A vertical prestressed member and construction method thereof

Abstract

The present application relates to the field of building construction, and in particular to a vertical prestressed component, comprising a concrete component, a bellows arranged in the concrete component, a tensioning assembly arranged in the bellows and applying prestress to the concrete component, a grouting pipe arranged in the concrete component and connected to the bellows for grouting in the bellows, the concrete component being provided with a fixed support rod, the support rod being provided with a middle plug-in pipe that can be tightly inserted into the bellows, the middle plug-in pipe being fixedly connected with a rubber pad that can be tightly attached to the surface of the bellows, the grouting pipe being tightly inserted into the end of the middle plug-in pipe away from the bellows, the support rod being provided with a support portion that is attached to the lower surface of the grouting pipe, so that both the grouting pipe and the middle plug-in pipe are supported, making it difficult for a large amount of concrete to penetrate between the rubber pad and the bellows and between the grouting pipe and the middle plug-in pipe, so as to facilitate subsequent grouting into the bellows.

Description

Technical Field

[0001] The present application relates to the field of building construction, and in particular to a vertical prestressed member and a construction method thereof. Background Art

[0002] Concrete components are prone to cracks when subjected to tension, which affects the quality of the concrete components. In order to improve the tensile capacity of concrete components, tensioned prestressed tendons are set in the concrete components to make prestressed components. The entire prestressed component is subjected to a certain pressure after manufacturing. When the prestressed component is subjected to external pressure during actual use, the shrinkage force of the prestressed tendons will be offset first, and then the prestressed component will be subjected to tension.

[0003] Most of the existing prestressed components adopt the post-tensioning bonding construction method, that is, the concrete component is first cast into shape, and a corrugated pipe is embedded in the concrete component to form a prestressed hole, and a hole is opened on the surface of the corrugated pipe and an arc-shaped pressure plate with a mouth is used to tie the corrugated pipe with steel wire, and a pipe is connected to the mouth of the arc-shaped pressure plate to form a grouting hole. Then the prestressed tendons pass through the prestressed holes and are tensioned. The two ends of the tensioned prestressed tendons are sealed with anchors, and then grouting is carried out through the grouting holes, so that the prestressed tendons and concrete components are connected as one, and finally a prestressed component is formed.

[0004] Regarding the above-mentioned related technologies, in vertical prestressed components, the pipe connecting the mouth of the arc pressure plate is horizontal and easily affected by the impact of falling concrete during pouring. A certain gap is likely to appear at the connection between the arc pressure plate and the corrugated pipe or between the mouth of the arc pressure plate and the pipe, which will allow concrete to enter the grouting hole, affecting the subsequent smooth grouting into the prestressed hole, and reducing the overall forming rate of the prestressed component. Summary of the Invention

[0005] In order to prevent the overall forming speed of the prestressed component from being greatly affected, the present application provides a vertical prestressed component and a construction method thereof.

[0006] In a first aspect, the present application provides a vertical prestressed member adopting the following technical solution.

[0007] A vertical prestressed component includes a concrete component, a corrugated pipe arranged in the concrete component, a tensioning assembly arranged in the corrugated pipe and applying prestress to the concrete component, and a grouting pipe arranged in the concrete component and connected to the corrugated pipe for grouting in the corrugated pipe. The concrete component is provided with a fixed support rod, the support rod is provided with a middle plug that can be tightly inserted into the corrugated pipe, the middle plug is fixedly connected to a rubber pad that can be tightly attached to the surface of the corrugated pipe, the grouting pipe is tightly inserted into the end of the middle plug away from the corrugated pipe, and the support rod is provided with a support portion that fits the lower surface of the grouting pipe.

[0008] By adopting the above technical solution, the middle insert is supported vertically by the support rod, and the grouting pipe is supported vertically by the support part, so that during the pouring of concrete on the upper part of the concrete component, the middle insert and the grouting pipe are difficult to move at will, and the concrete slurry is not easy to enter the grouting pipe and the corrugated pipe near the grouting pipe in large quantities, so that the concrete slurry fed through the grouting pipe can smoothly enter the corrugated pipe, and there is no need to spend a lot of time to clear the grouting pipe, so as to improve the overall forming efficiency of the prestressed component.

