JP5062418B2 - Plane frame structure with precast concrete girder - Google Patents

Description

  The present invention mainly uses underpass, bridge floor slabs and other lithographic materials for constructing passages such as roads and rivers crossing the ground for roads and railways, underpass retaining walls, bridge piers / abutments, Alternatively, the present invention relates to a lithographic frame structure made of precast concrete girders constructed by spanning a plurality of precast concrete girders between support structures such as houses.

  Conventionally, as a method of laying flat plates such as bridge slabs, precast concrete girders are arranged in the width direction, each end is erected on a pier or abutment, and joint concrete is placed between each precast concrete girder. In addition, a method of constructing a slab-like floor slab is known by integrating each girder in the width direction with a connecting material such as a steel rod inserted across the width direction (for example, Patent Document 1). ).

  In addition, as an underpass for constructing a road such as a road or a river crossing the ground mainly for a road or a railway, there is a so-called box culvert. In this, there are some concrete concrete blocks in the form of square tubes produced by factory production or divided concrete blocks that are divided into multiple pieces, and are embedded in an arrangement across the ground. If there is a limit on the size and the top plate width exceeds a certain level, cast-in-place concrete, top plate, and bottom plate must be formed, and prior to the construction of the main body In order to form a working space larger than the box culvert housing, it is necessary to perform temporary earth retaining, which causes a problem that the construction period becomes long.

  In order to solve this problem, a structure in which a pair of side walls is constructed and a top plate is stretched over the upper ends of the side walls is known. In addition to a method of constructing the side wall by cast-in-place concrete, there is a method of constructing a side wall by standing a large number of concrete piles. The top plate is constructed with cast-in-place concrete, and a number of precast concrete girders are laid side by side, and when concrete is placed in the gap between the girders, the tension of the PC tension material penetrated in the width direction of the girders There is a method to integrate the precast concrete girders.

  As shown in FIG. 12, this type of conventional underpass top plate such as a top plate is constructed in a stepped manner on the upper ends of support structures 1 and 1 such as side walls constructed by the various methods described above. Form top plate support portions 2 and 2, place both ends of top plate 3 on the support portions 2 and 2, and integrate both ends of top plate 3 and support portions 2 and 2 with a fastener such as a bolt. (For example, Patent Document 2).

Also,
JP 2005-281969 A Japanese Patent No. 3896351

  The conventional planographic frame structure described above has a top plate support part formed in a step-like arrangement at the upper end of a support structure such as a retaining wall side wall, and is supported by the top plate support part by cast-in-place concrete. Because the top plate is formed, the construction period is long, and because it is due to concrete molding at the site, it is difficult to make the top plate concrete where the live load constantly acts high strength and high quality. There is a problem that there is. Further, in the case of underpass, there is a problem that the traffic regulation period becomes longer as the construction period becomes longer.

  Moreover, as a method of solving such a problem, a method of manufacturing a precast concrete girder as in Patent Document 1 in a factory, carrying it in the field and installing it, is considered, and the span between the support portions is large. The use of prestressed concrete (hereinafter referred to as PC) girders can be considered, but even when using precast concrete girders, in order to reduce the maintenance of the support and to make a rigid structure that can block the groundwater of the back soil, There was a problem that a lot of on-site work was necessary, such as tension fixing and grout work of reinforced joints, PC steel materials, filling of mortar, and concrete placement.

  In view of such a conventional problem, the present invention uses a precast concrete product that can be manufactured at a factory with high quality as a flat plate such as an underpass top plate, a bridge or a floor slab of a building, The connecting and fixing work with the supporting structure in the work is performed in a short time with a small number of man-hours, and the connecting portion between the supporting structure and the lithographic material has a rigid joint structure with the required strength without being affected by the superiority or inferiority of the field work. It was made for the purpose of providing a planographic structure with precast concrete girders that can be used.

