JPS6041165B2 - Equipment for cantilevering bridge structures made of reinforced concrete or prestressed concrete into sections. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bridge structure made of reinforced concrete or prestressed concrete having a roadway plate provided on the upper part and extending laterally, and having a closed box-shaped cross section. A device for erection, provided on the underside of the superstructure, extending beyond the superstructure in already completed sections, supporting the formwork for the superstructure, and supporting the interconnected longitudinal girders and the structures to be erected. Along the rails that are stationary on the girder at the bottom of the blank erection section and are placed by means of running devices along both external sides of the longitudinal girder and fixed to the superstructure of the already completed section. It relates to a device that is supported so that it can be moved.

It is described as a so-called overhang construction work vehicle for constructing bridge structures by cantilever overhang erection for each section, and is supported on the already completed part of the bridge structure, and is used to construct bridge structures from this bridge part forward. The equipment supporting the formwork for constructing the overhang and the next concreting on the working scaffold placed on the underside of the bridge superstructure in this overhang is known. There is.

A projecting construction vehicle of this type is particularly suitable for the construction of T-shaped cantilevers which can extend from the piers on each side and which can finally be closed as a bridge structure by connecting these cantilevers. The disadvantage of using such overhang construction vehicles is that of the two overhang construction vehicles that are constructing one T-shaped cantilever, one of the vehicles is always used to construct one of the bridges. The other case is that you have to work in the opposite direction to this overhang erection direction.

The special structure of this projecting construction vehicle is that the work scaffolding is located under the bridge superstructure, and the formwork is supported there. This entails the fact that this overhanging construction vehicle cannot pass over the piers of multi-span bridges. In addition, this overhang construction vehicle, which is supported on an already completed bridge section and is projected for the construction of the next overhang section, is capable of supporting at least the superstructure section provided directly above the piers and at least the corresponding overhang section. Only when the first overhang section in the direction has already been concreted can it be rammed onto its piers. Carrying out this work requires suitable formwork, which must be attached to the piers or supported on the ground surface. This can be done on the roadway board above the superstructure, below the roadway board, or partially above the roadway board, and partially below the roadway board.

Therefore, in the case of a construction method in which prestressed concrete bridges are constructed by cantilevering each section,
This is an overhanging erection device that supports the formwork and has a traveling device.
It is known to run on rails fixed to the outer surface of the outer belly plate. Two traveling devices are placed on each side of the bridge structure, and ``Through the overhanging part of the concrete casting scaffold, tension is applied to the thing in front of it, and compression is applied to the thing behind it.'' (cf. German Patent Application No. 1 152 124) In the case of other known devices for cantilever erection of sections of girder bridges, truss-like shoring is installed on the already erected superstructure sections; This overhangs beyond the tip of the cantilever beam, and at this overhang, a suspended concrete scaffolding is supported by a hanging village.

(German Patent No. 973 407), this known device is supported by a front main running gear which rests on running rails in an overhanging section which has been concreted in front of it, and which is subsequently Then, one floating boat will be anchored on the superstructure. Finally, the outer formwork for all of the superstructures on the underside of the roadway board is itself rigid and self-supporting, with multiple Devices for overhanging erections which are connected by longitudinal girders are also known.

(DT-OS German Published Application No. 2240678)
In this device, the load based on the overhanging part of the concrete casting scaffold when moving forward is supported by the roadway board through gate-shaped rigid frames that sandwich the roadway board from the sides and are equipped with a traveling device. , while the longitudinal girder is pressed against the overhanging part of the roadway board from below by the rear machine. In connection with this overhanging construction vehicle, in order to be able to construct a bridge girder with varying girder heights, the bottom form was made to be rigid against lateral bending.
It is also already known to configure the device so that its height can be changed. Furthermore, in order to allow the overhang construction work vehicle to pass through the bridge piers, the bridge structure is divided into two parts, and both parts are suspended using hoisting rocks that can run on auxiliary girders installed at the top of the roadway. It is also known to make it so that it can be divided along the longitudinal central axis so that it can be lowered. Furthermore, it is also known to use two overhang construction vehicles of this type to place concrete in the superstructure construction section directly above the bridge piers.

(See German Patent Application Announcement No. 22 Private Patent No. 5). For this purpose, the rear part of the projector can be laterally connected, so that the two projectors can be interconnected at their respective rear parts. It looks like this. In this state, the two overhang construction vehicles are once again suspended from the auxiliary girder supported by the head of the relevant pier. Each of the various types of overhang construction devices described above has been devised for a specific purpose and has advantages only for that purpose.

