Temporary consolidation structure for beam bodies of adjacent middle-connected side span cast-in-place sections of multi-connected continuous beam

Abstract

The utility model provides a temporary consolidation structure for a beam body of an adjacent middle-connected side span cast-in-place section of a multi-connected continuous beam, and relates to the technical field of construction of the multi-connected continuous beam across complex terrain areas such as rivers and canals, the consolidation structure comprises pier beam consolidation sections, suspension casting sections, upper tension bundles, lower tension bundles and pre-stress bundles, and through the temporary consolidation suspension casting construction mode of the beam body, the pre-stress bundles and the middle-connected side span cast-in-place section of the multi-connected continuous beam are formed. The design is reasonable, construction is easy, the using effect is good, temporary consolidation is conducted through an upper tensioning bundle, a lower tensioning bundle and a pre-stress bundle, hanging basket construction is adopted for all suspended pouring sections, after full-bridge closure is conducted, temporary consolidation is relieved, system conversion is completed, and the problems that a multi-connected continuous beam crosses complex terrain areas such as rivers, canals and valleys, side span cast-in-place supports are difficult to construct, and the construction cost is low are effectively solved. And the construction risk is high.

Description

Technical Field

[0001] The utility model relates to the technical field of construction of multiple-joint continuous beams across rivers, canals and other areas with complex terrain, and in particular to a temporary consolidation structure of cast-in-place beam bodies of adjacent middle-joint side spans of multiple-joint continuous beams. Background Art

[0002] For continuous beams with multiple cantilever cast-in-place construction, in the past construction process, the cast-in-place beam sections of adjacent side spans usually adopt the single-end tensioning method of cast-in-place on brackets. However, with the continuous development of economic construction and transportation, as well as the increasing scale of bridge projects, people's requirements for the use of bridges are also constantly increasing. Especially in complex terrain areas such as crossing rivers, canals, and valleys, this traditional construction technology can no longer meet the growing high-standard requirements. Therefore, it is urgent to explore and develop new bridge engineering construction technologies to meet the requirements of modern engineering. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a temporary consolidation structure for the cast-in-place sections of the adjacent middle and side spans of a multi-unit continuous beam.

[0004] A temporary consolidation structure for the cast-in-place sections of adjacent middle-joint side spans of a multi-joint continuous beam comprises: pier-beam consolidation and a cantilevered segment, wherein the pier-beam consolidation and the cantilevered segment are connected, an upper tensioning beam is arranged on the top of the cantilevered segment, a lower tensioning beam is arranged on the bottom of the cantilevered segment, a middle partition is also arranged on the cantilevered segment, a prestressed beam is horizontally arranged on the middle partition, a supporting steel plate is also arranged on the middle partition, and the supporting steel plate is perpendicular to the prestressed beam.

[0005] Furthermore, the consolidation structure also includes a hardwood block, which is arranged on the middle partition and connected to the supporting steel plate.

[0006] Furthermore, the prestressed beam includes a first force beam, a second force beam, a third force beam and a fourth force beam, and the first force beam, the second force beam, the third force beam and the fourth force beam are longitudinally arranged in sequence on the middle partition.

[0007] Furthermore, the first force bundle, the second force bundle, the third force bundle and the fourth force bundle each include a plurality of threaded steel bars.

[0008] Furthermore, the cross-sectional diameter of the threaded steel bar is 25 mm.

[0009] Furthermore, the upper tensioning bundle includes a plurality of steel strands.

[0010] Furthermore, the lower tensioning bundle includes a plurality of steel strands.

[0011] Furthermore, the spacing distance between the first force beam and the second force beam is 80 mm.

[0012] Furthermore, the interval distance between the third force beam and the fourth force beam is 50 mm.

[0013] Furthermore, the spacing distance between the first force beam and the top of the suspended casting segment is 155 mm.

