DE202021103010U1 - Support structure for the installation of joinable cover beams of a prefabricated bridge - Google Patents

Abstract

Support structure for installation of joinable cover beams of a prefabricated bridge, comprising a connection seat firmly connected to a storage platform (2), the upper end of which is firmly connected to support rods, a reaction force frame (8) being firmly connected to the head ends of the support rods, with a first jack (7) is firmly attached to the bottom of the reaction force frame (8), with a fastening nut in each case in threaded connection with the upper parts of the support rods and the fastening nuts are located below the reaction force frame (8).

Description

Technical area

The invention relates to the technical field of the installation of joinable cover beams of a prefabricated bridge, in particular to a support structure for the installation of joinable cover beams of a prefabricated bridge.

State of the art

The cover beams used in urban viaducts with six or more bi-directional lanes are generally more than 27 meters long and most of them are designed as a long cantilever structure. In order to meet the requirement that the length of the road transport components is less than 13 m, this type of cover beam is usually made up of two parts. That means, after the pillars have been craned in place, the middle is connected to a whole by pouring the wet joint. Due to the overlong cantilever arm of the individual cover beam, the individual cover beam cannot keep its equilibrium after they have been craneed one after the other at the installation site. It is therefore necessary to place temporary supports above the center of gravity to ensure the stability of the individual cover beam.

The method for linear control of joinable cover beams usually consists of: The cover beam is raised by the transport vehicle to the upper end of the vertical column and slowly lowered towards the pre-buried steel bars at the upper end of the vertical column. The position of the cover beam plane is adjusted by the middle ink line, and with the help of a total station the included angle between the outer ink line of the cover beam and the center line of the stand column is observed and verticalized by adjusting the base plate. The temporary supports can only be removed when the wet joint has been bound by the steel rods, the concrete has been poured, the prestressing has been tensioned and the pipe filling has been completed until the two cover beams are integrated and anchored to the column.

However, the temporary supports take up the pavement space, and the passage of vehicle traffic can therefore not be guaranteed in narrow sections of the road. In the case of special pillars, such as underwater piers, to which no temporary supports can be attached on either side, the installation of joinable cover beams of the prefabricated bridge cannot be carried out. In the case of high pillars, measures that require a corresponding increase in support are also time-consuming. The time from binding the steel rods to reaching the infill strength of the wet joint required to detach the supports takes 17 days. Therefore, in terms of the number of supports and the occupancy of the floor space, the assembled bridge is almost the same as the cover beam cast on site at the construction site and does not show any superiority.

Disclosure of the invention

The object of the invention is to provide a support structure for the installation of joinable cover beams of a prefabricated bridge in order to solve the problems mentioned above in the prior art.

• Stützstruktur für Installation von zusammenfügbaren Abdeckbalken einer vorgefertigten Brücke, umfassend einen fest mit einer Lagerplattform verbundenen Verbindungssitz, dessen obere Ende fest mit Stützstangen verbunden ist, wobei ein Rückwirkungskraftrahmen fest mit den Kopfenden der Stützstangen verbunden ist, wobei ein erster Heber fest unten an dem Rückwirkungskraftrahmen angeschlossen ist, wobei je eine Befestigungsmutter in Gewindeverbindung mit den oberen Teilen der Stützstangen steht und die Befestigungsmütter sich unterhalb des Rückwirkungskraftrahmens befinden.

In order to achieve the above object, the invention offers the following technical solutions:

• Support structure for installation of joinable cover beams of a prefabricated bridge, comprising a connection seat firmly connected to a storage platform, the upper end of which is firmly connected to support rods, a reaction force frame being firmly connected to the head ends of the support rods, with a first lifter firmly connected to the bottom of the reaction force frame is, with each one fastening nut is in threaded connection with the upper parts of the support rods and the fastening nuts are located below the reaction force frame.

As a further solution of the invention, it is provided that the connection seat is designed as pre-buried steel rods which are pre-buried in the storage platform, a connecting sleeve being arranged at the upper ends of the pre-buried steel rods, and the support rods being designed as supporting steel rods which are each firmly connected to the pre-buried steel rods via a connecting sleeve.

As a further solution of the invention it is provided that the pre-buried depth of the pre-buried steel rods is at least 2 m, and the length of the sections of the pre-buried steel rods exposed above the storage platform is at least 1 m.

