A vibration isolation raft foundation, a construction mold and a construction method

Abstract

The present application relates to a kind of vibration isolation raft foundation, construction mould and construction method;The vibration isolation raft foundation includes upper raft structure, lower raft structure, connecting structure, vibration isolation structure being arranged between upper raft structure and lower raft structure and being arranged between lower raft structure and connecting structure;Mounting slot for installing the connecting structure is provided in the lower raft structure;The lower end of the connecting structure is arranged in the mounting slot, and the upper end is integrally connected with the upper raft structure;The vibration isolation structure is arranged between the connecting structure and the side wall and the bottom of the mounting slot.The vibration isolation raft foundation of the present application can connect upper raft structure and lower raft structure, thereby preventing the risk of upper building from overturning under horizontal vibration, improving the anti-overturning ability;Meanwhile, on this basis, the vibration isolation raft foundation of the present application can also isolate the vertical vibration of environment.

Description

Technical Field

[0001] This invention relates to the field of building vibration isolation technology, specifically to a vibration isolation raft foundation, construction mold, and construction method. Background Technology

[0002] With the development of society, economy, and urban construction, the distance between subway stations and urban development buildings is decreasing. As a result, buildings will be affected by the environmental vibrations caused by the subway during operation. This is intolerable for buildings along subway lines with huge commercial value. Under the long-term repeated action of subway vibration, it may adversely affect the safety of building structures, especially the functionality of building structures, such as causing cracks in floor slabs or walls. Moreover, such vibration may also affect the comfort of people inside the building, causing potential adverse effects on residents' rest and life.

[0003] A raft foundation, also known as a mat foundation or slab foundation, connects all independent column footings or strip footings with connecting beams, and then pours a cast-in-place base slab. It consists of a base slab, beams, and other integral components. When a building bears a large load and the soil bearing capacity is weak, a concrete base slab is often used to bear the building load, forming a raft foundation. It has good integrity and can effectively resist uneven soil settlement. Raft foundations are divided into flat raft foundations and beam-slab raft foundations. Flat raft foundations support locally thickened raft slabs; beam-slab raft foundations support both flat-top and flat-bottom forms with ribbed beams. Generally speaking, raft foundations are used when the soil bearing capacity is uneven or the soil is weak. Flat raft foundations are widely used in high-rise buildings due to their simple construction.

[0004] For raft foundation structures located near subway buildings, it's necessary to consider the vibrations generated by running rail vehicles. One solution is to lay vibration isolation pads within the raft foundation. Specifically, during raft foundation construction, a lower foundation layer is first poured in the excavation pit. Then, vibration isolation pads are laid on the lower foundation, and an upper foundation layer is poured on top of the pads. The main building structure sits atop the upper foundation. In this way, the vibrations generated by running rail vehicles are blocked by the vibration isolation pads, protecting the main building structure from impact. These vibration isolation pads are typically made of rubber or polyurethane.

[0005] However, in existing raft foundation buildings, the superstructure is installed on the upper raft structure. In order to achieve a good vibration reduction effect, vibration isolation pads are set between the upper and lower raft structures. Although the vibration isolation pads can isolate the vertical vibration of the environment, the connection strength between the upper and lower raft structures is weak because they are separated by the vibration isolation pads. The superstructure has poor anti-overturning ability and is at risk of overturning under the action of horizontal vibration or typhoons. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a vibration-isolated raft foundation. The vibration-isolated raft foundation can connect the upper raft structure and the lower raft structure to improve the anti-overturning ability. At the same time, the vibration-isolated raft foundation can also isolate the vertical vibration of the environment.

[0007] The second objective of this invention is to provide a construction mold for vibration-isolated raft foundations.

[0008] The third objective of this invention is to provide a construction method for vibration-isolated raft foundations.

[0009] The technical solution of this invention to solve the problems of the prior art is:

[0010] A vibration-damping raft foundation includes an upper raft structure, a lower raft structure, a connecting structure for connecting the upper and lower raft structures, and vibration-damping structures disposed between the upper and lower raft structures and between the lower raft structure and the connecting structure. The lower raft structure has a mounting groove for installing the connecting structure. The lower end of the connecting structure is disposed within the mounting groove, and its upper end is integrally connected to the upper raft structure. The vibration-damping structures are provided at the contact points between the connecting structure and the sidewalls and bottom of the mounting groove.

