A new assembly type integrated reconstruction system for old city bungalow

Abstract

This application relates to a novel prefabricated integrated renovation system for old town bungalows, including a prefabricated roof system and a prefabricated composite wall system. The prefabricated roof system has multiple sets of herringbone modular units, self-balancing tie rods, and tension cables. Each herringbone modular unit is formed by splicing two single-piece modules together. The self-balancing tie rods are connected between the two single-piece modules in each herringbone modular unit to balance the horizontal thrust of the prefabricated roof system. The tension cables are connected to the single-piece modules to prestress and tension the multiple sets of herringbone modular units connected in series. The prefabricated composite wall system has an inner lining wall, which is fixedly connected to the inner side of the existing wall of the bungalow, and the bottom end of the inner lining wall is fixedly connected to an additional ground beam on the inner side of the existing foundation. This application improves the function and performance of bungalows, enhances the living quality of old town dwellings, and has the advantages of maintaining and continuing the architectural style, high efficiency of prefabricated construction, convenient construction in small spaces, and coexistence of new and old structures.

Description

Technical Field

[0001] This application belongs to the field of prefabricated building technology, specifically relating to a new type of prefabricated integrated renovation system for old town bungalows. Background Technology

[0002] Against the backdrop of China's urban development shifting from incremental growth to slower, more sustainable development, urban renewal has become a crucial theme in both social and professional fields. As the most important carrier of a city's history, culture, and social value, the overall protection and organic renewal of the old city is of great significance to the planning and construction of various cities. Many Chinese cities possess old cities that have preserved their traditional features. Urban renewal work in old cities must both improve the living environment and protect historical and cultural heritage, integrating historical culture with modern life. As the most basic building block of the old city, the renovation and upgrading of traditional courtyard houses in the old city area is an important component of urban renewal, playing a vital role in enhancing the city's image, improving residents' living environment, and promoting socio-economic development.

[0003] Taking Beijing as an example: Within the old city of Beijing, traditional courtyard houses are clustered together, forming the foundation and traditional style of the old city. These courtyard houses are mainly located in historical and cultural districts or other areas of contiguous traditional courtyard houses. Existing buildings are further categorized as immovable cultural relics, historical buildings, traditional-style buildings, and other buildings. Most immovable cultural relics and historical buildings have undergone proper long-term protection and restoration in accordance with relevant laws, regulations, and standards. Large areas of courtyard houses within the old city belong to traditional-style buildings or other types of buildings. These courtyard houses, having evolved and developed over several eras, face problems such as disrepair, lack of sanitation facilities, unauthorized additions, and overcrowding, urgently requiring renovation and improvement.

[0004] According to surveys, some traditional courtyard houses in Beijing's old city have relatively good layouts and appearances. Restoring their traditional style and improving their living functions can be achieved through timber structure reinforcement and equipment repair. Other courtyard houses, due to irreversible structural changes or their original incompatibility with traditional styles, are being restored using steel structures to simulate timber structures. Both structural forms present different challenges in actual projects. Brick-timber structures are disadvantageous in terms of durability, fire resistance, limited span, moisture resistance, and thermal insulation; while steel structures are disadvantageous in terms of preserving traditional features, significant foundation disturbance, numerous cold bridges, and high weight. Furthermore, the narrow alleys and small courtyards in traditional courtyard house areas make it difficult for transport vehicles to access the sites, significantly impacting construction costs and schedules.

[0005] In addition, there are various methods for reinforcing the traditional masonry structures of old town courtyard houses, including demolition and reconstruction, adding ring beams and structural columns, and shotcrete wall reinforcement. Among these, demolition and reconstruction is significantly detrimental to the preservation of the historical appearance of the houses; adding ring beams and structural columns is inefficient and complex, and also damages the historical appearance; shotcrete wall reinforcement is a wet construction method, still requiring processes such as rebar binding and concrete curing, which is inefficient.

[0006] In summary, existing technologies are ill-suited for the renovation of single-story houses in confined construction spaces. Summary of the Invention

[0007] Based on the above analysis, the embodiments of the present invention aim to provide a new type of prefabricated integrated renovation system for old town bungalows, to solve at least one of the aforementioned problems existing in the prior art. The present invention can improve the function and performance of bungalows and enhance the quality of life in old towns while restoring their traditional appearance. It has the advantages of maintaining and continuing the original appearance, high efficiency of prefabricated construction, convenient construction in small spaces, and coexistence of new and old structures.

[0008] The objective of this invention is achieved as follows: A new type of prefabricated integrated renovation system for old town bungalows includes: The prefabricated roofing system comprises multiple sets of herringbone modular units, self-balancing tie rods, and tension cables. Each herringbone modular unit is formed by splicing two single-piece modules together. The self-balancing tie rods are connected between the two single-piece modules in each herringbone modular unit, arranged perpendicular to the ridge, and configured to balance the horizontal thrust of the prefabricated roofing system. The tension cables are connected to the single-piece modules, arranged parallel to the ridge, and configured to prestress the multiple sets of herringbone modular units connected in series. A prefabricated modular wall system is used to support the prefabricated roof system; the prefabricated modular wall system has an inner lining wall, which is fixedly connected to the inner side of the existing wall of the bungalow, and the bottom end of the inner lining wall is fixedly connected to an additional ground beam on the inner side of the existing foundation.

