Fabricated cavity concrete replacing and filling device crossing top of underground municipal pipe gallery and construction method

Abstract

The invention relates to an assembly type cavity concrete replacing and filling device crossing the top of an underground municipal pipe gallery and a construction method.A replacing and filling foundation pit is excavated downwards in an overburden layer above the pipe gallery, a cavity structure is laid in the replacing and filling foundation pit and comprises a base, a vertical wall I, a vertical wall II and a laminated slab, and a cross-shaped mounting groove is formed in the base; the multiple sets of bases are distributed in a linear array mode to form a supporting foundation, and in the supporting foundation, the installation grooves correspond to one another to form transverse grooves and longitudinal grooves. The vertical walls are installed in the transverse grooves and the longitudinal grooves in a matched mode, and then a grid-shaped supporting system is formed. The laminated plate is assembled on the vertical wall so as to seal the upper portion of the supporting system. The cavity structure is good in integrity, no wall body coincidence exists between the cells, the self weight of the wall body is relatively light, economical, green and low-carbon in assembly, and rapid assembly and disassembly can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated building construction, and in particular to a prefabricated cavity concrete replacement device and a construction method that spans the top of an underground municipal pipe gallery. Background Art

[0002] With the rapid advancement of urbanization and the demand for resilient city construction, more and more municipal infrastructure is being built, and the existing and new amounts are constantly increasing. In the process of planning and implementing municipal facilities, the subsequent construction of new projects is often ignored. This poses a technical challenge to how new ground buildings can transcend existing municipal facilities.

[0003] For example, when a new ground building is located between existing buildings, there will especially be a situation where the building crosses the pipeline corridor. Moreover, when the new building is under construction, since most of the original main labor team has withdrawn from the site, it is difficult to reorganize the various types of work. At the same time, the interior and exterior decoration of the buildings on both sides of the site have begun, and the on-site space occupies a large amount of space. The traditional processing areas for the main stages such as steel bars and carpentry can no longer be retained, and the construction site is greatly restricted, causing construction difficulties.

[0004] In addition, during the construction of new buildings, the elevation of the bottom of the building needs to be coordinated with the elevation of the surrounding existing municipal roads. However, due to the existence of the existing pipe corridor structure, there will be an elevation difference between the new building and the road surface above the pipe corridor. Therefore, it is necessary to compensate for this elevation difference to ensure that the elevation of the bottom of the building meets the design requirements and meets the standard of building function and use.

[0005] However, when the tunnel structure is designed, its tolerable load limit is clearly defined, which is usually a constant value. If the traditional concrete replacement and padding method is used when crossing the tunnel, the foundation load will often increase significantly, exceeding the design bearing capacity of the tunnel, and thus causing deformation or damage to the tunnel structure.

[0006] Therefore, there is an urgent need for a ground modification plan for crossing the pipeline corridor with simple construction, low construction cost and fast construction speed, so as to enable new buildings to cross existing municipal facilities under limited construction conditions and solve the problems of elevation difference and load limitation. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide an assembled cavity concrete replacement device and construction method across the top of an underground municipal pipeline corridor, so as to effectively solve the problem of ground modification of newly built ground buildings and the difficulty of simple and quick construction in a limited space while ensuring the protection of the pipeline corridor.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an assembled cavity concrete replacement device spanning the top of an underground municipal pipe gallery, a replacement pit is excavated downward from the overburden layer above the pipe gallery, a cavity structure is paved in the replacement pit, the cavity structure includes a base, a vertical wall I, a vertical wall II and a composite plate, the base has a cross-shaped installation groove; multiple groups of bases are distributed in a linear array to form a supporting foundation, in the supporting foundation, the installation grooves correspond to each other to form transverse grooves and longitudinal grooves; the vertical walls are adapted to be installed in the transverse grooves and longitudinal grooves, thereby forming a lattice-shaped support system; the composite plate is assembled on the vertical walls to close the upper part of the support system.

