JP3054936U - Wellhead fixing liner plate fixing plate - Google Patents

Abstract

(57) [Summary] (Modified) [Problem] To provide an installation method for safely, easily, and firmly securing the ground at the ground of a circular shoring having assembled a liner plate to be installed at the entrance of a steel tower foundation pit. . SOLUTION: An inner shaft support 4 (LP, 6-piece circular form having a diameter of 3 mφ) for a shaft installed at the first stage of a wellhead,
Outer shore support 3 (LP, 8
A steel plate having a thickness of 3.2 mm is provided in a donut shape around the gap between the steel plate and the circular plate having a diameter of 4 mφ.
The sole plate 1 is formed to have a width of about 56 cm and a radius of curvature R of the inner support 4 so that the bottom support can be fixed on the ground in the wellhead by connecting the inner and outer supports 4 and 3 with each other. The arc of the arc corresponding to the radius R has a fan shape with an inner angle of 45 degrees, the dimensions and the interval P of the bolt holes drilled on both the inner and outer peripheral edges of the floor plate 1 are matched with those of the liner plate 2 and the set number of the floor plates 1 is supported outside. The number was the same as the number of components (eight) in the process 3.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to the installation of circular supports (forms combining arc-shaped liner plates) used for excavating foundation shafts (vertical shafts) such as steel towers. As shown in the figure, the method relates to the method of fixing the inner support for the shaft and the outer support for the retaining fence installed concentrically around the outside of the shaft to secure the ground around the pit. Here, a method of installing a shoring using a liner plate (hereinafter also referred to as LP) at the entrance of a shaft (3 m in diameter) for MR, deep foundation, etc. will be described as an example.

[0002]

[Prior art]

 Conventionally, as this type of shoring installation method, as shown in Fig. 4 and the enlarged view on the right side, after the first shoring (4) is constructed at the wellhead, to secure the safety of excavation work inside the mine In addition to fixing the first-stage support (4) with a wire, in order to prevent the sedimentation of the sediment around the wellhead and the inflow of rainwater into the mine, land is secured around the outer periphery of the first-stage support (4). The concrete (5) is cast over a thickness of 30 to 50 cm and a width of 50 cm to 1 m to consolidate the wellhead.

[0003]

[Problems to be solved by the invention]

 In the method of installation and fixing of the shoring by placing the ground concrete (5) described in the above-mentioned prior art, the work is time-consuming due to the time required for the construction, and the work cannot be performed in bad weather (rainfall). In addition to the need for a curing period (2 to 3 days) after construction, transport of aggregates (such as helicopters and cableways) was not easy, and workability and workability were poor.

[0004] Furthermore, with the removal of the support after the completion of the pillar-type concrete concrete (6) based on the steel tower, the ground-side concrete concret (5) must be dismantled and carried out, and the production and polishing work must be performed. There were many problems, including becoming

The present invention has been made in view of the above-mentioned problems of the conventional method, and its purpose is to provide an inner support (4) for a shaft installed at a wellhead and a supporter for the support. A fan-shaped slab (1) is surrounded between outer supports (3) for consolidation fences installed concentrically around the outer periphery, and they are connected and engaged with each other, facilitating the work of consolidating the wellhead support. It aims to provide a construction method that is easy, safe, reliable, and can be implemented in a short time.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the shape, dimensions (width, inner and outer perimeters, and inner angles) and the number of sets of one fan-shaped slab in the present invention, as shown in Figs. Connecting between the shoring (LP, 6-piece circular pit with a diameter of 3 mφ) and the outer shoring (LP, 8-piece pit with a diameter of 4 mφ) constructed concentrically For this reason, the number of sheets of about 56 cm in width was set to the same number as the number of outer supports, and eight pieces of segment type (fan-shaped) sheets having an inner angle of 45 ° were set as the number of sheets.

[0007] As shown in FIG. 1, the diameter and the interval of the bolt holes formed in the inner and outer peripheral edges of the fan-shaped flooring plate were set to 21 mmφ and 157 mm in accordance with those of the LP.

Further, regarding the thickness and weight of the floor plate, a 3.2 mm steel plate is used in consideration of workability such as handling and transportation in addition to appropriate strength. As a result, the weight per one of the divided slabs was reduced to 20 kg or less.

[0009]

【Example】

 Embodiments will be described below with reference to the drawings. Figures 5 (A), 5 (B), and 5 (C) show the installation of a support (circular formwork, pit diameter 3m) using an arc-shaped LP (2) as a retaining material for excavating a foundation pit for a steel tower. In the first step (A), the work space was secured by cutting and embanking the soil around the foundation pit, opening the excavation hole (9), and drilling to a depth of 0.5 m. After the excavation, the first stage LP (2) consisting of six pieces per set is assembled in the mine and installed horizontally. Backfill the earth and sand between the outer periphery of the first-stage inner support (4) installed below the ground surface and the ground, firmly stiffen, and firmly set the support (4) at the wellhead. . Thereafter, the inside of the mine is dug, and the second and third inner supports (4) are sequentially assembled and set, and the installation of the inner support (4) at the lower part of the underground (1 to 3 steps) is completed.

