JP2005254692A - Form for manufacturing prestress concrete sleeper by pretension system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form for manufacturing a prestress concrete sleeper which can be easily manufactured at a low cost. <P>SOLUTION: A form main body 4 for manufacturing a sleeper made of a high-strength concrete equipped with a longitudinal channel 3 for placing a concrete with a channel-shaped crosssection, is constituted by providing integrally side wall parts 2 made of the high-strength concrete on both front and back sides of a bottom wall part 1 made of the high-strength concrete extending in the left and right directions. Over respective side wall parts 2 on the left and right both end parts of the form main body 4 for manufacturing the sleeper, supporting plates 5 respectively acting as end part forms are removably fitted. A fitment 7 for fixing with a female screw hole 6 for fixing a PC steel material is provided on each supporting plate 5 so as to pass the shaft part through it, so that the PC steel material 8 can be arranged under a stretched condition over the fitments 7 for fixing of the facing supporting plates 5. In addition, reaction force PC steel rods are arranged on the outsides of respective side wall parts of the form main body for manufacturing the sleeper made of a steel, and both end parts of respective reaction force PC steel rods are respectively fitted on the supporting plates to constitute a reaction force frame, and to make the reaction force frame to be a reaction force receiver when the PC steel material is stretched. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a formwork for manufacturing a prestressed concrete sleeper by a pretension system.

  In general, when producing prestressed concrete sleepers, the pretension method uses a long line method in which the reaction force of the tension force of PC steel is supported by an abut embedded in the ground, and a mold that provides the reaction force to the formwork body. There is a method. (For example, see Patent Document 1)

  In the former long line method, the abutment will be permanently installed at the production site, and the equipment will generally be enlarged, including the overall structure, but the number of production can be increased at one time, making it suitable for mass production. However, there is a problem that the work procedure is complicated. The latter mold method has a merit that the equipment cost is low and the production adjustment is easy, although a strong formwork is required because the reaction force of the tension force of the PC steel material is applied to the formwork body. The present invention belongs to a formwork for manufacturing a prestressed concrete sleeper by a pretension system used in the latter mold system.

Conventionally, mold molds are manufactured by processing steel plates. To make the structure to receive the reaction force of PC steel, the thickness of each steel plate part of the mold body is increased, or a reinforcing material is used. Since it is reinforced by adding many, it is desirable to make it cheap when using a large number of molds.
Japanese Patent Laid-Open No. 2001-9824

As mentioned above, if the steel plate thickness of each steel plate part of the formwork body is increased or the formwork for manufacturing prestressed concrete sleepers with a large amount of reinforcing material added, the formwork device becomes high and a large number of formwork is used. Then, how to make an easy and inexpensive formwork becomes an important issue.
An object of the present invention is to provide a formwork for manufacturing prestressed concrete sleepers that is easy to manufacture and inexpensive.

