A continuous beam bridge with no span cast-in-situ combined girder segment swivel construction method

Abstract

The application provides a kind of no edge span cast-in-situ combined girder continuous beam bridge swivel construction method, comprising the following steps: before swivel, the swivel beam with the length equal to the length of bridge is manufactured, and according to the beam end deflection value of the edge pier support jacking and the beam bottom elevation data, the actual elevation of the edge pier support cushion top is calculated in combination with the design elevation of the main pier position support cushion stone top, so as to pour the edge pier support cushion stone; then the swivel beam swivel construction is carried out, and after the swivel is completed, the swivel beam is dropped to the edge pier and the main pier permanent support. The application can make the swivel beam without cast-in-situ combined girder, avoid the influence of the edge span cast-in-situ segment construction on the operation and safety of the existing railway, highway and other structures under the bridge, and also reduce the construction process of the bridge after swivel; at the same time, the construction of the edge pier support cushion stone can be completed before swivel, and the bridge is directly formed after swivel, which avoids the construction of the support cushion stone after swivel, and solves the problems of difficult operation, difficult to guarantee the construction quality, large error between the support reaction and the design value and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge construction, and particularly relates to a continuous beam bridge swivel construction method without side span cast-in-situ closure segment. BACKGROUND

[0002] With the continuous development of domestic traffic network, more and more overline viaducts appear. In order to reduce the influence of construction on the operation and safety of the existing traffic under the viaduct, for the bridge crossing the busy traffic road, the swivel construction method has been widely applied.

[0003] In the bridge swivel construction, the upper beam body will produce a certain deflection in the swivel cantilever state. If the swivel length of the beam body is equal to the bridge length, the deflection will cause the conflict between the beam end and the side pier support or support cushion stone. If the swivel beam span is large, the deflection will even cause the conflict between the beam body and the side pier cap beam, and the smooth swivel cannot be realized. At present, in order to solve the above problems, there are two design and construction methods for the overline continuous beam bridge in the swivel construction, which are as follows.

[0004] One method is to design the swivel length of the beam body to be less than the bridge length. After the swivel is in place, a certain length of cast-in-situ closure segment is arranged near the side pier, and the bridge span is completed by the way of casting the closure segment on site. At present, this way is the most commonly used scheme. Its advantages are that the side pier support can have a certain counterforce after the construction is completed, so that the structure does not have the phenomenon of side support disengagement in the operation and use stage; and the disadvantage is that the construction of the cast-in-situ closure segment needs to set up cast-in-situ support, and the cast-in-situ support on the overline side is adjacent to the bridge understructure. The construction will have a great influence on the operation and safety of the bridge understructure.

[0005] Another method is to design the swivel length of the beam body to be equal to the bridge length, but the side pier support, support cushion stone or cap beam is not constructed, and the swivel space is left. After the beam body is swiveled and constructed in place, the support, support cushion stone or cap beam and other components at the side span beam end are constructed by jacking up the beam body. This way can realize the construction without cast-in-situ closure segment, and can also make the side pier support have a certain counterforce reserve. However, this method needs to cast the side span support cushion stone or cap beam under the beam body after swivel and install the support. The construction space is limited, the operation is difficult, the construction quality is difficult to guarantee, and the error of the support counterforce from the design value is large. SUMMARY

[0006] The purpose of the present application is to provide a continuous beam bridge swivel construction method without side span cast-in-situ closure segment, which can at least solve some defects in the prior art.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0008] A continuous beam bridge swivel construction method without side span cast-in-situ closure segment comprises the following steps:

[0009] 1) Construct the spherical hinge assembly and the main pier support assembly at the top of the main pier;

[0010] 2) A dynamic balancing system for the rotation of the main pier top, or an auxiliary support is set under the rotating beam at the middle position of the side span;

[0011] 3) The rotating beam is manufactured at the prefabrication position before the rotation, and the length of the rotating beam is equal to the length of the completed bridge. The side span cap beams are constructed at the same time.

