A method for installing prefabricated culverts in narrow spaces

Abstract

This invention relates to the field of prefabricated culvert technology, specifically a method for installing prefabricated culverts in narrow spaces, comprising the following steps: S1, arranging a culvert installation device below the existing facility; S2, placing a total station at the starting end of the foundation platform, ensuring that the center point O of the total station and the foundation center axis of the foundation platform are on the same vertical plane; S3, unloading culvert segments onto a sliding device, ensuring that the midpoint E of the end face of the culvert segment facing the total station is on the same vertical plane as the foundation center axis of the foundation platform; S4, placing a positioning mark at the installation point of the first culvert segment, ensuring that the midpoint W of the positioning mark is on the same vertical plane as the foundation center axis of the foundation platform; S5, calculating the traction distance of the traction unit on the sliding device, and sequentially tractioning each culvert segment to the set position using the traction unit; This invention significantly improves the installation speed of culvert segments in narrow spaces and eliminates the need for large mechanical equipment.

Description

Technical Field

[0001] This invention relates to the field of prefabricated culvert technology, specifically a method for installing prefabricated culverts in narrow spaces. Background Technology

[0002] Culverts are an important structural component of highways and municipal roads. With the rapid development of industrialized highway engineering technology, the application of precast culverts is becoming increasingly widespread, and the installation of their precast segments has gradually become a key common problem. On the one hand, urban development and construction are changing rapidly, and the installation of precast culverts often requires passing through existing facilities, especially under bridges and in narrow spaces where roads pass under precast culverts. On the other hand, China's terrain and geological conditions are complex and varied, and the installation environment and conditions for precast culverts are often complex and varied, especially in mountainous and narrow valleys. The installation methods for precast culverts in these special terrains and narrow spaces are not only affected by the weight of the precast segments themselves, but also need to consider terrain conditions, existing facilities, environmental protection, and other factors.

[0003] Existing culvert projects typically use the incremental launching method to install prefabricated culvert segments in narrow spaces (underpasses, road crossings). While this method has minimal or no impact on existing infrastructure, it has several drawbacks: First, it requires support beams and top columns (force transfer columns), resulting in complex machinery, a cumbersome construction process, and significant space requirements. Second, the numerous prefabricated culvert segments necessitate multiple launching operations, leading to slow construction speed and low efficiency. Third, the incremental launching method has poor adaptability; it cannot be used when assembling culvert segments in a circular curve configuration. The jacking method has limited applicability. Besides jacking, some culvert projects use mechanical hoisting to install prefabricated culvert segments in narrow spaces (valley terrain). Mechanical hoisting offers high mobility and mechanization, but it also has certain drawbacks: First, the mechanical equipment required is generally large, requiring a large construction site; second, the installation of prefabricated culverts is a long, linear process, requiring long routes for hoisting equipment and numerous temporary fixing devices, resulting in significant environmental damage and impact. Therefore, these issues urgently need to be addressed. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, this invention provides a method for installing prefabricated culverts in confined spaces. This invention significantly improves the installation speed of culvert segments in confined spaces and eliminates the need for large mechanical equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for installing prefabricated culverts in narrow spaces includes the following steps:

[0007] S1. Install culvert installation equipment below existing facilities;

[0008] The culvert installation device includes a foundation platform arranged on the soil layer and passing under the existing facility. Two sets of parallel first installation slots are opened on the foundation platform along the length direction. The sliding device is installed on the first installation slot and can slide along the first installation slot. The foundation platform is provided with a lifting part that can lift the culvert segment so that the culvert segment can be placed on the sliding device or unloaded from the sliding device. The foundation platform is also provided with a traction part for pulling the culvert segment along the length direction of the first installation slot.

[0009] S2. Place the total station at the beginning of the base platform, so that the center point O of the total station and the foundation center axis of the base platform are on the same vertical plane.

