JP2007070992A - Hanging floor slab bridge, method of laying the same, and bogie for floor slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deck type hanging floor slab bridge which enables a hanging floor slab to be smoothly arranged along a predetermined curved line, and to provide a method of laying the same, and further to provide a carriage for a floor slab. <P>SOLUTION: Reaction force is taken by a temporary hanging cable 5 in the hanging floor slab bridge. The hanging floor slab bridge is provided with a floor slab block 23 arranged with its height adjusted by a jack 22 and a main cable 40 and a supporting material 28 which are arranged below the floor slab block 23 after the height of the floor slab block is adjusted. A predetermined tension is imparted to the main cable 40. The carriage 1 for the floor slab is supported by the temporary hanging cable 5 and the floor slab block 23 is supported by the jack 22 on the bogie 1 for the floor slab. The floor slab blocks 23 are joined with each other after the height of the floor slab blocks are adjusted by the jack 22, and the main cable 40 is arranged below the floor slab blocks 23 and a supporting material 28 which connects the floor slab block 23 with the main cable 40 is arranged. Thereafter a predetermined tension is imparted to the main cable 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a suspended floor slab bridge, a method for installing the suspended floor slab bridge, and a floor carriage.

  Conventionally, a self-contained upper suspension bridge (a stringed girder bridge) is generally used by tensioning a suspension cable (a stringed cable) after a main girder is constructed using a fixed support or an installed girder (such as an installed girder). It has been constructed.

  However, if the fixed support work cannot be installed due to the space under the girder, or if the span girder is longer than 50m and the installation girder cannot be installed, the construction method using these fixed support works or installation girder is applied. Can not.

  As a construction method when the fixed support or the construction girder cannot be installed, it has the advantage that it can be constructed at low cost without using a large construction machine. (1) Girder end block on the abutment Forming and securing, passing a cable over each spar end block, feeding the segment floor slab supported by the cable, passing a second cable under the segment floor slab, and passing the second cable There is known a construction method of a stringed girder bridge in which the tension is leveled (see, for example, Patent Document 1).

  (2) A large number of girder members serving as upper girder are arranged on the cable installed between the abutments, and a support member is provided on the lower side of each girder member. There is also known a construction method in which a girder member is pushed up by connecting and fixing under a support member and the amount of deflection of the main cable is reduced, and the girder members adjacent in the bridge axis direction are connected and integrated (for example, patents) Reference 2)

By the way, when constructing a suspended floor slab such as an upper suspension type slab bridge, after the first segment floor slab 50a is sent out as shown in FIG. 12 (a), two sheets as shown in FIG. 12 (b). When the segment floor slabs 50b are sent out and are erected in such a manner that the segment floor slabs 50c to 50d are sent out to the suspension cables 40 one by one as shown in FIGS. 12 (c) to 12 (d). Since the bending of the suspension cable 40 changes for each sheet 50a to 50d, as shown in FIG. 12 (b), the first segment floor slab 50a and the second segment floor slab 50b contact each other. The position shift L occurs in the floor slab thickness direction, not the predetermined position where the position matches the floor slab thickness direction. Similarly, as shown in FIGS. n-th) segment floor slabs 50b-50c, and third-fourth ( (n + 1) th segment floor slabs 50c to 50d is not a predetermined position where the contact position matches the floor slab thickness direction, but a positional deviation L occurs in the floor slab thickness direction. The plates 50a to 50c are stressed, and finally an error occurs due to a difference in the contact state of the segment floor slab with respect to a predetermined curve. In such a case, the tension of the suspension cable (main cable) 40 is smooth. There was a problem that the curving property of the segment slab could not be obtained.
Similarly, even when an upper road slab bridge is erected, linearity of the upper road slab cannot be obtained by such an erection method that causes a displacement in the thickness direction of the slab as described above.
JP 2003-138523 A Japanese Patent No. 2967874

  As described above, when an upper suspension type slab bridge is installed, there is an error due to the difference in the contact status of the suspended slabs (segment slabs or floor slab blocks) adjacent to the bridge axis direction with respect to the predetermined curve. Can also be easily adjusted, and the position of the suspended floor slab can be adjusted to match the final predetermined straight line or curve. It is an object of the present invention to provide a suspended floor slab bridge in which a floor slab can be smoothly placed without causing a level difference, a construction method thereof, and a floor trolley carriage.

