A vibration method during the pouring process of precast T-beams

Abstract

The present invention discloses a vibration method during the pouring process of precast T-beams, which includes: at least two rows of surface vibrators are respectively arranged on both sides of the formwork; in the early stage, a concrete pouring test is carried out, and in combination with the concrete slump and the concrete temperature entering the formwork, the shape diagram of the concrete in the formwork during the pouring process is statistically analyzed. According to the shape of the concrete in the formwork after each batching, the surface vibrators capable of vibrating the concrete in the formwork are correspondingly started. At the same time, an internal vibrator is used to vibrate the concrete; observe the appearance quality of the T-beam body after forming, and form a matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators. By means of the present invention, the forming quality of the T-beam can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of precast beam production methods, and in particular to a vibration method during the casting of precast T-beams. Background Art

[0002] A T-beam refers to a beam with a T-shaped cross-section. The two protruding parts on both sides are called the top plates, and the middle part is called the rib plate. Compared with a rectangular beam, a T-beam can save concrete, reduce the self-weight of the component, and improve the spanning ability. Highway bridges, especially mountain highways, generally use T-beam structures.

[0003] Currently, the construction technology of precast T-beams is in a stage of gradual maturity. Improving the casting quality of precast T-beams has become the focus of research on precast T-beam construction technology, which has a significant impact on the safety and stability of highway bridges. The process of precast T-beams generally includes: bottom formwork installation → steel bar binding → hanging rib plate steel bars → threading pipes → installing formwork → binding top plate steel bars → casting concrete. Among them, the forming quality of concrete is crucial for the quality of T-beams. To ensure the forming quality of concrete, it is necessary to vibrate the concrete during the concrete casting process. However, if over-vibrated, it will not only be time-consuming and laborious, but may also cause bleeding and segregation of the concrete, and finally lead to peeling on the beam surface. And single vibration may not meet the vibration requirements, resulting in honeycombing and pitting on the beam body and air bubbles inside. Therefore, researching a comprehensive vibration method is of great significance for improving the quality of precast T-beams. Summary of the Invention

[0004] The present invention discloses a vibration method during the casting of precast T-beams, which can effectively improve the forming quality of T-beams.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A vibration method during the casting of precast T-beams includes:

[0007] At least two rows of surface vibrators are respectively arranged on both sides of the formwork, and the vibration range of the surface vibrators can ensure that the concrete throughout the length of the beam is vibrated;

[0008] Conduct a concrete casting test in the early stage. Combining the concrete slump and the concrete temperature when entering the formwork, statistically analyze the shape diagram of the concrete in the formwork during the casting process. According to the shape of the concrete in the formwork after each batching, start the surface vibrators that can vibrate the concrete in the formwork correspondingly, and at the same time, use an internal vibrator to vibrate the concrete;

[0009] Observe the appearance quality of the T-beam body after forming, and form a matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators.

[0010] Furthermore, the construction steps based on the matching diagram of concrete shape and the starting sequence of the surface vibrator considering the concrete slump factor include:

[0011] S1. Select the concrete slump at the prestressed duct part to be controlled within 180 - 200 cm, and perform manual placing of concrete;

[0012] S2. Pour the T - beam rib slab:

[0013] The length of the T - beam is represented by L;

[0014] The first hopper discharging: Discharge from the left end of the T - beam, control the concrete flow rate at 0.015 - 0.019 m 3 / s and the forward speed at 0.055 - 0.065 m / s, and evenly place the concrete within the range of 0 - L 1 , where L 1 is L / 5 - L / 4. At the same time, turn on the surface vibrator that can vibrate the concrete in the formwork, and use an internal vibrator to vibrate the concrete;

[0015] The second hopper discharging: Start discharging from the position L 1 from the left end of the T - beam, control the concrete flow rate at 0.015 - 0.019 m 3 / s and the forward speed at 0.055 - 0.065 m / s, and evenly place the concrete within the range of L 1 -L 2 , where L 2 is 2L 1 . At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use an internal vibrator to vibrate the concrete;

