Construction method of self-anchored arch rib support suitable for narrow site

Abstract

The invention provides a construction method of a self-anchored arch rib support suitable for a narrow site. The construction method comprises the following steps that S1, a wind load self-anchored system is constructed, wherein the wind load self-anchored system comprises an anchoring structure and an expanded foundation; s2, mounting an arch rib bracket body; s3, thrust self-anchoring systems are installed, specifically, after at least two adjacent wind load self-anchoring systems and arch rib support bodies are installed, the thrust self-anchoring systems are installed between the arch rib support bodies and the wind load self-anchoring systems adjacent to the arch rib support bodies, and each thrust self-anchoring system comprises a cable wind rope and a cable wind rope adjusting device; one end of the cable rope is detachably connected with one side of the upper portion of the arch rib support body, and the other end of the cable rope is detachably connected with the expanded foundation through the cable rope adjusting device. The expanded foundation is constructed and serves as an anchoring foundation of the arch rib support body and the cable rope at the same time, horizontal force generated during arch rib section installation can be resisted, and meanwhile the problem that transverse cable wind cannot be arranged for resisting wind loads due to the narrow site is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a construction method of a self-anchored arch rib support suitable for narrow sites. Background Art

[0002] The steel tube concrete arch bridge is a bridge structure composed of steel tubes and concrete. During the construction process, the steel tube can be used as a rigid load-bearing skeleton. The welding work is simple and the hoisting weight is light, which can simplify the construction process and shorten the construction period. The steel tube has the functions of longitudinal main reinforcement and transverse hoops, and can be used as a construction template to facilitate concrete pouring, further improving the convenience of construction while ensuring the stability of the bridge structure.

[0003] Steel tube concrete arch bridges are mostly constructed on land using the support method, that is, a temporary arch rib support is built below the designed position of the arch ring, and the arch rib support is used as a construction platform to build the arch rib and related superstructures. During the construction of the arch rib, since the arch rib is a catenary line, a certain horizontal force will be generated on the arch rib support when it is installed in sections. In order to reduce the influence of the horizontal force on the arch rib alignment, the usual method is to install steel pipes or steel sections between the arch rib supports along the longitudinal bridge direction to connect the arch rib supports to form a whole. However, this will cause a waste of materials, and if the arch rib installation segments are too long, it is easy to become unstable due to the connection slenderness ratio between the supports not meeting the requirements. In addition, considering that the arch rib supports are generally high and narrow structures, the lateral wind load has a greater impact, and there is also a method of installing lateral cable wind to resist its load, but if the site on both sides of the arch bridge is narrow, it is impossible to set up a corresponding wind catch to resist the wind load.

[0004] Therefore, when building an arch bridge in a narrow space, how to construct the arch rib support to ensure the accuracy of the arch rib installation has become one of the focuses of research on steel tube concrete arch bridge construction. Summary of the invention

[0005] In order to solve the above problems pointed out in the background technology, the present invention provides a construction method of a self-anchored arch rib support suitable for narrow sites.

[0006] To achieve the above object, the technical solution of the present invention is: A construction method for a self-anchored arch rib support suitable for a narrow site comprises the following steps: S1. Construction of wind load self-anchoring system: The wind load self-anchoring system includes an anchoring structure and an expanded foundation. The middle and lower parts of the anchoring structure are first driven into the ground foundation and consolidated with the ground foundation. Then the expanded foundation is poured. The expanded foundation is consolidated with the upper part of the anchoring structure. S2. Installing the arch rib support body: Install the construction arch rib support body on the expanded foundation, and install a support walking system on one side of the construction arch rib support body; S3. Install the thrust self-anchoring system: after at least two adjacent wind load self-anchoring systems and the arch rib support body are installed, install the thrust self-anchoring system between the arch rib support body and the wind load self-anchoring system adjacent to the arch rib support body, the thrust self-anchoring system comprises a guy rope and a guy rope adjusting device, one end of the guy rope is detachably connected to one side of the upper portion of the arch rib support body, and the other end is detachably connected to the expanded foundation through the guy rope adjusting device.