In order to solve the above-mentioned problem advantageously, in the suspended floor slab bridge of the first invention, in the suspended floor slab bridge, a reaction force is applied to the temporary suspension cable and the floor slab block is arranged by adjusting the height with a jack. And a main cable and a support member disposed below the floor block after the height of the floor slab block is adjusted, and a predetermined tension is applied to the main cable.
Further, in the construction method of the suspended floor slab bridge of the second invention, the floor slab carriage is supported by a temporary suspension cable, the floor slab block is supported by the jack on the floor slab carriage, and the floor is supported by the jack. After adjusting the height of the slab block, the floor slab blocks are joined together, the main cable is arranged on the lower side of the floor slab block, and the support material for connecting the floor slab block and the main cable is arranged, and then A predetermined tension is applied to the main cable.

  The floor slab transport carriage according to the third aspect of the invention is a floor slab transport carriage used in the construction method of the self-contained upper road slab bridge according to the second aspect of the invention, and is a carriage main body having a temporary suspension cable support saddle. A suspension scaffold supported by being suspended below the bogie main body, and a plurality of floor slab height adjusting jacks at an upper portion of the bogie main body and spaced apart in a bridge axis direction and a direction perpendicular to the bridge axis. It is characterized by being.

According to the first invention, the reaction force is applied to the temporary suspension cable, and the floor slab block is arranged by adjusting the height with the jack, so that no step is generated between the end portions of the floor slab block in the bridge axis direction. In this way, the floor slab block is precisely arranged along a predetermined straight line or curve, and is directly or indirectly connected to the floor slab block at the exact position whose height is adjusted. Because it is a main cable and support material, the main cable and support material can be placed at an exact position corresponding to the floor slab block. It can be a precision suspended floor bridge.
According to the second invention, the floor slab transportation carriage is supported by the temporary suspension cable and the height of the floor slab block is adjusted by the jack on the floor slab transportation carriage, so that the floor slab block has a predetermined curve. The height can be adjusted smoothly with a jack so that there is no step between the ends of the floor slab blocks in the bridge axis direction. Further, since the floor slab blocks are joined in this state, a suspended floor slab bridge without a step between the end portions of the floor slab block can be obtained. Therefore, it is possible to easily lay a suspended floor slab bridge such as an upper suspension type suspended floor slab bridge having a smooth suspended floor slab by arranging the floor slab blocks continuous in the bridge axis direction without a step.
According to the third invention, the height position of the floor slab block can be adjusted and supported by the height adjusting jack at the top of the floor slab carriage, and the floor slab carriage can be supported by the cable support saddle. In this state, the main cable can be arranged in the bridge axis direction using the scaffolding below the floor slab carriage, and the main cable and floor slab block are connected in the floor slab carriage. Since the supporting material to be arranged can be arranged, the arrangement work of the main cable and the supporting material can be installed with high accuracy in a stable state by using the floor carriage.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  First, with reference to FIG. 6 to FIG. 8, particularly FIG. 7, FIG. 8, and FIG. 11 showing a part of FIG. 7 in an enlarged manner, the configuration of the floor slab carrier 1 according to an embodiment used in the present invention will be described. Then, a plurality (four in the illustrated case) of temporary suspension cable support saddles 3 are fixed to the lower portion of the saddle support member 2 made of an H-shaped steel material extending in the direction perpendicular to the bridge axis at intervals in the direction perpendicular to the bridge axis. Has been.

  On the lower surface side of the temporary suspension cable supporting saddle 3, a plurality of downwardly opening groove-type concave grooves 4 extending in the bridge axis direction (two in the illustrated case) are provided in the direction perpendicular to the bridge axis. The lower surface of the groove 4 is placed on the temporary suspension cable 5.

  In order to reduce friction with the temporary suspension cable 5, an ethylene tetrafluoride plate having a circular arc section is interposed in the concave groove 4.

  Saddle support members 2 having a plurality of saddles 3 are arranged in parallel at intervals in the bridge axis direction, and are arranged in parallel so as to extend in the bridge axis direction over the top of each saddle support member 2. A plurality of support members 6 made of a pair of H-shaped steel materials are placed in parallel on the both sides in the direction perpendicular to the bridge axis at a distance from each other (a total of four, two in the illustrated case). The upper flange 2a in the saddle support member 2 and the lower flange 6a in each support member 6 are detachably fixed and integrated with bolts and nuts to form a lower support frame 7.