[0016] The third hopper discharging: Start discharging from the position L 2 from the left end of the T - beam, control the concrete flow rate at 0.015 - 0.019 m 3 / s and the forward speed at 0.055 - 0.065 m / s, and evenly place the concrete within the range of L 2 -L 3 , where L 3 is 3L 1 . At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use an internal vibrator to vibrate the concrete;

[0017] The fourth hopper discharging: Discharge from the right end of the T - beam, control the concrete flow rate at 0.015 - 0.019 m 3 / s and the forward speed at 0.055 - 0.065 m / s, and evenly place the concrete within the range of L - L 3 . At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use an internal vibrator to vibrate the concrete;

[0018] Fifth hopper discharging: Discharge from the left end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the forward speed to be 0.011 - 0.013 m / s, and evenly distribute the concrete within the range of 0 - L 4 , where L 4 is L / 2. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork, and use the internal vibrator to vibrate the concrete;

[0019] Sixth hopper discharging: Discharge from the right end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the forward speed to be 0.011 - 0.013 m / s, and evenly distribute the concrete within the range of L - L 4 , and at the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork, and use the internal vibrator to vibrate the concrete;

[0020] Repeat the steps of the fifth hopper discharging and the sixth hopper discharging until the casting of the T-beam rib slab is completed;

[0021] S3. Casting the T-beam top slab: When casting the T-beam top slab, use the internal vibrator to vibrate the concrete.

[0022] Furthermore, in step S2, during the process of casting the T-beam rib slab, the internal vibrator is inserted section by section for vibration, the spacing of each section is 28 - 35 cm, and the vibration range is the length part of the formwork covered by the newly poured concrete.

[0023] Furthermore, in step S2, when casting the T-beam rib slab, the surface vibrator is turned on for 11 - 15 s each time.

[0024] Furthermore, in step S3, the internal vibrator is inserted section by section for vibration, and the spacing of each section is 38 - 45 cm.

[0025] Furthermore, in step S2, 1.6 - 2.0 m 3 of concrete is discharged for each hopper.

[0026] Furthermore, in step S2, during the process of discharging from the first hopper to the fourth hopper, control the concrete flow rate to be 0.017 m 3 / s and the forward speed to be 0.06 m / s.

[0027] Furthermore, in step S2, during the process of discharging from the fifth hopper to the sixth hopper, control the concrete flow rate to be 0.017 m 3 / s and the forward speed to be 0.12 m / s.

[0028] Furthermore, in step S2, when pouring the T-beam rib slab, the attached vibrator is turned on for 12 s each time.

[0029] Furthermore, in step S2, during the pouring of the T-beam rib slab, the internal vibrator is inserted section by section for vibration, and the distance between each section is 30 cm.

[0030] By using the vibration method during the pouring of the precast T-beam described above, according to the flow direction and shape of the concrete in the formwork after each batching, the attached vibrator that can vibrate the concrete in the formwork is correspondingly started, and at the same time, the internal vibrator is used to vibrate the concrete, which can vibrate the concrete point by point in a targeted manner, saving manpower and material resources and realizing efficient construction. In addition, through the combination of the vibration time of the vibrator and the vibration distance of the internal vibrator, the proper vibration of the concrete in the formwork is realized, effectively improving the appearance quality of the precast T-beam and ensuring the forming quality of the precast T-beam. Brief Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the formwork situation after the first hopper of feeding is completed in the embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the formwork situation after the second hopper of feeding is completed in the embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the formwork situation after the third hopper of feeding is completed in the embodiment of the present invention.

[0034] Figure 4 It is a schematic diagram of the formwork situation after the fourth hopper of feeding is completed in the embodiment of the present invention.

[0035] Figure 5 It is a schematic diagram of the formwork situation after the fifth hopper of feeding is completed in the embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the formwork situation after the sixth hopper of feeding is completed in the embodiment of the present invention.

[0037] Figure 7 It is an external view of the T-beam after pouring in the embodiment of the present invention.

[0038] Figure 8 It is an external view of the T-beam after pouring in the comparative example. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] A vibration method during the casting of precast T-beams includes:

[0041] At least two rows of surface vibrators are respectively arranged on both sides of the formwork, and the vibration range of the surface vibrators can ensure that the concrete throughout the length of the beam is vibrated.

