Prestressed steel beam releasing and tensioning device, concrete beam tensioning device and construction method

Abstract

The invention relates to the field of concrete beam construction, in particular to a prestressed steel beam releasing and tensioning device, a concrete beam tensioning device and a construction method.The prestressed steel beam releasing and tensioning device comprises a plurality of positioning devices, and each positioning device is provided with a plurality of first through holes; the tension releasing device further comprises a jacking device, a plurality of second through holes are formed in the jacking device, and the jacking device can drive the second through holes to move vertically. The jacking device is provided with a jacking posture enabling the second through hole and the first through hole to be staggered and a releasing posture enabling the second through hole and the first through hole to be coaxial, and the jacking device is adjusted to be in the jacking posture, so that the end, located in the second through hole, of the prestressed steel beam moves upwards, and the end, located in the first through hole, of the prestressed steel beam is released. In this way, a certain stroke can be reserved for follow-up tension releasing, the jacking device is adjusted to the releasing posture in the follow-up process, the prestressed steel beam can gradually release the tension force in the process, and the situation that the tension force is suddenly released in a cutting method, and consequently impact is too large, and a concrete beam is damaged is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of concrete tensioning, in particular to a prestressed steel bundle tensioning device, a concrete beam tensioning device and a construction method. Background Art

[0002] When prefabricating concrete beams using the existing long-line method, the length of the prestressed steel bundles in the pre-tensioning method is usually longer, usually reaching the level of hundreds of meters. During the tensioning and bundling process of the prestressed steel bundles, due to their heavy deadweight, the prestressed steel bundles are prone to sag effect, which affects the linear stability of the prestressed steel bundles. In addition, the tensioning force required for the prestressed steel bundles during the tensioning process is large. When the linear shape of the prestressed wire bundles is unstable, the prestressed steel bundles are prone to entanglement. In addition, release is required after tensioning is completed. Traditional release methods mostly use cutting methods, which directly cut the steel bundles to achieve the purpose of releasing the tensioning force. However, since the prestressed steel bundles are too long and require a large tensioning force, releasing the tensioning force by cutting will instantly release the tensioning force in a short period of time, causing the prestressed steel bundles to shrink, thereby causing an impact effect, affecting the quality of the concrete beam and causing safety hazards to construction personnel. Summary of the invention

[0003] The purpose of the present invention is to provide a prestressed steel bundle tensioning device, a concrete beam tensioning device and a concrete beam construction method in order to address the problems that the prestressed steel bundle has a heavy deadweight and is prone to sag effect, causing the prestressed steel bundle to become entangled, and that the traditional cutting method is used to release the prestressed steel bundle, which is prone to impact effect, affecting the quality of the concrete beam and posing a threat to the safety of construction workers.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a prestressed steel strand tensioning device, comprising a plurality of positioning devices, wherein the positioning devices are provided with a plurality of first through holes;

[0006] The tensioning device further includes a lifting device, on which a plurality of second through holes are provided, and the lifting device can drive the second through holes to perform vertical displacement;

[0007] The lifting device has a lifting posture that makes the second through hole and the first through hole achieve misalignment, and a releasing posture that makes the second through hole and the first through hole achieve coaxiality.

[0008] A prestressed steel strand tensioning device of the present application is used on a segmented concrete beam, and the tensioning device is provided on two adjacent segments.

[0009] The present invention relates to a prestressed steel bundle tensioning device. The prestressed steel bundle is passed through a second through hole on a jacking device and a first through hole on a positioning device, thereby limiting the prestressed steel bundle through the first through hole and the second through hole, thereby reducing the sag effect caused by the excessive weight of the prestressed steel bundle, thereby ensuring the linear shape of the prestressed steel bundle; and by adjusting the jacking device to a jacking posture, the second through hole is driven to move, so that the first through hole and the second through hole are misaligned, so that a section of the prestressed steel bundle located in the second through hole moves with the second through hole, so that a certain stroke can be reserved for subsequent tensioning. Subsequently, the jacking device is adjusted to a releasing posture to ensure that the second through hole is concentric with the first through hole. In this process, the prestressed steel bars in the second through hole are tensioned through the reserved stroke in the jacking posture, so that the prestressed steel bundle gradually releases the tensioning force within the reserved stroke, avoiding the sudden release of the tensioning force as in the cutting method, resulting in excessive impact to damage the concrete beam, and affecting the quality of the concrete beam and threatening the safety of on-site construction personnel.

