A special bracket for manhole cover in manhole and use method thereof

Abstract

The present invention provides a special bracket for manhole covers and a method for using the bracket, which belongs to the field of municipal facilities. The bracket includes: a manhole ring base; the manhole ring base includes: a cylindrical component and an annular component; the two ends of the cylindrical component are open, which are an upper open end and a lower open end respectively; the cylindrical component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the lower open end of the cylindrical component; the annular component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the outer edge of the annular component; the radius of the large circle of the annular component is the same as the diameter of the cylindrical component, and the outer edge of the annular component is fixedly connected to the lower open end of the cylindrical component; the opening of the slot on the cylindrical component is aligned with the opening of the slot on the annular component, and the two are connected to form an L-shaped slot. The present invention can be used on different manholes. The same inner manhole cover can be used, which reduces costs and does not affect access to the manhole.

Description

Technical Field

[0001] The invention belongs to the field of municipal facilities, and in particular relates to a special bracket for a manhole cover in a manhole and a use method thereof. Background Art

[0002] At present, the diameters of manholes on the road surface are of different sizes, and the inner manhole covers cannot be made according to the diameter of the manhole. The manholes are constructed on site, and the diameters of each manhole are different. Some are not even regular circles. It is impossible to make inner manhole covers suitable for each manhole according to the size of each manhole. Therefore, all inner manhole covers are of uniform size, but when inner manhole covers of uniform size are used for manholes of different sizes, the following situations may occur: 1. When the size of the inner manhole cover is larger than the diameter of the manhole, the inner manhole cover cannot enter the manhole and cannot be installed; 2. When the size of the inner manhole cover is smaller than the diameter of the manhole, it is necessary to first install a bracket on the inner wall of the manhole, and then install the inner manhole cover on the bracket.

[0003] The diameter of the existing inner manhole cover corresponds to the caliber of the existing smallest manhole specification. Therefore, a special bracket for the inner manhole cover is required so that the inner manhole cover of the same caliber can be applied to all manholes larger than this caliber. However, the existing bracket has the following problems: if the bracket is too short, the inner manhole cover has poor compatibility with different manhole calibers; if the bracket is too long, it itself is easy to form an obstacle to the entrance and exit of the manhole, affecting the construction personnel's entry and exit of the manhole. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a special bracket for manhole inner cover and a method of using the same. By adjusting the folding angle, the existing inner manhole cover can be adapted to manholes of different sizes without affecting the construction personnel entering and exiting the manhole.

[0005] The present invention is achieved through the following technical solutions:

[0006] A special bracket for a manhole cover in a manhole, comprising: a manhole ring base; the manhole ring base comprises: a cylindrical component and an annular component;

[0007] The cylindrical component has two openings at both ends, namely an upper opening end and a lower opening end; the cylindrical component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the lower opening end of the cylindrical component;

[0008] The annular component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the outer edge of the annular component;

[0009] The radius of the large circle of the annular component is the same as the diameter of the cylindrical component, and the outer edge of the annular component is fixedly connected to the lower open end of the cylindrical component; the opening of the slot on the cylindrical component is aligned with the opening of the slot on the annular component, and the two are connected to form an L-shaped slot.

[0010] The plane where the lower open end of the cylindrical component is located is parallel to the plane where the annular component is located; the plane where the annular component is located is perpendicular to the central axis of the cylindrical component;

[0011] Each slot on the cylindrical component is a U-shaped slot, and the height direction of the U-shaped slot is parallel to the central axis of the cylindrical component;

[0012] The width of the U-shaped slot matches the diameter of the fixing screw installed on the well wall;

[0013] Each slot on the annular component is a square slot, and the height direction of each square slot is located on the same straight line as a radius direction of the annular component;

[0014] The hole width of the square slot hole is the same as the hole width of the U-shaped slot hole, and the hole height of the square slot hole matches the length of the fixing screw installed on the well wall.

[0015] The annular component is provided with arc-shaped slots evenly distributed on the circumference;

[0016] The special bracket for the manhole cover in the manhole includes a tripod, and the tripod can be connected to the manhole ring base by fixing screws;

[0017] Each of the arc-shaped slots is concentric with the annular component, and the axis of the arc-shaped slots is located on the middle circumference of the annular component. The middle circumference is a circle, and its radius is (small circle radius of the annular component + large circle radius of the annular component) / 2;

[0018] The width of the arc-shaped slot matches the diameter of the fixing screws connecting the well ring base and the tripod;

[0019] The arc-shaped slots and the square slots are alternately arranged at equal intervals on the circumference;

[0020] The number of the U-shaped slots, arc-shaped slots, and square slots are the same;

[0021] The center of each arc-shaped slot hole is located at the center of the line connecting the two square slot holes on its two sides, and the length of the hole is equal to 1 / 4 of the length of the arc sandwiched by the two square slot holes on its two sides.

[0022] The tripod comprises a tripod head and a tripod tail;

[0023] The tripod head comprises a first connecting portion, a body and a second connecting portion which are connected as one body, and all of the three are planar structures; the first connecting portion and the second connecting portion are parallel and perpendicular to the body and are located on the same side of the body; and circular holes are opened on the first connecting portion and the second connecting portion;

[0024] The tail portion of the tripod includes a bottom surface, a side surface, an upper connecting surface, and a lower connecting surface that are connected together. The bottom surface and the side surface are vertically connected. The upper connecting surface and the lower connecting surface are parallel and perpendicular to the bottom surface and the side surface. The upper connecting surface, the lower connecting surface, and the side surface are all located on the same side of the bottom surface. One side of the upper connecting surface is connected to the upper end of the bottom surface, and the other side is connected to the upper end of the side surface. One side of the lower connecting surface is connected to the lower end of the bottom surface, and the other side is connected to the lower end of the side surface. Circular holes are opened on the upper connecting surface and the lower connecting surface.

