An assembled subway station track bottom air duct side wall splicing structure and construction method

Abstract

An assembled subway station track bottom air duct side wall splicing structure and construction method, comprising a prefabricated beam, a prefabricated column and a prefabricated wall, a single prefabricated beam, a prefabricated column and a prefabricated wall constitute a standard section, the single prefabricated beam is provided with a reserved bolt hole at one side of the beam end, the prefabricated column is provided with a pre-buried bolt at the top of the column, the pre-buried bolt at the top of the prefabricated column is matched with the reserved hole of the prefabricated beam, and the size and shape are consistent, the bottom of the prefabricated column is connected with a foundation bottom plate through a chemical anchor bolt, and the prefabricated wall is sealed at the joint with the foundation bottom plate by using cement mortar.The assembled splicing structure reduces on-site pouring, eliminates the construction process of formwork, improves the working environment, greatly shortens the construction period, reduces the amount of steel bars and concrete, is low-carbon and environmentally friendly, and has high economic and social benefits.

Description

Technical Field

[0001] This invention relates to the field of subway station track bottom ventilation duct technology, and in particular to a prefabricated subway station track bottom ventilation duct side wall splicing structure and construction method. Background Technology

[0002] Compared to traditional cast-in-place construction techniques, prefabricated construction technology has rapidly developed and been widely applied in the rail transit sector due to its advantages such as speed, efficiency, and low energy consumption. Several prefabricated metro stations, such as the Xihu Station on Changchun Metro Line 2, have been built and put into operation in China. However, these stations mostly feature prefabricated main structures and cast-in-place auxiliary structures. As a crucial auxiliary structural system for metro stations—the platform slab system—traditional cast-in-place reinforced concrete rail-bottom ventilation duct sidewalls are quite thick, requiring a large amount of reinforced concrete. On-site formwork is also necessary, and the wall reinforcement needs to be inserted into the foundation slab, involving drilling and rebar installation processes. This results in overlapping processes, material waste, and long construction cycles. Therefore, a prefabricated rail-bottom ventilation duct sidewall splicing structure needs to be designed. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a prefabricated subway station track bottom ventilation duct sidewall splicing structure. This structure enables less on-site casting, rapid assembly, and also saves a significant amount of materials.

[0004] The technical solution adopted in this invention:

[0005] A prefabricated subway station track bottom ventilation duct side wall splicing structure includes precast beams, precast columns, and precast walls. Each precast beam, precast column, and precast wall forms a standard section. Bolt holes are reserved on one side of the precast beam, and precast bolts are pre-embedded on the top of the precast column. The pre-embedded bolts on the top of the precast column are compatible with the reserved holes in the precast beam, and their size and shape match. The bottom of the precast column is connected to the foundation plate through chemical anchors, and the joint between the precast wall and the foundation plate is sealed with cement mortar.

[0006] The precast wall is equipped with a single-layer bidirectional steel mesh, wherein the longitudinal steel bars are not exposed at the bottom and are anchored into the precast beam at the top, and the horizontal steel bars are not exposed on the right side and are anchored into the precast column on the left side.

[0007] Before the precast beam is poured, a PVC sleeve I is pre-embedded at one end of the precast beam to form a bolt hole for the pre-embedded bolts at the top of the precast column in the next standard section to pass through.

[0008] Before the precast column is poured, pre-embedded bolts are installed at the column base of the precast column, PVC sleeve II is pre-embedded at the bottom of the precast column, and a reserved opening is formed at the bottom of the precast column.

[0009] Before connecting the base of the precast column to the foundation slab, the foundation slab is first drilled on-site for positioning. The drilling position should match the position of the reserved hole at the base of the precast column. A glass tube containing chemical agent is placed in the hole of the foundation slab, and the lower part of the chemical anchor is inserted into the reserved hole of the foundation slab and tightened with a nut on the top of the chemical anchor.

[0010] After the pre-embedded bolts of the precast column pass through the reserved holes in the precast beam, the opening is initially sealed with cement mortar, and then tightened with nuts.

[0011] A construction method for a prefabricated subway station track bottom ventilation duct sidewall splicing structure, the steps of which are as follows:

[0012] S1. Before the factory prefabricates a single standard section, the reserved openings and embedded PVC sleeves of the prefabricated beams are precisely positioned, and the specifications of PVC sleeve I are determined according to the diameter of the embedded bolts of the prefabricated column.

[0013] S2. For factory-prefabricated components, before pouring concrete, determine the specifications and embedment depth of the pre-embedded bolts on the top of the prefabricated column and perform precise positioning;

[0014] S3. For factory-prefabricated components, before pouring concrete, determine the size of the reserved opening at the bottom of the prefabricated column and the specifications of the pre-embedded PVC sleeve II, and accurately position it.

