A method of connecting a timber beam to a timber arch

Abstract

This invention discloses a Bailey bridge arch connection and its usage method, relating to the field of highway and urban road bridge construction technology. The Bailey bridge arch connection includes a Bailey bridge arch, which is composed of a single-end double-pin-hole lug plate fully threaded screw, a bidirectional threaded connecting sleeve, a long single-end single-pin-hole lug plate fully threaded screw, a short single-end single-pin-hole lug plate fully threaded screw, and a pin bolt. The core components of the Bailey bridge arch connection are the single-end double-pin-hole lug plate fully threaded screw and the bidirectional threaded connecting sleeve. This Bailey bridge arch connection and its usage method, through the double-pin hole structure of the single-end double-pin-hole lug plate fully threaded screw, can form a stable triangular truss structure with the connecting members. Simultaneously, through the bidirectional threaded connecting sleeve equipped with limiting holes and adjusting holes, the length of the connecting members can be quickly adjusted and locked, and the entire adjustment process basically does not interrupt or change the stress state and load-bearing capacity of the members.

Description

Technical Field

[0001] This invention relates to the field of highway and urban road bridge construction technology, specifically to a Bailey beam arch frame connection and its usage method. Background Technology

[0002] For small- to medium-span cast-in-place reinforced concrete / prestressed concrete structures with an arched, parabolic, or catenary curve at the bottom of the superstructure, scaffolding or arch construction is often used. Arch construction does not have the problem of mid-span foundation landing that scaffolding construction has, making it more suitable for complex and variable on-site construction conditions.

[0003] The main types of truss arch frames used in construction include Bailey beam-panel assembled arch frames, 64 military beam-panel assembled arch frames, adjustable steel arch frames, and adjustable triangular truss-panel arch frames.

[0004] In Bailey bridge arch systems, to adapt to varying curved profiles, directly connecting the upper and lower chords of two rectangular truss Bailey beam segments using only hinged joints would result in geometrically variable connections. Therefore, custom-made trapezoidal connectors with stable geometric dimensions are necessary for adjustment. In practice, T-shaped connectors that increase the spacing between the upper chords are more commonly used. A drawback of traditional Bailey bridge arch systems is the need to prefabricate a large number of connectors of varying sizes for different curved profiles. Furthermore, deviations during actual assembly can lead to difficulties in closing the beams, necessitating on-site fabrication of closure connectors.

[0005] The 64 Military-Grade Arch Frame mainly consists of a standard triangular truss, end frames, standard chords, end chords, diagonal chords, struts, and horizontal connecting beams. It adapts to changes in the curve by adjusting the custom-length lower chord. However, similar to traditional Bailey arch frames, the length of the lower chord needs to be customized according to different curves, and actual assembly deviations can lead to difficulties in closing the frame, requiring on-site fabrication of closure connectors. Furthermore, besides the fact that this type of arch frame based on triangular trusses is relatively high and cannot adapt to the limited space under the bridge, the calculated length of the lower chord is also larger than that of a Bailey arch frame, resulting in a significant reduction in compressive stability.

[0006] Adjustable steel arch frames are an improvement on traditional Bailey bridge arch frames. They adapt to changes in the curve shape by using threaded adjustable male and female joints at both ends of the upper chord of the Bailey beam. However, on the one hand, the threaded adjustment range is relatively short, limiting the range of curve adjustments that can be adapted to. On the other hand, the curved male and female joints can only bear compression. When the upper chord is under tension due to local construction loads, stability and safety issues will arise.

[0007] Other adjustable triangular truss arches mainly fall into two categories. One type uses custom-made hinged lower chords of several lengths, combining different lengths to control the deviation between the arch and the design curve to be within a certain controllable range. The other type uses slots, clips, or shims to adjust the length of the lower chord. Besides still having a limited adjustable range, both types of arches, similar to the 64 military beam arches, have a relatively high height due to their triangular truss structure, making them unsuitable for the confined space under bridges. Furthermore, the calculated length of the lower chord is larger than that of Bailey arches, resulting in a significant reduction in compressive stability.