[0025] The first connecting portion is located below the upper connecting surface, and the two can be movably connected by screws installed at the circular hole; the second connecting portion is located above the lower connecting surface, and the two can be movably connected by screws installed at the circular hole. The angle formed by the main body and the bottom surface is the folded angle of the tripod, and the folded angle is 0 to 90 degrees.

[0026] Preferably, the shape of the body is a right-angled trapezoid, comprising a lower base, a right-angled waist, an upper base and an oblique waist connected in sequence, the upper base and the lower base are parallel, the right-angled waist is perpendicular to the upper base and the lower base, the oblique waist intersects with the lower base to form an acute angle, and the acute angle at the intersection of the lower base and the oblique waist of the right-angled trapezoid is cut off to form a short side parallel to the right-angled waist;

[0027] The first connecting portion comprises a first quarter circular surface, a first rectangular surface and a half circular surface which are connected in sequence to form a long strip-shaped structure with arcs at both ends after the three are connected; the radius of the first quarter circular surface, the width of the first rectangular surface and the diameter of the half circular surface are the same; a radius of the first quarter circular surface, the long side of the first rectangular surface and the tangent direction of the half circular surface are located on the same straight line, wherein the radius of the first quarter circular surface and the long side of the first rectangular surface located on the same straight line constitute the connecting edge of the first connecting portion, and the connecting edge is fixedly connected to the right-angle waist of the body, the straight line where the lower base of the body is located is tangent to the outer edge of the first quarter circular surface, and the straight line where the upper base of the body is located and the diameter of the half circular surface are located on the same straight line; a circular hole is opened at the center position of the first quarter circular surface;

[0028] The second connecting portion comprises a second quarter circular surface and a second rectangular surface connected in sequence, the radius of the second quarter circular surface is the same as the width of the second rectangular surface, a radius of the second quarter circular surface and a long side of the second rectangular surface are located on the same straight line, and the two constitute a connecting edge of the second connecting portion, the connecting edge is fixedly connected to the short side on the body, and the length of the connecting edge is equal to the short side of the body; the other long side of the second rectangular surface is tangently connected to the outer edge of the second quarter circular surface; the straight line where the lower bottom of the body is located is tangent to the outer edge of the second quarter circular surface; the width direction of the second rectangular surface is parallel to the upper bottom and the lower bottom of the body; a circular hole is opened at the center of the second quarter circular surface;

[0029] The centers of the first quarter-circular surface and the second quarter-circular surface are located on the same straight line, and the radii of the two are equal; the centers of the circular holes on the first quarter-circular surface and the circular holes on the second quarter-circular surface are located on the same straight line;

[0030] A first oblong hole is formed on the first connecting portion, and a length direction of the first oblong hole is parallel to a connecting edge of the first connecting portion;

[0031] The width of the first oblong hole is equal to the width of the arc-shaped slot on the annular member, and the hole length is greater than or equal to the radius of the manhole diameter minus the radius of the large circle of the annular member plus half the width of the annular member, and the width of the annular member is equal to the large circle radius of the annular member minus the small circle radius;

[0032] The first oblong hole cooperates with the arc-shaped slot of the annular component, and the tripod head can be connected to the annular component after screws are inserted into the first oblong hole and the arc-shaped slot;

[0033] A second oblong hole is opened on the bottom surface, and the width of the second oblong hole matches the diameter of a fixing screw installed on the well wall.

[0034] Reinforcing ribs evenly distributed on the circumference are arranged between the cylindrical component and the annular component; the reinforcing ribs include two vertically connected sides, one of which is connected to the inner wall of the cylindrical component, and the other is connected to the end face of the annular component.

[0035] The method for using the special bracket for manhole cover in the manhole comprises:

[0036] (1) Determine whether the diameter of the manhole where the inner manhole cover is to be installed is close to the diameter of the large circle of the annular component. If so, proceed to step (2); if not, proceed to step (3);

[0037] (2) Install the manhole ring base directly in the manhole, and then proceed to step (4);

[0038] (3) Connect the tripod head to the tripod tail, and install the tripod tail on the wall of the manhole; install the well ring base on the tripod, and adjust the folding angle of each tripod by rotating the well ring base until all tripods are not located within the small circle of the annular component; then fix the well ring base to the tripod, fix the tripod head to the tripod tail, and then go to step (4);

[0039] (4) Install the inner manhole cover onto the upper open end of the cylindrical component.

[0040] The operation of determining whether the diameter of the manhole where the inner manhole cover is to be installed is close to the diameter of the large circle of the annular component in step (1) includes:

[0041] First, install the fixing screws on the wall of the manhole, and then lower the base of the manhole ring along the central axis of the manhole. If all the fixing screws on the wall can be exposed from the U-shaped slot holes of the cylindrical part, and the exposed length can be used to install the matching nuts, then it is determined that the diameter of the manhole is close to the diameter of the large circle of the annular part. If one or more fixing screws on the wall cannot be exposed from the U-shaped slot holes of the cylindrical part, or the exposed length of one or more fixing screws is not enough to install the matching nuts, then it is determined that the diameter of the manhole is not close to the diameter of the large circle of the annular part.

[0042] The operation of step (2) includes:

[0043] The manhole ring base is lowered along the central axis of the manhole, and the fixing screws fixed on the manhole wall pass through the square slots on the annular component and then enter the U-shaped slots on the cylindrical component;

[0044] Adjust the position of each fixing screw in the U-shaped slot hole so that the upper open end of the cylindrical component is located in the horizontal plane;

[0045] Tighten the nuts that come with each set screw.

