Splicing construction method for three-layer overlapping assembly type station

Abstract

The invention relates to the technical field of station construction, in particular to a three-layer overlapping assembly type station assembling construction method, and an overlapping assembly type station comprises a bottom plate, prefabricated side walls, cast-in-place side walls, middle stand columns, middle longitudinal beams, middle plates, top longitudinal beams, a prefabricated top plate and a cast-in-place top plate. The construction method specifically comprises the steps that concrete is poured in situ to form the bottom plate, then the prefabricated side walls are assembled, the cast-in-place side walls are poured, then the middle stand columns and the middle longitudinal beams are assembled, connecting joint concrete is poured, the middle plate is erected, the concrete is symmetrically poured at the two ends of the middle plate for forming, and single-layer construction is completed. When the station is constructed to the top sealing of the uppermost layer, the middle plate serves as the foundation, the cast-in-place side walls, the prefabricated side walls, the middle stand columns and the top longitudinal beams are spliced and poured in sequence, the prefabricated top plate is erected, and the cast-in-place top plate is poured to complete top sealing; the method is easy to control, the accuracy of structure construction is guaranteed, the construction period is short, the construction quality is stable and reliable, and the construction efficiency can be obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of station construction, and in particular to an assembly construction method for a three-layer superimposed assembled station. Background Art

[0002] With the acceleration of urbanization, urban rail transit networks continue to expand, and the number of station construction has increased significantly. Traditional station construction mostly adopts cast-in-place concrete construction methods. However, this method faces many challenges during the construction process. For example, the construction period is long, and a large number of on-site formwork construction, steel bar binding, concrete pouring and maintenance processes are required. The process connection takes a long time, and labor costs, equipment rental costs, etc. continue to accumulate, resulting in high overall construction costs.

[0003] Therefore, we consider using the prefabricated construction method, which uses prefabricated components for assembly on the construction site, which has the advantages of fast construction speed and controllable quality. At present, there are two-layer or multi-layer overlapping station structures at the intersection of stations and other places. The station structure is complex, and simple assembly is difficult to be directly applied to station construction. It is necessary to develop special prefabricated technology that is suitable for the complex structure of the station. In view of the many disadvantages of the traditional cast-in-place station construction method and the limitations of ordinary prefabricated construction technology in the application of stations, it is urgent to develop a three-layer overlapping prefabricated station assembly construction method, and improve the speed and quality of station construction through reasonable design and assembly technology. In view of this, we propose a three-layer overlapping prefabricated station assembly construction method. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies mentioned in the above background technology and to provide a method for assembling and constructing a three-layer stacked prefabricated station.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A method for assembling and constructing a three-layer stacked assembled station, wherein the stacked assembled station comprises a bottom plate, prefabricated side walls, cast-in-place side walls, a center column, a center longitudinal beam, a center plate, a top longitudinal beam, a prefabricated top plate and a cast-in-place top plate for forming a station space;

[0007] The construction method is specifically as follows: cast concrete in situ to form the bottom plate, then assemble the prefabricated side walls and cast the cast-in-situ side walls, then assemble the central column and the central longitudinal beam, cast the connection node concrete, then erect the middle plate, symmetrically cast concrete at both ends of the middle plate to form, and complete the single-layer construction;

[0008] When the station is overlapped with no less than two layers, the middle plate is used as the foundation, and the single-layer construction steps are repeated from bottom to top to complete the construction of the middle layer;

[0009] When the station construction reaches the top capping, the middle plate is used as the foundation, and the cast-in-place side walls and the prefabricated side walls, the center column and the top longitudinal beam are assembled and cast in sequence, and the prefabricated top plate is erected and the cast-in-place top plate is cast to complete the capping.

[0010] Preferably, the specific construction method of the base plate is:

[0011] Step 1: Tie the bottom plate reinforcement and tie the outer main reinforcement of the cast-in-place side wall according to the position of the prefabricated side wall;

[0012] Step 2: After the outer main reinforcement is tied, the position of the I-beam slot is measured and laid out. The I-beam slot is welded to the positioning steel plate according to the laid-out position. The I-beam slot and the positioning steel plate are hoisted into place by a crane and firmly welded to the bottom plate steel bars and the outer main reinforcement of the cast-in-place side wall. After welding, the flatness, verticality and centerline position of the slot are checked;

[0013] Step 3: After checking that the position is correct, the concrete pouring construction is carried out on the base plate and the cast-in-place side wall.

