Hole reserving device for constructional engineering

Abstract

The invention relates to the technical field of constructional engineering, in particular to a constructional engineering hole reserving device which comprises a placing frame, supporting plates are connected to the placing frame, filler strips are arranged between the adjacent supporting plates, the constructional engineering hole reserving device further comprises an opening mechanism, the opening mechanism comprises a fixing frame connected with the placing frame, and the fixing frame is connected with a fixing sleeve. The fixing sleeve is connected with an inner thread sleeve, the inner thread sleeve is connected with a second lead screw, the second lead screw is connected with an inclined rod, the inclined rod is connected with a sliding block, the sliding block is connected with a push rod, and a supporting tile is arranged at the end of the push rod. The tightening mechanism comprises a first frame body arranged on the supporting plate, a steel wire rope is arranged on the first frame body, a penetrating hole is formed in the supporting plate, the steel wire rope penetrates through the penetrating hole and then is connected with a second frame body, and the steel wire rope crosses the second frame body and then is connected with a fixing sleeve; the invention has the advantages that the mutual connection firmness can be realized, the structure is simple, and the disassembly is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, in particular to a building engineering hole leaver. BACKGROUND

[0002] In building engineering, a hole leaver is used as a device for leaving holes in concrete or wall surface construction. In order to install subsequent sewer pipes, water supply pipes and the like, a hole needs to be left in the cast-in-place concrete slab. Since the existing hole leaver for building engineering is inconvenient to disassemble after construction, the operator needs to spend a lot of time disassembling it, and violent disassembly is easy to damage the construction position. Therefore, the entire sleeve is divided into several parts, the middle spacer is first removed during disassembly, and then the other plates are sequentially removed. The design of this structure easily leads to poor fixing ability of the hole leaver. Since it is divided into several parts, the firmness between them is weak.

[0003] A patent with the patent publication number CN220117749U and the patent name "A hole leaver for building engineering" is retrieved, and specifically discloses a hole leaver for building engineering, which comprises a supporting side plate, a hole leaver convenient assembly mechanism is arranged on one side of the supporting side plate; the hole leaver convenient assembly mechanism comprises an adjusting lead screw, a threaded sleeve plate, a first sliding side plate, a second sliding side plate, a first supporting plate, a second supporting plate and a convenient hole leaving assembly, a sliding groove is formed in one side of the supporting side plate, one end of the adjusting lead screw is rotationally connected to the inner bottom of the sliding groove, the other end of the adjusting lead screw is slidably penetrated through the top of the supporting side plate, the threaded sleeve plate is symmetrically screwed to the outer wall of the adjusting lead screw, the first sliding side plate and the second sliding side plate are respectively fixedly connected to the outer wall of the corresponding threaded sleeve plate, and the inner walls of the first sliding side plate and the second sliding side plate are slidably connected to one side of the supporting side plate, the first supporting plate is fixedly connected to one side of the first sliding side plate, the second supporting plate is fixedly connected to one side of the second sliding side plate, and the convenient hole leaving assembly is arranged on the outer walls of the first supporting plate and the second supporting plate.

[0004] Through the analysis of the above-mentioned disclosed materials, although the disassembly problem can be solved, the fixing ability between the supporting sleeve plates is greatly weakened compared with the overall sleeve. SUMMARY

[0005] Therefore, the present application provides a building engineering hole leaver which not only has firm connection between each other, but also has a simple structure and is convenient to disassemble.

[0006] In order to solve the above technical problems, the present application provides a building engineering hole leaver, which comprises a placing rack, the placing rack is connected with supporting plates, a spacer is arranged between adjacent supporting plates, and the building engineering hole leaver further comprises The expansion mechanism comprises a fixed frame connected with the placing frame, a fixed sleeve connected with the fixed frame, an inner sleeve connected with the fixed sleeve, a second screw rod connected with the inner sleeve, an inclined rod connected with the second screw rod, a sliding block connected with the inclined rod, and a push rod connected with the sliding block, and an end of the push rod is provided with a supporting tile. The tightening mechanism comprises a first frame arranged on the supporting plate, a steel wire rope arranged on the first frame, a through hole arranged on the supporting plate, a second frame connected with the steel wire rope after the steel wire rope penetrates through the through hole, a fixed sleeve connected with the steel wire rope after the steel wire rope passes through the second frame, and a rope roller connected with the steel wire rope after the steel wire rope penetrates through the fixed sleeve, and the rope roller is arranged on the outer side of the inner sleeve. The loosening mechanism comprises a first screw rod arranged on the support, and the first screw rod is connected with the pad strip.

