Accurate positioning construction system and method for fabricated rail top air duct

Abstract

The invention discloses a precise positioning construction system for an assembly type rail top air duct, which comprises a rail top air duct fixedly mounted below a cast-in-place middle plate through an embedded part, and is characterized by further comprising a head-section cast-in-place middle plate, a tail-section cast-in-place middle plate, a bridging rail, an embedded part and a positioning assembly, the bridging track is laid along the trend of the track top air duct, and two ends of the bridging track are respectively fixed on the top surfaces of the head-section cast-in-place middle plate and the tail-section cast-in-place middle plate; the embedded parts are synchronously and sequentially arranged on the reinforcement cage in the corresponding area of each pouring section along with section-by-section pouring of the cast-in-place middle plate; the positioning assembly can slide on the bridging track so as to synchronously follow section-by-section pouring of the cast-in-place middle plate and position the embedded parts in the areas corresponding to the pouring sections. The problems that when a cast-in-place middle plate is poured, the installation precision of an embedded part is affected by walking disturbance of a construction worker and concrete pouring impact easily, and the installation requirement of a later assembly type rail top air duct cannot be met are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail transportation engineering, and in particular relates to a precise positioning construction system and a construction method for an assembled rail-top air duct. Background Art

[0002] Prefabricated buildings are structures assembled on-site from prefabricated components. The development of prefabricated buildings represents a significant shift in construction methods, contributing to resource conservation and energy conservation, reducing construction pollution, improving labor productivity and quality and safety, and contributing to the reduction of overcapacity. Despite recent efforts to explore the development of prefabricated buildings, on-site casting remains the primary method of construction. This is particularly true in subway station construction, where the proportion and scale of prefabricated construction remain relatively low, significantly lagging behind the requirements for green building development and the application of advanced construction technologies.

[0003] Due to factors such as engineering geology and industrial scale, prefabricated concrete construction technology is rarely used in underground rail transit stations. While some areas in China have successfully experimented with prefabricated construction technology for subway stations, this approach is limited to the primary structure. Secondary structures such as platform slabs, trackside air ducts, stairways, and equipment mezzanines within the station are limited by their thinness, the difficulty of hoisting components within the semi-enclosed space of the subway station, and the difficulty of horizontal transportation. Consequently, these secondary structures are primarily connected to the main station structure using pre-reinforced steel bars.

[0004] At present, the secondary structure assembly technology of subway stations is also gradually developing. The assembled structure needs to reserve embedded parts in the cast-in-place structure for the installation of later assembled components. The installation method of embedded parts still adopts the traditional method of directly fixing them to the structural steel bars. The installation accuracy of this method is easily affected by the walking disturbance of construction workers, the impact of concrete pouring, and the displacement of structural steel bars, resulting in the installation accuracy unable to meet the installation requirements of later assembled components. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to provide a precise positioning construction system and construction method for an assembled rail-top air duct, aiming to solve the problem that when casting the cast-in-place middle plate, the embedded parts are easily disturbed by the walking of construction workers and the impact of concrete pouring, which affects the installation accuracy and cannot meet the later installation requirements of the assembled rail-top air duct.

[0006] The present invention is achieved through the following technical solutions.

[0007] In a first aspect, the present invention provides a precise positioning construction system for an assembled rail-top air duct, comprising a rail-top air duct fixedly installed below a cast-in-place middle plate via embedded parts, characterized in that it also includes:

[0008] The first section of cast-in-place middle slab;

[0009] Cast-in-place middle plate at the end section;

[0010] The bridge rail is laid along the direction of the air duct on the top of the rail, and its two ends are respectively fixed to the top surface of the first section cast-in-place middle plate and the last section cast-in-place middle plate;

[0011] Embedded parts, which are synchronously followed by the segmented pouring of the cast-in-situ middle plate and are sequentially arranged on the steel skeleton in the corresponding area of ​​each pouring segment;

[0012] A positioning assembly can slide on the bridging track to synchronously follow the segmented pouring of the cast-in-place middle plate and position the embedded parts in the corresponding area of ​​each pouring segment.