[0008] In addition to the aforementioned problems, the various existing truss-type arch frames also have several other major issues: First, unless the spliced ​​arch frame is adjusted by using cable-stayed adjustment and customizing and adjusting the members again, it is impossible to adjust the construction deviations and elevations of the spliced ​​sections. Cable-stayed adjustment will inevitably bring about statically indeterminate constraints, making it difficult to guarantee the construction period. Second, traditional Bailey beam arch frames and 64 military beam arch frames must be customized for each bridge. Different alignments require different members, and members of different lengths are difficult to reuse. Other arch frames, such as micro-adjustable arch frames, either have low assembly accuracy or extremely limited adjustment range, making it difficult to meet the needs of most construction and usage conditions. In addition, the existing truss-type arch frame connection structures are often only suitable for certain standardized truss products. When the dimensions of the standard truss pieces change, even with a small dimensional deviation, the connectors may need to be adjusted or customized extensively. Summary of the Invention

[0009] (a) Technical problems to be solved

[0010] To address the shortcomings of existing technologies, this invention provides a Bailey beam arch connection and its usage method, solving the problems of poor versatility, limited adaptability to certain customized truss products, limited curve adaptability, inability to facilitate easy adjustment of the arch alignment during construction, and easy confusion and difficulty in closure of various customized members / connectors.

[0011] (II) Technical Solution

[0012] To achieve the above objectives, the present invention provides the following technical solution: a Bailey bridge arch connection, comprising a Bailey bridge arch, wherein the Bailey bridge arch connection is composed of a single-end double-pin-hole ear plate fully threaded screw, a bidirectional threaded connecting sleeve, a long single-end single-pin-hole ear plate fully threaded screw, a short single-end single-pin-hole ear plate fully threaded screw, and a pin bolt. The core components of the Bailey bridge arch connection are the single-end double-pin-hole ear plate fully threaded screw and the bidirectional threaded connecting sleeve. The single-end double-pin-hole ear plate fully threaded screw has two sets of pin-hole ear plates fixed at one end, which can simultaneously perform two sets of different bolted connections.

[0013] The pinhole lugs are matched with male and female pinhole lugs according to the chord joints of the standard Bailey bridge / truss beam segments being spliced.

[0014] A Bailey beam arch frame connection and its usage method, comprising the Bailey beam arch frame connection described above, with specific operations as follows:

[0015] S1. Construct arch seats or piers, and install the arch frame and arch hinges that are compatible with this invention, with the arch hinges temporarily fixed.

[0016] S2. According to the plan and calculation, the standard truss components and the connectors of the present invention are quickly initially positioned and connected to form the hoisting segment length;

[0017] S3. Hoist each segment of the arch frame or the unit segments assembled laterally onto temporary supports or brackets (or apply cable ties), and install the corresponding arch frame segments with horizontal bracing.

[0018] S4. Adjust the arch frame elevation on the support (or with the aid of the buckle), and use the bidirectional threaded connecting sleeve to adjust the connecting rod parameters so that each section of the arch frame meets the calculated pre-camber, and then fix it with the connector of the present invention;

[0019] S5. After releasing the temporary consolidation of the arch hinge, the temporary support or bracket is slowly supported (or the ties are loosened). The theoretical deviation of the arch frame line elevation is measured and recorded. With or without the use of a second support / bracket / ties, the arch frame curve is finely adjusted to the theoretical design value through the bidirectional threaded sleeve.

[0020] S6. After the ballast test, based on the ballast deformation, the bidirectional threaded connection sleeve can be used to correct it again to meet the design and construction requirements.

[0021] S7. Erect formwork and support beams for the upper structure pouring on the arch frame to complete the upper pouring construction;

[0022] S8. Use temporary supports / braces / cables to complete the segmentation of the arch frame and the removal of the arch hinges, and complete the remaining bridge construction.

[0023] Preferably, the bidirectional threaded connecting sleeve limiting hole and length adjustment hole may be replaced by other limiting devices, and the screw thread may not be continuous due to processing and other factors.

[0024] Preferably, the bidirectional threaded connecting sleeve is a sleeve with internal threads arranged clockwise and counterclockwise at both ends, and the bidirectional threaded connecting sleeve can change the relative distance between the connecting screws at both ends by rotating itself clockwise or counterclockwise.

[0025] Preferably, the bidirectional threaded sleeve may also have multiple length adjustment locking holes / screw holes in the middle.

[0026] The preferred bidirectional threaded connection sleeve may have screw fastening limit holes at both ends that constrain the rotation of the screw and penetrate the sleeve wall thickness.