As a result of its simple embodiment, the first described type of undercarriage-moving overhanging vehicle is only suitable for creating serrated joints between the individual overhang sections. This ensures that the majority of the weight of each constructed overhang section, not including the loads of the overhang construction vehicle, is transferred directly to the already completed superstructure section. .In the case of an overhanging construction vehicle that moves the upper part,
The expensive shoring structure from which the concrete pouring scaffold is suspended "cuts off a large area of the path leading to the construction site at the end of the cantilever. Hanging villages are used to suspend the concrete pour scaffold. This makes the construction of curved bridges difficult, since the suspension members are always installed vertically. By forming
Overhang construction vehicles are extremely heavy. In other words, this overhanging vehicle is used only for box girders with oblique outer panels, in which case demolding is already carried out simply by lowering the overhanging vehicle. SUMMARY OF THE INVENTION The object of the invention is to design an overhanging installation of the type originally described in such a way that it can be used universally with reduced construction costs.

According to the present invention, this problem is solved as follows.

In other words, a wall in which longitudinal girders for scaffolding for concrete pouring are provided on both sides of the longitudinal girder base plate of the superstructure, and in some cases are connected to diagonal stiffeners by cross girders to form a three-dimensional support. a truss girder with a concrete casting scaffold fixed to the lower area of the truss girder, each truss girder having at least one substantially rectangular truss face with a vertical section in the overhanging area; "It has a triangular truss with an upper horizontal member in the rear range in the overhang construction direction, and the rear node part of the triangular truss, the square truss and the triangular truss are used to support the traveling device against the traveling rail. The support structure comprises at least one ...
Basically, it is formed as a wall-like truss girder with a square truss surface and, in the rear range with respect to the overhang erection direction, a node is provided above and forms a triangular truss that connects to the previous truss surface. It is convenient.

Conveniently, running devices for support against the running rails are provided on each side of the erection device at the nodes of the triangular truss and at the upper joint contacts between the square truss and the triangular truss. In a triangular truss, "the diagonal members are hinged at their ends according to the purpose, while the diagonal members as well as the horizontal members can be of variable length. In this case, the diagonal members are telescoped. It can be formed as a shaped pipe, while the horizontal section can be run horizontally in guides attached to the upper connection nodes. ~ You can try to change its height.

Here, the cross beam of the scaffold for concrete placement can be configured to have guides attached to both ends thereof, and to be installed so as to move step by step along the supporting structure with respect to the vertical guide rail. Conveniently, the guide tube is designed as a sliding tube in which the vertical members of the truss can be gripped as guide rails. The entire device can be split along the central longitudinal axis for subsequent transport across the piers.

The rattan girder of the concrete scaffolding can also be hinged to the guide. Furthermore, it is known per se that it is possible to attach to the supporting structure a gate-shaped rigid frame that sandwiches the superstructure from the side against a handle from a transfer device that runs on an auxiliary girder arranged above the superstructure. It is a place.

The advantage of this inventive device is that the support structure, which is installed on the side of the bridge and has crossbeams and diagonal stiffeners, is located exclusively under the bridge superstructure and does not interfere with the area above the roadway. The point is that any practical formwork constituent material for the superstructure can be installed on and within the three-dimensional structure.

A distinct advantage is the construction of the support structure as a wall-like truss girder, which allows the tension chords, compression chords and diagonals to be widened to a large extent so that they can take on the loads of the concrete pouring and thus extend the already completed superstructure sections. This results in a very lightweight yet exceptionally rigid structure for transmitting signals to the The rear part of the support structure is telescoped, so
The possibility arises of interconnecting two such devices at the rear.

If this connection is made through tension and compression members as well as diagonal stiffeners, then two such riggers can be joined together on one side of a rigid support in one bend, without straining the auxiliary girder. Loads can be transferred directly to the piers, so that the auxiliary girder only plays a role in transporting the unloaded overhanging equipment and can therefore be lightweight. Further details, characteristic and advantageous performance of the enchantment will become apparent from the following description of the exemplary embodiments shown in the drawings.

In Figures 1a and 1b, the characteristic construction status of the bridge structure between Tama during construction is schematically shown.

