KR101279609B1 - Spacer for steel reinforcement rebar cage - Google Patents

Abstract

PURPOSE: A spacer for a rebar cage is provided to improve self-supporting stability by dispersing load concentration due to the self-weight and centrifugal force of the rebar cage into two contact points through a pair of bridges. CONSTITUTION: A spacer for a rebar cage comprises an inner wheel(11), a tension grip(12), an outer wheel(13), a rib(14), an inlet bridge(16), a down bridge(17), and a side bridge(18). The inner wheel is shaped into a cylinder, is positioned in the center of a spacer, and is arranged on the concentric axis as the outer wheel. A plurality of ribs connect the inner and outer wheels. The tension grip is extended from the inner wheel for gripping the length material of the rebar cage by forming a gap into the shape of an arc. The inlet, down, and side bridges are protruded with a mountain shape and include through holes, respectively.

Description

Rebar Mesh Spacer {Spacer for steel reinforcement rebar cage}

The present invention relates to a reinforcing bar spacer used in the manufacture of PHC piles, concrete poles, reinforced concrete pipes, and the like, in particular, the concentrated load due to the self-weight and centrifugal force of the reinforcing bar is distributed through two paired bridges, The orientation of the installation location is free and can be used to appropriately change the thickness of the concrete cover, to prevent reverse deviation from the reinforcing bar network, to be fixed in close contact with length members of various diameters, and to increase the contact surface of the spacer and It relates to a reinforcing bar spacer that can be lowered and prevented from falling or falling out.

PHC piles, concrete poles, and reinforced concrete pipes are fabricated by assembling the reinforcing bar network to give toughness. At this time, the rebar network has a structure in which a length member (rebar or steel bar) is installed at a predetermined interval in the circumferential direction in a circular ring. In order to install the reinforcing bar in the formwork, spacers are used to form a certain distance (coating thickness) from the formwork.

When the above products are manufactured by the centrifugal compacting method, the rebar network is subjected to vertical load or centrifugal force. Therefore, the spacer inserted into the reinforcing bar is also subjected to a large load through the reinforcing bar, so it must have a sufficiently strong structure and must not fall or fall off the length bar. If the spacer does not meet the weight or centrifugal force of the reinforcing bar, deformation cannot be achieved to achieve the desired coating thickness, and if the spacer falls or falls, a problem occurs in the coating thickness.

As a background technology of the present invention, Korean Laid-Open Publication No. 1999-0041422, a reinforced spacer for reinforced concrete formwork is proposed. The 'C' ring parts, one side of which is open, are installed with radial intervals at the same center, and the 'C' ring parts are connected to each other through a plurality of ribs formed radially from the center formed by the 'C' ring parts. A circular arc-type expansion and contraction is formed so that the opening is formed through the outside from the outside to the reinforcement can be inserted into the inner 'C' ring portion, and can be stretched in the circumferential direction in the middle of the 'C' ring portion located on the outer shell An additionally formed reinforcing spacer comprising: a concave-convex portion for pressing the outer circumferential surface of the reinforcing bar on the inner circumferential surface of the 'C' ring portion located at the center thereof, and a unidirectional locking tension projection and a unidirectional locking groove engaged with each other on the inner surface of the opening, respectively. While forming a plurality, the lower catching jaw and the upper catching jaw to prevent the one-way catching projection is separated in the vertical direction It is configured to respectively form the upper and lower portions of the one-way locking groove.

However, in the background art, the outermost ribs are formed in a plate shape, and thus the support force is insufficient, so that deformation occurs when the vertical load or the centrifugal force is received through the rebar network. In addition, the structure of the rib connecting the ring portion is weak. In particular, the contact area with the reinforcing surface may be small and may fall or fall, thereby failing to obtain a desired concrete cover thickness.

Korean Patent Publication No. 2011-0103025

The present invention distributes the concentrated load due to the weight and centrifugal force of the reinforcing bar to two points through a pair of bridges, the orientation of the installation is free, and can be used in response to the change in the thickness of the concrete cover, the reverse from the reinforcing bar The purpose of the present invention is to provide a reinforcing bar spacer that is prevented from falling off and fixedly adhered to length members of various diameters and at the same time widening the contact surface of the spacer to prevent the falling or falling phenomenon.

