Large prefabricated pipe gallery and construction method thereof

Abstract

The invention discloses a large prefabricated pipe gallery which is mounted at the bottom of a pipe gallery foundation pit and comprises a plurality of concrete ground beams with horizontal top surfaces and arranged side by side in the length direction of the pipe gallery foundation pit, a plurality of bearing roll shafts are arranged on the upper surfaces of the concrete ground beams at intervals, and the bearing roll shafts roll in the length direction of the concrete ground beams; the prefabricated pipe gallery sections are connected end to end and have the same section, each prefabricated pipe gallery section is in a hollow annular shape, the outer bottom face of each prefabricated pipe gallery section is horizontal, the periphery of one end of each prefabricated pipe gallery section is shrunk inwards to form a reducing section, and the periphery of the other end of each prefabricated pipe gallery section horizontally extends to form an outer wrapping section; the reducing section of each prefabricated pipe gallery section is inserted into the outer wrapping section of the adjacent prefabricated pipe gallery section in a matched mode, and the outer bottom face of each prefabricated pipe gallery section is supported by a plurality of bearing roll shafts. The invention further discloses the prefabricated pipe gallery and a construction method thereof, the continuous construction period in the pipe gallery foundation pit is extremely short, and the construction efficiency of the large pipe gallery is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of underground structure construction, and more specifically, to a large prefabricated pipe gallery and a construction method thereof. Background Art

[0002] With the continuous advancement of urbanization, underground comprehensive pipeline corridors have been widely adopted as underground structures that can uniformly accommodate and organize municipal pipelines such as electricity, heating, communications, water supply and drainage, gas, radio and television.

[0003] There are two major construction modes for underground comprehensive pipeline corridors: open excavation and concealed excavation. Since underground pipeline corridors are mostly used in urban renewal, the open excavation method has obvious cost advantages and construction convenience advantages compared to the concealed excavation method. However, since the pipeline corridor foundation pit and transportation site occupy a large amount of ground space, the open excavation method has a great impact on traffic organization and municipal activities. At present, the open excavation method of pipeline corridor construction generally adopts two methods: open excavation cast-in-place or open excavation prefabrication. Among them, the construction process of open excavation cast-in-place structure is basically equivalent to conventional underground concrete engineering, and the process is the simplest. However, since the processes of binding reinforcement, supporting formwork, pouring, and curing need to be carried out on site, the pipeline corridor foundation pit cannot be closed for a long time and occupies the longest time. It cannot be used in many scenarios. Therefore, in recent years, the open excavation prefabrication method has also been widely adopted to improve the overall construction speed.

[0004] In the open-cut prefabrication method, it is first necessary to groove the ground and harden or reinforce the slope and the bottom of the groove. Subsequent construction is carried out under the stable foundation of the foundation pit. The prefabricated components are placed along the line inside or outside the foundation pit using lifting equipment. The prefabricated corridor method can be mainly divided into three forms: integral corridor section, semi-prefabricated and semi-cast corridor section, and assembled pipe segment type. However, no matter which method is used, during the transportation and lifting of the pipe section, it must occupy the outside of the foundation pit for a long time. Since the location of the underground prefabricated corridor is often in the transportation hub area, there are stricter requirements for the site red line, especially when the corridor construction red line is exactly parallel and coincides with the existing road. At this time, if conventional lifting methods are used for construction, the lifting and transportation of prefabricated components in the corridor foundation pit can only occupy the traffic road outside the foundation pit during non-peak traffic periods, which not only seriously affects traffic, but also greatly reduces construction efficiency. Considering that large prefabricated corridors must use special lifting equipment, the occupation of the outside of the site is even more serious.

[0005] Chinese patent CN110359489B discloses a large-scale prefabricated pipe gallery push-up construction structure, which lays tracks at the bottom of the foundation pit and drives the prefabricated pipe gallery segments to the designed position section by section along the tracks using a push-up trolley. This method effectively completes the transportation of prefabricated pipe gallery segments within a limited pipe gallery foundation pit. This method completes the advancement of the prefabricated pipe gallery segments in a manner similar to the stepping operation of shield equipment and TBM machine heads, effectively avoiding the occupation of space outside the pipe gallery foundation pit. However, the prefabricated pipe gallery segments need to be driven one by one, the construction efficiency is low, and the construction period of the overall pipe gallery is relatively long. Therefore, it is necessary to propose a new large-scale prefabricated pipe gallery and a corresponding construction method, which can greatly improve the construction efficiency of the prefabricated pipe gallery without occupying the site outside the foundation pit. Summary of the invention

[0006] An object of the present invention is to provide a large-scale prefabricated pipe gallery and a construction method thereof, which can quickly complete the construction of a whole section of the prefabricated pipe gallery without occupying space outside the foundation pit.

