Vertical extension construction method for underground space of existing building

Abstract

The invention relates to the field of building transformation, and discloses an existing building underground space vertical extension construction method which comprises the following steps that an outer fixing frame and an inner fixing frame are built on the outer wall and the inner wall of an existing building correspondingly; the outer fixing frame and the inner fixing frame are connected through a plurality of opposite-pull screws and fix the root of the existing building. The interior of the existing building is preliminarily excavated in the vertical direction of the existing building, an excavated groove is formed after the interior of the existing building is excavated to a certain depth, and the multiple inner side walls of the excavated groove and the inner side wall of the inner fixing frame are arranged in a coplanar mode so that the interior space of the existing building can be enlarged; when expansion is carried out in the existing building, the blocking plate can freely fall down according to the depth of the groove, the inner side wall of the groove can be comprehensively blocked through the blocking plate, the phenomenon that soil on the side face of the groove falls off is reduced, the thickness of the foundation soil surface of the existing building is ensured, and damage to the existing building is relieved.

Description

Technical Field

[0001] This invention relates to the field of building renovation technology, specifically a method for vertical expansion of underground space in existing buildings. Background Technology

[0002] With the sustained high-speed development of the national economy over the years and the deepening of urbanization, the scale of infrastructure construction in various regions has continued to expand. Against this backdrop, available urban land resources are becoming increasingly scarce, especially in urban centers. Due to the dense existing buildings and complex underground structures, the development and construction of large-scale underground spaces faces significant constraints. Taking central cities as an example, with the continuous growth of the population, surface space can no longer meet the daily needs of residents, and commercial, residential, and municipal facilities such as shopping malls and subway stations are gradually expanding deeper underground. However, limited by factors such as insufficient early estimates of pedestrian traffic and capital costs, many underground spaces were not adequately considered for future use needs at the initial construction stage, resulting in smaller spaces that are difficult to adapt to actual needs years later.

[0003] To address these issues, the traditional solution is usually to demolish and rebuild the existing building. However, this method is not only costly but also time-consuming. Although there have been attempts to expand the usable area by excavating downwards on the foundation of the existing building, the soil on the sides of the excavation is prone to collapse during the actual expansion process. This results in a weak soil surface on the foundation of the existing building, affecting the foundation and even causing structural cracks, thus impacting its overall safety and service life.

[0004] Therefore, we propose a construction method for vertical expansion of underground space in existing buildings to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems mentioned above.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for vertical expansion of underground space in an existing building includes the following steps: S1: Construct an external fixed frame and an internal fixed frame on the exterior and interior walls of the existing building, respectively. The external fixed frame and the internal fixed frame are connected by several tie rods and fixed to the base of the existing building. S2: Initial excavation is carried out in the interior of the existing building along its vertical direction. After excavation to a certain depth, a trench is formed, and multiple inner walls of the trench are set coplanar with the inner walls of the internal fixed frame to expand the interior space of the existing building. S3: Fix several sliding mounting parts at equal intervals on the internal fixed frame, and slide the baffle plates on the several sliding mounting parts respectively; the adjacent baffle plates fit together, and each baffle plate is set to abut against the inner side wall of the trench; to prevent the soil on the inner side wall of the trench from loosening or / and falling off. S4: Secondary excavation of the initial expansion trench; the blocking plate can fall freely downward according to the depth of the trench to ensure that the blocking plate can completely block the inner wall of the trench. S5: When the space inside an existing building is extended downward to a specified depth, an inner casting formwork is built inside the excavation so that the inner casting formwork and several baffles form a casting chamber with an "open" top. S6: Pour concrete inside the casting chamber so that the concrete level is flush with the top surface of the baffle plate. S7: After the poured concrete has completely solidified, it forms the walls of the expanded space, and the internal building formwork is dismantled.

[0007] Preferably, in step S1, before installing the tie rod, holes are pre-drilled in the existing building so that the outer fixed frame and the inner fixed frame can be connected by the tie rod.

[0008] Preferably, after step S3, three adjacent baffles are fitted with the same reinforcing rod by fixing bolts to reinforce several baffles, thereby reducing unevenness between adjacent baffles.

[0009] Preferably, in step S3, when two adjacent baffles are installed, the two baffles are connected by a limiting protrusion and a limiting groove to enhance the sealing between the two baffles.

