Concrete cast-in-place mold for adjusting layer of circular inspection well lid

Abstract

The invention relates to the technical field of inspection well pouring, in particular to a circular inspection well lid adjusting layer concrete cast-in-place mold which comprises an annular mold plate, and the annular mold plate is formed by welding a plurality of reinforcing transverse plates to the tops of an inner ring mold plate and an outer ring mold plate; the spiral groove outer rod is erected in the center of the annular template, and the center of the top end of the spiral groove outer rod is in threaded connection with the spiral inner rod; the three multi-stage spiral lifting supporting rods are annularly distributed around the peripheral side of the vertical rod at equal intervals. Through cooperation of the side supporting plates, the bearing plates and the spiral transmission structure, rapid supporting and dismantling of the arc-shaped well wall formwork are achieved, the problems that bolt embedding operation is tedious, and the formwork is difficult to dismantle and cannot be recycled are solved, the construction difficulty is greatly reduced, the working time is shortened, and the construction efficiency is improved; the mold ensures no displacement in the pouring process through a multi-locking structure, the concrete pouring quality of the adjusting layer is guaranteed, the telescopic rod can be flexibly telescopic, and the pouring requirements of the adjusting layers of the circular inspection wells with different diameters are met.

Description

Technical Field

[0001] This invention relates to the technical field of manhole casting, specifically to a cast-in-place mold for the adjusting layer of a circular manhole cover. Background Technology

[0002] With social development, urban renewal is receiving increasing attention. To ensure the smooth operation of urban pipeline systems, it is necessary to maintain, update, renovate, and rebuild old pipelines, rationally plan and lay new pipelines, improve missing pipelines, connect old and new pipelines, and open up trunk and branch pipeline systems to gradually improve the quality and efficiency of pipeline systems.

[0003] Currently, existing municipal pipeline circular inspection wells are generally constructed using modular bricks, with fine aggregate concrete poured into the modular bricks to form the well wall, as shown in the diagram of the adjustment layer layout for circular inspection well covers (). Figure 10 As shown in the diagram. The elevation of the bottom of the manhole depends on the elevation of the bottom of the pipe, and the elevation of the manhole cover depends on the elevation of the road surface. Therefore, the elevations of the bottom of the manhole and the manhole cover generally cannot be changed arbitrarily. Since modular bricks are typically 170mm in height, after the top layer of modular bricks is laid, there is usually a height difference of 30mm-170mm between the manhole wall and the manhole cover. This height difference must be adjusted to the design elevation using cast-in-place concrete.

[0004] However, in existing technologies, the arc-shaped well wall structure of circular inspection wells presents significant challenges to the support and removal of formwork for the pouring of the adjusting layer concrete in actual construction scenarios. Typically, pre-embedded bolts are required within the well wall to assist in formwork fixation, making the process more cumbersome. Furthermore, the removed formwork, affected by the arc-shaped structure and residual pre-embedded bolts, is difficult to reuse directly, increasing construction costs and time while reducing efficiency. Consequently, violations frequently occur on construction sites, such as using lime-sand brick masonry and increasing the thickness of the mortar to adjust the manhole cover elevation instead of strictly adhering to the standard concrete pouring process. This practice easily leads to insufficient manhole cover installation stability and uneven stress, resulting in manhole cover settlement, damage, and other problems, affecting the safety of municipal road traffic and the stability of pipeline network operation and maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide a cast-in-place concrete mold for the adjusting layer of a circular inspection well cover, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cast-in-place concrete mold for the adjusting layer of a circular inspection well cover, comprising: An annular template, wherein the annular template is composed of multiple reinforcing horizontal plates welded to the top of the inner ring template and the outer ring template; The spiral groove outer rod is mounted at the center of the annular template. A spiral inner rod is threadedly connected to the top center of the spiral groove outer rod, and an L-shaped bracket is connected to the peripheral wall of the spiral groove outer rod. A multi-stage spiral lifting support rod is installed at the bottom of the annular template, and three multi-stage spiral lifting support rods are evenly distributed in a ring around the perimeter of the upright.

[0007] Preferably, six fixed rods are equidistantly connected in a ring on the bottom peripheral wall of the spiral groove outer rod, and a telescopic rod is movably sleeved at the end of the fixed rod. A guide groove is opened on the top wall of the fixed rod, and a guide block is connected to the side wall of the telescopic rod. The guide block is movably engaged in the guide groove.

