Assembling method for assembly type station components

Abstract

The invention discloses a method for assembling a fabricated station component, which comprises the following steps: after a foundation pit is excavated, constructing a cast-in-place bottom plate 1, and after the construction of the cast-in-place bottom plate 1 is completed, assembling a prefabricated component, the construction of the cast-in-place bottom plate at least completes the construction of the first eight rings, and the method specifically comprises the following steps: step 1, completing the production of the prefabricated component in a factory; transporting to a construction site; secondly, a fine flat strip is constructed at the bottom of the excavated foundation pit and serves as an assembling base face of a bottom plate 1 component; thirdly, a plurality of trolleys and cranes are arranged, the middle stand columns 5 are hoisted through the cranes, the bottoms of the middle stand columns 5 are temporarily fixed through bolts, and then the postures of the middle stand columns 5 are adjusted through the trolleys till positioning is completed; fourthly, a middle longitudinal beam 6 is hoisted, and the middle longitudinal beam 6 is fixedly connected with the top of the middle stand column 5; after the two prefabricated parts designed in the scheme are spliced, the next prefabricated part can be spliced without a certain cooling and stabilizing time, so that the assembling efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of subway construction, and in particular relates to a method for assembling components of a prefabricated station. Background Art

[0002] Prefabricated stations are a new form of prefabricated buildings. Prefabricated stations are to split the station structure into several standard structural rings along the longitudinal direction, and then each ring structure is split into several standard components according to the specific conditions of the project. All these components are centrally produced in the factory, and the prefabricated components are assembled one by one in sequence at the construction site like "building blocks".

[0003] Chinese invention patent CN117027055A discloses a prefabricated subway station middle plate assembly equipment and its construction method. The large-scale movement of the prefabricated subway station middle plate assembly equipment of this scheme is through a mobile trolley. The small-scale longitudinal movement is through an electric mobile bearing platform. Multiple electric hydraulic jacks are used to adjust the vertical movement and flipping of the prefabricated middle plate, and the inclination of the prefabricated middle plate is controlled by the expansion and contraction of the cylinder in different proportions. Each support frame is equipped with a point cloud camera to detect the accuracy of the middle plate during the assembly process. After the prefabricated middle plate is assembled, the distance sensor on the electric sliding frame is used to measure the flatness of the multiple prefabricated middle plates laid from front to back, including the flatness in the length direction of the prefabricated component middle plate. This scheme improves the assembly accuracy of the assembly middle plate, but this assembly method requires the assembly of the previous prefabricated component to be completed before the assembly of the next prefabricated component can be carried out. Since a certain cooling and stabilization time is required after the two prefabricated components are assembled, the construction period is very long, the road time occupied by the construction cannot be shortened, and the safety of the construction is greatly affected.

[0004] Therefore, the present invention provides a method for assembling prefabricated station components, which can shorten the construction period and improve the construction efficiency. Summary of the invention

[0005] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a method for assembling prefabricated station components, which can shorten the construction period and improve the construction efficiency.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for assembling components of a prefabricated station, wherein a cast-in-place base plate 1 is constructed after the foundation pit is excavated, and prefabricated components are assembled after the cast-in-place base plate 1 is constructed, wherein the cast-in-place base plate at least completes the construction of the first eight rings, and specifically comprises the following steps:

[0008] Step 1: The prefabricated components are produced in the factory and transported to the construction site;

[0009] Step 2: construct a finely leveled strip at the bottom of the excavated foundation pit as the assembly base surface of the bottom plate 1 component;

[0010] Step 3: Set up multiple trolleys and cranes, use the crane to hoist the center column 5, temporarily fix the bottom of the center column 5 with bolts, and then use the trolley to adjust the posture of the center column 5 until the positioning is completed;

[0011] Step 4: hoist the middle longitudinal beam 6 and fix the middle longitudinal beam 6 to the top of the middle column 5;

[0012] Step 5: hoist the first ring side wall block 2, place the first ring side wall block 2 on the bottom plate 1, and temporarily fix it, and then fine-tune the position by using a trolley;

[0013] Step 6: Hoist the middle plate assembly trolley and the top plate assembly trolley to the preset designated position, then hoist at least two top plates 3 to the top plate assembly trolley, and align and lock the two top plates 3;

[0014] Step 7: Move the middle plate 4 assembly trolley in step 6 to the next ring position, and transport the middle plate assembly trolley to the preset position of the first ring middle plate 4, and then fix the middle plate 4 to the side wall and the middle longitudinal beam 6 respectively;

[0015] Step 8: Adjust the trolley and move it to the next ring position, assemble the second ring side wall and the second ring top plate 3, then assemble the second ring middle plate 4, and finally fix the middle plate 4 and the middle longitudinal beam 6;

[0016] Step 9: Repeat steps 5 to 8 until all prefabricated components are assembled.

