Underground frame structure and construction method thereof

Abstract

The present invention relates to a construction method for an underground frame structure, comprising the following steps: construction preparation; construction of a retaining support system; excavation of a basin-shaped area; construction of a pile foundation cap; construction of a water collection well; construction of a foundation base plate and supporting columns; construction of a base plate chamfer; construction of a side wall single-sided formwork system; construction of a deformable and adjustable concrete horizontal support; excavation of a counter-pressure area; construction of a second steel support; construction of a sloped base plate; and construction of an independent formwork system for post-cast strips. The present invention employs a deformable and adjustable concrete horizontal support, a base plate chamfer formwork installation and stabilization system, and an independent formwork system for post-cast strips, and is suitable for the construction of large-scale construction projects with a relatively deep depth and a large area, thereby improving construction efficiency and shortening construction period. Furthermore, the present invention can effectively control the stability of the slope and the back pressure of the retained soil, thereby ensuring safety and stability during foundation pit construction, and has broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of civil engineering, and in particular relates to a construction method for an underground frame structure. The method is suitable for the construction of underground frame structures, and is particularly suitable for the construction of large-scale building projects with a relatively deep depth and a large area. Background Art

[0002] In urban construction, with the accelerated pace of urbanization, an increasing number of high-rise buildings, underground garages, and other structures need to be built. The country continues to increase its investment in infrastructure, resulting in a shortage of land for surface construction within cities and an ever-expanding demand for underground space. The construction of these buildings requires foundation pit excavation and support. The basin excavation system is a commonly used foundation pit support system that effectively controls slope stability and retained soil counterpressure, ensuring safety and stability during foundation pit construction.

[0003] The main underground structure of a basin-type excavation pit consists of a slope support system, an underground diaphragm wall, and a pit floor. The slope support system primarily supports the slope to prevent collapse and other accidents. The underground diaphragm wall stabilizes the soil and ensures the stability of the pit. The pit floor is a horizontal structure located below the underground diaphragm wall. Reinforcement and thickening can be used to improve the pit's stability and bearing capacity. The main underground structure of a basin-type excavation pit is characterized by its simple structure, high construction efficiency, and excellent stability.

[0004] The construction methods of the underground main structure of the basin-type excavation foundation pit mainly include slope support, underground continuous wall construction and foundation pit bottom slab construction. Slope support can adopt support systems such as piles and anchor rods to ensure the stability of the slope. Underground continuous walls can adopt structures such as reinforced concrete continuous walls or precast concrete slab walls to fix the soil and ensure the stability of the foundation pit. The foundation pit bottom slab can be in the form of concrete pouring or precast concrete slabs, and the stability and bearing capacity of the foundation pit can be improved through measures such as reinforcement and thickening. During the construction process, it is also necessary to consider surrounding environmental factors and safety measures to ensure the safety and stability of the construction.

[0005] Therefore, how to achieve safe construction of underground frame structures is of vital importance. It is the key system of on-site construction and the key and difficult point of the entire construction. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for an underground frame structure.

[0007] The construction method of the underground frame structure comprises the following steps:

[0008] Step 1: Construct the underground continuous wall, engineering piles, retaining piles and lattice columns, and carry out the first deformable adjustable concrete horizontal support construction. Use basin excavation at the foundation bottom plate, and excavate the two-level slope center island inside the underground continuous wall;

[0009] Step 2: Assemble the prefabricated foundation cap membrane on the top of the engineering pile and cast the pile foundation cap; install the adjustable water collection well hole template and support it with a recyclable internal support frame, and then cast the water collection well;

[0010] Step 3: Construct the foundation slab and support columns in sequence;

[0011] Step 4: Install the bottom plate chamfer formwork through the bottom plate chamfer formwork installation and stabilization system, and cast the bottom plate chamfer; construct the side wall through the side wall single-sided formwork system;

[0012] Step 5: Connect the deformable and adjustable concrete horizontal support to the top plate of the central island main structure, and set a sliding connector on the side of the end of the deformable and adjustable concrete horizontal support;

[0013] Step 6: Excavate the counter-pressure area and construct the second steel support, then excavate the counter-pressure soil and construct the foundation slab, reserve the post-casting strip through the independent formwork system and pour it.

[0014] Preferably, in step one: a crown beam is provided on the top of the underground continuous wall, and a waist beam is provided in the middle of the underground continuous wall; the circumferential stirrups of the structural top plate and the longitudinal main reinforcement of the structural top plate are first tied, the lattice columns are arranged on the top of the bottom plate of the main structure of the center island, and the top of the lattice columns of each layer are provided with a supporting plate, and the middle plate of the main structure of the center island and the top plate of the main structure of the center island are arranged on the supporting plate; the soil in the middle of the foundation pit at the bottom plate of the foundation is excavated in a basin-like manner, and the soil on the inner side of the underground continuous wall is sloped in two levels, and counter-pressure soil is reserved to complete the excavation of the soil of the center island.

[0015] Preferably, in step 2: the prefabricated foundation membrane skeleton structure is formed by assembling a transverse long template, a longitudinal long template, a longitudinal short template, a transverse short template and a longitudinal middle template;

[0016] The steel cage of the water collection well is tied, and an adjustable water collection well hole formwork system is installed at the water collection well according to the design drawings, and then the water collection well is poured. Specifically, a recyclable inner support frame is formed by assembling an upper cross beam, a lower cross beam and a vertical connecting rod. A lifting ring is provided on the top of the water collection well hole formwork, and the lifting ring is connected to a steel wire rope. Then, a crane is used to install the water collection well hole formwork at the water collection well where pouring is required, and the recyclable inner support frame is installed in the water collection well hole formwork;

[0017] In step 2, vertical embedded screws, oblique embedded screws and embedded U-shaped straight threaded steel bars are set on the top of the foundation slab.