[0007] In order to achieve these purposes and other advantages according to the present invention, according to one aspect of the present invention, there is provided a large-scale prefabricated pipe gallery installed at the bottom of a pipe gallery foundation pit, comprising: a plurality of concrete ground beams with horizontal top surfaces and arranged side by side along the length of the pipe gallery foundation pit, a plurality of load-bearing rollers being arranged at intervals on the upper surfaces of the concrete ground beams, and the load-bearing rollers rolling along the length direction of the concrete ground beams; a plurality of prefabricated pipe gallery segments connected end to end and having the same cross-section, the prefabricated pipe gallery segments being hollow annular and having horizontal outer bottom surfaces, one end of the prefabricated pipe gallery segment being contracted to form a reduced diameter segment, and the other end of the prefabricated pipe gallery segment being horizontally extended with an outer covering segment, the reduced diameter segment of each prefabricated pipe gallery segment being matched and socketed in the outer covering segment of an adjacent prefabricated pipe gallery segment, and the outer bottom surface of the prefabricated pipe gallery segment being supported by a plurality of load-bearing rollers.

[0008] Preferably, the inner side wall of the prefabricated pipe gallery segment is detachably connected to a pulling bracket.

[0009] Preferably, the inner side wall of the prefabricated pipe gallery segment is detachably connected with a plurality of cable binding structures, and the cable binding structures of two adjacent prefabricated pipe gallery segments are detachably bound with a plurality of connecting cables.

[0010] Preferably, the tying structure includes a fixing plate and a tying column, the tying column is an enlarged stick-shaped structure with one end fixed to the fixing plate and the other end thereof, the inner wall of the prefabricated pipe gallery segment is provided with a plurality of first fixing holes, the fixing plate is provided with matching through holes and is fixed to the inner wall of the prefabricated pipe gallery segment by bolts.

[0011] Preferably, a grouting through hole connecting the inside and the outside is opened at the bottom of the prefabricated pipe gallery segment.

[0012] Preferably, the reduced diameter segment of the prefabricated pipe gallery segment is ringed with multiple rubber waterstops.

[0013] According to another aspect of the present invention, a construction method for a large prefabricated pipe gallery is also provided, comprising the following steps: S1. Complete the production of all prefabricated pipe gallery segments in the prefabrication factory and transport them to the site; S2. Excavate the tunnel foundation pit within the construction red line, complete the slope support in the tunnel foundation pit, and perform pit bottom treatment on the bottom of the tunnel foundation pit to form a stable base layer; S3, constructing a concrete ground beam on the base layer, and placing load-bearing rollers thereon at intervals; S4. Fix a steel cable pulling device at one end of the tunnel foundation pit, and fix one end of the pulling cable to the steel cable pulling device; S5. At the other end of the tunnel foundation pit, at least one prefabricated tunnel segment is placed on a load-bearing roller using a lifting device, a pulling bracket is installed in one of the prefabricated tunnel segments, the other end of the pulling cable is connected to the pulling bracket, a tying cable structure is installed in the prefabricated tunnel segment, and a connecting cable is tied and pulled between the tying cable structures of any two adjacent prefabricated tunnel segments; S6, start the steel cable pulling device so that the pulling cable drives the prefabricated pipe gallery segments connected by several connecting cables at one end of the pipe gallery foundation pit, pulls them to the designated position along the concrete ground beam and fixes them, and removes the pulling bracket and the cable binding structure; S7, repeating steps S5-S6 to complete the installation of all prefabricated pipe gallery segments in the pipe gallery foundation pit, ensuring that the reduced diameter segment of any prefabricated pipe gallery segment is inserted into the outer package segment of the adjacent prefabricated pipe gallery segment; S8, temporarily plugging the grouting through hole, pouring a fine stone concrete layer on the base layer, the surface of the fine stone concrete layer outside the prefabricated pipe gallery segment is higher than the bottom surface of the prefabricated pipe gallery segment; S9, after the initial setting of the fine stone concrete layer, secondary grouting is performed through the grouting holes in the prefabricated pipe gallery segment; S10. After the fine stone concrete layer reaches more than 50% strength, backfill the earth until the tunnel foundation pit is filled; S11. Complete the secondary masonry and electromechanical piping in the prefabricated pipe gallery segment.

