Slip form device of vertical shaft

By using the support platform and platform lifting mechanism of the vertical shaft slipform device, the difficulties and site occupation problems of funnel-shaped vertical shaft lining construction were solved, and efficient vertical shaft inner wall lining construction was achieved.

CN223661826UActive Publication Date: 2025-12-12POWERCHINA HUADONG ENG CORP LTD
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Patent Information

Application Number
CN202520411325.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Priority Date
2024-08-30
Filing Date
2025-03-11
Publication Date
2025-12-12
Estimated Expiration
2035-03-11

AI Technical Summary

Technical Problem

Existing technologies present challenges in lining special-shaped shafts, such as funnel-shaped shafts, due to the high difficulty of construction and the need for construction site occupation. In particular, the appearance quality control of the inner wall lining of the shaft is difficult, and the traction mechanism requires construction site occupation.

Method used

A vertical shaft slipform device is adopted, including a support platform, a platform telescopic mechanism, and a platform lifting mechanism. The platform telescopic mechanism adapts to the changing diameter of the inner wall of the vertical shaft, the platform lifting mechanism provides vertical support, and the lining construction of the inner wall of the vertical shaft is realized in combination with the material placement mechanism.

Benefits of technology

It improves the adaptability of the shaft inner wall lining, reduces the use of traction mechanisms, lowers project costs, and improves construction efficiency.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to a slip form device of a vertical shaft. The method is suitable for the technical field of shaft construction. According to the technical scheme, the device comprises a supporting platform, wherein a material distributing mechanism is arranged at the top of the supporting platform; the platform telescopic mechanisms are arranged on the supporting platform, the platform telescopic mechanisms are arranged in the radial direction of the supporting platform, the platform telescopic mechanisms are evenly distributed in the circumferential direction around the central axis of the supporting platform, and the platform telescopic mechanisms can abut against the inner wall of the vertical shaft through telescopic movement to form an auxiliary platform; the auxiliary platform is matched with the supporting platform to form a working platform for shaft operation; the platform lifting mechanisms are arranged at the outer edge ends of the platform telescopic mechanisms, the platform lifting mechanisms and the platform telescopic mechanisms are in one-to-one correspondence, the platform lifting mechanisms are at least partially buried in the inner wall of the vertical shaft, and the platform lifting mechanisms can be supported by the inner wall of the vertical shaft to lift the height of the working platform.
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Description

TECHNICAL FIELD

[0001] The utility model relates to vertical shaft construction technical field especially a vertical shaft's slip form device. BACKGROUND

[0002] At present, when lining operation is carried out to the vertical shaft, the sectional construction mode is adopted, the working platform is put into the vertical shaft first, the lining operation is carried out to the inner wall of the vertical shaft around the working platform, then the working platform is moved upwards, and the lining operation is carried out to the corresponding position of the inner wall of the vertical shaft after moving.

[0003] However, for the construction of part of the vertical shafts of special shape, for example, the vertical shafts of funnel shape, the following problems exist:

[0004] (1) Since the cross-sectional dimension of the funnel-shaped vertical shaft is always changing, the lining operation difficulty of the inner wall of the vertical shaft is greatly improved, and the appearance quality control difficulty of the lining of the inner wall of the vertical shaft is large;

[0005] (2) Most vertical shaft constructions need to arrange a traction mechanism outside the vertical shaft, and the traction mechanism is used to pull the working platform to move in the vertical shaft, and this kind of mode greatly occupies the construction site, and has a certain influence on the site construction. INVENTION CONTENTS

[0006] The technical problem to be solved by the utility model is: in view of the above problems, a vertical shaft slip form device is provided.

[0007] The technical scheme adopted by the utility model is: a vertical shaft slip form device, characterized by comprising:

[0008] A supporting platform is provided with a distribution mechanism on the top;

[0009] A platform telescopic mechanism is arranged on the supporting platform, the platform telescopic mechanism is arranged along the radial direction of the supporting platform, the platform telescopic mechanism is uniformly distributed in the circumferential direction around the central axis of the supporting platform, the platform telescopic mechanism can abut against the inner wall of the vertical shaft through telescopic movement and form an auxiliary platform, and the auxiliary platform cooperates with the supporting platform to form a working platform for the vertical shaft operation;

[0010] A platform lifting mechanism is arranged at the outer edge end of the platform telescopic mechanism, the platform lifting mechanism corresponds to the platform telescopic mechanism one by one, the platform lifting mechanism is at least partially embedded in the inner wall of the vertical shaft, and the platform lifting mechanism can lift the height of the working platform under the support of the inner wall of the vertical shaft.