[0009] Furthermore, the base is distributed along a horizontal and vertical linear array to form a supporting foundation, and the top surface of the base is provided with mounting grooves, which include horizontal grooves and vertical grooves. The horizontal grooves and vertical grooves intersect at the center of the base in a cross shape, thereby dividing a base into four identical sections, and a bottom plate hook is fixed in the middle of each base section.

[0010] Furthermore, a plain concrete cushion layer is provided under the base, and the base is distributed on the concrete cushion layer in a transverse and longitudinal array, so that the transverse grooves and longitudinal grooves between adjacent bases correspond to each other, and a criss-cross post-casting area I is formed between adjacent whole bases.

[0011] Furthermore, both the vertical wall I and the vertical wall II are prefabricated reinforced concrete wall panel components, and the height and width of the two are the same, and the length of the vertical wall I is greater than that of the vertical wall II.

[0012] Furthermore, temporary piers are symmetrically provided on both sides of the bottom of the vertical wall I and the vertical wall II, and a vertical wall hook is fixed in the center of the corresponding wall above the piers, and a hollow area is provided in the middle of each vertical wall.

[0013] Furthermore, the vertical wall I spans over two adjacent bases and is vertically installed in the horizontal grooves of the adjacent bases through temporary piers at the bottom of the vertical wall I and the bent steel bars in the wall; the vertical wall II spans over two adjacent bases and is vertically installed in the longitudinal grooves of the adjacent bases through temporary piers at the bottom of the vertical wall II and the bent steel bars in the wall.

[0014] Furthermore, a gap is left between the side wall below each vertical wall and the groove wall of the installation groove on the base to form a cross-shaped post-casting area.

[0015] Furthermore, the ends of the transversely arranged vertical wall I and the longitudinally arranged vertical wall II form a cross-shaped area with the center of the installation groove on the base, and the area forms a cross-shaped hidden column by tying steel bars, and concrete is poured into the cross-shaped hidden column to form a post-cast cross-shaped wall.

[0016] Furthermore, a protruding structure is formed upwardly at the middle of the top of the vertical wall I and the vertical wall II, and two sides of the protrusion are used for assembly with the composite plate.

[0017] The present invention also provides a method for replacing the construction of assembled cavity concrete across the top of an underground municipal pipe gallery, comprising the following steps: Step 1: Bottom plate construction: first lay a layer of C20 plain concrete cushion on the top soil of the pipe gallery, install the base on the concrete cushion in a horizontal and vertical linear array distribution, ensure that the installation grooves correspond to each other, form horizontal grooves and vertical grooves, form a post-casting area I between adjacent bases, and pour concrete in the criss-cross post-casting area I formed between adjacent bases; Step 2: Construction of cross-shaped hidden columns: accurately lay out the position line of the cross-shaped hidden columns on the base, tie the main reinforcement and stirrups to form a stable reinforcement skeleton; Step 3: vertical wall construction; hoist and assemble vertical wall I in the horizontal direction to the center of the horizontal groove on the adjacent bottom plate, and hoist and assemble vertical wall II in the vertical direction to the center of the longitudinal groove on the adjacent bottom plate, use temporary piers at the bottom of each vertical wall to provide support, pour concrete in the post-casting area II, and fix the vertical wall vertically on the base; Step 4: Post-cast cross-shaped wall casting: Concrete is poured on the cross-shaped hidden columns formed in the middle of each bottom plate, so that the side walls around it are flush with the vertical walls, and the top is flush with the top of each vertical wall, thereby forming a plurality of evenly arranged grid unit modules to form a grid-like support system; Step 5: Installation and pouring of the composite slab; hoist the composite slab above the grid unit module to achieve precise docking and laying of the composite slab and the vertical wall; then pour concrete into the cast-in-place layer of the composite slab on the top surface of the composite slab to complete the closure of the upper part of the support system.