[0009] Optionally, the outer wall of the grouting pipe is provided with a limit block abutting against the support portion, the surface of the limit block away from the grouting pipe is inclined, and the inclined surface of the limit block close to the grouting pipe is away from the corrugated pipe.

[0010] By adopting the above technical solution, the depth of the grouting pipe inserted into the middle insert is not prone to significant changes, and the inclined surface of the limit block is set so that when the concrete falls onto the inclined surface of the limit block, the limit block tends to move toward the support part, so that the limit block is tightly attached to the support part.

[0011] Optionally, a connecting rod is sleeved on the bottom end of the support rod, the connecting rod is provided with a rod rack, the support rod is rotatably connected to a rack screw, and the rack screw is threadedly connected to a limiting rack that can engage with the rod rack.

[0012] By adopting the above technical solution, the height of the support rod can be adjusted to a certain extent, so that when the opening height of the corrugated tube changes, the height of the middle insert can also be adjusted accordingly.

[0013] Optionally, the concrete component includes a base plate for placing the bottom end of the support rod, a column provided on the upper surface of the base plate and for setting the corrugated pipe, the tensioning assembly includes a lower anchor provided in the base plate, an upper anchor provided at the upper end of the column, and a steel strand provided between the lower anchor and the upper anchor and anchored and tensioned, two lower angle steels are provided in the base plate, the lower anchor abuts against the two lower angle steels, the upper parts of the two lower angle steels are fixedly connected with semicircular inserts, the semicircular inserts are spliced ​​to form a complete round tube and are tightly inserted into the bottom end of the corrugated pipe, and the adjacent sides of the two lower angle steels are tightly attached to each other and to the steel strands.

[0014] By adopting the above technical solution, the lower anchor can be placed between the two lower angle steels, so that when the steel strand is subsequently tensioned, the lower anchor can abut against the two lower angle steels, and the interior of the completed base plate is less likely to be damaged, making the lower anchor more stable. The provision of the semicircular insert makes the connection between the corrugated pipe and the semicircular insert tighter, making it difficult for concrete to enter the corrugated pipe before the steel strand is tensioned, reducing the situation where a part of the steel strand cannot be fully tensioned, so that the entire large volume of the prestressed component after construction is completed can be relatively fully prestressed.

[0015] Optionally, each of the lower angle steels corresponds to a row of semicircular inserts, each row of semicircular inserts is fixedly connected to a pipe support rod, and the bottom end of the pipe support rod is fixedly connected to the lower angle steel.

[0016] By adopting the above technical solution, the corrugated pipe can be kept vertically better, and when the concrete of the column is injected, the corrugated pipe can maintain its shape better, so that when grouting is subsequently injected into the corrugated pipe, the steel strands can be fully wrapped with concrete slurry at all locations after tensioning.

[0017] Optionally, the bottom end of the support rod is slidably connected to the lower angle steel, and the adjacent sides of the two lower angle steels are fixedly connected with connecting plates, and the two connecting plates are detachably connected.

[0018] By adopting the above technical solution, the position of the support rod is determined, and the setting of the connecting piece makes it less likely for the position between the two lower angle steels to change relative to each other, so that the semicircular inserts set on the two lower angle steels can be better maintained stable.

[0019] Optionally, two upper angle steels are provided at the upper end of the column, the upper anchor can abut against the upper angle steels, and the upper parts of the two upper angle steels are far apart.

[0020] By adopting the above technical solution, the upper anchor is less likely to cause significant damage to the upper end of the column, and the flared setting between the two upper angle steels also makes it easier to set the upper anchor between the two upper angle steels. At the same time, the upper angle steel is less likely to move toward the lower anchor when it is subjected to a certain tension force of the steel strand.

[0021] Optionally, the semicircular insert with the highest height is provided with a clamping block for clamping the steel strand.

[0022] By adopting the above technical solution, after the corrugated pipe is installed, the steel strand can be clamped using a clamping block first, so that in subsequent work, there is no need to always apply external force to the steel strand to keep it tensioned, and the steel strand is not easy to fall and affect the progress of subsequent work.

