Unilateral linear composite prestressed concrete volute capable of being tensioned again

Abstract

The utility model discloses a unilateral linear composite prestressed concrete volute capable of being tensioned again, which comprises a concrete volute, a flow channel, a water inlet middle pier, a volute inlet side pier, a fixed anchor cable and an anchor cable capable of being tensioned again. The water inlet middle pier is located at the front end of a water inlet of the concrete volute, the volute inlet side pier is located at the inlet end of a flow channel, the fixed anchor cable and the re-stretchable anchor cable are both located in the volute inlet side pier and are linearly arranged at intervals, and the fixed anchor cable comprises an anchoring section, an anchor cable steel strand and a fixed anchor head. The device is used for solving the problem that the structural strength and anti-seepage requirements are difficult to meet due to the fact that a large riverbed type plant concrete volute is complex in body shape, prominent in stress characteristic and limited by water flow conditions in structural form, and a solution is provided for the design of the large riverbed type plant concrete volute in the future.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical direction of water conservancy and hydropower engineering, and particularly relates to a single-edge straight-line-shaped composite prestressed concrete spiral case capable of being tensioned again. BACKGROUND

[0002] For a low-head large-flow riverbed type power station, an axial flow type hydro-generator set is usually adopted, and the set has the characteristics of large operation water head amplitude variation, large runner diameter and large spiral case body size. For example, the reinforced concrete spiral case of Gezhouba Dam Hydropower Station has a maximum net width of 31.2 m at the inlet and a maximum net height of 15.85 m. For a large power station, the use of a steel spiral case requires a large amount of steel material, and the economy is relatively poor. Therefore, a reinforced concrete spiral case is the preferred spiral case structure type. The reinforced concrete spiral case has the characteristics of complex structure and concentrated water head loss. Therefore, it is extremely important to optimize the spiral case body shape, and the structure is required to be reasonable and the stress state is required to be good; the water flow is required to be smooth, and the water head loss is required to be small; and the spiral case is required to be convenient for formwork erection and steel bar installation.

[0003] The reinforced concrete spiral case structure has a complex body shape and prominent stress characteristics. The structure form is limited by the water flow condition, and the form and size can be changed and selected in a very small space. The crack control is relatively strict, which brings great difficulties to the structural design and reinforcement design. In order to meet the crack limitation requirement of the spiral case, a large amount of steel bars need to be configured for the structure, and the construction is difficult, and the quality of the concrete pouring is difficult to guarantee. In order to reduce the amount of spiral case reinforcement, a prestressed reinforced concrete spiral case can be used to reduce the amount of spiral case reinforcement, simplify the construction, and be beneficial to the pouring of the spiral case concrete; at the same time, the prestressed reinforced concrete spiral case improves the stress properties of the structure, changes the spiral case side wall from a partial tension member to a partial compression member, and thus meets the strength and anti-seepage requirements of the structure.

[0004] The spiral case has a large body size and a complex structure. If the entire concrete spiral case is all used with prestressed anchor cables, the engineering quantity and investment will be greatly increased, and the stress loss problem of the anchor cables in operation needs to be considered. Since the loss of steel strands is limited, if all the anchor cables are used with the prestressed anchor cables, the engineering quantity and investment will be increased and wasted. Therefore, how to design a prestressed concrete spiral case that meets the structural use requirement and durability requirement and saves investment has become a problem that needs to be discussed and exchanged by personnel in this technical field. UTILITY MODEL CONTENTS

[0005] The utility model aims at the existing technology and proposes a single-edge straight-line-shaped composite prestressed concrete spiral case capable of being tensioned again to solve the problems in the background technology.

[0006] To solve the above technical problems, the utility model provides technical scheme as follows: A single side straight line shape can be tensioned again composite prestressed concrete volute, including concrete volute, flow channel, water inlet middle pier, volute import edge pier, fixed anchor cable and can be tensioned again anchor cable, the hollow part of concrete volute is flow channel, the water inlet middle pier is located concrete volute water inlet front end part, the volute import edge pier is located flow channel entrance end part, the fixed anchor cable and can be tensioned again anchor cable are all located volute import edge pier inside, and it is linearly spaced arrangement, the fixed anchor cable includes anchoring section, anchor cable steel strand and fixed anchor head, the can be tensioned again anchor cable includes anchoring section, anchor cable steel strand, movable anchor head and dynamometer.

[0007] Further, the fixed anchor cable and the can be tensioned again anchor cable are linearly arranged in the volute import edge pier, and the fixed anchor cable and the can be tensioned again anchor cable are spaced apart, and the distance between the two anchor cables is 1.5m-2.5m.

[0008] Further, the fixed anchor cable is vertically arranged, the anchoring section is located at the bottom of the volute import edge pier, and the fixed anchor head is located at the top of the volute import edge pier.

