Method and device for cast-in-place concrete pouring and vibrating of side wall of laminated assembly type subway station

Abstract

The invention discloses an on-site concrete pouring and vibrating method and device for a side wall of a laminated assembly type subway station, and the method comprises the steps: fixing a limiting sleeve on a bottom plate of the side wall in advance; a transmission rod is mounted on the limiting sleeve, so that the transmission rod is embedded into the limiting sleeve, and the transmission rod upwards extends out of the side wall from the limiting sleeve; the transmission rod and the vibrator are assembled together, so that the vibrator is in driving connection with the transmission rod; and side wall concrete is poured, the vibrator is started, the vibrator drives the transmission rod to vibrate so as to transmit vibration to the side wall concrete, the transmission rod and the side wall concrete form an integrated structure, and therefore integrated pouring of the side wall concrete is achieved. The problem that concrete at the bottom of the side wall is not fully vibrated is solved, layered pouring construction joints are eliminated, the structural strength of the side wall is enhanced, the construction efficiency is improved, and the construction method is suitable for construction of side walls of various overlapped assembly type subway stations.

Description

Technical Field

[0001] This application relates to the field of municipal construction technology, and more specifically, to a method and apparatus for in-situ concrete pouring and vibration compaction of composite prefabricated subway station side walls. Background Technology

[0002] As a core technology direction for the industrialized construction of rail transit, prefabricated composite subway stations effectively solve the problems of long construction periods and excessive wet work in traditional cast-in-place stations by adopting the model of "factory prefabrication of composite components + on-site assembly and post-casting". Among them, the side walls, as the main load-bearing structure of the subway station, directly determine the structure's impermeability, seismic resistance and overall load-bearing capacity by the density of the cast-in-place concrete.

[0003] In current construction, the height of precast components for the side walls of composite prefabricated subway stations is too large. When using traditional immersion vibrators for concrete vibration, there are two major problems: First, the effective vibration length of the vibrator is limited, and it cannot reach the bottom area of ​​the side wall, resulting in insufficient vibration of the bottom concrete, which easily leaves air bubbles, forming honeycomb and pitted surfaces, and reducing structural strength. Second, in order to solve the problem of vibration blind spots, construction units often adopt the "3-5m layered pouring + layered vibration" process. This method will form multiple construction joints inside the side wall, which not only damages the integrity of the structure, but also easily becomes a hidden danger of leakage, seriously affecting the service life of the station.

[0004] In existing technologies, some improvement solutions attempt to solve the problem by extending the vibrator or setting up a simple vibration transmission rod. However, extending the vibrator leads to insufficient rigidity, severe vibration attenuation, and low vibration transmission efficiency. Simple vibration transmission rods have a small contact area with the concrete, resulting in uneven vibration transmission. Furthermore, they need to be removed from the concrete after vibration, which increases construction steps and easily disturbs the already poured concrete. Therefore, there is an urgent need for a vibration device that can achieve integrated casting of side walls, thorough vibration of the bottom, and enhanced structural strength.

[0005] Therefore, existing technologies need to be improved. Summary of the Invention

[0006] The purpose of this application is to provide a method and device for vibrating and compacting cast-in-place concrete for the side walls of composite prefabricated subway stations, aiming to solve the technical problems of insufficient vibration of cast-in-place concrete and construction joints in layered casting of side walls of composite prefabricated stations in the prior art.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides a method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station, which includes the following steps: The limiting sleeve is pre-fixed to the bottom plate of the side wall; A transmission rod is installed on the limiting sleeve to embed the transmission rod into the limiting sleeve and to extend the transmission rod upward from the limiting sleeve to the outside of the side wall; The drive rod is assembled with the vibrator so that the vibrator is driven to connect with the drive rod. The side wall concrete is poured, and the vibrator is started. The vibrator drives the transmission rod to vibrate, so as to transmit the vibration to the side wall concrete and make the transmission rod and the side wall concrete form an integral structure, so as to realize the integral pouring of the side wall concrete.

[0008] In one embodiment, the step of pre-fixing the limiting sleeve to the base plate of the side wall includes: The limiting sleeve is fixed at a designated position on the base plate; Pour the base slab concrete to fix the limiting sleeve to the base slab concrete.

