JPH01102175A - Method of inwall construction of existing underground tank - Google Patents

Abstract

PURPOSE: To facilitate internal wall construction for underground tanks by connecting hoisting accessories to brackets projecting over the side wall of tanks, hanging travel rails from the hoisting accessories and arranging hoist cranes movable along the rails. CONSTITUTION: Brackets 2 each project inward over a side wall 1a of an existent underground tank so as to separably receive the upper end of a hoisting accessory 4 with an interposed turnbuckle 3. The hoisting accessory 4 suspends a travel rail 5 along which a hoist crane 6 can move. Such structural materials as lining panels suspended via an access port in the roof are brought between the scaffolding and the side wall 1a. Hoisting and travel motion of the crane 6 transfers these structural materials to desired places.

Description

[Detailed Description of the Invention] r Industrial Application Field 1 The present invention relates to a method for constructing an inner wall of an existing underground tank, and more specifically, a method for constructing a reinforced concrete wall, a steel plate lining wall, etc. for repair inside an existing underground tank. This relates to a construction method for the inner wall of an existing underground tank.

r Conventional technology 1 In the past, many new underground tanks have been constructed, but there have been no examples of construction work to repair the inner walls of existing underground tanks.
The underground tanks constructed in the early years have recently begun to require repair.

Problem to be solved by the invention 1 When constructing a new underground tank, the process starts with foundation work, then bottom plate work, side wall work, and roof work, so various large cranes are used on the ground. Construction materials could be delivered directly to the desired location, but if the side walls were to be repaired with new reinforced concrete walls or steel plate lining walls to repair the existing underground tank, those materials would need to be transported directly to the designated location on the roof. Because it is limited to importing from the entrance of
The materials must be lowered into the existing underground tank and then transported to the designated location, which is expected to be extremely difficult as large transport equipment cannot be used to transport the materials within the existing underground tank.

In view of the above, the present invention enables materials such as reinforcing bars and iron plates brought into the tank from above ground to be easily transported to a desired position along the inner circumferential surface of an existing underground tank, thereby improving work efficiency and shortening the construction period. The purpose is to provide a construction method for the inner wall of an existing underground tank that can be shortened.

Means for Solving Problems J In accordance with the above-mentioned object, the structure of the present invention having the gist of the above-mentioned claims is such that, in order to solve the above-mentioned problems, Bracket 2, 2 towards
．． 2... are provided protrudingly, and the upper end of a hanging tool 4 with a turnbuckle 3 interposed in the middle is connected to each bracket 2, and the inner periphery of the side wall 1a is connected by the hanging tool 4, 4, 4... A traveling rail 5 along the surface is suspended, and a hoist crane 6 that can move the traveling rail 5 as a guide is installed on this traveling rail 5.
The side wall 1a is further inside the running rail 5 on the inside of the rail 5.
Scaffolding 7 along the roof 10 is installed, and a material entrance 9 is provided at the lower part of the scaffold 7 using a gate frame 8.
After loading construction materials such as lining plates suspended into the existing underground tank 1 between the scaffolding 7 and the side wall 1a of the existing underground tank 1 through the material loading port 9, the hoist crane 6 is hoisted and moved. This technology is characterized by the fact that it is transported to a desired site.

゛ Effect 1 Therefore, in the method of constructing the inner wall of an existing underground tank according to the present invention, for example, the material carried into the center of the existing underground tank 1 is placed on a trolley or the like, and the material is transported from the material entrance 9 to the scaffold 7 and the side wall of the existing underground tank 1. 1a, a hoist crane 6 is positioned above the material entrance 9, and the hoist crane 6 lifts the material.The hoist crane 6 hoists and runs to move the material between the scaffold 7 and the existing construction. A desired rotation position direction (lateral direction) through the space between the underground tank 1 and the side wall 1a.
The material can be transported in the height direction and lowered onto the scaffold 7, or it can be held in the installation position by the hoist crane 6 as shown in FIG. 3, and installation work such as welding can be performed.

