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

Abstract

The application provides a construction method of a self-anchored arch rib support suitable for narrow sites, which comprises the following steps: S1. constructing a wind load self-anchored system: the wind load self-anchored system comprises an anchoring structure and an enlarged foundation; S2. installing an arch rib support body; S3. installing a thrust self-anchored system: after at least two adjacent wind load self-anchored systems and the arch rib support body are installed, a thrust self-anchored system is installed between the arch rib support body and the wind load self-anchored system adjacent to the arch rib support body, the thrust self-anchored system comprises a cable wind rope and a cable wind rope adjusting device, one end of the cable wind rope is detachably connected with one side of the upper part of the arch rib support body, and the other end is detachably connected with the enlarged foundation through the cable wind rope adjusting device. The application constructs the enlarged foundation, which is simultaneously used as the anchoring foundation of the arch rib support body and the cable wind rope, can resist the horizontal force generated during the installation of the arch rib segment, and simultaneously solves the problem that the narrow site cannot set up a transverse wind rope to resist wind load.

Description

TECHNICAL FIELD

[0001] The present application 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

[0002] The steel pipe concrete arch bridge is a bridge structure composed of steel pipes and concrete. In the construction process, the steel pipe can be used as a rigid load-bearing framework, the welding work is simple, the hoisting weight is light, thereby the construction process can be simplified, the construction period can be shortened, and the steel pipe has the functions of longitudinal main reinforcement and transverse hoop, can be used as a construction formwork, facilitates concrete pouring, further improves the convenience of construction, and ensures the stability of the bridge structure.

[0003] The steel pipe concrete arch bridge is constructed by the support method at the land, that is, a temporary arch rib support is built below the design position of the arch ring, the arch rib support is used as a construction platform to build the arch rib and the related superstructure. In the construction process of the arch rib, the arch rib is in a catenary line shape, and a certain horizontal force is generated on the arch rib support when the arch rib is installed in sections. To reduce the influence of the horizontal force on the alignment of the arch rib, a steel pipe or a section steel is usually installed between the arch rib supports along the longitudinal direction to connect the arch rib supports to form a whole. However, this method causes waste of materials, and if the installation section of the arch rib is too long, the stability of the arch rib support is prone to be lost due to the fact that the slenderness ratio between the supports does not meet the requirements. In addition, the arch rib support is generally a high and narrow structure, and the transverse wind load has a great influence. Therefore, a transverse cable is installed to resist the wind load. However, if the site on both sides of the arch bridge is narrow, the transverse cable cannot be installed to resist the wind load.

[0004] Therefore, when the arch bridge is built on a narrow site, how to construct the arch rib support to ensure the accuracy of the alignment of the arch rib installation has become one of the focuses of the construction of the steel pipe concrete arch bridge. SUMMARY

[0005] To solve the above problems in the background art, the present application provides a construction method of a self-anchored arch rib support suitable for narrow sites.

[0006] To achieve the above object, the technical scheme of the present application is as follows.

[0007] A construction method of a self-anchored arch rib support suitable for narrow sites, comprising the following steps:

[0008] S1. Constructing a wind load self-anchored system: the wind load self-anchored system comprises an anchoring structure and an enlarged foundation. The middle and lower parts of the anchoring structure are first driven into the ground foundation and are fixed with the ground foundation, then the enlarged foundation is poured, and the enlarged foundation is fixed with the upper part of the anchoring structure;

[0009] S2. Installing the arch rib support body: installing the construction arch rib support body on the enlarged foundation, and installing a support walking system on one side of the construction arch rib support body;

[0010] S3. Installing the thrust self-anchoring system: after at least two adjacent wind load self-anchoring systems and arch rib support bodies are installed, a thrust self-anchoring system is installed 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 comprising a cable wind rope and a cable wind rope adjusting device, one end of the cable wind rope being detachably connected to one side of the upper part of the arch rib support body, and the other end being detachably connected to the enlarged foundation through the cable wind rope adjusting device.

