JPH0687435U - Underground beam main support stand - Google Patents

Abstract

(57) [Summary] [Purpose] Along with the fact that ready-mixed concrete wraps around inside and solidifies, preventing cross-section loss of the beam and improving strength, and securely fixing the inner height adjustment pipe to rebar. The present invention provides an underground beam main bar receiving stand that prevents the sinking due to the weight of the ground and improves the bar arrangement accuracy. [Construction] A guide in which two L-shaped members 21 and 21 are arranged in a square shape on the upper portion of a base plate 2 and gaps 22 and 22 are provided between the ends of the adjacent L-shaped members 21 and 21. A tube 23 is erected, a height adjusting pipe 4 is vertically movably inserted inside the tube 23, and a rectangular pipe 7 through which a reinforcing bar 6 is inserted is joined to the upper end of the pipe 4 in a T-shape in the lateral direction. On the lower end side of the height adjustment pipe 4,
A stopper bolt 29, which penetrates the gaps 22, 22 facing each other of the guide cylinder 23, is attached, and both ends L of the bolt 29
It is characterized in that L-shaped pressing fittings 30, 30 which are in contact with the outer surfaces of the shape members 21, 21 are attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the improvement of the receiving stand that supports the main reinforcement of the underground beam in the reinforcing bar foundation work.

[0002]

[Prior art]

 Generally, when constructing an underground beam, first the basic rebar is assembled, but conventionally, the basic rebar assembly work is performed using the underground beam main bar receiving stand 1 which does not require a scaffold for assembly as shown in FIG. Was there. In this structure, a guide pipe 3 formed of a square pipe is erected on a base plate 2, and a height adjusting pipe 4 also formed of a square pipe is inserted inside the guide pipe 3 so as to be vertically movable, and the outer pipe The height of the inner height adjusting pipe 4 is fixed by a bolt 5 attached to the side surface of the guide pipe 3 so that the height can be adjusted to any height. At the upper end of the inner height adjusting pipe 4, a square pipe 7 penetrating a reinforcing bar 6 according to the beam width is laterally joined in a T shape, and the reinforcing bar 6 is fixed to the bottom surface of the rectangular pipe 7. The bolt 8 is attached.

As shown in FIG. 7, the underground beam main bar receiving stand 1 having the above structure has a base anchor 13 by placing a crushed stone 11 at the bottom of a groove 10 dug in the ground and then placing a discarded concrete 12 therein. To bury. Then, the underground beam main bar receiving stands 1 ... Are arranged at a predetermined interval along the longitudinal direction of the groove 10 on the discarded concrete 12, and the base anchor 13 is fixed to the base plate 2 with the nut 14. After this, on the reinforcing bar 6 that penetrates the horizontal square pipe 7, the main reinforcements 15 above the underground beam are placed at intervals in the lateral direction, and the square hoop reinforcement 16 is mounted on this, and the hoop reinforcement is further placed. Place the bottom girder main reinforcement 17 on the lower part of 16 and tie it with wire to assemble the reinforcing bar. After that, the formwork was assembled, and then ready-mixed concrete was poured to construct the underground beam.

However, in the conventional underground beam main bar receiving stand 1, a height adjusting pipe 4 is vertically movably inserted inside an outer guide pipe 3 which is formed of a square pipe, so that the supporting height of the reinforcing bar is increased. Since the height is adjusted, the hollow portion formed inside the guide pipe 3 and the height adjusting pipe 4 is in a sealed state. For this reason, there was a problem that the ready-mixed concrete did not flow into the inside of the hollow part, and the cross-section was lost at this part, reducing the strength of the beam. Also, since the inner height adjusting pipe 4 is fixed by tightening it from the side with bolts 5, the contact area is small, and the weight of the reinforcing bar to be supported becomes heavy. There was also a problem that 4 was lowered due to weight and the rebar sank, resulting in poor rebar accuracy.

[0005]

[Problems to be solved by the device]

 The present invention eliminates the above-mentioned defects and prevents the beam cross section from being broken by improving the strength of the concrete by sneaking into the inside of the ready-mixed concrete and solidly fixing the inner height adjustment pipe. The purpose of the present invention is to provide an underground beam main bar support stand that prevents sinking due to the weight of the reinforcing bar and improves the bar arrangement accuracy.

