Fabricated structure cavity spanning existing municipal facilities and optimization design method

Abstract

The invention relates to the technical field of constructional engineering assembly, in particular to an assembly type structure cavity crossing existing municipal facilities and an optimization design method.The structure cavity comprises bottom plate standard parts and wall plate standard parts, plane reserved steel bars are arranged on the bottom plate standard parts, and the adjacent bottom plate standard parts are connected through post-cast strips; the wallboard standard parts are placed on longitudinal and transverse paths of the plane reserved steel bars, and post-pouring areas are formed between the wallboard standard parts and the bottom plate standard parts; the laminated plate is erected at the top of the wallboard standard part, and a cavity is formed among the laminated plate, the wallboard standard part and the bottom plate standard part. The original ground elevation of the existing municipal facilities is lifted through the structural cavity to be consistent with the ground elevation of a newly-built building, the problem that the ground elevation of the newly-built building is not consistent with the original ground elevation of the existing municipal facilities is effectively solved, the structural cavity is assembled through assembly type components, installation and construction are convenient, the construction procedure is greatly simplified, and the construction efficiency is improved. And the construction period is effectively shortened.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering assembly technology, and in particular to an assembled structure cavity spanning existing municipal facilities and an optimization design method. Background Art

[0002] With the rapid advancement of urbanization and the need to build resilient cities, more and more municipal infrastructure is being built, and the existing and new additions are constantly increasing. In the planning, design and implementation of municipal facilities, the subsequent construction of new projects is often ignored, which poses a technical challenge for new ground buildings to cross the existing municipal facilities.

[0003] There is a certain thickness of covering soil above the existing municipal facilities (such as municipal pipe corridors or traffic ring corridors), and there is traffic load on the ground road above the covering soil. At present, there is usually a difference between the ground elevation of new buildings and the original ground (road surface) elevation. When the ground elevation of new buildings is higher than the original ground elevation, if the covering soil is backfilled on the original road surface elevation, it will lead to an increase in the dead load above the existing municipal facilities, and the bearing capacity of the original municipal facilities may be insufficient; if the new structure is rebuilt as a whole, not only will the span be large, the technical difficulty will be high, the cost will be high, and there may not be enough space to construct the structure. If too much of the original covering soil is removed, the dead load above the existing municipal facilities may be reduced, and the existing municipal facilities will have the risk of not meeting the anti-floating requirements, and will cause the foundation or pile foundation below to rebound and deform upward, thereby causing unpredictable risks to the bottom plate of the existing municipal facilities.

[0004] Therefore, the load above the existing municipal facilities should not be increased, and in order to meet the anti-floating requirements, the dead load above them should not be reduced. Therefore, there is an urgent need for a load replacement method that can adapt to the needs of crossing different existing municipal facilities and is convenient for construction.

[0005] Existing technologies mainly focus on replacing light materials or using large-span truss spans. Light materials require a large amount of backfill, are expensive to build, and increase in weight after absorbing water, which may lead to insufficient bearing capacity of the original municipal facilities. Large-span truss spans have complex forces and are difficult to construct.

[0006] When lightweight concrete is used for replacement, the backfill volume is large and the cost is high. Lightweight concrete generally uses foam concrete or polystyrene particle concrete, which has a large number of small holes inside. In groundwater or humid environments, the small holes absorb moisture, which reduces the strength of lightweight concrete and increases the weight of lightweight concrete. Once water enters the interior, it will cause an increase in the dead load above the existing municipal facilities, and the bearing capacity of the original municipal facilities may be insufficient. If a truss span scheme is adopted, if the truss is not detached from the soil below, it is difficult to determine the force transmitted from the bottom of the truss to the top of the existing municipal facilities, and the force on the existing municipal facilities is unclear. When detached, the truss is subjected to a large force. At the same time, the truss is located underground, and it is difficult to use steel structure anti-corrosion treatment and maintenance. Steel-concrete trusses are generally used, but concrete cracking also needs to be considered. In addition, the construction of steel-concrete trusses is complex, the construction operation surface is limited, and the construction quality is difficult to guarantee. Summary of the invention

[0007] The purpose of the present invention is to provide an assembled structural cavity and an optimization design method for crossing existing municipal facilities in order to address the problems existing in the background technology of using a solution of replacing lightweight materials or a solution of crossing with a large span truss when crossing existing municipal facilities.

