A method for constructing a T-shaped bridge with no span cast-in-situ combined dragon section

Abstract

The application provides a method for constructing a T-shaped bridge with no side span cast-in-situ combined closure segment and a swivel, which comprises the following steps: before swiveling, a swivel beam with the same length as the bridge is manufactured, and according to the deflection value on the beam end of the side pier support jacking and the beam bottom elevation data, the actual elevation of the side pier support cushion top is calculated in combination with the design elevation of the swivel beam bottom at the main pier position, and the side pier support cushion is casted; then the swivel beam swiveling construction is carried out, after the swiveling is completed, the swivel beam is dropped to the side pier support and the main pier system conversion temporary cushion, and then the pier beam is sealed. The application can realize one-time swiveling and beam dropping to form a bridge, can solve the problems of the influence of the cast-in-situ combined closure segment construction on the operation and safety of the bridge structures, can solve many problems of the post-cast side span support cushion or bent cap, and can be applied to the swivel design and construction of most T-shaped bridges under general conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge construction, and particularly relates to a T-shaped 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 interchanges appear. In order to reduce the influence of construction on the operation and safety of the existing traffic under the interchanges, for the bridge crossing the busy traffic routes, the swivel construction method has been widely applied. In the overline interchanges, the T-shaped bridge is widely applied due to its clear structure stress and simple construction process, and can adapt to most overline sites.

[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 T-shaped 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 cast-in-situ closure segment. At present, this method is the most commonly used scheme. The advantages of this method 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. The disadvantage of this method is that the cast-in-situ closure segment construction needs to set up cast-in-situ support, and the cast-in-situ support near the bridge understructure will have a great influence on the operation and safety of the bridge understructure during the construction.

[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 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 method can realize the cast-in-situ closure segment construction, and can also make the side pier support have a certain counterforce reserve. However, this method needs to pour the side span support cushion stone or cap beam under the swiveled beam body and install the support, and the construction space is limited, the operation is difficult, the construction quality is difficult to guarantee, and the support counterforce error is large. SUMMARY

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

[0007] To achieve the above purpose, the application adopts the following technical scheme.

[0008] A method for rotating a T-shaped bridge with a cast-in-place closure segment without a side span includes the following steps:

[0009] 1) Reserve a joint for the anchoring steel bars for the later pier beam consolidation at the top of the main pier, and at the same time construct the rotating ball hinge assembly and the temporary pad stone for the main pier system conversion 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. The length of the rotating beam is equal to the length of the completed bridge. The joint of the anchoring steel bars for later pier and beam consolidation is reserved at the bottom of the rotating beam. The side span cap beam is 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 pier 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 main pier ball hinge positions 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 bottom of the rotating beam 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 边 The height of the side pier support;

[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, remove the dynamic balance system or auxiliary support of the rotation, and at the same time set up jacks on the top of the main pier to support the beam. Remove the rotating ball hinge assembly so that the rotating beam can be lowered onto the side pier support and the temporary pad stone for the main pier system conversion.

[0017] 9) Connect the main pier and the rotating beam to the pier-beam consolidation anchorage steel bar joint, pour concrete to consolidate the pier and beam, and complete the system conversion.

[0018] Further, the swivel spherical hinge assembly comprises a spherical hinge base and a support swivel spherical hinge arranged on the spherical hinge base, and the main pier system conversion temporary cushion stones are symmetrically arranged on both sides of the spherical hinge base.

[0019] Further, in the step 1), when the swivel spherical hinge assembly and the main pier system conversion temporary cushion stones are constructed, the height of the spherical hinge base is adjusted, so that the top elevation of the support swivel spherical hinge is higher than the top elevation of the main pier system conversion temporary cushion stones, and the height difference between the top of the support swivel spherical hinge and the top of the main pier system conversion temporary cushion stones is greater than the deflection value of the swivel beam end.