[0014] Preferably, grooves are provided on both sides of the prefabricated side walls, and the grooves between adjacent prefabricated side walls are sealed by sticking a sealing core rod with an adhesive.

[0015] Preferably, the prefabricated side wall installation construction method is:

[0016] Step 1: A 2 cm gap is left at the I-beam slot where the bottom plate and the prefabricated side wall are assembled. Before assembling the prefabricated side wall, a layer of 2.5-3 cm mortar needs to be applied in advance on the short side wall constructed at the same time as the bottom plate;

[0017] Step 2: hoist the prefabricated side wall into the foundation pit, adjust the verticality, and lower it vertically so that the I-shaped steel at the bottom of the prefabricated side wall is inserted into the I-shaped steel slot, and the welded connection parts are kept fixed after insertion; set four prefabricated side walls as a construction unit, install the plug template after assembling the four prefabricated side walls, and pour concrete for molding and curing;

[0018] Step 3: After the initial setting of the concrete, cover it with geotextile and sprinkle water for curing or seal it with water for curing. After the initial setting strength is greater than 2.5MPa, remove the plugging formwork, and roughen it in preparation for assembling the next construction unit.

[0019] Preferably, the construction method for installing the center column is specifically as follows: frame column steel bars and embedded screws are reserved on the base plate, the center column is hoisted into the foundation pit after casting and curing the formed bottom longitudinal beam, the screw holes of the flange plate at the bottom of the center column are fine-tuned and aligned with the embedded screws, the bottom of the center column is in place, and is connected and fixed using corresponding nuts. After the screw connection is completed, concrete is poured at the bottom foot of the center column to seal it.

[0020] Preferably, the construction method for installing the center longitudinal beam is as follows: before hoisting the center longitudinal beam, first install the top of the center column in conjunction with the position positioning pin, hoist the center longitudinal beam into the foundation pit, calibrate the position to complete the installation; install the formwork at the installation node between the center column and the center longitudinal beam, and pour concrete to connect the whole.

[0021] Preferably, the construction method for installing the middle plate is as follows: before hoisting the middle plate, first install positioning pins on the top of the middle longitudinal beam and the joint position between the top of the prefabricated side wall and the middle plate; after the middle plate is hoisted into the foundation pit, adjust the position so that the middle plate is placed on the prefabricated side walls and the middle longitudinal beam on both sides; install steel bars at the plate-wall nodes between the middle plate and the prefabricated side walls on both sides and at the plate-beam nodes between the middle plate and the middle longitudinal beam; install plug formwork, pour concrete to connect them into a whole, and cover with geotextile and sprinkle water for maintenance after the concrete has initially set.

[0022] Preferably, the adhesive is any one of a polyurethane sealant and a water-swellable polyurethane waterproofing glue.

[0023] Preferably, the sealing core rod is made of a bentonite rubber water-swelling water stop strip.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Compared with traditional cast-in-place stations, this three-layer stacked assembled station assembly construction method can quickly and accurately calibrate and assemble the station structure with prefabricated structures, and has the advantages of controllable construction quality, improved work efficiency, reduced noise and dust, and improved worker operations;

[0026] 2. This construction method is easy to control and can be accurately constructed through prefabricated components, ensuring the accuracy of structural construction and simple conversion of construction procedures;

[0027] 3. This construction method has a short construction period and flexible structural form, and can be used for multi-story and multi-span structures. It is conducive to saving the use of formwork supports and reducing the generation of construction waste. The bottom plate is cast in place to achieve rapid bottom sealing of the foundation pit and avoid base settlement or uplift. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the assembly construction of the composite assembled station of the present invention;

[0030] Figure 2 This is one of the schematic diagrams of the construction process of the present invention;

[0031] Figure 3 This is the second schematic diagram of the construction process of the present invention;

[0032] Figure 4 This is the third schematic diagram of the construction process of the present invention;

[0033] Figure 5 This is the fourth schematic diagram of the construction process of the present invention;

[0034] Figure 6 This is the fifth schematic diagram of the construction process of the present invention;

[0035] Figure 7 This is the sixth schematic diagram of the construction process of the present invention;

[0036] Figure 8 This is the seventh schematic diagram of the construction process of the present invention;

[0037] Fig. 9 This is the eighth schematic diagram of the construction process of the present invention;

[0038] Fig.10 This is a schematic diagram of the I-beam clamping slot and I-beam clamping assembly of the present invention;

[0039] Fig.11 This is a top view of the construction of the present invention;

[0040] Fig.12 This is a schematic diagram of the ground-connected wall structure of the present invention;

[0041] Fig.13 It is a partial structural cross-sectional view of the ground-connected wall of the present invention;

[0042] Fig.14 It is a local connection relationship diagram of the ground-connected wall of the present invention;

[0043] Fig.15 This is a schematic diagram of the installation of the center column of the present invention.

