Large-span basket type arch frame upside-down construction method

Abstract

The invention discloses a large-span basket type arch frame upside-down construction method, and belongs to the technical field of building construction. The method comprises the following steps: positioning the position of an arch frame, establishing a space coordinate, integrally dividing the arch frame into five sections, erecting a support frame of a middle arch section, welding a jig frame of the middle arch section, welding the middle arch section, installing the other four sections to be connected with the middle arch section, installing a support, constructing a pull rod, and unloading. The inverted construction method is adopted, the arch frame is divided into five sections to be installed, accurate positioning can be achieved, and the installation accuracy is improved. According to the method, errors generated by high-altitude assembly are reduced, the installation quality is guaranteed, the construction progress is accelerated, and safety accidents are prevented. The method provides reference for future similar engineering, and has important theoretical significance and engineering application value. And meanwhile, by means of the method, the construction technology level of enterprises for the lifting basket arches can be improved, the competitiveness of the enterprises for contracting similar projects is enhanced, and greater later benefits are brought to the enterprises.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to the installation of a bridge arch frame, and specifically is an inverted installation construction method of a large-span basket-type arch frame. Background Art

[0002] With the rapid development of urban construction in my country, more and more river management projects are being carried out across the country, and the construction of various beautifully shaped arch bridges has increased accordingly, and they have even become popular check-in spots for internet celebrities in various places.

[0003] For arch bridges, the bridge deck generally adopts basket-type box-type steel arch, also known as basket-type arch frame. When constructing basket-type arch frames, the conventional method is to assemble them on the ground first, then hoist them in sections, and finally close them in the air. However, due to the complex spatial position of the basket-type arch frame, the installation accuracy is still high, and the inclination angle of the inclined arch beam is difficult to locate, so the installation is extremely difficult, and the required crane model is large, and there are also great safety hazards. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of complex spatial position, difficult positioning, great difficulty in installation, and potential safety hazards in the conventional basket-type arch frame installation method, and to provide a large-span basket-type arch frame inverted installation construction method.

[0005] The present invention is achieved through the following technical solutions: A method for inverted construction of a large-span basket-type arch frame, wherein the arch frame comprises a main arch and a secondary arch that are symmetrically arranged, and the construction method comprises the following steps: S1. Use the BIM model to locate each position of the arch and establish the spatial coordinates.

[0006] S2. Divide the entire arch frame into five sections, namely: the middle arch section, the left section of the main arch, the right section of the main arch, the right section of the auxiliary arch, and the left section of the auxiliary arch; among which, the middle arch section is composed of the middle section of the main arch and the middle section of the auxiliary arch.

[0007] S3. Set up a support frame for the middle arch section. The support frame includes six groups of lattice columns. The six groups of lattice columns are respectively positioned on both sides of the middle and four corners of the middle arch section. The bottom of the lattice columns is fixed to the ground with anchor bolts.

[0008] S4. According to the spatial position of the middle section of the main arch and the middle section of the auxiliary arch in the middle arch section, weld the frame of the middle arch section, find out the arch line shape, and set up operating platforms around it.

[0009] S5. Find out the arch line shape according to the tire frame and weld the middle arch section.

[0010] S6. Install the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section respectively, so that the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section are all connected to the middle arch section; then install the supports respectively, so that the supports are connected to the bottom ends of the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section respectively.

[0011] S7. After installing the arch frame, carry out the construction of the pull rod and finally unload it.

[0012] Further, in step S3, six groups of lattice columns are respectively positioned at the middle position of the main arch middle section, the left end position of the main arch middle section, the right end position of the main arch middle section, the middle position of the secondary arch middle section, the left end position of the secondary arch middle section, and the right end position of the secondary arch middle section.

[0013] Furthermore, in step S3, the four faces of the six groups of lattice columns are connected into a whole by a frame to form a stable structural system.

[0014] Furthermore, in step S4, a set of tire frames are welded to the tops of the six sets of lattice columns, and the middle arch sections are supported on the six sets of tire frames.

[0015] Furthermore, in step S6, when the main arch left section, the main arch right section, the auxiliary arch right section, the auxiliary arch left section and the middle arch section are installed and connected, a symmetrical installation method is adopted to ensure balance.

[0016] The present invention adopts the inverted installation method for construction, and divides the arch frame into five sections for installation, which can accurately locate and improve the installation accuracy. Compared with the traditional overall lifting method, the method of the present invention reduces the error caused by high-altitude assembly, not only ensures the installation quality, speeds up the construction progress, but also prevents the occurrence of safety accidents. The method of the present invention provides a reference for similar projects in the future, and has important theoretical significance and engineering application value. At the same time, the method of the present invention can also improve the construction technology level of enterprises for such basket handle arches, enhance the competitiveness of enterprises in undertaking similar projects, and bring greater later benefits to enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is a schematic plan view of the large-span basket-carrying arch frame described in the present invention.

[0019] Figure 2 It is a schematic elevation view of the lattice column and the frame described in the present invention.