[0015] S4. Tie the reinforcing bars of a single standard section. When encountering openings where the reinforcing bars collide with the openings, bend the reinforcing bars to avoid them. Finally, pour concrete.

[0016] S5. Transport the prefabricated standard sections from the factory to the site;

[0017] S6. Clean and level the foundation slab that has been poured. Locate the places where holes need to be drilled in the foundation slab according to the pre-reserved openings at the connection between the precast columns and the foundation slab in the standard section. Drill holes on site after positioning. Clean the holes in the foundation slab after drilling and then put in chemical agents.

[0018] S7. Move a single standard section A onto the foundation plate, match the precast column with the drilling position of the foundation plate, insert chemical anchors after matching, insert them with an electric drill until the bottom of the hole, crush the chemical agent glass tube placed in the foundation plate to let the chemical agent gel in the glass tube flow out, remove the installation fixture and wait for the gel to completely solidify.

[0019] S8. The joint between the precast wall and the foundation slab shall be sealed with cement mortar to ensure airtightness;

[0020] S9. Clean and level the concrete surface of the top of the precast column of standard section A and the concrete bottom surface of the precast beam of the next standard section B to be assembled;

[0021] S10. After the cleaning and leveling are completed, hoist standard section B to the left side of standard section A, ensuring that the pre-embedded bolts on the top of the precast column of standard section A pass through the reserved opening of the precast beam of standard section B. At the same time, install a sealing strip on the right side of the precast wall of standard section B. The connection between standard section B and the foundation plate is the same as the installation process of standard section A.

[0022] S11. After the precast wall and precast column of standard section B are installed and fixed, the connection between the precast column of standard section A and the precast beam of standard section B is treated. The holes of the precast beam through which the embedded bolts pass are grouted for the first time. Then tighten the nuts and grout again. The nuts and holes are sealed and leveled.

[0023] S12. For the contact surfaces where there are still gaps after the splicing of precast columns and precast beams, use modified epoxy resin repair adhesive to seal and reinforce them. After reinforcement, fill the construction joint between the standard section AB precast beams with cement mortar.

[0024] The beneficial effects of this invention are as follows: The prefabricated splicing structure of this invention reduces on-site pouring, eliminates the formwork construction process, improves the working environment, greatly shortens the construction period, and at the same time reduces the amount of steel bars and concrete used, making it low-carbon and environmentally friendly, and has high economic and social benefits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a single standard section structure of the present invention.

[0026] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0027] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0028] Figure 4 This is a schematic diagram showing the connection between the precast column and the foundation slab.

[0029] Wherein: 1-Precast wall; 2-Precast beam; 3-Precast column; 4-Embedded bolt; 5-PVC sleeve I; 6-Nut; 7-PVC sleeve II; 8-Chemical agent; 9-Chemical anchor; 10-Foundation slab. Detailed Implementation

[0030] A prefabricated subway station track bottom ventilation duct side wall splicing structure includes precast beams 2, precast columns 3, and precast walls 1. Each precast beam 2, precast column 3, and precast wall 1 forms a standard section. A bolt hole is reserved on one side of the precast beam 1. A precast bolt 4 is pre-embedded on the top of the precast column 3. The precast bolt 4 on the top of the precast column 3 is compatible with the reserved hole of the precast beam 2 in size and shape. The bottom of the precast column 3 is connected to the foundation plate 10 through chemical anchors 9. The joint between the precast wall 1 and the foundation plate is sealed with cement mortar.

[0031] The precast wall 1 is equipped with a single-layer bidirectional steel mesh, wherein the longitudinal steel bars are not exposed at the bottom and are anchored into the precast beam 2 at the top, and the anchorage length is required to meet the basic anchorage length. The horizontal steel bars are not exposed on the right side and are anchored into the precast column 3 on the left side, and the anchorage length is required to meet the basic anchorage length. After the steel bars are tied, the precast beam 2, the precast column 3 and the precast wall 1 are cast as a whole to form a standard section.

[0032] Before casting, a PVC sleeve I5 is pre-embedded at one end of the precast beam 2 to form a bolt hole for the pre-embedded bolt 4 at the top of the precast column 3 in the next standard section to pass through.

[0033] Before the precast column 3 is poured, pre-embedded bolts 4 are installed at the column base of the precast column 3, PVC sleeves II7 are pre-embedded at the bottom of the precast column 3, and a reserved opening is formed at the bottom of the precast column 3.

