JP3161394U - Reinforcing core material and underground structure using the reinforcing core material - Google Patents

Abstract

The present invention provides a reinforcing core material and an underground structure using the reinforcing core material that can ensure a desired cross-sectional performance without increasing the size of the core material to be used. A reinforcing core material embedded in an underground structure such as a parent pile sheet pile wall or a soil cement wall, wherein a plurality of rigid members are integrated. The present reinforcing core material and the underground structure using the reinforcing core material can exhibit the desired cross-sectional performance even if the clearance between the site portion and the existing structure is severe. [Selection] Figure 1

Description

  The present invention relates to a reinforcing core material embedded in an underground structure such as a main pile horizontal sheet pile wall or a soil cement wall, and an underground structure using the reinforcing core material.

For the retaining wall constructed before excavation of the ground, underground structures such as main pile side sheet pile walls and soil cement walls are used.
For example, in the case of a main pile horizontal sheet pile wall, H steel or the like is placed as the main pile, the H steel or the like is used as a rail portion for fitting the horizontal sheet pile, and in the case of a soil cement wall, each of the soil cement wall It is common to embed H steel or the like in a soil cement column to make a core material.

The size of the core pile embedded in the side pile of the main pile and the soil cement wall is designed from the resistance to various pressures such as earth pressure and water pressure (hereinafter simply referred to as “resistance”). .
However, in both methods, when the distance between the site boundary line and the outline line of the new structure is short, or when the construction area cannot be taken, there is a case where the core material having the necessary cross-sectional performance cannot be used.

  As a method for solving the above problems, it is possible to design a new core material having the necessary cross-sectional performance, but there is a problem that the construction cost becomes excessive due to the development cost and material cost.

In view of the above-mentioned conventional problems, the present invention aims at at least one of the following items.
(1) To provide a reinforcing core material and an underground structure using the reinforcing core material capable of designing desired cross-sectional performance and resistance.
(2) To provide a reinforcing core material and an underground structure using the reinforcing core material, in which construction costs are not excessive and the construction period is not prolonged.

In order to solve the above-mentioned problems, the present invention is a reinforcing core material embedded in an underground structure such as a main pile lateral sheet pile wall or a soil cement wall, wherein a plurality of rigid members are integrated and configured. To do.
Moreover, in the said device, the said rigid member is H steel, The flange part of each H steel was overlapped and connected, It is characterized by the above-mentioned.
Moreover, the said device WHEREIN: Each said H steel is overlapped and connected along the longitudinal direction of the flange part, It is characterized by the above-mentioned.

  In addition, the present invention is an underground structure such as a main pile side sheet pile wall or soil cement wall composed of one or a plurality of elements, and a reinforcing core material in which a plurality of rigid members are connected and integrated into one element. It is characterized by being arranged in.

According to the present invention, at least one of the following effects can be obtained.
(1) The desired cross-sectional performance and resistance can be ensured without increasing the size of the core material used.
(2) Since the existing core material can be used, the construction cost will not be excessive.
(3) Even if the clearance between the site boundary line and the outline of the new structure is severe, construction by the original method becomes possible.
(4) In construction on hard ground or the like, construction of the original construction method is possible without performing prior drilling, and extension of the construction period can be prevented in advance.

The schematic perspective view which shows one Example of the reinforcing core material of this invention. The cross-sectional schematic which shows the example of a connection of each rigid member at the time of using a different coupling tool in the reinforcement core material of this invention. The comparison figure when the reinforcement core material which concerns on this invention is installed, and the case where the conventional core material is installed. The schematic plan view of the main pile horizontal sheet pile wall using the reinforcement core material of this invention. The schematic plan view which shows the other example of arrangement | positioning of the reinforcing core material of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Overall Configuration FIG. 1 is a schematic perspective view showing an embodiment of a reinforcing core material of the present invention.
The reinforcing core material A according to the present invention is a member for improving the resistance of a portion in which the reinforcing core material A is embedded, for example, a parent pile in a main pile lateral sheet pile wall, a soil cement column in a soil cement wall, It is a member embedded in various element parts of underground structures such as.

<2> Reinforcing Core Material The reinforcing core material A is configured by connecting and integrating a plurality of rigid members.
As the rigid member, a long member having a known shape such as H steel, I steel, U steel, or a structure obtained by appropriately combining them can be used.
In the embodiment according to FIG. 1, three pieces of the same type of H steel are used as the rigid member, and a part of the flange portion of each H steel is arranged by slightly shifting the position of each H steel in the front-rear direction. Configure to overlap each other.

The arrangement form of each H steel in the present embodiment will be described in more detail.
The three H steels 11, 12, and 13 are in the same direction, and one H steel is slightly forward or backward (longitudinal direction of the web portion) with respect to the other adjacent H steel. They are offset. By setting the length to be shifted to the thickness of the flange portion, the flange portions are arranged so as to overlap each other.

  More specifically, the reinforcing core A according to FIG. 1 is arranged such that the flange portions 11c and 13c of the H steels 11 and 13 at both ends overlap with the flange portion 12c of the H steel 12 at the center. Similarly, the flange portions 11 b and 13 b of the H steel 11 and 13 at both ends are arranged so as to overlap the flange portion 12 b of the H steel 12 at the center.

In addition, this invention does not ask | require whether it arrange | positions so that the flange part 11c of the steel material 11 and the web part 12a of the steel material 12 may contact | connect.
The same applies to the relationship between the steel material 12 and the steel material 13.