[0010] Preferably, in step 5S, multiple support frames are fixed at equal intervals on the outer wall of the inner casting formwork, and the bottom end of the support frame abuts against the inner bottom wall of the excavation to support the inner casting formwork and prevent tilting or collapse during the casting process.

[0011] Preferably, in step S5: several support rods are fixed at equal intervals between the baffle plate and the inner casting template, and the side plate is further supported by the support rods to prevent the side plate from tilting.

[0012] Preferably, in step S6, when pouring concrete into the interior of the pouring chamber, the pouring is done in multiple stages, and the concrete after each pour is vibrated with a vibrator to ensure that the concrete is compacted.

[0013] The beneficial effects of this invention are: When expanding an existing building, the present invention allows the blocking plate to fall freely downwards according to the depth of the excavation. The blocking plate can completely block the inner wall of the excavation, reducing the occurrence of soil falling from the side of the excavation, ensuring the thickness of the foundation soil surface of the existing building, reducing damage to the existing building, reducing cracking, and improving the safety and service life of the existing building. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the third cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the internal fixing frame and the blocking plate in this invention; Figure 5 This is a schematic diagram of the internal fixing frame and sliding mounting component structure in this invention; Figure 6 This is a schematic diagram of the structure of several blocking plates connected in this invention; Figure 7 This is a schematic diagram of the connection structure between the baffle plate and the inner casting template in this invention.

[0015] The names corresponding to each mark in the diagram: 1. Existing building; 2. External fixed frame; 3. Internal fixed frame; 5. Excavation; 6. Sliding installation component; 7. Blocking plate; 701. Limiting protrusion; 702. Limiting slide groove; 8. Internal casting formwork; 9. Casting chamber; 10. Reinforcing rod; 11. Support frame; 12. Support rod. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0017] A method for vertical expansion of underground space in an existing building includes the following steps: S1: An external fixed frame 2 and an internal fixed frame 3 are respectively constructed on the outer and inner walls of the existing building 1. The external fixed frame 2 and the internal fixed frame 3 are located at the base of the existing building 1 and are fitted to the existing building 1. It should be noted that: a drilled hole (not marked in the figure) is opened at the base of the existing building 1. The external fixed frame 2 and the internal fixed frame 3 are connected by tie rods (not marked in the figure), and the tie rods are set through the drilled hole. The tie rods are used to fasten the external fixed frame 2 and the internal fixed frame 3. The cooperation of the external fixed frame 2 and the internal fixed frame 3 can fix the base of the existing building 1. During the expansion process, the possibility of cracking of the existing building 1 can be reduced. S2: Initial excavation is carried out on the ground 4 located within the existing building 1, and the excavation direction is set along its vertical direction. When a certain depth is reached, a trench 5 is formed. It should be noted that the inner wall of the trench 5 is set coplanarly with the inner wall of the inner fixed frame 3, thereby expanding the original space within the existing building 1.

[0018] S3: Several sliding mounting parts 6 are fixed at equal intervals on the inner fixed frame 4. Each baffle plate 7 has a vertical groove 703 on its back, and the sliding mounting parts 6 are slidably installed inside the groove. It should be noted that: limiting protrusions 701 and limiting grooves 702 are fixed on both sides of the baffle plate 7, and two baffle plates 7 are connected by limiting protrusions 701 and limiting grooves 702. The cooperation of limiting protrusions 701 and limiting grooves 702 serves to connect adjacent baffle plates 7, reduce the gap between two baffle plates 7, and prevent some soil from flowing between the two baffle plates 7. It should also be noted that: three adjacent baffle plates 7 are connected to the same reinforcing rod 10 by fixing bolts (not shown in the figure). The setting of the reinforcing rod 10 serves to reinforce the baffle plates 3, reducing the phenomenon of loosening or unevenness of adjacent baffle plates 7.

[0019] S4: When the trench 5 after the initial expansion is excavated for the second time, the blocking plate 7 can fall freely downward according to the depth of the trench 5, so as to ensure that the blocking plate 7 can completely block the inner side wall of the trench 5, so as to prevent the soil on the side wall of the trench 5 from falling or loosening, ensuring the stability of the foundation of the existing building 1 and reducing the occurrence of collapse.

[0020] S5: When the space inside the existing building 1 is expanded downward to a specified depth, an inner casting formwork 8 is built inside the trench 5, and the inner casting formwork 8 and several baffles 7 form a casting chamber 9, and the top of the casting chamber 9 is open. Through the setting of the casting chamber 9, concrete can be poured. If the concrete is completely solidified, it can form the wall of the trench 5.

