JP2019108725A - Coupling structure and coupling method of precast pc floor slabs - Google Patents

Abstract

To provide a coupling structure of precast PC floor slabs in which after prescribed arrangement of every predetermined number of precast PC floor slabs is completed, prestress introduction can be carried out without waiting for completion of the prescribed arrangement of the precast PC floor slabs to be installed successively.SOLUTION: There is provided a coupling structure of precast PC floor slabs in which a start end fixing floor slab 1c and a terminal end fixing floor slab 1d provided with fixing parts 2 of tensioning wires 6a, 6b on bottom surfaces are equipped at ends where a predetermined number of base floor slabs 1a are equipped in parallel in a bridge axial direction so that PC floor slabs 1a, 1b, 1c, 1d are integrated by PC pressure joining, the fixing parts 2 provided on the bottom surfaces of the start end fixing floor slab 1c and the terminal end fixing floor slab 1d are arranged at specified locations in a bridge axial orthogonal direction by being shifted such that the PC wires 6a, 6b of one division and another division adjacent thereto are equipped in a coupling part at intervals in the bridge axial orthogonal direction, and the tensioning wire 6a of the division and the tensioning wire 6b of the division overlap. The tensioning wires 6a and 6b can be regarded as being substantially consecutively equipped over the whole length of a girder.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection structure and a connection method of precast PC floor slabs installed in parallel in the axial direction of a steel girder bridge, and can be applied to replacement of PC floors of new bridges and existing bridges. It is a thing.

The precast PC floor plate 1 is arranged side by side in the bridge axis direction of the steel girder bridge, and prestress is introduced by inserting and tensioning the PC steel wire 6 into the precast PC floor plate 1 to integrate the precast PC floor plate 1 To do this is disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 7-119119) and the like, and is a known technique. (See Figure 6)
Further, the precast PC floor plate 1 is provided with the normal panel 1a, the connection panel 1b, and the fixing portion 2 of the PC steel wire on the bottom side so that the precast PC floor plate 1 connected by prestress can be efficiently repaired and replaced. Using the three types of fixing panel 1c, arrange the cap cable 65 between the fixing parts 2 of the fixing panel 1c, and connect the new and old precast PC floor by connecting the precast PC floor 1 by tension fixing. A repair method is disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 7-268808). (See Figure 7)

Japanese Patent Application Laid-Open No. 7-119119 Japanese Patent Application Laid-Open No. 7-268808

In the construction method of laying multiple precast PC floor slabs on steel girder of bridge and integrating these precast PC floor slabs by tension fixation of PC steel wire, it is necessary to connect continuous PC steel wire over the entire length of the bridge And, when the total length of the bridge is long, PC steel wire is connected to make it the required length.
Although it is suggested in Patent Document 1 that PC steel wires are connected using a connector to make the required length, in the method using a connector, laying of a precast PC floor slab is completed over the entire length of the bridge. Only after that can the tension fixing work of the PC steel wire be done. Therefore, the precast PC floor slab is temporarily installed only on the girder until integration of the precast PC floor slab by tension fixation of the PC steel wire is completed, and it is designed as a floor slab There is a problem that the construction period is prolonged because the strength is not exhibited and the pavement work can not be performed on the floor slab.

In Patent Document 2, without fixing the precast PC floor plate with PC steel wires across the entire length of the bridge, a fixing panel is provided in the middle of the bridge, and the precast PC floor plate is connected by a cap cable disposed between the fixing panels. It has been proposed to enable replacement and repair of precast PC floor slabs at arbitrary places.
However, since the precast PC floor slabs on both sides of the connection portion can not be connected unless they are tensioned and integrated first, the precast PC deck slabs of the entire bridge are tensioned and fixed as described for the technology disclosed in Patent Document 1. The precast PC floor version will not be integrated unless it is only after that, and paving work on the floor version can not be performed.

  The present invention implements prestressing by PC steel wires without waiting for the completion of installation of a precast PC floor slab installed subsequently to the completed installation of the precast PC floor slab after the installation of a predetermined number of precast PC floor slabs is completed. Can be paved on the floor slab for which introduction of prestress has been completed, and at the same time, the laying work of the precast PC floor slab, which will be installed subsequently during the paving work in that part, is carried out simultaneously The purpose is to shorten the construction period and reduce the construction cost by making it possible.

