A prefabricated circular pipe culvert mold and a prefabricated circular pipe culvert hoisting method

Abstract

The application discloses a prefabricated circular pipe culvert mold and a prefabricated circular pipe culvert hoisting method, and relates to the technical field of bridge and culvert molds. The prefabricated circular pipe culvert mold comprises an inner mold, an outer mold, a base and a plurality of movable base plates. The bottom of the inner mold is detachably fixedly connected to the base. The bottom of the outer mold is detachably fixed to the base. An annular cavity is formed between the outer mold, the inner mold and the base and is used for pouring concrete to form a prefabricated circular pipe culvert. A plurality of open grooves are arranged on the base. The inner end of each open groove extends to the position of the base on the inner side of the inner mold. The outer end of each open groove extends outward to the outer edge of the base. The first end of each movable base plate is rotatably connected to the base at the inner end of the open groove. The second end of each movable base plate is detachably fixedly connected to the base at the outer end of the open groove to seal the open groove. The prefabricated circular pipe culvert can be conveniently hoisted from the mold base and safe construction in the process can be ensured. Secondary construction of the prefabricated circular pipe culvert is avoided, and the workload in the later period is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge and culvert molds, in particular to a prefabricated round pipe culvert mold and a prefabricated round pipe culvert hoisting method. BACKGROUND

[0002] The reinforced concrete round pipe culvert is the most commonly used culvert structure type in roadbed drainage, which has good mechanical properties, simple structure, convenient construction, short construction period and low cost. At present, the reinforced concrete round pipe culvert is the most commonly used culvert structure type in roadbed drainage, which has good mechanical properties, simple structure, convenient construction, short construction period and low cost. In engineering projects, the reinforced concrete round pipe culvert is usually made by vibration method.

[0003] How to hoist the prefabricated round pipe culvert made by vibration method from the mold base to the storage site, the common methods are:

[0004] (1) Directly binding the lifting belt on the outer wall of the round pipe culvert for lifting, the lifting belt is easy to slip off the outer wall of the round pipe culvert, and this method has certain safety hazards.

[0005] (2) Pre-burying a lifting ring at the upper opening position of the round pipe culvert, which needs to cut the pre-buried lifting ring in the later installation, and affects the quality of the concrete at the upper opening of the round pipe culvert.

[0006] (3) Reserving a hoisting hole at the center position of the round pipe culvert, which needs to repair the reserved hole in the later installation, and has a greater impact on the quality of the round pipe culvert. SUMMARY

[0007] The purpose of the present application is to provide a prefabricated round pipe culvert mold and a prefabricated round pipe culvert hoisting method to solve the problems existing in the prior art, facilitate hoisting the prefabricated round pipe culvert from the mold base and ensure safe construction in the process, avoid secondary construction of the prefabricated round pipe culvert, and reduce the workload in the later period.

[0008] To achieve the above purpose, the present application provides the following scheme:

[0009] The present application provides a prefabricated round pipe culvert mold, which comprises an inner mold, an outer mold, a base and a plurality of movable bottom plates, the bottom of the inner mold is detachably fixedly connected to the base, the bottom of the outer mold is detachably fixed to the base, and an annular cavity formed between the outer mold, the inner mold and the base is used for pouring concrete to form a prefabricated round pipe culvert, a plurality of open grooves are arranged on the base, the inner end of the open groove extends to the position of the base inside the inner mold, and the outer end of the open groove extends outward to the outer edge of the base; the first end of the movable bottom plate is rotationally connected with the base at the inner end of the open groove, and the second end of the movable bottom plate is detachably fixedly connected with the base at the outer end of the open groove to seal the open groove.

[0010] Preferably, the outer mold has a first flange on a bottom thereof away from the annular cavity, the inner mold has a second flange on a bottom thereof away from the annular cavity, the first flange is provided with a plurality of first connecting holes, the second flange is provided with a plurality of second connecting holes, the base is provided with a plurality of third connecting holes and a plurality of fourth connecting holes, the third connecting holes are provided corresponding to the first connecting holes, the fourth connecting holes are provided corresponding to the second connecting holes, one first fixing bolt is used to be fixed after penetrating through one first connecting hole and one third connecting hole, and one second fixing bolt is used to be fixed after penetrating through one second connecting hole and one fourth connecting hole.