[0010] S3. Unload the culvert segment onto the sliding device and adjust the position of the culvert segment so that the midpoint E of the end face of the culvert segment facing the total station is on the same vertical plane as the foundation center axis of the foundation platform.

[0011] S4. Place positioning marks at the installation point of the first culvert segment, so that the midpoint W of the positioning mark and the foundation center axis of the foundation platform are on the same vertical plane.

[0012] S5. Calculate the traction mileage of the traction unit to the sliding equipment, and use the traction unit to sequentially pull each culvert segment to the set position.

[0013] When the culvert segments are assembled in a straight line, the traction mileage is l i for:

[0014] l i =L OW -L OE -ns;

[0015] Among them, L OW The distance between point O and point W;

[0016] L OE The distance between point O and point E;

[0017] n represents the number of culvert segments that have been installed and put into place;

[0018] S is the length of each culvert segment;

[0019] When the culvert segments are assembled in a circular arc curve pattern, the traction mileage is l i for:

[0020]

[0021] Where R is the radius of the arc curve when each culvert segment is assembled in a circular arc curve manner.

[0022] As a further aspect of the present invention: In step S2, an arbitrary plane is found in front of the total station, and this plane is used as the adjustment plane; the adjustment plane intersects the foundation center axis of the foundation platform at point F, and the adjustment plane intersects the vertices of the inner edges of the two sets of first mounting slots at points G and H. The straight line connecting points F, G, and H is perpendicular to the foundation center axis, thereby adjusting the position of the total station.

[0023] When each culvert segment is assembled in a straight line, l OH =l OG ;

[0024] Among them, l OH The distance between point O and point H;

[0025] l OG This represents the distance between point O and point G.

[0026] When each culvert segment is assembled in a circular arc curve pattern, the following is achieved:

[0027]

[0028] Among them, L OF The distance between point O and point F;

[0029] A is the distance between the inner edges of the two sets of first mounting slots.

[0030] As a further embodiment of the present invention: In step S3, before unloading the culvert segment, mark a point E on the end face of the culvert segment facing the total station. With the highest points on the left and right sides of the end face of the culvert segment facing the total station as points J and K respectively, adjust the position of point E so that the distances between point E and point J and point K are equal.

[0031] When unloading culvert segments, adjust the position of the culvert segments:

[0032] When each culvert segment is assembled in a straight line, l OJ =l OK ;

[0033] Among them, l OJ The distance between point O and point J;

[0034] l OK The distance between point O and point K;

[0035] When each culvert segment is assembled in a circular arc curve pattern, the following is achieved:

[0036]

[0037] Among them, L OE The distance between point O and point E;

[0038] B represents the width of the culvert segment.

[0039] As a further aspect of the present invention: In step S4, the position of the positioning mark is adjusted with the left and right vertices of the positioning mark being points M and N, respectively.

[0040] When each culvert segment is assembled in a straight line, l OM =l ON ;

[0041] Among them, l OM The distance between point O and point M;

[0042] l ON The distance between point O and point N;

[0043] When each culvert segment is assembled in a circular arc curve pattern, the following is achieved:

[0044]

[0045] Among them, L OW The distance between point O and point W;

[0046] C represents the width of the positioning mark.

[0047] As a further aspect of the present invention: In step S5, when the number of culvert segments pulled to the set position reaches three sets, the prestressing tendons are passed through the reserved holes on each culvert segment and anchored in the fixed groove on the last set of culvert segments. The planar position and elevation of the culvert segments are adjusted, and then the prestressing tendons are tensioned and the culvert segments are tightened. After tightening, a connecting structure is installed between adjacent culvert segments. After the installation is completed, the next batch of culvert segments is installed.

[0048] As a further embodiment of the present invention: each culvert segment has a reserved channel extending through the culvert segment along its length; a fixing groove is provided on the inner side of the culvert segment that intersects with the reserved channel; the traction unit is a winch; one end of the traction line passes through the reserved channel and is knotted and fixed in the fixing groove; the other end of the traction line is pulled and wound by the winch, which is the traction unit.

