional construction methods.

[Brief explanation of the drawing]

The figures are shown for detailed explanation of the present invention.
The figure is a schematic side view, Figure 2 is a schematic side sectional view, and Figure 3 is a schematic side view.
FIG. 4 is a cross-sectional view taken along the line ■--■ in FIG. 2, and FIG. 5 is a front view of the holding plate. l...excavator, la...main body, 2...movable sheet pile,
3... Holding plate, 3a... Dividing plate, 3b... Edging member, 4... Jacket. A...Work space, C...
Segment, G... Backfill material, K... Underground structure.

Claims (1)

[Claims] In the advance sheet pile construction method in which an underground structure is constructed while assembling segments and connecting them in the axial direction in a box-type excavator that is equipped with a plurality of movable sheet piles that are slidable in the excavation direction on both sides and the top and bottom surfaces, the excavator includes: A holding plate for closing the gap between the inner surface of the excavator and the outer surface of the structure from the inside and a jack for reciprocating the holding plate in the axial direction of the structure are provided, and each of the movable sheet piles Each time a part of the is slid in the excavation direction, the rear gap formed thereby is filled with backfill material and the backfill material is compacted using the pressing plate. Filling method with backfill material in sheet pile construction method.