Inspection well inner mold convenient to demold and inspection well mold

Abstract

The utility model belongs to the technical field of inspection well moulds, and particularly relates to an inspection well inner mould convenient to demould and an inspection well mould, the inspection well inner mould convenient to demould comprises a large arc-shaped body, a top cover and a bottom cover, the large arc-shaped body is provided with a notch, a small arc-shaped body is arranged on the notch, a vertical rod is arranged in the inner mould, and the top cover is arranged on the vertical rod. A contraction assembly is further arranged in the inner mold, one end of the contraction assembly is hinged to the inner side wall of the small arc-shaped body, and the other end of the contraction assembly is hinged to the vertical rod. After the inspection well is formed, the rotating rod is rotated, the vertical rod rotates to drive the contraction assembly to move towards one side, the small arc-shaped body is pulled to move inwards, the small arc-shaped body drives the side wall of the notch of the large arc-shaped body to contract inwards, a gap is formed between the inner mold and the inspection well, and the inner mold and the inspection well can be conveniently and rapidly separated. And the rotating rod is reversely rotated to restore the inner mold. Operation is simple and efficient, damage to the inspection well is reduced, and the demolding efficiency of the inner mold and the forming quality of the inspection well are improved.

Description

Technical Field

[0001] This utility model belongs to the field of manhole mold technology, and particularly relates to a manhole inner mold and manhole mold that are easy to demold. Background Technology

[0002] In urban infrastructure construction, a large number of precast concrete components are needed, the most common being inspection wells, also known as storm drains or sedimentation wells. Currently, most precast assembly structures are used, transferring on-site work from traditional construction methods to factory prefabrication using precast molds. This not only reduces work time and construction difficulty on the building site but also ensures construction safety and improves efficiency. The mold consists of an inner mold and an outer mold. Concrete is poured into the forming cavity formed by the inner and outer molds. After the concrete stabilizes and solidifies, the mold is opened to remove the finished product. However, because the finished product is tightly attached to the outer surface of the inner mold without any gap, separating the inner mold from the finished product is relatively difficult.

[0003] For example, Chinese patent document CN220058100U discloses a standardized steel template for reinforcing manholes under roadways, including an outer mold and an inner mold. The outer mold is an open, thin-walled cylindrical shape with vertical joints on its side walls. Two outer mold steel purlins are symmetrically arranged on both sides with the diameter of the joint as the center line. The outer mold steel purlins are U-shaped with their openings facing downwards. The two vertical parts are welded and fixed to the outer wall of the outer mold, and the horizontal part is horizontally supported above the outer mold. The two outer mold steel purlins are connected and fixed at the joint by bolts to close the outer mold. The inner mold is a closed, thin-walled cylindrical shape, and the inner mold is concentric with the outer mold. The diameter of the inner mold is smaller than that of the outer mold. The space between the outer wall of the inner mold and the inner wall of the outer mold is used for pouring concrete.

[0004] In the aforementioned patent document's technical solution, the outer mold is opened and closed by bolts, while the inner mold is a closed, thin-walled cylindrical shape with two inverted U-shaped inner mold purlins inside. During demolding, the inner mold can only be separated from the inspection well by hoisting the purlins. However, because the two are tightly attached, forcibly separating the inner mold can easily damage the inner wall of the inspection well, reducing the molding quality of the inspection well. Utility Model Content

[0005] The purpose of this utility model is to provide an inner mold and mold for manholes that are easy to demold, thereby solving the problems that existing inner molds are difficult to demold, easily damage the manholes, and affect the quality of the finished manholes.

[0006] To achieve the above objectives, this utility model provides an easy-to-demold manhole inner mold, which is detachably connected to the inner cavity of the outer mold. It includes a large arc-shaped body, a top cover, and a bottom cover. The large arc-shaped body has a notch, and a small arc-shaped body is provided on the notch. A vertical rod is provided inside the inner mold. The upper end of the vertical rod extends out of the top surface of the top cover and is connected to a rotating rod. A shrinkage assembly is also provided inside the inner mold. One end of the shrinkage assembly is hinged to the inner wall of the small arc-shaped body, and the other end is hinged to the vertical rod.

