Basement outer wall post-cast strip fat groove backfill operation well and construction method

Abstract

The invention discloses a basement exterior wall post-cast strip fat groove backfill operation well and a construction method, the operation well comprises a trapezoid enclosure plate, the bottom edge of the trapezoid enclosure plate is open, so that when the two side edges of the trapezoid enclosure plate are fixed on a basement exterior wall, the trapezoid enclosure plate is used as a cofferdam for separating a fat groove from a post-cast strip area; one end of each of the two bent supporting plates is connected with the side edge of the trapezoidal enclosure plate, and the other end of each of the two bent supporting plates is connected with the top edge of the trapezoidal enclosure plate through a telescopic structure, so that when the telescopic structures control the bent supporting plates to partially abut against the basement exterior wall; a hexagonal supporting structure is formed between the two bent supporting plates and the top edge and the side edge of the trapezoid structure, and the two bent supporting plates abut against the basement outer wall part to jointly serve as an outer side formwork of the post-cast strip area. The structure is simple, operation is convenient, and the problems that the traditional construction period is long, the post-cast strip formwork is difficult to install, and the concrete forming quality is affected due to poor installation quality can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to an operation well for backfilling the fat groove of the post-cast strip of the basement exterior wall and a construction method thereof. Background Art

[0002] The basement fat groove refers to the part that is excavated more to provide a construction operation surface, which is the space between the exterior wall or foundation of the building and the edge of the foundation pit. The backfilling of the fat groove is an important process in building construction. Under traditional construction conditions, it is necessary to complete the main structure of the basement, and after the concrete curing time on both sides of the post-cast strip is not less than 42 days and the relevant processes of the post-cast strip are completed, then the fat groove backfilling treatment is carried out. Whether the fat groove backfilling is completed will directly affect the construction progress of the subsequent ground structure, and backfilling the fat groove according to traditional construction conditions will cause a large delay in the construction period. In addition, the construction quality of the post-cast strip of the basement exterior wall seriously affects the waterproof effect of the basement, and the limited space of the fat groove often makes it difficult to set up or remove the formwork of the post-cast strip. It is inconvenient to transport materials up and down and there are safety hazards, which in turn affect the concrete forming quality, often easily lead to water leakage of the basement exterior wall and difficult maintenance, consume more labor, and have poor economy.

[0003] In view of this, it is necessary to design an operation well for backfilling the fat groove of the post-cast strip of the basement exterior wall and a construction method thereof to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an operation well for backfilling the fat groove of the post-cast strip of the basement exterior wall and a construction method thereof to solve the problems of long traditional construction period, difficult installation of the formwork of the post-cast strip, and poor installation quality affecting the concrete forming quality.

[0005] To achieve the above invention purpose, the present invention provides an operation well for backfilling the fat groove of the post-cast strip of the basement exterior wall, including: A trapezoidal retaining plate, the bottom edge of the trapezoidal retaining plate is open, so that when the two side edges of the trapezoidal retaining plate are fixed on the basement exterior wall, the trapezoidal retaining plate serves as a cofferdam separating the fat groove from the post-cast strip area; Bent support plates, both ends of the two bent support plates are connected to the side edges of the trapezoidal retaining plate, and the other ends are connected to the top edge of the trapezoidal retaining plate through a telescopic structure, so that when the telescopic structure controls the bent support plates to partially abut against the basement exterior wall, a hexagonal support structure is formed between the two bent support plates and the top edge and side edges of the trapezoidal structure. Among them, the parts where the two bent support plates abut against the basement exterior wall together serve as the outer formwork of the post-cast strip area.

[0006] As a further improvement of the present invention, the trapezoidal retaining plate is an isosceles trapezoidal structure.

[0007] As a further improvement of the present invention, along a direction parallel to the outer wall of the basement, the length of the top edge of the trapezoidal enclosure plate is greater than the length of the post-cast zone.

[0008] As a further improvement of the present invention, the distance between the connection point between the bent support plate and the side of the trapezoidal enclosure plate and the connection point between the side of the trapezoidal enclosure plate and the basement outer wall is 1 / 3-1 / 2 of the length of the side of the trapezoidal enclosure plate.

[0009] As a further improvement of the present invention, when the bent support plate is partially abutted against the outer wall of the basement, the bent support plate includes an inclined section obliquely downward along a direction close to the center of the trapezoidal retaining plate and a straight section connected to the inclined section and abutting against the outer wall of the basement, wherein the acute angle formed by the inclined section and the outer wall of the basement is equal to the bottom angle of the trapezoidal retaining plate.