[0009] Further, the can be tensioned again anchor cable is vertically arranged, the anchoring section is located at the bottom of the volute import edge pier, the movable anchor head is located at the top of the volute import edge pier, the dynamometer is located below the movable anchor head and is arranged adjacent to the movable anchor head.

[0010] Further, the fixed anchor cable and the can be tensioned again anchor cable are arranged in the range from the end of the volute import edge pier to the center line of the machine set, and the fixed anchor cable is arranged at both ends.

[0011] The hollow part of the concrete volute is a flow channel, the water inlet middle pier is located at the front end of the water inlet of the concrete volute, the volute import edge pier is located at the entrance end of the flow channel, and the fixed anchor cable and the can be tensioned again anchor cable are both located inside the volute import edge pier and are linearly spaced apart. The fixed anchor cable includes an anchoring section, an anchor cable steel strand, and a fixed anchor head. The can be tensioned again anchor cable includes an anchoring section, an anchor cable steel strand, a movable anchor head, and a dynamometer.

[0012] Compared with the prior art, the utility model achieves the following beneficial effects: according to the stress characteristics of the large-scale axial flow machine set concrete volute, the horizontal tensile stress of the volute import edge pier is small, and the stress problem is solved by reinforcement, and the vertical tensile stress is large. The utility model can effectively improve the stress condition of the volute structure, limit the development of volute cracks, and reduce the amount of volute reinforcement, while meeting the condition of tensioning again due to the loss of anchoring force in the later period, saving engineering quantity and investment. The utility model provides a solution for the design of large-scale riverbed type plant axial flow machine set concrete volute in the future. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application. In the drawings:

[0014] Fig. 1 It is a whole effect picture of the present application;

[0015] Fig. 2 It is a plane arrangement drawing of the fixed anchor cable and the re-tensionable anchor cable;

[0016] Fig. 3 It is an elevation view of the fixed anchor cable and the re-tensionable anchor cable.

[0017] In the drawings: 1, concrete spiral case; 2, flow passage; 3, middle pier of water inlet; 4, edge pier of spiral case inlet; 5, fixed anchor cable; 6, re-tensionable anchor cable; 7, anchoring section; 8, anchor cable steel strand; 9, fixed anchor head; 10, movable anchor head; 11, dynamometer. DETAILED DESCRIPTION

[0018] The technical scheme of the present application will be further and non-restrictively described in detail in combination with preferred embodiments and drawings thereof. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Please refer to Figs. 1-3 The present application provides a technical scheme: a single-side straight-line-shaped re-tensionable composite prestressed concrete spiral case, which comprises a concrete spiral case 1, a flow passage 2, a middle pier 3 of water inlet, an edge pier 4 of spiral case inlet, a fixed anchor cable 5 and a re-tensionable anchor cable 6. The hollow part of the concrete spiral case 1 is the flow passage 2. The middle pier 3 of water inlet is located at the front end of the water inlet of the concrete spiral case 1. The edge pier 4 of spiral case inlet is located at the inlet end of the flow passage 2. The fixed anchor cable 5 and the re-tensionable anchor cable 6 are both located inside the edge pier 4 of spiral case inlet and are arranged in a straight-line-shaped interval. The fixed anchor cable 5 comprises an anchoring section 7, an anchor cable steel strand 8 and a fixed anchor head 9. The re-tensionable anchor cable 6 comprises an anchoring section 7, an anchor cable steel strand 8, a movable anchor head 10 and a dynamometer 11.

[0020] Furthermore, the fixed anchor cable 5 and the re-tensionable anchor cable 6 are arranged in a straight-line shape inside the edge pier 4 of spiral case inlet, and the fixed anchor cable 5 and the re-tensionable anchor cable 6 are arranged in an interval. The interval between the two anchor cables is 1.5m-2.5m.

[0021] Furthermore, the fixed anchor cable 5 is arranged vertically, the anchoring section 7 is located at the bottom of the edge pier 4 of spiral case inlet, and the fixed anchor head 9 is located at the top of the edge pier 4 of spiral case inlet.

[0022] Further, the re-tensionable anchor cable 6 is vertically arranged, the anchoring segment 7 is located at the bottom of the spiral case inlet side pier 4, the movable anchor head 10 is located at the top of the spiral case inlet, and the load cell 11 is located below the movable anchor head 10 and close to the movable anchor head 10.

[0023] Further, the fixed anchor cable 5 and the re-tensionable anchor cable 6 are arranged in the range from the end of the spiral case inlet side pier 4 to the center line of the machine set, and the fixed anchor cable 5 is arranged at both ends.

[0024] The hollow part of the concrete spiral case 1 is the flow passage 2, the water inlet middle pier 3 is located at the front end of the water inlet of the concrete spiral case 1, the spiral case inlet side pier 4 is located at the inlet end of the flow passage 2, the fixed anchor cable 5 and the re-tensionable anchor cable 6 are both located inside the spiral case inlet side pier 4 and arranged in a straight line in a spaced manner. The fixed anchor cable 5 comprises an anchoring segment 7, an anchor cable steel strand 8 and a fixed anchor head 9; the re-tensionable anchor cable 6 comprises an anchoring segment 7, an anchor cable steel strand 8, a movable anchor head 10 and a load cell 11.

