JPH0712506U - Beam fall prevention device - Google Patents

Abstract

(57) [Summary] [Object] To provide an inexpensive and lightweight beam fall prevention device with high positioning accuracy between an anchor fixed to a support and a cap fixed to a beam extending in the horizontal direction. [Structure] The positioning of the cap 5 and the anchor 4 on the upper side of the cap 5 of the beam fall prevention device 1 is performed by a notch that is joined to the upper end of the anchor 4 in a positioning hole 8 provided in the ceiling material 7 of the cap 5. It is set by inserting the male screw 12 having the portion 11 and tightening the nut 14. Also, the cap 5 and the anchor 4 on the lower side of the cap 5
The positioning of and is set by inserting the anchor 4 into the insertion portion 16 of the rubber deformable member 15 mounted on the opening side of the cap 5. Since the formation of the positioning hole 8 of the ceiling material 7, the joining of the male screw 12 to the anchor 4, and the production of the deformable member 15 can be performed at low cost, the beam fall prevention device 1 having high positioning accuracy can be performed at low cost. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, when normal horizontal force such as temperature change, dry expansion / contraction, creep change, and load change acts on the beam (bridge or vertical beam), the horizontal force is changed by the relative displacement between the beam and the support. The present invention relates to a beam fall prevention device for preventing a beam from falling from a support when a horizontal force larger than a normal horizontal force acts on the beam by absorbing the beam.

[0002]

[Prior art]

 As a beam fall prevention device that absorbs the horizontal force applied to the beam within a predetermined range and regulates it when it exceeds the predetermined range, as shown in FIG. 4, an anchor 102 that is firmly fixed to a support body 101, There is known a beam fall prevention device 100 including a cap 104 fixed to a beam 103 while covering the anchor 102. As shown in FIG. 5, this beam drop prevention device 100 absorbs horizontal displacement by the distance L1 and L2 between the anchor 102 and the caps 104 on both sides of the anchor 102.

The following two techniques are known as techniques for positioning the cap 104 and the anchor 102 in the conventional beam fall prevention device 100. a) The first technique is used in FIG. 4, in which the opening of the cap 104 is directed upward, and a highly viscous filler 105, such as tar, which does not solidify for a long period of time, flows into the inside. Next, the anchor 102 is pierced in the filling material 105, the anchor 102 is positioned, and at the same time, the anchor 102 is mounted in the cap 104.

B) In the second technique, as shown in FIG. 6, the anchor 102 is positioned inside the cap 104, and the anchor 102 is pressed from the surroundings to hold the anchor 102. The rubber cylindrical body 106 for supporting the movably in the horizontal direction is inserted. Next, the anchor 102 is inserted into the rubber tubular body 106, and the anchor 102 is mounted in the cap 104.

[0005]

[Problems to be solved by the device]

 However, the above-mentioned two technologies have the following drawbacks, respectively. In the technique a) described above, the anchor 102 tilts in the filling material 105, so that the positioning accuracy of the anchor 102 in the cap 104 becomes low. Moreover, the filler 105 needs to have a low viscosity so that it can flow into the cap 104. That is, when the anchor 102 is attached to the cap 104, a facility for heating the filling material 105 is required, which requires a lot of work and also causes the filling material 105 to overflow from the cap 104 when the anchor 102 is inserted into the filling material 105. However, there were problems such as the construction site being dirty and making workers uncomfortable.

Further, in the technique of b) described above, since the tubular body 106 made of rubber is inserted over substantially the entire length of the cap 104, the tubular body 106 needs to be manufactured by die cutting. The technique of manufacturing a long rubber tubular body by die cutting has a drawback that the die cutting cannot be performed easily and productivity is poor. Further, since the tubular body 106 extends over the entire length of the cap 104, the material cost is increased and the weight is increased. As a result, it has been desired that the cost of the beam drop prevention device be increased and the weight thereof be increased to facilitate the handling.

[0007]

[The purpose of the device]

 The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive and lightweight beam fall prevention device with high positioning accuracy between an anchor and a cap.

