Floating type UHPC concrete box type segment jacking pouring method

Abstract

The invention discloses a floating type UHPC concrete box-type segment jacking pouring method which comprises the steps that before a mold is installed, formwork cloth is pasted to the chamfer of a box-type structure of the mold, the top of a bottom plate and the position of a lower semicircle; the reinforcement cage is integrally bound and formed and hoisted to a bottom die of the die, and a movable end die and an outer side die are sequentially installed and subjected to die assembly operation; the anti-floating inner mold with the balance weight is operated to walk to the specified position of the inner cavity of the box type section, the axis position is adjusted, and the anti-floating inner mold is opened to complete mold installation; checking the sealing performance of the mold; pouring of a bottom plate, two middle webs, arc sections on the two sides and a top plate of the box type section is conducted according to the principle of'left-right symmetry and horizontal layering from the middle to the two ends', and in the pouring process, a vibrator is adopted to be matched with a vibrating rod to vibrate concrete; and plastering and finishing the top plate after the vibration is completed. Concrete pouring of the web and the top plate can be smoothly completed, and the quality of the concrete is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of floating wind turbine generator set foundations, and in particular to a floating UHPC concrete box-type segment jacking and casting method. Background Art

[0002] The ultra-high performance UHPC concrete box segment of the floating wind turbine foundation is the structural unit of the floating foundation buoy, and its structure is similar to the segmental box girder of the bridge engineering.

[0003] The concrete of the segmental box girder of traditional bridge engineering is poured continuously at one time. First, pour from the webs on both sides, and the concrete flows to the middle of the bottom plate. When the concrete pouring height of the web reaches about 120cm, stop using the attached vibrator for the web concrete and use the inserted vibrator instead, and then fill the web. At this time, the upturned part of the concrete in the bottom plate is enough to level the middle of the bottom plate, vibrate with the inserted vibrator, and smooth it manually. Finally, pour the top plate concrete.

[0004] The ultra-high performance UHPC concrete mixture of the floating wind turbine foundation has excellent fluidity, and the initial setting time is generally more than 10 hours. If the traditional segmental box girder casting process is used, since there is no formwork in the middle of the bottom plate, the concrete in the bottom plate will continue to flip up, and the casting of the web and top plate concrete cannot be completed. In addition, the ultra-high performance UHPC concrete mixture is viscous and bubbles are not easy to discharge, resulting in poor internal density of the concrete and poor appearance quality of the concrete. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a floating UHPC concrete box segment jacking casting method, which can smoothly complete the casting of web and top plate concrete and greatly improve the quality of concrete.

[0006] The purpose of the present invention is achieved through the following technical solutions: A floating UHPC concrete box segment jacking casting method comprises the following steps: Before installing the mold, paste the template cloth on the chamfer of the box structure of the mold, the top of the bottom plate and the lower semi-circular arc; The steel bar skeleton is tied and formed as a whole, and then hoisted onto the bottom mold of the mold, and the mobile end mold and the outer mold are installed in sequence and the mold closing operation is performed; Operate the anti-floating inner mold with counterweight to move to the specified position of the inner cavity of the box-shaped segment, adjust the axis position, and open the anti-floating inner mold to complete the mold installation; Check the tightness of the mold to avoid leakage during pouring; According to the principle of "from the middle to the two ends, symmetrical and horizontally layered", the bottom plate, two middle web plates, arc segments on both sides and top plate of the box-shaped segment are poured. During the pouring process, a vibrator and a vibrating rod are used to vibrate the concrete. After the vibration is completed, the top plate is plastered and finished.

[0007] Furthermore, the steel skeleton is integrally tied and formed, and hoisted onto the bottom mold of the mold, and the movable end mold and the outer mold are installed in sequence and the mold closing operation is performed, specifically including: the steel skeleton is integrally tied and formed, and hoisted onto the bottom mold of the mold, the movable end mold is installed, and the prestressed corrugated pipe is fixed to the movable end mold and the steel skeleton, the outer mold is installed, and the installed outer mold and the movable end mold are closed.

[0008] Furthermore, according to the principle of "from the middle to the two ends, symmetrical and horizontally layered", the bottom plate, two middle web plates, arc segments on both sides and the top plate of the box-shaped segment are cast, including: Use a concrete pump to pump concrete into the pouring point on the top of one of the middle web plates, and continuously feed the material into the mold. When concrete is observed to flow out from the top of the other middle web plate and pass the armpit corner, start pouring the second middle web plate. After the concrete is leveled at the two middle web plates, the bottom plate pouring is completed. Then the two middle web plates are alternately and evenly poured to the top, the arc sections on both sides are poured to the top, and finally the top plate is poured.

