KR101302719B1 - Mold Assembly for Pre-tension Concrete Member and Manufacturing Method of Pre-tension Concrete Member using such Assembly - Google Patents

Abstract

The present invention relates to a mold assembly for manufacturing a pretension PC member in which a tension force is introduced in a pretension manner, and a method for manufacturing a pretension PC member using the same, and specifically, a device capable of mounting a tension member by tension. Integrate with the formwork, the axial force support member is installed in the formwork for forming the pre-tension PC member in the direction of the tension force, and the reaction force holder having the function of the reaction force and the cradle on both ends of the axial force support member And a method of manufacturing a pretension PC member using the same. When using the formwork assembly according to the present invention, by using the axial force supporting member and the reaction force cradle to cast the tension in a state in which the tension member is mounted can be easily produced a pretension PC member of the desired shape.

Description

Formwork assembly for manufacturing pre-tensioned concrete member with reaction force holder for pretension of tension material and manufacturing method of pretension concrete member using same {Mold Assembly for Pre-tension Concrete Member and Manufacturing Method of Pre-tension Concrete Member using such Assembly}

The present invention relates to a form assembly for manufacturing a pretension concrete member in which a tension force is introduced in a pretension method, and a method for manufacturing a pretension concrete member using the same, and specifically, a tension member for introducing a prestress to the concrete member. In the pre-tensioning of concrete before casting, it supports the reaction force generated when the tension force is introduced, and at the same time, a member capable of fixing and mounting the end of the tensioned tension member is integrated with the formwork to form a single assembly, thereby assembling the assembly to the required place. It is possible to make the pretension concrete member easily and easily by moving it, and it can greatly reduce the cost of construction, operation, and maintenance of the fixed equipment by eliminating the need for a separate fixed equipment for tension and mounting of the tension member. As well as freeten Formwork assembly for fabricating pre-tensioned concrete members with a reaction force holder for pretension of tension material configured to produce pretensioned concrete members of desired size and shape by easily responding to cross-sectional size, shape, etc. It relates to a method for producing a tension concrete member.

The pretension method is used as one of the methods of introducing prestress in manufacturing the prestressed concrete member in which the tension material is disposed and the prestress is introduced in the longitudinal direction by tension and fixation of the tension material. In the pretension method, before placing the concrete for the production of the concrete member, the tension member is pre-tensioned and both ends are fixed to the cradle to maintain the tension of the tension member, and then the concrete is cast so that the tension member is embedded in the concrete. When the concrete curing is completed, the end of the tension member is released through a method such as cutting the end of the tension member so that the tension member contracts so that tension force, that is, prestress is introduced into the concrete member.

In order to manufacture the prestressed concrete member (hereinafter, abbreviated as "pretension PC member") by the pretension method, the tension member is tensioned and maintained in tension until the tension is introduced into the finished concrete member. In addition to the need for a separate cradle that can be mounted, as well as a separate reaction force that can support the reaction force generated when the tension is introduced by pulling the tension material.

FIG. 1 is a schematic perspective view showing a state in which a formwork, a reaction force and a cradle are installed to manufacture a double T-type girder as an example of a pretension PC member in the prior art. To manufacture the girder as an example of the pretension PC member, conventionally, the formwork 10 is installed at the manufacturing site as shown in the drawings, and the reaction force 110 is installed at the end of the formwork 10, and the reaction force 110 is provided. On the outside of the cradle 111 was installed. In FIG. 1, member number 112 is a coupling member 112 for coupling between the reaction table 110 and the cradle 111.

As shown in FIG. 1, in the formwork 10, a pretensioning tension member 4 is disposed to be elongated in the longitudinal direction of the girder, and both ends of the tensioner 4 are disposed on the outside of the ends of the formwork 10, respectively. It will penetrate 111. After the tension member 4 protruding to the outside of the holder 111 is bitten by the tension device, the tension device pulls the tension member 4 in the outward direction of the holder 111 to tension the tension member 4, and the tension device is tension member. When pulling (4) in the outward direction, reaction force in the formwork (10) direction is applied to the holder (111). That is, the force to push the cradle 111 in the formwork (10) is to act as a reaction force.