In the second step (B), eight floor plates (1) are fitted around the inner support (4) in accordance with the upper surface flanges (22) of the first inner support (4) on the ground surface. The laying of the slab (1) around the cross section is completed by laying (bolt joining) in the shape. Further, the outer peripheral edge of the bottom plate (1) provided around the outer periphery of the inner support (4) and the lower surface flanges (23) of the eight LPs are connected (bolt-joined) to each other, and the height is 0.5 m. An outer shoring (3) will be constructed for the retaining fence.

[0011] In the third step (C), six LPs (2) of the second to third stages are sequentially placed (bolt-joined) on the inner support (4) of the first stage, and a 1 m high Completing the inner support for the pit (4). If necessary, eight LPs (2) of the second stage are sequentially mounted (bolted) on the outer support for the retaining fence (3), and the outer support (3) is raised. An entrance (7) is provided in the outer shoring (3) and an elevating port (8) is provided in the inner shoring (4) to complete the installation of the inner and outer shoring at the wellhead.

[0012]

[Effect of the invention]

 Since the present invention is configured as described above, it has the following effects.

[0013] By not pouring the ground concrete for fixing the shoring, no industrial waste is generated, so that environmentally friendly construction can be performed.

[0014] The work can be easily carried out by hand, so that the work is not required, and it is not affected by the weather, so that there is no need to wait for the work.

Further, since the laying work can be performed simultaneously with the liner plate installation process, workability is good.

[0016] Furthermore, since the support work can be easily and reliably fixed as compared with the method of placing concrete on the ground, the workability and the functionality are excellent.

[0017] In addition, according to the present invention, the transportation to the construction site and the handling of the equipment are easier than in the conventional method, and the workability and workability are improved, such as the reusability of the flooring plate, and the construction cost is reduced. Economic effects can be obtained by the reduction.

[Brief description of the drawings]

FIG. 1 is a plan view and a cross-sectional view showing the shape of a sole plate.

Fig. 2 Inner and outer supports constructed concentrically (circular formwork)
It is a top view showing the state where the interval was surrounded by eight sole plates. (LP consists of 6 sheets inside and 8 sheets outside)

FIG. 3 is a front view showing the shape of a liner plate (one sheet);
It is a plane and sectional view.

FIG. 4 is a schematic diagram showing the construction of an inner and outer shoring (circular formwork) at a wellhead and a method of solidification of the ground, where the left side is a conventional ground and the right side is a conventional ground. This shows the case where concrete is cast.

FIG. 5 is a perspective view showing a construction procedure from installation of inner and outer supports (circular formwork) to be installed for a shaft, to laying a fan-shaped floor plate between both supports and solidifying a wellhead, A) is to dig a hole of 0.5m depth according to the diameter of the pit, install the first inner support (4) in the lower part (under the surface) vertically in the ground, and It shows the state where the space is backfilled and compacted.
(B) shows eight laying plates sequentially laid in a donut shape by bolting along the upper surface flange of the inner support (4), and then concentrically around the outer peripheral edge of the lay plate and the outer periphery of the inner support (4). The figure shows a state in which eight outer supports (3) for retaining fences to be constructed are sequentially bolted and the inner and outer supports are connected. (C) shows a state in which an entrance hole is constructed in the outer shoring (3), an elevating port is constructed in the inner shoring (4), and the pit portion for excavating the steel tower foundation is completed.

[Explanation of symbols]

1 Base plate (sector type, segment type) 11 mm bolt hole 2 Liner plate (arc shape) 21 mm bolt hole 22 mm upper flange (circumferential direction) 23 mm lower flange (mm) 24 mm side flange (axial direction) 3) Outer side support (for earth retaining fences, pit diameter 4mφ) 4 Inner side support (for vertical shaft, pit diameter 3mφ) 5 Underground concrete (for fixing support) 51 Backfill concrete (mortar) 6 Column concrete (reverse T) 7 Entrance 8 Elevator 9 Vertical shaft (Drilling hole) L Flange length in the circumferential direction of arc-shaped liner plate L ₁ Outer perimeter of fan-shaped bottom plate L ₂内 Inner perimeter P interval (bolt hole) W Base plate width R radius G Gap LP Approximately t thickness of the liner plate D ₁ shaft diameter (outside, support) D ₂ shaft diameter (inside, support) H ₁ height (outside, support) H ₂ 〃 (inside, support) θ circle Interior angle of arc

Claims (1)

[Utility model registration claims] 1. A shape of a sector (an inner angle of an arc of 45 degrees), dimensions of width 564 mm, thickness 3.2 mm, outer peripheral length 1,
A steel plate (1) having a length of 570 mm and an inner circumference of 1 and 178 mm, wherein the dimensions and spacing of bolt holes (11) formed in the inner and outer peripheral edges of the plate (1) are arc-shaped. 2) Bolt holes (2)
A mating plate for fixing a liner installation liner plate (2), which matches with that of 1) and is formed so as to be bolted to each.