A high-efficiency and environmentally friendly temporary filling structure for bridge expansion joints during construction.

Abstract

A highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during construction includes a temporary filling structure installed in a pre-reserved expansion joint slot at the end of an adjacent bridge beam. The pre-reserved expansion joint slot contains embedded reinforcing bars. The temporary filling structure comprises, from bottom to top, a gap support layer, a first filling layer, an interlayer isolation layer, and a second filling layer. One end of the gap support layer overlaps with a pre-reserved expansion joint slot on one side, and the other end overlaps with a pre-reserved expansion joint slot on the other side. This invention offers advantages such as high quality, ensuring smooth and safe passage during construction, and facilitating subsequent cleaning. The embedded reinforcing bars are also less prone to deformation and damage.

Description

Technical Field

[0001] This utility model relates to the field of bridge deck construction technology, and in particular to a highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase. Background Technology

[0002] During actual use, bridges are subject to both internal factors such as concrete shrinkage and creep, and external factors such as vehicle loads and the natural environment. The combined effect of these factors causes thermal expansion and contraction in the bridge materials. Installing bridge expansion joints ensures stable and safe deformation of the bridge under these conditions. Expansion joints are typically located at the joints between two bridge sections or between the bridge section and the abutment. They are capable of free expansion and contraction in both directions perpendicular to and parallel to the bridge axis, accommodating the deformation requirements of the bridge under different working conditions.

[0003] In bridge construction, processes such as paving the surface layer are immediate prerequisites for installing bridge expansion joints. To ensure the working conditions of these preceding processes and to meet necessary temporary traffic needs during construction, low-grade cement concrete or steel plates are typically used to temporarily treat the pre-reserved expansion joint slots at the ends of the beams. However, filling with low-grade cement concrete or laying steel plates leads to problems such as difficulty in quality control and poor durability at the pre-reserved expansion joint slots at the beam ends. This hinders smooth and safe traffic during construction. Furthermore, filling with low-grade cement concrete presents significant challenges in later cleaning, potentially causing deformation and damage to the embedded reinforcing steel.

[0004] Based on this, a highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase is designed. Utility Model Content

[0005] The present invention aims to overcome the defects in the prior art and provide a highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase. On the one hand, it has good quality and facilitates smooth and safe passage during construction; on the other hand, it is convenient for subsequent cleaning and the pre-embedded steel bars are not easily deformed or damaged.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase, comprising a temporary filling structure, wherein the temporary filling structure is arranged in the reserved expansion joint slots of the end structure of adjacent bridge beams, the reserved expansion joint slots having pre-embedded steel bars, the temporary filling structure comprising a gap support layer, a first filling layer, an interlayer isolation layer and a second filling layer arranged sequentially from bottom to top, one end of the gap support layer overlapping with one side of the reserved expansion joint slot, and the other end of the gap support layer overlapping with the adjacent reserved expansion joint slot on the other side.

[0007] In a preferred embodiment of this utility model, the gap support layer is located directly above the structural gap at the end of adjacent bridge beams, and the material of the gap support layer is steel plate.

[0008] As a preferred embodiment of this utility model, the overlap length between the gap support layer and the adjacent reserved expansion joint groove is greater than or equal to 10cm.

[0009] As a preferred embodiment of this utility model, the thickness of the first filling layer is greater than 8cm, and its thickness dimension must be greater than the height dimension of the pre-embedded steel bar.

[0010] In a preferred embodiment of this utility model, the thickness of the second filling layer is 4-6 cm.

[0011] As a preferred embodiment of this utility model, the nominal particle size of the stone used in the first filling layer is larger than the nominal particle size of the stone used in the second filling layer.

[0012] As a preferred embodiment of this utility model, the nominal particle size of the stone used in the first filling layer is between 18cm and 20cm, and the nominal particle size of the stone used in the second filling layer is between 12cm and 15cm.

[0013] As a preferred embodiment of this utility model, the material of the interlayer isolation layer is thin bamboo fiberboard, and the thickness of the interlayer isolation layer is 2-3mm.

[0014] As a preferred embodiment of this utility model, an isolation layer is further provided between the temporary filling structure and the reserved expansion joint groove, and the isolation layer is located at the bottom and side of the reserved expansion joint groove.

