Construction method and construction hanging basket for building continuous beams in parallel

Abstract

The invention relates to the technical field of bridge construction, and provides a construction method for building continuous beams in parallel and a construction hanging basket. The construction hanging basket comprises a hanging basket body, a first hanging rod used for bearing the construction load of the hanging basket body is poured on the hanging basket body through concrete, and extension sections are bolted to the two ends of the hanging basket body; the extension section is provided with a second hanging rod used for guiding the hanging basket to move and temporarily supporting the extension section, through interval construction of the parallel-built continuous beams and by combining the avoiding design of the extension section, the problem of interference of small-interval parallel-built continuous beam hanging basket construction is solved, and the construction efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction technology, in particular to a parallel continuous beam construction method and a construction hanging basket. BACKGROUND

[0002] In the field of bridge engineering construction, continuous beams are widely used in scenarios such as crossing rivers, roads, etc. due to their strong crossing ability, large structural stiffness, and good driving smoothness. In particular, in railway hubs and station connecting lines, to meet the intensive transportation demand, multi-line parallel continuous beam structures are commonly used. With the continuous improvement of the transportation network, the space utilization requirement of line planning is increasing, and the design spacing of some parallel continuous beams is greatly reduced. For example, the "small spacing" construction scenario where the gap between adjacent beam bodies is only 10 cm. Such projects not only need to ensure the construction quality and structural safety of the continuous beam itself, but also need to deal with the coordination problem of each joint continuous beam construction in a narrow working space, which puts higher requirements on the adaptability and efficiency of the construction process.

[0003] At present, hanging baskets are commonly used as core equipment in the cantilever cast-in-place construction of continuous beams. The transverse beam, bottom mold transverse beam, and front and rear hangers of the conventional hanging basket structure are usually 50-100 cm wider than the beam body to ensure that the bottom mold system can move forward or backward synchronously with the hanging basket and avoid being hindered by the cast-in-place segment concrete. However, in the construction scenario of super-small spacing parallel continuous beams, the conventional hanging basket structure has obvious limitations. The transversely extended parts of adjacent hanging baskets are prone to conflict, causing difficulties in moving forward, backward, or removing the hanging baskets, and making it impossible to achieve synchronous construction of multiple joint continuous beams. The turnover of materials such as hanging baskets takes too long, significantly prolonging the construction period and increasing the economic cost of the project. SUMMARY

[0004] The purpose of the present application is to provide a parallel continuous beam construction method and a construction hanging basket, which solves the problems of hanging basket conflict and long construction period in the construction of small spacing parallel continuous beams.

[0005] The present application is achieved by the following technical solution: a parallel continuous beam construction method suitable for at least three parallel continuous beam construction, comprising the following steps: Step S1, synchronously construct at least two continuous beams arranged at intervals, and there is one remaining joint between adjacent interval joints. First, the cantilever segment of the interval joint continuous beam is poured through the hanging basket, and the hanging basket includes an extension segment at both ends which can be detachably connected to avoid spatial interference between adjacent hanging baskets; Step S2, when the cantilever segment of the interval joint continuous beam is constructed to meet the required hanging basket operation space of the remaining joint continuous beam, the construction of the remaining joint continuous beam is started, and the interval joint continuous beam and the remaining joint continuous beam are constructed in turn. If the remaining segment of the hanging basket of the interval segment needs to pass through the hanging basket of the remaining segment when the closure segment construction of the interval segment continuous beam is carried out, the extended segment near the hanging basket of the remaining segment is disassembled; Or, if the hanging basket of the interval segment needs to pass through the hanging basket of the remaining segment after the closure segment construction of the interval segment continuous beam is completed, the extended segment near the hanging basket of the remaining segment is disassembled; Step S4, disassemble all the hanging baskets and complete the construction.

[0006] Further, in step S2, after the remaining segment continuous beam starts construction, the interval segment continuous beam and the remaining segment continuous beam are constructed in the same direction, and the construction progress of the interval segment continuous beam is prior to the construction progress of the remaining segment continuous beam.

[0007] Further, in step S2, when the horizontal distance from the outer edge of the cantilever segment of the interval segment continuous beam to the design axis of the remaining segment continuous beam is greater than the longitudinal operation width of the hanging basket, the construction of the remaining segment continuous beam is started.