[0007] Furthermore, the shrinking assembly includes a first connecting piece, a transverse connecting piece, and a second connecting piece. One end of the first connecting piece is fixed to the outer periphery of the upright, and the other end is hinged to the transverse connecting piece. The other end of the transverse connecting piece is hinged to the second connecting piece, and the other end of the second connecting piece is fixed to the inner sidewall of the small arc-shaped body.

[0008] Furthermore, the second connecting piece is also hinged to a third connecting piece, the other end of which is connected to the inner sidewall next to the notch of the large arc-shaped body.

[0009] Furthermore, the small arc-shaped body has two layers, including an outer plate, an inner plate, and multiple side plates. The outer plate is located at the notch of the large arc-shaped body and is connected to the inner plate through the side plates. The inner plate is also connected to the inner sidewall next to the notch of the large arc-shaped body through the side plates.

[0010] Furthermore, the top surface of the bottom cover is provided with a closed limiting frame, the outer diameter of the limiting frame is smaller than the outer diameter of the bottom cover, and the inner side of the limiting frame is provided with reinforcing ribs.

[0011] Furthermore, the bottom of the small arc-shaped body and the large arc-shaped body extends inward with several arc-shaped base plates, and there are clearance gaps between each arc-shaped base plate. The arc-shaped base plates are located on the top surface of the bottom cover.

[0012] Furthermore, the outer wall of the limiting frame is provided with a support frame, the support frame is connected to a ring, and there is a gap between the ring and the inner wall of the large arc-shaped body.

[0013] The above-mentioned technical solutions in the easy-to-demold inspection well inner mold provided by this utility model embodiment have at least the following technical effects:

[0014] After the manhole is formed, the rotating rod is rotated, causing the upright to rotate and move the shrinking component to one side. The shrinking component pulls the small arc-shaped body inward, while the small arc-shaped body causes the sidewall next to the notch of the large arc-shaped body to shrink inward, creating a gap between the inner mold and the manhole. As the rotation angle increases, the gap also increases. Then, the inner mold is hoisted to quickly separate it from the manhole. The rotating rod is rotated in the opposite direction to restore the inner mold, which can be reused. The operation is simple and efficient, reduces damage to the manhole, and improves the demolding efficiency of the inner mold and the forming quality of the manhole.

[0015] A manhole mold includes an inner manhole mold, an outer mold, and a base plate. The top cover of the inner mold extends outward with two or more support arms. The free ends of the support arms are provided with fixed shafts. The outer wall of the outer mold is hinged with a buckle, which engages with the fixed shaft, so that the inner mold is suspended in the inner cavity of the outer mold. The outer mold is formed by splicing one side of a single circular mold body, or by splicing two or more arc-shaped mold bodies. A quick-closing locking assembly is provided at the splice. The base plate is located at the bottom of the outer mold, and a quick-release assembly is provided at the lower end of the outer wall of the outer mold. The quick-release assembly is detachably connected to the base plate.

[0016] Furthermore, the lower end of the outer sidewall of the outer mold is provided with a radially extending stepped annular boss, and the quick-release assembly is disposed on the annular boss.

[0017] Furthermore, a support ring is provided between the inner wall of the outer mold and the outer wall of the inner mold.