[0018] As a preferred method, in step 4: first tie the steel cage at the bottom plate chamfer, then install the bottom plate chamfer template to stabilize the system, then cast the bottom plate chamfer, and set the embedded straight threaded steel bar at the top of the bottom plate chamfer.

[0019] The base plate chamfer template installation and stabilization system includes a weighted ladder frame, a vertical support system, vertical embedded screws and oblique embedded screws; the vertical support system supports the weighted ladder frame, the top of the vertical support system is provided with a top support plate, and the bottom of the vertical support system is provided with a bottom support plate; the side of the weighted ladder frame is provided with a weighted ladder frame side plate, the bottom of the weighted ladder frame is provided with a weighted ladder frame pressure plate, and a jack is provided below the upper end of the weighted ladder frame pressure plate; the vertical embedded screws and oblique embedded screws are embedded in the top of the foundation base plate, the vertical embedded screws pass through one end of the bottom support plate, and are fixed with a top pressure beam; the oblique embedded screws pass through the base plate chamfer template and the lower end of the weighted ladder frame pressure plate, and are pressed and fixed with an oblique pressure beam.

[0020] Preferably, in step four: specifically, install the base plate chamfer template on the side of the base plate chamfer, install a weighted ladder frame on the top of the base plate chamfer template, and use oblique embedded screws to fix the base plate chamfer template and one end of the weighted ladder frame; install a vertical support system below the side of the weighted ladder frame, adjust the jack so that the support plate of the telescopic rod is supported on the wall; use vertical embedded screws to fix one end of the bottom support plate of the vertical support system, and install a vertical support rod at the other end of the bottom support plate; set embedded straight threaded steel bars at the top of the base plate chamfer.

[0021] Preferably, in step four: the side wall single-sided formwork system includes a bottom tie system, rear adjustment legs, front adjustment legs, embedded straight threaded steel, external connecting rods and side wall steel formwork; the side wall steel formwork is provided with a tripod system, the tripod system includes a cantilever platform, a standard section tripod and a heightened section tripod, the standard section tripod and the heightened section tripod are connected at the joint with bolts, and the cantilever platform is provided on the top side of the standard section tripod; the side of the side wall steel formwork is provided with grooved vertical ribs and grooved main ribs, and the grooved main ribs are connected to the standard section tripod and the heightened section tripod with formwork fasteners; the cantilever platform, the standard section tripod and the heightened section tripod are used to form a tripod system, the side wall steel formwork is connected to the tripod system with formwork fasteners, and the side wall single-sided formwork system is fixed with embedded straight threaded steel and embedded U-shaped straight threaded steel.

[0022] Preferably, in step five: the deformable and adjustable concrete horizontal support is connected to the top plate of the main structure of the center island, and the deformable and adjustable concrete horizontal support includes the longitudinal main reinforcement of the concrete support and the circumferential stirrups of the concrete support; the longitudinal main reinforcement of the concrete support and the circumferential stirrups of the concrete support are first tied, and the longitudinal main reinforcement of the concrete support and the longitudinal main reinforcement of the structural top plate are connected by connecting reinforcement; the sliding connector is fixed by embedded bolts on the side of the end of the deformable and adjustable concrete horizontal support, and a support column is set below the deformable and adjustable concrete horizontal support.

[0023] As a preferred embodiment, in step six: unloading the counter-pressure soil to the bottom of the second steel support, constructing the second steel support, and after the second steel support forms strength, unloading the counter-pressure soil to the design elevation of the foundation bottom plate; both ends of the second steel support are respectively connected to the waist beam, and there is a support column under the second steel support;

[0024] A foundation slab with a slope is a sloped slab. When constructing a foundation slab with a slope, a large-slope support slope adjustment system is first set up. The large-slope support slope adjustment system includes a unit slope adjustment support. The unit slope adjustment support includes a vertical steel pipe and a horizontal steel pipe. The top of the vertical steel pipe is provided with a top adjustment support plate, the bottom is provided with a bottom adjustment pad, and the top of the top adjustment support plate is provided with a sloped slab template. Specifically, the vertical steel pipe and the horizontal steel pipe are assembled into a unit slope adjustment support, and the slope is adjusted by the bottom adjustment pad and the top adjustment support plate.

[0025] Preferably, in step six: when constructing the foundation bottom plate, it is necessary to reserve a post-casting strip, which is achieved by an independent formwork system for the post-casting strip, the independent formwork system for the post-casting strip includes a steel-steel plate combined post-casting strip temporary sealing device, a post-casting strip formwork system and a top plate bottom formwork, the steel-steel plate combined post-casting strip temporary sealing device includes a steel plate, a steel section, a connecting screw and a transverse rod, the steel plate is supported between the structural top plates on both sides of the post-casting strip, the steel section and the transverse rod are supported between the steel plates, the gap between the steel section and the steel plate is filled with a pressing plate, a steel section is provided on the top of the connecting screw, and the post-casting strip formwork system is supported at the bottom of the top plate bottom formwork;

[0026] Specifically, first use plates, steel sections, connecting screws, and transverse rods to assemble a steel-steel plate combination post-casting joint temporary closing device, and then install the steel-steel plate combination post-casting joint temporary closing device at the reserved post-casting joint; after the foundation slab is constructed, remove the steel-steel plate combination post-casting joint temporary closing device, and then cast the post-casting joint. Specifically, first remove the pressure plate, and then remove the connecting screws and transverse rods.

[0027] An underground frame structure obtained by any of the above methods.

[0028] The beneficial effects of the present invention are:

[0029] 1) The present invention adopts deformable and adjustable concrete horizontal support, and the concrete support and the center island top plate are connected with deformable and adjustable connectors. The deformation can be adjusted by the deformation control member, the structure is safe, and the deformation of the foundation pit bottom plate is reduced.