[0020] In the figure: 1-middle arch section, 2-left section of main arch, 3-right section of main arch, 4-right section of auxiliary arch, 5-left section of auxiliary arch, 6-lattice column, 7-anchor bolt, 8-frame, 9-tire frame; 1-1-middle section of main arch, 1-2-middle section of auxiliary arch. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments 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.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "left", "right", "middle", "bottom" and "top" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] This embodiment involves the construction of an arch bridge, which has one main arch and one auxiliary arch on the south and north sides of the bridge, and the bridge deck is a basket-type box-shaped steel arch, that is, a large-span basket-type arch frame, with a span of 54-60m, a height of 15-17.251m, a cross-section of 1m*0.7m-1m*1m, and a rise-span ratio of 1:3.48-1:3.6. The large-span basket-type arch frame has a large span, a difficult box-shaped arch to manufacture, a difficult positioning of the inclined arch beam inclination angle, and a difficult installation.

[0025] In view of the problems existing in the above construction process, this embodiment provides a large-span basket-type arch frame inverted construction method, such as Figure 1 and Figure 2 As shown, the following steps are included: S1. Use the BIM model to locate each position of the arch and establish the spatial coordinates.

[0026] S2. Divide the entire arch frame into five sections, namely: middle arch section 1, main arch left section 2, main arch right section 3, auxiliary arch right section 4, auxiliary arch left section 5; wherein, the middle arch section 1 is composed of the main arch middle section 1-1 and the auxiliary arch middle section.

[0027] S3. Set up a support frame for the middle arch section 1, the support frame includes six groups of lattice columns 6, and the six groups of lattice columns 6 are respectively positioned on both sides of the middle and four corners of the middle arch section 1, that is: the six groups of lattice columns 6 are respectively positioned at the middle position of the main arch middle section 1-1, the left end position of the main arch middle section 1-1, the right end position of the main arch middle section 1-1, the middle position of the auxiliary arch middle section 1-2, the left end position of the auxiliary arch middle section 1-2, and the right end position of the auxiliary arch middle section 1-2; the bottom of each group of lattice columns 6 is fixed to the ground by anchor bolts 7; the four faces of the six groups of lattice columns 6 are connected into a whole by a frame body 8 to form a stable structural system.

[0028] S4. According to the spatial positions of the main arch middle section 1-1 and the secondary arch middle section 1-2 in the middle arch section 1, the tire frame 9 of the middle arch section 1 is welded. A set of tire frames 9 are welded on the tops of the six groups of lattice columns 6. The middle arch section 1 is supported on the six groups of tire frames 9. The arch line shape is found and an operating platform is set up around it.

[0029] S5. Find out the arch line type according to the tire frame 9 and weld the middle arch section 1.

[0030] S6. Install the main arch left section 2, the main arch right section 3, the secondary arch right section 4, and the secondary arch left section 5 respectively, so that the main arch left section 2, the main arch right section 3, the secondary arch right section 4, and the secondary arch left section 5 are all connected to the middle arch section 1. When installing and connecting, adopt a symmetrical installation method to ensure balance; then install the supports respectively, so that the bottom ends of the main arch left section 2, the main arch right section 3, the secondary arch right section 4, and the secondary arch left section 5 are respectively installed with connecting supports.

[0031] S7. After installing the arch frame, carry out the construction of the pull rod and finally unload it.

[0032] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The phrase "includes an element defined by ..." does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for inverted construction of a large-span basket-type arch frame, wherein the arch frame comprises a main arch and a secondary arch that are symmetrically arranged. It is characterized in that The construction method includes the following steps: S1. Use the BIM model to locate each position of the arch and establish spatial coordinates; S2. Divide the entire arch frame into five sections, namely: a middle arch section, a left section of a main arch, a right section of a main arch, a right section of a secondary arch, and a left section of a secondary arch; wherein the middle arch section is composed of a middle section of the main arch and a middle section of the secondary arch; S3, erecting a support frame for the middle arch section, the support frame includes six groups of lattice columns, the six groups of lattice columns are respectively positioned on both sides of the middle of the middle arch section and at four corners, and the bottom of the lattice columns is fixed to the ground with anchor bolts; S4. According to the spatial positions of the middle section of the main arch and the middle section of the auxiliary arch in the middle arch section, weld the tire frame of the middle arch section, find out the arch line shape, and set up an operating platform around it; S5. Find the arch line type according to the tire frame and weld the middle arch section; S6, respectively install the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section, so that the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section are all connected to the middle arch section; then respectively install the supports, so that the supports are respectively connected to the bottom ends of the main arch left section, the main arch right section, the auxiliary arch right section, and the auxiliary arch left section; S7. After installing the arch frame, carry out the construction of the pull rod and finally unload it.

2. A large-span basket-type arch inverted construction method according to claim 1, Features: In step S3, six groups of lattice columns are respectively positioned at the middle position of the main arch middle section, the left end position of the main arch middle section, the right end position of the main arch middle section, the middle position of the secondary arch middle section, the left end position of the secondary arch middle section, and the right end position of the secondary arch middle section.

3. A large-span basket-type arch inverted construction method according to claim 1 or 2, Features: In step S3, the four faces of the six groups of lattice columns are connected into a whole by a frame to form a stable structural system.

4. A large-span basket-type arch inverted construction method according to claim 1, Features: In step S4, a set of tire frames are welded to the tops of the six sets of lattice columns, and the middle arch sections are supported on the six sets of tire frames.

5. A large-span basket-type arch inverted construction method according to claim 1, Features: In step S6, when the main arch left section, the main arch right section, the auxiliary arch right section, the auxiliary arch left section and the middle arch section are installed and connected, a symmetrical installation method is adopted to ensure balance.

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