Figure la shows the pier army on which the already erected part of the superstructure 2 rests. The superstructure 2 is constructed successively into individual overhang sections 2a, 2b, 2c, and 2d with the help of two overhang erection devices 1 and 0 called "overhang erection work vehicles." Ru. The two overhang construction vehicles 1 and the gourd, supported on the already completed part of the superstructure, are just in position for constructing the construction section 2d. In FIG. 1b, the construction of the next pier 3 of the bridge structure is shown starting.

Here, although further explanation will be added later, two overhang construction work vehicles 1 are connected to each other at the rear end of the crest, and play a role in the construction of the first overhang construction section 2a directly above the bridge pier. accomplish In FIG. 2, the cantilever construction vehicle 1 is shown on an enlarged scale in the position for constructing the cantilever construction section 2d, as can be seen from FIG.

The overhang construction vehicle 1 consists of two wall-shaped truss girders 4a and base b, which are installed on both outer sides of the superstructure 2. (Figures 3 and 4) Truss girders 4a and 4b
The basic supporting components are a front end vertical member 5 and a rear end vertical member 6, a lower horizontal member 7, an upper horizontal member 8 and a diagonal village 9 forming a substantially square truss surface;
Connected to the rear of these is a triangular truss surface composed of a horizontal member 10 and an oblique pipe support core 11. The pipe support 11 is hinged at an upper node 12 and a lower node 13 at the rear, and this consists of the gap portions 11a and 11b, and is telescopic.
centre. They can be slid against each other in a shape. A bridge-like guide 15 is installed at the truss node 14 in the upper center.
is attached so that the horizontal part 10 at the rear of the upper part can be slid in the horizontal direction. The two truss girders 4a and 4b are connected to each other at the lower side of the upper Kudo section by a front cross-beam 16 for bottom formwork and a cross-beam 17 for bottom formwork at the rear.

In order to carry out an additional Tachibana Okayama, diagonal supports (placing) are installed in the bridge cross-section defined by the vertical section 5 in front of the overhang section to be constructed. This has been omitted for clarity. At the front of the overhang construction vehicle, that is, at the front of the bridge section to be constructed, there is a work shoring structure equipped with a work scaffold 18. Various auxiliary components are shown only in outline and do not require detailed explanation. In the upper region of the truss girders 4a and 4b, i.e. the upper end of the vertical member 6, the part of the cylindrical guide 15 and the rear node.
A traveling device is provided at the point 12, and the overhang construction work vehicle can travel along the traveling rail 19 using this.

The traveling rail 19 is fixed at a position below the overhanging portion 20 of the roadway board 21 on the outer side surface of the cross section of the superstructure. The running wheels 22 run along the lower flange of the running rail 19, and thereby the overhanging construction vehicle 1 moves to the rear node 1.
Corresponding to the load exerted by the support wheels 23 which are supported against the underside of the running rail 19 in the area 2, this is suspended on the superstructure via tension members 24 and is applied to the roadway board 21 via hydraulic jacks 28. It is supported against the lower surface of the overhanging portion 20 of. In the concrete placement state shown in FIGS. 2 to 4, when the full load due to the weight of the exposed construction section 2d is applied, the load applied to the running rail 19 and its hanging material 24 is removed. In order to
The overhanging construction vehicle is fixed at one end to the rear bottom formwork crossbeam 17, passes through the superstructure, diagonally upwards, and then connects to the roadway board 21.
Tension members 2 anchored to short crossbeams 27 on the top surface of
6.

(Figure 4). Via a hydraulic jack 28, a tension member 25 is tensioned against the lower green 30 of the superstructure cross section in order to relieve the load of the rear support of the projecting construction vehicle. For concrete pouring, the formwork portion for the superstructure is assembled on the bottom formwork scaffolding 31. This formwork can basically be formed arbitrarily and therefore does not need to be described in detail here. After the concrete in the overhang section has hardened and the formwork section has peeled off from the concrete, the overhang construction vehicle then moves forward by the length of the overhang section to a new construction start position.