In order to prevent the cradle 111 from moving against such a reaction force, after fixing the reaction force 110 made of a heavy structure such as concrete so as not to move on the ground, the reaction force 110 and the cradle 111 are fixed. By installing the coupling member 112 between the reaction force 110 was used to support the cradle 111 to prevent movement. The tensioned tension material 4 is pulled and fixed to the outer surface of the cradle 111 to maintain a state in which tension is introduced.

As such, in the prior art, in order to support sufficient reaction force required for tensioning the tension member 4, the reaction force 110 made of a heavy structure made of concrete or steel must be fixed so as not to move on the ground. In other words, in order to manufacture the pretension PC member using the prior art, a separate production site is installed firmly fixed to the ground reaction force 110 made of a heavy structure.

Therefore, it is not only a considerable cost to install a stationary equipment, such as the reaction table 110 in the workshop, it is expensive to operate such a workshop. Therefore, in order to operate the shop economically in consideration of the shop operating cost, etc., it is necessary to mass produce the pretension PC member. After all, the pretension PC member is mainly applied only when the pretension PC member is produced in large quantities, despite the advantages in manufacturing, and the production and supply of the pretension PC member are not smooth. The reality is that the utilization is relatively low.

Furthermore, since the reaction table 110 is fixedly installed in the production site, even if the longitudinal length or the transverse width of the pretension PC member is changed, the reaction table 110 cannot be moved accordingly, and thus can be manufactured. The longitudinal length, the transverse width, the size, etc. of the pretension PC member are greatly limited by the fixed reaction force 110. Therefore, the conventional technique as described above has a disadvantage in that it is difficult to produce a pretension PC member having a desired specification in response to changes in specifications such as the longitudinal length or the transverse width of the pretension PC member to be manufactured.

The present invention has been developed to solve the problems of the prior art as described above, specifically in the construction of the pre-tension PC member, the reaction force for supporting the reaction force required for the tension of the tension material to build a structure fixed to the ground The tension member can be easily tensioned and arranged in a pretension manner, so that the pretension PC member can be manufactured without having a large production site, and the longitudinal length of the pretension PC member to be manufactured. Or it is an object to make it possible to manufacture pretension PC member easily correspondingly quickly even if the specifications, such as a lateral width, change.

In order to achieve the above object, in the present invention, as a formwork assembly for forming the pretension PC member, a formwork for forming the pretension PC member, an axial force supporting member for supporting the reaction force for the tension of the tension member, and A tension member is settled and supported by the axial force supporting member to receive a reaction force when the tension member is tensioned; The formwork forms a bottom plate for forming the bottom surface of the pretension PC member, a lower plate and a side plate for forming the transverse outer surface of the pretension PC member, and both longitudinal end faces of the pretension PC member. An end plate for; The axial force supporting member is disposed in parallel with the lower plate or the side plate of the formwork and extended in the longitudinal direction; The reaction force holder is provided with a through hole through the tension material, the inner surface is installed at both ends of the axial force supporting member in the longitudinal direction to be supported by touching the end of the axial force supporting member; When the tension device tensions the tension member by placing the tension member longitudinally in the form in a state in which both ends of the tension member protrude outwardly through the through holes formed in the end plate and the through holes formed in the reaction force holder, respectively. The reaction force in the direction opposite to the direction is applied to the outer surface of the reaction force holder to act as an axial force against the axial force supporting member, so that the bearing force is generated by the axial force supporting member, and the end portion of the reaction force is tensioned with the tension member. Formwork assembly is characterized in that the concrete is poured into the formwork in the fixed state, and the end assembly state of the tension member is released after the curing of the concrete to produce a pretension PC member with the prestress introduced into the concrete; Provided is a method for fabricating a pretension PC member using All.