[0009] Furthermore, the inner lining wall includes an inner UHPC wall panel, and the inner UHPC wall panel is provided with an embedded insulation layer.

[0010] Furthermore, the inner lining wall is connected to the retained wall via through-wall tie bolts.

[0011] Furthermore, a threaded sleeve is pre-embedded in the inner lining wall, and a through hole is opened in the retaining wall. A steel sleeve is installed in the hole, and a through hole is provided at the bottom of the steel sleeve for bolts to pass through. The through-wall tie bolt passes through the steel sleeve, the through hole and connects with the threaded sleeve. The locking operation is achieved by screwing the nut in the steel sleeve.

[0012] Furthermore, each of the inner lining walls is composed of multiple lining wall units spliced ​​together in the horizontal direction, and the horizontal connection between two adjacent lining wall module units adopts a non-rigid splicing method.

[0013] Furthermore, the existing single-story house retains two gable walls and a rear eaves wall, with the inner lining wall installed on the inner sides of both the gable walls and the rear eaves wall; the front eaves wall includes a retained low wall and a prefabricated window wall facade system, which includes doors and windows, prefabricated beams and prefabricated columns. The prefabricated beams are horizontally arranged on the gable walls on both sides, and the top of the prefabricated columns is vertically connected to the prefabricated beams. The prefabricated columns are set on newly added independent foundations.

[0014] Furthermore, the single-piece module, the UHPC lining wall panel, the precast beam, and the precast column are all precast using ultra-high performance concrete incorporating fibers.

[0015] Furthermore, the incorporated fibers can be any one of steel fibers, glass fibers, or plastic fibers.

[0016] Furthermore, the single-piece module has a top connecting portion; in each group of herringbone module units, the top connecting portions of two single-piece modules are locked and fixed by bolts.

[0017] Furthermore, the single-piece module is provided with two lower connecting parts, which protrude from the inner surface of the single-piece module; the lower connecting part located on one side of the retained wall is supported on the top of the inner lining wall of the retained wall, and the lower connecting part on the other side is supported on the UHPC precast beam on the opposite side.

[0018] Furthermore, the top surface of the inner lining wall and the top surface of the retained wall are on the same horizontal plane, and the bottom surface of the lower connection on this side is a plane, which can slide and overlap the top surface of the inner lining wall; the top of the UHPC precast beam is provided with a limiting groove, and the bottom end of the lower connection on the other side is vertically inserted into the limiting groove, which is configured to limit the horizontal displacement of the lower connection on this side.

[0019] Furthermore, the lower connecting part is provided with a through hole for rods, the center line of which is perpendicular to the ridge, so that the self-balancing tie rod can pass through. After the self-balancing tie rod passes through the through holes of two single modules in each group of herringbone module units, the two ends of the self-balancing tie rod are fixed to the single modules using a locking nut and washer system.

[0020] Furthermore, the lower connecting part is also provided with a first cable through hole, the center line of which is parallel to the ridge, so that the tension cable can pass through; after the tension cable passes through the first cable through hole of multiple single modules on the same side of the multiple sets of herringbone module units, the two ends of the tension cable are locked by the cable end locking member, thereby realizing the locking and fixing of the multiple sets of herringbone module units along the direction parallel to the ridge.

[0021] Furthermore, the top end of the top connector is provided with a bolt hole, and the bottom end of the top connector is provided with a second cable through hole, the center line of which is parallel to the ridge, so that the tension cable can pass through.

[0022] Furthermore, the top end of the top connecting part protrudes upward, and after the two top connecting parts of each group of herringbone module units are joined together, a ridge is formed at the top. The top ends of multiple groups of herringbone module units connected in series form a ridge. The bottom end of the top connecting part protrudes downward and extends into the herringbone interior space.

[0023] Compared with existing technologies, the new prefabricated integrated renovation system for old town bungalows provided by this invention can achieve at least one of the following beneficial effects: 1. Unlike the traditional renovation model of old town courtyard houses, this invention takes into account the maintenance and continuation of the traditional style of historical buildings while renovating old town courtyard houses. The renovation process takes into account both quality improvement and the continuation of historical culture. The updated renovation method brings about a comprehensive improvement in durability, applicability, systematicness and prefabrication, which is a more efficient, high-quality and green renovation model.

[0024] 2. The roof system's base material is ultra-high performance concrete (UHPC), without additional reinforcement such as steel bars, facilitating processing and installation. The roof structure uses a standard herringbone layout, employing a modular segmentation strategy. The UHPC pouring thickness is thinner, limiting the overall weight of individual modules and ensuring smooth transportation, construction, and installation within confined spaces. The UHPC material strength (tensile and compressive strength) and component cross-sections meet the roof's load-bearing capacity calculation requirements, ensuring normal roof use and seismic safety. Furthermore, the splicing of multiple herringbone module units in the roof system utilizes a combination of prestressed tensioning and bolt fastening, a fully dry, assembly-line process. Through the prestressed cable tensioning method, combined with specialized structures such as steel strands and anchors, the prestressing force is rationally determined, ensuring the roof's overall integrity and combined load-bearing capacity after tensioning. The lower part of the roofing system is equipped with self-balancing tie rods to balance the horizontal thrust of the prefabricated roofing system and reduce the additional load on the lower wall. The self-balancing tie rods use steel tie rod sections and are connected to the pre-set lower connection parts on the single module. A low-stress, easy-to-implement manual tensioning scheme is adopted to control the construction difficulty and ensure the self-balancing effect of the horizontal thrust of the roofing system.

