If you are looking for a broken water or drain line and you can figure out its general location, you'll save a lot of effort and expense. Here are some things to look for:  For plumbing problems, try to determine the location and depth of the underground pipes. Look for an outdoor faucet, sewer cap, or use a line locator. For water problems, look for areas where water is either bubbling up through cracks in the concrete or seeping out around the edges of the slab. For electrical lines, you may find you have to locate the conduit outside the slab area and dig up a length of it to determine where it runs. For other types of repairs, look up the construction blueprints with your municipal government or request them from the contractor who built your home. You may wish to measure distances from the slab's edge to make an even, parallel hole for less visible repairs. Use a pencil or chalk to mark off the location. Since you don’t know what is under the concrete, allow for plenty of room around your repair area to avoid causing further damage. If you are digging toward a specific line or pipe, shut off the power or water before you begin. You don't want to risk electrocution, flooding, or a gas leak. Always call the utility company to find out the location of power lines and other dangerous items before beginning projects that involve digging. the line as deeply as possible. Rent a concrete cutoff or demolition saw. Cut the line evenly to create a clean edge when your work is complete. If you are searching for a broken water pipe, you may have to enlarge the hole after the initial break is done.  Be very cautious while sawing. These saws are powerful and can cause serious injury, property damage, or death if used incorrectly. Always wear a respirator or face mask to protect your lungs from cement dust and always follow the tool's user instructions carefully. Whenever possible, use a wet saw and a steady flow of water to prevent airborne dust and damage to the saw blade. Use a heavy duty hammer drill or a breaking chisel attachment in a rotary hammer to chip the concrete next to the line you sawed. Tilt the chisel so the side you will be removing cracks loose, not the side you're keeping. Using the same tool, work the area around the cut, penetrating deeper each time until you've reached the bottom of the slab. This is the hardest part of the job, since the pieces you break off cannot come free until there is a space for them to drop into. You may need to leave tightly wedged pieces of concrete until the adjacent concrete is broken and removed. Once a gap has been created between the concrete you're removing and the concrete that's staying, chip further with the same tool. Widen it to at least 3 inches (8 cm), or enough to fully remove the broken pieces.  Keep your chisel point slanted toward the beginning hole while you work around the perimeter of the hole, so it doesn't try to penetrate straight down. If the chisel goes too deep, the bit will become lodged in its hole and will be difficult to remove. If a bit is truly stuck, you may need to use a new drill bit to break the concrete around it and free it. Once there is a wide enough gap to avoid damaging the concrete you wish to keep, you can use the techniques described in the section on removing a whole slab.  Use a pry bar as you go for the quickest and most effective results. Do not use a jackhammer or similar power tool if you are near a water pipe, electrical line, or gas line. Remove the broken chunks of concrete from the hole as it becomes larger so you can work more comfortably and spot pipes or electrical wires more easily. Use bolt cutters to snip reinforcing mesh and an angle grinder to cut through reinforcing bars. Once all the concrete is removed, chip the vertical walls of the hole to make them smooth and even. This will ensure a stronger repair (or a more attractive edge if you don't plan on replacing the concrete). If you're trying to find a damage utility such as a water pipe, look for signs as you go, such as water puddles or stains. Once you find the pipe, you may need to continue breaking concrete along its length until you find the damaged section.  As you approach the depth and location of the damaged line or pipe, slow down and swing your hammer more precisely to prevent further damage. To protect pipes and lines, refrain from hitting your hammer on the concrete directly above their suspected location underground. Avoid hitting cast iron or PVC pipes with the breaking hammer, as these are especially brittle and can easily become damaged.
حدد أين تريد كسر الخرسانة. حدد موقع الجزء الذي تنوي إزالته من الخرسانة. افصل جميع المرافق ذات الصلة. اقطع الخط بالمنشار لأعمق نقطة تستطيع الوصول إليها. قم بتكسير الخرسانة قرب القطع. زد عمق الحفرة بالتدريج. اكسر باتجاه الداخل لتوسيع الفجوة. اكسر القطع الكبيرة باستخدام مطرقة ثقيلة أو ثقابة كهربائية. نظف جدران الحفرة. ابحث عن الأنبوب المتضرر (إن أمكن).