CN2232455Y

CN2232455Y - Prestressed sewer shaft cover

Info

Publication number: CN2232455Y
Application number: CN 94243763
Authority: CN
Inventors: 姜福祥; 李相民
Original assignee: QINGZHOU CASTING MATERIAL CO Ltd HEBEI PROV
Current assignee: QINGZHOU CASTING MATERIAL CO Ltd HEBEI PROV
Priority date: 1994-11-11
Filing date: 1994-11-11
Publication date: 1996-08-07
Anticipated expiration: 2004-11-11

Abstract

The utility model relates to the improvement on a manhole cover with an iron skeleton concrete structure. An upswept arch structure is designed in the central part of the lower plane of the manhole cover, and the structure is a prestressed arch structure which is a round, an ellipse, a trapezoid or other shapes. The structure can bear bigger impact load and vertical heavy pressure, thus avoiding damage, saving materials, and reducing deadweight, and the utility model is a significant improvement.

Description

Prestressing force sewer well lid

The utility model belongs to a kind of sewer isolated plant.Specifically be applied to the new pattern manhole cover of sewer sewage well, observation well, catch pit, particularly be applied to be arranged on the road of traffick, the occasion in the middle of the place.

The well lid of cast iron skeleton filling concrete formation is the well lid new construction that grew up in recent years.Be beautifying urban environment, the expert also specialized designs the cast iron skeleton concrete manhole cover of terrazzo facing, be subjected to the welcome of urban construction department deeply.Yet, when the position of well lid on road, or some specific place be the weight of wheel might occur the time, as the relatively poor phenomenon of rupture that easily produces when the heavy burden of plain cast iron skeleton well lid withstand shock load-bearing capacity.Common grid type skeleton of evenly arranging bears vertical pressure and is easy to generate crooked deformation from middle position, and the stress at position is concentrated in the formation, finally causes the well lid breakage.And because the setting of skeleton strengthens the overall weight of well lid also is one of scarce limit of existing product.

The purpose of this utility model is to provide a kind of structure design of prestressing force sewer well lid, to strengthen the ability of iron skeleton concrete manhole cover anti-shock loading, reduces well lid weight.On the basis of the whole advantages that keep terrazzo concrete face iron skeleton well lid, further improve its supporting capacity, reduce damaged and reduce cost.

Crucial design of the present utility model is prestressing force bow-shaped structural that cast iron skeleton baseplane core is designed to be bent upwards.This equals the bottom surface arch camber, make whole cast iron skeleton be the pre-stressed state that is bent upwards, when the pressure that is subjected to vertically downward, gravity is arc to well lid edge dispersion formation horizontal direction component through bending, because the well lid periphery directly is located on the well head circle, has so just disperseed pressure at right angle, the bent intermediate moment of having avoided pressure to form is too concentrated, thereby the well lid load-bearing capacity that withstands shocks is improved greatly, but also saved raw material, directly reduced deadweight.

Following structure accompanying drawing further specifies the purpose of this utility model and how to realize.

Fig. 1 is the schematic appearance of profile rectangle sewer well lid.

Fig. 2 is that A '-A ' of Fig. 1 is to cut-away view.

Fig. 3 is that the A '-A ' in trapezium structure when design of Fig. 1 is to sectional view.

Fig. 4 is that B '-B ' of Fig. 1 is to sectional view.

Fig. 5 is a garden shape outward appearance sewer well lid vertical view.

Fig. 6 is that C '-C ' of Fig. 5 is to sectional view.

Fig. 7 is the well lid arrangement diagram on the continuous drainage road.

Fig. 8 is not for there being the observation well lid schematic diagram in infiltration hole.

Wherein 1 for being distributed on drain hole on the well lid, and 2 is the cast iron skeleton, and 3 is the concrete inserts, 4 is bow-shaped structural, 4a is garden or oblong bow structure, and 4b is a trapezium structure, and 4c is a ladder-type structure, 4d is an ellipsoidal structure, 5 for being preset at steel bars in concrete, and 6 is sewer well head circle, and A is sewer well lid baseplane, B is last plane, and H is bow-shaped structural summit and last plan range.

From given embodiment accompanying drawing as can be seen, key technology of the present utility model is the bow-shaped structural 4 that changes a bending on the design basis of original iron skeleton well lid at the core of baseplane A into.The bow-shaped structural that Fig. 2 showed is that the cross section becomes circular arc 4a shape or ellipse arc 4d, and the bow-shaped structural cross section that Fig. 3 showed is trapezoidal 4b, also can be designed to stairstepping (seeing Fig. 3 dotted portion 4C).Also can be designed to the smoothed curve shape of hyperbola arch or other even transition in addition according to the concrete use occasion of sewer well lid.Above structure is its principle of utilizing arched edge to disperse when bearing heavy duty, the vertical stressed horizontal component that is converted into, strengthen the counter-bending ability in well lid centre greatly, because the pulling force of horizontal direction strengthens, in design, can consider in concrete fill, to preset upper stress reinforcing bar 5, with anti-horizontal pull, particularly be arranged in the middle of the highway, the well lid at edge should add prestressed reinforcement.

External shape as for the sewer well lid can be made square, rectangle, pentagon, regular hexagon, octagon, semilune or ellipse.Main specific requirement coordinate design according to landscaping.Key is to be positioned at the reinforcement that bow-shaped structural 4 that the centre, baseplane is bent upwards causes the resisting breakage ability.The distance H between the B of plane should be less than 1/2 of well lid thickness, to guarantee the flexural strength of central part on the iron skeleton to be bent upwards arc summit.

Accompanying drawing gives the application example of sewer well lid, comprising the observation well lid (Fig. 8) of well lid (Fig. 7) on the both sides of highway continuous drainage road and no drain hole.

By the designed prestressing force sewer well lid of above design, its withstand shocks load or heavy duty can force rate former design have significantly and improve, and save material 10-15%, deadweight reduces product greatly, cost also obviously descends, and is the once useful improvement to the sewer well lid of iron skeleton concrete structure.

Claims

1, a kind of sewer well lid is made up of cast iron skeleton (2) and concrete inserts (3), is the garden shape or the polygon of the uniform drain hole in centre (1), it is characterized in that cast iron skeleton (1) baseplane A core is the prestressing force bow-shaped structural that is bent upwards.

2,, it is characterized in that the bow-shaped structural cross section that cast iron skeleton (2) baseplane A core is bent upwards is garden arc (4a) or elliptic arc (4b) shape according to the said sewer well lid of claim 1.

3,, it is characterized in that the bow-shaped structural cross section that cast iron skeleton (2) baseplane A core is bent upwards is trapezoidal (4b) or stairstepping (4C) according to the said sewer well lid of claim 1.

4,, it is characterized in that the bow-shaped structural cross section that cast iron skeleton (2) baseplane A core is bent upwards is the smoothed curve shape of hyperbola arch or even transition according to the said sewer well lid of claim 1.

5,, it is characterized in that the sewer well lid specifically can be made into square, rectangle, pentagon, regular hexagon or octagon, also can be made into semilune and ellipse according to the said sewer well lid of claim 1.

6, according to the said sewer well lid of claim 1, it is characterized in that cast iron skeleton (2) baseplane A core be bent upwards arc summit on the iron skeleton distance H between the B of plane less than 1/2 of well lid thickness.

7,, it is characterized in that the level that is provided with is to the prestressed reinforcement of placing (5) in concrete inserts (3) according to the said sewer well lid of claim 1.