[0007] Preferably, in step S2, the construction arch rib support body includes at least one arch rib support body segment, and the supporting walking system includes at least one supporting walking segment. After each arch rib support body segment is constructed, a supporting walking segment is installed on one side of the arch rib support body segment, so that the next arch rib support body segment can be aligned and fixed with the installed arch rib support body segment at the top supporting walking segment.

[0008] Preferably, the supporting walking system includes a ladder bracket, up and down ladders and a rest platform. The ladder bracket is vertically arranged on one side of the arch rib bracket body, extending from the bottom end of the arch rib bracket body to the top of the arch rib bracket body or a position near the top. Up and down ladders are arranged on one side or inside of the ladder bracket, each of the supporting walking segments is provided with the rest platform, and the up and down ladders are disconnected in the area of ​​the rest platform.

[0009] Preferably, the anchoring structure comprises a plurality of anti-pullout anchor rods, the lower and middle parts of which penetrate into the ground foundation, and the upper parts of which pass through the enlarged foundation and are fixed together; The construction steps include: drilling a hole downward in the ground foundation, vertically placing an anti-pulling anchor rod in the hole and positioning it, grouting from bottom to top through a grouting pipe, pouring an expanded foundation after reaching a certain strength, ensuring that the top of the anti-pulling anchor rod passes through the expanded foundation, and pre-embedding reinforcing steel bars in the expanded foundation close to its top surface and close to the anti-pulling anchor rod, after the expanded foundation is consolidated, placing an anchor plate from the top of the anti-pulling anchor rod, and finally screwing in a nut to press against the top surface of the anchor plate and make the anchor plate press against the top surface of the expanded foundation; Alternatively: drill a hole downward in the ground foundation, reserve an anchor channel in the template of the expanded foundation, then cast the expanded foundation, embed reinforcing steel bars in the expanded foundation near its top surface and close to the anchor channel, and after the expanded foundation has been consolidated to a certain strength, pass the pull-out anchor through the anchor channel and deep into the hole in the ground foundation, and inject grout from bottom to top through the grouting pipe to consolidate the pull-out anchor with the ground foundation and the expanded foundation, then put in the anchor plate from the top of the pull-out anchor, and finally screw in the nut to press against the top surface of the anchor plate and make the anchor plate press against the top surface of the expanded foundation.

[0010] Preferably, step S4 is also included, which includes: installing an adjustable support system on the top of the arch rib support body, the adjustable support system including a support beam, a top support pad and a jack, first installing the support beam along the transverse direction on the top of the arch rib support body, and then fixing the top support pad and the jack on the top surface of the support beam, the top support pad includes two top support pad units for matching the bottom sides of the corresponding supporting arch rib chord, and the jack is installed between the two top support pad units.

[0011] Preferably, each set of thrust self-anchoring systems also includes a support column ear plate and a base ear plate. The support column ear plate is fixed to one side of the upper part of the arch rib support body, and the base ear plate is fixed to one side of the top surface of the expanded foundation. Then, one end of the guy rope is connected to the support column ear plate, and the other end is connected to the movable end of the guy rope adjusting device. The fixed end of the guy rope adjusting device is connected to the expanded foundation through the base ear plate. The length of the guy rope adjusting device is adjusted to keep the guy rope in a tensioned state.

[0012] Preferably, one end of the guy rope is connected to a shackle, and is detachably connected to the bracket column ear plate through the shackle.

[0013] Preferably, a thrust self-anchoring system is provided on one side of the arch rib support body which is not fixed on the arch rib arch seat and to which the corresponding supported arch rib segment is not connected with a cable wind rope.

[0014] Preferably, each of the arch rib support bodies includes four support columns forming a cube shape, and each set of thrust self-anchoring systems includes two of the guy ropes, one end of the two guy ropes are respectively connected to the two support columns at the front / rear of the arch rib support body, and the other end is respectively connected to the intersection line of the extension line of the connecting line at the bottom ends of the two support columns on the left or right side and the adjacent expanded foundation, or connected to the outside of the intersection line of the extension line of the connecting line at the bottom ends of the two support columns on the same side and the adjacent expanded foundation.

[0015] Preferably, the guy rope adjusting device is a hand winch.