[0011] Preferably, the outer mold positioning member is fixedly connected with the bottom plate and is used to contact and position a side edge of the first flange away from the annular cavity.

[0012] Preferably, an outer edge of the first flange has the same diameter as an outer edge of the base, the outer mold positioning member is an outer mold positioning steel plate, the outer mold positioning steel plate comprises a connecting portion and a positioning portion, one end of the connecting portion is located below a bottom surface of the base and is fixedly connected with the base, the other end of the connecting portion is fixedly connected with a lower end of the positioning portion, an upper end of the positioning portion protrudes upward beyond a top surface of the base, a bottom of a side edge of the positioning portion close to the base is used to contact an outer edge of the first flange to align the outer edge of the first flange with the outer edge of the base, and a side edge of the positioning portion close to the base gradually moves away from the outer mold plate from bottom to top.

[0013] Preferably, the inner mold positioning steel plate is fixedly connected with the bottom plate and is used to contact and position a side edge of the second flange away from the annular cavity, and the inner mold positioning steel plate is provided with a first hook away from the second flange.

[0014] Preferably, the outer mold comprises a plurality of outer mold plates, each of the outer mold plates is spliced into a cylindrical structure, and each of the outer mold plates is provided correspondingly to at least one of the outer mold positioning members; the inner mold comprises a wedge-shaped quick-release inner mold plate, a first inner mold plate and a second inner mold plate, a cross-sectional area of the wedge-shaped quick-release inner mold plate gradually increases from bottom to top, the wedge-shaped quick-release inner mold plate, the first inner mold plate and the second inner mold plate are spliced into a cylindrical structure, and the wedge-shaped quick-release inner mold plate, the first inner mold plate and the second inner mold plate are respectively provided correspondingly to at least one of the inner mold positioning steel plates, the top of the inner side wall of the first inner mold plate and the second inner mold plate is provided with a second lifting hook, the outer side wall of the outer mold plate is provided with a third lifting hook, and the top of the wedge-shaped quick-release inner mold plate is provided with a fourth lifting hook.

[0015] Preferably, a plurality of lead screws and a plurality of nuts are further included, the top end of the outer mold plate is provided with at least one first through hole, the top end of the wedge-shaped quick-release inner mold plate, the first inner mold plate and the second inner mold plate is provided with at least one second through hole, the second through hole is provided correspondingly to the first through hole, and the two ends of the lead screw protruding out after penetrating through the first through hole and the second through hole are fixed by the nut in a threaded connection.

[0016] Preferably, the base is in a circular ring structure, the number of the movable bottom plates is three and the movable bottom plates are uniformly distributed along the circumference of the base, and the bottom of the base is provided with a foot pad.

[0017] Preferably, a release agent layer is further included, the release agent layer is applied on the outer side wall of the inner mold, the inner side wall of the outer mold and the top of the base and the movable bottom plates located between the inner mold and the outer mold.

[0018] The present application provides a prefabricated circular pipe culvert hoisting method, comprising the following steps:

[0019] S1: using the prefabricated circular pipe culvert mold according to any one of the above to manufacture a prefabricated circular pipe culvert;

[0020] S2: after the inner mold and the outer mold are removed, the second end of the movable bottom plate is detached from the base and is lowered;

[0021] S3: the prefabricated circular pipe culvert is fixed by penetrating into a lifting belt through the opening slot, and the prefabricated circular pipe culvert is hoisted to a storage area.

[0022] The present application has the following technical effects compared with the prior art:

[0023] The application provides a prefabricated circular pipe culvert mold and a prefabricated circular pipe culvert hoisting method, which are characterized by the following: an open groove is arranged on the base, the first end of a movable base plate is rotatably connected to the base at the inner end of the open groove, and the second end of the movable base plate is detachably fixedly connected to the base at the outer end of the open groove to seal the open groove; after the prefabricated circular pipe culvert mold is used to complete the prefabrication of the prefabricated circular pipe culvert and the inner mold and the outer mold are removed, the second end of the movable base plate is detached from the base and falls on the ground, so that the lifting belt of the hoisting machine passes through the open groove and enters the interior of the prefabricated circular pipe culvert, and then passes into the upper opening from the lower part and is lifted to the storage area by the hoisting machine, thereby avoiding the secondary construction of the prefabricated circular pipe culvert, such as pre-burying and pre-reserving a cavity on the circular pipe culvert, reducing the workload in the later stage, effectively improving the construction quality of the circular pipe culvert, and ensuring the construction safety. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0025] Fig. 1 A top view of the prefabricated circular pipe culvert mold provided by the present application;

