JPH02236308A - Construction for water passage for bank - Google Patents

Abstract

PURPOSE:To prevent generation of voids and dislocation and to improve construction time by connecting respective can bodies placed on a construction floor for burying the cans to respective opening end faces through elastic members, flexibly tensing a PC steel passing through a thick wall and burying the can bodies. CONSTITUTION:In each can body 1, a proper number of sheath pipes 3a are buried in the direction of its long side. On an end face 1a, a recessed groove is formed and a rubber expansion rubber seal 8 is provided. Then, the can bodies 1 are continuously connected together on a burying construction floor (n) through elastic material 2 on their end faces 4. A PC steel material 3 is inserted into the sheath pipe 3a and flexibly tensed so that the elastic material 2 can fully meet rotational distortion. Accordingly, even when the ground is depressed due to consolidation, the elastic material 2 generates the rotational distortion, is bent and deformed, so that the generation of any void on the lower face of a water passage of the generation of leakage due to the dislocation of connecting part can be prevented. Since pile foundation is not required, construction can be carried out economically and in a short period.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for constructing a waterway constructed on an embankment built along a river. (Prior Art) Conventionally, a river embankment, etc. The embankment waterway, which is constructed from the river side to the outside at the bottom of the river, first excavates the embankment to form a construction bed for burying boxes that connects the river side and the outside, and then extends the entire length of the horizontal bed for burying boxes. A pile foundation is formed over the pile foundation, and an embankment waterway is integrally formed on the pile foundation using cast-in-place concrete, or by continuously connecting a number of precast concrete boxes of appropriate length. Was.

This system supports the entire embankment waterway and prevents it from sinking in the event that the ground of the embankment consolidates and settles by forming a pile foundation along the entire length of the lower surface of the embankment waterway. (Problems to be solved by the invention) However, the embankment waterway constructed by the above construction method not only takes time and effort to form a pile foundation that requires a large number of piles, but also causes consolidation settlement in the ground of the embankment. When this occurs, there is a problem in that a gap is created at the bottom of the embankment waterway.

The present invention was made in view of the above-mentioned problems, and its purpose is to prevent gaps from forming on the lower surface of the embankment waterway and to connect the boxes when consolidation settlement occurs in the ground of the embankment. To provide a method for constructing an embankment waterway which can be easily constructed without much effort and time by preventing gaps or deviations from occurring in the connecting parts of the embankment waterway formed by the above methods.

(Means for Solving the Problems) The means of the present invention for solving the above problems is to apply a construction method for an embankment waterway to an embankment built horizontally along a river, on both the river side and the outside. A connected horizontal built-up floor for box burying is excavated, a plurality of boxes having openings communicating with each other at both ends are placed directly on the horizontal built-up floor for box burying, and the boxes are placed in a circular shape between the opening side ends. The PCT! is connected continuously through the elastic body of the PCT! The purpose of the present invention is to create a structure in which the four materials are tensed to make them soft, and then the box is buried back. According to the above configuration, when consolidation subsidence occurs in the ground of the embankment, the embankment waterway freely curves and deforms in accordance with the consolidation subsidence.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a river embankment waterway A constructed by the construction method of the present invention. To construct the embankment waterway A,
First of all, a constructed bed n for box burial of an appropriate width is connected between the river side a and the outside b of the embankment m built along the river.
to excavate.