[0025] 3. By adding inner lining walls to the existing walls and effectively integrating the old and new walls with through-wall tie bolts, the vertical bearing capacity of the existing walls is significantly improved. The vertical load transmitted by the roof system is mainly borne by the newly added inner lining walls. Simultaneously, the combined wall system formed by the new inner lining walls and the existing walls shares the horizontal loads such as earthquakes and wind loads. The combined cross-section of the old and new walls meets seismic safety requirements, thus improving seismic performance. Furthermore, the foundation adopts a strategy of continuing the existing foundation to minimize disturbance, and a technical solution of adding ground beams for supplementary support is constructed on the existing foundation. The overall weight of the renovated building does not exceed the existing weight, and no additional foundation load is added, ensuring the foundation safety performance under the low-disturbance renovation strategy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram showing the separation of the prefabricated roof system and the prefabricated combined wall system in the new prefabricated integrated renovation system for old town bungalows provided by the present invention. Figure 2 This is a structural schematic diagram of the new prefabricated integrated renovation system for old town bungalows provided by the present invention; Figure 3 A partial structural schematic diagram of the new prefabricated integrated renovation system for old town bungalows provided by the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the prefabricated modular wall system provided by the present invention; Figure 5 A partial cross-sectional structural schematic diagram of the prefabricated modular wall system provided by the present invention; Figure 6 A schematic diagram of the structure of the inner lining wall unit provided by the present invention; Figure 7 A schematic diagram of a structure for setting an airtight membrane at the joint position of two adjacent wall lining units provided by the present invention; Figure 8 This is a schematic diagram of the construction process of the prefabricated modular wall system provided by the present invention; Figure 9 This is a structural schematic diagram of the prefabricated roofing system provided by the present invention; Figure 10 A schematic diagram of the first angle structure of a set of herringbone-shaped modular units provided by the present invention; Figure 11A schematic diagram of the second angle of a set of herringbone module units provided by the present invention; Figure 12 A schematic diagram of the connection structure of the two sets of herringbone module units provided by the present invention; Figure 13 A schematic diagram of the overlapping structure of single-piece modules of multiple sets of herringbone-shaped module units provided by the present invention; Figure 14 A schematic diagram of a structure for setting a first leak-proof measure at the joint of two adjacent single-piece modules provided by the present invention; Figure 15 A schematic diagram of a structure for setting a second leak-proof measure at the overlap of two adjacent single-piece modules provided by the present invention; Figure 16 A schematic diagram of the prefabricated roofing system provided by the present invention, with one side overlapping the top of the inner lining wall; Figure 17 This is a schematic diagram of the prefabricated roofing system provided by the present invention, which is inserted into the limiting groove at the top of the prefabricated beam on the other side.

[0028] Figure label: 1. Prefabricated roofing system; 11. Herringbone modular unit; 111. Single-piece module; 1111. Top connection; 1112. Lower connection; 1113. Baffle; 12. Tension cable; 13. Self-balancing tie rod; 14. Bolt; 15. Ridge cover plate; 16. Waterproof layer; 17. Rubber expansion waterstop strip; 18. Integrated waterproof and thermal insulation ceiling; 2. Prefabricated composite wall system; 21. Gable wall; 22. Front eaves wall; 221. Low wall; 23. Rear eaves wall; 24. Lining wall; 240. Lining wall unit; 241. Lining UHPC wall panel; 242. Embedded insulation layer; 243. Reinforcing rib; 244. Frame; 245. Threaded sleeve; 246. Airtight membrane; 247. Stirred reinforcement; 25. Precast beam; 26. Precast column; 27. Through hole; 271. Small pavilion mud brick; 28. Steel sleeve; 29. ​​Through-wall tie bolt; 3. Existing foundation; 4. Add a ground beam; 5. Construct a new independent foundation. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. It should be noted that, unless otherwise specified, the implementation methods and features in the implementation methods in this disclosure can be combined, separated, interchanged, and / or rearranged. 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.

[0030] In the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0031] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0032] Example 1 A specific embodiment of the present invention, such as Figures 1 to 3 As shown, a new type of prefabricated integrated renovation system for old town bungalows is disclosed, including a prefabricated roof system 1 and a prefabricated composite wall system 2. The prefabricated roof system can be detachably installed on the prefabricated composite wall system, and the prefabricated composite wall system 2 is used to support the prefabricated roof system 1.

[0033] like Figures 9 to 17As shown, the prefabricated roofing system 1 includes multiple sets of herringbone module units 11, tension cables 12, and self-balancing tie rods 13; wherein, each set of herringbone module units 11 is formed by splicing two single modules 111 together; the self-balancing tie rods 13 are connected between the two single modules 111 of each set of herringbone module units 11, arranged perpendicular to the ridge, and configured to balance the horizontal thrust of the prefabricated roofing system 1; the tension cables 12 are connected to the single modules 111, arranged parallel to the ridge, and configured to prestress the multiple sets of herringbone module units 11 connected in series.