[0008] In a first aspect, the present invention provides a prefabricated structural cavity spanning an existing municipal facility, comprising a base plate standard component and a wall plate standard component, wherein adjacent base plate standard components are connected by a post-cast strip;

[0009] The bottom plate standard part is provided with a plane reserved steel bar, the wall plate standard part is provided on the longitudinal and transverse paths of the plane reserved steel bar, and a post-casting area is formed between the wall plate standard part and the bottom plate standard part;

[0010] It also includes a composite plate, which is placed on the top of the wall panel standard component, and a cavity is formed between the composite plate, the wall panel standard component and the bottom plate standard component.

[0011] The assembled structure cavity described in the present application includes a base plate standard part, a wall panel standard part and a composite plate. The base plate standard part is provided with a plane reserved steel bar, and the bottom of the wall panel standard part is provided with a vertical connecting bar. After the new ground building is completed, a foundation pit is first excavated on the original covering soil layer of the existing municipal facilities to a designed depth, and then the base plate standard part is laid at the bottom of the foundation pit. Adjacent base plate standard parts are connected by post-cast strips, and plane reserved steel bars are set on the base plate in advance. The wall panel standard parts are placed on the longitudinal and transverse paths of the plane reserved steel bars. After a post-casting area is formed between the wall panel standard parts and the base plate standard parts, the wall panel standard parts and the base plate standard parts are connected by pouring the post-casting area. The standard parts of the panels are connected together, and then the composite panels are erected on the top of the wall panel standard parts to form a cavity between the composite panels, the wall panel standard parts and the bottom plate standard parts, thereby realizing the spanning plan of using the structural cavity to replace the covering soil above the existing municipal facilities with equal weight. The structural cavity is used to raise the original ground elevation of the existing municipal facilities to be consistent with the ground elevation of the new building, effectively solving the problem of inconsistency between the ground elevation of the new building and the original ground elevation of the existing municipal facilities. Furthermore, the prefabricated structural cavity of the present application is assembled using prefabricated components, which is easy to install and construct, greatly simplifies the construction process, and effectively shortens the construction period.

[0012] Preferably, it also includes a cast-in-place layer, and the cast-in-place layer is laid on the composite board. The present application uses the composite board as the top plate, and the cast-in-place layer is laid after the composite board is installed. The multiple composite boards are connected into one by the cast-in-place layer to enhance the stability and seismic resistance of the composite board. Furthermore, the composite board is used in combination with the cast-in-place layer as the top plate. During on-site construction, no formwork is required, and only the prefabricated panels need to be placed in place, which reduces the installation and disassembly of the support and formwork, reduces the erection time of the formwork and support system, and the overall construction progress is faster.

[0013] Preferably, vertical connecting bars are reserved at the bottom of the standard wall panel parts, and the vertical connecting bars are connected to the reserved planar steel bars. The vertical connecting bars of the standard wall panel parts are connected to the reserved planar steel bars of the standard bottom plate parts, thereby forming a steel cage in the post-casting area.

[0014] Preferably, holes are provided on the standard wall panel component, and the holes are arranged at intervals along the length direction of the standard wall panel component. The weight of the structural cavity can be further reduced by providing the holes.

[0015] Preferably, mutually connected hidden columns and hidden beams are also provided inside the standard wall panel component, the hidden columns are arranged at intervals along the length direction of the standard wall panel component, the hidden beams are arranged at intervals along the height direction of the standard wall panel component, and the holes are formed between the hidden columns and the hidden beams.

[0016] Preferably, temporary piers are provided at the bottom of both ends of the wall panel standard parts, and the temporary piers abut against the bottom plate standard parts. By providing temporary piers at the bottom of both ends of the wall panel standard parts, when the bottom plate standard parts are installed, the temporary piers at the bottom of the wall panel standard parts abut against the bottom plate standard parts, which plays a role in leveling the wall and temporarily fixing the wall.