[0009] Furthermore, a plurality of pouring points are respectively arranged on the top of the middle web, and inclined plates for reducing the impact force of pumping materials are arranged at the pouring points.

[0010] Furthermore, the duration of a single pouring surface during the alternating pouring process does not exceed 20 minutes, and a layer of concrete is sprayed on the pouring surfaces of the two middle webs while alternating.

[0011] Furthermore, the material is poured and vibrated in layers, with the thickness of each layer not exceeding the height of the vibrator spacing. The pouring time of the upper and lower layers shall not exceed 20 minutes. During the pause process of alternating pouring of the upper and lower layers, the atomizer shall be turned on to keep the moisture in order to avoid crusting on the concrete surface.

[0012] Furthermore, during the pouring process, a vibrator is used in combination with a vibrating rod to vibrate the concrete, specifically including: using an attached high-frequency vibrator in combination with a vibrating rod to vibrate the concrete pouring of the bottom plate and the arc sections on both sides, using an attached high-frequency vibrator and a vibrating rod to vibrate the middle web plate, and finally using an inserted vibrating rod to vibrate the top plate.

[0013] Furthermore, when using a vibrating rod to vibrate, the distance between the vibration points is 30 cm to 40 cm, the depth of each point inserted into the lower layer of concrete is 5 cm to 10 cm, and the continuous vibration time of the vibration point is 20s to 25s.

[0014] Furthermore, an attached high-frequency vibrator is used to vibrate horizontally in different areas. The rising position of concrete pouring is determined according to the sound of knocking on the formwork. Multiple attached high-frequency vibrators are started at the same time. Vibration is started after the concrete covers and rises to the attached high-frequency vibrator position. The vibration time is 5s to 15s, and the vibration is performed 1 to 2 times. Secondly, when the descending speed slows down during the pouring of the middle web, the attached high-frequency vibrator at the corresponding position is turned on to accelerate the sinking of the concrete. When the concrete is poured to the horizontal line of the center of the arc segment, another round of horizontal layered vibration is carried out in different areas. When the entire concrete is poured, all attached high-frequency vibrators are vibrated horizontally in different areas in different layers.

[0015] Furthermore, after the vibration is completed, the top plate is subjected to plastering and finishing operations, which specifically include: The top plate is plastered with an electric plastering and putty knife. In order to prevent the concrete from crusting too quickly, water mist is sprayed on the surface of the crust. After the concrete plastering is completed, wait for 1h to 1.5h for the second finishing. After completion, cover with a film and enter the subsequent concrete curing process.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention adopts a jacking casting method, and the concrete in the bottom plate will not be turned up, and the casting of the web plate and the top plate concrete can be completed smoothly.

[0017] 2. The present invention can greatly improve the appearance quality of concrete by pasting template cloth on the mold position where bubbles are easily accumulated in the mold box structure.

[0018] 3. The present invention adopts a jacking casting method, the internal density of the concrete is better, and the construction quality is better than the traditional casting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of the method.

[0020] Figure 2 It is a schematic diagram of pouring concrete in the present invention in a horizontally layered manner from the middle to both ends in a symmetrical manner.

[0021] Figure 3 It is a sequence diagram of using a vibrator for vibration in the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, this embodiment provides a floating UHPC concrete box segment jacking casting method, characterized in that it includes the steps of: S1. Before installing the mold, in order to improve the appearance quality of the concrete, paste the template cloth on the chamfers of the box structure of the mold, the top of the bottom plate and the lower semi-circular arc where bubbles are easily gathered; S2. Tie the steel bar skeleton as a whole and hoist it onto the bottom mold of the mold. Install the mobile end mold and the outer mold in turn and perform mold closing operations. Specifically: The steel frame is integrally tied and formed, and hoisted onto the bottom mold of the mold, the mobile end mold is installed, and the prestressed corrugated pipe is fixed to the mobile end mold and the steel frame, the outer mold is installed, and the installed outer mold and the mobile end mold are molded together; S3. Operate the anti-floating inner mold with a counterweight to move to the specified position of the inner cavity of the box-shaped segment, adjust the axis position, and open the anti-floating inner mold to complete the mold installation; S4. Check the tightness of the mold to ensure its tightness to avoid leakage during the pouring process, which may cause the pouring to fail to be completed smoothly; S5. According to the principle of "from the middle to the two ends, symmetrical and horizontally layered", the bottom plate, two middle web plates, arc segments on both sides and the top plate of the box-shaped segment are poured. During the pouring process, a vibrator and a vibrating rod are used to vibrate the concrete; specifically: Four pouring points are respectively set on the top of the two middle webs of the mold, and inclined plates are set at the pouring points. The concrete is pumped into one of the middle webs by a concrete pump. The concrete enters the mold after being buffered by the inclined plate. When concrete is observed to flow out and pass through the armpit corner from the top (or bottom observation hole) of the other middle web (or judged by the sound and color of knocking on the template cloth), the pouring of the second middle web is started. After the concrete is level with the two middle webs, the pouring of the bottom plate is completed. Then the two middle webs are poured evenly to the top in an alternating cycle, and the arc sections on both sides are poured to the top, and finally the top plate is poured.