[0017] It is further defined that the invert backfill of the bottom plate 1 is performed after the cast-in-place construction of the cast-in-place bottom plate 1 is completed. In such a structural design, the invert backfill refers to the filling operation of the space below the invert after the bottom plate invert is completed, and its main purpose is to ensure the stability and safety of the bottom plate structure and avoid damage caused by concentrated force on the invert.

[0018] It is further defined that the center column 5 in step 3 is temporarily fixed by a four-way bolt. In such a structural design, the four-way bolt generally refers to a square head bolt, whose head is designed to be square, so that it has a higher tightening torque, better anti-slip performance, higher shear strength and easier operation than ordinary bolts.

[0019] It is further defined that the bottom plate 1 is provided with a plurality of tenon structures, and the first ring side wall block 2 in step 5 is settled on the tenon structure of the bottom plate 1, and is temporarily fixed by the annular pre-tightening device, and then the first ring side wall block 2 is longitudinally pre-tightened by the first ring steel. Such a structural design makes the bottom plate and the side wall block more firmly fixed by setting the annular pre-tightening device, and the tenon structure of the bottom plate 1 also enhances the fastening degree of the side wall block and the bottom plate.

[0020] It is further defined that the pre-tensioning pressure is 250KN to 300KN.

[0021] It is further defined that after the top plate 3 in step six is ​​aligned and locked, a longitudinal pre-tightening device is installed to perform fine position adjustment until the top plate 3 is completely positioned and locked.

[0022] It is further defined that the crane and each trolley are respectively used for hoisting the prefabricated components, and for flipping, hoisting and installing the prefabricated components.

[0023] It is further defined that after assembling four rings of the prefabricated components, the column bottom cup backfilling, joint grouting and waterproofing construction, grouting of the middle plate 4 and the side wall joints and layered backfilling of the side wall fertilizer grooves are carried out in sequence, and the joint grouting is divided into annular joint grouting and longitudinal joint grouting.

[0024] It is further defined that the center longitudinal beam 6 in step 4 is connected to the center column 5 at a vertical angle.

[0025] It is further defined that the top plate 3 in step 6 is also fixedly connected with a top arch member 7, and the top arch member 7 is assembled with the top plate 3 by a trolley, and a lateral limit support is provided during the top plate assembly process. Such a structural design can ensure the stability and accuracy of the top plate member and the top plate by providing a lateral limit support.

[0026] Beneficial effects of the present invention:

[0027] In the assembly construction project of the subway station, this scheme sets the bottom plate, side wall block, top plate, middle plate, central column, middle longitudinal beam and top arch components for each ring. The bottom plate and the side wall block are fixed more firmly by setting the annular pre-tightening device. The stability and integrity of the bottom plate are improved and the waterproof performance is greatly enhanced by joint grouting and waterproof construction, side wall joint grouting and layered backfilling of the side wall fat groove. The top plate, middle plate, central column, middle longitudinal beam and top arch components in the station are all prefabricated components. After the components are assembled, the joint grouting work is started. Through the two methods of annular joint grouting and longitudinal joint grouting, the connection between the components is ensured to be tight and reliable. The operation method of this scheme can shorten the construction period, and the quality of the project will not be reduced. In addition, the two prefabricated components designed in this scheme do not need a certain cooling and stabilization time after assembly before the next prefabricated component can be assembled, which greatly improves the assembly efficiency.

[0028] To sum up, the assembly method of prefabricated station components is a complex and delicate process. This plan strictly operates in accordance with design requirements, construction regulations and safety specifications. Through scientific and reasonable assembly methods and quality control measures, it ensures the structural stability and durability of the prefabricated station, providing strong guarantees for the safe operation of urban rail transit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0030] Figure 1 A flowchart of the steps of an embodiment of a method for assembling components of a prefabricated station according to the present invention;

[0031] Figure 2 The present invention is a structural schematic diagram of an embodiment of a method for assembling prefabricated station components.

[0032] The symbols of the main components are explained as follows: bottom plate 1, first ring side wall block 2, top plate 3, middle plate 4, middle column 5, middle longitudinal beam 6, top arch member 7. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first", "second", etc. in the present invention 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" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] like Figure 1 As shown, a method for assembling components of a prefabricated station of the present invention comprises the following steps: after the foundation pit is excavated, a cast-in-place base plate 1 is constructed, and after the cast-in-place base plate 1 is constructed, the prefabricated components are assembled. The cast-in-place base plate 1 at least completes the construction of the first eight rings.