[0013] Preferably, the embedded parts include:

[0014] Embedded steel plate;

[0015] The top of the embedded steel casing passes through the embedded steel plate.

[0016] Preferably, the embedded part further includes:

[0017] A grouting conduit connected to one side of the bottom of the embedded steel casing;

[0018] An exhaust duct connected to one side of the top of the embedded steel casing.

[0019] Preferably, the positioning component includes:

[0020] Positioning frame;

[0021] A pulley is provided at the bottom of the positioning frame and can be embedded in the bridge track and slide freely along the bridge track;

[0022] Several segment positioning sleeves are fixed to the front end of the positioning frame and are arranged in one-to-one correspondence with all the embedded steel sleeves in the next segment to be cast;

[0023] Several inter-segment positioning sleeves are fixed at the rear end of the positioning frame and are arranged one by one corresponding to some pre-buried steel sleeves in the previous cast section;

[0024] From top to bottom, several positioning rods are plugged into and matched with the intra-segment positioning sleeves or inter-segment positioning sleeves, as well as the embedded steel sleeves at the corresponding positions.

[0025] Preferably, the positioning component further includes:

[0026] A locking bolt is provided on one side of the intra-segment positioning sleeve or the inter-segment positioning sleeve to fix the positioning rod inserted into the intra-segment positioning sleeve or the inter-segment positioning sleeve;

[0027] A limiting piece is provided on the top of the positioning rod.

[0028] Preferably, the positioning component further includes:

[0029] A leveler, which can be telescopically adjusted in height, is disposed at the four corner ends of the bottom of the positioning frame, with the upper end of the leveler fixedly connected to the bottom of the positioning frame and the lower end abutting against the bridge rail;

[0030] A bubble level gauge is arranged at the top center of the positioning frame.

[0031] Preferably, the positioning frame includes:

[0032] A plurality of positioning longitudinal beams, wherein the number and spacing of the positioning longitudinal beams are the same as the number and spacing of the longitudinal rows of embedded parts;

[0033] A transverse support plate, the transverse support plate is connected between the bottoms of a plurality of positioning longitudinal beams, and the pulley is arranged at the bottom of the transverse support plate;

[0034] A connecting beam is provided, wherein the connecting beam is connected between the tops of the plurality of positioning longitudinal beams.

[0035] Preferably, the inner diameters of the intra-segment positioning sleeves, the inter-segment positioning sleeves and the embedded steel sleeves are the same, and the diameter of the positioning rods is slightly smaller than the inner diameter of the embedded steel sleeves.

[0036] Preferably, the rail top air duct is formed by sequentially splicing together a number of air duct prefabricated bodies, the top of the air duct prefabricated body is connected with a hanging rod, the hanging rod passes through the embedded steel casing upward and extends to the top surface of the cast-in-place middle plate and is threadedly connected to the hanging piece.

[0037] In a second aspect, the present invention provides a method for accurately positioning and constructing an assembled rail-top air duct, characterized in that it comprises the following steps:

[0038] S1. Support the formwork and construct the steel frame at the location of the first and last cast-in-place middle plates, install embedded parts on the steel frame, and then cast the first and last cast-in-place middle plates;

[0039] S2. After the concrete of the first and last cast-in-place middle plates have finally set, install a bridge track between the top surfaces of the first and last cast-in-place middle plates along the designed direction of the rail top air duct, and hoist the positioning assembly to install it on the bridge track.

[0040] S3, starting with the first section of cast-in-place middle plate 2, supporting the formwork and constructing the steel skeleton in the next section to be cast, adjusting the position of the positioning assembly by moving the pulley so that the inter-segment positioning sleeves are aligned with the corresponding embedded steel sleeves in the previous cast section, and inserting the positioning rods into the inter-segment positioning sleeves and the corresponding embedded steel sleeves in sequence;

[0041] S4. Preliminarily fix the embedded parts on the steel skeleton according to the position of the positioning sleeve in the segment, insert the positioning rod into the positioning sleeve in the segment, and fine-tune the position of the embedded parts so that the positioning rod continues to be inserted into the embedded parts to complete the positioning of the embedded parts in the next segment to be poured. Then, pour the concrete and pull out all the positioning rods after the concrete has finally set.