[0034] Before connecting the base of the precast column 3 to the foundation slab 10, the foundation slab 10 is first drilled on-site for positioning. The drilling position should match the position of the reserved hole at the base of the precast column 3. After drilling, the hole in the foundation slab 10 is cleaned. A glass tube containing chemical agent 8 is placed in the hole in the foundation slab 10. After the precast column 3 is positioned and confirmed, the lower part of the chemical anchor 9 is inserted into the reserved hole in the foundation slab 10 and tightened with nut 6 on the top of the chemical anchor 9. The chemical anchor 9 passes through the precast column 3 and is driven into the hole in which the glass tube containing chemical agent 8 has been placed. Nut 6 is tightened. After the chemical agent 8 expands and solidifies, the connection with the foundation slab 10 is completed.

[0035] After the pre-embedded bolts 4 of the precast column 3 pass through the reserved holes of the precast beam 2, the concrete contact surfaces of the precast column 3 and the precast beam 2 are leveled and cleaned before the column top is connected. After the cleaning is complete, one standard section is hoisted to the side of another standard section, and the opening is initially sealed with cement mortar. After sealing, the nuts 6 are tightened. Finally, the nuts 6 are sealed and leveled with cement mortar.

[0036] A construction method for a prefabricated subway station track bottom ventilation duct sidewall splicing structure, the steps of which are as follows:

[0037] S1. Before the factory prefabricates a single standard section, the reserved openings and embedded PVC sleeves I5 of the prefabricated beam 2 are precisely positioned, and the specifications of the PVC sleeves 5 are determined according to the diameter of the embedded bolts 4 of the prefabricated column 3.

[0038] S2. For factory-prefabricated components, before pouring concrete, determine the specifications and embedment depth of the pre-embedded bolts 4 on the top of the prefabricated column 3, and perform precise positioning;

[0039] S3. Factory prefabricated components: Before pouring concrete, determine the size of the reserved opening at the bottom of the prefabricated column 3 and the specifications of the pre-embedded PVC sleeve II7 and perform precise positioning.

[0040] S4. Tie the reinforcing bars of a single standard section. When encountering openings where the reinforcing bars collide with the openings, bend the reinforcing bars to avoid them. Finally, pour concrete.

[0041] S5. Transport the prefabricated standard sections from the factory to the site;

[0042] S6. Clean and level the foundation slab 10 that has been poured. Locate the places where drilling is required in the foundation slab 10 according to the reserved openings at the connection between the precast column 3 and the foundation slab 10 in the standard section. Drill holes on site after positioning. Clean the holes in the foundation slab 10 after drilling. Then put in chemical agent 8.

[0043] S7. Move a single standard section A onto the foundation plate 10, match the precast column 3 with the drilling position of the foundation plate 10, insert the chemical anchor 9 after matching, insert it with an electric drill until the bottom of the hole, crush the glass tube of chemical agent 8 placed in the foundation plate 10, let the chemical agent 8 gel in the glass tube flow out, remove the installation fixture and wait for the gel to completely solidify.

[0044] S8. The joint between the precast wall 1 and the foundation slab 10 shall be sealed with cement mortar to ensure airtightness;

[0045] S9. Clean and level the concrete surface of the top of the precast column 3 of standard section A and the concrete bottom surface of the precast beam 2 of the next standard section B for assembly;

[0046] S10. After the cleaning and leveling are completed, hoist standard section B to the left side of standard section A, ensuring that the pre-embedded bolts 4 on the top of the precast column 3 of standard section A pass through the reserved opening of the precast beam 2 of standard section B. At the same time, set a sealing strip on the right side of the precast wall 1 of standard section B. The connection between standard section B and the foundation plate 10 is the same as the installation process of standard section A.

[0047] S11. After the precast wall 1 and precast column 3 of standard section B are installed and fixed, the connection between the precast column 3 of standard section A and the precast beam 2 of standard section B is treated. The holes through which the precast bolts 4 pass are grouted for the first time. Then tighten the nuts 6 and grouted again. The nuts 6 and the holes are sealed and leveled.

[0048] S12. For the contact surfaces where there are still gaps after the precast column 3 and precast beam 2 are spliced, modified epoxy resin repair adhesive is used for sealing and reinforcement. After reinforcement, the construction joint between the standard section AB precast beam 2 is filled with cement mortar.

[0049] This embodiment is used for the side wall structure of the air duct under the subway station, which can achieve rapid on-site assembly. Only a small amount of cement mortar needs to be poured during the assembly process, which shortens the construction period, reduces labor, and is low-carbon and environmentally friendly.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A prefabricated subway station track bottom ventilation duct sidewall splicing structure, characterized in that, It includes precast beams (2), precast columns (3) and precast walls (1). A single precast beam (2), precast column (3) and precast wall (1) form a standard section. The precast beam (2) has a bolt hole reserved on one side of the beam end. The precast column (3) has a pre-embedded bolt (4) on the top of the column. The pre-embedded bolt (4) on the top of the precast column (3) is compatible with the reserved hole of the precast beam (2) and the size and shape match. The bottom of the precast column (3) is connected to the foundation plate (10) through chemical anchors (9). The joint between the precast wall (1) and the foundation plate is sealed with cement mortar. The precast wall (1) is provided with a single layer of bidirectional steel mesh, wherein the longitudinal steel bars are not exposed at the bottom and are anchored into the precast beam (2) at the top, and the horizontal steel bars are not exposed on the right side and are anchored into the precast column (3) on the left side. Before the precast beam (2) is poured, a PVC sleeve I (5) is pre-embedded at one end of the precast beam (2) to form a bolt hole for the pre-embedded bolt (4) at the top of the precast column (3) in the next standard section to pass through.