<3> Connection Example of Rigid Members Next, connection examples of the rigid members will be described.
The rigid members constituting the reinforcing core material A of the present invention can be connected using various connecting tools. A connection place can be designed suitably.

FIG. 2 is a schematic cross-sectional view showing an example of connecting the rigid members when different connectors are used.
For example, FIG. 2 (a) shows a portion between the flange portion 11b of the H steel 11 disposed at one end and the flange portion 12c of the H steel 12 disposed at the center, and the flange portion 12c of the H steel 12 and others. The flange portions 13b of the H steel 13 disposed at the ends are connected by individual angle steels 21 respectively.

  Further, FIG. 2B is obtained by replacing the angle steel 21 in FIG.

  Moreover, FIG.2 (c) covers and connects the outer surface of each steel material 11 with the connection plates 23a and 23b along this outer surface.

  In addition, each rigid member which concerns on this invention can be connected also by well-known methods, such as welding and bolting.

<4> Functions and Actions FIG. 3 is a comparison diagram when the reinforcing core material according to the present invention is installed and when the conventional core material is installed.
The element C corresponding to the parent pile of the main pile and the soil cement column of the soil cement wall is embedded with the reinforcing core material A of the present invention in an opening provided by excavation or the like, and around the reinforcing core material A It is formed by filling a filler B such as in situ soil, mortar, cement milk or the like. The reinforcing core material A may be directly placed without excavating the ground, and is not limited to this embodiment.

According to the reinforcing core material A of the present invention, even if the H steel (height = L ₁ ) having a size smaller than the existing core material F (height = L ₂ ) made of a single H steel is used. The cross-sectional performance equivalent to the case where the existing core material F is used can be ensured.

  Therefore, according to the reinforcing core material of the present invention, the desired cross-sectional performance is exhibited even when the clearance between the site boundary line and the outline line of the new structure is severe in the construction of the main pile transverse sheet pile wall, etc. However, the wall thickness can be reduced, and the required clearance can be secured.

<5> Usage Example FIG. 4 is a schematic plan view of a main pile horizontal sheet pile wall using the reinforcing core material of the present invention.
The parent pile horizontal sheet pile wall D is an underground structure constituted by two parent pile portions D1 provided at intervals and a horizontal sheet pile D2 accommodated between the parent pile portions D1.
The reinforcing core material A used in the present example is an integrated stack of three H steels, and is embedded in the left and right parent pile portions D1 (corresponding to the element C) that accommodate the side ends of the transverse sheet pile D2. It constitutes a rail portion for storing the horizontal sheet pile D2.

At this time, it is desirable that the arrangement form of each H steel constituting the reinforcing member A is arranged such that the other H steels are sequentially shifted to the new structure region side with respect to the H steel on the side sheet pile D2 side. . With this structure, the earth pressure received from the site area E1 side does not work in the direction in which each H steel is uncoupled, so even if each H steel is only partially connected, it is reinforced by the earth pressure. The member A is not disassembled. In addition, the earth pressure is propagated sequentially to each H steel, and the earth pressure is not concentrated only on the H steel on the side sheet pile side, so that the proof stress as the whole reinforcing member can be surely exhibited.
If it demonstrates based on the parent pile D1 on the right side in FIG. 4, with respect to the H steel 11 on the side sheet pile D2 side, the reinforcing member A in which the adjacent H steel 12 is shifted and connected to the new structure region E3 side is buried. Yes. In this case, since the H steel 12 can also resist the earth pressure received by the lateral sheet pile D2, more effective proof stress can be ensured.

FIG. 5 is a schematic plan view showing another arrangement example of the reinforcing core member of the present invention.
Hereinafter, the arrangement form will be described for each figure.

[Arrangement Example 1]
The reinforcing core A according to the present embodiment (FIG. 5A) uses two H steels, and one H steel is shifted in the front-rear and left-right directions in the same direction, and a part of the flange portion Are arranged and connected to overlap each other.

[Example 2]
The reinforcing core A according to this example (FIG. 5 (b)) uses three H steels, and the H steels arranged in the center are arranged by rotating 90 ° from the H steels at both ends, and adjacent H steels. It arrange | positions and connects so that the web parts of steel may be substantially orthogonal.

[Arrangement Example 3]
The reinforcing core material A according to the present example (FIG. 5C) uses four H steels and is arranged and connected in a so-called zigzag pattern.

[Arrangement Example 4]
The reinforcing core material A according to the present example (FIG. 5D) uses two H steels, and the flange portions are connected to each other so that the longitudinal directions of the two web portions are substantially aligned. Is.

DESCRIPTION OF SYMBOLS 11, 12, 13: H steel 21: Angle steel 22: Channel steel 23a, 23b: Connection board A: Reinforcement core material B: Filler C: Element D: Main pile side sheet pile wall E1: Site area E2: Construction area E3 : New structure area F: Existing core material

Claims (4)

Reinforcement core material embedded in underground structure such as main pile side sheet pile wall or soil cement wall,
A reinforcing core material comprising a plurality of rigid members integrated. The reinforcing core material according to claim 1, wherein the rigid member is H steel, and flange portions of the H steels are overlapped and connected. The reinforcing core material according to claim 2, wherein the H steels are alternately overlapped and connected along the longitudinal direction of the flange portion. An underground structure such as a parent pile sheet pile wall or soil cement wall composed of one or more elements,
An underground structure characterized in that a reinforcing core material obtained by connecting and integrating a plurality of rigid members is disposed in one element.

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