A combined telescopic structure for a durable spring support and its installation method

Abstract

This invention discloses a durable spring support structure with a modular telescopic design, comprising two embedded parts; several elastic units are detachably arranged between the two embedded parts; each elastic unit includes several elastic steel sheets, a central beam, and two inner steel beams; the elastic steel sheets have a "Z"-shaped structure; both embedded parts are provided with snap-fit ​​grooves that match the snap-fit ​​parts. The invention adopts a modular design, and the durable spring support structure with a modular telescopic design includes easily replaceable elastic units. The elastic units are installed using mortise and tenon joints, divided into several unit bodies, utilizing elastic contraction performance to achieve easy installation and disassembly, adapting to efficient operation and maintenance work, and featuring stable installation, convenient disassembly and replacement, good stress performance, resistance to blockage, and smooth, noiseless operation.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, and in particular to a combined telescopic structure for a durable spring support. Background Technology

[0002] With the increasing number of expressways opened and put into operation in my country, the total length of highways has reached one million kilometers, marking a remarkable achievement in highway construction. Bridges are a crucial component of highway projects, and expansion joints are an essential part of the bridge structure. They ensure the free expansion and contraction of the bridge, accommodating longitudinal and lateral displacements and beam end deformation, thereby guaranteeing vehicle comfort and maintaining bridge durability. During bridge operation, due to concrete shrinkage and creep, external load impacts, natural climate, and other environmental factors, expansion joint damage or loss is a recurring and persistent problem, significantly impacting vehicle comfort and safety. Furthermore, the impact of overweight vehicles worsens driving conditions and affects the health of the bridge's main structure. Therefore, improving expansion joint maintenance technology is a key focus of daily maintenance work, playing a significant role in the safe and rapid operation of roads. Conventional methods for replacing expansion joints typically take at least one month, and only half of the road is open to traffic during the maintenance period, making it difficult to meet the current traffic volume. Therefore, the replacement rate and quality of expansion joints directly affect socio-economic benefits. Expansion joints that are easy to install, simple to replace, and possess superior integrity and durability have gradually become important indicators for evaluating their performance.

[0003] Currently, international bridge experts have conducted extensive data collection and analysis on the failure modes of bridge expansion joints, and based on existing research findings, have proposed many improvement and maintenance measures and replacement schemes for bridge expansion joints. Domestic bridge experts, considering the current state of bridges, have also conducted numerous studies on the rapid replacement of bridge expansion joints, and have proposed technologies, such as using the principle of seismic harmonic response, to study how to ensure rapid replacement of expansion joints.

[0004] Bridge expansion joints are generally classified into butt-joint type, steel-supported type, combined shear type (plate type), modular support type, and elastic device type. Bridge expansion joints are a complete set of devices that ensure smooth vehicle passage across the bridge deck and accommodate bridge structural deformation. Under the influence of temperature changes, the length of the bridge beam changes, causing displacement at the beam ends. To accommodate this displacement and maintain smooth driving, bridge expansion joints must be installed. Currently commonly used types include Maurer joints, toothed steel plate joints, plate rubber joints, U-shaped galvanized iron sheets, and TST elastic crushed stone joints. They directly bear the repeated impacts of wheel loads and are subject to complex stresses, making them the most vulnerable part of the bridge during operation and a relatively complex aspect of bridge structural maintenance.

[0005] The main types of damage to bridge expansion joints include: breakage, twisting, bending deformation or detachment of components such as side beams, middle beams, and cross beams; cracking, damage and pitting of the concrete in the cast-in-place strips on both sides, and loosening of anchorages; one end of the expansion joint being jammed or the other end being torn and detached or forming a funnel shape; blockage and unevenness of the expansion joint; aging, damage and detachment of the rubber strip, etc.