At this time, the overhang construction work vehicle is suspended from the lower flange of the running rail 19 via the running wheels 22, and is supported by the lower flange of the zero running rail 19 via the support wheels 23. For traveling movement, a hydraulic jack and a hook are provided, one end of which is attached to the horizontal member 8, and the other end of which is attached to the traveling rail 19.
This is carried out using a propulsion device 32 supported by. This propulsion device 32 is also used for the advancement of the running rail 19 in a reverse manner. To this end, after fixing the overhanging vehicle to the superstructure, the running rail 19 is lowered onto support wheels (not shown) in the area of support wheels 23 and running wheels 22. (Fig. 2) As soon as the construction work vehicle 0, which was in operation after the construction progressed beyond the construction state shown in Fig. It must be moved to the construction vehicle 1 and the pier at Kawamatsugi.

For this purpose only, the truss girders 4a and 4b are provided with gate-shaped rigid members 33 that sandwich the upper construction section from the sides. Hanging members can be attached to the upper cross-members 34, which are interconnected by the longitudinal beams 35, by means of which the projecting construction vehicle can be suspended from the carriage. Although this traveling bogie is not shown in the diagram, it can run on the auxiliary girder that is located above the superstructure 2 and spans the gap between the already completed cantilever and the next pier. It looks like this. This allows each overhanging construction vehicle to pass through the piers and the two bottom formwork crossbeams 16.
and 17 are divided by the bridge longitudinal axis XX. Since the two bottom formwork cross beams 16 and 17 are connected to the truss beams 4a and 4b by means of hinges 36 at their respective outer ends, the halves created by releasing the central connection are , can be connected to the outside around this hinge. For the construction state schematically shown in Figure lb, that is, for the construction of superstructure section 2a directly above the pier, two overhanging construction vehicles are connected together at their rear ends. 1 and 2 in use are shown on a larger scale in FIG.

In this position, the rear horizontal member 10 of the overhanging vehicle is pushed into the interior of the cylindrical guide 16 by sliding it inside. At the same time, the pipe support 1 is also shortened and pivoted about the hinge within the nodes 12 and 13. A compression section 36 is mounted between the two nodes 13 and is connected to the two cylindrical guides by a tension member 37 . Additionally, diagonal stiffeners 38 are installed.
In this state, two overhang construction work vehicles 1 and a mountain,
They are interconnected rigidly against bending. The overhang construction vehicle transmits its vertical force directly to the head of the pier 3 under the central vertical member 6, and in this case, the vertical member is connected to the seat plate 3 above the pier head.
It is placed on top of 9. When moving the two overhang construction vehicles 1 and 2 forward from this position, the overhang construction section 2a
After this has been erected, the sections 10 and 11 forming the two rear triangular trusses are stretched again to the dimensions shown in FIG. In the case of the construction form of the overhanging construction work vehicle shown in FIGS. 6 to 9, the concrete hammering scaffold 40 supporting the formwork consists of truss girders 4a and 4b, bottom cross beams 41 and 42, and It is installed so that its height can be changed inside the supporting framework of the overhanging construction vehicle, which is formed from the front diagonal stiffener 43.

By doing this, it becomes possible to construct a bridge structure with variable girder height. Here, the concrete casting scaffold 40 is supported by a front scaffold cross beam 40a and a rear scaffold cross beam 40b.

Both have guides 44a and 44b attached to their weavings, which can grip the front vertical member 45 and the rear vertical member 46 and slide in this area. A tension member 47 is attached to the machine girders 40a and 40b or to the guides 44a and 44b, the length of which can be changed and whose length can be shortened to lift the concrete casting scaffold 40. This type of height variability of the concrete pouring scaffold 40 was created on the premise that it can pass through a bridge pier that is wider than the superstructure.

Such a case occurs, for example, in an autobahn bridge, where two divided superstructure cross sections are placed on top of a continuous bridge pier. Regarding the overhanging construction vehicle, if the bottom machine girder of the concrete casting scaffold is divided along the longitudinal center axis as described according to Figs. 2 to 4, then from Fig. 6 In the case of the overhanging construction vehicle shown in FIG. 8, both halves of the concrete casting scaffold 40 are opened next to each other at the hinges 48 attached to the guides 44a and 44b, and the hanging members 49 It can be pulled up on the sides using the At this time, the guides 44a and 44b are connected to the vertical sections 45 and 4.
6 (FIGS. 9 and 10) according to the height movement of the concrete casting scaffold 40.