[0044] The meaning of each number in the figure is:

[0045] 1. Bottom plate; 2. Prefabricated side wall; 3. Center column; 4. Center longitudinal beam; 5. Center plate; 6. Top longitudinal beam; 7. Prefabricated top plate; 8. Cast-in-place side wall; 9. Cast-in-place top plate; 10. Steel support; 11. Dewatering well; 12. I-beam slot; 13. I-beam; 14. Embedded anchor plate; 15. Ground-connected wall. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0047] See also Figure 1-15 The present invention describes the above technical solution in detail through the following embodiments:

[0048] The construction steps of the three-layer stacked assembled station assembly construction method of this embodiment are as follows: Figure 2-Figure 9 As shown, taking the three-story underground station as an example, its superimposed assembled station includes a bottom plate 1, prefabricated side walls 2, cast-in-place side walls 8, center columns 3, center longitudinal beams 4, center plates 5, top longitudinal beams 6, prefabricated top plates 7 and cast-in-place top plates 9 which can form the station space after assembly construction. In this embodiment, the center column 3, center longitudinal beam 4, center plate 5, top longitudinal beam 6 and prefabricated top plates 7 are all prefabricated concrete components. The bottom plate 1 needs to be cast in place according to the site conditions, and the bottom longitudinal beams are cast as supports.

[0049] The construction method of this embodiment is specifically as follows: first, cast concrete at the bottom of the foundation pit to form a bottom plate 1, then assemble the precast side walls 2 and cast the cast-in-place side walls 8, then assemble the center column 3 and the center longitudinal beam 4 in sequence, cast the connecting node concrete, then erect the center plate 5, symmetrically cast concrete at the nodes at both ends of the center plate 5 to complete the single-layer construction; each layer of precast components forms a ring body, and four layers are set as a circular construction section to complete the single-layer construction; when the station has three layers stacked up and down, use the center plate 5 as the foundation, assemble the precast side walls 2, the center column 3 and the top longitudinal beam 6 in sequence, and erect the precast top plate 7 to complete the capping; it should be noted that after assembling 4 rings, tie the main reinforcement on the surface layer of the precast top plate 7, install the plug templates at both ends, and cast concrete to form the cast-in-place top plate 9.

[0050] Specifically, Figure 2-Figure 9The structure shown in the figure firstly digs the foundation pit deeply, excavates the foundation pit in layers from top to bottom, and sets up multiple steel supports 10 after excavating to 0.5m below the support, and sets up a precipitation well 11; when excavating to 0.2-0.3m above the elevation of the bottom surface of the foundation pit, manually excavates to the bottom of the foundation pit, treats the bottom of the foundation pit, applies a grounding grid, lays a cushion layer, and then lays a bottom plate waterproof layer and a fine stone concrete protective layer in sequence from bottom to top, and casts a ground-connected wall 15 on the foundation pit wall, in which a pre-buried anchor plate 14 is arranged; then cast the main structure bottom plate 1, bottom longitudinal beam and cast-in-place side wall 8, and when the concrete strength reaches the design strength, remove the corresponding steel supports 10 from bottom to top; the specific construction method of casting the bottom plate 1 is as follows: cast-in-place bottom When preparing the prefabricated plate 1, it is necessary to embed an I-beam slot 12 at the corresponding position of the bottom of the prefabricated side wall 2, and first tie the bottom plate 1 steel bars; the operating personnel determine the placement position of the steel bars outside the prefabricated side wall 2 and mark them with lines, tie the prefabricated side wall main bars according to the position of the prefabricated side wall 2, and install the positioning steel plate after the installation of the prefabricated side wall 2 steel bars. Weld the steel bar positioning clamps on the prefabricated side wall 2 to lay the steel bars. After welding, check the flatness and verticality of the slot and the center line position to ensure that the outer steel bar spacing and the thickness of the protective layer meet the design requirements; in this embodiment, the bottom of the prefabricated side wall 2 is provided with an I-beam 13 for insertion into the I-beam slot 12. After the check is completed, the bottom plate 1 and the cast-in-place side wall 8 are poured with concrete.