[0026] Fig. 2 A bottom view of the prefabricated circular pipe culvert mold provided by the present application;

[0027] Fig. 3 A front view of the prefabricated circular pipe culvert mold provided by the present application;

[0028] Fig. 4 A structural schematic view of the connection between the wedge-shaped quick-release inner mold plate and the first inner mold plate and the second inner mold plate in the prefabricated circular pipe culvert mold provided by the present application;

[0029] Fig. 5 A front view of the outer mold positioning steel plate in the prefabricated circular pipe culvert mold provided by the present application;

[0030] Fig. 6 A front view of the inner mold plate positioning steel plate in the prefabricated circular pipe culvert mold provided by the present application;

[0031] In the drawings: 1, outer mold; 11, horizontal rib; 12, vertical rib; 2, inner mold; 21, wedge-shaped quick-release inner mold plate; 22, first inner mold plate; 23, second inner mold plate; 3, base; 4, movable base plate; 5, outer mold positioning steel plate; 51, connecting part; 52, positioning part; 6, inner mold plate positioning steel plate; 61, first lifting hook; 7, lead screw; 8, nut; 9, foot pad. DETAILED DESCRIPTION

[0032] 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.

[0033] The purpose of this invention is to provide a precast circular culvert mold and a precast circular culvert hoisting method to solve the problems existing in the prior art, facilitate the hoisting of the precast circular culvert from the mold base and ensure safe construction during the process, avoid secondary construction of the precast circular culvert and reduce the workload in the later stage.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] This embodiment provides a prefabricated circular pipe culvert mold, such as Figs. 1-6 As shown, the system includes: an inner mold 2, an outer mold 1, a base 3, and multiple movable base plates 4. The bottom of the inner mold 2 is detachably fixed to the base 3, and the bottom of the outer mold 1 is detachably fixed to the base 3. The annular cavity formed between the outer mold 1, the inner mold 2, and the base 3 is used for pouring concrete to form a precast circular culvert. The base 3 is provided with multiple opening slots, the inner ends of which extend to the position of the base 3 located inside the inner mold 2, and the outer ends of which extend outward to the outer edge of the base 3. The first end of the movable base plate 4 is rotatably connected to the base 3 at the inner end of the opening slot, and the second end of the movable base plate 4 is detachably fixed to the base 3 at the outer end of the opening slot to seal the opening slot. By providing opening slots on the base 3 and through... The first end of the movable base plate 4 is rotatably connected to the base 3 at the inner end of the opening slot, and the second end of the movable base plate 4 is detachably fixed to the base 3 at the outer end of the opening slot to seal the opening slot. After the precast circular culvert is completed using the precast circular culvert mold and the inner mold 2 and outer mold 1 are removed, the second end of the movable base plate 4 is disassembled from the base 3 and placed on the site, so that the hoisting machine's sling passes through the opening slot into the interior of the precast circular culvert, and then from the bottom to the top. The hoisting machine is then used to lift it to the storage area, avoiding secondary construction of the precast circular culvert such as pre-embedded parts and reserved holes, reducing the workload in the later stages, effectively improving the construction quality of the circular culvert, and ensuring construction safety.

[0037] In a preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a base 3 pin, the bottom of the second end of the movable bottom plate 4 is provided with a first pin hole, the base 3 on both sides of the movable bottom plate 4 is provided with a second pin hole, and the base 3 pin is used to fix the second end of the movable bottom plate 4 with the base 3 by penetrating the first pin hole and the two second pin holes. The top surface of the fixed movable bottom plate 4 is located in the same plane as the top surface of the base 3, which is simple in structure and convenient to disassemble.

