A synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both railway and road use

Abstract

The present invention is a synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both road and rail use. The double-deck bridge for both road and rail use includes bridge piers, a lower beam, and an upper beam. The construction facilities include temporary anchorages, walkable brackets, and strengthening trusses. The lower beam and the upper beam are divided into several segments and are symmetrically cast and constructed in sequence from the middle to both ends. The present invention uses walkable brackets to achieve synchronous cantilever casting construction of the double-deck cast-in-place beam, avoiding the erection of ground brackets on land or water, which affects the traffic under the bridge or water navigation, and does not affect water navigation or the traffic under the bridge.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both highway and railway use. Background Technique

[0002] Due to the many favorable factors of the double-deck bridge for both highway and railway use, such as saving the channel resources of the bridge location, increasing the stiffness and running smoothness of the bridge, and being conducive to environmental protection and sustainable development, it has become an important bridge type in bridge planning and design and is highly favored.

[0003] For the prestressed concrete double-deck bridge for both highway and railway use, the rail trains and highway vehicles run in layers. The upper beam is often used as the highway beam, the lower beam is the rail beam, and the upper beam and the lower beam share the bridge piers.

[0004] Currently, for large-span double-deck bridges for both highway and railway use, the integral casting method with falsework is mostly adopted. The lower beam is constructed first and then the upper beam is constructed. When constructing the lower beam, it is necessary to set up falsework on land or water, which affects the traffic under the bridge or water navigation. After the construction of the lower beam is completed, falsework is set up on the top of the lower beam, and then the upper beam is constructed on the falsework. The overall construction efficiency is low. Summary of the Invention

[0005] The present invention aims to solve the deficiencies of the existing technology and provides a synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both highway and railway use.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both highway and railway use. The double-deck bridge for both highway and railway use includes bridge piers, a lower beam, and an upper beam. The construction facilities include temporary anchorage, a walkable falsework, and a strengthening truss. A support beam is provided between each pair of bridge piers. The lower beam and the upper beam are divided into several segments, and the construction is carried out symmetrically from the middle to both ends in sequence. The steps are as follows;

[0008] Step 1: Symmetrically construct the 0# and 1# segments of the lower beam and the 0# segment of the upper beam;

[0009] The temporary anchorage includes the temporary anchorage of the lower beam and the temporary anchorage of the upper beam. Temporary falsework is set up on both sides of the already constructed bridge piers. The temporary anchorage of the lower beam is arranged on the support beam, and the 0# and 1# segments of the lower beam are symmetrically constructed; after curing, temporary falsework is set up on the 0# segment of the lower beam, the temporary anchorage of the upper beam is arranged, the 0# segment of the upper beam is constructed, and after curing, the temporary falsework is removed;

[0010] Step 2: Symmetrically install the walkable falsework and construct the 2# segment of the lower beam and the 1# segment of the upper beam;

[0011] The walkable support bracket includes a sliding support mechanism, a vertical support mechanism, and a cantilever support mechanism;

[0012] The sliding support mechanism includes a slideway, a bottom cross beam, and a walking jack. The slideway is installed on the previously cast lower layer beam, and both the bottom cross beam and the walking jack are slidably installed on the slideway;

[0013] The vertical support mechanism is installed on the bottom cross beam and is used for the construction of the upper layer beam segment. And an elevating upper layer beam bottom formwork system is provided on the vertical support mechanism. The vertical support mechanism is connected to the walking jack and moves forward along the slideway under the action of the walking jack;

[0014] The cantilever support mechanism is installed on the vertical support mechanism and is used for the construction of the lower layer beam segment. And a lower layer beam bottom formwork system that can be lifted is provided on the cantilever support mechanism;

[0015] Construct the 2# segment of the lower layer beam on the lower layer beam bottom formwork system, and construct the 1# segment of the upper layer beam on the upper layer beam bottom formwork system. After the construction is completed, lower the lower layer beam bottom formwork system and the upper layer beam bottom formwork system, and then lengthen the slideway. The vertical support mechanism moves forward a segment distance under the action of the walking jack;

[0016] Step 3: Repeat Step 2 to continue cantilever construction, construct the subsequent segments of the upper layer beam and the lower layer beam. At the same time, install the strengthening truss to connect the previously cast lower layer beam and the upper layer beam into a whole. The construction of the lower layer beam segment leads the upper layer beam by one segment;

[0017] Step 4: The walkable support bracket gradually moves forward to the pier to construct the last segment of the lower layer beam and the corresponding upper layer beam segment;

[0018] Step 5: Remove the cantilever support mechanism, continue to move the vertical support mechanism forward, and construct the last segment of the upper layer beam;

[0019] Step 6: Remove the walkable support bracket, the strengthening truss, and the temporary anchorage to complete the construction of the entire bridge.