[0034] like Figures 4 to 8 As shown, the prefabricated modular wall system 2 includes an inner lining wall 24, which is fixedly connected to the inner side of the existing wall of the bungalow, and the bottom end of the inner lining wall 24 is fixedly connected to the added ground beam 4 on the inner side of the existing foundation.

[0035] The walls supporting the prefabricated roof system 1 include a front eaves wall 22 and a rear eaves wall 23 arranged opposite to each other, and two gable walls 21 arranged opposite to each other.

[0036] The front eaves wall 22 includes the retained low wall and a prefabricated window wall facade system. This system can also be understood as part of the prefabricated modular wall system 2. The window wall facade of the front eaves wall 22 is constructed with reference to the traditional courtyard house shape, ensuring that the appearance of the window wall facade matches the traditional craftsmanship style after the renovation. The prefabricated window wall facade system includes doors and windows, prefabricated beams 25, and prefabricated columns 26. Aluminum alloy window sills are installed on the low wall 221, and the doors and windows are thermally broken aluminum alloy doors and windows. The prefabricated beams 25 and prefabricated columns 26 replace the original beam and column support structure. That is, prefabricated columns 26 and prefabricated beams 25 are installed in the positions of the original columns and beams. The prefabricated beams 25 are horizontally arranged above the gable walls 21 on both sides, and the top of the prefabricated columns 26 is vertically connected to the prefabricated beams 25. The prefabricated columns 26 are set on newly built independent foundations 5.

[0037] The existing single-story houses retain two gable walls 21, a rear eaves wall 23, and a front eaves wall 22. The gable walls 21 and the rear eaves wall 23 are equipped with inner lining walls 24 on their inner sides, while the low walls do not require inner lining walls 24.

[0038] In this embodiment, the inner lining wall 24 includes an inner UHPC wall panel 241 prefabricated from ultra-high performance concrete, and the inner UHPC wall panel 241 is provided with an embedded thermal insulation layer 242.

[0039] For the embedded insulation layer 242, either of the following two options can be used: The first option, the embedded insulation layer 242, involves a groove on the side of the UHPC wall panel 241 closest to the retained wall. Insulation material is filled into the groove on-site to form the embedded insulation layer 242. Optionally, the UHPC wall panel 241 has a U-shaped cross-section, with the opening of the U-shaped cross-section facing the retained wall. Optionally, the thickness of the UHPC wall panel 241 is 20~40mm. In other words, the UHPC wall panel 241 is a rectangular panel with four borders 244 extending towards one side of the retained wall. A reinforcing rib 243 is provided on the side of the UHPC wall panel 241 closest to the retained wall. The reinforcing rib 243 is arranged within the area defined by the four borders 244, flush with the borders 244. The horizontally and vertically arranged reinforcing ribs 243 form a cross intersection, dividing one side of the UHPC wall panel 241 into multiple grooves. Since the UHPC wall panel 241 has one or more grooves on the side facing the retained wall, insulation material is filled into the grooves on-site to achieve integrated building structure functionality. The structural cross-section of the inner wall and the arrangement of its reinforcing ribs take into account both the feasibility of component processing and the stability requirements of the thin-plate material.

[0040] The second option, the embedded insulation layer 242, is a prefabricated insulation panel manufactured in the factory. This design eliminates the need for on-site manual filling of insulation material, allowing for direct assembly and improving work efficiency.

[0041] In this embodiment, the inner lining wall 24 is connected to the retained wall via through-wall tie bolts 29. Specifically, a threaded sleeve 245 is pre-embedded in the inner lining wall 24. The threaded sleeve 245 is located at the intersection of the transverse reinforcing ribs 243 and the longitudinal reinforcing ribs 243. A through hole 27 is provided in the retained wall, and a steel sleeve 28 is installed in the hole. The bottom of the steel sleeve 28 has a through hole for the bolt to pass through. The through-wall tie bolt 29 passes through the steel sleeve 28, the through hole 27, and connects to the threaded sleeve 245. The locking operation is achieved by screwing a nut into the steel sleeve 28. The installation of the inner lining wall and its connection with the additional ground beam adopt a pre-embedded part and bolt connection scheme to ensure the structural load-bearing requirements, while also considering the simplicity and ease of implementation of the connection nodes, and maximizing the efficiency of prefabricated construction.

[0042] Preferably, each inner lining wall 24 is connected to the retained wall by three through-wall tie bolts 29, which are distributed longitudinally and located on the same vertical plane. Correspondingly, each inner lining UHPC wall panel 241 is provided with one longitudinally arranged reinforcing rib 243 and two transversely arranged reinforcing ribs 243, and the three reinforcing plates form three cross intersections, with three steel sleeves 28 pre-embedded at the three cross intersections.

[0043] Furthermore, the steel sleeve 28 is filled with polyurethane foam, and small pavilion mud brick pieces 271 are attached to the outside, flush with the outer surface of the preserved wall. Small pavilion mud brick pieces 271 are a type of blue brick primarily used in the walls of traditional Chinese ancient buildings. After tightening the nut and filling with polyurethane foam, small pavilion mud brick pieces 271 are attached to the opening of the through hole 27, making the appearance of the opening in the wall similar in color and appearance to the existing wall's outer surface, thus enhancing its aesthetics.