[0049] As a further aspect of the present invention: the reserved ducts are arranged in four groups, located at the four corners of the culvert segment respectively.

[0050] As a further embodiment of the present invention: an I-beam rail is arranged along the length direction in the first mounting groove, and the I-beam rail is fixed in the first mounting groove by anchor bolts, and the sliding device slides in cooperation with the I-beam rail.

[0051] As a further embodiment of the present invention: the sliding device includes at least two sets of trolleys, the two trolleys are arranged in two sets of first mounting slots, the two trolleys are connected and fixed by a connecting frame, and the pulleys at the bottom of the trolleys are engaged with the upper flange of the I-beam rail so that they can slide along the upper flange of the I-beam rail.

[0052] As a further embodiment of the present invention: the foundation platform has a second mounting groove on both sides along the length direction, and the lifting part consists of at least two sets of jacks arranged in the second mounting groove, with the two sets of jacks corresponding to the bottom positions on both sides of the culvert segment.

[0053] Compared with the prior art, the beneficial effects of the present invention are:

[0054] 1. This invention involves creating a first installation slot on a foundation platform beneath existing facilities, and installing a sliding device within the slot. After a truck unloads prefabricated culvert segments, the segments can be directly unloaded onto the sliding device. The culvert segments can then be slid to a designated position using the traction device. This significantly increases the installation speed of culvert segments in confined spaces, and the construction process eliminates the need for large machinery. The entire installation equipment is compact, small, and safe, reducing excavation in mountainous areas and environmental damage. It is green, environmentally friendly, and highly efficient. During the traction process, a total station and positioning markers are placed at both ends of the foundation platform. Marking points are set on the culvert segments. By measuring the positioning markers and marking points on the culvert segments using the total station, the actual traction mileage required for each culvert segment to be assembled in a straight line or a circular curve can be calculated using formulas. This allows the traction unit to pre-set the traction amount and traction each culvert segment into place in one go, eliminating the need for repeated adjustments by personnel and significantly accelerating the traction and installation speed of the culvert segments.

[0055] 2. This invention, through calculation, ensures that the total station, positioning markers, and unloaded culvert segments are all located on the foundation center axis of the foundation platform, ensuring that the position of each marker point remains accurate throughout the calculation process, thus improving the accuracy of traction mileage calculation. After a certain batch of culvert segments is installed, prestressed tendons can be added to the reserved ducts used for traction to reinforce each culvert segment and ensure that each culvert segment is securely fixed during installation.

[0056] 3. In this invention, a reserved channel is formed by drilling holes along the length of the culvert segment, and a fixing groove is opened on the inner side of the culvert base segment so that the reserved channel can pass through the fixing groove. After the traction line is introduced into the reserved channel, the end of the traction line is tied in the fixing groove to fix one end of the traction line. The other end of the traction line is pulled by a winch. When the winch pulls and winds up the traction line, it can drive the culvert segment and the sliding equipment to slide along the first installation groove to the set position. Multiple sets of reserved channels are arranged, so multiple traction lines can be arranged to pull at the same time, which improves the stability of the traction process.

[0057] 4. The present invention uses anchor bolts pre-embedded in the first mounting groove to fix the I-beam rails, so that the I-beam rails can form a sliding rail for the sliding device to slide along the upper flange of the rails; the sliding device consists of two sets of trolleys, which are connected and fixed by a connecting frame, so that they can slide synchronously along the two sets of I-beam rails after being pulled.

[0058] 5. The present invention provides second mounting slots on both sides of the base platform and installs jacks in the second mounting slots, thereby generating a jacking action on the culvert segment, making it easy to load and unload onto the sliding platform. Attached Figure Description

[0059] Figure 1 This is a front view of the culvert installation device in this invention.

[0060] Figure 2 This is a schematic diagram of the culvert segment in this invention.

