JP2601140B2 - Independent mountain retaining wall method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a retaining wall construction for excavating a ground to prevent collapse of a surrounding ground.

[0002]

2. Description of the Related Art Conventionally, when excavation plane is large on a soft ground, for example, when one side exceeds 100 m, or when earth pressure is applied to one side in an area close to a river, the sea, or a slope, etc., a horizontal cutting has been conventionally performed. The beam method, the ground anchor method, and the island method are used.

[0003]

Conventionally, the horizontal beam cutting method is used in a case where the excavation area is about 100 m on a side, or in a region close to a river, the sea, or an inclined land, or the like, in which earth pressure is applied from one side. In such a case, it is no longer possible to support the axial force by the horizontal beam, and the axial force varies so much that the quality of the retaining wall cannot be guaranteed. In addition, the diagonal ground anchor method adopted under such conditions is often difficult to adopt due to restrictions on site conditions.

[0004] In such a case, the island construction method is adopted. However, since this construction method is a division work, the construction period is long, the construction cost is high, and it is not preferred at present.

[0005] Therefore, a soil cement pillar retaining wall which requires no muddy water treatment, discharges less mud than the other cast-in-place RC retaining method, has a shorter construction period, and is more economical can be considered. In this case, stable strength of the retaining wall cannot be expected due to insufficient strength and rigidity of the self-standing retaining wall against earth pressure.

[0006] In order to solve these problems, it is an object of the present invention to provide a self-standing mountain retaining wall construction method that utilizes the advantages of a soil cement pillar row retaining wall without using a beam.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] A soil cement pillar row retaining wall is formed, an on-site construction pile is formed on the ground excavation side, and primary excavation is performed. The gap is filled with one rectangular box-shaped member and two trapezoidal box-shaped members, a filler is injected into the gap between the formation pile, the members are bolted together, and integrated with the formation pile. Along the soil cement pillar row retaining wall between
Applied the bulge of the H-shaped steel, bolted to the rectangular box-shaped member, performed the final excavation of the ground, and sequentially performed the rectangular box-shaped member, the trapezoidal box-shaped member, and the H-shaped steel according to the excavation depth. Construct the stomach. An off-center anchor sleeve is provided on the on-site development pile, a PC steel wire as an anchor is laid on the ground, the gap is grouted, and the PC steel wire is tensioned at the pile top, and the desired compression is applied to the development pile. Gives stress and effectively exerts resistance to earth pressure.

[0008]

FIG. 1 is a plan view showing an embodiment of the present invention. The right side of the figure is the excavated ground.

Hereinafter, the method of the present invention will be described in detail step by step.

(A) A soil cement pillar row retaining wall 1 is formed at a position where the retaining is to be performed.

[0011] The soil cement pillar-column retaining wall 1 is obtained by mixing and stirring a cement-based turbid liquid, which is an injection liquid, with the in-situ soil, and inserting a core material at appropriate intervals into an overlap bored excavation hole. It is a retaining wall constructed in a column shape. H-shaped steel, I-shaped steel, steel sheet pile and the like are used as the core material. FIG. 1 shows an example in which H-shaped steel is continuously inserted.

(B) Next, a hole 2 ′ for an on-site formation pile is excavated near the soil cement pillar row retaining wall 1 on the ground excavation side.

(C) Iron core basket 2 ″ for reinforcing the formation pile 2
Into the borehole 2 ′. In this case, iron core basket 2 "
, A ground anchor sleeve 8 is set in advance at a position eccentric to the soil cement pillar row retaining wall 1 side.

(D) Concrete is poured into the drilling hole 2 'for the on-site formation pile.

(E) An anchor hole is drilled through the ground anchor sleeve 8 to the support layer ground, a PC steel wire 9 is wired, and the gap is grouted and solidified. Thereafter, the PC steel wire 9 is tightened and tied at the top of the pile, and an initial compressive stress is generated on the soil cement pillar row retaining wall 1 side of the formed pile 2.

(F) Primary excavation is performed on the excavation ground side.

(G) A rectangular parallelepiped box-shaped auxiliary material 3 is applied to the front surface of the formation pile 2 and the soil cement pillar row retaining wall 1. Further, two rectangular trapezoidal box-like supplements 4 are applied to the rectangular parallelepiped box-like supplementary materials 3 and the columnar forming piles 2, and the rectangular parallelepiped box-like supplementary materials 3 and the trapezoidal box-like supplementary materials 4 are applied. And filling the gap with the formation pile 2 with a filler to integrate the rectangular box-shaped supplement 3, the trapezoidal box-shaped supplement 4, and the formation pile 2.