[0006] The main reasons for the damage to expansion joints are: (1) Inaccurate calculation of expansion amount or improper design. Due to the lack of detailed verification of the bridge ends during the design, or incomplete consideration of factors, the expansion joints are not suitable for the actual situation of the bridge. (2) Unqualified construction and installation technology. Due to factors such as lack of construction technical strength or backward technology, the quality of expansion joints is directly defective. (3) Untimely operation and maintenance management. The increasing number of overloaded vehicles has increased the load on the bridge to a certain extent. Expansion joint devices subjected to beam deflection displacement and heavy load impact are prone to fatigue failure under heavy traffic load. This requires timely special maintenance of expansion joint devices. Due to the lag in maintenance by management departments, irreversible damage to expansion joints has occurred.

[0007] In the routine maintenance of bridge expansion joints, repairs and replacements are frequently required. Currently, there is no simple construction method for replacing bridge expansion joints; the existing expansion joint device is usually removed and grooved, and then the anchorage area concrete is re-poured. This replacement method is not only complex, time-consuming, and labor-intensive, but also affects the quality. Furthermore, it is labor-intensive and inefficient, failing to meet the requirements of efficient, economical, and high-quality construction, operation, and maintenance of highway bridges.

[0008] Therefore, a durable spring support structure with a combined telescopic structure is needed. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] A durable spring support structure with a combined telescopic mechanism includes two embedded parts; several elastic units are detachably arranged between the two embedded parts; each elastic unit includes several elastic steel sheets, a central beam, and two inner steel beams; the elastic steel sheets have a "Z"-shaped structure; each elastic steel sheet includes a fixing plate, a telescopic plate, and a connecting plate, with the fixing plate and telescopic plate respectively located at both ends of the connecting plate; the two inner steel beams are respectively located on both sides of the central beam, and an elastic steel sheet is arranged between each inner steel beam and the central beam; the fixing plate of each elastic steel sheet is fixedly connected to the central beam, and the telescopic plate is fixedly connected to the inner side of an inner steel beam; each inner steel beam has a snap-fit ​​part on its outer side; both embedded parts have snap-fit ​​grooves that match the snap-fit ​​parts.

[0011] Furthermore, the elastic steel sheets in each elastic unit are symmetrically arranged on both sides of the central beam.

[0012] Furthermore, the inner steel beams are parallel to the middle beams, and the fixed plates and telescopic plates are also parallel to each other.

[0013] Preferably, the top of the elastic unit is equipped with a rubber sealing strip; the lower surface of the rubber sealing strip is supported by an elastic steel sheet and a central beam. The upper surface of the rubber sealing strip is designed with several continuous grooves, which facilitate drainage and debris removal, are used for waterproofing and preventing stones from getting stuck, while ensuring vehicle driving comfort and long service life.

[0014] Preferably, the combined telescopic structure of the durable spring support also includes an auxiliary installation structure; the auxiliary installation structure includes several second central beams, cross-joint beams, and pads;

[0015] Several elastic units, several second central beams, and cross-joint beams are horizontally arranged between two embedded parts, and a second central beam is set between each adjacent elastic unit; a pad is set below several elastic units, several second central beams, and cross-joint beams; the cross-joint beam is set across the expansion joint above it, with one end of the cross-joint beam being engaged with the nearest elastic unit and the other end being engaged with an embedded part; the lower end of the second central beam is in sliding contact with the pad.

[0016] Furthermore, the second middle beam is provided with a connecting groove that matches the snap-fit ​​part.

[0017] Furthermore, the connecting plates of the elastic steel sheets symmetrically arranged on both sides of the central beam are all provided with recessed clamping grooves. The clamping grooves are used by workers to clamp the grooves simultaneously with pliers during the installation of the elastic unit, so that the telescopic plates of the elastic steel sheets on both sides of the central beam move closer to each other. When the inner steel beam reaches the installation position, the elastic steel sheets on both sides of the central beam are released, and the elastic steel sheets return to their original position, causing the snap-fit ​​parts on the inner steel beam to snap into the corresponding embedded parts, cross-joint beams, or second central beams. The removal operation of the elastic unit is the reverse.