According to a preferred embodiment of the present invention,

In the spacer which is assembled and used in the reinforcing net used in the manufacture of PHC pile, concrete pole, reinforced concrete pipe,

A cylindrical inner wheel located at the center;

A tension grip that extends through the neck at the inner wheel and has a spaced distance from the inner wheel to open the arc to hold the reinforcing bar length member with elastic repulsive force;

A cylindrical outer wheel having a larger diameter than the inner wheel and disposed coaxially with the inner wheel;

A plurality of ribs radially disposed to connect the inner wheel and the outer wheel; And

And a pair of inlet-side bridges having a length member guide opening narrowing to the upper and lower straits for guiding the insertion of the length member of the reinforcing mesh toward the tension grip and protruding at the same height on the outer circumferential surface of the outer wheel.

In addition, a pair of down bridges which are located opposite the pair of inlet side bridges and protrude at the same height on the outer circumferential surface of the outer wheel;

Two pairs of side bridges positioned between the inlet side bridge and the down bridge and protruding at the same height on the outer circumferential surface of the outer wheel;

Each pair of inlet and down bridges and side bridges have the same height from the center of the inner wheel or have different heights in order to cope with changes in coating thickness, so that the length can be easily adjusted according to the assembly direction. It features.

Further, the inner diameter of the inner wheel is larger than the maximum cross-sectional diameter of the reinforcing bar length member, and the inner diameter of the tension grip located inside the inner wheel is narrower than the minimum cross-sectional diameter of the reinforcing bar length material, and the inner wheel and tension The grip is connected through the neck to secure the empty space between the inner wheel and the tension grip, and the tension grip is opened by the length member inserted by the length member to hold the length member with elastic repulsive force, but the tension is caused by the inner diameter of the inner wheel. By limiting the degree of opening of the grip is characterized in that it is strongly effective to hold the length member having a variety of diameters.

In addition, the tension grip is characterized in that a plurality of tension projections are further formed on the inner surface to increase the adhesion with the reinforcing bar length member.

And a tension bar extending from the inlet side bridge to maintain the length guide opening and close to the tension grip and having a width smaller than the gaped width of the tension grip;

The tension bars are respectively supported on tension bar supports connected to the ribs;

Tension bar knobs are further configured on the tension bar to prevent reverse drop-out of the rebar mesh spacer fitted to the tension grip.

In addition, the reinforcing bar spacer has a triangular shape with the inner wheel length at one side of the cross section and the length of the inlet bridge height at one side cross section, and the actual center of gravity of the triangular shape is lower than the center line of the reinforcing bar length member It has a fall prevention structure, and the tension grip is characterized in that it has the same length as the length of the inner wheel.

In addition, the tension bar is characterized in that the length of its longitudinal direction is shorter than the length of the inner wheel and the length of the tension grip and longer than the length of the outer wheel length direction has a ladder shape.

According to the rebar mesh spacer of the present invention, the self-weight and centrifugal force of the rebar mesh are distributed to the two contacts through a paired bridge to improve the self-reliability.

In addition, the height of the plurality of pairs of bridges are the same to enable installation regardless of the direction, or the height of the plurality of pairs of bridges to have a directional, different lengths for securing the different cover, tension The knob of the bar can prevent the reverse deviation from the rebar network.

In addition, the tension projection of the tension grip is tightly fixed to the length member of various diameters.

In addition, the tension grip and the inner wheel is longer than the outer diameter of the spacer by 1/2 or more, the contact surface of the spacer is widened, thereby lowering the center of gravity can prevent the phenomenon of falling or falling.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a perspective view of a rebar mesh spacer according to an embodiment of the present invention.
2 is a plan view of Fig.
3 is a sectional view taken along the line AA in Fig.
Figure 4 is an installation state of the rebar mesh spacer of Figure 1 assembled in the rebar network.
Figure 5a is a view showing the coating thickness due to the installation of the rebar mesh spacer of Figure 1;
5B and 5C show various coating thicknesses through rebar mesh spacers of different lengths in bridges.
6 is a plan view of a rebar mesh spacer according to another embodiment of the present invention.
7 is a plan view of the rebar mesh spacer configured by varying the height of the bridge according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

The rebar mesh spacer 10 according to the present invention is assembled to the length member 1a (round rebar or bar) of the rebar mesh 1 used in the manufacture of a PHC pile, concrete pole, reinforced concrete pipe, etc. as shown in FIG. 4. It is done. Reference numeral '1b' is a ring-shaped reinforcing bar connected to the length member. The spacer 10 is made of synthetic resin.

