Butt joint reinforced concrete foundation with anchor hardware parts

 

(57) Abstract:

The invention relates to the construction, namely, the butt joints of precast concrete structures, mainly working in conditions of high heat, intense dynamic and cyclic loads, and can be used, for example, to connect the elements of frame building frames, frame reinforced concrete foundations of the turbines and other power equipment, as well as for repair and strengthening. Joint connection includes a supporting part, the supporting structure of the Foundation, the concrete seminolecounty supporting part and a gap between the abutting faces and the Foundation bolts in the right areas. New is the fact that the supporting part in the middle of the transverse and longitudinal sides respectively provided with transversely and longitudinally-diagonal axisymmetric anchors and surface transverse abutting sides of the Foundation and the supporting part of the outside of the center axes of Foundation bolts are connected by a concrete seminolecounty and temperature expansion joints of low-modulus material with a thickness of 1-2 mm, with Foundation bolts, arranged in end-to-end wells, zamonolichennyj on a portion of its length of at least what Cliveti and increase the fracture toughness of the joints of the supporting parts with reinforced concrete Foundation with temperature and other influences. 2 C.p. f-crystals, 5 Il.

The invention relates to the field of construction, namely, the butt joints of precast concrete structures, mainly working in conditions of high heat, intense dynamic and cyclic loads, and can be used, for example, to connect the elements of frame building frames, frame reinforced concrete foundations of the turbines and other power equipment, as well as for repair and strengthening.

Known reinforced concrete design of beams containing the external armature, made in the form of transverse rods mounted on horizontal surfaces primarnych sections with plates and longitudinal rods, a connecting plate, and the top face primarnych plots made with vertical ledges under plates (ed. mon. N 987062, E 04 G 23/02; E 04 C 3/293). The disadvantage of this design is the lack of hardness and crack resistance.

A well-known Foundation for equipment containing bottom plate, vertical racks supported on the bottom plate and AMERICANIA with her binder, and an upper structure with beams and longitudinal beams, also americanme binder, in which ustave connection of precast concrete elements, includes interconnected reinforcing editions of the abutting faces and concrete monolithic gap between them (ed. mon. N 1350282, E 04 B 1/38, 1/66). To increase the fracture toughness and hardness of the concrete poured in places of contact with the abutting faces between the safety issues formed curved grooves filled with cement-sand mortar to bend the cement.

As in the previous, the disadvantage of this connection when using it in the joints of the base of the turbine foundations are invalid their passivity and lack of fracture toughness when process temperature influences steam turbine during operation.

The closest technical solution to the declared object is butt joint reinforced concrete Foundation with anchor hardware parts, including a supporting part in the form of a metal plate, porniness design of the Foundation, the concrete seminolecounty supporting part and a gap between the abutting faces of the connected elements and the Foundation bolts (ed.mon. N 1157313, F 16 M 5/00, 7/00).

However, at elevated temperatures, and especially when uneven heating in butt joints such design is their work.

The material of connected elements (metal bearing parts and equipment concrete anchor-bearing structures of the Foundation) are very different from each other thermophysical characteristics, so their heating and cooling are accompanied by an increase of temperature gradients on their contact with the concrete seminolecounty and the corresponding increase in shift effort, especially at elevated and uneven heating of one of these elements (concrete or metal). The temperature expansion of the United elements becomes asymmetric on the surfaces they contact and disordered when the accepted way of fixing Foundation bolts. As a result of this greatest displacement and relative displacement of the contacting surfaces occur on more pliable longitudinal ends of the connected elements, and less pliable, their edges remain necesaarily. The initial mutual centering of connected elements is disturbed and causes disruption of the normal operating conditions of the equipment.

The basis of the offer of the invention is reduce flexibility and increase the fracture toughness of the joints of the supporting parts is equipped with the, what in the butt connection of concrete Foundation with anchor hardware parts, mainly proveu turbine, comprising a supporting part in the form of a hollow metal plate, the bearing construction of foundations, concrete, seminolecounty basic part of the gap between the abutting faces of the connected elements and the Foundation bolts in the right areas, according to the invention the supporting part in the middle of the transverse and longitudinal sides respectively provided with transversely and longitudinally-diagonal axisymmetric anchors and surface transverse abutting sides of the Foundation and the supporting part of the outside of the center axes of Foundation bolts are connected by a concrete seminolecounty and temperature expansion joints of low-modulus material with a thickness of 1-2 mm, when this Foundation bolts located through the wells, zamonolichennyj, on a portion of its length not less than 15 diameters of their rods.