[0030] 2) The present invention adopts a base plate chamfer template installation stabilization system and utilizes an anchor tension-compression combination method to realize the support of the template, thereby solving the construction problem of the base plate chamfer template and effectively ensuring the quality of structural construction.

[0031] 3) The independent formwork system for the post-casting strip involved in the present invention adopts a temporary sealing device for the post-casting strip combined with a steel section and a steel plate, which effectively ensures the construction quality of the post-casting strip and has significant economic benefits.

[0032] 4) The present invention adopts an adjustable water collection well opening template system and an internal support frame recyclable template, which has a simple structure and high template turnover efficiency, greatly improving construction efficiency.

[0033] 5) The present invention adopts a single-sided formwork system for the side wall and uses a tripod to reinforce the steel formwork, which ensures the safe construction of the formwork, effectively ensures the casting quality of the side wall, and effectively reduces water seepage in the basement.

[0034] 6) The present invention adopts a large-slope support slope adjustment system, using the top and bottom support plates of the steel pipe support to adjust the slope, which is convenient for construction and greatly improves construction efficiency.

[0035] 7) The present invention adopts a prefabricated foundation diaphragm construction system and an external quick-connect component to achieve rapid splicing of the prefabricated foundation diaphragm, thereby ensuring construction quality and high construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the connection between the concrete support and the center island top plate;

[0037] Figure 2 It is the underground frame structure and construction diagram;

[0038] Figure 3 is the elevation view of the sliding connection;

[0039] Figure 4 This is a detailed structural drawing of the top plate connector;

[0040] Figure 5 is a three-dimensional schematic diagram of a sliding connection;

[0041] Figure 6 This is a schematic diagram of the base plate chamfer template installation and stabilization system;

[0042] Figure 7 It is a detailed structural diagram of the stable system;

[0043] Figure 8 This is a schematic diagram of the side wall single-sided formwork system;

[0044] Figure 9 This is the detailed structural drawing of the bottom embedded parts;

[0045] Figure 10 This is the detailed structural drawing of the embedded parts at the chamfer;

[0046] Figure 11 It is a schematic diagram of the tripod steel template;

[0047] Figure 12 This is a schematic diagram of the slope adjustment construction of a large-slope support;

[0048] Figure 13 This is a construction diagram of the adjustable water collection well opening formwork system;

[0049] Figure 14 This is the structural diagram of the recyclable formwork with internal support frame;

[0050] Figure 15 This is a construction diagram of the independent formwork system for the post-casting zone;

[0051] Figure 16 This is a structural diagram of the temporary sealing device for the post-cast strip of the steel section-steel plate combination;

[0052] Figure 17 It is a three-dimensional image of the prefabricated foundation membrane;

[0053] Figure 18 It is a plan view of the prefabricated foundation membrane;

[0054] Figure 19 It is a three-dimensional diagram of the assembly of the prefabricated foundation membrane;

[0055] Figure 20 It is a three-dimensional diagram of the assembly of the prefabricated foundation membrane;

[0056] Figure 21 is a plan view of a sliding connection;

[0057] Figure 22 It is a three-dimensional diagram of the extrafetal membrane connection;

[0058] Figure 23 It is a three-dimensional diagram of the intrafetal membrane connector.

[0059] In the figure: 1-structure top plate, 2-underground continuous wall, 3-engineering piles, 4-foundation bottom plate, 5-water collection well, 6-guard piles, 7-center island main structure top plate, 8-lattice column, 9-second steel support, 10-deformable adjustable concrete horizontal support, 11-embedded steel plate, 12-center island main structure bottom plate, 13-center island main structure middle plate, 14-crown beam, 15-waist beam, 16-concrete support longitudinal main reinforcement, 17-concrete support circumferential stirrups, 18-connecting reinforcement, 19-support column, 20-embedded bolts, 21-nuts, 22-sliding connector, 23-structure top plate circumferential stirrups, 24-structure top plate longitudinal main reinforcement, 25-support plate, 26 - reserved holes, 27- sliding grooves, 28- sliding springs, 29- jacks, 30- telescopic rods, 31- weighted ladder frame pressure plates, 32- weighted ladder frames, 33- weighted ladder frame side plates, 34- top support plates, 35- top pressure beams, 36- vertical support systems, 37- bottom support plates, 38- vertical support rods, 39- vertical embedded screws, 40- oblique embedded screws, 41- bottom plate chamfer templates, 42- bottom plate chamfer corners, 43- support plates, 44- side walls, 45- oblique pressure beams, 46- cantilever platforms, 47- standard section tripods, 48- bolts, 49- heightened section tripods, 50- bottom tie systems, 51- rear adjustment legs, 52- H-shaped steel , 53-front adjustment leg, 54-embedded straight threaded steel, 55-connecting nut, 56-pressure beam, 57-casting gasket, 58-butterfly nut, 59-external connecting rod, 60-formwork fastener, 61-side wall steel formwork, 62-grooved vertical rib, 63-grooved main rib, 64-embedded U-shaped straight threaded steel, 65-connecting steel, 66-vertical pressure beam, 67-gasket, 68-pressed butterfly nut, 69-connecting rod, 70-water collection well hole formwork, 71-lifting ring, 72-upper cross beam, 73-lower cross beam, 74-vertical connecting rod, 75-pressure plate, 76-steel plate, 77-section steel, 78-connecting screw, 79-fixing bolt, 80-fixing nut, 81-post-casting strip formwork Frame system, 82-horizontal rod, 83-top plate bottom formwork, 84-sloped bottom plate, 85-unit slope adjustment bracket, 86-vertical steel pipe, 87-bottom adjustment pad, 88-slope bottom plate formwork, 89-top adjustment support plate, 90-horizontal long formwork, 91-longitudinal long formwork, 92-prefabricated pedestal membrane, 93-fixing screws, 94-external connecting parts, 95-longitudinal short formwork, 96-screws, 97-horizontal short formwork, 98-longitudinal middle formwork, 99-internal connecting parts, 100-connecting part reserved holes, 101-pile foundation pedestal, 102-bottom base, 103-lower nut, 104-upper nut, 105-independent formwork system for post-casting strip, 106-tripod base. DETAILED DESCRIPTION