[0037] Step 1: The prefabricated components are produced in the factory and transported to the construction site;

[0038] Step 2: construct a finely leveled strip at the bottom of the excavated foundation pit as the assembly base surface of the bottom plate 1 component;

[0039] Step 3: Set up multiple trolleys and cranes, use the crane to hoist the center column 5, temporarily fix the bottom of the center column 5 with bolts, and then use the trolley to adjust the posture of the center column 5 until the positioning is completed;

[0040] Step 4: hoist the middle longitudinal beam 6, and fix the middle longitudinal beam 6 and the top of the middle column 5 with high-strength bolts;

[0041] Step 5: hoist the first ring side wall block 2, place the first ring side wall block 2 on the bottom plate 1, and temporarily fix it, and then fine-tune the position by using a trolley;

[0042] Step 6: Hoist the middle plate assembly trolley and the top plate assembly trolley to the preset designated position, then hoist at least two top plates 3 to the top plate assembly trolley, and align and lock the two top plates 3;

[0043] Step 7: Move the middle plate assembly trolley in step 6 to the next ring position, transport the middle plate assembly trolley to the preset position of the first ring middle plate 4, and then fix the middle plate 4 to the side wall and the middle longitudinal beam 6 respectively by high-strength bolts;

[0044] Step 8: Adjust the trolley and move it to the next ring position, assemble the second ring side wall and the second ring top plate 3, then assemble the second ring middle plate 4, and finally fix the middle plate 4 and the middle longitudinal beam 6 with high-strength bolts;

[0045] Step 9: Repeat steps 5 to 8 until all prefabricated components are assembled.

[0046] The foundation pit excavation process of this scheme is as follows:

[0047] (1) Earthwork excavation: During earthwork excavation, the principle of "vertical stratification, longitudinal segmentation, and central grooving" should be followed. At the same time, it should be noted that during the excavation process, the excavation surface should be flat and rounded to avoid under-excavation or over-excavation;

[0048] (2) Measurement and positioning and elevation control: Detailed measurement and positioning are required before excavation;

[0049] (3) Selection of foundation pit support. Foundation pit support usually includes reinforced concrete support system and steel structure support system. Among them, the steel structure support system is widely used in the construction of prefabricated stations due to its advantages such as light weight, convenient installation and reusability. This scheme selects a steel structure support system, which includes a circular tube-shaped sleeve with two nuts welded at both ends of the sleeve and a support rod installed. A pad is set at the end of the support rod to reduce the pressure on the pipe segment and the side wall of the foundation pit. By rotating the sleeve, the length of the support assembly can be adjusted so that its two ends support the structure and the side wall of the foundation pit respectively.

[0050] (4) Install a reaction device, which acts as a fulcrum tension reaction force.

[0051] (5) After installing the support assembly and reaction device, the support system needs to be adjusted to ensure its stability and safety.

[0052] After completing the above construction, a fine-leveling strip is constructed at the bottom of the foundation pit, and the width of the fine-leveling strip is at least 2m wide.

[0053] Preferably, the invert backfill of the bottom plate 1 is performed after the cast-in-place construction of the cast-in-place bottom plate 1 is completed. In such a structural design, the invert backfill refers to the filling operation of the space below the invert after the bottom plate invert is completed, and its main purpose is to ensure the stability and safety of the bottom plate 1 structure and avoid damage caused by concentrated force on the invert.

[0054] Preferably, the center column 5 in step 3 is temporarily fixed with a four-way bolt. In such a structural design, the four-way bolt generally refers to a square head bolt, whose head is designed to be square, so that it has a higher tightening torque, better anti-slip performance, higher shear strength and easier operation than ordinary bolts.

[0055] Preferably, the bottom plate 1 is provided with a plurality of tenon structures, and the first ring side wall block 2 in step 5 is settled on the tenon structure of the bottom plate 1, and is temporarily fixed by the annular pre-tightening device, and then the first ring side wall block 2 is longitudinally pre-tightened by the first ring steel. Such a structural design makes the bottom plate 1 and the side wall block more firmly fixed by providing the annular pre-tightening device, and the tenon structure of the bottom plate 1 also enhances the fastening degree between the side wall block and the bottom plate.

[0056] Preferably, the pre-tensioning pressure is 250KN to 300KN.