[0017] Preferably, the reserved steel bars of the bottom plate include longitudinal ribs and transverse ribs, and the longitudinal ribs and the transverse ribs are arranged in a cross shape;

[0018] The standard wall panel parts are divided into longitudinal wall panels and transverse wall panels. The longitudinal wall panels are installed on the longitudinal rib paths, and the transverse wall panels are installed on the transverse rib paths.

[0019] Preferably, it further comprises a cross-shaped wall, wherein the cross-shaped wall is arranged at the intersection of the longitudinal wall panels and the transverse wall panels.

[0020] A cross wall is set at the intersection of the longitudinal wall panels and the transverse wall panels, and the longitudinal wall panels and the transverse wall panels are connected by the cross wall to strengthen the integrity of the wall and improve the overall strength of the wall.

[0021] In a second aspect, the present invention provides a method for optimizing the design of the prefabricated structure cavity described in the present application, comprising the following steps:

[0022] A1: Obtain the original cover soil pressure value p0 according to the original cover soil thickness and cover soil bulk density;

[0023] A2: Obtain the deadweight of the cavity according to the size parameters of the structural cavity, and obtain the weight of the surface layer according to the thickness parameters of the building surface layer above the structural cavity;

[0024] A3: Reconstructing the displacement pressure model after displacement according to the deadweight of the cavity and the surface layer;

[0025] A4: Preset the size value of the structural cavity and the thickness value of the building surface layer, bring the preset size value and thickness value into the displacement pressure model, and obtain the corresponding displacement pressure value p1;

[0026] A5: Compare the original cover pressure value p0 with the replacement pressure value p1:

[0027] If the error range of p0 and p1 is within -5% to +5%, the preset size value and thickness value are the final design values;

[0028] If the error range between p0 and p1 is outside the range of -5% to +5%, the preset size value and thickness value are adjusted, and steps A4-A5 are repeated.

[0029] The optimization design method of the present application obtains the deadweight of the cavity according to the size parameters of the structural cavity, obtains the weight of the surface layer according to the thickness parameters of the building surface layer above the structural cavity, and constructs a replacement pressure model after replacement according to the deadweight of the cavity and the weight of the surface layer. Then, the preset size parameter values ​​of the structural cavity and the thickness values ​​of the building surface layer are substituted into the replacement pressure model to obtain the corresponding replacement pressure value. Then, the obtained replacement pressure value is compared with the original covering soil pressure value. If the error range is within the specification, the preset size values ​​of the structural cavity and the thickness values ​​of the building surface layer are used as the final design values. If the error range is outside the specification, the preset size values ​​of the structural cavity and the thickness values ​​of the building surface layer are adjusted and re-substituted into the replacement pressure model. The comparison is repeated to ensure that the soil pressure generated by the remaining covering soil after the structural cavity replacement and the sum of the structural cavity base pressure under the constant load condition are approximately equal to the original covering soil pressure, thereby achieving the purpose of equal weight replacement.

[0030] Preferably, in A2, the deadweight of the cavity is obtained according to the size parameters of the structural cavity:

[0031] G2=γ 砼 [(H1+H4)S1S2+(S1H2-h0a1n1)b+(S2H2-h0a2n2)b+H3(S1+S2-B)B];

[0032] Where: G2 is the deadweight of the cavity, S1 is the horizontal wallboard spacing, S2 is the vertical wallboard spacing, B is the width of the thickened area under the wall, b is the wallboard thickness, a1 is the width of the longitudinal wallboard opening, a2 is the width of the transverse wallboard opening, h0 is the height of the vertical and horizontal wall openings, n1 is the number of horizontal wallboard openings, n2 is the number of horizontal wallboard openings, H1 is the top plate thickness, H2 is the vertical and horizontal wall heights, H3 is the thickened area thickness, H4 is the bottom plate thickness, γ 砼 is the bulk density of reinforced concrete;

[0033] In A2, the surface layer weight is obtained according to the thickness parameter of the building surface layer above the structural cavity:

[0034] G1=γ m c2S1S2;

[0035] Where G1 is the surface layer weight, γ m is the average bulk density of the building surface layer, S1 is the horizontal wall panel spacing, S2 is the longitudinal wall panel spacing, and c2 is the thickness of the building surface layer.