[0024] In addition, to avoid the vertical cracks caused by the settlement of concrete at the junction of the middle plate and the top plate, it is advisable to pause for a while after the middle plate is poured to allow the concrete of the middle plate to fully settle before pouring the top plate. However, it is necessary to ensure that the top plate concrete is poured before the initial setting of the middle plate concrete, and to level and finish the surface in time.

[0025] The specific pouring sequence is as follows: Figure 2 As shown in the figure, from ①→② / ③→④ / ⑤→⑥, in order to avoid cold joints, the duration of a single pouring surface during the alternating pouring process shall not exceed 20 minutes, and a layer of concrete shall be sprayed on the pouring surface of the two middle webs during the alternation. Layered material feeding and vibration shall be performed, and the thickness of each layer shall not exceed the height of the vibrator spacing. The pouring time of the upper and lower layers shall not exceed 20 minutes. During the pause process of the alternating pouring of the upper and lower layers, the atomizer shall be turned on to keep the moisture to avoid crusting on the concrete surface.

[0026] During the pouring process, an attached high-frequency vibrator is used in conjunction with a vibrating rod to vibrate the concrete pouring of the bottom plate and the arc sections on both sides. An attached high-frequency vibrator and a vibrating rod are used to vibrate the middle web plate. Finally, a 50-type inserted vibrating rod is used to vibrate the top plate.

[0027] The sign of compaction of concrete is that the concrete stops sinking, does not bubble, does not overflow, and has a flat surface. When using a vibrating rod to vibrate, pay attention to inserting it quickly and pulling it out slowly. The vibration points should be arranged reasonably, with a spacing of 30 cm to 40 cm between the vibration points, and each point inserted into the lower layer of concrete to a depth of 5 cm to 10 cm. The continuous vibration time of the vibration point should be strictly controlled between 20 and 25 seconds. The vibration should be carried out strictly in the order of laying materials, and no under-vibration or over-vibration is allowed.

[0028] When vibrating, use an attached high-frequency vibrator to vibrate horizontally in different areas and layers. The vibrating sequence of the vibrator is as follows: Figure 3 As shown, the vibration sequence is 1, vibration sequence 2 ... vibration sequence 21. The rising position of concrete pouring is determined according to the sound of knocking on the formwork. Three or six attached high-frequency vibrators are started at the same time. The vibration is started after the concrete covers and rises to the position of the vibrator. The vibration time is 5 s to 15 s, and the vibration is 1 to 2 times. Secondly, when the descending speed slows down during the pouring of the middle web, the attached high-frequency vibrator at the corresponding position is turned on to accelerate the sinking of the concrete. In addition, when the concrete is poured to the horizontal line position of the center of the arc segment, another round of regional horizontal layered vibration is carried out. When the entire concrete is poured, all attached high-frequency vibrators are vibrated in different regions and layers. Each segment should be poured as a whole at one time, and cannot be poured in batches, and the vibration should be dense.

[0029] S6. After the vibration is completed, the top plate is plastered and finished.

[0030] After the vibration is completed, the top plate is plastered. Electric plastering machines are used for large areas, and putty knives are used for corners for small areas. The first finishing is to make the surface smooth. Be careful not to drop concrete slag into the finished concrete surface. The atomization equipment is turned on intermittently during the process to prevent the concrete from crusting too quickly. A small amount of water mist can be sprayed on the surface of some crusts, subject to the surface being wet, and large water drops should be prevented from entering. After the sprayer is turned off, the nozzle will drip, and it is necessary to leave the concrete surface immediately. After the concrete surface is finished, wait for 1h to 1.5h for the second finishing. After completion, cover with a film and enter the subsequent concrete curing process.

[0031] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A floating UHPC concrete box segment jacking casting method, characterized in that: Including steps, Before installing the mold, paste the template cloth on the chamfer of the box structure of the mold, the top of the bottom plate and the lower semi-circular arc; The steel bar skeleton is tied and formed as a whole, and then hoisted onto the bottom mold of the mold, and the mobile end mold and the outer mold are installed in sequence and the mold closing operation is performed; Operate the anti-floating inner mold with counterweight to move to the specified position of the inner cavity of the box-shaped segment, adjust the axis position, and open the anti-floating inner mold to complete the mold installation; Check the tightness of the mold to avoid leakage during pouring; According to the principle of "from the middle to the two ends, symmetrical and horizontally layered", the bottom plate, two middle web plates, arc segments on both sides and top plate of the box-shaped segment are poured. During the pouring process, a vibrator and a vibrating rod are used to vibrate the concrete. After the vibration is completed, the top plate is plastered and finished.

