Manhole cover seat ring installation auxiliary device, use method, and seat ring installation structure

Abstract

The present invention discloses a manhole cover seat ring installation auxiliary device including: a seat ring support assembly, which is arranged at the lower end of the seat ring, the lower end of which contacts a hard and solid foundation, and adjusts the height and horizontality of the supporting seat ring; an inner template, which is annular and is sleeved inside the seat ring, and the outer side surface of the lower end is fitted or flush with the inner wall of the wellhead; an inner template fixing assembly, which is arranged at the upper end of the seat ring, and is opposite to the inner template fixed limit in the seat ring; an inner template external support assembly, which is arranged in the seat ring, facing the inner template, and supports the inner template externally. The innovative device adopted by the present invention has a simple construction process, and can conveniently cast the base concrete of the manhole cover seat ring, ensure the foundation strength of the manhole cover seat ring, and is not easy to be damaged; at the same time, it can ensure that the manhole cover is accurately parallel to the road surface after construction, and the error can be controlled within one millimeter, and the manhole cover can still maintain a good flatness with the road surface after long-term use.

Description

Technical Field

[0001] The invention relates to the field of manhole cover installation, and in particular to a manhole cover seat ring installation auxiliary device, a use method, and a seat ring installation structure. Background Art

[0002] Manhole covers are devices used to cover deep wells on roads or in homes to prevent people or objects from falling. Manhole covers used on roads or roadsides are generally either integrated or split structures. The integrated structure means that the manhole cover seat ring and the cover plate are hinged together, and the cover plate can be flipped up and opened. The split structure means that the cover plate can be completely separated from the manhole cover seat ring.

[0003] The top of the road observation well uses a prefabricated well ring as a hard foundation to support the manhole cover seat. After the standard construction of the prefabricated well ring, there is generally a height difference of about 30 centimeters between the hard foundation formed by the well ring and the manhole cover seat that is finally installed and flush with the road surface. However, in the actual construction process, due to various factors, the actual height difference is between 20 and 80 centimeters. Therefore, it is necessary to build fillers in the gap between the height differences to support the manhole cover seat, such as by pouring cement mortar or laying bricks.

[0004] When the supporting material is brickwork, it is usually impossible to make the upper end of the manhole cover ring flush with the road surface after the completion of the construction. Some cement mortar needs to be filled (or the cement mortar used for bonding between brickwork is squeezed after being stressed, resulting in a decrease in height). Therefore, the height of the manhole cover ring after completion is usually lower than the road surface, resulting in pits on the road surface. At the same time, due to the low structural strength of the block structure, the manhole cover will sink after a period of use on the road surface (commonly seen as cracks in the road surface around the manhole cover ring), resulting in the appearance or further deepening of pits.

[0005] When the filling support is cement mortar, due to its fluidity, a template is needed to limit it to prevent the wellhead at the lower end of the manhole cover seat from deforming. However, there is currently no better solution to effectively fix the template. At the same time, the cement mortar will sink under the force when it is not solidified, so the upper end of the manhole cover seat placed on it is also difficult to keep it flush with the road surface. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a manhole cover seat ring installation auxiliary device, a method of use, and a seat ring installation structure, which can accurately adjust the height and levelness of the manhole cover seat ring, and the installation and construction are simple. After the installation, the upper end of the manhole cover seat ring can still remain flush with the road surface after long-term use.

[0007] The objective of the present invention is achieved through such technical solution:

[0008] Manhole cover seat ring installation auxiliary device, including:

[0009] The seat ring support assembly is arranged at the lower end of the seat ring, the lower end of which contacts the hard foundation, and adjusts the height and levelness of the supporting seat ring;

[0010] The inner template is annular and is sleeved inside the seat ring, with the outer side surface of the lower end being in contact with or flush with the inner wall of the wellhead;

[0011] The inner mold fixing assembly is arranged at the upper end of the seat ring and is fixed and limited to the inner mold plate arranged in the seat ring;

[0012] The inner mold outer support assembly is arranged in the seat ring, facing the inner mold plate and supporting the inner mold plate.