[0010] As a further improvement of the present invention, a clamping portion is provided at one end of the two bent support plates close to each other so that the connection parts of the two bent support plates form a dense planar structure.

[0011] As a further improvement of the present invention, two first vertical stiffening keels are arranged on the top edge of the trapezoidal enclosure plate for enhancing the strength and rigidity of the trapezoidal enclosure plate and providing a fulcrum for the telescopic structure.

[0012] As a further improvement of the present invention, when a hexagonal support structure is formed between the two bent support plates and the top and side edges of the trapezoidal structure, the two telescopic structures are located in the middle of the hexagonal support structure.

[0013] As a further improvement of the present invention, a ladder is provided at a portion of the top edge of the trapezoidal enclosure plate located between the two telescopic structures.

[0014] The present invention also provides a construction method for backfilling an operation well of a fertilizer trough in a post-cast zone of a basement outer wall, comprising the following steps: S1. Fix both sides of the trapezoidal enclosure board on the outer wall of the basement so that the trapezoidal enclosure board serves as a cofferdam to separate the fertilizer trough from the post-casting zone; then backfill the fertilizer trough in layers; S2. Adjust the telescopic structure so that the bent support plate part abuts against the outer wall of the basement, so that the two bent support plates abut against the outer wall of the basement and serve together as the outer formwork of the post-casting zone, and set the inner formwork connected to the outer formwork through the fastening structure on the side of the post-casting zone away from the fertilizer trough, and complete the formwork construction of the post-casting zone; then pour the concrete in the post-casting zone; S3. After the requirements for formwork removal are met, the inner formwork is removed, and the bent support plate is moved away from the basement outer wall through the telescopic structure, and then waterproofing construction of the post-casting zone is carried out.

[0015] As a further improvement of the present invention, after the waterproof construction is completed and the maintenance requirements of the post-cast strip are met, the operation well is removed, and the area where the operation well is located is backfilled.

[0016] The beneficial effects of the present invention are as follows: 1. By respectively arranging on both side edges of the trapezoidal retaining plate the bent support plates with one end connected to the side edge of the trapezoidal retaining plate and the other end connected to the top edge of the trapezoidal retaining plate through the telescopic structure, under the action of the telescopic structure, part of the bent support plate abuts against the basement exterior wall, so that a hexagonal support structure is formed between the two bent support plates and the top edge and side edge of the trapezoidal retaining plate. The trapezoidal retaining plate can not only serve as a cofferdam to facilitate the early backfilling of the fat groove, but also jointly form a formwork structure with the bent support plates, further utilizing the soil pressure of the backfilled soil in the fat groove and the supporting force of the basement exterior wall to ensure the stability of the formwork structure, thus solving the problem that the formwork installation quality of the post-cast strip in traditional construction is poor and affecting the concrete forming quality, and effectively improving the quality of the post-cast strip concrete and the waterproof effect.

[0017] 2. The connection setting of the bent support plate and the trapezoidal retaining plate in the present invention, combined with the adjustment design of the telescopic structure for the bent support plate, makes it unnecessary to additionally install a formwork for post-cast strip concrete pouring in the operation well, reducing the up and down handling of materials, with simple operation, labor saving, improving the construction efficiency, and at the same time ensuring the construction safety.

[0018] 3. The bent structure setting of the bent support plate, in addition to facilitating the formation of a hexagonal support structure with the trapezoidal retaining plate to improve stability, can also adjust the bent support plate through the telescopic structure in the later stage, so that a larger construction space is formed on the side of the post-cast strip area close to the retaining plate, facilitating subsequent waterproof construction and improving the construction convenience.

[0019] 4. By setting an operation well to enclose the side of the fat groove in the post-cast strip area of the basement exterior wall, and then carrying out the post-cast strip construction after the fat groove is backfilled, compared with the traditional method of backfilling the fat groove after the basement main structure and the post-cast strip construction are completed, it avoids the influence of the post-cast strip construction on the subsequent construction progress and greatly shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a plan view of installing the operation well for backfilling the fat groove of the post-cast strip of the basement exterior wall on the basement exterior wall.

[0021] Figure 2 It is an elevation view of the segmented setting of the bent support plate.