[0057] Preferably, after the top plate 3 is aligned and locked in step six, a longitudinal pre-tightening device is installed to perform fine position adjustment until the top plate 3 is completely positioned and locked.

[0058] Preferably, the crane and each trolley are used to hoist the prefabricated components, and to flip, hoist and install the prefabricated components.

[0059] Preferably, after assembling four rings of the prefabricated components, the column bottom cup backfilling, joint grouting and waterproofing construction, the middle plate 4 and the side wall joint grouting and the side wall fat groove layered backfilling are carried out in sequence. The joint grouting is divided into annular joint grouting and longitudinal joint grouting.

[0060] Preferably, the center longitudinal beam 6 in step 4 is connected to the center column 5 at a vertical angle.

[0061] Preferably, the top plate 3 in step 6 is also fixedly connected with a top arch member 7 by high-strength bolts, and the top arch member 7 is assembled with the top plate 3 by a trolley, and a lateral limit support is provided during the assembly process of the top plate 3. Such a structural design can ensure the stability and accuracy of the top plate member and the top plate 3 by providing a lateral limit support.

[0062] This embodiment provides a method for assembling prefabricated station components, and its process flow is as follows:

[0063] Excavate foundation pit → construct cast-in-place bottom plate → transport all prefabricated components to the construction site → construct fine-leveling strips → set the crane and trolley to the designated position → hoist the center column 5 → bolt the center column 5 → hoist the center longitudinal beam 6 → bolt the center longitudinal beam 6 to the center column 5 → hoist the first ring side wall block 2 → fix the first ring side wall block 2 to the bottom plate → hoist the two top plates 3 to the designated position → align and lock the two top plates 3 → move the trolley to the next ring → the first ring middle plate 4 is at the preset position → the middle plate 4 is fixed to the side wall and the middle longitudinal beam 6 respectively → move the trolley to the next ring → assemble the second ring side wall and the second ring top plate 3 → assemble the second ring middle plate 4 → fix the middle plate 4 and the middle longitudinal beam 6 → repeat the above steps → finally assemble the platform plate.

[0064] The hoisting process of the base plate 1 in this embodiment is as follows:

[0065] (1) Prepare lifting equipment such as gantry cranes, lifting rigging, jacks, as well as auxiliary equipment such as measuring tools and adjustment tools.

[0066] (2) Before lifting, the station axis and the edge position of the bottom plate components need to be drawn on the foundation surface to ensure that the bottom plate 1 can be accurately lifted to the predetermined position. During the lifting process, the bottom plate components are manually aligned with the gantry crane. If there is any deviation during the alignment process, a jack is used for fine adjustment.

[0067] (3) Use a gantry crane to lift the bottom plate 1 and slowly move it to the designed position of the foundation surface. During the lifting process, the stability and balance of the components need to be maintained to avoid collision and damage.

[0068] (4) After the base plate 1 is hoisted to the predetermined position, the component is precisely positioned using adjustment tools such as a jack. During the positioning process, it is necessary to ensure that the component is in close contact with the foundation surface.

[0069] (5) After the base plate components are in place, they are assembled according to the design requirements. After the base plate 1 is assembled, grouting and filling work is carried out. The grouting material is high-strength non-shrinkage cement mortar, and the grouting equipment is a professional grouting pump. The filling material should be a high-strength material that matches the components to ensure that the filling is dense and free of gaps.

[0070] (6) After grouting and filling, the components need to be fixed and inspected. The fixing method is to use nut locking and other methods to ensure that the connection between the components is stable and reliable.

[0071] The hoisting process of the first ring side wall block 2 of this embodiment is as follows:

[0072] (1) Select appropriate lifting tools according to the weight and size of the first ring side wall block 2. In this solution, the angle between the first ring side wall block 2 and the lifting rope is less than 45 degrees, and there are multiple lifting points on the first ring side wall block 2. Therefore, this solution adopts steel beam lifting or multi-point lifting.

[0073] (2) Use the main hook and auxiliary hook (if necessary) of the crane to hook and ensure that the sling is firmly connected to the lifting point of the first ring side wall block 2. Before lifting, check whether the component is horizontal and whether the force at each lifting point is uniform.

[0074] (3) Lift the first ring side wall block 2 from the stacking area and slowly move it to the lifting position. During the lifting process, the stability and balance of the component must be maintained to avoid collision and damage.

[0075] (4) Stop descending when it reaches a certain height (50cm in this solution) from the installation position, and check whether the installation direction of the side wall block is consistent with the design requirements. Adjust the position of the side wall block according to the side line and end line of the foundation so that it is accurately in place. Use measuring tools to check the verticality and horizontality of the side wall block to ensure that it meets the design requirements.