  A pair of vertical frame members 10 are connected and integrated by a horizontal connecting member over a supporting member 6 adjacent in the direction perpendicular to the bridge axis on one side and the other side of the lower support frame 7 in the direction perpendicular to the bridge axis. A plurality of (two in the illustrated example) gate-type frames 8 having a height adjusting function are arranged at the upper and lower portions of the frame member 10 at intervals in the direction perpendicular to the bridge axis, and at intervals in the bridge axis direction. A plurality (four in the illustrated case) are arranged in parallel, and the seat plate at the lower end of each leg 9 in each portal frame 8 is placed on the support member 6 and is detachably fixed by bolts and nuts. Has been.

  The upper part of the leg portion 9 made of a vertical screw rod with a female screw member 12 having a turning handle 11 screwed into a lower vertical hole (not shown) inside each vertical frame member 10 in the portal frame 8 is fitted and disposed. By rotating the turning handle 11, the female screw member 12 is raised or lowered with respect to the leg portion 9, so that each vertical frame member 10 supported by each female screw member 12, that is, the height of the portal frame 8 is increased. The position is adjustable. In addition, the seat board 13 is attached to the lower end part of the leg part 9 which consists of a vertical screw rod.

  In the upper hole (not shown) in each vertical frame member 10 in the portal frame 8, the lower part of the height adjustment support member 16 provided with a vertical screw rod 16 a into which a female screw member 15 having a turning handle 14 is screwed. Further, a support member 17 having an open groove shape in cross section is attached to the upper portion of the vertical screw rod 16a. The turning handle 14, the vertical screw rod 16 a and the support member 17 constitute a height adjustment support member 16.

  The upward opening grooves of the support members 17 in each of the adjacent portal frames 8 spaced apart in the direction perpendicular to the bridge axis (left-right direction) are arranged in series at intervals in the direction perpendicular to the bridge axis. An upper support member 18 made of an H-shaped steel material is disposed in the upward opening groove of each of the support members 17 and is placed on each of the support members 17 and is detachably attached by bolts, nuts, or the like. Four upper support members 18 are arranged in parallel on the floor slab carriage 1 at intervals in the bridge axis direction.

  In each of the portal frames 8 arranged at intervals in the bridge axis direction, horizontal frame members 19 extending in the bridge axis direction are provided on the upper and lower sides of the vertical frame members 10 on both the left and right sides. The steel brace (not shown) is arranged in an X shape as appropriate over the vertical frame material 10 that is arranged over the material 10 and integrated with a known pipe clamp 20 for pipes. ) Are arranged in a tensioned state and integrated.

  A plurality of jack support members 21 made of a pair of H-shaped steel members arranged in parallel so as to extend in the bridge axis direction are spaced apart from each other in the direction perpendicular to the bridge axis (illustrated) on the upper flange of each upper support member 18. 2), the lower flange of the jack support member 21 is placed, and the upper flange of the upper support member 18 and the lower flange of the jack support member 21 are bolts and nuts (not shown). Is detachably attached.

  A plurality (six in the illustrated embodiment) of height adjustment jacks 22 are placed on each jack support member 21 at intervals in the bridge axis direction, and are detachably attached by bolts and nuts. Yes. The illustrated height adjusting jack 22 is a screw telescopic jack provided with a female screw member 12 having a turning handle. The height adjusting jacks 22 are arranged at least two in the direction perpendicular to the bridge axis and at least two in the direction perpendicular to the bridge axis, for a total of four, and are supported at four points by at least four front, rear, left and right jacks. Thus, a segment floor slab 23 made of precast, which will be described later, is supported, and a plurality of segment floor slabs 23 can be supported.

At least one of the segment floor slabs 23 is transported in the bridge axis direction while being supported by a plurality of height adjusting jacks 22. In the illustrated embodiment, one floor slab transport cart 1 is transported. In addition, three segment floor slabs 23 are mounted at predetermined intervals in a state where they are appropriately supported and temporarily fixed by the height adjusting jack 22 or the like in the bridge axis direction.
In addition, between the floor slabs 23 adjacent to each other in the bridge axis direction on the transport slab 1 for the slab, there is provided a joint gap in which a grout such as an expandable mortar is filled later.
In the embodiment of the present invention, since all the segment floor slabs 23 on one floor slab transport carriage 1 are finally integrated, these are set as one set of floor slab blocks 23. The floor slab block 23 is provided with a set of support materials 28 such as a vertical material or a diagonal material. When two segment floor slabs 23 are provided in one floor slab carriage 1, two segment floor slabs 23 form one floor slab block 23. In this way, the height dimension in the vertical direction relative to the length in the bridge axis direction of the floor slab transport cart is relatively larger than that in the case where one floor slab transport cart is used for one segment floor slab 23. It becomes low and can improve the stability of the floor slab carriage 1. However, in the present invention, the case where one segment floor slab 23 is used for one floor slab carriage 1 is not denied, and the length dimension in the bridge axis direction of one segment floor slab 23 is not denied. It is also possible to lengthen the length dimension of the floor slab transport carriage 1 in the bridge axis direction.