[0018] Furthermore, one end of the cross-joint beam is provided with a first snap-fit ​​groove that snaps into the snap-fit ​​part of the elastic unit, and the other end is provided with a second snap-fit ​​groove that snaps into the embedded part.

[0019] Furthermore, the cross-section of the span beam is a box-shaped structure, and the span beam is used to meet the requirements of vehicles traveling between the beams in the form of simply supported beams.

[0020] Furthermore, the pad includes a stainless steel plate and a Q345C steel plate. The stainless steel plate is fixedly installed on the upper part of the Q345C steel plate, and the upper surface of the stainless steel plate is the displacement sliding surface of the middle beam.

[0021] Furthermore, the cross-section of the central beam is I-shaped or T-shaped.

[0022] Furthermore, the second central beam has an I-shaped cross-section.

[0023] Furthermore, the embedded parts are equipped with anchor holes for inserting reinforcing bars. The embedded parts are pre-embedded in the beam body and anchored with the beam concrete to form a steel-concrete structure.

[0024] Furthermore, the snap-fit ​​part is a mortise and tenon fitting, which can be connected and fixed with the snap-fit ​​groove or connecting groove in the form of mortise and tenon fasteners, so as to facilitate installation and disassembly.

[0025] An installation method for a combined telescopic structure of a durable spring support, characterized by the following steps:

[0026] 1) On the two beams with expansion joints, insert steel bars through the anchor holes on the embedded parts, and embed the two embedded parts on the two beams respectively. The embedded parts are anchored to the corresponding beam concrete to form a steel-concrete structure.

[0027] 2) Install the expansion joint between the two beams of the prefabricated steel elastic body expansion structure according to the required width. When the width of the expansion joint is less than or equal to 60mm, only one elastic unit needs to be used to snap onto two embedded parts. The elastic unit is set above the expansion joint. When the width of the expansion joint is greater than 60mm, place the pad on one of the beams, snap one end of the cross-joint beam onto the embedded part on one beam, and set the other end of the cross-joint beam across the expansion joint onto another beam. Several elastic units are set between one end of the cross-joint beam and the embedded part. A second middle beam is set between each adjacent elastic unit. The second middle beam snaps onto the corresponding elastic unit. One end of the cross-joint beam snaps onto an adjacent elastic unit. The second middle beam and the elastic units are both set above the pad. One of the beams snaps onto the adjacent elastic unit.

[0028] 3) Cover the elastic unit with the rubber sealing tape to complete the installation.

[0029] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0030] This invention features a modular design, with a durable spring support structure comprising easily replaceable elastic units. These elastic units are installed using mortise and tenon joints, divided into several units. Utilizing their elastic contraction properties, they achieve easy installation and disassembly, facilitating efficient operation and maintenance. They are characterized by stable installation, convenient removal and replacement, good load-bearing capacity, resistance to clogging, and smooth, noiseless operation.

[0031] Secondly, the durable spring support structure can achieve a flat bridge deck and good vehicle driving conditions. It is easy to install during construction and can be integrated with the bridge structure. Compared with other types of expansion joints, it better meets the requirements of convenient and economical maintenance and replacement of expansion joints in modern highway bridges. [Attached Image Description]

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the combined telescopic structure of a durable spring support body according to the present invention;

[0034] Figure 2 This is another structural schematic diagram of the combined telescopic structure of the durable spring support body of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the elastic steel sheet in this invention;

[0036] Figure 4 This is a schematic diagram of the elastic steel sheet cross-joint beam in this invention;

[0037] Figure 5 This is a schematic diagram of the structure of the second beam in this invention;

[0038] Explanation of main component symbols

[0039]

[0040]

[0041] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention.

Detailed Implementation Methods

[0042] The following embodiments can help those skilled in the art to more fully understand the present invention, but should not be construed as limiting the present invention in any way.