[0013] Further, the seat ring support assembly includes a plurality of support parts arranged in an array around the center circumference of the seat ring, and the support parts include:

[0014] A support member is arranged at the lower end of the seat ring to support the seat ring; the support member includes: a lower support plate, arranged below the seat ring and extending outward from the outside of the seat ring; an upper pressure plate, arranged above the seat ring, and fixed to the seat ring by clamping the lower end of the seat ring together with the lower support plate; the height adjustment member is arranged on the lower support plate.

[0015] A height adjustment member is connected to the support member to adjust the height of the support member; the height adjustment member includes: a support nut, a through hole is provided on the lower support plate; the support nut is arranged on the lower support plate and is opposite to the through hole; a support screw rod is meshed with the support nut, and the screw head is located directly below the support nut and is in contact with the hard foundation.

[0016] Furthermore, the inner mold fixing assembly includes a plurality of fixing parts arranged in an array around the center circumference of the seat ring, and the fixing parts include:

[0017] The fastener is U-shaped and buckled on the upper end of the seat ring; the wing plate of the fastener located on the outer side of the seat ring is provided with an internal threaded hole facing the outer side of the seat ring;

[0018] An extrusion screw is arranged on the outside of the fastener and passes through the internal thread hole to squeeze the outside of the seat ring, forcing the fastener to move toward the outside of the seat ring;

[0019] The cushion block is arranged in the fastener and fits with the inner side of the seat ring. The upper end of the inner template is located between the inner side of the fastener and the cushion block and is squeezed and fixed by the fastener and the cushion block.

[0020] Furthermore, the inner mold outer support assembly includes:

[0021] Screw rod, located inside;

[0022] Two base plates are sequentially sleeved on the screw rod, and a plurality of sleeve rods are arranged in a row along the circumference of the screw rod axis on the base plate;

[0023] Two adjusting nuts are engaged on the screw rod and are respectively located at the upper and lower ends of the two base plates to limit the movement of the two base plates;

[0024] A plurality of inner support members, wherein the inner support members are two inner support plates hinged together; the two ends of the inner support members are respectively sleeved with sleeve rods of the two base plates,

[0025] A plurality of outer support members are hinged at the hinged positions of the two inner support plates; when the two base plates are close to each other, the outer support plates are supported outwards to contact the inner side surface of the inner template.

[0026] Furthermore, the base plate includes:

[0027] Two base plates are circular and fixed together by stacking them up and down with bolts. A center hole is provided in the middle and a screw rod is placed outside. A plurality of notch grooves are arranged in a circular array around the center hole on the base plate. An annular groove surrounding the screw rod is provided on the base plate, and the annular groove faces the notch groove. The annular grooves on the two base plates face each other to form a receiving cavity.

[0028] The annular member is arranged in the accommodating cavity formed by the two base plates and exposed at the position of the notch groove to form a sleeve rod.

[0029] Furthermore, it also includes two connecting members, which are respectively arranged on the two adjusting nuts, and the connecting members are provided with positioning holes facing the substrate; the substrate is provided with a latch hole that can be connected with the positioning holes;

[0030] The latch pin can pass through the positioning hole and the latch pin hole in sequence to limit the rotation of the adjusting nut on the screw rod.

[0031] Furthermore, the outer support member comprises:

[0032] Two splints, located on both sides of the hinged joint of the two inner support plates, are hinged to the inner support plates;

[0033] The outer support plate is fixedly connected to the two clamping plates and is located outside the inner support plate;

[0034] Furthermore, it also includes:

[0035] The suspension rod is placed horizontally on the upper end of the seat ring;

[0036] A suspension nut is engaged on the lead screw;

[0037] The lifting rope is connected to the lifting rod at both ends, and the middle part is wrapped around the screw rod and located below the lifting nut.