Specifically, the pretension PC member manufacturing method according to the present invention includes a bottom plate for forming the bottom surface of the pretension PC member, a lower plate and the side plate for forming the transverse outer surface of the pretension PC member, and a pretension. Assembling and installing formwork including end plates for forming longitudinal longitudinal end faces of the PC member; An axial force supporting member for supporting a reaction force for tension of the tension member is disposed in parallel with the lower plate or the side plate of the formwork and extends in the longitudinal direction; When the tension member is settled and the tension member is subjected to reaction force, the reaction force holder, which is formed through the tension member through-hole, is installed at both ends of the axial force supporting member in the longitudinal direction so that the inner surface thereof is supported by touching the end of the axial force supporting member. ; Placing the tension member longitudinally in the form such that both ends of the tension member protrude outwardly through the through holes formed in the end plate and the through holes formed in the reaction force holder, respectively; When the tension member is tensioned by installing a tension device on the protruding portion of the tension member, when the tension member is tensioned, a reaction force in a direction opposite to the direction in which the tension member is pulled is applied to the outer surface of the reaction force holder to act as an axial force on the axial force supporting member. By doing so, the bearing force is generated by the axial force supporting member, and the concrete is poured into the formwork in the state where the end portion is fixed to the reaction force holder while the tension member is in tension; After curing the concrete is characterized in that the pre-stress is introduced into the concrete by releasing the end of the tension member fixed state.

In the formwork assembly of the present invention as described above, and a method of manufacturing a pretension PC member using the same, a plurality of vertical reinforcing ribs are installed on the surface of the bottom plate or side plate of the formwork at intervals in the longitudinal direction; The reinforcing rib is formed with a through hole so as to communicate in the longitudinal direction; The axial force supporting member may be installed to penetrate a through hole formed in the plurality of reinforcing ribs in a longitudinal direction.

According to the formwork assembly according to the present invention, when manufacturing the pretension PC member, there is no need to fix the reaction table made of a heavy structure, which is essentially required in the prior art so as not to move on the ground, There is no need for a separate workshop that is firmly fixed to the ground, and there are many problems associated with the operation of a large-scale workshop with fixed facilities, that is, a considerable cost is required to install the fixed facilities in the workshop. The effect of being able to solve the problem, the limitation which must produce a large amount of pretension PC members, etc. is exhibited.

Particularly, in the present invention, the reaction force supporting member is not fixedly installed on the ground, but the axial force supporting member for supporting the reaction force is provided on the outer surface of the formwork, and has the function of directly receiving the reaction force and fixing and fixing of the tension member. Since the reaction force holder can also be freely changed in size and freely installed to be supported by the axial force supporting member, even if the specifications such as the longitudinal length or the lateral width of the pretension PC member to be manufactured are changed, the length thereof is reduced. By coping with an increased axial force supporting member and the like, it is possible to quickly correspond to a desired shape of the pretension PC member, and the effect of being able to easily produce a pretension PC member having a desired specification is exerted.

Furthermore, in the formwork assembly according to the present invention, the formwork, the axial force supporting member and the reaction force holder are integrated into a single member, and the formwork assembly is not a fixture that is completely fixed to the ground. It has the advantage of being able to manufacture the pretension PC member by moving the formwork assembly to the place where the production of the PC member.

1 is a schematic perspective view showing a state in which a formwork, a reaction force and a cradle are installed to manufacture a double T-type girder as an example of a pretension PC member in the prior art.
Figure 2 is a schematic perspective view showing that the frame member is placed on the ground to install the formwork of the formwork assembly of the present invention.
Figure 3 is a schematic perspective view showing that the bottom plate of the formwork in the formwork assembly of the present invention is installed on the frame member of FIG.
Figure 4 is a schematic perspective view showing that the lower plate of the formwork is installed on the frame member of Figure 2 in the formwork assembly of the present invention.
5 is a schematic perspective view showing that the formwork side plate is installed on the frame member of FIG. 2 in the formwork assembly of the present invention.
Figure 6 is a schematic perspective view showing that the longitudinal end plate of the formwork is installed on the frame member of Figure 2 in the formwork assembly of the present invention.
Figure 7a is a schematic perspective view showing a state in which the reaction force holder is further installed in the formwork assembly of the state shown in FIG.
FIG. 7B is a schematic side view of the formwork assembly shown in FIG. 7A.
FIG. 8 is a schematic perspective view illustrating a state in which a tension member is disposed in the formwork assembly illustrated in FIG. 7A and concrete is poured for manufacturing a pretension PC member.
FIG. 9 is a schematic perspective view illustrating a state in which prestress is introduced to a pretension PC member by cutting a tension member after curing of concrete poured into the formwork assembly of the present invention shown in FIG. 8.
10 is a schematic perspective view showing a state in which the pretension PC member is removed from the formwork assembly of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