[0020] Specifically, in Step 1, the 0# segment of the lower layer beam is fixed to the support beam through the lower layer beam temporary anchorage, and the 0# segment of the upper layer beam is fixed to the top of the pier through the upper layer beam temporary anchorage.

[0021] Specifically, in Step 2, the vertical support mechanism includes support columns, diagonal bracing columns, connection systems, distribution beams, Bailey trusses, jacking jacks, and counterweights.

[0022] In particular, a number of support columns are installed in a row on the bottom cross beam, the diagonal support columns are installed on the support columns on the left and right sides, the adjacent support columns and the support columns and the diagonal support columns are connected by a connecting system, the jacking jacks are installed on the top of the support columns and the diagonal support columns, the distribution beam is installed on the top of the jacking jacks, the Bailey truss is installed on the top of the distribution beam, the upper beam bottom formwork system is installed on the top of the Bailey truss, and the counter-pressure block is installed on the top of the Bailey truss and is pressed by the completed upper beam.

[0023] Particularly, in step 2, the cantilever support mechanism includes a bracket, a through-type tensioning jack, and a steel strand harness.

[0024] In particular, the bracket is installed on the support column on the front side of the vertical support mechanism, a pair of through-type tensioning jacks are installed on the left and right ends of the top of the bracket away from the support column, and another pair of through-type tensioning jacks are installed on the left and right ends of the top of the bottom cross beam close to the bracket. The bottom formwork system of the lower beam is fixed by the through-type tensioning jacks and the steel strand bundle, and one end of the top of the bottom formwork system of the lower beam is abutted against the bottom of the completed lower beam.

[0025] In particular, the upper beam bottom formwork system is raised and lowered by means of a lifting jack, and the lower beam bottom formwork system is raised and lowered by means of a through-type tensioning jack.

[0026] The beneficial effects of the present invention are as follows: the present invention utilizes a walkable support to realize synchronous cantilever casting construction of a double-layer cast-in-place beam, has high construction efficiency, avoids setting up a floor support on land or water, and does not affect water navigation or traffic under a bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0029] Figure 3 It is a schematic cross-sectional view of the walkable support of the present invention;

[0030] Figure 4 It is a schematic elevation view of the walkable support of the present invention;

[0031] Figure 5 It is a schematic diagram of the cross section of the upper beam, lower beam and pier;

[0032] Figure 6 It is a schematic diagram of the elevation of the upper beam, lower beam and pier;

[0033] Figure 7 It is a schematic diagram of construction step 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of the second construction step of the present invention;

[0035] Figure 9 Schematic diagram of the third construction step of the present invention;

[0036] Figure 10 Schematic diagram of the fourth construction step of the present invention;

[0037] Figure 11 Schematic diagram of the fifth construction step of the present invention;

[0038] Figure 12 Schematic diagram of the sixth construction step of the present invention;

[0039] In the figure: 1 - pier;

[0040] 2 - lower layer beam;

[0041] 3 - upper layer beam;

[0042] 4 - temporary anchorage; 41 - temporary anchorage of the lower layer beam; 42 - temporary anchorage of the upper layer beam;

[0043] 5 - walkable support;

[0044] 51 - sliding support mechanism; 511 - slideway; 512 - bottom cross beam; 513 - walking jack;

[0045] 52 - vertical support mechanism; 521 - support column; 522 - inclined support column; 523 - connecting system; 524 - distribution beam; 525 - Bailey truss; 526 - jacking jack; 527 - bottom formwork system of the upper layer beam; 528 - counterweight;

[0046] 53 - cantilever support mechanism; 531 - bracket; 532 - bottom formwork system of the lower layer beam; 533 - through-type tensioning jack; 534 - steel strand bundle;

[0047] 6 - strengthening truss;

[0048] 7 - support beam;

[0049] The following will be described in detail with reference to the embodiments of the present invention and the accompanying drawings. Specific embodiments

[0050] The present invention will be further described below with reference to the embodiments:

[0051] As Figures 1-12 shown, a synchronous construction method for the upper layer beam and the lower layer beam of a dual-purpose public-rail double-deck bridge. The dual-purpose public-rail double-deck bridge includes piers 1, lower layer beams 2, and upper layer beams 3. The construction facilities include temporary anchorages 4, walkable supports 5, and strengthening trusses 6. A support beam 7 is provided between each pair of piers 1. The lower layer beams 2 and the upper layer beams 3 are divided into several segments and are symmetrically cast and constructed in sequence from the middle to both ends. The steps are as follows;

[0052] Step 1: Symmetrically construct the 0# and 1# segments of the lower beam 2 and the 0# segment of the upper beam 3.