[0021] It should be noted that multiple support frames 11 are fixed at equal intervals on the outer wall of the inner casting formwork 8, and the bottom end of the support frame 11 abuts against the inner bottom wall of the trench 5. The support frame 11, the ground of the trench 5 and the inner casting formwork 8 form a triangular structure, which supports the inner casting formwork 8 and prevents the inner casting formwork 8 from collapsing or tilting during use.

[0022] It should be noted that several support rods 11 are fixed between the inner casting formwork 8 and the blocking plate 7. The support rods 11 serve to support the inner casting formwork 8 and the blocking plate 7. The cooperation between the inner casting formwork 8 and the blocking plate 7 further supports the blocking plate 7.

[0023] S6: When pouring concrete into the interior of the pouring chamber 9, the concrete level should be flush with the top surface of the baffle plate 7 to prevent the concrete from overflowing. It should be noted that the concrete should be poured in multiple stages, and after each pour, a vibrator should be used to compact the concrete to ensure that the concrete is densely packed.

[0024] S7: After the poured concrete has completely solidified, the inner pouring formwork 8 is dismantled, and the poured concrete solidifies into a wall surface.

Claims

1. A method for vertical expansion of underground space in an existing building, characterized in that: Includes the following steps: S1: An external fixed frame (2) and an internal fixed frame (3) are built on the outer wall and inner wall of the existing building (1), respectively. The external fixed frame (2) and the internal fixed frame (3) are connected by several tie rods and fixed to the root of the existing building (1). S2: A trench (5) is initially excavated in the interior of the existing building (1) along its vertical direction, and multiple inner walls of the trench (5) are set coplanar with the inner walls of the inner fixed frame (3) to expand the interior space of the existing building (1). S3: Fix several sliding mounting parts (6) at equal intervals on the inner fixed frame (3), and slide the baffle plate (7) on the several sliding mounting parts (6); the adjacent baffle plates (7) fit together, and the baffle plate (7) fits together with the inner wall of the trench (5); to prevent the soil on the inner wall of the trench (5) from loosening or / and falling off. S4: The initial expansion trench (5) is excavated downwards a second time; the blocking plate (7) can fall freely downwards according to the depth of the trench (5) to ensure that the blocking plate (7) can completely block the inner wall of the trench (5). S5: When the space inside the existing building (1) is expanded downward to the specified depth, an inner casting template (8) is built inside the excavation (5) so that the inner casting template (8) and several baffles (7) form a casting chamber (9) with an "open" top. S6: Pour concrete inside the casting chamber (9) so that the concrete level is flush with the top surface of the baffle plate (7); S7: After the poured concrete has completely solidified, it forms the wall of the expanded space and the internal building formwork (8) is dismantled.

2. The method for vertical expansion of underground space in an existing building according to claim 1, characterized in that: In step S1: Before installing the tie rod, holes are pre-drilled in the existing building (1) so that the outer fixed frame (2) and the inner fixed frame (3) can be connected by the tie rod.

3. The method for vertical expansion of underground space in an existing building according to claim 1, characterized in that: After step S3, the three adjacent baffles (7) are mounted with the same reinforcing rod (10) by fixing bolts to reinforce the baffles (3) and reduce the unevenness between adjacent baffles (7).

4. A method for vertical expansion of underground space in an existing building according to claim 1 or 2, characterized in that: In step S3: When two adjacent baffles (7) are installed, the two baffles (7) are connected by a limiting protrusion (701) and a limiting groove (702) to enhance the sealing between the two baffles (7).

5. A method for vertical expansion of underground space in an existing building according to claim 1, characterized in that: In step S5, multiple support frames (11) are fixed at equal intervals on the outer side wall of the inner casting template (8), and the bottom end of the support frame (11) abuts against the inner bottom wall of the trench (5) to support the inner casting template (8) and prevent the inner casting template (8) from tilting or collapsing during the casting process.

6. The method for vertical expansion of underground space in an existing building according to claim 4, characterized in that: In step S5: Several support rods (12) are fixed at equal intervals between the blocking plate (7) and the inner casting template (8). The side plate (7) is supported again by the support rods (12) to prevent the side plate (7) from tilting.

7. The method for vertical expansion of underground space in an existing building according to claim 1, characterized in that: In step S6: When pouring concrete into the pouring chamber (9), it is done in multiple pours. After each pour, the concrete is vibrated with a vibrator to make the concrete filling dense.

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