[0011] By the above technical means, the platform telescopic mechanism is used to extend the supporting platform and abut against the inner wall of the shaft, the platform lifting mechanism is at least partially embedded in the inner wall of the shaft, so that the inner wall of the shaft can provide vertical support to the whole supporting platform, the telescopic platform telescopic mechanism is used to adapt to the variable diameter of the shaft, the working platform formed can cooperate with the inner wall of the shaft to facilitate the work of the construction personnel, and the distribution mechanism can be used for pouring the inner wall of the shaft, thereby improving the adaptability to the lining of the variable-diameter shaft inner wall.

[0012] In some embodiments, the platform telescopic mechanism comprises a telescopic truss, a first driving member and a telescopic connection assembly, a first sliding groove is arranged in the supporting platform in a radial direction, the telescopic truss is slidably connected in the first sliding groove, the first driving member connected with the telescopic truss is installed in the supporting platform, the first driving member is used to drive the telescopic truss to extend and retract along the first sliding groove, the ends of adjacent telescopic trusses are connected through the telescopic connection assembly, and the telescopic connection assembly can adapt to the size change of the inner wall of the shaft through telescopic extension.

[0013] In some embodiments, the telescopic connection assembly comprises a cross rib plate and an outer extension plate, the cross rib plate is installed at the end of the telescopic truss, the outer extension plate is arranged between adjacent cross rib plates, a second sliding groove is formed on the side of the outer extension plate facing the inner wall of the shaft, and adjacent two cross rib plates are slidably connected in the second sliding groove. The cross rib plate and the outer extension plate are fixed through a fixing member.

[0014] In some embodiments, the fixing member is a bolt, the bolt is inserted into the second sliding groove to fixedly connect the outer extension plate and the cross rib plate.

[0015] In some embodiments, the first driving member is a telescopic jack.

[0016] In some embodiments, the platform lifting mechanism comprises a support rod and a second driving member, the second driving member is installed at the end of the telescopic truss in a one-to-one correspondence, the support rod is connected with the second driving member in a one-to-one correspondence, the support rod is arranged along the length direction of the shaft, and the bottom of the support rod is at least partially embedded in the concrete layer of the inner wall of the shaft. The second driving member is used to lift the height of the working platform along the support rod.

[0017] In some embodiments, the second driving member is a through-type jack, and the support rod is connected through the inside of the through-type jack.

[0018] In some embodiments, the material distribution mechanism comprises a receiving hopper, a chute and a fixing frame, the chute is mounted on the inner wall of the shaft near the entrance end through the fixing frame, the entrance end of the chute is provided with the receiving hopper, and the exit end of the chute is directed to the inner wall of the shaft.

[0019] In some embodiments, the material distribution mechanism further comprises a first chute, a distributor, a mounting bracket and a plurality of second chutes, the distributor is mounted on the top of the support platform through the mounting bracket, the first end of the first chute is arranged below the exit end of the chute, the second end of the first chute is arranged at the entrance end of the distributor, the first ends of the plurality of second chutes are arranged at the exit end of the distributor, and the second ends of the plurality of second chutes are arranged at the inner walls around the shaft.

[0020] In some embodiments, the auxiliary platform is provided with a first construction platform, the upper portion of the auxiliary platform is provided with a second construction platform, the lower portion of the auxiliary platform is provided with a third construction platform, and the first construction platform, the second construction platform and the third construction platform are connected through a ladder.

[0021] The first construction platform is used for lining work of the concrete slurry by the construction personnel, the second construction platform is used for lengthening work of the reinforcing steel bars by the construction personnel, and the third construction platform is used for lining and troweling work by the construction personnel.