[0009] In one embodiment, after the step of pouring the base slab concrete to fix the limiting sleeve to the base slab concrete, the method further includes: Precast components for the side walls of the prefabricated subway station are assembled on one side of the concrete base slab. Formwork is erected in the foundation pit on the side of the base slab concrete away from the prefabricated subway station to form a cast-in-place area for the side walls in the foundation pit; The reinforcing steel frame is tied according to the design within the cast-in-place area of ​​the side wall.

[0010] In one embodiment, prior to the step of mounting the transmission rod on the limiting sleeve, embedding the transmission rod into the limiting sleeve, and extending the transmission rod upward from the limiting sleeve to the outside of the side wall, the method further includes: Prepare the materials for manufacturing the transmission rod, including main reinforcement bars, several branch reinforcement bars, connecting plates, and connecting sleeves; An embedding portion for embedding the limiting sleeve is reserved at the end of the main rib; Multiple layers of branch steel bars are welded to the side of the main reinforcement bar away from the embedded part, so that multiple branch steel bars are evenly distributed radially on the main reinforcement bar, and the branch steel bars between layers are staggered. The connecting plate is welded to the first end of the main reinforcement, and the connecting sleeve is welded to the side of the connecting plate away from the main reinforcement. The connecting sleeve is used to connect to the vibrator rod of the vibrator.

[0011] In one embodiment, in the step of welding multiple layers of branch reinforcement bars on the side of the main reinforcement bar away from the embedded part, such that multiple branch reinforcement bars are radially evenly distributed on the main reinforcement bar and the branch reinforcement bars are staggered between layers, the included angle between multiple branch reinforcement bars in a single layer is 120°, the downward inclination angle between the branch reinforcement bars and the main reinforcement bar is 45°, and the spacing between the branch reinforcement bars between layers is 0.3-0.8m.

[0012] In one embodiment, the step of mounting a transmission rod on the limiting sleeve to embed the transmission rod into the limiting sleeve and extend the transmission rod upward from the limiting sleeve to the outside of the side wall includes: The transmission rod is hoisted above the limiting sleeve, and then the embedding part is embedded into the limiting sleeve to complete the initial positioning of the transmission rod. A clamp is installed on the side of the main reinforcement bar near the connecting plate, so that the clamp wraps around the main reinforcement bar and fixes the clamp to the steel reinforcement skeleton in the foundation pit.

[0013] In one embodiment, in the step of installing a clamp on the side of the main reinforcement bar near the connecting plate, such that the clamp wraps around the main reinforcement bar, and fixing the clamp to the steel reinforcement skeleton in the foundation pit, the inner diameter of the clamp and the inner diameter of the limiting sleeve are both larger than the outer diameter of the main reinforcement bar, so as to provide room for movement of the transmission rod when it vibrates.

[0014] In one embodiment, in the step of hoisting the transmission rod above the limiting sleeve and then embedding the embedding part into the limiting sleeve to complete the initial positioning of the transmission rod, the inner depth of the limiting sleeve is not less than 0.5m to prevent the transmission rod from sliding out of the sleeve.

[0015] To achieve the above objectives, this application also provides a concrete pouring vibration device for composite prefabricated subway station sidewalls based on the above-described concrete pouring vibration method for composite prefabricated subway station sidewalls, comprising: A limiting sleeve, which is pre-installed on the bottom plate of the side wall; A transmission rod is embedded in the limiting sleeve and extends upward from the limiting sleeve to the outside of the side wall; A vibrator is connected to the side of the drive rod away from the limiting sleeve. The vibrator is used to drive the drive rod to vibrate so as to transmit the vibration to the side wall concrete and make the drive rod and the side wall concrete form an integral structure.

[0016] In one embodiment, the transmission rod includes a main reinforcement bar, a plurality of branch reinforcement bars, a connecting plate, and a connecting sleeve. The end of the main reinforcement bar is provided with an embedding part for embedding into the limiting sleeve. Multiple layers of branch reinforcement bars are provided on the side of the main reinforcement bar away from the embedding part, so that multiple branch reinforcement bars are radially evenly distributed on the main reinforcement bar, and the branch reinforcement bars between layers are staggered. The beginning end of the main reinforcement bar is provided with the connecting plate, and the connecting sleeve is provided on the side of the connecting plate away from the main reinforcement bar. The connecting sleeve is used to connect to the vibrating rod of the vibrator. The device further includes: The clamp is fixed to the steel reinforcement skeleton inside the foundation pit and is used to wrap around the side of the main reinforcement near the connecting plate.