[0038] In a preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a plurality of first fixing bolts and a plurality of second fixing bolts, the bottom of the outer mold is integrally connected with a first flange away from the direction of the annular cavity, the bottom of the inner mold is integrally connected with a second flange away from the direction of the annular cavity, the first flange is provided with a plurality of first connecting holes, the second flange is provided with a plurality of second connecting holes, the base 3 is provided with a plurality of third connecting holes and a plurality of fourth connecting holes, the third connecting holes are correspondingly arranged with the first connecting holes, and the fourth connecting holes are correspondingly arranged with the second connecting holes. One first fixing bolt is used to fix after penetrating one first connecting hole and one third connecting hole, and one second fixing bolt is used to fix after penetrating one second connecting hole and one fourth connecting hole. The structure is simple, the outer mold can be positioned through the third connecting holes, the inner mold can be positioned through the fourth connecting holes, and the designed thickness of the prefabricated circular pipe culvert is ensured.

[0039] In a preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a plurality of outer mold positioning members, the outer mold positioning members are fixedly connected with the bottom plate, and the outer mold positioning members are used to contact and position the side edge of the first flange away from the annular cavity. The outer mold positioning members can position the outer mold, ensure the position of the outer mold, and thus ensure the designed thickness of the prefabricated circular pipe culvert.

[0040] In a preferred scheme of the embodiment, the outer edge of the first flange has the same diameter as the outer edge of the base 3, the outer mold positioning member is an outer mold positioning steel plate 5, the outer mold positioning steel plate 5 comprises a connecting part 51 and a positioning part 52, the connecting part 51 is a part of the outer mold positioning steel plate 5 lower than the top surface of the base 3, the connecting part 51 is used to be fixedly connected with the base 3, and the positioning part 52 is a part of the outer mold positioning steel plate 5 higher than the top surface of the base 3. The bottom of the side edge close to the base 3 of the positioning part 52 is used to contact the outer edge of the first flange to align the outer edge of the first flange with the outer edge of the base 3, and the side edge close to the base 3 of the positioning part 52 gradually moves away from the outer mold from bottom to top. The structure is simple and convenient to install. When the outer mold is installed, the outer mold will slide downward to a certain position under the action of gravity after falling on the side edge close to the base 3 of the positioning part 52, thereby improving the installation efficiency.

[0041] In one preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a plurality of inner mold positioning steel plates 6, which are fixedly connected with the bottom plate and used to contact and position the side edge of the second flange away from the annular cavity, and the side of the inner mold positioning steel plate 6 away from the second flange is provided with a first lifting hook 61, which is simple in structure, convenient to operate, can position the position of the inner mold, and thus ensures the designed thickness of the prefabricated circular pipe culvert.

[0042] In one preferred scheme of the embodiment, the outer mold 1 comprises a plurality of outer mold plates, which are connected and spliced into a cylindrical structure through bolts, and each outer mold plate is correspondingly provided with at least one outer mold positioning piece, which facilitates the positioning of each outer mold plate; the inner mold 2 comprises a wedge-shaped quick-release inner mold plate 21, a first inner mold plate 22 and a second inner mold plate 23, the cross-sectional area of the wedge-shaped quick-release inner mold plate 21 gradually increases from bottom to top, the wedge-shaped quick-release inner mold plate 21, the first inner mold plate 22 and the second inner mold plate 23 are spliced into a cylindrical structure, and the wedge-shaped quick-release inner mold plate 21 is first hoisted upward for disassembly when the inner mold is disassembled, which solves the technical problem that the inner mold is difficult to pull out for disassembly, saves the inner mold disassembly time, improves the work efficiency, and the wedge-shaped quick-release inner mold plate 21, the first inner mold plate 22 and the second inner mold plate 23 are correspondingly provided with at least one inner mold positioning steel plate 6, which facilitates positioning, and the top of the inner side wall of the first inner mold plate 22 and the second inner mold plate 23 is provided with a second lifting hook, and the outer side wall of the outer mold plate is provided with a third lifting hook, and the top of the wedge-shaped quick-release inner mold plate 21 is provided with a fourth lifting hook, which facilitates hoisting by using hoisting machinery.