In the prestressed concrete sleeper manufacturing form according to the pretension system of the first invention, side walls 2 made of high-strength concrete are integrally provided on both front and rear sides of a bottom wall 1 made of high-strength concrete extending in the left-right direction. , A formwork body 4 for manufacturing a sleeper made of high-strength concrete provided with a long groove 3 for placing concrete having a cross-sectional groove shape, and each side wall portion 2 at both left and right ends of the formwork body 4 for manufacturing the sleeper A support plate 5 that also serves as an end formwork is detachably attached, and a fixing fitting 7 having a female screw hole 6 for fixing a PC steel material is provided in each support plate 5 so that its shaft portion is inserted. The PC steel material 8 can be arranged in a tensioned state across the fixing bracket 7 of each supporting plate 5 to be opposed.
Further, in the prestressed concrete sleeper manufacturing form according to the pretension system of the second invention, the steel side wall 2 is integrally formed on both the front and rear sides of the steel bottom wall 1 extending in the left-right direction. A steel formwork for sleepers comprising a steel sleeper production form body 4 provided with a long groove 3 for placing concrete having a cross-sectional groove shape and having reinforcing ribs 9 on the outside of each side wall 2 10 is provided with a reaction force PC steel rod insertion hole in each reinforcing vertical rib 9 to insert the reaction force PC steel rod 12, and both ends of each reaction force PC steel rod 12 are attached to the support plate 5 respectively. A frame 13 is formed, and the reaction force frame 13 is used as a reaction force receiver when the PC steel material is disposed in the long groove 3, and the PC steel material 8 is disposed over the fixing bracket 7 of each support plate 5. It can be arranged in a tension state.
Further, in the third invention, in the prestressed concrete sleeper manufacturing form according to the pretension system of the first invention or the second invention, the fixing bracket on one end side includes a male threaded shaft portion having a female screw hole at both ends and a nut. It is characterized by comprising.
Further, in the fourth invention, in the prestressed concrete sleeper manufacturing form according to the pretension system of the first invention or the second invention, the shaft having the female screw hole 6 for fixing the PC steel material in the fixing bracket 7 in the long groove 3. It arrange | positions so that a part may be located, The length of the said PC steel material 8 is made shorter than the length of the elongate groove | channel 3. It is characterized by the above-mentioned.
Further, in the fifth invention, in the prestressed concrete sleeper manufacturing form according to the pretension system of the second invention, a buckling prevention vertical rib for preventing buckling of the reaction force PC steel bar is provided on the side wall portion. It is characterized by.

According to the first invention, since the mold body is made of high-strength concrete, a strong mold body can be easily manufactured at a low cost, and the PC steel material is tensioned to the fixing bracket of each support plate. Since it can be arranged, a formwork for producing a prestressed concrete sleeper by a pretension system can be easily manufactured.
According to the second invention, when the PC steel material is tensioned, the reaction force is applied by the reaction force frame provided with the reaction force PC steel rod arranged outside the mold body without taking the reaction force on the mold body. Therefore, an economical formwork for manufacturing sleepers using an existing steel formwork can be obtained without making the formwork body thick and high-strength formwork body.
According to the third invention, the tension force can be introduced into the PC steel material by easily connecting the male thread portion of the tension force introducing device to the female thread hole of the fixing metal fitting on one end side and taking the reaction force on the support plate. .
According to the fourth invention, the PC steel material is used because the PC steel material having a dimension shorter than the length of the long groove is used because the shaft portion of the fixing bracket is positioned in the long groove in the mold body. It is possible to fix the tension by connecting to the fixing bracket arranged from the outside of the end part formwork in a state of being arranged in the shank groove.
According to the fifth invention, when a tensile force is introduced into the PC steel bar in the mold, even if a compressive force is applied to the PC steel bar as a reaction force, the side wall of the steel mold is prevented from buckling. The buckling of the reaction force PC steel bar can be easily prevented by simply providing the vertical rib for use.

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

  1 to 4 show a prestressed concrete sleeper mold according to the pretension system of the first embodiment of the present invention, in which FIG. 1 (a) is a plan view, and FIG. 1 (b) is a side view. 2 is a front view of FIG. 1, FIG. 3 is a partially cutaway plan view showing the vicinity of the end of FIG. 1 (a) in an enlarged manner, and FIG. 4 shows a state in which concrete is placed by tensioning a PC steel material. It is a top view.

  The prestressed concrete sleeper manufacturing formwork body 4 according to the first embodiment has a high strength concrete side wall 2 integrally formed on both front and rear sides of a high strength concrete bottom wall 1 extending in the left-right direction. A form body 4 for manufacturing a sleeper made of high-strength concrete having a long groove 3 for placing concrete having a groove-shaped cross section is provided.

  On the bottom wall 1 and the side wall 2, an end plate 14 made of a steel plate is fixed to a female screw fitting (insert) 15 embedded and fixed in the bottom wall 1 and the side wall 2 by a flat head screw 16. And the end surface of the side wall part 2 is protected. A support plate 5 that also serves as an end mold is disposed outside each end plate 14, and both front and rear ends of the support plate 5 are attached to female screw fittings (inserts) 17 that are embedded and fixed in the side wall 2. The bolt 18 is detachably attached. For this reason, the end plate 14 is provided with a lateral hole through which the bolt 18 is inserted.