As a further solution of the invention, it is provided that the support structure further comprises a Bailey frame firmly connected to a bridge stand column, a distribution bar being arranged on the outside of the Bailey frame, with a second lifter firmly connected to the top of the distribution bar, and the second jack is below the cover beam.

As a further solution of the invention, it is provided that the Bailey frame is firmly connected to the bridge pillar via a support seat provided on the bridge pillar, and the support seat comprises steel rods firmly connected to the bridge pillar.

As a further solution of the invention it is provided that the Bailey frame is a two-part Bailey frame.

1. 1. Diese Anmeldung verwendet das Nachverankerungsinsallationsverfahren. Bei der Nachverankerungsinsallationstechnologie handelt es sich darum, dass am Heckteil des Abdeckbalkens Reservelöcher reserviert sind, und feinwalzende Gewindestahlstangen an der entsprechenden Position der Lagerplattform vorvergraben sind, und das Prinzip des Gegendrucks des Hebers eingesetzt wird, so dass bei dem Einzelnen Abdeckbalken die Standsäule als Stützpunkt dient, um ein balanciertes Befestigungssystem zu bilden. Nachdem der Aufbau der Nassfuge abgeschlossen ist, und das Spannen und Verfüllen des Abdeckbalkens abgeschlossen ist, wird das Verankerungssystem der feinwalzenden Gewindestahlstangen entfernt, wodurch die bodenfreie Installation der zusammenfügbaren Abdeckbalken realisiert wird. Insbesondere werden die feinwalzenden Gewindestahlstangen durch die Lagerplattform verankert. Das Verankerungssystem ist zwischen den Standsäulen befindlich, nimmt nicht den Bodenraum auf beiden Seiten ein und eignet sich für die Vielseitigkeit der Installation in verschiedenen Umgebungen wie Unterwasserpfeilern oder Hochpfeilern. Hierbei sind keine Unterstützungen erforderlich, und die feinwalzenden Gewindestahlstangen können ebenfalls wiederverwendet werden, wodurch die Anschaffungskosten für temporäre Bauausrüstungen erheblich gesenkt werden.
2. 2. Diese Anmeldung fügt einen vorderen Stützpunkt auf der Basis der Nachverankerung des Abdeckbalkens hinzu, was die lineare Einstellung des Abdeckbalkens unterstützt. Diese Installationstechnologie besteht darin, Stahlstäbe auf der Seitenfläche der Standsäule vorzuvergraben und die auf beiden Seiten freitragenden zweiteiligen Bailey-Rahmen zu verwenden, um das halbe Gewicht des Abdeckbalkens zu tragen. Am Heckteil des Abdeckbalkens sind Reservelöcher vorgesehen, und feinwalzende Gewindestahlstangen sind an der entsprechenden Position der Lagerplattform vorvergraben. Das Prinzip des Gegendrucks des Hebers wird eingesetzt. Das halbe Gewicht des Abdeckbalkens wird getragen und schließlich wird die Balance und Fixierung des Abdeckbalkens erreicht;
3. 3. Bei dieser Anmeldung werden zwei Installationstechnologien für Installation von zusammenfügbaren Abdeckbalken einer vorgefertigten Brücke, also die Nachverankerung und die Vorderstützung und Nachverankerung, gewählt, wodurch der Bauraum vor Ort verringert und eine normale Verkehrsfahrt gewährleistet wird. Nach der Verwendung der Installationstechnologien der Nachverankerung und der Vorderstützung und Nachverankerung werden das Baupersonal und die Baumaschinen reduziert, und das Sicherheitsrisiko bei der Konstruktion wird ebenfalls verringert.