[0018] The inspection well mold provided in this embodiment of the present invention has at least the following technical effects:

[0019] A base plate is installed below the outer mold, and the inner mold is suspended and fixed inside the outer mold by a support arm. This forms a manhole forming cavity with a base between the inner and outer molds. Pouring concrete into the forming cavity allows for one-time molding of the manhole, improving molding efficiency and quality. Furthermore, the outer mold can be quickly opened and closed via a locking assembly, and the outer mold and base plate are detachably connected via a quick-release assembly, enabling rapid demolding of the outer mold and manhole. Buckles and a fixing shaft work together to quickly position and unlock the support arm and outer mold, while a retraction assembly allows for rapid demolding of the inner mold and manhole, facilitating the removal of the finished product. This enhances manhole production efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A perspective view of an inspection well inner mold that is easy to demold, provided for an embodiment of this utility model.

[0022] Figure 2 A cross-sectional view of the manhole inner mold for easy demolding provided in an embodiment of this utility model.

[0023] Figure 3 A cross-sectional view of the manhole inner mold for easy demolding provided in an embodiment of this utility model.

[0024] Figure 4 Another cross-sectional view of the inspection well inner mold that facilitates demolding, provided for an embodiment of this utility model.

[0025] Figure 5 A perspective view of the manhole mold provided in an embodiment of this utility model.

[0026] Figure 6 The inspection well mold provided for the embodiments of this utility model Figure 5 A magnified view of A in the middle.

[0027] Figure 7 The structural diagram of the base plate and quick-release assembly of the inspection well mold provided in the embodiment of this utility model.

[0028] Figure 8 This is a structural diagram of the fifth connecting piece of the quick-release assembly of the inspection well mold provided in this embodiment of the utility model.

[0029] Figure 9 A perspective view of another embodiment of the outer mold of the manhole mold provided in this utility model.

[0030] Figure 10 A cross-sectional view of the manhole mold provided in an embodiment of this utility model.

[0031] In the diagram, 100 is the inner mold, 110 is the large arc-shaped body, 111 is the arc-shaped bottom plate, 112 is the clearance notch, 120 is the top cover, 130 is the bottom cover, 131 is the limiting frame, 132 is the reinforcing rib, 133 is the support frame, 134 is the ring, 140 is the small arc-shaped body, 141 is the outer plate, 142 is the inner plate, 143 is the side plate, 150 is the shrinking assembly, 151 is the first connecting piece, 152 is the transverse connecting piece, 153 is the second connecting piece, 154 is the third connecting piece, 155 is the inclined plate, 156 is the fourth connecting piece, 160 is the upright, 161 is the rotating rod, 170 is the support arm, and 171 is the fixed shaft.

[0032] 200, outer mold; 210, snap fastener; 220, annular boss; 230, support ring; 240, first side plate; 250, second side plate; 260, flange annular plate.

[0033] 300. Locking assembly; 310. Fixing base; 320. Connecting base; 321. Horizontal plate; 330. Vertical rod; 331. First swing arm; 340. Push block; 350. Limiting piece; 351. Arc groove; 360. Horizontal bar.

[0034] 400. Quick-release assembly; 410. Bracket; 420. Pulse; 430. Fifth connecting piece; 431. Slot; 432. Hook; 433. Groove.

[0035] 500. Base plate; 510. Sealing plate; 520. Circular frame; 530. Mounting base; 531. Mounting plate; 532. Connecting shaft. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0037] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0040] In one embodiment of the easy-to-demold manhole inner mold of this utility model, please refer to... Figures 1 to 4The manhole inner mold, which is easy to demold, is detachably connected to the inner cavity of the outer mold 200. It includes a large arc-shaped body 110, a top cover 120, and a bottom cover 130. The large arc-shaped body 110 has a notch, and a small arc-shaped body 140 is provided on the notch. A vertical rod 160 is provided inside the inner mold 100. The upper end of the vertical rod 160 extends out of the top surface of the top cover 120 and is connected to a rotating rod 161. A shrinkage assembly 150 is also provided inside the inner mold 100. One end of the shrinkage assembly 150 is hinged to the inner side wall of the small arc-shaped body 140, and the other end is hinged to the vertical rod 160. Specifically, after the inspection well is formed, rotating the rotating rod 161 causes the upright rod 160 to rotate, moving the shrinking component 150 to one side. The shrinking component 150 pulls the small arc-shaped body 140 inward, while the small arc-shaped body 140 causes the sidewall next to the notch of the large arc-shaped body 110 to shrink inward, creating a gap between the inner mold 100 and the inspection well. As the rotation angle increases, the gap also increases. Then, the inner mold 100 is hoisted to quickly separate it from the inspection well. Rotating the rotating rod 161 in the opposite direction restores the inner mold, allowing it to be reused. The operation is simple and efficient, reduces damage to the inspection well, and improves the demolding efficiency of the inner mold 100 and the forming quality of the inspection well.