[0060] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0061] Example 1

[0062] As an embodiment, the construction method of the underground frame structure includes the following steps:

[0063] Step 1. Construction Preparation: Customize the embedded steel plates 11, sliding connectors 22, standard section tripods 47, heightened section tripods 49, side wall steel formwork 61, and the temporary closure device for the post-cast strips of the steel section 77-steel plate 76 combination in advance at the factory. Simultaneously, make the weighted ladder frame 32, bottom plate chamfer formwork 41, adjustable water collection well opening formwork 70, and prefabricated foundation diaphragm 92.

[0064] Construction of the retaining support system: First, the underground continuous wall 2, engineering piles 3, retaining piles 6, and lattice columns 8 of the large foundation pit are constructed. Simultaneously, the first deformable and adjustable concrete horizontal support 10 is constructed. A crown beam 14 is installed at the top of the underground continuous wall 2, and a waist beam 15 is installed in the middle of the underground continuous wall 2. First, the structural top plate annular stirrups 23 and the structural top plate longitudinal main reinforcement 24 are tied. The lattice columns 8 are installed on top of the center island main structure bottom plate 12. A supporting plate 25 is installed on top of the lattice columns 8 on each floor. The center island main structure middle plate 13 and the center island main structure top plate 7 are installed on the supporting plate 25.

[0065] Basin-type area excavation: The soil in the middle of the foundation pit at the foundation bottom plate 4 is excavated in a basin-type manner. The soil inside the underground continuous wall 2 is sloped in two levels, and counter-pressure soil is reserved to complete the excavation of the central island soil.

[0066] Step 2, pile foundation cap construction: first, tie the steel cage of the pile foundation cap 101, then assemble the prefabricated cap membrane 92 at the pile foundation cap 101 on top of the engineering pile 3, and then cast the pile foundation cap 101. Specifically, use the horizontal long formwork 90, the vertical long formwork 91, the vertical short formwork 95, the horizontal short formwork 97, and the vertical middle formwork 98 to assemble the prefabricated cap membrane 92 skeleton structure;

[0067] Water collection well construction: First, tie the steel cage of the water collection well 5, then install the adjustable water collection well hole template 70 system at the water collection well 5 according to the design drawings, and then cast the water collection well 5. Specifically, use the upper cross beam 72, the lower cross beam 73 and the vertical connecting rod 74 to assemble a recyclable inner support frame, connect the lifting ring 71 with the wire rope, and then use a crane to install the water collection well hole template 70 at the water collection well 5 where casting is required, and install the recyclable inner support frame inside the water collection well hole template 70;

[0068] Step 3: Construction of foundation slab and supporting columns: First, tie the reinforcement cages of foundation slab 4 and supporting columns 19. First, construct foundation slab 4, then construct supporting columns 19, and set vertical embedded screws 39, oblique embedded screws 40 and embedded U-shaped straight threaded steel bars 64 on top of foundation slab 4.

[0069] Step 4, bottom plate chamfer construction: first tie the steel cage at the bottom plate chamfer 42, then install the bottom plate chamfer formwork 41 to stabilize the system, then cast the bottom plate chamfer 42, and set the embedded straight threaded steel 54 on the top of the bottom plate chamfer 42. Specifically, install the bottom plate chamfer formwork 41 on the side of the bottom plate chamfer 42, install the weighted ladder frame 32 on the top of the bottom plate chamfer formwork 41, and use the oblique embedded screws 40 to fix the bottom plate chamfer formwork 41 and one end of the weighted ladder frame 32; install the vertical support system 36 below the side of the weighted ladder frame 32, adjust the jack 29 so that the support plate 43 of the telescopic rod 30 is supported on the wall; use the vertical embedded screws 39 to fix one end of the bottom support plate 37 of the vertical support system 36, and at the same time install the vertical support rod 38 on the other end of the bottom support plate 37;

[0070] Construction of the side wall single-sided formwork system: First, tie the steel cage at the side wall 44, then construct the side wall 44 single-sided formwork system, and then cast the side wall 44. Specifically, use the cantilever platform 46, the standard section tripod 47, and the heightened section tripod 49 to form a tripod system. Use formwork fasteners 60 to connect the side wall steel formwork 61 to the tripod system. Use pre-buried straight threaded steel bars 54 and pre-buried U-shaped straight threaded steel bars 64 to fix the side wall 44 single-sided formwork system.

