A combined pile column system for development of underground space of existing building

Abstract

This application relates to the field of urban renewal and underground space development technology, and discloses a composite pile system for underground space development of existing buildings, including prefabricated modules and cast-in-place modules, with connecting components between the prefabricated modules and cast-in-place modules. This composite pile system for underground space development of existing buildings achieves rapid alignment and installation by precisely fitting a first flange welded to the top of the prefabricated pile body in the prefabricated module with a first connecting hole at the bottom of the connecting platform of the connecting component. A first high-strength bolt passes through the first connecting hole and extends into the filling hole, and is solidified by grouting with a first concrete filler, enhancing shear resistance. Furthermore, the four prefabricated pile bodies effectively disperse the stress transmitted from the top, improving stability. The second connecting plate at the bottom of the cast-in-place concrete column of the cast-in-place module is aligned and locked with the second high-strength bolt of the connecting component through a second connecting hole, simplifying high-altitude splicing.

Description

Technical Field

[0001] This application relates to the field of urban renewal and renovation combined with underground space development technology, specifically a combined pile system for underground space development of existing buildings. Background Technology

[0002] In recent years, my country's economy has developed rapidly and urban construction has been in full swing. As a non-renewable resource, underground space has received increasing attention, and its development and utilization have become indispensable in urban construction.

[0003] An existing patent (publication number: CN216948398U) discloses a combined pile-column system for underground spaces of existing buildings. The technical solution is as follows: the underground space to be developed is located beneath the existing building, which has a shallow foundation. This shallow foundation is widened and reinforced to form a pile cap foundation. Anchored static pressure piles are installed under the pile cap foundation and connected to it as a whole. Cast-in-place piles are arranged within the underground space beneath the existing building. A foundation pit retaining structure is installed around the perimeter of the basement on the exterior of the existing building. The top of the basement roof slab is connected to the pile cap foundation, and the bottom of the basement roof slab is connected to the cast-in-place piles. The perimeter of the basement roof slab is connected to the foundation pit retaining structure. Through this technical solution, effective support and safety protection for the existing building are achieved throughout the entire basement construction process. The development of the underground space helps to improve the functional quality of existing buildings and revitalize urban historical districts.

[0004] While the devices in the aforementioned comparative documents can effectively support existing buildings, their connection methods lack flexibility, and the construction cycle is long, making it difficult to meet the rapid construction needs of complex sites. To address these issues, a combined pile-column system for the development of underground space in existing buildings is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a combined pile-column system for the development of underground space in existing buildings, which solves the problems of insufficient pile foundation bearing capacity, large construction disturbance, and inflexible connection in existing technologies.

[0006] To achieve the above objectives, this application provides the following technical solution: a combined pile-column system for the development of underground space in existing buildings, comprising prefabricated modules and cast-in-place modules, wherein a connecting component is provided between the prefabricated modules and the cast-in-place modules, the connecting component comprising a connecting base, the bottom surface of the connecting base having four first connecting holes, the inner wall of each first connecting hole being fixedly connected to a first connecting plate, the edge of each first connecting plate having a first connecting hole, the upper surface of the connecting base having four filling holes, the center of the upper surface of the connecting base having a second connecting hole, the inner bottom wall of the second connecting hole being welded to a second flange, the edge of the second flange being welded to four second high-strength bolts, the outer surface of each second high-strength bolt being fitted with a second high-strength nut, and the upper surface of the second flange being fixedly connected to uniformly distributed shear protrusions.

[0007] Through the above scheme, the first connecting plate is fixed in the four first connecting holes at the bottom of the connecting pier. The first connecting hole on its edge can be quickly locked with the precast module. The second flange is welded in the four filling holes on the upper surface of the connecting pier and the central second connecting hole. The second high-strength bolt and the second high-strength nut on its edge can be quickly connected between the connecting component and the cast-in-place module. The shear protrusions evenly distributed on the surface of the second flange cooperate with the cast-in-place module to form a multi-path force transmission and shear resistance mechanism, which significantly improves construction efficiency, load-bearing stability and seismic redundancy.