[0023] Optionally, the clamping block is slidably connected to a semicircular insert, which is slidably connected to a pushing wedge that can push the clamping block toward the steel strand, and the width of the clamping block close to the steel strand is smaller than the width of the clamping block away from the steel strand.

[0024] By adopting the above technical solution, the wedge block is pushed in so that the clamping block can be pressed against the steel strand to facilitate the operation of the clamping block, and the width setting of the clamping block makes it difficult for the clamping block to cause excessive pressure on the steel strand.

[0025] In the second aspect, the present application provides a vertical prestressed component construction method adopting the following technical solution.

[0026] A vertical prestressed component construction method is used to construct the above-mentioned vertical prestressed component, and specifically includes the following steps.

[0027] Step 1: Install the steel bars inside the bottom plate, then pass the steel strand through the corrugated pipe, install the lower anchor at the bottom of the steel strand, and pre-embed the lower angle steel so that the lower angle steel is close to and pressed against the steel strand;

[0028] Step 2: Apply lubricant to the outer wall of the semicircular inserts, and then tightly fit the corrugated tube on the steel strand to the two rows of semicircular inserts. Then, tighten the clamping block to the steel strand, and tie the corrugated tube to each semicircular insert with steel wire.

[0029] Step 3: Connect the connecting rod to the lower angle steel, connect the middle plug to the corrugated pipe, and connect the grouting pipe to the middle plug, build the bottom plate formwork and pour concrete;

[0030] Step 4: The reinforcement of the column is set on the reserved reinforcement of the bottom plate, and then the formwork of the column is set up and concrete is poured;

[0031] Step 5: Remove the push wedge and tension the steel strand, then set the upper anchor and upper angle steel, then cut the steel strand, and then seal the anchor at the upper anchor.

[0032] By adopting the above technical solution, there is no need to spend a lot of time to clear the grouting pipe, so as to improve the overall forming efficiency of the prestressed component. At the same time, the released steel strands will not be cut until the tensioning is completed and the upper anchor is set. Compared with the traditional operation of first cutting the steel strands into longer lengths, then tensioning, and then cutting them, it can reduce the waste of steel strand scrap segments with too small lengths after multiple cutting of the steel strands.

[0033] In summary, this application has at least one of the following beneficial effects:

[0034] 1. No need to spend much time to dredge the grouting pipe, so as to improve the overall forming efficiency of the prestressed component;

[0035] 2. In subsequent work, there is no need to always apply external force to the steel strand to keep it taut, and the steel strand is not easy to fall and affect the progress of subsequent work. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of the cross-section of the base plate and columns in this application;

[0037] Figure 2 It will Figure 1 Schematic diagram of the structure with the middle bellows and an upper angle steel removed, and the support rod and connecting rod near one end partially cut away;

[0038] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0039] Explanation of the accompanying reference numerals: 1. Concrete member; 2. Bellows; 3. Tensioning assembly; 31. Clamping block; 32. Push wedge block; 33. Slide block; 34. Rack groove; 35. Arc mouth; 4. Grouting pipe; 41. Column; 42. Lower anchor; 43. Upper anchor; 44. Steel strand; 45. Lower angle steel; 46. Semicircular insert; 47. Support rod; 48. Connecting piece; 49. Upper angle steel; 5. Support rod; 51. Middle insert; 52. Rubber pad; 53. Support part; 54. Limit block; 55. Connecting rod; 56. Rod rack; 57. Rack screw; 58. Limit rack; 59. Base plate. DETAILED DESCRIPTION

[0040] The present application is further described in detail below with reference to the accompanying drawings.

[0041] The present application embodiment discloses a vertical prestressed member, referring to Figure 1 , including a concrete component 1, the concrete component 1 includes a base plate 59 and a column 41 cast on the base plate 59. Several columns 41 can be provided as needed. In this embodiment, one column 41 is provided for demonstration. A corrugated pipe 2 is pre-embedded in the column 41. The corrugated pipe 2 can be a plastic corrugated pipe. A tensioning component 3 for applying vertical prestress to the column 41 is installed in the corrugated pipe 2.

