A whole prefabricated pit free-form structure and its construction method

Abstract

The application relates to the technical field of building construction, and discloses a whole prefabricated well pit formwork-free structure and a construction method thereof, which comprises a prefabricated well pit bottom die, the top of the prefabricated well pit bottom die is fixedly provided with a horizontally-arranged fixing table, a prefabricated well pit FPR lining is arranged on the fixing table, the bottom of the prefabricated well pit FPR lining extends to the inside of the prefabricated well pit bottom die, and a concrete layer is filled in the gap between the prefabricated well pit bottom die and the prefabricated well pit FPR lining; a convex strip is slidably arranged on the prefabricated well pit bottom die, and the bottom end of the convex strip extends to the inside of the prefabricated well pit bottom die. The whole prefabricated well pit formwork-free structure and the construction method thereof can reduce the stripping structure, thereby improving the prefabrication efficiency, improving the prefabricated structure aiming at the difficulty of whole prefabrication of a large well pit, guaranteeing the setting speed of the well pit concrete, ensuring the forming quality of the prefabricated well pit, and guaranteeing the installation reliability and stability of the prefabricated well pit.

Description

Technical Field

[0001] This invention relates to the technical field of building construction, and in particular to an integral precast pit structure that does not require formwork removal and its construction method. Background Technology

[0002] Precast manholes are standardized underground well structures that are prefabricated in a factory. After modular design and industrialized production, they are transported to the construction site for rapid assembly or direct installation. Their core features are "integration" and "prefabrication".

[0003] Due to the limitations of the size of the pit, the overall prefabrication also results in a larger prefabricated mold. The number of parts to be removed from the prefabricated mold is also often increased. This makes the demolding process of the overall prefabricated pit cumbersome and complicated, and it is easy to damage the main body of the pit during the demolding process. In addition, the overall prefabricated pit cannot be adjusted as easily as the spliced ​​pit during the actual installation process, resulting in some gaps between the overall prefabricated pit and the foundation pit during construction, which causes certain problems for the installation of the overall prefabricated pit. Summary of the Invention

[0004] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide an integral precast pit without demolding structure and its construction method, which can reduce the demolding structure, thereby improving the precasting efficiency, ensuring the accelerated solidification speed of pit concrete, ensuring the forming quality of precast pit, and ensuring the installation reliability and stability of precast pit.

[0005] To achieve the above objectives, the present invention employs the following technical measures:

[0006] The present invention relates to an integral precast pit formwork-free structure, comprising a precast pit bottom formwork, a horizontally placed fixing platform fixedly installed on the top of the precast pit bottom formwork, a precast pit FPR lining provided on the fixing platform, the bottom of the precast pit FPR lining extending into the interior of the precast pit bottom formwork, and a concrete layer filling the gap between the precast pit bottom formwork and the precast pit FPR lining; uniformly distributed through holes are formed on the precast pit FPR lining, and uniformly distributed reinforcing bars are fixedly installed on the precast pit FPR lining, the reinforcing bars being inserted into the inner side of the through holes. The bottom of the precast FPR lining for the well pit has evenly distributed ventilation holes. Four supports are fixedly installed at the bottom of the precast FPR lining for the well pit. The bottom end of each support is fixedly connected to a pad. The height between the support and the pad is the same as the thickness of the bottom of the precast concrete layer, and the bottom of the pad is in contact with the bottom mold of the precast well pit. A convex strip is slidably installed on the bottom mold of the precast well pit. The bottom end of the convex strip extends into the interior of the bottom mold of the precast well pit. Evenly distributed fixing ear plates are fixedly installed on the top of the precast FPR lining for the well pit. The fixing platform is fixedly connected to the fixing ear plates by bolts.

[0007] Preferably, the unoccupied position of the through hole is spaced apart from the position where the reinforcing bar is installed in the through hole, and the diameter of the through hole is less than one centimeter.

[0008] Furthermore, the number of the protrusions is set to one or more according to the volume of the precast pit, and the protrusions are evenly distributed on the inner side of the bottom mold of the precast pit.

[0009] Preferably, the bottom of the precast pit bottom mold is provided with uniformly distributed guide holes, a spring is fixedly installed inside the guide hole, a top block is fixedly installed on the top of the spring and slidably connected to the inside of the guide hole, and the bottom of the protrusion extends into the inside of the guide hole and contacts the top block.

[0010] Furthermore, two U-shaped steel bars are inserted into the precast FPR lining of the well pit, which are symmetrically arranged on the left and right sides and are located above the inner wall of the precast FPR lining.