[0011] Preferably, the vibration isolation structure is a vibration isolation pad; the cross-section of the mounting groove is an inverted T-shaped structure that is wider at the bottom and narrower at the top.

[0012] Preferably, the connecting structure is a connecting column or a connecting beam. The reinforcing bars of the connecting column or beam are fixed within the space between the connecting column or beam and the vibration isolation pad by pouring concrete in the mounting groove. The reinforcing bars of the connecting column or beam are connected to the reinforcing bars in the upper raft foundation structure and are integrated by the poured concrete. That is, the connecting structure between the upper and lower raft foundation structures can be set up with multiple connecting columns, each forming an anti-overturning stress point, or it can be set up with a connecting beam. This connecting beam can be a beam that wraps around the raft foundation, with the entire connecting beam becoming an anti-overturning stress point, resulting in better overturning resistance.

[0013] Preferably, the lower raft structure has upwardly extending flanges around its perimeter, and vibration isolation pads are also provided between the flanges and the edges of the upper raft structure.

[0014] A construction mold for casting an installation groove in a vibration-damping raft foundation includes support rods, a first template mounted on the support rods, and second templates mounted on both sides of the first template. The support rods are located in the lower raft structure at the position where the installation groove needs to be formed. Multiple support rods are arranged along the extension direction of the installation groove. The support rods extend vertically upwards. The first template has mounting holes that mate with each of the multiple support rods. The support rods have support steps for supporting the first template. The first template is fitted onto the support rod through the mounting holes and supported by the support steps. The second templates are connected to the first template via a detachable connection structure. The outer surfaces of the two second templates and the bottom surfaces of the first template and the two second templates are combined to form the outline of the installation groove.

[0015] Preferably, a suspension structure is provided between the first template and the second template. The suspension structure includes a suspension block provided on the upper part of the first template and a suspension groove provided on the upper part of the second template. When the second template is installed on the first template, the suspension block on the second template cooperates with the suspension groove on the first template.

[0016] Preferably, the first template is in multiple sets, with multiple sets of first templates connected end to end along the length of the mounting groove, and connected by a connecting plate. The first template has a connecting post in the middle that cooperates with the connecting plate. Correspondingly, the second template is also in multiple sets, with multiple sets of second templates corresponding one-to-one with multiple sets of first templates, and each set consisting of two templates.

[0017] Preferably, the detachable connection structure includes a positioning block disposed on the second template and a positioning plate for connecting the positioning blocks on both sides of the second template. The positioning block and the support rod are both provided with connection holes at their tops. By passing the positioning plate through the connection holes in the positioning blocks on both sides of the second template and the top of the support rod, the second templates on both sides can be installed on the first template.

[0018] Preferably, a cantilever is provided between the first template and the bracket. The cantilever is in multiple sets, and the multiple sets of cantilever are arranged at equal intervals along the length direction of the mounting groove. The horizontal end of each set of cantilever is connected to the top of the support rod, and the vertical end is inserted into the connecting groove on the bracket.

[0019] Preferably, the outer side of the second template is provided with a groove, the opening of the groove is outward, and the upper and lower side walls of the groove are respectively provided with draft slopes that are inclined upward or inclined downward.

[0020] A construction method for a construction mold for a vibration-isolated raft foundation includes the following steps:

[0021] S1. Excavation of the foundation pit: Install support rods on the surface of the excavated foundation pit. The support rods are located at the positions where installation grooves need to be formed. Multiple sets of support rods are arranged along the extension direction of the installation grooves. After the support rods are installed, pour concrete on the surface of the foundation pit to form a concrete cushion layer.

[0022] S2. After the concrete foundation layer to be poured has dried, a lower raft slab structure is constructed on the surface of the foundation pit; wherein, the construction steps of the lower raft slab structure are as follows:

[0023] S21. Construct a reinforced concrete structure for the lower raft foundation on the surface of the foundation pit;

[0024] S22. Install two second templates on both sides of the first template via a detachable connection structure;

[0025] S23. Install the assembled first template and second template on the support rod, so that the mounting hole at the lower end of the first template fits onto the support rod and is supported by the support step on the support rod;

[0026] S24. Pour concrete into the foundation pit until the concrete reaches the preset height;

[0027] S25. After the concrete foundation to be poured has dried, the first formwork and the second formwork are removed. The removal sequence is as follows: first, the first formwork is removed through the detachable connection structure, then the second formwork on both sides is moved toward the middle one after another, and then the two second formworks are removed one by one to complete the construction of the lower raft structure and the installation groove provided in the lower raft structure.