[0043] In one preferred scheme of the embodiment, the outer side wall of the outer mold plate is provided with a plurality of horizontal ribs 11 and a plurality of vertical ribs 12, and each horizontal rib 11 and vertical rib 12 is vertically arranged to enhance the strength of the outer mold plate and avoid deformation of the outer mold plate during disassembly, and the inner side wall of the inner mold is provided with a plurality of horizontal ribs 11 and a plurality of vertical ribs 12, and each horizontal rib 11 and vertical rib 12 is vertically arranged, the vertical rib 12 adopts a 10*150mm steel plate, and the horizontal rib 11 adopts a 10# channel steel, so as to enhance the strength of the inner mold and avoid deformation of the inner mold during disassembly.

[0044] In one preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a plurality of lead screws 7 and a plurality of nuts 8, the top end of the outer mold plate is provided with at least one first through hole, the top end of the wedge-shaped quick-release inner mold plate 21, the first inner mold plate 22 and the second inner mold plate 23 is provided with at least one second through hole, the second through hole is correspondingly provided with the first through hole, the two ends of one lead screw 7 protruding out of one first through hole and one second through hole are fixedly connected by the nut 8, which is simple in structure, convenient to use, can avoid displacement between the inner mold and the outer mold through the threaded connection of the nut 8 and the lead screw 7, and ensures the uniform thickness of the prefabricated circular pipe culvert wall.

[0045] In a preferred scheme of the embodiment, the base 3 is circular in structure, and the interior of the base 3 is optimized to be hollow to reduce material input; the number of the movable bottom plates 4 is three and they are uniformly distributed along the circumference of the base 3, facilitating hoisting of the prefabricated circular pipe culvert from three directions, ensuring balance during hoisting, and the bottom of the base 3 is provided with a foot pad 9 to increase the height of the base 3 and provide space for dismounting of the movable bottom plates 4.

[0046] In a preferred scheme of the embodiment, the prefabricated circular pipe culvert mold further comprises a release agent layer, which is applied to the outer sidewall of the inner mold, the inner sidewall of the outer mold, and the position between the inner mold and the outer mold on the top of the base and the movable bottom plate 4, to avoid adhesion of the poured concrete to the mold, facilitating mold dismounting.

[0047] Embodiment Two

[0048] The embodiment provides a prefabricated circular pipe culvert hoisting method, characterized by comprising the following steps.

[0049] S1: Hoist the base 3 to a designated position by a lifting belt through a first lifting hook 61.

[0050] S2: Hoist the first inner mold plate 22, the second inner mold plate 23, and the wedge-shaped quick-release inner mold plate 21 in the inner mold to the base 3 and fix the base 3 and the second flange of the inner mold through a second fixing bolt, and splice and fix the first inner mold plate 22, the second inner mold plate 23, and the wedge-shaped quick-release inner mold plate 21 through the second fixing bolt.

[0051] S3: Hoist the processed reinforcement cage between the third connecting hole and the fourth connecting hole of the base 3.

[0052] S4: Hoist the outer mold to the base 3 and fix the first flange and the base 3 through a first fixing bolt.

[0053] S5: Adjust the concrete protective layer, and after passing the inspection, pour concrete into the annular cavity.

[0054] S6: After the concrete strength reaches the requirement, dismount the mold, and the dismounting sequence is to dismount the outer mold first, then dismount the inner mold, and when dismounting the inner mold, dismount the wedge-shaped quick-release inner mold plate 21 first.

[0055] S7: Remove the pins of the base 3, dismount the movable bottom plates 4, pass the lifting belt through the open slot, set the lifting belt protection measures at the contact surface of the pipe culvert, and transport the circular pipe culvert to the storage area and enter the next section of pipe culvert prefabrication construction.