[0044] In this embodiment, each inner lining wall 24 is formed by splicing multiple lining wall units 240 in the horizontal direction, and the horizontal connection between two adjacent lining wall module units adopts a non-rigid splicing method. There are no splices in the longitudinal direction of the inner lining wall 24, and the bottom of the inner lining wall 24 is directly supported on the added ground beam 4.

[0045] During construction, a right-angle notch is excavated on the existing foundation 3 (such as the original brick foundation), and a new ground beam is cast outward from the right-angle notch, i.e., a ground beam 4 is added to support the inner lining wall 24 above.

[0046] In one alternative embodiment, there is a joint between two adjacent wall module units, and the two are not directly connected, which increases the seismic performance, and the combined section of the new and old walls meets the seismic safety requirements.

[0047] Preferably, a waterproof structure is provided at the joint between two adjacent backing wall module units. For example, the waterproof structure is an airtight membrane 246.

[0048] In this embodiment, the UHPC wall panel 241, precast beam 25, and precast column 26 are all precast using ultra-high performance concrete with incorporated fibers. The precast beam 25 and precast column 26 can be referred to as UHPC precast beam and UHPC precast column, respectively. The fibers incorporated into the preparation of the UHPC wall panel, precast beam, and precast column are any one of steel fiber, glass fiber, or plastic fiber. In one alternative embodiment, both the precast beam 25 and the precast column 26 have hollow cross-sections, and their thin-wall thickness is determined based on mechanical calculations to meet the load-bearing capacity requirements. Both the precast beam 25 and the precast column 26 are integrated thermal insulation structural components, with the hollow portions filled with thermal insulation material for cold bridge prevention.

[0049] To adapt to construction conditions in confined spaces, precast beams 25 and precast columns 26 are assembled on-site using pre-embedded bolt connections. For example, threaded sleeves are pre-embedded in the precast beams 25, and bolts are pre-embedded in the top of the precast columns 26. This pre-embedded bolt connection method for precast beams 25 and precast columns 26 offers advantages such as convenient construction, high installation efficiency, and strong joint load-bearing capacity. The precast beams 25 and precast columns 26 can be transported to the site with minimal site constraints, and then connected on-site using high-strength bolts for rapid on-site assembly.

[0050] In this embodiment, the bottom end of the inner lining wall 24 is provided with a reinforcing bar 247, which faces the interior direction and is anchored in the additional ground beam 4. The reinforcing bar 247 at the bottom end of the inner lining wall 24 extends to the pouring position of the additional ground beam 4, and is directly anchored to the additional ground beam 4 during the pouring of the additional ground beam 4, thus achieving an anchoring connection between the bottom end of the inner lining wall 24 and the additional ground beam 4. This structural design does not bring additional supporting pressure to the existing foundation, and a separate additional ground beam 4 is constructed for the inner lining wall 24 to ensure effective support.

[0051] In this embodiment, the single-piece module 111 is provided with a lower connecting part 1112. The function of the lower connecting part 1112 is twofold: firstly, it allows the tension cable 12 and the self-balancing tie rod 13 to pass through; secondly, it connects to the retaining wall or the UHPC precast beam. Specifically, the single-piece module 111 is provided with two lower connecting parts 1112, which protrude from the inner surface of the single-piece module 111; the positions of the two lower connecting parts 1112 correspond to the positions of the front and rear walls (front eaves wall and rear eaves wall). The single-piece module 111 can slide horizontally on the side where the inner lining wall is set, while the other side is fixed in position. Specifically, the lower connecting part 1112 located on the side of the retaining wall is supported on the top of the inner lining wall on the retaining wall, and the lower connecting part 1112 on the other side is supported on the UHPC precast beam on the opposite side; for example, see Figures 16 to 17 The top surface of the inner lining wall and the top surface of the retained wall are on the same horizontal plane. The bottom surface of the lower connecting part 1112 on this side is flat and can slide onto the top surface of the inner lining wall. The top of the UHPC precast beam is provided with a limiting groove, and the bottom end of the lower connecting part 1112 on the other side is vertically inserted into the limiting groove. The limiting groove is configured to restrict the horizontal displacement of the lower connecting part 1112 on this side. That is to say, the top surface of the inner lining wall and the top surface of the retained wall together play a vertical support role. The inner lining wall plays a major support role, and the single module 111 can generate horizontal displacement on this side. Since the lower connecting part 1112 on the other side of the single module 111 is restricted in the limiting groove at the top of the UHPC precast beam, the single module 111 cannot move horizontally on one side of the UHPC precast beam.

[0052] The lower connecting part 1112 is provided with a first cable through hole and a rod through hole. The center line of the rod through hole is perpendicular to the ridge, so that the self-balancing tie rod 13 can pass through. After the self-balancing tie rod 13 passes through the rod through holes of two single modules 111 in each group of herringbone module units 11, the two ends of the self-balancing tie rod 13 are fixed to the single modules 111 by using a locking nut and washer system. The center line of the first cable through hole is parallel to the ridge, so that the tension cable 12 can pass through. After the tension cable 12 passes through the first cable through holes of multiple single modules 111 on the same side in multiple groups of herringbone module units 11, the two ends of the tension cable 12 are locked by the cable end locking member, so as to lock and fix multiple groups of herringbone module units 11 along the direction parallel to the ridge.

