JP3091672B2 - Method and apparatus for connecting tension wire member of concrete member and integrated connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the connection of a plurality of prestressed concrete members.
In particular, the present invention relates to a method for connecting a tension member to a concrete member, a connection device for a tension member, and an integrated connection structure for a concrete member.

[0002]

2. Description of the Related Art A structure using a plurality of prestressed concrete members connected to each other is not known, but a structure connected while applying a prestress is well known. For example, in Japanese Patent Publication No. 53-15925, the tension members of the concrete members are pulled together by using a special tensioning device, and the tension members are connected and fixed by the connecting member of the cylinder while being tensioned. In such a space, it is often not possible to use such a large and complicated tensioning device, and in particular, it is not only economically and temporally problematic to manufacture a different tensioning device for each site, There is a problem that the danger and difficulty of simultaneously performing the tension management and the connection work of the tension wire members cannot be solved.

[0003]

SUMMARY OF THE INVENTION The present invention distinguishes between the tension management and the connection work of the tension wire members and solves the problem of simultaneous progression, and uses a low-cost and simple-structure member to safely and securely use the members. An object of the present invention is to provide a method for connecting a tension member to a concrete member, a device for connecting a tension member to a concrete member, and an integrated connection structure for a concrete member that can be easily constructed.

[0004]

That is, according to the present invention, there is provided a method of connecting a tension member to a concrete member according to the present invention. Attaching a fastening member via a presumably worn removable member for giving a tensile stress while leaving an extra length at the exposed end, and communicating the opening after the fastening of the fastening member with the opening. Attaching a pair of concrete members and attaching the extra-length portion connecting member with the extra-length portion facing each other. The stress is transmitted to the wire member connected via the extra-length portion connecting member to apply a prestress to the concrete member to form an integrated connection structure.

Therefore, the method of connecting a tension member to a concrete member according to the present invention provides a tension management of a tension member to which a fastening member is mounted via a presumably worn detachable member for applying a tensile stress, and a tension line. Since the connecting operation of transmitting the tensile stress to the line member connected via the connecting member by detaching the assumed wearing removable member by attaching the member to the connecting member is distinguished, the tension management of the pulling line member is tightened. Since only simple tightening work of the attaching member is performed, the equipment used is safe and simple, the equipment used is small and inexpensive, and the connecting operation of the pulling wire member is not performed in parallel with the tensioning work, and the opposed pulling wire is used. By simply fixing the member with the connecting member and removing the assumed wearable removable member, the tensile stress can be transmitted to the connected wire member via the connecting member, and the prestressed concrete member is integrated. Quite concrete can be obtained.

[0006] Further, a tension member connecting device for a concrete member according to the present invention comprises: a concrete member having an opening in which a wire member is previously disposed and exposing a tip portion of the wire member; A hypothetically wearable detachable member for applying tensile stress to the wire member sandwiched between the concrete member and the fastening member and configured by at least a pair of plate members attached so as to leave an extra length portion, and the pair of A surplus portion connecting member for connecting the surplus portions facing each other when the opening is communicated with the concrete member, and removing the assumed wearable removable member after mounting the surplus portion connecting member. The configuration is characterized.

Therefore, the tension member connecting device for a concrete member according to the present invention is such that the tension management is a simple tightening operation of the tightening member with the temporarily removable member sandwiched between the concrete member and the tightening member. Not only is work safe,
It is simple and the tool used is sufficient because only the fastening tool is sufficient, so it is small and inexpensive, and the connection work is as simple as fixing the facing tension wire member with the connection member and removing the assumed wearable removable member. Assuming that the removable member can be easily and safely removed by using a pair of horseshoe-shaped wedge-shaped plates each having a contact surface as a sliding surface, both sides of the wedge-shaped wedge-shaped plate are prevented from slipping. If a detachable locking wedge is provided on the surface, the risk of the horseshoe-shaped wedge-shaped plate slipping by mistake or even by vibration such as an earthquake can be prevented. Further, if the connecting member is constituted by two members parallel to the pulling direction, the connecting operation of the wire members can be performed with the gap adjusting spacer interposed therebetween even if the wire members are slightly displaced from each other.

[0008] Further, the integrated connection structure of a concrete member according to the present invention comprises a concrete member having a wire member disposed therein in advance and having an opening for exposing the front end portion of the wire member, and an extra space at the front end portion of the wire member. A hypothetically wearable detachable member that is constituted by at least a pair of plate members attached to the concrete member and the fastening member and that applies a tensile stress to the wire member while leaving a long portion, and the pair of concrete members An extra length connecting member that connects the extra length portions facing each other when the opening portion is communicated with the opening portion by removing the assumed wearing removable member after the extra length connecting member is attached. It is characterized in that a tensile stress is transmitted to a wire member connected via the extra length connecting member to apply a prestress to the concrete member.

