JPS6358975B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a member for forming a retaining wall that is constructed around a planned excavation location during underground construction work such as the construction of an underground structure, for example.

As this type of retaining wall forming member, soil columns made of a hardened mixture of cement milk, excavated soil, etc. have conventionally existed, but in the case of this type, soil columns between adjacent columns in the ground water layer of the ground have been used. There was a problem in that thin parts were diluted before hardening, or cracks were likely to occur due to water pressure or earth pressure, resulting in a decrease in strength and water-stopping performance. Therefore, as described in JP-A No. 53-27212, for example, concrete piles are manufactured in advance to serve as members for column rows and have a bulging arc surface and a recessed arc surface at the front and rear along the longitudinal direction. The upper end of this concrete pile is removably crowned with a thin pile having approximately the same external shape as the concrete pile to form a retaining wall forming member, and a plurality of these retaining wall forming members are placed adjacent to each other. A series of retaining walls are constructed by connecting concrete piles to the groundwater aquifer by installing them in parallel so that the bulging arc surface of one matching retaining wall forming member is in close contact with the recessed arc surface of the other retaining wall forming member. It has been proposed that the thick pile be removed after being formed, but concrete piles and those with a special shape that make it difficult to obtain thick piles with almost the same external shape as the concrete piles have been proposed. Therefore, there is a problem in that it takes time and effort to manufacture these, and it also takes time and effort to relative position the adjacent retaining wall forming members.

In other words, when burying the retaining wall forming member while hanging it, if one bulging arc surface is lowered along the other recessed arc surface, the bulging arc surface and the recessed arc surface will face each other. Although it is easy to maintain this posture, it is not sufficient to regulate the distance between the bulging arc surface and the recessed arc surface, and requires a separate movement to bring the bulging arc surface and the recessed arc surface into close contact. It was essential.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a retaining wall forming member that is inexpensive and easy to construct by devising a water-stopping structure.

The characteristic structure of the retaining wall forming member according to the present invention to achieve the above object is that adjacent steel pipes are fitted and connected to each other along the longitudinal direction to maintain a water-tight state between the adjacent steel pipes. A columnar steel pipe with a closable rib-shaped water stop part protruding from its outer circumferential surface, and an outer diameter smaller than the inner diameter of the steel pipe, which is coaxially connected to the steel pipe at the upper end side of the steel pipe. a guide member having a rod having a diameter, and a guide rail portion that is removably connected to the upper end of the steel pipe in a posture surrounding the outside of the rod, and that is connected to the water stop portion in a connected state; A coupling device that switches the steel pipe and the guide member between a coupling attitude and a coupling release attitude in which the water stop portion and the guide rail portion are connected in a straight line by relative rotation between the steel pipe and the guide member; and is configured to engage the water stop portion of the adjacent steel pipe with the guide rail portion and guide the pipe to fit into the water stop portion continuous to the guide rail portion, and such The structure provides the following effects.

That is, a contact surface is formed on the side surface of the column row member of the retaining wall forming member to bring the adjacent column row members into close contact with each other along the longitudinal direction, so that the spaces between the column row members are closed. Rather than making it possible to close the column row members in a water-stop state by closely contacting them, it is possible to close the space between the column row members in a water-stop state by connecting the rib-shaped water stop parts. Therefore, there is no need to process the column row member into a special shape, and easily available steel pipes can be used as the column row member.

Moreover, since the rib-shaped water stop portions are connected by fitting into each other along the longitudinal direction, when connecting the mountain stop wall forming member to the existing mountain stop wall forming member, the water stop portions are connected to each other in the longitudinal direction. The shape of the guide member having the guide rail that guides the water stopper to fit into the water stop portion of the existing retaining wall forming member does not need to be processed into a special shape as long as the guide rail can be fixed.

In addition, since the rib-shaped water stop portions are fitted and connected to each other along the longitudinal direction, the stop wall forming member can be precisely positioned with respect to the existing stop wall forming member to stop water. By connecting the guide member to the steel pipe, a series of guides is formed by the guide rail part and the rib-shaped water stop part, so it can be connected to the existing stop wall forming member. Adjacent retaining wall forming members can be efficiently connected while effectively utilizing the water portion.

Furthermore, since a bar is connected to the upper end of the steel pipe, it is possible to effectively prevent strata above the groundwater layer using a small amount of material. Since the rod is formed to have a smaller diameter and is coaxially connected to the steel pipe, when the guide member is removed from the steel pipe, this rod also functions as a guide for removing the guide member, making it easy to remove the guide member. can be done.

In particular, in the present invention, in removably connecting the steel pipe and the guide member, a coupling device is provided that can connect and disconnect the steel pipe and the guide member by relative rotation between the steel pipe and the guide member. In addition to making it easier to attach and detach the members, the guide rail part and the water stop part are connected in a straight line when the steel pipe and the guide member are connected and positioned.
It is extremely easy to align the guide rail part and the water stop part.

Therefore, it can be manufactured at low cost as a whole, and
It has now been possible to provide a mountain retaining wall forming member that can be easily constructed and can effectively retain the mountain strata above the groundwater layer.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 to 6, a vertical hole h is drilled in the ground using an excavator such as an earth auger 1 in a state in which they are connected and parallel to each other and cement milk is injected, and the cement milk is poured into the ground. By solidifying it, a continuous column-shaped retaining wall is constructed.