  In order to solve the above-mentioned conventional problems and achieve the intended object, the feature of the invention described in claim 1 is that a plurality of precast concrete girders are arranged between support structures standing upright apart from each other. In a lithographic frame structure using a precast concrete girder that is supported in a parallel arrangement and integrated between the precast concrete girders, a number of sockets open upward at the upper end of the support structure Are arranged in the horizontal length direction of the support structure, and are provided integrally with each other, and a downward socket insertion protrusion that can be inserted by providing a gap between the inner surface of each of the precast concrete girders and the inner surface of each of the precast concrete girders. The socket insertion convex portion is inserted into each socket on the support structure portion, and the gap between the socket and the socket insertion convex portion is filled. In that is integrated with each other by filling the timber.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the lithographic material is a top plate constituting an underpass, and the support structure is a retaining wall constituting the underpass. It is to be.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the lithographic material is a bridge floor slab, and the support structure is a pier or abutment that supports the floor slab. There is.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the support structure is a precast concrete pile that is placed side by side in the ground. The sockets are integrally provided at the upper ends of the two.

  The feature of the invention described in claim 5 is that, in addition to the structure of claim 4, the socket is a steel tubular member installed at the upper end of the precast concrete pile.

  The feature of the invention described in claim 6 is that, in addition to the configuration of any one of claims 4 or 3, the precast concrete pile is a precast concrete pile having an H-shaped cross section.

  According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the web portion at the upper end of the H-shaped precast concrete pile is removed by the depth of the socket, and the web portion is removed. By fixing a steel side plate between the front and rear flange edges of the portion, a socket surrounded by the front and rear flange portions and both side plates is integrally provided at the upper end of the pile.

  According to an eighth aspect of the present invention, in addition to the configuration of the sixth aspect of the invention, the web portion at the upper end portion of the precast concrete pile having an H-shaped section and one flange portion are provided by the depth of the socket. The two flanges of the other flange portion are integrated with both edges of the steel bracket having a U-shaped cross section, and the other flange portion and the U-shaped flange are integrated into the web portion and one flange portion removal portion. A socket surrounded by steel fittings is integrated with the top of the pile.

  The feature of the invention described in claim 9 is that, in addition to the configuration of claim 6 of claim 6, a steel socket front side plate and socket back side plate are provided on the outer surface of both flanges at the upper end of the H-shaped precast concrete pile. A plurality of the precast concrete piles adjacent to each other are installed and connected together by connecting the socket front plate and the socket back plate, and connecting the front plate and the back plate with a partition connecting member. It is in forming a socket.

  A feature of the invention described in claim 10 is that, in addition to the structure of any one of claims 1 to 9, the precast concrete girders are used as a fastener to integrate the precast concrete girders. In other words, the PC tension material inserted in the width direction is used, and prestress in the width direction is introduced to the entire lithographic material.

  The present invention configured as described above has the following effects.

  The lithographic part is composed of a large number of precast concrete girdles arranged in parallel, and the gaps between the girders are filled with joint material, and the gaps between the girders are integrated into a lithographic shape with a fastener in the width direction. Thus, each precast concrete girder can be manufactured with a constant quality at the factory, and it becomes easy to make the top plate having a large influence of the live load with high strength and high quality.

  A large number of sockets opened upward are integrally provided at the upper end of the support structure, and can be inserted into the socket with gaps between the inner surfaces of the precast concrete girders constituting the top slab. A downward socket insertion convex portion is integrally provided, the socket insertion convex portion is inserted into each socket on the support structure portion, and a filler is filled in the gap between the socket and the socket insertion convex portion. By integrating each other, the precast concrete girder erection work is done by fitting the socket for the precast concrete girder into the socket of the pre-formed support structure, and using a non-shrinkable mortar or the like in the gap between them. Since the work is completed simply by filling the filler, the work at the site becomes a simple work that does not require skill, and the work man-hours are small and the work period can be shortened. .

  Even if there is a manufacturing error of the projection for inserting the socket of the precast concrete girder in the socket of the support structure, it is possible to fix the gap between the two without any problem by setting the gap between the two fitting parts. can do.

  The support structure is composed of precast concrete piles arranged side by side in the ground, and the sockets are integrally formed at the upper end of each precast concrete pile, so that sockets are formed during the production of precast concrete piles. This reduces the amount of work on site and stabilizes the quality of the socket.