[0036] Preferably, in A3, the replaced pressure model is:

[0037]

[0038] In the formula, p1 is the displacement pressure value, G1 is the surface layer weight, G2 is the cavity deadweight, c1 is the cushion height, γ1 is the cushion bulk density, γ is the cover soil bulk density, h2 is the original cover soil thickness, H is the structural cavity height, h1 is the distance from the original pavement to the top surface of the structural cavity, and A is the standard unit cell area of ​​the structural cavity.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The prefabricated structural cavity described in the present application includes a base plate standard part, a wall panel standard part and a composite plate. The base plate standard part is provided with a plane reserved steel bar, and the bottom of the wall panel standard part is provided with a vertical connecting bar. After the completion of the new ground building, a foundation pit is first excavated on the original covering layer of the existing municipal facilities to the designed depth, and then the base plate standard part is laid at the bottom of the foundation pit. Adjacent base plate standard parts are connected by a post-casting strip, and plane reserved steel bars are set on the base plate in advance. The wall panel standard parts are placed on the longitudinal and transverse paths of the plane reserved steel bars, so that a post-casting area is formed between the wall panel standard parts and the base plate standard parts. When the post-casting area is cast, the wall panel standard parts and The base plate standard parts are connected together, and then the composite plate is erected on the top of the wall panel standard parts to form a cavity between the composite plate, the wall panel standard parts and the base plate standard parts, thereby realizing a spanning scheme of replacing the soil covering above the existing municipal facilities with equal weight by using the structural cavity. The original ground elevation of the existing municipal facilities is raised through the structural cavity to be consistent with the ground elevation of the new building, effectively solving the problem of inconsistency between the ground elevation of the new building and the original ground elevation of the existing municipal facilities. Furthermore, the prefabricated structural cavity of the present application is assembled using prefabricated components, which is easy to install and construct, greatly simplifies the construction process, and effectively shortens the construction period.

[0041] 2. The optimization design method of the present application obtains the deadweight of the cavity according to the size parameters of the structural cavity, obtains the weight of the surface layer according to the thickness parameters of the building surface layer above the structural cavity, and constructs a replacement pressure model after replacement according to the deadweight of the cavity and the weight of the surface layer. Then, the preset size parameter values ​​of the structural cavity and the thickness values ​​of the building surface layer are substituted into the replacement pressure model to obtain the corresponding replacement pressure value. Then, the obtained replacement pressure value is compared with the original covering soil pressure value. If the error range is within the specification, the preset size values ​​of the structural cavity and the thickness values ​​of the building surface layer are the final design values. If the error range is outside the specification, the preset size values ​​of the structural cavity and the thickness values ​​of the building surface layer are adjusted and re-substituted into the replacement pressure model. The comparison is repeated to ensure that the soil pressure generated by the remaining covering soil after the structural cavity replacement and the sum of the base pressure of the structural cavity under the constant load condition are approximately equal to the original covering soil pressure, thereby achieving the purpose of equal weight replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic elevation view of the structural cavity of the present application.

[0043] Figure 2 It is a schematic diagram of the plan layout of the base plate and wall panels of the structural cavity.

[0044] Figure 3 yes Figure 2 A partial schematic diagram of .

[0045] Figure 4 It is a schematic diagram of the base plate standard parts.

[0046] Figure 5 yes Figure 4 Cross-sectional view at AA.

[0047] Figure 6 yes Figure 4 Cross-sectional view at BB.

[0048] Figure 7 is a schematic diagram of the longitudinal wall panel.

[0049] Figure 8 is a schematic diagram of the horizontal wall panel.

[0050] Fig. 9 It is a schematic diagram of the connection between the wall panel and the base plate.

[0051] Fig.10 This is a schematic diagram of the connection of a cross-shaped wall.

[0052] Fig.11 It is a schematic diagram of the elevation of the longitudinal road along the existing municipal facilities.