[0010] As a preferred solution of the present invention, the positioning device includes positioning plates that are relatively arranged, anchor pieces are connected below the positioning plates, and each of the positioning plates is provided with the first through hole.

[0011] As a preferred solution of the present invention, the spacing between the relatively arranged positioning plates ranges from 200 mm to 600 mm.

[0012] By setting the anchors, the positioning device can withstand the reaction force generated by the prestressed steel strands during the tensioning process, ensuring that the positioning device will not be offset, thereby affecting the linear shape of the prestressed steel strands.

[0013] As a preferred embodiment of the present invention, the lifting device includes a lifting part, the lifting part is connected to the anchor, an extension plate is provided at the upper end of the lifting part, the extension plate is located between the relatively arranged positioning plates, and the second through hole is opened on the extension plate.

[0014] By setting the extension plate between the two positioning plates, when the jacking device is working, the extension plate pushes the prestressed steel bundle upward. At this time, since the positioning plate does not move, the positioning plates at both ends of the extension plate are used as fulcrums to share the force applied by the extension plate to the prestressed steel bundle, thereby ensuring the stability of the force.

[0015] In a second aspect, a concrete beam tensioning device comprises the above-mentioned prestressed steel strand tensioning device, and also comprises a supporting device arranged relatively, wherein the supporting device is used to fix a concrete beam composed of a plurality of main beams arranged at intervals;

[0016] The supporting device includes a first anchoring device and a second anchoring device, the first anchoring device is connected to the prestressed steel bundle, the first anchoring device is located between the second anchoring device and the first anchoring device; the first anchoring device is connected to the second anchoring device.

[0017] The present invention is a concrete beam tensioning device. By connecting a first anchoring device with a prestressed steel bundle, the prestressed steel bundle can transmit the tensioning force to the first anchoring device during tensioning, and the first anchoring device is connected to a second anchoring device, so as to effectively control the stress state of the prestressed steel bundle, reduce the prestress loss caused by displacement or slippage during the tensioning process, and improve the tensioning accuracy; the concrete beam is fixed by relatively arranged supporting devices to ensure that the concrete beam remains stable during the tensioning process.

[0018] As a preferred solution of the present invention, the first anchoring device includes a first anchor pier, an anchor plate is hinged above the first anchor pier, and the anchor plate is connected to the prestressed steel bundle.

[0019] The anchor plate is hinged to the first anchor pier, so that the anchor plate can be deflected within a certain range, so that the anchor plate can automatically adjust the force direction when subjected to force. A pull rod is hinged on the anchor plate. The anchor plate is hinged to the first anchor pier and the anchor plate to buffer the force impact during tensioning.

[0020] As a preferred solution of the present invention, the second anchoring device includes a second anchor pier, a support column is connected above the second anchor pier, and a pull rod is hinged between the support column and the anchor plate.

[0021] By hingedly connecting one end of the tie rod to the support column, the anchor plate can rotate through the hinge with the first anchor pier after being subjected to the horizontal force applied by the prestressed steel bundle. At the same time, since one end of the tie rod is hinged to the support column and the other end is hinged to the anchor plate, the anchor plate deflects and drives the tie rod to move. The force applied to the anchor plate can be transmitted smoothly by hingedly connecting the two ends of the tie rod to the support column and the fixed plate.