Compared to the prior art, the advantageous effects of the invention are:

1. 1. This application uses the post anchor installation method. In the case of the post-anchoring installation technology, reserve holes are reserved on the rear part of the cover beam, and fine-rolled threaded steel rods are buried in advance at the corresponding position on the storage platform, and the principle of counterpressure of the jack is used, so that the stand column serves as a support point for the individual cover beam to form a balanced fastening system. After the construction of the wet joint has been completed and the tensioning and filling of the cover beam has been completed, the anchoring system of the fine-rolling threaded steel rods is removed, whereby the floor-free installation of the joinable cover beams is realized. In particular, the fine-rolling threaded steel bars are anchored by the storage platform. The anchoring system is located between the standing columns, does not take up the floor space on either side and lends itself to the versatility of installation in different environments such as underwater pillars or high pillars. No support is required here, and the fine-rolled threaded steel bars can also be reused, which significantly reduces the acquisition costs for temporary construction equipment.
2. 2. This application adds a front support point based on the post anchoring of the cover beam, which aids in the linear adjustment of the cover beam. This installation technology consists of pre-burying steel bars on the side face of the stand column and using the two-piece Bailey frames cantilevered on either side to support half the weight of the cover beam. Reserve holes are provided at the rear of the cover beam, and fine-rolling threaded steel bars are pre-buried in the corresponding position on the storage platform. The principle of the counter pressure of the lifter is used. Half the weight of the cover beam is borne and finally the balance and fixation of the cover beam is achieved;
3. 3. In this application, two installation technologies for the installation of joinable cover beams of a prefabricated bridge, ie the post-anchoring and the front support and post-anchoring, are selected, which reduces the installation space on site and ensures normal traffic. After using the post anchoring and front support and post anchoring installation technologies, the construction personnel and construction machinery are reduced, and the safety risk in the construction is also reduced.

Figure list

• 1 Fig. 3 is a front view of Embodiment 1 of the present invention;
• 2 Fig. 3 is a side view of embodiment 1 of the present invention;
• 3 Fig. 3 is a front view of Embodiment 2 of the present invention;
• 4th Fig. 3 is a side view of embodiment 2 of the present invention.

Embodiments of the invention

The technical solutions in the exemplary embodiments of the invention are described more clearly and completely in connection with the drawings in the exemplary embodiments. Obviously, the exemplary embodiments described are only a part of the exemplary embodiments of the invention, but not all exemplary embodiments. On the basis of these exemplary embodiments, the person skilled in the art can also obtain all other exemplary embodiments, all of which fall within the scope of protection of the invention.

Embodiment 1

With reference to 1 until 2 In the exemplary embodiment of the invention, a support structure for the installation of joinable cover beams of a prefabricated bridge is provided, comprising one fixed to a storage platform 2 connected connecting seat, the connecting seat as pre-buried steel bars 4th is formed in the storage platform 2 are pre-buried. At the top of the pre-buried steel bars 4th each is a connecting sleeve 5 arranged. The support rods are designed as supporting steel rods 6th formed, each via a connecting sleeve 5 firmly to the pre-buried steel bars 4th are connected. The top of the link seat is firmly connected with support rods. A reaction force framework 8th is firmly connected to the head ends of the support rods. A first lifter 7th is firmly at the bottom of the reaction force frame 8th connected. A fastening nut is threadedly connected to the top of the support rod. The fastening nut is located below the reaction force frame 8th .

When using the invention, the rear part of the cover beam, depending on the model, uses four or three fine-rolling threaded steel bars of the type 830 with a diameter of 40 mm according to the safety factor of 1.3 and a yield point in order to provide the equilibrium system with a tensile force of 2214 kN. Fine-rolled threaded steel bars must be pre-buried 2 m deep in the storage platform in order to meet the tensile strength requirement. The pre-buried fine-rolling threaded steel rods are 1 m long exposed over the storage platform, and are connected to an upper reusable fine-rolling threaded steel rod via the connecting sleeves. Above, a Type 40 double I steel beam is used as the reaction force frame. Two 200 tonne jacks are used for lifting. After reaching the intended lifting force, the anchoring is carried out by tightening the fastening nut. The length of the hanger on the 350-ton crawler crane is adjustable and is useful for adjusting the position of the cover beam during the lifting process.

During the construction process, the following steps are included:

Step 1: Four fine-rolling threaded steel bars of type 830 with a diameter of 50 mm are prepared at the position of the fine-rolling threaded steel bars on the rear part of the corresponding cover beam. Four 8 cm round holes are reserved in the corresponding positions of the cover beam for the subsequent penetration of fine-rolling threaded steel rods of 40 mm.

Step 2: A height-adjustable base plate and a mortar cover are attached according to the height of the cover of the column. The single cover beam is lifted by the 350-tonne crawler crane. A length-adjustable hanger adjusts the position of the cover beam so that it is horizontally aligned and ready for installation. An M60 special mortar bedding is applied to the top of the bridge stand column, and the cover beam is craned in place and the lifting force is kept unchanged.