[0042] S5. Circulate steps S3 and S4 to cast the cast-in-place middle plate section by section, and simultaneously position and install the embedded parts by following the mobile positioning assembly;

[0043] S6. After the cast-in-place middle plate is cast and reaches the set strength, the formwork is removed, and the hanging rod on the top of the air duct prefabricated body is passed upward through the embedded steel casing and threadedly connected to the hanging piece. The hanging piece is tightened, and then grouting is injected into the embedded steel casing through the grouting conduit to splice several air duct prefabricated bodies in sequence to form the rail-top air duct.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The present invention first constructs the first section of cast-in-place middle plate and the last section of cast-in-place middle plate, and sets up a bridge track between the two. Then, the remaining casting sections are cast section by section. The positioning assembly is controlled to slide on the bridge track to synchronously follow the casting of the cast-in-place middle plate section by section, and the embedded parts in the corresponding area of ​​each casting section are positioned, thereby ensuring that the embedded parts group in the cast-in-place middle plate meets the installation accuracy requirements.

[0046] 2. During the construction process of the present invention, the positioning and installation of embedded parts and the binding of steel bars are two relatively independent systems, which can avoid the influence of various external factors on the installation accuracy of embedded parts during the construction process, and can ensure that the installation accuracy of embedded parts meets the installation requirements of prefabricated components, so as to prevent the phenomenon of rework in the later stage due to large deviation of the embedded parts accuracy.

[0047] 3. In the present invention, the positioning assembly includes a positioning frame, and an intra-segment positioning sleeve and an inter-segment positioning sleeve arranged on the positioning frame. Through the positioning of the intra-segment positioning sleeve and the inter-segment positioning sleeve, the connection between the embedded parts of the first construction section can be strengthened, ensuring that the embedded parts of the subsequent construction section and the first construction section form a unified whole, and ensuring that the position relationship of the embedded parts of the subsequent construction section and the first construction section meets the design requirements.

[0048] 4. In the present invention, the embedded parts include embedded steel plates, embedded steel casings, grouting ducts and exhaust ducts. The rail-top air duct is composed of several air duct prefabricated bodies spliced ​​together in sequence, and the top of the air duct prefabricated body is connected with a hanging rod, and the top of the hanging rod is threadedly connected with a hanging piece. Therefore, when installing the rail-top air duct, the hanging rod can be directly passed through the embedded steel casing and connected through the hanging piece, so that the air duct prefabricated body can be quickly and conveniently initially fixed under the cast-in-place middle plate, and the hanging piece and the air duct prefabricated body can just block the upper and lower openings of the embedded steel casing, so as to facilitate grouting into the embedded steel casing through the grouting duct, so that the air duct prefabricated body and the embedded parts form a stable permanent connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the main structure of the construction system of the present invention;

[0050] Figure 2 It is a top view schematic diagram of the construction system of the present invention;

[0051] Figure 3 for Figure 1 Cross-sectional view at AA in the middle;

[0052] Figure 4 for Figure 1 A magnified schematic diagram of the local structure;

[0053] Figure 5 It is a structural diagram of embedded parts;

[0054] Figure 6 This is a structural diagram of the rail top air duct;

[0055] Figure 7 This is a schematic diagram of the segmented pouring of the cast-in-place middle slab;

[0056] Figure 8 This is a schematic diagram of the installation process of the rail top air duct;

[0057] Figure 9 This is a schematic diagram after the rail top air duct is installed;

[0058] The meanings of the symbols in the above figure are: rail top air duct 1, air duct prefabricated body 101, hanging piece 102, hanging rod 103, first section cast-in-place middle plate 2, tail section cast-in-place middle plate 3, bridging track 4, steel skeleton 5, embedded parts 6, embedded steel plate 601, embedded steel casing 602, pre-grouting duct 603, exhaust duct 604, positioning assembly 7, positioning frame 701, positioning longitudinal beam 7011, cross support plate 7012, connecting beam 7013, pulley 702, intra-segment positioning casing 703, inter-segment positioning casing 704, positioning rod 705, leveler 706, bubble level 707, locking bolt 708, limit plate 709, formwork 8, cast-in-place middle plate 9. DETAILED DESCRIPTION