[0008]

[Means for Solving the Problems]

 The beam fall prevention device of the present invention employs the following technical means. The beam drop prevention device according to claim 1 is a rod-shaped anchor fixed in a state in which it projects upward from a support that supports a beam extending in the horizontal direction from below, and a beam-like anchor in the state in which the periphery is filled with concrete. A fixed container-like cap that is fixed and accommodates the anchor in a horizontally movable state inside, and the relative displacement between the beam and the support within a predetermined amount in the horizontal direction. Is absorbed by the movement of the anchor in the cap, and the displacement of a predetermined amount or more in the horizontal direction is restricted by the contact of the anchor with the cap. The ceiling material of the cap is provided with a positioning hole that penetrates the ceiling material. Further, the upper end of the anchor is provided with a blocking means for blocking the upward movement of the anchor in the cap, and a nut is attached to a portion protruding from the positioning hole of the ceiling material, and the blocking is performed. Between the means and the anchor, an upper positioning male screw having a notch cut by the horizontal load of the beam is provided. Further, an insertion portion for inserting the anchor is provided on the opening side of the lower side of the cap, and the horizontal position of the anchor on the lower side of the cap is positioned by inserting the anchor through the insertion portion. A deformable deformable member is mounted.

According to a second aspect of the present invention, in the beam fall prevention device, the deformable member includes an anchor insertion portion through which the anchor is inserted, and an elastically deformable rubber including a punched hole in a horizontal direction of the anchor insertion portion. Provided by the material.

[0010]

[Function of the device]

 The beam fall prevention device of the present invention is assembled as follows. First, the deformable member is attached to the opening side of the cap. Next, the anchor is inserted into the insertion portion of the deformable member, and the male screw provided on the upper end of the anchor is projected from the positioning hole of the ceiling material of the cap. Next, tighten the nut on the male screw, sandwich the ceiling material of the cap between the blocking means and the nut, and position the cap on the upper side of the anchor. The deformable material may be attached to the opening portion of the cap after inserting the male screw and the nut and inserting the anchor attached to the cap. Then, when the anchor is fixed to the support part, the cap is fixed to the beam, and the horizontal force of the beam is applied to the anchor through the cap, the notch of the male screw is cut, and the anchor and the cap move horizontally. It can be moved by a predetermined amount.

[0011]

[Effect of device]

 In the beam fall prevention device of the present invention, the upper side of the cap is positioned using a male screw, and the lower side of the cap is positioned using a deformable member. And the positioning of both is highly accurate. Since the anchor is supported by the cap only on the upper side and the lower side of the cap, less material is used, so that the beam drop prevention device can be manufactured at low cost. In addition, since less material is used, the weight of the beam fall prevention device can be reduced and workability can be improved.

[0012]

【Example】

 Next, the beam fall prevention device of the present invention will be described based on an embodiment shown in the drawings. [Structure of First Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a sectional view showing a state in which a beam drop prevention device is attached to a beam and a support. The vertical direction used in the present invention is based on the direction in which the beam fall prevention device 1 is attached to the beam 2 and the support 3, and the horizontal direction indicates the expansion / contraction direction of the beam 2. Is.

The beam fall prevention device 1 is provided between a beam 2 made of prestressed concrete that extends in the horizontal direction and a support 3 that supports one end of the beam 2 from below. It has a rod-shaped anchor 4 fixed to the support body 3 in a state of being extended to and a cap 5 fixed below the end of the beam 2 in a state where the periphery is filled with concrete.