  The floor support carriage 1 for transporting the floor block 23 is constituted by the lower support frame 7, the gate frame 8, the height adjustment support member 16, the height adjustment jack 22, the suspension scaffold 30, and the like. Yes.

  On the outer side of the jack support member 21 arranged at a distance in the direction perpendicular to the bridge axis, a scaffold member 24 is constructed over the upper support member 18 adjacent in the bridge axis direction, and the end portion of the upper support member 18 is also provided. Is provided with a vertical shaft bearing portion and the like, and a lower portion of the vertical rod 25 is attached, and a handrail horizontal rod 26 is attached to each vertical rod 25 by a clamp fitting (not shown), and the protective fence 27 Is configured.

  No members other than the upper support member 18 (including the scaffolding material) are disposed in the lateral direction between the jack support members 21 located on the inner side in the direction perpendicular to the bridge axis. Similarly, no member other than the upper support member 18 is disposed in the lateral direction between the support members 6 positioned on the inner side in the direction perpendicular to the bridge axis in the lower support frame 7. By doing so, the space between the upper support members 18 and the saddle support members 2 adjacent to each other in the bridge axis direction becomes a space portion, and a support material 28 (see FIGS. 6 and 9) described later is placed on this portion as a scaffold. The floor slab carriage 1 can also be arranged in the floor slab.

  Each saddle support member 2 in the lower support frame 7 is attached with an upper portion of a plurality of suspension support members 29 at intervals in a direction perpendicular to the bridge axis, and the horizontal frame material in the suspension scaffold 30 by each suspension support member 29. 19 is suspended and supported, and scaffolding material 24 is constructed over each horizontal frame material 19.

  The floor slab carriage 1 that transports and supports the precast segment floor slab 23 is constituted by the lower support frame 7 and the gate frame 8 including the saddle support member 2 including the saddle 3 and the height adjusting jack. Has been.

  As shown in FIG. 6, a segment floor slab 23 made of precast or the like is placed so as to be supported by each height adjustment jack 22, and the upper portion of the jack 22 and the lower surface portion of the segment floor slab 23 are appropriately The segment floor slab 23 is installed on the floor slab carriage 1 by temporary fixing means (not shown).

  Next, the construction method of the suspended floor slab bridge of the present invention using the floor slab carriage 1 will be described.

  First, as shown in FIG. 1, an abutment 31 that is opposed to each other with an interval as an abutment serving as a reaction force support portion is anchored to the ground 33 by a plurality of ground anchors 32, and a temporary suspension cable is attached to each abutment 31. A plurality of (eight in the case of illustration) casing pipes made of steel or the like for inserting the ends of 5 are arranged at intervals in the direction perpendicular to the bridge axis and penetrate the abutment 13 in the bridge axis direction. Secure by embedding.

  Each abutment 31 is provided with a plurality of winches 34 in a direction perpendicular to the bridge axis, and a support wire 35 such as a steel rope is arranged across the drum of each winch 34 to provide a plurality (eight in the illustrated case) of prefabs. The tip end sides of the temporary suspension cables 5 made of cables are respectively inserted into the casing pipes of the one abutment 31 and the tip ends of the temporary suspension cables 5 are connected to the support lines as shown by the two-dot chain lines in FIG. The winch 34, 34 is driven while being supported by 35 and the temporary suspension cable 5 is fed out while winding the support wire 35 around the drum of the winch 34.

  Then, the end of each temporary suspension cable 5 is attached to each abutment 32 on the back side of the abutment 31 and the temporary suspension cable 5 is tensioned in advance by a jack or the like, and a known suspension cable insertion sleeve and wedge are provided. The temporary suspension cable 5 is fixed by a wedge-type fixing tool or the like using the, and each temporary suspension cable 5 is installed (stretched) between the abutments 31. By using a prefabricated cable as the temporary suspension cable 5, it is possible to omit the grout operation into the outer tube made of a steel casing tube or the like.