[0059] The present invention will be further described below in the form of specific embodiments in conjunction with the accompanying drawings. It should be noted that the following embodiments are merely illustrative of the present invention in the form of examples, but the scope of protection of the present invention is not limited thereto. The embodiments described 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 this field without making creative efforts are within the scope of protection of the present invention.

[0060] Example 1

[0061] This embodiment provides a precise positioning construction system for assembled rail-top air ducts. Figures 1 to 9 ,include:

[0062] The rail top air duct 1 is fixedly installed under the cast-in-place middle plate through the embedded parts 6:

[0063] The first section of cast-in-place middle plate 2;

[0064] The tail section cast-in-place middle plate 3;

[0065] The bridge track 4 is laid along the track top air duct, and its two ends are respectively fixed to the top surface of the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3;

[0066] Embedded parts 6, which are synchronously followed by the segmented pouring of the cast-in-situ middle plate 9 and are sequentially arranged on the steel skeleton 5 in the corresponding area of ​​each pouring segment;

[0067] A positioning assembly 7 that can slide on the bridging rail 4 to synchronously follow the segmented pouring of the cast-in-situ middle plate 3 and position the embedded parts 6 in the corresponding area of ​​each pouring segment;

[0068] In this embodiment, the cast-in-place middle plate is evenly divided into several casting sections, including the first cast-in-place middle plate 2 and the last cast-in-place middle plate 3. The embedded parts 6 are cyclically embedded in the several casting sections at the same spacing, the same number, and the same position. During construction, the first cast-in-place middle plate 2 and the last cast-in-place middle plate 3 are cast first, and the embedded parts 3 are installed in the first cast-in-place middle plate 2 and the last cast-in-place middle plate 3 according to the designed position. Then, the remaining casting sections of the cast-in-place middle plate are cast section by section and the embedded parts 3 are installed in the following manner:

[0069] The bridging rail 4 is erected along the direction of the rail top air duct between the top surfaces of the first section of the cast-in-place middle plate 2 and the last section of the cast-in-place middle plate 3. The bridging rail 4 will not affect the construction of the cast-in-place middle plate. During the step-by-step casting construction of the remaining casting sections of the cast-in-place middle plate, the positioning component 7 slides on the bridging rail 4 to synchronously follow the step-by-step casting of the cast-in-place middle plate 9 and position the embedded parts 6 in the corresponding areas of each casting section, thereby ensuring that the embedded parts group in the cast-in-place middle plate meets the installation accuracy requirements.

[0070] Further, in a preferred embodiment, see Figure 5 , the embedded part 6 includes:

[0071] Embedded steel plate 601;

[0072] The embedded steel casing 602 passes through the embedded steel plate 601 at the top;

[0073] A grouting conduit 603 connected to one side of the bottom of the embedded steel casing 602;

[0074] an exhaust duct 604 communicating with one side of the top of the embedded steel casing 602;

[0075] Among them, the connecting parts of the rail top air duct 1 are inserted into the embedded steel casing 602, and grouting is injected into the embedded steel casing 602 through the grouting duct 603 to ensure the connection strength between the rail top air duct 1 and the embedded parts 6. The exhaust duct 604 can discharge the air in the embedded steel casing 602 to ensure that the slurry can fully fill the grouting area.