[0028] S3. A vibration isolation structure is laid on the surface of the lower raft structure, wherein the surface of the lower raft structure includes the end face of the lower raft structure in contact with the upper raft structure, as well as the inner side and bottom surface of the mounting groove in the lower raft structure.

[0029] S4. A steel reinforcement structure for the connecting structure is built in the installation groove. Then, a steel reinforcement structure for the upper raft structure is built on the surface of the lower raft structure. Concrete is then poured. While constructing the upper raft structure, the upper raft structure is connected to the upper part of the connecting structure to form a whole. The bottom of the connecting structure is connected to the lower raft structure through a vibration isolation structure.

[0030] S5. Construct the superstructure on the basis of the upper raft structure.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] (1) The vibration isolation raft foundation of the present invention connects the upper raft structure and the lower raft structure through a connecting structure. The connecting structure can be used to resist horizontal vibration in the environment, thereby preventing the risk of the upper building overturning under horizontal vibration.

[0033] (2) The vibration isolation raft foundation of the present invention can prevent environmental vibration from being transmitted to the superstructure through the connecting structure or the upper raft structure by setting a vibration isolation structure between the upper raft structure and the lower raft structure, and between the lower raft structure and the connecting structure. This is equivalent to cutting off the propagation path between the connecting structure and the lower raft structure and between the lower raft structure and the upper raft structure by the vibration isolation structure, thereby eliminating the adverse effects of environmental vibration on the superstructure. Attached Figure Description

[0034] Figures 1-2 These are schematic diagrams of the construction mold used for pouring the installation groove in the vibration isolation raft foundation of the present invention from two different perspectives.

[0035] Figure 3 This is a schematic diagram of a detachable connection structure.

[0036] Figure 4 This is a schematic diagram of the cantilever structure.

[0037] Figure 5 This is a side view of the construction mold for the vibration isolation raft foundation of the present invention.

[0038] Figure 6 This is a three-dimensional view of the lower raft structure.

[0039] Figure 7 This is a cross-sectional view of the lower raft structure.

[0040] Figure 8 This is a cross-sectional view of the lower raft structure and vibration isolation structure.

[0041] Figure 9 This is a three-dimensional view of the lower raft structure, vibration isolation structure, and connecting structure.

[0042] Figure 10 This is a sectional view of the lower raft structure, vibration isolation structure, and connecting structure.

[0043] Figure 11 This is a cross-sectional view of the vibration isolation raft foundation of the present invention. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0045] Example 1

[0046] See Figures 1-11 The vibration isolation raft foundation of the present invention includes an upper raft structure 16, a lower raft structure 1, a connecting structure 2 disposed in the lower raft structure 1, and vibration isolation structures 3 disposed between the lower raft structure 1 and the connecting structure 2 and between the lower raft structure 1 and the upper raft structure 16. The lower raft structure 1 is provided with an mounting groove for installing the connecting structure 2. The lower end of the connecting structure 2 is disposed in the mounting groove, and the upper end is connected to the upper raft structure 16 as a whole. The vibration isolation structures 3 are disposed between the connecting structure 2 and the sidewalls and bottom of the mounting groove.

[0047] The purpose is to connect the upper raft structure 16 and the lower raft structure 1 via the connecting structure 2. The connecting structure 2 can resist horizontal vibrations from the environment, thereby preventing the risk of the superstructure overturning under horizontal vibrations. Furthermore, by providing vibration isolation structures 3 between the upper raft structure 16 and the lower raft structure 1, and between the lower raft structure 1 and the connecting structure 2, environmental vibrations can be prevented from being transmitted to the superstructure through the connecting structure 2 or the upper raft structure 16. In other words, the vibration isolation structure 3 cuts off the propagation path between the connecting structure 2 and the lower raft structure 1, and between the lower raft structure 1 and the upper raft structure 16, thereby eliminating the adverse effects of environmental vibrations on the superstructure.