[0071] Step 5, construction of deformable adjustable concrete horizontal support: After the main structure of the center island is completed, the deformable adjustable concrete horizontal support 10 on the counter-pressure soil is connected to the top plate 7 of the center island main structure. First, the longitudinal main reinforcement 16 of the concrete support and the circumferential stirrups 17 of the concrete support are tied. The longitudinal main reinforcement 16 of the concrete support and the longitudinal main reinforcement 24 of the structure top plate are connected by connecting reinforcement 18; embedded bolts 20 are set on the side of the end of the deformable adjustable concrete horizontal support 10, and the sliding connector 22 and the embedded bolts 20 are connected and fixed. A support column 19 is provided below the deformable adjustable concrete horizontal support 10;

[0072] Step 6: Excavation of the counter-pressure area: Excavate the soil in the counter-pressure area to the bottom of the second steel support 9, construct the second steel support 9, and after the second steel support 9 is strengthened, the counter-pressure soil can be excavated to the base elevation, and the construction of the main structure of the counter-pressure area can begin;

[0073] Construction of the second steel support: unload the counter-pressure soil to the bottom of the second steel support 9, construct the second steel support 9, and after the second steel support 9 has formed strength, unload the counter-pressure soil to the design elevation of the foundation pit; the two ends of the second steel support 9 are respectively connected to the waist beam 15, and there is a support column 19 under the second steel support 9;

[0074] Slope base plate construction: When constructing a sloped foundation base plate 4, first set up a large-slope support slope adjustment system. Specifically, use vertical steel pipes 86 and horizontal steel pipes to assemble a unit slope adjustment support 85, and adjust the slope through the bottom adjustment pad 87 and the top adjustment support plate 89;

[0075] Construction of an independent formwork system for post-casting strips: When constructing the foundation slab 4, it is necessary to reserve a post-casting strip, which is achieved through the independent formwork system 105 for the post-casting strip. Specifically, first use the plate 76, the steel section 77, the connecting screw 78, and the transverse rod 82 to assemble a steel-steel plate combination post-casting strip temporary closing device, and then install the steel-steel plate combination post-casting strip temporary closing device at the reserved post-casting strip; after the construction of the foundation slab 4 is completed, remove the steel-steel plate combination post-casting strip temporary closing device, and then cast the post-casting strip. Specifically, first remove the pressure plate 75, and then remove the connecting screw 78 and the transverse rod 82.

[0076] Example 2

[0077] As another embodiment, the underground frame structure obtained by the method proposed in the first embodiment is as follows: Figures 1 to 23As shown, an underground frame structure includes: a structural top plate 1, an underground continuous wall 2, an engineering pile 3, a foundation bottom plate 4, a water collection well 5, a retaining pile 6, a central island main structure top plate 7, a lattice column 8, a second steel support 9, a deformable adjustable concrete horizontal support 10, an embedded steel plate 11, a central island main structure bottom plate 12, a central island main structure middle plate 13, a crown beam 14, a waist beam 15, a concrete support longitudinal main reinforcement 16, a concrete support circumferential stirrup 17, a connecting reinforcement 18, a support column 19, an embedded bolt 20, a nut 21, a sliding connector 22, a structural top plate circumferential stirrup 23, and a structural top plate longitudinal main reinforcement 24. Support plate 25. Reserved hole 26. Sliding slot 27. Sliding spring 28. Jack 29. Telescopic rod 30. Ballast ladder frame pressure plate 31. Ballast ladder frame 32. Ballast ladder frame side plate 33. Top support plate 34. Top pressure beam 35. Vertical support system 36. Bottom support plate 37. Vertical support rod 38. Vertical embedded screw 39. Oblique embedded screw 40. Bottom plate chamfer template 41. Bottom plate chamfer 42. Support plate 43. Side wall 44. Oblique pressure beam 45. Cantilever platform 46. Standard section tripod 47. Bolt 48. Heightened section tripod 49. Bottom tie system 50. Rear adjustment leg 5 1. H-shaped steel 52, front adjustment leg 53, embedded straight threaded steel 54, connecting nut 55, pressure beam 56, casting gasket 57, butterfly nut 58, external connecting rod 59, formwork fastener 60, side wall steel formwork 61, trough vertical rib 62, trough main rib 63, embedded U-shaped straight threaded steel 64, connecting steel 65, vertical pressure beam 66, gasket 67, fixed butterfly nut 68, connecting rod 69, water collection well opening formwork 70, lifting ring 71, upper cross beam 72, lower cross beam 73, vertical connecting rod 74, pressure plate 75, steel plate 76, section steel 77, connecting screw 78, fixing bolt 79, fixing nut 80, post-casting strip formwork System 81, transverse rod 82, top plate bottom formwork 83, slope bottom plate 84, unit slope adjustment bracket 85, vertical steel pipe 86, bottom adjustment pad 87, slope bottom plate formwork 88, top adjustment support plate 89, transverse long formwork 90, longitudinal long formwork 91, prefabricated cap membrane 92, fixing screws 93, external connector 94, longitudinal short formwork 95, screws 96, transverse short formwork 97, longitudinal middle formwork 98, internal connector 99, connector reserved hole 100, pile foundation cap 101, bottom base 102, lower nut 103, upper nut 104, post-casting strip independent formwork system 105, tripod base 106;

[0078] The underground frame structure construction adopts deformable and adjustable concrete horizontal support 10, bottom plate chamfer formwork installation and stabilization system, post-cast strip independent formwork system 105, adjustable water collection well opening formwork system, side wall single-sided formwork system, large slope support slope adjustment system and prefabricated foundation membrane construction system;

[0079] The deformable and adjustable concrete horizontal support 10 is arranged between the crown beam 14 and the top plate 7 of the main structure of the center island. An embedded bolt 20 is provided in the center of the end of the deformable and adjustable concrete horizontal support 10. The embedded bolt 20 is connected to the sliding connector 22 and fixed with a nut 21; the sliding connector 22 is provided near the top end of the embedded steel plate 11, and the embedded steel plate 11 is provided in the top center of the top plate 7 of the main structure of the center island; the top end of the embedded steel plate 11 is provided with a sliding groove 27, and a sliding connector 22 is provided in the sliding groove 27. A sliding spring 28 is provided between the sliding connector 22 and the sliding groove 27. A plurality of through reserved holes 26 are provided on the side of the sliding connector 22, and the embedded bolts 20 pass through the reserved holes 26.