  A PC steel material 8 is disposed in the intermediate portion of the support plate 5 in the width direction, and a plurality of horizontal holes 19 are provided through which the shaft portion of the fixing bracket 7 is inserted. A plurality of horizontal holes 19 are provided between the opposing support plates 5. The PC steel material 8 is disposed, and the end portion of each PC steel material 8 is screwed and fixed to the female screw hole 6 of the shaft portion 20 in the fixing bracket 7 in which the shaft portion 20 is inserted into the horizontal hole 19.

  The fixing bracket 7 on one end side has a structure in which a female screw hole 6 is formed in a male screw shaft portion 20 of a hexagonal bolt, a bolt head 21 is locked to the outside of the support plate 5 on one end side, and the other end side. The fixing fitting 7a is composed of a male threaded shaft portion 7b having female screw holes 6 and 22 at both ends and a nut 7b, and has a small diameter located on the long groove 3 side of the female screw holes 6 and 22 at both ends. The female screw hole 6 is a female screw hole 6 for connecting the ends of the PC steel material, and the large-diameter female screw hole 22 opened to the outside of the support plate 5 is a female screw hole for connecting to a tension device (not shown).

  The end portion of the PC steel material 8 is connected to the female screw hole 6 of the male screw shaft portion 20 in the fixing metal fitting 7 on the one end side and the female screw hole 6 in the fixing metal fitting 7a on the other end side. The state in which the nut 7 b is engaged with the outer side of 5 is the state shown in FIG. 1.

  The state shown in FIG. 1 is a state in which no tension is introduced into the PC steel material 8, and from this state, the male screw shaft portion for connection is inserted into the female screw hole 22 of the male screw shaft portion 7b of the fixing bracket 7a on the other end side. PC steel material in which a male screw shaft portion for connection in a tensioning device (not shown) such as a provided jack or a center hole jack to which a male screw shaft portion for connection is attached is screwed in and a reaction force is applied to the support plate 5 When tension is applied by pulling 8, a gap is generated between the support plate 5 and the nut 7 b, so that the nut 7 c in the fixing bracket 7 a on the other end side is engaged with the support plate 5 in order to eliminate this gap. FIG. 4 shows the state.

  The prestressed concrete sleeper manufacturing form 15 according to the first embodiment of the first embodiment is mounted on the formwork body 4 made of high-strength concrete, the end formwork 11, the support plate 5, and each support plate 5. Fixing brackets 7 and 7a.

  Before or at an appropriate time, a release material is applied to the inner surface of the mold, and after the state shown in FIG. 4, concrete 23 is placed in the mold as shown by a two-dot chain line, and cured and cured. The fixing brackets 7 and 7a are removed, the mold is removed from the support plate 5 which also serves as the end mold and the mold body 4, and the end portion of the PC steel material 8 at the end of the concrete sleeper body is also used as a shaft portion. A concrete sleeper is manufactured by filling the groove at the end of the sleeper formed by 20 with a repair material such as mortar.

  As in this embodiment, when the PC steel material 8 is set up to the opposite inside of the support plate 5 in a tensioned state, the cutting process of the end portion of the PC steel material 8 is not required after demolding. Sleepers can be made.

  Further, if both ends of the PC steel material 8 are provided with male screw portions, the PC steel material 8 can be easily connected to the fixing brackets 7 and 7a, and the PC steel material 8 can be arranged at a predetermined position.

  In the first embodiment, since the mold body 4 is a high-strength concrete mold body 4, a strong mold body 4 can be easily manufactured at low cost, and therefore, for producing prestressed concrete sleepers by a pretension system. Formwork can also be easily manufactured.

  Further, since the shaft portion 20 having the female screw hole 6 for fixing the PC steel material in the fixing fittings 7, 7 a is positioned in the long groove 3, the above-described configuration is possible so that the shaft portion 20 can be disposed between the support plates 5. The length of the PC steel material 8 can be made shorter than the length of the long groove 3.