[0022] As a preferred embodiment of the present invention, a first hinge point is provided on the anchor plate, one end of the pull rod is hinged to the anchor plate through the first hinge point, a second hinge point is provided on the support column, the other end of the pull rod is hinged to the support column through the second hinge point, and the first hinge point is located in the area above the second hinge point.

[0023] Since the first hinge point is higher than the second hinge point and the tie rods are distributed at an angle, the tension of the prestressed steel strands can be more reasonably transferred to the supporting structure, reducing additional bending moment and stress concentration, improving force uniformity, and optimizing the force transmission method to reduce fatigue damage to the anchor plates and support columns, thereby improving the durability of the overall structure, reducing equipment maintenance and replacement costs, and extending service life.

[0024] As a preferred solution of the present invention, the prestressed steel strand tensioning device is arranged between two adjacent main beams.

[0025] As a preferred embodiment of the present invention, a pedestal is provided under the main beam, the pedestal is located above the foundation, the foundation is connected to the positioning device and the jacking device, the foundation is provided with an extended foundation, the supporting device is connected to the extended foundation, and the first anchor pier and the second anchor pier are both located in the extended foundation.

[0026] By installing both the positioning device and the jacking device on the foundation, the connection stability of the positioning device and the jacking device can be ensured, and the prestressed steel bundle can be prevented from breaking away from the positioning device and the jacking device due to excessive tensioning force during tensioning, thereby preventing the structure from failing. In addition, an extended foundation is also provided on the foundation, and the supporting device is connected to the extended foundation. A larger bearing capacity is provided through the extended foundation. When the prestressed steel bundle is tensioned, a vertical force is generated. At this time, the pull-out resistance provided by the supporting device and the extended foundation can effectively alleviate the vertical force generated during tensioning.

[0027] The difference between the foundation and the extended foundation in this application is that the extended foundation is a form of foundation enhancement, mainly used to improve the bearing capacity and optimize the force, while the foundation is a natural or artificially treated soil layer that provides overall support. The extended foundation increases the structure's anti-pullout and anti-settlement capabilities by expanding the load-bearing area and improving load distribution.

[0028] In a third aspect, the present invention further provides a method for constructing a concrete beam, using the above-mentioned concrete beam tensioning device, the method comprising:

[0029] S1. Pass the prestressed steel strands through the positioning device and the jacking device in sequence;

[0030] S2, connecting the two ends of the prestressed steel tendon to the supporting device;

[0031] S3, adjusting the lifting device to a lifting posture and performing tensioning;

[0032] S4. After tensioning is completed, adjust the lifting device to the release posture and release the tension.

[0033] The present invention discloses a method for constructing concrete beams. Prestressed steel bundles are sequentially passed through a positioning device and a lifting device, so that when the prestressed steel bundles are connected in series with various main beams, the positioning device can be used to reduce the sag effect caused by their own weight to ensure their own linear shape. The lifting posture and release posture of the lifting device can also be used to reduce the impact force generated during subsequent tensioning, thereby ensuring the quality of the concrete beam and the safety of the construction workers. Support devices are installed at both ends of the concrete beam to support the concrete beam. When the prestressed steel bundles are tensioned, horizontal reaction forces will be generated. By installing support devices at both ends of the concrete beam, the horizontal reaction forces can be transmitted and reduced.

[0034] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0035] 1. The present invention is a prestressed steel bundle tensioning device, which limits the prestressed steel bundle through the first and second through holes by passing the prestressed steel bundle through the second through hole on the jacking device and the first through hole on the positioning device, thereby reducing the sag effect caused by the excessive weight of the prestressed steel bundle, thereby ensuring the linear shape of the prestressed steel bundle; and by adjusting the jacking device to a jacking posture, the second through hole is driven to move, so that the first through hole and the second through hole are misaligned, so that a section of the prestressed steel bundle located in the second through hole moves with the second through hole, so that a certain stroke can be reserved for subsequent tensioning, and subsequently the jacking device is adjusted to a releasing posture to ensure that the second through hole is concentric with the first through hole. In this process, the prestressed steel bars in the second through hole are tensioned through the reserved stroke in the jacking posture, so that the prestressed steel bundle gradually releases the tensioning force within the reserved stroke, avoiding the sudden release of the tensioning force as in the cutting method, resulting in excessive impact to damage the concrete beam, and affecting the quality of the concrete beam and threatening the safety of on-site construction personnel.