[0018] The beneficial effect of the above technical solution is that the assembled cavity concrete replacement device for crossing the top of the underground municipal pipeline corridor provided by the present invention can achieve the spanning of new buildings under limited construction conditions and solve the elevation differences and load limitations at the same time.

[0019] The device adopts an assembled structure and modular design, including prefabricated components such as bases, vertical walls and composite panels. These components can be standardized in the factory and then quickly assembled at the construction site. The setting of cavities inside the prefabricated components can greatly reduce their weight, making transportation and assembly operations more convenient, thereby not only improving construction efficiency but also ensuring the quality and stability of the structure.

[0020] The present invention forms a support base by distributing multiple groups of bases in a horizontal and vertical linear array. In the support base, the installation grooves correspond to each other to form horizontal grooves and vertical grooves. The vertical walls are adapted to be installed in the horizontal grooves and vertical grooves of adjacent bases, and together with the bases, form a solid lattice-shaped support system. This support system can effectively disperse the load and ensure the structural stability and safety of the entire device.

[0021] The composite slab is assembled on the top of each vertical wall to close the upper opening of the support system, thus forming an assembled cavity concrete replacement structure with a hollow interior. This structural system can not only effectively reduce the structural mass, but also further disperse the load, improving the seismic performance and service life of the structure.

[0022] Through experimental comparison with other solutions, the cavity structure of the present invention has good integrity, no wall overlap between cells, relatively light wall weight, low transportation cost, economical, green, low-carbon assembly, and can be quickly installed and disassembled, facilitating later maintenance and modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the assembly structure of the cavity structure and the integrated pipe gallery; Figure 2 This is a comparison chart of the difference in elevation between the new building and the integrated pipe gallery top; Figure 3 Schematic diagram of the connection structure of the cavity structure; Figure 4 is a schematic diagram of the structure of the base; Figure 5 Schematic diagram of the assembly structure for different types of vertical walls and bases; Figure 6 This is a schematic diagram of the assembly structure of the post-cast cross-shaped wall in Example 1; Figure 7 This is a schematic diagram of the reinforcement structure in the wall in Example 1; Figure 8 This is a schematic diagram of the construction of the support system in Example 1; Fig. 9 This is a schematic diagram of the wall assembly structure in Example 2; Fig.10 This is a schematic diagram of the assembly structure of the composite plate in Example 2; Fig.11 for Figure 1 A schematic diagram of the enlarged structure at A in the middle; Fig.12 It is a schematic diagram of the assembly structure of the vertical wall I and the composite plate in Example 3; Fig.13 There are two construction schemes for comparative examples 1 and 2; Figure (a) is the construction scheme for comparative example 1, and Figure (b) is the construction scheme for comparative example 2; Fig.14 The following is a comparison table of material usage and costs for Example 1 and Comparative Examples 1 and 2.

[0024] Figure numerals: 1-cavity structure, 2-original road surface, 3-capping platform, 4-steel column, 5-integrated pipe gallery, 6-support pile, 7-new ground building, 10-beam, 11-concrete cushion, 12-base, 121-bottom plate hook, 122-transverse groove, 123-longitudinal groove, 13-vertical wall I, 14-composite slab, 15-cavity area, 16-post-casting area I, 17-post-casting area II, 18-cast-in-place layer of composite slab, 19-hollow area, 20-vertical wall II, 21-hidden beam longitudinal reinforcement, 22-hidden column, 23-vertical wall hook, 24-hidden beam I, 25-longitudinal column reinforcement, 26-hidden beam stirrups, 27-hidden beam II, 28-column longitudinal reinforcement, 29-temporary pier, 30-post-cast cross wall, 31-cross hidden column, 32-large stirrups, 33-small stirrups, 34-tension bars, 35-protrusions, 36-positioning cones, 37-positioning grooves, 38-truss structure, 39-foam concrete. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 1, this embodiment aims to provide a prefabricated cavity concrete replacement device across the top of an underground municipal pipe gallery, which is used to complete the ground modification of a new building across existing municipal facilities under the premise of ensuring that the load above the comprehensive pipe gallery remains unchanged. The structural elevation of the comprehensive pipe gallery before the construction of the new building, the elevation of the road above the pipe gallery, and the elevation of the road after the construction of the new building are as follows: Figure 2 As shown, after the existing new buildings are completed, there is often a positive or negative difference between the initial ground elevation. Therefore, in order to solve the engineering technical problem of the difference in road elevation before and after construction when the load above the integrated pipe gallery is constant, this embodiment provides an assembled cavity concrete replacement device across the top of the underground municipal pipe gallery, such as Figure 1 As shown, under limited construction conditions, new buildings can be built across existing municipal facilities while solving the problems of elevation differences and load limitations.