[0014] The present invention has at least the following beneficial effects: First, the prefabricated pipe gallery segments used in the present invention can be centrally piled at one end of the pipe gallery foundation pit and hoisted into the concrete ground beam and the bearing roller in the foundation pit by the hoisting equipment at one end of the pipe gallery foundation pit, and then gradually pulled to the predetermined position in the pipe gallery foundation pit by the steel cable pulling device. The continuous construction period in the foundation pit is extremely short, which greatly improves the construction efficiency of large pipe galleries; Second, the prefabricated pipe gallery segments used in the present invention are spliced ​​in front and back. After the first prefabricated pipe gallery segment is positioned and fixed, each subsequent batch of prefabricated pipe gallery segments pulled will press against the prefabricated pipe gallery segment in front for a second time; Third, the prefabricated pipe gallery segment used in the present invention is a hollow annular pipe segment, which does not affect the rope passing through and pulling the remaining prefabricated pipe gallery segments behind. The partition wall and pipe routing in the prefabricated pipe gallery segment can be carried out after backfilling the soil. The existence time of the pipe gallery foundation pit is relatively short, and the entire construction process minimizes the occupied site.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a general schematic diagram of the construction process of a large-scale prefabricated pipe gallery in a technical solution of the present invention; Figure 2 A side schematic diagram of the construction process of a large prefabricated pipe gallery in a technical solution of the present invention; Figure 3 It is a front schematic diagram of a large prefabricated pipe gallery during construction in a technical solution of the present invention; Figure 4 It is a front view schematic diagram of a large prefabricated pipe gallery after backfilling of the foundation pit of the pipe gallery in a technical solution of the present invention; Figure 5 A schematic diagram of a prefabricated pipe gallery segment being suspended in a technical solution of the present invention; Figure 6 A schematic diagram of a prefabricated pipe gallery segment in a technical solution of the present invention; Figure 7 It is a schematic diagram of hoisting several prefabricated pipe gallery segments in the same batch in a technical solution of the present invention; Figure 8 It is a schematic diagram of several prefabricated pipe gallery segments assembled in a technical solution of the present invention; Fig. 9 It is a schematic diagram of a reduced diameter segment and an outer package segment in a technical solution of the present invention; Fig.10 This is a schematic diagram of the installation of a concrete ground beam in a technical solution of the present invention; Fig.11 This is a schematic diagram of a concrete ground beam in a technical solution of the present invention; Fig.12 It is a schematic diagram of the binding cable structure in a technical solution of the present invention.

[0017] Legend: 1-prefabricated pipe gallery segment, 11-reduced diameter segment, 12-cable tying structure, 120-first fixing hole, 121-connecting cable, 122-fixing plate, 123-cable tying column, 13-pulling bracket, 130-second fixing hole, 131-suspending beam, 132-suspending support column, 15-rubber waterstop, 16-outer package segment, 17-grouting through hole, 2-pipe gallery foundation pit, 21-base layer, 22-fine stone concrete layer, 23-backfill soil, 3-concrete ground beam, 31-load-bearing roller, 4-cable pulling device, 41-pulling cable. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0019] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0020] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the structures and components can be obtained from commercial sources unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0021] like Figures 1 to 12As shown, the present invention provides a large prefabricated pipe gallery, which is installed at the bottom of a pipe gallery foundation pit 2, and includes: a plurality of concrete ground beams 3 with horizontal top surfaces and arranged side by side along the length of the pipe gallery foundation pit 2, a plurality of load-bearing rollers 31 are arranged at intervals on the upper surfaces of the concrete ground beams 3, and the load-bearing rollers 31 roll along the length direction of the concrete ground beams 3; a plurality of prefabricated pipe gallery segments 1 connected end to end and having the same cross-section, the prefabricated pipe gallery segments 1 are hollow ring-shaped and have horizontal outer bottom surfaces, one end of the prefabricated pipe gallery segment 1 is shrunk to form a reduced diameter segment 11, and the other end of the prefabricated pipe gallery segment 1 is horizontally extended with an outer segment 16, the reduced diameter segment 11 of each prefabricated pipe gallery segment 1 is matched and inserted in the outer segment 16 of the adjacent prefabricated pipe gallery segment 1, and the outer bottom surface of the prefabricated pipe gallery segment 1 is supported by a plurality of load-bearing rollers 31.