[0043] Please see Figure 1-5A durable spring support structure with a combined telescopic structure includes two embedded parts 1; several elastic units 2 are detachably arranged between the two embedded parts 1; each elastic unit 2 includes several elastic steel sheets 21, a central beam 22, and two inner steel beams 23; the elastic steel sheets 21 have a "Z" shaped structure; each elastic steel sheet 21 includes a fixing plate 211, a telescopic plate 212, and a connecting plate 213, with the fixing plate 211 and the telescopic plate 212 respectively located at both ends of the connecting plate 213; the two inner steel beams 23 are respectively located on both sides of the central beam 22, and an elastic steel sheet 21 is arranged between each inner steel beam 23 and the central beam 22; the fixing plate 211 of each elastic steel sheet 21 is fixedly connected to the central beam 22, and the telescopic plate 212 is fixedly connected to the inner side of an inner steel beam 23; each inner steel beam 23 has a snap-fit ​​part 231 on its outer side; both embedded parts 1 are provided with snap-fit ​​grooves 10 that match the snap-fit ​​parts 231.

[0044] Furthermore, the elastic steel sheets 21 in each elastic unit 2 are symmetrically arranged on both sides of the central beam 22.

[0045] Furthermore, the inner steel beam 23 is parallel to the middle beam 22, and the fixed plate 211 and the telescopic plate 212 are parallel to each other.

[0046] In one embodiment of the present invention, the top of the elastic unit 2 is provided with a rubber sealing strip 24; the lower surface of the rubber sealing strip 24 is supported by an elastic steel sheet 21 and a central beam 22. The upper surface of the rubber sealing strip 24 is designed with several through grooves 241, which facilitate drainage and debris removal, are used for waterproofing and preventing stones from getting stuck, and at the same time ensure vehicle driving comfort and long service life.

[0047] In one embodiment of the present invention, the combined telescopic structure of the durable spring support body further includes an auxiliary installation structure 3; the auxiliary installation structure 3 includes a plurality of second central beams 30, cross-joint beams 31 and pads 33;

[0048] Several elastic units 2, several second central beams 30, and cross-joint beams 31 are horizontally arranged between two embedded parts 1, and a second central beam 30 is provided between each adjacent elastic unit 2; a pad 33 is provided below several elastic units 2, several second central beams 30, and cross-joint beams 31; the cross-joint beams 31 are arranged horizontally above the expansion joint, with one end of the cross-joint beam 31 being engaged with the nearest elastic unit 2, and the other end being engaged with an embedded part 1; the lower end of the second central beam 30 is in sliding contact with the pad 33.

[0049] Furthermore, the second middle beam 30 is provided with a connecting groove 301 that matches the snap-fit ​​part 231.

[0050] Furthermore, the connecting plates 213 of the elastic steel sheets 21 symmetrically arranged on both sides of the central beam 22 are all provided with concave clamping grooves 2311; the clamping grooves 2311 are used by workers to clamp the clamping grooves 2311 simultaneously with pliers during the installation of the elastic unit 2, so that the telescopic plates 212 of the elastic steel sheets 21 on both sides of the central beam 22 move closer to each other. When the inner steel beam 23 reaches the installation position, the elastic steel sheets 21 on both sides of the central beam 22 are released, and the elastic steel sheets 21 return to their original position, causing the snap-fit ​​parts 231 on the inner steel beam 23 to snap into the corresponding embedded part 1, cross-joint beam 31, or second central beam 30; the removal operation of the elastic unit 2 is the opposite.

[0051] Furthermore, one end of the cross-joint beam 31 is provided with a first snap-fit ​​groove 311 that snaps into the snap-fit ​​part 231 of the elastic unit 2, and the other end is provided with a second snap-fit ​​groove 312 that snaps into the embedded part 1.

[0052] Furthermore, the cross section of the joint beam 31 is a box-shaped structure, and the joint beam 31 is used to meet the requirements of vehicles traveling between the beams in the form of simply supported beams.

[0053] Furthermore, the pad 33 includes a stainless steel plate 331 and a Q345C steel plate 332. The stainless steel plate is fixedly installed on the upper end of the Q345C steel plate, and the upper surface of the stainless steel plate is the displacement sliding surface of the middle beam.

