A reverse construction method for large-diameter pipelines in a comprehensive pipeline gallery

Abstract

The present invention discloses a reverse construction method for large-diameter pipelines in an integrated pipe gallery, which is used to solve the installation problem of large-diameter pipelines in the integrated pipe gallery, and includes the following steps: pipeline cutting, pipeline transportation, temporary support and fixation of pipelines, pipeline welding, and pier concrete pouring, wherein the construction sequence of pouring and welding installation is exchanged, welding is performed by temporary support and fixation, and then concrete is poured, which avoids the problem of greater difficulty in welding in the pipe gallery in the traditional method, can ensure welding quality, and due to post-pouring, it will not be blocked by the pier during the transportation process, and the transportation process is smoother. The construction method of the present invention greatly simplifies the layout of large-diameter pipelines in the integrated pipe gallery by changing the traditional processing sequence and cooperating with a special transportation trolley, thereby improving production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe gallery construction, and in particular relates to a reverse construction method for large-diameter pipes in a comprehensive pipe gallery. Background Art

[0002] The integrated pipe gallery is an underground urban pipeline integrated corridor, that is, a tunnel space is built underground in the city, which integrates various engineering pipelines such as electricity, communications, gas, heating, water supply and drainage, and is equipped with special inspection ports, hoisting ports and monitoring systems. It implements unified planning, unified design, unified construction and management, and is an important infrastructure and "lifeline" to ensure the operation of the city. In the existing construction process, laying pipelines in the integrated pipe gallery is an important step. The existing technology of laying pipelines is to hoist the pipelines in the reserved openings, complete welding in the pipelines, and finally connect them into a long pipeline. For pipelines with smaller diameters, the laying is relatively simple, but for pipelines with large diameters, due to the large number of pipelines in the integrated pipe gallery, the long pipe gallery and the narrow space, it is difficult to transport them to the integrated pipe gallery, resulting in low efficiency of pipeline transportation in the pipe gallery. Therefore, the transportation and installation of pipelines in the pipe gallery is one of the difficulties in pipeline construction in the pipe gallery.

[0003] In addition, due to the small gap between large-diameter pipelines and integrated pipeline corridors, the traditional construction process is to cast the piers first and then place the pipelines on the piers. Since the piers have been cast in advance, the movable area between the pipelines and the integrated pipeline corridor is further reduced, which will affect the installation quality of the pipelines, making it difficult to adjust and increasing the difficulty of placing pipelines in the integrated pipeline corridor, greatly reducing construction efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a reverse construction method for large-diameter pipelines in an integrated pipeline gallery, which uses a "reverse method" installation process in which the pipelines are installed first and then the piers are cast. The pipelines are installed before the piers are constructed, thereby ensuring the quality of the pipeline installation, reducing the difficulty of lifting the pipelines into place in a closed and narrow space, and saving costs and construction period.

[0005] To achieve the above purpose, the present invention adopts the following technical solution.

[0006] A reverse construction method for a large-diameter pipeline in a comprehensive pipe gallery comprises the following steps:

[0007] Construction preparation stage;

[0008] Pipeline unloading and transportation outside the pipe gallery: divide the long pipeline into several short pipes and transport them to the site separately. Then unload the on-site pipeline according to the production plan and transport them outside the pipe gallery to the designated lifting point;

[0009] Lifting the pipelines into the pipe gallery: Lift the required pipelines into the pipe gallery and prepare for installation;

[0010] Transportation in the pipe gallery: prepare a transport trolley, place the pipeline on the trolley, and push it into the pipe gallery to wait for installation;

[0011] Temporary support and fixation in the pipe gallery: transport the pipeline to the designated location in the pipe gallery and fix it with temporary support;

[0012] Installation of arc-shaped pipe support: Anchor bars used for welding and pouring on arc-shaped pipe support, arc-shaped pipe support can be detachably installed on the pipeline;

[0013] Pipeline interface welding: adjust the position of the short pipe and weld the short pipes end to end to form a long pipe;

[0014] Pier concrete pouring: Place the pier mold under the pipe and pour concrete into the mold, while rotating the pipe so that the embedded parts on the pipe are inserted downward into the concrete in the mold until the concrete reaches the designed strength.