[0017] The beneficial effects of the concrete pouring and vibration method and device for composite prefabricated subway station side walls provided in this application are at least as follows: This application discloses a method and apparatus for vibrating and compacting cast-in-place concrete for the side walls of composite prefabricated subway stations. The method includes: pre-fixing a limiting sleeve to the bottom plate of the side wall; installing a transmission rod on the limiting sleeve, embedding the transmission rod into the limiting sleeve, and extending the transmission rod upwards from the limiting sleeve to the outside of the side wall; assembling the transmission rod with a vibrator to drive the vibrator to the transmission rod; pouring the side wall concrete and starting the vibrator, which drives the transmission rod to vibrate, transmitting the vibration to the side wall concrete and forming an integral structure between the transmission rod and the side wall concrete, thus achieving integral casting of the side wall concrete. This application solves the problem of insufficient vibration of the concrete at the bottom of the side wall, eliminates construction joints in layered pouring, enhances the structural strength of the side wall, improves construction efficiency, and is applicable to the construction of side walls for various types of composite prefabricated subway stations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of the concrete pouring and vibration process for the side wall of a composite prefabricated subway station provided in this application embodiment; Figure 2 A flowchart illustrating the manufacturing process of the transmission rod provided in an embodiment of this application; Figure 3A schematic diagram of the construction structure of the concrete pouring and vibration device for the side wall of the composite prefabricated subway station provided in this application embodiment; Figure 4 A top-view structural schematic diagram of a specific embodiment of the main reinforcement and branch reinforcement provided in this application; Figure 5 This is a structural schematic diagram of the main reinforcement and branch reinforcement provided in the embodiments of this application from a side view.

[0020] The following are the labeling elements in the figure: 100. Restriction sleeve; 200. Transmission rod; 300. Vibrator; 400. Clamp; 500. Reinforcing steel cage; 600. Precast side wall component; 700. Cast-in-place side wall area; 710. Base slab; 210. Main reinforcement; 220. Branch reinforcement; 230. Connecting plate; 240. Connecting sleeve; 310. Vibrator; 510. Vertical reinforcement; 520. Distribution reinforcement. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined. Example 1

[0023] Please see Figure 1 This embodiment provides a method for in-situ concrete pouring and vibration compaction of composite prefabricated subway station side walls, which includes the following steps: S100, the limiting sleeve 100 is fixed to the base plate 710 of the side wall in advance.

[0024] Specifically, the limiting sleeve 100 ( Figure 3(As shown in the figure) is fixed to the base plate 710 of the side wall. The function of the limiting sleeve 100 is to pre-embed and position. When the base plate 710 is poured, the limiting sleeve 100 is fixed at the designed vibration position. The concrete of the base plate 710 is poured to make the limiting sleeve 100 and the base plate 710 form an integral whole.

[0025] The limiting sleeve 100 is designed as a cylindrical hollow steel structure, used to pre-fix it into the concrete base 710 below the side wall, providing positioning support for the transmission rod 200. The inner diameter of the limiting sleeve 100 is 8-12mm larger than the outer diameter of the main reinforcement 210 of the transmission rod 200, reserving space for the transmission rod 200 to vibrate, thus preventing vibration energy from being transferred to the base 710 and causing insufficient vibration of the side wall. The inner depth of the sleeve is not less than 0.5m to ensure that the transmission rod 200 will not slip after being embedded, ensuring construction safety.

[0026] For example, the limiting sleeve 100 can be made of Q235B steel with a wall thickness of not less than 6mm, and has sufficient vibration resistance to avoid deformation and damage during vibration.

[0027] S200, manufacture transmission rod 200.

[0028] Specifically, a transmission rod 200 is manufactured. The transmission rod 200 is the core vibration transmission component. The transmission rod 200 can be designed according to the height of the prefabricated component 600 of the side wall to ensure that the transmission rod 200 can extend upward from the limiting sleeve 100 to the outside of the side wall.

[0029] S300, Install the transmission rod 200 on the limiting sleeve 100 to embed the transmission rod 200 into the limiting sleeve 100 and extend the transmission rod 200 upward from the limiting sleeve 100 to the outside of the side wall.

[0030] Specifically, a transmission rod 200 is installed on the limiting sleeve 100, so that the transmission rod 200 is embedded in the limiting sleeve 100 and extends upward from the limiting sleeve 100 to the outside of the side wall. For example, the prefabricated transmission rod 200 is hoisted to the limiting sleeve 100 in the cast-in-place area 700 of the composite side wall, the embedded part of the main reinforcement 210 is inserted into the limiting sleeve 100, and then the upper part of the transmission rod 200 can be fixed to the reinforcement cage 500 by the clamp 400.