[0022] Figure 3 It is a structural diagram of the bent support plate.

[0023] Figure 4Schematic diagram of the telescopic structure.

[0024] Figure 5 Plan schematic diagram of the bent support plate as the outer formwork.

[0025] Figure 6 Elevation schematic diagram of the bent support plate as the outer formwork.

[0026] Figure 7 Plan schematic diagram of the formwork erection in the post-cast strip area being completed.

[0027] Figure 8 Elevation view of the formwork erection in the post-cast strip area being completed.

[0028] Reference numerals 11. Support structure; 12. Exterior basement wall; 13. Backfill trench; 14. Post-cast strip area; 20. Trapezoidal retaining plate; 21. Widened cushion plate; 22. First vertical stiffening keel; 30. Bent support plate; 31. Oblique section; 32. Straight section; 33. First clamping section; 34. Second clamping section; 35. Second vertical stiffening keel;; 40. Telescopic structure; 41. Connecting block; 42. Sleeve rod; 43. Screw rod; 44. Adjusting knob; 45. Pin; 50. Inner formwork; 60. Ladder; 71. Steel pipe; 72. Waterstop screw; 80. Waterstop steel plate. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Here, it should also be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0031] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0032] As Figure 1 shown, the present invention provides an operation well for backfilling the trench of the post-cast strip of the exterior basement wall, including: A trapezoidal retaining plate 20, the bottom edge of the trapezoidal retaining plate 20 being open, such that when the two side edges of the trapezoidal retaining plate 20 are fixed on the exterior basement wall 12, the trapezoidal retaining plate 20 serves as a cofferdam separating the backfill trench 13 from the post-cast strip area 14; Bend the support plate 30. One end of each of the two bent support plates 30 is connected to the side of the trapezoidal enclosure plate 20, and the other end is connected to the top edge of the trapezoidal enclosure plate 20 through the telescopic structure 40. When the telescopic structure 40 controls the bent support plate 30 to partially abut against the basement exterior wall 12, a hexagonal support structure is formed between the two bent support plates 30 and the top edge and the side of the trapezoidal structure. Among them, the parts of the two bent support plates 30 abutting against the basement exterior wall 12 together serve as the outer formwork of the post-cast strip area 14.

[0033] Exemplarily, the trapezoidal enclosure plate 20 is an isosceles trapezoidal structure, and along the direction parallel to the basement exterior wall 12, the length of the top edge of the trapezoidal enclosure plate 20 is greater than the length of the post-cast strip area 14.

[0034] Specifically, the distance between the connection point of the bent support plate 30 and the side of the trapezoidal enclosure plate 20 and the connection point of the side of the trapezoidal enclosure plate 20 and the basement exterior wall 12 is 1 / 3 - 1 / 2 of the length of the side of the trapezoidal enclosure plate 20. Exemplarily, the distance between the connection point of the bent support plate 30 and the side of the trapezoidal enclosure plate 20 and the connection point of the side of the trapezoidal enclosure plate 20 and the basement exterior wall 12 is 1 / 3 of the length of the side of the trapezoidal enclosure plate 20. By defining the position of the connection point of the bent support plate 30 and the side of the trapezoidal enclosure plate 20, the connection point of the bent support plate 30 and the side of the trapezoidal enclosure plate 20 is made to fall on the lower part of the side of the trapezoidal enclosure plate 20, which is convenient for subsequent support by combining the soil pressure of the backfill soil in the waste pit 13 and the basement exterior wall 12, and ensures the stability of the hexagonal support structure formed by the trapezoidal enclosure plate 20 and the bent support plate 30.

[0035] Specifically, as Figure 3 and Figure 5 shown, when the bent support plate 30 is in a state of partially abutting against the basement exterior wall 12, the bent support plate 30 includes an inclined section 31 that slopes downward along the direction close to the center of the trapezoidal enclosure plate 20 and a straight section 32 that is connected to the inclined section 31 and abuts against the basement exterior wall 12. Among them, the acute angle formed by the inclined section 31 and the basement exterior wall 12 is equal to the bottom angle of the trapezoidal enclosure plate 20.