[0015] Post-processing: including: pipeline pressurization, flushing and anti-corrosion.

[0016] Furthermore, the transport and management trolley serves as a temporary supporting and fixing member during the temporary supporting and fixing step in the pipe gallery.

[0017] Furthermore, the transport and management trolley includes: a frame, side panels, and side doors. The frame is composed of two door-shaped frames. The planes where the two door-shaped frames are located are parallel and are connected by side panels arranged on the side frames of the door-shaped frames. The door-shaped frame is divided into two mirror-symmetrical parts on the left and right along the midpoint of its top surface; the bottom edge of the side panel and the bottom surface of the frame are located in the same plane; side doors are arranged on the side frames of the door-shaped frame, and the bottom surfaces of the side panels and the bottom surfaces of the side doors are located in the same plane and are placed on the ground. The side doors, side panels, and door-shaped frames can enclose a model space for casting.

[0018] Furthermore, the rotation axis of the side door is arranged on the side frame of the door-shaped frame and is parallel to the side frame.

[0019] Furthermore, lifting blocks are provided on both side frames of the door-shaped frame. The lifting blocks are trapezoidal blocks and are located in the plane where the door-shaped frame is located. The distance between the bottom surfaces of the two lifting blocks on the same door-shaped frame is smaller than the outer diameter of the pipe, thereby supporting the pipe.

[0020] Furthermore, a slide groove is also provided on the side of the door-shaped frame on which the lifting block is provided, and the lifting block can move in the slide groove.

[0021] Furthermore, the inclined surface of the lifting block is an arc surface, and a groove is arranged on the inclined surface, a surface roller is arranged in the groove, and the surface roller is a cylinder, a rotating shaft is arranged at its axial position, and is parallel to the axial direction of the pipeline when in use.

[0022] Furthermore, the number of the dough rollers is more than one, and the cross-sectional radii of different dough rollers are also different. When in use, the dough rollers all overlap with the pipeline.

[0023] Furthermore, a hollow cavity is reserved in the lower half of the side plate, and an opening is provided on the bottom surface of the side plate, in which a motion base is provided;

[0024] The moving base includes: a chassis, a wheel body, and a gas spring. The wheel body is rotatably connected to both sides of the chassis. The chassis is a strip plate with a cross-sectional area smaller than the bottom opening of the side plate. One end of the gas spring is connected to the top surface of the side plate cavity, and the other end is connected to the chassis.

[0025] Furthermore, a fixing seat is also provided on the pipeline;

[0026] The fixing seat comprises: an outer frame, a pressure rod, and a driving wheel;

[0027] The outer frame includes: a base and side bars, the base is detachably fixed on the ground, and the side bars are vertically connected to the base;

[0028] There are two side rods, and when in use, the plane where the two side rods are located is parallel to the plane where the frame is located;

[0029] The pressure rod is located between the side rods and is perpendicular to the side rods. There are two pressure rods. When in use, the pipeline is located between the two pressure rods.

[0030] The present invention has at least the following beneficial effects:

[0031] (1) The "reverse method" installation process is used to install the pipeline first and then cast the pier. The pipeline is installed before the pier construction and supported and transported by a transport vehicle. During the transportation of the pipeline, it is not blocked by the pier, making it easier to adjust the position of the pipeline and ensure the construction quality.

[0032] (2) When transporting pipelines to the integrated pipe gallery, they are supported by a moving base to ensure that the pipeline joints are correctly connected and improve the installation quality of the pipeline.