Reinforcing bar spacer 10 is composed of a semi-cylindrical inner wheel 11 located in the center as shown in Figs. The inner diameter of the inner wheel 11 is made larger than the maximum cross-sectional diameter of the length member 1a of the reinforcing bar 1. At this time, the inner wheel 11 is configured to have a relatively long axial length than the outer wheel 13 to be described later.

As shown in FIG. 3, the reinforcing bar spacer 10 has an approximate triangular shape with the length L of the inner wheel 11 at one side and the height h of the inlet bridges 16, 16 as the bottom side. It appears that the actual center of gravity (G) of the triangular figure is configured to be lower than the center line (X) of the reinforcing rod length member (1a) has a fall prevention structure. Therefore, the rebar mesh spacer 10 has a fall prevention structure that does not fall by itself as the center of gravity G is lowered.

An arc-shaped tension grip 12 is formed inside the inner wheel 11. Preferably, the tension grip 12 has a length equal to the length L of the inner wheel 11. The tension grip 12 extends inwardly from the inner wheel 11 through the center neck 11a and is formed in an arc shape. The inner diameter of the tension grip 12 is the length member 1a of the reinforcing bar 1. Narrower than the minimum cross-sectional diameter. Therefore, the tension grip 12 is open to the steel to hold the length member (1a) with elastic resilience as shown in FIG. The tension grip 12 is preferably formed with a plurality of tension projections (12a) on the inner surface. In the present embodiment, the tension protrusion 12a is formed in the longitudinal direction along the central axis direction to make linear contact with the length member 1a to increase frictional force.

A cylindrical outer wheel 13 is configured to the outside of the inner wheel 11. The outer wheel 13 has a larger diameter than the inner wheel 11 and is disposed coaxially with the inner wheel 11.

The inner wheel 11 and the outer wheel 13 are connected by a plurality of ribs 14. The rib 14 extends radially at regular intervals from the outer circumferential surface of the inner wheel 11. Therefore, between the inner wheel 11 and the outer wheel 13, a plurality of rib holes 21 located between the adjacent ribs 14 and 14 are formed. It is preferable that a reinforcing rib 22 is further formed around the rib hole 21 to increase the cross section to resist the vertical load and the centrifugal force.

On the outer circumferential surface of the outer wheel 13 a plurality of pairs of bridges are provided which provide two contacts of the spacer 10. That is, a pair of inlet side bridges 16 and 16, a pair of down bridges 17 and 17 and two pairs of side bridges 18 are included.

The pair of inlet side bridges 16 and 16 have length guide openings 15 to guide the insertion of the length member 1a toward the tension grip 12 and protrude at the same height on the outer circumferential surface of the outer wheel 13. do. The length guide opening 15 has a V-shape that narrows to the upper and lower narrow narrows.

The pair of down bridges 17 and 17 are located opposite to the pair of inlet side bridges 16 and 16 and protrude at the same height on the outer circumferential surface of the outer wheel 13.

Two pairs of side bridges 18 and 18 are positioned left and right between the inlet side bridges 16 and 16 and the down bridges 17 and 17 so that each pair protrudes at the same height on the outer circumferential surface of the outer wheel 13. It is.

The inlet side bridges 16 and 16, the down bridges 17 and 17, and the side bridges 18 and 18 are raised approximately in a mountain shape, and the vertices form convex round curved surfaces, and the through holes 16a are formed therein, respectively. , 17a, 18a are formed.