  Next, as shown in a side view of FIG. 2 and a front view of FIG. 6, the floor slab transportation carriage 1 is placed on a plurality of temporary suspension cables 5, and a plurality of heights in the floor slab transportation truck 1 are set. A segment floor slab 23 made of a precast plate or a steel shell or the like is temporarily fixed on the height adjusting jack 22 with a crane 44 or the like, and the support wire 35 is temporarily fixed to the floor slab carriage 1 or this. Temporarily fixed to the segment floor slab 23, the winch 34 is driven, and as shown by arrows in FIG. 2, the floor slab carriage 1 is slid on the temporary suspension cable 5 to a predetermined position in the bridge axis direction. Move and move. Similarly, the floor slab carriage 1 following the floor slab carriage 1 is also placed on the temporary suspension cable 5 to install and transport the segment floor slab 23. Such a transportation process of the segment floor slab 23 is repeated as many times as necessary, and as shown in FIG. 3, the necessary number of segment floor slabs 23 are arranged between the abutments 31 with an interval close to the bridge axis direction.

  In addition, between the suspension scaffolds 30 between the floor slab carriages 1 close to the bridge axis direction, a connection scaffold 30a is temporarily installed to form a suspension scaffold continuous in the bridge axis direction. ) And support material installation. Further, an in-slab cable 37 that is continuous in the bridge axis direction is inserted and disposed in the horizontal through hole 36 in the bridge axis direction in the segment floor slab 23.

  The height of the segment floor slab 23 is adjusted by adjusting the amount of expansion / contraction of the height adjusting jack 22 attached to each floor slab carriage 1, and the vertical direction is applied to the end of the segment floor slab 23 adjacent to the bridge axis direction. The position of the vertical direction or the inclination angle is adjusted so that no step occurs.

  Next, as shown in FIG. 3, the end portion place-placed slab block block is connected to the segment floor slab 23 at the end portion in the bridge axis direction, and the abutment 31 is supported at one end by the support device 38. 39 is built. In constructing the end portion place slab slab block 39, in order to construct a part so as to protrude from the abutment 31, a support work supported by the abutment foundation portion may be provided and constructed.

  The above-mentioned end place-placed floor slab block 39 is a part that constitutes the main girder 48 together with the segment floor slab 23 and the cable 37 in the floor slab that is inserted and arranged on the inside thereof. This is a fixing block for tensioning and fixing the end portion of the cable 37 in the floor slab and tension fixing the main cable 40 to form a self-supporting suspended floor slab bridge. Further, the expandable mortar is filled and cured in the joint portion 23b between the adjacent segment floor slabs 23 between the abutments 31. In addition, a cable in the floor slab (intra-girder cable) 37 disposed in each segment floor slab 23 is inserted and disposed in a lateral hole in the end portion place-placed floor block 39.

  Next, as shown in FIG. 6, a plurality of (three in the illustrated case) main cables 40 as suspension cables for main installation are used by using the suspension scaffold 30 in the floor carriage 1 that also serves as a scaffold. The main cables 40 that are arranged and parallel to each other are joined and integrated by a mounting bracket 42 such as a split type. Further, an end portion of the main cable 40 is inserted and disposed in the through hole of the end portion place-placed slab block 39, and the tension device (not shown) is arranged on the outer side in the bridge axis direction of the end portion place-placed block block 39. Lock it.

  Further, at the center in the bridge axis direction in each floor slab carriage 1, a plurality of support members 28 (three in the case of illustration) in the same plane in the direction perpendicular to the bridge axis, one in the center and the bridge Arranged so that two of them are symmetrical in the direction perpendicular to the axis, the upper end of each support member 28 extends in the direction of the bridge axis so that it becomes a hinge in the direction of the axis of the bridge to the mounting bracket 42 on the lower surface side of the segment floor slab 23 The lower end of the support member 28 is attached to the main cable 40 for installation by the horizontal shaft 41 extending in the bridge axis direction so that the bridge axis direction becomes a hinge.