[0054] Furthermore, the cross-section of the central beam 22 is either I-shaped or T-shaped.

[0055] Furthermore, the second central beam has an I-shaped section (section 30).

[0056] Furthermore, the embedded part 1 is provided with anchor holes 101, which are used to insert reinforcing bars. The embedded part 1 is embedded in the beam and anchored with the concrete of the beam to form a steel-concrete structure.

[0057] Furthermore, the snap-fit ​​part 231 is a mortise and tenon fitting. The snap-fit ​​part 231 can be connected and fixed with the snap-fit ​​groove 10, the connecting groove 301, or the first snap-fit ​​groove 311 in the form of a mortise and tenon snap fastener, so as to facilitate installation and disassembly.

[0058] When an elastic unit 2 in the combined telescopic structure of the durable spring-loaded support body needs to be replaced, it can be easily replaced by quickly disassembling the damaged individual elastic unit 2. The main operations for installing an individual elastic unit 2 are: first, "pressing," pressing the elastic steel sheet 21 to bring the telescopic plates 212 of the elastic steel sheets 21 on both sides of the middle beam 22 closer together; second, "releasing," placing the inner steel beam 23, elastic steel sheet 21, and middle beam 22 to the designated position; and third, "releasing," loosening the elastic steel sheet 21 so that the inner steel beam 23 is connected and fixed to the embedded part 1, the cross-joint beam 31, or the second middle beam 30 with a tenon and mortise snap fastener. The disassembly operation is the reverse. The combined telescopic structure of the durable spring-loaded support body of this invention has a simple structure, is easy to replace, has good stress performance, and can meet the specifications.

[0059] In one embodiment of the present invention, a method for installing a combined telescopic structure of a durable spring support includes the following steps:

[0060] 1) On the two beams 40 with expansion joints, insert steel bars through the anchor holes 101 on the embedded parts 1 respectively, and embed the two embedded parts 1 into the two beams respectively. The embedded parts 1 are anchored to the corresponding beam concrete to form a steel-concrete structure.

[0061] 2) Install according to the width of the expansion joint between the two beams of the steel elastic body assembled expansion structure as needed. When the width of the expansion joint 5 is less than or equal to 60mm, only one elastic unit 2 needs to be used to snap into the two embedded parts 1. The elastic unit 2 is set above the expansion joint 5.

[0062] When the width of the expansion joint 5 is greater than 60mm, the pad 33 is placed on one of the beams. One end of the cross-joint beam 31 is engaged with the embedded part 1 on the beam, and the other end of the cross-joint beam 31 is set across the expansion joint on another beam. Several elastic units 2 are set between one end of the cross-joint beam 31 and the embedded part 1. A second middle beam 30 is set between each adjacent elastic unit 2. The second middle beam 30 is engaged with the corresponding elastic unit 2. One end of the cross-joint beam 31 is engaged with an adjacent elastic unit 2. The second middle beam 30 and the elastic unit 2 are both set above the pad 33. One of the beams is engaged with the adjacent elastic unit.

[0063] 3) Cover the elastic unit 2 with the rubber sealing tape 24 to complete the installation.

[0064] The 40-meter section of the beam is either an abutment or a box girder.

[0065] Furthermore, the upper surface of the rubber sealing strip 24 is flush with the road surface.

[0066] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A combined telescopic structure for a durable spring support, characterized in that: It includes two embedded parts; several elastic units are detachably installed between the two embedded parts; each elastic unit includes several elastic steel sheets, a central beam, and two inner steel beams; the elastic steel sheets have a "Z" shaped structure; each elastic steel sheet includes a fixing plate, a telescopic plate, and a connecting plate, with the fixing plate and telescopic plate respectively located at both ends of the connecting plate; the two inner steel beams are respectively located on both sides of the central beam, and an elastic steel sheet is installed between each inner steel beam and the central beam; the fixing plate of each elastic steel sheet is fixedly connected to the central beam, and the telescopic plate is fixedly connected to the inner side of an inner steel beam; each inner steel beam has a snap-fit ​​part on its outer side; both embedded parts have snap-fit ​​grooves that match the snap-fit ​​parts; the connecting plates of the elastic steel sheets symmetrically located on both sides of the central beam are each provided with concave clamping grooves.

