DE3110920C2 - Method for anchoring the bottom of an underwater structure against buoyancy - Google Patents

Description

40

30th

The invention relates to a method for anchoring the bottom of an underwater body against buoyancy with _{ground anchors protruding from the water above the water level and protruding from the water, which are pretensioned by means of jacks} that can be operated from a steering position above the water .

The sole of a structure to be produced under water, e.g. B. one in an open design The tunnel to be created must before the lowering of the water above the floor against the one below Buoyancy forces must be secured.

In this known method for producing an underwater concrete base secured against buoyancy According to DE-PS 20 22 787, the tension piles serving as ground anchors are after manufacture built into the underwater concrete base and over a supporting against the underwater concrete base Tensioning chair tensioned with a tensioning press arranged above the water level. The angry Prestressing is then applied against the underwater concrete base by turning a nut underwater using it a special key from the work platform.

This method requires complex convertible support structures with which the jack over Water is propped up against the base of the structure, and it is only possible with ground anchors with a threaded head applicable.

With knowledge of the previously existing disadvantages, the invention is based on the object of securing an underwater concrete base from above the water level from ground anchors inserted through it to clamp and anchor in a simple manner against the surface of the underwater concrete base.

The task is accomplished with the process steps indicated in the characterizing part of the patent claims solved.

The method according to the invention has the advantage that the prestressing and anchoring of the ground anchors at the bottom of the underwater structure without diverting the supporting forces to above the water level and can be carried out directly on the base of the building without the auxiliary structures required for this.

The invention is illustrated below with reference to an embodiment shown in the drawing represents. It shows

F i g. 1 a section through the excavation and

F i g. 2 is a side view of the clamping head.

The pit is limited by sheet piling 1 and the concrete base 2 of the structure, which was brought under water. Ground anchors 3 are in the usual way by the Concrete base 2 passed through and anchored in the ground. A pressure distribution plate 4, a clamping head 5 for wedge anchoring with inserted wedges 6 and one Clamping jacks 7 are pushed onto a ground anchor 3 and are connected to one another, for example by means of binding wire 8 connected in such a way that the binding wire must tear open during pretensioning.

For this purpose, the binding wire 8 is inserted between the pressure distribution plate 4 and the one that extends during the pretensioning Part 9 of the clamping jack 7 is arranged. The clamping jack 7 is connected to a rope 10 with which it is common with the attached pressure distribution plate 4 and the clamping head 5 along the ground anchor 3 except for the Surface of the concrete base 2 is drained. All of the functions required for tensioning the ground anchor 3 Tensioning press 7 such as the hooking of the ground anchor 3, the tensioning of the ground anchor 3, the pressing in of the wedges 6 in the clamping head 5 and the subsequent loosening of the holding of the ground anchor 3 are carried out by an over Water-arranged steering position 11 switched off. Then the jack 7 with the rope 10, with the the jack is connected via pressure hoses 15, pulled up over water and as described on the next ground anchor implemented. For lining the pressure distribution plate 4, an annular, Jute bag 12 filled with cement is lowered over the ground anchor 3 onto the surface of the concrete base 2 (FIG. 2). When tensioning the ground anchor 3, this jute bag 12, into which water can penetrate, between the Concrete base 2 and the pressure distribution plate 4 are crushed and thus compensates for any existing ones Unevenness on the surface of the concrete base 2. To compensate for such unevenness, a spherical anchor head 13, which is mounted in a pan 14, can be used.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. A method for anchoring the sole of an underwater structure against buoyancy from above the water level through the sole _; Ground anchors protruding out of the water which are brought through into the subsoil and are prestressed by means of clamping jacks which can be operated from a control station located above the water, characterized in that a pressure distribution plate (4), a clamping head (5) for wedge anchors with loosely inserted wedges (6) and one in all functions remotely controllable clamping jack (7) on the protruding over water part of each ground anchor (3) pushed and releasably connected to each other a t5, then lowered together by means of a rope (10) on the underwater _{concrete floor (2), that then from the control station} (11) from the clamping and wedging of the ground anchor (3) takes place and then the clamping jack (7) is released from the clamping head (5) and that then the clamping jack (7) is pulled up again above the water level. 2. The method according to claim 1, characterized in that before the discharge of the pressure distribution plate (4) an annular, cement-filled, 5 Jute bag (12) over the ground anchor (3) on the surface of the Betonsoh! -; (2) is drained.