  In order to attach the upper and lower ends of the support material 28 in this way, the upper and lower ends of each support material 28 are provided with joint portions having horizontal axis insertion holes penetrating in the bridge axis direction, and the lower side of the segment floor slab 23 Is provided with a mounting bracket 42 having a horizontal axis insertion hole penetrating in the bridge axis direction, and similarly on the upper piece 45a side of the split-type binding bracket 45 for binding the three main cables 40 for permanent installation. Is provided with a mounting bracket 42 having a horizontal axis insertion hole penetrating in the bridge axis direction.

  The bundling bracket 45 is configured by bundling a plurality of (in the illustrated case, three) half-divided pieces having fitting grooves with a semicircular cross section for fitting a main cable in a direction perpendicular to the bridge axis with bolts or the like. It can be easily provided at an appropriate position in the longitudinal direction of the main cable, and the fitting groove of the semicircular cross section is slightly smaller than the half cross section of the main cable 40 and is fixed to the main cable 40 by crimping. Has been.

  Of the three segment floor slabs 23 on each floor slab carriage 1, the support material 28 is attached only to one segment floor slab 23 located in the center in the bridge axis direction. Mounting brackets 42 are provided only on the lower surface side, and the mounting brackets 42 are not provided on the segment floor slabs 23 on both sides in the bridge axis direction, but the other structures are similar in structure to each segment floor slab 23. is there. In addition, with respect to the segment floor slab 23 located in the center of the bridge axis direction, the segment floor slab 23 adjacent in the bridge axis direction is joined by the joint portion at the edge of the floor slab and inserted into all the segment floor slabs 23. The floor slab cable 37 to be used is inserted and arranged, and the tension is fixed and integration is achieved.

  As described above, it is not necessary to provide the support material 28 for each segment floor slab 23 on each floor slab carriage 1, and in the illustrated embodiment, all the members disposed on the floor slab transportation carriage 1 are provided. Since the segment floor slab 23 (three in the case of the illustrated embodiment) is set as one block and the support material 28 is provided for each block, the number of the support materials 28 can be reduced, which is economical. It is said to be a suspended floor slab bridge.

  Further, in the floor slab carriage 1 configured as described above, the leg 9 and the vertical frame member 10 and the height adjustment support member 16 in each floor slab transport truck 1 arranged side by side in the bridge axis direction. By simply adjusting the length dimension in the vertical direction (for example, just adjusting the length dimension of the vertical frame member 10), the basic configuration of the floor slab carriage 1 arranged in the bridge axis direction is made common. Yes. Further, the height adjustment device for the upper and lower portions of the portal frame 8 (the leg portion 9 with the female screw member 12 provided with the height adjustment support portion 16 and the turning handle 11) is finely adjusted in the vertical direction. Therefore, the assembly configuration of the floor slab carriage 1 arranged in the bridge axis direction is facilitated.

  With the floor slab cables 37 arranged as described above, each floor slab cable 37 is tensioned by the tensioning device (not shown) of the end portion struck floor slab block 39, and each floor slab cable 37 is placed. The end portion of the upper side floor slab is fixed to the end portion of the end-placed slab floor block 39 to construct an upper road slab portion (girder).

  Further, the main cable 40 is tension-fixed to the end portion place-placed slab block 39. In this case, when it is desired to reduce the horizontal force acting on the abutment 31 during the construction, as described later, the abutment is used as a form in which the lightened segment floor slab 23 is used and the post-cast concrete is filled. The horizontal force acting on 31 can be reduced, and in such a case, each of the floor slab cables 37 in the segment floor slab is secondarily tensioned again or the tension of the main cable 40 is adjusted. What should I do?

Next, as shown in FIG. 5, the floor slab carriage 1 is removed, and the temporary suspension cable 5 is removed. As described above, the end portion of the main cable 40 is tension-fixed to the end place cast-in-place block 39 separated from the abutment 31, the temporary suspension cable 5 is removed from the abutment 31, and the ground anchor 32 is counteracted. Since the force is released, the abutment 31 is a self-supporting suspended floor slab bridge that does not require any reaction force. More specifically, the floor slab block is composed of one or a plurality of segment floor slabs, and a large number of floor slab blocks are connected to the end of the bridge axial direction by a cable in the floor slab made of PC steel disposed in the floor slab block. The tension is fixed to the block (end portion slab floor slab block 39) to form a cable-encapsulated upper chord part, and each floor slab block is supported by a main cable via a support member, and the main cable is connected to the end part. It is said to be a self-contained upper-floor suspended floor slab bridge that has become firmly anchored in the block.
Next, the fixing part of the end part of the cable in the floor slab and the fixing part of the main cable 40 for main installation are protected, and the parapet 43 is integrally provided on the abutment. In addition, bridge works on a number of segment floor slabs 23 are constructed.