[0016] The above-mentioned construction method of the self-anchored arch rib support suitable for narrow sites has the following advantages: (1) The present invention constructs the anchor point of the cable wind rope in the thrust self-anchoring system on the expanded foundation of the adjacent thrust self-anchoring system, which effectively solves the problem that it is impossible to set up a transverse cable wind to resist wind load in a narrow site.

[0017] (2) The present invention achieves the purpose of resisting the horizontal force generated when the arch rib segment is installed by arranging a thrust self-anchor system between the arch rib support body and the wind load self-anchor system adjacent to the arch rib support body, thereby avoiding the installation of longitudinal connections between the arch rib supports and avoiding material waste.

[0018] (3) The present invention solves the problem of assembling the arch rib support segments and installing the upper and lower channels of the arch rib by providing a supporting walking system.

[0019] (4) The present invention further provides an adjustable support system at the top of the arch rib support, which can facilitate rapid adjustment of the elevation when the arch rib segments are aligned. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the top view structure.

[0022] Figure 3 It is a structural schematic diagram of an embodiment of a wind load self-anchoring system.

[0023] Figure 4 yes Figure 3 Schematic diagram of the right view structure.

[0024] Figure 5 yes Figure 4 Schematic diagram of the top view structure.

[0025] Figure 6 It is an enlarged structural diagram of the pull-out anchor.

[0026] Figure 7 It is a structural schematic diagram of an embodiment of a thrust self-anchoring system.

[0027] Figure 8 It is a structural schematic diagram of the adjustable support system.

[0028] Fig. 9 yes Figure 8 Schematic diagram of the right view structure.

[0029] Fig.10 yes Figure 8 Schematic diagram of the top view structure.

[0030] Fig.11 It is a structural schematic diagram of an embodiment of a rest platform.

[0031] Fig.12 yes Fig.11 Schematic diagram of the right view structure.

[0032] Fig.13 yes Fig.11 Schematic diagram of the top view structure.

[0033] In the figure, there are a wind load self-anchoring system 100, an enlarged foundation 110, reinforced steel bars 111, a pull-out anchor rod 120, a pull-out anchor rod body 121, a nut 122, an anchor plate 123, a grouting pipe 124, an arch rib support body 200, a support column 210, a thrust self-anchoring system 300, a support column ear plate 310, a shackle 320, a cable wind rope 330, a hand winch 340, a foundation ear plate 350, an adjustable support system 400, a jack 410, a support beam 420, a top support pad 430, a support walking system 500, a rest platform 510, an up and down ladder 520, and a ladder support 530. DETAILED DESCRIPTION

[0034] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] A construction method for a self-anchored arch rib support suitable for a narrow site comprises the following steps: S1. Construction of wind load self-anchoring system 100: The wind load self-anchoring system 100 includes an anchoring structure and an enlarged foundation 110. First, the middle and lower parts of the anchoring structure are driven into the ground foundation and consolidated with the ground foundation. Then, the enlarged foundation 110 is poured, and the enlarged foundation 110 is consolidated with the upper part of the anchoring structure. S2. Installing the arch rib support body 200: Installing the construction arch rib support body 200 on the expanded foundation 110, and installing the support walking system 500 on one side of the construction arch rib support body 200; S3. Install the thrust self-anchoring system: After at least two adjacent wind load self-anchoring systems 100 and arch rib support bodies 200 are installed, install the thrust self-anchoring system 300 between the arch rib support body 200 and the wind load self-anchoring system 100 adjacent to the arch rib support body 200. The thrust self-anchoring system 300 includes a cable wind rope 330 and a cable wind rope adjusting device. One end of the cable wind rope 330 is connected to one side of the upper part of the arch rib support body 200, and the other end is detachably connected to the enlarged foundation 110 through the cable wind rope adjusting device.

[0038] During the arch rib construction, multiple wind load self-anchor systems 100 and arch rib support bodies 200 must be installed in matching order. The installation of multiple wind load self-anchor systems 100 and arch rib support bodies 200 can be carried out simultaneously or sequentially according to the situation. For the thrust self-anchor system, it can be installed after the construction of the corresponding wind load self-anchor system 100 and the arch rib support body 200 is completed, or after all wind load self-anchor systems 100 and arch rib support bodies 200 are completed, they can be installed simultaneously or sequentially.

