Because the basement is close to the groundwater level, there are many concealed pipes, and the construction process is complex, quality problems are likely to occur after delivery, such as leakage of roof and settlement joints. In particular, the settlement joints are troublesome to deal with. How to deal with the leakage of basement settlement joints? Shanghai Gulan Plugging Co., Ltd. has brought you the method of plugging the basement settlement joint. The following is a detailed introduction.
Principle of settlement joint plugging technology
The settlement joint leakage plugging technology refers to the use of high elastic plugging agent. This material has very good elasticity and can fill the gap very well. At the same time, compared with rubber waterstop, this material has better flexibility, strength and shear resistance. During curing, it can firmly fit with concrete materials and bond with the original rubber waterstop.
On the one hand, it can effectively strengthen the mechanical performance of the waterstop;
On the other hand, it can effectively improve the impermeability of concrete. Therefore, this technology effectively uses the material characteristics, and realizes the waterproof characteristics of rigid and flexible, solving the problem of settlement joint leakage
How to deal with water leakage of basement settlement joint
According to the process method, the settlement joint plugging technology can be divided into direct plugging method and pressure grouting method.
1. Direct blocking method. It means that the leaking part is chiseled out according to the design standard and then compacted with corresponding plugging materials to prevent seepage. This method is widely used in the field of point leakage.
2. Pressure grouting plugging method. Construction picture of leak stoppage at settlement joint of Shanghai Gulan
Detailed steps of leak stoppage method for basement settlement joint
1. Find out the water seepage point
Clean the water seepage point. Boreholes shall be evenly arranged outward at the center of the leakage point surface, or 5 cm away from both sides of the crack. The drilling height shall be 1/3 of the thickness of the whole structure. The drilling of the crack must ensure that the depth of the deep hole reaches the height of the crack, and the drilling shall be conducted along both sides of the crack once. The drilling spacing should be controlled at about 20-25cm.
2. Clear sundries
Clean the impurities and dust in the hole, and then install the water stop needle to ensure the tightness of the needle installation. Use the electric high-pressure grouting pump to inject the plugging agent and epoxy resin into the pores, strictly control the injection rate until the pollution is pressed into the mortar and the slurry overflows without bubbles, close the valve, and remove the needle after 72h. Use solvent to clean equipment or tools after grouting.
3. Base treatment
In the base course treatment, the top plate treatment shall be carried out first, then the side wall treatment, and then the bottom plate treatment. The key point of cleaning is to reserve the impurities and materials in the settlement joint. The loose concrete layers on both sides of the joint shall be removed until all the joints are solid concrete.
The original rubber waterstop shall be exposed directly in the joint, and the settlement joint shall be cleaned with a high-pressure water gun until the water is completely clean, so as to ensure that the joint is clean enough. The treatment process of the base layer is very critical and needs to be careful and patient enough. After the cleaning is completed, the special personnel of the solid blue plugging company will check it, and then go to the next process after passing the inspection.
4. Hole arrangement and drilling
The hole arrangement position is the concrete position on both sides of the settlement joint, and the hole spacing is controlled within 500-1000mm. The drilling machine is aligned with the hole arrangement center to conduct oblique drilling. The drilling height should be through the embedded waterstop in the concrete to the lower part of the waterstop in the settlement joint, and the high-pressure grouting waterstop needle should be installed to prepare for grouting.
5. High pressure grouting
High pressure grouting material is solid high elastic plugging agent. The grouting pressure shall not be less than 2MPa, and the constant pressure shall be maintained for grouting for more than 10min. The solid blue high elastic plugging agent shall be filled to the lower part of the embedded waterstop of the settlement joint under the action of high pressure, and shall be filled in the pores with dense sand and stone and not compacted by vibration, so as to ensure that the TPT-2 plugging is firm and sufficient, and form a dense solid high elastic plugging agent colloid in the settlement joint. Since the gap will constantly leak water, and the solid high elastic plugging agent will repeatedly expand after encountering water, as long as water seepage occurs, it will play a role in plugging. Therefore, the application of high elastic plugging material in the secondary waterproof construction of settlement joints has obvious advantages.
6. Embedded cavity
In order to ensure the long-term waterproof performance of the settlement joint and not be affected by the settlement joint and expansion joint subsequently, the cavity of the secondary high-pressure grouting solid high elastic plugging agent is embedded on the basis that the settlement joint has been filled with the solid high elastic plugging agent material, so that the secondary grouting of the solid high elastic plugging agent can be carried out to achieve dual waterproof. In the setting of the cavity, cotton yarn of appropriate thickness shall be inserted into the settlement joint, and then sealed with high elastic plugging agent, and the surface shall be trowelled and polished to form a cavity.
7. Embedded expansion rubber
The expansion rubber will also expand when encountering water, so it is necessary to embed expansion rubber in the settlement joint. The rubber embedding width is the same as the width of the settlement joint, so as to compact and compact. Pour high elastic plugging agent material on the surface of expanded rubber, and trowel and polish it.
8. After the secondary grouting, when the setting strength of the high elastic plugging agent material in the settlement joint reaches more than 90% of the standard strength, the secondary grouting of the high elastic plugging agent can be carried out in the high-pressure grouting head led out by the pre embedding. The grouting pressure is not less than 2MPa, and the constant pressure grouting is more than 10min, forming the second waterproof layer of the high elastic plugging agent. The function of secondary grouting is to combine with the original rubber waterstop in the settlement joint to form an integral expansion rubber waterstop. The waterstop produced after two times of grouting has stronger performance and better waterproof performance, which can achieve a better waterproof function of the settlement joint and ensure that the settlement joint maintains a good waterproof performance to a large extent in long-term use.
To sum up, the above is the "settlement joint plugging (basement settlement joint plugging method)" for you. The materials selected by Gulan have good ductility, which can make up the leakage surface of basement settlement joints. More relevant plugging