[0042] In the early stage, a concrete casting test is carried out. Combining the concrete slump and the concrete temperature entering the formwork, the shape diagram of the concrete in the formwork during the casting process is statistically analyzed. According to the shape of the concrete in the formwork after each batching, the surface vibrators that can vibrate the concrete in the formwork are correspondingly started. At the same time, an internal vibrator is used to vibrate the concrete.

[0043] Observe the appearance quality of the T-beam body after it is formed, and form a matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators.

[0044] Further, the construction steps based on the matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators include:

[0045] S1. Control the concrete slump at the position with prestressed ducts to be 180 - 200 cm, and perform manual batching.

[0046] S2. Cast the rib slab of the T-beam:

[0047] The length of the T-beam is represented by L.

[0048] The first batch of discharging: Discharge from the left end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the forward speed to be 0.055 - 0.065 m / s, and uniformly batch the material within the range of 0 - L 1 , where L 1 is L / 5 - L / 4. At the same time, start the surface vibrators that can vibrate the concrete in the formwork, and use an internal vibrator to vibrate the concrete.

[0049] The second batch of discharging: Start discharging from the position L 1 from the left end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the forward speed to be 0.055 - 0.065 m / s, and within the range of L 1 -L 2Uniformly distribute the material within the range of, L 2 is 2L 1 , while turning on the surface vibrator that can vibrate the concrete inside the formwork, and inserting a vibrating rod to vibrate the concrete. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, and use the inserted vibrating rod to vibrate the concrete;

[0050] Third hopper discharging: Start discharging from the left end of the T-beam at a position of L 2 , control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the advancing speed to be 0.055 - 0.065 m / s, and uniformly distribute the material within the range of L 2 -L 3 , L 3 is 3L 1 , while continuing to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, and use the inserted vibrating rod to vibrate the concrete;

[0051] Fourth hopper discharging: Discharge from the right end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the advancing speed to be 0.055 - 0.065 m / s, and uniformly distribute the material within the range of L - L 3 , while continuing to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, and use the inserted vibrating rod to vibrate the concrete;

[0052] Fifth hopper discharging: Discharge from the left end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the advancing speed to be 0.011 - 0.013 m / s, and uniformly distribute the material within the range of 0 - L 4 , L 4 is L / 2, while continuing to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, and use the inserted vibrating rod to vibrate the concrete;

[0053] Sixth hopper discharging: Discharge from the right end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m 3 / s and the advancing speed to be 0.011 - 0.013 m / s, and uniformly distribute the material within the range of L - L 4 , while continuing to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, and use the inserted vibrating rod to vibrate the concrete;

[0054] Repeat the steps of the fifth hopper discharging and the sixth hopper discharging until the casting of the T-beam rib plate is completed;

[0055] S3. Cast the top plate of the T-beam: When casting the top plate of the T-beam, use an inserted vibrating rod to vibrate the concrete, and the vibration sequence is from one end to the other end in turn.

[0056] In step S2, during the pouring of the T-beam rib slab, the internal vibrator is inserted section by section for vibration. The spacing of each section is preferably 28 - 35 cm, that is, starting from the position where the material is initially discharged, the vibrator is inserted for a certain period of time for vibration, and then at intervals of 28 - 35 cm, the vibrator is inserted for a certain period of time for vibration until all the areas with newly poured concrete are vibrated. The spacing of this vibration is more preferably 30 cm. The range of vibration by the internal vibrator is the length part of the formwork covered by the newly poured concrete. For example, if the part covered by the newly added concrete is at the position of the 0 - 7 m length of the formwork, then within the 0 - 7 m length range, the internal vibrator is used for vibration, and it is inserted into the concrete to a depth of about 18 - 22 cm, usually vibrating at the position in the middle of the width.

[0057] Furthermore, in step S2, when pouring the T-beam rib slab, the time for each activation of the surface vibrator is preferably 11 - 15 s, and the surface vibrator is turned off after the vibration requirements are met. The time for this vibration activation is more preferably 12 s.