[0061] Figure 3 This is a schematic diagram showing the state of each culvert segment in the present invention when they are assembled in a straight line.

[0062] Figure 4 This is a schematic diagram showing the installation position of the total station in this invention.

[0063] Figure 5 This is a schematic diagram showing the position of the positioning mark during installation in this invention.

[0064] Figure 6 This is a schematic diagram showing the state of the culvert segments assembled in a circular arc curve manner in this invention.

[0065] In the picture:

[0066] 1. Culvert segment; 11. Reserved duct; 12. Fixing groove;

[0067] 2. Existing facilities; 3. Soil layers;

[0068] 4. Basic platform; 41. First mounting slot; 411. I-beam rail; 412. Anchor bolts;

[0069] 42. Second mounting slot; 421. Jack; 43. Foundation center axis;

[0070] 5. Sliding device; 51. Pulley; 52. Connecting frame;

[0071] 6. Winch; 61. Traction line;

[0072] 7. Total station; 8. Positioning marker. Detailed Implementation

[0073] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] Please see Figures 1-6 In this embodiment of the invention, a method for installing a prefabricated culvert in a narrow space includes the following steps:

[0075] S1. Install culvert installation device below existing facility 2.

[0076] The existing facility 2 includes bridges and underpasses, and the culvert installation device includes a foundation platform 4 arranged above the soil layer 3 and passing under the existing facility 2. The existing facility 2 of the present invention can also be a mountain cave or valley, that is, the present invention can be applied to underpasses of bridges and road facilities, and can also be used for the installation of culverts in mountain valleys.

[0077] The material of the foundation platform 4 is not limited, but reinforced concrete is preferred. To accommodate different culvert assembly methods, such as straight installation and curved installation, the foundation platform 4 is adapted to be both straight and curved.

[0078] Two sets of parallel first mounting slots 41 are provided on the base platform 4 along the length direction. I-beam rails 411 are arranged in both sets of first mounting slots 41 along the length direction of the slot. The I-beam rails 411 are fixed in the first mounting slots 41 by anchor bolts 412.

[0079] Each of the two sets of I-beam rails 411 is equipped with a trolley 51 that can slide along the I-beam rail 411. The pulley of the trolley 51 is engaged with the upper flange of the I-beam rail 411, thus allowing it to slide along the I-beam rail 411. The two sets of trolleys 51 are connected and fixed together by a connecting frame 52, which is either welded to or hinged to the two sets of trolleys 51. The two sets of trolleys 51 and the connecting frame 52 together constitute the sliding device 5.

[0080] Two sets of symmetrically arranged second mounting slots 42 are provided on both sides of the base platform 4 along its length. Removable jacks 421 are arranged within the second mounting slots 42. After the culvert segment 1 is placed on the sliding device 5, the positions of the second mounting slots 42 correspond precisely to the positions on both sides of the culvert segment 1, allowing the jacks 421 to directly contact the bottom of both sides of the culvert segment 1, thereby lifting or lowering the culvert segment 1. Preferably, two or four sets of jacks 421 are arranged.

[0081] At the four corners of the end face of the culvert segment 1, reserved channels 11 are provided along the length of the culvert segment 1. Four sets of fixing grooves 12 are provided in the middle of the inner side of the culvert segment 1, and the four sets of reserved channels 11 pass through the corresponding fixing grooves 12.

[0082] A winch 6 is installed at the end of the base platform 4. One end of the traction line 61 passes through the reserved hole 11 and is knotted and fixed in the fixing groove 12. The other end of the traction line 61 is pulled and wound by the winch 6. When the winch 6 pulls and wound the traction line 61, it drives the culvert segment 1 and the sliding device 5 to slide along the first mounting groove 41 and move to the set position.

[0083] The number of traction lines 61 is not limited, but preferably two sets are arranged, passing through two sets of reserved channels 11 below the culvert segment 1, and being wound up by the winch 6 after the ends are closed. The traction lines 61 are preferably steel wire ropes.