[0031] S400. Assemble the drive bar 200 and the vibrator 300 together so that the vibrator 300 and the drive bar 200 are connected in a drive connection.

[0032] Specifically, the drive rod 200 and the vibrator 300 are assembled together to drive the vibrator 300 to the drive rod 200. For example, the vibrating rod 310 of the immersion vibrator 300 is inserted into the connecting sleeve 240 of the drive rod 200 to complete the assembly. The vibrator 300 can be an existing high-frequency immersion vibrator 300. The vibrating rod 310 of the vibrator 300 can be directly inserted into the connecting sleeve 240, and the vibration energy is transmitted to the drive rod 200 through the connecting sleeve 240, and then diffused to various areas of the side wall concrete.

[0033] S500, pour the side wall concrete and start the vibrator 300. The vibrator 300 drives the transmission rod 200 to vibrate, so as to transmit the vibration to the side wall concrete and make the transmission rod 200 and the side wall concrete form an integral structure to achieve the integral pouring of the side wall concrete.

[0034] Specifically, the side wall concrete is poured, and the vibrator 300 is activated. The vibrator 300 drives the transmission rod 200 to vibrate, transmitting the vibration to the side wall concrete and forming an integral structure with the transmission rod 200, thus achieving integrated pouring of the side wall concrete. In this embodiment, integrated pouring and vibration are adopted. The side wall concrete is poured, and the vibrator 300 is activated simultaneously. The vibration energy is transmitted to the concrete through the connecting sleeve 240 → connecting plate 230 → main reinforcement 210 → branch reinforcement 220, achieving full-height vibration. After vibration is completed, the vibrator 300 is removed, while the transmission rod 200 remains in the concrete, forming an integral structure with the side wall and participating in the structural stress.

[0035] Specifically, step S100 includes the following steps: S110, Fix the limiting sleeve 100 at the designated position on the base plate 710; S120, pour concrete for the base plate 710 to fix the limiting sleeve 100 to the concrete for the base plate 710.

[0036] Specifically, step S120 is followed by: S130, Assemble prefabricated components 600 for the side walls of the metro station on one side of the 710 concrete base slab, such as installing the prefabricated components 600 for the side walls on the 710 concrete base slab.

[0037] S140. Erect formwork in the foundation pit on the side away from the prefabricated subway station of the 710 concrete base slab to form the cast-in-place side wall area 700 in the foundation pit.

[0038] S150. Within the cast-in-place area 700 of the side wall, a steel reinforcement cage 500 is tied according to the design. The steel reinforcement cage 500 includes several vertical steel bars 510 and distribution steel bars 520 connected to the vertical steel bars 510.

[0039] Specifically, please refer to Figure 2Step S200 includes the following steps: S210. Prepare the materials for manufacturing the transmission rod 200. The materials include the main reinforcement 210, several branch reinforcement bars 220, connecting plate 230, and connecting sleeve 240.

[0040] S220. An embedding portion for embedding the limiting sleeve 100 is reserved at the end of the main reinforcement 210.

[0041] S230. Weld multiple layers of branch steel bars 220 on the side of the main reinforcement 210 away from the embedded part, so that multiple branch steel bars 220 are evenly distributed radially on the main reinforcement 210, and the branch steel bars 220 between layers are staggered.

[0042] S240. A connecting plate 230 is welded to the first end of the main reinforcement 210, and a connecting sleeve 240 is welded to the side of the connecting plate 230 away from the main reinforcement 210. The connecting sleeve 240 is used to connect to the vibrator 310 of the vibrator 300.

[0043] For example, the main reinforcement 210, branch reinforcement 220, connecting plate 230, and connecting sleeve 240 are connected together by welding. The specific design process is as follows: Please see Figure 3 The main reinforcement 210 uses HRB400E threaded steel with a diameter of 32mm. The length of the main reinforcement 210 is consistent with the height of the precast component 600 of the side wall. A 300mm long embedded part is reserved at the end for inserting the limiting sleeve 100. The first end is fully welded to the connecting plate 230. The welding adopts gas shielded welding, the bevel is U-shaped, and the weld leg height is not less than 10mm.