[0036] By setting the trapezoidal enclosing plate 20 as an isosceles trapezoidal structure, when the telescopic structure 40 controls the bent support plate 30 to abut against the basement exterior wall 12, a symmetrical hexagonal support structure can be formed between the bent support plate 30 and the trapezoidal enclosing plate 20. With the acute angle formed by the inclined section 31 and the basement exterior wall 12 being equal to the base angle of the trapezoidal enclosing plate 20 and the connection point between the bent support plate 30 and the side of the trapezoidal enclosing plate 20 falling on the lower part of the side of the trapezoidal enclosing plate 20, the earth pressure of the backfill soil in the fat pocket 13 and the supporting effect of the basement exterior wall 12 can be fully utilized to maintain the stability of the manhole, and then it is convenient to use the two bent support plates 30 abutting against the basement exterior wall 12 to jointly form an outer formwork with good strength and stiffness for the post-cast strip area 14, which is beneficial to the pouring construction of the post-cast strip area 14.

[0037] Specifically, as Figure 3 shown, a clamping portion for forming a dense planar structure at the connecting portion of the two bent support plates 30 is provided at one end where the two bent support plates 30 are close to each other; exemplarily, the clamping portion is provided at the end of the straight section 32 of the bent support plate 30 far from the inclined section 31, and includes a first clamping section 33 provided on one of the straight sections 32 and a second clamping section 34 correspondingly provided on the other straight section 32. When connecting, the first clamping section 33 overlaps on the second clamping section 34 to form a rectangular structure with a dense connection and in the same plane as the straight section 32.

[0038] Specifically, two first vertical stiffening keels 22 for strengthening the strength and stiffness of the trapezoidal enclosing plate 20 and providing a force application point for the telescopic structure 40 are provided on the top edge of the trapezoidal enclosing plate 20, and a second vertical stiffening keel 35 for providing a force application point for the other end of the telescopic structure 40 is correspondingly provided on the straight section 32 of the bent support plate 30. When the bent support plate 30 abuts against the basement exterior wall 12, the telescopic structure 40 is in a state perpendicular to the basement exterior wall 12 and is located in the middle of the hexagonal support structure ( Figure 5 ) so that a quadrilateral support structure formed by the telescopic structure 40, the top edge of the trapezoidal enclosing plate 20 and the bent support plate 30 is also formed in the hexagonal support structure. Furthermore, the telescopic structure 40, in addition to being used to adjust the state of the bent support plate 30, also serves as a support member for improving the stability of the formwork structure.

[0039] Exemplarily, as Figure 4As shown in the figure, the telescopic structure 40 includes a connecting block 41, a sleeve rod 42 connected to the connecting block 41 through a bearing, a screw rod 43 threadedly connected to the sleeve rod 42, and an adjusting member for driving the rotation of the sleeve rod 42. The connecting block 41 is connected to the first vertical stiffening keel 22 through a fixing member, and the screw rod 43 is connected to the second vertical stiffening keel 35 through a fixing member. Exemplarily, the fixing member is a pin 45, and the adjusting member is an adjusting knob 44 installed on the sleeve rod 42. By rotating the adjusting knob 44 to control the rotation of the sleeve rod 42, the screw rod 43 moves towards or away from the sleeve rod 42 to achieve telescoping.

[0040] Specifically, as Figure 2 shown, in this example, the bent support plate 30 is arranged in segments along the well depth direction, i.e., the vertical direction, and a telescopic structure 40 is correspondingly arranged on each segment. Exemplarily, the height of each segment of the bent support plate 30 is 1 m. By arranging the bent support plate 30 in segments along the vertical direction, it is beneficial to successively abut each bent support plate 30 against the basement exterior wall 12 to form an outer formwork, and the operation control is more convenient. Since in actual construction, after adjusting two bent support plates 30 on the same layer, the bent support plates 30 above are adjusted layer by layer upwards, and the adjustment methods of the bent support plates 30 in each layer are the same, the adjustment of the bent support plates 30 on the same layer will be taken as an example for description in the subsequent construction description.

[0041] Specifically, a ladder 60 is arranged at the part of the top edge of the trapezoidal enclosure plate 20 located between two telescopic structures 40 to facilitate controlling the telescopic structure 40 and other operations using the ladder 60.

[0042] Specifically, a widened cushion plate 21 is arranged at one end of the side edge of the trapezoidal enclosure plate 20 away from the top edge of the trapezoidal enclosure plate 20 to improve the connection stability between the trapezoidal enclosure plate 20 and the basement exterior wall 12 using the widened cushion plate 21. In addition, a flexible gasket for protecting the basement exterior wall 12 is arranged between the widened cushion plate 21 and the basement exterior wall 12, and the flexible gasket can be a rubber gasket or a nylon gasket, etc.

