SU897963A1 - Device for static testing of piles - Google Patents

Description

one

The invention relates to construction and is intended for testing pile foundations.

The known installation for static testing of piles, including a thrust beam, a jack and grips interacting with anchor piles, will accept the grippers made in the form of holders with liners fixed on the beam and equipped with power cylinders with spring-loaded rods communicating with the working cavity of the jack 1.

The disadvantages of this installation include the complexity of the manufacture and operation of hydraulic grippers and the lack of versatility, since the details of the grippers must lie on the surface of the anchor piles, which may have different geometrical parameters ..

The closest technical solution to the invention is a plant for static testing of piles,

including a thrust beam supported on a jack, mounted on the ends of the beam through ball joints, traction devices with grippers connected to reinforcing anchors of anchor 5 piles 2.

The disadvantage of this installation is the limited possibility of covering the reinforcing protrusions of the anchor piles, for example, if they are ramming piles that can have more than four reinforcing protrusions, and their height can be no more than 20 cm.

The purpose of the invention is to improve the reliability of work and the range of coverage.

Claims (2)

This goal is achieved by the fact that in a known installation for static testing of piles, including a thrust beam supported on a jack, mounted on the ends of the beam through ball joints, the pull fittings with grippers connected to the reinforcing protrusions of the anchor pile are each made in the form the power frame with a bearing disc at its lower end is equipped with a cable-blocking system with upper and lower rows of blocks, with the upper axles fixed on the power frame, and the grips are suspended from the lower axes of the blocks. Each grip is made in the form of an obama with clamping screws and wedges having the possibility of a longitudinal-vertical displacement relative to each other. FIG. 1 shows the installation, general view; in fig. 2 — node I in FIG. 1, in FIG. 3 grip, longitudinal section; in fig. A — section A – D in FIG. 3 The described installation for static testing of piles consists of up to crater 1, mounted on the test pile 2, thrust beam 3, on which the power frames are suspended for 5 seconds. bearing discs 6, grippers 7, which are mounted with on reinforcing rods x 8 anchor piles 9, and cable 10, stored between blocks 11 of grippers 7 and blocks of 12 shafts 13, radially located on supporting disks 6. Gripper 7 includes a trough-shaped holder 1 4 with a hole 15 in the bottom for passing the reinforcing bar 8. Inside the cage 1, there are: a fixed wedge 16, longitudinally displaced with screws 17 CL / 1H 18 and a spring-loaded wedge 19 with a notch 20. On the axis 21 a block 11 is installed for cable 10 and force washers 22. Block undercut width 11 is due to the alignment of the cable 10 and the armature rods 8 with their different diameters. The installation works as follows. I install a jack 1 on the test pile 2 and mount the thrust beam 3 with the power frames 5, to which the grippers 7 are suspended by means of the cable block system. The grippers 7 are mounted on the reinforcing rods 8 of the anchor piles 9 to choose the slack of the cable 1Q and fix it. With the help of the screw 17, the reinforcement bars 8 are preliminarily clamped between the wedges 19 and the static test of the pile is started. When lifting the support beam 3, and, consequently, of the power frames 5, the reinforcing bars 8 are wedged between the wedges 19, perceived equal load, which is transferred by means of the cable block system from the support beam 3. After the testing, the screws 17 are brought to the initial position, and by means of strikes on the yoke 1, the reinforcing bars 8 are released. The installation of the gripper on each rod allows the use of any anchor systems, which is especially important when they are made not in factory conditions, but on site. With a sufficiently frequent arrangement of the shafts on the bearing discs and the corresponding lengths of them, the same construction can be used for anchor piles of different diameters with different diameters of reinforcing bars. The distribution of forces between the reinforcing rods of anchor piles using a trunnion system increases the reliability of the installation, since their size is the same for all the rods, even with their different curvatures. Claim 1. An installation for static testing of piles, including a thrust beam supported on a jack, mounted at the ends of the beam through ball joints, traction devices with grippers associated with rebar anchors of the anchor piles, characterized in that, in order to improve reliability Each traction device is made in the form of a power frame with a supporting disc at its lower end and is equipped with a cable-block system with upper and lower rows of blocks, with the upper axes of the blocks fixed to the power frame, and to the lower m Grips axes suspended blocks. 2. The installation according to claim 1, characterized in that each gripper is made in the form of a cage with clamping screws and wedges having the possibility of a longitudinal-vertical displacement relative to each other. Sources of information taken into account in the examination 1. USSR author's certificate number 690128, cl. E 02 D 33/00, 1978. 2. USSR author's certificate for application number 2760975 / 29-33, cl. E 02 D 33/00, 1979.  T