[0008] Further, in step S3, the first hoist on the hanging basket is used for bearing the construction load of the hanging basket, and before the extended segment is disassembled, the first hoist on the hanging basket to which the extended segment belongs needs to be anchored first.

[0009] Further, in step S3, after the extended segment is disassembled, the hanging basket of the remaining segment is moved forward or the hanging basket of the interval segment is moved backward to restore the extended segment.

[0010] Further, in step S4, the hanging basket of the interval segment continuous beam is disassembled first, and then the hanging basket of the remaining segment continuous beam is disassembled.

[0011] A construction hanging basket comprises a hanging basket, and extended segments are bolted at both ends of the hanging basket.

[0012] Further, a second hoist is arranged on the extended segment for guiding the movement of the hanging basket and temporarily supporting the extended segment.

[0013] Further, the continuous beam is arranged orthogonally or obliquely to the span.

[0014] The present application has at least the following advantages and beneficial effects: through the interval construction of the continuous beam, combined with the avoidance design of the extended segment, the problem of the interference of the hanging basket construction of the small-interval continuous beam is solved, and the construction efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the construction hanging basket in the present application.

[0016] Figure 2 It is a structural schematic diagram of the forward movement of the remaining segment hanging basket in the present application.

[0017] Figure 3 This is a schematic diagram of the retraction structure of the intermediate hanging basket in this invention.

[0018] Figure 4 This is a schematic diagram of the continuous beam and the spanning structure arranged obliquely in this invention.

[0019] Figure 5 This is a schematic diagram of the continuous beam and the spanning structure arranged orthogonally in this invention.

[0020] Attached reference numerals: 1-continuous beam, 2-hanging basket, 21-extension section, 22-first hanger, 23-second hanger. Detailed Implementation

[0021] The specific implementation method is described below with reference to the accompanying drawings.

[0022] Example like Figures 1 to 5 As shown, this embodiment mainly discloses a construction method for a parallel continuous beam 1, applicable to the construction of at least three parallel continuous beams 1. The continuous beam 1 can be arranged orthogonally or obliquely to the object it crosses. This embodiment takes a three-span parallel continuous beam 1 as an example for illustration, including the following steps: Step S1: Simultaneously construct at least two continuous beams 1 with intervals, and with one remaining beam between adjacent intervals. First, pour the cantilever section of the interval continuous beam 1 using a formwork 2. The formwork 2 includes an extension section 21 that is detachably connected at both ends to avoid spatial interference between adjacent formworks 2. For example, three continuous beams 1 are numbered sequentially as the 1st, 2nd and 3rd beams. Select two interval continuous beams 1 (the 1st and 3rd beams), with a remaining beam (the 2nd beam) between the intervals. The construction of the formwork 2 for the 1st and 3rd continuous beams 1 is not subject to spatial interference and can be carried out simultaneously, with a construction progress deviation of no more than one segment.

[0023] Step S2: After the cantilever section of the inter-braced continuous beam 1 is constructed to the point where the working space of the hanging basket 2 required for the remaining continuous beam 1 is met, construction of the remaining continuous beam 1 begins. The inter-braced continuous beam 1 and the remaining continuous beam 1 are constructed sequentially, with the cantilever section and the closure section being constructed respectively. Specifically, the horizontal distance from the outer edge of the cantilever section of the inter-braced continuous beam 1 to the design axis of the remaining continuous beam 1 is measured on-site using a total station. When this horizontal distance is greater than the longitudinal working width of the hanging basket 2, construction of the remaining continuous beam 1 begins. Subsequent inter-braced and remaining continuous beams are constructed in the order of cantilever section pouring to closure section pouring. Before pouring the cantilever section, the hanging basket 2 must be anchored to ensure the construction safety of the continuous beam 1, prevent structural instability, control the beam alignment accuracy, ensure structural design requirements, resist construction environmental loads, and enhance operational stability.

[0024] Step S3, if the gap connection continuous beam 1 is constructed by closure section, the remaining connection hanging basket 2 needs to move forward through the hanging basket 2 of the gap connection, and the extended section 21 close to the hanging basket 2 of the remaining connection is disassembled; specifically, when the gap connection continuous beam 1 (the first connection and the third connection) is constructed by closure section, the closure section time is long, which will affect the forward movement of the hanging basket 2 of the remaining connection continuous beam 1 (the second connection). In this case, the hanging basket 2 of the gap connection does not move during the construction of the closure section, and after anchoring, the extended section 21 (the second lifting rod 23, the hoist and) close to the side of the remaining connection continuous beam 1 (the second connection) of the hanging basket 2 of the gap connection continuous beam 1 (the first connection and the third connection) is disassembled, so as to avoid the interference between the hanging basket 2 of the remaining connection and the hanging basket 2 of the gap connection, and then the remaining connection continuous beam 1 (the second connection) is moved forward.