[0046] The operation of connecting the tripod head to the tripod tail in step (3) includes:

[0047] The first connection part of the tripod head is brought close to the lower end surface of the upper connection surface of the tripod tail, and the round hole on the first connection part is aligned with the round hole on the upper connection surface, and then a screw is inserted. The screw passes through the round hole on the upper connection surface and the round hole on the first connection part in sequence, and then is screwed in from the upper end of the nut matched therewith. When the head of the screw is flush with the lower end surface of the nut, the relative position of the screw and the nut is fixed. At this time, the tripod head can rotate relative to the tripod tail, but the two cannot be separated, and the screw cannot be screwed out of the nut;

[0048] At the same time, bring the second connection part of the tripod head close to the upper end surface of the lower connection surface of the tripod tail, align the round hole on the second connection part with the round hole on the lower connection surface, and insert the screw. The screw passes through the round hole on the second connection part and the round hole on the lower connection surface in turn, and then screws into the matching nut without tightening.

[0049] The operation of installing the tail of the tripod onto the wall of the manhole in step (3) includes:

[0050] Insert the fixing screw on the wall of each manhole into the corresponding second oblong hole at the end of the tripod, screw the matching nut into the fixing screw, but do not tighten it;

[0051] The operation of installing the well ring base onto the tripod in step (3) includes:

[0052] Placing the well ring base on each tripod, and making the arc-shaped slots on the annular component correspond one to one with the first oblong holes on the tripod heads;

[0053] Pass the fixing screw through the arc-shaped slot on the annular component and the first oblong hole on the tripod head in sequence, and then screw it into the matching nut without tightening it;

[0054] Adjust the positions of the fixing screws installed on the well wall in the second oblong hole so that the upper opening end of the cylindrical component is located in the horizontal plane, and then tighten the nuts matched with the fixing screws;

[0055] The operations of fixing the well ring base to the tripod and fixing the tripod head to the tripod tail in step (3) include:

[0056] Tighten the nut matched with the screw that passes through the arc-shaped slot on the annular component and the first oblong hole on the tripod head in sequence;

[0057] Tighten the nut matched with the screw that passes through the circular hole on the second connecting part and the circular hole on the lower connecting surface in sequence.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. Faced with manholes of different sizes on the market, it is only necessary to produce inner manhole covers of one specification, whose diameter corresponds to the existing smallest manhole diameter, and there is no need to produce inner manhole covers of multiple specifications.

[0060] 2. Faced with manholes of different diameters on the market, only one specification of manhole ring base and tripod needs to be produced, and its specifications correspond to the inner manhole cover. There is no need to produce multiple specifications, which greatly reduces the cost; different manhole diameters only correspond to different folding angles of the tripod, and the corresponding relationship between the cylindrical component and the inner manhole cover remains unchanged, and the combination is tight, which is convenient for realizing various opening and closing functions of the two.

[0061] 3. When the diameter of the manhole is close to the outer diameter of the manhole ring base, there is no need to use a tripod. In this case, the manhole entrance and exit are unobstructed.

[0062] 4. When used for manholes with the largest diameter, the folded angle of the tripod is 90 degrees, and the front end of the tripod body is completely between the inner and outer diameters of the annular component of the manhole ring base (that is, below the annular surface of the annular component), and will not be exposed at the manhole entrance and exit. The rest of the tripod is located outside the outer diameter of the manhole ring base.

[0063] 5. When used in manholes with diameters between the largest and the smallest, the folded angle of the tripod is between 0 and 90 degrees. Through the sliding adjustment between the first oblong hole of the tripod head and the arc-shaped slot of the annular component on the manhole ring base, the main body of the tripod is completely located between the inner and outer diameters of the annular component of the manhole ring base and will not be exposed at the manhole entrance and exit. The rest of the tripod is located outside the outer diameter of the manhole ring base;

[0064] 6. The second oblong hole at the end of the tripod is convenient for adjusting the height of each tripod, so that the upper planes of all tripods are at the same level, which is convenient for on-site construction;

[0065] 7. Each arc-shaped slot of the annular component has a certain length, so during installation, it is not necessary to require that all tripods be spaced at the same distance on the manhole wall, which facilitates on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic diagram of the structure of the cylindrical component in the present invention;

[0067] Figure 2 A schematic diagram of the development of the cylindrical component in the present invention;

[0068] Figure 3 A schematic diagram of the structure of the U-shaped groove on the cylindrical component of the present invention;

[0069] Figure 4 A schematic structural diagram of the annular component in the present invention;

[0070] Figure 5 A schematic diagram of the structure of the arc groove on the annular component of the present invention;

[0071] Figure 6 A schematic diagram of the structure of the square slot on the annular component of the present invention;

[0072] Figure 7 A schematic diagram of the structure of the well ring base in the present invention;

[0073] Figure 8 An expanded view of the tripod head of the present invention;

[0074] Fig. 9 A schematic diagram of the structure of the oblong groove on the tripod head in the present invention;

[0075] Fig.10 A schematic structural diagram of the tripod head in the present invention;

[0076] Fig.11 An expanded view of the tail portion of the tripod in the present invention;

[0077] Fig.12 A schematic structural diagram of the tail portion of the tripod in the present invention;

[0078] Fig.13 A schematic structural diagram of the tripod in the present invention. DETAILED DESCRIPTION

[0079] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0080] like Figure 1 As shown, the special bracket for manhole cover in the present invention includes: a manhole ring base and a tripod, and the specific structure is as follows:

[0081] 1. Well ring base

[0082] The well ring base includes: a cylindrical component and an annular component, the two ends of the cylindrical component are open, namely an upper open end and a lower open end, the radius of the large circle of the annular component is the same as the diameter of the cylindrical component, the outer edge of the annular component is fixedly connected to the lower open end of the cylindrical component, and the plane where the lower open end of the cylindrical component is located is parallel to the plane where the annular component is located.