[0022] In the present technical scheme, the construction red line of the entire open-cut tunnel is mainly the two ends of the tunnel foundation pit 2 and the slopes on both sides of the tunnel foundation pit 2. There is basically no need to consider occupying other sites for the lifting or transportation of any components, which greatly alleviates the organizational coordination problem outside the construction red line. After the tunnel foundation pit 2 is grooved, the normal process is used to temporarily treat the slope, and the bottom of the tunnel foundation pit 2 needs to be subjected to conventional anti-floating, hardening, drainage, strong tamping and other treatment measures according to the geological conditions to avoid the occurrence of settlement and arching of the bottom of the foundation pit. The concrete ground beam 3 can be a prefabricated concrete component or cast together with the foundation pit bottom treatment measures. The concrete ground beam 3 serves as a transportation track for the prefabricated tunnel segment 1. It needs to ensure straightness and levelness during installation or on-site casting. After the construction of the concrete ground beam 3 is completed, it is necessary to manually check the flatness of the top surface and smooth it twice using high-strength mortar. The concrete ground beam 3 needs to be straight and continuously located in the tunnel foundation pit 2. There are at least two concrete ground beams 3 in the tunnel foundation pit 2 to balance the prefabricated tunnel segment 1. This scheme adopts the technical principles of large-scale building translation engineering. Since the prefabricated tunnel segment 1 itself is relatively light, considering the problem of long-distance and rapid transportation, a winch can be fixedly installed at one end of the tunnel foundation pit 2 and used with a rope to pull each piece. During each traction process, it is necessary to check whether the load-bearing rollers 31 are evenly distributed on each concrete ground beam 3. The concrete ground beam 3 can add limit plates and limit blocks on both sides of the top surface to prevent the load-bearing rollers 31 from falling.

[0023] In the present technical scheme, after the prefabricated pipe gallery segment 1 is placed on the concrete ground beam 3 at one end of the pipe gallery foundation pit 2, the pulling rope is connected between the winch and the prefabricated pipe gallery segment 1 to be pulled. Before the formal pulling operation, it is necessary to manually check whether the load-bearing rollers 31 along the way are in place. When the prefabricated pipe gallery segment 1 is tied with the pulling rope, it is necessary to check whether the pulling rope, prefabricated pipe gallery segment 1 and other equipment will collide with various other machines, equipment, and structures along the way during the pulling process, and make timely on-site adjustments. In the process of the prefabricated pipe gallery segment 1 being pulled forward, a special person is required to accompany and check whether the load-bearing rollers 31 in front are stacked in place as required by the plan. When the first prefabricated pipe gallery segment 1 is pulled to the target position, a bracket with a positioning function or a concrete cast is required on site. A concrete retaining wall is used to prevent the first prefabricated pipe gallery segment 1 from being displaced during the subsequent construction process. During the pulling work of the subsequent prefabricated pipe gallery segment 1, the pulling rope connected to the prefabricated pipe gallery segment 1 to be pulled and the winch equipment passes through the middle of the prefabricated pipe gallery segment 1 that has been positioned in front. Since each prefabricated pipe gallery segment 1 includes an outer segment 16 and a reduced diameter segment 11, all prefabricated pipe gallery segments 1 ensure consistency of direction during hoisting. In this way, at the end of the pulling process, the reduced diameter segment 11 of any adjacent prefabricated pipe gallery segment 1 will always match and be inserted in the outer segment 16 of another prefabricated pipe gallery segment 1. The reduced diameter segment 11 can be surrounded by rubber rings, water stop strips and other measures to avoid leakage problems at the pipe joints of the subsequent prefabricated pipe gallery segments 1 during their working life.