[0038] The method for using the manhole cover seat ring installation auxiliary device comprises the following steps:

[0039] S1. Install multiple support parts on the seat ring in an array around the center of the seat ring, and turn the support screw to adjust the height of the upper end of the seat ring until the upper end of the seat ring is flush with the road surface;

[0040] S2, insert the inner template into the seat ring, then install multiple fixing parts on the seat ring in an array around the center of the seat ring, then insert the upper end of the inner template between the fastener and the cushion block, and turn the extrusion screw so that the fastener and the cushion block squeeze the inner template to fix the upper end of the inner template;

[0041] S3, insert the inner mold outer support assembly into the inner mold plate, adjust the height of the upper base plate so that the outer support plate contacts the inner mold plate, and then screw the upper adjustment nut to press the upper base plate downward until the outer support plate presses the inner mold plate so that its outer side is in contact with the inner wall of the wellhead; then continue to screw the adjustment nut until the positioning hole is coaxial with the pin hole, and then insert the pin to limit the rotation of the adjustment nut;

[0042] S4, pour concrete mortar onto the outside of the inner formwork, and after the concrete mortar solidifies, reverse step S3 to take out the inner formwork outer support assembly, then reverse step S2 to separate and take out the fixing part from the seat ring, and finally take out the inner formwork.

[0043] The installation structure of the manhole cover seat ring is obtained by installing the manhole cover seat ring using the use method as described in claim 9.

[0044] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0045] 1. The seat ring support assembly can stably fix the seat ring on the concrete base, and at the same time can adjust its support height, so as to adjust the height of the upper end of the seat ring, and finally make the upper end of the seat ring completely flush with the road surface.

[0046] 2. The inner mold fixing assembly can effectively fix the inner mold to the seat ring, limit the inner mold, determine the concrete mortar filling area in the inner mold, and effectively fix the seat ring.

[0047] 3. The inner mold external support assembly can support the lower end of the inner mold so that the lower end of the inner mold is flush with or fits the inner wall of the wellhead; it prevents the concrete mortar outside the inner mold from flowing into the wellhead, which can effectively prevent mold explosion.

[0048] 4. After installation, the inner formwork, inner formwork fixing assembly and inner formwork outer support assembly can be disassembled and reused. The seat ring support assembly fixed in the concrete mortar can play a role similar to the steel bars in the concrete, enhancing the strength of the concrete, so that the seat ring remains flush with the road surface without collapsing after a period of use.

[0049] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings of the present invention are as follows:

[0051] Figure 1 It is a schematic diagram of the cross-sectional structure of the auxiliary device for installing the seat ring of the manhole cover in the embodiment (the hoisting rod and the hoisting rope are not shown).

[0052] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0053] Figure 3 for Figure 1 Enlarged structural diagram at B in the middle.

[0054] Figure 4 for Figure 1 Enlarged structural diagram at point C in the middle.

[0055] Figure 5 for Figure 4 Enlarged structural diagram at D in the middle.

[0056] Figure 6 for Figure 1 Enlarged structural diagram at E in the middle.

[0057] Figure 7 It is a schematic diagram of the top view of the structure of the manhole cover seat ring installation auxiliary device in the embodiment.

[0058] Figure 8 for Figure 7 Enlarged structural diagram at F in the middle.

[0059] Fig. 9 for Figure 7 Enlarged structural diagram at G in the middle.

[0060] Fig.10 Schematic diagram of the process used in the embodiment.

[0061] In the figure: 11. Support member; 111. Lower support plate; 112. Upper pressure plate; 121. Support nut; 122. Support screw; 2. Inner template; 31. Fastener; 32. Extrusion screw; 33. Spacer; 41. Screw; 421. Base plate; 4211. Notch groove; 4212. Annular groove; 422. Ring member; 4221. Sleeve rod; 43. Adjustment nut; 44. Inner support member; 45. Outer support member; 451. Clamp; 452. Outer support plate; 5. Wellhead; 6. Concrete base; 7. Concrete mortar; 8. Connector; 9. Pin; 100. Lifting rod; 101. Lifting nut; 102. Lifting rope; 200. Seat ring. DETAILED DESCRIPTION

[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] Example:

[0064] like Figures 1 to 9 As shown, the manhole cover seat ring 200 installation auxiliary device includes:

[0065] The seat ring 200 support assembly is arranged at the lower end of the seat ring 200, the lower end of which contacts the hard foundation, and adjusts the height and levelness of the support seat ring 200;

[0066] The inner template 2 is annular and is sleeved in the seat ring 200, and the outer side surface of the lower end is in contact with or flush with the inner wall of the wellhead 5;

[0067] The inner mold fixing assembly is arranged at the upper end of the seat ring 200 and is fixedly limited to the inner mold plate 2 placed in the seat ring 200;

[0068] The inner mold outer support assembly is arranged in the seat ring 200, facing the inner mold plate 2, and supporting the inner mold plate 2.

[0069] The seat ring 200 support assembly can stably fix the seat ring 200 on the concrete base 6, and can also adjust its support height, thereby adjusting the height of the upper end of the seat ring 200, and finally achieving that the upper end of the seat ring 200 is completely flush with the road surface.

[0070] The inner mold fixing assembly can effectively fix the inner mold 2 to the seat ring 200 , and limit the inner mold 2 to determine the concrete mortar 7 filling area in the inner mold 2 , thereby effectively fixing the seat ring 200 .

[0071] The inner mold outer support assembly can support the lower end of the inner mold 2 so that the lower end of the inner mold 2 is flush with or fits the inner wall of the wellhead 5; preventing the concrete mortar 7 outside the inner mold 2 from flowing into the wellhead 5, which can effectively prevent mold explosion.

[0072] After installation, the inner formwork 2, the inner formwork fixing assembly and the inner formwork outer support assembly can be disassembled and reused. The seat ring 200 support assembly fixed in the concrete mortar 7 can play a role similar to that of steel bars in concrete, thereby enhancing the strength of the concrete, so that the seat ring 200 remains flush with the road surface without collapsing after a period of use.

[0073] In this embodiment, the seat ring 200 support assembly includes a plurality of support parts, which are arranged in an array around the center of the seat ring 200. Three support parts can be selected, and the adjustment speed is fast;

[0074] The support portion comprises:

[0075] A support member 11 is provided at the lower end of the seat ring 200 to support the seat ring 200;

[0076] The height adjusting member is connected to the supporting member 11 and is used to adjust the height of the supporting member 11 .

[0077] The support member 11 supports the seat ring 200 to maintain its stability, and the height adjustment member adjusts its height to control the height of the seat ring 200.

[0078] In this embodiment, the support member 11 includes:

[0079] The lower support plate 111 is arranged below the seat ring 200 and extends outward from the outside of the seat ring 200;

[0080] The upper pressing plate 112 is disposed above the seat ring 200 , and is fixed on the seat ring 200 by clamping the lower end of the seat ring 200 together with the lower supporting plate 111 ; the height adjusting member is disposed on the lower supporting plate 111 .

[0081] The lower support plate 111 and the upper pressure plate 112 are fixedly connected together by three bolts to clamp the seat ring 200 .

[0082] In this embodiment, the height adjustment member includes:

[0083] A support nut 121, wherein the lower support plate 111 is provided with a through hole; the support nut 121 is arranged on the lower support plate 111, facing the through hole;

[0084] The support screw 122 is meshed with the support nut 121, and the screw head is located directly below the support nut 121 and contacts the hard foundation.

[0085] The height of the lower support plate is adjusted by screwing the support screw 122, thereby adjusting the height of the seat ring 200. After pouring the concrete mortar 7, the lower support plate 111, the upper pressing plate 112, the support nut 121 and the support screw 122 are similar to the steel bar structure to strengthen the concrete mortar 7 structure.

[0086] In this embodiment, the inner mold fixing assembly includes a plurality of fixing parts arranged in an array around the center of the seat ring 200, and the fixing parts include:

[0087] The fastener 31 is U-shaped and is buckled on the upper end of the seat ring 200;

[0088] An extrusion member is disposed outside the fastener 31 and passes through the fastener 31 to press the outside of the seat ring 200, forcing the fastener 31 to move toward the outside of the seat ring 200;

[0089] The pad 33 is arranged inside the fastener 31 and fits against the inner side of the seat ring 200 . The upper end of the inner template 2 is located between the inner side of the fastener 31 and the pad 33 and is squeezed and fixed by the fastener 31 and the pad 33 .