[0039] A guy rope adjusting device is provided between the enlarged foundation 110 and the guy rope 330, and the guy rope adjusting device can adjust the overall length of the guy rope 330 and the guy rope adjusting device, and tighten the guy rope 330, so as to better resist the wind load and the horizontal force of the installed arch rib segment.

[0040] In this embodiment, the enlarged foundation 110 serves as the anchoring foundation for the arch rib support body 200 and the cable wind rope 330, eliminating the need to install a transverse cable wind anchoring foundation, thereby effectively solving the problem that a transverse cable wind anchoring foundation cannot be set up in a narrow site to resist wind loads, and also effectively shortening the construction period; and by setting a thrust self-anchoring system 300 between the arch rib support body 200 and the wind load self-anchoring system 100 adjacent to the arch rib support body 200, the purpose of resisting the horizontal force generated during the installation of the arch rib segment can be achieved, thereby avoiding the installation of longitudinal connections between the arch rib supports and avoiding material waste.

[0041] Preferably, in step S2, the construction arch rib support body 200 includes at least one arch rib support body segment, and the support walking system 500 includes at least one support walking segment. After each arch rib support body segment is constructed, a support walking segment is installed on one side of the arch rib support body segment, so that the next arch rib support body segment and the installed arch rib support body segment can be aligned and fixed at the top support walking segment. In addition, the arch rib support body segments are generally connected by flanges and bolts, which makes construction more convenient. After walking to the top support walking segment, a construction platform can be installed to complete the connection between the arch rib support body segments. This embodiment solves the problem of assembling arch rib support segments and installing upper and lower channels of arch ribs by setting up a support walking system 500.

[0042] Preferably, this embodiment provides a specific walking support system 500, which includes a ladder bracket 530, an up and down ladder 520 and a rest platform 510. Figure 11-13 As shown ( Figure 11-13 The main figure shows the rest platform 510, and the ladder bracket 530 and the upper and lower ladders 520 above and below the rest platform 510 are not shown. The ladder bracket 530 is vertically arranged on one side of the arch rib bracket body 200, combined with Fig.13 As shown, this embodiment illustrates that on one of the inner sides of the arch rib support body 200, the ladder support 530 extends from the bottom end of the arch rib support body 200 to the top of the arch rib support body 200 or a position close to the top, and can be made of steel pipe columns, and cross-links can be welded between the steel pipe columns to connect them as a whole; an upper and lower ladder 520 is arranged on one side or inside the ladder support 530, and the upper and lower ladders 520 can be straight and vertically upward, or can be bent and ascended alternately left and right. The upper and lower ladders 520 are preferably matched with a back cage to ensure the safety of construction workers going up and down during construction; each supporting walking segment is provided with a rest platform 510, and the upper and lower ladders 520 are disconnected in the area of ​​the rest platform 510. The rest platform 510 is generally erected on the cross connection on the two opposite sides of the arch rib support, keeping a certain distance from the construction platform.