[0048] In this embodiment, the vibration isolation structure 3 is a vibration isolation pad; the installation groove has an inverted T-shaped cross-section that is wider at the bottom and narrower at the top; the connection structure 2 is a connecting column or a connecting beam; the reinforcing bars of the connecting column or beam are fixed in the space between the connecting column or beam and the vibration isolation pad by pouring concrete in the installation groove. The reinforcing bars of the connecting column or beam are connected to the reinforcing bars in the upper raft foundation 16 and are connected as a whole by the poured concrete. That is, the connection structure between the upper raft foundation 16 and the lower raft foundation 1 can be set up with multiple connecting columns, each connecting column constituting an anti-overturning stress point, or it can be set up with a connecting beam. The connecting beam can be a beam that wraps around the raft foundation, and the entire connecting beam becomes an anti-overturning stress point, which has better overturning resistance.

[0049] See Figures 1-11 The lower raft structure 1 has upwardly extending flanges 13 around its perimeter, and vibration isolation pads are also provided between the flanges 13 and the edge of the upper raft structure 16.

[0050] Example 2

[0051] See Figures 1-11The construction mold for casting the installation groove in the vibration isolation raft foundation of the present invention includes a support 7, a first template 5 set on the support 7, and second templates 6 set on both sides of the first template 5. A support rod 4 is provided inside the lower raft structure 1. The support rod 4 is located at the position in the lower raft structure 1 where the installation groove needs to be formed. Multiple sets of support rods 4 are arranged along the extension direction of the installation groove. The support rod 4 extends vertically upward. The first template 5 has mounting holes that mate with each set of support rods 4. The support rod 4 has a support step for supporting the first template 5. The first template 5 is fitted onto the support rod 4 through the mounting holes and supported by the support step. The second template 6 is connected to the first template 5 via a detachable connection structure. The outer surfaces of the two second templates 6 and the bottom surfaces of the first template 5 and the two second templates 6 are combined to form the outline of the installation groove.

[0052] In this embodiment, the outer side of the second template 6 is provided with a groove, the opening of the groove faces outward, and the upper and lower side walls of the groove are respectively provided with draft slopes 9 that are inclined upward or inclined downward.

[0053] See Figures 1-11 A suspension structure is provided between the first template 5 and the second template 6. The suspension structure includes a suspension block 14 on the upper part of the first template 5 and a suspension groove 15 on the upper part of the second template 6. When the second template 6 is installed on the first template 5, the suspension blocks 14 on both sides of the first template 5 cooperate with the suspension groove 15 on the second template 6 to ensure that the first template 5 and the second template 6 fit together. Before constructing the lower raft structure 1, the second template 6 is first installed on both sides of the first template 5, and the suspension blocks 14 on both sides of the first template 5 are respectively cooperated with the suspension groove 15 on the second template 6. Then, the first template 5 and the second template 6 are transferred as a whole to the support rod 4, so that the mounting hole below the first template 5 cooperates with the support rod 4 pre-set on the foundation pit. When the lower raft structure 1 is constructed, since the suspension structure is set above the first template 5 and the second template 6, the first template 5 can be removed upwards first, and then the second templates 6 on both sides can be moved towards the middle one after another. Then, the two second templates 6 are removed one by one, thereby completing the dismantling of the first template 5 and the second template 6.

[0054] In this embodiment, there are multiple sets of first templates 5, which are connected end to end along the length of the mounting groove and are connected by a connecting plate 12. The top of the support rod 4 passing through the first template 5 is connected to the connecting plate 12. Correspondingly, there are also multiple sets of second templates 6.

[0055] See Figures 1-11 The detachable connection structure consists of multiple sets, which are arranged sequentially along the length of the first template 5 or the second template 6. Each set of detachable connection structures includes a positioning block 11 on the second template 6 and a positioning plate 10 for connecting the positioning blocks 11 on both sides of the second template 6. The positioning blocks 11 and the support rod 4 are provided with connection holes at their tops. By passing the positioning plate 10 through the connection holes at the tops of the positioning blocks 11 on both sides of the second template 6 and the support rod 4 on the first template 5, the second templates 6 on both sides can be installed on the first template 5.

[0056] See Figures 1-11 A cantilever 8 is provided between the first template 5 and the support 7. Multiple sets of cantilever 8 are arranged equidistantly along the length of the support 7. The horizontal end of each cantilever 8 is connected to the top of the support rod 4, and the vertical end is inserted into a connecting groove on the support 7. By providing the cantilever 8, the first template 5 and the second template 6 can be suspended on the support 7 before concrete pouring. Simultaneously, the parallel arrangement of multiple sets of cantilever 8 can resist the lateral pressure of the concrete on the first template 5 and the second template 6 during concrete pouring, preventing them from shaking and ensuring the accuracy of the constructed installation groove. Furthermore, the connecting plate 12 ensures that the multiple sets of first and second templates do not misalign, further guaranteeing the accuracy of the constructed installation groove.