[0036] 2. The present invention is a concrete beam tensioning device, which connects the first anchoring device with the prestressed steel bundle so that the prestressed steel bundle can transfer the tensioning force to the first anchoring device during tensioning, and connects the first anchoring device with the second anchoring device, thereby effectively controlling the stress state of the prestressed steel bundle, reducing the prestress loss caused by displacement or slippage during the tensioning process, and improving the tensioning accuracy; the concrete beam is fixed by relatively arranged support devices to ensure that the concrete beam remains stable during the tensioning process.

[0037] 3. The present invention is a method for constructing concrete beams. By sequentially passing the prestressed steel bundles through a positioning device and a jacking device, the prestressed steel bundles can reduce the sag effect caused by their own weight through the positioning device when connecting the main beams in series, thereby ensuring their own linear shape. The lifting posture and release posture of the jacking device can also reduce the impact force generated during subsequent tensioning, thereby ensuring the quality of the concrete beam and the safety of the construction workers. Support devices are installed at both ends of the concrete beam to support the concrete beam. When the prestressed steel bundles are tensioned, horizontal reaction forces will be generated. By installing support devices at both ends of the concrete beam, the horizontal reaction forces can be transmitted and reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the concrete beam of the present invention connected with the supporting device and the tensioning device;

[0039] Figure 2 It is a schematic diagram of the connection structure between the positioning device and the jacking device of the present invention;

[0040] Figure 3 is a schematic structural diagram of a positioning device of the present invention;

[0041] Figure 4 It is a structural schematic diagram of the jacking device of the present invention;

[0042] Figure 5 It is a schematic diagram of a top view of the structure of the connection between the positioning device and the lifting device of the present invention;

[0043] Figure 6 is a schematic structural diagram of a support device of the present invention;

[0044] Figure 7 It is a flow chart of the construction method of the present invention.

[0045] Icons: 1-positioning device; 11-anchor; 12-positioning plate; 121-first through hole; 2-lifting device; 21-lifting part; 22-extension plate; 221-second through hole; 3-supporting device; 31-first anchoring device; 311-first anchor pier; 312-anchor plate; 3121-first hinge point; 32-second anchoring device; 321-second anchor pier; 322-support column; 3221-second hinge point; 4-main beam; 5-pedestal; 6-foundation; 7-extended foundation; 8-pull rod. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0047] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are based on the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation of the present invention.

[0048] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0049] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0050] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0051] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0052] Example 1

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 A prestressed steel strand tensioning device shown in the figure comprises a positioning device 1, and the positioning device 1 is provided with a first through hole 121 for the prestressed steel strand to pass through, and also comprises a jacking device 2, the jacking device 2 is also provided with a second through hole 221 for the prestressed steel strand to pass through, the first through hole 121 and the second through hole 221 are concentrically arranged, and the jacking device 2 itself has two postures, including a jacking posture that makes the second through hole 221 and the first through hole 121 realize misalignment. This posture is performed before the prestressed steel strand is tensioned, and the second through hole 221 is lifted so that the second through hole 221 is located at the second through hole 221. Part of the prestressed steel strands in the tension beam move, thereby reserving a travel for subsequent tensioning, and also including restoring the second through hole 221 and the first through hole 121 to a concentric release posture. This posture is performed in the tensioning stage after the tensioning is completed. By resetting the position of the second through hole 221, the prestressed steel strand is reset through the reserved travel. Such a structure reduces the impact force generated by the prestressed steel strand during tensioning, and avoids the traditional cutting method directly cutting off the prestressed steel strand after tensioning, thereby instantly generating a large impact force, causing damage to the concrete beam and threatening the safety of construction workers.