2. The combined telescopic structure of the durable spring support as described in claim 1, characterized in that: The top of the elastic unit is equipped with a rubber sealing strip; the lower surface of the rubber sealing strip is supported by elastic steel sheets and a central beam.

3. The combined telescopic structure of the durable spring support as described in claim 1, characterized in that: The embedded parts are equipped with anchor holes for inserting reinforcing bars. The embedded parts are embedded in the beam body and anchored with the beam concrete to form a steel-concrete structure.

4. The combined telescopic structure of the durable spring support as described in any one of claims 1-3, characterized in that: The durable spring support's combined telescopic structure also includes an auxiliary installation structure; the auxiliary installation structure includes several second central beams, cross-joint beams, and pads; Several elastic units, several second central beams, and cross-joint beams are horizontally arranged between two embedded parts, and a second central beam is set between each adjacent elastic unit; a pad is set below several elastic units, several second central beams, and cross-joint beams; the cross-joint beam is set across the expansion joint above it, with one end of the cross-joint beam being engaged with the nearest elastic unit and the other end being engaged with an embedded part; the lower end of the second central beam is in sliding contact with the pad.

5. The combined telescopic structure of the durable spring support as described in claim 4, characterized in that: One end of the cross-joint beam is provided with a first snap-fit ​​groove that snaps into the snap-fit ​​part of the elastic unit, and the other end is provided with a second snap-fit ​​groove that snaps into the embedded part.

6. The combined telescopic structure of the durable spring support as described in claim 5, characterized in that: The cross-section of the span beam is a box-shaped structure. The span beam is used to meet the requirements of vehicles traveling between beams in the form of simply supported beams. The second middle beam is provided with a connecting groove that matches the snap-fit ​​part.

7. The combined telescopic structure of the durable spring support as described in claim 6, characterized in that: The pad consists of a stainless steel plate and a Q345C steel plate. The stainless steel plate is fixedly installed on the upper part of the Q345C steel plate, and the upper surface of the stainless steel plate is the displacement sliding surface of the middle beam.

8. The combined telescopic structure of the durable spring support as described in claim 7, characterized in that: The snap-fit ​​part is a mortise and tenon fitting. The snap-fit ​​part is connected and fixed to the snap-fit ​​groove, connecting groove or first snap-fit ​​groove in the form of mortise and tenon buckle, which is convenient for installation and disassembly.

9. A method for installing a combined telescopic structure of a durable spring support as described in any one of claims 5-8, characterized in that, Includes the following steps: 1) On the two beams with expansion joints, insert steel bars through the anchor holes on the embedded parts, and embed the two embedded parts on the two beams respectively. The embedded parts are anchored to the corresponding beam concrete to form a steel-concrete structure. 2) Install the expansion joint between the two beams of the steel elastic body assembled expansion structure according to the required width. When the width of the expansion joint is less than or equal to 60mm, only one elastic unit needs to be used to snap the two embedded parts together. The elastic unit is set above the expansion joint. When the width of the expansion joint is greater than 60mm, the pad is placed on one of the beams, one end of the cross beam is engaged with the embedded part on the beam, and the other end of the cross beam is set across the expansion joint on another beam; several elastic units are set between one end of the cross beam and the embedded part, and a second middle beam is set between each adjacent elastic unit. The second middle beam is engaged with the corresponding elastic unit, and one end of the cross beam is engaged with the adjacent elastic unit; the second middle beam and the elastic unit are both set above the pad; one of the beams is engaged with the adjacent elastic unit. 3) Cover the elastic unit with the rubber sealing tape to complete the installation.

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