[0053] In this embodiment, the single-piece module 111 has a top connecting part 1111, which is located at the top of the single-piece module 111; in each group of herringbone module units 11, the top connecting parts 1111 of two single-piece modules 111 are connected and locked by bolts 14, so that the two single-piece modules 111 form a herringbone structure.

[0054] Specifically, the top connecting part 1111 has a bolt hole at its top and a second cable through hole at its bottom. The centerline of the second cable through hole is parallel to the roof ridge, allowing the tension cable 12 to pass through. After the tension cable 12 passes through the second cable through holes of multiple single modules 111 on the same side of the multiple sets of herringbone module units 11, the two ends of the tension cable 12 are locked using cable end locking devices, thereby locking and fixing the multiple sets of herringbone module units 11. That is to say, in this embodiment, the multiple sets of herringbone module units 11 are tensioned by four tension cables 12. The number of self-balancing tie rods 13 is the same as the number of herringbone module units 11.

[0055] In this embodiment, the top end of the top connecting part 1111 protrudes upward, and the two top connecting parts 1111 of each group of herringbone module units 11 are connected to form a ridge at the top. The top end of multiple groups of herringbone module units 11 connected in series forms a ridge. The bottom end of the top connecting part 1111 protrudes downward and extends into the herringbone interior space. The two tension cables 12 at this position are arranged in parallel and located on the same horizontal plane.

[0056] In this embodiment, the prefabricated roof system 1 also includes a ridge cover plate 15, which is installed on the ridge. The ridge cover plate 15 is not only aesthetically pleasing, but also rainproof.

[0057] In one alternative embodiment, a first sealing element, which is a waterproof layer 16, is provided between the ridge cover 15 and the ridge. By providing a waterproof layer 16 between the ridge cover 15 and the ridge, water leakage at the ridge is effectively prevented.

[0058] In this embodiment, the individual modules 111 of two adjacent sets of herringbone module units 11 adopt an overlapping connection structure. For example, along the ridge extension direction, both sides of the individual module 111 have U-shaped structures, with one side's U-shaped opening facing upwards and the other side's U-shaped opening facing downwards. The U-shaped openings of adjacent individual modules 111 are matched, enabling continuous overlapping and splicing of multiple individual modules 111. Specifically, each individual module 111 has a concave-convex shape structure, with two lower concave portions and two upper convex portions, arranged alternately. Both sides of the U-shaped structure of the individual module 111 have outer end sidewalls. During overlapping and splicing, the side U-shaped openings of two adjacent individual modules 111 are staggered by a certain distance, and their respective outer end sidewalls are inserted into each other's U-shaped spaces, minimizing the gap between these two outer end sidewalls.

[0059] Because of the overlapping connection structure, water leakage is likely to occur. Therefore, in order to solve the water leakage problem at the overlapping joint of the herringbone module unit 11, this embodiment adopts one of the following two leak prevention measures: The first leak prevention measure, see [link / reference] Figure 14 The overlapping connection structure has a seam, and a second sealing element, namely a rubber expansion waterstop strip 17, is provided at the seam of the overlapping connection structure. When the side U-shaped structures of two adjacent single-piece modules 111 are inserted into each other, the rubber expansion waterstop strip 17 is installed in the seam between the two outer side walls to achieve sealing and waterproofing. Waterproofing measures are set between the herringbone module units, and the prestressing tensioning process is used to achieve structural closure, effectively ensuring the waterproofing performance of the roof.

[0060] For the second leak prevention measure, see [link / reference] Figure 15 The overlapping connection structure has a seam at a certain location. The seam and at least two baffles 1113 within the seam form a ventilation and waterproof channel. The cross-sectional shape of the channel is S-shaped or approximately S-shaped, or it contains at least one S-shaped channel unit. That is, the gap between the two outer end sidewalls of two adjacent monolithic modules 111 is the seam. Each outer end sidewall is provided with a horizontally arranged baffle 1113. The two baffles 1113 are staggered vertically, and the length of the protruding direction of the baffle 1113 is less than the width of the seam. When the U-shaped structures of two adjacent monolithic modules 111 are inserted, the two baffles 1113 are positioned one above the other, and the end of the baffle 1113 on one outer end sidewall does not contact the other outer end sidewall. The two vertically staggered baffles 1113 limit the trajectory of fluid flow within the channel, which is approximately S-shaped. Although airflow can still enter the room through the gaps in this structure, the airflow speed is greatly reduced because the airflow generates circulation in the gaps. Therefore, the airflow cannot bring water into the room, which can effectively improve the waterproof performance of the joints.

[0061] In this embodiment, the prefabricated roofing system 1 also includes an insulation layer, which can be installed on the inner wall of the herringbone module unit 11.

[0062] In this embodiment, the prefabricated roof system 1 also includes a suspended ceiling, which is connected to the lower connecting part 1112 on the single module 111, specifically connected to the side of the lower connecting part 1112; the insulation layer can also be integrated on the suspended ceiling, which adopts an integrated insulation and waterproof panel.

[0063] In this embodiment, the single-piece module 111 is prefabricated from ultra-high performance concrete material incorporating fibers. The types of fibers incorporated include, but are not limited to, high-performance ductility-enhancing fibers such as steel fibers, glass fibers, and plastic fibers.