[0015] As a preferred embodiment of this utility model, a sealing layer is provided on the top of the second filling layer. The sealing layer is located between the end structure of the bridge beam and the second filling layer, and the width of the sealing layer is between 30cm and 50cm.

[0016] The beneficial effects of this utility model are:

[0017] 1. The filling structure of this utility model includes a gap support layer, a first filling layer, an interlayer isolation layer, and a second filling layer. Compared with filling with low-grade cement concrete or laying steel plates, it has higher strength, better durability, improves paving quality, and ensures smooth and safe passage during construction.

[0018] 2. On the one hand, the first and second filling layers of this utility model both use recycled cold-mixed asphalt with larger particle size, which is easier to clean than low-grade cement concrete. On the other hand, the embedded steel bars are located in the first filling layer with larger particle size and below the interlayer isolation layer, making it easier to clean the embedded steel bars.

[0019] 3. The isolation layer of this utility model isolates the reserved expansion joint groove and the temporary filling structure, which facilitates the cleaning of the subsequent filling structure, while the sealing layer plays a role in sealing water, so that the filling structure can be formed quickly and facilitates passage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] The attached diagram is labeled as follows: 1. Bridge beam end structure; 2. Isolation layer; 3. Temporary filling structure; 4. Sealing layer; 11. Reserved expansion joint groove; 12. Embedded steel bar; 31. Gap support layer; 32. First filling layer; 33. Interlayer isolation layer; 34. Second filling layer. Detailed Implementation

[0022] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figure 1 As shown, a high-efficiency and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase includes a temporary filling structure 3. The temporary filling structure 3 is arranged in the reserved expansion joint slot 11 of the end structure 1 of the adjacent bridge beam. The reserved expansion joint slot 11 has embedded steel bars 12. The temporary filling structure 3 includes a gap support layer 31, a first filling layer 32, an interlayer isolation layer 33 and a second filling layer 34 arranged sequentially from bottom to top. One end of the gap support layer 31 overlaps with one side of the reserved expansion joint slot 11, and the other end of the gap support layer 31 overlaps with the adjacent reserved expansion joint slot 11 on the other side.

[0024] Specifically, the gap support layer 31 crosses the gap of the adjacent bridge beam end structure 1 and connects the adjacent bridge beam end structure 1, thereby enabling the first filling layer 32, the interlayer isolation layer 33 and the second filling layer 34 located sequentially on the gap support layer 31 to be stably filled in the reserved expansion joint groove 11.

[0025] The filling structure 3 of this utility model includes a gap support layer 31, a first filling layer 32, an interlayer isolation layer 33, and a second filling layer 34. Compared with filling with low-grade cement concrete or laying steel plates, it has higher strength, better durability, improves paving quality, and ensures smooth and safe passage during construction.

[0026] Furthermore, the specific structure of temporary filling structure 3 is described in detail.

[0027] The gap support layer 31 is located directly above the gap at the end structure 1 of the adjacent bridge beam. The material of the gap support layer 31 is steel plate, which is laid along the route direction and the width is determined according to the actual width of the gap. The overlap length between the gap support layer 31 and the adjacent reserved expansion joint groove 11 is greater than or equal to 10cm, which serves to prevent the first filling layer 32, the interlayer isolation layer 33 and the second filling layer 34 from sinking along the gap or debris from falling.

[0028] The aggregate used in the first filler layer 32 and the second filler layer 34 is recycled cold patch asphalt mixture. It utilizes old asphalt pavement milling material (RAP), which is screened and graded to obtain two particle sizes: coarse and fine. These particles are then mixed in a certain proportion to form mixtures with different diameters, namely fine-grained recycled cold patch asphalt mixture and medium-grained recycled cold patch asphalt mixture.

[0029] It should be noted that the cold patching fluid used in recycled cold patch asphalt mixtures is made from base asphalt, diesel fuel, recycling agent, anti-stripping agent and other additives. Since old asphalt pavement milling material (RAP) contains asphalt, the asphalt will be partially reduced after being soaked in diesel fuel thinner, thus restoring the bonding effect. Therefore, the amount of cold patching fluid used in recycled cold patch asphalt mixtures is lower than that in ordinary cold patch asphalt mixtures.