It is a connection structure that connects a predetermined number of precast PC floor slabs tensioned and fixed by PC steel wires in the bridge axis direction on the bridge girder, and the predetermined number of precast PC floor slabs are juxtaposed and adjacent to the end thereof There are a plurality of fixed sections of PC steel wire provided on the bottom of each of the start and end fixing floor slabs. In the connection section where the basic floor slab, the start-end fixing floor slab and the end-fixing floor slab are integrated by PC pressure bonding, the fixing part of the start-end fixing floor slab and the end fixing floor slab is PC steel wire in the direction perpendicular to the bridge axis The PC steel wire fixed to the end fixing floor slab and the PC steel wire fixed to the start fixing floor slab are lapped in a direction perpendicular to the bridge axis so as to be separated by a fixed distance. Connection structure of precast PC floor version characterized by certain It is.
In addition, a predetermined number of precast PC floor slabs are installed in parallel in the bridge axis direction on the bridge girder and connected by tension fixation of PC steel wire, and a predetermined number of basic floor slabs are laid in parallel, A start-up fixing floor slab provided with a fixing part at the bottom of the part is installed, and then a termination fixing floor slab provided with a fixing part is installed at the bottom of a predetermined number of basic floor slabs already installed. And a method of press-bonding the basic floor slab, the start-end fixing floor slab, and the end-fixing floor slab, so that the PC steel wires of the section and the adjacent section are arranged at a predetermined distance apart in the bridge axis orthogonal direction. A method of connecting precast PC deck slabs, which are provided mutually offset in the bridge axis orthogonal direction, and the PC steel wire of the section concerned and the PC steel wire of the adjacent section are wrapped.

The precast PC floor slabs are tensioned and fixed with PC steel wire in units of a predetermined number of sheets, and therefore the design strength as the precast PC floor slabs is in a state where the prestressed introduction is completed. It is possible to do other constructions such as paving work and column construction in the section, and it is necessary to make other constructions such as paving work wait until the laying of precast PC floor slab over the full length of the bridge and tension fixation are completed as before. Instead, the construction period for the entire construction can be significantly shortened.
By parallel installation of a predetermined number of precast PC floor slabs and adjusting their tension and fixation to the extent completed in one day work, the precast PC floor slabs completed in the work on the day are integrated into a floor slab It is a state where design strength is exhibited, and it is possible to shorten the unstable temporary installation state where only precast PC floor slabs are placed on the girder, and natural disasters such as earthquakes and storms during construction. Even if it strikes, since the precast PC floor plate can exhibit predetermined design strength, it is possible to reduce the incidence of chipping, breakage, falling and the like.
In addition, by interposing a connecting floor plate between the start and end fixing floor plates, the lap length of the PC steel wire at the connecting portion can be made sufficient and stress at the connecting portion of the floor plate Transmission is smoothly performed, and a strong connection structure can be obtained.

The top view and sectional drawing of the connection part of a precast PC floor slab. The perspective view of a precast PC floor plate. The detailed sectional view of a crimp joint. The detailed sectional view of a slip prevention hole, and the detailed sectional view of a level adjustment hole. Process chart of precast PC floor plate construction. The perspective view of prior art which carries out tension fixation of a precast PC floor slab. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a prior art cross-sectional view of precast PC deck connection using a cap cable.

It demonstrates based on the top view of the connection part of the precast PC floor slab of FIG. 1, the sectional view of the width direction connection part, and the Example shown to the perspective view of FIG.
The precast PC floor plate 1 of the illustrated embodiment is of three types, a basic floor plate 1a, a connecting floor plate 1b and a fixing floor plate (starting end fixing floor 1c and ending fixing floor 1d), all of which are orthogonal to the bridge axis This is a one-plate version in which no joint is provided in the (X-X direction). A plurality of PC steel wires are arranged in the direction orthogonal to the bridge axis to make a two-way PC floor slab prestressed to the floor slab by a pretension method.
If the width is large, or there is a transportation limitation and the length of the precast PC floor slab in the direction orthogonal to the bridge axis is restricted, the precast PC floor slab can be manufactured at the factory also in the bridge axis orthogonal direction (X-X direction) A precast PC floor slab of the required size can be produced by dividing, manufacturing in situ, joining by post tension method, and integrating.

  It is preferable in terms of cost to manufacture the basic floor slab 1a, the connected floor slab 1b, and the fixed floor slabs 1c, 1d with the same width (the length in the bridge axial direction). A plurality of fixing portions 2 are formed so as to protrude from the bottom so that a plurality of PC steel wires can be tensioned and fixed, respectively, and the fixing portion 2 is a start-end fixing floor plate. Since the projecting directions of the fixing portion 2 are opposite to each other depending on whether it is an end fixing floor plate and are provided at mutually offset positions in a direction perpendicular to the bridge axis, substantially the start fixing floor plate and the end fixing floor are Since the plate can be used in reverse, it is easy to install and economical.