[0025] One specific application of the embodiment is that the hollow part of the concrete spiral case 1 is the flow passage 2, the water inlet middle pier 3 is located at the front end of the water inlet of the concrete spiral case 1, the spiral case inlet side pier 4 is located at the inlet end of the flow passage 2, the fixed anchor cable 5 and the re-tensionable anchor cable 6 are both located inside the spiral case inlet side pier 4 and arranged in a straight line in a spaced manner, the fixed anchor cable 5 comprises an anchoring segment 7, an anchor cable steel strand 8 and a fixed anchor head 9; the re-tensionable anchor cable 6 comprises an anchoring segment 7, an anchor cable steel strand 8, a movable anchor head 10 and a load cell 11.

[0026] With the operation of the project, if the value of the load cell 11 is less than the original design value, the re-tensionable anchor cable 6 needs to be tensioned again in time, and since the re-tensionable anchor cable 6 and the fixed anchor cable 5 are arranged in a spaced manner, the tensioning force needs to be increased to compensate for the loss of the tensioning force of the fixed anchor cable 5 during the secondary tensioning. By arranging the fixed anchor cable 5 and the re-tensionable anchor cable 6 in a spaced manner on one side of the spiral case inlet side pier 4, the stress problem of the large-scale axial flow machine set reinforced concrete spiral case 1 is solved, which is superior to the original simple reinforced concrete spiral case 1 scheme.

[0027] The second example of the embodiment is that according to the finite element calculation results of the spiral case, if the required prestress of the spiral case inlet side pier 4 is small, the influence of the loss of the anchor cable stress on the spiral case structure is also small, and then two fixed anchor cables 5 and one re-tensionable anchor cable 6 can be arranged for every three anchor cables to save the engineering quantity and investment.

[0028] In the description of the utility model, need understanding is, the term "upper", "lower", "front", "back", "left", "right" and so on indicated orientation or position relation is based on the orientation or position relation shown in the drawing, only is for the convenience of describing the utility model, and is not indicating or suggesting the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore can not be understood as the limitation to the utility model.

[0029] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, but not limit them. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A single-side straight linear re-tensionable composite prestressed concrete spiral case, comprising a concrete spiral case (1), a flow passage (2), a water inlet middle pier (3), a spiral case inlet side pier (4), a fixed anchor cable (5) and a re-tensionable anchor cable (6), characterized in that: The hollow part of the concrete spiral case (1) is a flow passage (2), the water inlet pier (3) is located at the front end of the water inlet of the concrete spiral case (1), the spiral case inlet side pier (4) is located at the inlet end of the flow passage (2), the fixed anchor cable (5) and the re-tensionable anchor cable (6) are both located inside the spiral case inlet side pier (4) and are arranged in a straight line and spaced apart, the fixed anchor cable (5) comprises an anchoring section (7), an anchor cable steel strand (8) and a fixed anchor head (9), the re-tensionable anchor cable (6) comprises an anchoring section (7), an anchor cable steel strand (8), a movable anchor head (10) and a dynamometer (11).

2. The single-side straight linear post-tensionable composite pre-stressed concrete spiral case according to claim 1, characterized in that: The fixed anchor cable (5) and the re-tensionable anchor cable (6) are arranged in a straight line inside the spiral case inlet side pier (4) and are spaced apart, and the distance between the two anchor cables is 1.5m-2.5m.

3. The single-side straight linear post-tensionable composite pre-stressed concrete spiral case according to claim 1, characterized in that: The fixed anchor cable (5) is arranged vertically, the anchoring section (7) is located at the bottom of the spiral case inlet side pier (4), and the fixed anchor head (9) is located at the top of the spiral case inlet side pier (4).

4. The single-side straight linear post-tensionable composite pre-stressed concrete spiral case according to claim 1, characterized in that: The re-tensionable anchor cable (6) is arranged vertically, and the anchoring section (7) is located at the bottom of the spiral case inlet side pier (4).

5. The single-side straight linear post-tensionable composite pre-stressed concrete spiral case according to claim 1, characterized in that: The movable anchor head (10) is located at the top of the spiral case inlet, and the dynamometer (11) is located at the lower part of the movable anchor head (10) and is arranged close to the movable anchor head (10).

6. The single-side straight linear post-tensionable composite pre-stressed concrete spiral case according to claim 1, characterized in that: The arrangement range of the fixed anchor cable (5) and the re-tensionable anchor cable (6) is from the end of the spiral case inlet side pier (4) to the center line of the machine set, and the fixed anchor cable (5) is arranged at both ends.

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