After compacting or improving the ground, a large number of boxes 1 are placed directly on the bottom surface. The box 1 is made of cast-in-place concrete and has a rectangular shape with openings 5 connected to both ends. In addition, sheathed pipes 3a for inserting prestressing steel materials are buried at appropriate intervals in the peripheral wall 1b of the box 1 along the long side direction, and the opening side end surface 1a outside the sheathed pipes 3a,
A concave groove with a concave cross section is formed in la, and a water-expandable rubber seal 8 with a sponge 8a provided in the concave groove is provided in an annular manner, and is connected to the connecting part of the embankment water passage A that is continuously formed. Prevent water leakage. Next, these boxes 1 are continuously connected to the end surface 4 on the opening side via the annular elastic body 2. This case 1 is connected by aligning the center axes of the openings 5 concentrically to form a passageway 6 over the entire length. An insertion hole 7 into which the steel material 3 is inserted is formed. still,
The box 1 is not limited to one made of cast-in-place concrete as described above, but may also be a box rubato made of precast concrete, a Hume pipe, or a steel pipe. Further, the shape of the box 1 is not limited to a rectangular shape, but may be formed into a circular shape or the like. The elastic body 2 is made of CR rubber (chloroprene rubber) with excellent elastic properties and aging stability, and is attached to the opening side end surface 1a of the box 1.
, la, and the outer and inner surfaces on the water passage 6 side are filled with polysulfide sealing materials 2a, 2a' and retaining materials 2b, 2b'. Next, P is inserted into the insertion hole 7 formed by the sheath tube 3a.
The C steel material 3 is inserted and both ends or one end thereof are tensioned using a tension jack, thereby forming a buried box path A to which a prestress is applied.

As shown in FIGS. 5 and 6, this tension is such that the elastic body 2 can cope with the rotational strain of the buried box path A caused by consolidation subsidence of the ground, that is, the elastic body 2 can crush the rotational strain S or more. It becomes soft and tense to the degree of deformation. Therefore, the buried boxway A has been crushed and deformed in advance by the tension of the prestressing steel material 3 to compensate for the rotational strain S or more caused by the compact subsidence of the ground of the elastic body 2 at the connection part, so that when the rock is consolidated and subsides, , the elastic body 2 undergoes a rotational strain by an amount S and undergoes a curved deformation. This also applies to external forces in either the downward or left-right directions, and bending deformation is also possible to the left and right. As the PC#W material 3, a single wire, a stranded wire, a steel rod, an unbonded steel material, a chemical fiber tendon material, etc. are used.

(Effects of the Invention) The present invention has the following effects by having the above configuration. ■ A built-in floor for box burying that communicates between the river side and the outside is excavated on an embankment built along a river, and multiple boxes having openings that communicate at both ends are placed directly on the constructed bed for box burying. At the same time, the case is continuously connected between the end surfaces of the opening side through an annular elastic body, and a PC steel material is passed through the wall thickness of the case and the elastic body to tension the PC steel material. After making them soft, we formed an embankment waterway by backfilling the boxes, so if consolidation subsidence occurs in the ground of the embankment, the embankment waterway can be opened freely according to the consolidation subsidence. Since it is curved and deformed, it is possible to prevent a gap from forming on the lower surface of the embankment waterway, and also to prevent a gap from being formed there due to displacement of the connecting part. ■ Since it is possible to form an embankment waterway directly on the construction floor for box burial without forming a pile foundation, it can be constructed easily and economically without requiring much effort or time.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of an embankment waterway constructed by the construction method of the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a cross-sectional view taken along the line I-I in Fig. 1, and Fig. 4 is An enlarged sectional view of the main parts, Figure 5 is a side view of the embankment waterway, and Figure 6 is a side view of the same curved form. A: Waterway for embankment 1: Box 2: Elastic body 3: PC steel material m: Embankment n: Patent for constructed floor for buried box Applicant: Kanto Regional Construction Bureau, Ministry of Construction
P.S. Concrete Co., Ltd.

Claims (1)

[Claims] A constructed floor for box burying that communicates between the river side and the outside is excavated in an embankment built along a river, and a plurality of boxes having openings communicating at both ends are directly placed on the constructed bed for box burying. At the same time, the case is continuously connected between the end faces of the opening side through an annular elastic body, and a PC steel material is passed through the thickness of the case and the elastic body to tension the PC steel material. A method for constructing a waterway for a river embankment, characterized in that the boxes are made soft and then buried.