[0033] (3) In this construction method, a pipe transport trolley is used to support the pipeline. At the same time, its side panels and side doors form a groove between the bottom of the trolley and the ground. When used in conjunction with a fixed seat, it can form a pier-forming mold, which can be used to support the pipeline while pouring, achieving a reverse construction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings in the specification which constitute a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] In the attached figure:

[0036] Figure 1 The construction flow chart of the present invention is schematically shown;

[0037] Figure 2 The structural diagram of the buttress is schematically shown;

[0038] Figure 3 The schematic diagram shows the positions of the pipe transport trolley and the fixing seat on the pipeline in the present invention;

[0039] Figure 4 The schematic diagram of the structure of the transport and management vehicle in the present invention is shown schematically;

[0040] Figure 5 Schematically shows Figure 4 The structural diagram of part A in the figure;

[0041] Figure 6 The schematic diagram of the structure of the transport and management trolley in the present invention is shown schematically from a side view angle;

[0042] Figure 7 The schematic diagram of the structure of the main viewing angle of the transport and management vehicle in the present invention is shown schematically;

[0043] Figure 8 The structural diagram of the main viewing angle of the fixing seat in the present invention is schematically shown.

[0044] The above drawings include the following reference numerals:

[0045] 1-embedded parts, 2-buttress, 3-pipeline, 4-pipe transport trolley, 41-frame, 42-lifting block, 43-side plate, 44-side door, 45-lifting cylinder, 46-chute, 47-surface roller, 5-connecting plate;

[0046] 61-chassis, 62-wheel body, 63-gas spring;

[0047] 7-fixed seat, 71-outer frame, 72-pressure rod, 73-driving wheel, 74-base. DETAILED DESCRIPTION

[0048] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application; unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which the present application belongs.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0050] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0051] For ease of description, spatially relative terms, such as "on...", "above...", "on the upper surface of...", "above", etc., may be used here to describe the spatial position relationship between a device or feature and other devices or features as shown in the figures; it should be understood that the spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures.

[0052] Example

[0053] like Figure 1 The method shown is a reverse construction method for large-diameter pipes in an integrated pipe gallery, which is used to solve the installation problem of large-diameter pipes in the integrated pipe gallery, and includes the following steps: pipe cutting, pipe transportation, temporary support and fixation of pipes, pipe welding, and pier concrete pouring. The construction sequence of pouring and welding installation is exchanged, welding is performed through temporary support and fixation, and then concrete is poured. This avoids the problem of greater difficulty in welding in the pipe gallery in traditional methods, and can ensure welding quality. Moreover, due to the post-pouring, the pipe transportation process will not be blocked by the piers, and the pipe transportation process is smoother.

[0054] Combined with Figure 1 , the construction process is described as follows according to the construction sequence.

[0055] Construction preparation stage: personnel organization, material preparation and other related work are carried out based on the on-site conditions. This process is flexibly adjusted according to the on-site environment;

[0056] Pipeline unloading and transportation outside the pipe gallery: Divide the long pipeline into several sections and transport them to the site separately. Then unload the on-site pipeline according to the production plan and transport it outside the pipe gallery to the designated lifting point;

[0057] Lifting the pipelines into the pipe gallery: Lift the required pipelines into the pipe gallery and prepare for installation;

[0058] Pipeline transportation in the pipe gallery: Process and manufacture a pipe transport trolley, place the pipeline on the trolley, push it into the pipe gallery, and move it in the integrated pipe gallery;

[0059] Temporary support and fixation in the pipe gallery: The pipeline is transported to the designated position in the pipe gallery and fixed with temporary support. During the temporary support, the position between the pipelines can be adjusted to ensure the installation accuracy. However, the existing technology cannot ensure the installation accuracy due to the lack of temporary support.

[0060] It should be noted that a gantry and a manual hoist are installed in the pipe gallery to adjust the position of the pipeline.

[0061] Arc pipe support installation: The embedded parts used when welding and pouring on the arc pipe support can be detachably installed on the pipe, such as Figure 7 As shown, the embedded parts include: pipe support, anchoring ribs, and the top surface of the pier is provided with an arc surface similar to the shape of the pipeline. This part is the arc-shaped pipe support, which increases the contact area with the pipeline.

[0062] Pipeline interface welding: adjust the position of the pipeline and weld the pipeline into a long pipeline. The existing technology has the problem of low accuracy because it uses a hoisting method to adjust the position, such as Figure 3 As shown, the temporary support used in this embodiment is fixed, the temporary support can provide more stable support, and the position adjustment is simpler.