[0058] Furthermore, in step S3, during the pouring of the top slab, the internal vibrator is inserted section by section for vibration, and the spacing of each section is preferably 38 - 45 cm. The spacing of this vibration is more preferably 40 cm.

[0059] Furthermore, in step S2, each hopper discharges 1.6 - 2.0 m 3 of concrete, preferably 1.8 m 3 of concrete.

[0060] Furthermore, in step S2, for the control of concrete discharging, during the process from the first hopper discharge to the fourth hopper discharge, the concrete flow rate is controlled at 0.017 m 3 / s and the forward speed is 0.06 m / s. During the process from the fifth hopper discharge to the sixth hopper discharge, the concrete flow rate is controlled at 0.017 m 3 / s and the forward speed is 0.12 m / s.

[0061] Combined with Figure 1-6 as shown, taking the T-beam length of 30 m as an example, two rows of surface vibrators are respectively arranged on both sides of the formwork. There are 15 surface vibrators in the upper row and 14 surface vibrators in the lower row. In the figure, ① - represents the serial number of the surface vibrator in the lower row; in the T-beam length direction, it is located in the middle of two upper surface vibrators.

[0062] S1. Select the slump of the concrete at the prestressed duct part to be controlled at 180 - 200 cm, and perform manual placing of the concrete;

[0063] S2. Pour the T-beam rib slab:

[0064] The length of the T-beam is denoted as L;

[0065] The first batch of discharging: Discharge from the left end of the T-beam, and the discharged amount of concrete is 1.8 m 3 of concrete, control the flow rate of concrete to be 0.017 m 3 / s, the advancing speed is 0.06 m / s, uniformly distribute the concrete within the range of 0 - 7 m, and at the same time turn on the surface vibrator that can vibrate the concrete inside the formwork, vibrate for 12 s, and use the internal vibrator to vibrate the concrete. When inserting the internal vibrator, insert it section by section, and the spacing of each section is 30 cm. As Figure 1 shown, the concrete flows to 7 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 0 - 7 m. In addition, according to the vibration range of the surface vibrator, start the surface vibrators No. ②, ④, and ⑥, and temporarily do not turn on the surface vibrators in the upper row;

[0066] The second batch of discharging: Start discharging from the position 7 m from the left end of the T-beam, and the discharged amount of concrete is 1.8 m 3 of concrete, control the flow rate of concrete to be 0.017 m 3 / s, the advancing speed is 0.06 m / s, uniformly distribute the concrete within the range of 7 - 14 m, and at the same time turn on the surface vibrator that can vibrate the concrete inside the formwork, vibrate for 12 s, and insert the internal vibrator to vibrate the concrete. When inserting the internal vibrator, insert it section by section, and the spacing of each section is 30 cm. As Figure 2 shown, the concrete flows to 3 - 16 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 3 - 16 m. In addition, according to the vibration range of the surface vibrator, start the surface vibrators No. ④, ⑥, ⑧, ⑩, and temporarily do not turn on the surface vibrators in the upper row;

[0067] The third batch of discharging: Start discharging from the position 14 m from the left end of the T-beam, and the discharged amount of concrete is 1.8 m 3 of concrete, control the flow rate of concrete to be 0.017 m 3 / s, the advancing speed is 0.06 m / s, uniformly distribute the concrete within the range of 14 - 21 m, and at the same time continue to turn on the surface vibrator that can vibrate the newly poured concrete inside the formwork, vibrate for 12 s, and insert the internal vibrator to vibrate the concrete. When inserting the internal vibrator, insert it section by section, and the spacing of each section is 30 cm. As Figure 3 shown, the concrete flows to 12 - 26 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 12 - 26 m. In addition, according to the vibration range of the surface vibrator, start the surface vibrator, and temporarily do not turn on the surface vibrators in the upper row;