  By making the said socket into the cylindrical member made from steel installed in the upper end of a pile, it can be set as the structure which has a high bending and shear stress as a joint part becomes the steel concrete composite structure by which the outer periphery was coat | covered with the steel pipe.

  By setting the precast concrete pile as a precast concrete pile having an H-shaped cross section, when constructing the retaining wall, the compacted concrete is placed in a space formed between the flange portions of adjacent H-shaped precast concrete piles. It becomes possible, and it can be set as the structure which was excellent in the water stop while improving the transmissibility of the stress between piles.

  By removing the web portion of the upper end portion of the precast concrete pile having an H-shaped section by the depth of the socket, and fixing the steel side plate between the front and rear flange edge portions of the web portion removal portion, By providing a socket surrounded by the front and rear flanges and both side plates integrally on the top of the pile, most of the members that make up the socket are made up of precast concrete pile components, which is economical and precast concrete. The unity between the pile and the socket is increased, and a stable strength can be obtained.

  The web part at the upper end of the H-shaped precast concrete pile and one flange part are removed by the depth of the socket, and a steel fitting having a U-shaped cross section is formed at both edges of the other flange part. Both edges are integrated, and a socket surrounded by the other flange part and the U-shaped steel fitting is integrally provided at the upper end of the pile at the web part and one flange part removal part to constitute a socket. A part of the member to be made is constituted by the precast concrete pile constituent portion, which is economical and the unity between the precast concrete pile and the socket becomes high, and a stable strength can be obtained.

  A steel socket front side plate and a socket rear side plate are installed on the outer surface of both flanges at the upper end of the H-shaped precast concrete pile, and between the socket front plate and the socket back plate of the precast concrete pile adjacent to each other. By connecting together and forming a plurality of sockets by connecting the front plate and the back plate with a connecting member for partitioning, the width of the H-type precast concrete pile and the precast concrete girder is reduced. If there is a difference in the width of the crane that can be used and road transportation problems, a socket with a width corresponding to the width of the precast concrete girder can be easily installed on the support structure in which precast concrete piles are arranged side by side. Can do.

  As a fastener for integrating the spaces between the precast concrete girders, using a PC tension material that is inserted in the width direction across the precast concrete girders, and introducing a prestress in the width direction to the entire lithographic material. Thus, the live load applied to one precast concrete girder is distributed to other precast concrete girders, and the load per girder can be reduced.

  Next, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 shows an embodiment in which the present invention is applied to an underpass. In the figure, reference numeral 10 denotes a ground such as a road where an underpass is provided, and 11 is a support structure according to the present invention, which crosses the ground 10. A pair of retaining wall 12 formed in the arrangement is a lithographic material in the present invention, and is a top plate that is stretched between the tops of both retaining walls 11 and is integrally connected. This is a bottom plate that is formed automatically.

  As shown in FIG. 2, the earth retaining wall 11 is configured by placing a large number of precast PC piles 14, 14... Having an H-shaped section in the width direction and placing them in the soil. That is, the earth retaining wall 11 is configured by setting a precast PC pile 14 having an H-shaped cross section in the ground 10 by connecting the H-shaped flange portions 14b and 14c. In addition, this sinking can be carried out while inserting an auger screw type drilling machine (not shown) between the flange portions 14b, 14c and discharging the soil with this drilling machine.

  The lower end side of the precast PC pile 14 is set in the ground at the bottom of the ground, and the upper side from the bottom slab 13 constitutes an underpass retaining wall. The formation of the retaining wall 11, 11 forms the retaining wall 11, 11 having a predetermined depth by sinking the piles 14, 14... From the ground 10 into the soil, and then the piles 14, 14 facing each other. A cut beam is temporarily provided between them, and the earth and sand between the two retaining wall walls 11 and 11 are excavated to form a desired underpass space 15.

  After the underpass space 15 is formed, the bottom plate 13 is formed by cast-in-place concrete. In forming the bottom plate, for example, a bottom plate connecting reinforcing bar previously set in the precast PC pile 14 constituting the retaining wall is embedded in the bottom plate 13 to be integrated with the retaining wall.