The cap 5 is made of a metal material or a resin material in the shape of a terrestrial vessel in which one end of a tubular body 6 having a rectangular cross section is closed by a ceiling material 7. The cap 5 is arranged in the horizontal direction of the tubular body 6 (see FIG. 1). , The left-right direction of FIG. 2) is set to a size obtained by adding the allowable slide width L1 of the beam 2 in the contraction direction, the diameter φ of the anchor 4 and the allowable slide width L2 of the beam 2 in the extension direction. ing. The allowable slide width L1 in the shrinking direction of the beam 2 is obtained by adding the temperature change amount Lt of the beam 2, the shrinkage amount Lε of the beam 2 due to drying, the shrinkage amount Lψ of the beam 2 due to creep, and the allowance amount 10 mm. (L1 = Lt + L.epsilon. + L.psi. + Margin amount). The allowable slide width L2 of the beam 2 in the extending direction is the sum of the temperature change amount Lt of the beam 2 and the allowance amount 10 mm (L2 = Lt + allowance amount). The ceiling material 7 of the cap 5 is provided with a positioning hole 8 penetrating therethrough. Then, the cap 5 is firmly fixed to the beam 2 in a state where the surrounding is filled with concrete.

The anchor 4 is a steel rod whose surface is rust-proofed by resin coating or galvanizing, and the lower part of the anchor 4 is firmly fixed in the hole 9 of the support 3 by using concrete 10. Fixed. A male screw 12 having a notch 11 in the middle is fixed to the upper end of the anchor 4. The male screw 12 is provided on the anchor 4 by first welding a nut 13 (a metal plate having a female screw formed inside) to the end of the anchor 4 and screwing the male screw 12 into the nut 13. It is a thing. A blocking nut 14a (blocking means of the present invention) for restricting the upward movement of the anchor 4 is attached to the upper end side of the notch 11 of the male screw 12. The male screw 12 on the upper side of the nut 14a is inserted into the positioning hole 8 provided in the ceiling material 7 of the cap 5, and then the nut 14 is tightened. By tightening the nut 14, the ceiling material 7 of the cap 5 is sandwiched between the nut 14a and the nut 14, the cap 5 and the anchor 4 are positioned on the upper side of the cap 5, and the cap 5 and the anchor 4 are positioned. We are joining with 4. The cutout 11 is provided so that the beam fall prevention device 1 is fixed to the support 3 and the beam 2 and then easily cut by the horizontal force applied to the beam 2.

A deforming member 15 made of an elastically deformable rubber material is attached to the opening below the cap 5. As shown in FIG. 2, the deformable member 15 includes an insertion portion 16 into which the anchor 4 is inserted, and a punched hole 17 in the insertion portion 16 in the horizontal direction. By inserting it, the anchor 4 is positioned at the horizontal position on the lower side of the cap 5 (the length between the anchor 4 and the cap 5 is L1 on one side and L2 on the other side), and The anchor 4 supports the cap 5 so that the anchor 4 can move in the horizontal direction. The deformable member 15 is formed by die cutting.

The beam fall prevention device 1 is assembled at another work place before being fixed to the beam 2 or the support body 3, and the assembled beam fall prevention device 1 is attached to the beam 2 or It is fixed to the support 3. Next, a procedure for assembling the beam drop prevention device 1 will be described. First, the deformable member 15 is attached to the open end of the cap 5. Next, the anchor 4 provided with the male screw 12 and the nut 14 a is inserted into the insertion portion 16 of the deformable member 15, and the end portion of the male screw 12 is projected from the positioning hole 8 of the ceiling material 7. Next, the nut 14 is tightened. As described above, the assembling of the beam fall prevention device 1 is completed.

[Effects of Embodiment] In the beam fall prevention device 1 of this embodiment, the upper side of the cap 5 is positioned using the male screw 12, and the lower side of the cap 5 uses the deformable member 15. Positioning is done. In addition, since high positioning accuracy can be obtained by positioning both of them, it is possible to provide the beam drop prevention device 1 with high accuracy. The process of joining the male screw 12 to the anchor 4, the process of forming the positioning hole 8 in the ceiling material 7 of the cap 5, and the process of forming the deformable member 15 are all possible at low cost, and as a result, The fall prevention device 1 can be manufactured at low cost.

Further, since the anchor 4 is fixed to the cap 5 with the male screw 12, the anchor 4 does not fall out of the cap 5 during the movement, and the anchor 4 does not tilt with respect to the cap 5. The beam fall prevention device 1 can be commercialized. Therefore, the workability at the work site is improved. Furthermore, since the amount of material used is small, the weight of the beam fall prevention device 1 can be reduced, and the workability can be improved.