[0076] Further, in a preferred embodiment, see Figures 1 to 4 , the positioning component 7 includes:

[0077] Positioning frame 701;

[0078] The pulley 702 is disposed at the bottom of the positioning frame 701 and can be embedded in the bridge track 4 and slide freely along the bridge track 4;

[0079] Several intra-segment positioning sleeves 703 are fixed to the front end of the positioning frame 701 and are arranged in one-to-one correspondence with all the pre-buried steel sleeves 602 in the next section to be cast;

[0080] Several inter-segment positioning sleeves 704 are fixed to the rear end of the positioning frame 701 and are arranged in one-to-one correspondence with some pre-buried steel sleeves 602 in the previous cast segment;

[0081] From top to bottom, a number of positioning rods 705 are sequentially connected with the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704, and the embedded steel sleeve 602 at the corresponding position;

[0082] For ease of understanding, see the example Figures 1 to 4, each casting section is provided with 12 embedded parts 6 in a rectangular array of 4 rows and 3 columns at the same spacing, the same number and the same position. The inter-segment positioning sleeves 704 are 3 in a row, which correspond to the 3 embedded parts 6 in the last row in the cast section. The intra-segment positioning sleeves 703 are 12 arranged in a rectangular array of 4 rows and 3 columns, which correspond to all the embedded steel sleeves 602 in the next section to be cast one by one. Therefore, the relative position of the inter-segment positioning sleeves and the intra-segment positioning sleeves can ensure that the relative position relationship between the embedded parts of the next section to be cast and the previous cast section meets the requirements, and at the same time, it can also ensure that the position of the embedded parts in the next section to be cast meets the design requirements.

[0083] During construction, the position of the positioning frame 701 is adjusted by moving the pulley 702 so that the three inter-segment positioning sleeves 704 are aligned with the three embedded steel sleeves 602 in the last row of the previous cast section, and the positioning rods are inserted into the inter-segment positioning sleeves 704 and the corresponding embedded steel sleeves 602 in turn to ensure that the relative position relationship between the embedded parts of the next section to be cast and the previous cast section meets the requirements; thereafter, the 12 embedded parts 6 are preliminarily fixed on the steel skeleton 5 according to the position of the intra-segment positioning sleeves 703, the positioning rods 705 are inserted into the intra-segment positioning sleeves 703, and the position of the embedded part 6 is fine-tuned so that the positioning rods 705 continue to be inserted into the embedded steel sleeves 602 of the embedded part 6, thereby completing the positioning of the embedded part 6 in the next section to be cast.

[0084] Further, in a preferred embodiment, see Figure 6 The rail top air duct 1 is composed of several air duct prefabricated bodies 101 spliced ​​in sequence. The top of the air duct prefabricated body 101 is connected with a hanging rod 103. The hanging rod 103 passes through the embedded steel casing 602 and extends to the top surface of the cast-in-place middle plate and is threadedly connected to the hanging piece 102.

[0085] Based on the above settings, after the casting of the cast-in-place middle plate is completed in sections, the hanging rod 103 on the top of the air duct prefabricated body 101 can be passed upward through the embedded steel casing 602 and threadedly connected to the hanging piece 102, and the hanging piece 102 is tightened. At this time, the air duct prefabricated body 101 is initially fixed under the cast-in-place middle plate, and the hanging piece 102 blocks the hole above the embedded steel casing 602. The top of the air duct prefabricated body 101 abuts against the cast-in-place middle plate to block the hole below the embedded steel casing 602. After that, grouting is injected into the embedded steel casing 602 through the grouting conduit 603, and the fixed installation of the air duct prefabricated body 101 can be completed quickly and efficiently.

[0086] Further, in a preferred embodiment, see Figures 1 to 4 , the positioning component 7 also includes:

[0087] A locking bolt 708 is provided on one side of the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704 to fix the positioning rod 705 inserted into the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704;

[0088] A limiting piece 709 is provided on the top of the positioning rod 705;

[0089] Based on the above settings, after the concrete in the pouring section has finally set, the locking bolts 708 can be loosened first, and all the positioning rods 705 can be pulled out to disengage the positioning rods 705 from the embedded steel casing 602. Then, the positioning rods 705 can be pulled up and inserted into the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704 and the locking bolts 708 can be tightened. At this time, the positioning rods 705 are suspended and fixed above the pouring section, and will not affect the movement of the positioning assembly 7. In addition, the limiting plate 709 can be used to easily control the pulling up and inserting down of the positioning rods 705, and at the same time, it can prevent the positioning rods 705 from passing through the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704 and falling, causing safety hazards.