[0030] To ensure the properties of the recycled cold patch asphalt mixture particles to bond together and not loosen under low temperature conditions, a cohesive index (residual rate) test is conducted to verify its performance. The residual rate should be greater than 75%.

[0031] The thickness of the first filler layer 32 is greater than 8cm, and its thickness must be greater than the height of the embedded steel bar 12. The first filler layer 32 is a medium-grained recycled cold-patch asphalt mixture. The nominal particle size of the stone used in the first filler layer 32 is between 18cm and 20cm, and the maximum nominal particle size is preferably 19mm. The nominal particle size of the stone used in the first filler layer 32 is greater than the nominal particle size of the stone used in the second filler layer 34. The thickness of the second filler layer 34 is 4-6cm. The second filler layer 34 is a fine-grained recycled cold-patch asphalt mixture. The nominal particle size of the stone used in the second filler layer 34 is between 12cm and 15cm, and the maximum nominal particle size is preferably 13.2mm.

[0032] The interlayer isolation layer 33 is made of thin bamboo fiberboard, and the thickness of the interlayer isolation layer 33 is 2-3mm. It improves the integrity of the filling structure 3, plays a protective role for the embedded steel bars 12, and prevents stress concentration.

[0033] On the one hand, the first filling layer 32 and the second filling layer 34 both use recycled cold-patch asphalt mixture with larger particle size, which is easier to clean than low-grade cement concrete. On the other hand, the pre-embedded steel bar 12 is located in the first filling layer 32 with larger particle size and is located below the interlayer isolation layer 33, making it difficult to clean the pre-embedded steel bar.

[0034] Furthermore, the specific structures of the isolation layer 2 and the edge sealing layer 4 are described in detail.

[0035] An isolation layer 2 is also provided between the temporary filling structure 3 and the reserved expansion joint groove 11. The isolation layer 2 is made of asphalt felt and fully covered with the bottom and sides of the reserved expansion joint groove 11. After full coverage, emulsified asphalt tack coat is applied or sprayed.

[0036] The top of the second filling layer 34 is provided with an edge sealing layer 4. The edge sealing layer 4 is located between the bridge beam end structure 1 and the second filling layer 34. The edge sealing layer 4 is a crack-resistant adhesive. The width of the edge sealing layer 4 is between 30cm and 50cm. The width of the edge sealing layer 4 is selected as 32cm or 48cm.

[0037] The isolation layer 2 separates the reserved expansion joint groove 11 from the temporary filling structure 3, facilitating the subsequent cleaning of the filling structure 3.

[0038] The edge sealing layer 4 acts as a water seal, allowing the filling structure 3 to be formed quickly and facilitating passage.

[0039] Specifically, the implementation of a highly efficient and environmentally friendly temporary filling structure for bridge expansion joints during the construction phase includes the following steps.

[0040] Step 1: Remove loose material, dust, water, etc. from the reserved expansion joint groove 11 at the end structure 1 of the bridge beam, and keep the bottom and walls of the groove clean and dry;

[0041] Step 2: Lay tarpaulin along the contour of the bottom and walls of the trench as a separation layer 21 for the sides and bottom, and spray or brush a layer of emulsified asphalt tack coat evenly, with a dosage of 0.3~0.7 kg / m2.

[0042] Step 3: After the emulsified asphalt breaks down, place a steel plate as a gap support layer 31 directly above the gap in the groove along the route direction. The width of the steel plate and the effective overlap length of the concrete on both sides of the groove gap shall not be less than 10 cm.

[0043] Step 4: Backfill with medium-grained recycled cold-patch asphalt mixture as the first fill layer 32. The backfill thickness should be greater than 8cm and higher than the height of the pre-embedded steel bars 12. After the backfill is evenly laid, compaction should be carried out immediately. The initial compaction adopts the method of compacting the perimeter first and then the middle. Each compaction should overlap by a certain width. The secondary compaction and final compaction adopt the method of compaction in both longitudinal and transverse directions.