[0068] The fourth batch of discharging: Discharge from the right end of the T-beam, and the discharged amount of concrete is 1.8 m3 of concrete, control the concrete flow rate to be 0.017 m 3 / s and the forward speed to be 0.06 m / s, evenly distribute the material within the range of 30 - 21 m. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork, vibrate for 12 s, and insert the vibrating rod to vibrate the concrete. When inserting the vibrating rod, insert it section by section, and the distance between each section is 30 cm. As Figure 4 shown, the concrete flows to the position of 23 - 30 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 23 - 30 m. In addition, according to the vibration range of the surface vibrator, start No. surface vibrator, and temporarily do not turn on the surface vibrator in the upper row;

[0069] Fifth hopper discharging: Discharge from the left end of the T-beam, and the discharge amount is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s and the forward speed to be 0.012 m / s, evenly distribute the material within the range of 0 - 15 m. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork, and insert the vibrating rod to vibrate the concrete. When inserting the vibrating rod, insert it section by section, and the distance between each section is 30 cm. As Figure 5 shown, the concrete flows to the position of 0 - 16.5 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 0 - 16.5 m. In addition, according to the vibration range of the surface vibrator, start No. ②, ④, ⑥, ⑧, ⑩, No. surface vibrator, and temporarily do not turn on the surface vibrator in the upper row;

[0070] Sixth hopper discharging: Discharge from the right end of the T-beam, and the discharge amount is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s and the forward speed to be 0.012 m / s, evenly distribute the material within the range of 30 - 15 m. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork, and insert the vibrating rod to vibrate the concrete. When inserting the vibrating rod, insert it section by section, and the distance between each section is 30 cm. As Figure 6 shown, the concrete flows to the position of 13 - 30 m, and the internal vibrator vibrates the concrete within the range of the formwork length of 13 - 30 m. In addition, according to the vibration range of the surface vibrator, start No. surface vibrator, and temporarily do not turn on the surface vibrator in the upper row;

[0071] Repeat the steps of discharging from the fifth hopper and the sixth hopper until the casting of the T-beam rib slab is completed. At the same time, note that during the discharging process, start the external vibrators that can vibrate the newly poured concrete, rather than the external vibrators at the specific positions during the discharging from the fifth hopper and the sixth hopper. When the external vibrators in the upper row can vibrate the newly poured concrete, start the corresponding external vibrators in the upper row; similarly, the internal vibrator also vibrates the part within the length range of the newly poured concrete.

[0072] S3. Cast the T-beam top slab: When casting the T-beam top slab, use an internal vibrator to vibrate the concrete. When inserting the vibrator, insert it section by section, and the spacing of each section is 40 cm.

[0073] After the casting and curing are completed, as Figure 7 shown, there is no bleeding, segregation phenomenon, nor peeling phenomenon in the precast T-beam, and there are no honeycombs or pockmarks on the surface, and no bubbles are generated inside.

[0074] Comparative Example 1

[0075] Taking the T-beam with a length of 30 m as an example, two rows of external vibrators are respectively arranged on both sides of the formwork. There are 15 external vibrators in the upper row and 14 external vibrators in the lower row. In the figure, ①- represents the number of the external vibrator, and the external vibrator in the lower row; in the length direction of the T-beam, it is located in the middle of the two external vibrators in the upper row.

[0076] S1. Select the slump of the concrete at the prestressed duct part to be controlled at 180 - 200 cm, and perform manual placing of the concrete.

[0077] S2. Cast the T-beam rib slab:

[0078] The length of the T-beam is represented by L;

[0079] The first hopper discharging: Discharge the concrete from the left end of the T-beam, and the discharge amount is 1.8 m 3 of concrete. Control the concrete flow rate at 0.017 m 3 / s and the advancing speed at 0.06 m / s, and evenly place the concrete within the range of 0 - 7 m. By manually knocking on both sides of the formwork, judge the position of the concrete, and then start the external vibrator that can vibrate the concrete in the formwork, vibrate for 12 s, and use an internal vibrator to vibrate the concrete. When inserting the vibrator, insert it section by section, and the spacing of each section is 30 cm;

[0080] The second hopper discharging: Start discharging from the position 7 m from the left end of the T-beam, and the discharge amount is 1.8 m 3 of concrete. Control the concrete flow rate at 0.017 m 3 / s, the forward speed is 0.06 m / s, and the concrete is evenly distributed within the range of 7 - 14 m. By manually tapping both sides of the formwork, the position of the concrete is judged, and then the internal vibrator that can vibrate the concrete poured into the formwork is turned on for 12 s, and a vibrating rod is inserted to vibrate the concrete. When inserting the vibrating rod, it is inserted section by section, and the spacing of each section is 30 cm;