[0006]

[Means for Solving the Problems]

 According to the present invention, two L-shaped members are arranged in a rectangular shape on the upper part of the base plate, and a guide tube having a gap between the ends of the adjacent L-shaped members is erected on the inside thereof. A height adjustment pipe is vertically movably inserted, a tubular body for inserting a reinforcing bar is joined to the upper end of this pipe in a T shape in the lateral direction, and the guide tube is attached to the lower end side of the height adjustment pipe. It is characterized in that stopper bolts that penetrate through the gaps facing each other are attached, and L-shaped pressing fittings that abut the outer surfaces of both L-shaped members are attached to both ends of the bolts.

[0007]

[Action]

 The underground beam main bar receiving stand of the present invention adjusts the position of the height adjusting pipe by sliding the stopper bolt up and down along the gap of the guide tube, and then tightening the nut to fix the L-shaped presser foot. Tighten the outer surfaces of the two L-shaped members that make up the guide tube with the metal fittings to fix them. Next, the underground beam main bar receiving stand is arranged at a predetermined interval on the discard concrete at the bottom of the groove dug in the ground, and the base anchor is fixed to the base plate. After this, the main reinforcements of the underground girders are placed on the rebars that penetrate the horizontal square pipes with a space in the lateral direction, the square hoop reinforcements are placed on this, and the underground girders are placed on the lower side of the hoop reinforcements. Place the lower main bar and tie it with wire to assemble the reinforcing bar. After this, when the formwork is assembled and the fresh concrete is poured in, the fresh concrete flows into the inside of the guide tube through the gap formed with a width that allows crushed stone to pass.

Further, since the stopper bolt is vertically pierced through the height adjusting pipe by utilizing the gap portion, the height adjusting pipe can be fixed at any position. Also, even if the weight of the reinforcing bar is added, the L-shaped press fitting attached to the stopper bolt is tightened by the nut, and the inside of the press fitting contacts the outer surfaces of the two L-shaped members to prevent the gap from expanding. At the same time, a large frictional force acts on the wide contact area to prevent buckling and displacement of the height adjustment pipe.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. This underground beam main bar receiving stand 20 has two L-shaped members 21 and 21 arranged in a square shape on the upper part of the base plate 2 and has a gap between the ends of the adjacent L-shaped members 21 and 21. A guide cylinder 23 having 22 and 22 is provided upright. L-shaped connecting fittings 24, 24 are welded to the side surfaces of the upper end portion and the lower end portion of the guide cylinder 23 so as to close the facing gap portions 22, 22. As shown in FIG. 4, the gap 22 is formed to have a width of about 20 to 25 mm through which the crushed stone 26 mixed in the green concrete 25 can pass.

Further, as shown in FIG. 1, a square pipe 7 penetrating a reinforcing bar 6 matching the beam width is joined in a T shape in the lateral direction at the upper end of the height adjusting pipe 4 inserted inside the guide cylinder 23. A bolt 8 for fixing the reinforcing bar 6 is attached in the middle of the square pipe 7. Further, as shown in FIG. 2, bolt insertion holes 28, 28 are formed at opposite corners on the lower end side of the height adjusting pipe 4, and stopper bolts 29 penetrate therethrough, and both ends of the stopper bolts 29 are shown in FIG. As shown in FIG. 3, the guide cylinder 23 is provided so as to project outward from the gap portions 22, 22.

L-shaped pressing fittings 30 are attached to the ends of the stopper bolts 29 protruding from the outside. By tightening the nut 14 attached to the stopper bolt 29, the insides of the holding metal fittings 30 and 30 form the outer surfaces of the two L-shaped members 21 and 21 forming the guide tube 23. The position of the height adjusting pipe 4 is fixed by abutting on it.

In the underground beam main reinforcement receiving stand 20 having the above-described structure, the stopper bolt 29 is slid up and down along the gaps 22, 22 to adjust the position of the height adjusting pipe 4, and then the nut 14 is tightened. As a result, the L-shaped pressing fittings 30, 30 are fixed by abutting on the outer surfaces of the two L-shaped members 21, 21 constituting the guide cylinder 23. After this, similarly to Fig. 7, the underground beam main bar receiving stands 20 ... are arranged at predetermined intervals along the longitudinal direction of the groove 10 on the waste concrete 12 at the bottom of the groove 10 dug in the ground. , The base anchor 13 is fixed to the base plate 2. After this, on the reinforcing bars 6 that match the beam width that penetrates the horizontal square pipes 7, the underground beam upper main bars 15 are placed laterally at intervals, and the square hoop bars 16 are placed on this. Furthermore, the lower main beam 17 of the underground beam is placed on the lower side of the hoop reinforcement 16, and the reinforcement is assembled by binding with wire.

