JPH0444717Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scaffolding device suitable for use in, for example, connecting segments to each other when constructing a vertical shaft using the submerged box method.

[Conventional technology]

Conventionally, when constructing a vertical shaft underground for the construction of deep wells, underground tanks, etc., the underground tunnel method, which is easy to work and efficient, was used while the depth was relatively small, and the underground tunnel method was used as the depth increased. When a construction method becomes unusable, it is common to switch to a deep foundation construction method.

In the above-mentioned submerged box construction method, as shown in Fig. 6, arc plate-shaped concrete segments 12 with joint recesses 11 formed in the upper, lower, left and right edges are connected in a cylindrical shape to form a cylindrical wall body, and the inner bottom part of the concrete segment 12 is connected in a cylindrical shape. While excavating and sinking the excavation, segments 12 are successively piled up in a cylindrical shape on top of the excavation.

In this construction method, as the excavation depth increases, the work of joining the segments 12 must be done at a high place when viewed from the bottom, so it is necessary to construct a sturdy scaffold from the standpoint of safety and work efficiency.

Conventionally, this scaffolding has been constructed by using pipes and the like for general construction scaffolding as members and assembling the scaffolding from the bottom.

[Problem that the invention attempts to solve]

Incidentally, the scaffold construction work described above is dangerous and inefficient because the work itself is performed at a high place. Also, each time a segment is stacked up, it must be replaced. Additionally, building a sturdy scaffold requires a large amount of space, which can get in the way of other tasks. Moreover, since the cylindrical wall itself sinks, there is a problem that it cannot be supported by both the bottom and the wall.

[Means for solving problems]

In order to solve the above problems, the present invention provides a scaffolding board having an annular outer edge that fits into the inner surface of a cylindrical wall formed by connecting a plurality of arcuate plate segments, and the outer edge has the A holding member that is inserted into the joint recess and holds the scaffold board is slid in the radial direction of the cylindrical wall at a position opposite to the joint recess for connecting the segments provided on the upper edge or the lower edge of the segment. It is designed to be movable.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 6. In these figures, reference numeral 1 denotes a scaffolding board having an annular outer edge 3 set to be slightly smaller than the inner diameter of the cylindrical wall 2. This scaffold board 1 has a partially cutout hollow disc shape as a whole, and is formed by laying a wire mesh 6 on a frame made of a steel frame material 4 and a beam material 5, and has a joint at the center in the circumferential direction. 7 so that it can be divided into two parts. The opening 8, which has a circumferential angle equivalent to about 70 degrees, is provided as a space for a ladder or other equipment, and is reinforced by being joined by a beam 9 with a flange. In addition, the inner arcuate frame material 4 has hooks 1 for securing wires for hanging by a crane.
0 and a safety handrail (not shown).

The cylindrical wall body 2 is formed by connecting arc-shaped concrete segments 12 in the upper, lower, left, and right directions, each of which has joint recesses 11 at its upper, lower, left, and right edges, as shown in FIG. The joint recess 11 is formed by opening on the inner surface of the segment 12, the top and bottom surfaces, or the left and right sides, and a joint fitting 14 having a bolt hole 13 is buried flush with the top and bottom surfaces or the left and right sides, as shown in FIG. Adjacent segment 1 as shown in
The two joint fittings 14 are connected by bolts 15,
The segments 12 are connected to each other. In addition, the joint recess 11 is formed to perform the bolt tightening work, and after the cylindrical wall 2 is formed, retightening and segment embedding are performed for reinforcement, so the inner surface is It is provided with an opening.

Reference numeral 16 denotes a suitable number (four in the example) of the outer edge 3 of the scaffold board 1 at a position facing the joint recess 11.
It is a holding member provided. The holding member 16 is formed in a U-shape with a downwardly opened cross section, and is attached to be slidable in the radial direction by a sliding mechanism 18 between guide members 17, 17 vertically provided on the lower surface of the outer edge portion 3. ing. The sliding mechanism 18 includes a cylindrical first pin 20 welded to both side walls 19, 19 of the holding member 16, and a cylindrical first pin 20,
The first sliding groove 21 is welded between the guide members 17, 17, and the first
A cylindrical second pin 22 fitted into the sliding groove 21
are formed on the guide members 17, 17, and the first
A second sliding groove 23 into which the pin 20 is inserted. The first pin 20 and the second pin 22
also function as reinforcing members for the holding member 16 and the guide member 17, respectively. Also,
The length of the first and second sliding grooves 21 and 23 is the length of the holding member 1.
This is set approximately equal to the movement stroke of 6.

On the other hand, a mounting plate 24 is provided above the holding member 16 of the scaffold board 1, and this mounting plate 24 and the holding member 16
A lock mechanism 26 is provided between the top plates 25 to prevent unnecessary movement of the holding member 16.
The locking mechanism 26 includes a shaft pin 28 fitted into a pin hole 27 formed in the top plate 25, a cylindrical elastic member 29 and a pipe member 30 inserted into the shaft pin 28, and a pipe member 30. The lock plate 31 is welded to the lower end surface of the lock plate 31 and has a half-disk shape, and a lock groove 32 is formed on the mounting plate 24 and into which the lock plate 31 is inserted. The length is set approximately equal to the movement stroke of the holding member 16. This locking mechanism 26 is such that the locking plate 31 locks into the locking groove 32 when the holding member 16 is extended or contracted.
It has been inserted into the system and is functioning properly.