[0081] The third hopper discharging: Start discharging from the position 14 m from the left end of the T-beam, and the discharging volume is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s, the forward speed is 0.06 m / s, and the concrete is evenly distributed within the range of 14 - 21 m. By manually tapping both sides of the formwork, the position of the concrete is judged, and then continue to turn on the internal vibrator that can vibrate the newly poured concrete into the formwork for 12 s, and insert a vibrating rod to vibrate the concrete. When inserting the vibrating rod, it is inserted section by section, and the spacing of each section is 30 cm;

[0082] The fourth hopper discharging: Discharge from the right end of the T-beam, and the discharging volume is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s, the forward speed is 0.06 m / s, and the concrete is evenly distributed within the range of 30 - 21 m. By manually tapping both sides of the formwork, the position of the concrete is judged, and then continue to turn on the internal vibrator that can vibrate the newly poured concrete into the formwork for 12 s, and insert a vibrating rod to vibrate the concrete. When inserting the vibrating rod, it is inserted section by section, and the spacing of each section is 30 cm;

[0083] The fifth hopper discharging: Discharge from the left end of the T-beam, and the discharging volume is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s, the forward speed is 0.012 m / s, and the concrete is evenly distributed within the range of 0 - 15 m. By manually tapping both sides of the formwork, the position of the concrete is judged, and then continue to turn on the internal vibrator that can vibrate the newly poured concrete into the formwork, and insert a vibrating rod to vibrate the concrete. When inserting the vibrating rod, it is inserted section by section, and the spacing of each section is 30 cm;

[0084] The sixth hopper discharging: Discharge from the right end of the T-beam, and the discharging volume is 1.8 m 3 of concrete, control the concrete flow rate to be 0.017 m 3 / s, the forward speed is 0.012 m / s, and the concrete is evenly distributed within the range of 30 - 15 m. By manually tapping both sides of the formwork, the position of the concrete is judged, and then continue to turn on the internal vibrator that can vibrate the newly poured concrete into the formwork, and insert a vibrating rod to vibrate the concrete. When inserting the vibrating rod, it is inserted section by section, and the spacing of each section is 30 cm;

[0085] Repeat the steps of discharging materials from the fifth hopper and the sixth hopper until the casting of the T-beam rib slab is completed. At the same time, note that during the discharging process, start the external vibrators that can vibrate the newly poured concrete, rather than the external vibrators at the specific positions during the discharging of the above-mentioned fifth hopper and sixth hopper. When the external vibrators in the upper row can vibrate the newly poured concrete, start the corresponding external vibrators in the upper row. Similarly, the internal vibrator also vibrates the part within the length range of the newly poured concrete, but the position of the newly poured concrete is judged by manually knocking on the formwork.

[0086] S3. Cast the T-beam top slab: When casting the T-beam top slab, use an internal vibrator to vibrate the concrete. When inserting the vibrator, insert it section by section, and the spacing of each section is 40 cm.

[0087] After the casting and curing are completed, as Figure 7 shown, there is no bleeding, segregation, peeling phenomenon in the precast T-beam, nor honeycombing and pitting on the surface, and no bubbles are generated inside.

[0088] After the casting and curing are completed, as Figure 8 shown, there are obvious honeycombing and pitting on the surface of the precast T-beam, and there are also some small bubbles inside.