[0008] Furthermore, the prefabricated module includes four prefabricated pile bodies, and a first flange is welded to the top of each prefabricated pile body. The size of the first flange is adapted to the size of the first connecting hole.

[0009] With the above solution, the first flange at the top of the precast pile body and the first connecting hole at the bottom of the connecting pile cap are precisely matched in size, ensuring that the precast module and the connecting components can be quickly aligned and installed, reducing on-site adjustment procedures and improving construction efficiency.

[0010] Furthermore, four first high-strength bolts are fixedly connected to the upper surface of each first flange, and a first high-strength nut is installed on the top of each first high-strength bolt.

[0011] Through the above scheme, the first high-strength bolt and the first high-strength nut form a rigid anchoring node. The precast pile body is locked to the connecting bearing platform by pre-tightening force to prevent the connection from loosening under vertical load and ensure stable load transmission.

[0012] Furthermore, the top of the first high-strength bolt penetrates through the first connecting hole and extends into the interior of the filling hole, and the interior of each filling hole is filled with a first concrete filler, while the interior of the second connecting hole is filled with a second concrete filler.

[0013] With the above scheme, the first high-strength bolt passes through the first connecting hole and extends into the filling hole. It is then filled with the first concrete filler, which not only enhances the bolt's corrosion resistance but also improves the overall shear strength through the bonding effect of the first concrete filler.

[0014] Furthermore, the cast-in-place module includes a cast-in-place concrete column, the bottom end of which is fixedly connected to a second connecting plate. The edge of the second connecting plate is provided with four second connecting holes, which are adapted to four second high-strength bolts.

[0015] With the above solution, the second connecting plate at the bottom of the cast-in-place concrete column is aligned and installed with the second high-strength bolt in the connecting component through the second connecting hole, realizing the rapid splicing of the cast-in-place module and the connecting component, and simplifying the difficulty of high-altitude operations.

[0016] Furthermore, the bottom surface of the second connecting plate is provided with evenly distributed shear grooves, which are adapted to the shear protrusions.

[0017] Through the above scheme, the shear groove and the shear protrusion on the second flange form a concave-convex interlocking structure, which generates a mechanical interlocking effect under horizontal load, significantly improving the shear resistance of the node and avoiding the risk of misalignment caused by earthquakes or lateral forces.

[0018] Furthermore, four second embedded blocks are pre-embedded inside the cast-in-place concrete column, and four first embedded blocks are pre-embedded on the upper surface of the connecting pier.

[0019] Through the above scheme, the second embedded block and the first embedded block are connected by welding with the reinforced column to form a continuous stress path, which enhances the coordinated deformation capacity of the above-ground and underground structures and reduces stress concentration caused by uneven load.

[0020] Furthermore, four reinforcing columns are provided above the connecting platform, and the two ends of the four reinforcing columns are respectively welded to the outer surfaces of the four second embedded blocks and the four first embedded blocks.

[0021] The above scheme strengthens the column as a rigid connector, transferring the load of the cast-in-place concrete column to the connecting pile cap through the embedded block, forming a multi-path force transmission mechanism, and improving the redundancy and seismic performance of the overall structure.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This composite pile-column system for developing underground spaces in existing buildings achieves rapid alignment and installation by precisely fitting the first flange welded to the top of the precast pile body in the precast module with the first connecting hole at the bottom of the connecting pier of the connecting component. The first high-strength bolt passes through the first connecting hole and extends into the filling hole, and is solidified by grouting with the first concrete filler to enhance shear resistance. In addition, the four precast pile bodies can effectively disperse the stress transmitted from the top, improving stability. The second connecting plate at the bottom of the cast-in-place concrete column of the cast-in-place module is aligned and locked with the second high-strength bolt of the connecting component through the second connecting hole, simplifying high-altitude splicing. The interlocking design of the shear groove and shear protrusion forms a mechanical interlock, improving the resistance to lateral displacement. The column is reinforced by welding between the second and first pre-embedded blocks to construct a multi-path force transmission mechanism. The synergistic effect of the above structures combines the advantages of efficient construction, high bearing capacity, shear strengthening, and seismic redundancy, which is significantly superior to the traditional anchor static pressure pile and cast-in-place pile combination system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall front view of the structure of this application;