[0011] Accordingly, the present invention also provides a construction method for an integral precast pit structure that does not require formwork removal, the steps of which are as follows:

[0012] S1. Install protruding strips in the precast pit bottom mold, then hoist the precast pit FPR liner to the inside of the precast pit bottom mold, and fix the precast pit FPR liner to the precast pit bottom mold with bolts between the fixing ear plate at the top of the precast pit FPR liner and the fixing platform at the top of the precast pit bottom mold.

[0013] S2. Fill the gap between the precast pit bottom formwork and the precast pit FPR lining with concrete to form a concrete layer, and then let it stand to cure until the concrete dries and solidifies.

[0014] S3. Vibrate the protruding strip to separate it from the concrete, then pull out the protruding strip, remove the connecting bolts between the fixed ear plate and the fixed platform, and then use U-shaped steel bars to lift the precast pit out to obtain the finished product;

[0015] S4. After transporting the precast pit to the designated construction location, lower it and adjust the level of the precast pit, using a support system to maintain the hoisting state.

[0016] S5. Fill the gap between the precast well pit and the foundation pit with filler material through the groove formed by the protrusions on the precast well pit until the filling construction is completed and the hoisting support is removed to complete the construction.

[0017] Furthermore, in step S2, the U-shaped steel bars of the precast pit FPR lining are inserted into the concrete before the concrete has fully hardened.

[0018] Based on the above, the beneficial effects of the prefabricated manhole structure and its construction method of the present invention are as follows:

[0019] 1. Improve the prefabrication template structure of the overall prefabricated pit to reduce demolding structure and thus improve prefabrication efficiency. In view of the difficulty of prefabricating large pits as a whole, the prefabrication structure is improved to ensure the accelerated solidification speed of the pit concrete while ensuring the forming quality of the prefabricated pit.

[0020] 2. Improve the outer surface structure of the precast pit, so that secondary construction can be carried out on the gaps during the construction and installation of the precast pit, so as to ensure the reliability and stability of the installation of the precast pit. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0022] Figure 1 This is a schematic diagram of the prefabricated structure of the integral well pit of the present invention;

[0023] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0024] Figure 3 This is a schematic diagram of the construction structure of the precast well pit of the present invention;

[0025] Figure 4 This is a schematic diagram of the construction process of the present invention.

[0026] Explanation of the labels in the diagram:

[0027] 1. Precast pit bottom formwork; 11. Guide hole; 12. Spring; 13. Top block; 2. Fixing platform; 3. Precast pit FPR lining; 31. U-shaped steel bar; 4. Vent hole; 5. Foot support; 6. Pad plate; 7. Raised strip; 8. Fixing ear plate; 9. Through hole. Detailed Implementation

[0028] Below, in conjunction with Figures 1 to 4 This invention provides a detailed description of the prefabricated manhole structure that requires no formwork removal and its construction method.

[0029] like Figure 1-3 As shown, the integral precast pit formwork-free structure of the present invention includes a precast pit bottom mold 1, a horizontally placed fixing platform 2 fixedly installed on the top of the precast pit bottom mold 1, a precast pit FPR liner 3 provided on the fixing platform 2, the bottom of the precast pit FPR liner 3 extending into the interior of the precast pit bottom mold 1, and the gap between the precast pit bottom mold 1 and the precast pit FPR liner 3 being filled with a concrete layer.

[0030] The precast FPR lining 3 of the well pit has evenly distributed through holes 9. Evenly distributed steel bars are fixedly installed on the precast FPR lining 3 of the well pit, and the steel bars are inserted into the inside of the through holes 9. Evenly distributed ventilation holes 4 are opened at the bottom of the precast FPR lining 3 of the well pit. Four foot supports 5 are fixedly installed at the bottom of the precast FPR lining 3 of the well pit. The bottom end of the foot support 5 is fixedly connected to the pad 6. The height between the foot support 5 and the pad 6 is the same as the thickness of the bottom of the precast concrete layer, and the bottom of the pad 6 is in contact with the bottom formwork 1 of the precast well pit.

[0031] The precast pit FPR liner 3 and the precast pit bottom mold 1 are combined to form the general shape of the precast pit. The through holes 9 on the precast pit FPR liner 3 provide fixed installation positions for the reinforcing bars, which facilitates the setting of a reinforcing bar skeleton in the concrete to enhance the structural strength of the precast pit and improve the reliability of the connection between the precast pit FPR liner 3 and the concrete. The through holes 9 without reinforcing bars installed have a ventilation function, which facilitates the evaporation of moisture in the concrete and the entry of air, thereby improving the setting efficiency and curing convenience of the concrete.