[0044] Branch reinforcement 220 uses 12mm diameter HRB400E threaded steel, arranged in layers along the length of main reinforcement 210, with 3 bars per layer and a layer spacing of 0.3-0.8m, preferably 0.5m; please refer to Figure 4 Within a single layer, the branch reinforcement 220 is evenly distributed radially at 120° along the main reinforcement 210, with staggered arrangements between layers, such as a 60° angle between the projected branch reinforcement 220 of adjacent layers; please refer to [link / reference]. Figure 5 The branch reinforcement 220 and the main reinforcement 210 are inclined downward at an angle of 45°. The projection distance of the end of the branch reinforcement 220 is less than the net width of the cast-in-place area to ensure full contact with the concrete.

[0045] The connecting plate 230 is made of 16mm thick Q235B steel plate with a size of 150mm×150mm. The center of the connecting plate 230 is welded to the main reinforcement 210, and the side away from the main reinforcement 210 is fully welded to the connecting sleeve 240 to ensure that the vibration energy is transmitted without attenuation.

[0046] The inner diameter of the connecting sleeve 240 is slightly larger than the outer diameter of the vibrator 310 of the immersion vibrator 300. The wall thickness of the connecting sleeve 240 is not less than 5mm, and the length of the connecting sleeve 240 is greater than 1 / 3 of the length of the vibrator to prevent the vibrator from slipping out of the sleeve during vibration. The connecting sleeve 240 is welded to the connecting plate 230 with a V-groove, and the weld joint is inspected for flaws to ensure vibration resistance.

[0047] Specifically, step S300 includes: S310. Hoist the transmission rod 200 above the limiting sleeve 100, and then insert the embedding part into the limiting sleeve 100 to complete the initial positioning of the transmission rod 200.

[0048] S320. Install a clamp 400 on the side of the main reinforcement 210 near the connecting plate 230, so that the clamp 400 wraps around the main reinforcement 210 and fixes the clamp 400 to the steel reinforcement cage 500 in the foundation pit.

[0049] In this embodiment, the clamp 400 is a two-part steel clamp 400. The inner diameter of the clamp 400 is 5mm larger than the outer diameter of the main reinforcement 210 to provide room for movement of the transmission rod 200 during vibration. The clamp 400 is used to wrap the main reinforcement 210 near the connecting plate 230. After being fastened with bolts, the clamp 400 is welded and fixed to the steel reinforcement skeleton 500 in the foundation pit. The function of the clamp 400 is to assist in positioning the transmission rod 200, to prevent excessive shaking of the transmission rod 200 during vibration, and at the same time, to not affect the normal vibration of the transmission rod 200.

[0050] Compared with existing technologies, the beneficial effects of the concrete pouring and vibration method for composite prefabricated subway station side walls provided in this application are as follows: 1. Improved vibration thoroughness: By arranging the branch steel bars in layers with staggered spacing, the vibration contact area is increased, allowing the vibration energy to be evenly transmitted to the bottom of the side wall, solving the problem of blind spots in traditional vibration and improving the density of concrete.

[0051] 2. Achieve integrated casting: No need for layered casting, eliminate construction joints, improve the impermeability of side walls, and significantly enhance the overall structural integrity.

[0052] 3. Enhanced structural strength: The transmission rod 200 is made of high-strength threaded steel and remains in the concrete after vibration. Under the premise of controlling the reinforcement ratio to not exceed the maximum value specified in the code, it can improve the bending strength of the side wall.

[0053] 4. Improved construction efficiency: Reducing the relocation of vibration equipment and the dismantling of vibration transmission structures can shorten the construction period for pouring and vibrating a single side wall and reduce labor costs.

[0054] 5. High adaptability: The size of the transmission rod 200 and the arrangement of the branch steel bars 220 can be adjusted according to the height of the side wall and the concrete grade, making it suitable for the construction of composite prefabricated subway stations under different geological conditions.

[0055] For example, the concrete pouring and vibration method for the side walls of the composite prefabricated subway station of this application was used to perform vibration work on a standard section of the side walls of a subway station. The prefabricated components of the composite prefabricated subway station side walls were 600mm high with a height of 10m, the width of the cast-in-place area was 0.8m, and the concrete grade was C40P8. The entire process is as follows: S1. Embedded Restriction Sleeve 100: Fabricate a Q235B steel restriction sleeve 100 with an inner diameter of 40mm, a length of 600mm, and a wall thickness of 6mm. During the reinforcement binding stage of the base slab 710, fix the restriction sleeve 100 at the designed position below the center line of the side wall. The top of the restriction sleeve 100 is 50mm higher than the reinforcement surface of the base slab 710. It can be fixed to the reinforcement of the base slab 710 by spot welding. Then pour the C35 concrete of the base slab 710 to ensure that the restriction sleeve 100 is tightly bonded to the concrete of the base slab 710. After curing for 7 days, it is ready for use.