[0044] Step 5: Apply a layer of emulsified asphalt tack coat to the top of the first filling layer 32, with a dosage of 0.3~0.7 kg / m2. After the emulsion breaks, lay a 2~3mm thin bamboo fiberboard as an interlayer isolation layer 33.

[0045] Step 6: Apply a layer of emulsified asphalt tack coat to the top of the interlayer isolation layer 33, at a dosage of 0.3~0.7 kg / m2. After demulsification, backfill with fine-grained recycled cold patch asphalt mixture as the second filler layer 34, with a backfill thickness of 4~6cm, ensuring that the backfill fills the groove and the center is slightly higher than the ground line and convex. Compact immediately. The initial compaction adopts the method of compacting the perimeter first and then the center, and each compaction should overlap by a certain width. The secondary and final compaction adopt the method of alternating compaction in both longitudinal and transverse directions.

[0046] Step 7: After compaction, lay anti-crack tape as the top sealing layer 22. The width of the anti-crack tape is 32cm or 48cm.

[0047] Step 8: After the repairs are completed and the site is cleaned up, traffic can be opened.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0049] Although this paper uses many reference numerals from the figures, such as 1. Bridge beam end structure, 2. Isolation layer, 3. Temporary filling structure, 4. Sealing layer, 11. Reserved expansion joint groove, 12. Embedded steel bar, 31. Gap support layer, 32. First filling layer, 33. Interlayer isolation layer, and 34. Second filling layer, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A kind of construction stage bridge expansion joint high-efficiency environmental protection type temporary filling structure, it is characterized in that, The temporary filling structure (3) is arranged in the reserved expansion joint slot (11) of the end structure (1) of the adjacent bridge beam. The reserved expansion joint slot (11) has embedded steel bars (12). The temporary filling structure (3) includes a gap support layer (31), a first filling layer (32), an interlayer isolation layer (33) and a second filling layer (34) arranged sequentially from bottom to top. One end of the gap support layer (31) overlaps with the reserved expansion joint slot (11) on one side, and the other end of the gap support layer (31) overlaps with the reserved expansion joint slot (11) on the other side.

2. The construction stage bridge expansion joint efficient environmental protection type temporary filling structure according to claim 1, characterized in that, The gap support layer (31) is located directly above the gap between the end structures (1) of the adjacent bridge beams, and the material of the gap support layer (31) is steel plate.

3. The construction stage bridge expansion joint temporary filling structure according to claim 2, characterized in that, The overlap length between the gap support layer (31) and the adjacent reserved expansion joint groove (11) is greater than or equal to 10cm.

4. The construction stage bridge expansion joint temporary filling structure according to claim 1, characterized in that, The thickness of the first filling layer (32) is greater than 8cm, and its thickness dimension must be greater than the height dimension of the pre-embedded steel bar (12).

5. The construction stage bridge expansion joint temporary filling structure according to claim 4, characterized in that, The thickness of the second filler layer (34) is 4-6 cm.

6. The efficient and environmentally friendly temporary filling structure for bridge expansion joints during construction, as described in claim 5, is characterized in that... The nominal particle size of the stone used in the first filling layer (32) is greater than that of the stone used in the second filling layer (34).

7. The construction stage bridge expansion joint temporary filling structure according to claim 6, characterized in that, The nominal particle size of the stone used in the first filling layer (32) is between 18cm and 20cm, and the nominal particle size of the stone used in the second filling layer (34) is between 12cm and 15cm.

8. The construction stage bridge expansion joint temporary filling structure according to claim 1, characterized in that, The material of the interlayer isolation layer (33) is thin bamboo fiberboard, and the thickness of the interlayer isolation layer (33) is 2-3mm.

9. The construction stage bridge expansion joint temporary filling structure according to claim 1, characterized in that, An isolation layer (2) is also provided between the temporary filling structure (3) and the reserved expansion joint groove (11), and the isolation layer (2) is located at the bottom and side of the reserved expansion joint groove (11).

10. The construction stage bridge expansion joint temporary filling structure according to claim 1, characterized in that, The top of the second filling layer (34) is provided with a sealing layer (4), which is located between the bridge beam end structure (1) and the second filling layer (34). The width of the sealing layer (4) is between 30cm and 50cm.

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