On-line control method for application of prestress of steel support of deep foundation pit
A prestressed, steel support technology, used in excavation, infrastructure engineering, construction, etc., can solve the problems of damage to the side wall of the foundation pit, non-axial compression safety, inaccurate application, etc., to improve the safety factor of the foundation pit, The effect of increasing the safety factor
Active Publication Date: 2019-06-07
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology
[0009] According to the deficiencies of the prior art above, the present invention provides a deep foundation pit steel support online control method for applying prestress, which can effectively solve the problem of damage to the side wall of the foundation pit due to excessive prestress loading in the prior art or that cannot be monitored in real time due to prestress The adjustment leads to the problem that the loss of prestress cannot be discovered and supplemented in time, and the unevenness of the pit wall easily leads to the non-axial compression of the steel support during installation, resulting in huge safety hazards and inaccurate prestress application
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Embodiment 1
[0052] Such as Figure 1 ~ Figure 3 As shown, the deep foundation pit steel support online control applying prestressing method according to the present invention, the specific implementation steps include:
[0053] (1) Before the purlin hanging plate 1 is installed, ink lines are used to pop up the axis on the surface of the purlin hanging plate 1 at both ends of the bearing steel support 2, and the center position A of the purlin hanging plate 1 is located. The end face also pops up the central axis with the ink line, and locates the center position B;
[0054] (2) Install the purlin hanging plate 1, hoist the steel support 2 to the required support position, and ensure that the center position A and the center position B coincide;
[0055] (3) Adsorb the static level device 21 on the steel support 2, with reference to the static level device 21, adjust the position of the steel support 2 to make it level;
[0056] This can ensure that the steel support 2 is installed on t...
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The invention belongs to the field of architectural engineering, and especially relates to an on-line control method for application of prestress of a steel support of a deep foundation pit. Central positions are drawn up on board surfaces of enclosing purlin hanging plates and end faces of both ends of the steel support, installation of the steel support is performed by a manner of aligning the central positions with each other, the steel support is adjusted to be in a horizontal position by referring to a hydrostatic level device disposed on the steel support, the steel support is ensured tobe mounted on a same axis, so that the steel support is in a shaft center compression state; reverse propellers are disposed between a movable end of each of steel supports and the enclosing purlin hanging plates, so that real-time monitoring of the prestress of each of the steel supports and remote real-time control of loading or unloading of the prestress are achieved; and through adoption of amanner of increasing the prestress at the steel support to 80% and then increasing to 100%, and the prestress at all the steel supports is sequentially added to 100% of a design value step by step. The method enables the damage degree of the sidewall of the foundation pit by the application of the prestress to be reduced to the lowest, and simultaneously enables the safety factor of the foundation pit to be greatly improved.
Description
technical field [0001] The invention belongs to the field of construction engineering, and in particular relates to a method for applying prestress under on-line control of deep foundation pit steel supports. Background technique [0002] At present, jacks are used to apply prestress on the foundation pit engineering site. When the prestress value is applied, wedges are used to fill the gaps at the movable end of the steel support after the prestress is applied. This technology has the following disadvantages: [0003] (1) It is difficult to achieve compaction by using wedges to fill the gap at the movable end of the steel support. Therefore, after the jack is removed, the loss of prestress is obvious; [0004] For example, China has published a patent "a control device for applying steel support prestress in deep foundation pits" (publication number: CN106381875B). The wedge is used to fill the gap at the movable end, which has changed the traditional method of filling the...
Claims
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IPC IPC(8): E02D17/02E02D17/04
Inventor 袁长丰袁子晋于浩杰
Owner QINGDAO TECHNOLOGICAL UNIVERSITY