(H) Between the rectangular parallelepiped box-shaped supplementary material 3 of the formation pile 2 and the rectangular parallelepiped box-shaped supplementary material 3 of the formation pile 2, the bulging 7 of the H-shaped steel is formed along the soil cement pillar row retaining wall. Then, bolting 6 is performed with the rectangular parallelepiped box-shaped auxiliary member 3.

(I) The final excavation of the ground is performed, and the rectangular parallelepiped box-shaped supplementary material 3 and the trapezoidal box-shaped supplementary material 4 are applied to the back surface of the formation pile 2 according to the ground depth as performed in (g). Further, the swelling 7 is bolted with H-shaped steel along the soil cement pillar row retaining wall 1.

(G) Construct a skeleton and remove the bulging.

FIG. 2 is a view as viewed from A in FIG. 1, and FIG. 3 is a view for explaining the method of the present invention in order from (a) to (i).

(A) Construction of pile retaining wall for soil cement columns (b) Drilling of holes for on-site construction piles (c) Insertion of iron core cage with sleeve for ground anchor (d) Concrete placement on on-site construction piles (e) Ground anchor Hole excavation, PC steel wire wiring, grout, tension (f) Primary excavation (g) Rectangular box-shaped supplementary material on the back of the created pile, trapezoidal box-shaped supplementary material application, H-shaped steel bulging setting (h) Final Excavation, if necessary, supplementary material on the back of the formation pile and setting of H-shape erection (i) Build the frame, erode and remove

[0023]

The effect of the present invention is that the earth cement is carried out with the column cement pile retaining wall and the on-site formation pile.

Except for special cases such as excavation of shallow ground, cut-off beams were used for the soil-cemented pillar pile retaining wall. The strength and rigidity of the soil cement pillar row retaining wall can be maintained by using the box-shaped and trapezoidal auxiliary materials.

Further, the eccentric anchor is tensioned and generates initial compressive stress in the on-site formation pile, so that it effectively exerts resistance when subjected to earth pressure. Therefore, the quality of the retaining wall can be maintained even when the excavation plane is large or when one side receives earth pressure. In addition, it is possible to work in an underground space without obstacles, which makes it possible to save labor, prefab, and mechanize construction, shortening the construction period and improving working conditions.

[Brief description of the drawings]

FIG. 1 is a top view of the present invention.

FIG. 2 is a view as viewed from A in FIG. 1;

FIGS. 3A to 3I are diagrams showing a construction procedure.

[Explanation of symbols]

1 ・ ・ ・ Soil cement pillar row retaining wall, 2 ・ ・ ・ Site creation pile, 2 ′ ・ ・ ・ Site hole for site creation pile, 2 ″ ・ ・ ・ Steel core cage,
3 ... rectangular box-shaped auxiliary material, 4 ... trapezoidal box-shaped auxiliary material, 5
··· Bolt, 6 ··· bolt, 7 ··· H-shaped steel protuberance, 8 ··· sleeve for ground anchor, 9 ··· PC steel wire, 10 ··· frame

Claims (2)

(57) [Claims] 1. A soil cement pillar row retaining wall is formed,
On the ground excavation side, an on-site formation pile is created, primary excavation is performed, and one rectangular box-like member and two trapezoidal box-like members are provided in the gap between the formation pile and the soil cement column row retaining wall for each of the formation piles. Filling, injecting filler into the gap between the formation pile, fastening the members together with bolts and integrating them with the formation pile, and along the soil cement pillar row retaining wall between the formation pile and the formation pile, forming an H-shape Filling the steel belly, bolting to the rectangular box-shaped member, performing the final excavation of the ground, and sequentially according to the excavation depth, the rectangular box-shaped member, the trapezoidal box-shaped member, and the H-shaped steel Self-standing mountain retaining wall construction method characterized by erection. 2. An anchor sleeve is provided eccentrically on an on-site formation pile, a PC steel wire serving as an anchor is laid on the ground, a gap is grouted, and the PC steel wire is tensioned at the top of the pile. The self-standing mountain retaining wall method according to 1.