Step 3: The 20-ton crane lifts the fine-rolling threaded steel bars one after the other through the reserve holes on the rear section of the cover beam with manual assistance. The lower part is in connection with the sleeves of the pre-buried fine-rolling threaded steel bars in the storage platform. The steel washer, fastening nut, reaction force frame and jack are attached to the upper part. The two jacks start to load according to the preset reaction force, while the lifting force of the crawler crane is relieved synchronously. After reaching the preset reaction force value, the crawler crane maintains a lifting force of 20 tons to avoid accidents. The fastening nut on the ceiling part of the cover beam is immediately tightened for anchoring. The crane is unloaded to 0 and the tensioned jacks are unloaded to 0. This completes the anchoring.

Step 4: Step 3 is repeated. Another cover beam is crane-lifted and the two cover beams are joined together by wet casting to complete the installation of the joinable cover beams.

Embodiment 2

With reference to 3 until 4th In the exemplary embodiment of the invention, a support structure for the installation of joinable cover beams of a prefabricated bridge is provided, comprising one fixed to a storage platform 2 connected connecting seat, the connecting seat as pre-buried steel bars 4th is formed in the storage platform 2 are pre-buried. At the top of the pre-buried steel bars 4th a connecting sleeve is arranged in each case. The support rods are designed as supporting steel rods 6th formed, each via a connecting sleeve 5 firmly to the pre-buried steel bars 4th are connected. The upper end of the connecting seat is firmly connected to support rods. A reaction force framework 8th is firmly connected to the head ends of the support rods. A first lifter 7th is firmly at the bottom of the reaction force frame 8th connected. A fastening nut is threadedly connected to the top of the support rod. The fastening nut is located below the reaction force frame 8th .

Furthermore, the support structure includes a fixed pillar with a bridge stand 1 connected Bailey frame 10 . A distribution bar 11 is on the outside of the Bailey frame 10 arranged. Another jack 12th is firmly connected to the top of the distribution beam 11, and the second lifter 12th is located below the cover beam 3 , being the Bailey frame 10 via one on the bridge stand pillar 1 provided support seat 9 firmly to the bridge stand pillar 1 is connected, and the support seat 9 firmly with the Bridge stand pillar 1 includes connected steel rods.

When using the invention, the rear part of the cover beam uses two fine rolling thread steel bars of the type 830 with 32 mm diameter according to the safety factor of 1.3 and a yield point in order to provide the equilibrium system with a tensile force of 1060 kN. The total force of the cantilever support of the Bailey frame is kept at 1015 kN, and the supporting force at the one-sided cantilever position of the Bailey frame is 507.5 kN. The reinforced single-ply double-row Bailey frame is selected. The Bailey frame protrudes 4.25 m from the steel bars as a support point to the outside. This support point is 0.96 m above the theoretical center of gravity of the component, 6.5 m from the end of the wet joint, and the post-change point is 6.6 m away from the steel bars. In order to prevent the Bailey frame from tipping over when the single cover beam is attached to the side where the crane will be performed first, it is necessary to fit two fine-rolling thread steel bars of the type 830 32mm in diameter to the Bailey frame on the side where the crane will be performed later, to anchor them to the storage platform for temporary balance.

During the construction process, the following steps are included:

Step 1: Four fine-rolling threaded steel rods of type 830 with a diameter of 32 mm are prepared at the position of the fine-rolling threaded steel rods on the rear part of the corresponding cover beam. Two 8 cm round holes are reserved in the corresponding positions of the cover beam for the subsequent penetration of fine-rolling threaded steel rods of 32 mm. High-strength steel rods are placed in the reserve holes on the side of the stand column and the two-piece Bailey frame is canted in place. The preset number of heights at the support point of the Bailey frame should be calculated based on the deformation of the Bailey frame and the elongation of the fine-rolling threaded steel bars. On the side where the crane will later be carried out, two fine-rolling thread steel bars of the type 830 with a diameter of 32 mm are set up to anchor them to the storage platform for a temporary balance.