[0056] S2. Fabrication of transmission rod 200: (1) The main reinforcement 210 is made of 32mm HRB400E threaded steel, with a length of 10m. The end 300mm section is polished smooth as an embedding part; (2) The branch reinforcement 220 is made of 12mm HRB400E threaded steel, arranged at a layer spacing of 0.5m, with a total of 19 layers and 3 bars per layer. The included angle between the branch reinforcement 220 in a single layer is distributed at 120°, and the interlayer is staggered by 60°. The downward inclination angle between the branch reinforcement 220 and the main reinforcement 210 is 45°. The end of the branch reinforcement 220 is far from the cast-in-place concrete. The edge of the area is not less than 100mm; (3) The connecting plate 230 is made of 16mm×150mm×150mm Q235B steel plate. The center of the connecting plate 230 is fully welded to the first end of the main reinforcement 210. The welding is performed by CO2 gas shielded welding. The weld has a U-shaped bevel and the weld leg height is 10mm; (4) The connecting sleeve 240 is made of seamless steel pipe with an inner diameter of 50mm, a length of 800mm and a wall thickness of 5mm. The connecting sleeve 240 and the connecting plate 230 are fully welded to the side away from the main reinforcement 210. The V-shaped bevel is used. After welding, a penetrant test is performed.

[0057] S3. Assembly and positioning of the device: (1) After the precast side wall component 600 is hoisted into place, the cast-in-place side wall area 700 is erected inside the foundation pit, and the side wall steel reinforcement skeleton 500 is tied. The diameter of the vertical bar of the side wall steel reinforcement skeleton 500 is 25mm, and the diameter of the distribution bar of the side wall steel reinforcement skeleton 500 is 10mm; (2) The transmission rod 200 is hoisted above the limiting sleeve 100, and the main reinforcement 210 is inserted into the sleeve to a depth of 300mm; (3) A two-half steel clamp 400 with an inner diameter of 38mm is installed 1.5m away from the top of the main reinforcement 210. The clamp 400 is fixed to the side wall steel reinforcement skeleton 500 by welding with φ16 round steel to ensure that the main reinforcement 210 can vibrate slightly along the axial direction.

[0058] S4. Vibration and Pouring: (1) Select ZN-50 type immersion vibrator 300 (vibration frequency 220Hz, vibrator rod 310 diameter 50mm), insert vibrator rod 310 into connecting sleeve 240, insertion depth 500mm; (2) Use concrete pump truck to continuously pour C40P8 concrete from bottom to top of side wall, control the pouring speed at 0.3m³ / min, start vibrator 300 synchronously, and stop vibrating for 30s every 1m height; (3) After pouring, keep vibrator 300 working for 5min to ensure that air bubbles in concrete are fully discharged, then turn off vibrator 300, pull out vibrator rod 310, and leave transmission rod 200 in concrete.

[0059] S5. Curing and Testing: After the side wall concrete is poured, it is covered with geotextile and watered for 14 days. About one month later, the concrete density is tested by ultrasonic testing. The results show that the concrete density of the entire side wall is uniform, there are no honeycombs or pits at the bottom, the impermeability test shows no leakage, and the structural strength meets the standards.

[0060] Compared with existing technologies, the concrete pouring and vibration method for the side walls of the composite prefabricated subway station in this application, compared with the side wall construction effect of the traditional layered vibration process, can avoid the formation of construction joints, improve the density of the bottom concrete, increase the anti-seepage pressure of the side wall, shorten the construction period of a single side wall, and reduce labor costs. Example 2