  5 to 9 show a formwork for producing a prestressed concrete sleeper according to the pretension system of the second embodiment of the present invention, in which FIG. 5 (a) is a plan view, and FIG. 5 (b) is a side view. 6 is a front view of FIG. 1, FIG. 7 is a cross-sectional plan view showing the arrangement of reaction force PC steel bars, FIG. 8 is a partially cutaway plan view showing the vicinity of the end of FIG. 7, and FIG. It is a partially notched top view which shows the state which lays steel and casts concrete.

  In this 2nd Embodiment, the existing steel formwork main body 10 is made into the formwork body 4 for prestressed concrete sleeper manufacture by a pretension system using the existing steel formwork main body 10 made of steel. Is provided integrally on the support base 24, and has steel side wall portions 2 integrally on the front and rear sides of the steel bottom wall portion 1 extending in the left-right direction, and is used for placing concrete with a groove-shaped cross section. A part of the formwork main body 4 for manufacturing a steel sleeper provided with the long groove 3 is constructed.

  Further, it is an existing steel sleeper mold 10 having reinforcing ribs 9 that reinforce the sidewalls 2 on the outer side, and is used against the reinforcing ribs 9 on the outer side of the sidewalls 2. A force PC steel rod insertion hole 25 is provided, and if necessary, a buckling prevention vertical rib 26 having a reaction force PC steel rod insertion hole 25 is provided in parallel with a space between the reinforcing vertical ribs 9. It arrange | positions and it fixes to each side wall part 2 by welding, and the sleeper manufacturing form | mold main body 4 is comprised (refer FIG. 7).

  A thick steel plate support plate 5 also serving as an end formwork is disposed over each side wall 2 on one end side (the left end side in the figure) of the sleeper manufacturing formwork body 4.

  Further, the end molds 11 made of steel plates are in contact with each other over the side walls 2 on the other end side (the right end side in the drawing) of the sleeper manufacturing mold main body 4, and the end molds 11 are arranged in contact with each other. A thick steel plate support plate 5 is arranged on the outside of the steel plate, and a reaction force PC steel rod 12 is inserted over the reinforcing vertical rib 9 and buckling prevention vertical rib 26, and each reaction force PC The male threaded shaft portion 12b at one end of the steel rod 12 is screwed and fixed to a nut 27 fixed to the projecting portion 28 of the support plate 5 on the one end side provided so as to project laterally from the side wall portion 2. ing.

  Further, the other end portion of each reaction force PC steel bar 12 is provided with a lateral hole 29 provided in the projecting portion 28 of the support plate 5 on the other end side provided so as to project more laterally than the side wall portion 2. The support plate 5 is gripped by a support nut 30 and a fixed nut 31 which are disposed on both sides of the support plate 5 and screwed into the male threaded shaft portion 12a of the reaction force PC steel rod 12. Is fixed. (See Figure 7)

  The reaction force PC steel rod 12 and the support plates 5 at both ends thereof constitute a flat frame-like reaction force frame 13 that functions as a reaction force receiver when the PC steel material 8 is put in a tension state. The reaction force is not applied to the main body 4.

  A female screw hole 32 (see the right part of FIG. 8) is provided at the center of the support plate 5 on the other end side, and the end mold 11 is pressed by a tip of a bolt 33 screwed into the female screw hole 32. A support plate 5 that closes the end of the frame main body 4 and also serves as an end mold on one end side through the end mold 11 on the other end side and the reaction force PC steel rod 12 is used as the mold main body 4. The end face of the mold body 4 is closed by being pressed by the end face.

  In addition, a plurality of lateral holes 19 and 34 are provided at intervals on the center side of the end mold 11 on the other end side and the support plates 5 within the level of the long groove 3.

  That is, a plurality of lateral holes 19 for inserting the shaft portions 20 of the fixing fittings 7 and 7a for tension-fixing the PC steel material 8 at the intermediate portions in the width direction of the respective support plates 5 and the end molds 11 are provided. 34, and a plurality of PC steel members 8 are arranged between the opposing support plates 5, and the end portions of the PC steel members 8 are fixed to the fixing brackets 7 and 7a inserted through the horizontal holes 19 and 34, respectively. It is screwed and fixed in the female screw hole 6 of the shaft portion 20.