[0011] Preferably, in step S2, the construction arch rib support body comprises at least one arch rib support body segment, and the support walking system comprises at least one support walking segment, and after one arch rib support body segment is constructed, one support walking segment is installed on one side of the arch rib support body segment to align and fix the next arch rib support body segment with the already installed arch rib support body segment on the topmost support walking segment.

[0012] Preferably, the support walking system comprises a ladder support, an up-and-down ladder, and a rest platform, the ladder support being vertically arranged on one side of the arch rib support body, extending from the bottom end of the arch rib support body to the top end or a position close to the top end of the arch rib support body, and the ladder support being provided with the up-and-down ladder on one side or inside, and each support walking segment being provided with the rest platform, and the up-and-down ladder being disconnected in the area of the rest platform.

[0013] Preferably, the anchoring structure comprises a plurality of uplift anchor rods, the lower and middle parts of the uplift anchor rods being deeply embedded into the ground foundation, and the upper parts penetrating through the enlarged foundation and being consolidated together.

[0014] The construction steps comprise: drilling a hole in the ground foundation, vertically placing an uplift anchor rod in the hole and positioning it, grouting from bottom to top through a grouting pipe, pouring the enlarged foundation after reaching a certain strength, ensuring that the top end of the uplift anchor rod penetrates out of the enlarged foundation, pre-burying a reinforcing steel bar in the enlarged foundation near the top surface and close to the uplift anchor rod, placing an anchor plate from the top end of the uplift anchor rod after the enlarged foundation is consolidated, and finally screwing a nut against the top surface of the anchor plate and making the anchor plate against the top surface of the enlarged foundation.

[0015] Or: drill down to the ground foundation, reserve anchor rod passage in the template of the enlarged foundation, then pour the enlarged foundation, pre-bury the reinforcing steel bars in the enlarged foundation near the top surface and near the anchor rod passage, after the enlarged foundation is consolidated to a certain strength, pass the anti-pulling anchor rod through the anchor rod passage and deep into the hole of the ground foundation, inject grout from the lower to the upper through the grouting pipe, consolidate the anti-pulling anchor rod with the ground foundation and the enlarged foundation, then put the anchor plate from the top end of the anti-pulling anchor rod, finally screw the nut into the anchor plate top surface and make the anchor plate against the top surface of the enlarged foundation.

[0016] Preferably, it further comprises a step S4, which comprises installing an adjustable support system on the top of the arch rib support body, the adjustable support system comprising a support beam, a top support pad and a jack, the support beam is first installed horizontally on the top of the arch rib support body, then the top support pad and the jack are fixed on the top of the support beam, the top support pad comprises two top support pad units for matching the bottom of the corresponding support arch rib chord, and the jack is installed between the two top support pad units.

[0017] Preferably, each group of thrust self-anchoring system further comprises a support column ear plate and a foundation ear plate, the support column ear plate is fixed on one side of the upper part of the arch rib support body, the foundation ear plate is fixed on one side of the top surface of the enlarged foundation, then one end of the cable wind rope is connected with the support column ear plate and the other end is connected with the movable end of the cable wind rope adjusting device, the fixed end of the cable wind rope adjusting device is connected with the enlarged foundation through the foundation ear plate, and the length of the cable wind rope adjusting device is adjusted to keep the cable wind rope in tension.

[0018] Preferably, one end of the cable wind rope is connected with a shackle, and the shackle is detachably connected with the support column ear plate.

[0019] Preferably, one side of the arch rib support body which is not fixed on the top of the arch rib support and has no cable wind rope connected with the corresponding supported arch rib segment is provided with a thrust self-anchoring system.

[0020] Preferably, each arch rib support body comprises four support columns surrounding a cuboid, and each group of thrust self-anchoring system comprises two cable wind ropes, one end of each cable wind rope is connected with one of the two support columns at the front or rear of the arch rib support body, and the other end is connected on the intersection line of the extension line of the connecting line of the bottom ends of the two support columns on the same left or right side and the adjacent enlarged foundation, or on the outside of the intersection line of the extension line of the connecting line of the bottom ends of the two support columns on the same side and the adjacent enlarged foundation.