[0012] 4) After the rotating beam is manufactured, before rotating it, jacks are installed at the bridge bearing positions at the ends of the rotating beam to lift the beam. The lifting force is the design value F of the bearing reaction force at the side piers when the bridge is completed, and the deflection Δ at the end of the rotating beam is measured. Then, the jacks are removed, and the bottom elevation H of the beam at the side pier bearing positions and the permanent bearing positions of the main pier is measured. 边 and H 中 ;

[0013] 5) Based on the measured deflection at the end of the rotating beam and the elevation data of the bottom of the beam, and combined with the design elevation T of the top of the permanent support pad of the main pier at the main pier location. 中 The actual elevation of the top of the bearing pad stone at the side pier is calculated to be T. 边 =H 边 -d h -t 边 +Δ, where d h d represents the drop height of the rotating beam. h =H 中 -T 中 -t 中 , t 边 and t 中 These refer to the heights of the side pier supports and the permanent supports of the main pier, respectively.

[0014] 6) Based on the T calculated above 边 The value is that the construction side pier support pad stone is poured at the top of the side pier to the actual elevation, and the side pier support is installed.

[0015] 7) Carry out the rotation construction of the rotating beam;

[0016] 8) After the rotation is completed, the dynamic balancing system of the rotation is removed. At the same time, jacks are set on the top of the main pier to support the beam. The rotating ball hinge assembly is removed so that the rotating beam is placed on the permanent supports of the main pier and the side pier, thus completing the system conversion.

[0017] Furthermore, the rotating ball joint assembly includes a ball joint base and a support-type rotating ball joint disposed on the ball joint base, and the main pier support assembly includes a main pier permanent support pad stone and a main pier permanent support disposed on the main pier permanent support pad stone.

[0018] Further, in the step 1), when the construction of the swivel spherical hinge assembly and the main pier support assembly is carried out, the height of the spherical hinge base is adjusted, so that the top surface height of the support swivel spherical hinge is higher than the top surface height of the permanent support of the main pier, and the height difference between the top surface of the support swivel spherical hinge and the top surface of the permanent support of the main pier is greater than the deflection value of the swivel beam end.

[0019] Further, the height difference between the top surface of the support swivel spherical hinge and the top surface of the permanent support of the main pier is 10-20 cm greater than the deflection value of the swivel beam end.

[0020] Further, the power balance system comprises a rotating table, a support leg, a slide, a counterforce base and a traction cable, the rotating table is fixed to the beam bottom of the swivel beam and supported on the top of the main pier through the support leg, the bottom of the support leg is slidingly connected to the slide, the counterforce base is arranged on the top of the main pier, and the counterforce base drives the rotating table to rotate through the traction cable.

[0021] Further, the auxiliary support comprises an auxiliary support leg, an arc-shaped track and a driving mechanism, the arc-shaped track extends in the swivel direction of the swivel beam from the prefabricated position before swivel to the bridge completion position, the top of the auxiliary support leg supports the swivel beam, and the auxiliary support leg is driven to move along the arc-shaped track through the driving mechanism.

[0022] Further, in the step 3), the swivel beam is manufactured by erecting a support and casting in situ or by using a hanging basket to suspend and cast.

[0023] Compared with the prior art, the method has the following beneficial effects:

[0024] (1) The swivel construction method of the continuous beam bridge without side span cast-in-situ closure segment provided by the application can make the swivel beam without cast-in-situ closure segment, and the bridge is completed after the swivel beam is lowered, thereby avoiding the influence of the construction of the side span cast-in-situ segment on the operation and safety of the existing railway, highway and other structures under the bridge, reducing the construction process of the bridge after swivel and shortening the construction period.

[0025] (2) Compared with the construction method of the cast-in-situ closure segment without cast-in-situ closure segment of the post-cast support cushion stone, the construction of the permanent support on the top of the side pier and the support cushion stone can be completed before swivel, and the bridge is directly completed after the swivel beam is lowered, thereby avoiding the construction of the support cushion stone after swivel, and solving the problems of difficult operation, difficult guarantee of construction quality and large error between the support counterforce and the design value.