[0053] The temporary anchorage 4 includes the lower beam temporary anchorage 41 and the upper beam temporary anchorage 42. Temporary supports are erected on both sides of the already constructed pier 1. The lower beam temporary anchorage 41 is arranged on the support beam 7, and the 0# and 1# segments of the lower beam 2 are symmetrically constructed. After curing, temporary supports are erected on the 0# segment of the lower beam 2, and the upper beam temporary anchorage 42 is arranged. The 0# segment of the upper beam 3 is constructed. After curing, the temporary supports are removed. The 0# segment of the lower beam 2 is fixed to the support beam 7 through the lower beam temporary anchorage 41, and the 0# segment of the upper beam 3 is fixed to the top of the pier 1 through the upper beam temporary anchorage 42. Specifically, the temporary anchorage 4 can adopt temporary concrete blocks and anchoring steel bars to fix the pier and the beam into one body, ensuring resistance to unbalanced forces during the cantilever construction process and improving the anti-overturning stability.

[0054] Step 2: Symmetrically install the movable support 5 and construct the 2# segment of the lower beam 2 and the 1# segment of the upper beam 3.

[0055] The movable support 5 includes a sliding support mechanism 51, a vertical support mechanism 52, and a cantilever support mechanism 53.

[0056] The sliding support mechanism 51 includes a slideway 511, a bottom cross beam 512, and a walking jack 513. The slideway 511 is installed on the already cast lower beam 2, and both the bottom cross beam 512 and the walking jack 513 are slidably installed on the slideway 511.

[0057] The vertical support mechanism 52 is installed on the bottom cross beam 512 for the construction of the upper beam 3 segments. The vertical support mechanism 52 is provided with a liftable bottom formwork system 527 for the upper beam. The vertical support mechanism 52 is connected to the walking jack 513 and moves forward along the slideway 511 through the walking jack 513.

[0058] The vertical support mechanism includes support columns 521, diagonal support columns 522, connection systems 523, distribution beams 524, Bailey trusses 525, jacking jacks 526, and counterweight blocks 528. A number of support columns 521 are installed in rows on the bottom cross beam 512. The diagonal support columns 522 are installed on the left and right support columns 521. The adjacent support columns 521 and between the support columns 521 and the diagonal support columns 522 are all connected through the connection systems 523. The jacking jacks 526 are installed on the tops of the support columns 521 and the diagonal support columns 522. The distribution beams 524 are installed on the tops of the jacking jacks 526. The Bailey trusses 525 are installed on the tops of the distribution beams 524. The bottom formwork system 527 for the upper beam is installed on the tops of the Bailey trusses 525. The counterweight blocks 528 are installed on the tops of the Bailey trusses 525 and are pressed by the already completed upper beam 3.

[0059] The upper beam bottom formwork system 527 is raised and lowered by the lifting jack 526, and the back pressure block 528 supports the cast upper beam 3 sections to prevent the structure from overturning.

[0060] The cantilever support mechanism 53 is installed on the vertical support mechanism 52 and is used for the construction of the lower beam 2 segment. A lower beam bottom formwork system 532 that can be raised or lowered is provided on the cantilever support mechanism 53.

[0061] The cantilever support mechanism includes a bracket 531, a through-type tensioning jack 533, and a steel strand bundle 534; the bracket 531 is installed on the support column 521 on the front side of the vertical support mechanism 52, a pair of through-type tensioning jacks 533 are installed on the left and right ends of the top of the bracket 531 away from the support column 521, and another pair of through-type tensioning jacks 533 are installed on the left and right ends of the top of the bottom cross beam 512 close to the bracket 531, and the lower beam bottom formwork system 532 is fixed by the through-type tensioning jacks 533 and the steel strand bundle 534, and one end of the top of the lower beam bottom formwork system 532 is abutted against the bottom of the completed lower beam 2.

[0062] The bracket 531 and the support column 512 are connected as a whole through a pin shaft. The bracket 531 is triangular, and the lower beam bottom template system 532 is raised and lowered by a through-type tensioning jack 533.