[0025] Figure 2 This is a partial cross-sectional planar structural diagram of the structure of this application;

[0026] Figure 3 This is a schematic diagram of the precast pile body structure of the structure in this application;

[0027] Figure 4 This is a first partial top view of the structure of this application;

[0028] Figure 5 This is a schematic diagram of the first partial bottom view of the structure of this application;

[0029] Figure 6 This is a partial top view of the structure of this application;

[0030] Figure 7 This is a schematic diagram of the second part of the structure of this application from a bottom view.

[0031] In the picture:

[0032] 1. Precast module; 101. Precast pile body; 102. First flange; 103. First high-strength bolt; 104. First high-strength nut; 2. Connecting assembly; 201. Connecting platform; 202. First connecting hole; 203. First connecting plate; 204. First connecting hole; 205. Filling hole; 206. Second connecting hole; 207. Second flange; 208. Second high-strength bolt; 209. Second high-strength nut; 210. Shear protrusion; 211. First embedded block; 212. Reinforcing column; 213. First concrete filler; 214. Second concrete filler; 3. Cast-in-place module; 301. Cast-in-place concrete column; 302. Second connecting plate; 303. Second connecting hole; 304. Shear groove; 305. Second embedded block. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Please see Figure 1 , Figure 2 and Figure 5 This embodiment of a combined pile system for developing underground space of existing buildings includes a prefabricated module 1 and a cast-in-place module 3. A connecting component 2 is provided between the prefabricated module 1 and the cast-in-place module 3. The connecting component 2 includes a connecting platform 201. The bottom surface of the connecting platform 201 has four first connecting holes 202. The inner wall of each first connecting hole 202 is fixedly connected to a first connecting plate 203. The edge of each first connecting plate 203 has a first connecting hole 204. The upper surface of the connecting platform 201 has four filling holes 205.

[0035] Please see Figure 2 , Figure 4 and Figure 6 A second connecting hole 206 is provided at the center of the upper surface of the connecting base 201. A second flange 207 is welded to the inner bottom wall of the second connecting hole 206. Four second high-strength bolts 208 are welded to the edge of the second flange 207. A second high-strength nut 209 is installed on the outer surface of each second high-strength bolt 208. Shear protrusions 210 are fixedly connected to the upper surface of the second flange 207.

[0036] Please see Figure 1 , Figure 3 and Figure 4The prefabricated module 1 includes four prefabricated pile bodies 101. Each prefabricated pile body 101 has a first flange 102 welded to its top. The dimensions of the first flange 102 are matched with the dimensions of the first connecting hole 202. The first flange 102 at the top of the prefabricated pile body 101 and the first connecting hole 202 at the bottom of the connecting pile cap 201 form a precise dimensional match, ensuring rapid alignment and installation of the prefabricated module 1 and the connecting assembly 2, reducing on-site adjustment procedures, and improving construction efficiency. Four first high-strength bolts 103 are fixedly connected to the upper surface of each first flange 102. A first high-strength nut 104 is installed on the top of each first high-strength bolt 103. The high-strength bolt 103 and the first high-strength nut 104 form a rigid anchoring node. The pre-tightened precast pile body 101 is locked to the connecting pile cap 201 to prevent loosening under vertical load and ensure stable load transmission. The top of the first high-strength bolt 103 penetrates the first connecting hole 204 and extends into the interior of the filling hole 205. Each filling hole 205 is filled with the first concrete filler 213. After the first high-strength bolt 103 passes through the first connecting hole 204, it extends into the filling hole 205 and is grouted with the first concrete filler 213. This not only enhances the corrosion resistance of the bolt, but also improves the overall shear strength through the bonding effect of the first concrete filler 213.