[0014] The technical solution of the utility model has the following advantages:

[0015] In the technical solution provided by the utility model, a method of suspended casting by temporary consolidation of the beam body is adopted, which has reasonable design, simple construction and good use effect. The common side piers of the cast-in-place sections of adjacent middle-joined side spans are located in the river (channel, valley), and the No. 0 blocks of the adjacent side span cast-in-place beam sections are constructed by bracket cast-in-place, and are temporarily consolidated by upper tensioning beams, lower tensioning beams and prestressed beams. Each suspended casting section is constructed by hanging basket. After the whole bridge is closed, the temporary consolidation is released to complete the system conversion, which effectively solves the problem of difficult construction of cast-in-place brackets for side spans and high construction risks in areas with complex terrain such as rivers, channels and valleys caused by multi-joint continuous beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the supporting steel plate, hardwood block and prestressed bundle structure of the utility model.

[0019] Description of reference numerals:

[0020] 1- pier-beam consolidation; 2- cast-in-place segment; 3- upper tensioning beam; 4- lower tensioning beam; 5- supporting steel plate; 6- hardwood block; 7- prestressed beam. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1 and Figure 2 A temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-unit continuous beam is shown, comprising: a pier-beam consolidation 1 and a cantilevered segment 2, wherein the pier-beam consolidation 1 and the cantilevered segment 2 are connected, an upper tensioning beam 3 is arranged on the top of the cantilevered segment 2, a lower tensioning beam 4 is arranged on the bottom of the cantilevered segment 2, a middle partition is also arranged on the cantilevered segment 2, and the portion connecting the top and the bottom of the cantilevered segment 2 is the middle partition, a prestressed beam 7 is horizontally arranged on the middle partition, a supporting steel plate 5 is also arranged on the middle partition, and the supporting steel plate 5 is perpendicular to the prestressed beam 7, and the pier-beam consolidation 1 is used to temporarily consolidate the cantilevered segment 2 and the pier top.

[0026] The temporary consolidation structure of the beam body of the adjacent middle side span cast-in-place sections of the above-mentioned multi-span continuous beam is constructed by temporary consolidation of the beam body through cantilever casting. It has reasonable design, simple construction and good use effect. The common side pier of the cast-in-place sections of the adjacent middle side spans is located in the river (channel, valley). The adjacent side span cast-in-place beam section block No. 0 is constructed by bracket cast-in-place, and is temporarily consolidated by upper tensioning beam 3, lower tensioning beam 4 and prestressed beam 7. Each cantilevered section 2 is constructed by hanging basket. After the whole bridge is closed, the temporary consolidation is released to complete the system conversion, which effectively solves the problem of difficult construction of cast-in-place brackets for side spans and high construction risks in multi-span continuous beams crossing rivers, channels, valleys and other complex terrain areas.

[0027] like Figure 1 and Figure 2 As shown, in this embodiment, the consolidation structure also includes hardwood blocks 6, which are arranged on the middle partition and connected to the supporting steel plate 5; the hardwood blocks 6 and the supporting steel plate 5 are filled on the middle partition to ensure the stability of the consolidation structure during the construction process, and at the same time ensure that the size of the beam joints after the temporary prestressing of the upper tensioning bundle 3, the lower tensioning bundle 4 and the prestressed bundle 7 is released meets the requirements.

[0028] like Figure 1 and Figure 2 As shown, in this embodiment, the prestressed beam 7 includes a first force beam, a second force beam, a third force beam and a fourth force beam, and the first force beam, the second force beam, the third force beam and the fourth force beam are longitudinally arranged in sequence on the middle partition; and the first force beam, the second force beam, the third force beam and the fourth force beam are all composed of a plurality of threaded steel bars, and the cross-sectional diameter of the threaded steel bars is 25 mm; the spacing distance between the first force beam and the second force beam is 80 mm; the spacing distance between the third force beam and the fourth force beam is 50 mm; the spacing distance between the first force beam and the top end of the cantilevered segment 2 is 155 mm; the spacing distance between the fourth force beam and the bottom end of the cantilevered segment 2 is 155 mm; through the arrangement of the first force beam, the second force beam, the third force beam and the fourth force beam, it is ensured that the adjacent side span cast-in-place section No. 0 beam section is a whole, and at the same time, a temporary tensioning force is provided for the consolidation structure.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, the upper tensioning bundle 3 includes multiple steel strands, and the lower tensioning bundle 4 includes multiple steel strands. The upper tensioning bundle 3 and the lower tensioning bundle 4 are both composed of steel strand bundles. The upper tensioning bundle 3 and the lower tensioning bundle 4 are used for temporary tensioning to provide temporary tensioning force.