The main points of the above process are listed as follows.
(1) First, a winch 34 is temporarily installed between the abutments 31, and the temporary suspension cable 5 is stretched using the winch 34, and is tensioned and fixed to the abutment 31.
(2) A floor cart 1 is placed on a temporary suspension cable 5, and a segment floor slab 23 such as a precast plate or a steel shell is installed on the cart 1 with a crane or the like. Move to winch 34.
(3) The height of the segment floor slab 23 is adjusted by the height adjusting jack 22 provided in the floor slab carriage 1.
(4) The construction of the end cast-in-place block 39 constituting the end portion of the main girder including the segment floor slab 23 and the joints between the segment floor slabs 23 are filled with inflatable mortar and integrated.
(5) The support member 28 and the main cable (hanging cable, lower string cable) 40 are disposed.
(6) The floor slab cable 37 arranged in the girder constituted by the segment floor slab 23 and the edge cast-in block 39 is tension-fixed at the block 39 portion.
(7) Next, the main cable 40 is tensioned.

Further, in order to reduce the horizontal force acting on the abutment 31, a segment floor slab body 23a having a reduced weight as shown in FIG. 10 is used, and the segment floor slab body 23a is removed by the steps up to the above (7). After being supported by the suspended main cable 40, construction is performed by the following process.
(8) The post-cast concrete 46 is filled into the segment floor slab body 23a whose interior is lightened.
(9) The secondary tension of the cable in the floor slab 37 arranged in the girder constituted by the segment floor slab 23 and the end portion cast-in block 39 is performed, and the tension of the main cable 40 is adjusted.
(10) The floor slab carriage 1 and the temporary suspension cable 5 are removed.
(11) Perform protection work such as rust prevention of the cable 37 end of the floor slab cable 37 and the main cable 40 end, construct the parapet 43 on the abutment 31, and construct the bridge surface.

In the above-described embodiment of the present invention, a plurality of (three in the illustrated case) segment floor slabs on the floor slab carrier 1 are provided without providing the support members 28 on all the segment floor slabs 23 arranged in the bridge axis direction. Since one floor slab block is provided and the support material 28 is provided for the floor slab block, the sag (deflection) adjustment of the main suspension cable (main cable 40) can be set largely. The reaction force of the main suspension cable (main cable 40) can be set small.
On the other hand, when providing support materials for all the precast segments arranged in the direction of the bridge axis as in the past, it is necessary to set the sag adjustment of the main suspension cable (main cable) small. On the contrary, the reaction force of the main suspension cable (main cable) becomes large. Furthermore, when temporarily fixing steel materials are installed in the vertical and horizontal directions in the end block of the girder (suspended floor slab), it becomes difficult to place the main cable (cable in the slab) and the lower string cable (main cable) in the girder. Although there is a problem that the work at the site is complicated, in the present invention, it is not necessary to provide the temporarily fixed steel material as in the conventional case, and therefore the work at the site is not complicated.

  10 (a) and 10 (b) show a modified form of the segment slab 23 that can be used in the present invention. In the case shown in FIG. 10, the weight is reduced in order to reduce the horizontal force acting on the abutment 31 during construction. In FIG. 10A, the precast segment floor slab body 23 a having a cross-sectional groove shape is used. 10 (b), a steel shell segment floor slab provided with a T-shaped stiffening rib 47 extending in the direction of the bridge axis. A post-cast concrete 46 is placed in the main body 23a. 10A and 10B, the in-floor cable insertion hole 36 is formed by a sheath or the like.

  When using a segment floor slab body 23a reduced in weight as shown in FIG. 10, the segment floor slab body 23a is installed between the abutments 31 in the same manner as described above, and the main cable 40 is tension-fixed. After placing the post-cast concrete 46 in the floor slab body 23a, a bridge work may be constructed.

  When carrying out the present invention, the number of the main cables 40 and the number of the support members 28 may be appropriately used by a suspended floor bridge.

  In the illustrated embodiment, the case of a self-supporting upper-floor suspension floor slab bridge has been described. However, when the present invention is carried out, the present invention may be applied to a self-contained up-and-down type suspension floor slab bridge. In addition, it may be applied to an up-and-down type suspension floor slab bridge or an upper suspension floor slab bridge that bears the reaction force of the suspension cable on the abutment. In these cases, the segment floor slab is appropriately transported for floor slabs. What is necessary is just to make it support on a trolley | bogie, to be slid and to be mounted on the temporary suspension cable. In these cases, a temporary suspension cable that also serves as a permanent cable may be used as appropriate.