[0084] The distance between the side of culvert segment 1 and the surrounding soil layer shall not be less than 200mm, and the distance between the top of culvert segment 1 and the existing facility 2 shall not be less than 200mm.

[0085] When setting up the foundation platform 4, first, the location and lines are laid out, the site is cleared and excavated, and the foundation platform 4 is formed by pouring concrete. The first installation groove 41 and the second installation groove 42 are pre-set, and the anchor bolts 412 are pre-embedded in the first installation groove 41. After the anchor bolts 412 are pre-embedded, the I-beam rails 411 are laid in the first installation groove 41 and bolted together with the anchor bolts 412. Then, the sliding device 5 is installed on the I-beam rails 411.

[0086] S2. Place the total station 7 at the starting end of the base platform 4, so that the center point O of the total station 7 and the base center axis 43 of the base platform 4 are on the same vertical plane.

[0087] Find any plane in front of the total station 7 and use it as the adjustment plane. The adjustment plane intersects the foundation center axis 43 of the foundation platform 4 at point F. The adjustment plane intersects the vertices of the inner sides of the two sets of first mounting slots 41 at points G and H. The straight line connecting points F, G, and H is perpendicular to the foundation center axis 43. Adjust the position of the total station 7 in this way.

[0088] When each culvert segment 1 is assembled in a straight line, so that l OH =lOG ;

[0089] Among them, l OH The distance between point O and point H;

[0090] l OG This represents the distance between point O and point G.

[0091] When each culvert segment 1 is assembled in a circular arc curve manner, the following shall be achieved:

[0092]

[0093] Among them, L OF The distance between point O and point F;

[0094] A is the distance between the inner edges of the two sets of first mounting slots 41.

[0095] S3. Unload culvert segment 1 onto sliding device 5, and adjust the position of culvert segment 1 so that the midpoint E of the end face of culvert segment 1 facing the total station 7 is on the same vertical plane as the foundation center axis 43 of the foundation platform 4.

[0096] The prefabricated culvert segment 1 is unloaded from the truck onto the sliding device 5. After unloading, the traction line 61 is passed through the reserved channel 11 and tied and locked in the fixing groove 12. Then, the culvert segment 1 is pulled by the winch 6.

[0097] Before unloading culvert segment 1, mark a point E on the end face of culvert segment 1 facing the total station 7. Take the highest points on the left and right sides of the end face of culvert segment 1 facing the total station 7 as points J and K, respectively. Adjust the position of point E so that the distances from point E to point J and point K are equal.

[0098] When unloading culvert segment 1, adjust the position of culvert segment 1:

[0099] When each culvert segment 1 is assembled in a straight line, so that l OJ =l OK ;

[0100] Among them, l OJ The distance between point O and point J;

[0101] l OK The distance between point O and point K;

[0102] When each culvert segment 1 is assembled in a circular arc curve manner, the following shall be achieved:

[0103]

[0104] Among them, L OE The distance between point O and point E;

[0105] B represents the width of culvert segment 1.

[0106] S4. Place a positioning mark 8 at the installation point of the first culvert segment 1, so that the midpoint W of the positioning mark 8 and the foundation center axis 43 of the foundation platform 4 are on the same vertical plane.

[0107] Adjust the position of positioning mark 8, with points M and N on its left and right sides respectively:

[0108] When each culvert segment 1 is assembled in a straight line, so that l OM =l ON ;

[0109] Among them, l OM The distance between point O and point M;

[0110] l ON The distance between point O and point N;

[0111] When each culvert segment 1 is assembled in a circular arc curve manner, the following shall be achieved:

[0112]

[0113] Among them, L OW The distance between point O and point W;

[0114] C represents the width of the positioning mark 8.

[0115] S5. Calculate the traction mileage of the traction unit to the sliding device 5, and use the traction unit to pull each culvert segment 1 to the set position in sequence.