  Further, in each retaining wall 11, 11, a PC tension member 17 is inserted for each predetermined width of the retaining wall and a space 18 surrounded by the flange portions 14 b and 14 c and the web portion 14 a of the precast PC piles 14 and 14 adjacent to each other. The interstitial concrete 19 is placed therein, and the PC tension members 17 are tensioned to fill the spaces between the piles, thereby forming a soil retaining side wall integrated with each other.

  Each precast PC pile 14 is integrally provided with a steel socket 20 at the upper end thereof. As shown in FIG. 3, the socket 20 is formed in a square tube shape, and substantially half of the lower end side is fitted outside the upper end of the precast PC pile 14, and the remaining upper end side portion extends in the upper end extending direction of the pile 14. It protrudes.

  As shown in FIG. 6, sockets 20 corresponding to the number of piles 14 are formed at the upper ends of the respective retaining wall side walls 11, 11 by forming the retaining wall side walls 11, 11 by laying the precast PC piles 14 side by side. Installed side by side in the horizontal direction of the retaining ring.

  As shown in FIGS. 4 to 8, the top plate 12 has a number of precast PC girders 25 arranged in the axial direction of the underpass, and both ends are spanned between the upper ends of the earth retaining walls 11, 11, and the precast PC girders adjacent to each other. The mortar 33 which is a filling material and joint material which will be described later is interposed in the gap between 25 and 25, and is formed in a lithographic shape. Further, PC tension members 35, 35, which will be described later, are inserted across the width direction of the precast PC girders 25, 25... The whole is integrated by introducing prestress in the width direction, that is, the tunnel direction of the underpass.

  4 to 6 show the state before filling the mortar 33 which is the filling material and the joint material, and FIGS. 7 and 8 show the state after the filling.

  Each precast PC girder 25 is formed at a factory, and prestress is introduced in the length direction thereof. On both lower surfaces of both ends of the precast PC girder 25, socket fitting convex portions 25a and 25a each having a size that fits in the socket 20 with a gap are integrally formed. On both side surfaces, filling material filling recesses 30 reaching from the upper edge to the vicinity of the lower edge are formed at regular intervals at symmetrical positions, and shallow joint recesses 31 are formed at both ends on the upper edge. Is formed. Further, each precast PC girder 25 is formed with a PC tension material insertion hole 32 opened to communicate with the filling material filling recesses 30 on both side surfaces.

  The top plate 12 is constructed by bringing the precast PC girder 25 into the construction site, and socket fitting projections 25a and 25a at both ends of the precast PC girder 25 to the sockets 20 and 20 at the upper end of the retaining wall 11 and 11 constructed previously. , A large number of precast PC girders 25, 25,.

  After that, the PC tension material is inserted between the adjacent precast PC girders 25 and 25 into the space between the adjacent precast PC girders 25 and 25 into the space between the precast PC girders 25 and 25. A sheath (not shown) is installed across the holes 32, 32, and the mortar 33, which is a filler, is filled in the space for filling. At the same time, a mortar 33 as a joint material is filled in the joint groove formed by the joint recesses 31, 31.

  In this way, a large number of precast PC girders 25 are arranged side by side to form a planographic shape, and then the PC tendon 35 is inserted into the PC tendon inserts 32, 32. By applying prestress in the width direction to the entire top plate 12, the top plate 12 is obtained by mechanically integrating the precast PC girders 25. Next, the gap between the inner surface of the socket 20 and the outer peripheral surface of the convex portion 25a is filled with a filler 36 made of non-shrink mortar.

  In the above-described embodiment, the socket 20 is configured by integrally projecting a metal fitting having a cylindrical shape at the upper end of the precast PC pile 14 having an H-shaped cross section. As shown in (c), the web portion 14a at the upper end of the H-shaped precast PC pile 14 is removed by the depth of the socket, and the edges of the flange portions 14b and 14c before and after the removed portion of the web By fixing the steel side plates 50, 50 between the parts, the socket 51 surrounded by the front and rear flange portions 14b, 14c and the side plates 50, 50 can be integrally provided at the upper end of the pile.

  By constituting in this way, most of the members constituting the socket will be constituted by the precast PC pile component, which is economical and the integrity of the precast PC pile and the socket is increased, and the stable strength is increased. can get.

