JP3436928B2 - Steel web joining aid and steel web joining method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary tool used for welding and joining a steel web of a bridge girder having an upper floor slab and a lower floor slab made of concrete, and a steel web connecting them vertically, and a steel web of the bridge girder. The present invention relates to the joining method.

[0002]

2. Description of the Related Art Conventionally, it has been common practice to form bridge girders with concrete, particularly prestressed concrete. In a concrete bridge having a long span, the cross-sectional shape of the girder is usually box-shaped, and is composed of an upper floor slab, a lower floor slab, and a web connecting them. In the bridge girder constructed of such concrete, the web occupies about 10% to 30% of the girder weight, and the girder weight is considerably larger than that of the steel girder.

For this reason, it has been proposed to replace the concrete web with a steel web to reduce the weight of the girder. In Japanese Patent Laid-Open No. 7189425/1995, the web is made of a flat steel plate or a vertical bending line. Bridge girders using corrugated steel webs are disclosed. Bridge girders having such corrugated steel webs can reduce the girder weight and reduce the load on the foundation and substructure of the bridge, and can efficiently introduce prestress to the upper deck and lower deck. There is an advantage that you can. Further, it is possible to simplify the work such as assembling the web reinforcing bars and placing concrete, and it is possible to save the labor of the construction and shorten the construction period. Further, in a bridge girder provided with a corrugated steel web, the web has high shear buckling resistance, and there is also an effect of reducing the construction cost by omitting the reinforcing material.

The construction of a bridge girder having a steel web as described above is carried out by assembling a support work in the entire area to be erected, and then constructing it on the bridge girder by sequentially adding bridge girders to both sides from the pier to balance the fall moments to both sides. The cantilever erection method that extends the girder while taking the bridge, or the extrusion method that supports the bridge girder so that it can be moved on the bridge pier and moves the girders sequentially from the base end side is commonly used. There is.

When the bridge girder having the steel web is to be erected by such a construction method, the steel web is manufactured in a factory or the like, divided into a predetermined length in the axial direction of the girder, and carried into the erection site. And while joining these at the erection position,
The concrete of the upper floor slab and the lower floor slab is poured so as to be integrated with these steel webs. For joining the steel webs, a method is generally adopted in which the ends of the divided steel webs are overlapped and fillet welded.

[0006]

However, there are the following problems when welding and joining steel webs at the above-mentioned construction site. The ends of the divided steel webs are difficult to finish in a completely flat state, and have some distortion and warpage. Therefore, when the end portions of the steel webs to be joined are overlapped with each other, they do not completely adhere to each other,
There will be some gaps between the superposed steel webs.
Then, when fillet welding is performed between the end surface of one steel web and the side surface of the other steel web, if there is the above-mentioned gap, stress concentration occurs in the welded portion, or a defect occurs in the welded portion and the structure is formed. May be a weakness.

In order to solve such a problem, a through hole is formed in the superposed steel webs and the bolts are tightened, or a convex member is welded to one of the steel webs,
A method of pressing both steel webs using this member and a wedge has been considered.

However, all of these methods require additional processing on the steel webs to be joined, which increases the number of steps and may cause defects in the steel webs by welding additional members. is there.

The present invention has been made in view of the above circumstances, and an object thereof is to bring the steel webs to be joined into close contact with each other by a simple work and prevent the joined portion from becoming a structural weak point. That is.

[0010]

In order to solve the above problems, the invention according to claim 1 provides a bridge girder having an upper floor slab and a lower floor slab made of concrete, and a steel web connecting them vertically. An auxiliary tool that is used during erection and is used for welding and joining steel webs divided into a plurality of pieces and carried into the erection position to each other, and notches provided near the upper edge and the lower edge of the steel web. Two steel rods which are inserted through the portions or through holes and are arranged substantially perpendicular to the steel web, and the steel bars which are arranged substantially parallel to each other on both sides of the steel webs to be joined along the joining edges. Two reaction force receiving members that are connected to each other at two locations by a rod, and a steel web that is supported by the reaction force receiving members and that is overlapped with each other and is joined to each other can be advanced and retracted so as to pinch the vicinity of the joining edges from both sides. With the pressure member That there is provided a steel web joining assisting tool.