[0007] Further, the fixed frame is in a ring structure, and the outer side is fixedly connected between the plate and the placing frame, the fixed frame and the fixed sleeve are connected through bolts, the bottom of the fixed sleeve is connected with a sliding seat, and the sliding seat is provided with a sliding groove, and the sliding groove is placed with a sliding block.

[0008] Further, the top of the fixed sleeve is provided with a raised ring, the raised ring is connected with a knob and arranged in the inside of the knob, the knob and the fixed sleeve are connected through sliding, and the lower end of the knob is connected with the inner sleeve.

[0009] Further, the upper part of the second screw rod is provided with a thread and connected with the inner sleeve through the thread, the second screw rod can be driven to rise and fall through the rotation of the inner sleeve, the bottom of the second screw rod is provided with a connecting head, the outer side of the connecting head is provided with a connecting frame, and the connecting frame is connected with the inclined rod.

[0010] Further, the connecting frame and the inclined rod are connected through a pin shaft, the other end of the inclined rod and the sliding block are connected through a pin shaft, the outer side of the sliding block is provided with the push rod, the end of the push rod is fixedly connected with the supporting tile, the supporting tile is in an arc structure, and the center of the supporting tile coincides with the center of the supporting plate.

[0011] Further, the bottom of the supporting plate is provided with a plate, the plate is provided with a through hole, the through hole is penetrated with the steel wire rope, one end of the steel wire rope is provided with a cap, the diameter of the cap is larger than the diameter of the through hole, the other end of the steel wire rope is penetrated into the through hole, and the cap and the through hole are arranged on the lower end face of one supporting plate.

[0012] Further, the first frame body is provided with a first roller, the steel wire rope is threaded into the through hole after passing through the first roller, the inner side of the placing frame is provided with a fixing ring, the fixing ring is provided with a second frame body, the second frame body is connected with a second roller, and the steel wire rope is threaded into the fixing sleeve after passing through the second roller.

[0013] Further, the middle part of the rope roller is a groove structure, and the rope roller is fixedly connected between the inner side surface and the end of the steel wire rope.

[0014] Further, the gasket is provided with a threaded hole, a first lead screw is connected through the threaded hole, the top of the first lead screw is provided with a screw cap, the screw cap is arranged at the upper end of the support, and the first lead screw and the support are rotationally connected.

[0015] Further, the fixing ring and the placing frame are fixedly connected, the fixing ring is provided with a hole corresponding to the support plate, the fixing ring is provided with a hole corresponding to the gasket, and the gasket can be pulled out along the hole under the action of the first lead screw.

[0016] The beneficial effects of the above technical solutions of the present application are as follows: 1. By arranging the opening mechanism and the tightening mechanism, the support plate and the gasket are connected in an inner-outer combined manner, and a certain fastening property is achieved.

[0017] 2. The structure is simple and convenient to disassemble, the first lead screw and the gasket are connected through threads, the gasket can be conveniently pulled out, and the hole leaving device can be conveniently disassembled. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure of the present application is shown in the figure; Figure 2 The structure of the present application is shown in the figure; Figure 1 The enlarged view of the A part in the figure; Figure 3 The structure of the present application is shown in the figure; Figure 1 The structure of the present application is shown in the figure; Figure 4 The structure of the present application is shown in the figure; Figure 3 The enlarged view of the B part in the figure; Figure 5 The structure of the present application is shown in the figure; Figure 1 The structure of the present application is shown in the figure; Figure 6 The structure of the present application is shown in the figure; Figure 5 The enlarged view of the C part in the figure; Figure 7 The structure of the present application is shown in the figure; Figure 5 The structure of the present application is shown in the figure; Figure 8Structure diagram of the expansion mechanism; Figure 9 For Figure 8 Enlarged view of the D part; Figure 10 For Figure 8 Structure diagram after removing the fixed sleeve; Figure 11 For Figure 8 Structure diagram from another perspective; Figure 12 For Figure 11 Enlarged view of the E part; Figure 13 Structure diagram of the connection between the second lead screw, rope roller and internal screw sleeve.