[0090] Further, in a preferred embodiment, see Figures 1 to 4 , the positioning component 7 also includes:

[0091] Levelers 706 , which can be telescopically adjusted in height, are disposed at the four corners of the bottom of the positioning frame 701 , with the upper end of the leveler 706 fixedly connected to the bottom of the positioning frame 701 and the lower end abutting against the bridge rail 4 ;

[0092] A bubble level gauge 707, which is disposed at the top center of the positioning frame 701;

[0093] Based on the above settings, whenever the positioning component is moved to the next casting section, and the positioning rod is inserted from top to bottom into the inter-segment positioning sleeve 704 and the corresponding embedded steel sleeve 602 to control the relative position relationship between the embedded parts of the next section to be cast and the previous cast section, since the bridging track 4 is erected between the top surfaces of the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3, the bridging track 4 usually has a large span, and it is difficult for the bridging track 4 to ensure horizontal support for the positioning component. At this time, the positioning frame 701 can be adjusted to a horizontal state through the levelers 706 at the four corner ends of the bottom of the positioning frame 701, and observation is carried out through the horizontal bubble meter 707 to ensure that the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704 is not offset in the vertical position.

[0094] Further, in a preferred embodiment, see Figures 1 to 4 , the positioning frame 701 includes:

[0095] A plurality of positioning longitudinal beams 7011, wherein the number and spacing of the positioning longitudinal beams 7011 are the same as the number and spacing of the longitudinal rows of embedded parts 6;

[0096] A transverse support plate 7012 is connected between the bottoms of the plurality of positioning longitudinal beams 7011 , and the pulley 702 is provided at the bottom of the transverse support plate 7012 ;

[0097] A connecting beam 7013, wherein the connecting beam 7013 is connected between the tops of the plurality of positioning longitudinal beams 7011;

[0098] Based on the above settings, the positioning frame 701 is formed by connecting the cross support plate 7012, the connecting beam 7013 and the positioning longitudinal beam 7011, which can ensure the overall connection strength of the positioning frame 701. At the same time, the intra-segment positioning sleeve 703 or the inter-segment positioning sleeve 704 can be directly welded according to the longitudinal design spacing or fixed to the positioning longitudinal beam 7011 through a U-shaped clip, so that the relative position between the intra-segment positioning sleeve 703 and the inter-segment positioning sleeve 704 meets the requirements, and the layout position of the inter-segment positioning sleeve 704 meets the design requirements.

[0099] Furthermore, in a preferred embodiment, the intra-segment positioning sleeve 703 and the inter-segment positioning sleeve 704 have the same inner diameter as the embedded steel casing 602, and the diameter of the positioning rod 705 is slightly smaller than the inner diameter of the embedded steel casing 602. Specifically, the diameter of the positioning rod 705 is 1-2 mm smaller than the inner diameter of the embedded steel casing 602.

[0100] Example 2

[0101] This embodiment provides a method for accurately positioning and constructing an assembled rail-top air duct. Figure 7 and Figure 8 , including the following steps:

[0102] S1, support the formwork at the positions of the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3 and construct the steel skeleton 5, install the embedded parts 6 on the steel skeleton 5, and then cast the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3;

[0103] S2. After the concrete of the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3 has finally set, a fixed bridge track 4 is erected between the top surfaces of the first section cast-in-place middle plate 2 and the last section cast-in-place middle plate 3 along the designed direction of the rail top air duct, and the positioning assembly 7 is hoisted and installed on the bridge track 4;

[0104] S3: With the first section of the cast-in-place middle plate 2 as the starting point, formwork is set up in the next section to be cast and the steel skeleton 5 is constructed. The position of the positioning assembly 7 is adjusted by moving the pulley 702 so that the inter-segment positioning sleeve 704 is aligned with the corresponding embedded steel sleeve 602 in the previous cast section. The positioning rod is sequentially inserted into the inter-segment positioning sleeve 704 and the corresponding embedded steel sleeve 602;

[0105] S4. Preliminarily fix the embedded part 6 on the steel skeleton 5 according to the position of the positioning sleeve 703 in the segment, insert the positioning rod 705 into the positioning sleeve 703 in the segment, and fine-tune the position of the embedded part 6 so that the positioning rod 705 continues to be inserted into the embedded part 6 to complete the positioning of the embedded part 6 in the next segment to be poured. Then, pour concrete and pull out all the positioning rods 705 after the concrete has finally set.