[0080] The base plate chamfer template installation and stabilization system is used to reinforce the base plate chamfer template 41 at the base plate chamfer corner 42, which is mainly composed of a jack 29, a weighted ladder frame 32, a vertical support system 36, a vertical embedded screw 39, and an oblique embedded screw 40; the vertical support system 36 is used to support the weighted ladder frame 32, and a top support plate 34 is provided on the top, and a bottom support plate 37 is provided at the bottom of the vertical support system 36; the weighted ladder frame 32 is provided with a weighted ladder frame side plate 33 on the side, and a weighted ladder frame pressure plate 31 is provided at the bottom of the weighted ladder frame 32, and a jack 29 is provided below the upper end of the weighted ladder frame pressure plate 31; The vertical embedded screws 39 and the diagonal embedded screws 40 are embedded in the top of the foundation slab 4. The vertical embedded screws 39 pass through one end of the bottom support plate 37 and are secured by a top pressure beam 35. The diagonal embedded screws 40 pass through the bottom slab chamfer template 41 and the lower end of the weighted ladder frame pressure plate 31 and are secured by a diagonal pressure beam 45. The weighted ladder frame side plates 33 rest on top of the top support plate 34, and the weighted ladder frame pressure plate 31 presses on top of the bottom slab chamfer template 41. The jack 29 is connected to the telescopic rod 30, and a support plate 43 is provided on top of the telescopic rod 30, which is supported on the wall. The other end of the bottom support plate 37 is supported by a vertical support rod 38 and secured by a lower nut 103 and an upper nut 104. The bottom of the vertical support rod 38 is provided with a bottom base 102, which is located above the foundation slab 4.

[0081] The independent formwork system 105 for the post-casting strip is mainly composed of a steel section-steel plate combined post-casting strip temporary closing device, a post-casting strip formwork system 81, and a top plate bottom formwork 83. The steel section-steel plate combined post-casting strip temporary closing device includes: steel plate 76, steel section 77, connecting screws 78, and transverse rods 82. The steel plate 76 is supported between the structural top plates 1 on both sides of the post-casting strip, the steel section 77 and the transverse rods 82 are supported between the steel plates 76, and the gap between the steel section 77 and the steel plate 76 is filled with a pressing plate 75. A steel section 77 is provided on the top of the connecting screw 78, and the post-casting strip formwork system 81 is supported on the bottom of the top plate bottom formwork 83; a fixing nut 80 is provided at the center of the inner side of the steel plate 76, and both ends of the transverse rod 82 are respectively connected to the fixing nuts 80. Fixing bolts 79 are provided at the bottom and top of the center of the transverse rod 82, and the fixing bolts 79 are connected to the connecting screw 78.

[0082] The adjustable water collection well opening template system includes: a water collection well opening template 70, a lifting ring 71, an upper cross beam 72, a lower cross beam 73, and a vertical connecting rod 74. The water collection well opening template 70 is provided with a lifting ring 71 on the top. The inner wall of the water collection well opening template 70 is supported by a recyclable inner support frame. The recyclable inner support frame is composed of an upper cross beam 72, a lower cross beam 73, and a vertical connecting rod 74. A vertical connecting rod 74 is provided between the cross beam 72 and the lower cross beam 73.

[0083] The side wall single-sided formwork system is composed of a standard section tripod 47, a heightened section tripod 49, a bottom tie system 50, a rear adjustment leg 51, a front adjustment leg 53, a pre-buried straight threaded steel 54, an external connecting rod 59, and a side wall steel formwork 61; the side wall steel formwork 61 is reinforced with a tripod system, and the tripod system is composed of a cantilever platform 46, a standard section tripod 47, and a heightened section tripod 49. The standard section tripod 47 and the heightened section tripod 49 are connected at the joint with bolts 48, and the cantilever platform 46 is arranged on the top side of the standard section tripod 47; the side of the side wall steel formwork 61 is provided with grooved vertical ribs 62 and grooved main ribs 63, and the grooved main ribs 63 are connected to the standard section tripod 47 and the heightened section tripod 49 by template fasteners 6 0 connection; the embedded straight threaded steel 54 is provided at the top of the base plate chamfer 42, and the embedded straight threaded steel 54 is connected to the outer connecting rod 59 by a connecting nut 55; the embedded U-shaped straight threaded steel 64 is provided at the top of the foundation base plate 4, and the embedded U-shaped straight threaded steel 64 is connected to the connecting rod 69 by a connecting steel part 65; the outer connecting rod 59 passes through one end of the tripod base plate 106 and is fixed with a pressure beam 56, a casting gasket 57, and a butterfly nut 58; the connecting rod 69 passes through the other end of the tripod base plate 106 and is fixed with a vertical pressure beam 66, a gasket 67, and a pressure-fixed butterfly nut 68; a rear adjustment leg 51 and a front adjustment leg 53 are provided below the tripod base plate 106, and an H-shaped steel 52 is provided below the rear adjustment leg 51.

[0084] The steep slope support slope adjustment system comprises: a unit slope adjustment support 85, a vertical steel pipe 86, a bottom adjustment pad 87, and a top adjustment support plate 89. The vertical steel pipe 86 and the horizontal steel pipe are assembled into the unit slope adjustment support 85. The top of the vertical steel pipe 86 is provided with a top adjustment support plate 89, and the bottom of the vertical steel pipe 86 is provided with a bottom adjustment pad 87. The slope bottom plate template 88 is provided above the top adjustment support plate 89.