The formwork assembly according to the present invention is to integrate the equipment to tension the tension member with the formwork, the axial force supporting member is installed in the formwork for forming the pretension PC member in the direction of tension force introduction, It has a configuration in which reaction force holders, which have the function of reaction force and mount, are installed at both ends of the. When using the formwork assembly according to the present invention, by using the axial force supporting member and the reaction force cradle to cast the tension in a state in which the tension member is mounted can be easily produced a pretension PC member of the desired shape. For reference, in this specification, the direction in which the tension member is extended and the tension force is introduced is denoted as "vertical direction", and the direction orthogonal to the horizontal direction with respect to this longitudinal direction is denoted as "lateral direction".

2 to 11 respectively show a schematic perspective view of each step of the method of fabricating the formwork assembly 1 according to the present invention and then pouring concrete to produce a pretension PC member. 2 to 11 illustrate, as an example of a pretension PC member, a formwork assembly 1 of the present invention and a pretension PC member using the same by illustrating a double T-type girder having two webs perpendicular to the lower surface of the flange plate. The construction method is explained. In the case of the double T-girder illustrated in the drawings, the longitudinal direction of the girder corresponds to the "longitudinal direction", and the width direction of the girder corresponds to the "lateral direction", but is manufactured by the formwork assembly 1 according to the present invention. The pretension PC member is not limited to such a double T-girder, and according to the present invention, a pretension PC member having various shapes and sizes can be manufactured.

 FIG. 2 is a schematic perspective view showing that the frame member 60 is placed on the ground to install the formwork for manufacturing the pretension PC member, and FIG. 3 shows the formwork 10 for manufacturing the pretension PC member. 2 is a schematic perspective view showing that the bottom plate 11 is mounted on the frame member 60 of FIG. 2. FIG. 4 shows a schematic perspective view showing the installation of the bottom plate 12 of the formwork 10 subsequent to FIG. 3, and FIG. 5 shows the installation of the transverse side plate 13 subsequent to FIG. 4. A schematic perspective view is shown, and FIG. 6 shows a schematic perspective view showing the installation of a longitudinal end plate 14 subsequent to FIG. 5.

  First, as shown in FIGS. 2 to 6, in order to manufacture the pretension PC member according to the present invention, the formwork 10 for manufacturing the pretension PC member is assembled. As illustrated in the figure, in order to fabricate a double T girder as an example of a pretension PC member, the bottom plate 11 for forming the bottom surface of the pretension PC member is placed on the frame member 60 placed on the ground ( 2 and 3), after installing the lower plate 12 for forming the lower surface of the pretension PC member (FIG. 4), the side plate disposed to form the transverse outer surface of the pretension PC member ( 13) and end plates 14 for forming both longitudinal end faces of the pretension PC member, respectively, and these plates are integrally assembled to form the formwork 10. At this time, since the frame member 60 is a member used as necessary, the installation may be omitted. In addition, in the above embodiment, the bottom plate 11 and the lower plate 12 have been described as being separated, but the bottom plate 11 and the lower plate 12 may be formed of one plate member.

In the formwork assembly 1 according to the present invention, as shown in Figures 2 to 6, in addition to the formwork 10 made of the assembly of a plurality of plates in addition to the axial force supporting member 20 for supporting the reaction force for the tension of the tension member It is provided. The axial force supporting member 20 is a member extending in the longitudinal direction and disposed in parallel with the plate member for forming the transverse outer surface of the pretension PC member in the formwork 10. In the embodiment shown in the drawings, the plate member for forming the transverse outer surface of the pretension PC member in the formwork 10 is the lower plate 12 and the side plate 13, the axial force supporting member 20 Is disposed in parallel with all of the lower plate 12 and the side plate 13 or any one of them extends in the longitudinal direction.

