Bridge expansion joint construction structure

Abstract

This utility model discloses a construction structure for bridge expansion joints, characterized by comprising: a precast T-beam, wherein the top plate of the precast T-beam is lowered below the original top plate position to form an end slot at the original top plate position; longitudinal connecting reinforcement, one end of which is pre-embedded in the top plate of the precast T-beam and the other end extends into the end slot; a sealing plate, which is cast into the end slot of the precast T-beam; expansion joint device connecting reinforcement, which is pre-embedded in the sealing plate and connected to the reinforcement skeleton and longitudinal connecting reinforcement within the sealing plate; and an expansion joint device, which is connected to the expansion joint device connecting reinforcement. This utility model solves the problem that traditional slot construction methods are prone to inaccurate positioning of pre-embedded reinforcement and large dimensional errors, which affect the construction of expansion joints.

Description

Technical Field

[0001] This utility model belongs to the field of bridge construction technology, and specifically relates to a bridge expansion joint construction structure. Background Technology

[0002] Expansion joint construction is commonly involved in highway engineering, municipal road engineering, railway engineering and bridge engineering, and expansion joint technology has become relatively mature after many years of development.

[0003] For the construction of bridge expansion joints, the slot construction method is currently widely used. The specific steps are as follows: During the prefabrication of the beam segments, expansion joint device connecting steel bars are pre-embedded at the beam ends; after the asphalt paving is completed, the expansion joint slot is precisely positioned, and a cutting machine is used to cut along the marked line. Subsequently, a pneumatic drill and a hydraulic rock drill are used to break up the asphalt and concrete inside the expansion joint slot, and the concrete debris is cleaned up; the pre-embedded expansion joint device connecting steel bars are corrected to ensure that their position and quantity meet the design requirements; the expansion device is hoisted into place, and its centerline is checked to ensure it coincides with the beam joint centerline and that its top surface is consistent with the road surface elevation, and adjustments are made as needed; the expansion joint device is welded and tied to the pre-embedded expansion joint device connecting steel bars to ensure its firmness and reliability.

[0004] In the slotted construction method, since the reinforcing bars connecting the expansion joint device are pre-embedded at the beam ends, the expansion joint device can be installed after the slot is cleaned and the positioning and reserved dimensions of the pre-embedded bars meet the design requirements. However, because the reinforcing bars connecting the expansion joint device are pre-embedded during the precast beam segment, it is difficult to ensure that the positioning and reserved dimensions of the pre-embedded bars meet the design requirements on site due to factors such as construction quality. This will have the following adverse effects on subsequent installation work: First, the welding points may not align, affecting the anchorage strength of the expansion joint device. Second, insufficient reserved dimensions require breaking the beam end for re-embedding, increasing construction costs and affecting the quality of the beam. Third, the pre-embedded bars are easily damaged during the slotting process, affecting the installation quality of the subsequent expansion joint device. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a construction structure for bridge expansion joints, aiming to solve the problems that traditional slot construction methods are prone to, such as inaccurate positioning of pre-embedded reinforcement and large dimensional errors, which affect the construction of expansion joints.

[0006] This utility model is achieved through the following technical solution.

[0007] A bridge expansion joint construction structure, characterized in that it comprises:

[0008] A precast T-beam, wherein the top plate of the precast T-beam is lowered below the original top plate position to form an end groove at the original top plate position;

[0009] Longitudinal connecting steel bars, one end of which is embedded in the top slab of the precast T-beam and the other end extends into the end slot;

[0010] A sealing plate, which is cast into the end slot of a precast T-beam;

[0011] The expansion joint device is connected to the reinforcing bars, which are embedded in the sealing plate and connected to the reinforcing bar skeleton and longitudinal connecting bars in the sealing plate.

[0012] An expansion joint device, wherein the expansion joint device is connected to the reinforcing steel bar.

[0013] Preferably, the thickness of the end plate is 0.3-0.5 times the original thickness.

[0014] Preferably, the longitudinal connecting steel bars are formed by extending the steel bars in the top slab of the precast T-beam into the end slot.

[0015] Preferably, the sealing plate is made of concrete of the same grade as the top plate of the precast T-beam.

[0016] Preferably, the present invention also includes a bridge deck pavement layer laid on the top slab of the precast T-beam, and a backfill repair layer laid on the top surface of the sealing slab at the same elevation as the bridge deck pavement layer.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: In this utility model, by lowering the top of the precast T-beam to form an end groove, and then installing a cast-in-place sealing plate in the end groove, and simultaneously embedding expansion joint device connecting steel bars, it is not necessary to pre-embed expansion joint device connecting steel bars during the precast T-beam processing. Compared with the traditional groove construction method, it has the following advantages: First, it avoids the problem of damaging the reserved steel bars when breaking the groove in the traditional method; second, when breaking the concrete in the groove, there is no need to worry about damaging the pre-embedded expansion joint device connecting steel bars, thus speeding up the construction speed; third, when casting the sealing plate, the expansion joint device connecting steel bars can be accurately tied and welded for positioning, avoiding the problems of inaccurate positioning and excessive dimensional errors of the expansion joint device connecting steel bars, and enhancing the anchorage connection quality between the expansion joint device and the steel bars. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the prefabricated T-beam in this utility model;

[0019] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the main structure during the installation of precast T-beams;

[0021] Figure 4This is a top-view structural diagram of a wet joint during construction.