[0024] In the present technical scheme, since the entire prefabricated pipe gallery segment 1 is fully supported by the load-bearing roller 31, in order to ensure that the prefabricated pipe gallery segment 1 does not move after being pulled into place, it is necessary to select and install a temporary bracket according to the actual situation. After the pulling of the entire prefabricated pipe gallery segment 1 is completed, concrete is poured into the pipe gallery foundation pit 2 to cast the outer bottom of the prefabricated pipe gallery segment 1, the concrete ground beam 3 and the load-bearing roller 31 as a whole, and finally the prefabricated pipe gallery segment 1 is fixed. When the strength of the poured concrete reaches the requirements of the specific scheme, the soil is backfilled layer by layer in the pipe gallery foundation pit 2 and compacted. The surface restoration in the subsequent construction red line and the partition construction and pipeline construction in the prefabricated pipe gallery segment 1 are carried out simultaneously. The prefabricated pipe gallery segment 1 used in the present invention can be centrally loaded at one end of the pipe gallery foundation pit 2 and passed through the pipe gallery foundation The hoisting equipment at the other end of the pit 2 is hoisted onto the concrete ground beam 3 in the foundation pit, and then gradually pulled to the predetermined position in the corridor foundation pit 2 by equipment such as winches. The entire project has an extremely short construction period in the corridor foundation pit 2, which greatly improves the construction efficiency of large-scale corridors. The prefabricated corridor segments 1 used in the present invention are spliced ​​in front and back. After the first prefabricated corridor segment 1 is positioned and fixed, each subsequent batch of prefabricated corridor segments 1 pulled will tighten the front prefabricated corridor segment 1 for a second time; the prefabricated corridor segments 1 used in the present invention are hollow annular pipe segments, which do not affect the rope passing through and pulling the remaining prefabricated corridor segments 1 at the rear. The partition walls and pipe routing in the prefabricated corridor segments 1 can be carried out simultaneously with the surface restoration work after backfilling. The corridor foundation pit 2 exists for a short time, and the entire construction process minimizes the occupied site.

[0025] In another technical solution, the inner wall of the prefabricated pipe gallery segment 1 is detachably connected with a pulling bracket 13. During the production and processing in the prefabricated component factory, a second fixing hole 130 is reserved on the inner wall of the prefabricated pipe gallery segment 1. The second fixing hole 130 has an internal thread. The pulling bracket 13 includes several suspension support columns 132. The suspension support columns 132 are vertically installed in the prefabricated pipe gallery segment 1 by bolts. The two ends of the suspension support columns 132 are fixed with fixing plates for installing bolts. The second fixing holes 130 are opened on the top and bottom surfaces of the inner wall of the prefabricated pipe gallery segment 1. The suspension support columns 132 are detachably connected with horizontally arranged The suspension beam 131, the pulling bracket 13 is detachably connected to the inner wall of the prefabricated pipe gallery segment 1, and is installed inside before the prefabricated pipe gallery segment 1 is lifted. The suspension beam 131 is connected to the winch and other equipment at the other end of the pipe gallery foundation pit 2 by ropes, and the pulling force is evenly distributed to the prefabricated pipe gallery segment 1 through the suspension support column 132. The suspension support column 132 and the suspension beam 131 are evenly arranged so that the traction tension can be evenly distributed on the side walls of the prefabricated pipe gallery segment 1. Optionally, the setting method and number of the suspension beam 131 and the suspension support column 132 can be adjusted according to the size, weight and shape of the prefabricated pipe gallery segment 1.

[0026] In another technical solution, the inner side wall of the prefabricated pipe gallery segment 1 is detachably connected with a plurality of cable tying structures 12, and a plurality of connecting ropes 121 are detachably tied between the cable tying structures 12 of two adjacent prefabricated pipe gallery segments 1. In this technical solution, a plurality of adjacent prefabricated pipe gallery segments 1 can be pulled together in the same pulling operation, and the cable tying structure 12 is a stick-shaped or ring-shaped structure with relatively large rigidity for winding ropes, and the cable tying structure 12 has the same position on the same batch of prefabricated pipe gallery segments 1, and the connecting rope 121 is a steel cable or rope-type device with sufficient strength. On-site personnel use the connecting rope 121 to tie any two adjacent prefabricated pipe gallery segments 1 pulled in the same batch with ropes, wherein the pulling bracket 13 is installed closest to the pulling device On a prefabricated pipe gallery segment 1 of the batch, during the pulling process, the pulling equipment directly pulls the first prefabricated pipe gallery segment 1 of the batch, and the segment pulls the subsequent prefabricated pipe gallery segments 1 in sequence through the connecting rope 121. Due to the sequential pulling method, when the first prefabricated pipe gallery segment 1 of the batch is in a nested state with the last prefabricated pipe gallery segment 1 of the previous batch, the subsequent prefabricated pipe gallery segments 1 connected by the connecting rope 121 are actually still at a certain distance from each other, and all the prefabricated pipe gallery segments 1 of the batch need to be pushed by the subsequent pulling batch of prefabricated pipe gallery segments 1 until they are in a nested state. When the first prefabricated pipe gallery segment 1 of the pulling batch is in place, the pulling bracket 13, the cable binding structure 12, and the connecting rope 121 are disassembled for subsequent pulling operations.