Another feature of the coupling is that the concrete seminolecounty gap between the abutting edges on the longitudinal sides made with airborne elements in the form of hanging on the side faces of the supporting-bearing structure of the Foundation of the benches placed in the elements of angular profiles on the longitudinal sides of the frame as fixtures provided with diagonally-rod anchors, released from the concrete seminolecounty supporting part and a gap between the abutting faces of connected elements, as well as from the supporting structure of the Foundation.

In addition, in connection the gap between the abutting faces of connected elements, the supporting part of the equipment and closed frame zamonolichennyj the steel fibre concrete to bend the cement.

Location transversely and longitudinally-diagonal anchors in the middle respectively transverse and longitudinal sides of the bearing parts provides a balance of thermal expansion and shear forces at the contact surfaces of connected elements with respect to their geometric axes. In such cases, the anchors act as fixpunkt of thermal expansion of the support parts, so shifting efforts and the corresponding shifts are ordered, close in distribution to axisymmetric and decrease in value to two times. As a result, the crack of a butt-joint at the contact becomes higher than in the well-known butt connection.

Mutually inclined and symmetrical position of the anchors in the geometric axes allows us to perceive the alternating horizontal loads and joining in R. the quantum of connected elements (truss analogy). Longitudinal - and transverse-diagonal anchors are encouraged to actively engage in the event of exhaustion of the limit of stability of the relative position of connected elements and their displacement in the plane of contact, immediately switches on and shutting off communication). Due to the vertical components of the efforts of anchors increasing the compression of the contact is able to prevent mutual displacement of connected elements and thereby to maintain the stability of their position. In moments include anchors in the work to the extent applicable, is reduced automatically give a butt-joint.

Temperature expansion joints outside the center axes of Foundation bolts on the transverse sides and Foundation bolts, zamonolichivanie on the length of the pass-through wells, remove the sharp increase in thrust supporting-bearing structure of the Foundation by brief heating of the metal supporting part and to prevent its growth due to the increase in time irreversible part of the deflection of the supporting-bearing structure of the Foundation. Because of the different thermo-physical and physical-mechanical characteristics of the metal and concrete of the supporting part is warming faster support-bearing structure on nasonia elements of the joint as a result of shutdowns and manifestations of creep of concrete under dynamic loads in the bearing-supporting structure accumulate over time, permanent deformation of the trough.

Temperature expansion joints and zamonolichivanie on length of Foundation bolts eliminate the possibility of pinching the end of the support part in these phenomena, minimize thrusts and thereby contribute to ensuring the compatibility of deformations of elements of a butt-joint on the contact surfaces and a corresponding increase compliance and reduce the fracture, preventing their separation.

Equipment concrete seam in the gap between the abutting faces of the side element with overhanging ledge on the edge of the supporting-bearing structure of the Foundation can increase the area of contact surfaces of the connected elements and to provide the perception of alternating horizontal loads, and due to the diagonal reinforcement rod anchors to prevent tearing of the contact at the edges from heat and swelling (of curvature) of the reference-bearing structure of the Foundation. In addition, thanks to the concrete ledge seam and contact with them is protected against the penetration of oil and steam in case of emergency occurring leaks. Increase the area of contact and connection on the longitudinal sides of the seam of her dockable elements increases crack resistance and reduces flexibility of the joint.

Externally reinforced side elements on the longitudinal sides, combined with the same fittings on the transverse sides of the concrete seam on the top face of the supporting-bearing member, to form a closed loop frame, which is necessary for perception and containment of spreading the use of concrete seminolecounty seam to bend the cement. By limiting the expansion of hardening concrete mixture to bend the cement with the help of this frame in the seam creates a process samonapryazhennye and the corresponding increase in fracture toughness.

The essence of joint is illustrated by drawings, where Fig. 1 shows the scheme of joint supporting part of the equipment of a steam turbine with a concrete Foundation on Fig. 2 is a view along I-I of Fig. 3 - elements of the construction joint of Fig. 1, is a view along II-II of Fig. 4 is a view along III-III of Fig. 5 is a view along IV-IV.

