Diaphragm wall joint flexible water stop installing device and method

Abstract

The invention relates to a diaphragm wall joint flexible water stop installing device and a method. The installing device is a connector pipe structure made of steel plates or profile steel with width-thickness ratio being close to 1, at least one mounting groove capable of installing a rubber water stop is arranged on one side of the installing device in contact with concrete, and the width at an opening of the mounting groove is slightly smaller than that of a groove cavity. Since the width-thickness ratio of the connector pipe is close to 1, one side of the connector pipe in contact with soil is closely stuck with a soil layer, no phenomenon of flow around exists during the concrete pouring process, the subsequent construction of the groove section is greatly facilitated, and the installing device and the installing method have the advantages of the round pipe connector and overcome the defects of the I-shaped steel connector; the installation and the disassembly are convenient; the connection of the connector pipes is reliable, and the installing device and the installing method have sufficient rigidity, further meet the requirements for deformation resistance and connection and provide convenience for lifting the connector pipe; and the installed rubber water stop has good effect, does not drop off, can be completely retained on a concrete interface, and can well be adapted for the deformation caused by long-term dynamic load in the soft soil strata and prevent the seam from leaking due to misplacement.

Description

technical field [0001] The invention relates to an installation device and method for using flexible waterstop joints such as rubber in the construction of an underground diaphragm wall, and is an underground diaphragm wall joint construction process that can adapt to various strata. Background technique [0002] Diaphragm wall is an important type of deep foundation pit support structure wall for underground buildings. Before constructing underground buildings, excavate slots and pour underwater concrete structures section by section along the perimeter of the underground buildings to be constructed. A complete underground diaphragm wall enclosure generally consists of length It is formed by splicing unit slots less than 6m in length. Its basic process includes six major construction processes, including guide wall production, mud retaining wall and earthwork excavation into trenches, slag removal and slurry replacement, steel cage production and installation, joint treatm...

AI Technical Summary

Problems solved by technology

[0003] There are three types of joints commonly used in China: one is the circular joint pipe process, which is used in various parts of the country and has the longest use time and mature technology. However, due to the influence of various factors, the water-stop effect is not generally recognized. Its The use process is to put the two ends or one end of the groove section before clearing the hole in the groove section, and after pouring the concrete and initial setting, use a pipe puller or a super-large crane to pull up the joint pipe; the second method is used in the Guangdong area I-steel joint technology, that is, steel plates of a certain thickness are welded into an I-shape similar to the steel cage of the continuous wall, and placed symmetrically at both ends of the first-stage slot joint, and the second-stage slot must be on the adjacent side of the two sides. Construction can only be carried out after the completion of the slotted concrete. This method has the disadvantages of concrete bypass, one joint seepage channel becomes two, high cost, waste of materials, and the water stop is still not ideal, and it is not a green construction method. Its The process is to weld steel plates into I-shaped welded I-beams, fix the secondary I-beams on both sides of the reinforcement cage of the underground diaphragm wall, and hoist them together with the reinforcement cages into the groove section with a large crane, and then pour the underwater concrete Finally, the I-beam is left on the joint of the groove section; the third is the construction process of the cross steel plate constructed in the Shanghai area, which is complicated and costly. Compared with the circular pipe joint, the concrete joint is not a semicircle but a vertical On the joint plane of the continuous wall axis, in the middle of the joint plane, vertically place a steel plate for water-stop function perpendicular to this plane. Before pouring concrete, put the water-stop steel plate and the joint box together on the joint of the groove section. The joint box is equipped with The inflatable pipe to prevent the concrete from flowing around. After the underwater concrete is poured and solidified, the inflatable pipe is deflated and the parts of the joint box are lifted out of the ground

[0004] Since the rubber waterstop joint is an excellent form of concrete joint waterstop, the rubber flexible waterstop joint of the underground diaphragm wall has been used in foreign countries, and the Kumagai Group of Japan has used it in the construction of the underground diaphragm wall of Guangzhou CITIC Plaza. The practice of using rubber water-stop plates on the joints of underground diaphragm walls in foreign countries is to use a joint plate like Larsen III and IV steel sheet piles. The back of the joint plate is covered with steel plates and forms a wing plate roughly equal to the width of the groove section. The connectors are connected by bolts to the required length. Its construction process is that the connectors are assembled on the ground and installed with rubber belts, then hoisted into the groove section, clear the holes, lower the reinforcement cage, pour underwater concrete, excavate For the adjacent groove section, remove the connector. Its use conditions are: the end face of the excavated groove section must be square. Secondly, the joint plate must be removed after the next groove section is excavated. The time interval for removal is long. In addition, the removal The method must be to squeeze out with a special wedge, and cannot be directly pulled up by pulling construction. When dismantling, use a manual jack and use a steel key to peel the connector from the concrete joint surface of the underground diaphragm wall from top to bottom like a broken bamboo, and weld the steel key On the underground diaphragm wall grab (a heavy equipment for excavating the slot section). Its disadvantage is that it has low rigidity and can only be removed after the excavation of the adjacent new slot section. Due to slow progress and other reasons, the strength of concrete has grown to a relatively high level (more than 50% of the design strength can be reached in 3 days), this method of demolition will be more difficult, and many such connectors will be prepared, and the cost will also increase.

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