[0008] Preferably, the outer end wall of the telescopic rod is connected to a side support plate, and a support plate is connected to the side wall of the side support plate. Both the side support plate and the support plate are arc-shaped. The height of the inner ring template is greater than the height of the outer ring template. The end of the support plate supports and fits against the bottom wall of the inner ring template, and the side wall of the side support plate fits against the inner side wall of the inner ring template.

[0009] Preferably, a first frustum is connected to the top of the spiral inner rod, a rotating ring is rotatably connected to the periphery of the first frustum, and push-pull rods are rotatably connected to the periphery of the rotating ring at equal intervals, with the other end of the push-pull rods rotatably connected to the guide block.

[0010] Preferably, the bottom wall of the multi-stage spiral lifting support rod is connected to a rubber mat, the top of the multi-stage spiral lifting support rod is connected to a second truncated cone, the peripheral wall of the second truncated cone is provided with anti-slip ridges, and a U-shaped support plate is rotatably connected to the center of the top of the second truncated cone, and the telescopic rod is snapped into the groove of the U-shaped support plate.

[0011] Preferably, anti-detachment baffles are connected to both the upper and lower ends of the upright, and three limiting grooves are equidistantly arranged in a ring on the periphery of the upright. Three collars are sequentially fitted on the periphery of the upright, and limiting blocks are connected to the inner walls of the collars. The limiting blocks are movably engaged in the limiting grooves, and the periphery of the collars is fixedly connected to the multi-stage spiral lifting support rod through a transverse connecting rod.

[0012] Preferably, a rotating ring handle is connected to the center of the top of the first truncated cone. Multiple limiting holes are equidistantly arranged in a ring on the end wall of the rotating ring handle. A T-shaped sliding groove is provided on the side wall of the L-shaped bracket. A T-shaped sliding plate is movably engaged in the T-shaped sliding groove. The T-shaped sliding plate is movably arranged above the rotating ring handle. A limiting post is connected to the bottom wall of the T-shaped sliding plate. The limiting post is inserted into the limiting hole.

[0013] Preferably, a trapezoidal groove is provided on the side wall of the T-shaped slide plate, a trapezoidal slider is movably engaged in the trapezoidal groove, an L-shaped limiting plate is connected to the bottom wall of the trapezoidal slider, the inner bottom wall of the L-shaped limiting plate is attached to the bottom wall of the rotating ring handle, and the top wall of the L-shaped limiting plate is attached to the bottom wall of the T-shaped slide plate.

[0014] Preferably, a rotating plate is rotatably connected to the top of the T-shaped sliding plate, and a stop block is connected to the side wall of the rotating plate. The stop block is movably disposed in the trapezoidal sliding groove, and the side wall of the stop block abuts against and fits against the trapezoidal sliding block.

[0015] Preferably, a screw is connected to the outer end of the rotating plate, and a limit plate is connected to the other end of the screw. A hand-tightening nut is threaded onto the screw and is movably disposed in a trapezoidal groove. A retaining ring is connected to the end wall of the hand-tightening nut, and a retaining block is connected to the side wall of the trapezoidal groove. The retaining block abuts against and fits against the inner wall of the retaining ring.

[0016] Compared with the prior art, this application has the following beneficial effects: This mold does not require pre-embedded bolts. Through the cooperation of side support plates, support plates and spiral drive structure, it can quickly support and dismantle the arc-shaped well wall template. It avoids the problems of cumbersome operation of pre-embedded bolts, difficult template dismantling and non-recyclability, greatly reducing construction difficulty, shortening working time and improving construction efficiency. The mold uses a multi-locking structure to ensure no displacement during the pouring process, guaranteeing the quality of the adjusting layer concrete. The telescopic rod can be flexibly extended and retracted to adapt to the pouring needs of adjusting layers for circular inspection wells of different diameters, making it highly versatile. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the bottom view of the structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of a portion of the image; Figure 4 This is a schematic diagram of the connection of the annular template structure of the present invention; Figure 5 This is an exploded view of the support structure connection of the present invention; Figure 6 This is a schematic diagram of the spiral groove outer rod structure connection of the present invention; Figure 7 For the present invention Figure 6 A magnified view of a portion of the image; Figure 8 This is a schematic diagram of the spiral inner rod structure connection of the present invention; Figure 9 This is an exploded view of the T-shaped sliding plate structure of the present invention. Figure 10 This is a diagram showing the layout of the adjustment layer for a circular inspection well cover.