[0041] Further, please refer to Figure 1 The upright 160 is located on the side of the large arc-shaped body 110 away from the small arc-shaped body 140, and the top cover at the top of the inner mold is flat, inclined, or conical. Specifically, the upright 160 being located on the opposite side of the small arc-shaped body allows the sidewall of the large arc-shaped body 110 to contract inward over a large range. The conical design of the top cover guides the concrete flow and prevents a large amount of concrete from accumulating on the top cover 120.

[0042] Further, please refer to Figure 2 Multiple retraction components 150 are axially spaced on the upright 160. Specifically, these components enhance the tension on the small arc-shaped body 140, thereby improving retraction efficiency.

[0043] For further details, please refer to... Figure 2 and Figure 3 The retraction assembly 150 includes a first connecting piece 151, a transverse connecting piece 152, and a second connecting piece 153. One end of the first connecting piece 151 is fixed to the outer periphery of the upright 160, and the other end is hinged to the transverse connecting piece 152. The other end of the transverse connecting piece 152 is hinged to the second connecting piece 153, and the other end of the second connecting piece 153 is fixed to the inner sidewall of the small arc-shaped body 140. Specifically, rotating the rotating rod 161 causes the upright 160 to rotate, pulling the transverse connecting piece 152 in the direction of rotation of the first connecting piece 151, and then pulling the second connecting piece 153 in the opposite direction, thereby causing the small arc-shaped body 140 to move inward and the large arc-shaped body 150 to retract inward.

[0044] For further details, please refer to... Figure 3The second connecting piece 153 is also hinged to the third connecting piece 154, the other end of which is connected to the inner wall next to the notch of the large arc-shaped body 110. Specifically, when the small arc-shaped body 140 moves inward, the third connecting piece 154 directly pulls the large arc-shaped body 110 inward to increase the pulling force and prevent cracks from occurring at the connection between the small arc-shaped body 140 and the large arc-shaped body 110 due to excessive pulling force.

[0045] Furthermore, the third connecting piece 154 includes an inclined plate 155 fixed to the inner wall of the large arc-shaped body 110 and a fourth connecting piece 156. The inclined plate 155 is hinged to the fourth connecting piece 156, and the fourth connecting piece 156 is hinged to the second connecting piece 153. Specifically, this enhances the structural strength and restricts the range of motion of the fourth connecting piece 156, reducing deformation.

[0046] For further details, please refer to... Figure 3 The small arc-shaped body 140 has two layers, including an outer plate 141, an inner plate 142, and multiple side plates 143. The outer plate 141 is located at the notch of the large arc-shaped body 110 and is connected to the inner plate 142 through the side plates 143. The inner plate 142 is also connected to the inner sidewall next to the notch of the large arc-shaped body 110 through the side plates 143. Specifically, the second connecting piece 153 connects to the inner plate 142. The structural strength of the double-layered small arc-shaped body 140 is increased, and the side plates 143 further enhance the connection stability between the small arc-shaped body 140 and the large arc-shaped body 110, accelerating shrinkage and recovery.