In this steel web joining aid, two reaction force receiving members arranged on both sides of the steel web are connected to each other by a steel rod. The pressing member is supported by these reaction force receiving members and presses the steel web so as to sandwich the side surfaces from both sides. Therefore, the superposed ends of the steel webs fit closely together. By performing fillet welding in such a state, it is possible to achieve defect-free joining and prevent structural weakness.

Further, since the two steel rods connecting the reaction force receiving members are inserted into the notches or through holes provided near the upper edge and the lower edge of the steel web, the two steel rods of the steel web are inserted. Even if the flange is joined to the upper edge and the lower edge, the reaction force receiving member can be easily connected. Furthermore, even if concrete slabs have already been formed along the upper and lower edges of the steel web, or the formwork for concrete placement has been assembled, the reaction force receiving members can be connected easily and securely. can do.

According to a second aspect of the invention, in the steel web joining aid according to the first aspect, the pressing member forms a pair with each of the two reaction force receiving members and separates the steel web. A plurality of nuts that are fixed or locked at opposing positions, and a plurality of rods that are respectively capable of advancing and retracting with respect to both side surfaces of the steel web that are respectively screwed into and joined to these nuts. Shall have.

In this steel web joining aid, the rod advances toward the side surfaces of the steel web from both sides by rotating the rod, and sandwiches the superposed steel webs from both sides. Therefore, the steel web can be reliably pressed with a simple structure, and a defect-free welded joint is possible.

The invention according to claim 3 is the steel web joining aid according to claim 1, wherein the pressing member is fixed to one of the two reaction force receiving members, and is attached to a side surface of the steel web. A bearing portion to be abutted, a nut fixed or locked to the other of the reaction force receiving member, screwed to the nut, at a position facing the bearing portion and the steel web, And a rod that can move back and forth with respect to the side surface of the steel web.

In this steel web joining aid, a bearing portion is fixed to one of the reaction force receiving members, and the bearing portion is brought into contact with one side surface of the steel web. Then, when the rod supported by the other reaction force receiving member advances toward the side surface of the steel web, the overlapped end portions of the steel webs are sandwiched between the bearing portion and the advanced rod. As a result, the ends of the steel webs to be joined are in close contact with each other, and good fillet welding is possible.

Further, the bearing portion is fixed to the reaction force receiving member, and by accurately setting the position thereof, it has a function as a ruler. Therefore, it is possible to press the steel web at a correct position, prevent the steel web from being bent or warped, and finish it in a correct shape.

In the invention according to claim 4, when the bridge girder having the upper floor slab and the lower floor slab made of concrete and the steel webs connecting them vertically is erected, the steel is divided into a plurality of pieces and carried into the erection position. A method of joining webs to each other, wherein a notch portion or a through hole is provided near the joining edge of the steel web, near the upper edge and the lower edge of the steel web, and the web is divided into a plurality of parts. The steel webs are placed in place by overlapping the edges of the steel web to be joined to each other, and two reaction forces are provided on both sides of the steel webs to be joined, substantially parallel to each other along the joining edges. A receiving member is arranged, a steel rod is inserted into the cutout portion or the through hole, and the reaction force receiving members are connected to each other near the upper edge and the lower edge of the steel web. The reaction force is applied to the Pressurized to pinching the vicinity of the junction edge of the steel web from both sides, in which the steel webs superimposed one another to provide a method of joining the steel web welded both while being pressed.

Even if the edges of the steel webs to be joined are installed so as to be superposed at a predetermined position, it is unavoidable that a gap is created between the two steel webs. However, in the above method, the reaction force receiving member is arranged on both sides of the steel web to be joined, the upper edge and the lower edge are connected with a steel rod, and the reaction force is applied to the reaction force receiving member to cause the steel to react. Pressure can be applied to pinch the web from both sides. The means for pressing the steel web may be provided with a member supported by the reaction force receiving member and capable of advancing and retreating with respect to the steel web, or a wedge or a jack that expands and contracts between the reaction force receiving member and the steel web. It may be sandwiched.

Further, since the steel rod connecting the reaction force receiving member is inserted into the notch or the through hole provided in the vicinity of the upper edge and the lower edge of the steel web, the upper edge and the lower edge of the steel web are inserted. Even if the flanges are joined along the edges, the two reaction force receiving members can be easily connected at a position close to the steel web. Also, when the concrete floor slabs are joined along the upper and lower edges of the steel web, the steel web is sandwiched by a simple operation even when the formwork for placing concrete is assembled. So that it can be pressurized.