[0032] The height between the foot support 5 and the pad 6 limits the gap between the bottom of the precast pit FPR liner 3 and the precast pit bottom mold 1, ensuring that the thickness of the precast pit bottom plate meets the requirements. At the same time, it plays a supporting and limiting role when the precast pit FPR liner 3 is placed, so as to ensure the stability of the precast pit FPR liner 3.

[0033] The empty positions of the through holes 9 and the positions where the reinforcing bars are installed in the through holes 9 are spaced apart, and the diameter of the through holes 9 is less than one centimeter. The spacing between the through holes 9 for installing the reinforcing bars and the empty through holes 9 can not only meet the installation requirements of the reinforcing bar skeleton, but also facilitate the uniformity of ventilation between the concrete and the outside, so as to ensure the uniform setting speed of the overall concrete and effectively prevent concrete cracking. The diameter of the through holes 9 should not be too large to avoid excessive concrete entering the inner side of the precast pit FPR lining 3 through the through holes 9.

[0034] Two symmetrically arranged U-shaped steel bars 31 are inserted into the precast FPR lining 3 of the manhole, located above the inner wall of the precast FPR lining 3. The U-shaped steel bars 31 provide two support points with the inner wall of the precast manhole, facilitating hoisting during transportation and improving the ease and efficiency of construction. Ventilation holes 4 and air outlets facilitate communication between the bottom concrete and the outside, promoting faster solidification.

[0035] In addition, a raised strip 7 is slidably installed on the precast pit bottom mold 1, and the bottom end of the raised strip 7 extends into the interior of the precast pit bottom mold 1. A uniformly distributed fixed ear plate 8 is fixedly installed on the top of the precast pit FPR liner 3, and the fixed platform 2 is fixedly connected to the fixed ear plate 8 by bolts.

[0036] By setting a protruding strip 7 in the inner wall of the precast pit bottom mold 1 before the precast pit is constructed, it has the following two functions:

[0037] During the prefabrication stage, before the prefabricated pit is lifted out of the prefabricated pit bottom formwork 1, the protrusion 7 can be removed to create a gap between the prefabricated pit bottom formwork 1 and the concrete, allowing air to enter and thus reducing the resistance to the separation of the prefabricated pit bottom formwork 1 from the concrete.

[0038] During the construction phase, the groove formed by the protrusion 7 on the outer surface of the precast pit can provide a filling channel for subsequent filling of the gaps, so as to ensure the complete bonding between the precast pit and the foundation pit and improve the stability of the precast pit installation.

[0039] The number of protruding strips 7 is set to one or more according to the volume of the precast pit, and the protruding strips 7 are evenly distributed on the inner side of the bottom mold 1 of the precast pit; the number of protruding strips 7 is adaptively determined according to the size of the precast pit, so as to meet the filling gap requirements during the construction stage.

[0040] The bottom of the precast pit bottom mold 1 is provided with evenly distributed guide holes 11. A spring 12 is fixedly installed inside the guide hole 11. A top block 13 is fixedly installed on the top of the spring 12 and slidably connected to the inside of the guide hole 11. The bottom of the protrusion 7 extends into the inside of the guide hole 11 and contacts the top block 13.

[0041] The guide hole 11 provides the installation position and guides the protrusion 7, while the spring 12 exerts an upward force on the top block 13, preventing the protrusion 7 from being fully inserted into the guide hole 11. This allows the protrusion 7 to have downward space, which facilitates vibration of the protrusion 7 during subsequent removal. This provides the protrusion 7 with a certain sliding vibration space, which is beneficial for the separation of the protrusion 7 from the concrete and facilitates the removal of the protrusion 7.

[0042] like Figure 4 As shown, correspondingly, the present invention also provides a construction method for the expansion joint structure of an indoor ski resort as described above, the construction method comprising:

[0043] S1. Install the protruding strip 7 in the precast pit bottom mold 1, then hoist the precast pit FPR liner 3 to the inside of the precast pit bottom mold 1, and fix the precast pit FPR liner 3 to the precast pit bottom mold 1 with the bolts between the fixing ear plate 8 on the top of the precast pit FPR liner 3 and the fixing platform 2 on the top of the precast pit bottom mold 1.

[0044] S2. Concrete is filled into the gap between the precast pit bottom formwork 1 and the precast pit FPR lining 3 to form a concrete layer, and then left to cure until the concrete dries and solidifies. The U-shaped steel bars 31 of the precast pit FPR lining 3 are inserted into the concrete before the concrete is completely solidified.

[0045] S3. Vibrate the protruding strip 7 to separate it from the concrete, then pull out the protruding strip 7, remove the connecting bolts between the fixed ear plate 8 and the fixed platform 2, and then lift the precast pit out through the U-shaped steel strip 31 to obtain the finished product.