[0027] (III) Beneficial Effects

[0028] This invention provides a Bailey beam arch frame connection and its usage method. It has the following beneficial effects:

[0029] This Bailey beam arch connection and its usage method utilizes a double-pin hole structure with a single-end double-pin hole lug plate and a fully threaded screw to form a stable triangular truss structure with connecting members. Simultaneously, a bidirectional threaded connecting sleeve with limiting holes and adjusting slots allows for quick adjustment and locking of the connecting member's length, without interrupting or altering the member's stress state or load-bearing capacity during the adjustment process. Clearly, due to its versatility and adjustability, this invention is applicable not only to standard 321 Bailey beams but also to reinforced Bailey beams, 200-type Bailey beams, or similar prefabricated assembled truss beams. Therefore, the Bailey beam arch connection proposed in this invention offers a wide adjustment range, enabling the arch to quickly adapt to various engineering curves and alignments during erection and dismantling. It also provides the ability to adjust the alignment at each stage of construction, ensuring controllable construction precision, high versatility, and high reusability, making it suitable for Bailey beams or Bailey beam-like truss structures of various specifications and types. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the elevation layout of the central support pier method arch frame in the 62m span arch ring of the linked arch.

[0031] Figure 2 yes Figure 1 A detailed schematic diagram of the partial connection of the Bailey beam arch frame of the present invention.

[0032] Figure 3 This is a schematic diagram of the main components in this invention.

[0033] Among them: 1. Single-end double-pin hole ear plate fully threaded screw, 101. Axis pin hole, 102. Axis external pin hole, 2. Bidirectional threaded connecting sleeve, 201. Fastening limit hole, 202. Length adjustment clip hole / screw hole, 3. Long single-end single-pin hole ear plate fully threaded screw, 4. Short single-end single-pin hole ear plate fully threaded screw. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-3 This invention provides a technical solution: a Bailey bridge arch connection, including a Bailey bridge arch, the Bailey bridge arch connection is composed of a single-end double-pin-hole ear plate fully threaded screw 1, a bidirectional threaded connecting sleeve 2, a long single-end single-pin-hole ear plate fully threaded screw 3, a short single-end single-pin-hole ear plate fully threaded screw 4, and a pin bolt. The core components of the Bailey bridge arch connection are the single-end double-pin-hole ear plate fully threaded screw 1 and the bidirectional threaded connecting sleeve 2. The single-end double-pin-hole ear plate fully threaded screw 1 has two sets of pin-hole ear plates fixed at one end of the screw, which can simultaneously perform two sets of different bolted connections. The bidirectional threaded connecting sleeve 2 is a sleeve with internal threads arranged clockwise and counterclockwise at both ends, and the bidirectional threaded connecting sleeve 2 can change the relative distance between the two connecting screws by rotating clockwise or counterclockwise.

[0036] The pin hole lugs are matched with male and female pin holes according to the chord joints of the standard Bailey bridge / truss beam segments. The two ends of the bidirectional threaded connection sleeve may be provided with screw fastening limit holes 201 that penetrate the sleeve wall thickness to constrain the rotation of the screw. The middle part of the bidirectional threaded connection sleeve may also be provided with multiple length adjustment locking holes / screw holes 202. The limit holes and length adjustment holes of the bidirectional threaded connection sleeve may also be replaced by other limit devices. The full thread of the screw may not be continuous due to processing and other factors.

[0037] A Bailey beam arch frame connection and its usage method, including the above-mentioned Bailey beam arch frame connection, with specific operations as follows:

[0038] S1. Construct arch seats or piers, and install the arch frame and arch hinges that are compatible with this invention, with the arch hinges temporarily fixed.

[0039] S2. According to the plan and calculation, the standard truss components and the connectors of the present invention are quickly initially positioned and connected to form the hoisting segment length;

[0040] S3. Hoist each segment of the arch frame or the unit segments assembled laterally onto temporary supports or brackets (or apply cable ties), and install the corresponding arch frame segments with horizontal bracing.