[0022] The utility model discloses beneficial effects are:

[0023] 1、Platform lifting mechanism is at least partially buried in the inner wall of the shaft, the inner wall of the shaft provides vertical support for the overall structure, the platform telescopic mechanism is used in the support platform and is telescopic along the radial direction, to adapt to the variable diameter condition of the funnel-shaped shaft, so that the working platform can cooperate with the inner wall of the shaft when being in each position of the shaft, and the platform telescopic mechanism abuts against the inner wall of the shaft can cooperate with the platform lifting mechanism to provide fixed support for the overall structure, the material distribution mechanism can be used for lining construction of the inner wall of the shaft, and then the platform lifting mechanism is used to lift the height of the overall structure, and the cycle is repeated until the lining construction of the inner wall of the shaft is completed.

[0024] 2、The platform lifting mechanism is partially buried in the inner wall of the shaft, the inner wall of the shaft provides vertical support for the overall structure, the use of the traction mechanism is reduced, and the platform telescopic mechanism is used to abut against the inner wall of the shaft and provide fixed support, through the cooperation of the platform telescopic mechanism and the platform lifting mechanism, the overall structure has sufficient support strength, not only the use of the traction mechanism is reduced, but also the engineering cost is reduced, and the efficiency of the on-site construction is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a sectional structure schematic view of the application at the upper position of the shaft.

[0026] Fig. 2 is a schematic cross-sectional view of the present application at a lower position of the shaft.

[0027] Fig. 3 is a schematic cross-sectional view of the present application at an upper position of the shaft.

[0028] Fig. 4 is a schematic cross-sectional view of the present application at a lower position of the shaft.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, receiving hopper; 2, chute; 3, fixed frame; 4, first chute; 5, mounting bracket; 6, second chute; 7, distributor; 8, support platform; 9, first construction platform; 10, second construction platform; 11, third construction platform; 12, cat ladder; 13, auxiliary platform; 14, telescopic truss; 15, telescopic jack; 16, support rod; 17, through-type jack; 18, cross rib; 19, outrigger; 20, bolt; 21, shaft; 22, concrete layer.

[0031] This specification includes reference to“one embodiment” or“the embodiment.” Occurrences of the phrases“in one embodiment” or“in an embodiment” do not necessarily refer to the same embodiment. Particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0032] “includes”, this term is open. As used in the appended claims, this term does not exclude additional structures or steps.

[0033] “first”,“second”, and the like. As used herein, these terms are merely labels applied to the various features and components throughout this disclosure, and are not intended to convey meaning as to order, quantity, or importance of the features or components. DETAILED DESCRIPTION

[0034] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme of the present application will be further explained in combination with specific embodiments.

[0035] Embodiment one:

[0036] In combination with Figs. 1 to 4As shown, the embodiment includes a sliding formwork device of a shaft, and the sliding formwork device is mainly applied to a funnel-shaped shaft 21, i.e., the cross section of the shaft 21 is trapezoidal. The device includes a support platform 8, a distribution mechanism, a platform telescopic mechanism and a platform lifting mechanism. The top of the support platform 8 is provided with the distribution mechanism, and the support platform 8 is provided with a plurality of platform telescopic mechanisms. The platform telescopic mechanisms are arranged along the radial direction of the support platform 8, and are uniformly distributed in the circumferential direction of the central axis of the support platform 8. The outer edge end of the platform telescopic mechanism close to the inner wall of the shaft 21 is provided with the platform lifting mechanism, and the platform lifting mechanism corresponds to the platform telescopic mechanism one by one. The platform lifting mechanism is at least partially embedded in the inner wall of the shaft 21, and the inner wall of the shaft 21 can provide vertical support for the platform lifting mechanism and the support platform 8. The platform telescopic mechanism can abut against the inner wall of the shaft 21 through telescopic movement and form an auxiliary platform 13. The auxiliary platform 13 cooperates with the support platform 8 to form a working platform for the operation of the shaft 21. The platform lifting mechanism can lift the height of the working platform under the support of the inner wall of the shaft 21.