[0083] The cylindrical component is provided with a plurality of U-shaped slots evenly distributed on the circumference, the opening of the U-shaped slots is located at the lower opening end of the cylindrical component, and the height direction of the U-shaped slots is parallel to the central axis of the cylindrical component. Figure 1 and Figure 2 As shown, Figure 2 This is the unfolding effect of a cylindrical part (taking four slots as an example). Figure 3 It is a schematic diagram of a U-shaped slot hole, wherein the hole width d of the U-shaped slot hole corresponds to the diameter of the fixing screws installed on the manhole wall (i.e., the fixing screws can pass through the U-shaped slot hole), and the hole height h corresponds to the height adjustment range of the manhole ring base (because it is difficult to ensure that the fixing screws on the manhole wall are installed in the same horizontal plane during actual construction, and the upper open end of the manhole ring base should be located in the horizontal plane after the manhole ring base is installed, so the height of the manhole ring base is adjusted by adjusting the hole height of each U-shaped slot hole, that is, adjusting the height of each fixing screw in the U-shaped slot hole where it is located to adjust the height of the manhole ring base, thereby ensuring that the upper open end of the manhole ring base is located in the horizontal plane.).

[0084] The annular component is provided with a plurality of arc-shaped slots and a plurality of square slots evenly distributed on the circumference. The arc-shaped slots and the square slots are alternately arranged at equal intervals on the circumference, that is, both sides of an arc-shaped slot are square slots, and both sides of a square slot are arc-shaped slots, so that the overall force can be uniformly applied. Figure 4 As shown, the number of arc-shaped slots is consistent with the number of U-shaped slots in the cylindrical part, and the number of square slots is also the same as the number of U-shaped slots, that is, the number of U-shaped slots, arc-shaped slots, and square slots are all the same. The height direction of each square slot is on the same straight line as a radial direction of the annular part, and the opening is located at the outer edge of the annular part. Each arc-shaped slot is concentric with the annular part, and its axis in the arc direction is located on the middle circumference line of the annular part. The middle circumference line is a circle, and its radius is the small circle radius of the annular part + (large circle radius of the annular part - small circle radius of the annular part) / 2, that is, (small circle radius of the annular part + large circle radius of the annular part) / 2.

[0085] Figure 5 It is a structural schematic diagram of the arc-shaped slot hole. The hole width d corresponds to the diameter of the fixing screw connecting the well ring base and the tripod. The hole length l corresponds to the rotation angle adjustment range of the well ring base. That is, the center of each arc-shaped slot hole is at the center of the line connecting the two square slot holes. The hole length l is equal to 1 / 4 of the arc length sandwiched by the two square slot holes. This can balance the adjustment range and structural force. Figure 6 It is a schematic diagram of a square slot hole. The hole width d corresponds to the diameter of the fixing screw installed on the well wall (that is, the fixing screw can pass through the square slot hole), that is, the same as the width of the U-shaped slot hole on the cylindrical component. The hole height h matches the length of the fixing screw installed on the well wall. The width, height and number of the U-shaped slot hole, arc slot hole and square slot hole can be designed according to actual needs.

[0086] When connecting the cylindrical component and the annular component, if both are made of metal materials, welding can be used to fix the outer edge of the annular component to the lower open end of the cylindrical component. The plane where the lower open end of the cylindrical component is located is parallel to the plane where the annular component is located, that is, the plane where the annular component is located is perpendicular to the central axis of the cylindrical component. If both are made of other materials, the corresponding fixed connection processing method for other materials can be used. When connected, the U-shaped slot hole of the cylindrical component is aligned with the square slot hole of the annular component, and the openings of the two are opposite to each other and connected to form an L-shaped slot hole (from the axial section of the cylindrical component). The effect model of the well ring base is as follows Figure 7As shown, the central hole of the annular component (i.e., the hole formed by the small circle of the annular component) becomes the entrance and exit of the manhole, that is, the radius of the entrance and exit of the manhole is the radius of the small circle of the annular component, and the construction personnel enter and exit the manhole through it. In order to enhance the connection strength between the two, a plurality of reinforcing ribs can be arranged between the cylindrical component and the annular component, and the reinforcing ribs include two vertically connected side edges, one of which is connected to the inner wall of the cylindrical component, and the other side is connected to the end face of the annular component.

[0087] When placing the inner manhole cover, the inner manhole cover can be placed directly on the upper open end of the cylindrical component, or a flange can be connected to the upper open end of the cylindrical component and the inner manhole cover can be placed on the flange. Various other structures can also be used to provide a contact surface with the inner manhole cover.

[0088] 2. Tripod

[0089] The tripod is formed by connecting a tripod head and a tripod tail.

[0090] The unfolded plan view of the tripod head is as follows Figure 8 As shown, it includes a first connecting part, a body and a second connecting part connected together, all of which are planar structures. The body is used to connect the first connecting part and the second connecting part, and its shape can be various shapes, such as a rectangle, a triangle, etc., but in order to prevent the edge of the body from causing harm to construction workers and to enhance the strength of the connection with the annular component, the shape of the body is preferably a right-angled trapezoid, including an upper base, a lower base, a right-angled waist and an oblique waist, the upper base and the lower base are parallel, the right-angled waist is perpendicular to the upper base and the lower base, the oblique waist intersects with the lower base to form an acute angle, and the acute angle at the intersection of the lower base of the right-angled trapezoid and the oblique waist is cut off to form a short side parallel to the right-angled waist.