It is a schematic side view which shows the construction process of the suspended floor slab bridge of this invention, Comprising: The state which has constructed the construction suspension cable. The construction process of the suspended floor slab bridge of this invention is shown, Comprising: It is a schematic side view which shows the state which is transporting the segment floor slab with the carrying cart with the construction suspension cable. The construction process of the suspended floor slab bridge of the present invention is shown, and the floor slab carriage is arranged between the abutments, the height of the segment slab is adjusted, and the end place cast-in-place slab block is constructed. It is a schematic side view which shows the state which exists. It shows the construction process of the suspended floor slab bridge of the present invention, arranges the support material and the main cable, tensions and fixes the cable in the floor slab (cable in the girder), and tensions the main cable (suspended cable). It is a schematic side view which shows the state which exists. It shows the construction process of the suspended floor slab bridge of the present invention, removing the precast plate transportation carriage and temporary suspension cable, protecting the cable fixing part and constructing the parapet on the abutment, It is a schematic side view which shows the construction condition of a handrail. It is a longitudinal front view which shows the conveyance trolley for floor slabs in the middle of construction of the suspended floor slab bridge of this invention, and respond | corresponds to the longitudinal front view of FIG. It is a front view which shows the conveyance cart for floor slabs. FIG. 8 is a side view of FIG. 7. FIG. 6 is a longitudinal front view of a suspended floor slab bridge in a state in which a suspended floor slab and a support material are installed and a precast plate transport cart is removed, and corresponds to a longitudinal front view in which a part of FIG. 5 is omitted. It shows a case where a segment floor slab is formed by a combination of a lightened segment floor slab body and post-cast concrete, and (a) is a longitudinal front view showing a form of a precast segment floor slab body and post-cast concrete Fig. 2 (b) is a longitudinal front view showing a form of a steel shell segment floor slab body and post-cast concrete. It is a front view which expands and shows a part of FIG. It is explanatory drawing in the case of conveying and installing a segment floor slab one by one.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor slab carrier 2 Saddle support member 2a Upper flange 3 Saddle 4 Groove 5 Temporary suspension cable 6 Support member 6a Lower flange 7 Lower support frame 8 Gate frame 9 Leg 10 Vertical frame 11 Rotation handle 12 Female screw Member 13 Seat plate 14 Rotating handle 15 Female screw member 16 Height adjustment support member 17 Support member 18 Upper support member 19 Horizontal frame material 20 Clamp fitting 21 Jack support member 22 Jack for height adjustment 23 Segment floor slab (floor block)
23a Segment floor slab body 23b Joint part 24 Scaffold 25 Scissor 26 Handrail 27 Guard fence 28 Support 29 Suspension support 30 Suspension 31 Abutment 32 Ground anchor 33 Ground 34 Winch 35 Support line 36 Transverse through hole 37 Cable in floor slab 38 Bearing device 39 Cable in end location 40 Main cable (suspending cable)
41 Horizontal shaft 42 Mounting bracket 43 Parapet 44 Crane 45 Bundling bracket 45a Upper piece 46 Post-cast concrete 47 Stiffening rib 48 Main girder

Claims (3)

  In a suspended floor slab bridge, reaction force is applied to the temporary suspension cable, the floor slab block is adjusted in height with a jack, and the main cable is positioned below the floor slab block after the height is adjusted. And a supporting material, and a predetermined tension is applied to the main cable.   The floor slab carriage is supported by a temporary suspension cable, the floor slab block is supported by a jack on the floor slab carriage, and the height of the floor slab block is adjusted by the jack. And a main cable is disposed below the floor slab block, and a support member for connecting the floor slab block and the main cable is disposed, and then a predetermined tension is applied to the main cable. How to install a suspended floor bridge. A floor slab transport carriage used in the suspension floor slab bridge construction method according to claim 2, wherein a carriage main body having a temporary suspension cable support saddle, and a suspension scaffold supported by being suspended below the carriage main body, A floor slab carrier truck comprising a plurality of floor slab height adjusting jacks spaced apart in a bridge axis direction and a bridge axis perpendicular direction on an upper portion of the carriage main body.

Images