[0021] Preferably, the cable wind rope adjusting device is a hand-operated hoist.

[0022] The construction method of the self-anchored arch rib support suitable for narrow sites has the following advantages:

[0023] (1) The anchor point of the cable wind rope in the thrust self-anchored system is constructed on the expansion foundation of the adjacent thrust self-anchored system, effectively solving the problem that the narrow site cannot set up a transverse cable wind to resist wind load.

[0024] (2) The thrust self-anchored system is arranged between the arch rib support body and the wind load self-anchored system adjacent to the arch rib support body, which can resist the horizontal force generated during the installation of the arch rib segment, thereby avoiding the installation of longitudinal connection between the arch rib supports and avoiding material waste.

[0025] (3) The support walking system is arranged to solve the problems of arch rib support segment assembly and arch rib installation up and down channel.

[0026] (4) The adjustable support system is further arranged at the top of the arch rib support, which can conveniently and quickly adjust the elevation when the arch rib segments are aligned. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0028] Figure 2 is a top view structural schematic diagram of Figure 1 .

[0029] Figure 3 is a structural schematic diagram of an embodiment of the wind load self-anchored system.

[0030] Figure 4 is a right view structural schematic diagram of Figure 3 .

[0031] Figure 5 is a top view structural schematic diagram of Figure 4 .

[0032] Figure 6 is an enlarged structural schematic diagram of the uplift anchor rod.

[0033] Figure 7 is a structural schematic diagram of an embodiment of the thrust self-anchored system.

[0034] Figure 8 is a structural schematic diagram of the adjustable support system.

[0035] Figure 9 is a right view structural schematic diagram of Figure 8 .

[0036] Figure 10 is a top view structural schematic diagram of Figure 8 .

[0037] Figure 11 is a structural schematic diagram of an embodiment of the rest platform.

[0038] Figure 12 is a right view structural schematic diagram of Figure 11 .

[0039] Figure 13 is a top view structural schematic diagram of Figure 11 .

[0040] In the figure, wind load self-anchoring system 100, enlarged foundation 110, reinforcing steel bars 111, anti-pulling anchor rod 120, anti-pulling anchor rod body 121, nut 122, anchor plate 123, grouting pipe 124, arch rib support body 200, support column 210, thrust self-anchoring system 300, support column ear plate 310, shackle 320, cable wind rope 330, hand-operated hoist 340, foundation ear plate 350, adjustable support system 400, jack 410, support cross beam 420, top support cushion 430, support walking system 500, rest platform 510, up-and-down ladder 520, ladder support 530. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] A construction method of a self-anchored arch rib support suitable for narrow sites, comprising the following steps:

[0045] S1. Construction wind load self-anchoring system 100: The construction wind load self-anchoring system 100 comprises an anchoring structure and an enlarged foundation 110. The middle and lower parts of the anchoring structure are first driven into the ground foundation and are consolidated with the ground foundation, and then the enlarged foundation 110 is poured, which is consolidated with the upper part of the anchoring structure;

[0046] S2. Installation of arch rib support body 200: The construction arch rib support body 200 is installed on the enlarged foundation 110, and the support walking system 500 is installed on one side of the construction arch rib support body 200;

[0047] S3. Installation of thrust self-anchoring system: After at least two adjacent wind load self-anchoring systems 100 and arch rib support bodies 200 are installed, the thrust self-anchoring system 300 is installed 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 comprises 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.

[0048] In the arch rib construction, the construction wind load self-anchoring system 100 and the installation of the arch rib support body 200 must be matched with multiple installations. The installation of multiple construction wind load self-anchoring systems 100 and arch rib support bodies 200 can be performed simultaneously or sequentially according to the situation. For the thrust self-anchoring system, it can be installed after the corresponding wind load self-anchoring system 100 and the installation of the arch rib support body 200 are completed, or it can be installed simultaneously or sequentially after all wind load self-anchoring systems 100 and arch rib support bodies 200 are constructed.