[0037] In some embodiments, the platform telescopic mechanism includes a telescopic truss 14, a first driving member and a telescopic connecting assembly. A first sliding groove is arranged in the radial direction in the support platform 8, and the telescopic truss 14 is slidably connected in the first sliding groove. The telescopic truss 14 has a truss structure and has good structural strength. The support platform 8 is provided with the first driving member connected with the telescopic truss 14. The first driving member is used to drive the telescopic truss 14 to telescope along the first sliding groove. The end portions of adjacent telescopic trusses 14 close to the inner wall of the shaft 21 are connected through the telescopic connecting assembly. The telescopic connecting assembly can adapt to the size change of the inner wall of the shaft 21 through telescoping. Specifically, in this embodiment, the first driving member adopts a telescopic jack 15. The telescopic jack 15 is used to drive the telescopic truss 14 to telescope on the support platform 8, so that the telescopic truss 14 extends out of the support platform 8 to form an auxiliary platform 13. The auxiliary platform 13 cooperates with the support platform 8 to form a working platform for the operation of the shaft 21. The working platform can adapt to the size at each position of the funnel-shaped shaft 21, thereby facilitating the lining construction of the funnel-shaped shaft 21.

[0038] Further, the telescopic connecting assembly includes a cross rib plate 18 and an outer extension plate 19. The end portion of the telescopic truss 14 is provided with the cross rib plate 18, and the outer extension plate 19 is arranged between adjacent cross rib plates 18. The side of the outer extension plate 19 facing the inner wall of the shaft 21 is provided with a second sliding groove, and the two adjacent cross rib plates 18 are slidably connected in the second sliding groove of the outer extension plate 19. The cross rib plate 18 and the outer extension plate 19 are fixed through a fixing member. Specifically, in this embodiment, the fixing member adopts a bolt 20. The bolt 20 is inserted into the second sliding groove to fixedly connect the outer extension plate 19 and the cross rib plate 18.

[0039] The adjacent two telescopic trusses 14 are connected together by the telescopic connecting assembly, which enhances the structural strength of the auxiliary platform 13 formed by the telescopic trusses 14. The lateral pressure of the concrete on the formwork during the pouring of the inner wall of the shaft 21 is borne by the cooperation between the telescopic trusses 14, the telescopic jacks 15 and the telescopic connecting assembly in the platform telescopic mechanism. When the height of the slip-form device changes in the shaft 21, the inner diameter of the shaft 21 also changes accordingly. The telescopic trusses 14 are telescoped on the support platform 8, and the relative sliding between the cross ribs 18 and the outrigger plates 19 can be generated to adapt to the size change of the inner wall of the shaft 21. When the telescopic trusses 14 are telescoped to the corresponding positions, the bolts 20 between the cross ribs 18 and the outrigger plates 19 are tightened to lock the positions of the telescopic trusses 14 and the telescopic connecting assembly.

[0040] In some embodiments, the platform lifting mechanism includes the support rods 16 and the second driving members. The end of each telescopic truss 14 is provided with a corresponding second driving member. The support rods 16 are connected to the second driving members one by one. The support rods 16 are arranged along the length direction of the shaft 21. The bottom of the support rod 16 is at least partially embedded in the concrete layer 22 of the inner wall of the shaft 21. The second driving members are used to lift the height of the working platform along the support rods 16. In this embodiment, the second driving members are the through jacks 17. The through jacks 17 are fixedly installed at the ends of the telescopic trusses 14. The support rods 16 can pass through the through jacks 17. The support rods 16 are embedded in the concrete layer 22 of the inner wall of the shaft 21 in the subsequent operation.

[0041] The platform lifting mechanism is not only the lifting structure of the whole device, but also the load-bearing device of the whole device. Since the support rods 16 are partially embedded in the concrete layer 22, the main vertical load is transmitted to the concrete through the support rods 16. The operation of the through jacks 17 can drive the working platform to rise and fall in the shaft 21. The cooperation of the through jacks 17 and the telescopic jacks 15 enables the working platform to rise and fall in the funnel-shaped shaft 21 while maintaining cooperation with various positions in the shaft 21. After the lining work of the inner wall of a certain section of the shaft 21 is completed and the working platform is moved upward, the lower support rod 16 is embedded in the concrete layer 22, so that the support rod 16 and the working platform have good connection strength.

[0042] In some embodiments, the material distribution mechanism includes the receiving hopper 1 and the chute 2. The chute 2 is installed on the inner wall of the shaft 21 near the inlet end through the fixed frame 3. The inlet end of the chute 2 is provided with the receiving hopper 1. The outlet end of the chute 2 faces the inner wall of the shaft 21.