[0116] When each culvert segment 1 is assembled in a straight line, the traction mileage l i for:

[0117] l i =L OW -L OE -ns;

[0118] Among them, L OW The distance between point O and point W;

[0119] L OE The distance between point O and point E;

[0120] n represents the number of culvert segments 1 that have been installed and put into place;

[0121] S is the length of each culvert segment 1;

[0122] When each culvert segment 1 is assembled in a circular arc curve pattern, the traction mileage l i for:

[0123]

[0124] Where R is the radius of the arc curve when each culvert segment 1 is assembled in a circular arc curve manner.

[0125] When culvert segment 1 reaches the predetermined position, jacks 421 are placed at the four corners of the bottom of culvert segment 1 to lift culvert segment 1, and the sliding device 5 is removed to reset it to the initial working position. After the sliding device 5 is removed, culvert segment 1 is lowered onto the foundation platform 4 using jacks 421, and then jacks 421 are removed to continue the installation of the next culvert segment 1.

[0126] When the number of culvert segments 1 pulled to the set position reaches three sets, the prestressed tendons are passed through the reserved holes 11 on each culvert segment 1 and anchored in the fixing groove 12 on the last set of culvert segments 1. The plane position and elevation of the culvert segments 1 are adjusted, and the prestressed tendons are tensioned and the culvert segments 1 are tightened. After tightening, the connecting structure is installed between adjacent culvert segments 1. After the installation is completed, the next batch of culvert segments 1 is installed.

[0127] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0128] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0129] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0130] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0131] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for installing prefabricated culverts in narrow spaces, characterized in that, Includes the following steps: S1. Install culvert installation device below the existing facility (2); The culvert installation device includes a foundation platform (4) arranged on the soil layer (3) and passing under the existing facility (2). Two sets of parallel first installation slots (41) are opened on the foundation platform (4) along the length direction. The sliding device (5) is installed on the first installation slot (41) and can slide along the first installation slot (41). The foundation platform (4) is provided with a lifting part that can lift the culvert segment (1) so that the culvert segment (1) can be placed on the sliding device (5) or unloaded from the sliding device (5). The foundation platform (4) is also provided with a traction part for pulling the culvert segment (1) along the length direction of the first installation slot (41). S2. Place the total station (7) at the beginning of the base platform (4) so ​​that the center point O of the total station (7) and the base center axis (43) of the base platform (4) are on the same vertical plane. S3. Unload the culvert segment (1) onto the sliding device (5), and adjust the position of the culvert segment (1) so that the midpoint E of the end face of the culvert segment (1) facing the total station (7) is on the same vertical plane as the foundation center axis (43) of the foundation platform (4). S4. Place a positioning mark (8) at the installation point of the first culvert segment (1) so that the midpoint W of the positioning mark (8) and the foundation center axis (43) of the foundation platform (4) are on the same vertical plane. S5. Calculate the traction mileage of the traction unit to the sliding device (5), and use the traction unit to pull each culvert segment (1) to the set position in sequence; When each culvert segment (1) is assembled in a straight line, the traction mileage l i for: L i =L OW -L OE -ns; Among them, L OW The distance between point O and point W; L OE The distance between point O and point E; n represents the number of culvert segments (1) that have been installed and put into place; S is the length of each culvert segment (1); When each culvert segment (1) is assembled in a circular arc curve manner, the traction mileage l i for: Wherein, R is the radius of the arc curve when each culvert segment (1) is assembled in a circular arc curve manner; In step S2, find any plane in front of the total station (7) and use this plane as the adjustment plane; the adjustment plane intersects the foundation center axis (43) of the foundation platform (4) at point F, and the adjustment plane intersects the vertices of the inner edges of the two sets of first mounting slots (41) at points G and H. The straight line connecting points F, G, and H is perpendicular to the foundation center axis (43), thereby adjusting the position of the total station (7): When each culvert segment (1) is assembled in a straight line, so that l OH =l OG ; Among them, l OH The distance between point O and point H; l OG This represents the distance between point O and point G. When each culvert segment (1) is assembled in a circular arc curve manner, the following shall be achieved: Among them, L OF The distance between point O and point F; A is the distance between the inner edges of the two sets of first mounting slots (41).