2. The floating UHPC concrete box segment jacking casting method according to claim 1 is characterized in that: The steel skeleton is integrally tied and formed, and hoisted onto the bottom mold of the mold, and the mobile end mold and the outer mold are installed in sequence and the mold closing operation is performed, which specifically includes: the steel skeleton is integrally tied and formed, and hoisted onto the bottom mold of the mold, the mobile end mold is installed, and the prestressed corrugated pipe is fixed to the mobile end mold and the steel skeleton, the outer mold is installed, and the installed outer mold and the mobile end mold are closed.

3. The floating UHPC concrete box segment jacking casting method according to claim 1 is characterized in that: The bottom plate, two middle web plates, arc segments on both sides and top plate of the box-shaped segment are cast according to the principle of "from the middle to both ends, symmetrical on both sides, and horizontal layering", which includes: Use a concrete pump to pump concrete into the pouring point on the top of one of the middle web plates, and continuously feed the material into the mold. When concrete is observed to flow out from the top of the other middle web plate and pass the armpit corner, start pouring the second middle web plate. After the concrete is leveled at the two middle web plates, the bottom plate pouring is completed. Then the two middle web plates are alternately and evenly poured to the top, the arc sections on both sides are poured to the top, and finally the top plate is poured.

4. The floating UHPC concrete box segment jacking casting method according to claim 3 is characterized in that: A plurality of pouring points are respectively arranged on the top of the middle web, and inclined plates for reducing the impact force of pumping materials are arranged at the pouring points.

5. The floating UHPC concrete box segment jacking casting method according to claim 3 is characterized in that: The duration of a single pouring surface during the alternating pouring process shall not exceed 20 minutes, and a layer of concrete shall be sprayed on the pouring surfaces of the two middle web plates while alternating.

6. The floating UHPC concrete box segment jacking casting method according to claim 3 is characterized in that: The material should be poured and vibrated in layers. The thickness of each layer should not exceed the height of the distance between the vibrators. The pouring time of the upper and lower layers should not exceed 20 minutes. During the pause process of alternating pouring of the upper and lower layers, the atomizer should be turned on to keep moisture in order to avoid crusting on the concrete surface.

7. The floating UHPC concrete box segment jacking casting method according to claim 1 is characterized in that: During the pouring process, a vibrator is used in combination with a vibrating rod to vibrate the concrete, specifically including: using an attached high-frequency vibrator in combination with a vibrating rod to vibrate the concrete pouring of the bottom plate and the arc sections on both sides, using an attached high-frequency vibrator and a vibrating rod to vibrate the middle web plate, and finally using an inserted vibrating rod to vibrate the top plate.

8. The floating UHPC concrete box segment jacking casting method according to claim 7 is characterized in that: When using a vibrating rod to vibrate, the distance between the vibration points is 30 cm to 40 cm, the depth of each point inserted into the lower layer of concrete is 5 cm to 10 cm, and the continuous vibration time of the vibration point is 20s to 25s.

9. The floating UHPC concrete box segment jacking casting method according to claim 7, characterized in that: Use attached high-frequency vibrators to vibrate horizontally in different areas. Determine the rising position of concrete pouring based on the sound of knocking on the formwork. Start multiple attached high-frequency vibrators at the same time. Start vibrating after the concrete covers and rises to the attached high-frequency vibrator position. The vibration time is 5s to 15s, and the vibration is 1 to 2 times. Secondly, when the descending speed slows down during the pouring of the middle web, turn on the attached high-frequency vibrator at the corresponding position to accelerate the sinking of the concrete. When the concrete is poured to the horizontal line of the center of the arc segment, carry out another round of horizontal layered vibration in different areas. When the entire concrete is poured, all attached high-frequency vibrators are vibrated horizontally in different areas and layers.

10. The floating UHPC concrete box segment jacking casting method according to claim 1, characterized in that: After the vibration is completed, the top plate is subjected to plastering and finishing operations, which specifically include: The top plate is plastered with an electric plastering and putty knife. In order to prevent the concrete from crusting too quickly, water mist is sprayed on the surface of the crust. After the concrete plastering is completed, wait for 1h to 1.5h for the second finishing. After completion, cover with a film and enter the subsequent concrete curing process.

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