As described above, in the arrangement of the plate member and the axial force supporting member 20 for forming the transverse outer surface of the pretension PC member in the formwork 10, specifically, as shown in FIGS. 4 to 6, the pretension PC A plurality of reinforcing ribs 130 perpendicular to the surface of the plate member (both lower plate and side plate or any one thereof) for forming a transverse outer surface of the member are installed at intervals in the longitudinal direction, the reinforcing ribs 130 It is preferable to provide the axial force supporting member 20 so as to pass through holes 131 formed in the plurality of reinforcing ribs 130 by forming through holes 131 in the plurality of reinforcing ribs 130. At this time, a plurality of through holes are formed in each of the reinforcing ribs 130 so that the plurality of axial force supporting members 20 are arranged side by side, and the axial force supporting members 20 are preferably arranged in a straight line without being bent. Do. According to the configuration in which the reinforcing ribs 130 are installed on the formwork plate member for forming the transverse outer surface of the pretension PC member and the axial force supporting member 20 is installed so as to penetrate the lower plate 12 and / or While obtaining the effect of reinforcing the side plate 13 by the reinforcing ribs 130, the effect of facilitating the straight arrangement of the axial force supporting member 20 in the longitudinal direction is exerted, and further, the axial force supporting member 20 When the axial force is applied, the additional effect of preventing deformation of the buckling or the like from occurring in the axial force supporting member 20 by the reinforcing rib 130 is also exerted. In the embodiment shown in the drawings, the axial force supporting member 20 is shown as being composed of a circular rod-shaped member (more specifically, circular steel pipe), but is not limited to this, any long rod member may be used. It's okay.

In addition to the formwork 10 and the axial force supporting member 20, the formwork assembly 1 according to the present invention further includes a reaction force holder 30 for tensioning and fixing the tension member. FIG. 7A is a schematic perspective view showing a state in which the reaction force holder 30 is further installed in the state shown in FIG. 6, and FIG. 7B is a side view of FIG. 7A. The reaction force holder 30 is a member through which the tension member penetrates and is a member that receives a reaction force when the tension member is tensioned. As shown in FIGS. 7A and 7B, the tension member through hole 31 is formed therethrough. , Respectively, are installed at both ends of the axial force supporting member 20 in the longitudinal direction, and the surface in the form 10 direction of the reaction force holder 30, that is, the inner surface is installed to be supported by touching the end of the axial force supporting member 20. do.

FIG. 8 schematically shows a state in which the tension member 4 is disposed in the state where the reaction force holder 30 is installed as shown in FIG. 7A, and the concrete 5 is poured in the form 10 for the production of the pretension PC member. A perspective view of phosphorus is shown. As shown in Figure 7a and 7b, when the reaction force holder 30 is installed to produce the formwork assembly 1 according to the present invention, the tension member for subsequently applying a tension force in the longitudinal direction to the pretension PC member ( 4) will be placed. Specifically, the tension member 4 is disposed in the mold 10 in the longitudinal direction, and both ends of the tension member 4 pass through the through holes formed in the end plate 14, respectively, and are formed in the reaction force holder 30. It passes through the through hole 31 and protrudes outward. In the state where the end of the tension member 4 protrudes outward through the reaction force holder 30, the tension member 4 is tensioned using the tension device 70 to settle in the reaction force holder 30.

When tensioning the tension member 4 by the tension device 70, it is necessary to support the reaction force at the time of tension, in the formwork assembly 1 of the present invention, the reaction force holder 30 by the axial force supporting member 20 The reaction force cradle 30 is to support the reaction force acting when the tension member 4 is tensioned. Looking at this in more detail, when the tension device 70 to tension the tension member 4, the reaction force acts in a direction opposite to the direction of pulling the tension member (4). That is, reaction force acting in the direction of the pretension PC member from the end of the tension member 4 is applied to the outer surface of the reaction force holder 30. However, in the formwork assembly 1 according to the present invention, the inner surface of the reaction force holder 30 is in close contact with the end of the axial force supporting member 20. Therefore, when reaction force acts in the direction of the pretension PC member on the outer surface of the reaction force holder 30, such reaction force tries to push the reaction force holder 30 in the direction of the pretension PC member, that is, the inner surface of the reaction force holder 30, that is, the pretension. Since the surface facing the PC member is in contact with the axial force supporting member 20, the reaction force generated during the tension of the tension member 4 will eventually act as an axial force against the axial force supporting member 20. That is, the axial support force of the axial force supporting member 20 acts as a force against the reaction force. Therefore, even if a reaction force is applied, the reaction force holder 30 does not move while being supported by the axial force supporting member 20, and thus the tension device 70 easily moves the tension member 4 in the opposite direction to the formwork 10. I can pull it. That is, in the formwork assembly 1 according to the present invention, the reaction force acting when the tension member 4 is tensioned using the tension device 70 is supported by the reaction force holder 30 and the axial force supporting member 20. With sufficient reaction force, the tension member 4 can be easily tensioned.