In order to consider the restriction of the plate width at the time of precast formwork use and transportation, the connecting floor plate 1b is sandwiched between the start fixing floor plate 1c and the end fixing floor plate 1d to form a connecting portion, and PC steel for tensioning. The basic form is to secure the wrap length of the lines 6a and 6b. Since the connection floor slab 1b is used to wrap the PC steel wires 6a and 6b at regular intervals in the bridge axial direction, two sheaths for passing the PC steel wires are provided.
In addition, it is not essential to install the connection floor slab 1b, and the width (length in the bridge axis direction) of the start-end fixing floor slab 1c and the end-fixing floor slab 1d is increased to wrap sufficient tension PC steel wire 6a, 6b The connected floor slab 1b can be omitted so as to secure the length. Moreover, in order to make the lap | wrap length of PC steel wire 6a, 6b in a connection part into predetermined length, the connection floor slab 1b is not restricted to one piece, It is good also as installing multiple sheets.

In the connecting portion, the fixing portions 2 of the start fixing floor slab 1c and the end fixing floor slab 1d are bridge shafts so that the tension steel wires 6a and 6b are disposed parallel to each other with a predetermined interval in the orthogonal direction of the bridge axis. They are provided at mutually offset positions in the perpendicular direction.
The PC steel wire 6a, 6b is so long that the tension steel wire can be regarded as a substantially continuous PC steel wire by arranging the PC steel wires 6a, 6b in a lapping arrangement at the connecting portion. Determined. The separation distance of the PC steel wires 6a and 6b in this lap section is equal to or more than the minimum distance of the PC steel wires defined in the road bridge specification.

The juxtaposed precast PC floor plate 1 is crimped and bonded by the tension introduced to the PC tensile steel wires 6a and 6b. The pressure-bonded surface can be selected from two types, a dry method and a wet method as shown in FIG.
In the dry method, it is preferable to apply the adhesive 6A between the precast PC floor slabs 1 and 1 and provide a gap of about 2 to 5 mm in consideration of the manufacturing error of the precast PC floor slab 1. A sponge rubber 61 is attached so that rain water and an adhesive do not flow into the inside of the sheath 60 from the joint portion of the sheath 60.
In the wet method, a joint 20 of 10 to 20 mm is provided between the precast PC floor slabs 1 and 1 and the non-shrink mortar 71 is filled in the joint 7. The sponge rubber 61 is attached to the joint of the sheath so as not to flow into the joint 7 and filled with the non-shrink mortar 71 to fill the joint 7.
By introducing prestress in the direction perpendicular to the bridge axis, when warpage or plane bending deformation of the precast PC floor plate 1 becomes large, a wet method can be adopted to cope with the situation.

  FIG. 4A is a detailed cross-sectional view of the slip preventing hole 12 provided in the precast PC floor slab 1. A sole rubber 4 is placed between the upper surfaces of the precast PC floor plate 1 and the flange 31 of the steel girder 3 so as to absorb the installation error of the precast PC floor plate 1 to provide a clearance, and the precast PC floor plate 1 is made of steel girder 3 After installing on the flange 31, fill the gap non-shrink mortar 71, fill the slippage prevention hole 12 with expanded concrete 14, and join the precast PC floor plate 1 and the steel girder 3 via the stud bolt 32. Integrate to prevent slippage. Instead of the non-shrink mortar 71, an expansion mortar can also be used.

  FIG. 4 (2) is a detailed cross-sectional view of the level adjustment hole 13 for adjusting the level of the precast PC floor slab 1, in which the insert 8 for level adjustment with an internal screw is driven in and installed in the precast PC floor slab 1 The level adjustment hole 13 is provided at the top of the insert 8. When installing the precast PC floor slab 1 on a steel girder, place the sole rubber 4 between the precast PC floor slab 1 and the upper surface of the flange 31 of the steel girder 3 so that a gap is formed. Install. After installation, the level adjustment bolt 50 is screwed into the insert 8 from the hole 13, and the level of the precast PC floor plate 1 is adjusted by the adjustment bolt 50. After adjustment, the non-shrink mortar 71 is filled in the clearance and the level adjustment hole 13 to maintain the level condition of the precast PC floor slab.