Therefore, in the integrated connection structure for concrete members according to the present invention, the tension management of the wire members can be performed at the factory or the like, so that the tension management of the wire members at the site can be eliminated, and the connection work can be performed at low cost and with a simple structure. Construction can be performed safely, easily, and quickly using the member having the configuration.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall cross-sectional view of a tunnel formed by a concrete segment 1 as a concrete member. The left half shows the completed state of the concrete segment 1 before completion, and the right half shows the state of the completed tunnel. Things. That is, in the left half state of FIG. 1, the tunnel as an integral connection structure of the concrete segment 1 applies a tensile stress to the PC steel material 2 which is a wire member. The PC steel material 2 is fastened and fixed with the nut 4 via the outer member 3, and the PC steel material 2 is connected by the connecting member 13 shown in FIGS. 4 and 5. In the completed state of the right half of FIG. 1, the assumed wearing detachable member 3 is removed and the PC steel material 2 of the entire tunnel is removed.
Is evenly prestressed.

More specifically, FIG. 6 and FIG. 7 show a concrete segment 1 which can be attached also in the direction of the cylinder axis of the tunnel via an attachment member, but the explanation is omitted here. The illustrated concrete segment is integrally connected in the circumferential direction to the state of FIG. 1 by connecting the PC steel material 2 in a ring shape via a sheath 5 inside the concrete segment. The concrete segment 1 shown in FIG. 6 is for explaining the inside of the concrete segment, and the hatched portion indicates a portion where the concrete segments are in contact with each other, and four concave portions 6 are formed inside the hatched portion. I have. This recess is shown more clearly in FIG. 2 and can be used to apply a tensile stress to the PC
Is a space for connecting. FIG. 7 is a cross-sectional view showing a state where a tensile stress is applied to the PC steel material 2 disposed in the concrete segment 1. In this manner, when the PC steel material 2 is subjected to the tensile stress, the concrete segment 1 No tension work is required when connecting the PC steel materials 2 at the connection site.

In addition, the assumed-wearable detachable member 3 facilitates attachment and detachment, and generates vibrations and shocks while the concrete segment 1 is being conveyed to a connection site or during work while a tensile stress is applied to the PC steel material 2. It has a structure for preventing inconvenience of receiving and coming off. As shown in detail in FIG. 3, a pair of horseshoe-shaped wedge-shaped plates 7A and 7B and a pair of locking wedges 8 are provided. The horseshoe-shaped wedge-shaped plates 7A and 7B have a U-shaped hole 9 for receiving the PC steel 2 in FIG.
A and 10B are formed, and the sliding surface 11 of the horseshoe-shaped wedge-shaped plate is inclined so as to obtain an appropriate amount of sliding. Moderate slippage for removability.

As shown in FIG. 2, the concrete segments 1 having a tensile stress applied to the PC steel material 2 are brought into contact with each other at their end faces, and are exposed from the nuts 4 in the openings 6 thereof.
Both extra length parts 12 at the tip of the steel material 2 are connected to the extra length connection member 13. This extra-length connecting member is shown in FIG. 8, and as shown in FIG. 9, is constituted by a split member 14 in parallel with the tensile direction of the PC steel material 2, and a recess for guiding the PC steel material 2 is formed on the cracked surface. doing. An extra length portion 12 at the end of the PC steel material 2 is sandwiched between two split members 14, and the two split members are fixed with four bolts and nuts to connect the extra length portion connecting member 1.
4 is inserted through the extra length connecting member 13 by inserting a washer from the tip of the extra length portion 12 protruding into the nut 3 and screwing the nut together to restrict the movement of the PC steel material 2 in the tension direction. They are connected as shown in FIG.

After connection as shown in FIGS. 4 and 5, FIG.
In the direction of the arrow shown in FIG.
, And the horseshoe-shaped wedge-shaped plates 7A, 7B are slid with a hammer or the like to slide in the direction of the arrow shown in FIG. 4 to remove the horseshoe-shaped wedge-shaped plates 7A, 7B from the recess 6, and the concrete segments in the state of FIGS. A pre-stress is introduced into a tunnel, which is an integrated connection structure.

FIG. 12 shows a concrete segment using a double-structured PC steel according to another embodiment corresponding to FIG. When it is necessary to carry out the prestressing given to the concrete segment after the connection work is completed, insert the tensile PC steel into a hollow compression pipe in which the surface of the PC steel to be used is unbonded, and tighten it.
Assuming that the reaction force is two-fold with the lid plate
Are laid in three layers, and a nut and a washer are combined and assumed. In this case, the prestress is not introduced into the concrete segment at this time, but the prestress is introduced after the connection of the connecting members is completed. In addition, the extra-long part connecting member according to another embodiment shown in FIG. 13 is obtained by integrating the two-piece member shown in FIG.

