Safety municipal rainwater and sewage pipe inspection manhole cover

Abstract

The original purpose of the proposed technology was to prevent pedestrians from falling into and drowning in stormwater and sewage manholes. The safe municipal stormwater and sewage manhole cover is an improvement on existing municipal drainage manhole cover technology. It prevents the manhole cover from being swept away when water flow in municipal stormwater and sewage pipes exceeds the certified flow rate. Even in the worst-case scenario, the proposed technology can still ensure a 72% coverage rate for the manhole opening, thus preventing pedestrians from falling into the manhole.

Description

Technical Field

[0001] Inspection manhole cover. Background Art

[0002] Single-layer cement concrete inspection well cover for municipal rainwater and sewage pipes. Summary of the Invention

[0003] The original intention of designing the applied technology is to prevent pedestrians from falling into rainwater and sewage inspection wells and drowning.

[0004] The use of the applied technical manhole cover can prevent the municipal rainwater and sewage pipe inspection manhole cover from being washed away when the rainwater and sewage flow exceeds the check flow, thereby ensuring that pedestrians will not fall into the inspection well due to the manhole cover being washed away.

[0005] When the manhole cover of an inspection well using the applied technology is washed away, it can still ensure that the manhole cover covers more than 72% of the wellhead area, that is, the wellhead area coverage rate is 72% under the most unfavorable circumstances.

[0006] See the attached picture of the effect when the technical manhole cover is normally closed. Figure 1 , the effect diagram when the manhole cover is fully opened normally is attached Figure 2 , the effect diagram under the most unfavorable conditions is attached Figure 3 .

[0007] See the attached drawing for the plan of the manhole cover when it is normally closed. Figure 4 , the most unfavorable situation is shown in the attached plan Figure 5 , the most unfavorable situation plan is attached Figure 6 .

[0008] The technology under application can be used for cement concrete manhole covers. The dimensions in the attached drawings are based on a 700mm diameter manhole cover as an example. The technology under application can be used for, but is not limited to, manhole covers with a diameter of 700mm.

[0009] Technical Structure Overview: Two cables are used to tie the manhole cover and the manhole base together. Small sleeves are installed on the manhole cover and the manhole base to secure the cables.

[0010] Description of the technical structure of the application: The technology applied for is to improve the existing cement concrete manhole cover and manhole seat structure (the existing technical structure is shown in the attached Figure 7 ). The improvements are as follows:

[0011] 1. Install a steel ring on the outermost edge of the cement concrete manhole cover and the manhole seat respectively.

[0012] The installation style has been applied in the existing technology center. See the attached steel ring position. Figure 8 、 9 ;

[0013] 2. Weld two small sleeves on the inner side of the steel rings installed on the manhole cover and the manhole seat.

[0014] The small casing is connected to the manhole cover and the manhole seat by welding. After the small casing is welded, it is filled with cement concrete.

[0015] See the attached picture for the effect of installing a small casing on the outside of the manhole cover. Figures 10-12 ;

[0016] See attached for the effect diagram of the steel ring with small casing installed on the outside of the well seat. Figures 13-15 ;

[0017] 3. Determine the position of the small casing.

[0018] To determine the position of the small casing, it is necessary to first determine the position of the small casing on the well seat, and then determine the position of the small casing on the well cover.

[0019] (1) The location of the small casing in the well seat is shown in the attached Figure 13 、 16 .

[0020] Attachment Figure 16 Point A is the center of the small casing on the well seat.

[0021] The location of point A is determined by two constraints.

[0022] 1) The small casing of the well seat is inscribed on the outermost edge line of the well seat;

[0023] 2) The center A of the small casing on the well seat and the surrounding Figure 16 The dotted line intersects the well seat edge line (attached Figure 16 Tangent to the circle (thick solid line).

[0024] By satisfying the above two constraints, we can determine the spacing of the small casings on the well seat. Furthermore, since the well seat is circular, as long as the spacing is fixed, we can determine the position of another small casing on the well seat.

[0025] (2) The location of the small casing of the manhole cover is shown in the attached Figure 10 、 16 .

[0026] Attachment Figure 16 Point B is the center of the small casing on the manhole cover.

[0027] The positioning of point B is also determined by two constraints.

[0028] 1) The small casing of the manhole cover is inscribed on the outermost edge line of the manhole cover;

[0029] 2) The line connecting the center B of the small casing on the manhole cover and the center A of the small casing on the well seat is perpendicular to the line connecting the center points of the two small casings on the well seat, that is, BA is perpendicular to AC.

[0030] The method for determining the center positions of the two small casings on the manhole cover is the same.

[0031] 4. Use two cables to pass through the added small casing to tie the well seat and the manhole cover together, and place the cable section on the back of the manhole cover.

[0032] 5. Two straight grooves are reserved on the surface of the well seat and the well cover where the cables are connected to place the two additional cables.

[0033] Prevent the cable from excessive wear due to it exceeding the manhole cover plane. Figure 17 .

[0034] The groove depth and width should be greater than the cable diameter, preferably 1.2 times the cable diameter.

[0035] 6. Cable length is an important factor in ensuring wellhead area coverage.

[0036] The length of the cable is: when the manhole cover is fully opened normally, the cable will not be loose.

[0037] If the cable is too short, the manhole cover cannot be fully opened normally.

[0038] See the attached picture for the effect when the manhole cover is fully opened normally. Figure 2 .

Claims

1. A safe municipal rainwater and sewage pipe inspection manhole cover, characterized by: The manhole cover is connected to one end of the manhole seat with a cable; A steel ring is installed on the outermost edge of the cement concrete manhole cover and the manhole seat, and two small sleeves are welded inside the steel rings installed on the manhole cover and the manhole seat respectively. After the sleeves are welded, cement concrete is filled in. The small casing of the well seat is inscribed on the outermost edge line of the well seat, the line connecting the centers of the two small casings on the well seat is a tangent to the edge line of the well cover, the small casing of the well cover is inscribed on the outermost edge line of the well cover, and the line connecting the centers of the small casing on the well cover and the small casing of the well seat is perpendicular to the line connecting the centers of the two small casings on the well seat; Use two cables to pass through the small casing on the manhole cover and the small casing on the well seat adjacent to the small casing, and tie the well seat and the manhole cover together; Two straight grooves are reserved on the surface of the well seat and the well cover where the cables are connected for placing the two cables.

Images