[0025] Alternatively, if the gap connection continuous beam 1 is constructed by closure section, the hanging basket 2 of the gap connection needs to retreat through the hanging basket 2 of the remaining connection, and the extended section 21 close to the hanging basket 2 of the remaining connection at the end of the hanging basket 2 is disassembled; specifically, the continuous beam 1 usually spans roads, rivers and valleys, so that after the closure section construction of the gap connection continuous beam 1, there is no problem of disassembling the hanging basket 2 in situ, and only the hanging basket 2 can be retreated to realize disassembly. In this case, after the hanging basket 2 of the remaining connection continuous beam 1 (the second connection) is anchored, the extended section 21 (the second lifting rod 23, the hoist and) close to the side of the gap connection continuous beam 1 (the first connection and the third connection) of the hanging basket 2 is disassembled, so as to avoid the interference between the hanging basket 2 of the remaining connection and the hanging basket 2 of the gap connection, and then the gap connection continuous beam 1 (the first connection and the third connection) is retreated.

[0026] Step S4, disassemble all the hanging baskets 2 and complete the construction. After the closure section construction of all the connections (the first connection, the second connection and the third connection) continuous beam 1 is completed and the concrete strength reaches the design value (≥C50), all the hanging baskets 2 are disassembled, and the anchoring connection between the hanging basket 2 and the continuous beam 1 body needs to be disengaged before disassembly.

[0027] Further, in the above step S2 provided by the embodiment of the application, after the remaining connection continuous beam 1 starts construction, the gap connection continuous beam 1 and the remaining connection continuous beam 1 are constructed in the same direction (from the main pier to the side pier direction), and the construction process of the gap connection continuous beam 1 is prior to that of the remaining connection continuous beam 1 (the construction process of the gap connection is prior to that of the remaining connection by at least one cantilever section period), so that the construction of the remaining connection continuous beam 1 has a certain lag, ensuring that the hanging baskets 2 of the gap connection and the remaining connection do not overlap in the longitudinal projection, and avoiding the longitudinal bar interference.

[0028] Further, in the step S3, the first suspender 22 is used to bear the construction load of the hanging basket 2. Before the extension segment 21 is removed, the first suspender 22 of the hanging basket 2 to which the extension segment 21 belongs needs to be anchored first. One end of the first suspender 22 is rigidly connected to the embedded part of the top plate or web of the continuous beam 1 through anchoring devices (such as anchor nuts and anchor pads), and the other end is connected to the hanging basket 2, so as to avoid the interference of the movement of the adjacent hanging basket 2 on the stability of the hanging basket 2, and ensure the stability of the structure.

[0029] Further, in the step S3, after the extension segment 21 is removed, the hanging basket 2 of the remaining joint is moved forward or the hanging basket 2 of the interval joint is moved backward to complete the recovery of the extension segment 21. Based on the load bearing, subsequent process connection and structural safety requirements of the construction of the continuous beam 1 with small spacing, the connection of the extension segment 21 is immediately restored after avoiding the adjacent hanging basket 2, the complete force system of the hanging basket 2 is restored, and the subsequent construction load bearing is ensured. In the subsequent step S4, the hanging basket 2 is removed as a whole with the extension segment 21, the generality of the hanging basket 2 structure is maintained, and the subsequent use is facilitated.

[0030] Further, in the step S4, the hanging basket 2 of the interval joint continuous beam 1 is removed first, and then the hanging basket 2 of the remaining joint continuous beam 1 is removed, so as to ensure sufficient removal space, reduce cross operation, and improve hoisting safety.