[0063] The 2# segment of the lower beam 2 is constructed on the lower beam bottom formwork system 532, and the 1# segment of the upper beam 3 is constructed on the upper beam bottom formwork system 527. After the construction is completed, the lower beam bottom formwork system 532 and the upper beam bottom formwork system 527 are removed, and then the slideway 511 is connected to the completed segment of the lower beam 2, and the vertical support mechanism 52 is moved forward by a segment distance under the action of the walking jack 513;

[0064] Step 3: Repeat step 2 to continue cantilever construction, construct the subsequent sections of the upper beam 3 and the lower beam 2. At the same time, install the reinforcing truss 6 to connect the lower beam 2 and the upper beam 3 that have been cast as a whole, improve the strength of the two, resist the unbalanced bending moment, ensure that the structure is not damaged during the cantilever construction process, and the construction of the lower beam 2 section is one section ahead of the upper beam 3;

[0065] Specifically, after the vertical support mechanism 52 stops, the upper beam bottom formwork system 527 is lifted under the action of the jacking jack 526 until the counterweight block 528 abuts against the completed upper beam 3 segment. The counterweight block 528 can prevent the structure from tipping over. The lower beam bottom formwork system 532 is lifted under the action of the through-tensioning jack 533 until it abuts against the completed lower beam 2 segment. After the upper beam bottom formwork system 527 and the lower beam bottom formwork system 532 are fixed, the construction of the upper beam 3 segment and the lower beam 2 segment begins. After the construction is completed, the upper beam bottom formwork system 527 and the lower beam bottom formwork system 532 are lowered. Then, the slideway 511 is extended, and the walking support 5 moves forward by one segment. By repeating this process, the subsequent segments of the upper beam 3 and the lower beam 2 can be constructed. During this period, the construction of the lower beam 2 segment always leads the upper beam 3 by one segment.

[0066] Compared with the method of erecting a support on the lower beam 2 and then constructing the upper beam 3 on the support, the overall formwork system is convenient for movement, without the need to erect a large number of supports and formworks. After the construction is completed, the lower beam 2 and the upper beam 3 are directly connected into a whole by installing the finished strengthening truss 6, which improves the strength of the two, resists the unbalanced bending moment, and ensures that the structure is not damaged during the cantilever construction process. The overall construction difficulty is low and the efficiency is high.

[0067] Step Four: The walking support 5 gradually moves forward to the pier 1 to construct the last segment of the lower beam 2 and the corresponding segment of the upper beam 3.

[0068] Step Five: Remove the cantilever support mechanism 53, continue to move the vertical support mechanism 52 forward, and construct the last segment of the upper beam 3.

[0069] Step Six: Remove the walking support 5, the strengthening truss 6, and the temporary anchor 4 to complete the construction of the entire bridge.

[0070] The present invention uses the walking support 5 to realize the synchronous cantilever casting construction of the double-layer cast-in-place beam, with high construction efficiency, avoiding the erection of ground supports on land or water, which affects the traffic under the bridge or water navigation, and does not affect water navigation or traffic under the bridge.