[0020] Further, the height difference between the top of the support swivel spherical hinge and the top of the main pier system conversion temporary cushion stones is 10-20 cm greater than the deflection value of the swivel beam end.

[0021] Further, the power balance system comprises a rotating platform, a support leg, a slide, a counterforce base and a traction cable, the rotating platform is fixed on the beam bottom of the swivel beam and supported on the top of the main pier by 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 platform to rotate through the traction cable.

[0022] Further, the auxiliary support comprises an auxiliary support leg, an arc-shaped track and a driving mechanism, the arc-shaped track extends from the prefabricated position before the swivel to the bridge completion 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 by the driving mechanism.

[0023] Further, in the step 3), the swivel beam is manufactured by erecting a support to cast in situ or by using a hanging basket to suspend and cast.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] (1) The T-structure bridge swivel construction method without side span cast-in-situ closure segment provided by the present application can make the swivel beam without cast-in-situ closure segment, and the bridge is completed after the swivel beam falls, which avoids 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, reduces the construction process of the bridge after the swivel, and shortens the construction period.

[0026] (2) Compared with the cast-in-situ closure segment construction method without cast-in-situ closure segment of the post-cast support cushion stone, the side pier top permanent support and the support cushion stone can be constructed before the swivel according to the T-structure bridge swivel construction method without side span cast-in-situ closure segment provided by the present application, and the bridge is directly completed after the swivel, which avoids the construction of the support cushion stone after the swivel, and solves the problems of difficult operation, difficult guarantee of construction quality and large error between the support counterforce and the design value.

[0027] (3) The T-shaped bridge turn-to-construct method can accurately control the counterforce value at the support of the two side piers after the T-shaped bridge system is converted, thereby ensuring the safety of the structure after the T-shaped bridge system is converted.

[0028] The application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a turn-to-construct plane diagram of the main pier of the turn-to-construct beam in the application;

[0030] Figure 2 is a turn-to-construct plane diagram of the auxiliary support arranged in the side span in the application;

[0031] Figure 3 is a diagram of the turn-to-construct beam manufacturing and the turn-to-construct beam end jacking before the turn-to-construct in the application;

[0032] Figure 4 is a turn-to-construct posture diagram of the turn-to-construct beam with the dynamic balance system arranged at the top of the main pier in the application;

[0033] Figure 5 is a turn-to-construct posture diagram of the turn-to-construct beam with the auxiliary support arranged in the side span in the application;

[0034] Figure 6 is a diagram of the turn-to-construct beam falling after the turn-to-construct in the application;

[0035] Figure 7 is a diagram of the main pier top sealing after the turn-to-construct in the application;

[0036] Figure 8 is a turn-to-construct cross section diagram of the turn-to-construct beam with the dynamic balance system arranged at the top of the main pier in the application;

[0037] Figure 9 is a plane arrangement diagram of the dynamic balance system at the top of the main pier in the application;

[0038] Figure 10 is a turn-to-construct cross section diagram of the turn-to-construct beam with the auxiliary support arranged in the side span in the application;

[0039] Figure 11 is a main pier cross section diagram after the dynamic balance system is removed after the turn-to-construct;

[0040] Figure 12 is a main pier cross section diagram after the turn-to-construct ball hinge assembly is removed after the turn-to-construct;

[0041] Figure 13 is a main pier cross section diagram of the turn-to-construct beam falling back after the turn-to-construct;

[0042] Figure 14 is a main pier cross section diagram after the turn-to-construct becomes a bridge.

[0043] Explanation of reference signs: 1, main pier; 2, swivel beam; 3, side pier; 4, arc-shaped track; 5, auxiliary support leg; 6, jack; 7, spherical hinge base; 8, swivel spherical hinge; 9, side pier support; 10, pier top sealing layer; 11, swivel table; 12, counterforce base; 13, main pier system conversion temporary cushion stone; 14, support foot; 15, slide; 16, traction cable. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0045] 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 shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying 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.