[0064] The roof foundation material uses ultra-high performance concrete (UHPC). UHPC material has excellent strength (tensile and compressive strength), eliminating the need for additional reinforcement such as steel bars, facilitating processing and installation, and ensuring normal roof use and seismic safety. In terms of manufacturing process, the single-piece module 111 can be constructed using a cast-in-place method, allowing for one-time factory casting without additional on-site wet work. However, the cast-in-place method also has certain limitations: it requires double-sided molds, resulting in relatively flat single-piece modules 111 on both sides, but with a relatively thick and heavy build, and demolding is somewhat difficult, leading to a longer production cycle.

[0065] The single-piece module 111 can also be constructed using shotcrete. Compared to casting, shotcrete construction uses a single-sided mold, making demolding easier. Furthermore, the construction cycle is shorter, and the module can be made thinner, reducing the overall weight of the single-piece module 111. Therefore, this embodiment preferably uses shotcrete construction. For example, the material proportions of the shotcrete are shown in Table 1 below: Table 1 The single-piece module 111 employs a double-layer spraying process, with a total thickness of approximately 12-15mm. Specifically, the single-piece module 111 comprises a surface layer and a structural layer. The surface layer is 2-3mm thick and does not contain steel fibers; the structural layer is 10-12mm thick and contains steel fibers. The spraying application steps are as follows: Step 1: Spray a 2-3mm thick top coat without adding steel fibers to ensure a smooth surface; Step 2: Spray a structural layer with a thickness of 10~12mm and add steel fibers to provide toughness and tensile strength.

[0066] The single-piece module 111 prepared by the above-mentioned spraying process showed excellent mechanical properties according to experimental tests, as follows: the compressive strength reached 110 MPa, which meets the strength standard of ultra-high performance concrete; the elastic tensile strength reached 5 MPa, indicating strong load-bearing capacity in the elastic stage; and the ultimate tensile strength reached 6 MPa, indicating strong maximum tensile capacity before material failure.

[0067] In this embodiment, the shape of the herringbone module unit 11 and the combined roof system 1 is controlled by standardized mold customization and is made with reference to the shape of the traditional courtyard tiled sloping roof to ensure that the style of the sloping roof after the renovation matches the traditional craftsmanship.

[0068] In this embodiment, the new prefabricated integrated renovation system for old town bungalows also integrates a bathroom and kitchen system, as well as a flooring system.

[0069] Compared with existing technologies, the new prefabricated integrated renovation system for old town bungalows provided in this embodiment has at least one of the following beneficial effects: 1. Unlike the traditional renovation model of old town courtyard houses, this invention takes into account the maintenance and continuation of the traditional style of historical buildings while renovating old town courtyard houses. The renovation process takes into account both quality improvement and the continuation of historical culture. The updated renovation method brings about a comprehensive improvement in durability, applicability, systematicness and prefabrication, which is a more efficient, high-quality and green renovation model.

[0070] 2. The roof system's base material is ultra-high performance concrete (UHPC), without additional reinforcement such as steel bars, facilitating processing and installation. The roof structure uses a standard herringbone layout, employing a modular segmentation strategy. The UHPC pouring thickness is thinner, limiting the overall weight of individual modules and ensuring smooth transportation, construction, and installation within confined spaces. The UHPC material strength (tensile and compressive strength) and component cross-sections meet the roof's load-bearing capacity calculation requirements, ensuring normal roof use and seismic safety. Furthermore, the splicing of multiple herringbone module units in the roof system utilizes a combination of prestressed tensioning and bolt fastening, a fully dry, assembly-line process. Through the prestressed cable tensioning method, combined with specialized structures such as steel strands and anchors, the prestressing force is rationally determined, ensuring the roof's overall integrity and combined load-bearing capacity after tensioning. The lower part of the roofing system is equipped with self-balancing tie rods to balance the horizontal thrust of the prefabricated roofing system and reduce the additional load on the lower wall. The self-balancing tie rods use steel tie rod sections and are connected to the pre-set lower connection parts on the single module. A low-stress, easy-to-implement manual tensioning scheme is adopted to control the construction difficulty and ensure the self-balancing effect of the horizontal thrust of the roofing system.

[0071] 3. By adding inner lining walls to the existing walls and effectively integrating the old and new walls with through-wall tie bolts, the vertical bearing capacity of the existing walls is significantly improved. The vertical load transmitted by the roof system is mainly borne by the newly added inner lining walls. Simultaneously, the combined wall system formed by the new inner lining walls and the existing walls shares the horizontal loads such as earthquakes and wind loads. The combined cross-section of the old and new walls meets seismic safety requirements, thus improving seismic performance. Furthermore, the foundation adopts a strategy of continuing the existing foundation to minimize disturbance, and a technical solution of adding ground beams for supplementary support is constructed on the existing foundation. The overall weight of the renovated building does not exceed the existing weight, and no additional foundation load is added, ensuring the foundation safety performance under the low-disturbance renovation strategy.