The tension member 4, which is tensioned by the tension device 70, is fixed at the outer surface of the reaction force holder 30 and is fixed to the tension member 70, so that the tension member 4 is disposed in the form 10 with pretension applied thereto. The concrete 5 is poured into the formwork 10 in the state in which the pretensioned tension material 4 is disposed so that the concrete 5 hardens in the state in which the tension material 4 is embedded in the concrete 5. In FIG. 8, reference numeral 18 denotes a spacing bar that is disposed to prevent the gap between the two side plates 13 in the transverse direction of the formwork due to the placing pressure when the concrete 5 is poured into the formwork 10. (18), the member number 19 is a rod retaining member 19 is installed in the longitudinal direction in order to engage and secure the end of the spacing retaining rod 18, the member number 17 is the rod retaining member (19) It is a support rod 17 installed between the rod holding member 19 and the frame member 60 to support. The support rod 17, the space retaining rod 18, and the rod retaining member 19 may be omitted if necessary.

FIG. 9 shows a schematic perspective view of the subsequent step in FIG. 8, when the concrete 5 is sufficiently cured, the tension member 4 is released and the pretension PC member 100 made of concrete is released. Allow prestress by pretension to be introduced. The prestress can be introduced in this manner by cutting the end of the tension member 4. FIG. 10 is a schematic perspective view showing a state in which the die 10 is demolded, and as shown in FIG. 10, the pretension PC member 100 into which the prestress is introduced is removed from the die 10 or the die 10 is removed. By disassembly, the preparation of the pretension PC member 100 is completed.

As described above, when fabricating the pretension PC member using the formwork assembly 1 according to the present invention, fixing the reaction table 110 made of a heavy structure that was required in the prior art so as not to move on the ground No need to install That is, in the present invention, since the reaction force holder 30 for fixing the tension member 4 and the axial force supporting member 20 for supporting the reaction force form the formwork assembly 1 in a movable state together with the formwork 10, the conventional Like the technology, the reaction table 110 fixed to the ground is not required at all. Therefore, in manufacturing the pretension PC member using the formwork assembly (1) of the present invention, the reaction table 110 made of heavy structure does not need a separate manufacturing station firmly installed on the ground, and fixed equipment Eggplants can solve various problems associated with the operation of a large-scale workshop, that is, a significant cost to install a fixed equipment in the workshop, the limitation of having to produce a large amount of pretension PC members.

In particular, in the related art, since the reaction force 110 is fixedly installed at the manufacturing site, even if the longitudinal length or the width of the pretension PC member is changed, the reaction force 110 cannot be moved accordingly, and thus can be manufactured. The longitudinal length, the lateral width, the size, and the like of the pretensioned PC member 100 are largely limited due to the fixed reaction force 110. Therefore, according to the prior art as described above, if the specifications such as the longitudinal length or the lateral width of the pretension PC member 100 to be produced are changed, it is difficult to quickly produce a pretension PC member having a desired specification. . However, in the formwork assembly 1 of the present invention, the reaction force supporting member is not fixed to the ground and is not fixedly installed, but the axial force supporting member 20 for supporting the reaction force is provided on the outer surface of the formwork 10, and the reaction force The reaction force holder 30 having a function of directly receiving and fixing and fixing the tension member can also be installed freely to be supported by the axial force supporting member 20 by changing its size freely, so that the longitudinal length of the pretension PC member to be manufactured Alternatively, even if the specifications such as the width of the transverse width are changed, it is possible to quickly correspond to the desired shape of the pretension PC member by coping with the use of the axial force supporting member 20 whose length is reduced or increased in response to this. The eggplant can be easily produced a pretension PC member.

Furthermore, the formwork assembly 1 according to the present invention has a configuration in which the formwork 10, the axial force supporting member 20, and the reaction force holder 30 are integrated into one member, and the formwork assembly 1 is grounded. Since the equipment is not completely fixed to the equipment and can be moved, the mold assembly 1 can be moved to a place where the production of the pretension PC member is required to manufacture the pretension PC member.