[0037] Please see Figure 1 , Figure 6 and Figure 7 The cast-in-place module 3 includes a cast-in-place concrete column 301. A second connecting plate 302 is fixedly connected to the bottom of the cast-in-place concrete column 301. Four second connecting holes 303 are provided on the edge of the second connecting plate 302. The four second connecting holes 303 are adapted to four second high-strength bolts 208. The second connecting plate 302 at the bottom of the cast-in-place concrete column 301 is aligned and installed with the second high-strength bolts 208 in the connecting component 2 through the second connecting holes 303, realizing the rapid splicing of the cast-in-place module 3 and the connecting component 2, simplifying the difficulty of high-altitude operations. The bottom surface of the second connecting plate 302 is provided with evenly distributed shear grooves 304. The shear grooves 304 are adapted to the shear protrusions 210. The shear grooves 304 and the shear protrusions 210 on the second flange 207 form a concave-convex interlocking structure, which generates a mechanical interlocking effect under horizontal load, significantly improving the shear resistance of the node and avoiding the risk of misalignment caused by earthquakes or lateral forces. The interior of the second connecting hole 206 is filled with a second concrete filler 214.

[0038] Please see Figure 4 , Figure 5 and Figure 7Four second embedded blocks 305 are pre-embedded inside the cast-in-place concrete column 301, and four first embedded blocks 211 are pre-embedded on the upper surface of the connecting pile cap 201. The second embedded blocks 305 and the first embedded blocks 211 are welded together by reinforcing columns 212 to form a continuous force path, enhance the coordinated deformation capacity of the above-ground and underground structures, and reduce stress concentration caused by uneven load. Four reinforcing columns 212 are provided above the connecting pile cap 201. The two ends of the four reinforcing columns 212 are respectively welded to the outer surfaces of the four second embedded blocks 305 and the four first embedded blocks 211. The reinforcing columns 212 serve as rigid connectors, transferring the load of the cast-in-place concrete column 301 to the connecting pile cap 201 through the embedded blocks, forming a multi-path force transmission mechanism, and improving the redundancy and seismic performance of the overall structure.

[0039] In this embodiment, a composite pile-column system for developing underground space in existing buildings achieves rapid alignment and installation by precisely fitting the first flange 102 welded to the top of the precast pile body 101 in the precast module 1 with the first connecting hole 202 at the bottom of the connecting pile cap 201 in the connecting component 2. A first high-strength bolt 103 penetrates the first connecting hole 204 and extends into the filling hole 205, and is solidified by grouting with the first concrete filler 213, enhancing shear resistance. The bottom of the cast-in-place concrete column 301 in the cast-in-place module 3... The second connecting plate 302 is aligned and locked with the second high-strength bolt 208 of the connecting component 2 through the second connecting hole 303, simplifying high-altitude splicing. The interlocking design of the shear groove 304 and the shear protrusion 210 forms a mechanical interlock, improving the resistance to lateral displacement. The reinforcing column 212 is welded between the second embedded block 305 and the first embedded block 211 to construct a multi-path force transmission mechanism. The above structures work together to have the advantages of efficient construction, high bearing capacity, shear strengthening and seismic redundancy, which is significantly better than the traditional combination system of anchor static pressure piles and cast-in-place piles.