[0026] The present embodiment provides an assembled cavity concrete replacement device across the top of an underground municipal pipe gallery, comprising a base, a vertical wall and a composite plate, wherein the vertical wall comprises prefabricated vertical wall I and vertical wall II of different lengths, and a plurality of groups of bases are distributed along transverse and longitudinal linear arrays to form a support foundation, in which installation grooves correspond to each other to form transverse grooves and longitudinal grooves, wherein the vertical wall I is adapted to be installed in the transverse groove of an adjacent base, and the vertical wall II is adapted to be installed in the longitudinal groove of an adjacent base, and each base forms a solid lattice-shaped support system with the surrounding vertical walls, and the composite plate is assembled on the top of each vertical wall to close the upper opening of the support system, thereby forming an assembled cavity concrete replacement structure with a hollow interior, and such a structural system can effectively disperse the load and ensure the structural stability and safety of the entire device.

[0027] In a specific structure, such as Figure 3 As shown, the base in this embodiment is a prefabricated reinforced concrete bottom plate foundation component with good bearing capacity. The top surface of the base is provided with installation grooves, which include transverse grooves 122 and longitudinal grooves 123. The transverse grooves and the longitudinal grooves intersect at the center of the base in a cross shape, thereby dividing a bottom plate into four identical sections. A bottom plate hook 121 is fixed in the middle of each base section for hoisting and connecting with the hoisting equipment to ensure uniform force during the hoisting process of the bottom plate.

[0028] like Figure 3 and Figure 4 As shown, the base is equipped with staggered transverse and longitudinal steel bars, and during actual on-site construction, the thickness and reinforcement specifications of the foundation slab are different according to the actual construction conditions, that is, when the thickness of the foundation slab is 250mm, the reinforcement is double-layer bidirectional φ12@200, and when the thickness of the foundation slab is 400mm, the reinforcement is double-layer bidirectional φ14@200, thereby ensuring that the construction is carried out in accordance with the corresponding reinforcement requirements under foundation slabs of different thicknesses.

[0029] A plain concrete cushion layer 11 is provided under the base plate. In this embodiment, the color number 100mm thick C20 plain concrete cushion layer is provided under the foundation base plate. The bases are distributed on the concrete cushion layer along the horizontal and vertical arrays, so that the horizontal grooves and the vertical grooves between adjacent bases correspond to each other, and criss-cross post-casting areas I16 are formed between adjacent whole bases. After the vertical walls above the bases are assembled, concrete is poured into the post-casting areas I, so that each vertical wall can be firmly erected on the base.

[0030] Furthermore, by laying a cushion layer under the base, a flat construction base surface is provided to ensure the installation accuracy of the base plate. Under the action of external load, the plain concrete cushion layer can provide a buffering effect, absorb part of the stress, reduce the direct impact on the tunnel structure, effectively disperse the load from the upper cavity support system, reduce the impact of uneven settlement on the lower soil layer, and improve the stability of the overall structure. At the same time, it can also indirectly play a certain anti-seepage role, prevent groundwater from eroding the upper structure, and extend the service life of the structure.