[0042] Reference Figure 1 and Figure 2 Two lower angle steels 45 are embedded in the bottom plate 59, and the horizontal section of the lower angle steel 45 is located at the upper end of the vertical section of the lower angle steel 45. The vertical sections of the two lower angle steels 45 are far away from each other. The bottom ends of the two vertical sections of the lower angle steels 45 are welded with horizontal connecting pieces 48, and the two connecting pieces 48 are positioned and connected by plugging. The tensioning assembly 3 includes a steel strand 44 passed through the corrugated pipe 2, an upper anchor 43 and a lower anchor 42 provided at the end of the steel strand 44, and several steel strands 44 can be arranged between the corresponding two upper anchors 43 and the lower anchor 42. In this embodiment, only one steel strand 44 is shown. The vertical sides of the two horizontal sections of the lower angle steels 45 are close to each other, and the sides of the two horizontal sections of the lower angle steels 45 are opened with arc openings 35. The inner wall of the arc opening 35 is close to the steel strand 44, and the lower anchor 42 can abut against the lower surface of the horizontal sections of the two lower angle steels 45.

[0043] Reference Figure 2A vertical support rod 47 is welded to the upper surface of the horizontal sections of the two lower angle steels 45. Each support rod 47 is fixedly connected to a row of semicircular inserts 46. Each row of semicircular inserts 46 is evenly spaced along the vertical direction. The end faces of the semicircular inserts 46 are fixedly connected to the support rod 47. The semicircular inserts 46 in the two rows are arranged in a corresponding manner, and the corresponding two semicircular inserts 46 can be spliced ​​to form a complete circular tube. The inner wall of the corrugated tube 2 is closely attached to the semicircular inserts 46. The bottom surface of the lowest semicircular insert 46 is fixedly connected to the upper surface of the horizontal section of the lower angle steel 45.

[0044] Reference Figure 2 The upper end width of the pushing wedge block 32 is greater than the width of the lower end of the pushing wedge block 32, so that the pushing wedge block 32 is not easy to extend excessively into the semicircular plug 46.

[0045] Reference Figure 2 and Figure 3 , a slide block 33 is integrally formed on the upper surface of a lower angle steel 45, and the slide block 33 is located in the bottom plate 59. The slide block 33 is connected to a vertical connecting rod 55 slidingly along the radial direction of the bellows 2. The connecting rod 55 is slidably connected to one end of the slide block 33 and is wedge-shaped. The upper end of the connecting rod 55 is plugged in and slidably connected to the support rod 5 in the vertical direction, and the bottom end of the support rod 5 is rotatably connected to a rack screw 57. The length direction of the rack screw 57 is consistent with the moving direction of the bottom end of the connecting rod 55 in the slide block 33. The rack screw 57 is located in the support rod 5 and is threadedly connected to a limiting rack 58 at one end. A vertical rack groove 34 is opened on the vertical side of the connecting rod 55. The rack groove 34 runs through the upper surface of the connecting rod 55, and a vertical rod rack 56 is fixedly connected in the rack groove 34. The limiting rack 58 is slidably connected to the inner wall of the rack groove 34 along the length direction of the rack screw 57 and engages with the rod rack 56.

[0046] Reference Figure 1 and Figure 2The upper end of the support rod 5 is fixedly connected to a horizontal middle pipe 51, which is tightly inserted into the corresponding opening of the corrugated pipe 2. The outer wall of the middle pipe 51 is fixedly connected to a rubber pad 52, which is arc-shaped to better fit the surface of the corrugated pipe 2. The inner wall of the middle pipe 51 away from the corrugated pipe 2 is tightly sleeved with a grouting pipe 4. The upper end of the support rod 5 is fixedly connected to a support portion 53, the upper surface of the support portion 53 is in contact with the outer wall of the grouting pipe 4, and the outer wall of the grouting pipe 4 is fixedly connected to a limit block 54. The limit block 54 abuts the vertical side of the support portion 53 away from the middle pipe 51. The outer wall of the limit block 54 is inclined, and the diameter of the inclined outer wall of the limit block 54 near the support portion 53 is larger than the diameter of the inclined outer wall of the limit block 54 away from the support portion 53. When concrete is poured into the column 41, the inclined surface of the limit block 54 is impacted and pressed against the support portion 53.