[0061] Please see Figure 1Based on the above-mentioned method for vibrating and compacting cast-in-place concrete for the side wall of a prefabricated metro station, this application also provides a corresponding vibrating and compacting device for the side wall of a prefabricated metro station. The vibrating and compacting device for the side wall of a prefabricated metro station includes: a limiting sleeve 100, a transmission rod 200, a vibrator 300, and a clamp 400. The limiting sleeve 100 is pre-set on the bottom plate 710 of the side wall. The transmission rod 200 is embedded in the limiting sleeve 100 and extends upward from the limiting sleeve 100 to the outside of the side wall. The vibrator 300 is connected to the side of the transmission rod 200 away from the limiting sleeve 100. The vibrator 300 is used to drive the transmission rod 200 to vibrate, so as to transmit the vibration to the side wall concrete and make the transmission rod 200 and the side wall concrete form an integral structure. The clamp 400 is fixed to the steel reinforcement cage 500 inside the foundation pit. The clamp 400 is used to wrap around the side of the main reinforcement 210 near the connecting plate 230.

[0062] Specifically, the transmission rod 200 includes a main reinforcement 210, several branch reinforcements 220, a connecting plate 230, and a connecting sleeve 240. The end of the main reinforcement 210 is provided with an embedding part for embedding into the limiting sleeve 100. Multiple layers of branch reinforcements 220 are provided on the side of the main reinforcement 210 away from the embedding part, so that multiple branch reinforcements 220 are radially evenly distributed in the main reinforcement 210, and the branch reinforcements 220 between layers are staggered. The beginning end of the main reinforcement 210 is provided with a connecting plate 230, and the side of the connecting plate 230 away from the main reinforcement 210 is provided with a connecting sleeve 240. The connecting sleeve 240 is used to connect with the vibrator 310 of the vibrator 300.

[0063] This application increases the vibration contact area by using staggered layering of branch reinforcement bars 220, allowing vibration energy to be evenly transmitted to the bottom of the side wall. This solves the problem of blind spots in traditional vibration, improves the concrete density compliance rate, eliminates the need for layered pouring, removes construction joints, improves the impermeability of the side wall, and significantly enhances the overall structural integrity. The transmission rod 200 is made of high-strength threaded steel and remains in the concrete after vibration. Under the premise of controlling the reinforcement ratio to not exceed the maximum value specified, it can improve the bending strength of the side wall, reduce the need for relocation of vibration equipment and demolition of vibration transmission structures, shorten the construction period of single-pane side wall pouring and vibration, and reduce labor costs. The size of the transmission rod 200 and the arrangement of branch reinforcement bars 220 can be adjusted according to the side wall height and concrete grade, making it suitable for the construction of composite prefabricated subway stations under different geological conditions.

[0064] In summary, this application discloses a method and apparatus for vibrating and compacting cast-in-place concrete for the side walls of composite prefabricated subway stations. The method includes: pre-fixing a limiting sleeve to the bottom plate of the side wall; installing a transmission rod on the limiting sleeve, embedding the transmission rod into the limiting sleeve, and extending the transmission rod upwards from the limiting sleeve to the outside of the side wall; assembling the transmission rod with a vibrator to drive the vibrator; pouring the side wall concrete and starting the vibrator, which drives the transmission rod to vibrate, transmitting the vibration to the side wall concrete and forming an integral structure with the transmission rod, thus achieving integral casting of the side wall concrete. This application solves the problem of insufficient vibration of the bottom concrete of the side wall, eliminates the construction joint of layered pouring, enhances the structural strength of the side wall, improves construction efficiency, and is applicable to the construction of side walls for various composite prefabricated subway stations.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for in-situ concrete pouring and vibration compaction of composite prefabricated subway station side walls, characterized in that, Includes the following steps: The limiting sleeve is pre-fixed to the bottom plate of the side wall; A transmission rod is installed on the limiting sleeve to embed the transmission rod into the limiting sleeve and to extend the transmission rod upward from the limiting sleeve to the outside of the side wall; The drive rod is assembled with the vibrator so that the vibrator is driven to connect with the drive rod. The side wall concrete is poured, and the vibrator is started. The vibrator drives the transmission rod to vibrate, so as to transmit the vibration to the side wall concrete and make the transmission rod and the side wall concrete form an integral structure, so as to realize the integral pouring of the side wall concrete.

2. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 1, characterized in that, The step of pre-fixing the limiting sleeve to the base plate of the side wall includes: The limiting sleeve is fixed at a designated position on the base plate; Pour the base slab concrete to fix the limiting sleeve to the base slab concrete.

3. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 2, characterized in that, After the step of pouring the base slab concrete to fix the limiting sleeve to the base slab concrete, the method further includes: Precast components for the side walls of the prefabricated subway station are assembled on one side of the concrete base slab. Formwork is erected in the foundation pit on the side of the base slab concrete away from the prefabricated subway station to form a cast-in-place area for the side walls in the foundation pit; The reinforcing steel frame is tied according to the design within the cast-in-place area of ​​the side wall.

4. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 1, characterized in that, Before the step of installing the transmission rod on the limiting sleeve, embedding the transmission rod into the limiting sleeve, and extending the transmission rod upward from the limiting sleeve to the outside of the side wall, the method further includes: Prepare the materials for manufacturing the transmission rod, including main reinforcement bars, several branch reinforcement bars, connecting plates, and connecting sleeves; An embedding portion for embedding the limiting sleeve is reserved at the end of the main rib; Multiple layers of branch steel bars are welded to the side of the main reinforcement bar away from the embedded part, so that multiple branch steel bars are evenly distributed radially on the main reinforcement bar, and the branch steel bars between layers are staggered. The connecting plate is welded to the first end of the main reinforcement, and the connecting sleeve is welded to the side of the connecting plate away from the main reinforcement. The connecting sleeve is used to connect to the vibrator rod of the vibrator.

5. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 4, characterized in that, In the step of welding multiple layers of branch reinforcement bars on the side of the main reinforcement bar away from the embedded part, so that multiple branch reinforcement bars are radially evenly distributed on the main reinforcement bar and the branch reinforcement bars between layers are staggered, the included angle between multiple branch reinforcement bars in a single layer is 120°, the downward inclination angle between the branch reinforcement bars and the main reinforcement bar is 45°, and the spacing between the branch reinforcement bars between layers is 0.3-0.8m.

6. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 4, characterized in that, The step of installing the transmission rod on the limiting sleeve, embedding the transmission rod into the limiting sleeve, and extending the transmission rod upward from the limiting sleeve to the outside of the side wall includes: The transmission rod is hoisted above the limiting sleeve, and then the embedding part is embedded into the limiting sleeve to complete the initial positioning of the transmission rod. A clamp is installed on the side of the main reinforcement bar near the connecting plate, so that the clamp wraps around the main reinforcement bar and fixes the clamp to the steel reinforcement skeleton in the foundation pit.

7. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 6, characterized in that, In the step of installing a clamp on the side of the main reinforcement bar near the connecting plate, so that the clamp wraps around the main reinforcement bar and fixes the clamp to the steel reinforcement skeleton in the foundation pit, the inner diameter of the clamp and the inner diameter of the limiting sleeve are both larger than the outer diameter of the main reinforcement bar, so as to provide the transmission rod with room to move when vibrating.

8. The method for in-situ concrete pouring and vibration compaction of the side wall of a composite prefabricated subway station as described in claim 6, characterized in that, In the step of hoisting the transmission rod above the limiting sleeve and then embedding the embedding part into the limiting sleeve to complete the initial positioning of the transmission rod, the inner depth of the limiting sleeve is not less than 0.5m to prevent the transmission rod from sliding out of the sleeve.

9. A concrete pouring vibration device for composite prefabricated subway station sidewalls based on the concrete pouring vibration method for composite prefabricated subway station sidewalls according to any one of claims 1-8, characterized in that, include: A limiting sleeve, which is pre-installed on the bottom plate of the side wall; A transmission rod is embedded in the limiting sleeve and extends upward from the limiting sleeve to the outside of the side wall; A vibrator is connected to the side of the drive rod away from the limiting sleeve. The vibrator is used to drive the drive rod to vibrate so as to transmit the vibration to the side wall concrete and make the drive rod and the side wall concrete form an integral structure.

10. The in-situ concrete pouring and vibration device for the composite prefabricated subway station side wall as described in claim 9, characterized in that, The transmission rod includes a main bar, several branch bars, a connecting plate, and a connecting sleeve. The end of the main bar is provided with an embedding part for embedding into the limiting sleeve. Multiple layers of branch bars are provided on the side of the main bar away from the embedding part, so that multiple branch bars are radially evenly distributed on the main bar, and the branch bars between layers are staggered. The beginning of the main bar is provided with the connecting plate, and the connecting sleeve is provided on the side of the connecting plate away from the main bar. The connecting sleeve is used to connect with the vibrating rod of the vibrator. The vibrating device also includes: The clamp is fixed to the steel reinforcement skeleton inside the foundation pit and is used to wrap around the side of the main reinforcement near the connecting plate.

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