[0031] like Figure 3 and Figure 5 As shown, both the vertical wall I and the vertical wall II are reinforced concrete prefabricated wall panel components, and the height and width of the two are the same. The length of the vertical wall I is greater than that of the vertical wall II, and temporary piers 29 are symmetrically arranged on both sides of the bottom of the vertical wall I13 and the vertical wall II20. A vertical wall hook 23 is fixed in the center of the corresponding wall above the pier, which is used to be connected with the lifting equipment to ensure uniform force during the vertical wall lifting process. A hollow area 19 is respectively arranged in the middle of the two vertical walls. In this embodiment, the hollow area 19 is a rectangular hole structure, which can effectively reduce the mass of the wall without affecting the bearing capacity of the overall structure.

[0032] Furthermore, if Figure 5 and Figure 7 As shown, during construction, the vertical wall I13 spans over two adjacent bases 12, and is vertically installed in the horizontal groove 122 of the adjacent bases through the temporary piers at the bottom of the vertical wall I and the bent steel bars in the wall, so as to ensure the stability of the vertical wall before pouring concrete. The vertical wall II20 spans over two adjacent bases, and is vertically installed in the longitudinal groove 123 of the adjacent bases through the temporary piers at the bottom of the vertical wall II and the bent steel bars in the wall, and a gap is left between the lower side wall of each vertical wall and the groove wall of the installation groove on the base, forming a cross-shaped post-casting area II17. After the construction of the vertical wall is completed, concrete is poured into the post-casting area II17, and the height of the concrete is flush with the height of the installation groove on the base, so that each vertical wall is vertically fixed on the base, ensuring the stable connection of the vertical wall, forming a lattice-shaped support system.

[0033] like Figure 6 and Figure 8As shown, the ends of each horizontally arranged vertical wall I and the vertically arranged vertical wall II form a cross-shaped area with the center of the installation groove on the base, and the area is formed into a cross-shaped hidden column 31 by steel bar binding. After the construction of the surrounding vertical walls is completed, concrete is poured into the cross-shaped hidden column to form a post-cast cross-shaped wall 30. As an internal support structure, the cross-shaped hidden column provides an efficient connection node for the entire support system, which can effectively enhance the strength and stability of the intersection and ensure the close connection between the vertical walls; in addition, the post-cast cross-shaped wall helps to optimize the distribution of stress in the structure and reduce stress concentration, thereby effectively improving the shear resistance of the entire support system and improving the seismic performance and service life of the structure.

[0034] like Figure 3 and Fig.10 As shown, a composite plate 14 is set on the top of the vertical wall, and a cast-in-place layer 18 of the composite plate is formed above the composite plate, so as to add a top cover to the top of the lattice support system constructed above. Furthermore, the left and right sides of the composite plate are respectively arranged on the top of the vertical wall II, and the front and rear sides are respectively arranged on the top of the vertical wall I. After the overlapping of the composite plate is completed, a cross-shaped casting joint is formed with the top surface of the post-cast cross wall. By pouring concrete into the cast-in-place layer of the composite plate on the top surface of the composite plate, the casting joint can be filled, and at the same time, the upper part of the above support system is closed to form a solid overall structure.

[0035] The assembled cavity concrete replacement device across the top of the underground municipal pipeline corridor provided in this embodiment allows flexible adjustment according to actual construction conditions and is suitable for a variety of construction environments and needs. It can ensure that new buildings can smoothly cross existing municipal facilities while meeting load requirements and ensuring structural safety and stability, providing an effective solution for new buildings to cross existing municipal facilities.

[0036] Embodiment 2: Based on Embodiment 1, this embodiment further illustrates the installation structure of the vertical wall I and the vertical wall II.