[0090] In this embodiment, the fastener 31 is provided with an internal threaded hole on the wing plate located outside the seat ring 200, facing the outside of the seat ring 200; the extrusion member is an extrusion screw 32, which passes through the internal threaded hole to extrude the outside of the seat ring 200.

[0091] This embodiment adopts the structure of internal threaded hole. If the thickness of fastener 31 is thin, a nut can be welded on fastener 31, and the position of screw 32 can be changed by squeezing screw 32 inside the nut, so as to clamp the inner template 2.

[0092] In this embodiment, the inner mold outer support assembly includes:

[0093] Screw rod 41, located inside;

[0094] Two base plates are sequentially sleeved on the screw rod 41, and a plurality of sleeve rods 4221 are arranged in a row along the circumference of the axis of the screw rod 41 on the base plate;

[0095] Two adjusting nuts 43 are engaged with the screw rod 41 and are respectively located at the upper and lower ends of the two base plates to limit the movement of the two base plates;

[0096] A plurality of inner support members 44, wherein the inner support members 44 are two inner support plates hinged together; the two ends of the inner support members 44 are respectively sleeved with sleeve rods 4221 of the two base plates,

[0097] A plurality of outer support members 45 are hinged at the hinges of the two inner support plates; the outer support plates 452 are supported outwardly to contact the inner side surface of the inner template 2 when the two base plates are close to each other.

[0098] The relative distance between the two base plates 421 is adjusted, and the outer support length of the inner support member 44 is controlled so that the outer support member 45 can support the inner side surface of the inner template 2 , and the two base plates are limited by the adjusting nut 43 .

[0099] The outer support member 45 and the inner mold plate 2 are pressed against each other to generate friction, so that the inner mold outer support assembly will not slide downward on the inner mold plate 2.

[0100] In this embodiment, the base plate includes:

[0101] Two base plates 421 are circular and fixed together by stacking them up and down with bolts. A center hole is provided in the middle, and a screw rod 41 is covered on the base plate 421. A plurality of notched grooves 4211 are arranged in a circular array around the center hole on the base plate 421. An annular groove 4212 surrounding the screw rod 41 is provided on the base plate 421. The annular groove 4212 faces the notched groove 4211. The annular grooves 4212 on the two base plates 421 face each other to form a receiving cavity.

[0102] The annular member 422 is disposed in the accommodation cavity formed by the two substrates 421 and is exposed at the position of the notch groove 4211 to form a sleeve rod 4221 .

[0103] In this embodiment, two connecting members 8 are further included, which are respectively arranged on two adjusting nuts. The connecting members 8 are provided with positioning holes facing the base plate 421; the base plate 421 is provided with a plug hole 9 that can be connected with the positioning holes;

[0104] The latch pin 9 can pass through the positioning hole and the latch pin 9 hole in sequence to limit the rotation of the adjusting nut on the screw rod 41.

[0105] In order to prevent the adjusting nut 43 from loosening on the screw rod 41 during use, a connecting piece 8 and a latch pin 9 are provided. The thread pitch of the screw rod 41 is very small, which can ensure that when the connecting piece 8 is rotated until the positioning hole and the latch pin 9 hole are aligned, the squeezing force of the adjusting nut 43 on the base plate is still maintained.

[0106] In this embodiment, the outer support member 45 includes:

[0107] Two clamping plates 451 are located on both sides of the hinged joint of the two inner support plates and are hinged to the inner support plates;

[0108] The outer support plate 452 is fixedly connected to the two clamping plates 451 and is located outside the inner support plate;

[0109] Also includes:

[0110] The suspension rod 100 is horizontally placed on the upper end of the seat ring 200;

[0111] The suspension nut 101 is engaged with the screw rod 41;

[0112] The lifting rope 102 is connected to the lifting rod 100 at both ends, and is wound around the screw rod 41 in the middle, and is located below the lifting nut 101 .