[0047] For further details, please refer to... Figure 2 and Figure 4 The bottom cover 130 has a closed limiting frame 131 on its top surface. The outer diameter of the limiting frame 131 is smaller than the outer diameter of the bottom cover 130, and the inner side of the limiting frame 131 has a reinforcing rib 132. Specifically, the limiting frame 131 and the reinforcing rib 132 enhance the structural strength of the bottom cover 130 to prevent deformation of the bottom cover 130. They also limit the degree of inward shrinkage of the inner mold 100.

[0048] Further, please refer to Figure 4 The limiting frame 131 is a D-shaped arc frame, with the flat part facing the small arc body 140.

[0049] For further details, please refer to... Figure 4 The small arc-shaped body 140 and the large arc-shaped body 110 have several arc-shaped base plates 111 extending inward from their bottoms. Each arc-shaped base plate 111 has a clearance notch 112 between it. The arc-shaped base plates 111 are located on the top surface of the bottom cover 130. Specifically, the clearance notch 112 allows the arc-shaped base plates to contract and bend inward, reducing demolding resistance.

[0050] For further details, please refer to... Figure 4The outer wall of the limiting frame 131 is provided with a support frame 133, which is connected to a ring 134. There is a gap between the ring 134 and the inner wall of the large arc-shaped body 110. Specifically, the ring 134 reduces the friction of the arc-shaped base plate 111 due to contraction and movement, allowing it to move smoothly, and abuts against the inner wall of the large arc-shaped body 110, limiting its deformation.

[0051] In another embodiment of the manhole mold of this utility model, please refer to Figures 5 to 10 The manhole mold includes an inner manhole mold 100, an outer mold 200, and a base plate 500. The top cover 120 of the inner mold extends outward with two or more support arms 170. The free ends of the support arms 170 are provided with fixed shafts 171. The outer wall of the outer mold 200 is hinged with a buckle 210, which engages with the fixed shaft 171, so that the inner mold 100 is suspended in the inner cavity of the outer mold 200. The outer mold 200 is formed by splicing one side of a whole circular mold body, or by splicing two or more arc-shaped mold bodies. The splice is provided with a quick-closing locking component 300. The base plate 500 is located at the bottom of the outer mold 200. The lower end of the outer wall of the outer mold 200 is provided with a quick-release component 400, which is detachably connected to the base plate 500. Specifically, a base plate 500 is provided below the outer mold 200, and the inner mold 100 is suspended and fixed inside the outer mold 200 by a support arm 170. At this time, a manhole forming cavity with a base is formed between the inner mold 100 and the outer mold 200. Concrete is poured into the forming cavity to form the manhole in one step, improving the forming efficiency and quality of the manhole. In addition, the outer mold 200 can be quickly opened and closed by the locking assembly 300, and the outer mold 200 and the base plate 500 are detachably connected by the quick-release assembly 400, realizing the quick demolding of the outer mold 200 and the manhole. The buckle 210 cooperates with the fixed shaft 171 to realize the quick positioning and unlocking of the support arm 170 and the outer mold 200, and the shrinking assembly 150 realizes the quick demolding of the inner mold 100 and the manhole, which is convenient for removing the finished product. This improves the production efficiency of manholes.