Claims

1. A vibrating method during the pouring process of precast T - beams, characterized in that it includes: At least two rows of surface vibrators are respectively arranged on both sides of the formwork, and the vibration range of the surface vibrators can ensure that the concrete throughout the length of the beam is vibrated; Conduct a concrete pouring test in the early stage. Combining the concrete slump and the concrete temperature entering the formwork, statistically analyze the shape diagram of the concrete in the formwork during the pouring process. According to the shape of the concrete in the formwork after each batching, start the surface vibrators that can vibrate the concrete in the formwork correspondingly. At the same time, use internal vibrators to vibrate the concrete; Observe the appearance quality of the T - beam body after it is formed, and form a matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators; The construction steps based on the matching diagram of the concrete shape considering the concrete slump factor and the starting sequence of the surface vibrators include: S1. Control the concrete slump at the part with prestressed ducts to be 180 - 200 mm, and conduct manual batching; S2. Pour the T - beam rib plate: The length of the T - beam is represented by L; First hopper discharging: Discharge from the left end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m³ / s and the forward speed to be 0.055 - 0.065 m / s, and evenly distribute the concrete within the range of 0 - L 1 , where L 1 is L / 5 - L / 4. At the same time, start the surface vibrator that can vibrate the concrete inside the formwork, and use the internal vibrator to vibrate the concrete; Second hopper discharging: Starting from the left end of the T-beam at a position of L 1 , control the concrete flow rate to be 0.015 - 0.019 m³ / s and the forward speed to be 0.055 - 0.065 m / s, and evenly distribute the concrete within the range of L 1 - L 2 . L 2 is 2L 1 . Meanwhile, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork; Third hopper discharging: Starting from the left end of the T-beam at a position of L 2 , control the concrete flow rate to be 0.015 - 0.019 m³ / s and the advancing speed to be 0.055 - 0.065 m / s, and evenly distribute the concrete within the range of L 2 - L 3 . L 3 is 3L 1 . At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete into the formwork; Fourth hopper discharging: Discharge from the right end of the T-beam, control the concrete flow rate at 0.015 - 0.019 m³ / s and the forward speed at 0.055 - 0.065 m / s, and evenly distribute the concrete within the range of L-L 3 Meanwhile, continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use the internal vibrator to vibrate the concrete; Fifth hopper discharging: Discharge from the left end of the T beam, control the concrete flow rate to be 0.015 - 0.019 m³ / s and the forward speed to be 0.011 - 0.013 m / s, and evenly distribute the concrete within the range of 0 - L 4 , where L 4 is L / 2. At the same time, continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use the internal vibrator to vibrate the concrete; Sixth hopper discharging: Discharge materials from the right end of the T-beam, control the concrete flow rate to be 0.015 - 0.019 m³ / s and the forward speed to be 0.011 - 0.013 m / s, and evenly distribute the concrete within the range of L-L 4 , and at the same time continue to turn on the surface vibrator that can vibrate the newly poured concrete in the formwork, and use the internal vibrator to vibrate the concrete; Repeat the steps of the fifth batching and the sixth batching until the pouring of the T - beam rib plate is completed; S3. Pour the T - beam top plate: When pouring the T - beam top plate, use internal vibrators to vibrate the concrete.

2. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S2, during the process of pouring the T - beam rib plate, the internal vibrator is inserted section by section for vibration, and the spacing of each section is 28 - 35 cm, and the vibration range is the part of the formwork length covered by the newly poured concrete.

3. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S2, when pouring the T - beam rib plate, the surface vibrator is turned on for 11 - 15 s each time.

4. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S3, the internal vibrator is inserted section by section for vibration, and the spacing of each section is 38 - 45 cm.

5. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S2, 1.6 - 2.0 m of concrete is discharged per hopper. 3 of concrete.

6. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S2, during the process from the first batching to the fourth batching, control the concrete flow rate to be 0.017 m³ / s and the forward speed to be 0.06 m / s.

7. The vibrating method during the pouring process of precast T - beams according to claim 1, characterized in that: In step S2, during the process from the fifth batching to the sixth batching, control the concrete flow rate to be 0.017 m³ / s and the forward speed to be 0.012 m / s.

8. The vibrating method during the pouring process of precast T - beams according to claim 1 or 3, characterized in that: In step S2, when pouring the T - beam rib plate, the surface vibrator is turned on for 12 s each time.

9. The vibrating method during the pouring process of precast T - beams according to claim 1 or 2, characterized in that: In step S2, during the process of pouring the T - beam rib plate, the internal vibrator is inserted section by section for vibration, and the spacing of each section is 30 cm.

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