1: formwork assembly
10: formwork
20: axial force supporting member
30: reaction cradle

Claims (3)

delete As a formwork assembly 1 for forming and fabricating a pretension PC member,
The die 10 for forming the pretension PC member, the axial force supporting member 20 for supporting the reaction force for tension of the tension member, and the tensioned tension member are supported and supported by the axial force supporting member 20 to tension the tension member. A reaction force holder 30 which is subjected to reaction force when;
The formwork 10 includes a bottom plate 11 for forming a bottom surface of the pretension PC member, a lower plate 12 and a side plate 13 for forming a transverse outer surface of the pretension PC member, An end plate 14 for forming the longitudinal both end faces of the pretension PC member;
A plurality of vertical reinforcing ribs 130 are provided on the surface of the lower plate 12 or the side plate 13 of the formwork 10 at intervals in the longitudinal direction;
Through holes 131 are formed in the reinforcing ribs 130 so as to communicate in the longitudinal direction;
The axial force supporting member 20 is disposed in parallel with the lower plate 12 or the side plate 13 of the formwork 10 and extended in the longitudinal direction, but is formed in the plurality of reinforcing ribs 130. 131 is installed to penetrate longitudinally;
The reaction force holder 30 has a through hole 31 formed therein, and is installed at both ends of the axial force supporting member 20 in the longitudinal direction such that an inner surface thereof is supported by touching the end of the axial force supporting member 20. ;
Both ends of the tension member 4 pass through the through-holes formed in the end plate 14 and the through-holes 31 formed in the reaction force holder 30, respectively. When the tension device 70 tensions the tension member 4 by being disposed in the longitudinal direction in the longitudinal direction, a reaction force in a direction opposite to the direction in which the tension member 4 is pulled is applied to the outer surface of the reaction force holder 30 so that the axial force supporting member ( By acting as an axial force against the 20), the bearing force is generated by the axial force supporting member 20, the formwork 10 in a state in which the tension member 4 is fixed to the reaction force holder 30 in its end The concrete (5) is poured into the form, after the curing of the concrete (5) the end fixed state of the tension member (4) is released to form a pretension PC member of the state in which the prestress is introduced into the concrete (5) Assembly.
As a manufacturing method of the pretension PC member,
The bottom plate 11 for forming the bottom surface of the pretension PC member, the bottom plate 12 and the side plate 13 for forming the transverse outer surface of the pretension PC member, and the longitudinal direction of the pretension PC member. An end plate 14 for forming both end faces, and a plurality of vertical reinforcing ribs 130 are provided on the surface of the lower plate 12 or the side plate 13 at intervals in the longitudinal direction. And assembling and installing the forming dies (10) of the pretension PC member having a configuration in which the through holes 131 are formed in the reinforcing ribs 130 so as to communicate in the longitudinal direction;
The axial force supporting member 20 for supporting the reaction force for the tension of the tension member is disposed in parallel with the lower plate 12 or the side plate 13 of the formwork 10 to extend in the longitudinal direction, the axial force supporting member ( 20 is installed so as to penetrate the through holes 131 formed in the plurality of reinforcing ribs 130 in the longitudinal direction;
When the tensioned tension member is settled and the tension member is tensioned, the reaction force is received and the reaction force holder 30 having the tension member through-hole 31 formed therethrough, so that the inner surface thereof is supported by touching the end of the axial force supporting member 20. Installed at both ends of the axial force supporting member 20;
Both ends of the tension member 4 pass through the through-holes formed in the end plate 14 and the through-holes 31 formed in the reaction force holder 30, respectively. Elongate longitudinally within);
The tension device 70 is installed on the portion protruding to the outside of the tension material 4 to tension the tension material 4, and when the tension material 4 is tensioned, reaction force in a direction opposite to the direction in which the tension material 4 is pulled. By being applied to the outer surface of the reaction force holder 30 to act as an axial force with respect to the axial force supporting member 20, the bearing force is generated by the axial force supporting member 20, the tension member 4 in its tensioned state end The concrete 5 is poured into the formwork 10 in a state fixed to the reaction force holder 30;
Method of producing a pretension PC member, characterized in that the prestress is introduced into the concrete (5) by releasing the end fixed state of the tension member (4) after curing the concrete (5).

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