[0051] It should be noted that in this embodiment, a bottom longitudinal beam is cast at the bottom end of the middle column 3. Fig.15 The structure shown requires reserved frame-column reinforcement and embedded screws during the pouring process, that is, after forming, there are frame-column reinforcement and embedded screws for installing the central column 3; after the bottom plate 1 and the bottom longitudinal beam are cast and cured, the prefabricated side wall 2 needs to be waterproofed, that is, the prefabricated side wall 2 adopts external waterproofing, the earthwork, steel bar heads, and stop iron sheets on the base surface of the ground-connected wall are cleaned, and the potholes are leveled with cement mortar. Then, according to the construction sections, the waterproof membrane is laid from one end to the other, and the longitudinal lap length of the waterproof membrane is set to ≥80mm, and the transverse lap length is set to ≥100mm. The waterproof membrane is laid to the bottom of the embedded steel plate of the top tie rod of the prefabricated side wall to ensure that the joints between adjacent membranes are staggered, and the top membrane needs to be rolled inward to be protected when pouring concrete.

[0052] After the prefabricated side wall 2 is accepted and enters the site, it will be hoisted to the component stacking area. The on-site workers will cut the steel bars on the soil-facing side according to the designed prefabricated side wall reinforcement drawing, and tie them according to the designed spacing. The outer positioning steel plate with a length of 2.99m is welded to the bottom vertical main reinforcement on the soil-facing side, and connected to the bottom I-beam by lap welding; then it is necessary to bond the bentonite rubber water-swelling waterstop strips at the grooves on both sides of the prefabricated side wall 2 with polyurethane sealant.

[0053] In order to facilitate lifting, this embodiment has 6 hooks embedded in the prefabricated side wall 2, 4 of which are embedded on the soil-facing side and 2 on the top. The auxiliary hoist has 4 lifting points on the soil-facing surface and the main hoist has 2 lifting points on the top. A 50t+30t multifunctional gantry crane is used for double-machine lifting. During lifting, the auxiliary hoist first lifts the prefabricated side wall 2 horizontally above the foundation pit, and then the main hoist is slowly retracted until it is vertically stressed, and the auxiliary hoist is slowly lowered to make the prefabricated side wall 2 perpendicular to the foundation pit. After the gantry crane travels to the installation position, the main hoist is used to rotate the hoist 360° to make the prefabricated side wall parallel to the steel support, and then the main and auxiliary hoists are lowered at the same time to make the prefabricated side wall 2 enter the foundation pit, the auxiliary hoist wire rope and shackle are removed, and the main hoist lifts the prefabricated side wall 2 to the designed position, so that the I-beam 13 is inserted into the I-beam slot 12 embedded in the bottom plate 1.

[0054] After the prefabricated side wall 2 is assembled in place, the I-shaped steel 13 is welded to the I-shaped steel slot 12. After the four pieces of the prefabricated side wall 2 are assembled and reinforced, the plug template is installed, the plug construction is adopted, and the cast-in-place concrete is poured using a car pump, so that the cast-in-place side wall 8 can be connected with the prefabricated side wall 2; in order to prevent the concrete from segregating due to the high distance between the discharge port and the pouring surface during concrete pouring, when prefabricating the prefabricated side wall 2, the hook hanging position is appropriately adjusted every 1.2m, and a 0.3m wide discharge port is reserved. During pouring, the automobile pump hose is lengthened by one section so that the hose can be inserted into the prefabricated side wall from the discharge port. Pouring can only be carried out after the bottom of the hose is less than 2m from the bottom of the pouring surface. The prefabricated side wall is poured symmetrically in layers. During the process, an inserted vibrator is used to vibrate the concrete. The vibrator moves 0.5m and the vibration time is 30-40s. After the initial setting of the concrete, it is covered with geotextile and watered for maintenance or sealed and stored with water for maintenance. After the initial setting strength is greater than 2.5MPa, the plug template is removed and roughened to prepare for assembly of the next construction unit.