[0054] Furthermore, the positioning device 1 includes a pair of relatively arranged anchors 11, and each anchor 11 is provided with a positioning plate 12, a first through hole 121 is located on the positioning plate 12, and the jacking device 2 is arranged between two adjacent positioning plates 12, the jacking device 2 includes a jacking portion 21, an extension plate 22 is provided on the jacking portion 21, and a second through hole 221 is provided on the extension plate 22. By arranging the jacking portion 21 between adjacent anchors 11, the extension plate 22 is located between the two positioning plates 12, so that when the jacking device 2 is working, the extension plate 22 pushes the prestressed steel bundle to move upward. At this time, since the positioning plate 12 does not move, the positioning plates 12 located at both ends of the extension plate 22 are used as fulcrums to share the force applied by the extension plate 22 to the prestressed steel bundle, thereby ensuring the stability of the force.

[0055] In the present application, the number of the first through holes 121 and the number of the second through holes 221 are both greater than or equal to two.

[0056] The present invention is used in the prefabrication stage of a concrete beam, which includes a plurality of main beams 4 arranged at intervals, a positioning device 1 and a jacking device 2 are provided between two adjacent main beams 4, a prestressed steel bundle connects the plurality of main beams 4 in series, and the prestressed steel bundle between two adjacent main beams 4 is fixed by the positioning device 1. Since the prestressed steel bundle is long and heavy, the prestressed steel bundle between two adjacent main beams 4 is easily affected by its own weight and has a sag effect, thereby affecting its own linear shape. The prestressed steel bundle is limited by the first through hole 121, so that the linear shape of the prestressed steel bundle can be ensured; when tensioning is required, the construction personnel will jack up the device 1. The device 2 is adjusted to the jacking posture, driving the extension plate 22 to move upward. At this time, the prestressed steel bundle is driven to move through the second through hole 221, and a stroke is reserved for the subsequent tensioning, so that the prestressed steel bundle can be reset. When the tensioning starts, the construction personnel adjust the jacking device 2 to the releasing posture. At this time, the extension plate 22 is gradually reset and drives the prestressed steel bundle to move along the reserved stroke through the second through hole 221, so that the prestressed steel bundle can slowly release the tensioning force, avoiding the direct cutting of the prestressed steel bundle by the traditional cutting method, so that the tensioning force is released instantly, causing impact to damage the concrete beam and threatening the construction personnel.

[0057] Example 2

[0058] like Figure 1 and Figure 6 A concrete beam tensioning device shown includes a prestressed steel bundle tensioning device of Example 1, and also includes a relatively arranged support device 3, the support device 3 is used to fix a concrete beam composed of a plurality of spaced main beams 4, the support device 3 includes a first anchoring device 31 and a second anchoring device 32, the first anchoring device 31 is connected to the prestressed steel bundle, and the first anchoring device 31 is located between the second anchoring device 32 and the first anchoring device 31; the first anchoring device 31 is connected to the second anchoring device 32, and the connection between the first anchoring device 31 and the prestressed steel bundle enables the prestressing steel bundle to transfer the tensioning force to the first anchoring device 31 during tensioning, and the first anchoring device 31 and the second anchoring device 32 are connected, so as to effectively control the stress state of the prestressed steel bundle, reduce the prestress loss caused by displacement or slippage during tensioning, and improve the tensioning accuracy; the concrete beam is fixed by the relatively arranged support device 3 to ensure that the concrete beam remains stable during tensioning.