[0037] like Figure 7 As shown in FIG. 1 and FIG. 2 , the middle of the vertical wall I and the vertical wall II are respectively provided with hollow holes, and the wall reinforcement around the hole includes hidden beam longitudinal reinforcement 21, hidden column 22, hidden beam I 24, longitudinal column reinforcement 25, hidden beam stirrup 26, hidden beam II 27 and column longitudinal reinforcement 28, etc., and the standard components of the vertical wall I and the vertical wall II are prefabricated by the existing steel bar binding method. This embodiment is further described by taking the vertical wall 1 as an example. Figure 3 and Fig.11 As shown, a protruding structure 35 is formed upward at the middle of the top of the vertical wall 1, and the two sides of the protrusion are used for overlapping and assembling with the composite slab. After the cast-in-place layer of the composite slab is poured with concrete, the forming plane is flush with the top of the protrusion to form a flat structure.

[0038] In this embodiment, the reinforcement in the vertical wall includes a variety of steel bar configurations such as hidden beam longitudinal bars, hidden columns, hidden beams and stirrups, which enhances the overall bearing capacity and shear strength of the structure, ensures stability under load, and the multi-directional reinforcement design can effectively disperse external loads and earthquake effects, and improve overall earthquake resistance. In addition, the prefabrication of vertical walls I and II allows for rapid assembly, making the construction process more efficient, reducing the complexity and risk of on-site construction, shortening the construction period, and improving the safety and efficiency of construction.

[0039] Embodiment 3, based on embodiments 1 and 2, this embodiment provides a positioning structure for enabling rapid installation of composite panels during installation, thereby reducing the complexity of manual positioning operations.

[0040] like Fig.12 As shown, each vertical wall is a prefabricated standard component structure. The positioning structure includes a positioning cone 36 installed on the top of the vertical wall and a positioning groove 37 arranged at the bottom of the composite board. The positioning cones are symmetrically arranged on both sides of the protruding structure. 2-4 groups can be arranged on the top of the vertical wall I, and 1-2 groups can be arranged on the top of the vertical wall II. When the composite board is hoisted above the vertical wall, the positioning groove on the composite board can be matched with the positioning cone on the vertical wall by slightly swinging the position of the composite board, so that the composite board is placed at the preset position.

[0041] This embodiment can achieve fast and accurate docking by setting a positioning cone at the top of the vertical wall and a corresponding positioning groove at the bottom of the composite plate, which greatly reduces the manual positioning time during the assembly of the composite plate, enables it to be quickly aligned and matched with the positioning cone, and improves construction efficiency and safety.

[0042] Example 4, based on Examples 1-3, this example provides a method for replacing the construction of assembled cavity concrete across the top of an underground municipal pipe gallery, specifically comprising the following steps: Step 1: After the construction of the supporting piles 6, the cap 3, the beams 10 and the steel concrete columns 4 around the integrated pipe gallery is completed, the upper structure of the integrated pipe gallery, i.e., the cavity structure 1, is constructed; Step 2: Excavation of foundation pit; cleaning the construction site, including vegetation cleaning and topsoil excavation, and then measuring and setting out to determine the location of the excavation line of the foundation pit of the integrated pipe gallery, excavating the foundation pit, and ensuring that there is no water accumulation in the foundation pit; the foundation of the cavity structure is the backfill soil above the integrated pipe gallery, so that the cavity structure is replaced with the original cover soil with equal dead load; Step 3: Construction of the base; a 100mm thick C20 plain concrete cushion is laid at the bottom of the foundation pit, and the prefabricated reinforced concrete floor slab foundation components (bases) are installed on the concrete cushion in a horizontal and vertical linear array distribution, ensuring that the installation grooves correspond to each other to form horizontal and vertical grooves, so that a post-casting area I is formed between adjacent bases, and concrete is poured in the criss-crossing post-casting area I formed between adjacent bases to form a stable connection between the bases; Step 4: Construction of cross-shaped hidden columns: According to the requirements of the drawings, accurately lay out the position line of the cross-shaped hidden columns at the construction site (on the base), tie the main reinforcement and stirrups to form a stable reinforcement skeleton to prevent displacement during concrete pouring; Step 5: Vertical wall installation: Use hoisting equipment to hoist the prefabricated reinforced concrete wall panel components (vertical wall I and vertical wall II) into place, install them vertically in the installation groove of the base through temporary piers and bent steel bars in the wall, and pour concrete in the post-casting area II to fix the vertical wall vertically on the base; Step 6: Casting of post-cast cross-shaped walls; Cast concrete for the cross-shaped hidden columns formed in the middle of each base plate, so that the surrounding side walls are flush with the vertical walls, and the top is flush with the top of each vertical wall; after the post-cast area is fully cast, multiple evenly arranged grid unit modules have been formed to form a grid-like support system; Step 7: Installation and pouring of the superimposed slab; hoist the superimposed slab above the grid unit module, and the operator uses the positioning structure on the superimposed slab and the vertical wall to achieve precise docking and laying of the superimposed slab and the vertical wall; then pour concrete into the cast-in-place layer of the superimposed slab on the top surface of the superimposed slab to fill the pouring seam and complete the closure of the upper part of the support system.