[0047] Reference Figure 1 and Figure 2 Two upper angle steels 49 are attached to the upper surface of the column 41. The upper angle steels 49 are pre-buried in the concrete block used to seal the upper anchor 43. The horizontal section of the upper angle steel 49 is located at the bottom end of the inclined section of the upper angle steel 49. The distance between the upper ends of the two inclined sections of the upper angle steel 49 is greater than the distance between the bottom ends of the two inclined sections of the upper angle steel 49. The upper anchor 43 abuts against the upper surfaces of the two horizontal sections of the upper angle steel 49. The distance between the two horizontal sections of the upper angle steel 49 is greater than the diameter of the steel strand 44.

[0048] The implementation principle of a vertical prestressed component in an embodiment of the present application is as follows: the middle insert 51 is vertically supported by the support rod 5, and the grouting pipe 4 is vertically supported by the support portion 53, so that blockage is unlikely to occur in the grouting pipe 4, and grouting can be smoothly performed into the corrugated pipe 2 through the grouting pipe 4.

[0049] The embodiment of the present application also discloses a vertical prestressed component construction method, which specifically includes the following steps.

[0050] Step 1: Install the internal steel bars of the bottom plate 59, then insert the steel strand 44 into the corrugated tube 2, install the lower anchor 42 at the bottom of the steel strand 44, and pre-embed the lower angle steel 45 so that the inner wall of the arc opening 35 is in close contact with and pressed against the steel strand 44;

[0051] Step 2: Apply lubricant to the outer wall of the semicircular insert 46. The lubricant can be neutral soapy water. Then, tightly fit the corrugated tube 2 on the steel strand 44 to the two rows of semicircular inserts 46. Then, clamp the block 31 tightly against the steel strand 44. Tie the corrugated tube 2 to each semicircular insert 46 with steel wire.

[0052] Step 3: Insert the connecting rod 55 into the lower angle steel 45, insert the middle insert 51 into the corrugated pipe 2, and insert the grouting pipe 4 into the middle insert 51, build the template of the bottom plate 59 and pour concrete;

[0053] Step 4: The steel bars of the column 41 are set on the reserved steel bars of the base plate 59, and then the formwork of the column 41 is set up and concrete is poured;

[0054] Step 5: Remove the push wedge 32 and tension the steel strand 44 using a through-type steel strand jack, then set the upper anchor 43 and the upper angle steel 49, then cut the steel strand 44, and then seal the anchor at the upper anchor 43.

[0055] The implementation principle of a vertical prestressed component construction method in an embodiment of the present application is: the steel strand 44 is cut once after being tensioned to reduce the possibility of waste material of the steel strand.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A vertical prestressed member, comprising a concrete member (1), a bellows (2) disposed in the concrete member (1), a tensioning assembly (3) disposed in the bellows (2) and applying prestress to the concrete member, and a grouting pipe (4) disposed in the concrete member (1) and connected to the bellows (2) for grouting in the bellows (2), characterized in that: The concrete component (1) is provided with a fixed support rod (5), the support rod (5) is provided with a middle insert (51) that can be tightly plugged into the corrugated pipe (2), the middle insert (51) is fixedly connected with a rubber pad (52) that can be tightly attached to the surface of the corrugated pipe (2), the grouting pipe (4) is tightly plugged into the end of the middle insert (51) away from the corrugated pipe (2), and the support rod (5) is provided with a support portion (53) that is attached to the lower surface of the grouting pipe (4); the bottom end of the support rod (5) is sleeved with a connecting rod (55), the connecting rod (55) is provided with a rod rack (56), the support rod (5) is rotatably connected with a rack screw (57), and the rack screw (57) is threadedly connected with a limit rack (58) that can mesh with the rod rack (56).