[0053] Markings in the figure:

[0054] 1- standard parts of base plate, 11- reserved steel bars in plane, 111- longitudinal ribs, 112- transverse ribs, 13- hooks, 2- standard parts of wall panels, 21- vertical connecting bars, 22- holes, 23- hidden columns, 24- hidden beams, 210- longitudinal wall panels, 220- transverse wall panels, 3- composite slabs, 4- post-casting area, 5- cavity, 6- cast-in-place layer, 7- temporary piers, 8- cross-shaped walls, 10- post-casting strips. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0056] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0057] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0058] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0059] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0060] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0061] Example 1

[0062] like Figure 1-Figure 3 As shown, the assembled structural cavity spanning existing municipal facilities described in this embodiment includes a base plate standard component 1 and a wall plate standard component 2, and adjacent base plate standard components 1 are connected by a post-cast strip 10;

[0063] A plane reserved steel bar 11 is arranged on the bottom plate standard part 1, and the wall plate standard part 2 is arranged on the longitudinal and transverse paths of the plane reserved steel bar 11, and a post-casting area 4 is formed between the wall plate standard part 2 and the bottom plate standard part 1;

[0064] It also includes a composite board 3, which is placed on the top of the wall panel standard component 2, and a cavity 5 is formed between the composite board 3, the wall panel standard component 2 and the bottom plate standard component 1.

[0065] After the completion of the new ground building, the foundation pit is first excavated on the original covering soil layer of the existing municipal facilities to the designed depth, and then the bottom plate standard parts 1 are laid at the bottom of the foundation pit, and the adjacent bottom plate standard parts 1 are connected by the post-casting strips 10, and the plane reserved steel bars 11 are set on the bottom plate standard parts 1 in advance, and the wall panel standard parts 2 are placed on the longitudinal and transverse paths of the plane reserved steel bars 11, so that the post-casting area 4 is formed between the wall panel standard parts 2 and the bottom plate standard parts 1, and the wall panel standard parts 2 and the bottom plate standard parts 1 are connected together when the post-casting area 4 is cast, and then the composite slab 3 is erected on the wall panel standard parts The top of the standard part 2 is formed between the composite plate 3, the wall panel standard part 2 and the bottom plate standard part 1, thereby realizing the spanning plan of using the structural cavity to replace the covering soil above the existing municipal facilities with equal weight. The structural cavity is used to raise the original ground elevation of the existing municipal facilities to make it consistent with the ground elevation of the new building, effectively solving the problem of inconsistency between the ground elevation of the new building and the original ground elevation of the existing municipal facilities. Furthermore, the prefabricated structural cavity is assembled with prefabricated components, which is easy to install and construct, greatly simplifies the construction process, and effectively shortens the construction period.

[0066] In one or more embodiments, Figure 1 As shown, it also includes a cast-in-place layer 6, which is laid on the composite slab 3.

[0067] The present embodiment adopts the composite slab 3 as the top slab, and after the composite slab 3 is installed, the cast-in-place layer 6 is laid, and the multiple composite slabs 3 are connected into one by the cast-in-place layer 6, so as to enhance the stability and earthquake resistance of the composite slab 3. Furthermore, the composite slab 3 is used in combination with the cast-in-place layer 6 as the top slab, and no formwork is required during on-site construction. Only the prefabricated panels need to be placed in place, which reduces the installation and disassembly work of the support and formwork, reduces the erection time of the formwork and the support system, and makes the overall construction progress faster.

[0068] In an optional embodiment, if Figure 1As shown, the post-cast strip 10 is located at the mid-span of the top plate composite plate 3. Concentrated stress is avoided, thereby improving the stability and safety of the overall structure. Considering the standardization of the assembled bottom plate, the post-cast strip 10 of the bottom plate standard part 1 is set at the mid-span.

[0069] In one or more embodiments, Figure 1 , Figure 4 , Figure 7 As shown, vertical connecting bars 21 are reserved at the bottom of the wall panel standard part 2, and the vertical connecting bars 21 are connected to the plane reserved steel bars 11. The vertical connecting bars 21 of the wall panel standard part 2 are connected to the plane reserved steel bars 11 of the bottom plate standard part 1, thereby forming a steel cage in the post-casting area 4.

[0070] In one or more embodiments, Figure 7-Figure 8 As shown, holes 22 are provided on the wall panel standard part 2, and the holes 22 are arranged at intervals along the length direction of the wall panel standard part 2. The holes 22 are provided to further reduce the weight of the structural cavity.