[0019] In the figure: 1, placement rack; 2, support; 3, fixed frame; 4, knob; 5, fixed ring; 6, support plate; 7, pad strip; 8, spiral cap; 9, first lead screw; 10, sliding seat; 11, support tile; 12, first frame body; 13, first roller; 14, steel wire rope; 15, second frame body; 16, second roller; 17, perforation; 18, raised ring; 19, second lead screw; 20, fixed sleeve; 21, let go hole; 22, rope roller; 23, sliding block; 24, push rod; 25, inclined rod; 26, slide; 27, connecting frame; 28, connecting head; 29, internal screw sleeve. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings of the embodiments of the present application to further describe the embodiments of the present application in detail. Figures 1 to 13 The technical solutions of the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0021] As Figures 1 to 13 shown: Embodiment 1

[0022] The utility model provides a kind of construction engineering hole leaver, including placing rack 1, the supporting plate 6 is connected with the placing rack 1, and the gasket 7 is arranged between adjacent supporting plate 6, further including opening mechanism, the fixed frame 3 is connected with the placing rack 1, the fixed sleeve 20 is connected with the fixed frame 3, the inner sleeve 29 is connected with the fixed sleeve 20, the second lead screw 19 is connected with the inner sleeve 29, the inclined rod 25 is connected with the second lead screw 19, the sliding block 23 is connected with the inclined rod 25, the push rod 24 is connected with the sliding block 23, and the supporting tile 11 is arranged on the end of push rod 24;Tightening mechanism, the first frame body 12 is arranged on the supporting plate 6, the steel wire rope 14 is arranged on the first frame body 12, the perforation 17 is arranged on the supporting plate 6, the steel wire rope 14 is connected with the second frame body 15 after being passed through the perforation 17, the steel wire rope 14 is connected with the fixed sleeve 20 after passing over the second frame body 15, the rope roller 22 is connected with the steel wire rope 14 after being passed through the fixed sleeve 20, and the rope roller 22 is arranged on the outer side of the inner sleeve 29;Loosen mechanism, the first lead screw 9 is arranged on the support 2, and the gasket 7 is connected with the first lead screw 9.

[0023] In the embodiment, the problem of firmness and convenient disassembly of the hole leaver during use is solved, and the opening mechanism and the tightening mechanism are arranged in the technology, and the two tighten the supporting plate 6 through the linkage structure, so that the hole leaver can exist as a whole cylindrical structure.

[0024] Specifically, in the opening mechanism, the inner sleeve 29 is used, the second lead screw 19 is connected with the inner sleeve 29, the inner sleeve 29 can rotate under the action of the knob 4, the fixed sleeve 20 supports the rotation of the inner sleeve 29, the first lead screw 9 is lifted and lowered when the inner sleeve 29 rotates because of the threaded connection between the first lead screw 9 and the inner sleeve 29, the inclined rod 25 is arranged at the bottom of the first lead screw 9, the sliding block 23 is connected with the inclined rod 25, the push rod 24 is connected with the sliding block 23, and the supporting tile 11 is arranged on the push rod 24, the supporting tile 11 moves outward from the inside to support the supporting plate 6 when the inclined position of the inclined rod 25 changes.

[0025] In the tightening mechanism, the first frame body 12 is arranged at the bottom of the supporting tile 11, the second frame body 15 is arranged on the fixed ring 5 of the placing rack 1, the first pulley 13 is arranged on the first frame body 12, the second pulley 16 is arranged on the second frame body 15, and the steel wire rope 14 is connected with each supporting plate 6 in turn, and the other end of the steel wire rope 14 is connected with the inner sleeve 29, so that the steel wire rope 14 is wound and tightened when the inner sleeve 29 rotates.

[0026] Through the effect of cooperation between the inside and the outside, the supporting plate 6 and the gasket 7 can be tightly fixed.

[0027] By setting the loosening mechanism, the mat strip 7 can be pulled out, thereby achieving the purpose of conveniently removing the hole leaving device. Embodiment 2

[0028] The fixing frame 3 is in a ring structure, and is fixedly connected between the outer side and the inner side of the placing frame 1. The fixing frame 3 is connected with the fixing sleeve 20 through bolts. The bottom of the fixing sleeve 20 is connected with the sliding seat 10. The sliding seat 10 is provided with the sliding groove 26. The sliding groove 26 is provided with the sliding block 23.