[0113] The hoisting rope 102 on the suspension rod 100 is wound around the screw rod 41 to ensure that the inner mold outer support assembly will not slide down.

[0114] like Fig.10 As shown, the method of using the auxiliary device for installing the manhole cover seat ring 200 of this embodiment is as follows:

[0115] Move the seat ring 200 to a position just above the wellhead 5, install the four support parts to the lower end of the seat ring 200, turn the support screw 122 to adjust the height of the seat ring 200, and align it with the wellhead 5 until the upper end of the seat ring 200 is flush with the road surface elevation.

[0116] Insert the inner template 2 into the seat ring 200, and install four fixing parts on the upper end of the seat ring 200, and turn the extrusion screw 32 so that the two sides of the upper end of the inner template 2 are squeezed by the inner side of the fastener 31 and the cushion block 33 respectively, so as to fix the inner template 2.

[0117] The connecting plate and the base plate at the lower end of the screw rod 41 are fixed by the pin 9 to limit the downward displacement of the base plate at the lower end of the screw rod 41, and then the inner mold and outer support assembly are inserted into the inner mold plate 2, and the adjusting nut 43 at the upper end of the screw rod 41 is turned to force the inner support member 44 to fold, and the outer support plate 452 squeezes the inner side surface of the inner mold plate 2 until the outer side surface of the inner mold plate 2 is tightly attached to the inner wall of the wellhead 5, and then the adjusting nut 43 is continued to be turned until the positioning hole and the pin 9 hole are aligned, and then the pin 9 is inserted to limit the adjusting nut 43 at the upper end of the screw rod 41.

[0118] Screw the lifting nut on the upper end of the screw rod 41 until the lifting nut is lower than the upper end of the seat ring 200. Place the suspension rod 100 horizontally on the seat ring 200, use the lifting rope 102 to wrap the part of the screw rod 41 below the lifting nut, and then connect the two ends to the suspension rod 100, so that the lifting rope 102 can hang the screw rod 41 to prevent it from sliding down.

[0119] Pay attention to the concrete mortar 7 on the outside of the inner formwork 2 to wrap the lower end of the seat ring 200 and the supporting part. After the concrete solidifies, remove the lifting rope 102, the hanging rod 100, the inner formwork and outer support assembly, the fixing part, and the inner formwork 2 in reverse order to complete the installation of the seat ring 200.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A manhole cover seat ring installation auxiliary device, characterized in that: include: The seat ring support assembly is arranged at the lower end of the seat ring, the lower end of which contacts the hard foundation, and adjusts the height and levelness of the supporting seat ring; The inner template is annular and is sleeved inside the seat ring, with the outer side surface of the lower end being in contact with or flush with the inner wall of the wellhead; The inner mold fixing assembly is arranged at the upper end of the seat ring and is fixed and limited to the inner mold plate arranged in the seat ring; The inner mold outer support assembly is arranged in the seat ring, facing the inner mold plate, and supporting the inner mold plate; The seat ring support assembly includes a plurality of support parts arranged in an array around the center circumference of the seat ring, and the support parts include: A support member is arranged at the lower end of the seat ring to support the seat ring; the support member includes: a lower support plate, arranged below the seat ring and extending outward from the outside of the seat ring; an upper pressure plate, arranged above the seat ring, and fixed to the seat ring by clamping the lower end of the seat ring together with the lower support plate; A height adjustment member is connected to the support member to adjust the height of the support member; the height adjustment member is arranged on the lower support plate; the height adjustment member comprises: a support nut, the lower support plate is provided with a through hole; the support nut is arranged on the lower support plate and faces the through hole; a support screw rod is meshed with the support nut, the screw head is located directly below the support nut and contacts the hard foundation; The inner mold fixing assembly includes a plurality of fixing parts arranged in an array around the center circumference of the seat ring, and the fixing parts include: The fastener is U-shaped and buckled on the upper end of the seat ring; the wing plate of the fastener located on the outer side of the seat ring is provided with an internal threaded hole facing the outer side of the seat ring; An extrusion screw is arranged on the outside of the fastener and passes through the internal thread hole to squeeze the outside of the seat ring, forcing the fastener to move toward the outside of the seat ring; The pad is arranged in the fastener and fits the inner side of the seat ring. The upper end of the inner template is located between the inner side of the fastener and the pad, and is squeezed and fixed by the fastener and the pad; The inner mold outer support assembly comprises: Screw rod, located inside; Two base plates are sequentially sleeved on the screw rod, and a plurality of sleeve rods are arranged in a row along the circumference of the screw rod axis on the base plate; Two adjusting nuts are engaged on the screw rod and are respectively located at the upper and lower ends of the two base plates to limit the movement of the two base plates; A plurality of inner support members, wherein the inner support members are two inner support plates hinged together; the two ends of the inner support members are respectively sleeved with sleeve rods of the two base plates, A plurality of external support members are hinged at the hinged positions of the two internal support plates; when the two base plates are close to each other, the external support members are supported outwards to contact the inner side surface of the inner template.