[0022] Figure 5 This is a schematic diagram of the main structure during bridge deck paving.

[0023] Figure 6 This is a schematic diagram of the main structure during the construction of the sealing slab;

[0024] The meanings of the labels in the above figures are as follows: 1. Precast T-beam, 101. End top plate, 102. End groove, 103. Longitudinal connecting steel bar, 2. Sealing plate, 3. Steel cage, 301. Expansion joint device connecting steel bar, 4. Expansion joint device, 5. Bridge deck pavement layer, 6. Backfill repair layer, 7. Expansion joint gap, 8. Backfill material, 9. Bridge deck pavement layer, 10. Steel plate, 11. Wet joint, 12. Pier, 13. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are merely illustrative examples of the present invention, but the scope of protection of the present invention is not limited thereto. The described embodiments are only some embodiments of the present invention, 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.

[0026] Example 1

[0027] This embodiment provides a construction structure for a bridge expansion joint. Please refer to [link / reference]. Figure 1 and Figure 2 It includes:

[0028] A precast T-beam 1, wherein the end plate 101 of the precast T-beam 1 is lowered below the original end plate position to form an end groove 102 at the original end plate position;

[0029] Longitudinal connecting steel bar 2, one end of which is embedded in the top plate of the precast T beam 1 and the other end extends into the end slot 102;

[0030] The sealing plate 3 is cast into the end slot 102 of the precast T-beam;

[0031] The expansion joint device connecting steel bar 4 is embedded in the sealing plate 3 and connected to the steel bar skeleton 301 and longitudinal connecting steel bar 2 in the sealing plate 3.

[0032] Expansion joint device 5, wherein the expansion joint device 5 is connected to the expansion joint device connecting steel bar 4;

[0033] Unlike existing technologies, this utility model improves conventional precast T-beams in the following ways; for details, please refer to [link / reference]. Figure 1 Based on the construction location of the expansion joint, the top plate of the precast T-beam 1, i.e., the end top plate 101, is cut at the location of the expansion joint groove using the traditional groove construction method and lowered below the original end top plate position to form an end groove 102 at the original end top plate position. This leaves space for the in-situ casting of the sealing plate 3. At this time, the end top plate 101 mainly serves as the bottom plate of the in-situ casting of the sealing plate 3. Based on the above improvement, when constructing the expansion joint, it is not necessary to pre-embed the expansion joint device connecting steel bars at the end top plate 101 position during the precast T-beam processing. Instead, the expansion joint device connecting steel bars are pre-embedded during the in-situ casting of the sealing plate 3. Therefore, it has the following advantages compared to the traditional groove construction method:

[0034] First, the reinforcing bars connecting the expansion joint device are pre-embedded when the sealing plate is cast in place after the groove is broken. This avoids the problem of damaging the reserved reinforcing bars when the groove is broken in the traditional method. At the same time, since there is no need to worry about damaging the pre-embedded reinforcing bars connecting the expansion joint device, the construction speed is accelerated.

[0035] Secondly, when casting the grooving slab, the connecting steel bars of the expansion joint device can be precisely tied and welded, which not only avoids the problems of inaccurate positioning and excessive dimensional error of the connecting steel bars of the expansion joint device, but also enhances the connection quality between the connecting steel bars of the expansion joint device and the longitudinal connecting steel bars.

[0036] In this embodiment, after the position of the end plate 101 is lowered, it mainly bears a certain pressure to serve as the bottom plate for the subsequent pouring of the sealing plate 3. Therefore, its thickness can be reduced to a certain extent. Furthermore, in a preferred embodiment, the thickness of the end plate 101 is 0.3-0.5 times the original thickness.

[0037] To facilitate the installation of the longitudinal connecting steel bars 2, in a preferred embodiment, the longitudinal connecting steel bars 2 are formed by extending the steel bars in the top slab of the precast T-beam 1 into the end slot 102.

[0038] Furthermore, in a preferred embodiment, the sealing plate 3 is cast using concrete of the same grade as the top plate of the precast T-beam 1.

[0039] Furthermore, in a preferred implementation scheme, please refer to Figure 1 and Figure 2 The present invention also includes a bridge deck pavement layer 6 laid on the top slab of the precast T-beam, and a backfill repair layer 7 laid on the top surface of the sealing slab 3 and at the same elevation as the bridge deck pavement layer 6.