[0046] S4. After transporting the precast pit to the designated construction location, lower it down and adjust the level of the precast pit. The support should be used to maintain the hoisting state. The support can be a traditional fixed triangular support, which is connected to the precast pit by a hoisting rope or steel wire to support the precast pit.

[0047] S5. Fill the gap between the precast well pit and the foundation pit with filler material through the groove formed by the protrusion 7 on the precast well pit until the filling construction is completed and the hoisting support is removed to complete the construction. The filler material can be concrete, etc.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention.

Claims

1. A precast well pit structure that does not require demolding, comprising a precast well pit bottom mold (1), characterized in that: A horizontally placed fixed platform (2) is fixedly installed on the top of the precast pit bottom mold (1). A precast pit FPR liner (3) is provided on the fixed platform (2). The bottom of the precast pit FPR liner (3) extends into the interior of the precast pit bottom mold (1). The gap between the precast pit bottom mold (1) and the precast pit FPR liner (3) is filled with a concrete layer. The prefabricated well pit FPR liner (3) has evenly distributed through holes (9), and the prefabricated well pit FPR liner (3) is fixedly installed with evenly distributed steel bars, which are inserted into the inside of the through holes (9). The bottom of the prefabricated well pit FPR liner (3) has evenly distributed vent holes (4). The bottom of the precast pit FPR lining (3) is fixedly installed with four legs (5), and the bottom end of the legs (5) is fixedly connected with a pad (6). The height between the legs (5) and the pad (6) is the same as the thickness of the bottom of the precast concrete layer, and the bottom of the pad (6) is in contact with the precast pit bottom mold (1). A protruding strip (7) is slidably installed on the precast pit bottom mold (1), and the bottom end of the protruding strip (7) extends into the interior of the precast pit bottom mold (1). A uniformly distributed fixed ear plate (8) is fixedly installed on the top of the precast pit FPR liner (3), and the fixed platform (2) is fixedly connected to the fixed ear plate (8) by bolts. Two U-shaped steel bars (31) are inserted into the prefabricated pit FPR liner (3) and are arranged symmetrically on the left and right sides. The U-shaped steel bars (31) are located above the inner wall of the prefabricated pit FPR liner (3).

2. The prefabricated manhole structure without formwork removal according to claim 1, characterized in that, The vacant position of the through hole (9) is spaced apart from the position where the reinforcing bar is installed in the through hole (9), and the diameter of the through hole (9) is less than one centimeter.

3. The prefabricated manhole structure without formwork removal according to claim 1, characterized in that, The number of the protrusions (7) is set to more than one according to the volume of the precast pit, and the protrusions (7) are evenly distributed on the inner side of the bottom mold (1) of the precast pit.

4. The prefabricated manhole structure without formwork removal according to claim 1, characterized in that, The bottom of the precast pit bottom mold (1) is provided with uniformly distributed guide holes (11). A spring (12) is fixedly installed inside the guide hole (11). A top block (13) is fixedly installed on the top of the spring (12) and slidably connected to the inside of the guide hole (11). The bottom of the protrusion (7) extends into the inside of the guide hole (11) and contacts the top block (13).

5. The construction method of the integral precast pit formwork-free structure according to any one of claims 1 to 4, characterized in that, The steps are as follows: S1. Install the protruding strip (7) in the precast pit bottom mold (1), then hoist the precast pit FPR liner (3) to the inside of the precast pit bottom mold (1), and fix the precast pit FPR liner (3) to the precast pit bottom mold (1) by the bolts between the fixing ear plate (8) at the top of the precast pit FPR liner (3) and the fixing platform (2) at the top of the precast pit bottom mold (1); S2. The gap between the precast pit bottom mold (1) and the precast pit FPR lining (3) is filled with concrete to form a concrete layer, and then left to cure until the concrete dries and solidifies. S3. Vibrate the protruding strip (7) to separate it from the concrete and then pull out the protruding strip (7). Remove the connecting bolts between the fixed ear plate (8) and the fixed platform (2). Then, use the U-shaped steel strip (31) to lift out the precast pit to obtain the finished product. S4. After transporting the precast pit to the designated construction location, lower it and adjust the level of the precast pit, using a support system to maintain the hoisting state. S5. Fill the gap between the precast well pit and the foundation pit with filler material through the groove formed by the protrusion (7) on the precast well pit until the filling construction is completed and the hoisting support is removed to complete the construction.

6. The construction method of the integral precast pit without formwork removal structure according to claim 5, characterized in that: The U-shaped steel bar (31) of the precast well pit FPR lining (3) in step S3 is inserted into the concrete before the concrete has completely solidified.

Images