2. The manhole cover seat ring installation auxiliary device according to claim 1, characterized in that: The base plate comprises: Two base plates are circular and fixed together by stacking them up and down with bolts. A center hole is provided in the middle and a screw rod is placed outside. A plurality of notch grooves are arranged in a circular array around the center hole on the base plate. An annular groove surrounding the screw rod is provided on the base plate, and the annular groove faces the notch groove. The annular grooves on the two base plates face each other to form a receiving cavity. The annular member is arranged in the accommodating cavity formed by the two base plates and exposed at the position of the notch groove to form a sleeve rod.

3. The manhole cover seat ring installation auxiliary device according to claim 2, characterized in that: It also includes two connecting members, which are respectively arranged on the two adjusting nuts, and the connecting members are provided with positioning holes facing the base plate; the base plate is provided with a pin hole that can be connected with the positioning holes; The latch pin can pass through the positioning hole and the latch pin hole in sequence to limit the rotation of the adjusting nut on the screw rod.

4. The manhole cover seat ring installation auxiliary device according to claim 3, characterized in that: The outer support member comprises: Two splints, located on both sides of the hinged joint of the two inner support plates, are hinged to the inner support plates; The outer support plate is fixedly connected to the two clamping plates and is located on the outer side of the inner support plate.

5. The manhole cover seat ring installation auxiliary device according to claim 1, characterized in that: Also includes: The suspension rod is placed horizontally on the upper end of the seat ring; A suspension nut is engaged on the lead screw; The lifting rope is connected to the lifting rod at both ends, and the middle part is wrapped around the screw rod and located below the lifting nut.

6. The method for using the manhole cover seat ring installation auxiliary device according to claim 4, characterized in that: The following steps are involved: S1. Install multiple support parts on the seat ring in an array around the center of the seat ring, and turn the support screw to adjust the height of the upper end of the seat ring until the upper end of the seat ring is flush with the road surface; S2, insert the inner template into the seat ring, then install multiple fixing parts on the seat ring in an array around the center of the seat ring, then insert the upper end of the inner template between the fastener and the cushion block, and turn the extrusion screw so that the fastener and the cushion block squeeze the inner template to fix the upper end of the inner template; S3, insert the inner mold outer support assembly into the inner mold plate, adjust the height of the upper base plate so that the outer support plate contacts the inner mold plate, and then screw the upper adjustment nut to press the upper base plate downward until the outer support plate presses the inner mold plate so that its outer side is in contact with the inner wall of the wellhead; then continue to screw the adjustment nut until the positioning hole is coaxial with the pin hole, and then insert the pin to limit the rotation of the adjustment nut; S4, pour concrete mortar onto the outside of the inner formwork, and after the concrete mortar solidifies, reverse step S3 to take out the inner formwork outer support assembly, then reverse step S2 to separate and take out the fixing part from the seat ring, and finally take out the inner formwork.

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