JP6808673B2 - Cross joint for girder - Google Patents

Description

The present invention relates to a cross beam for girders installed at positions where girders erected in a well girder shape intersect with each other, and it is possible to join the girders erected in a well girder shape inside a retaining wall at the same level. It is possible and does not interfere with the preload method that introduces axial force to the girder prior to root cutting.

When constructing foundations and other underground structures, work is carried out to dig the ground to a size and depth equivalent to the scale of the underground structure to be constructed (hereinafter referred to as "root cutting work").

In the root cutting work, for example, as shown in FIG. 6, a mountain retaining wall 20 and a mountain retaining support 21 are temporarily installed inside the retaining wall 20 in order to prevent the collapse of earth and sand prior to the root cutting. It is temporarily installed by the abdomen 22, the cutting beam 23, the flint beam 24, etc., and the abdomen 22 is installed horizontally along each wall surface of the retaining wall 20.

Further, the girder 23 is erected inside the abdomen 22 in a grid shape, and the end portion of each girder 23 is joined to the side surface of the abdomen 22 facing the abdomen. Further, at the position where the cutting beams 23 intersect with each other, the cutting beams 23 are three-dimensionally intersected vertically and bound by the intersection piece 25 (see FIG. 7).

Further, near the position where the girders 23 intersect with each other, a support pile (shelf pile) 26 for preventing buckling of the girder 23 and receiving the weight of the girder 23 is installed (see FIG. 7).

In particular, when there is a risk that the retaining wall 20 will be significantly deformed on soft ground and it is necessary to prevent the surrounding ground from subsidence, the preload method (introducing axial force to the girder in advance with a hydraulic jack) is used. Axial force is introduced into the girder 23 to suppress deformation of the retaining wall 20 after excavation.

Jikkenhei 6-76444 Gazette Japanese Unexamined Patent Publication No. 2001-262560 Japanese Unexamined Patent Publication No. 05-148837

At the position where the girders 23 erected in the shape of a well girder intersect, the girders 23 are stacked one above the other and crossed three-dimensionally. It is necessary to change the height up and down.

Therefore, in order to join the ends of the adjacent raised 22 at the entrance and exit corners of the retaining wall 20, the ends of the raised 22 are stacked one above the other, and the corner piece 27 is used as a metal joint. (See Fig. 8), it is necessary to join with a plurality of joining bolts, and also to stack the flint beams 24 on top of each other and join each other with a plurality of joining bolts, so the number of joining bolts is particularly large and the joining work Was very troublesome (see Fig. 8).

Furthermore, when the axial force of the cutting beam 23, which is expected to be generated with the root cutting in the next stage, is introduced into the cutting beam 23 in advance (preload method), the intersection is at the position where the intersecting cutting beams 23 intersect. Preloading was very cumbersome as it was tied together by piece 25.

It should be noted that inventions relating to crossed joints for cutting beams for joining intersecting cutting beams at the same level are disclosed in Patent Document 1 (see FIG. 1) and Patent Documents 2 and 3 (see FIG. 2).

In particular, in the cross joint for a girder of Patent Document 1, the left and right ends of a rectangular parallelepiped (10) having a through hole (A) in the center of a side surface are formed in a pyramid trapezoidal tip.

Further, the pyramidal trapezoidal portions (20) at both ends are provided with insertion holes (B) so as to be orthogonal to the through holes (A) from the end faces on the same plane, and the tips of the insertion holes (B) are through holes. The side surface (A1) of A is a closed end surface. The size of the through hole (A) is set so that the length is the same as the height of the H-beam for cutting beams and the width is slightly larger than the width of the H-beam. The length and height of the insertion hole (B) are set to be the same as those of the H steel. Further, a rib (40) is provided as a reinforcing material.

However, as is clear from the figure, there is a step on the upper end surface of the crossing beam and the joint, which not only hinders the movement of the worker, but also covers the beam and the cover erected on the upper side of the beam. It was necessary to provide more space than necessary in anticipation of this step between the girders.

On the other hand, the crossed joints for girders disclosed in Patent Documents 2 and 3 are formed in a plane cross shape by integrating the joints for joining the end portions of the intersecting girders, and the end portions of the girders. Since the joints are bolted to each joint, the preload method cannot be applied to the girders in each direction, or it is very difficult to apply.

The present invention has been made to solve the above problems, and it is possible to intersect the girders erected in a grid shape inside the abdomen in the same plane, and to apply the preload method. It is an object of the present invention to provide a crossed joint for a cut beam.

The present invention is an invention of a cross joint for a girder in which girders erected inside a retaining wall in a grid shape are installed at positions where they intersect each other.
It is composed of a pair of joining beams that intersect at the same level, and an opening is provided on one side surface of the joining beam that penetrates in the direction perpendicular to the axis of the joining beam, and the opening is joined to the other. A concave groove portion through which the beam for cutting penetrates and the upper and lower frame portions of the opening are idle is provided on the upper and lower surfaces of the beam for joining the other beam, and the upper surface of the cross joint for the one and the other beam is provided. It is characterized by being formed flush with each other.