Generally, it is a difficult task to carry materials from the inside of the scaffolding 7 to the outside, and if the materials are large, the materials must be carried through above or to the side of the scaffolding 7. However, if a roof is installed, if materials are brought in through the top of the scaffolding, it will be impossible to bring in materials near the roof.Therefore, there is a method of placing the scaffolding only at a predetermined width and moving it one by one, but this method In complex processes such as inspecting repaired parts and removing defective parts, scaffolding may have to be moved to the same location again, resulting in unnecessary steps.
In the present invention, by installing the material import entrance 9, materials can be brought in even if scaffolds 7 are previously installed around the entire circumference.

Furthermore, the present invention removably connects the upper end of a hanging tool 4 with a turnbuckle 3 interposed in the middle to the bracket 2,
Since the traveling rail 5 along the inner peripheral surface of the side wall 1a is suspended by the hanging tools 4, 4.4..., the length of the brackets 2, 2.2... protruding from the side wall 1a The hoist crane 6 and the construction materials transported by the hoist crane 6 are moved to a part that is a predetermined distance inward from the side wall 1a, and the construction materials transported by the hoist crane 6 can be moved smoothly, and the traveling rail 5
It is a removable hanging type and its height can be adjusted with a turnbuckle 3, which improves and simplifies installation and removal work.

Embodiment 1 Next, an embodiment of the present invention will be described below, using an example of lining an existing underground tank 1 with a steel plate as shown in FIGS. 1 to 4.

In the figure, 1 is an existing underground tank, 1a is its side wall, 1b is the bottom plate, lc' is the existing lining steel plate, and 1c is the steel plate being lined.

The existing underground tank 1 usually has a side wall 1a made of reinforced concrete, and its inner surface is lined with a bottom plate 1b made of a steel plate and an existing lining steel plate 1c', and a roof 10 is constructed by placing roof trusses 12 at a plurality of locations on the top of the tank 1. The roof 10 has an entrance 11 (disposed to be used as an entrance for people and materials) and other connecting entrances 11', 11', 11'... (For loading and unloading stored items, for ventilation, for measurement, etc.).

First, as shown in FIG.
．． 2... are provided protrudingly, and the upper end of a hanging tool 4 with a turnbuckle 3 interposed therebetween is removably connected to each bracket 2, and the side wall 1 is attached to the side wall 1 by the hanging tools 4,4.
A traveling rail 5 along the inner circumferential surface of a is suspended, and a hoist crane 6 is disposed on this traveling rail 5, which is movable using the traveling rail 5 as a guide.

The brackets 2, 2, 2, etc. are made of H-shaped steel or the like, and their base ends are fixed to the upper surface of the side wall 1a where the roof truss 12 is not placed, and their tips are fixed to the side wall 1a. 1a
It protrudes toward the center of the existing underground tank 1 from the inner surface of the tank. In this embodiment, anchor bolts 21 are used to fix the bracket 2. This anchor bolt 21 is called a chemical anchor, and a hole 22 drilled in advance is filled with a filler 23 containing a solidifying agent separately, and when the anchor bolt 21 is inserted, the filler 23
A solidifying agent is mixed with the filler 23 to rapidly solidify the filler 23. This chemical anchor not only has excellent adhesion and pull-out strength after hardening, but also has sufficient strength even if water droplets adhere to the inner surface of the hole 22 or oil in the tank has penetrated. It is ideal for use within the existing nearby tank 1, and furthermore, it has sufficient vibration resistance even after hardening, and is highly durable against vibrations caused by the movement of the hoist crane 6, which will be described later. It is something.

Further, the hanging tool 4 has a bracket piece 2a having a hooking hole (not shown) protruding from the lower surface of the bracket 2, and a universal joint piece 4a is hooked and suspended from the bracket piece 2a. is formed by connecting hanging rods 4b and 4c via a turnbuckle 3 in the middle, and this bracket piece 2a
is omitted and a hooking hole is directly drilled in the bracket 2, or the universal joint piece 4a is omitted and the upper end of the hanging rod 4a is bent into a hook shape and the bracket 2 or bracket piece 2a is directly inserted.
It may also be hooked on.

The lower end of the hanging rod 4C of the hanging tool 4 is connected to a U-bolt 4d connected to the upper surface of the traveling rail 5 via a bracket piece 5a, but both the bracket piece 5a and the U-bolt 4d are omitted. The lower end of the hanging rod 4C may be welded to the traveling rail 5 or hooked in the form of a hook. In addition, since this hanging tool 4 may swing around its upper end, it is recommended that the correct reading 2' be connected between it and the side wall 1a so that the distance between the traveling rail 5 and the side wall 1a does not change. .