Here, the pair of inlet bridges 16, down bridges 17 and 17 and side bridges 18 and 18, respectively, have the same length so that the same covering can be maintained in all directions regardless of the direction. have. In this case, the rebar mesh spacer 10 is free to be installed in the direction. In addition, if the pair of inlet bridge 16, the down bridge (17, 17) and the side bridge (18, 18) to each of the different lengths have different heights, the structure can be easily adjusted according to the assembly direction Becomes

Tension bars 161 and 161 extending from the inlet bridges 16 and 16 to maintain the length guide opening 15 and proximate the tension grip 12 are included, and the tension bars 161 and 161 are ribs 14. It is supported by tension bar supports 162 and 162, respectively. The tension bar knobs 161a are further configured on the tension bars 161 and 161 so as to prevent backward dropping of the rebar mesh spacer 10 fitted to the tension grip 12. The knob 161a may be, for example, triangular or circular in shape. At this time, the width of the tension bars 161 and 161 is smaller than that of the tension grip 12.

In addition, in order to increase the holding force of the reinforcing bar length member, the tension bar 161 is shorter than the same length of the inner wheel 11 and the tension grip 12 in the longitudinal direction as shown in Figure 3 and the outer wheel 13 It is preferable to have a ladder form that is configured to be longer than the longitudinal direction of the.

The rebar mesh spacer 10 configured as described above is used at the time of manufacture of PHC pile, concrete pole, reinforced concrete pipe, and the like.

That is, before the concrete is poured, each of the plurality of length members 1a disposed at regular intervals in the circumferential direction of the reinforcing bar 1 as shown in FIGS. At this time, the rebar mesh spacer 10 is linearly contacted with the tension protrusion 12a of the tension grip 12 to the length member 1a, thereby increasing the frictional force, thereby securing a position fixing force.

In addition, the tension grip 12 can be commonly used for length members 1a (reinforcing bars or steel bars) of various diameters by holding the length members 1a while opening corresponding to the cross-sectional size of the length members 1a. .

In addition, as shown in FIG. 5, any one of the inlet side bridges 16 and 16, the down bridges 17 and 17, and the side bridges 18 and 18 is selected regardless of the directivity, and contacts the formwork 2 in all directions. The same coating t can be maintained. Where 'PCD' represents the pitch circle diameter of the length member.

In addition, a pair of finally selected through the tension grip 12, the inner wheel 11, ribs 14, the outer wheel 13, even if the reinforcing bar (1) receives a vertical load or centrifugal force when manufactured by the centrifugal force compacting method The contact is supported by two contacts through the bridge, which effectively distributes the load.

In addition, the reinforcing rib 22 is configured to sufficiently withstand the weight of the reinforcing bar 1, the deformation of the outer wheel 13 is prevented, and each bridge is stably supported.

In addition, the inner wheel 11 and the tension grip 12 are extended in the axial direction long, so that the center of gravity is low so that the rebar mesh spacer 10 is easily inserted into the length member 1a and then the spacer member 10 easily falls over. It has a stable fall prevention structure that is not supported.

In addition, the rebar mesh spacer 10 is supported by the rebar mesh spacer 10 which is inserted into the tension grip 12 so as to be caught by the tension bar knob 161a of the tension bar 161 so that the rebar mesh spacer cannot be easily pulled out in the reverse direction of the pulling direction. Falling off is effectively prevented.

Meanwhile, the rebar mesh spacer 10 according to the present invention does not extend the tension bars 161 and 161 in a straight line from the inlet side bridges 16 and 16 as shown in FIG. 2 but through the step 163 as shown in FIG. By extending to narrow the width, it can be applied to reinforcing bar length members having a small diameter cross section.

In addition, the rebar only spacer 10 according to the present invention is a pair of inlet bridge 16, down bridges 17 and 17 and side bridges 18 and 18, respectively, as shown in FIG. They can have different heights to correspond. For example, when the height of the side bridges 18 and 18 is H1, the height of the inlet bridge 16 is H2, and the height of the down bridges 17 and 17 is H3, it may be configured as H1> H2> H3. . Accordingly, depending on the selection of these bridges, different coating thicknesses t1 or t2 can be obtained as shown in FIGS. 5B and 5C.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

11: inner wheel
12: tension grip
12a: tension projection
13: outer wheel
14: rib
16: entrance bridge
161: tension bar
161a: tension bar knob
17: Downbridge
18: side bridge
22: reinforcing rib