[0031] In the embodiment, a construction hanging basket 2 is also disclosed, which comprises the hanging basket 2, and the extension segment 21 is bolted at both ends of the hanging basket 2. Specifically, the bolted joint of the hanging basket 2 and the extension segment 21 is arranged at the position of the non-maximum force joint of the cross beam of the hanging basket 2, and avoids the structural interference with the vertical plane of the hanging basket 2, avoids the failure and fracture of the connecting bolt, and ensures the bearing capacity of the hanging basket 2 in the small spacing scenario. The second suspender 23 is arranged on the extension segment 21 and is used to guide the movement of the hanging basket 2 and temporarily support the extension segment 21. One end of the second suspender 23 is connected to the running wheel (the running structure of the conventional hanging basket 2) arranged on the hanging basket 2, is guided along the running track of the top plate of the continuous beam 1 body, and is kept vertical during movement to avoid the deviation of the running wheel. When the extension segment 21 is installed or removed, the second suspender 23 is pre-tightened through the chain hoist, bears the self-weight of the extension segment 21, ensures that the extension segment 21 is tightly fitted with the main body of the hanging basket 2 before the bolt is fastened, and avoids that the bolt bears additional shearing force.

Claims

1. A method for constructing parallel continuous beams, applicable to the construction of at least three parallel continuous beams (1), characterized in that, Includes the following steps: Step S1: At least two continuous beams (1) are arranged in a synchronous construction interval, with a remaining beam between adjacent intervals. First, the cantilever section of the continuous beam (1) of the interval is poured using a hanging basket (2). The hanging basket (2) includes an extension section (21) at both ends that is detachably connected to avoid spatial interference between adjacent hanging baskets (2). Step S2: When the cantilever section of the inter-connected continuous beam (1) is constructed to meet the working space of the hanging basket (2) required for the remaining continuous beam (1), the construction of the remaining continuous beam (1) is started. The inter-connected continuous beam (1) and the remaining continuous beam (1) are constructed in sequence with the cantilever section and the closure section respectively. Step S3: If the hanging basket (2) of the remaining link needs to be moved forward through the hanging basket (2) of the interval link when the continuous beam (1) of the interval link is being constructed, then the extension section (21) of the hanging basket (2) of the interval link close to the hanging basket (2) of the remaining link is disassembled. Alternatively, if after the closure section construction of the continuous beam (1) of the spacer is completed, the hanging basket (2) of the spacer needs to be retracted through the hanging basket (2) of the remaining link, then the extension section (21) of the hanging basket (2) of the remaining link close to the hanging basket (2) of the spacer is disassembled. Step S4: Remove all the hanging baskets (2) to complete the construction.

2. The construction method for a parallel continuous beam according to claim 1, characterized in that, In step S2, after the construction of the remaining continuous beam (1) begins, the spaced continuous beam (1) and the remaining continuous beam (1) are constructed in the same direction, and the construction process of the spaced continuous beam (1) precedes the construction process of the remaining continuous beam (1).

3. The construction method for a parallel continuous beam according to claim 1, characterized in that, In step S2, when the horizontal distance from the outer edge of the cantilever section of the inter-connected continuous beam (1) to the design axis of the remaining connected continuous beam (1) is greater than the longitudinal working width of the hanging basket (2), the construction of the remaining connected continuous beam (1) is started.

4. The construction method for a parallel continuous beam according to claim 1, characterized in that, In step S3, the first hanger (22) for bearing the construction load of the hanging basket (2) is poured with concrete on the hanging basket (2). Before dismantling the extension section (21), the first hanger (22) on the hanging basket (2) to which the extension section (21) to be dismantled belongs needs to be anchored first.

5. The construction method for a parallel continuous beam according to claim 1, characterized in that, In step S3, after the extension section (21) is disassembled, the extension section (21) is restored after the remaining hanging baskets (2) have moved forward or the hanging baskets (2) of the intervals have retracted.

6. The construction method for a parallel continuous beam according to claim 1, characterized in that, In step S4, the hanging basket (2) connecting the continuous beam (1) is first removed, and then the hanging basket (2) connecting the remaining continuous beam (1) is removed.

7. A construction formwork based on the construction method for a parallel continuous beam as described in any one of claims 1-6, characterized in that, Includes the hanging basket, and the extension section (21) is bolted to both ends of the hanging basket (2).

8. The construction formwork according to claim 6, characterized in that, The extension section (21) is provided with a second boom (23) for guiding the movement of the hanging basket (2) and temporarily supporting the extension section (21).

9. The construction formwork according to claim 6, characterized in that, The continuous beam (1) is arranged orthogonally or obliquely to the object it crosses.

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