[0026] (3) The swivel construction method of the continuous beam bridge without side span cast-in-situ closure segment can accurately control the counterforce value at the support of the two side piers after the conversion of the swivel continuous beam system, and guarantee the safety of the structure under stress after the conversion of the swivel bridge system.

[0027] The application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a turning plane diagram of the invention in which a dynamic balance system is arranged on the top of the main pier of the turning beam;

[0029] Figure 2 is a turning plane diagram of the invention in which an auxiliary support is arranged on the side span;

[0030] Figure 3 is a turning plane diagram of the invention in which the turning beam is manufactured and the end of the turning beam is jacked up;

[0031] Figure 4 is a turning beam turning posture diagram of the invention in which a dynamic balance system is arranged on the top of the main pier of the turning beam;

[0032] Figure 5 is a turning beam turning posture diagram of the invention in which an auxiliary support is arranged on the side span;

[0033] Figure 6 is a turning beam falling diagram of the invention in which the turning beam is manufactured and the end of the turning beam is jacked up;

[0034] Figure 7 is a turning beam turning posture diagram of the invention in which a dynamic balance system is arranged on the top of the main pier of the turning beam;

[0035] Figure 8 is a main pier top dynamic balance system plane arrangement diagram of the invention;

[0036] Figure 9 is a turning beam turning posture diagram of the invention in which an auxiliary support is arranged on the side span;

[0037] Figure 10 is a main pier cross section diagram of the invention in which the dynamic balance system is removed after the turning;

[0038] Figure 11 is a main pier cross section diagram of the invention in which the turning ball hinge assembly is removed after the turning;

[0039] Figure 12 is a main pier cross section diagram of the invention in which the turning beam is returned after the turning;

[0040] Figure 13 is a main pier cross section diagram of the invention after the turning bridge is formed.

[0041] BRIEF DESCRIPTION OF DRAWINGS 1. Main pier; 2. Turning beam; 3. Side pier; 4. Arc-shaped track; 5. Auxiliary support leg; 6. Jack; 7. Ball hinge base; 8. Turning ball hinge; 9. Side pier support; 10. Turntable; 11. Counterforce base; 12. Main pier permanent support; 13. Main pier permanent support cushion stone; 14. Support foot; 15. Slide; 16. Traction cable. DETAILED DESCRIPTION

[0042] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in the description of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or abutting connection or integral connection; for those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances; in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] The embodiment provides a continuous beam bridge swivel construction method of a no-boundary-span cast-in-situ splicing segment, and specifically comprises the following steps:

[0046] (1) First, the design and construction of the lower foundation and the pier are carried out according to the conventional bridge, and this construction process is the prior art, and the specific operation is not described here; then, the swivel spherical hinge assembly and the main pier support assembly are constructed at the position of the top of the main pier.

[0047] The swivel spherical hinge assembly comprises a spherical hinge base 7 and a support type swivel spherical hinge 8 arranged on the spherical hinge base 7, and the main pier support assembly comprises a main pier permanent support cushion stone 13 and a main pier permanent support 12 arranged on the main pier permanent support cushion stone 13. When the swivel spherical hinge assembly and the main pier support assembly are constructed, the height of the spherical hinge base 7 is adjusted, so that the top surface elevation of the support type swivel spherical hinge 8 (i.e. the bottom elevation of the swivel beam) is higher than the top surface elevation of the main pier permanent support 12, and the height difference between the top surface of the support type swivel spherical hinge 8 and the top surface of the main pier permanent support 12 is greater than the end deflection value of the swivel beam and has an appropriate surplus (generally 10cm-20cm), which not only ensures that the bottom elevation of the beam end of the swivel beam 2 in the cantilever state before swiveling is higher than the top elevation of the pre-set side pier support 9, so that the swiveling is not hindered, but also ensures that the space between the bottom of the swivel beam 2 and the top of the main pier 1 can meet the space height requirement of the construction operation of the construction personnel.