[0106] S5. Circulate steps S3 and S4 to cast the cast-in-place middle plate section by section, and simultaneously follow the mobile positioning assembly 7 to position and install the embedded parts 6;

[0107] S6. After the cast-in-place middle plate is poured and reaches the set strength, the formwork is removed, and the hanging rod 103 on the top of the air duct prefabricated body 101 is passed upward through the embedded steel casing 602 and threadedly connected to the hanging piece 102. The hanging piece 102 is tightened, and then grouting is injected into the embedded steel casing 602 through the grouting conduit 603, so that several air duct prefabricated bodies 101 are spliced ​​in sequence to form a rail-top air duct.

Claims

1. A precise positioning construction system for an assembled rail-top air duct, comprising a rail-top air duct (1) fixedly installed below a cast-in-place middle plate via embedded parts (6), characterized in that: Also includes: First section cast-in-place middle slab (2); The tail section cast-in-place middle plate (3); A bridge track (4), wherein the bridge track (4) is laid along the direction of the track top air duct, and both ends are fixed to the top surfaces of the first section cast-in-situ middle plate (2) and the last section cast-in-situ middle plate (3); Embedded parts (6), said embedded parts (6) being sequentially arranged on the steel skeleton (5) in the corresponding area of ​​each casting section synchronously following the casting of the cast-in-situ middle plate (9); A positioning assembly (7) is capable of sliding on the bridging track (4) to synchronously follow the segment-by-segment pouring of the cast-in-situ middle plate (3) and to position the embedded parts (6) in the corresponding area of ​​each pouring segment.

2. The precise positioning construction system for the assembled rail-top air duct according to claim 1, characterized in that: The embedded part (6) comprises: Embedded steel plate (601); The top of the embedded steel casing (602) passes through the embedded steel plate (601).

3. The precise positioning construction system for the assembled rail-top air duct according to claim 2, characterized in that: The embedded part (6) further comprises: A grouting conduit (603) connected to one side of the bottom of the embedded steel casing (601); An exhaust duct (604) is connected to one side of the top of the embedded steel casing (601).

4. The precise positioning construction system for the assembled rail-top air duct according to claim 2, characterized in that: The positioning assembly (7) comprises: Positioning frame (701); A pulley (702), the pulley (702) being arranged at the bottom of the positioning frame (701) and capable of being embedded in the bridge track (4) and sliding freely along the bridge track (4); A plurality of intra-segment positioning sleeves (703), wherein the plurality of intra-segment positioning sleeves (703) are fixed to the front end of the positioning frame (701) and are arranged in one-to-one correspondence with all pre-buried steel sleeves (602) in the next segment to be cast; A plurality of inter-segment positioning sleeves (704), which are fixed to the rear end of the positioning frame (701) and are arranged in one-to-one correspondence with the partially embedded steel sleeves (602) in the previous cast segment; From top to bottom, a plurality of positioning rods (705) are sequentially connected with the intra-segment positioning sleeve (703) or the inter-segment positioning sleeve (704) and the pre-buried steel sleeve (601) at the corresponding position.

5. The precise positioning construction system for the assembled rail-top air duct according to claim 4, characterized in that: The positioning assembly (7) further comprises: A locking bolt (708), the locking bolt (708) being arranged on one side of the intra-segment positioning sleeve (703) or the inter-segment positioning sleeve (704) for fixing the positioning rod (705) inserted into the intra-segment positioning sleeve (703) or the inter-segment positioning sleeve (704); A limiting piece (709) is provided on the top of the positioning rod (705).