Second Embodiment FIG. 3 is a sectional view of a beam drop prevention device 1 according to a second embodiment. The deformable member 15 of this embodiment is formed by stacking a plurality of rubber plates processed by punching and fixing them, and a mounting rubber plate 21 mounted around the cylindrical body 6 of the cap 5 and the mounting rubber plate 21. The positioning rubber plate 22 is joined to the mounting rubber plate 21 and positions the anchor 4. A metal collar 23 for attaching the mounting rubber plate 21 to the cap 5 is joined to the periphery of the cylindrical body 6 of this embodiment by a welding technique. According to this embodiment, since the deformable member 15 can be formed by punching, when changing the diameter of the anchor 4, changing the diameter of the cylindrical body 6, or changing the setting position of the anchor 4, the punching is performed. Since it can be dealt with only by changing the shape, the deformable member 15 can be formed at a lower cost than changing the shape of the deformable member 15 by die cutting.

[Modification] In the above embodiment, the deformable member 15 is made of an elastically deformable material. However, the anchor 4 may be movably provided in the cap 5 by plastic deformation. To give a concrete example, a soft resin or metal in which a long groove-shaped escape groove is formed in the horizontal direction of the insertion portion 16, or a strip-shaped metal thin plate formed in a substantially V shape with the insertion portion 16, or A resin plate or the like may be used. For the male screw 12 joined to the anchor 4, an example is shown in which the nut 13 is joined to the end of the anchor 4 and the male screw 12 is joined to the nut 13, but by joining the bolt to the end of the anchor 4, The male screw 12 may be joined to the anchor 4. Although the nut 14a is shown as an example of the blocking means, a collar-shaped metal member may be provided by welding to the male screw 12.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a beam drop prevention device (first embodiment).

FIG. 2 is a plan view of a deformable member (first embodiment).

FIG. 3 is a schematic cross-sectional view of a beam drop prevention device (second embodiment).

FIG. 4 is a schematic cross-sectional view of a state in which a beam drop prevention device is installed (first conventional technique).

5 is a cross-sectional view taken along the line AA of FIG. 4 (first conventional technology).

FIG. 6 is a cross-sectional view of a beam drop prevention device (second prior art).

[Explanation of symbols]

 1 Beam fall prevention device 2 Beam 3 Support 4 Anchor 5 Cap 7 Ceiling material 8 Positioning hole 11 Notch 12 Male screw 13 Nut 15 Deformation member 16 Insertion part

Claims (2)

[Scope of utility model registration request] 1. A rod-shaped anchor fixed to a support for supporting a beam extending in the horizontal direction from above from below, and a rod-shaped anchor fixed to the beam in a state where the periphery is filled with concrete. A cap in the shape of a container having a ceiling that accommodates the anchor so as to be horizontally movable inside the anchor, and the relative displacement between the beam and the support within a predetermined amount in the horizontal direction is caused by the anchor inside the cap. In the fall prevention device of the beam, which is absorbed by moving at, and regulates a horizontal displacement of a predetermined amount or more by the anchor contacting with the cap, the ceiling material of the cap penetrates the ceiling material. The upper end of the anchor is provided with blocking means for blocking upward movement of the anchor in the cap, and the ceiling is provided. A nut is attached to a portion of the material protruding from the positioning hole, and an upper positioning male screw having a notch cut by the horizontal load of the beam is provided between the blocking means and the anchor. An opening portion for inserting the anchor is provided on the lower opening side of the cap, and the anchor is inserted through the insertion portion to position the anchor in the horizontal position on the lower side of the cap. A beam fall prevention device comprising a deformable deformable member. 2. The deformable member is provided with an anchor insertion portion through which the anchor is inserted, and is provided by an elastically deformable rubber material having a punched hole in a horizontal direction of the anchor insertion portion. The beam fall prevention device according to claim 1.