  In addition, as shown in FIGS. 12 (a) to 12 (c), the web portion 14a at the upper end of the H-shaped precast PC pile 14 and the one flange portion 14b are provided by the depth of the socket. Then, both edges of the steel fitting 52 having a U-shaped cross section are integrated with both edges of the other flange part 14c, and the other flange part 14c and the above-mentioned flange are connected to the web part and one flange part removal part. A socket 53 surrounded by a letter-shaped steel fitting 52 can be integrally provided at the upper end of the pile.

  By constituting in this way, a part of the member constituting the socket will be constituted by the precast PC pile constituent part, and it is economical and the integrity of the precast PC pile and the socket becomes high and stable. Strength is obtained.

  Further, as shown in FIGS. 13A to 13C, a socket front side plate 54a and a socket in which a steel plate is formed on the outer surface of both flange portions 14b and 14c at the upper end of the H-shaped precast PC pile 14 as shown in FIGS. The back side plate 54b is installed, and the temporary fixing plates 55 and 55 are temporarily fixed by bolts between both edges of the both plates 54a and 54b.

  After the precast PC piles 14, 14... Are placed side by side to form a supporting structure, the temporary fixing plates 55, 55... Are removed as shown in FIG. , 14 between the socket front plates 54a, 54a and between the socket rear plates 54b, 54b are connected by connecting means such as welding or bolting.

  After that, a plurality of partition connection plates 56, 56,... Are connected by welding or screwing at regular intervals between the socket front plate 54a and the socket back plate 54b connected to each other. In this manner, an arbitrary number of sockets 57 surrounded by the socket front plate 54a, the socket back plate 54b, and the pair of partition connection plates 56, 56 can be formed.

  By configuring the socket 57 in this way, if the width of the H-shaped precast PC pile 14 and the precast PC girder 25 is different depending on the width of the crane that can be used and road transportation problems, the precast PC pile A socket having a width corresponding to the width of the precast concrete girder can be easily installed on the support structure arranged side by side.

  In addition, although the above-mentioned Example has shown the case where the retaining wall is constructed using the H type precast PC pile, various precast concrete piles for constructing the continuous underground wall in addition to the H type The retaining wall may be constructed using steel pipe piles and cast-in-place concrete piles.

  In addition to the steel tubular member described above, the socket at the upper end of the retaining wall is a socket 20 formed by integrally molding a recess 40 at the upper end of the retaining wall 11 as shown in FIGS. May be. In addition, the same code | symbol is attached | subjected to the same part as the Example mentioned above.

  In addition to the precast concrete piles, the retaining wall is constructed by installing vertical (vertical) wall-shaped concrete blocks that are molded integrally with the bottom plate or integrated with the bottom plate, or by cast-in-place concrete. May be. In these cases, the upper end socket may be installed by embedding a steel pipe, and the peripheral wall may be a concave portion made of concrete.

  Further, the present invention may be applied to a bridge as shown in FIG. 15 in addition to the above-described underpass top plate frame structure. In this example, on the opposite bank of the river, an abutment (or pier) as a support structure is provided. ) 45, 45 is constructed, and the floor slab 46, which is a lithographic material, is installed between the upper ends of the abutments (or piers) 45, 45 in a rigid connection structure. In this case, the abutment (or pier) 45 may have various structures such as those using a concrete PC pile similar to that described above, and those made of cast-in-place concrete.

  Further, although not shown in the drawings, the present invention can be similarly applied to the connection of an appropriate building wall and floor.