[0040] Example 2

[0041] This embodiment provides a construction method for the bridge expansion joint construction structure described in Embodiment 1. Please refer to [link / reference]. Figures 1 to 6 It includes the following steps:

[0042] S1. Processing precast T-beams

[0043] 1. Determine the relevant dimensions of the precast T-beams with irregular top slabs according to the bridge span, including beam length, beam height, and top slab width, etc.; determine the reduction height H and thickness h of the end top slab 101 by comprehensively considering the structural design requirements of the precast T-beams with irregular top slabs, the design requirements of the expansion joint device, and the embedment depth requirements of the connecting steel bars of the subsequent pre-embedded expansion joint device; design the prestressing and reinforcement of the precast beams with reference to relevant design specifications.

[0044] 2. Precast T-beams are fabricated according to the bridge erection sequence. The precasting process of the precast T-beams is the same as the traditional method. However, since the height of the end plate 101 of the improved precast T-beam is reduced by H compared to the original plate, and the thickness of the plate after the reduction is h, the mold required for the improved precast T-beam is different from that of the conventional precast T-beam. A specific template needs to be designed at the end plate 101 to meet the requirements of casting the end slot 102. That is, after the end plates 101 on both sides are cast, a "trapezoidal" template is used to cover and fix the end plates 101 between them. Then, the casting continues to the top of the precast T-beam, and the top plate reinforcement is led out at the slot to form the longitudinal connecting reinforcement 2. Since there are special cases such as the local reduction of the end plate after the beam is improved, attention should be paid to the precasting of the above special parts and the protection of the finished product after casting in the construction process.

[0045] S2. Install precast T-beams

[0046] Please see Figure 3 and Figure 4 Precast T-beams were installed on pier 13 according to the bridge erection sequence. The installation method of the precast T-beams was the same as the traditional method.

[0047] S3, Construction wet joint

[0048] Please see Figure 4 The wet joint 12 is constructed in the traditional way. When the wet joint 12 is poured to the top plate 101 at the end, a local reduction treatment is carried out simultaneously.

[0049] S4, Backfilling of the trench

[0050] Please see Figure 5 A steel plate 11 with a width slightly larger than the width of the expansion joint 8 is placed on the expansion joint gap 8. Backfill material 9 with strength that meets the passage requirements is filled into the concave groove 103 formed by the adjacent end groove 102 of the precast T beam, so as to ensure that the bridge deck has the passage conditions for large construction machinery and equipment.

[0051] S5, Bridge deck paving

[0052] Please see Figure 5 The bridge deck paving was carried out using traditional methods according to the design requirements to form a bridge deck paving layer 10.

[0053] S6, Construction sealing plate

[0054] Please see Figure 6 Remove the bridge deck pavement layer 10 at the concave groove 103 position, remove the backfill material 9 in the groove, remove the steel plate 11, install the expansion joint device connecting steel bar 4 and steel bar skeleton 301, and pour the sealing plate 3 in the end groove 102 on both sides according to the design elevation of the expansion joint device.

[0055] S7. Install expansion joint devices

[0056] Please see Figure 2 After the sealing plate 3 reaches the design strength, the expansion joint device 5 is installed in the traditional way.

[0057] S8. Backfilling and Repair Treatment

[0058] Please see Figure 2 After the expansion joint device 5 is installed, the backfill repair layer 7 is constructed according to the elevation of the bridge deck pavement layer 10.

Claims

1. A bridge joint construction structure characterized by comprising: include: A precast T-beam, wherein the top plate of the precast T-beam is lowered below the original top plate position to form an end groove at the original top plate position; Longitudinal connecting steel bars, one end of which is embedded in the top slab of the precast T-beam and the other end extends into the end slot; A sealing plate, which is cast into the end slot of a precast T-beam; The expansion joint device is connected to the reinforcing bars, which are embedded in the sealing plate and connected to the reinforcing bar skeleton and longitudinal connecting bars in the sealing plate. An expansion joint device, wherein the expansion joint device is connected to the reinforcing steel bar.

2. The bridge expansion joint construction structure as described in claim 1, characterized in that, The thickness of the end plate is 0.3-0.5 times the original thickness.

3. The bridge expansion joint construction structure as described in claim 1, characterized in that, The longitudinal connecting steel bars are formed by extending the steel bars in the top slab of the precast T-beam to the end slot.

4. The bridge expansion joint construction structure as described in claim 1, characterized in that, The sealing plate is made of concrete of the same grade as the top plate of the precast T-beam.

5. The bridge expansion joint construction structure as described in claim 1, characterized in that, It also includes the bridge deck pavement layer laid on the top slab of the precast T-beams, and the backfill repair layer laid on the top surface of the sealing slab at the same elevation as the bridge deck pavement layer.

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