Furthermore, the hoist crane 6 has wheels 6a.

The wheels 6a, 6a, . . . are suspended from the running rail 5, and one of the wheels 6a, 6a, 6a, . None.

Next, the present invention arranges a scaffold 7 along the side wall 1a inside the side wall 1a of the existing underground tank 1 and further inside the traveling rail 5, and a gate form 8 is provided at an appropriate position below the scaffold 7. A material entrance 9 is provided.

The installation of this scaffolding 7 and the installation of the traveling rails 5 to hoist crane 6 may be done first, but if the scaffolding 7 is not installed, it is impossible to install the traveling rails 5, etc. If the scaffolding 7 is installed first, and if the traveling rail 5 etc. can be installed without installing the scaffolding 7, then the traveling rail 5 etc. is installed first and the hoist crane 6 is used to assemble the scaffolding 7. 7. It is recommended to use it as a conveyance device for component members.

The scaffold 7 is a frame scaffold, and is disposed around the entire inner circumference of the side wall 1a of the existing underground tank 1, and near the upper end of the side wall 1a, although not shown. The gate frame 8 is made up of a supporting beam 8a supported by pillars 8b, 8b, and although it is not necessarily clear from the diagram, a steel square pillar may be laid horizontally on the upper surface of the supporting beam 8a, or a wooden Lay the scaffolding boards and place the frame scaffolding on top of them.

Next, according to the present invention, construction materials such as lining plates, which are suspended into the existing underground tank 1 from the entrance 11 of the roof 10, are transported through the material entrance 9 to the scaffold 7 and the side wall 1 of the existing underground tank 1.
After taking it in between A and A, the hoist crane 6 hoists and travels to transport it to a desired location. Since the hoist crane 6 can hoist and travel at the same time, construction materials can be transported the shortest distance along the side wall 1a, and after being transported to a predetermined position, they are hoisted onto the hoist crane 6 as shown in Figure 3. The installation work is carried out while the machine is hanging down, and once the installation and fixation are completed, the construction material is unsuspended, and the machine travels again, winding it up and rewinding it to transport the new construction material.

"Effects of the Invention j The present invention is as described above, and the traveling rail 5 is connected to the bracket 2.
, 2.2..., the traveling rail 5 can be installed at the required height and position without being hindered by the upper structure (roof truss, etc.) of the existing underground tank 1. Furthermore, the construction materials brought in between the side wall 1a and the scaffold 7 from the material entrance 9 can be transported to the desired location with good workability by the hoist crane 6 arranged on the traveling rail 5. It is possible to provide a construction method for the inner wall of an underground tank.

Moreover, the present invention detachably connects the upper end of a hanging tool 4 with a turnbuckle 3 interposed in the middle to each bracket 2, and the inner circumferential surface of the side wall 1a is connected by the hanging tools 4, 4, 4, . Since the traveling rail 5 along the road is suspended, installation and removal of the traveling rail 5 can be easily performed by attaching and detaching the hanging device 4, and this construction method does not involve the difficulty of incidental construction. is capable of providing

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of an existing underground tank under construction using the construction method of the present invention, Figure 2 is a cross-sectional view of the main parts of the equipment used in the present invention,
FIG. 3 is a perspective view of essential parts for explaining the operation, and FIG. 4 is a partial front view of the scaffold used in the present invention.

Claims (1)

[Claims] A hanging device in which inwardly projecting brackets 2, 2, 2, . The upper ends of 4 are removably connected, and the running rail 5 along the inner circumferential surface of the side wall 1a is suspended by the hanging tools 4, 4, 4...
A hoist crane 6 is disposed on this running rail 5 and is movable using the running rail 5 as a guide. A scaffolding 7 is installed along 1a, and a material entry port 9 is provided at a suitable location below this scaffolding 7 using a gate frame 8, and a material entry port 9 is provided at the lower part of the scaffolding 7, and a material entry port 9 is installed inside the existing underground tank 1 through a material entry port 11 on the roof 10. The construction material is introduced between the scaffolding 7 and the side wall 1a of the existing underground tank 1 through the material entrance 9, and then transported to the desired site by hoisting and running the hoist crane 6. Construction method for inner walls of existing underground tanks.