[0071] In an optional embodiment, if Figure 7-Figure 8 As shown, the interior of the standard wall panel component 2 is also provided with mutually connected hidden columns 23 and hidden beams 24. The hidden columns 23 are arranged at intervals along the length direction of the standard wall panel component 2, and the hidden beams 24 are arranged at intervals along the height direction of the standard wall panel component 2. Holes 22 are formed between the hidden columns 23 and the hidden beams 24, and the standard wall panel component 2 is composed of the hidden columns 23 and the hidden beams 24.

[0072] In an optional embodiment, if Figure 7 As shown in FIG8 , temporary piers 7 are also provided at the bottom of both ends of the wall panel standard component 2, and the temporary piers 7 abut against the bottom plate standard component 1. By providing temporary piers 7 at the bottom of both ends of the wall panel standard component 2, when the wall panel standard component 2 is installed on the bottom plate standard component, the temporary piers 7 at the bottom of the wall panel standard component 2 abut against the bottom plate standard component 1, which plays the role of leveling the wall and temporarily fixing the wall.

[0073] Furthermore, the temporary piers 7 are arranged at the bottom of the hidden columns 23 at both ends of the wall panel standard component 2, that is, the temporary piers 7 are connected to the hidden columns 23 located at both ends of the wall panel standard component 2.

[0074] Example 2

[0075] On the basis of Example 1, Figure 4-Figure 6 As shown, in the present embodiment, a prefabricated structural cavity spanning an existing municipal facility, the plane reserved steel bar 11 includes a longitudinal cross-shaped steel bar 111 and a transverse cross-shaped steel bar 112, and the longitudinal cross-shaped steel bar 111 and the transverse cross-shaped steel bar 112 are arranged in a cross shape;

[0076] like Figure 3As shown, the wall panel standard part 2 is divided into a longitudinal wall panel 210 and a transverse wall panel 220 . The longitudinal wall panel 210 is installed on the path of the longitudinal ribs 111 , and the transverse wall panel 220 is installed on the path of the transverse ribs 112 .

[0077] The longitudinal and transverse installation of the wall panel standard component 2 on the base plate standard component 1 is achieved by installing the longitudinal wall panel 210 on the path of the longitudinal rib 111 and the transverse wall panel 220 on the path of the transverse rib 112 .

[0078] In one or more embodiments, Fig.10 As shown, a cross wall 8 is also included, and the cross wall 8 is arranged at the intersection of the longitudinal wall panel 210 and the transverse wall panel 220.

[0079] A cross-shaped wall 8 is provided at the intersection of the longitudinal wall panel 210 and the transverse wall panel 220. The longitudinal wall panel 210 and the transverse wall panel 220 are connected by the cross-shaped wall 8 to strengthen the integrity of the wall and improve the overall strength of the wall.

[0080] In an optional embodiment, a first hook with a 135° angle is used to connect the two ends of the cross-shaped wall 8 to the steel bars, and a second hook with a 135° angle is used to connect the ends of the horizontal bars extending from the longitudinal wall panel 210 and the transverse wall panel 22 close to the cross-shaped wall 8. The first hook and the second hook are then connected together using horizontal steel bars to form an integral steel cage.

[0081] Example 3

[0082] Based on Example 1 or Example 2, this embodiment discloses an optimization design method for the assembled structure cavity of Example 1 or Example 2, comprising the following steps:

[0083] A1: Obtain the original cover soil pressure value p0 according to the original cover soil thickness and cover soil bulk density;

[0084] A2: According to the size parameters of the structural cavity, the deadweight of the cavity is obtained, and according to the thickness parameters of the building surface layer above the structural cavity, the weight of the surface layer is obtained;

[0085] A3: The displacement pressure model after displacement is constructed based on the cavity deadweight and surface layer weight;

[0086] A4: Preset the size value of the structural cavity and the thickness value of the building surface layer, bring the preset size value and thickness value into the displacement pressure model, and obtain the corresponding displacement pressure value p1;

[0087] A5: Compare the original cover pressure value p0 with the replacement pressure value p1:

[0088] If the error range between p0 and p1 is within -5% to +5%, the preset size and thickness values ​​are the final design values;

[0089] If the error range between p0 and p1 is outside the range of -5% to +5%, adjust the preset size value and thickness value, and repeat steps A4-A5.