By forming the inner width of the opening wider than the beam width of the other joining girder and forming the groove width of the concave groove portion wider than the beam width of the one joining girder, each joint is formed. The beam for cutting can be displaced relative to each other in the horizontal beam axis direction and the direction perpendicular to the horizontal beam axis without being restrained by each other within the range of the inner width of the opening and the groove width of the concave groove portion, whereby the cutting for each joint can be performed. Axial force can be introduced to the girder in each direction joined via the beam by the preload method (the axial force is introduced to the girder in advance by the hydraulic jack). It is also possible to cross the beams diagonally.

Further, by forming the depth of the concave groove portion and the height (form) of the upper frame portion of the opening at the same level, the upper end surface of the joining beam can be made flush with the cutting beam. It is only necessary to provide the minimum necessary space, space, and gap between the lining girders erected on the upper side of the beam. In addition, it does not interfere with workers moving on the girder.

Further, the one and the other joining beams form an upper portion or a lower portion of the joining cutting beam with a horizontal plane passing through the axis of the joining cutting beam as a boundary, and the joining beams are connected to each other. By forming from a pair of joint half beams having concave grooves wider than the beam width of the joining beam at the intersecting positions, one joining beam having an opening and the other joining having a concave groove The girder can be easily manufactured (see Figures 3 and 4).

That is, by integrally joining a pair of half-beams for joints with both recessed grooves facing each other, one joint beam having an opening can be formed (Fig. 3 (a), (Fig. 3 (a),). (see b)), and by integrally joining the concave grooves toward the outside, it is possible to form the other joining beam having concave grooves on both the upper and lower sides (Fig. 4 (a), (b). )reference).

According to the present invention, an opening is provided on one side of a joining beam that intersects at the same level so as to penetrate in a direction perpendicular to the axis of the joining beam, and the other of the joining beams passes through the opening. By providing a concave groove portion that penetrates and allows the upper frame portion of the opening to play at the upper end portion of the other joining girder, the upper end portion of the joining girder that intersects at the same level is faced. This can be done to ensure the safety of workers moving on the girder.

Further, by forming the inner width of the opening wider than the beam width of the other joining girder and forming the groove width of the concave groove portion wider than the beam width of the one joining girder. Each joining beam can be displaced relative to each other in the horizontal beam axis direction and the horizontal beam axis perpendicular direction without being constrained to each other within the range of the inner width of the opening and the groove width of the concave groove portion, whereby each joint can be joined. Preloading (introducing axial force to the cutting beam in advance by a hydraulic jack) can be performed on the cutting beam joined via the cutting beam. It is also possible to cross the beams diagonally.

It is a perspective view of the crossing joint for a cutting beam installed at the position where the cutting beams erected in the shape of a well girder intersect. It is a perspective view of the cross joint for a girder. A crossed beam for one joint composed of a pair of half beams for a joint is shown. 3 (a) is a front view after assembly, and FIG. 3 (b) is a front view before assembly. The other crossing beam for a joint composed of a pair of half beams for a joint is illustrated. FIG. 4A is a front view after assembly, and FIG. 4B is a front view before assembly. It is a partial perspective view which shows the structure of the cross beam for a joint which constitutes the cross joint for a girder. It is a top view of the mountain retaining wall and the mountain retaining support temporarily installed inside the mountain retaining wall. It is a perspective view which shows the intersecting position of the girder temporarily constructed in the shape of a well girder. It is a perspective view which shows the entrance corner part of the retaining wall.

1 to 5 show an embodiment of the present invention. In the figure, cross beams 1 are erected in a girder shape (see FIG. 6) at intersecting positions of cross beams for cutting beams. 2 is installed, and the cutting beams 1 are joined to each other via the crossing joint 2 for the cutting beam.

Further, a support pile (shelf pile) 3 is erected on the side portion of the cross beam for cutting beam 2, and a plurality of cutting beams 1 joined to each other via the crossing joint 2 for cutting beam are attached to the bracket 4. It is supported through. H-shaped steel is used for the girder 1 and the support pile 3.

The cross beam for cutting beam 2 is formed in a substantially cross shape in a plane from a pair of cutting beams 5 for joining and a cutting beam 6 for joining that intersect each other at the same level (in the same plane).

The joining beams 5 and 6 are formed to have the same beam formation and the same beam width, and each of the cutting beams 1 is formed to have the same beam formation and the same beam width.

Further, the joining beam 5 and 6 are basically formed to have the same length, and an opening 7 penetrating horizontally is formed in the central portion of the joining beam 5 in the beam axial direction, and the opening 7 is formed. The central portion of the joining beam 6 penetrates horizontally.

