JP2004245035A - Underground beam construction frame and underground beam construction method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save labor and time to considerably shorten a construction period while sharply reducing cost. <P>SOLUTION: This underground beam construction frame 1 is composed of a frame body 7 and reinforcement arrangement 8 provided inside. The frame body 7 comprises a pair of steel plates 2, 2 having prescribed length and U-shaped axial section, and square angles 3, 3 welded to both end parts in the lengthwise direction of the steel plates 2, 2. The pair of steel plates 2, 2 are arranged parallel with the open sides facing with a fixed space. The square angles 3, 3 are provided with holes 5 for inserting through connecting bolts 4 for connection to adjacent underground beam construction frames. The frame 1 is installed on concrete and freshly mixed concrete is placed in the frame body 7 for hardening. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an underground beam construction frame and an underground beam construction method using the same.

The conventional construction method of underground beams is as follows. First, as shown in FIG. 7, the excavated portion 100 is excavated to perform excavation work. Next, as shown in FIG. 8, a split chestnut work is performed in which the rockstone 101 and the like are spread over the bottom of the excavated portion 100 and crushed. Next, as shown in FIG. 9, abandoned concrete 102 is thinly cast, and the positions of the underground beams and the like are marked with black ink.
Next, as shown in FIG. This is performed by forming a large number of reinforcing bars 103, 103,. In addition, 104, 104 is a stand such as a concrete block laid under the reinforcing bars 103, 103,....
Next, formwork is performed as shown in FIG. This is to assemble a formwork 105 made of a plate material so as to surround the reinforcing bars. Next, though not shown, ready-mixed concrete is poured into the formwork 105, and after the ready-mixed concrete has hardened, the formwork 105 is dismantled and then backfilled.

  However, in this conventional construction method, since the reinforcing bar and the formwork are assembled manually at the site as described above, a large amount of labor and time are required for the work. Further, since the conventional formwork has to be dismantled, the work has to be usually rested for one to two days until the poured ready-mixed concrete hardens, and the work efficiency is poor. The mold must be dismantled before backfilling, which requires extra effort and time. For these reasons, the conventional construction method wastes a great deal of labor and time, and also has a low work efficiency. Therefore, there is a problem that the construction period is prolonged and the cost is high.

  The present invention has been made in view of the above points, and has an underground beam capable of significantly reducing the construction period and the cost significantly in the construction of an underground beam as compared with the related art. A construction frame and an underground beam construction method using the same are provided.

  The gist of the present invention resides in that two steel plates having a U-shaped cross section are arranged in parallel at a predetermined interval, and a rectangular angle provided with through holes for connecting bolts is fitted to both ends of the steel plates. This is an underground beam construction frame that constitutes a main body, and has an appropriate arrangement of reinforcing bars inside the frame main body.

  In addition, the gist of the present invention is to bend the middle part of the underground beam construction frame, attach a connecting plate to which an anchor bolt is fixed inside the middle part, and, on the surface of the upper part of the middle part, This is an underground beam construction frame in which a base plate on which columns are erected is arranged, and the base plate and the connection plate are fixed to the frame body with anchor bolts.

  In addition, the gist of the present invention is to bend the middle part of the underground beam construction frame, fix the upper support plate of the pillar on the upper part of the middle part, and fix the lower support plate on the lower part. An underground beam construction frame fixed to the frame body by fixing columns to the upper support plate and the lower support plate.

  Further, the gist of the present invention is that an underground beam construction frame with an angle removed at one end is attached to an intermediate portion of the underground beam construction frame, and a connecting plate in which anchor bolts are fixed inside the intermediate portion. An underground beam construction frame in which a base plate on which a pillar is erected on the surface is arranged, and the base plate and the connection plate are fixed to a frame body with anchor bolts, while being attached.

  Further, the gist of the present invention is that an underground beam construction frame from which an angle is removed at one end is attached to an intermediate portion of the underground beam construction frame, and an upper support plate of a pillar is fixed to an upper portion of the intermediate portion. At the same time, the underground beam construction frame is fixed to the frame body by fixing a lower support plate to a lower portion and fixing columns to the upper support plate and the lower support plate.

  The gist of the present invention is that two steel plates having a U-shaped cross section are formed, and the steel plates are opposed to each other and arranged in parallel at a constant interval. A rectangular body with a hole is fitted to form a frame body, after which appropriate reinforcement is provided in the frame body, and then placed on concrete, and then ready-mixed concrete is poured into the frame body and hardened. Underground beam construction method.

According to the underground beam construction frame described in claim 1 to claim 5 and the underground beam construction method described in claim 6, as in the above-mentioned conventional construction method, work for assembling a reinforcing bar at a site and assembling a formwork. The work and the work of dismantling the formwork can be omitted. Further, the underground beam construction frame is completed in a state where concrete is poured into a steel plate frame arranged at regular intervals and hardened. Therefore, this completed state can be immediately used as a permanent structure on a highway, a pier or the like.
Also, the backfill can be performed immediately after placing the ready-mixed concrete in the formwork or even before placing the ready-mixed concrete.
Therefore, a great deal of labor and time are not wasted as in the related art, and the construction period can be greatly reduced in the underground beam construction work, and the cost can be significantly reduced. According to the underground beam construction frame of the second to fifth aspects, the underground beam construction frame and the column of the present invention can be quickly fixed on the site.