[0056] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A prefabricated circular pipe culvert mold, characterized in that: include: The inner mold includes a wedge-shaped quick-release inner template, a first inner template, and a second inner template. The cross-sectional area of ​​the wedge-shaped quick-release inner template gradually increases from bottom to top. The wedge-shaped quick-release inner template, the first inner template, and the second inner template are spliced ​​together to form a cylindrical structure. A fourth hook is provided at the top of the wedge-shaped quick-release inner template. Outer mold The base, the bottom of the inner mold is detachably fixed to the base, the bottom of the outer mold is detachably fixed to the base, and the annular cavity formed between the outer mold, the inner mold and the base is used to pour concrete to form a precast circular culvert. The base is provided with at least one opening groove, the inner end of the opening groove extends to the position of the base located inside the inner mold, and the outer end of the opening groove extends outward to the outer edge of the base. Multiple movable base plates, the first end of the movable base plate is rotatably connected to the base at the inner end of the opening groove, and the second end of the movable base plate is detachably fixed to the base at the outer end of the opening groove to seal the opening groove. The base has a circular ring structure, and the number of movable base plates is three and they are evenly distributed along the circumference of the base. The bottom of the base is provided with pads. as well as The outer mold has a first fixing bolt and a second fixing bolt. The bottom of the outer mold has a first flange away from the annular cavity, and the bottom of the inner mold has a second flange away from the annular cavity. The first flange has a plurality of first connecting holes, and the second flange has a plurality of second connecting holes. The base has a plurality of third connecting holes and a plurality of fourth connecting holes. The third connecting holes correspond to the first connecting holes, and the fourth connecting holes correspond to the second connecting holes. One first fixing bolt passes through one of the first connecting holes and one of the third connecting holes for fixing, and one second fixing bolt passes through one of the second connecting holes and one of the fourth connecting holes for fixing.

2. The precast circular culvert mold according to claim 1, characterized in that: It also includes multiple outer mold positioning components, which are fixedly connected to the base plate, and are used to contact and position the first flange on the side away from the annular cavity.

3. The precast circular culvert mold according to claim 2, characterized in that: The outer edge of the first flange has the same diameter as the outer edge of the base. The outer mold positioning component is an outer mold positioning steel plate, which includes a connecting part and a positioning part. One end of the connecting part is located below the bottom surface of the base and is fixedly connected to the base. The other end of the connecting part is fixedly connected to the lower end of the positioning part. The upper end of the positioning part protrudes upward from the top surface of the base. The bottom of the side edge of the positioning part near the base is used to contact the outer edge of the first flange to align the outer edge of the first flange with the outer edge of the base. The side edge of the upper end of the positioning part near the base gradually moves away from the outer mold plate from bottom to top.

4. The precast circular pipe culvert mold according to claim 3, characterized in that: It also includes multiple inner mold positioning steel plates, which are fixedly connected to the base plate. The inner mold positioning steel plates are used to contact and position the side of the second flange away from the annular cavity. A first hook is provided on the side of the inner mold positioning steel plate away from the second flange.

5. The precast circular culvert mold according to claim 4, characterized in that: The outer mold includes multiple outer templates, each of which is spliced ​​into a cylindrical structure, and each outer template is correspondingly set with at least one outer mold positioning component; the wedge-shaped quick-release inner template, the first inner template, and the second inner template are each correspondingly set with at least one inner mold positioning steel plate, the top of the inner sidewall of the first inner template and the second inner template are each provided with a second hook, and the outer sidewall of the outer template is provided with a third hook.

6. The precast circular culvert mold according to claim 5, characterized in that: It also includes multiple lead screws and multiple nuts. The top end of the outer template is provided with at least one first through hole. The top ends of the wedge-shaped quick-release inner template, the first inner template and the second inner template are all provided with at least one second through hole. The second through hole is provided in correspondence with the first through hole. The two ends of the lead screw that extend through one first through hole and one second through hole are threadedly connected and fixed by the nuts.

7. The precast circular pipe culvert mold according to claim 1, characterized in that: It also includes a release agent layer, which is applied to the outer side wall of the inner mold, the inner side wall of the outer mold, and the top of the base and the movable base plate at the position between the inner mold and the outer mold.

8. A method for hoisting a precast circular culvert, characterized in that: Includes the following steps: S1: Prefabricated circular culverts are manufactured using the prefabricated circular culvert mold as described in any one of claims 1 to 7; S2: After removing the inner mold and the outer mold, detach the second end of the movable base plate from the base and lower it; S3: Secure the precast circular culvert by inserting a sling through the opening slot, and then hoist the precast circular culvert to the storage area.

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