[0090] A displacement pressure model is constructed according to the size parameters of the structural cavity and the surface thickness of the structural cavity, and then the preset size parameter values ​​of the structural cavity and the surface thickness values ​​of the structural cavity are substituted into the displacement pressure model to obtain the corresponding displacement pressure value. Then, the obtained displacement pressure value is compared with the original cover soil pressure value. If the error range is within the specification, the preset size parameter values ​​of the structural cavity and the surface thickness values ​​of the structural cavity are used as the final design values. If the error range is outside the specification, the preset size parameter values ​​of the structural cavity and the surface thickness values ​​of the structural cavity are adjusted and re-substituted into the displacement pressure model for calculation. The comparison is repeated to ensure that the soil pressure generated by the remaining cover soil after the structural cavity replacement and the sum of the base pressure of the structural cavity under the constant load condition are equal to the original cover soil pressure, thereby achieving the purpose of equal weight replacement.

[0091] The preset structural cavity size values ​​and building surface thickness values ​​in this embodiment refer to the assumed structural cavity size parameter values ​​and the assumed building surface thickness parameter values, which are assumed based on design requirements and actual on-site conditions, after measuring the existing municipal facilities and the original ground elevation. The preset replacement pressure value p1 is then obtained by bringing them into the displacement pressure model, which is then compared with the original cover pressure value p0.

[0092] In an optional implementation manner, in A1, the calculation model of the original cover pressure value is:

[0093] p0=γh2

[0094] Where γ is the bulk density of cover soil and h2 is the original cover soil thickness.

[0095] In an optional implementation, in A2, the deadweight of the cavity is obtained according to the size parameters of the structural cavity:

[0096] G2=γ 砼 [(H1+H4)S1S2+(S1H2-h0a1n1)b+(S2H2-h0a2n2)b+H3(S1+S2-B)B];

[0097] Where: G2 is the deadweight of the cavity, S1 is the spacing of the transverse wall panels 220, S2 is the spacing of the longitudinal wall panels 210, B is the width of the thickened area under the wall (the width of the post-casting area 4), b is the thickness of the wall panel, a1 is the width of the opening of the longitudinal wall panel 210, a2 is the width of the opening of the transverse wall panel 220, h0 is the height of the openings in the longitudinal and transverse walls, n1 is the number of openings in the transverse wall panel 220, n2 is the number of openings in the transverse wall panel 220, H1 is the thickness of the top plate, H2 is the height of the longitudinal and transverse walls, H3 is the thickness of the thickened area (the thickness of the post-casting area 4), H4 is the thickness of the bottom plate, γ 砼 is the bulk density of reinforced concrete, see Figure 3 , Figure 7 , Figure 8 , Fig. 9 , Fig.11 ;

[0098] In A2, the surface layer weight is obtained according to the thickness parameter of the building surface layer above the structural cavity:

[0099] G1=γ m c2S1S2;

[0100] Where G1 is the surface layer weight, γ m is the average bulk density of the building surface layer, S1 is the spacing of the horizontal wall panels 220, S2 is the spacing of the vertical wall panels 210, and c2 is the thickness of the building surface layer. Fig.11 .

[0101] In an optional implementation, in A3, the pressure model after substitution is:

[0102]

[0103] Where p1 is the displacement pressure value, G1 is the surface layer weight, G2 is the cavity deadweight, c1 is the cushion height, γ1 is the cushion bulk density, γ is the cover soil bulk density, h2 is the original cover soil thickness, H is the structural cavity height, h1 is the distance from the original pavement to the top surface of the structural cavity, and A is the standard unit cell area of ​​the structural cavity, that is, A = S1 × S2, see Fig.11 .

[0104] Among them, h1 = zero elevation of new building - elevation of road surface above existing municipal facilities - thickness of building ground surface layer c2.