Joint connection of the equipment 1 includes a supporting part in the form of a hollow metal plate 2, TNA is mi a and B connected elements 2, 3 and Foundation bolts 6 in the right areas. The supporting part 2 in the middle of the transverse and longitudinal G sides respectively provided with transversely and longitudinally-diagonal axisymmetric anchors 7 and 8. Surface transverse abutting sides of the Foundation and the bearing parts outside the center axes of Foundation bolts 6 are connected to temperature expansion joints 9 of the low-modulus material with a thickness of 1-2 mm Foundation bolts 6 are arranged in end-to-end wells 10 and zamonolichennyj on a portion of its length not less than 15 diameters of their rods.

The concrete seminolecounty gap 5 on the longitudinal sides are made with side elements 11 in the form of hanging on the side faces of the supporting-bearing structure of the Foundation of the benches placed in the elements 12 angular profile, closed on the transverse sides In zamonolichivanie concrete into the frame. The elements 12, as embedded plate, provided with diagonally-rod anchors 13, 14, released from the concrete seminolecounty support parts 2 and 15, is released from the supporting structure of the Foundation 3.

Joint connection works as follows.

Joint connection with temperature effects due to asiantribune location of raccon the Nations on the contact surfaces of the supporting part of the equipment and the supporting structure of the Foundation, but due to device temperature expansion joints, seminolecounty Foundation bolts on the length of the supporting part extends in the longitudinal direction without hesitation deformations without creating thrust.

When the temperature and the alternating power impacts and dynamic loads on the joint connection, thanks to the device of the ledges and the reinforcement of their oblique reinforcement in the form of anchors, as well as the use of steel fibre concrete as a material seminolecounty gap between the joined elements and the supporting part, ensures the consistency of the deformation at the contact of the articulating surfaces of the supporting part and the supporting structure with steel fibre concrete, seminolecounty.

The set of distinctive features of the proposed joint provides increased crack resistance and decreased compliance due to the fact that they are determined mainly by the resistance and material properties of seminolecounty connected elements - steel fibre concrete to bend the cement.

Improving the crack resistance of the joint is achieved by the creation of three dimensional stress state in supporting the seam between abutting joined granese reinforced side element.

The use of steel fibre concrete to bend the cement gives a butt connection additional properties: compensation of shrinkage of concrete, durability (abrasion resistance contacts), reducing temperature gradients in the direction of the three coordinates in space, active inclusion and effectiveness in the work material seminolecounty joint - fibre concrete to bend the cement - SWF NTS.

Industrial applicability.

Joint connection can be used when upgrading the supporting joints steam electric turbine high power 60-1200 MW, as well as during routine repairs of operating turbines and their foundations on the electrical and thermal power plants with the purpose of normalization of thermal expansion turbines and ensuring the operational status of foundations, increase the mobility of units and ensure the safety of their operation, including prevention of emergency situations in the system of the turbine - Foundation - base.

1. Butt joint reinforced concrete Foundation with anchor hardware parts, mainly steam turbine, comprising a supporting part and a gap between the abutting faces of the connected elements and the Foundation bolts in the corner areas, characterized in that the supporting part in the middle of the transverse and longitudinal sides respectively provided with transversely and longitudinally-diagonal axisymmetric anchors and surface transverse abutting sides of the Foundation and the supporting part of the outside of the center axes of Foundation bolts are connected by a concrete seminolecounty and temperature expansion joints of low-modulus material with a thickness of 1-2 mm, with Foundation bolts, arranged in end-to-end wells, zamonolichennyj on a portion of its length not less than 15 diameters of their rods.

2. Connection on p. 1, characterized in that the concrete seminolecounty gap between the abutting edges on the longitudinal sides made with airborne elements in the form of hanging on the side faces of the supporting-bearing structure of the Foundation of the benches placed in the elements of the angular profile, which closed on the transverse sides zamonolichivanie concrete frame, with the elements of the profile angle on the longitudinal sides of the frame as fixtures provided with diagonally-rod anchors, released from the concrete seminolecounty supporting part and a gap between the abutting faces of the connected elements, and the supporting structure of the Foundation.

part of the equipment and closed frame zamonolichennyj the steel fibre concrete to bend the cement.

 

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