As is apparent from the above description, the tunnel, which is an integral connection structure of concrete segments, is constructed by assembling pre-stressed concrete segments in a field shield, assembling them in a circumferential direction, and abutting.
Without the tension control of PC steel in the field shield, the connection and connection of PC steel can be performed safely and quickly except for tension control, and the conventional circumferential concrete segment joint is also reinforced with the use of PC steel. As a result, it is possible to provide an economically prestressed tunnel having a very simple structure, such as eliminating the need for a normal bolt box in the structure. In addition, if it is anticipated that bolts need to be re-tightened in connection with the excavation of the shield, it is also possible to select the timing of introducing prestress and provide an elastic and rigid tunnel, so that it can withstand the pressure due to external force. , Conventional RC
The required amount of reinforcing steel can be reduced as compared with the structure, and the tunnel structure can be provided with a small wall thickness and a small outside diameter with a small amount of excavated soil.

[0017]

According to the present invention, the tension management of the tension wire member to which the fastening member is mounted via the provisionally wearable detachable member for applying the tensile stress, and the provisional wear by mounting the tension wire member to the connecting member are provided. Disconnecting the detachable member to separate the connecting operation to transmit the tensile stress to the connected line member via the connecting member. The present invention provides a method for connecting a tension member of a concrete member, a device thereof, and an integrated connection structure, which can be safely and easily constructed by using a member having an inexpensive and simple structure, and can apply a prestress to the concrete member. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tunnel structure according to the present invention.

FIG. 2 is an assembly view of a presumably worn removable member in a recess of a concrete segment.

FIG. 3 is an exploded perspective view of an assumed wearing removable member.

FIG. 4 is a sectional view of a concave portion of a concrete segment showing a direction in which a hypothetical wearing removable member is removed.

FIG. 5 is a plan sectional view of FIG. 4;

FIG. 6 is a perspective view showing the inside of a concrete segment.

FIG. 7 is a cross-sectional view showing a state in which a tensile stress is applied to a PC steel material in a concrete segment.

FIG. 8 is a cross-sectional view illustrating an assembled state of the extra-length portion connecting member.

FIG. 9 is a perspective view showing a split member of the extra-long part connecting member.

FIG. 10 is a cross-sectional view of the concave portion of the concrete segment showing a state where the assumed wearable removable member is removed.

FIG. 11 is a plan sectional view of FIG. 10;

12 is a cross-sectional view showing a state where a tensile stress is applied to a PC steel material in another embodiment in a concrete segment corresponding to FIG. 7;

FIG. 13 is a perspective view showing an extra-long part connecting member according to another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 concrete segment 2 PC steel material 3 assumed removable member 4 nut 5 sheath 6 concave portion 7A horseshoe-shaped wedge-shaped plate 7B horseshoe-shaped wedge-shaped plate 8 locking wedge 9 U-shaped hole 10A locking wedge recess 10B locking wedge recess 11 Sliding surface of horseshoe-shaped wedge-shaped plate 12 Extra-long part 13 Extra-long part connecting member 14 Splitting member

Claims (4)

(57) [Claims] 1. A tentative wear-removal for applying a tensile stress to an exposed end of a wire member which is disposed in advance in at least a pair of concrete members and whose tip is exposed at an opening, leaving an extra length at the exposed end. Mounting the tightening member via a possible member, and connecting the pair of concrete members by communicating with the opening after the tightening of the tightening member, and connecting the excess length portion by facing the excess length portion. Mounting the member, removing the assumed wearable removable member after mounting the extra length connecting member, transmitting the tensile stress to the line member connected via the extra length connecting member, A method of connecting a tension member to a concrete member, wherein a prestress is applied to the concrete member to form an integral connection structure. 2. A concrete member having an opening in which a wire member is previously disposed and exposing a tip portion of the wire member, and at least one pair of plates attached to the tip portion of the wire member while leaving an extra length at the tip portion. Assuming that the concrete member and the fastening member are sandwiched between the concrete member and the fastening member to apply a tensile stress to the wire member, the detachable member is worn, and when the opening is communicated by the contact of the pair of concrete members. An extra length connecting member for connecting the opposing extra length portions, and the provisional wearing detachable member is detached after the extra length connecting member is attached, the tension wire member connecting device for a concrete member. 3. The pair of horseshoe-shaped wedge-shaped plates, wherein the assumed wearable detachable members are a pair of horseshoe-shaped wedge-shaped plates each having a contact surface as a sliding surface. 3. The connecting device according to claim 2, wherein a free locking wedge is provided. 4. A front end of the wire member, wherein the wire member is previously disposed inside.
A concrete member having an opening exposing a portion;
A small amount of wire is attached to the distal end of the wire member, leaving an extra length.
Both are composed of a pair of plate members and are fastened to the concrete member.
For applying tensile stress to the wire member sandwiched between the attached members
Assumed wearing detachable member and the pair of concrete members
When the opening is communicated by contact of the
And a surplus portion connecting member for connecting the surplus portion.
After attaching the binding member, remove the assumed wearing removable member
The tensile stress was connected via the extra length connecting member
To the concrete member and
Of concrete members,
Connection structure.