[0057] Example 3

[0058] See Figures 1-11 The construction method of the vibration isolation raft foundation of the present invention includes the following steps:

[0059] S1. Excavation of the foundation pit: Install support rods 4 on the surface of the excavated foundation pit. The support rods 4 are located at the positions where installation grooves need to be formed. Multiple sets of support rods 4 are arranged along the extension direction of the installation grooves. After the support rods 4 are installed, concrete is poured on the surface of the foundation pit to form a concrete cushion layer.

[0060] S2. After the concrete foundation layer to be poured has dried, a lower raft structure 1 is constructed on the surface of the foundation pit; wherein, the construction steps of the lower raft structure 1 are as follows:

[0061] S21. Construct a reinforced concrete structure for the lower raft foundation on the surface of the foundation pit;

[0062] S22. The second template 6 is installed on both sides of the first template 5 through a detachable connection structure. The specific installation process is as follows: the hanging groove 15 in the second template 6 on both sides is matched with the hanging block 14 on both sides of the first template 5, and then the positioning plate 10 is inserted into the positioning block 11 on the second template 6 on both sides and the connection hole in the top of the support rod on the first template 5, thereby completing the fixing of the second template 6 on both sides of the first template 5 on both sides.

[0063] S23. Install the installed first template 5 and second template 6 on the support rod 4, so that the mounting hole at the lower end of the first template 5 matches the support rod 4; at the same time, connect the first template 5 to the bracket 7 through the cantilever 8;

[0064] S24. Pour concrete into the foundation pit until the concrete reaches the preset height;

[0065] S25. After the concrete foundation to be poured has dried, remove the first formwork 5 and the second formwork 6, wherein the removal sequence is as follows:

[0066] (1) First separate the cantilever 8 and the connecting plate 12, and then remove the connecting plate 12;

[0067] (2) Remove the positioning plate 10 from the connection hole at the top of the positioning block 11 and the support rod 4;

[0068] (3) Take out the first template 5 upwards;

[0069] (4) Move the second template 6 on one side to the middle area of ​​the mounting groove to cause the draft angle 9 on the second template 6 on that side to come out, and then take out the second template 6 on that side upward; repeat the above operation on the other side of the second template 6; thereby construct the lower raft structure 1 and the mounting groove provided in the lower raft structure 1.

[0070] S3. A vibration isolation structure 3 is laid on the surface of the lower raft structure 1, wherein the surface of the lower raft structure 1 includes the end face of the lower raft structure 1 in contact with the upper raft structure 16, as well as the inner side and bottom surface of the mounting groove in the lower raft structure 1.

[0071] S4. Construct the steel reinforcement structure of the connecting structure 2 in the installation groove, and then construct the steel reinforcement structure of the upper raft structure 16 on the surface of the lower raft structure 1. Next, pour concrete. While constructing the upper raft structure 1, connect the upper raft structure 1 and the upper part of the connecting structure 2 into a whole. The bottom of the connecting structure 2 is connected to the lower raft structure 1 through the vibration isolation structure 3. The construction of the upper raft structure 16 also includes two steps: laying steel reinforcement and pouring concrete. The specific implementation can refer to the existing methods.

[0072] S5. Construct the superstructure on the basis of the upper raft structure 16.

[0073] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A construction mold, characterized in that, Used for casting installation grooves in vibration-isolated raft foundations, wherein, The vibration-isolated raft foundation includes an upper raft structure, a lower raft structure, a connecting structure for connecting the upper and lower raft structures, and vibration-isolated structures disposed between the upper and lower raft structures and between the lower raft structure and the connecting structure. The lower raft structure has a mounting groove for installing the connecting structure. The lower end of the connecting structure is disposed within the mounting groove, and the upper end is integrally connected to the upper raft structure. Vibration-isolated structures are provided between the connecting structure and the sidewalls and bottom of the mounting groove. The construction mold includes support rods, a first template mounted on the support rods, and second templates mounted on both sides of the first template. The support rods are located in the lower raft structure at positions where mounting grooves need to be formed. Multiple support rods are arranged along the extension direction of the mounting grooves. The support rods extend vertically upwards. The first template has mounting holes that mate with each of the multiple support rods. The support rods have support steps for supporting the first template. The first template is fitted onto the support rods through the mounting holes and supported by the support steps. The second templates are connected to the first template via a detachable connection structure. The outer surfaces of the two second templates and the bottom surfaces of the first template and the two second templates are combined to form the outline of the mounting groove.