[0055] Then, the center column 3 is hoisted into the foundation pit. After fine-tuning the center column 3, the bolt holes of the bottom flange plate are aligned with the positions of the embedded screws reserved on the bottom longitudinal beam, and then it is lowered into place. Then, double nuts are used to connect and fix it. In order to maintain the stability of the center column 3, concrete is poured at the bottom foot of the center column 3 to encapsulate it. Then, the positioning pins are installed at the junction of the top of the center column 3 and the center longitudinal beam 4, and the center longitudinal beam 4 is hoisted into the foundation pit. The position is calibrated to complete the installation.

[0056] After the middle plate 5 is accepted, it is hoisted to the storage area. The operators apply adhesive polyurethane sealant to the grooves of the stop seal strips on both sides of the middle plate 5. The adhesive should be avoided from contaminating the surface when applying. After the adhesive is applied, the stop bentonite rubber water-swelling water stop strip is pasted; 4 hooks are embedded on the top of the middle plate 5, and a 50t+30t multifunctional gantry crane is used for hoisting. The main crane is used to lift the middle plate and move it horizontally to the top of the foundation pit. At this time, the middle plate 5 is parallel to the width of the foundation pit. After the gantry crane drives to the installation position, the main crane is lowered , make the middle plate 5 enter the foundation pit and reach 10cm above the stirrups of the middle longitudinal beam 4, anchor the middle plate 4 into the steel bars in the middle longitudinal beam 4 and align the bottom positioning pin holes with the positioning pins of the prefabricated side walls 2 and the middle longitudinal beam 4, so that the middle plate 5 is placed between the prefabricated side walls 2 and the middle longitudinal beam 4; after the middle plate 5 is placed, install steel bars at the plate-wall nodes between the middle plate 5 and the prefabricated side walls 2 on both sides and the plate-beam nodes between the middle plate 5 and the middle longitudinal beam 4, install the plug template, pour concrete to connect them into a whole, cover them with geotextiles and sprinkle water for maintenance after the concrete is initially set, so far as Figure 1 Shown is a continuous mounting node.

[0057] Then, construction is carried out upwards. The construction process and method of the prefabricated side walls 2 on the negative first and second floors are the same as those of the prefabricated side walls 2 on the negative third floor. When the prefabricated side walls 2 on the negative second floor and the prefabricated side walls 2 on the negative third floor are prefabricated, the I-beam slots 12 can be pre-buried at the top of the prefabricated side walls 2 in advance. It should be noted that the construction process of the prefabricated top plate 7 is different from that of the middle plate 5. After the prefabricated top plate 7 is installed, it needs to be cast again to form a cast-in-place top plate 9, and the middle plate 5 is fully prefabricated. After the construction of the top waterproof layer is completed, the upper steel support 10 is removed. Other embodiments can also use concrete support. Then the top plate is covered with soil and backfilled, road traffic is restored, and the drainage well 11 on the bottom plate for draining water is closed to complete the construction of the three-story station structure.

[0058] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A three-layer stacked assembled station assembly construction method, characterized by: The composite assembled station comprises a bottom plate (1) for forming a station space, a prefabricated side wall (2), a cast-in-place side wall (8), a center column (3), a center longitudinal beam (4), a center plate (5), a top longitudinal beam (6), a prefabricated top plate (7) and a cast-in-place top plate (9); The construction method specifically comprises: pouring concrete in situ to form the bottom plate (1), then assembling the prefabricated side wall (2) and pouring the cast-in-situ side wall (8), then assembling the central column (3) and the central longitudinal beam (4), pouring the connection node concrete, then erecting the middle plate (5), symmetrically pouring concrete at both ends of the middle plate (5) to complete the single-layer construction; When the station is stacked up and down for not less than two layers, the middle plate (5) is used as the basis, and the single-layer construction steps are repeated from bottom to top to complete the construction of the middle layer; When the station construction reaches the top capping, the middle plate (5) is used as the foundation, and the cast-in-place side walls (8) and the prefabricated side walls (2), the middle column (3) and the top longitudinal beam (6) are assembled and cast in sequence, and the prefabricated top plate (7) is erected and the cast-in-place top plate (9) is cast to complete the capping.