[0043] Comparative Example 1: Fig.13 As shown in (a), this comparison provides a steel concrete truss construction plan, that is, after the construction of the new building is completed, a steel concrete truss structure 38 is erected above the integrated pipeline corridor, wherein the steel concrete truss has a span of 40.500m and a center height of the upper and lower chords of 2.5m, so as to achieve the span of the new building over the existing municipal facilities and solve the difference in road elevation before and after construction.

[0044] Comparative Example 2: Fig.13 As shown in (b), this comparative example provides a foam concrete backfilling solution, that is, after the construction of the new building is completed, the foam concrete 39 is backfilled above the integrated pipe gallery to achieve the span of the new building over the existing municipal facilities, while solving the difference in road elevation before and after construction.

[0045] See also Fig.14, the actual experiment comparison of Example 1, Comparative Example 1 and Comparative Example 2 was conducted, and it was found that although the truss spanning construction scheme of Comparative Example 1 has little impact on the built comprehensive pipe gallery, the steel concrete truss is difficult to construct, has a long period of time, and is costly; and the foam concrete scheme of Comparative Example 2 is convenient to construct and has a lower cost than the truss structure, but the foam concrete absorbs water, resulting in a change in bulk density, and the backfill volume is large, and the insufficient strength of the foam concrete also leads to the addition of a truss structure during actual construction, which increases the difficulty of construction. While the cavity structure scheme in this embodiment has good structural integrity, is economical, green, low-carbon in assembly, and low in cost, and can be quickly installed and disassembled, facilitating later maintenance and transformation, while solving the elevation difference and load limitation.

[0046] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. The basic concept of the present invention is to use a prefabricated cavity structure under limited construction conditions to achieve the span of new buildings and fill the road elevation difference, while achieving equivalent replacement of the constant load above the integrated pipe gallery to protect the integrated pipe gallery structure. 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 claims of the present invention.

Claims

1. An assembled cavity concrete replacement device across the top of an underground municipal pipe gallery, characterized in that: A replacement pit is excavated downward from the soil cover above the pipe gallery, and a cavity structure is paved in the replacement pit. The cavity structure includes a base, a vertical wall I, a vertical wall II and a composite plate, and a cross-shaped installation groove is provided on the base; A plurality of groups of bases are distributed in a linear array to form a support foundation, in which the installation grooves correspond to each other to form transverse grooves and longitudinal grooves; the vertical walls are adapted to be installed in the transverse grooves and longitudinal grooves to form a lattice-shaped support system; the composite plates are assembled on the vertical walls to close the upper part of the support system.

2. The assembled cavity concrete replacement device across the top of the underground municipal pipe gallery according to claim 1 is characterized in that: The base is distributed along a horizontal and vertical linear array to form a supporting foundation. The top surface of the base is provided with mounting grooves, which include horizontal grooves and vertical grooves. The horizontal grooves and the vertical grooves intersect at the center of the base in a cross shape, thereby dividing a base into four identical sections. A bottom plate hook is fixed in the middle of each base section.