2. The method for installing a prefabricated culvert in a narrow space according to claim 1, characterized in that, In step S3, before unloading the culvert segment (1), mark a point E on the end face of the culvert segment (1) facing the total station (7). Take the highest points on the left and right sides of the end face of the culvert segment (1) facing the total station (7) as points J and K, respectively, and adjust the position of point E so that the distance between point E and point J and point K are equal. When unloading culvert segment (1), adjust the position of culvert segment (1): When each culvert segment (1) is assembled in a straight line, so that l OJ =l OK ; Among them, l OJ The distance between point O and point J; l OK The distance between point O and point K; When each culvert segment (1) is assembled in a circular arc curve manner, the following shall be achieved: Among them, L OE The distance between point O and point E; B is the width of culvert segment (1).

3. The method for installing a prefabricated culvert in a narrow space according to claim 1, characterized in that, In step S4, the position of the positioning mark (8) is adjusted with the left and right vertices of the positioning mark (8) being points M and N, respectively: When each culvert segment (1) is assembled in a straight line, so that l OM =l ON ; Among them, l OM The distance between point O and point M; l ON The distance between point O and point N; When each culvert segment (1) is assembled in a circular arc curve manner, the following shall be achieved: Among them, L OW The distance between point O and point W; C is the width of the positioning mark (8).

4. A method for installing a prefabricated culvert in a narrow space according to any one of claims 1 to 3, characterized in that, In step S5, when the number of culvert segments (1) pulled to the set position reaches three sets, the prestressed tendons are passed through the reserved holes (11) on each culvert segment (1) and anchored in the fixing groove (12) on the last set of culvert segments (1). The plane position and elevation of the culvert segments (1) are adjusted, and the prestressed tendons are tensioned and the culvert segments (1) are tightened. After tightening, the connecting structure is installed between adjacent culvert segments (1). After the installation is completed, the next batch of culvert segments (1) is installed.

5. A method for installing a prefabricated culvert in a narrow space according to any one of claims 1 to 3, characterized in that, Each culvert segment (1) has a reserved channel (11) that runs through it along its length; a fixed groove (12) that intersects with the reserved channel (11) is provided on the inner side of the culvert segment (1); the traction unit is a winch (6); one end of the traction line (61) passes through the reserved channel (11) and is knotted and fixed in the fixed groove (12); the other end of the traction line (61) is pulled and wound by the winch (6); the winch (6) is the traction unit.

6. The method for installing a prefabricated culvert in a narrow space according to claim 5, characterized in that, The reserved ducts (11) are arranged in four groups, located at the four corners of the culvert segment (1).

7. A method for installing a prefabricated culvert in a narrow space according to any one of claims 1 to 3, characterized in that, An I-beam rail (411) is arranged along the length direction in the first mounting groove (41). The I-beam rail (411) is fixed in the first mounting groove (411) by anchor bolts (412). The sliding device (5) slides with the I-beam rail (411).

8. The method for installing a prefabricated culvert in a narrow space according to claim 7, characterized in that, The sliding device (5) includes at least two sets of trolleys (51), which are arranged in two sets of first mounting slots (41). The two trolleys (51) are connected and fixed by a connecting frame (52). The pulleys at the bottom of the trolleys (51) are engaged with the upper flange of the I-beam rail (411) so that they can slide along the upper flange of the I-beam rail (411).

9. A method for installing a prefabricated culvert in a narrow space according to any one of claims 1 to 3, characterized in that, The base platform (4) has a second mounting groove (42) on both sides along the length direction. The lifting part consists of at least two sets of jacks (421) arranged in the second mounting groove (42). The two sets of jacks (421) correspond to the bottom positions on both sides of the culvert segment (1).

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