According to a fifth aspect of the present invention, in the method for joining steel webs according to the fourth aspect, a reaction force is applied to the two reaction force receiving members to sandwich the steel webs to be superposed and joined. In the step of pressurizing so as to attach, a rod having a thread is screwed into a nut fixed or locked to each of the two reaction force receiving members facing each other across the steel web, The rotation of the rods causes the rods to advance toward both sides of the steel webs to be joined.

In this method, by rotating the rod and advancing to both side surfaces of the steel web, it is possible to easily sandwich the vicinity of the overlapped edges. And
Even if the steel web has some "distortion" or "warpage", it can be easily coped with, and the steel web can be sandwiched without causing a large stress.

According to a sixth aspect of the present invention, in the method for joining steel webs according to the fourth aspect, a reaction force is applied to the two reaction force receiving members to sandwich the steel webs to be joined by being superposed on each other. The step of pressurizing so as to apply is described in 2
A bearing portion fixed to one of the reaction force receiving members of the book is brought into contact with a side surface of the steel web, and a rod having a thread is screwed into a nut fixed or locked to the other side of the reaction force receiving member. Then, by rotating the rod, the rod is advanced to the side surface of the steel web to be joined.

In this method, the bearing portion fixed to the reaction force receiving member is brought into contact with the surface of one side of the steel web to be joined and pressed by the rod from the opposite side, so that the steel web is sandwiched at an accurate position. It can be applied and can prevent "distortion" and "warping" from occurring in the steel web.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cut surface of a bridge girder having a corrugated steel web and its peripheral portion. Application of the steel web joining method according to the present invention or a steel web using a steel web joining aid according to the present invention It is an example of a bridge girder that can be joined. Further, FIG. 2 is a partial sectional view of the same bridge girder. This bridge girder is mainly composed of an upper floor slab 11 and a lower floor slab 12 made of prestressed concrete, and a steel web 13 in which a steel plate material is bent in a corrugated form, and is divided into a predetermined length in the bridge axial direction. It is constructed by joining corrugated steel plate materials and sequentially placing concrete of the upper floor slab 11 and the lower floor slab 12 in this portion.

The prestress in the bridge axis direction of the bridge girder is mainly introduced by the tensile force of the cable (not shown) stretched inside the box-shaped cross section, and if necessary,
A tension member is arranged inside the concrete of the upper floor slab 11 and the lower floor slab 12, and prestress is introduced by the tension of the tension member. Moreover, in the concrete of the upper floor slab 11,
Tensile members are embedded at predetermined intervals in a direction perpendicular to the axis of the bridge girder, and prestress is introduced so as to withstand the wheel load acting on the bridge surface.

The steel web 13 is formed by bending a steel plate material along a bending line perpendicular to the axis of the bridge girder to form a corrugated shape as shown in FIG. 2 (b). This steel web 1
As shown in FIG. 2 (a), flanges 14 and 15 are joined to the upper edge and the lower edge of No. 3 by welding, and a large number of stud dowels 16 are provided on the upper surface of the upper flange 14 and the lower surface of the lower flange 15. It is fixed. The concrete of the upper floor slab 11 and the lower floor slab 12 is placed so as to embed the stud dowel 16, and is closely integrated with the upper and lower flanges 14 and 15.

As shown in FIG. 3, the joining portion of the steel webs 13 divided into the bridge girder axial direction and carried into the erection site is near the end edges 13 of the two steel webs 13a and 13b to be joined.
c and 13d are overlapped with each other, and fillet weld 17 is applied between the end surface of one steel web and the side surface of the other steel web. On the other hand, the upper and lower flanges 14 and 15 welded to the two steel webs to be joined are arranged so as to abut each other with a gap, and are left unjoined and separated from each other. And the flanges 14, 15 of the steel web 13
A notch having a shape in which the edge recedes is provided in the vicinity of the joint portion with and the opening portions 18 are formed above and below the edge vicinity 13c and 13d of the superposed steel webs.

A steel web joining method and a steel web joining aid according to one embodiment of the present invention join a steel web by utilizing the above-mentioned opening portion. Next, regarding this method and joining aid explain.

