JPS5816047B2 - Manhole lining lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining the inner wall of a manhole, and more particularly to a method for lining a manhole with a focus on corrosion resistance.

Manholes are generally made of concrete poured concrete, or the inner walls of the concrete structure are coated with anti-corrosion coatings, but the inner walls of these manholes are coated with various chemicals that have diversified with the recent development of the chemical industry. It was not possible to sufficiently deal with corrosive effects, and there were problems in terms of durability.

Therefore, in order to improve this problem, there is a construction method in which the walls inside the concrete structure of the manhole are adhesively lined with a synthetic resin sheet that has corrosion resistance, or a corrosion-resistant material is lined with the tips of a large number of loose bolts that are buried in the concrete structure in advance. A method has been proposed in which the sheet is made to protrude from a group of through-holes drilled in a synthetic resin sheet having a cylindrical structure, and the sheet is attached to a wall surface within a concrete body by tightening the bolts using the bolts.

However, in the former case, the sheet peels off over time, and in the latter case, water seepage from the bolt insertion hole is common.Furthermore, both of these construction methods are difficult to install. The lining work cannot be performed until the concrete has completely solidified, which naturally lengthens the construction period, and the lining work requires time and skill.

This invention involves forming in advance an inner tank made of a synthetic resin with excellent corrosion resistance that forms a lining layer on the inner wall surface of a concrete frame in a manhole, and connecting the inner tank with a large number of anchor bolts extending outward over the entire outer peripheral surface. The reinforcing bars arranged and protruded are assembled and installed inside the foil-like reinforcing body, and both are fixed with appropriate fixing tools to form an inner frame.

, This foil reinforcement serves as a shape-retaining frame for the inner tank.
In addition, it can act as reinforcement for the concrete poured around its outer periphery.

The inner frame consisting of the above structure is installed on the foundation that has been poured in advance at the bottom of the excavation hole, and concrete is poured between the outer frame installed in the excavation hole and this inner frame. , a concrete manhole is completed, and a lining layer is formed directly on the inner wall of the manhole using the inner tank that forms part of the inner frame.In other words, the lining layer of the manhole is formed in synchronization with the concrete pouring work. At the very least, it is intended to simplify the lining work and shorten the construction period.

Next, a specific example of the lining construction method of the present invention will be described with reference to the drawings.

In the figure, 1 is an inner tank made of synthetic resin with excellent corrosion resistance and chemical resistance, such as vinyl chloride or polyethylene, and has a diameter that matches the diameter of the manhole, and an inflow pipe for draining water at the bottom of the side wall. Then, piping openings 2 and 3 of the outflow pipe are opened, and a flange 4 is formed on the outer periphery of the toe.

6 is assembled by welding the intersections of 7 groups of vertical reinforcing bars, 8 groups of circumferential reinforcing bars, and 9 groups of reinforcing bars at the bottom, and the pol N located on the entire outer circumferential surface including the bottom, especially at the top.
Oa is a foil reinforcement in which a large number of ten groups of anchor bolts are protruded obliquely downward for the purpose of deepening the burial depth with the concrete drive, and the inner tank 1 is internalized,
Both legs 1.6 hold the reinforcing bars using appropriate fixtures 11 scattered over the entire contact surface, for example, angle-shaped members of the same quality as those of the same type 1, and glue both legs 12, 12 to the open surface of the inner tank. The inner frame body 13 is formed by firmly closing and fixing the whole body using a fixing tool.

The inner frame body 13 having the above structure can be used as the inner frame itself for concrete pouring when forming a concrete manhole, and the openings 2 and 3 of the inner tank 1 of the inner frame body 13 are pre-filled with resistance resistance. An inflow pipe 14 and an outflow pipe 15 made of synthetic resin with excellent properties are connected, and concrete base foundations 16, 16' are cast at the bottom of the trench.
The solidified inner frame 13 is placed on the foundations 16 and 16', and the inner frame 13 in the trench is expanded with the outer frame 19 as before, and the inner frame 13 and the outer frame 19 are formed. ■ Concrete casting work is carried out in the gap where the anchor bolts 10 protruding from the outer circumferential surface of the inner frame body 13 are removed from the concrete ring body 17.
A lining layer is formed on the inner wall surface of the concrete storage body 17, which is buried and hardened, with the inner tank 1 constituting a part of the inner frame body 13, at the same time as concrete is poured.

Reference numeral 20 indicates an upper body of the manhole which is placed and fixed on the solidified manhole cover 17 having the manhole cover 21 fitted to the top surface thereof.

According to the lining construction method of the present invention, the concrete storage body 1 after completion has the inner tank 1 forming the part of the inner frame body 13.
Since the lining layer covers the inner wall surface of No. 7, unlike the conventional lining method where the lining process cannot be performed as the next step until the concrete storage body has completely solidified, the concrete pouring work Since the lining layer is formed at the same time, the construction period can be shortened and work efficiency can be improved. Also, since the inner frame body 13 remains as part of the manhole, assembly of the inner frame is different from conventional construction methods. There is no need for demolition work, which reduces costs.Furthermore, since the inner tank, which acts as a lining layer, is firmly fixed to the concrete body with a large number of anchor bolts, it takes less time than the adhesive method described above. There was no peeling of the synthetic resin sheet from the concrete storage body, which occurs with the passage of time, and there was no water seepage from the bolt holes as in the loose bolt lining method. It has many remarkable effects, such as better protection against corrosion.

[Brief explanation of the drawing]

Figure 1 is a central longitudinal cross-sectional view of a manhole that has undergone this lining method, Figure 2 is a right side (inflow pipe installation side) view of the inner frame, and Figure 3 is an enlarged cross-sectional view taken along line A-A in Figure 2. FIG. 4 is an enlarged view of a portion of FIG. 1. In the figure, 1 is a synthetic resin inner tank, 6 is a foil reinforcement, 7° 8.9
10 is a reinforcing bar, 10 is an anchor bolt, 11 is a fixture, 13 is an inner frame body, 16 is a foundation, 17 is a concrete storage body, and 19 is an outer frame.

Claims (1)

[Claims] 1 An inner tank 1 made of synthetic resin with excellent corrosion resistance is installed inside the foil reinforcement 6 in which anchor poles 10 and 10 groups are protruded over the entire outer periphery of the reinforcing bars assembled in a foil shape. , both 6
．． 1 with the fixtures 11 and 11 group, and the inner frame body 13
The inner frame body 13 is placed on foundations 16 and 16' cast at the bottom of the drilling hole, and concrete is poured in the gap between the inner frame body 13 and the outer frame 19 surrounding it. A method for lining a manhole, characterized in that a lining layer is formed using the inner tank 1.