[0029] Different from the above embodiment, in the embodiment, the fixing frame 3 is in a ring structure, and is fixedly connected between the outer side and the inner side of the placing frame 1. The fixing frame 3 is connected with the fixing sleeve 20 through bolts. The bottom of the fixing sleeve 20 is connected with the sliding seat 10. The sliding seat 10 is in a circular plate structure, and the axis of the sliding seat 10 and the fixing sleeve 20 is perpendicular. Four sliding grooves 26 are arranged on the sliding seat 10. The sliding groove 26 is in a groove structure, and the sliding block 23 is arranged in the sliding groove 26. The sliding block 23 slides in the sliding groove 26. The lower part of the fixing sleeve 20 is provided with the accommodation hole 21, so as to facilitate the movement of the inclined rod 25. Embodiment 3

[0030] The top of the fixing sleeve 20 is provided with the raised ring 18. The raised ring 18 is connected with the knob 4, and is arranged in the inside of the knob 4. The knob 4 is slidably connected with the fixing sleeve 20. The lower end of the knob 4 is connected with the internal thread sleeve 29.

[0031] Different from the above embodiment, in the embodiment, the top of the fixing sleeve 20 is provided with the raised ring 18. The raised ring 18 is outwardly raised, and is connected with the knob 4. The knob 4 is sleeved on the raised ring 18. The knob 4 rotates on the horizontal plane. The internal thread sleeve 29 is arranged on the lower end surface of the knob 4. The rotation of the knob 4 can drive the rotation of the internal thread sleeve 29. The internal thread sleeve 29 is arranged in the fixing sleeve 20, and has a spacing with the fixing sleeve 20. Embodiment 4

[0032] The upper part of the second lead screw 19 is provided with threads, and is connected with the internal thread sleeve 29 through the threads. The rotation of the internal thread sleeve 29 can drive the lifting of the second lead screw 19. The bottom of the second lead screw 19 is provided with the connecting head 28. The outer side of the connecting head 28 is provided with the connecting frame 27. The connecting frame 27 is connected with the inclined rod 25.

[0033] Different from the above embodiment, in this embodiment, a section of thread is arranged on the upper part of the second screw rod 19, which facilitates the connection between the inner sleeve 29 and the second screw rod 19. The up and down movement of the second screw rod 19 can be realized by rotating the knob 4. The connector 28 is fixedly arranged at the lower end of the second screw rod 19. The outer side of the connector 28 is provided with four connecting frames 27. The connecting frames 27 and the inclined rod 25 are connected through a pin shaft. Embodiment 5

[0034] The connecting frames 27 and the inclined rod 25 are connected through a pin shaft. The other end of the inclined rod 25 and the sliding block 23 are connected through a pin shaft. The outer side of the sliding block 23 is provided with the push rod 24. The end of the push rod 24 is fixedly connected with the support tile 11. The support tile 11 is in an arc structure. The center of the support tile 11 coincides with the center of the support plate 6.

[0035] Different from the above embodiment, in this embodiment, the connecting frames 27 and the inclined rod 25 are connected through a pin shaft. The other end of the inclined rod 25 and the sliding block 23 are also connected through a pin shaft. The end of the sliding block 23 is the push rod 24. The push rod 24 is fixedly connected with the support tile 11. In order to realize the good contact between the support tile 11 and the inner side of the support plate 6, the center of the support tile 11 coincides with the center of the support plate 6. Embodiment 6

[0036] The bottom of the support plate 6 is provided with a plate. The plate is provided with a through hole. The steel wire rope 14 is inserted into the through hole. The one end of the steel wire rope 14 is provided with a cap. The diameter of the cap is larger than the diameter of the through hole. The other end of the steel wire rope 14 is inserted into the through hole 17. The cap and the through hole 17 are arranged on the lower end surface of one support plate 6.

[0037] Different from the above embodiment, in this embodiment, the bottom of the support plate 6 is provided with a plate. The plate is provided with a through hole. The steel wire rope 14 is inserted into the through hole. The one end of the steel wire rope 14 is provided with a cap. The diameter of the cap is larger than the diameter of the through hole. The other end of the steel wire rope 14 is inserted into the through hole 17. The cap and the through hole 17 are arranged on the lower end surface of one support plate 6. Embodiment 7

[0038] The first frame body 12 is provided with the first roller 13. The steel wire rope 14 is inserted into the through hole 17 after passing through the first roller 13. The inner side of the placing rack 1 is provided with the fixed ring 5. The fixed ring 5 is provided with the second frame body 15. The second frame body 15 is connected with the second roller 16. The steel wire rope 14 is inserted into the fixed sleeve 20 after passing through the through hole and the second roller 16.