[0049] The cable wind rope adjusting device is arranged between the enlarged foundation 110 and the cable wind rope 330. The cable wind rope adjusting device can adjust the overall length of the cable wind rope 330 and the cable wind rope adjusting device, and tension the cable wind rope 330, so as to better resist the wind load and the horizontal force of the installation of the arch rib segment.

[0050] In this embodiment, the enlarged foundation 110 simultaneously serves as the anchoring foundation of the arch rib support body 200 and the cable wind rope 330, which eliminates the need to install a horizontal cable wind anchoring foundation, thereby effectively solving the problem of narrow site that cannot set up a horizontal cable wind anchoring foundation to resist wind load, and effectively shortening the construction period. By arranging 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 purpose of resisting the horizontal force generated during the installation of the arch rib segment can be achieved, thereby avoiding the installation of longitudinal connection between the arch rib supports and avoiding material waste.

[0051] Preferably, in step S2, the arch rib support body 200 comprises at least one arch rib support body segment, the support walking system 500 comprises at least one support walking segment, and after the construction of each arch rib support body segment, one support walking segment is installed on one side of the arch rib support body segment, so that the next arch rib support body segment is aligned and fixed between the topmost support walking segment and the installed arch rib support body segment. In addition, the arch rib support body segments are generally connected by flanges and bolts, which makes the construction more convenient, and after walking to the topmost support walking segment, a construction platform can be additionally installed to complete the connection between the arch rib support body segments. The embodiment solves the problems of arch rib support segment assembly and arch rib installation up and down channel by providing the support walking system 500.

[0052] Preferably, the embodiment provides a specific support walking system 500, which comprises a ladder support 530, an up-and-down ladder 520, and a rest platform 510, which are combined Figures 11-13 Figures 11-13 The main schematic is the rest platform 510, and the ladder support 530 and the up-and-down ladder 520 above and below the rest platform 510 are not shown. The ladder support 530 is vertically arranged on one side of the arch rib support body 200, and is combined Figure 13 As shown, the embodiment schematically shows that the ladder support 530 extends from the bottom end of the arch rib support body 200 to the top end or a position close to the top end of the arch rib support body 200 on one inner side of the arch rib support body 200, and can be made of steel pipe columns. The steel pipe columns can be welded with transverse connections to be connected as a whole. The ladder support 530 is provided with the up-and-down ladder 520 on one side or inside. The up-and-down ladder 520 can be vertically upward in a straight line or alternately upward in a left-right bending manner. The up-and-down ladder 520 is preferably matched with a back cage to ensure the safety of the construction personnel in upward and downward construction. Each support walking segment is provided with the rest platform 510, and the up-and-down ladder 520 is disconnected in the area of the rest platform 510. The rest platform 510 is generally erected on the transverse connection of two opposite sides of the arch rib support body and maintains a certain distance from the construction platform.