[0046] 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, it can also be detachable connection, it can also be in contact connection or integral connection; for those skilled 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 "multiple" is two or more.

[0047] The embodiment provides a no-side-span cast-in-place splicing segment T-shaped bridge swivel construction method, and specifically comprises the following steps:

[0048] (1) first, design and construct the lower foundation and the pier according to the conventional bridge, and reserve the post-pier beam consolidation anchoring steel joint at the top of the main pier, and the construction process is the prior art, and the specific operation is not repeated here; then, the swivel spherical hinge assembly and the main pier system conversion temporary cushion stone 13 are constructed at the position of the top of the main pier.

[0049] Wherein, the swivel ball hinge assembly includes a ball hinge base 7 and a support swivel ball hinge 8 arranged on the ball hinge base 7, and the main pier system conversion temporary cushion stones 13 are symmetrically arranged on both sides of the ball hinge base 7. When the swivel ball hinge assembly and the main pier system conversion temporary cushion stones 13 are constructed, the height of the support swivel ball hinge 8 top surface (i.e. the bottom surface height of the swivel beam) is higher than the top surface height of the main pier system conversion temporary cushion stones 13 by adjusting the height of the ball hinge base 7, and the height difference between the top surface of the support swivel ball hinge 8 and the top surface of the main pier system conversion temporary cushion stones 13 is greater than the swivel beam end deflection value and has an appropriate allowance (generally 10cm-20cm), which ensures that the beam bottom surface height of the swivel beam 2 under the cantilever state is higher than the top surface height of the pre-set side pier support 9, and the swivel is not blocked, and 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.

[0050] (2) The dynamic balance system for the swivel of the main pier 1 top is constructed, which provides power for the subsequent swivel of the swivel beam. Specifically, as shown in Figure 1 、 Figure 4 、 Figure 7 and Figure 8 , the dynamic balance system includes a turntable 11 arranged on the main pier top, a support leg 14, a slide 15, a counterforce seat 12 and a traction cable 16, the turntable 11 is supported on the main pier 1 top through the support leg 14, the bottom of the support leg 14 is slidingly connected to the slide 15, the counterforce seat 12 is arranged on the main pier 1 top, and the counterforce seat 12 drives the turntable 11 to rotate through the traction cable 16, thereby providing power for the swivel of the swivel beam 2, and the support leg 14 and the slide 15 can effectively avoid the overturning danger of the swivel structure during the swivel process.

[0051] Another embodiment can also not set the dynamic balance system on the main pier 1 top, but set an auxiliary support under the swivel beam 2 at a suitable position in the side span; specifically, as shown in Figure 2 、 Figure 5 and Figure 9 , the auxiliary support includes an auxiliary support leg 5, an arc-shaped track 4 and a driving mechanism, the arc-shaped track 4 extends in the swivel direction of the swivel beam 1 from the prefabrication position before the swivel to the bridge completion position, the auxiliary support leg 5 supports the swivel beam 2 at the top and drives it to move along the arc-shaped track 4 through the driving mechanism, thereby providing power for the swivel of the swivel beam 2.

[0052] (3) The swivel beam 2 is manufactured by cast-in-situ through erection of support or by hanging basket suspension casting at the prefabrication position before the swivel, the length of the swivel beam 2 is equal to the bridge completion length, and there is no cast-in-situ closure segment length, and the anchoring steel joint of the pier-beam consolidation in the later stage is reserved at the bottom of the swivel beam 2, and the side span bent cap is constructed at the same time.

[0053] (4) After the completion of the construction of the rotating beam 2, the jacks 6 are arranged at the end of the rotating beam 2 before the rotation, and the beam body is lifted, as shown in Figure 3 , the lifting force is designed as the support reaction force design value F of the side pier 3 when the bridge is completed, and the upward deflection value Δ of the end of the rotating beam 2 is measured; then the jacks 6 are removed, and the elevation data H 边 and H of the beam bottom at the side pier support 9 position and the main pier spherical hinge position of the rotating beam 2 are measured.