[0018] In the diagram: 1. Ring template 101, inner ring template 102, outer ring template 102, reinforcing horizontal plate 103, spiral groove outer rod 2, fixing rod 201, telescopic rod 202, guide groove 203, guide block 204, side support plate 205, support plate 206, spiral inner rod 3, first frustum 301, rotating ring 302, push-pull rod 303, rotating ring handle 304, limiting hole 305, multi-stage spiral lifting support rod 4, rubber mat 401, second frustum 402 403 U-shaped support plate, 5 upright pole, 501 anti-detachment baffle, 502 limiting slide groove, 503 collar, 504 limiting block, 505 transverse connecting rod, 6 L-shaped bracket, 601 T-shaped slide groove, 602 T-shaped sliding plate, 603 limiting post, 604 trapezoidal slide groove, 605 trapezoidal slider, 606 L-shaped limiting plate, 607 rotating plate, 608 stop block, 609 screw, 610 limiting piece, 611 hand-tightening nut, 612 retaining ring, 613 retaining block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-9 This invention provides a technical solution: a cast-in-place concrete mold for the adjusting layer of a circular inspection well cover, comprising: an annular template 1, wherein the annular template 1 is composed of multiple reinforcing horizontal plates 103 welded to the top of an inner ring template 101 and an outer ring template 102; a spiral groove outer rod 2, wherein the spiral groove outer rod 2 is erected at the center of the annular template 1, and a spiral inner rod 3 is threadedly connected to the center of the top of the spiral groove outer rod 2, and an L-shaped bracket 6 is connected to the peripheral wall of the spiral groove outer rod 2; and a multi-stage spiral lifting support rod 4, wherein the multi-stage spiral lifting support rod 4 is erected at the bottom of the annular template 1, and three multi-stage spiral lifting support rods 4 are equidistantly distributed in a ring around the periphery of the upright rod 5.

[0021] The ring template 1 is composed of multiple reinforcing horizontal plates 103 welded to the top of the inner ring template 101 and the outer ring template 102. The reinforcing horizontal plates 103 enhance the connection between the inner ring template 101 and the outer ring template 102, forming a stable pouring cavity. The height of the inner ring template 101 is greater than that of the outer ring template 102, which is suitable for the shape requirements of the adjustment layer concrete pouring.

[0022] The bottom peripheral wall of the spiral groove outer rod 2 is provided with six fixed rods 201 connected in a ring at equal intervals. The ends of the fixed rods 201 are movably sleeved with telescopic rods 202. The top wall of the fixed rods 201 is provided with guide grooves 203. The side wall of the telescopic rods 202 is connected with guide blocks 204, which are movably engaged in the guide grooves 203.

[0023] The telescopic rod 202 is movably sleeved at the end of the fixed rod 201. A guide groove 203 is provided on the top wall. The guide block 204 connected to the side wall of the telescopic rod 202 is movably engaged in the guide groove 203. Through the cooperation between the guide block and the guide groove, the telescopic rod 202 can be smoothly extended and retracted along the fixed rod 201.

[0024] The outer end wall of the telescopic rod 202 is connected to a side support plate 205, and a support plate 206 is connected to the side wall of the side support plate 205. Both the side support plate 205 and the support plate 206 are arc-shaped. The height of the inner ring template 101 is greater than the height of the outer ring template 102. The end of the support plate 206 supports and fits against the bottom wall of the inner ring template 101, and the side wall of the side support plate 205 fits against the inner side wall of the inner ring template 101.

[0025] The outer end wall of the telescopic rod 202 is connected to the side support plate 205, and the side wall of the side support plate 205 is connected to the support plate 206. Both are arc-shaped and adapted to the arc-shaped structure of the inner ring template 101. The end of the support plate 206 supports and fits against the bottom wall of the inner ring template 101, and the side wall of the side support plate 205 fits against the inner side wall of the inner ring template 101, together achieving precise positioning and stable support for the ring template 1.

[0026] The top end of the spiral inner rod 3 is connected to a first frustum 301, and a rotating ring 302 is rotatably connected to the periphery of the first frustum 301. Push-pull rods 303 are rotatably connected to the periphery of the rotating ring 302 at equal intervals. The other end of the push-pull rods 303 is rotatably connected to the guide block 204.

