JPS6348553Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is made of alkali-resistant glass fiber-containing reinforced concrete (hereinafter referred to as GRC) for the rim frame and lid body used for inspection openings of underground water tanks, etc., and has load-bearing characteristics. The present invention relates to an inspection port unit configured as follows.

Conventional inspection port units are made of steel for both the frame and the lid, or the lid is made of a concrete plate with a steel edging. There is a risk of rusting and corrosion, and
They are heavy and expensive, and in order to increase the load-bearing properties of concrete, it is usually necessary to increase the thickness of the concrete layer until it reaches the intended load capacity, and to install necessary reinforcing bars. , since it is used frequently, there is a strong tendency for the wall thickness to be large compared to the load-bearing capacity, resulting in problems such as increased weight making it difficult to handle during installation and when opening and closing the lid. It was hot.

The GRC inspection port unit according to the present invention solves the problems of conventional inspection port units, and provides an inspection port unit that is lightweight, easy to handle, and has excellent load-bearing characteristics. The lid is made of concrete mixed with alkali-resistant glass fiber short fibers, the lid body is made thin to have the desired load-bearing characteristics, and then the characteristics of this GRC are effectively utilized to construct thin reinforcing ribs.
This supplements the load-bearing characteristics of the lid and effectively prevents deformation such as warping.

In particular, the GRC inspection port unit according to the present invention is constructed so that short glass fibers are mixed throughout both the edge frame and the lid, which improves strength, especially impact resistance. It is possible to provide a GRC inspection port unit that is free of cracks, chips, etc., and the gist of this is that the frame of the inspection port and the lid that can be freely attached to and detached from the frame are made of reinforced concrete containing alkali-resistant glass fibers. At the same time,
The back surface of the lid body is integrally provided with continuous ribs in the shape of a hexagonal mesh, and the raised cross section of the ribs is configured in a trapezoidal shape. Considerable design changes were planned.

A typical embodiment of the GRC inspection port unit according to the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 is the frame of the rectangular inspection port, and 2 is the removable lid of the frame 1, both of which are made of GRC material, and are made of alkali-resistant glass fiber and alkali-resistant glass fiber for the formwork of each shape. It is integrally molded by spraying with mortar, and a considerable amount of alkali-resistant glass fiber short fibers are uniformly mixed in all parts to ensure impact resistance and load-bearing properties in each part. It is something. The edge frame 1 is provided with a step portion 1a on the inner wall surface of which the peripheral edge 2'b of the back surface 2b of the lid body 2 is locked.
The stepped portion 1a holds its surface 2a at the same height as the upper surface 1b of the edge frame 1 and is locked therein, and a horizontal groove 1c is bored in the outer wall surface. By engaging the groove 1c with the horizontal protrusion 3b protruding from the end surface 3a of the opening/closing part of the floor slab 3, the edge frame 1 has its upper surface 1c flush with the upper surface 3c of the floor slab 3. It is configured to be held and mounted at a certain height.

The lid body 2 has a honeycomb structure with continuous ribs 2c arranged in a regular hexagonal mesh on the back surface 2b, and the ribs 2c are arranged on the circumferential side as a peripheral edge 2'b. Reference numeral 4 denotes a handle for supporting when the lid body 2 is engaged or detached.

Therefore, the rib 2c has a trapezoidal cross section, and the wall thickness L at the top end is narrower than the wall thickness L at the rising bottom, so that the rib 2c has a trapezoidal cross section, and the wall thickness l at the top end is narrower than the wall thickness L at the lower part of the rising edge. It has an effective shape.

That is, the external pressure applied to the lid body 2 is received while being dispersed in the direction along the inclined surface of the rib 2c, and the applied external pressure is rapidly attenuated. A reinforcing effect was observed.

Further, by forming the honeycomb structure in which the ribs 2c are arranged in a mesh pattern, the external pressure applied to the lid 2 is dispersed and supported in a planar direction with respect to the lid 2, and is also rapidly attenuated. That is, the ribs 2c in the lid body 2 have a trapezoidal cross section and a honeycomb structure, so that the load bearing capacity is extremely increased and the impact resistance properties are particularly good.

Due to these structural characteristics, the lid body 2 has approximately the same strength characteristics as the lid body 2, which has a wall thickness equivalent to H, which is supplemented with a thickness equivalent to h, compared to its wall thickness. , it is possible to provide a lightweight lid body 2 having the desired strength.

The GRC inspection port unit according to the present invention has the above-mentioned characteristic configuration, functions, and effects, and is lightweight and easy to handle, and the inspection port can be formed into round, square, rectangular, or other shapes. Since the ribs on the lid always act as reinforcing edges, the lid has excellent features such as sufficient load resistance and impact resistance, and low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the installed state of an embodiment of the GRC inspection port unit according to the present invention, Fig. 2 is a perspective view of the embodiment, Fig. 3 is a perspective view of the back side of the lid, and Fig. 4 is the same. The plan view of the back side and FIG. 5 are the same cross sections. 1... Edge frame, 2... Lid body, 2b... Back side, 2c
...Rib, 3...Floor slab.

Claims (1)

[Scope of utility model registration request] The edge frame and the lid body which can be freely engaged and detached from the frame are made of reinforced concrete containing alkali-resistant glass fibers, and the back side of the lid body is integrally provided with continuous ribs in a hexagonal mesh shape, and the ribs are A GRC inspection port unit characterized by having a trapezoidal rising cross section.