[0063] Pier concrete pouring: The welded pipes are arranged according to the corresponding positions. The piers are located under the pipes to support the pipes. When pouring, the pier mold is placed under the pipes and the pipes are rotated at the same time so that the embedded parts on the pipes are inserted downward into the concrete of the mold until the concrete reaches the designed strength.

[0064] It should be noted that: Figure 2 As shown, the embedded parts are arranged on the top surface of the pier, in contact with the pipeline, and distribute the weight to the pier, so that the pier supports the pipeline.

[0065] Post-processing: including: pipeline pressurization, flushing and anti-corrosion. The pipeline will be pressurized and flushed according to the use requirements. In order to ensure the service life of the pipeline, anti-corrosion treatment will be carried out according to the design requirements.

[0066] Pipeline acceptance: After quality inspection and acceptance of the post-processed pipeline, the pipeline has been put into use after acceptance.

[0067] Due to the adjustment of traditional production processes, the existing transport and management carts cannot fully meet the usage requirements. In addition, when processing large-diameter pipes, the space in the integrated pipeline corridor is more limited, which further restricts the use of traditional equipment. For this reason, a new transport and management cart is proposed in this application to meet the actual needs of production and construction and further improve production efficiency.

[0068] Specifically, if Figure 4 As shown, the transport and management trolley 4 includes: a frame 41, side panels 43, and side doors 44. The frame 41 is composed of two door-shaped frames, which are arranged in parallel and connected by side panels 43. The bottom edges of the side panels 43 are parallel to the bottom surfaces of the frames 41. The door-shaped frames are all provided with side doors 44, which are located in the plane where the door-shaped frames are located, and the bottom surfaces of the side doors 44 are parallel to the bottom surfaces of the door-shaped frames. The rotation axes of the side doors 44 are arranged on the sides of the door-shaped frames. Since the bottom surfaces of the side panels 43 and the side doors 44 are located in the same plane, they can be placed on the ground to enclose a casting model space, so that the transport and management trolley 4 can be cast and formed while providing temporary support, eliminating the need for template installation and transportation during casting, and also saving the originally narrow internal space of the integrated pipe gallery, thereby greatly improving production efficiency.

[0069] It should be noted that the door-shaped frame is divided into two mirror-symmetrical parts along the midpoint of its top surface, that is, the door-shaped structure of the frame 41 can be divided into two left and right parts. When in use, the two parts of the frame 41 are detachably connected together through the connecting plate 5 to form a door-shaped frame 41. When dismantling the mold, the connecting plate 5 can be removed to quickly demold.

[0070] Furthermore, if Figure 7 As shown, the side door 44 can be rotated to a position perpendicular to the side panel 43, and its position is kept uniform by components such as the connecting plate 5. As a result, the side door 44 and the side panel 43 enclose a mold space for casting the pier 2. When demolding is required, the side door 44 can be rotated to open to reduce the contact area with the concrete, making demolding easier.

[0071] Furthermore, lifting blocks 42 are provided on both side frames of the door-shaped frame. The lifting blocks 42 are blocks with a trapezoidal cross-section and are located in the plane where the door-shaped frame is located. The distance between the bottom surfaces of the two lifting blocks 42 on the same door-shaped frame is smaller than the outer diameter of the pipe 3. When in use, the pipe 3 passes through the door-shaped frame, is placed on the lifting blocks 42, and is supported by the lifting blocks 42.

[0072] like Figure 4 , 6As shown, the door-shaped frame is provided with a sliding groove 46 on the side of the lifting block 42, and the sliding groove 46 is perpendicular to the horizontal plane. The lifting block 42 can move in the sliding groove 46, so as to adjust the elevation of the pipeline 3; of course, a section of the door-shaped frame provided with the sliding groove 46 is a cavity, and a lifting cylinder 45 is provided in the cavity. The lifting block 42 is connected to the output end of the lifting cylinder 45, and the height position of the lifting block 42 is adjusted by the movement of the lifting cylinder 45.