[0054] (5) According to the measured upward deflection value of the end of the rotating beam 2 and the elevation data of the beam bottom, and in combination with the design elevation T 中 of the beam bottom at the position of the main pier 1, the actual elevation T 边 of the top of the side pier support cushion stone at the side pier 3 is calculated as T 边 = H h -d 边 -t h + Δ, wherein d h is the falling height value of the rotating beam, d 中 = H 中 -T 边 , and t 边 is the height of the side pier support.

[0055] (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.

[0056] (7) The support or the hanging basket for manufacturing the rotating beam 2 is removed, and the rotating beam 2 is rotated by using the dynamic balance system or the auxiliary support.

[0057] (8) After the rotation is completed, as shown in Figure 6 , Figure 10 , Figure 11 , Figure 12 and Figure 13 , the dynamic balance system or the auxiliary support for the rotation is removed, the jacks 6 are 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, and the rotating beam 2 is lowered to the side pier support and the temporary cushion stone 13 of the main pier system conversion.

[0058] (9) The pier beam consolidation anchoring steel bars between the main pier 1 and the rotating beam 2 are connected, the concrete is poured for the pier beam consolidation, the pier top sealing layer 10 is formed, the system conversion is completed, the bridge surface auxiliary facilities are constructed, and the completed bridge state is formed.

[0059] The method can make the rotating beam not have a cast-in-situ joint segment, and the bridge is formed after the rotating beam falls, thereby avoiding the influence of the cast-in-situ joint segment construction on the operation and safety of the existing railway, highway and other structures under the bridge, reducing the construction process of the bridge after the rotating beam falls, and shortening the construction period; compared with the cast-in-situ joint segment construction method of the post-cast bearing pad stone, the construction of the permanent bearing and the bearing pad stone on the side pier top can be completed before the rotating, and the bridge is directly formed after the rotating beam falls, thereby avoiding the construction of the bearing pad stone after the rotating, and problems such as difficult operation, difficult guarantee of construction quality, and large error between the bearing reaction and the design value.

[0060] 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 T-shaped bridge with a cast-in-situ spliced segmental turnabout, characterized in that, The method comprises the following steps: 1) reserving the post-stage pier beam consolidation anchoring steel joint at the top of the main pier, and constructing the swivel spherical hinge assembly and the main pier system conversion temporary cushion 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 system conversion temporary cushion is symmetrically arranged on both sides of the spherical hinge base; when the swivel spherical hinge assembly and the main pier system conversion temporary cushion 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 system conversion temporary cushion, and the height difference between the top surface of the support type swivel spherical hinge and the top surface of the main pier system conversion temporary cushion is greater than 10-20 cm of the end deflection value of the swivel beam; 2) constructing the dynamic balance system of the swivel at the top of the main pier, or arranging the 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, and the length of the swivel beam is equal to the length of the completed bridge, and the post-stage pier beam consolidation anchoring steel joint is reserved at the bottom of the swivel beam, and the side span cover beam is constructed at the same time; 4) After the completion of the manufacture of the swivel beam, before the swivel, set the jack at the bridge support position at the end of the swivel 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 swivel beam is measured ; then remove the jack, measure the beam bottom elevation data H at the side pier support position and the main pier spherical hinge position of the swivel beam 边 and H 中 ; 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 bottom of the rotating beam 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 + , where d h d represents the drop height of the rotating beam. h =H 中 -T 中 , t 边 The height of the side pier support; 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 the swivel construction of the swivel beam; 8) after the swivel is completed, the dynamic balance system of the swivel or the auxiliary support 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 to the side pier support and the main pier system conversion temporary cushion; 9) connecting the pier beam consolidation anchoring steel joint between the main pier and the swivel beam, pouring the concrete to consolidate the pier beam, and completing 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 at 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: In the step 3), the swivel beam is manufactured by erecting a support for cast-in-place or by using a hanging basket for suspended pouring.

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