[0059] In one or more embodiments, the first anchoring device 31 comprises a first anchor pier 311, an anchoring plate 312 is hinged on the first anchor pier 311, the anchoring plate 312 is connected to the prestressed steel strand, and the anchoring plate 312 is hinged to the first anchor pier 311, so that the anchoring plate 312 can be deflected within a certain range, so that the anchoring plate 312 can automatically adjust the force direction when subjected to force, and a tension rod 8 is hinged on the anchoring plate 312, and the anchoring plate 312 is hinged to the first anchor pier 311 and the anchoring plate 312 to buffer the force impact during tensioning;

[0060] Furthermore, the second anchoring device 32 includes a second anchor pier 321, and a support column 322 is connected above the second anchor pier 321. A pull rod 8 is hinged between the support column 322 and the anchor plate 312. By hingedly connecting one end of the pull rod 8 to the support column 322, the anchor plate 312 can rotate through the hinge connection with the first anchor pier 311 after being subjected to the horizontal force applied by the prestressed steel bundle. At the same time, since one end of the pull rod 8 is hinged to the support column 322 and the other end is hinged to the anchor plate 312, the anchor plate 312 deflects and drives the pull rod 8 to move. The hinge connection of the two ends of the pull rod 8 to the support column 322 and the fixed plate allows the force on the anchor plate 312 to be transmitted smoothly. Figure 1 and Figure 6 shown.

[0061] In one or more embodiments, a first hinge point 3121 is provided on the anchor plate 312, one end of the pull rod 8 is hinged to the anchor plate 312 through the first hinge point 3121, a second hinge point 3221 is provided on the support column 322, the other end of the pull rod 8 is hinged to the support column 322 through the second hinge point 3221, the first hinge point 3121 is located in the area above the second hinge point 3221, since the first hinge point 3121 is higher than the second hinge point 3221, the pull rod 8 is inclinedly distributed, so that the tension of the prestressed steel bundle is more reasonably transmitted to the supporting structure, reducing additional bending moment and stress concentration, and improving force uniformity. By optimizing the force transmission method, the fatigue damage of the anchor plate 312 and the support column 322 is reduced, the durability of the overall structure is improved, the equipment maintenance and replacement costs are reduced, and the service life is prolonged. Figure 1 and Figure 6 shown.

[0062] In one or more embodiments, a prestressed steel bundle tensioning device is arranged between two adjacent main beams 4, a pedestal 5 is arranged below the main beam 4, the pedestal 5 is located above a foundation 6, the foundation 6 is connected to the positioning device 1 and the jacking device 2, the foundation 6 is provided with an extended foundation 7, the support device 3 is connected to the extended foundation 7, the first anchor pier 311 and the second anchor pier 321 are both located in the extended foundation 7, by installing the positioning device 1 and the jacking device 2 on the foundation 6, the connection stability of the positioning device 1 and the jacking device 2 can be ensured, and the position or the tensioning force is too large during tensioning, so that the prestressed steel bundle can be prevented from breaking away from the positioning device 1 and the jacking device 2, resulting in structural failure; and an extended foundation 7 is also arranged on the foundation 6, the support device 3 is connected to the extended foundation 7, and a larger bearing capacity is provided by the extended foundation 7. When the prestressed steel bundle is tensioned, a vertical force is generated. At this time, the pull-out resistance provided by the support device 3 and the extended foundation 7 can effectively alleviate the vertical force generated during tensioning, such as Figure 1 and Figure 6 shown.

[0063] The difference between the foundation 6 and the extended foundation 7 in this application is that the extended foundation 7 is a form of foundation reinforcement, mainly used to improve the bearing capacity and optimize the force, while the foundation 6 is a natural or artificially processed soil layer that provides overall support. The extended foundation 7 improves the load distribution by expanding the load-bearing area and enhancing the anti-pullout and anti-settlement capabilities of the structure.