[0043] Specifically, both the trapezoidal enclosure plate 20 and the bent support plate 30 are made of steel.

[0044] Specifically, a reserved hole is also arranged on the straight section 32 of the bent support plate 30, which is beneficial for subsequent construction of the concrete pouring formwork in the post-cast strip area 14.

[0045] The present invention also provides a construction method for backfilling the fat pocket of the post-cast strip of the basement exterior wall. Construction is carried out after the basement exterior walls 12 on both sides of the post-cast strip are poured and initially set and cured for a certain time to have a certain strength. At this time, a fat pocket 13 is formed between the basement exterior wall 12 and the support structure 11. Operations are carried out through the above-mentioned operation well for backfilling the fat pocket of the post-cast strip of the basement exterior wall, including the following steps: S1. Fix the two side edges of the trapezoidal retaining plate 20 on the basement exterior wall 12, so that the trapezoidal retaining plate 20 serves as a cofferdam to separate the backfill trench 13 from the post-cast strip area 14. Among them, widened gaskets are arranged at the connecting parts of the two side edges of the trapezoidal retaining plate 20 and the basement exterior wall 12 to improve the connection stability, and flexible gaskets are arranged between the widened gaskets and the basement exterior wall 12 to protect the basement exterior wall 12 by using the flexible gaskets; then backfill and tamp the backfill trench 13 in layers. S2. After the basement exterior wall 12 on both sides of the post-cast strip is cured for a certain period of time until it meets the construction requirements, roughen the wall concrete, and bind steel bars in the post-cast strip area 14 for subsequent pouring of the post-cast strip area 14. S3. Adjust the telescopic structure 40 to make the two bent support plates 30 connected to the two sides of the trapezoidal retaining plate 20 in a closed state where the straight sections 32 are abutted against the basement exterior wall 12 ( Figure 5 . Figure 6 ) so that the parts of the two bent support plates 30 abutted against the basement exterior wall 12 together form the outer formwork of the post-cast strip area 14, and an inner formwork 50 connected to the outer formwork is arranged on the side of the post-cast strip area 14 away from the backfill trench 13 through a fastening structure to complete the formwork erection of the post-cast strip area 14 ( Figure 7 . Figure 8 ) ; then pour the concrete of the post-cast strip area 14. S4. After meeting the formwork removal requirements, remove the inner formwork 50, and make the bent support plates 30 away from the basement exterior wall 12 through the telescopic structure 40. Under the protection of the operation well, carry out the waterproof construction of the post-cast strip area 14, that is, carry out the construction of waterproof coiled material and extruded polystyrene board. S5. After completing the waterproof construction, when the post-cast strip maintenance requirements are met, take out the operation well and backfill the area where the operation well is located.

[0046] Specifically, a water stop steel plate 80 is arranged on the basement exterior wall 12 to improve the waterproof performance of the joint during the subsequent construction of the post-cast strip area 14.

[0047] Specifically, in the initial state, the telescopic structure 40 shrinks, so that the bent support plates 30 are located inside the trapezoidal retaining plate 20, so as to use the telescopic structure 40 as a limiting part to keep the bent support plates 30 and the trapezoidal retaining plate 20 in a relatively fixed state, which is convenient for hoisting the trapezoidal retaining plate 20 into the corresponding underground position and avoiding the bent support plates 30 from hindering the installation of the trapezoidal retaining plate 20. When the telescopic structure 40 is adjusted to make the bent support plate 30 in a closed state, so that the bent support plate 30 and the trapezoidal enclosure plate 20 form a hexagonal support structure, the two bent support plates 30 can be used to abut against the part of the basement exterior wall 12 as the outer formwork of the post-cast strip area 14. That is, in addition to being used as a cofferdam to facilitate the early backfilling of the fat pocket 13, the trapezoidal enclosure plate 20 can also jointly form a formwork support structure with the bent support plate 30. Further, by utilizing the earth pressure of the backfill soil in the fat pocket 13 and the supporting force of the basement exterior wall 12, the stability of the formwork support structure is ensured, thus solving the problem that the installation quality of the post-cast strip formwork in traditional construction is poor and affecting the concrete forming quality, and effectively improving the quality of the post-cast strip concrete and the waterproof effect.