After that, when the formwork is assembled and then the fresh concrete 25 is poured, the fresh concrete 25 is poured inward from the gap portions 22, 22 formed at the corners of the guide cylinder 23 as shown in FIG. Since the size of the gap 22 is wide enough to allow the crushed stones 26 mixed in the ready-mixed concrete 25 to pass through, the crushed stones 26 penetrate into the inside without solidifying and solidify, and thus the strength is high. Since concrete is formed on the entire surface, it is possible to prevent cross-section loss.

Further, in the fixing structure of the height adjusting pipe 4, as shown in FIG. 1, since the stopper bolt 29 is vertically pierced through the gap portions 22 and 22, it can be moved to any position. It can be fixed in place. Further, as shown in FIG. 3, the gap 22 between the L-shaped members 21 and 21 forming the guide cylinder 23 tends to buckle and widen when the weight of the reinforcing bar is applied, but it is attached to the stopper bolt 29. Shaped retainers 30, 30 are tightened by nuts 14, and the insides of retainers 30, 30 come into contact with the outer surfaces of the two L-shaped members 21, 21 to prevent the gap 22 from widening and to make a wide contact. Even if a large weight is applied due to a large frictional force acting on the area, it is possible to prevent buckling and displacement of the height adjusting pipe 4.

FIG. 5 shows another embodiment of the present invention, in which the height adjusting pipe 4 is formed by a round pipe, and the bolt inserting holes 28, 28 opened at the lower side of the height adjusting pipe 4 are shown. The stopper bolt 29 is passed through the both ends, and both ends are passed through the gaps 22, 22 between the L-shaped members 21, 21, and the L-shaped press fittings 30, 30 are attached to the L-shaped member 21. , 21 are fastened from both sides to fix the height adjusting pipe 4 and prevent the guide tube 23 from being deformed.

In the above-described embodiment, the bolt insertion hole 28 is formed on the lower side of the height adjusting pipe 4, and the stopper bolt 29 is penetrated here. However, at the lower end of the height adjusting pipe 4, The ring may be welded and the stopper bolt 29 may be penetrated here.

[0017]

[Effect of device]

 As described above, according to the underground beam main reinforcement receiving stand according to the present invention, the guide tube for vertically guiding the height adjusting pipe is configured by providing two L-shaped members with a gap. The raw concrete mixed with crushed stones fully intrudes into the inside from this gap and solidifies to prevent the cross-section loss of the beam to improve the strength, and at the both ends of the stopper bolt connected to the height adjustment pipe. The L-shaped presser fitting can securely fix the height adjustment pipe by tightening the L-shaped members that are adjacent to each other across the gap from both sides, so it is possible to prevent sinking due to the weight of the reinforcing bar and improve the bar arrangement accuracy. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an underground beam main bar receiving stand according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a connecting portion between the guide cylinder and the height adjusting pipe of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG. 1 in a state where fresh concrete is poured.

FIG. 5 is a sectional view of an underground beam main bar receiving stand in which a height adjusting pipe is a round pipe according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional underground beam main bar receiving stand.

7 is a front view showing a state where rebars are assembled by the conventional underground beam main bar receiving stand shown in FIG.

[Explanation of sign]

 1 Underground beam main bar receiving stand 2 Base plate 3 Guide pipe 4 Height adjustment pipe 5 Bolt 6 Reinforcing bar 7 Square pipe 8 Bolt 12 Discarded concrete 13 Base anchor 15 Underground beam upper main bar 16 Hoop bar 17 Underground beam lower main bar 20 Ground Middle beam main bar receiving stand 21 L-shaped member 22 Gap 23 Guide tube 24 L-shaped connecting metal fitting 25 Fresh concrete 26 Crushed stone 28 Bolt insertion hole 29 Stopper bolt 30 Holding metal fitting

Claims (1)

[Scope of utility model registration request] 1. A guide tube having two L-shaped members arranged in a quadrangular shape on the upper portion of a base plate and having a gap between the ends of adjacent L-shaped members is erected upright. A height adjusting pipe is vertically movably attached to the upper end of the pipe, and a tubular body through which a reinforcing bar is inserted is joined to the upper end of the pipe in a T shape in the lateral direction, and the guide pipe is attached to the lower end side of the height adjusting pipe. Underground beam main bar receiving stand, characterized in that stopper bolts penetrating the facing gaps are attached, and L-shaped pressing metal fittings that abut the outer surfaces of both L-shaped members are attached to both end sides of the bolts.