Next, the use of the scaffolding device configured as described above when applied to the submerged box construction method will be explained with reference to FIG. 5. This figure shows that as a result of excavating the bottom B of the shaft H, the cylindrical wall 2 formed of concrete segments 12 sinks, and the uppermost segment 1
A new concrete segment 12b has been set on top of one of the two segments 12a by the crane C1 on the ground, while the scaffolding device A has been set in one stage by the crane C2 in order to bolt the joint fittings 14 of the upper and lower segments 12a and 12b. It has been moved from the lower joint recess 11 to the upper joint recess 11.

To describe the actions of the sliding mechanism 18 and the locking mechanism 26 in this process in detail with reference to FIGS. 2 to 4, with the scaffolding device A held in the joint recess 11, the scaffolding board 1 is slightly lifted by the crane C2, When the pipe member 30 is moved upward against the bias of the elastic member 29, the lock plate 31 is moved into the lock groove 32.
The holding member 16 becomes slidable. Therefore, when the pipe member 30 is moved inward, it is slid inward by a stroke determined by the lengths of the first and second sliding grooves 21 and 23 and the lock groove 32, and in this state, the shaft pin 28 is rotated 180 degrees. Then (see FIG. 4), the locking plate 31 is fitted into the locking groove 32 again, and the holding member 16 is locked. Since the fitted lock plate 31 is appropriately biased by the elastic member 29, it will not easily come off.

After repeating the above process, the scaffolding board 1 becomes free with all the holding members 16 retracted, is hoisted up to the upper joint recess 11 by the crane C2, and is rotated horizontally to align the position. , by performing the above process in reverse, the joint recess 11 is re-opened.
It will be held in the state.

Since the scaffold board 1 is provided with an opening 8,
Even if a ladder or the like is installed for workers to enter and exit from the bottom B, there is no need to move it every time the scaffolding board 1 is moved.

The use of the scaffolding device according to the present invention is of course not limited to the bolt tightening work described above, but also the aforementioned bolt tightening work,
It can be used for filling joint recesses (performed from above), painting, and any other work inside a shaft, and is particularly useful for work that requires machinery and equipment. It may also be used for tasks such as transporting machines and personnel to the bottom.

Furthermore, if the scaffold board becomes an obstacle for another task, it can be lowered to the bottom or placed on the ground, which is easy.

The scaffolding device of the above example can be transported in two parts, making it convenient to transport and easy to assemble. In addition, since there are only a few places to be tightened during assembly, accidents such as forgetting to tighten are less likely to occur. The frame is made of wire mesh, making it strong and lightweight. It can be moved up and down easily and quickly, and can be easily transported to the ground when not needed.

Attachment and removal to and from the joint recess are performed quickly and reliably by the sliding mechanism and locking mechanism, and since the joint recess is originally provided in the segment, there is no need to newly provide the joint recess.

Note that the implementation of the present invention is not limited to the above example, and the presence or absence of an opening, the size of the opening, the number of holding members, the number of divisions of the scaffold board, etc. may be selected as appropriate.

[Effect of idea]

The present invention provides a scaffold board having an annular outer edge that fits into the inner surface of a cylindrical wall formed by connecting a plurality of arcuate plate segments, and the outer edge includes an upper edge or a lower edge of the segment. A holding member that is inserted into the joint recess and holds the scaffold board is provided at a position opposite to the joint recess for connecting the segments provided in the cylindrical wall in a radial direction. This eliminates the need to manually build scaffolding at high places, increasing safety and efficiency. In addition, the sliding and locking mechanisms allow for quick and reliable installation and removal.
Provides stable footing. In addition, it is easy to move up and down, and it is also easy to carry it out when it gets in the way of other work. Since the joint recess originally provided in the segment is used, there is no need to create a new locking location, and since it is held only by the cylindrical wall, there is no possibility of instability even if the wall sinks. It has excellent effects such as no

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the main parts, Fig. 3 is a view taken in the direction of - arrow in Fig. 2, and Fig. 4 is a lock mechanism. FIG. 5 is a schematic cross-sectional view showing an example of use, and FIG. 6 is a perspective view of a concrete segment. DESCRIPTION OF SYMBOLS 1... Scaffold board, 2... Cylindrical wall, 3... Outer edge, 11... Joint recess, 12... Concrete segment, 16... Holding member.

Claims (1)

[Scope of utility model registration request] A scaffold board 1 is provided with an annular outer edge portion 3 that fits into the inner surface of a cylindrical wall body 2 formed by connecting a plurality of arcuate plate-like segments 12, and the outer edge portion 3 includes an upper edge of the segment 12 or A holding member 16 that is inserted into the joint recess 11 and holds the scaffold board 1 is inserted in the joint recess 11 at a position facing the joint recess 11 for connecting the segments 12 provided on the lower edge in the radial direction of the cylindrical wall body 2. A scaffolding device characterized by being slidably provided.