[0073] like Figure 5 As shown, the inclined surface of the lifting block 42 is used to support the pipe 3 when in use, and a surface roller 47 is arranged on the inclined surface. Of course, a groove for installing the surface roller 47 is pre-arranged on the inclined surface. The surface roller 47 is a cylinder, and a rotating shaft is arranged at its axial position so that the surface roller 47 can rotate in the groove, and the rotating shaft of the surface roller 47 is parallel to the axis of the pipe 3 when in use. When the pipe 3 rotates, the surface rail rotates accordingly, and the rotation of the pipe 3 is not affected.

[0074] It should be noted that the inclined surface of the lifting block 42 can be an arc surface that better fits the shape of the pipe 3, and more than one roller 47 is provided, and the cross-sectional radii of different rollers 47 are also different, but all rollers 47 can contact with the pipe 3 to balance the gravity exerted on the rollers 47; in addition, anti-slip material is also applied on the rollers 47 to increase the friction between the pipe 3 and the rollers 47, and combined with the gravity of the pipe 3 itself, the position of the pipe 3 placed on the lifting block 42 is not easy to move.

[0075] like Figure 6 As shown, a hollow cavity is reserved in the lower half of the side plate 43, and an opening is provided on the bottom surface of the side plate 43 to connect the cavity with the outside. A moving base is provided in the cavity of the side plate 43, and the moving base includes: a chassis 61, a wheel body 62, and a gas spring 63, wherein the wheel body 62 is rotatably connected to both sides of the chassis 61, and the chassis 61 is a strip plate with a cross-sectional area smaller than the opening at the bottom edge of the side plate 43. One end of the gas spring 63 is connected to the top surface of the cavity of the side plate 43, and the other end is connected to the chassis 61, so as to lift the frame 41 upward to facilitate movement.

[0076] A fixing seat 7 is also provided on the pipeline 3. The fixing seat 7 includes: an outer frame 71, a pressure rod 72, and a driving wheel 73. Figure 8 As shown, the outer frame 71 includes: a base 74 and side rods. The base 74 is detachably fixed on the ground. The side rods are vertically connected to the base 74. There are two side rods. When in use, the plane where the two side rods are located is parallel to the plane where the frame 41 is located. The pressure rod 72 is located between the side rods and is perpendicular to the side rods. There are two pressure rods 72. When in use, the pipeline 3 is located between the two pressure rods 72.

[0077] Furthermore, the pressure rod 72 is connected to the lifting device so that the pressure rod 72 moves with the movement of the lifting device. The lifting device includes but is not limited to a cylinder, and the height direction of the pipeline 3 is controlled through the fixed seat 7.

[0078] The method of using this embodiment is described with reference to the accompanying drawings.

[0079] Transportation of pipeline 3 in the pipeline gallery: first, the frame 41 is connected into a door-type structure through the connecting plate 5. The pipeline 3 passes through the frame 41 and is placed on the lifting block 42. The moving base at the bottom of the side plate 43, under the action of the gas spring 63, lifts the transport trolley 4 upward, and the wheel body 62 contacts the ground, making it easier to move, thereby facilitating the transportation of the pipeline 3 in the integrated pipeline gallery.

[0080] Temporary support and fixation in the pipe gallery: the pipe 3 is supported by the transport and management trolley 4, and the lifting block 42 supporting the pipe 3 on the transport and management trolley 4 can move up and down. Therefore, it can be supported by traditional components such as steel benches, which is beneficial to reduce the space occupied in the integrated pipe gallery.

[0081] The pipe 3 interface is welded, because a moving base is provided, so the position adjustment before welding is easier to achieve and the adjustment is more convenient.

[0082] The pier 2 is concreted, and fixed seats 7 are arranged on the welded pipe 3 at intervals. The fixed seats 7 press the pipe 3 downward, and the transport trolley 4 is also pressed downward. The chassis 61 of the transport trolley 4 is pressed into the side plate 43, and the bottom surface of the side plate 43 is in contact with the ground, thereby forming a mold space for pouring. After the pouring is completed, the fixed seat 7 lifts the pipe 3 upward, and the fixed seat 7 bears the force. The connection between the connecting plate 5 and the side door 44 is removed, and the transport trolley 4 can be removed from the pipe 3.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0084] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to the skilled person or technician.