3. The assembled cavity concrete replacement device across the top of the underground municipal pipe gallery according to claim 2 is characterized in that: A plain concrete cushion layer is arranged under the base, and the base is distributed on the concrete cushion layer along a transverse and longitudinal array, so that the transverse grooves and the longitudinal grooves between adjacent bases correspond to each other, and a criss-cross post-casting area I is formed between adjacent whole bases.

4. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 1 is characterized in that: The vertical wall I and the vertical wall II are both prefabricated reinforced concrete wall panel components, and the height and width of the two are the same, and the length of the vertical wall I is greater than that of the vertical wall II.

5. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 4 is characterized in that: Temporary piers are symmetrically arranged on both sides of the bottom of the vertical wall I and the vertical wall II, and a vertical wall hook is fixed in the center of the corresponding wall above the piers, and a hollow area is arranged in the middle of each vertical wall.

6. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 5 is characterized in that: The vertical wall I spans over two adjacent bases and is vertically installed in the horizontal grooves of the adjacent bases through temporary piers at the bottom of the vertical wall I and the bent steel bars in the wall; the vertical wall II spans over two adjacent bases and is vertically installed in the longitudinal grooves of the adjacent bases through temporary piers at the bottom of the vertical wall II and the bent steel bars in the wall.

7. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 6 is characterized in that: A gap is left between the side wall below each vertical wall and the groove wall of the installation groove on the base to form a cross-shaped post-casting area.

8. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 7 is characterized in that: The ends of the transversely arranged vertical wall I and the longitudinally arranged vertical wall II form a cross-shaped area with the center of the installation groove on the base. The area is formed into a cross-shaped hidden column by tying steel bars, and concrete is poured into the cross-shaped hidden column to form a post-cast cross-shaped wall.

9. The assembled cavity concrete replacement device across the top of an underground municipal pipe gallery according to claim 8 is characterized in that: A protruding structure is formed upwardly at the middle of the top of the vertical wall I and the vertical wall II, and two sides of the protrusion are used for assembly with the composite plate.

10. A construction method for replacing the assembled cavity concrete on the top of an underground municipal pipe gallery, using the assembled cavity concrete replacement device on the top of an underground municipal pipe gallery as described in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Bottom plate construction: first lay a layer of C20 plain concrete cushion on the top soil of the pipe gallery, install the base on the concrete cushion in a horizontal and vertical linear array distribution, ensure that the installation grooves correspond to each other, form horizontal grooves and vertical grooves, form a post-casting area I between adjacent bases, and pour concrete in the criss-cross post-casting area I formed between adjacent bases; Step 2: Construction of cross-shaped hidden columns: accurately lay out the position line of the cross-shaped hidden columns on the base, tie the main reinforcement and stirrups to form a stable reinforcement skeleton; Step 3: vertical wall construction; hoist and assemble vertical wall I in the horizontal direction to the center of the horizontal groove on the adjacent bottom plate, and hoist and assemble vertical wall II in the vertical direction to the center of the longitudinal groove on the adjacent bottom plate, use temporary piers at the bottom of each vertical wall to provide support, pour concrete in the post-casting area II, and fix the vertical wall vertically on the base; Step 4: Post-cast cross-shaped wall casting: Concrete is poured on the cross-shaped hidden columns formed in the middle of each bottom plate, so that the side walls around it are flush with the vertical walls, and the top is flush with the top of each vertical wall, thereby forming a plurality of evenly arranged grid unit modules to form a grid-like support system; Step 5: Installation and pouring of the composite slab; hoist the composite slab above the grid unit module to achieve precise docking and laying of the composite slab and the vertical wall; then pour concrete into the cast-in-place layer of the composite slab on the top surface of the composite slab to complete the closure of the upper part of the support system.

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