[0072] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A new type of prefabricated integrated renovation system for old town bungalows, characterized in that, include: The prefabricated roofing system (1) has multiple sets of herringbone module units (11), self-balancing tie rods (13), and tension cables (12); each set of herringbone module units (11) is formed by splicing two single modules (111) together; the self-balancing tie rods (13) are connected between the two single modules (111) of each set of herringbone module units (11), arranged perpendicular to the ridge, and configured to balance the horizontal thrust of the prefabricated roofing system (1); the tension cables (12) are connected to the single modules (111), arranged parallel to the ridge, and configured to prestress the multiple sets of herringbone module units (11) connected in series. The prefabricated composite wall system (2) is used to support the prefabricated roof system (1); the prefabricated composite wall system (2) has an inner lining wall (24), which is fixedly connected to the inner side of the existing wall of the bungalow, and the bottom end of the inner lining wall (24) is fixedly connected to the added ground beam on the inner side of the existing foundation.

2. The new prefabricated integrated renovation system for old town bungalows according to claim 1, characterized in that, The inner wall (24) includes an inner UHPC wall panel (241), and the inner UHPC wall panel (241) is provided with an embedded insulation layer (242).

3. The new prefabricated integrated renovation system for old town bungalows according to claim 2, characterized in that, The inner lining wall (24) is connected to the retaining wall by through-wall tie bolts (29).

4. The new prefabricated integrated renovation system for old town bungalows according to claim 3, characterized in that, A threaded sleeve (245) is pre-embedded in the inner lining wall (24). A through hole (27) is opened in the retaining wall. A steel sleeve (28) is installed in the hole. A through hole for bolts to pass through is provided at the bottom of the steel sleeve (28). The through-wall tie bolt (29) passes through the steel sleeve (28), the through hole (27) and connects with the threaded sleeve (245). The locking operation is achieved by turning the nut in the steel sleeve (28).

5. The new prefabricated integrated renovation system for old town bungalows according to claim 2, characterized in that, Each inner wall (24) is composed of multiple wall units (240) spliced ​​together in the horizontal direction, and the horizontal connection between two adjacent wall module units adopts a non-rigid splicing method.

6. The new prefabricated integrated renovation system for old town bungalows according to claim 2, characterized in that, The existing single-story house retains two gable walls (21) and a rear eaves wall (23), and the inner sides of the gable walls (21) and the rear eaves wall (23) are equipped with the inner lining wall (24). The front wall (22) includes the retained low wall and the prefabricated window wall facade system, which includes doors and windows, prefabricated beams (25) and prefabricated columns (26). The prefabricated beams (25) are horizontally arranged on the gable walls (21) on both sides, and the top of the prefabricated column (26) is vertically connected to the prefabricated beam (25). The prefabricated column (26) is set on the newly added independent foundation (5).

7. The new prefabricated integrated renovation system for old town bungalows according to claim 6, characterized in that, The single-piece module (111), the UHPC wall panel (241), the precast beam (25), and the precast column (26) are all precast using ultra-high performance concrete with added fibers. Preferably, the incorporated fibers are any one of steel fibers, glass fibers, or plastic fibers.

8. The new prefabricated integrated renovation system for old town bungalows according to claim 7, characterized in that, The single-piece module (111) has a top connecting part (1111); in each group of herringbone module units (11), the top connecting parts (1111) of two single-piece modules (111) are locked and fixed by bolts (14); Preferably, the single-piece module (111) is provided with two lower connecting parts (1112), the lower connecting parts (1112) protruding from the inner surface of the single-piece module (111); the lower connecting part (1112) located on one side of the retained wall is supported on the top of the inner lining wall on the retained wall, and the lower connecting part (1112) on the other side is supported on the UHPC precast beam on the opposite side; Preferably, the top surface of the inner lining wall and the top surface of the retained wall are on the same horizontal plane, and the bottom surface of the lower connecting part (1112) on this side is flat and can be slidably overlapped on the top surface of the inner lining wall. The top of the UHPC precast beam is provided with a limiting groove, and the bottom end of the lower connecting part (1112) on the other side is vertically inserted into the limiting groove. The limiting groove is configured to limit the horizontal displacement of the lower connecting part (1112) on that side.

9. The new prefabricated integrated renovation system for old town bungalows according to claim 8, characterized in that, The lower connecting part (1112) is provided with a through hole for rods, the center line of which is perpendicular to the ridge, so that the self-balancing tie rod (13) can pass through. After the self-balancing tie rod (13) passes through the through holes of the two single modules (111) in each group of herringbone module units (11), the two ends of the self-balancing tie rod (13) are fixed to the single modules (111) by using a locking nut and washer system. The lower connecting part (1112) is also provided with a first cable through hole, the center line of which is parallel to the ridge, so that the tension cable (12) can pass through. After the tension cable (12) passes through the first cable through hole of multiple single-piece modules (111) on the same side of the multiple sets of herringbone module units (11), the two ends of the tension cable (12) are locked by the cable end locking member, so as to realize the locking and fixing of the multiple sets of herringbone module units (11) along the direction parallel to the ridge.

10. The new prefabricated integrated renovation system for old town bungalows according to claim 9, characterized in that, The top of the top connecting part (1111) is provided with a bolt hole, and the bottom of the top connecting part (1111) is provided with a second cable through hole. The center line of the second cable through hole is parallel to the ridge so that the tension cable (12) can pass through. Preferably, the top end of the top connecting part (1111) protrudes upward, and the two top connecting parts (1111) of each group of herringbone module units (11) are joined together to form a ridge at the top. The top ends of multiple groups of herringbone module units (11) connected in series form a ridge. The bottom end of the top connecting part (1111) protrudes downward and extends into the herringbone interior space.

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