  The best mode for carrying out the underground beam construction frame according to the present invention is to arrange a pair of steel plates having a U-shape in cross section, facing the open side at a constant interval, and arranging them in parallel at the same height, The frame body is formed by fitting a rectangular angle having connection bolt insertion holes at required locations at both ends in the length direction of the steel plate to form a frame main body, and providing appropriate reinforcing bars inside the frame main body.

  In addition, the best mode for carrying out the underground beam construction method according to the present invention is to form a pair of steel plates having a U-shape in axial section, face the open sides of the steel plates at a constant interval, and After arranging in parallel at the height, the frame body is constructed by fitting a square angle with connecting bolt insertion holes at required locations at both ends in the length direction of this steel sheet, and then appropriately inside this frame body And then placing it on concrete and then pouring and hardening fresh concrete.

Hereinafter, examples of the present invention will be described.
FIG. 1 is a perspective view of an underground beam construction frame according to the present invention, FIG. 2 is an explanatory view of an underground beam construction method using the underground beam construction frame shown in FIG. 1, and FIG. FIG. 4 is a perspective view of an underground beam construction frame used for a part for fixing a column, and FIG. 5 is an explanatory view of an underground beam construction frame and a column fixing structure using anchor bolts. 6 is an explanatory view of a structure for fixing an underground beam construction frame and a column by welding.

  In the figure, reference numeral 1 denotes an underground beam construction frame. This underground beam construction frame 1 is composed of a frame body described later and reinforcing bars. Reference numerals 2 and 2 denote a pair of steel plates having the same size and the same shape, each having a predetermined length, and having the upper end and the lower end bent in the same direction, so that the shaft cross section has a U-shape. ing. The steel plates 2 and 2 are arranged in parallel with a fixed interval L with their open sides facing each other, and are installed such that the upper ends of both steel plates 2 are horizontal.

  Numerals 3 and 3 are rectangular angles made of steel plates, which are fitted and welded to the longitudinal ends of the pair of steel plates 2 and 2, respectively. In the present embodiment, the angles 3 and 3 have an L-shaped axial cross section in order to provide an overall strength and in terms of a fixed strength. The angles 3, 3 have holes 5, 5,... For inserting connection bolts 4 for connecting to the adjacent underground beam construction frame 1 at required places. Reference numeral 6 denotes a tightening nut that is screwed to the connection bolt 4.

  The frame body 7 is constituted by the pair of steel plates 2 and 2 and the rectangular angles 3 and 3. The height and width of the frame body 7 are appropriately determined according to the underground beam to be constructed using the frame body 7.

  Reference numeral 8 denotes reinforcing bars provided in the frame main body 7. Reinforcing bars 8 a, 8 a... Extending along the length direction of the frame main body 7, and reinforcing bars 8 b arranged perpendicularly to the length direction of the frame main body 7. .. And the reinforcing bars 8c, 8c,...

Next, an underground beam construction method using the underground beam construction frame 1 will be described with reference to FIG.
Excavation work, split chestnut work, abandoned concrete work, and blackout are the same as in the conventional construction method. According to this construction method, the underground beam construction frame 1 previously manufactured in a factory is disposed on discarded concrete, and then ready-mixed concrete (not shown) is poured into the frame body 7 and hardened.
As a result, the work of assembling the reinforcing bar and the work of assembling the formwork at the site, which has been conventionally performed, can be omitted, and unnecessary labor and time can be saved, and the work efficiency can be improved.
Since the underground beam construction frame 1 forms the underground beam as it is, there is no need to disassemble it as in the prior art. Therefore, it is not necessary to wait until the ready-mixed concrete is hardened as in the related art, and it is possible to refill immediately after placing the ready-mixed concrete or even before placing the ready-mixed concrete.
From these facts, the labor and time required for dismantling the form can be saved, the construction period can be greatly reduced, and the cost can be significantly reduced.
Reference numerals 9 and 9 denote members used for placing the underground beam construction frame 1 on discarded concrete, and in this embodiment, discard the L-shaped steel plates 10 and 10 fixed to the lower side of the frame body 7. A level adjusting bolt 11, 11 fixed to concrete is used.

  Next, when the underground beam is constructed using the underground beam construction frame according to the present invention, the pillars are fixed at corners, intersections of beams, and the like. It is desirable to use the underground beam construction frame, whereby the fixing can be performed quickly.