[0071] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0072] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A synchronous construction method for the upper beam and the lower beam of a double-deck bridge for both public and rail use, characterized in that, The double - deck bridge for both public and rail use includes bridge piers (1), lower - layer girders (2), and upper - layer girders (3). The construction facilities include temporary anchorages (4), walkable supports (5), and strengthening trusses (6). A support girder (7) is provided between each pair of bridge piers (1). The lower - layer girders (2) and upper - layer girders (3) are divided into several segments, and the pouring construction is carried out symmetrically from the middle to both ends in the following steps: Step 1: Symmetrically construct the 0# and 1# segments of the lower - layer girder (2) and the 0# segment of the upper - layer girder (3); The temporary anchorage (4) includes the lower - layer girder temporary anchorage (41) and the upper - layer girder temporary anchorage (42). Temporary supports are erected on both sides of the already - constructed bridge piers (1). The lower - layer girder temporary anchorage (41) is arranged on the support girder (7), and the 0# and 1# segments of the lower - layer girder (2) are symmetrically constructed. After curing, a temporary support is erected on the 0# segment of the lower - layer girder (2), the upper - layer girder temporary anchorage (42) is arranged, and the 0# segment of the upper - layer girder (3) is constructed. After curing, the temporary support is removed. Among them, the 0# segment of the lower - layer girder (2) is fixed to the support girder (7) through the lower - layer girder temporary anchorage (41), and the 0# segment of the upper - layer girder (3) is fixed to the top of the bridge pier (1) through the upper - layer girder temporary anchorage (42); Step 2: Symmetrically install the walkable support (5) and construct the 2# segment of the lower - layer girder (2) and the 1# segment of the upper - layer girder (3); The walkable support (5) includes a sliding support mechanism (51), a vertical support mechanism (52), and a cantilever support mechanism (53); The sliding support mechanism (51) includes a slideway (511), a bottom cross - beam (512), and a walking jack (513). The slideway (511) is installed on the already - poured lower - layer girder (2), and both the bottom cross - beam (512) and the walking jack (513) are slidably installed on the slideway (511); The vertical support mechanism (52) is installed on the bottom cross - beam (512) for the construction of the upper - layer girder (3) segments. And an elevating bottom formwork system (527) for the upper - layer girder is provided on the vertical support mechanism (52). The vertical support mechanism (52) is connected to the walking jack (513) and moves forward along the slideway (511) under the action of the walking jack (513); The cantilever support mechanism (53) is installed on the vertical support mechanism (52) for the construction of the lower - layer girder (2) segments. And a lowering bottom formwork system (532) for the lower - layer girder is provided on the cantilever support mechanism (53); Construct the 2# segment of the lower - layer girder (2) on the lower - layer girder bottom formwork system (532) and construct the 1# segment of the upper - layer girder (3) on the upper - layer girder bottom formwork system (527). After construction, the lower - layer girder bottom formwork system (532) and the upper - layer girder bottom formwork system (527) are lowered, and then the slideway (511) is lengthened. The vertical support mechanism (52) moves forward a segment distance under the action of the walking jack (513); Step 3: Repeat Step 2 to continue cantilever construction for the subsequent segments of the upper - layer girder (3) and the lower - layer girder (2). At the same time, install the strengthening truss (6) to connect the already - poured lower - layer girder (2) and upper - layer girder (3) into a whole. The construction of the lower - layer girder (2) segments leads the upper - layer girder (3) by one segment; Step 4: The walkable support (5) is gradually moved forward to the bridge pier (1) to construct the last segment of the lower beam (2) and the corresponding segment of the upper beam (3); Step 5: dismantle the cantilever support mechanism (53), continue to move the vertical support mechanism (52) forward, and construct the last section of the upper beam (3); Step 6: Remove the walkable support (5), reinforced truss (6), and temporary anchor (4) to complete the construction of the entire bridge.

2. A synchronous construction method for the upper beam and the lower beam of a dual-purpose public-rail double-deck bridge according to claim 1, characterized in that In step 2, the vertical support mechanism includes a support column (521), a diagonal support column (522), a connection system (523), a distribution beam (524), a Bailey truss (525), a lifting jack (526), and a counter-pressure block (528).

3. A synchronous construction method for the upper beam and the lower beam of a dual-purpose public-rail double-deck bridge according to claim 2, characterized in that A plurality of support columns (521) are installed in a row on the bottom cross beam (512), the diagonal bracing columns (522) are installed on the support columns (521) on the left and right sides, and the two adjacent support columns (521) and the support columns (521) and the diagonal bracing columns (522) are connected by a connecting system (523). A lifting jack (526) is installed on the top of the support column (521) and the diagonal bracing column (522), a distribution beam (524) is installed on the top of the lifting jack (526), a Bailey truss (525) is installed on the top of the distribution beam (524), an upper beam bottom formwork system (527) is installed on the top of the Bailey truss (525), and a counterpressure block (528) is installed on the top of the Bailey truss (525) and is pressed by the completed upper beam (3).

4. A synchronous construction method for the upper beam and the lower beam of a dual-purpose public-rail double-deck bridge according to claim 3, characterized in that, In step 2, the cantilever support mechanism includes a bracket (531), a through-type tensioning jack (533), and a steel strand harness (534).

5. A synchronous construction method for the upper beam and the lower beam of a dual-purpose public-rail double-deck bridge according to claim 4, characterized in that, The bracket (531) is mounted on the support column (521) on the front side of the vertical support mechanism (52), a pair of through-type tensioning jacks (533) are mounted on the left and right ends of the top of the bracket (531) away from the support column (521), and another pair of through-type tensioning jacks (533) are mounted on the left and right ends of the top of the bottom cross beam (512) close to the bracket (531), the bottom formwork system (532) of the lower beam is fixed by the through-type tensioning jacks (533) and the steel strand bundle (534), and one end of the top of the bottom formwork system (532) of the lower beam is abutted against the bottom of the completed lower beam (2).

6. A synchronous construction method for the upper beam and the lower beam of a dual-purpose public-rail double-deck bridge according to claim 5, characterized in that, The upper beam bottom formwork system (527) is raised and lowered by a lifting jack (526), and the lower beam bottom formwork system (532) is raised and lowered by a through-type tensioning jack (533).

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