2. The prefabricated subway station track bottom ventilation duct sidewall splicing structure according to claim 1, characterized in that, Before the precast column (3) is poured, a pre-embedded bolt (4) is set at the top of the precast column (3), a PVC sleeve II (7) is pre-embedded at the bottom of the precast column (3), and a reserved opening is formed at the bottom of the precast column (3).

3. The prefabricated subway station track bottom ventilation duct sidewall splicing structure according to claim 2, characterized in that, Before connecting the bottom of the precast column (3) to the foundation slab (10), the foundation slab (10) is first positioned and drilled on site. The drilling position should match the reserved opening position at the bottom of the precast column (3). A glass tube containing chemical agent (8) is placed in the hole of the foundation slab (10). The lower part of the chemical anchor (9) is inserted into the hole of the foundation slab (10) and tightened with nut (6) on the top of the chemical anchor (9).

4. The prefabricated subway station track bottom ventilation duct sidewall splicing structure according to claim 3, characterized in that, After the pre-embedded bolts (4) of the precast column (3) pass through the bolt holes reserved in the precast beam (2), the holes are initially sealed with cement mortar, and then tightened with nuts (6).

5. The construction method of the prefabricated subway station track bottom ventilation duct sidewall splicing structure according to claim 4, characterized in that, The steps are as follows: S1. Before the factory prefabricates a single standard section, the reserved bolt holes and the embedded PVC sleeve I (5) of the prefabricated beam (2) are precisely positioned, and the specifications of the PVC sleeve I (5) are determined according to the diameter of the embedded bolt (4) of the prefabricated column (3). S2. Factory prefabricated components, before pouring concrete, determine the specifications and embedment depth of the prefabricated column (3) column top pre-embedded bolts (4) and perform precise positioning; S3. Factory prefabricated components, before pouring concrete, determine the size of the reserved opening at the bottom of the prefabricated column (3) and the specifications of the pre-embedded PVC sleeve II (7) and make precise positioning; S4. Tie the reinforcing bars of a single standard section. When encountering openings where the reinforcing bars collide with the openings, bend the reinforcing bars to avoid them. Finally, pour concrete. S5. Transport the prefabricated standard sections from the factory to the site; S6. Clean and level the foundation slab (10) that has been poured. According to the reserved opening at the connection between the precast column (3) and the foundation slab (10) in the standard section, locate the places where the foundation slab (10) needs to be drilled. After positioning, drill on site. After drilling, clean the holes in the foundation slab (10) and then put in chemical agent (8). S7. Move a single standard section A onto the foundation plate (10), match the precast column (3) with the drilling position of the foundation plate (10), and after matching, insert the chemical anchor (9) and insert it with an electric drill until the bottom of the hole. Crush the glass tube of chemical agent (8) placed in the foundation plate (10) to let the chemical agent (8) gel in the glass tube flow out. After removing the installation fixture, wait for the gel to completely solidify. S8. The joint between the precast wall (1) and the foundation slab (10) is sealed with cement mortar to ensure airtightness; S9. Clean and level the concrete surface of the top of the precast column (3) of standard section A and the concrete bottom of the precast beam (2) of the next standard section B to be assembled; S10. After the cleaning and leveling are completed, hoist the standard section B to the left side of the standard section A, ensuring that the pre-embedded bolts (4) on the top of the precast column (3) of the standard section A pass through the reserved opening of the precast beam (2) of the standard section B. At the same time, set a sealing strip on the right side of the precast wall (1) of the standard section B. The connection between the standard section B and the foundation plate (10) repeats the installation process of the standard section A. S11. After the precast wall (1) and precast column (3) of standard section B are installed and fixed, the connection between the precast column (3) of standard section A and the precast beam (2) of standard section B is treated. The holes of the precast beam (2) through which the embedded bolts (4) pass are grouted for the first time. Then tighten the nuts (6) and groute again. The nuts (6) and holes are sealed and leveled. S12. For the contact surfaces where there are still gaps after the precast columns (3) and precast beams (2) are spliced, modified epoxy resin repair adhesive is used for sealing and reinforcement. After reinforcement, the construction joint between the standard sections A and B precast beams (2) is filled with cement mortar.

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