[0085] The prefabricated foundation membrane construction system comprises: a horizontal long template 90, a vertical long template 91, a prefabricated foundation membrane 92, an external connector 94, a vertical short template 95, screws 96, a horizontal short template 97, a vertical middle template 98, and an internal connector 99; the horizontal long template 90, the vertical long template 91, the vertical short template 95, the horizontal short template 97, and the vertical middle template 98 are assembled into a skeleton structure of the prefabricated foundation membrane 92, and are fixed with fixing screws 93, an external connector 94 and an internal connector 99; the horizontal long template 90, the vertical long template 91, the vertical short template 95, the horizontal short template 97, and the vertical middle template 98 are assembled into a skeleton structure of the prefabricated foundation membrane 92, and are fixed with fixing screws 93, an external connector 94 and an internal connector 99; the horizontal long template 90, the vertical long template 91, the vertical short template 95, the horizontal short template The outer ends of the plate 97 and the longitudinal middle template 98 are provided with multiple screws 96; the transverse long template 90 and the longitudinal short template 95 are fixed at the joint with external connecting parts 94; the longitudinal short template 95 and the transverse short template 97 are fixed at the joint with external connecting parts 94; the transverse short template 97 and the longitudinal middle template 98 are fixed at the joint with internal connecting parts 99; the external connecting parts 94 and the internal connecting parts 99 adopt a "∧" shape design, and are provided with multiple connecting part reserved holes 100 on the side; the screws 96 pass through the connecting part reserved holes 100 and are fixed with fixing screws 93.

Claims

1. A construction method for an underground frame structure, characterized in that The following steps are involved: Step 1: Construct the underground continuous wall (2), engineering piles (3), retaining piles (6) and lattice columns (8), and construct the first deformable adjustable concrete horizontal support (10). The foundation bottom plate (4) is excavated in a basin-like manner, and the inner side of the underground continuous wall (2) is excavated with a two-level slope center island; the top of the underground continuous wall (2) is provided with a crown beam (14), and the middle of the underground continuous wall (2) is provided with a waist beam (15); first, the structural top plate hoop reinforcement (23) and the structural The longitudinal main reinforcement (24) of the top plate is tied, the lattice column (8) is arranged on the top of the center island main structure bottom plate (12), the top of each layer of lattice column (8) is provided with a supporting plate (25), the center island main structure middle plate (13) and the center island main structure top plate (7) are provided on the supporting plate (25); the soil in the middle of the foundation pit at the foundation bottom plate (4) is excavated in a basin-like manner, the soil inside the underground continuous wall (2) is sloped in two levels, and counterpressure soil is reserved to complete the excavation of the center island soil; Step 2: assemble the prefabricated foundation membrane (92) on top of the engineering pile (3) and cast the pile foundation foundation (101); install the adjustable water collection well hole template (70) and support it with a recyclable inner support frame, and then cast the water collection well (5); Step 3: construct the foundation slab (4) and the supporting columns (19) in sequence; tie the reinforcement cages of the foundation slab (4) and the supporting columns (19); Step 4: Install the bottom plate chamfer template (41) through the bottom plate chamfer template installation and stabilization system, and cast the bottom plate chamfer (42); construct the side wall (44) through the side wall single-sided template system; Step 5: Connect the deformable and adjustable concrete horizontal support (10) to the top plate (7) of the main structure of the center island, and set a sliding connector (22) on the side of the end of the deformable and adjustable concrete horizontal support (10); connect the deformable and adjustable concrete horizontal support (10) to the top plate (7) of the main structure of the center island, and the deformable and adjustable concrete horizontal support (10) includes a concrete support longitudinal main reinforcement (16) and a concrete support annular stirrup (17); first tie the concrete support longitudinal main reinforcement (16) and the concrete support annular stirrup (17), and connect the concrete support longitudinal main reinforcement (16) and the structural top plate longitudinal main reinforcement (24) through the connecting reinforcement (18); A sliding connector (22) is connected and fixed to the side of the end of the deformable and adjustable concrete horizontal support (10) by means of embedded bolts (20) and fixed with nuts (21); the sliding connector (22) is arranged near the top end of the embedded steel plate (11), and the embedded steel plate (11) is arranged at the top center of the top plate (7) of the central island main structure; a sliding groove (27) is provided at the top end of the embedded steel plate (11), a sliding connector (22) is provided in the sliding groove (27), a sliding spring (28) is provided between the sliding connector (22) and the sliding groove (27), a plurality of through reserved holes (26) are provided on the side of the sliding connector (22), and the embedded bolts (20) pass through the reserved holes (26); a support column (19) is provided below the deformable and adjustable concrete horizontal support (10); Step 6: Excavate the back pressure area and construct the second steel support (9), then excavate the back pressure soil and construct the foundation base plate (4), reserve the post-casting strip through the post-casting strip independent formwork system (105) and cast it.

2. The construction method of the underground frame structure according to claim 1, characterized in that: In step 2: the skeleton structure of the prefabricated foundation membrane (92) is formed by assembling a transverse long template (90), a longitudinal long template (91), a longitudinal short template (95), a transverse short template (97) and a longitudinal middle template (98); The steel cage of the water collection well (5) is tied, and an adjustable water collection well hole template (70) system is installed at the water collection well (5) according to the design drawings, and then the water collection well (5) is poured. Specifically, the recyclable inner support frame is formed by assembling an upper cross beam (72), a lower cross beam (73) and a vertical connecting rod (74). The top of the water collection well hole template (70) is provided with a lifting ring (71), and the lifting ring (71) is connected to a steel wire rope. Then, the water collection well hole template (70) is installed at the water collection well (5) to be poured by a crane, and the recyclable inner support frame is installed in the water collection well hole template (70); In step three, vertical embedded screws (39), oblique embedded screws (40) and embedded U-shaped straight threaded steel bars (64) are arranged on the top of the foundation base plate (4).