[0027] In another technical solution, the tying structure 12 includes a fixing plate 122 and a tying column 123. The tying column 123 is a stick-shaped structure with one end fixed to the fixing plate 122 and the other end enlarged. The inner wall of the prefabricated pipe gallery segment 1 is provided with a plurality of first fixing holes 120. The fixing plate 122 is provided with matching through holes and is fixed to the inner wall of the prefabricated pipe gallery segment 1 by bolts. The tying structure 12 can be easily installed and removed, and the unfixed end of the tying column 123 is enlarged to prevent the connecting cable 121 from falling off.

[0028] In another technical solution, a grouting hole 17 connecting the inside and the outside is opened at the bottom of the prefabricated pipe gallery segment 1. After the entire section of the prefabricated pipe gallery is placed, concrete needs to be poured into the pipe gallery foundation pit 2 to completely fix the prefabricated pipe gallery segment 1. Therefore, the grouting hole 17 first serves as an exhaust hole when pouring concrete into the pipe gallery foundation pit 2 to avoid that the concrete cannot fully contact the outer bottom of the prefabricated pipe gallery segment 1 during pouring. Secondly, after backfilling the pipe gallery foundation pit 2, the grouting hole 17 can be opened for pressure grouting operations. The grouting material is secondarily filled in the gap that may appear below the prefabricated pipe gallery segment 1 to ensure that the bottom surface of the prefabricated pipe gallery segment 1 is in full contact with the concrete layer below.

[0029] In another technical solution, the reduced diameter segment 11 of the prefabricated pipe gallery segment 1 is surrounded by multiple rubber waterstop strips 15 .

[0030] In another technical solution, the construction method of the above-mentioned large prefabricated pipe gallery includes the following steps: S1. Complete the production of all prefabricated pipe gallery segments 1 in the prefabrication factory and transport them to the site. Specifically, the reinforcement in the prefabricated pipe gallery segment 1 needs to consider additional reinforcement or strengthening treatment for the part that directly contacts the load-bearing roller 31. The prefabricated pipe gallery segment 1 can be transported with the construction flow or uniformly loaded according to the actual scale of the site.

[0031] S2. Excavate the tunnel foundation pit 2 within the construction red line, complete the slope support within the tunnel foundation pit 2, and perform pit bottom treatment on the bottom of the tunnel foundation pit to form a stable base layer 21. Specifically, the entire excavation of the tunnel foundation pit 2 adopts conventional earthwork excavation technology and transportation tools, and the slope support and pit bottom treatment are also existing technologies adopted according to the actual situation on site. The base layer 21 is a stable concrete layer or soil surface. When the top surface of the base layer 21 is a concrete layer, the concrete ground beam 3 can be cast together with the base layer 21.

[0032] S3. Concrete ground beams 3 are constructed on the base layer 21, and bearing rollers 31 are placed thereon at intervals; specifically, the upper surface of the concrete ground beam 3 is horizontal and flush, and has no gaps, and can be leveled and straightened by on-site construction personnel using high-strength mortar. Baffles, blocks and other measures can be set on both sides of the concrete ground beam 3 to prevent the bearing rollers 31 from being offset or misaligned.

[0033] S4. Fix a steel cable pulling device 4 at one end of the tunnel foundation pit 2, and fix one end of the pulling cable 41 on the steel cable pulling device 4; specifically, the steel cable pulling device 4 can select a single or multiple winches, and the pulling range of the steel cable pulling device 4 needs to be greater than the length of the tunnel foundation pit 2.

[0034] S5. At the other end of the tunnel foundation pit 2, at least one prefabricated tunnel segment 1 is placed on the load-bearing roller 31 using a lifting device, a pulling bracket 13 is installed in one of the prefabricated tunnel segments 1, the other end of the pulling cable 41 is connected to the pulling bracket 13, a tying structure 12 is installed in the prefabricated tunnel segment 1, and a connecting cable is tied and pulled between the tying structures 12 of any two adjacent prefabricated tunnel segments 1; specifically, before formal pulling, it is necessary to strictly check whether each tying structure 12 is fixed in place and whether the pulling cable 41 is securely tied to avoid disconnection between the prefabricated tunnel segments 1 during the construction process.