[0052] Further, please refer to Figure 6The locking assembly 300 includes a fixed base 310, a connecting base 320, a horizontal bar 360, a limiting piece 350, a push block 340, a vertical bar 330, and a first swing arm 331. The fixed base 310 is located on the first side plate 240 of the arc-shaped mold body, and the connecting base 320 is located on the second side plate 250 of the adjacent arc-shaped mold body. It includes two horizontal plates 321 arranged vertically. The vertical bar 330 passes through the horizontal plates 321 and is rotatably connected to them. The top end of the vertical bar 330 is connected to the first swing arm 331, and the middle part is fixedly connected to the push block 340. The other end of the push block 340 is away from the second side plate 250 and is hinged to the limiting piece 350. The limiting piece 350 is fixedly connected to the fixed base 310 through the horizontal bar 360. An arc-shaped groove 351 is provided on one side of the limiting piece 350. The vertical bar 330 is embedded in the arc-shaped groove 351. Specifically, when the outer mold 200 is in the closed state, the vertical rod 330 is embedded in the limiting groove 351. The limiting groove 351 is used to restrict the vertical rod 330, preventing the concrete pouring in the molding cavity from putting pressure on the outer mold 200 and causing the vertical rod 330 to loosen and open the outer mold 200. When the outer mold 200 changes from the open state to the closed state, the arc design can guide the vertical rod 460 into the limiting groove 441. To change the outer mold 200 from the closed state to the open state, the first swing arm 331 needs to be rotated towards the fixed seat 310, which drives the vertical rod 330 and the push block 340 to rotate together. The other end of the push block 340 makes a circular motion around the vertical rod 330, causing the limiting piece to move towards the first side plate 240. The limiting piece 350 pushes the horizontal rod 360 and the fixed seat 310 to move synchronously, thereby opening the outer mold 200 and completing the rapid demolding. The process will not cause significant damage to the outer surface of the inspection well, thus improving product quality.

[0053] Further, please refer to Figure 7 and Figure 8 The outer mold 200 has a flange annular plate 260 extending radially from its bottom. The base plate 500 includes a sealing plate 510 and a circular frame 520 extending vertically from the bottom surface of the sealing plate 510. The outer diameter of the circular frame 520 is smaller than that of the sealing plate 510. The outer wall of the circular frame 520 is provided with multiple radially extending mounting seats 530. The mounting seat 530 includes two parallel mounting plates 531 and a connecting shaft 532 connecting the two mounting plates 531. The mounting plates 531 support the flange annular plate 260. The quick-release assembly 400 includes a bracket 410, a lever 420, and a fifth connecting piece 430. The bracket 410 is fixed to the lower end of the side wall of the outer mold 200 and the flange ring plate 260. The top is hinged to the lever 420, and the bottom is hinged to the fifth connecting piece 430. The lower end of the fifth connecting piece 430 extends to the outside of the base plate 500 and is provided with a hook 432. The hook 432 engages with the connecting shaft 532. The upper end of the fifth connecting piece 430 is provided with a slot 431 and a groove 433. The groove 433 and the slot 431 are respectively provided on both sides of the upper end of the fifth connecting piece 430. The lever 420 abuts against the slot 431 to lock the base plate 500 and the outer mold 200.

[0054] Specifically, the hook 432 engages with the connecting shaft 532 to initially position the fifth connecting piece 430 against the base plate 500. Then, the lever 420 is rotated downwards until its free end abuts against the slot 431 to fix the fifth connecting piece 430, thereby locking the hook 432 against the base plate 500 and securing the outer mold 200 to the base plate 500. To unlock, the lever 420 is moved upwards to separate it from the fifth connecting piece 430. The fifth connecting piece 430 is then rotated to separate the hook 432 from the base plate 500, unlocking the base plate 500 from the outer mold 200. The fifth connecting piece 430 is then rotated to a horizontal position, with the groove 433 at the top. The lever 420 engages with the groove 433, and the flange ring plate 260 limits the fifth connecting piece 430 to prevent it from loosening and rotating, thus preventing it from re-hooking the connecting shaft 532 and affecting the locking assembly 300's ability to quickly open the outer mold 200.

[0055] For further details, please refer to... Figure 9 The lower end of the outer wall of the outer mold 200 is also provided with a radially extending stepped annular boss 270, and the quick-release assembly 400 is provided on the annular boss 2720. Specifically, the annular boss 2720 makes the outer diameter of the base of the inspection well larger than the outer diameter of the well body, so that inspection wells with bases of different shapes can be made.