  More specifically, the fixing bracket 7 on one end side has a structure in which a female screw hole 6 is formed in the shaft portion 20 of the hexagonal bolt, as in the above-described embodiment, and a bolt head 21 on the outer side of the support plate 5 on one end side. The fixing bracket 7a on the other end side is constituted by a male threaded shaft portion 7b having female screw holes 6 and 22 at both ends and a nut 7c, of the female screw holes 6 and 22 at both ends. The small-diameter female screw hole 6 located on the long groove 3 side is a female screw hole 6 for connecting the ends of the PC steel material, and the large-diameter female screw hole 22 opened to the outside of the support plate 5 is a tension not shown. It is an internal thread hole for connecting with the external thread shaft part in an apparatus.

  As described above, the end mold 11 and the support plate 5 on the other end side have a plurality of lateral holes 19 or 34 for inserting the male screw shaft portion 7b in the fixing bracket 7a on the other end side. Therefore, the end mold 11 and the support plate 5 may be provided with a concave portion on one side and one or more convex portions that fit into the concave portion on the other side so that alignment can be performed. .

  The end portion of the PC steel material 8 is screwed and arranged across the female screw hole 6 of the male screw shaft portion 20 in the fixing bracket 7 on the one end side and the female screw hole 6 in the fixing bracket 7a on the other end side, and the support on the other end side. FIG. 5 shows a state where the nut 7b is engaged with the outside of the plate 5 and the end mold 11 is pressed toward the mold body 4 by the tip of the bolt 33 to close the end of the mold body 4. State.

  Further, the state shown in FIG. 5 is a state in which no tension is introduced into the PC steel material 8 as in the above embodiment, and from this state the female screw hole of the male screw shaft portion 20 in the fixing fitting 7a on the other end side. 22 is screwed and connected to a male screw shaft portion in a tensioning device (not shown) such as a jack provided with a male screw shaft portion for connection or a center hole jack attached with the male screw shaft portion for connection. When the PC steel material 8 is pulled and tensioned so that the reaction force is applied to 5, a gap is formed between the support plate 5 and the nut 7b. Therefore, in order to eliminate this gap, the nut 7b in the fixing bracket 7a on the other end side is formed. 9 is a state shown in FIG. 9 that is engaged with the support plate 5 by being rotated in a direction approaching the support plate 5.

  The prestressed concrete sleeper mold 4 according to the second embodiment of the second embodiment includes a steel mold body 4, end plate molds 11, support plates 5, and reaction force PC steel bars 12. And fixing brackets 7 and 7a attached to each support plate 5.

  The prestressed concrete sleeper mold 4 according to the second embodiment of the second embodiment is provided with a reaction force PC steel rod insertion hole 25 in the reinforcing vertical rib 9 in the existing steel mold body 10 and a new one. A vertical rib 26 for preventing buckling of the reaction force PC steel rod 12 to prevent buckling is attached, and only one end mold 11 and two support plates 5 and bolts are attached. Since it can be used as a form for producing prestressed concrete sleepers by a pretension system, it can be easily produced economically by using an existing steel form for producing sleepers.

  And like the said embodiment, after apply | coating a peeling material to a mold inner surface and making it the state of FIG. 9, after placing concrete 23 as shown by a dashed-two dotted line in a mold, and carrying out curing hardening, The fixing brackets 7 and 7a are removed, the bolts 33 are loosened, the end mold 11 and the support plate 5 which also serves as the end mold and the mold body 4 are removed, and the PC steel material at the end of the concrete sleeper body A concrete sleeper is manufactured by filling the groove at the end of the sleeper formed by the male screw shaft 7a with a repair material such as mortar and filling it with the end rust prevention treatment of No. 8.