[0040] The working principle of the above embodiment is as follows: Through the synergistic effect of prefabricated module 1, connecting component 2, and cast-in-place module 3, efficient load-bearing capacity and safe construction are achieved in the development of underground space in existing buildings. During construction, the prefabricated pile body 101 is first statically implanted into the bearing layer below the existing building. The first flange 102 welded to its top is precisely aligned with the first connecting hole 202 at the bottom of the connecting pile cap 201. A first high-strength bolt 103 penetrates the first connecting hole 204 and extends into the filling hole 205. Subsequently, the first concrete filler 213 is poured in to solidify, forming a rigid node with shear reinforcement. The second flange 207 welded in the second connecting hole 206 at the center of the connecting pile cap 201 is aligned and locked with the second connecting plate 302 at the bottom of the cast-in-place concrete column 301 by a second high-strength bolt 208. Combined with shear force... The interlocking of the groove 304 and the shear protrusion 210 forms a mechanical shear barrier under horizontal loads. The second embedded block 305 pre-embedded in the cast-in-place module 3 and the first embedded block 211 of the connecting component 2 are welded together through the reinforcing column 212 to construct a continuous force transmission path between the above-ground and underground structures. This allows the vertical load to be transferred to the four precast pile bodies 101 through the cast-in-place concrete column 301, while also dispersing it to the deep foundation. During construction, the modular prefabrication and flange connection technology significantly reduces on-site adjustment procedures. The filling hole 205 and shear key design improve the corrosion resistance and lateral displacement resistance of the nodes. The multi-path force transmission mechanism and redundant connection structure effectively balance the load distribution and avoid stress concentration. Ultimately, this achieves stable support for the existing building throughout the deep foundation pit excavation process, taking into account efficient construction, high bearing capacity, and seismic performance.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combined pile column system for development of underground space of existing building, comprising prefabricated module (1) and cast-in-situ module (3), characterized in that: A connecting component (2) is provided between the precast module (1) and the cast-in-place module (3). The connecting component (2) includes a connecting base (201). The bottom surface of the connecting base (201) is provided with four first connecting holes (202). The inner wall of each first connecting hole (202) is fixedly connected with a first connecting plate (203). The edge of each first connecting plate (203) is provided with a first connecting hole (204). The upper surface of the connecting base (201) is provided with four filling holes (205). The center of the upper surface of the connecting base (201) is provided with a second connecting hole (206). The inner bottom wall of the second connecting hole (206) is welded with a second flange (207). The edge of the second flange (207) is welded with four second high-strength bolts (208). The outer surface of each second high-strength bolt (208) is provided with a second high-strength nut (209). The upper surface of the second flange (207) is fixedly connected with evenly distributed shear protrusions (210).

2. The combined pile column system for the development of underground space of existing buildings according to claim 1, characterized in that: The prefabricated module (1) includes four prefabricated pile bodies (101), and a first flange (102) is welded to the top of each prefabricated pile body (101). The size of the first flange (102) is adapted to the size of the first connecting hole (202).

3. The combined pile column system for the development of underground space of existing buildings according to claim 2, characterized in that: Each of the first flanges (102) has four first high-strength bolts (103) fixedly connected to its upper surface, and each of the first high-strength bolts (103) has a first high-strength nut (104) installed on its top.

4. The combined pile column system for underground space development of existing buildings according to claim 3, characterized in that: The top of the first high-strength bolt (103) passes through the first connecting hole (204) and extends into the interior of the filling hole (205), each of the filling holes (205) being filled with a first concrete filler (213), and the interior of the second connecting hole (206) being filled with a second concrete filler (214).

5. The combined pile column system for underground space development of existing buildings according to claim 1, characterized in that: The cast-in-place module (3) includes a cast-in-place concrete column (301), and a second connecting plate (302) is fixedly connected to the bottom end of the cast-in-place concrete column (301). Four second connecting holes (303) are provided at the edge of the second connecting plate (302), and the four second connecting holes (303) are adapted to four second high-strength bolts (208).

6. The combined pile column system for underground space development of existing buildings according to claim 5, characterized in that: The bottom surface of the second connecting plate (302) is provided with uniformly distributed shear grooves (304), which are adapted to the shear protrusions (210).

7. The combined pile column system for underground space development of existing buildings according to claim 5, characterized in that: The cast-in-place concrete column (301) has four second embedded blocks (305) embedded inside, and the upper surface of the connecting pile cap (201) has four first embedded blocks (211) embedded.

8. The combined pile column system for the development of underground space of existing buildings according to claim 7, characterized in that: Four reinforcing columns (212) are provided above the connecting platform (201), and the two ends of the four reinforcing columns (212) are respectively welded to the outer surfaces of the four second embedded blocks (305) and the four first embedded blocks (211).

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