[0064] Example 3

[0065] like Figure 7 The construction method of a concrete beam shown in the embodiment 2 adopts the construction method of a concrete beam, and the method comprises:

[0066] S1. First, it is necessary to arrange the positioning device 1 and the lifting device 2 between the adjacent main beams 4 to ensure that the prestressed steel strands will not have a sag effect due to their own weight, and to ensure the linear shape of the prestressed steel strands in subsequent construction;

[0067] S2, passing the prestressed steel strand from the first main beam 4 through the positioning device 1 and the jacking device 2 to the next main beam 4, until several main beams 4 are connected in series;

[0068] S3, installing the support device 3 at both ends of the concrete beam, and then performing tensioning and releasing. Before releasing, the jacking device 2 is adjusted to the jacking posture. After the tensioning is completed, the jacking device 2 is adjusted to the releasing posture;

[0069] S4. Complete the construction.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed steel tendon tensioning device, characterized in that: It comprises a plurality of positioning devices (1), wherein the positioning devices (1) are provided with a plurality of first through holes (121); The tensioning device further comprises a lifting device (2), wherein the lifting device (2) is provided with a plurality of second through holes (221), and the lifting device (2) is capable of driving the second through holes (221) to perform vertical displacement; The lifting device (2) has a lifting posture that enables the second through hole (221) and the first through hole (121) to be misaligned, and a releasing posture that enables the second through hole (221) and the first through hole (121) to be coaxial.

2. A prestressed steel strand tensioning device according to claim 1, characterized in that: The positioning device (1) comprises positioning plates (12) arranged opposite to each other, an anchor (11) being connected below the positioning plates (12), and each positioning plate (12) is provided with the first through hole (121).

3. The prestressed steel strand tensioning device according to claim 2, characterized in that: The spacing between the positioning plates (12) arranged opposite to each other ranges from 200 mm to 600 mm.

4. The prestressed steel strand tensioning device according to claim 3, characterized in that: The lifting device (2) comprises a lifting part (21), the lifting part (21) is connected to the anchor (11), an extension plate (22) is provided at the upper end of the lifting part (21), the extension plate (22) is located between the positioning plates (12) arranged opposite to each other, and the extension plate (22) is provided with the second through hole (221).

5. A concrete beam tensioning device, characterized in that: A prestressed steel strand tensioning device according to any one of claims 1 to 4, further comprising a supporting device (3) arranged relatively to each other, wherein the supporting device (3) is used to fix a concrete beam composed of a plurality of main beams (4) arranged at intervals; The supporting device (3) comprises a first anchoring device (31) and a second anchoring device (32), wherein the first anchoring device (31) is connected to the prestressed steel bundle, and the first anchoring device (31) is located between the second anchoring device (32) and the first anchoring device (31); the first anchoring device (31) is connected to the second anchoring device (32).

6. A concrete beam tensioning device according to claim 5, characterized in that: The first anchoring device (31) comprises a first anchor pier (311), an anchoring plate (312) is hinged above the first anchor pier (311), and the anchoring plate (312) is connected to the prestressed steel strand.

7. A concrete beam tensioning device according to claim 6, characterized in that: The second anchoring device (32) comprises a second anchor pier (321), a support column (322) is connected above the second anchor pier (321), and a pull rod (8) is provided between the support column (322) and the anchoring plate (312).

8. A concrete beam tensioning device according to claim 7, characterized in that: The anchor plate (312) is provided with a first hinge point (3121), and one end of the pull rod (8) is hinged to the anchor plate (312) via the first hinge point (3121); a second hinge point (3221) is provided on the support column (322), and the other end of the pull rod (8) is hinged to the support column (322) via the second hinge point (3221); the first hinge point (3121) is located in the area above the second hinge point (3221).

9. A concrete beam tensioning device according to any one of claims 5 to 8, characterized in that: The prestressed steel strand tensioning device is arranged between two adjacent main beams (4).

10. A method for constructing a concrete beam, characterized in that: Using a concrete beam tensioning device as described in any one of claims 5 to 9, the method comprises: S1, passing the prestressed steel strand through the positioning device (1) and the lifting device (2) in sequence; S2, connecting the two ends of the prestressed steel strand to the supporting device (3); S3, adjusting the lifting device (2) to a lifting posture and performing tensioning; S4. After the tensioning is completed, the lifting device (2) is adjusted to a release posture and the tensioning is released.

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