what is plinth beam? plinth beam construction and beam size, What should be the concrete ratio of the plinth beam

What is plinth beam 

plinth beam

plinth beam is concrete based strong beam. It is used between wall and foundation for house. After leveling the foundation of the house, a concrete beam was placed on it, which we call a plinth beam. Its special purpose is to do the weight of the whole house in balances. Applying a plinth beam leaves the house very strong. Like the walls of the house are not cracked. For this reason, it is very important to install plinth beams in the house or building. If we build houses or building and shops, malls, the plinth beam has the same purpose.

Plinth Beam size

We can do any size according to the size of the beam. But most of the foundation is beamed leaving a 9-inch wall. The width of the plinth beam will be 9 inches and the height of the beam will also be 9 inches. This beam of this size is installed in the every house. Its strength becomes enough. In a beam of this size, we will make a ring of 7 * 7 and put 4 steel rods in it. In rings, we will use 8 mm rods and the middle bars will use 12 mm. This way the beam will be ready.

Plinth beam construction

 I'm going to show you how to set out the railsand the plinth for picket fence. The equipment you're going to need to do that will includea saw, some safety equipment, some measuring equipment, hammer and chisel, a nail gun,spirit level, sawhorses are also going to be helpful, and obviously your rails and yourplinth boards. You also need a ladder for getting up to the top rail. So now that we'velet our concrete sit around our post, it's time to remove all the bracing and start withtheir setouts. So now we're ready to set out for the plinth. The plinth is a bottom boardthat makes the fence look finished off at ground level and also support your picketswhen you put them in. Once we've determined where that plinth isgoing to go, I'm going to mark around the post and then cut a block in order to fixthe plinth too. The plinth we're using for this job is made out of treated pine and it'streated to prevent against rot or insects. So now that I've worked out where the topof my plinth will be, I need to work out where my fixing block is going to go. I'm goingto measure up the same distance as my rail and that will be where my fixing block goes.The next step is to cut a block and fix it in so I have something to attach my plinthto. You could use anything as the block but I'm going to use an off cut of the treatedpine. When you're using treated pine, always usea dust mask. So now we can nail this block in place and start to set out the plinth.So now that I've got that block in place, I can measure and cut my plinth and then labelit. So now we can put the plinth in place, fix it one end, and then level off the otherend. I'm just putting one nail in at this stage so that I can level the plinth completelyacross and then nail it off. So now that I've got my plinth leveled, I can mark off on thepost and transfer those marks around where I'm going to put my fixing block. I now need to cut another block to fix underthe post that I can fix my plinth to. But I'm actually going to cut a few because I'llneed them for each post. So now I'm going to fix this block in place, then fix my plinthback to the blocks and then continue along between all the post all the way along thefence line. So now that we've got our plinth line all the way through this fence, we'renow going to start setting out for the rails. This post here is part of the existing fenceline for the rest of the property, so I'm going to use all my measurements from thispost. You can see that it's already been checkedout in a couple of spots. So these will be our reference lines. Now just a little wayto make it easy for you is I use one of the pickets that you'd be using for the fence.Just put it up on top of the plinth and make all these marks that correspond with the railcutouts. If you are starting from scratch to try and work out where to put your rails,ideally you put one through around about the center of the picket and then come up a littlebit from the bottom, down a bit from a top just enough to keep the picket nice and straight. So now that I've transferred my marks ontothe picket, I'm going to square those lines across and use it to mark out the rest ofmy posts. This is a handy way to make sure that all the measurements on all the postsare identical. So now we've got our marks on the post, we can transfer those lines aroundwith the square and we've got the setout section for our rails. Then you can come back andwork out the depths of the rail and make that mark. I tend to put across on the piece oftimber that I'm actually going to cut out. It's a good visual reminder of the piece you'llbe taking out of the post. So now that we've marked out for the railson all that posts, we need to cut them. The first thing you do is set the depths of yoursaw. The depths will be just slightly over the width of the rail that's going in to thepost. So now we'll put our safety gear on and cut along the lines. I'm going to makea few cuts along here that will make chiseling out the timber easier. The first thing I'mgoing to do is just chisel down the pencil line. That will give me a nice clean edgewhen all the waste is gone. Also make sure that you don't chip away at the rest of thepost. So, I'll just do the same on the other side and then we can get rid of all the middlepart. Just use an off cut of your rail to make surethat you've checked out enough or you might need to tidy up the whole little bit moreand then just continue on. So now that we've cut out for all our rails into the post, it'stime to do the ones in the corner. When you have a corner post or at the end of the line,you need to do a housing joint. This joint doesn't go all the way through like the otherrails did. It actually stops on the internal face of the post. We mark it out just thesame but we need to cut it out a little differently. So the biggest difference with the housingjoint is that we actually stop. We don't go all the way through the rail like we did beforeon the other posts. We need to stop here. So when we put the saw in, we must stop atout our lines that we've marked out. So once you've made your saw cuts, we just clean itout like we did with all the others. So I've just taken the measurements between my firsttwo posts. Because the overall length is longer than the timber that I'm using for the rail,I'll need to make some joints. So you'll always join it in the center of a post. I'm goingto start with the short spin, then have a longer spin, and on the next level I'm goingto reverse that long over short, short over long. When we make cut in the corner, we do thatat a 45-degree angle so that the rail coming from the other direction will meet in themiddle. So now we're just going to measure out the rail for the first section, make thatcut, and pop it into place. So now that we've cut our rail, this is the 45 end that's goingto go into the corner and then we just need to nail it off. You'll notice that the timberrails I'm using are pink color. They are also treated pine timber but they've been primedready for painting. It just makes the painting process easier later on. But now I'll justcontinue along this rail and do the top of the bottom as well. So that's it. We've setout and put our plinths in our rails in. The next step is going to be to put the picketson.