Step 2: A height adjustable base plate and mortar screen are attached according to the height number of the cover of the column, and the single cover beam is lifted by a 350 ton crawler crane in preparation for joining. An M60 special mortar bedding is applied to the top of the bridge stand column, and the cover beam is craned in place. The vertical lifting force of the two lifting points on the cover beam is kept at 950 kN to ensure that the end of the pillar is loaded first, and thus to prevent the entire force from being applied to the support point and overloading the support point.

Step 3: The height and inclination of the cover beam are set using the support points on the Bailey frame. The 20-ton crane lifts the fine-rolling threaded steel bars one after the other through the reserve holes on the rear section of the cover beam with manual assistance. The lower part is in connection with the sleeves of the pre-buried fine-rolling threaded steel bars in the storage platform. The steel washer, fastening nut, reaction force frame and jack are attached to the upper part. The force at the lifting point is relieved to 310 kN. At this point in time, the support point is applied with a force of 1015 kN. The fine-rolling threaded steel bars are clamped to 1060 kN. At this point in time the crane holds the force 310 kN. The fastening nut on the ceiling part of the cover beam is immediately tightened for anchoring. The crane is relieved to 0.

Step 4: Step 3 is repeated. Another cover beam is crane-lifted and the two cover beams are joined together by wet casting to complete the installation of the joinable cover beams.

It is obvious to a person skilled in the art that the invention is not limited to the details of the above exemplary embodiments. Moreover, the invention can be implemented in other specific forms without departing from the spirit or basic features of the invention. Regardless of the standpoint, therefore, the embodiments should be viewed as exemplary and not restrictive. The scope of the invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes coming within the meaning and scope of equivalent elements of the claims be included in the invention. Reference signs in the claims should not be construed as limiting the claims concerned.

Furthermore, it should be understood that, although this description is described according to the embodiments, not every embodiment contains only an independent technical solution. This narrative style of description is for illustrative purposes only. Those skilled in the art should consider the description as a whole. The technical solutions in the embodiments can also be combined in a suitable manner in order to form other embodiments that can be understood by those skilled in the art.

List of reference symbols

1

Bridge stand pillar

2

Storage platform

3

Cover beam

4th

pre-buried steel bars

5

Connecting sleeve

6th

Supporting steel bars

7th

first lifter

8th

Reaction force framework

9

Support seat

10

Bayley frame

11

Distribution bars

12th

second lifter

Claims (6)

Support structure for installation of joinable cover beams of a prefabricated bridge, comprising a connection seat firmly connected to a storage platform (2), the upper end of which is firmly connected to support rods, a reaction force frame (8) being firmly connected to the head ends of the support rods, with a first jack (7) is firmly connected at the bottom of the reaction force frame (8), with a fastening nut each threadedly connected to the upper parts of the support rods and the fastening nuts being located below the reaction force frame (8). Support structure for the installation of joinable cover beams according to a prefabricated bridge Claim 1 , characterized in that the connection seat is designed as pre-buried steel rods (4) which are pre-buried in the storage platform (2), with a connecting sleeve (5) being arranged at each of the upper ends of the pre-buried steel rods (4), and with the support rods are designed as supporting steel rods (6) which are each firmly connected to the pre-buried steel rods (4) via a connecting sleeve (5). Support structure for the installation of joinable cover beams according to a prefabricated bridge Claim 1 , characterized in that the pre-buried depth of the pre-buried steel rods (4) is at least 2 m, and the length of the sections of the pre-buried steel rods (4) exposed over the storage platform (2) is at least 1 m. Support structure for the installation of joinable cover beams according to a prefabricated bridge Claim 1 , characterized , further comprising a Bailey frame (10) fixedly connected to a bridge stand pillar (1), a distribution beam (11) being arranged on the outside of the Bailey frame (10), with a second lifter (12) on top of the Distribution bar is firmly connected (11), and the second lifter (12) is located below the cover bar (3). Support structure for the installation of joinable cover beams according to a prefabricated bridge Claim 4 , characterized in that the Bailey frame (10) is firmly connected to the bridge pillar (1) via a support seat (9) provided on the bridge pillar (1), and the support seat (9) is firmly connected to the bridge pillar (1) with steel rods includes. Support structure for the installation of joinable cover beams according to a prefabricated bridge Claim 1 , characterized in that the Bailey frame (10) is a two-part Bailey frame.

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