6. The precise positioning construction system for the assembled rail-top air duct according to claim 4, characterized in that: The positioning assembly (7) further comprises: A leveler (706), the leveler (706) can be telescopically adjusted in height, the leveler (706) is arranged at the four corner ends of the bottom of the positioning frame (701), and the upper end of the leveler (706) is fixedly connected to the bottom of the positioning frame (701), and the lower end is in contact with the bridge track (4); A bubble level meter (707) is provided at the top center of the positioning frame (701).

7. The precise positioning construction system for the assembled rail-top air duct according to claim 4, characterized in that: The positioning frame (701) comprises: A plurality of positioning longitudinal beams (7011), wherein the number and spacing of the positioning longitudinal beams (7011) are the same as the number and spacing of the longitudinal rows of embedded parts (6); A transverse supporting plate (7012), wherein the transverse supporting plate (7012) is connected between the bottoms of a plurality of positioning longitudinal beams (7011), and the pulley (702) is arranged at the bottom of the transverse supporting plate (7012); A connecting beam (7013), wherein the connecting beam (7013) is connected between the tops of several positioning longitudinal beams (7011).

8. The precise positioning construction system for the assembled rail-top air duct according to claim 4, characterized in that: The inner diameters of the intra-segment positioning sleeve (703) and the inter-segment positioning sleeve (704) are the same as the inner diameters of the embedded steel sleeve (602), and the diameter of the positioning rod (705) is slightly smaller than the inner diameter of the embedded steel sleeve (602).

9. The precise positioning construction system for the assembled rail-top air duct according to claim 2, characterized in that: The rail top air duct (1) is formed by sequentially splicing together a plurality of air duct prefabricated bodies (101); the top of the air duct prefabricated body (101) is connected to a hanging rod (103); the hanging rod (103) passes through the embedded steel casing (601) upwards and extends to the top surface of the cast-in-place middle plate and is threadedly connected to a hanging piece (102).

10. The precise positioning construction method of the assembled rail top air duct is characterized by: The steps include: S1, supporting the formwork at the positions of the first section cast-in-place middle plate (2) and the last section cast-in-place middle plate (3) and constructing the steel frame (5), installing the embedded parts (6) on the steel frame (5), and then casting the first section cast-in-place middle plate (2) and the last section cast-in-place middle plate (3); S2, after the concrete of the first section cast-in-place middle plate (2) and the last section cast-in-place middle plate (3) has finally set, a bridge track (4) is installed between the top surfaces of the first section cast-in-place middle plate (2) and the last section cast-in-place middle plate (3) along the designed direction of the track top air duct, and the positioning assembly (7) is hoisted and installed on the bridge track (4); S3, taking the first section of cast-in-situ middle plate (2) as the starting point, supporting the formwork and constructing the steel frame (5) in the next section to be cast, moving and adjusting the position of the positioning assembly (7) by the pulley (702), so that the inter-segment positioning sleeve (704) is aligned with the corresponding embedded steel sleeve (602) in the previous cast section, and inserting the positioning rod into the inter-segment positioning sleeve (704) and the corresponding embedded steel sleeve (602) in sequence; S4, preliminarily fixing the embedded part (6) on the steel skeleton (5) according to the position of the positioning sleeve (703) in the segment, inserting the positioning rod (705) into the positioning sleeve (703) in the segment, and fine-tuning the position of the embedded part (6) so that the positioning rod (705) continues to be inserted into the embedded part (6) to complete the positioning of the embedded part (6) in the next segment to be poured, and then pouring concrete. After the concrete is finally set, all the positioning rods (705) are pulled out; S5, looping through steps S3 and S4 to cast the cast-in-place middle plate section by section, and simultaneously following the mobile positioning assembly (7) to position and install the embedded parts (6); S6. After the cast-in-place middle plate is cast and reaches the set strength, the formwork is removed, and the hanging rod (103) on the top of the air duct prefabricated body (101) is passed upward through the embedded steel casing (601) and threadedly connected to the hanging piece (102). The hanging piece (102) is tightened, and then grouting is injected into the embedded steel casing (601) through the grouting conduit (603), so that several air duct prefabricated bodies (101) are spliced ​​in sequence to form the rail top air duct.

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