[0030] like Figure 1 and Figure 2 As shown, in this embodiment, the specific construction steps for the temporary consolidation structure of the cast-in-place beam body of the adjacent middle and side spans of the multi-joint continuous beams are as follows:

[0031] Step 1: First, install the side pier top support, temporarily consolidate the construction pier beam, and connect the pier beam consolidation 1 and the suspended cast segment 2;

[0032] Step 2: When constructing the suspended cast segment 2 of the pier top beam, use the bracket installed on the top of the common side pier to install the suspended cast segments 2 of the two adjacent pier top beams on the top of the same side pier;

[0033] Step 3: embed the supporting steel plate 5, hardwood block 6, upper tensioning beam 3, lower tensioning beam 4 and prestressed beam 7 between the beam bodies on the suspended cast segment 2;

[0034] Step 4: After pouring concrete on the suspended cast segment 2, the middle partition is temporarily tensioned by using the upper tensioning beam 3, the lower tensioning beam 4 and the prestressed beam 7;

[0035] Step 5: Install the hanging basket cantilever to cast the remaining segments. The upper tension beams 3 corresponding to the No. 0 beam segment and each "T" structure cantilevered beam segment are LST0-LSTN respectively. Tension LST0-LSTN and the first force beam, the second force beam, the third force beam and the fourth force beam are tensioned in sequence. Grouting is not allowed after tensioning to facilitate later construction. Grouting is performed after the upper tension beam 3, the first force beam, the second force beam, the third force beam and the fourth force beam are removed;

[0036] Step six, after the whole bridge is connected, release the temporary prestress in batches. The first force bundle, the second force bundle, the third force bundle and the fourth force bundle should be removed first, and then the upper tension bundle 3LST0~LSTN should be released in batches. The release order is LST0~LSTN prestressed steel bundles. At the same time, take measures such as strengthening monitoring to prevent the steel bundles from bursting out.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A temporary consolidation structure for the cast-in-place sections of adjacent middle and side spans of a multi-joint continuous beam, comprising: The pier-beam consolidation (1) and the cantilevered segment (2) are characterized in that the pier-beam consolidation (1) and the cantilevered segment (2) are connected, an upper tensioning beam (3) is arranged at the top of the cantilevered segment (2), a lower tensioning beam (4) is arranged at the bottom of the cantilevered segment (2), a middle partition is also arranged on the cantilevered segment (2), a prestressed beam (7) is horizontally arranged on the middle partition, a supporting steel plate (5) is also arranged on the middle partition, and the supporting steel plate (5) is perpendicular to the prestressed beam (7).

2. A temporary consolidation structure for the cast-in-place sections of adjacent middle and side spans of multi-link continuous beams according to claim 1, characterized in that: The consolidation structure further comprises a hardwood block (6), which is arranged on the middle partition plate and connected to the supporting steel plate (5).

3. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 1, characterized in that: The prestressed bundle (7) comprises a first bundle, a second bundle, a third bundle and a fourth bundle, and the first bundle, the second bundle, the third bundle and the fourth bundle are longitudinally arranged in sequence on the middle partition.

4. A temporary consolidation structure for the cast-in-place sections of adjacent middle and side spans of multi-link continuous beams according to claim 3, characterized in that: The first force bundle, the second force bundle, the third force bundle and the fourth force bundle all include a plurality of threaded steel bars.

5. A temporary consolidation structure for the cast-in-place sections of adjacent middle and side spans of multi-link continuous beams according to claim 4, characterized in that: The cross-sectional diameter of the threaded steel bar is 25 mm.

6. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 1, characterized in that: The upper tensioning bundle (3) comprises a plurality of steel strands.

7. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 1, characterized in that: The lower tensioning bundle (4) comprises a plurality of steel strands.

8. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 3, characterized in that: The spacing distance between the first force beam and the second force beam is 80 mm.

9. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 3, characterized in that: The spacing distance between the third force beam and the fourth force beam is 50 mm.

10. The temporary consolidation structure of the adjacent middle and side span cast-in-place sections of a multi-link continuous beam according to claim 3, characterized in that: The spacing distance between the first force beam and the top of the suspended casting segment (2) is 155 mm.

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