Claims

1. A reverse construction method for large-diameter pipelines in a comprehensive pipe gallery, characterized in that: The following steps are involved: Construction preparation stage; Pipeline unloading and transportation outside the pipe gallery: divide the long pipeline into several short pipes and transport them to the site separately. Then unload the on-site pipeline according to the production plan and transport them outside the pipe gallery to the designated lifting point; Lifting the pipelines into the pipe gallery: Lift the required pipelines into the pipe gallery and prepare for installation; Transportation in the pipe gallery: prepare a transport trolley, place the pipeline on the trolley, and push it into the pipe gallery to wait for installation; Temporary support and fixation in the pipe gallery: transport the pipeline to the designated location in the pipe gallery and fix it with temporary support; Installation of arc-shaped pipe support: Anchor bars used for welding and pouring on arc-shaped pipe support, arc-shaped pipe support can be detachably installed on the pipeline; Pipeline interface welding: adjust the position of the short pipe and weld the short pipes end to end to form a long pipe; Pier concrete pouring: Place the pier mold under the pipe and pour concrete into the mold. Rotate the pipe at the same time so that the embedded parts on the pipe are inserted downward into the concrete of the mold until the concrete reaches the designed strength. Post-processing: including: pipeline pressurization, flushing and anti-corrosion; The transport and management trolley serves as a temporary support fixture during the temporary support and fixation step in the pipe gallery; The transport and management trolley comprises: a frame, a side panel, and a side door. The frame is composed of two door-shaped frames, the planes where the two door-shaped frames are located are parallel, and the door-shaped frames are connected by side panels arranged on the side frames of the door-shaped frames. The door-shaped frames are divided into two mirror-symmetrical parts on the left and right along the midpoint of their top surfaces; the bottom edges of the side panels and the bottom surface of the frame are located in the same plane; the side frames of the door-shaped frames are all provided with side doors, the bottom surfaces of the side panels and the bottom surfaces of the side doors are located in the same plane, and are placed on the ground. The side doors, side panels, and door-shaped frames can enclose a model space for casting; The two side frames of the door-shaped frame are both provided with lifting blocks, which are trapezoidal blocks. The lifting blocks are located on the plane where the door-shaped frame is located. The distance between the bottom surfaces of the two lifting blocks on the same door-shaped frame is smaller than the outer diameter of the pipeline, so as to support the pipeline. The side of the door frame on which the lifting block is provided is also provided with a slide groove, and the lifting block can move in the slide groove; The inclined surface of the lifting block is an arc surface, and a groove is arranged on the inclined surface, a surface roller is arranged in the groove, and the surface roller is a cylinder, and a rotating shaft is arranged at the axis position thereof, and is parallel to the axis direction of the pipeline when in use; A hollow cavity is reserved in the lower half of the side plate, and an opening is provided on the bottom surface of the side plate, in which a motion base is provided; The moving base includes: a chassis, a wheel body, and a gas spring. The wheel body is rotatably connected to both sides of the chassis. The chassis is a strip plate with a cross-sectional area smaller than the bottom opening of the side plate. One end of the gas spring is connected to the top surface of the side plate cavity, and the other end is connected to the chassis.

2. The reverse construction method of a large-diameter pipeline in a comprehensive pipe gallery according to claim 1 is characterized in that: The rotation axis of the side door is arranged on the side frame of the door-shaped frame and is parallel to the side frame.

3. The reverse construction method of a large-diameter pipeline in a comprehensive pipe gallery according to claim 2 is characterized in that: The number of the dough rollers is more than one, and the cross-sectional radius of different dough rollers is also different. When in use, the dough rollers all overlap with the pipeline.

4. The reverse construction method of a large-diameter pipeline in a comprehensive pipe gallery according to claim 3 is characterized in that: The pipeline is also provided with a fixing seat; the fixing seat comprises: an outer frame, a pressure rod, and a driving wheel; The outer frame includes: a base and side bars, the base is detachably fixed on the ground, and the side bars are vertically connected to the base; There are two side rods, and when in use, the plane where the two side rods are located is parallel to the plane where the frame is located; The pressure rod is located between the side rods and is perpendicular to the side rods. There are two pressure rods. When in use, the pipeline is located between the two pressure rods.

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