The steel web 13 is processed into a corrugated body having a predetermined length, and is transported to the erection position with the upper and lower flanges 14 and 15 joined together. Then, as shown in FIG. 4, the steel webs 13a to be joined are arranged in the axial direction of the bridge girder, and as shown in FIG. 3, the steel webs 13a and 13d are supported in a state in which the edges 13c and 13d of the steel webs are overlapped with each other. At this time, some gaps are formed between the facing surfaces of the superposed steel webs, and in order to eliminate the gaps, both steel webs are pressed against each other using a steel web joining aid.

As shown in FIG. 5, the steel web joining aid has two reaction force receiving members 21 and 22 on the outer side and the inner side of the steel web 13 along the edges to be joined. The lower ends are connected to each other by steel rods 23 and 24. The steel rods 23 and 24 are inserted into opening portions 18 (see FIG. 3) formed near the upper edge and the lower edge of the overlapped portions of the steel webs 13.

As shown in FIGS. 6A and 6B, each of the reaction force receiving members 21 and 22 has two channel steels 21.
a, 21b, 22a, 22b are arranged back to back, the steel rods 23, 24 are inserted between them,
It is locked to both channel steels by a nut 25.

A pressure member 26 for pressing the steel web from both sides is attached to the reaction force receiving members 21 and 22. The pressing member 26 is engaged with the locking member 27 mounted so as to surround the two channel steels, a nut 28 joined to the steel web 13 side of the locking member 27, and screwed to the nut 28. A rod 29, a handle 30 attached to the rear end of the rod 29, and a pressure bearing plate 31 attached to the tip of the rod 29.

The locking member 27 includes the reaction force receiving member 21,
It is possible to move along the axis of the grooved steel forming the groove 22, and it is possible to support the grooved steel at an appropriate position by a pin inserted into the small hole row 32 provided in the grooved steel. ing. Further, the pressure support plate 31 is rotatably connected to the rod 29, and the rod 29 can freely rotate even if it is brought into contact with the side surface of the steel web 13 and is pressed. ing.

The same number of such pressure members 26 are mounted on both reaction force receiving members 21 and 22 and are supported at opposite positions on both sides of the steel web.

When the steel web joining aid having the above-described structure is used, the rod 29 and the bearing plate 31 are moved to the steel web 1 by operating the handle 30 to rotate the rod 29.
The steel web 13 is abutted on both side surfaces so as to sandwich the steel web 13. And further rod 2
By rotating 9, both reaction force receiving members 21, 2
The reaction force can be applied to 2 and the vicinity of the joined end edges of the steel web 13 can be strongly pressed. As a result, the superposed steel webs 13 closely contact each other,
By performing fillet welding in this state, it is possible to prevent defects from occurring at the joint.

Next, a steel web joining aid according to another embodiment of the present invention will be described with reference to FIG. This steel web joining aid is provided with two reaction force receiving members 41 and 42, which are inserted into the cutout portions of the steel web 13.
The point that they are connected by the steel rods 43 and 44 of the book is the same as the auxiliary tool shown in FIGS. 5 and 6. However, the pressure member 4
6 is attached only to one reaction force receiving member 42, and a bearing portion 51 is fixed to the other reaction force receiving member 41. The bearing portion 51 is formed by the columnar member 5 fixed to the channel steel.
The bearing plate 53 is attached to the tip of the bearing 2, and the position of the bearing plate 53 is accurately determined.

Therefore, the surface of the bearing plate 53 is brought into contact with the steel web 13, and the bearing plate 45 of the pressing member is brought into contact with and pressed against the opposite surface, whereby the superposed steel webs 13 are strongly pressed. The bearing plate 51 on the fixed side functions as a ruler, and the accurate shape of the steel web 13 can be maintained.

[0039]

As described above, in the steel web joining aid according to the present invention, the overlapped portions of the steel webs to be joined can be strongly pressed with a simple structure, and weld joining without defects can be performed. You can Further, in the method for joining steel webs according to the present invention, the steel webs divided and carried into the erection site can be joined by a simple operation without causing defects.

[Brief description of drawings]

FIG. 1 is a perspective view of a bridge girder having a corrugated steel web.

FIG. 2 is a partial cross-sectional view of the bridge girder shown in FIG.

3 is a side view and a sectional view showing a joint portion of the steel web of the bridge girder shown in FIG. 1. FIG.

FIG. 4 is a schematic perspective view showing a state in which the steel webs of the bridge girder shown in FIG. 1 are joined.