[0105] In this embodiment, the sum of the earth pressure generated by the remaining covering soil and the base pressure of the structure cavity under constant load conditions is equal to the original covering soil pressure, which means: the earth pressure generated by the remaining covering soil + the pressure generated by the sum of the weight of the structure cavity and the building surface layer and the pressure generated by the cushion layer = the pressure generated by the original covering soil.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled structural cavity spanning an existing municipal facility, characterized in that: It comprises a base plate standard component (1) and a wall plate standard component (2), wherein adjacent base plate standard components (1) are connected via a post-casting strip (10); The base plate standard component (1) is provided with a planar reserved steel bar (11), the wall plate standard component (2) is provided on the longitudinal and transverse paths of the planar reserved steel bar (11), and a post-casting area (4) is formed between the wall plate standard component (2) and the base plate standard component (1); It also comprises a composite plate (3), wherein the composite plate (3) is placed on top of the wall panel standard component (2), and a cavity (5) is formed between the composite plate (3), the wall panel standard component (2) and the bottom plate standard component (1).

2. The assembled structure cavity spanning existing municipal facilities according to claim 1, characterized in that: It also comprises a cast-in-place layer (6), wherein the cast-in-place layer (6) is laid on the composite slab (3).

3. The assembled structure cavity spanning existing municipal facilities according to claim 1, characterized in that: A vertical connecting rib (21) is reserved at the bottom of the wall panel standard part (2), and the vertical connecting rib (21) is connected to the plane reserved steel bar (11).

4. The assembled structure cavity spanning existing municipal facilities according to claim 1, characterized in that: The wall panel standard component (2) is provided with holes (22), and the holes (22) are arranged at intervals along the length direction of the wall panel standard component (2).

5. The assembled structure cavity spanning existing municipal facilities according to claim 4, characterized in that: The standard wall panel component (2) is also provided with mutually connected hidden columns (23) and hidden beams (24), wherein the hidden columns (23) are arranged at intervals along the length direction of the standard wall panel component (2), and the hidden beams (24) are arranged at intervals along the height direction of the standard wall panel component (2), and the hole (22) is formed between the hidden columns (23) and the hidden beams (24).

6. The assembled structure cavity spanning across existing municipal facilities according to claim 5, characterized in that: Temporary piers (7) are also provided at the bottom of both ends of the wall panel standard component (2), and the temporary piers (7) are in contact with the bottom plate standard component (1).

7. The assembled structure cavity spanning existing municipal facilities according to claim 1, characterized in that: The plane reserved steel bars (11) include longitudinal cross-shaped bars (111) and transverse cross-shaped bars (112), wherein the longitudinal cross-shaped bars (111) and the transverse cross-shaped bars (112) are arranged in a cross shape; The standard wall panel part (2) is divided into a longitudinal wall panel (210) and a transverse wall panel (220). The longitudinal wall panel (210) is installed on the path of the longitudinal ribs (111), and the transverse wall panel (220) is installed on the path of the transverse ribs (112).

8. The assembled structure cavity spanning existing municipal facilities according to claim 7, characterized in that: It also includes a cross-shaped wall (8), which is arranged at the intersection of the longitudinal wall panel (210) and the transverse wall panel (220).

9. An optimization design method for a prefabricated structure cavity as claimed in any one of claims 1 to 8, characterized in that: The steps include: A1: Obtain the original cover soil pressure value p0 according to the original cover soil thickness and cover soil bulk density; A2: Obtain the deadweight of the cavity according to the size parameters of the structural cavity, and obtain the weight of the surface layer according to the thickness parameters of the building surface layer above the structural cavity; A3: Reconstructing the displacement pressure model after displacement according to the deadweight of the cavity and the surface layer; A4: Preset the size value of the structural cavity and the thickness value of the building surface layer, bring the preset size value and thickness value into the displacement pressure model, and obtain the corresponding displacement pressure value p1; A5: Compare the original cover pressure value p0 with the replacement pressure value p1: If the error range of p0 and p1 is within -5% to +5%, the preset size value and thickness value are the final design values; If the error range between p0 and p1 is outside the range of -5% to +5%, the preset size value and thickness value are adjusted, and steps A4-A5 are repeated.

10. The optimization design method according to claim 9, characterized in that: In A3, the pressure model after substitution is: In the formula, p1 is the displacement pressure value, G1 is the surface layer weight, G2 is the cavity deadweight, c1 is the cushion height, γ1 is the cushion bulk density, γ is the cover soil bulk density, h2 is the original cover soil thickness, H is the structural cavity height, h1 is the distance from the original pavement to the top surface of the structural cavity, and A is the standard unit cell area of ​​the structural cavity.

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