Further, concave groove portions 8 and 8 are formed at the upper end portion and the lower end portion of the central portion of the joining beam 6 in the beam axial direction, and the upper and lower frame portions 7a and 7a of the opening 7 penetrate the concave groove portions 8 and 8. ing.

The opening 7 is formed in a rectangular shape having a long side in the beam axial direction of the joining beam 5, and its inner width L is formed to be slightly wider than the beam width of the joining beam 6.

Further, the concave groove portion 8 is formed in a rectangular shape having a long side in the beam axial direction of the joining beam 6, and the groove width W is slightly wider than the beam width of the joining beam 5 and substantially equal to the inner width L. It is formed to have the same width.

As a result, the joining beam 5 and the joining beam 6 are not constrained to each other within the range of the inner width L of the opening 7 and the groove width W of the concave groove portion 8, respectively, in the horizontal beam axial direction and the horizontal beam. It can be displaced relative to the axis perpendicular.

Further, the axial force is introduced by performing the preload method (introducing the axial force into the cutting beam in advance by the hydraulic jack) for the cutting beam 1 in each direction joined via the joining beam 5 and 6, respectively. It is also possible to cross the girders 1 at an angle.

Further, the depth S of the concave groove portion 8 is formed to have a depth substantially equal to the height (composition) of the upper and lower frame portions 7a of the opening 7, thereby above the joining beam 5 and the joining beam 6. Since the end faces are almost flush with each other, it is only necessary to provide the minimum necessary space between the girder 1 and the lining girder (not shown) erected above the girder 1, and also on the girder 1. It does not interfere with workers who move.

Further, the joining beam 5 and 6 are a pair of joints forming the upper portion and the lower portion of the joining beam 5 and 6 with the horizontal plane passing through the beam axis of the joining beam 5 and 6 as a boundary. It is formed by aligning half-beams 9 and 9 in the beam axial direction and integrally joining them by welding or joint bolts (see Figures 3 and 4).

The joint half beam 9 has a recessed groove portion 8 in which two pairs thereof form an opening 7 of the joining beam 5 and a recessed groove portion 8 of the joining beam 6 at an intermediate portion in the beam axial direction. In addition, it is integrally formed by assembling a plurality of plates while joining them by welding or the like.

In particular, a horizontal plate 9a and a vertical plate 9b are provided at least at positions corresponding to the upper and lower flanges 1a, 1a and the web 1b of the beam 1, and the ends of each beam 1 are joined to both ends in the beam axial direction. End plates 9c, 9c are attached (see, for example, Figures 2 and 5).

Then, the two joint half-beams 9 and 9 are paired, and the sides having the concave groove portions 8 are opposed to each other and aligned in the beam axial direction, and the joint beam 5 is joined by welding or a plurality of joint bolts. Is formed. Further, the opening 7 is formed by overlapping the concave groove portions 8 and 8 in the intermediate portion.

On the other hand, the joining half-beams 9 and 9 are joined together in the beam axial direction with the side having the concave groove portion 8 facing outward, and the joining cutting beam 6 is formed by welding or joining with a plurality of joining bolts. It is formed, and the concave groove portion 8 in the intermediate portion is a concave groove portion 8.

The cross-sectional shape of the joint half beam 9 is not limited to the shape shown in FIG.

In the present invention, the girders erected inside the retaining wall can be joined at the same level, and the preload method is applied to the girders in each direction prior to the root cutting. Axial force can also be introduced.

1 beam
1a Upper and lower flanges
1b Web 2 Cross joint for cutting beam 3 Support pile (shelf pile)
4 Bracket 5 Cutting beam for joining 6 Cutting beam for joining 7 Opening
7a Upper / lower frame part 8 Concave groove part 9 Half beam for joint
9a horizontal plate
9b vertical plate

Claims (3)

It is a cross beam for cutting beam installed at a position where the cutting beams intersect with each other, and is composed of a pair of cutting beams for joining that intersect at the same level, and the shaft of the cutting beam for joining is attached to one side surface of the cutting beam for joining. An opening that penetrates in the perpendicular direction is provided, and a concave groove portion is provided on the upper and lower surfaces of the other joining girder through which the other joining girder penetrates and the upper and lower frame portions of the opening are idle. A cross-beam crossing joint provided, wherein the upper surface of the one joining beam and the upper surface of the other joining beam are formed flush with each other. In the crossed beam for cutting beam according to claim 1, the inner width of the opening is formed wider than the beam width of the other cutting beam for joining, and the inner width of the concave groove portion is the joining of the one. A cross joint for a girder, which is characterized in that it is formed wider than the beam width of the girder. In the cross beam for cutting beam according to claim 1 or 2, the one and the other joining beam are the upper portion or the lower portion of the joining beam with a horizontal plane passing through the beam axis of the joining beam as a boundary. It is characterized in that it is formed of a pair of half-beams for joints, each of which has a side portion formed therein and has a concave groove portion wider than the beam width of the beam for joining at a position where the beam for joining intersects with each other. Crossed joint for girders.