[0043] The chute 2 is fixed on the inner wall of the shaft 21 by the fixed frame 3, so as to avoid the movement of the chute 2 on the inner wall of the shaft 21. The construction personnel guide the concrete slurry into the receiving hopper 1 on the ground, and the concrete slurry flows into the shaft 21 through the receiving hopper 1 and the chute 2.

[0044] Further, the distributing mechanism further comprises the first chute 4, the distributor 7, the mounting bracket 5 and the plurality of second chutes 6. The top of the support platform 8 is provided with the mounting bracket 5, the top of the mounting bracket 5 is provided with the distributor 7, the first end of the first chute 4 is arranged below the outlet end of the chute pipe 2, the second end of the first chute 4 is arranged at the inlet end of the distributor 7, the first end of the plurality of second chutes 6 is arranged at the outlet end of the distributor 7, and the second end of the plurality of second chutes 6 is arranged at the inner wall of the shaft 21. The second chutes 6 can be used to transport the material to the inner wall of the shaft 21.

[0045] When the concrete slurry is provided into the shaft 21, the concrete slurry flows from the outlet end of the chute pipe 2 into the distributor 7 through the first chute 4, and then is evenly filled on the inner wall of the shaft 21 through the distributor 7 and the second chutes 6.

[0046] In some embodiments, the first construction platform 9 is arranged on the auxiliary platform 13, the second construction platform 10 is arranged above the auxiliary platform 13, the third construction platform 11 is arranged below the auxiliary platform 13, the first construction platform 9, the second construction platform 10 and the third construction platform 11 are connected through the ladder 12, and the ladder 12 can be used to facilitate the movement of the construction personnel between the platforms. The first construction platform 9 is used for the lining work of the concrete slurry by the construction personnel, the second construction platform 10 is used for the lengthening work of the support rod 16 and the reinforcing bar by the construction personnel, and the third construction platform 11 is used for the lining and finishing work by the construction personnel.

[0047] Embodiment two:

[0048] The embodiment is a construction method for pouring concrete on the inner wall of a funnel-shaped shaft. The method uses the slip-form device of the shaft as described in embodiment one, and comprises the following steps:

[0049] A plurality of support rods 16 are fixedly arranged on the bottom of the shaft 21 along the circumferential direction of the shaft 21;

[0050] The slip-form device is arranged in the shaft 21, and the support rods 16 pass through the through-type jacks 17 around the auxiliary platform 13;

[0051] The construction personnel on the ground fills the concrete slurry into the receiving hopper 1, and the concrete slurry is evenly filled on the inner wall of the shaft 21 through the chute pipe 2, the first chute 4, the distributor 7 and the second chutes 6;

[0052] The construction personnel on the first construction platform 9 performs the lining work of the concrete slurry, the construction personnel on the second construction platform 10 performs the lengthening work of the support rod 16 and the reinforcing bar, and the construction personnel on the third construction platform 11 performs the lining and finishing work;

[0053] After the lining work of the inner wall of the shaft 21 is completed, the through jack 17 and the telescopic jack 15 are controlled to operate synchronously, so that the support platform 8 moves upward, and the auxiliary platform 13 extends outward to the support platform 8 and cooperates with the inner wall of the shaft 21;

[0054] After reaching the appropriate position, the bolts 20 on the extension plate 19 are tightened;

[0055] After the lining work of the inner wall of the shaft 21 is completed, the bolts 20 on the extension plate 19 are loosened, and the through jack 17 and the telescopic jack 15 are controlled to operate synchronously to drive the support platform 8 to continue to move upward;

[0056] The above steps are repeated, and the cycle is repeated until the lining construction of the inner wall of the shaft 21 is completed.