  When the reaction force frame 13 is configured outside the mold as in the above-described embodiment, the end mold 11 is pressed against the mold body by the bolts 33 attached to the support plate 5 in the reaction force frame 13. The end of the mold body can be closed. Moreover, if it is set as the PC steel material 8 of the dimension accommodated in the state before tension | tensile_strength in the elongate groove | channel 3, arrangement | positioning of the PC steel material 8 will be easy.

The form for prestressed concrete sleeper manufacture by the pretension system of 1st Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a side view. It is a front view of FIG. FIG. 2 is a partially cutaway plan view showing an enlarged vicinity of an end portion of FIG. It is a top view which shows the state which strains PC steel materials and places concrete. The form for prestressed concrete sleeper manufacture by the pretension system of 2nd Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a side view. It is a front view of FIG. It is a cross-sectional top view which shows the arrangement | positioning state of reaction force PC steel bar. FIG. 8 is a partially cutaway plan view showing an enlarged vicinity of the end portion of FIG. 7. It is a partially notched top view which shows the state which tensions PC steel materials and casts concrete.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottom wall part 2 Side wall part 3 Elongate groove | channel 4 Form body 5 Supporting plate 6 Female thread part 7 Fixing metal fitting 7a Fixing metal fitting 7b Shaft part 8 with a male screw PC steel material 9 Vertical rib 10 for reinforcement Steel mold frame main body 11 End Part frame 12 Reaction force PC steel rod 12a Male threaded shaft part 12b Male threaded shaft part 13 Reaction force frame 14 End plate 15 Female threaded fitting (insert)
16 Countersunk screw 17 Female thread fitting (insert)
18 Bolt 19 Horizontal hole 20 Shaft portion 21 Bolt head portion 22 Female screw hole 23 Concrete 24 Support base 25 Reaction force PC steel rod insertion hole 26 Vertical rib 27 for buckling prevention Nut 28 Overhang portion 29 Horizontal hole 30 Bearing nut 31 Fixing nut 32 Female screw hole 33 Bolt 34 Horizontal hole

Claims (5)

  A side wall made of high-strength concrete is integrally provided on both the front and rear sides of the bottom wall made of high-strength concrete that extends in the left-right direction, and is made of high-strength concrete with long grooves for placing concrete with a cross-sectional groove shape. A sleeper manufacturing formwork body is constructed, and over each side wall portion of the left and right ends of the sleeper manufacturing formwork body, a support plate that also serves as an end formwork is detachably attached. A pretension, characterized in that a fixing bracket having a female screw hole for fixing a PC steel material is provided so as to pass through the shaft portion, and the PC steel material can be placed in a tensioned state across the fixing brackets of the respective supporting plates. Formwork for manufacturing prestressed concrete sleepers by the method.   A formwork for manufacturing steel sleepers having a steel side wall part integrally on both front and rear sides of a steel bottom wall part extending in the left-right direction and having a long groove for placing concrete with a cross-sectional groove shape While providing a reaction force PC steel rod insertion hole in each said reinforcement vertical rib in the steel formwork for sleepers which has a main body and has a reinforcement vertical rib on the outside of each side wall part, it inserts a reaction force PC steel rod Both ends of each reaction force PC steel bar are attached to the support plate to form a reaction force frame. The reaction force frame is used as a reaction force receiver when the PC steel material is placed in the long groove. A formwork for producing prestressed concrete sleepers by a pretension system, characterized in that a PC steel material placed across a fixing metal fitting on a plate can be placed in a tension state.   The prestressed concrete sleeper manufacturing method according to claim 1 or 2, wherein the fixing bracket on one end side is constituted by a male threaded shaft portion having a female screw hole at both ends and a nut. Formwork for.   It is arranged so that a shaft portion having a female screw hole for fixing a PC steel material in a fixing metal fitting is located in the long groove, and the length of the PC steel material is shorter than the length of the long groove. A formwork for producing a prestressed concrete sleeper by the pretension system according to claim 1 or 2.   3. A prestressed concrete sleeper manufacturing form according to claim 2, wherein a buckling preventing vertical rib for preventing buckling of the reaction force PC steel bar is provided on the side wall. .

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