[0041] S4. Adjust the arch frame elevation on the support (or with the aid of the buckle), and use the bidirectional threaded connecting sleeve to adjust the connecting rod parameters so that each section of the arch frame meets the calculated pre-camber, and then fix it with the connector of the present invention;

[0042] S5. After releasing the temporary consolidation of the arch hinge, the temporary support or bracket is slowly supported (or the ties are loosened). The theoretical deviation of the arch frame line elevation is measured and recorded. With or without the use of a second support / bracket / ties, the arch frame curve is finely adjusted to the theoretical design value through the bidirectional threaded sleeve.

[0043] S6. After the ballast test, based on the ballast deformation, the bidirectional threaded connection sleeve can be used to correct it again to meet the design and construction requirements.

[0044] S7. Erect formwork and support beams for the upper structure pouring on the arch frame to complete the upper pouring construction;

[0045] S8. Use temporary supports / braces / cables to complete the segmentation of the arch frame and the removal of the arch hinges, and complete the remaining bridge construction.

[0046] Example:

[0047] like Figure 1 The image shows the Bailey bridge frame arrangement for the 9th main arch ring, with a span of 62m, of a 17-span continuous reinforced concrete sunflower-shaped arch bridge. The main arch ring uses a catenary as the optimal arch axis, with an arch axis coefficient of 2.81.

[0048] In this arch frame design, pre-embedded bolts are used to connect the arch foot components of the arch frame via the arch abutment and pier. A crawler crane on a steel trestle bridge assembles the two pre-assembled half-sections of the Bailey arch frame, one for each pile number. After the arch frame is positioned on the arch hinge and temporary supports, it is closed, and a transverse distribution beam is installed. By adjusting the length of the customized Bailey frame threaded telescopic connecting rods and setting a suitable pre-camber, the arch hinge fixing and temporary support are released, forming a double-hinged arch frame. Then, longitudinal I-beam ribs and bamboo plywood bottom formwork are erected on the transverse distribution beam for the phased pouring of the arch ring concrete.

[0049] After the arch ring is poured, a lifting beam and temporary supports are installed on the rigid arch ring. The arch frame and arch top members are then removed. Under protective measures, the arch frame can be vertically rotated and dismantled unit by unit. Finally, the arch hinge components secured with pre-embedded bolts and the temporary steel pipe supports on the water are removed. Each component is transported to the next construction arch connection work surface for reassembly and reuse.

[0050] In summary, this Bailey beam arch connection and its usage method, through the double-pin hole construction of the single-end double-pin hole lug plate and fully threaded screw, can form a stable triangular truss structure with the connecting members. Simultaneously, through the bidirectional threaded connecting sleeve with limiting holes and adjusting holes, the length of the connecting members can be quickly adjusted and locked, and the entire adjustment process basically does not interrupt or change the stress state and load-bearing capacity of the members. Obviously, due to its versatility and adjustability, the Bailey beams applicable to this invention are not limited to the standard 321 Bailey beam; various similar prefabricated assembled truss beams can also be used. Therefore, the Bailey beam arch connection proposed in this invention has a large adjustment range, allowing the arch to quickly adapt to the erection and dismantling of various engineering curves and alignments. It also possesses the ability to adjust the alignment at each stage of construction, with controllable construction precision, high versatility, and high reusability, and can be applied to Bailey beams or Bailey beam-like truss structures of various specifications and types.

[0051] This invention discloses a Bailey bridge arch connection design and construction method. Through the double-pin hole structure of the single-end double-pin hole lug plate and fully threaded screw, a stable triangular truss structure can be formed with the connecting members. Simultaneously, through the bidirectional threaded connecting sleeve with limiting holes and adjusting holes, the length of the connecting members can be quickly adjusted and locked, and the entire adjustment process basically does not interrupt or change the stress state and load-bearing capacity of the members. The Bailey bridges applicable to this invention are not limited to the standard 321 Bailey bridge, but also include reinforced Bailey bridges, 200-type Bailey bridges, or various similar prefabricated assembled truss beams.