2. A vertical prestressed member according to claim 1, characterized in that: The outer wall of the grouting pipe (4) is provided with a limit block (54) abutting against the support portion (53); the surface of the limit block (54) away from the grouting pipe (4) is inclined; the side of the inclined surface of the limit block (54) close to the grouting pipe (4) is away from the corrugated pipe (2).

3. A vertical prestressed member according to claim 1, characterized in that: The concrete component (1) includes a bottom plate (59) for the bottom end of the support rod (5) to be placed, a column (41) provided on the upper surface of the bottom plate (59) and for the corrugated pipe (2) to be set, the tensioning component (3) includes a lower anchor (42) provided in the bottom plate (59), an upper anchor (43) provided at the upper end of the column (41), and a steel strand (44) provided between the lower anchor (42) and the upper anchor (43) and anchored and tensioned. Two lower angle steels (45) are provided in the bottom plate (59), the lower anchor (42) abuts against the two lower angle steels (45), and the upper parts of the two lower angle steels (45) are fixedly connected with semicircular inserts (46), the semicircular inserts (46) are spliced ​​to form a complete circular tube and are tightly inserted into the bottom end of the corrugated pipe (2), and the adjacent sides of the two lower angle steels (45) are tightly attached to each other and tightly attached to the steel strand (44).

4. A vertical prestressed member according to claim 3, characterized in that: Each lower angle steel (45) corresponds to a row of semicircular inserts (46), and each row of semicircular inserts (46) is fixedly connected to a pipe support rod (47), and the bottom end of the pipe support rod (47) is fixedly connected to the lower angle steel (45).

5. A vertical prestressed member according to claim 3, characterized in that: The bottom end of the support rod (5) is slidably connected to the lower angle steel (45), and the adjacent sides of the two lower angle steels (45) are fixedly connected with connecting pieces (48), and the two connecting pieces (48) are detachably connected.

6. A vertical prestressed member according to claim 3, characterized in that: Two upper angle steels (49) are provided at the upper end of the column (41), and the upper anchor (43) can abut against the upper angle steels (49), and the upper parts of the two upper angle steels (49) are separated from each other.

7. A vertical prestressed member according to claim 4, characterized in that: The semicircular insert (46) with the highest height is provided with a clamping block (31) for clamping the steel strand (44).

8. A vertical prestressed member according to claim 7, characterized in that: The clamping block (31) is slidably connected to the semicircular insert (46), and the semicircular insert (46) is slidably connected to a pushing wedge (32) capable of pushing the clamping block (31) toward the steel strand (44). The width of the clamping block (31) on the side close to the steel strand (44) is smaller than the width of the clamping block (31) on the side away from the steel strand (44).

9. A method for constructing a vertical prestressed member, for constructing a vertical prestressed member according to any one of claims 1 to 8, characterized in that: The specific steps include: Step 1: Arrange the internal steel bars of the bottom plate (59), then pass the steel strand (44) through the corrugated pipe (2), set the lower anchor (42) at the bottom end of the steel strand (44), and pre-embed the lower angle steel (45) so that the lower angle steel (45) is tightly attached to and pressed against the steel strand (44); Step 2: Apply lubricant to the outer wall of the semicircular insert (46), and then tightly fit the bellows (2) corresponding to the two rows of semicircular inserts (46) on the steel strand (44). Then, the clamping block (31) is tightly attached to the steel strand (44), and the bellows (2) is attached to each semicircular insert (46) and tied with steel wire; Step 3: Connect the connecting rod (55) to the lower angle steel (45), connect the middle plug (51) to the corrugated pipe (2), and connect the grouting pipe (4) to the middle plug (51), build the template of the bottom plate (59) and pour concrete; Step 4: The steel bars of the column (41) are set on the reserved steel bars of the bottom plate (59), and then the formwork of the column (41) is set up and concrete is poured; Step 5: Remove the push wedge (32) and tension the steel strand (44), then set the upper anchor (43) and the upper angle steel (49), then cut the steel strand (44), and inject concrete slurry into the corrugated pipe (2) through the grouting pipe (4), and then perform anchor sealing at the upper anchor (43).

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