3. The construction method of the underground frame structure according to claim 1, characterized in that: In step 4: first, tie the steel cage at the bottom plate chamfer (42), then install the bottom plate chamfer template to stabilize the system, then cast the bottom plate chamfer (42), and set the embedded straight threaded steel (54) on the top of the bottom plate chamfer (42). The bottom plate chamfer template installation and stabilization system includes a weighted ladder frame (32), a vertical support system (36), a vertical embedded screw (39) and an oblique embedded screw (40); the vertical support system (36) supports the weighted ladder frame (32), the top of the vertical support system (36) is provided with a top support plate (34), and the bottom of the vertical support system (36) is provided with a bottom support plate (37); the side of the weighted ladder frame (32) is provided with a weighted ladder frame side plate (33), and the bottom of the weighted ladder frame (32) is provided with a A weighted ladder frame pressure plate (31) is provided with a jack (29) below the upper end of the weighted ladder frame pressure plate (31); the vertical embedded screw rod (39) and the oblique embedded screw rod (40) are embedded in the top of the foundation base plate (4); the vertical embedded screw rod (39) passes through one end of the bottom support plate (37) and is fixed with a top pressure beam (35); the oblique embedded screw rod (40) passes through the bottom plate chamfer template (41) and the lower end of the weighted ladder frame pressure plate (31), and is pressed and fixed with an oblique pressure beam (45).

4. The construction method of the underground frame structure according to claim 3, characterized in that: In step 4: specifically, the bottom plate chamfer template (41) is installed on the side of the bottom plate chamfer (42), the weighted ladder frame (32) is installed on the top of the bottom plate chamfer template (41), and the bottom plate chamfer template (41) and one end of the weighted ladder frame (32) are fixed by using the oblique embedded screw (40); the vertical support system (36) is installed below the side of the weighted ladder frame (32), and the jack (29) is adjusted so that the support plate (43) of the telescopic rod (30) is supported on the wall; one end of the bottom support plate (37) of the vertical support system (36) is fixed by using the vertical embedded screw (39), and the vertical support rod (38) is installed at the other end of the bottom support plate (37); and the embedded straight threaded steel bar (54) is set on the top of the bottom plate chamfer (42).

5. The construction method of the underground frame structure according to claim 4, characterized in that: In step 4: the side wall single-sided formwork system includes a bottom tie system (50), a rear adjustment leg (51), a front adjustment leg (53), a pre-buried straight threaded steel (54), an external connecting rod (59) and a side wall steel formwork (61); the side wall steel formwork (61) is provided with a tripod system, the tripod system includes a cantilever platform (46), a standard section tripod (47) and a heightened section tripod (49), the standard section tripod (47) and the heightened section tripod (49) are connected at the joint with bolts (48), and the cantilever platform (46) is provided at the standard section tripod (47). The top side; the side of the side wall steel formwork (61) is provided with a groove vertical rib (62) and a groove main rib (63), and the groove main rib (63) is connected to the standard section tripod (47) and the heightened section tripod (49) by a template fastener (60); the cantilever platform (46), the standard section tripod (47) and the heightened section tripod (49) form a tripod system, the side wall steel formwork (61) is connected to the tripod system by the template fastener (60), and the side wall (44) single-side formwork system is fixed by the embedded straight threaded steel (54) and the embedded U-shaped straight threaded steel (64).

6. The construction method of the underground frame structure according to claim 1, characterized in that: In step 6: unloading the back pressure soil to the bottom of the second steel support (9), constructing the second steel support (9), and after the second steel support (9) forms strength, unloading the back pressure soil to the design elevation of the foundation bottom plate (4); the two ends of the second steel support (9) are respectively connected to the waist beam (15), and there is a support column (19) under the second steel support (9); The foundation base plate (4) with a slope is a slope base plate (84). When constructing the foundation base plate (4) with a slope, a large-slope support slope adjustment system is first set up. The large-slope support slope adjustment system includes a unit slope adjustment support (85). The unit slope adjustment support (85) includes a vertical steel pipe (86) and a horizontal steel pipe. The top of the vertical steel pipe (86) is provided with a top adjustment support plate (89), and the bottom is provided with a bottom adjustment pad (87). The top of the top adjustment support plate (89) is provided with a slope base plate template (88). Specifically, the vertical steel pipe (86) and the horizontal steel pipe are assembled into a unit slope adjustment support (85), and the slope is adjusted by the bottom adjustment pad (87) and the top adjustment support plate (89).

7. The construction method of the underground frame structure according to claim 1, characterized in that: In step six: when constructing the structural top plate (1), it is necessary to reserve a post-casting strip, which is achieved by an independent post-casting strip formwork system (105). The independent post-casting strip formwork system (105) includes a steel-steel plate combined post-casting strip temporary closing device, a post-casting strip formwork system (81) and a top plate bottom formwork (83). The steel-steel plate combined post-casting strip temporary closing device includes a steel plate (76), a steel (77), a connecting screw (78) and a transverse rod (82). The steel plate (76) is supported between the structural top plates (1) on both sides of the post-casting strip. The steel (77) and the transverse rod (82) are supported between the steel plates (76). The gap between the steel (77) and the steel plate (76) is filled with a pressing plate (75). The top of the connecting screw (78) is provided with a steel (77). The post-casting strip formwork system (81) is supported at the bottom of the top plate bottom formwork (83). Specifically, a steel plate (76), a steel section (77), a connecting screw (78), and a transverse rod (82) are first assembled to form a temporary closing device for a steel-steel plate combined post-casting strip, and then the temporary closing device for a steel-steel plate combined post-casting strip is installed at the reserved post-casting strip. After the construction of the structural top plate (1) is completed, the temporary closing device for the steel-steel plate combined post-casting strip is removed, and then the post-casting strip is cast. Specifically, the pressing plate (75) is first removed, and then the connecting screw (78) and the transverse rod (82) are removed.

8. Underground frame structure, characterized in that, Obtained by the method according to any one of claims 1 to 7.

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