2. The construction mold according to claim 1, characterized in that, The vibration isolation structure is a vibration isolation pad; the cross-section of the mounting groove is an inverted T-shaped structure that is wider at the bottom and narrower at the top.

3. The construction mold according to claim 2, characterized in that, The connection structure is a connecting column or a connecting beam; the steel bars of the connecting column or connecting beam are fixed in the space between the connecting column or connecting beam and the vibration isolation pad by pouring concrete in the mounting groove. The steel bars of the connecting column or connecting beam are connected to the steel bars in the upper raft structure and are connected as a whole by the poured concrete.

4. The construction mold according to claim 3, characterized in that, The lower raft structure has upwardly extending retaining edges around its perimeter, and vibration isolation pads are also provided between the retaining edges and the edges of the upper raft structure.

5. The construction mold according to claim 4, characterized in that, A suspension structure is provided between the first template and the second template. The suspension structure includes a suspension block provided on the upper part of the first template and a suspension groove provided on the upper part of the second template. When the second template is installed on the first template, the suspension block on the first template cooperates with the suspension groove on the second template.

6. The construction mold according to claim 5, characterized in that, The first template consists of multiple sets, which are connected end to end along the length of the mounting groove and are connected by a connecting plate. The support rod passes vertically upward through the first template and connects to the connecting plate. Correspondingly, the second template also consists of multiple sets, which correspond one-to-one with the first template, with two templates in each set.

7. The construction mold according to claim 6, characterized in that, The detachable connection structure includes a positioning block disposed on the second template and a positioning plate for connecting the positioning blocks on both sides of the second template. The positioning block and the support rod are provided with connection holes at their tops. By passing the positioning plate through the connection holes at the tops of the positioning blocks in the second templates on both sides and the support rod, the second templates on both sides can be installed on the first template.

8. The construction mold according to claim 7, characterized in that, A cantilever is provided between the first template and the bracket. The cantilever consists of multiple sets, which are arranged at equal intervals along the length of the mounting groove. The horizontal end of each set of cantilever is connected to the top of the support rod, and the vertical end is inserted into the connecting groove on the bracket.

9. A construction method for a vibration-isolated raft foundation, characterized in that, The construction mold described in claim 8 includes the following steps: S1. Excavation of the foundation pit: Install support rods on the surface of the excavated foundation pit. The support rods are located at the positions where installation grooves need to be formed. Multiple sets of support rods are arranged along the extension direction of the installation grooves. After the support rods are installed, pour concrete on the surface of the foundation pit to form a concrete cushion layer. S2. After the concrete foundation layer to be poured has dried, a lower raft slab structure is constructed on the surface of the foundation pit; wherein, the construction steps of the lower raft slab structure are as follows: S21. Construct a reinforced concrete structure for the lower raft foundation on the surface of the foundation pit; S22. Install two second templates on both sides of the first template via a detachable connection structure; S23. Install the assembled first template and second template on the support rod, so that the mounting hole at the lower end of the first template fits onto the support rod and is supported by the support step on the support rod; S24. Pour concrete into the foundation pit until the concrete reaches the preset height; S25. After the concrete foundation to be poured has dried, the first formwork and the second formwork are removed. The removal sequence is as follows: first, the first formwork is removed through the detachable connection structure, then the second formwork on both sides is moved toward the middle one after another, and then the two second formworks are removed one by one to complete the construction of the lower raft structure and the installation groove in the lower raft structure. S3. A vibration isolation structure is laid on the surface of the lower raft structure, wherein the surface of the lower raft structure includes the end face of the lower raft structure in contact with the upper raft structure, as well as the inner side and bottom surface of the mounting groove in the lower raft structure. S4. A steel reinforcement structure for the connecting structure is built in the installation groove. Then, a steel reinforcement structure for the upper raft structure is built on the surface of the lower raft structure. Then, concrete is poured. While constructing the upper raft structure, the upper raft structure is connected to the upper part of the connecting structure to form a whole. The bottom of the connecting structure is connected to the lower raft structure through a vibration isolation structure. S5. Construct the superstructure on the basis of the upper raft structure.

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