FIG. 3 shows the case where the column is fixed at the corner portion, that is, the intermediate portion 1a where the underground beam construction frame 1 is bent at a right angle, and FIG. 4 shows the case where the column is fixed at the intermediate portion 1b where the beam intersects. It is.
In these cases, when fixing the column in the intermediate portion 1a shown in FIG. 3, the underground beam construction frame 1 is formed in a plane L shape. When fixing the column at the intermediate portion 1b where the beams intersect as shown in FIG. 4, the underground beam construction frame 1 is formed in a flat T-shape, and one underground beam construction frame 2n is formed at an angle at one end. Can be removed and attached to another underground beam construction frame.

Then, as shown in FIG. 5, a connecting plate 13 to which anchor bolts 12, 12,... Are fixed is fixed to a predetermined position on the upper side of the frame body 7, and an anchor bolt provided on a base plate 15 having pillars 14 standing on the surface. The anchor bolts 12, 12,... Are inserted through the insertion holes 16, 16,... And tightened and fixed by nuts 17, 17,.
4 are bolt insertion holes provided in the frame body 7, 13a, 13a... Are anchor bolt insertion holes provided in the connecting plate 13, and the anchor bolts 12, 12. The bolts 13a are welded to the connecting plate 13 at a factory in advance with the bolts 13a being inserted into the holes 13a. Reference numeral 13b denotes a ready-mixed concrete filling hole provided at the center of the connecting plate 13.
Since other configurations are the same as those of the underground beam construction frame 1, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Next, a case where the pillar is fixed to the intermediate portion 1a shown in FIG. 3 and the intermediate portion 1b shown in FIG. 4 will be described with reference to FIG.
In the case of the present embodiment, the upper support plate 19 and the lower support plate 20 are fixed to the lower end of the column 18 by welding, and the column 18 is arranged vertically at the column fixing position in the frame body 7 and the two plates are fixed. Are fixed to the upper and lower portions of the frame body 7 by welding. Further, the column body 18A is fixed to the column 18 by welding a column main body 18A.
Since other configurations are the same as those of the underground beam construction frame 1, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

The perspective view of the underground beam construction frame according to the present invention Explanatory drawing of the underground beam construction method using the underground beam construction frame shown in FIG. Perspective view of an underground beam construction frame used for fixing columns Perspective view of an underground beam construction frame used for fixing columns Illustration of fixing structure of underground beam construction frame and column using anchor bolt Explanatory drawing of underground beam construction frame and column fixing structure by welding It is explanatory drawing of the conventional underground beam construction method, and shows the state excavated. It is explanatory drawing of the conventional underground beam construction method, and shows a split chestnut work. It is explanatory drawing of the conventional underground beam construction method, and shows the state in which discarded concrete is cast. It is explanatory drawing of the conventional underground beam construction method, and shows the state which arranged the reinforcement. It is explanatory drawing of the conventional underground beam construction method, and shows the state which assembled the formwork.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Underground beam construction frame 1a Middle part of underground beam construction frame 1b Intersection of underground beam construction frame 2n Underground beam construction frame 2 Steel plate 3 Angle 4 Connecting bolt 5 Bolt insertion hole 6 Nut 7 Frame body 8 Reinforcement 12 Anchor bolt 13 Connecting plate 13a Anchor bolt insertion hole 14 pillar 15 base plate 16 anchor bolt insertion hole 17 nut 18 pillar 19 upper support plate 20 lower support plate

Claims (6)

  Two steel plates having a U-shaped cross section are arranged in parallel at a constant interval, and a square angle provided with a through hole for a connecting bolt is fitted to both ends of the steel plate to form a frame body. Underground beam construction frame with appropriate reinforcement.   Bending the middle part of the underground beam construction frame, attaching a connecting plate to which an anchor bolt is fixed inside the middle part, and disposing a base plate with a pillar standing on the surface above the middle part, The underground beam construction frame according to claim 1, wherein the base plate and the connection plate are fixed to the frame body with anchor bolts.   The middle part of the underground beam construction frame is bent, and the upper support plate of the pillar is fixed to the upper part of the middle part, and the lower support plate is fixed to the lower part. The underground beam construction frame according to claim 1, wherein the underground beam construction frame is fixed to the frame body by being fixed to the frame body.   At the middle part of the underground beam construction frame, an underground beam construction frame from which an angle was removed at one end was attached, and a connecting plate to which an anchor bolt was fixed was attached inside the middle part. 2. The underground beam construction frame according to claim 1, wherein a base plate having columns erected thereon is disposed, and the base plate and the connecting plate are fixed to the frame body with anchor bolts.   Attach the underground beam construction frame with one end angle removed to the middle part of the underground beam construction frame, fix the upper support plate of the column on the upper part of the middle part, and fix the lower support plate at the lower part The underground beam construction frame according to claim 1, wherein the pillar is fixed to the frame body by fixing the column to the upper support plate and the lower support plate.   Two steel plates having a U-shaped cross section are formed, and the steel plates are opposed to each other and arranged in parallel at a constant interval. Then, a square angle having connection holes for connecting bolts provided at both ends of the steel plates is fitted. An underground beam construction method in which the main body is constructed, the appropriate reinforcement is applied to the inside of the frame body, and then the concrete body is installed on concrete. Then, the fresh concrete is poured into the frame body and hardened.

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