The part of the pillar row A for the retaining wall from the ground surface GL side to near the water surface WL of the groundwater layer is the soil pillar row wall A1, and the lower part is a column row made of steel pipe members with excellent water-stopping properties. Wall A2 is used.

The soil column wall A1 is composed of a mixture a of excavated soil and cement milk, etc., and an H-shaped steel 2 as a bar inserted into the mixture a.

The column wall A2 made of steel pipes is made of a mixture a of excavated soil and cement milk, etc., and a circular steel pipe 3 for the column column inserted into the mixture a.

The retaining wall forming member is composed of the H-shaped steel 2, the steel pipe 3, and the guide member 6.

2: changing the position of the outer peripheral surface of the steel pipe 3 by 180 degrees;
Rib-shaped water stop portions 4 and 5 extending along the tube axis direction and having an uneven cross section that can close the space between adjacent steel pipes 3 in a water-stop state are fixed to the locations.

Further, by guiding the adjacent steel pipe 3 downward along the H-shaped steel 2 with respect to the upper part of the steel pipe 3, the concave water stop portion 4 of the adjacent steel pipe 3 is moved to the convex water stop portion 5 of the existing steel pipe 3. A cylindrical guide member 6 having a convex guide rail portion 6a is configured to be able to be connected and disconnected from each other.

To configure the connector between the guide member 6 and the steel pipe 3, the inner peripheral surface of the lower end of the guide member 6 has an angle of 180
At the same time, the connecting pieces 7, 7 are fixed to the two places that have been displaced by 30 degrees, and in the circumferential direction of the inner circumferential surface of the upper end of the steel pipe 3.
At the two locations displaced by 180 degrees, the guide member 6 can be freely engaged with and disengaged from the connecting pieces 7, 7 by rotating around the three axes of the steel pipe, and the guide member 6 is in the engaged state. Connected pieces 8, 8 which abut and restrict the extraction movement are fixed.

The H-shaped steel 2 and the steel pipe 3 are integrally connected via a plate 9.

To excavate the vertical hole h, as shown in Figs. An excavation blade 11 larger than the diameter is attached, and the excavation blade 11 and the earth auger 1 excavate and discharge soil to a required depth together with the casing 10. After excavation, the earth auger 1 and casing 10 are pulled out from the vertical hole h.

Further, the guide member 6 is configured to be extracted from the vertical hole h and used as another guide when the construction of a plurality of guide members is completed.

Next, another example will be listed.

[] The water stop portions 4 and 5 of the steel pipe 3 are configured to have a shape other than those in the above-mentioned embodiments, for example, a bow-shape or a U-shape.

[] As the bar material, other steel materials such as Z-beam steel, angle-beam steel, T-beam steel, groove steel, etc. are used instead of the H-beam steel 2.

[] In the above-mentioned embodiment, after drilling the vertical hole h, an integral body of the steel pipe 3 and the H-shaped steel 2 provided with the guide member 6 was inserted into the vertical hole h, but instead of this, the steel pipe 3 The earth auger 1 is inserted into the cylindrical guide member 6, and the earth auger 1
The structure may be such that the steel pipe 3 and the cylindrical guide member 6 are inserted simultaneously while excavating and discharging the soil. In this case, as shown in FIG. 7, the connected pieces 8, 8 on the steel pipe 3 side and the connecting pieces 7, 7 on the guide member 6 side are not uncoupled unexpectedly by the earth auger 1, and the external surface After inserting the steel pipe 3 and the guide member 6, and pulling out the earth auger 1, insert and hold the H-shaped steel 2 in a predetermined position inside both of them 3 and 6, and then insert the guide member 7. is disconnected from the steel pipe 4 and taken out.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the retaining wall forming member according to the present invention, and FIGS. 1A and 2B are construction process diagrams, and FIGS.
A line sectional view, FIG. 4 is a partially cutaway perspective view, FIGS. 5 and 6 are a cross-sectional view and a longitudinal sectional view showing the excavation state,
The figure is a partially cutaway perspective view showing another embodiment. 2...Bar material, 3...Steel pipe, 4, 5...Water stop part,
6... Guide member, 6a... Guide rail part,
7, 8...Connector.

Claims (1)

[Claims] 1. Adjacent steel pipes 3 are fitted and connected to each other along the longitudinal direction, and rib-shaped water stop portions 4 and 5 are projected on the outer peripheral surface, which can close the space between adjacent steel pipes 3 in a water-stop state. A steel pipe 3 for a row of columns is installed, a bar 2 that is coaxially connected to the steel pipe 3 on the upper end side of the steel pipe 3 and has an outer diameter smaller than the inner diameter of the steel pipe 3; a guide member 6 that is removably connected to the upper end of the steel pipe 3 in a posture surrounding the outside of the material 2, and has a guide rail portion 6a that is connected to the water stop portion 4 or 5 in the connected state; 3 and the guide member 6, a connection posture and a connection release posture in which the steel pipe 3 and the guide member 6 are connected in a state where the water stop portion 4 or 5 and the guide rail portion 6a are linearly connected. Connectors 7 and 8 that switch to
and to engage the water stop portions 4 or 5 of adjacent steel pipes 3 with the guide rail portion 6a, and guide the steel pipes so as to fit into the water stop portions 4 or 5 connected to the guide rail portion 6a. A retaining wall forming member configured as follows.