[0039] Different from the above embodiment, in this embodiment, the first roller 13 and the second roller 16 are used for the turning of the steel wire rope 14, so as to avoid the damage of the support plate 6 caused by friction. Embodiment 8

[0040] The middle position of the rope roller 22 is a groove structure, and the inner side of the rope roller 22 is fixedly connected with the end of the steel wire rope 14, and the rope roller 22 is wound on the steel wire rope 14 while rotating.

[0041] Different from the above embodiment, in this embodiment, the rope roller 22 is fixedly connected with the outer side of the inner sleeve 29, and the rope roller 22 facilitates the winding of the steel wire rope 14. Embodiment 9

[0042] The pad strip 7 is provided with a threaded hole, and the first lead screw 9 is connected through the threaded hole, the top of the first lead screw 9 is provided with a screw cap 8, the screw cap 8 is arranged at the upper end of the support 2, and the first lead screw 9 and the support 2 are rotationally connected.

[0043] Different from the above embodiment, in this embodiment, in order to facilitate the lifting of the pad strip 7, a threaded hole is arranged on the pad strip 7, and the first lead screw 9 is connected, and by screwing the screw cap 8 on the first lead screw 9, the lifting of the pad strip 7 can be operated. Embodiment 10

[0044] The fixed ring 5 is fixedly connected with the placing rack 1, the fixed ring 5 is provided with a hole corresponding to the supporting plate 6, the fixed ring 5 is provided with a hole corresponding to the pad strip 7, and the pad strip 7 can be pulled out along the hole under the action of the first lead screw 9.

[0045] Different from the above embodiment, in this embodiment, the hole corresponding to the pad strip 7 is arranged on the fixed ring 5, and the support 2 and the first lead screw 9 are matched to facilitate pulling out of the pad strip 7.

[0046] The working method (or working principle) of the application is as follows: In the working process of the present application, first, the supporting plate 6 is inserted into the corresponding hole in the fixed ring 5, the pad strip 7 is inserted into the corresponding hole in the fixed ring 5, the steel wire rope 14 is sequentially inserted through the hole in the plate arranged at the bottom of the supporting plate 6, then one end of the steel wire rope 14 is inserted into the perforation 17 and enters the rope roller 22 arranged inside the fixed sleeve 20, and it should be noted that the fixed sleeve 20 is also provided with a hole for the insertion of the steel wire rope 14, and the end of the steel wire rope 14 is fixedly connected with the inner side of the rope roller 22.

[0047] After the above operation is completed, the hole leaver is placed at the reserved position, and then the knob 4 is rotated to drive the inner sleeve 29 to rotate. The rotation of the inner sleeve 29 can realize the rotation of the rope roller 22 and the descent of the second lead screw 19. At the same time, the second lead screw 19 descends, and since the connecting head 28 is arranged at the end of the second lead screw 19, the connecting frame 27 is arranged on the outer side of the connecting head 28, the inclined rod 25 is arranged on the connecting frame 27, the inclined rod 25 drives the sliding block 23 to move outward, the sliding block 23 pushes the push rod 24 to move outward, thereby realizing the outward movement of the supporting tile 11 and contacting the inner side of the supporting plate 6. At the same time of the above movement, the rope roller 22 rotates to realize the tightening of the steel wire rope 14, the steel wire rope 14 drives the lower end of the supporting plate 6 to realize the tightening, and the tightening between the supporting plate 6 and the mat strip 7 is realized by the combination of the inner and outer.

[0048] When disassembling, the knob 4 is rotated in reverse to release the tightening device, and then the screw cap 8 is rotated to realize the rotation of the first lead screw 9, thereby realizing the pulling-out effect of the mat strip 7. After the mat strip 7 is pulled out, there is no extrusion force between the supporting plates 6, and the hole leaver can be easily disassembled.