[0048] (2) A dynamic balancing system for the rotation of the main pier at the top of pier 1 provides power for the subsequent rotation of the rotating beam. Specifically, such as... Figure 1 , Figure 4 , Figure 7 and Figure 8 As shown, the dynamic balancing system includes a turntable 10, support legs 14, slide rails 15, reaction seats 11, and traction cables 16 arranged on the top of the main pier. The turntable 10 is supported on the top of the main pier by the support legs 14, and the bottom of the support legs 14 is slidably connected to the slide rails 15. The reaction seats 11 are set on the top of the main pier and the reaction seats 11 pull the turntable 10 to rotate through the traction cables 16, thereby providing power for the rotation of the rotating beam 2. During the rotation process, the support legs 14 and slide rails 15 can effectively prevent the rotating structure from overturning.

[0049] Alternatively, instead of installing a dynamic balancing system at the top of the main pier 1, an auxiliary support can be installed at a suitable location in the middle of the side span, below the rotating beam 2; specifically, as shown below... Figure 2 , Figure 5 and Figure 9 As shown, the auxiliary support includes auxiliary legs 5, an arc-shaped track 4, and a drive mechanism. The arc-shaped track 4 extends from the prefabricated position before the rotation to the completed bridge position in the rotation direction of the rotating beam 1. The top of the auxiliary legs 5 supports the rotating beam 2 and drives it to move along the arc-shaped track 4 through the drive mechanism, thereby providing power for the rotation of the rotating beam 2.

[0050] (3) The rotating beam 2 is manufactured in the prefabrication position before the rotation by erecting a support and casting in place or by using a hanging basket for cantilever casting. The length of the rotating beam 2 is equal to the length of the completed bridge. No length of the cast-in-place closure section is set, and the side span cap beam is constructed at the same time.

[0051] (4) After the rotating beam 2 is manufactured, before rotating it, first install jacks 6 at the end of the bridge support of the rotating beam 2 to lift the beam body, such as... Figure 3 As shown, the lifting force is designed to be the design value F of the support reaction force at the side pier 3 when the bridge is completed, and the upward deflection Δ at the end of the rotating beam 2 is measured at this time; then the jack 6 is removed, and the bottom elevation data H of the beam at the side pier support 9 and the main pier permanent support 12 of the rotating beam 2 are measured. 边 and H 中 .

[0052] (5) Based on the measured deflection value at end 2 of the rotating beam and the elevation data of the bottom of the beam, and combined with the design elevation T of the top of the permanent support pad stone of the main pier at the location of main pier 1, 中 The actual elevation of the top of the bearing pad stone at the three side piers was calculated to be T. 边 =H 边 -d h -t 边+ Δ, wherein, d h is the height value of the falling of the rotating beam, d h = H 中 -T 中 -t 中 , t 边 and t 中 are the height of the side pier support and the permanent support of the main pier respectively.

[0053] (6) According to the calculated T 边 value, the side pier support cushion stone is poured and constructed at the top of the side pier 3 to the actual elevation, and the side pier support is installed.

[0054] (7) The support or hanging basket for manufacturing the rotating beam 2 is removed, and the rotating beam 2 is rotated by using the dynamic balance system or auxiliary support.

[0055] (8) After the rotation is completed, as shown in Figure 6 , Figure 10 , Figure 11 , Figure 12 and Figure 13 , the dynamic balance system of the rotation is removed, the jack 6 is arranged at the top of the main pier 1 to support the rotating beam 2, the rotating spherical hinge 8 and the spherical hinge base 7 are removed, the rotating beam 2 is fallen to the permanent support of the main pier and the side pier, the system conversion is completed, the bridge surface auxiliary facilities are constructed, and the bridge state is formed.

[0056] The continuous beam bridge rotation construction method provided by the present application can make the rotating beam without the cast-in-situ closure segment, the bridge after the rotation is fallen, the influence of the construction of the cast-in-situ segment on the operation and safety of the existing railway, highway and other structures under the bridge is avoided, the construction process of the bridge after the rotation is reduced, and the construction period is shortened; compared with the cast-in-situ closure segment construction method of the post-cast support cushion stone, the construction of the permanent support at the top of the side pier and the support cushion stone can be completed before the rotation, the bridge is directly fallen after the rotation, the construction of the support cushion stone after the rotation is avoided, the operation is difficult, the construction quality is difficult to guarantee, the support reaction force has a large error with the design value, and the like.