[0091] The first connecting portion includes a first quarter circular surface 4, a first rectangular surface and a half circular surface 1 which are connected in sequence as one body (if a right angle is used here, the corners will be exposed in the circular hole of the annular component after folding, forming an obstacle to entering and exiting the manhole). After the three are connected, a long strip-shaped structure with arcs at both ends is formed. The radius of the first quarter circular surface 4, the width of the first rectangular surface and the diameter of the half circular surface 1 are the same. The radius of the first quarter circular surface 4, the long side of the first rectangular surface and the tangent direction of the half circular surface 1 are located on the same straight line, wherein the tangent directions of the two ... The radius of the first quarter-circular surface 4 on a straight line and the long side of the first rectangular surface constitute the connecting edge of the first connecting portion, and the connecting edge is fixedly connected to the right-angle waist of the body. After the connection, the straight line where the lower base of the body is located is tangent to the outer edge of the first quarter-circular surface 4, and the straight line where the upper base of the body is located is on the same straight line as the diameter of the half-circular surface 1. In this way, when the folded angle is 90 degrees, the weight of the annular component is directly transferred to the half-circular surface 1, and the upper base on the body provides strong support for the half-circular surface 1. A circular hole 3 is opened at the center of the first quarter-circular surface 4, and a first oblong hole 2 is opened on the first connecting portion, and the length direction of the first oblong hole 2 is parallel to the connecting edge.

[0092] The second connection part includes a second quarter circular surface 5 and a second rectangular surface connected in sequence, the radius of the second quarter circular surface 5 is the same as the width of the second rectangular surface, a radius of the second quarter circular surface 5 and a long side of the second rectangular surface are located on the same straight line, forming a connecting edge of the second connection part, the connecting edge is fixedly connected to the short side on the body, and the length of the connecting edge is equal to the short side of the body, the other long side of the second rectangular surface is tangent to the outer edge of the second quarter circular surface 5; the straight line where the lower bottom of the body is located is tangent to the outer edge of the second quarter circular surface 5. The width direction of the second rectangular surface is parallel to the upper and lower bottoms of the body. The centers of the first quarter circular surface 4 and the second quarter circular surface 5 are located on the same straight line, and the radii of the two are equal. A circular hole 3 is opened on the second connection part, and the centers of the two circular holes 3 are also located on the same straight line. The purpose of adding rectangular surfaces to the first connection part and the second connection part is to increase the strength of the connection.

[0093] Fig. 9The schematic diagram of the structure of the first oblong hole 2 is shown in FIG. The hole width d corresponds to the diameter of the fixing screws connecting the manhole base and the tripod, that is, the same as the hole width d of the arc slot on the annular component, and the hole length l corresponds to the adjustment range of the inner manhole cover diameter (the hole length l has nothing to do with the length of the arc slot on the annular component, and corresponds to the difference between the outer diameter of the inner manhole base and the maximum manhole diameter supported for installation (the hole length l is greater than or equal to the radius of the manhole diameter minus the radius of the outer diameter of the manhole base plus half of the width of the annular component, and the width of the annular component = the large circle radius of the annular component - the small circle radius). Along Figure 8 The two dotted lines in the figure are bent 90 degrees in the same direction to form the tripod head. The effect model is shown in the figure Fig.10 As shown, the plane where the first connection part 1001 is located is parallel to the plane where the second connection part 1003 is located, and both are perpendicular to the plane where the body 1002 is located, and are located on the same side of the body 1002, the two circular holes 3 are aligned, and the central axes of the two are located on the same straight line. The tripod head can be formed by cutting and bending a whole piece of steel plate, or by welding each surface after processing separately.

[0094] The unfolded plan view of the tail of the tripod is as follows Fig.11 As shown, it includes: a bottom surface, a side surface, an upper connecting surface, and a lower connecting surface, all of which are rectangular. One side of the upper connecting surface is connected to the upper end of the bottom surface, and the other side is connected to the upper end of the side surface. One side of the lower connecting surface is connected to the lower end of the bottom surface, and the other side is connected to the lower end of the side surface. A circular hole 101 is opened on the upper connecting surface and the lower connecting surface, and a second oblong hole 102 is opened on the bottom surface. The hole width d of the second oblong hole 102 matches the diameter of the fixing screw installed on the well wall, that is, it is slightly larger than the diameter of the fixing screw. The fixing screw can be inserted into the hole, and the hole height l corresponds to the height adjustment range of the tripod. The upper connecting surface and the lower connecting surface have the same size. The long side of the upper connecting surface is connected to a short side of the bottom surface, the long side of the lower connecting surface is connected to another short side of the bottom surface, and the long side of the side surface is connected to a long side of the bottom surface. Along Fig.11 The three dotted lines in the figure are bent 90 degrees in the same direction to form the tail of the tripod. The effect model is shown in the figure below. Fig.12 As shown, the upper connecting surface 1201, the lower connecting surface 1203, and the side surface 1204 are all perpendicular to the bottom surface 1202 and are all located on the same side of the bottom surface 1202. The upper connecting surface 1201 is parallel to the lower connecting surface 1203. One short side of the upper connecting surface 1201 is connected to one short side of the side surface 1204, and the other short side of the side surface 1204 is connected to one short side of the lower connecting surface 1203. The tail of the tripod can be formed by cutting and bending a whole steel plate, or by welding each surface after processing separately.