[0049] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hole-sealing device for construction projects, comprising a placement frame (1), wherein the placement frame (1) is connected to a support plate (6), and a pad (7) is provided between adjacent support plates (6), characterized in that: Also includes The opening mechanism includes a fixed frame (3) connected to the placement frame (1), the fixed frame (3) is connected to a fixed sleeve (20), the fixed sleeve (20) is connected to an inner threaded sleeve (29), the inner threaded sleeve (29) is connected to a second lead screw (19), the second lead screw (19) is connected to a diagonal rod (25), the diagonal rod (25) is connected to a slider (23), the slider (23) is connected to a push rod (24), and the end of the push rod (24) is provided with a support tile (11); The tightening mechanism includes a first frame (12) mounted on a support plate (6), a wire rope (14) mounted on the first frame (12), a through hole (17) mounted on the support plate (6), the wire rope (14) passing through the through hole (17) and being connected to a second frame (15), the wire rope (14) passing over the second frame (15) and being connected to a fixed sleeve (20), the wire rope (14) passing through the fixed sleeve (20) and being connected to a rope roller (22), the rope roller (22) being mounted on the outer side of the inner threaded sleeve (29); The release mechanism includes a first lead screw (9) mounted on a bracket (2) and the first lead screw (9) is connected to a pad (7).

2. The hole-retaining device for construction projects according to claim 1, characterized in that: The fixing frame (3) is a ring structure, and the outer side is fixedly connected to the placement frame (1) through a plate. The fixing frame (3) and the fixing sleeve (20) are connected by bolts. The bottom of the fixing sleeve (20) is connected to a sliding seat (10). A slide rail (26) is provided on the sliding seat (10), and a slider (23) is placed in the slide rail (26).

3. The hole-retaining device for construction projects according to claim 2, characterized in that: The top of the fixed sleeve (20) is provided with a raised ring (18), the raised ring (18) is connected to a knob (4) and is located inside the knob (4), the knob (4) and the fixed sleeve (20) are slidably connected, and the lower end of the knob (4) is connected to an inner threaded sleeve (29).

4. A hole-retaining device for construction projects according to claim 3, characterized in that: The upper part of the second lead screw (19) is provided with a thread and is connected to the inner thread sleeve (29) by the thread. The rotation of the inner thread sleeve (29) can drive the second lead screw (19) to rise and fall. The bottom of the second lead screw (19) is provided with a connector (28). The outer side of the connector (28) is provided with a connecting frame (27). The connecting frame (27) is connected to the inclined rod (25).

5. A hole-retaining device for construction projects according to claim 4, characterized in that: The connecting frame (27) and the inclined rod (25) are connected by a pin. The other end of the inclined rod (25) is connected to the slider (23) by a pin. A push rod (24) is provided on the outside of the slider (23). The end of the push rod (24) is fixedly connected to the support tile (11). The support tile (11) has an arc-shaped structure. The center of the support tile (11) coincides with the center of the support plate (6).

6. A hole-retaining device for construction projects according to claim 5, characterized in that: The bottom of each support plate (6) is provided with a plate, which has a through hole. A steel wire rope (14) is threaded through the through hole. One end of the steel wire rope (14) is provided with a cap, the diameter of which is larger than the diameter of the through hole. The other end of the steel wire rope (14) is threaded into a through hole (17). The cap and the through hole (17) are both located on the lower end face of a support plate (6).

7. A hole-retaining device for construction projects according to claim 6, characterized in that: The first frame (12) is provided with a first roller (13), and the wire rope (14) passes around the first roller (13) and enters the through hole (17). The inner side of the placement frame (1) is provided with a fixing ring (5), and the fixing ring (5) is provided with a second frame (15). The second frame (15) is connected to a second roller (16). The wire rope (14) passes through the through hole, passes around the second roller (16), and enters the fixing sleeve (20).

8. A hole-retaining device for construction projects according to claim 7, characterized in that: The middle part of the rope roller (22) has a groove structure, and the inner side of the rope roller (22) is fixedly connected to the end of the wire rope (14). The rope roller (22) winds the wire rope (14) while rotating.

9. A hole-retaining device for construction projects according to claim 8, characterized in that: The pad (7) is provided with a threaded hole and a first lead screw (9) is connected through the threaded hole. A spiral cap (8) is provided on the top of the first lead screw (9). The spiral cap (8) is located at the upper end of the bracket (2). The first lead screw (9) and the bracket (2) are rotatably connected.

10. A hole-retaining device for construction projects according to claim 9, characterized in that: The fixing ring (5) and the placement frame (1) are fixedly connected. The fixing ring (5) has a hole corresponding to the support plate (6) and a hole corresponding to the pad (7). The pad (7) can be pulled out along the hole by the first lead screw (9).

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