[0035] S6. Start the steel cable pulling device 4 so that the pulling cable 41 drives the prefabricated pipe gallery segments 1 connected by several connecting cables 121 located at one end of the pipe gallery foundation pit 2, and pulls them to the designated position along the concrete ground beam 3 and fixes them, and removes the pulling bracket 13 and the cable binding structure 12; specifically, during the pulling process, a special person is required to check whether there is an uneven arrangement of the load-bearing rollers 31 between the prefabricated pipe gallery segments 1. If an uneven arrangement occurs, the pulling must be stopped and additional load-bearing rollers 31 must be placed on the concrete ground beam 3.

[0036] S7. Repeat steps S5-S6 to complete the installation of all prefabricated pipe gallery segments 1 in the pipe gallery foundation pit 2, and ensure that the reduced diameter segment 11 of any prefabricated pipe gallery segment 1 is inserted into the outer segment 16 of the adjacent prefabricated pipe gallery segment 1; specifically, in the present technical scheme, since the pulling point of the prefabricated pipe gallery segments 1 pulled by the same batch is located at the first prefabricated pipe gallery segment 1 of the batch, when the first prefabricated pipe gallery segment 1 of the batch is pressed against the prefabricated pipe gallery segment 1 of the previous batch under pulling, the remaining prefabricated pipe gallery segments 1 of the batch are still connected by the connecting rope 121, and the gaps between them need to be eliminated by the forward movement of the prefabricated pipe gallery segments 1 of the next pulling batch.

[0037] S8, temporarily block the grouting holes 17, and pour a fine stone concrete layer 22 on the base layer 21, the surface of the fine stone concrete layer 22 outside the prefabricated pipe gallery segment 1 is higher than the bottom surface of the prefabricated pipe gallery segment 1; specifically, use a woven bag or other easily removable breathable components to block the grouting holes 17 to ensure that the slurry does not enter the interior of the prefabricated pipe gallery segment 1 during the subsequent concrete pouring process. Before the formal pouring, it is necessary to check the sealing conditions between the prefabricated pipe gallery segments 1 segment by segment. When any two adjacent prefabricated pipe gallery segments 1 are ensured to form a matching nested state, the pouring operation of the fine stone concrete layer 22 can be carried out. During the pouring, the concrete can easily flow from the concrete ground beam 3 and the outer bottom surface of the prefabricated pipe gallery segment 1 to the bottom of the prefabricated pipe gallery segment 1, and the prefabricated pipe gallery segment 1, the concrete ground beam 3, the load-bearing roller 31 and the fine stone concrete layer 22 are cast as a whole.

[0038] S9. After the initial setting of the fine stone concrete layer 22, secondary grouting is carried out through the grouting holes 17 from the prefabricated pipe gallery segment 1. Specifically, about 12 hours after the pouring of the fine stone concrete layer 22 is completed or after the initial setting, the on-site construction personnel can reopen the blockage in the grouting holes 17 from the inside of the prefabricated pipe gallery segment 1, and carry out secondary grouting after simple excavation. During this process, the grouting liquid can fill the possible gap between the fine stone concrete layer 22 and the outer bottom surface of the prefabricated pipe gallery segment 1.

[0039] S10. After the fine stone concrete layer 22 reaches a strength of more than 50%, backfill the soil until the tunnel foundation pit 2 is filled and leveled.

[0040] S11. Complete the secondary masonry and electromechanical piping in prefabricated pipe gallery segment 1.

[0041] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A large prefabricated pipe gallery installed at the bottom of a pipe gallery foundation pit (2), characterized in that: include: A plurality of concrete ground beams (3) with horizontal top surfaces and arranged side by side along the length of the tunnel foundation pit (2), wherein a plurality of bearing rollers (31) are arranged at intervals on the upper surfaces of the concrete ground beams (3), and the bearing rollers (31) roll along the length direction of the concrete ground beams (3); A plurality of prefabricated pipe gallery segments (1) connected end to end and having the same cross-section, wherein the prefabricated pipe gallery segments (1) are hollow ring-shaped and have a horizontal outer bottom surface, the outer circumference of one end of the prefabricated pipe gallery segment (1) is contracted inward to form a reduced diameter segment (11), and the outer circumference of the other end of the prefabricated pipe gallery segment (1) is horizontally extended with an outer covering segment (16), the reduced diameter segment (11) of each prefabricated pipe gallery segment (1) is matched and inserted into the outer covering segment (16) of the adjacent prefabricated pipe gallery segment (1), and the outer bottom surface of the prefabricated pipe gallery segment (1) is supported by a plurality of bearing rollers (31).