[0052] This invention proposes a Bailey beam arch connection and its application method, solving the common problems of existing truss arch structures, such as poor versatility, limited adaptability to certain standardized truss products, limited curve adaptability, inability to accommodate small curve angles, inability to facilitate easy adjustment of the arch alignment during construction, and easy confusion and difficulty in assembling various customized members / connectors. It offers advantages such as a wide adjustment range, enabling the arch to quickly adapt to various engineering curves during erection and dismantling, the ability to adjust the alignment at each stage of construction, controllable construction precision, high versatility, high reusability, and applicability to Bailey beams or Bailey-like truss structures of various specifications and types.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for using a Bailey beam arch frame connection, characterized in that: The invention includes a Bailey beam arch frame connection, which comprises a Bailey beam arch frame. The Bailey beam arch frame connection consists of a single-end double-pin hole ear plate fully threaded screw (1), a bidirectional threaded connecting sleeve (2), a long single-end single-pin hole ear plate fully threaded screw (3), a short single-end single-pin hole ear plate fully threaded screw (4), and a pin bolt. The core components of the Bailey beam arch frame connection are the single-end double-pin hole ear plate fully threaded screw (1) and the bidirectional threaded connecting sleeve (2). The single-end double-pin hole ear plate fully threaded screw (1) has two sets of pin hole ear plates that are simultaneously connected to two different sets of bolts at one end of the screw. The pin hole lugs are matched with male and female pin hole lugs according to the chord joints of the spliced ​​standard Bailey bridge or truss beams; The Bailey arch frame has long single-end single-pin-hole ear plate threaded screws (3) at both ends, and single-end double-pin-hole ear plate threaded screws (1) at both ends. The side of the single-end double-pin-hole ear plate threaded screw (1) away from the long single-end single-pin-hole ear plate threaded screw (3) it is connected to is fixed relative to the Bailey arch frame. The entire long single-end single-pin-hole ear plate threaded screw (3) is inclined relative to the horizontal plane. A short single-end single-pin-hole ear plate fully threaded screw (4) is provided on the side of the lower single-end double-pin-hole ear plate fully threaded screw (1) away from the center vertical line of the Bailey arch frame. A short single-end single-pin-hole ear plate fully threaded screw (4) is provided on the side of the single-end double-pin-hole ear plate fully threaded screw (1) with a relatively higher horizontal plane and close to the center vertical line of the Bailey arch frame. Both the long single-end single-pin-hole ear plate fully threaded screw (3) and the short single-end single-pin-hole ear plate fully threaded screw (4) are provided with bidirectional threaded connecting sleeves (2). The specific procedures for connecting and using Bailey beam arch frames are as follows: S1. Construct arch seats or piers, and install matching arch frames and arch hinges, with the arch hinges temporarily fixed. S2. Based on the planning and calculations, quickly perform initial positioning and connection of standard truss components and connectors to form the length of the hoisting segment; S3. Hoist each segment of the arch frame or the unit segments assembled laterally onto temporary supports or brackets, or constrain them with ties, and install the corresponding arch frame segments with horizontal bracing. S4. Adjust the arch frame elevation on temporary supports or brackets or with the assistance of ties, and use bidirectional threaded connecting sleeves to adjust the connecting rod parameters so that each section of the arch frame meets the calculated pre-camber, and then fix it with connectors. S5. After releasing the temporary consolidation of the arch hinge, the temporary support or bracket is slowly supported or the ties are loosened. The theoretical deviation of the arch frame line elevation is measured and recorded. With or without the use of temporary support or bracket or ties, the arch frame curve is finely adjusted to the theoretical design value through the bidirectional threaded sleeve. S6. After the ballast test, based on the ballast deformation, use a two-way threaded connecting sleeve to correct it again until it meets the design and construction requirements. S7. Erect formwork and support beams for the upper structure pouring on the arch frame to complete the upper pouring construction; S8. Use temporary supports, brackets, or cable ties to complete the segmentation of the arch frame and the removal of the arch hinges, and complete the remaining bridge construction.

2. The method of using the Bailey beam arch frame connection according to claim 1, characterized in that: The bidirectional threaded connecting sleeve (2) is a sleeve with internal threads arranged clockwise and counterclockwise at both ends. The bidirectional threaded connecting sleeve (2) can change the relative distance between the connecting screws at both ends by rotating clockwise or counterclockwise.

3. The method of using the Bailey beam arch frame connection according to claim 1, characterized in that: The bidirectional threaded connecting sleeve is also provided with multiple length adjustment holes or screw holes (202) in the middle.

4. The method of using the Bailey beam arch frame connection according to claim 1, characterized in that: The two ends of the bidirectional threaded connecting sleeve are provided with screw fastening limiting holes (201) that penetrate the sleeve wall thickness to constrain the rotation of the screw.

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