[0057] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A slipform apparatus for a shaft, characterized by The utility model relates to a kind of vertical shaft working platform, including: Support platform (8), its top is equipped with cloth mechanism; Platform telescopic mechanism, it is located on the support platform (8), the platform telescopic mechanism is arranged along the radial of the support platform (8), the platform telescopic mechanism is uniformly distributed around the central axis of the support platform (8), the platform telescopic mechanism can be abutted to the inner wall of shaft (21) by telescopic motion and form auxiliary platform (13), the auxiliary platform (13) is formed with the support platform (8) and forms the working platform of the shaft (21) operation; Platform lifting mechanism, it is located at the outer edge end of the platform telescopic mechanism, the platform lifting mechanism is one-to-one corresponding with the platform telescopic mechanism, the platform lifting mechanism is at least partially embedded in the inner wall of the shaft (21), the platform lifting mechanism can support the height of the working platform under the inner wall of the shaft (21).

2. A slipform apparatus for a shaft as claimed in claim 1, wherein: The platform telescopic mechanism includes telescopic truss (14), first drive and telescopic connection component, the first sliding groove is arranged in the radial direction in the support platform (8), the telescopic truss (14) is slidably connected in the first sliding groove, the first drive connected with the telescopic truss (14) is installed in the support platform (8), the first drive is used to drive the telescopic truss (14) to be telescopic along the first sliding groove, the end of adjacent telescopic truss (14) is connected through the telescopic connection component, the telescopic connection component can be telescopic to adapt to the size change of the inner wall of the shaft (21).

3. A slipform for a shaft as claimed in claim 2, wherein: The telescopic connection component includes cross rib plate (18) and outer extension plate (19), the end of the telescopic truss (14) is provided with the cross rib plate (18), the outer extension plate (19) is arranged between adjacent cross rib plates (18), the second sliding groove is made on the side of the outer extension plate (19) towards the inner wall of the shaft (21), and the second sliding groove is slidably connected with the adjacent two cross rib plates (18), and the cross rib plate (18) and the outer extension plate (19) are fixed through the fixing part.

4. A slipform for a shaft as claimed in claim 3, wherein: The fixing part adopts bolt (20), and the bolt (20) is inserted into the second sliding groove to fixedly connect the outer extension plate (19) and the cross rib plate (18).

5. A slipform for a shaft as claimed in claim 2, wherein: The first drive adopts telescopic jack (15).

6. A slipform apparatus for a shaft according to claim 1, wherein: The platform lifting mechanism includes support rod (16) and second drive, the end of the telescopic truss (14) is correspondingly provided with the second drive, the support rod (16) is connected with the second drive one by one, the support rod (16) is arranged along the length direction of the shaft (21), and the bottom of the support rod (16) is at least partially embedded in the concrete layer (22) of the inner wall of the shaft (21), and the second drive is used to raise the height of the working platform along the support rod (16).

7. A slipform apparatus for a shaft as claimed in claim 6, wherein: The second drive adopts through-hole type jack (17), and the support rod (16) is connected inside the through-hole type jack (17).

8. A slipform apparatus for a shaft according to claim 1, wherein: The cloth mechanism comprises a receiving hopper (1), a chute (2), and a fixing frame (3), the chute (2) is installed on the inner wall of the shaft (21) near the inlet end through the fixing frame (3), the inlet end of the chute (2) is provided with the receiving hopper (1), and the outlet end of the chute (2) faces the inner wall of the shaft (21).

9. A slipform for a shaft as claimed in claim 8, wherein: The cloth mechanism further comprises a first chute (4), a distributor (7), a mounting bracket (5), and a plurality of second chutes (6), the distributor (7) is installed on the top of the support platform (8) through the mounting bracket (5), the first end of the first chute (4) is arranged below the outlet end of the chute (2), the second end of the first chute (4) is arranged at the inlet end of the distributor (7), the first ends of the plurality of second chutes (6) are arranged at the outlet end of the distributor (7), and the second ends of the plurality of second chutes (6) are arranged at the inner walls around the shaft (21).

10. A slipform apparatus for a shaft according to claim 1, wherein: The auxiliary platform (13) is provided with a first construction platform (9), the top of the auxiliary platform (13) is provided with a second construction platform (10), and the bottom of the auxiliary platform (13) is provided with a third construction platform (11), and the first construction platform (9), the second construction platform (10), and the third construction platform (11) are connected through a ladder (12); The first construction platform (9) is used for lining work of the concrete slurry by the construction personnel, the second construction platform (10) is used for lengthening work of the reinforcing steel bars by the construction personnel, and the third construction platform (11) is used for lining and troweling work by the construction personnel.