[0048] Specifically, in step S3, the fastening structure is an existing fastening component for formwork erection, including steel pipes 71, water-stop screws 72, nuts, etc., which will not be elaborated here.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A fertilizer tank backfilling operation well for a basement exterior wall post-cast zone, characterized in that: include: A trapezoidal enclosure plate, wherein the bottom edge of the trapezoidal enclosure plate is open, so that when the two sides of the trapezoidal enclosure plate are fixed to the outer wall of the basement, the trapezoidal enclosure plate serves as a cofferdam separating the fertilizer trough from the post-casting zone; Bending support plates, each of the two bending support plates is connected to the side of the trapezoidal enclosure plate at one end and is connected to the top of the trapezoidal enclosure plate through a telescopic structure, so that when the telescopic structure controls the bending support plate to abut against the outer wall of the basement, a hexagonal support structure is formed between the two bending support plates and the top and side of the trapezoidal structure, wherein the two bending support plates abut against the outer wall of the basement and serve together as the outer formwork of the post-pouring zone.

2. The fertilizer tank backfilling operation well for the post-cast zone of the basement outer wall according to claim 1 is characterized by: The trapezoidal enclosure plate is an isosceles trapezoidal structure, and along a direction parallel to the outer wall of the basement, the length of the top edge of the trapezoidal enclosure plate is greater than the length of the post-cast zone.

3. The fertilizer tank backfilling operation well for the post-cast zone of the basement outer wall according to claim 1 is characterized by: The distance between the connection point between the bent support plate and the side of the trapezoidal enclosure plate and the connection point between the side of the trapezoidal enclosure plate and the outer wall of the basement is 1 / 3-1 / 2 of the length of the side of the trapezoidal enclosure plate.

4. The fertilizer tank backfilling operation well for the post-cast zone of the basement outer wall according to claim 3 is characterized by: When the bent support plate is partially in contact with the outer wall of the basement, the bent support plate includes an inclined section slanting downward along the center direction of the trapezoidal retaining plate and a straight section connected to the inclined section and in contact with the outer wall of the basement, wherein the acute angle formed by the inclined section and the outer wall of the basement is equal to the bottom angle of the trapezoidal retaining plate.

5. The fertilizer tank backfilling operation well for the post-cast zone of the basement exterior wall according to claim 1 is characterized in that: A clamping portion is arranged at one end of the two bent support plates close to each other, so that the connection parts of the two bent support plates form a dense plane structure.

6. The fertilizer tank backfilling operation well for the post-cast zone of the basement exterior wall according to claim 1 is characterized by: Two first vertical stiffening keels are arranged on the top edge of the trapezoidal enclosure plate, which are used to strengthen the strength and rigidity of the trapezoidal enclosure plate and provide a fulcrum for the telescopic structure.

7. The fertilizer tank backfilling operation well for the post-cast zone of the basement exterior wall according to claim 1 is characterized by: When a hexagonal support structure is formed between the two bent support plates and the top and side edges of the trapezoidal structure, the two telescopic structures are located in the middle of the hexagonal support structure.

8. The fertilizer tank backfilling operation well for the post-cast zone of the basement outer wall according to claim 1 is characterized by: A ladder is arranged on the top edge of the trapezoidal enclosure plate between the two telescopic structures.

9. A construction method for backfilling the fertilizer tank of the basement exterior wall post-cast zone according to claim 1, characterized in that: The following steps are involved: S1. Fix both sides of the trapezoidal enclosure board on the outer wall of the basement so that the trapezoidal enclosure board serves as a cofferdam to separate the fertilizer trough from the post-casting zone; then backfill the fertilizer trough in layers; S2. Adjust the telescopic structure so that the bent support plate part abuts against the outer wall of the basement, so that the two bent support plates abut against the outer wall of the basement and serve together as the outer formwork of the post-casting zone, and set the inner formwork connected to the outer formwork through the fastening structure on the side of the post-casting zone away from the fertilizer trough, and complete the formwork construction of the post-casting zone; then pour the concrete in the post-casting zone; S3. After the requirements for formwork removal are met, the inner formwork is removed, and the bent support plate is moved away from the basement outer wall through the telescopic structure, and then waterproofing construction of the post-casting zone is carried out.

10. The construction method according to claim 9, characterized in that: After completing the waterproofing construction and meeting the requirements for post-casting zone maintenance, the operating well will be removed and backfill construction will be carried out on the area where the operating well is located.

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