[0056] For further details, please refer to... Figure 10 A support ring 230 is also provided between the inner wall of the outer mold 200 and the outer wall of the inner mold 100. Specifically, the bottom surface of the support ring 230 is higher than the bottom surface of the inner mold 100. The support ring 230, the outer mold 200, and the inner mold 100 cooperate to form a vertically penetrating upper chamber or adjustable well forming cavity, so that one mold can form inspection wells with different structures. One type is an inspection well with a base, and the other type is an upper chamber or adjustable well without a base. The support ring is set or the position of the support ring in the forming cavity is adjusted according to actual production needs to make adjustable wells of different heights.

[0057] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A manhole inner mold that is easy to demold, detachably connected to the inner cavity of an outer mold, characterized in that, The device includes a large arc-shaped body, a top cover, and a bottom cover. The large arc-shaped body has a notch, and a small arc-shaped body is provided on the notch. A vertical rod is provided inside the inner mold. The upper end of the vertical rod extends out of the top surface of the top cover and is connected to a rotating rod. A shrinking assembly is also provided inside the inner mold. One end of the shrinking assembly is hinged to the inner wall of the small arc-shaped body, and the other end is hinged to the vertical rod.

2. The manhole inner mold for easy demolding according to claim 1, characterized in that: The shrinking assembly includes a first connecting piece, a transverse connecting piece, and a second connecting piece. One end of the first connecting piece is fixed to the outer periphery of the upright, and the other end is hinged to the transverse connecting piece. The other end of the transverse connecting piece is hinged to the second connecting piece, and the other end of the second connecting piece is fixed to the inner sidewall of the small arc-shaped body.

3. The manhole inner mold for easy demolding according to claim 2, characterized in that: The second connecting piece is also hinged to a third connecting piece, the other end of which is connected to the inner sidewall next to the notch of the large arc-shaped body.

4. The manhole inner mold for easy demolding according to claim 1, characterized in that: The small arc-shaped body has two layers, including an outer plate, an inner plate, and multiple side plates. The outer plate is located at the notch of the large arc-shaped body and is connected to the inner plate through the side plates. The inner plate is also connected to the inner sidewall next to the notch of the large arc-shaped body through the side plates.

5. The manhole inner mold facilitating demolding according to any one of claims 1 to 4, characterized in that: The top surface of the bottom cover is provided with a closed limiting frame, the outer diameter of the limiting frame is smaller than the outer diameter of the bottom cover, and the inner side of the limiting frame is provided with reinforcing ribs.

6. The manhole inner mold for easy demolding according to claim 5, characterized in that: The small and large arc-shaped bodies have several arc-shaped base plates extending inward from their bottoms, with clearance gaps between each arc-shaped base plate, and the arc-shaped base plates are located on the top surface of the bottom cover.

7. The manhole inner mold for easy demolding according to claim 6, characterized in that: The outer wall of the limiting frame is provided with a support frame, the support frame is connected to a ring, and there is a gap between the ring and the inner wall of the large arc-shaped body.

8. A manhole mold, comprising the manhole inner mold according to any one of claims 1 to 7, characterized in that, It also includes an outer mold and a base plate. The inner mold top cover extends outward with two or more support arms. The free end of each support arm is provided with a fixed shaft. The outer side wall of the outer mold is hinged with a buckle. The buckle engages with the fixed shaft, so that the inner mold is suspended in the inner cavity of the outer mold. The outer mold is formed by splicing one side of a whole circular mold body, or by splicing two or more arc-shaped mold bodies. A quick-closing locking component is provided at the splice. The base plate is located at the bottom of the outer mold. A quick-release component is provided at the lower end of the outer side wall of the outer mold. The quick-release component is detachably connected to the base plate.

9. The manhole mold according to claim 8, characterized in that: The lower end of the outer side wall of the outer mold is also provided with a radially extending stepped annular boss, and the quick-release assembly is provided on the annular boss.

10. The manhole mold according to claim 8, characterized in that: A support ring is also provided between the inner wall of the outer mold and the outer wall of the inner mold.

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