[0053] Preferably, the embodiment provides a specific anchoring structure, which is combined Figures 3-5 ​As shown, the wind load self-anchoring system 100 of the embodiment is installed at a land site. The anchoring structure includes a plurality of uplift anchor rods 120. The lower and middle parts of the uplift anchor rods 120 are embedded into the ground foundation, and the upper parts of the uplift anchor rods 120 pass through the enlarged foundation 110 and are fixed together. The enlarged foundation 110 of the embodiment is a reinforced concrete foundation. The construction steps include: the uplift anchor rod 120 includes an uplift anchor rod body 121. A hole is drilled downward in the ground foundation. The uplift anchor rod body 121 is vertically placed in the hole and positioned. Grouting is performed from bottom to top through the grouting pipe 124. After a certain strength is reached, the enlarged foundation 110 is poured. The top end of the uplift anchor rod body 121 is ensured to pass out of the enlarged foundation 110. The reinforcing steel bars 111 are pre-buried in the enlarged foundation 110 near the top surface thereof and close to the uplift anchor rod body 121 to increase the compression resistance of the enlarged foundation 110. After the enlarged foundation 110 is fixed, the anchor plate 123 with a through hole is placed from the top end of the uplift anchor rod body 121. Finally, the nut 122 is screwed against the top surface of the anchor plate 123 and the anchor plate 123 is against the top surface of the enlarged foundation 110. In addition, the construction steps can also be: a hole is drilled downward in the ground foundation. The anchor rod passage is reserved in the formwork of the enlarged foundation 110 (the anchor rod passage can be reserved by inserting a PVC pipe in the formwork). Then, the enlarged foundation 110 is poured. The reinforcing steel bars 111 are pre-buried in the enlarged foundation near the top surface thereof and close to the anchor rod passage. After the enlarged foundation 110 is fixed and reaches a certain strength, the uplift anchor rod body 121 is passed through the anchor rod passage and embedded into the hole of the ground foundation. Grouting is performed from bottom to top through the grouting pipe 124. The grout overflows from the top of the enlarged foundation 110. The grout is fixed to fix the uplift anchor rod 120, the ground foundation and the enlarged foundation 110 together. Then, the anchor plate 123 is placed from the top end of the uplift anchor rod body 121. Finally, the nut 122 is screwed against the top surface of the anchor plate 123 and the anchor plate 123 is against the top surface of the enlarged foundation 110. In addition, according to actual conditions, various pile structures, such as a cast-in-situ pile, can be used for the anchoring structure.

[0054] Preferably, step S4 is further included, which comprises: installing the adjustable support system 400 on the top of the arch rib support body 200, combining Figures 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 in the transverse 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 for matching the bottom sides of the corresponding support arch rib chord, and the jack 410 is installed between the two top support pad units. By adjusting the length of the jack 410, the elevation adjustment can be quickly performed when the arch rib segments are aligned. The number of the top support pad 430 is matched with the number of the arch rib chord above the arch rib support body 200. In this embodiment, the bottom chord of the arch rib segment has 4 chords (2 chords on the left and 2 chords on the right), and the top support pad 430 has 2 top support pad units. The fixing mode of the support beam 420 is determined according to the structure of the arch rib support body 200. The arch rib support body 200 generally includes 4 support columns 210, and the support beam 420 is provided with two support beams, which are respectively fixed on the upper surfaces of 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 composed of three spliced I-beams, and the jack 410 is a screw jack.

[0055] Preferably, in combination Figure 6 As shown, each group of the thrust self-anchoring system 300 further includes a support column ear plate 310 and a foundation ear plate 350. The support column ear plate 310 is fixed on one side of the upper part of the arch rib support body 200, and the foundation ear plate 350 is fixed on one side of the top surface of the enlarged foundation 110. Then one end of the cable wind rope 330 is connected with the support column ear plate 310, and the other end is connected with the movable end of the cable wind rope adjusting device. The fixed end of the cable wind rope adjusting device is connected with the enlarged foundation 110 through the foundation ear plate 350, and the length of the cable wind rope adjusting device is adjusted to keep the cable wind rope 330 in tension. In this embodiment, the ear plate structure is used for connection. The ear plate is provided with corresponding ear holes, which can conveniently bind the cable wind rope 330 and connect with the corresponding cable wind rope adjusting device through a pin shaft or a hook body structure, which is convenient to operate and can better improve the construction efficiency.

[0056] Preferably, one end of the cable wind rope 330 is connected with a shackle 320, which is detachably connected with the support column ear plate 310. Before installing the cable wind rope 330, the shackle 320 is connected with one end of the cable wind rope 330 in advance. Then when the thrust self-anchoring system 300 is installed, the shackle 320 is directly hung on the support column ear plate 310 to quickly realize the connection between the cable wind rope 330 and the arch rib support body 200.