Claims (7)

In the spacer which is assembled and used in the reinforcing net used in the manufacture of PHC pile, concrete pole, reinforced concrete pipe,
A cylindrical inner wheel 11 positioned at the center;
It extends through the neck 11a in the inner wheel 11 and opens in an arc shape with a spaced interval spaced from the inner wheel 11 to hold the reinforcing bar length member with elastic resilience and the same length as the length of the inner wheel 11. A tension grip 12 having;
A cylindrical outer wheel 13 having a larger diameter than the inner wheel 11 and disposed coaxially with the inner wheel 11;
A plurality of ribs 14 arranged radially to connect the inner wheel 11 and the outer wheel 13;
A pair of inlet side bridges (16, 16) protruding on an outer circumferential surface of the outer wheel and having a length member guide opening (15) narrowing to a light receiving narrow guide for guiding the insertion of the length member of the reinforcing bar toward the tension grip (12);
A pair of down bridges 17 and 17 positioned opposite to the pair of inlet side bridges 16 and 16 and protruding on the outer circumferential surface of the outer wheel 13;
And a pair of side bridges 18 positioned between the inlet side bridges 16 and 16 and the down bridges 17 and 17 protruding from the outer circumferential surface of the outer wheel 13.
The inlet side bridges 16 and 16, the down bridges 17 and 17, and the side bridges 18 and 18 are raised in a mountain shape, and the vertices form convex round curved surfaces, and through-holes 16a, 17a, 18a) are formed,
The load received by the rebar mesh is supported by two contacts through a pair of bridges finally selected through the tension grip 12, the inner wheel 11, the rib 14, and the outer wheel 13 to effectively distribute the load. Rebar mesh spacer characterized in that. The method of claim 1,
Each of the pair of inlet bridges 16, the down bridges 17, 17 and the side bridges 18, 18 may have the same height from the center of the inner wheel or may have different heights to cope with changes in the coating thickness. Rebar mesh spacer characterized in that it has a structure that is easy to adjust the length according to the assembly direction. The method of claim 1,
The inner diameter of the inner wheel 11 is configured to be larger than the maximum cross-sectional diameter of the reinforcing bar length member, and the inner diameter of the tension grip 12 located inside the inner wheel 11 is narrower than the minimum cross-sectional diameter of the reinforcing bar length material. And the inner wheel 11 and the tension grip 12 are connected through the neck 11a to secure the empty space between the inner wheel 11 and the tension grip 12 so as to be tensioned by the length member inserted therein. The grip 12 is strongly opened to hold the length member 1a with elastic repulsive force, but the opening degree of the tension grip 12 is limited by the inner diameter of the inner wheel 11 so that the length member having various diameters is strongly and effectively. Rebar mesh spacer characterized in that holding. The method of claim 1,
The tension grip 12 is a rebar mesh spacer, characterized in that a plurality of tension projections (12a) is further formed on the inner surface to increase the adhesion with the rebar mesh length member. The method of claim 1,
Tension bars 161 and 161 extending from the inlet side bridges 16 and 16 to maintain the length guide opening 15 and proximate to the tension grips 12 and having a width smaller than the gaped width of the tension grips 12 are included. Become;
Tension bars 161 and 161 are supported by tension bar supports 162 and 162 respectively connected to ribs 14;
Reinforcing bar spacers, characterized in that the tension bar knobs (161a) are further configured on the tension bars (161, 161) so as to prevent the reverse drop of the rebar mesh spacer (10) fitted to the tension grip (12). The method of claim 1,
The rebar mesh spacer has a triangular figure with the length L of the inner wheel 11 at the bottom side and the length of the inlet bridges 16, 16 as the height h at one side cross-section. Rebar mesh spacer is characterized in that the structure is configured to be lower than the center line (X) of the rebar mesh length member having a fall prevention structure. 6. The method of claim 5,
The tension bar 161 is characterized in that the length of the longitudinal direction of the inner wheel 11 and the tension grip 12 is shorter than the length of the longitudinal direction of the outer wheel 13 and longer than the length of the longitudinal direction of the outer wheel 13 has a ladder shape. Rebar mesh spacer.

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