[0027] The top of the inner spiral rod 3 is connected to the first truncated cone 301. The circumference of the first truncated cone 301 is rotatably connected to the rotating ring 302. Six push-pull rods 303 are rotatably connected at equal intervals on the circumference of the rotating ring 302. The other end of the push-pull rods 303 is rotatably connected to the guide block 204, so as to realize the adjustment of the height position of the inner spiral rod 3 along the outer spiral groove 2, thereby pushing the telescopic rod 202 to extend and retract along the fixed rod 201.

[0028] A rubber mat 401 is connected to the bottom wall of the multi-stage spiral lifting support rod 4, and a second truncated cone 402 is connected to the top of the multi-stage spiral lifting support rod 4. Anti-slip ridges are provided on the periphery of the second truncated cone 402, and a U-shaped support plate 403 is rotatably connected to the center of the top of the second truncated cone 402. The telescopic rod 202 is snapped into the groove of the U-shaped support plate 403.

[0029] The multi-stage spiral lifting support rod 4 is mounted on the bottom of the annular template 1, with three rods evenly distributed around the perimeter of the upright rod 5. The bottom wall of the rod is connected to a rubber mat 401 to improve the stability of the support and avoid damage to the base layer at the bottom of the well. The top is connected to a second truncated cone 402, which has anti-slip ridges on its perimeter wall to facilitate the adjustment of the height of the multi-stage spiral lifting support rod 4 by rotating the second truncated cone 402. The top center of the second truncated cone 402 is rotatably connected to a U-shaped support plate 403, and the telescopic rod 202 is engaged in the groove of the U-shaped support plate 403 to provide auxiliary support for the telescopic rod 202.

[0030] Both ends of the upright 5 are connected to anti-detachment baffles 501. Three limiting grooves 502 are equidistantly arranged in a ring on the periphery of the upright 5. Three collars 503 are sequentially fitted on the periphery of the upright 5. Limiting blocks 504 are connected to the inner wall of the collars 503. The limiting blocks 504 are movably engaged in the limiting grooves 502. The periphery of the collars 503 is fixedly connected to the multi-stage spiral lifting support rod 4 through a transverse connecting rod 505.

[0031] The limiting block 504 connected to the inner wall of the collar 503 is movably engaged in the limiting slide groove 502. The periphery of the collar 503 is fixedly connected to the multi-stage spiral lifting support rod 4 through the transverse connecting rod 505, ensuring the verticality and stability of the multi-stage spiral lifting support rod 4 during the lifting process. When encountering unevenness at the bottom of the inspection well, the multi-stage spiral lifting support rod 4, together with the transverse connecting rod 505 and the collar 503, can be moved up and down along the upright 5 for adjustment. The three multi-stage spiral lifting support rods 4 are placed in a triangular position around the upright 5.

[0032] A rotating ring handle 304 is connected to the center of the top of the first truncated cone 301. Multiple limiting holes 305 are equidistantly arranged in a ring on the end wall of the rotating ring handle 304. A T-shaped slide groove 601 is provided on the side wall of the L-shaped bracket 6. A T-shaped slide plate 602 is movably engaged in the T-shaped slide groove 601. The T-shaped slide plate 602 is movably arranged above the rotating ring handle 304. A limiting post 603 is connected to the bottom wall of the T-shaped slide plate 602. The limiting post 603 is inserted into the limiting hole 305.

[0033] The T-shaped slide plate 602 is located above the rotating ring handle 304. The limiting post 603 connected to the bottom wall can be inserted into the limiting hole 305 to limit and fix the rotating ring handle 304, thereby ensuring that the telescopic rod 202 is fixed in its telescopic position.

[0034] The T-shaped slide plate 602 has a trapezoidal groove 604 on its side wall. A trapezoidal slider 605 is movably engaged in the trapezoidal groove 604. An L-shaped limiting plate 606 is connected to the bottom wall of the trapezoidal slider 605. The inner bottom wall of the L-shaped limiting plate 606 is attached to the bottom wall of the rotating ring handle 304, and the top wall of the L-shaped limiting plate 606 is attached to the bottom wall of the T-shaped slide plate 602.

[0035] Trapezoidal slide 604 is movable and engages with trapezoidal slider 605. The bottom wall of trapezoidal slider 605 is connected to L-shaped limiting plate 606. The inner bottom wall of L-shaped limiting plate 606 is in contact with the bottom wall of rotating ring handle 304, preventing the limiting post 603 of T-shaped slide plate 602 from separating from limiting hole 305, and further enhancing the locking effect.