FIG. 5 shows an example of the construction procedure of the precast PC floor slab having the connection structure of the present invention, in which the total length L of the steel girder bridge is divided into three sections of section A, section B and section C. It is a construction process figure at the time of providing a connection part in two places.
Step (1) A predetermined number of basic floor slabs 1a are juxtaposed, and in contact with the basic floor slab 1a at the end of the section A, the start end fixing floor slab 1c of the section B, then the connected floor slab 1b, the end of the section A Fixing floor plate 1d is disposed, and PC steel wire 6a is inserted from the side end face of basic floor plate 1a at the end to the final fixing floor plate 1d located at the end of section A, and the final fixing floor plate 1d of section A is fixed The precast PC floor slab of section A is integrated including the leading end fixing floor slab 1c of section B by tension fixing on the side end faces of the fixing section 2 and the basic floor slab 1a.
Step (2) Subsequently, in section B, a predetermined number of basic floors 1a are installed following the end fixing floor 1d of section A, and then, the start fixing floor 1c, section 1b and section B of section C are continuously installed. The final fixing floor plate 1d is installed, and the PC steel wire 6b is inserted from the fixing portion 2 of the leading end fixing floor plate 1c of section B to the fixing portion 2 of the final fixing floor plate 1d of section B and tensioned and fixed to the fixing portions. , And the entire section B is integrated including the section C start end fixing floor plate 1c.
Step (3) The final section C is constructed in the same procedure as described above to complete the whole. The floor slab at the final position of section C is the basic floor slab 1a, and the PC steel wire 6c is fixed to the side end face of the basic floor slab 1a.

In the case where a dry joint construction method is adopted after laying the precast PC floor plate of each section, the tension work of the PC steel wire 6 (6a, 6b or 6c) can be performed immediately. If a wet joint construction method is adopted, tension work of PC steel wire will be performed after joint mortar reaches a predetermined strength. For example, if Seramax (trade name) of non-shrink mortar is used, the necessary strength is exhibited the next day, so perform tension work of PC steel wire 6 the day after the completion of laying of the precast PC floor plate Can.
Thus, the precast PC floor slabs 1 installed side by side are integrated by tension fixing the PC steel wire 6 (6a, 6b or 6c) in each section. And during construction work to unify by installation and tension fixation of precast PC floor slab of the next section, paving work and balustrade installation construction etc can be carried out simultaneously in parallel on the upper surface of the section where integration is completed. , The entire construction period can be significantly shortened.

  By setting the length of one section to the length of completion of the installation by precast PC floor plate 1 and integration by tension fixation in one day, the tension of the precast PC floor plate 1 installed on the day is fixed and integrated within that day As the design strength of the floor slab can be realized and the design strength of the floor slab is exhibited, temporary support work and metal fittings etc. during installation work of the precast PC floor slab 1 become unnecessary, and labor saving of construction and Cost reduction can be achieved.

  Change the installation order of the precast PC floor plate 1 shown in the construction drawing of Fig. 5 and start the installation of the precast PC floor plate from the central section, and then proceed to both directions of the central section where the installation is completed If 1 is installed, the installation work of the precast PC floor plate 1 of the two sections on both sides of the section can be simultaneously advanced, so that the construction period can be further shortened.

1 Precast PC floor slab 1a Basic floor slab 1b Connecting floor slab 1c Start-end fixing floor version 1d End-fixing floor version 12 Slip stop hole 13 Level adjustment hole 14 Expansion concrete 2 Fixing section (protrusion)
3 Steel girder 31 Flange 4 Sole rubber 32 Stud bolt 50 Level adjustment bolt 6 (6a, 6b, 6c) PC steel wire 6A Adhesive 65 Cap cable 60 Sheath 61 Sponge rubber 7 Joint 71 Non-shrink mortar 8 Insert

It is a connecting structure that connects a predetermined number of precast PC floor slabs tensioned and fixed by PC steel wires in the direction of the bridge axis on the bridge girder, and a PC at the bottom with a predetermined number of basic floor slabs juxtaposed There is a connection structure in which a starting end fixing floor slab having a steel wire fixing portion and an end fixing floor slab are installed, and a predetermined number of basic floor slabs, the starting end fixing floor slab and the end fixing floor slab are integrated by PC pressure bonding. The fixing sections of the fixing floor plate and the end fixing floor plate are mutually offset by a predetermined distance in the bridge axis orthogonal direction, and the PC steel wire is disposed by being shifted by the predetermined distance in the bridge axis orthogonal direction at the offset section. It is a connection structure of a precast PC floor slab in a state where a PC steel wire fixed to a plate and a PC steel wire fixed to a start fixing floor plate are wrapped.
In addition, a predetermined number of precast PC floor slabs are installed in parallel in the bridge axis direction on the bridge girder and connected by tension fixation of PC steel wire, and a predetermined number of basic floor slabs are laid in parallel, A start-up fixing floor slab provided with a fixing part at the bottom of the part is installed, and then a termination fixing floor slab provided with a fixing part is installed at the bottom of a predetermined number of basic floor slabs already installed. And a fixing section provided at the bottom of the start fixing floor plate and the end fixing floor plate is a PC steel wire in the direction perpendicular to the bridge axis. The fixing sections of the start and end fixing floor slabs are arranged to be shifted in the direction perpendicular to the bridge axis such that the PC steel wires are arranged at predetermined distances from each other. Pre-cast P to shift PC steel wire by displacing to each other by a predetermined distance It is a method of connecting the deck.