2. The method for assembling and constructing a three-layered assembled station according to claim 1, characterized in that: The specific construction method of the bottom plate (1) is: Step 1: tying the steel bars of the bottom plate (1), and tying the outer main bars of the cast-in-place side wall (8) according to the position of the prefabricated side wall (2); Step 2: After the outer main reinforcement is tied, the position of the I-beam slot (12) is measured and laid out, and the I-beam slot (12) is welded to the positioning steel plate according to the laid-out position. The I-beam slot (12) and the positioning steel plate are hoisted into place by a crane, and are firmly welded to the bottom plate (1) steel bars and the outer main reinforcement of the cast-in-place side wall (8). After welding is completed, the flatness, verticality and centerline position of the slot are checked; Step 3: After checking that the position is correct, the bottom plate (1) and the cast-in-place side wall (8) are poured with concrete.

3. The method for assembling and constructing a three-layered assembled station according to claim 1, characterized in that: Grooves are provided on both sides of the prefabricated side wall (2), and the grooves between adjacent prefabricated side walls (2) are sealed by sticking a sealing core rod with an adhesive.

4. The method for assembling and constructing a three-layered assembled station according to claim 2, characterized in that: The installation construction method of the prefabricated side wall (2) is as follows: Step 1: A 2 cm gap is left at the I-beam slot (12) where the bottom plate (1) and the prefabricated side wall (2) are assembled. Before assembling the prefabricated side wall (2), a layer of 2.5-3 cm mortar needs to be applied in advance on the short side wall constructed at the same time as the bottom plate (1); Step 2: hoist the prefabricated side wall (2) into the foundation pit, adjust the verticality, and lower it vertically so that the I-shaped steel (13) provided at the bottom of the prefabricated side wall (2) is inserted into the I-shaped steel slot (12), and the welded connection parts are kept fixed after insertion; set four prefabricated side walls (2) as a construction unit, install the plug template after assembling the four prefabricated side walls (2), and pour concrete for molding and curing; Step 3: After the initial setting of the concrete, cover it with geotextile and sprinkle water for curing or seal it with water for curing. After the initial setting strength is greater than 2.5MPa, remove the plugging formwork, and roughen it in preparation for assembling the next construction unit.

5. The method for assembling and constructing a three-layered assembled station according to claim 4, characterized in that: The construction method for installing the center column (3) is specifically as follows: frame column reinforcement and embedded screws are reserved on the bottom plate (1), and after casting and curing the bottom longitudinal beam, the center column (3) is hoisted into the foundation pit. After the center column (3) is finely adjusted, the screw holes of the flange plate at the bottom are aligned with the embedded screws. The bottom of the center column (3) is in place and connected and fixed using corresponding nuts. After the screw connection is completed, concrete is poured at the bottom foot of the center column (3) to encapsulate it.

6. The method for assembling and constructing a three-layered assembled station according to claim 5, characterized in that: The construction method for installing the middle longitudinal beam (4) is specifically as follows: before the middle longitudinal beam (4) is hoisted, the top of the middle column (3) is first installed in conjunction with the position positioning pin, the middle longitudinal beam (4) is hoisted into the foundation pit, and the position is calibrated to complete the installation; a template is installed at the installation node of the middle column (3) and the middle longitudinal beam (4), and concrete is poured to connect the whole.

7. The method for assembling and constructing a three-layered assembled station according to claim 6, characterized in that: The construction method for installing the middle plate (5) is specifically as follows: before the middle plate (5) is hoisted, positioning pins are first installed at the top of the middle longitudinal beam (4) and the joint position between the top of the prefabricated side wall (2) and the middle plate (5); after the middle plate (5) is hoisted into the foundation pit, the position is adjusted so that the middle plate (5) is placed on the prefabricated side walls (2) and the middle longitudinal beam (4) on both sides; steel bars are installed at the plate-wall nodes between the middle plate (5) and the prefabricated side walls (2) on both sides and the plate-beam nodes between the middle plate (5) and the middle longitudinal beam (4); a plug template is installed, concrete is poured to connect them into a whole, and after the concrete is initially set, geotextile is covered and water is sprinkled for maintenance.

8. The method for assembling and constructing a three-layered assembled station according to claim 3, characterized in that: The adhesive is any one of polyurethane sealant and water-swellable polyurethane waterproofing glue.

9. The method for assembling and constructing a three-layered assembled station according to claim 3, characterized in that: The sealing core rod is a bentonite rubber water-swelling water stop strip.

Images