[0043] Preferably, this embodiment provides a specific anchoring structure, combined with Figure 3-5As shown, the wind load self-anchoring system 100 shown in this embodiment is installed in the land area. Considering the construction period and construction cost, the anchoring structure includes a plurality of anti-pulling anchor rods 120. The lower and middle parts of the anti-pulling anchor rods 120 penetrate into the ground foundation, and the upper parts pass through the expanded foundation 110 and are fixed together. The expanded foundation 110 of this embodiment is a reinforced concrete foundation. The construction steps include: the pull-out anchor 120 includes a pull-out anchor body 121, a hole is drilled downward in the ground foundation, the pull-out anchor body 121 is vertically placed in the hole and positioned, grouting is performed from bottom to top through a grouting pipe 124, and after reaching a certain strength, the expanded foundation 110 is poured to ensure that the top of the pull-out anchor body 121 passes through the expanded foundation 110, and reinforcing steel bars 111 are pre-buried in the expanded foundation 110 near its top surface and near the pull-out anchor body 121 to increase the compressive capacity of the expanded foundation 110. After the expanded foundation 110 is consolidated, an anchor plate 123 with a through hole is placed from the top of the pull-out anchor body 121, and finally a nut 122 is screwed in to resist the top surface of the anchor plate 123 and the anchor plate 123 is pressed against the top surface of the expanded foundation 110. In addition, the construction steps can also be: Drill a hole downward in the ground foundation, reserve an anchor channel in the template of the expanded foundation 110 (the anchor channel can be reserved by inserting a PVC pipe in the template), then cast the expanded foundation 110, embed reinforcing steel bars 111 in the expanded foundation near its top surface and near the anchor channel, and after the expanded foundation 110 is consolidated to a certain strength, pass the pull-out anchor body 121 through the anchor channel and penetrate into the hole of the ground foundation, and grout from bottom to top through the grouting pipe 124, so that the slurry overflows from the expanded foundation 110, and the slurry consolidates the pull-out anchor 120 with the ground foundation and the expanded foundation 110, and then put the anchor plate 123 from the top of the pull-out anchor body 121, and finally screw in the nut 122 to press against the top surface of the anchor plate 123 and make the anchor plate 123 press against the top surface of the expanded foundation 110. In addition, according to actual conditions, the anchoring structure can also adopt various pile structures, such as bored piles.

[0044] Preferably, the method further comprises step S4, which comprises: installing an adjustable support system 400 on the top of the arch rib support body 200, combining Figure 7-9As shown, the adjustable support system 400 includes a support beam 420, a top support pad 430 and a jack 410. The support beam 420 is first installed on the arch rib support body 200 along the horizontal bridge direction, and then the top support pad 430 and the jack 410 are fixed on the top surface of the support beam 420. The top support pad 430 includes two top support pad units, which are used to match the bottom sides of the corresponding supporting arch rib chord rods. The jack 410 is installed between the two top support pad units. By adjusting the extended length of the jack 410, the elevation can be quickly adjusted when the arch rib segment is aligned. Among them: the number of top support pads 430 matches the number of arch rib chord rods above the arch rib support body 200. For example, in this embodiment, there are 4 chord rods at the bottom of the arch rib segment (2 left chord rods and 2 right chord rods), and there are 2 top support pads 430. Regarding the fixing method of the support beam 420, it is determined according to the structure of the arch rib support body 200. The arch rib support body 200 generally includes four support columns 210, and two support beams 420 are provided, which are respectively fixed on the two front support columns 210 and the two rear support columns 210, so that the load of the support beam 420 can be evenly transmitted to the arch rib support body 200. In addition, in this embodiment, the support beam 420 is welded by three-piece I-beams, and the jack 410 is a screw jack.

[0045] Preferably, combined Figure 6 As shown, each set of thrust self-anchoring system 300 also includes a bracket column ear plate 310 and a base ear plate 350. The bracket column ear plate 310 is fixed to one side of the upper part of the arch rib bracket body 200, and the base ear plate 350 is fixed to one side of the top surface of the enlarged foundation 110. Then, one end of the cable wind rope 330 is connected to the bracket column ear plate 310, and the other end is connected to the movable end of the cable wind rope adjustment device. The fixed end of the cable wind rope adjustment device is connected to the enlarged foundation 110 through the base ear plate 350. The length of the cable wind rope adjustment device is adjusted to keep the cable wind rope 330 in a tensioned state. This embodiment adopts an ear plate structure for connection. The ear plate is provided with corresponding ear holes, which can facilitate the tying of the cable wind rope 330 and is connected to the corresponding cable wind rope adjustment device through a pin shaft or a hook body and other structures. It is easy to operate and can better improve the construction efficiency.

[0046] Preferably, one end of the guy rope 330 is connected to a shackle 320, which is detachably connected to the bracket column ear plate 310 through the shackle 320. Before installing the guy rope 330, the shackle 320 is pre-connected to one end of the guy rope 330. Then, when installing the thrust self-anchoring system 300, the shackle 320 is directly hung on the bracket column ear plate 310 to quickly achieve the connection between the guy rope 330 and the arch rib bracket body 200.