2. The large prefabricated pipe gallery according to claim 1, characterized in that: The inner side wall of the prefabricated pipe gallery segment (1) is detachably connected to a pulling bracket (13).

3. The large prefabricated pipe gallery according to claim 2, characterized in that: The inner side wall of the prefabricated pipe gallery segment (1) is detachably connected to a plurality of cable binding structures (12), and the cable binding structures (12) of two adjacent prefabricated pipe gallery segments (1) are detachably bound to a plurality of connecting cables (121).

4. The large prefabricated pipe gallery according to claim 3, characterized in that: The tying structure (12) comprises a fixing plate (122) and a tying column (123); the tying column (123) is a stick-shaped structure with one end fixed to the fixing plate (122) and the other end enlarged; the inner wall of the prefabricated pipe gallery segment (1) is provided with a plurality of first fixing holes (120); the fixing plate (122) is provided with matching through holes and is fixed to the inner wall of the prefabricated pipe gallery segment (1) by bolts.

5. The large prefabricated pipe gallery according to claim 4, characterized in that: A grouting through hole (17) communicating the inside and the outside is provided at the bottom of the prefabricated pipe gallery segment (1).

6. The large prefabricated pipe gallery according to claim 5, characterized in that: The reduced diameter section (11) of the prefabricated pipe gallery section (1) is surrounded by a plurality of rubber water stop strips (15).

7. A construction method for a large prefabricated pipe gallery, applied to the large prefabricated pipe gallery described in any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Complete the production of all prefabricated pipe gallery segments (1) in the prefabrication factory and transport them to the site; S2, excavating the tunnel foundation pit (2) within the construction red line, completing the slope support in the tunnel foundation pit (2), and performing pit bottom treatment on the bottom of the tunnel foundation pit (2) to form a stable base layer (21); S3, constructing a concrete ground beam (3) on the base layer (21), and placing load-bearing rollers (31) thereon at intervals; S4. Fixing a steel cable pulling device (4) at one end of the tunnel foundation pit (2), and fixing one end of a pulling cable (41) to the steel cable pulling device (4); S5. At the other end of the tunnel foundation pit (2), at least one prefabricated tunnel segment (1) is placed on a load-bearing roller (31) using a lifting device, a pulling bracket (13) is installed in one of the prefabricated tunnel segments (1), the other end of the pulling cable (41) is connected to the pulling bracket (13), a tying structure (12) is installed in the prefabricated tunnel segment (1), and a connecting cable is tied and pulled between the tying structures (12) of any two adjacent prefabricated tunnel segments (1); S6, starting the steel cable pulling device (4) so ​​that the pulling cable (41) drives the prefabricated pipe gallery segments (1) connected by a plurality of connecting cables (121) located at one end of the pipe gallery foundation pit (2), pulling them along the concrete ground beam (3) to a designated position and fixing them, and removing the pulling bracket (13) and the cable binding structure (12); S7, repeating steps S5-S6 to complete the installation of all prefabricated pipe gallery segments (1) in the pipe gallery foundation pit (2), ensuring that the reduced diameter segment (11) of any prefabricated pipe gallery segment (1) is inserted into the outer package segment (16) of the adjacent prefabricated pipe gallery segment (1); S8, temporarily blocking the grouting through hole (17), pouring a fine stone concrete layer (22) on the base layer (21), wherein the surface of the fine stone concrete layer (22) outside the prefabricated pipe gallery segment (1) is higher than the bottom surface of the prefabricated pipe gallery segment (1); S9, after the fine stone concrete layer (22) is initially set, secondary grouting is performed from the inside of the prefabricated pipe gallery segment (1) through the grouting through hole (17); S10, after the fine stone concrete layer (22) reaches a strength of more than 50%, backfill the soil until the tunnel foundation pit (2) is leveled; S11. Complete the secondary masonry and electromechanical piping in the prefabricated pipe gallery segment (1).

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