It is sectional drawing which shows an example of the underpass which implemented this invention. It is a cross-sectional view which shows the earth retaining side wall same as the above. The socket part of the H type precast PC pile which comprises the earth retaining side wall same as the above is shown, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view. FIG. 2 is a partially longitudinal front view showing a precast PC girder construction state constituting the top plate of the embodiment shown in FIG. 1. It is the same top view. It is the sectional view on the AA line in FIG. It is sectional drawing which shows the state after filling of the filling material and joint material of the BB line position in FIG. It is sectional drawing which shows the state after filling with the filling material and joint material of the CC line position in FIG. It is sectional drawing which shows the coupling | bond part of the precast PC girder and the retaining wall in the other Example of this invention. It is the DD sectional view taken on the line in FIG. The other example of the socket formed in the upper end of the H type precast PC pile in this invention is shown, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view. The further another example of the socket formed in the upper end of the H type precast PC pile in this invention is shown, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view. The other example of the H type precast PC pile used in order to comprise the socket in this invention is shown, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view. It is a top view which shows the socket comprised using the H type precast PC pile same as the above. It is sectional drawing which shows the example which implemented this invention to the floor slab frame structure of a bridge. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground 11 Retaining wall 12 Top plate 13 Bottom plate 14 Precast PC pile 14a Web part 14b, 14c Flange part 15 Underpass space 16 Steel bar for bottom plate connection 17 PC tension material 18 Space 19 Filling concrete 20 Socket 21 Opening 25 Precast PC girder 25a Socket fitting projection 30 Filling material filling recess 31 Joint recess 32 PC tension material insertion hole 33 Mortar 35 PC tension material 36 Filling material 40 Recess 45 Abutment 46 Floor slab 50 Side plate 51 Socket 52 Steel fitting 53 Socket 54a Socket front side plate 54b Socket back side plate 55 Temporary fixing plate 56 Connection plate for partition 57 Socket

Claims (10)

A lithographic shape by a precast concrete girder that supports a plurality of precast concrete girders supported in a parallel arrangement between support structures standing upright apart from each other, and integrating the precast concrete girders into a lithographic material. In the frame structure,
At the upper end of the support structure, a large number of sockets opened upward are arranged in a row in the horizontal length direction of the support structure, and are integrally provided.
Provided integrally with a downward socket insertion convex portion that can be inserted into the socket with a gap between the inner surfaces of both pre-cast concrete girders on the lower surface of both ends,
Precast concrete characterized in that the projection for inserting the socket is inserted into each socket on the support structure portion, and a filler is filled in the gap between the socket and the projection for insertion of the socket so as to be integrated with each other. A planographic frame structure with girders.   The planographic structure of precast concrete girders according to claim 1, wherein the planographic object is a top plate constituting an underpass, and the support structure is a retaining wall constituting the underpass. The planographic structure of precast concrete girders according to claim 1, wherein the planographic object is a floor slab of a bridge, and the support structure is a bridge pier or an abutment that supports the floor slab.   The precast concrete according to any one of claims 1 to 3, wherein the support structure is a precast concrete pile that is placed side by side in the ground, and the socket is integrally provided at an upper end of each pile. A planographic frame structure with girders.   The top plate frame structure in the underpass according to claim 4, wherein the socket is a steel tubular member installed at an upper end of the precast concrete pile.   The planographic structure of a precast concrete girder according to any one of claims 4 and 3, wherein the precast concrete pile is a precast concrete pile having an H-shaped cross section.   By removing the web portion of the upper end portion of the precast concrete pile having an H-shaped section by the depth of the socket, and fixing the steel side plate between the front and rear flange edge portions of the web portion removal portion, The planographic structure of precast concrete girders according to claim 6, wherein sockets surrounded by front and rear flange portions and both side plates are integrally provided at the upper end of the pile.   The web part at the upper end of the H-shaped precast concrete pile and one flange part are removed by the depth of the socket, and a steel fitting having a U-shaped cross section is formed at both edges of the other flange part. The both edges are integrated, and a socket surrounded by the other flange portion and the U-shaped steel fitting is integrally provided at the upper end of the pile at the web portion and one flange portion removal portion. A lithographic structure using precast concrete girders. A steel socket front side plate and a socket rear side plate are installed on the outer surface of both flanges at the upper end of the H-shaped precast concrete pile , and between the socket front plate and the socket back plate of the precast concrete pile adjacent to each other. The planographic structure for a precast concrete girder according to claim 6, wherein a plurality of sockets are formed by connecting the front plate and the back plate with a connecting member for partitioning together. As a fastener for integrating the space between the precast concrete girders, using a PC tension material that is inserted in the width direction across the precast concrete girders, introducing prestress in the width direction to the whole lithographic material The planographic structure of a precast concrete girder according to any one of claims 1 to 6.

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