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Plinth Beam concrete ratio

 Hello Every on, we have seen the estimation of, quantity of concrete for lift in Microsoft Excel. In this video, we will learn the estimation quantity of concrete required for column. If you have not watched our previous videos,please watch those videos first. Now, let's start with the tutorial. As you can see here, the columns are divided into same group as footing. The first group of columns has 15 columns in it whose size is 230mmX300mm. So I have entered the number as 15 and size as 0.23mX0.3m. Now, the height of column. The height of bottom story is 2.7m and the footing is 2m below ground level. So the columns will be 2m below ground level. So, the Total height of column from FOOTING TOP TO PARKING SLAB=2.7m+2m=4.7m For your better understanding I am showing you the section of column from footing to top storey in the AutoCAD. As you can see here in section, the bottom storey is 2.7m and the foundation is taken 2m below ground level. So, the total is 4.7m for our calculation. Which can be entered in excel in height column. Similarly, the other storeys are of 3m height. That is, first stilt floor, second stilt floor and third stilt floor are of 3m height. The last part remaining is calculation of quantity. And it will be calculated by, just multiplying number, length, width and height. So the formula in excel will be,= cell C23, multiply by cell D23, multiply by E23, multiply by F23. Which comes as 4.86 cubic meter. Similarly calculate the quantity of concrete for other column groups. Just insert number and size there. Because height is constant which is 4.7m. For calculation of quantity just drag the cursor downwards, and Excel will calculate the quantity. Similarly, I have just copy pasted the above groups and changed the value of height of floor from 4.7m to 3m, as all the above floor sare of 3m height. So, just copy paste the above items, as our size and numbers of columns in a group are same. You will just have to change the value of height from 4.7m to 3m in Excel. In this way, quantity of concrete for column from footing top to 3rd floor can be calculated in Excel. But the quantity of concrete for all columnsis not complete yet. In the plan, as you can see here, there willbe 4 columns for supporting the headroom slab. So those columns should be taken separately. Those columns are column C21, C22, C32, and C3. The size of these columns is 230mmX230mm. So I have entered the length and width as0.23mX0.23m. There are 4 columns in this group, so the numbers will be 4 in excel. The height of headroom column is 2.6m, soI have entered the value as 2.6m. Now quantity can be calculated similarly,as we have calculated previously. The same group of columns are extended upto water tank. So, I just copy paste this and change the height only. The height for head room was 2.6. So, change this value from 2.6m to 2m, as the height of columns for water tank is 2m. The last part is to add up the total quantity of concrete for the columns of all the floors. So, put the formula in excel as=SUM(cell G23: cell G52), which comes to be 35.67 cu.m. In this way you can calculate the quantity of concrete required for columns. In the next video we will start with calculation of quantity of concrete for lift shear wall in Excel. If you have any query or doubt about this tutorial, you can ask in the comment section below. 

Plinth Beam section

 If you take a steel section let's say a steel bar and then we apply forces in this direction, P and P then this steel section goes into tension. I can give you an example.. a rubber band. If you try to pull it apart it tries to push your fingers together like this. So same thing happens here, this steel section tries to work against this force. So basically this steel section is in tension. And now if we take a concrete column with a support at the bottom and if we apply a force at the top P then we will have a reaction P and this section goes into compression because the section tries to work against the force we are applying in this direction. So basically this concrete column is in compression. Concrete is good in compression and steel is good in tension hence why we use rebar in reinforced concrete. If we take a cross-section of a reinforced concrete beam, we add rebar at the bottom for a scenario like this. If we take a simply supported reinforced concrete beam and if you apply a load P here it would try to bend like this and the bottom two surface goes into tension and top surface will go into compression. Hence we use rebar at the bottom and concrete at the top.

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