[0076] The following steps are adopted in the subsequent steps: set the crane and the trolley to the specified position → lift the center column 5 → bolt the center column 5 → lift the center longitudinal beam 6 → fix the center longitudinal beam 6 and the center column 5 with bolts → lift the first ring side wall block 2 → fix the first ring side wall block 2 to the bottom plate → lift the two top plates 3 to the specified position → align and lock the two top plates 3 → move the trolley to the next ring → the first ring middle plate 4 is at the preset position → the middle plate 4 is fixed to the side wall and the center longitudinal beam 6 respectively.

[0077] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for assembling components of a prefabricated station, characterized in that: After the foundation pit is excavated, the cast-in-place base plate (1) is constructed. After the cast-in-place base plate (1) is constructed, the prefabricated components are assembled. The cast-in-place base plate at least completes the construction of the first eight rings, which specifically includes the following steps: Step 1: The prefabricated components are produced in the factory and transported to the construction site; Step 2: construct a finely leveled strip at the bottom of the excavated foundation pit to serve as the assembly base surface for the bottom plate (1) components; Step 3: multiple trolleys and cranes are set up, the center column (5) is hoisted by the crane, the bottom of the center column (5) is temporarily fixed by bolts, and the posture of the center column (5) is adjusted by the trolley until the positioning is completed; Step 4: hoisting the middle longitudinal beam (6), and fixing the middle longitudinal beam (6) to the top of the middle column (5); Step 5: hoist the first ring side wall block (2), place the first ring side wall block (2) on the bottom plate (1), and temporarily fix it, and then fine-tune the position by using a trolley; Step 6: hoist the middle plate assembly trolley and the top plate assembly trolley to the preset designated position, then hoist at least two top plates (3) to the top plate assembly trolley, and align and lock the two top plates (3); Step 7: Move the middle plate (4) assembly trolley of step 6 to the next ring position, transport the middle plate assembly trolley to the preset position of the first ring middle plate (4), and then fix the middle plate (4) to the side wall and the middle longitudinal beam (6) respectively; Step 8: Adjust the trolley and move it to the next ring position, assemble the second ring side wall and the second ring top plate (3), then assemble the second ring middle plate (4), and finally fix the middle plate (4) and the middle longitudinal beam (6) together; Step 9: Repeat steps 5 to 8 until all prefabricated components are assembled.

2. A method for assembling components of a prefabricated station according to claim 1, characterized in that: After the cast-in-place construction of the cast-in-place bottom plate (1) is completed, the bottom plate (1) is backfilled.

3. The method for assembling components of a prefabricated station according to claim 1, characterized in that: The center column (5) in step three is temporarily fixed by using four-way bolts.

4. The method for assembling components of a prefabricated station according to claim 1, characterized in that: The base plate (1) is provided with a plurality of tenon structures, and the first ring side wall block (2) in step 5 is settled on the tenon structure of the base plate (1), and is temporarily fixed by a circumferential pre-tightening device, and then the first ring side wall block (2) is longitudinally pre-tightened by the first ring steel.

5. The method for assembling components of a prefabricated station according to claim 4, characterized in that: The pre-tensioning pressure is 250KN to 300KN.

6. The method for assembling components of a prefabricated station according to claim 1, characterized in that: After the top plate (3) in step six is ​​aligned and locked, a longitudinal pre-tightening device is installed to perform fine position adjustment until the top plate (3) is completely positioned and locked.

7. The method for assembling components of a prefabricated station according to claim 1, characterized in that: The crane and each trolley are used for hoisting the prefabricated components, and for turning over, hoisting and installing the prefabricated components.

8. The method for assembling components of a prefabricated station according to claim 1, characterized in that: After assembling four rings of the prefabricated components, the column bottom cup backfilling, joint grouting and waterproofing construction, middle plate (4) and side wall joint grouting and side wall fat groove layered backfilling are carried out in sequence. The joint grouting is divided into annular joint grouting and longitudinal joint grouting.

9. The method for assembling components of a prefabricated station according to claim 1, characterized in that: The middle longitudinal beam (6) in step 4 is connected to the middle column (5) at a vertical angle.

10. The method for assembling components of a prefabricated station according to claim 1, characterized in that: The top plate (3) in step six is ​​also fixedly connected with a top arch component (7), and the top arch component (7) is assembled with the top plate (3) by a trolley. During the top plate assembly process, a lateral limit support is provided.

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