[0057] Preferably, in order to reduce construction cost while ensuring construction safety and accuracy, the number of thrust self-anchoring systems 300 is determined in consideration of the following: the side of the arch rib support body 200 not fixed on the arch rib abutment and not connected to the cable wind rope 330 of the corresponding arch rib segment is provided with a thrust self-anchoring system 300. Figure 1 The above arrangement is described as follows, Figure 1 The arch rib support shown in the above figure is used to install the arch rib segment on one side. The arch rib segment on the opposite side can be installed by using the support method, or the swivel 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 abutment (the rightmost enlarged foundation 110 is shown in the figure). Since the arch abutment is relatively stable, the arch rib support body 200 installed on the arch rib abutment is not connected to the cable wind rope 330 on the top side. The front enlarged foundation 110 (the leftmost enlarged foundation 110 is shown in the figure) supports the arch rib segment on the top side, which is the arch rib segment on the other side. The arch rib segment on the other side is tensioned by the cable wind rope, so that the arch rib support body 200 is not connected to the cable wind rope 330 on the top side.

[0058] Preferably, each arch rib support body 200 includes four support columns 210 surrounding a cubic shape. Of course, the four support columns 210 are also connected by horizontal connection. This is the structure of the existing arch rib support body 200, which will not be described in detail here. Each set of thrust self-anchoring systems 300 includes two cable wind ropes 330. One end of each cable wind rope 330 is connected to the two front / rear support columns 210 of the arch rib support body 200 (the left side is the front and the right side is the rear, as shown in the above figure). Figure 2 The other end of each cable wind rope 330 is connected to the intersection of the extension line of the connecting line at the bottom end of the two support columns 210 on the same left or right side and the adjacent enlarged foundation 110 (as shown in the above figure). That is, the spacing between the two cable wind ropes 330 is equal to the spacing between the two support columns 210, and is arranged along the longitudinal direction of the arch rib. In this way, the horizontal force generated during the installation of the arch rib segment can be better resisted, or the intersection of the extension line of the connecting line at the bottom end of the two support columns 210 on the same left or right side and the adjacent enlarged foundation 110 is outside, that is, both cable wind ropes 330 are inclined outward, and the spacing between the two cable wind ropes 330 is greater than the spacing between the two support columns 210. Figure 2

[0059] Preferably, the embodiment also provides a cable wind rope adjusting device, which is a hand-operated hoist 340. The length of the chain or steel wire rope of the hand-operated hoist 340 can be adjusted, thereby adjusting the overall length of the cable wind rope 330 and the cable wind rope adjusting device.​

Claims

1. A method for constructing a self-anchored arch-rib braced frame suitable for narrow sites, characterized in that The method comprises the following steps: S1. Construction wind load self-anchoring system: the wind load self-anchoring system comprises an anchoring structure and an enlarged foundation, the middle and lower parts of the anchoring structure are first driven into the ground foundation and are consolidated with the ground foundation, then the enlarged foundation is poured, and the enlarged foundation is consolidated with the upper part of the anchoring structure; S2. Installation of arch rib support body: the arch rib support body is installed above the enlarged foundation, and a support walking system is installed on one side of the arch rib support body; S3. Installation of thrust self-anchoring system: after at least two adjacent wind load self-anchoring systems and arch rib support bodies are installed, a thrust self-anchoring system is installed 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 cable wind rope and a cable wind rope adjusting device, one end of the cable wind rope is detachably connected with one side of the upper part of the arch rib support body, and the other end is detachably connected with the enlarged foundation through the cable wind rope adjusting device; Each group of thrust self-anchoring systems further comprises a support column ear plate and a foundation ear plate, the support column ear plate is fixed on one side of the upper part of the arch rib support body, the foundation ear plate is fixed on one side of the top surface of the enlarged foundation, then one end of the cable wind rope is connected with the support column ear plate, and the other end is connected with the movable end of the cable wind rope adjusting device, the fixed end of the cable wind rope adjusting device is connected with the enlarged foundation through the foundation ear plate, the length of the cable wind rope adjusting device is adjusted, and the cable wind rope is kept in a tensioned state; The cable wind rope adjusting device is a hand-operated hoist.

2. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1, wherein: In step S2, the arch rib support body comprises at least one arch rib support body segment, and the support walking system comprises at least one support walking segment, after one arch rib support body segment is constructed, one support walking segment is installed on one side of the arch rib support body segment, and the topmost support walking segment is used for the alignment and fixation between the next arch rib support body segment and the already installed arch rib support body segment.

3. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 2, wherein: The support walking system comprises a ladder support, an up-and-down ladder, and a rest platform, the ladder support is vertically arranged on one side of the arch rib support body, extends from the bottom end of the arch rib support body to the top end or a position close to the top end of the arch rib support body, and is provided with the up-and-down ladder on one side or inside, each support walking segment is provided with the rest platform, and the up-and-down ladder is 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, wherein: The anchoring structure comprises a plurality of uplift anchor rods, the lower and middle parts of the uplift anchor rods are deeply inserted into the ground foundation, and the upper parts pass through the enlarged foundation and are consolidated together. The construction steps include: drilling a hole downward in the ground foundation, vertically placing and positioning the uplift anchor rod in the hole, grouting upward through the grouting pipe, pouring the enlarged foundation after reaching a certain strength, ensuring that the top end of the uplift anchor rod penetrates through the enlarged foundation, and pre-burying the reinforcing steel bars near the top surface of the enlarged foundation and close to the uplift anchor rod, placing the anchor plate from the top end of the uplift anchor rod after the consolidation of the enlarged foundation, and finally screwing the nut against the top surface of the anchor plate and making the anchor plate against the top surface of the enlarged foundation; Or: drilling a hole downward in the ground foundation, reserving the anchor rod passage in the formwork of the enlarged foundation, pouring the enlarged foundation, pre-burying the reinforcing steel bars near the top surface of the enlarged foundation and close to the anchor rod passage, penetrating the uplift anchor rod through the anchor rod passage and deep into the hole of the ground foundation after the consolidation of the enlarged foundation reaches a certain strength, grouting upward through the grouting pipe, consolidating the uplift anchor rod with the ground foundation and the enlarged foundation, then placing the anchor plate from the top end of the uplift anchor rod, and finally screwing the nut against the top surface of the anchor plate and making the anchor plate against the top surface of the enlarged foundation.

5. The construction method of the self-anchored arch rib support suitable for narrow sites according to claim 1, characterized in that: It further comprises a step S4, which comprises installing an adjustable support system on the top of the arch rib support body, the adjustable support system comprising a support beam, a top support pad and a jack, the support beam is first installed horizontally on the top of the arch rib support body, and then the top support pad and the jack are fixed on the top surface of the support beam, the top support pad comprises two top support pad units for matching the bottom of the corresponding support 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: One end of the cable wind rope is connected with a shackle, and the shackle is detachably connected with the support column ear plate.

7. The construction method of the self-anchored arch rib support suitable for narrow sites according to any one of claims 1-6, characterized in that: The side of the arch rib support body which is not fixed on the top of the arch rib abutment and does not have a cable wind rope connected to the corresponding supported arch rib segment is provided with a thrust self-anchoring system.

8. The construction method of the self-anchored arch rib support suitable for narrow sites according to any one of claims 1-6, characterized in that: Each arch rib support body comprises four support columns surrounding a cuboid, and each group of thrust self-anchoring systems comprises two cable wind ropes, one end of each cable wind rope is connected with one of the two support columns at the front or rear of the arch rib support body, and the other end is connected with the intersection line of the extension line of the connecting line of the bottom ends of the two support columns on the same left or right side and the adjacent enlarged foundation, or is connected outside the intersection line of the extension line of the connecting line of the bottom ends of the two support columns on the same side and the adjacent enlarged foundation.

Images