[0057] The above examples are only illustrative of the present application and do not constitute a limitation on the protection scope of the present application, and any design identical or similar to the present application belongs to the protection scope of the present application.

Claims

1. A method for the construction of a continuous girder bridge with no span cast-in-situ combined closure segment swivel, characterized in that, The method comprises the following steps: 1) constructing a swivel spherical hinge assembly and a main pier support assembly at the position of the top of the main pier; wherein the swivel spherical hinge assembly comprises a spherical hinge base and a support type swivel spherical hinge arranged on the spherical hinge base, and the main pier support assembly comprises a main pier permanent support cushion stone and a main pier permanent support arranged on the main pier permanent support cushion stone; when the swivel spherical hinge assembly and the main pier support assembly are constructed, the height of the spherical hinge base is adjusted so that the top surface height of the support type swivel spherical hinge is higher than the top surface height of the main pier permanent support, and the height difference between the top surface of the support type swivel spherical hinge and the top surface of the main pier permanent support is greater than 10-20 cm of the deflection value of the end of the swivel beam; 2) constructing a dynamic balance system of the swivel at the top of the main pier, or arranging an auxiliary support below the swivel beam at the middle position of the side span; 3) manufacturing the swivel beam at the prefabrication position before the swivel, the length of the swivel beam being equal to the length of the completed bridge, and the side span cover beam is constructed at the same time; 4) After the completion of the manufacture of the rotating beam, before the rotation, set the jack at the bridge support position at the end of the rotating beam, jack up the beam body, the jacking force is the support reaction force design value F at the side pier when the bridge is completed, and the upward deflection value of the end of the rotating beam is measured ; then remove the jack, measure the beam bottom elevation data H at the side pier support position and the main pier permanent support position of the rotating beam 边 and H 中 ; 5) According to the measured deflection value of the swivel beam end and the beam bottom elevation data, and combined with the design elevation T of the top of the main pier permanent support cushion stone at the main pier position 中 , the actual elevation of the top of the side pier support cushion stone at the side pier is calculated as T 边 = H 边 - d h - t 边 + , wherein d h is the swivel beam drop height value, d h = H 中 - T 中 - t 中 , t 边 and t 中 are the side pier support and main pier permanent support heights, respectively; 6) According to the calculated T 边 The value, the abutment cushion stone of the abutment is poured and constructed at the abutment top position to the actual elevation, and the abutment support is installed. 7) performing swivel construction of the swivel beam; 8) after the swivel is completed, the dynamic balance system or the auxiliary support of the swivel is removed, a jack is arranged at the top of the main pier to support the beam body, the swivel spherical hinge assembly is removed, and the swivel beam is lowered onto the main pier and the side pier permanent support to complete the system conversion.

2. The method according to claim 1, wherein the method is characterized by: The dynamic balance system comprises a rotating table, a support leg, a slide, a counterforce base and a traction cable, the rotating table is fixed to the bottom of the swivel beam and supported on the top of the main pier through the support leg, the bottom of the support leg is slidingly connected to the slide, the counterforce base is arranged on the top of the main pier, and the counterforce base drives the rotating table to rotate through the traction cable.

3. The method according to claim 1, wherein the method is characterized by: The auxiliary support comprises an auxiliary support leg, an arc-shaped track and a driving mechanism, the arc-shaped track extends from the prefabrication position before the swivel to the completed bridge position in the swivel direction of the swivel beam, the top of the auxiliary support leg supports the swivel beam, and the auxiliary support leg is driven to move along the arc-shaped track through the driving mechanism.

4. The method according to claim 1, wherein the method is characterized by: The manufacturing of the swivel beam in step 3) is performed by erecting a support to cast in situ or by using a hanging basket to suspend and cast.

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