[0047] Preferably, in order to reduce construction costs while taking into account the safety and accuracy of construction, this embodiment fully considers the number of thrust self-anchoring systems 300, wherein the side of the arch rib support body 200 that is not fixed on the arch rib arch seat and to which the corresponding supported arch rib segment is connected without a cable wind rope 330 is provided with a thrust self-anchoring system 300. Figure 1 To explain the above settings, Figure 1 The arch rib bracket shown in the figure is used to install the arch rib segment on one side, and the arch rib segment on the other side can be installed by the bracket method, or by the rotation method or other methods; in the installation of the arch rib segment on one side, the rear enlarged foundation 110 is installed on the arch rib arch seat (the rightmost enlarged foundation 110 is shown in the figure). Since the arch ribs of the arch seat are relatively stable, the arch rib bracket body 200 installed on the arch rib arch seat is not provided with a cable wind rope 330 connected to its top side. The arch rib segment supported by the upper part of the front enlarged foundation 110 (the leftmost enlarged foundation 110 is shown in the figure) is the arch rib segment on the other side, and the arch rib segment on the other side is tensioned by a cable wind rope, so the arch rib bracket body 200 is not provided with a cable wind rope 330 connected to its top side.

[0048] Preferably, each arch rib support body 200 includes four support columns 210 that form a cube shape. Of course, the four support columns 210 are also connected by a transverse connection. This is the existing structure of the arch rib support body 200 and will not be described in detail here. Each thrust self-anchor system 300 includes two cables 330, and one end of the two cables 330 is connected to the two support columns 210 at the front / rear of the arch rib support body 200 in a one-to-one correspondence ( Figure 2 The left side is the front part and the right side is the rear part shown in the figure), and the other end is respectively connected to the intersection line of the extension line of the bottom end of the two support columns 210 on the left or right side and the adjacent enlarged foundation 110 (i.e. Figure 2 As shown), that is, the spacing between the two cables 330 is equal to the spacing between the two support columns 210, and is arranged along the longitudinal direction of the arch rib, so that the horizontal force generated when the arch rib segment is installed can be better resisted, or it is connected to the outside of the intersection line of the extension line of the connecting line at the bottom of the two support columns 210 on the left or right side and the adjacent expanded foundation 110, that is, the two cables 330 are inclined outward, and the spacing between the two cables 330 is greater than the spacing between the two support columns 210.

[0049] Preferably, the present embodiment further provides a guy rope adjusting device, which is a hand winch 340, and the length of the chain or wire rope of the hand winch 340 can be adjusted to achieve overall length adjustment of the guy rope 330 and the guy rope adjusting device.

Claims

1. A construction method for a self-anchored arch rib support suitable for narrow sites, characterized in that The following steps are involved: S1. Construction of wind load self-anchoring system: The wind load self-anchoring system includes an anchoring structure and an expanded foundation. The middle and lower parts of the anchoring structure are first driven into the ground foundation and consolidated with the ground foundation. Then the expanded foundation is poured. The expanded foundation is consolidated with the upper part of the anchoring structure. S2. Installing the arch rib support body: Install the construction arch rib support body on the expanded foundation, and install a support walking system on one side of the construction arch rib support body; S3. Install the thrust self-anchoring system: after at least two adjacent wind load self-anchoring systems and the arch rib support body are installed, install the thrust self-anchoring system between the arch rib support body and the wind load self-anchoring system adjacent to the arch rib support body, the thrust self-anchoring system comprises a guy rope and a guy rope adjusting device, one end of the guy rope is detachably connected to one side of the upper portion of the arch rib support body, and the other end is detachably connected to the expanded foundation through the guy rope adjusting device.

2. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1 is characterized in that: In step S2, the construction arch rib support body includes at least one arch rib support body segment, and the supporting walking system includes at least one supporting walking segment. After each arch rib support body segment is constructed, a supporting walking segment is installed on one side of the arch rib support body segment, so that the next arch rib support body segment can be aligned and fixed with the installed arch rib support body segment at the top supporting walking segment.

3. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 2 is characterized in that: The supporting walking system includes a ladder bracket, an up-and-down ladder and a rest platform. The ladder bracket is vertically arranged on one side of the arch rib bracket body, extending from the bottom end of the arch rib bracket body to the top of the arch rib bracket body or a position close to the top. The up-and-down ladders are arranged on one side or inside of the ladder bracket, each of the supporting walking segments is provided with the rest platform, and the up-and-down ladders are disconnected in the area of ​​the rest platform.

4. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1, characterized in that: The anchoring structure comprises a plurality of anti-pulling anchor rods, the lower and middle parts of which penetrate into the ground foundation, and the upper parts of which pass through the enlarged foundation and are fixed together; The construction steps include: drilling a hole downward in the ground foundation, vertically placing an anti-pulling anchor rod in the hole and positioning it, grouting from bottom to top through a grouting pipe, pouring an expanded foundation after reaching a certain strength, ensuring that the top of the anti-pulling anchor rod passes through the expanded foundation, and pre-embedding reinforcing steel bars in the expanded foundation close to its top surface and close to the anti-pulling anchor rod, after the expanded foundation is consolidated, placing an anchor plate from the top of the anti-pulling anchor rod, and finally screwing in a nut to press against the top surface of the anchor plate and make the anchor plate press against the top surface of the expanded foundation; Alternatively: drill a hole downward in the ground foundation, reserve an anchor channel in the template of the expanded foundation, then cast the expanded foundation, embed reinforcing steel bars in the expanded foundation near its top surface and close to the anchor channel, and after the expanded foundation has been consolidated to a certain strength, pass the pull-out anchor through the anchor channel and deep into the hole in the ground foundation, and inject grout from bottom to top through the grouting pipe to consolidate the pull-out anchor with the ground foundation and the expanded foundation, then put in the anchor plate from the top of the pull-out anchor, and finally screw in the nut to press against the top surface of the anchor plate and make the anchor plate press against the top surface of the expanded foundation.

5. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1, characterized in that: It also includes step S4, which includes: installing an adjustable support system on the top of the arch rib support body, the adjustable support system including a support beam, a top support pad and a jack, first installing the support beam along the transverse direction on the top of the arch rib support body, and then fixing the top support pad and the jack on the top surface of the support beam, the top support pad includes two top support pad units for matching the bottom sides of the corresponding supporting arch rib chord, and the jack is installed between the two top support pad units.

6. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1, characterized in that: Each set of thrust self-anchoring system also includes a support column ear plate and a foundation ear plate. The support column ear plate is fixed to one side of the upper part of the arch rib support body, and the foundation ear plate is fixed to one side of the top surface of the expanded foundation. Then, one end of the cable wind rope is connected to the support column ear plate, and the other end is connected to the movable end of the cable wind rope adjusting device. The fixed end of the cable wind rope adjusting device is connected to the expanded foundation through the foundation ear plate. The length of the cable wind rope adjusting device is adjusted to keep the cable wind rope in a tensioned state.

7. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 6, characterized in that: One end of the guy rope is connected with a shackle, and is detachably connected to the bracket column ear plate through the shackle.

8. The construction method of the self-anchored arch rib support suitable for narrow sites according to any one of claims 1 to 7, characterized in that: A thrust self-anchoring system is provided on one side of the arch rib support body which is not fixed on the arch rib arch seat and to which the corresponding supported arch rib segment is not connected with a cable wind rope.

9. The construction method of the self-anchored arch rib support suitable for narrow sites according to any one of claims 1 to 7, characterized in that: Each of the arch rib support bodies includes four support columns forming a cube shape, and each set of thrust self-anchoring systems includes two of the guy ropes, one end of the two guy ropes are respectively connected to the two support columns at the front / rear of the arch rib support body, and the other end is respectively connected to the intersection line of the extension line of the connecting line at the bottom ends of the two support columns on the left or right side and the adjacent expanded foundation, or connected to the outside of the intersection line of the extension line of the connecting line at the bottom ends of the two support columns on the same side and the adjacent expanded foundation.

10. The construction method of the self-anchored arch rib support suitable for narrow sites according to any one of claims 1 to 7, characterized in that: The guy rope adjusting device is a hand winch.

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