[Brief explanation of the drawing]

Figures 1A and 1B are side views of two characteristic construction states during construction of a bridge structure, Figure 2 is a side view of the first construction form of the overhang erection device according to the present invention, and Figure 3 is A cross-sectional view taken along line mm in Figure 2, and Figure 4 is a cross-sectional view along line N-W in Figure 2.
A cross-sectional view along a line, Figure 6 shows two interconnected cantilever construction equipment during the construction of the superstructure section directly above the pier, and Figure 6 shows the subsequent construction of this cantilever construction equipment. Figures 7 and 8 are partial cross-sectional views taken along the skin-leg line and Kazeichibata line in Figure 6. Figures 9 and 10 are cross-sectional views taken when passing through a wide pier. FIG. 8 is a cross-sectional view corresponding to FIGS. 7 and 8 of the overhang construction device. The symbols in the figure are 16, 17... cross beams for front and rear bottom formwork, 19... running rails, 22, 23...
...Running wheels. Gawo. Re force 9 Fuaka 9.2 Line 9.7 庺 9.8 Tan 9.3 Force 9. Evening 9. Atari 9.5 Kata-9 Cloth 9. of

Claims (1)

[Scope of Claims] 1. For constructing a bridge structure made of reinforced concrete or prestressed concrete with a roadway plate provided at the upper part and extending laterally, and having a particularly closed box-shaped cross section, with a cantilever for each section. , provided on the underside of the superstructure and extending beyond the already completed part of the superstructure, supporting the formwork for the superstructure and under the interconnected longitudinal girders and overhang sections to be constructed. Traveling devices which are stationary on the side transverse beams and which are arranged along both outer sides of the longitudinal girder sides of the superstructure by means of running devices and which are fixed to already completed parts of the superstructure. In a device consisting of a concrete casting scaffold supported so as to be able to run along a rail, a transverse beam in which the longitudinal girders for the concrete casting scaffold are provided on both sides of the longitudinal girder base plate of the superstructure. 16, 17; wall-shaped truss girders 4a and 4b which are sometimes connected to diagonal stiffeners by 41, 42 to form a three-dimensional support, with concrete in the lower area of the truss girder. The pouring scaffold is fixed and each truss girder has vertical members 5, 6; 4 in its overhanging area.
At least one with 5, 46 has a rectangular truss surface and has a triangular truss with an upper horizontal member 10 in the rear region in the direction of the overhang, and the running devices 22, 23 have a running rail 19. A device characterized in that it is installed at the rear node 12 of the triangular truss and at the upper joint node 14 between the square truss and the triangular truss for bearing against the truss. 2. The support structure is constructed as wall-like truss girders 4a, 4b, each of which has at least one essentially square truss surface with vertical members 5, 6 in the extent of its overhang and 2. The device according to claim 1, wherein a node 14 is provided at the upper part of the truss surface in a rear region with respect to the construction direction, forming a triangular truss surface connected to the previous truss surface. 3. A running device 22 is installed at the node of the triangular truss surface on each side of the device and at the upper joint node 14 between the square truss and the triangular truss to be supported by the running rail 19.
3. The apparatus according to claim 1 or 2, wherein: and 23 are installed. 4. A patent claim characterized in that in each triangular truss, a diagonal member 11 is hingedly connected at both ends, and the length of the diagonal member 11 and the horizontal member 10 can be changed. Apparatus according to any one of ranges 1 to 3. 5. The device according to claim 4, wherein the diagonal member 11 is formed of a telescopic pipe. 6. Device according to claim 4 or 5, characterized in that the horizontal member 10 can be slid horizontally into a guide 15 attached to the upper connection node 14. 7. The device according to any one of claims 1 to 6, characterized in that the height of the concrete casting scaffold can be changed with respect to the supporting structures 4a, 4b. 8 Cross beams 41 and 42 for concrete placement scaffolding 40 are:
8. Device according to claim 7, characterized in that it has guides attached to its ends and is arranged to slide along the support structure relative to a vertical guide rail. 9 The guide is formed as sliding tubes 44a and 44b,
9. Device according to claim 7, characterized in that the vertical members 5, 6 of the truss are gripped as guide rails. 10. According to any one of claims 1 to 9, characterized in that the entire device can be divided along the central longitudinal axis in order to be transported beyond the pier. equipment. 11. The device according to claim 10, characterized in that the cross beams 41, 42 of the concrete casting scaffold 40 can be joined together in a hinged manner at a guide portion. 12 From claim 1, characterized in that a gate-shaped rigid frame 34 that sandwiches the superstructure from the side is attached to the supporting structure with respect to a handle from a transfer device that runs on an auxiliary girder installed above the superstructure. 11.