[0095] During installation, bring the first connection part of the tripod head close to the upper connection surface of the tripod tail, align the circular hole 3 on the first connection part with the circular hole 101 on the upper connection surface, insert the screw after alignment, and the screw passes through the circular hole 3 on the first connection part and the circular hole 101 on the upper connection surface; at the same time, the second connection part of the tripod head is close to the lower connection surface of the tripod, align the circular hole 3 on the second connection part with the circular hole 101 on the lower connection surface, insert the screw after alignment, and the screw passes through the circular hole 3 on the second connection part and the circular hole 101 on the lower connection surface; the two circular holes 3 are connected to the tripod tail through their own screws, and the effect model after connection is as shown in the figure Fig.13 As shown. The screw in the circular hole 3 on the first connecting part is to prevent the tripod head and the tripod tail from being disengaged, and to prevent the screw from being loosened by external force. Specifically, the head of the screw can be screwed in from the upper edge of the nut. When the head of the screw is flush with the lower edge of the nut, the relative position of the screw and the nut can be fixed. Welding or other methods can be used. The purpose is to prevent the screw from being removed with a wrench or a screwdriver. At this time, the tripod head and the tripod tail can be flexibly rotated (the 1 / 4 circle at the first quarter circle surface 4 and the second quarter circle surface 5 is for flexible rotation), the two cannot be separated, and the screw cannot be screwed out of the nut. The screw in the circular hole 3 on the second connecting part is a fixing screw. After the angle between the tripod head and the tripod tail is determined, the two are tightened and fixed by the screw.

[0096] The method of using the device of the present invention is as follows:

[0097] When the diameter of the manhole is close to the outer diameter of the manhole ring base (i.e. the diameter of the large circle of the annular component) (judged according to the engineering standards during construction, the judgment standard is: before installation, fixing screws must be installed on the manhole wall, generally using expansion screws. If all the expansion screw rods can be exposed from the U-shaped slot holes of the cylindrical component, and the exposed length is sufficient to install the matching nuts), in this case, there is no need to use a tripod, and the manhole ring base can be directly installed on the manhole wall, that is, the manhole ring base is placed downward along the central axis of the manhole, and the fixing screws fixed on the manhole wall pass through the square slot holes on the annular component and enter the U-shaped slot holes on the cylindrical component. After adjusting the position of each fixing screw, tighten the nuts that match each screw, so that the manhole ring base is fixed by the fixing screws and nuts on the manhole wall.

[0098] When the caliber of the manhole is not close to that of the well ring base, that is, when there is a large difference, first install the tail of the tripod (at this time, the tail of the tripod and the head of the tripod have been flexibly connected to form a whole) on the fixing screws on the wall of the manhole, and do not tighten them at this time. Then install the well ring base on the tripod, adjust the position of each fixing screw installed on the well wall in the second oblong hole so that the upper open end of the cylindrical component is located in the horizontal plane, and then tighten the nuts matched with each fixing screw installed on the well wall. Connect the first oblong hole 2 on the first connecting part of the tripod head with the arc-shaped slot hole on the annular component on the well ring base with fixing screws, and do not tighten them at this time.

[0099] When the folding angle of the tripod (the folding angle of the bracket refers to the angle formed by the body of the tripod head and the bottom surface of the tripod tail) is 90 degrees (that is, the body of the tripod head is perpendicular to the bottom surface of the tripod tail), the special bracket for inner manhole cover of the present invention has reached the maximum caliber that can be installed in the manhole. When the manhole diameter is between the minimum caliber and the maximum caliber, the folding angle of the bracket can be adjusted to the corresponding angle (first insert screws between all the arc-shaped slots on the annular component and the first oblong holes of the corresponding tripod head but do not tighten them, and then rotate the entire manhole ring base until it cannot rotate. At this time, the half-circular surface 1 of the first connecting part of the tripod head and a part of the first rectangular surface are completely located below the annular component, and the other parts of the first rectangular surface and the tripod tail are all located outside the outer diameter of the annular component, that is, the tripod will not be exposed within the inner diameter of the annular component (that is, it will not be located within the small circle of the annular component.), then tighten the fixing screws on the second connecting part and the screws connecting the first connecting part and the annular component), and complete the connection and fixation of the manhole ring base and the tripod. At the same time, all tripod heads can be completely retracted outside the inner ring of the manhole base, without forming any obstacles to the entrance and exit of the manhole, and without affecting the construction workers entering and exiting the manhole.

[0100] The fixing screw on the manhole wall is inserted into the second oblong hole 102 at the tail of the tripod. The second oblong hole at the tail of the tripod is for adjusting the height of the tripod. Because all the tripods installed on the manhole wall need to support a manhole ring base together, the upper surfaces of the first connecting parts of all the tripod heads should be in the same plane. In actual construction, it is difficult to ensure that the installation of the fixing screws is in the same horizontal plane, so the height of each tripod can be adjusted through its own oblong hole, so as to ensure that the upper surfaces of the first connecting parts of the tripod heads of all the tripods are in the same plane, that is, to ensure that the upper opening end of the manhole ring base is located in the horizontal plane.

[0101] To summarize, when the manhole diameter is similar to the outer diameter of the manhole ring base, the manhole ring base can be directly installed on the manhole wall through the U-shaped slot, and there is no need to use a tripod. When the manhole diameter is quite different from the manhole ring base diameter, the manhole ring base needs to be used in conjunction with the tripod. The second oblong hole on the bottom surface of the tail of the tripod is installed on the manhole wall through the fixing screws on the well wall, and the first oblong hole on the head of the tripod is connected to the annular slot on the manhole ring base with fixing screws. The folded angle of the tripod is adjusted to a suitable angle to complete the connection and fixation of the manhole ring base and the tripod. At the same time, all tripod heads can be completely retracted outside the inner ring of the manhole ring base. When adjusting the folding angle, all the arc-shaped slots on the annular component are equally spaced. If the fixing screws on the manhole wall are equidistant, the folding angles of each tripod are the same. However, in actual construction, it is difficult for the fixing screws on the manhole wall to be completely equally spaced. Therefore, all tripods are not evenly distributed in the manhole wall. At this time, the folding angles of each tripod are not exactly the same. Different folding angles can be used to adapt to fixing screws with unequal spacing.