FIG. 5 is a cross-sectional view showing a steel web joining aid which is an embodiment of the present invention.

6 is a side view and a sectional view of the steel web joining aid shown in FIG. 5. FIG.

FIG. 7 is a cross-sectional view showing a steel web joining aid which is another embodiment of the present invention.

[Explanation of symbols]

11 Upper deck 12 Underfloor version 13 Steel web 14 Upper flange 15 Lower flange 16 Stud Gibel 17 fillet welding 18 Opening part 21, 22, 41, 42 Reaction force receiving member 23,24,43,44 steel rod 25 nuts 26,46 Pressure member 27 Locking member 28 nuts 29 rod 30 handles 31,45 bearing plate 32 small holes 51 bearing 52 Columnar member 53 bearing plate

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Kawakami 13th Araki-cho, Shinjuku-ku, Tokyo Livebest Building 2F Yotsuya Engineering Co., Ltd. (56) Reference JP-A-10-266136 (JP, A) JP 2000-17613 (JP, A) JP-A-11-323835 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01D 2/00-2/04 E01D 21/00

Claims (6)

(57) [Claims] 1. A steel web used for erection of a bridge girder having an upper floor slab and a lower floor slab made of concrete and steel webs connecting these vertically and welded together into a plurality of divided steel webs carried into the erection position. An auxiliary tool used for cutting the steel web, which is inserted into cutouts or through holes provided in the vicinity of the upper edge and the lower edge of the steel web, and is arranged substantially perpendicular to the steel web. A steel rod, two reaction force receiving members which are arranged substantially parallel to each other on both sides of the steel web to be joined along a joining edge, and which are connected to each other at two places by the steel rod; A steel web joining aid, comprising: a pressing member that is supported by a member and is capable of advancing and retracting so as to sandwich the joining edge edges of the steel webs to be joined by being superposed on each other from both sides. 2. The pressing member comprises a plurality of nuts fixed to or engaged with two reaction force receiving members at positions facing each other across the steel web as a pair, and these nuts. 2. A plurality of rods, each of which is capable of advancing and retreating, with respect to both side surfaces of the steel web screwed together and joined to each other.
The steel web joining aid described in. 3. The pressure member is fixed to one of the two reaction force receiving members and is fixed to the other side of the reaction force receiving member and a bearing portion abutting on the side surface of the steel web. It has a locked nut and a rod screwed to the nut and capable of advancing and retracting with respect to the side surface of the steel web at a position facing the bearing portion with the steel web in between. Claim 1
The steel web joining aid described in. 4. A method of joining steel webs, which are divided into a plurality of pieces and carried into an erection position, at the time of erection of a bridge girder having an upper floor slab and a lower floor slab made of concrete and steel webs connecting them vertically. In the vicinity of the joining edge of the steel web, a notch portion or a through hole is provided near the upper edge and the lower edge of the steel web, and a plurality of divided steel webs are joined together. The steel webs are placed at predetermined positions by superimposing the edges near each other, and two reaction force receiving members are arranged substantially parallel to each other on both sides of the steel webs to be joined, A steel rod is inserted through the notch or the through hole, the reaction force receiving members are connected to each other near the upper edge and the lower edge of the steel web, and a reaction force is applied to the two reaction force receiving members. , With joining edges of steel webs that are joined to each other on top of each other Pressurized to pinching from both sides, the bonding method of the steel web, wherein a steel web superimposed to each other welded both while being pressed. 5. The method for joining steel webs according to claim 4, wherein a reaction force is applied to the two reaction force receiving members, and a pressure is applied so as to sandwich the steel webs to be joined by being superposed on each other. Is obtained by screwing rods each having a thread on nuts fixed or locked to the two reaction force receiving members facing each other with the steel webs in between, and rotating the rods. A method for joining steel webs, characterized in that the rod is advanced to both side surfaces of the steel webs to be joined. 6. The method for joining steel webs according to claim 4, wherein a reaction force is applied to the two reaction force receiving members to press the steel webs that are superposed on each other and are joined together. Is a bearing portion fixed to one of the two reaction force receiving members,
Of the steel web to be joined by abutting the side surface of the steel web, screwing a rod having a thread to a nut fixed or locked to the other side of the reaction force receiving member, and rotating the rod. A method for joining steel webs, characterized in that the rod is advanced to both sides.