CN2288212Y

CN2288212Y - Changeable steel fibre concrete manhole cover

Info

Publication number: CN2288212Y
Application number: CN 97202338
Authority: CN
Inventors: 徐蕴贤; 侯文葳; 许乃武; 刘建亮; 吕贤良
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-07
Filing date: 1997-03-07
Publication date: 1998-08-19
Anticipated expiration: 2007-03-07

Abstract

The utility model discloses a changeable steel fibre concrete manhole cover which relates to the special equipment for railways and municipal administrations. The utility model is characterized in that the utility model is formed by casting steel fibre concrete into a mould which is matched with common force bearing ribs through vibration, and is formed by steam curing. The end parts of the steel ribs are welded with iron cushion plates to improve the force bearing state. The mixed quantity of the steel fibre in the concrete is 80 kg/m<3>. The external form of the steel fibre is in a sheared rectangular section, and the length of the steel fibre is 15 mm to 25 mm. The utility model can reach to the intensity requirements of steam 15. The price of the utility model is cheaper than that of the existing cast iron manhole cover, and the utility model is not easy to lose. The intensity of the utility model is close to that of the existing steel fibre concrete manhole covers with other types. The utility model has the advantages of strong changeable performance, cheap price and convenient construction.

Description

Changeable steel fibrous concrete well lid

The utility model relates to a kind of railway and municipal special equipment, is specially adapted to the multiple pipeline of rail yard and hinge, and the well head of pipe manholes such as upper and lower water, telecommunications, electric power, heating power, coal gas, fire-fighting is for administrative staff check and the usefulness of keeping in repair discrepancy.

Existing well lid removes that its shape is square except that having, the shape of garden, its material is based on cast iron, other also arranged with ordinary reinforced concrete, the back is a kind of owing to its intensity can't satisfy instructions for use, so less popularization.Thereby casting iron well lid is also caused casualties, consequently brings very big society and economic loss because of stealing repeatly to lose.This well lid biggest advantage is, can tear down and reconstruct bearing after original well lid is lost, and directly changes this well lid, can make easy construction, safety.

The purpose of the utility model steel fibrous concrete well lid is that the problem that overcomes existing ordinary concrete well lid existence provides a kind of high tensile, shearing resistance, the steel fibrous concrete of shock resistance and antifatigue is as the raw material of well lid, adopt the principal rod of configuration plain bars as well lid, intact when being subjected to local assault power in order to guarantee the edge steel fibrous concrete, the place strengthens with iron plate at the principal rod two ends, so just can reach under the situation that existing well lid is lost, need not change original walling crib, on former walling crib, adopt changeable steel fibrous concrete well lid, on structural strength, can satisfy the requirement of use through test.

The technical scheme of the changeable steel fibrous concrete well lid of the utility model is achieved in that changeable steel fibrous concrete well lid is the reinforced concrete member of fluid concrete in the steel bar stress net, it is characterized in that the steel bar stress net is to intersect to form arc mutually by the vaulted screw thread steel bar stress that K bar two ends are welded with iron chair, the steel ring of its periphery and circle is welded into rack and the end iron chair forms overall stressed system, and cast is mixed with the concrete of steel fibre in rack.

The volume of steel fibre is 80kg/mm ³, the external form of drill rod dimension adopts the scissor rectangle cross section, and length is 15～25mm.

The sand factor of steel fibrous concrete is 50%.

The utility model is compared with existing ordinary reinforced concrete well lid, having that advantages of high strength compares with other types steel fibrous concrete well lid is can tear down and reconstruct rest directly to change advantages such as simple installation, safety, low price after casting iron well lid is lost.Now describe in detail in conjunction with the accompanying drawings most preferred embodiment of the present utility model: Fig. 1 for changeable steel fibrous concrete well lid lateral view Fig. 2 for for changeable steel fibrous concrete well lid vertical view Fig. 3 for mixing in the concrete among the steel fibre schematic diagram figure: 1. principal rod 2. steel fibrous concretes 3. iron chairs 4. round steel ring a kind of changeable steel fibrous concrete well lid of 5. drop handle holes, 6. rests, 7. steel fibres such as Fig. 1. shown in Figure 2, it be a kind of in the steel bar stress net reinforced concrete member of fluid concrete: adopt the principal rod 1 of K root configuration regular screw threads reinforcing bar as well lid, intact when being subjected to local assault power in order to guarantee the edge steel fibrous concrete, being welded with iron chair 3 at the place, force side strengthens, so just can reach under the situation that the well lid of existing manhole is lost, need not change original rest 6, on original rest 6, adopt changeable steel fibrous concrete well lid, on structural strength, can satisfy instructions for use through test. this K root bead has the arc screw thread steel bar stress 1 of iron chair to intersect to form arc its periphery in garden and 4 welding of garden shape steel ring mutually, form a complete steel mesh reinforcement, cast steel fibrous concrete 2 and vibration moulding in being furnished with the model of steel mesh reinforcement then, make changeable steel fibrous concrete well lid through steam curing, be provided with drop handle hole 5 for ease of being open at the well lid bilateral, steel fibre 7 volume in concrete is 80kg/m ³, steel fibre 7 external forms are illustrated in figure 3 as the scissor rectangle cross section, and length is 15～25mm.The sand factor of steel fibrous concrete is 50%.

The changeable steel fibrous concrete well lid of the utility model can reach the requirement of a heavy bearing capacity of vapour-15, under 2,000,000 Fatigue Load, the steel fibrous concrete of not finding the periphery supporting face has the rhegma phenomenon, can use in railway terminal, stand field and other urban constructions certainly, its intensity can satisfy instructions for use.Lower than existing casting iron well lid valency, be difficult for losing, than existing other type ordinary concrete well lid intensity height, commutativity is strong, easy construction.

Claims

1. reinforced concrete member that changeable steel fibrous concrete well lid is a fluid concrete in the steel bar stress net, it is characterized in that the steel bar stress net is to intersect to form arc mutually by the vaulted screw thread steel bar stress that K bar two ends are welded with iron chair, the steel ring of its periphery and circle is welded into rack and the end iron chair forms overall stressed system, and cast is mixed with the concrete of steel fibre in rack.

2. according to the described steel fibrous concrete well lid of claim 1, the volume that it is characterized in that steel fibre is 80kg/m ³

3. according to the described steel fibrous concrete well lid of claim 1.2, the external form that it is characterized in that steel fibre is the scissor rectangle cross section, and length is 15～25mm.

4. steel fibrous concrete well lid according to claim 1 is characterized in that the well lid bilateral is provided with the drop handle hole.

5. steel fibrous concrete well lid according to claim 1 is characterized in that iron chair is welded in the end of steel bar stress.