[0102] The bracket provided by the present invention is used to support inner manhole covers of the same size in manholes of different diameters. As for how to prevent the inner manhole cover from being stolen and other related designs of the inner manhole cover, they are not related to the present invention and are therefore not described in detail in the present invention.

[0103] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific implementation mode of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. A special bracket for manhole covers, characterized in that: The special bracket for manhole cover in the manhole comprises: a manhole ring base; the manhole ring base comprises: a cylindrical part and an annular part; The cylindrical component has two openings at both ends, namely an upper opening end and a lower opening end; the cylindrical component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the lower opening end of the cylindrical component; The annular component is provided with slots evenly distributed on the circumference, and the openings of the slots are located at the outer edge of the annular component; The radius of the large circle of the annular component is the same as the diameter of the cylindrical component, and the outer edge of the annular component is fixedly connected to the lower open end of the cylindrical component; the opening of the slot on the cylindrical component is aligned with the opening of the slot on the annular component, and the two are connected to form an L-shaped slot; The special bracket for the manhole cover in the manhole includes a tripod, and the tripod can be connected to the manhole ring base by fixing screws; The tripod comprises a tripod head and a tripod tail; the tripod head comprises a first connecting portion, a body and a second connecting portion which are connected as one body, and all of the three are planar structures; the first connecting portion and the second connecting portion are parallel and perpendicular to the body and are located on the same side of the body; circular holes are opened on the first connecting portion and the second connecting portion; The tail portion of the tripod includes a bottom surface, a side surface, an upper connecting surface, and a lower connecting surface that are connected together. The bottom surface and the side surface are vertically connected. The upper connecting surface and the lower connecting surface are parallel and perpendicular to the bottom surface and the side surface. The upper connecting surface, the lower connecting surface, and the side surface are all located on the same side of the bottom surface. One side of the upper connecting surface is connected to the upper end of the bottom surface, and the other side is connected to the upper end of the side surface. One side of the lower connecting surface is connected to the lower end of the bottom surface, and the other side is connected to the lower end of the side surface. Circular holes are opened on the upper connecting surface and the lower connecting surface. The first connection part is located below the upper connection surface, and the two can be movably connected by screws installed at the circular hole; the second connection part is located above the lower connection surface, and the two can be movably connected by screws installed at the circular hole, and the angle formed by the main body and the bottom surface is the folded angle of the tripod, and the folded angle is 0 to 90 degrees; The cylindrical component and the annular component are connected, both of which are made of metal materials, and the outer edge of the annular component is fixedly connected to the lower opening end of the cylindrical component by welding.

2. The special bracket for manhole cover according to claim 1, characterized in that: The plane where the lower open end of the cylindrical component is located is parallel to the plane where the annular component is located; the plane where the annular component is located is perpendicular to the central axis of the cylindrical component; Each slot on the cylindrical component is a U-shaped slot, and the height direction of the U-shaped slot is parallel to the central axis of the cylindrical component; The width of the U-shaped slot matches the diameter of the fixing screw installed on the well wall; Each slot on the annular component is a square slot, and the height direction of each square slot is located on the same straight line as a radius direction of the annular component; The hole width of the square slot is the same as the hole width of the U-shaped slot, and the hole height of the square slot matches the length of the fixing screw installed on the well wall.

3. The special bracket for manhole cover according to claim 2, characterized in that: The annular component is provided with arc-shaped slots evenly distributed on the circumference; Each of the arc-shaped slots is concentric with the annular component, and the axis of the arc-shaped slots is located on the middle circumference of the annular component. The middle circumference is a circle, and its radius is (small circle radius of the annular component + large circle radius of the annular component) / 2; The width of the arc-shaped slot matches the diameter of the fixing screws connecting the well ring base and the tripod; The arc-shaped slots and the square slots are alternately arranged at equal intervals on the circumference; The number of the U-shaped slots, arc-shaped slots, and square slots are the same; The center of each arc-shaped slot hole is located at the center of the line connecting the two square slot holes on its two sides, and the length of the hole is equal to 1 / 4 of the length of the arc sandwiched by the two square slot holes on its two sides.

4. The special bracket for manhole cover according to claim 3 is characterized in that: The shape of the body is a right-angled trapezoid, including a lower base, a right-angled waist, an upper base and an oblique waist connected in sequence; the upper base and the lower base are parallel, the right-angled waist is perpendicular to the upper base and the lower base, the oblique waist intersects with the lower base to form an acute angle, and the acute angle at the intersection of the lower base and the oblique waist of the right-angled trapezoid is cut off to form a short side parallel to the right-angled waist; The first connecting portion comprises a first quarter circular surface, a first rectangular surface and a half circular surface which are connected in sequence to form a long strip-shaped structure with arcs at both ends after the three are connected; the radius of the first quarter circular surface, the width of the first rectangular surface and the diameter of the half circular surface are the same; a radius of the first quarter circular surface, the long side of the first rectangular surface and the tangent direction of the half circular surface are located on the same straight line, wherein the radius of the first quarter circular surface and the long side of the first rectangular surface located on the same straight line constitute the connecting edge of the first connecting portion, and the connecting edge is fixedly connected to the right-angle waist of the body, the straight line where the lower base of the body is located is tangent to the outer edge of the first quarter circular surface, and the straight line where the upper base of the body is located and the diameter of the half circular surface are located on the same straight line; a circular hole is opened at the center position of the first quarter circular surface; The second connecting portion comprises a second quarter circular surface and a second rectangular surface connected in sequence, the radius of the second quarter circular surface is the same as the width of the second rectangular surface, a radius of the second quarter circular surface and a long side of the second rectangular surface are located on the same straight line, and the two constitute a connecting edge of the second connecting portion, the connecting edge is fixedly connected to the short side on the body, and the length of the connecting edge is equal to the short side of the body; the other long side of the second rectangular surface is tangently connected to the outer edge of the second quarter circular surface; the straight line where the lower bottom of the body is located is tangent to the outer edge of the second quarter circular surface; the width direction of the second rectangular surface is parallel to the upper bottom and the lower bottom of the body; a circular hole is opened at the center of the second quarter circular surface; The centers of the first quarter-circular surface and the second quarter-circular surface are located on the same straight line, and the radii of the two are equal; the centers of the circular holes on the first quarter-circular surface and the circular holes on the second quarter-circular surface are located on the same straight line; A first oblong hole is formed on the first connecting portion, and a length direction of the first oblong hole is parallel to a connecting edge of the first connecting portion; The width of the first oblong hole is equal to the width of the arc-shaped slot on the annular component, and the hole length is greater than or equal to the radius of the manhole diameter minus the radius of the large circle of the annular component plus half the width of the annular component, and the width of the annular component is equal to the radius of the large circle of the annular component minus the radius of the small circle; The first oblong hole cooperates with the arc-shaped slot of the annular component, and the tripod head can be connected to the annular component after screws are inserted into the first oblong hole and the arc-shaped slot; A second oblong hole is opened on the bottom surface, and the width of the second oblong hole matches the diameter of a fixing screw installed on the well wall.