The fixing portions 2 of the start fixing floor slab 1c and the end fixing floor slab 1d are bridge shafts so that the PC steel wires 6a and 6b are arranged in parallel at predetermined intervals in the bridge axis orthogonal direction and lapped in the connecting portion. The PC steel wires 6a and 6c are disposed at mutually offset positions in the perpendicular direction, and are disposed offset from the arrangement direction of the PC steel wires in the basic floor slab at the offset portion 6z.
The PC steel wire 6a, 6b wraps so that the PC steel wire can be regarded as a substantially continuous PC steel wire by arranging the PC steel wires 6a, 6b in a lapping arrangement at the connecting portion. Determined. The separation distance of the PC steel wires 6a and 6b in this lap section is equal to or more than the minimum distance of the PC steel wires defined in the road bridge specification.

1 Precast PC floor slab 1a Basic floor slab 1b Connecting floor slab 1c Start-end fixing floor version 1d End-fixing floor version 12 Slip stop hole 13 Level adjustment hole 14 Expansion concrete 2 Fixing section (protrusion)
3 steel girder 31 flange 4 sole rubber 32 stud bolt 50 level adjustment bolt 6 (6a, 6b, 6c) PC steel wire 6A adhesive 6z offset portion 65 cap cable 60 sheath 61 sponge rubber 7 joint 71 non-shrink mortar 8 insert

Claims (5)

It is a connection structure that connects a predetermined number of precast PC floor slabs tensioned and fixed by PC steel wires in the bridge axis direction on the bridge girder, and the predetermined number of precast PC floor slabs are juxtaposed and adjacent to the end thereof There are a plurality of fixed sections of PC steel wire provided on the bottom of each of the start and end fixing floor slabs. In the connection section where the basic floor slab, the start-end fixing floor slab and the end-fixing floor slab are integrated by PC pressure bonding, the fixing part of the start-end fixing floor slab and the end fixing floor slab is PC steel wire in the direction perpendicular to the bridge axis The PC steel wire fixed to the end fixing floor slab and the PC steel wire fixed to the start fixing floor slab are lapped in a direction perpendicular to the bridge axis so as to be separated by a fixed distance. Connection structure of precast PC floor version characterized by certain . The connection floor plate for adjusting the lap length of the PC steel wire is provided between the end fixing floor plate and the start-up fixing floor plate according to claim 1, and the connection floor plate is made to wrap the PC steel wire. A connection structure of precast PC floor slabs, wherein sheaths of the above are provided at predetermined intervals. A connecting method in which a predetermined number of precast PC floor slabs are installed in parallel in the bridge axial direction on a bridge girder and connected by tension fixation of PC steel wire, and a predetermined number of basic floor slabs are laid in parallel, A start-up fixing floor slab provided with a fixing portion at the bottom is installed, and then a termination fixing floor slab provided with a fixing portion is installed at the bottom of a predetermined number of basic floor slabs already installed. A method of press-bonding a basic floor slab, a start-end fixing floor slab, and an end-fixing floor slab, wherein the PC steel wire of the section and the adjacent section is disposed at a predetermined distance apart in the bridge axis orthogonal direction. A method of connecting precast PC deck slabs, which are provided mutually offset in the orthogonal direction, and the PC steel wire of the section concerned and the PC steel wire of the adjacent section are wrapped. After parallel installation and tension fixation of the precast PC floor slab are completed in claim 3, parallel installation of the precast PC deck slab of the adjacent area in parallel with performing paving work on the floor slab part which completed tension fixation. And a method of connecting precast PC floor plates characterized by carrying out tension fixation. The method of connecting precast PC decks according to claim 3 or 4, wherein the number of precast PC decks to be laid is the number that can complete the tension fixing work within the construction day.