[0036] The top of the T-shaped slide plate 602 is rotatably connected to a rotating plate 607. A stop block 608 is connected to the side wall of the rotating plate 607. The stop block 608 is movably disposed in the trapezoidal slide groove 604. The side wall of the stop block 608 abuts against and fits against the trapezoidal slider 605.

[0037] A screw 609 is connected to the outer end of the rotating plate 607, and a limit piece 610 is connected to the other end of the screw 609. A hand-tightening nut 611 is threaded onto the screw 609. The hand-tightening nut 611 is movably disposed within the trapezoidal slide groove 604. A retaining ring 612 is connected to the end wall of the hand-tightening nut 611, and a retaining block 613 is connected to the side wall of the trapezoidal slide groove 604. The retaining block 613 abuts against and fits against the inner wall of the retaining ring 612.

[0038] A hand-tightening nut 611 is threaded onto the screw 609. A limiting piece 610 prevents the hand-tightening nut 611 from coming off. The hand-tightening nut 611 is movably set inside the trapezoidal slide groove 604. A retaining ring 612 is connected to the end wall. A retaining block 613 connected to the side wall of the trapezoidal slide groove 604 abuts against and fits against the inner wall of the retaining ring 612. The position of the rotating plate 607 is fixed by tightening the hand-tightening nut 611. The side wall of the stop block 608 abuts against and fits against the trapezoidal slider 605 to fix the position of the trapezoidal slider 605, thereby preventing the L-shaped limiting plate 606 from separating from the bottom wall of the rotating ring handle 304.

[0039] Working principle: The bottom support system is formed by the upright pole 5 and the multi-stage spiral lifting support rod 4. The upright pole 5 is placed at the center of the bottom of the circular inspection well, and the rubber mat 401 is tightly attached to the bottom base. When the bottom of the inspection well is uneven, the height of the multi-stage spiral lifting support rod 4 is adjusted by the collar 503 and the horizontal connecting rod 505 to keep the multi-stage spiral lifting support rod 4 upright and parallel to each other. Then, the spiral groove outer rod 2 is placed directly above the upright pole 5, so that the three telescopic rods 202 are respectively inserted into the grooves of the three U-shaped support plates 403, completing the assembly of the central support structure. Rotating the rotating ring handle 304 drives the spiral inner rod 3 to rise and fall along the spiral groove outer rod 2, pushing... Pull rod 303 pulls or pushes guide block 204, causing telescopic rod 202 to extend and retract along fixed rod 201, thereby driving side support plate 205 and support plate 206 to adjust their positions; until the end of support plate 206 is in contact with the inner wall of circular inspection well, move T-shaped slide plate 602 downward, so that limit post 603 is inserted into the corresponding limit hole 305 of rotating ring handle 304, move trapezoidal slider 605, so that L-shaped limit plate 606 is in contact with the lower surface of rotating ring handle 304, rotate rotating plate 607 so that stop block 608 blocks trapezoidal slider 605, tighten hand nut 611, and fix trapezoidal slider 605 through the cooperation of retaining ring 612 and retaining block 613, thus completing the locking of the entire mold. Hoist the ring template 1 to the designated position, so that the inner ring template 101 fits against the side wall of the side support plate 205, and the support plate 206 supports the bottom wall of the inner ring template 101. After ensuring that the installation position of the ring template 1 is consistent with the design elevation, the concrete pouring work of the adjusting layer of the circular inspection well cover can be carried out. After the concrete reaches the design strength, the ring template 1, the spiral groove outer rod 2 and the multi-stage spiral lifting support rod 4 are removed in sequence. Then the mold can be removed and transferred to the next construction position.

[0040] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A cast-in-place concrete mold for the adjusting layer of a circular inspection well cover, comprising: The annular template (1) is composed of multiple reinforcing horizontal plates (103) welded to the top of the inner ring template (101) and the outer ring template (102); Spiral groove outer rod (2), the spiral groove outer rod (2) is erected at the center of the annular template (1), the spiral groove outer rod (2) is threadedly connected to the center of the top of the spiral groove outer rod (2) and an L-shaped bracket (6) is connected to the peripheral wall of the spiral groove outer rod (2). Multi-stage spiral lifting support rod (4) is erected at the bottom of the annular template (1). Three multi-stage spiral lifting support rods (4) are equidistantly distributed in a ring around the upright (5).

2. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 1, characterized in that: The spiral groove outer rod (2) has six fixed rods (201) connected in an equidistant ring on the bottom peripheral wall. The ends of the fixed rods (201) are movably fitted with telescopic rods (202). The top wall of the fixed rods (201) has a guide groove (203). The side wall of the telescopic rods (202) is connected with a guide block (204). The guide block (204) is movably engaged in the guide groove (203).

3. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 2, characterized in that: The telescopic rod (202) is connected to a side support plate (205) on its outer end wall. A support plate (206) is connected to the side wall of the side support plate (205). Both the side support plate (205) and the support plate (206) are arc-shaped. The height of the inner ring template (101) is greater than the height of the outer ring template (102). The end of the support plate (206) supports and fits against the bottom wall of the inner ring template (101). The side wall of the side support plate (205) fits against the inner side wall of the inner ring template (101).

4. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 1, characterized in that: The top end of the spiral inner rod (3) is connected to a first truncated cone (301), and a rotating ring (302) is rotatably connected to the periphery of the first truncated cone (301). A push-pull rod (303) is rotatably connected to the periphery of the rotating ring (302) at equal intervals. The other end of the push-pull rod (303) is rotatably connected to the guide block (204).

5. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 1, characterized in that: The bottom wall of the multi-stage spiral lifting support rod (4) is connected to a rubber mat (401), and the top of the multi-stage spiral lifting support rod (4) is connected to a second truncated cone (402). The periphery of the second truncated cone (402) is provided with anti-slip ridges, and the center of the top of the second truncated cone (402) is rotatably connected to a U-shaped support plate (403). The telescopic rod (202) is snapped into the groove of the U-shaped support plate (403).

6. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 1, characterized in that: The upright (5) is equipped with anti-detachment baffles (501) at both the upper and lower ends. Three limiting grooves (502) are equidistantly arranged in a ring on the periphery of the upright (5). Three collars (503) are sequentially fitted on the periphery of the upright (5). A limiting block (504) is connected to the inner wall of the collar (503). The limiting block (504) is movably engaged in the limiting groove (502). The periphery of the collar (503) is fixedly connected to the multi-stage spiral lifting support rod (4) through a transverse connecting rod (505).

7. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 4, characterized in that: The first truncated cone (301) has a rotating ring handle (304) connected to the center of its top end. Multiple limiting holes (305) are equidistantly arranged on the end wall of the rotating ring handle (304). A T-shaped slide groove (601) is provided on the side wall of the L-shaped bracket (6). A T-shaped slide plate (602) is movably engaged in the T-shaped slide groove (601). The T-shaped slide plate (602) is movably arranged above the rotating ring handle (304). A limiting post (603) is connected to the bottom wall of the T-shaped slide plate (602). The limiting post (603) is inserted into the limiting hole (305).

8. The cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 7, characterized in that: The T-shaped slide plate (602) has a trapezoidal groove (604) on its side wall. A trapezoidal slider (605) is movably engaged in the trapezoidal groove (604). An L-shaped limiting plate (606) is connected to the bottom wall of the trapezoidal slider (605). The bottom wall of the L-shaped limiting plate (606) is attached to the bottom wall of the rotating ring handle (304), and the top wall of the L-shaped limiting plate (606) is attached to the bottom wall of the T-shaped slide plate (602).

9. A cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 8, characterized in that: The top of the T-shaped slide plate (602) is rotatably connected to a rotating plate (607), and a stop block (608) is connected to the side wall of the rotating plate (607). The stop block (608) is movably disposed in the trapezoidal slide groove (604), and the side wall of the stop block (608) abuts against and fits the trapezoidal slider (605).

10. A cast-in-place concrete mold for the adjusting layer of a circular inspection well cover according to claim 9, characterized in that: The outer end of the rotating plate (607) is connected to a screw (609), and the other end of the screw (609) is connected to a limiting piece (610). A hand-tightening nut (611) is threaded onto the screw (609). The hand-tightening nut (611) is movably disposed in the trapezoidal slide groove (604). A retaining ring (612) is connected to the end wall of the hand-tightening nut (611), and a retaining block (613) is connected to the side wall of the trapezoidal slide groove (604). The retaining block (613) abuts against and fits against the inner wall of the retaining ring (612).

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