5. The special bracket for manhole cover according to claim 1, characterized in that: Reinforcing ribs evenly distributed on the circumference are arranged between the cylindrical component and the annular component; the reinforcing ribs include two vertically connected sides, one of which is connected to the inner wall of the cylindrical component, and the other is connected to the end face of the annular component.

6. The method for using the special bracket for manhole cover according to any one of claims 1 to 5, characterized in that: The method comprises: (1) Determine whether the diameter of the manhole where the inner manhole cover is to be installed is close to the diameter of the large circle of the annular component. If so, proceed to step (2); if not, proceed to step (3); (2) Install the manhole ring base directly in the manhole, and then proceed to step (4); (3) Connect the tripod head to the tripod tail, and install the tripod tail on the wall of the manhole; install the well ring base on the tripod, and adjust the folding angle of each tripod by rotating the well ring base until all tripods are not located within the small circle of the annular component; then fix the well ring base to the tripod, fix the tripod head to the tripod tail, and then go to step (4); (4) Install the inner manhole cover onto the upper open end of the cylindrical component.

7. The method according to claim 6, characterized in that: The operation of determining whether the diameter of the manhole where the inner manhole cover is to be installed is close to the diameter of the large circle of the annular component in step (1) includes: First, install the fixing screws on the wall of the manhole, and then lower the base of the manhole ring along the central axis of the manhole. If all the fixing screws on the wall can be exposed from the U-shaped slot holes of the cylindrical part, and the exposed length can be used to install the matching nuts, then it is determined that the diameter of the manhole is close to the diameter of the large circle of the annular part. If one or more fixing screws on the wall cannot be exposed from the U-shaped slot holes of the cylindrical part, or the exposed length of one or more fixing screws is not enough to install the matching nuts, then it is determined that the diameter of the manhole is not close to the diameter of the large circle of the annular part.

8. The method according to claim 7, characterized in that: The operation of step (2) includes: The manhole ring base is lowered along the central axis of the manhole, and the fixing screws fixed on the manhole wall pass through the square slots on the annular component and then enter the U-shaped slots on the cylindrical component; Adjust the position of each fixing screw in the U-shaped slot hole so that the upper open end of the cylindrical component is located in the horizontal plane; Tighten the nuts that go with each set screw.

9. The method according to claim 8, characterized in that: The operation of connecting the tripod head to the tripod tail in step (3) includes: The first connection part of the tripod head is brought close to the lower end surface of the upper connection surface of the tripod tail, and the round hole on the first connection part is aligned with the round hole on the upper connection surface, and then a screw is inserted. The screw passes through the round hole on the upper connection surface and the round hole on the first connection part in sequence, and then is screwed in from the upper end of the nut matched therewith. When the head of the screw is flush with the lower end surface of the nut, the relative position of the screw and the nut is fixed. At this time, the tripod head can rotate relative to the tripod tail, but the two cannot be separated, and the screw cannot be screwed out of the nut; At the same time, bring the second connection part of the tripod head close to the upper end surface of the lower connection surface of the tripod tail, align the round hole on the second connection part with the round hole on the lower connection surface, and insert the screw. The screw passes through the round hole on the second connection part and the round hole on the lower connection surface in turn, and then screws into the matching nut without tightening. The operation of installing the tail of the tripod onto the wall of the manhole in step (3) includes: Insert the fixing screw on the wall of each manhole into the corresponding second oblong hole at the end of the tripod, screw the matching nut into the fixing screw, but do not tighten it; The operation of installing the well ring base onto the tripod in step (3) includes: Placing the well ring base on each tripod, and making the arc-shaped slots on the annular component correspond one to one with the first oblong holes on the tripod heads; Pass the fixing screw through the arc-shaped slot on the annular component and the first oblong hole on the tripod head in sequence, and then screw it into the matching nut without tightening it; Adjust the positions of the fixing screws installed on the well wall in the second oblong hole so that the upper opening end of the cylindrical component is located in the horizontal plane, and then tighten the nuts matched with the fixing screws; The operations of fixing the well ring base to the tripod and fixing the tripod head to the tripod tail in step (3) include: Tighten the nut matched with the screw that passes through the arc-shaped slot on the annular component and the first oblong hole on the tripod head in sequence; Tighten the nut matched with the screw that passes through the circular hole on the second connecting part and the circular hole on the lower connecting surface in sequence.

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