Detection test device for duct grouting of prestressed steel beam of concrete beam

Abstract

The utility model provides a concrete beam prestressed steel beam duct grouting detection test device which comprises a steel reinforcement framework, a steel pipe corrugated pipe, grouting equipment and a pressure gauge. The steel bar framework is formed by binding according to a concrete beam steel bar design drawing relying on a project; the steel pipe is formed by sequentially and axially splicing a plurality of steel pipe sections, and is fixedly arranged on the steel reinforcement framework through a steel pipe fixer according to the coordinates of a prestressed steel beam of the concrete beam; the corrugated pipe is arranged in the steel pipe in a penetrating mode according to the linear trend identical to that of the actual prestressed steel beam, and the prestressed steel beam penetrates through the corrugated pipe. The mud jacking equipment is connected to one end of the corrugated pipe and used for jacking mud into the corrugated pipe; and the pressure gauge is arranged at a corrugated pipe mud jacking detection point. According to the concrete beam prestressed steel beam duct grouting detection test device, the prestressed steel beam duct can be split to observe the grouting compactness after grouting, the detection result is more real and reliable than nondestructive detection, the compactness can be accurately calculated, and fine grouting construction control is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of grouting detection, and in particular to a grouting detection test device for prestressed steel bundle ducts in concrete beams. Background Art

[0002] After the prestressed steel strands are tensioned in prestressed concrete beams, grouting is required to encapsulate the strands and protect them from corrosion caused by water seepage, oxidation, and other factors during later use. The grouting material also fills the entire strand channel, integrating the strands with the concrete beam and facilitating stress-bearing. However, due to the inability to flexibly adapt the grouting material preparation and grouting operations to the external environment and conditions, the grouting process often results in loose grouting or even voids, impacting the load-bearing performance and durability of the prestressed concrete beam.

[0003] Existing grouting density testing typically uses nondestructive testing devices. Due to various limitations, these devices can only estimate the location of defects after grouting, but cannot accurately determine density. During grouting construction, pressure at the grout outlet is often controlled. Traditional testing devices cannot measure the pressure at key locations during grouting, and lack control parameters during the grouting process, which is not conducive to refined grouting construction and quality control. Summary of the Invention

[0004] The present application provides a concrete beam prestressed steel bundle duct grouting detection test device, which can solve the technical problem of how to accurately detect the grouting density existing in the prior art.

[0005] The present application provides a test device for grouting detection of prestressed steel strand holes in concrete beams, comprising:

[0006] The steel skeleton is tied according to the concrete beam reinforcement design drawing of the supporting project;

[0007] The steel pipe is formed by sequentially axially splicing a plurality of steel pipe segments and is fixed on the steel skeleton by a steel pipe fixture according to the coordinates of the prestressed steel tendons of the concrete beam;

[0008] The bellows is arranged in the steel pipe according to the same linear direction as the actual prestressed steel strand, and the bellows is used to pass the prestressed steel strand;

[0009] a grouting device connected to one end of the bellows and used for grouting the inside of the bellows;

[0010] The pressure gauge is installed at the bellows grouting detection point.

[0011] Furthermore, the diameters of the plurality of steel pipe segments are the same as the maximum bundle diameter of the prestressed steel bundle.

[0012] Furthermore, the steel pipe segment includes a first steel pipe segment part and a second steel pipe segment part, and the first steel pipe segment part and the second steel pipe segment part are spliced ​​in a longitudinal section direction to form the steel pipe segment, and the longitudinal section is perpendicular to the central axis of the steel pipe segment.

[0013] Furthermore, the first steel pipe segment part and the second steel pipe segment part both include a semicircular steel pipe segment and a longitudinal section connecting plate connected to the outer wall surface of the semicircular steel pipe segment and extended on a vertical plane. The first steel pipe segment part and the second steel pipe segment part are screwed and fixed together through the longitudinal section connecting plates of the two to form the steel pipe segment.

[0014] Furthermore, a plurality of bolt holes are longitudinally spaced apart on the longitudinal section connecting plate, and bolts are passed through the rear ends of the bolt holes and nuts are tightened.

[0015] Furthermore, the semicircular end portions of the first steel pipe segment portion and the second steel pipe segment portion both extend outward in the cross-sectional direction to form cross-sectional connecting disks.

[0016] Furthermore, a plurality of bolt holes are circumferentially spaced apart on the cross-sectional connecting plate, and bolts are passed through the rear ends of the bolt holes and nuts are tightened.

[0017] Furthermore, the steel bar skeleton is in a U-shaped groove shape.

[0018] Furthermore, the steel frame is formed by bending the steel mesh into a U-shaped groove.

[0019] Furthermore, the bellows grouting detection points include the bellows grouting inlet, the bellows grouting outlet, and the position where the bellows curvature exceeds a preset value.

[0020] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0021] The present application provides a test device for grouting detection of prestressed steel bundle ducts in concrete beams, which can realize the dissection of the prestressed steel bundle ducts after grouting to observe the grouting density. The test results are more real and reliable than non-destructive testing, and the density can be accurately calculated, which is conducive to the refined control of grouting construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a test device for grouting detection of prestressed steel bundle holes in concrete beams provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the longitudinal section structure of a steel pipe segment provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a steel bar skeleton provided in an embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of a steel pipe segment provided in an embodiment of the present application.

[0026] In the figure: 1. Steel skeleton; 2. Corrugated pipe; 3. Steel pipe segment; 4. Steel pipe holder; 5. Grouting equipment; 6. Pressure gauge; 31. Cross-section connecting plate; 32. Longitudinal section connecting plate; 33. Bolt hole; 34. Bolt; 35. Nut. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figure 1 The present application provides a concrete beam prestressed steel bundle duct grouting detection test device, comprising a steel skeleton 1, a steel pipe, a corrugated pipe 2, a grouting device 4 and a pressure gauge 5. The steel skeleton 1 is tied according to the concrete beam steel bar design drawing of the supporting project, which fully conforms to the ordinary steel bar structure of the prestressed concrete beam to be tested, and can make full use of the skeleton to carry out the concrete beam prestressed steel bundle duct grouting detection test, which is used to bear the load for the corrugated pipe 2 and the grouting slurry in the prestressed steel bundle in the corrugated pipe 2; the steel pipe is formed by axially splicing a plurality of steel pipe segments 3 in sequence and is fixedly arranged on the steel skeleton 1 through the steel pipe holder 4 according to the coordinates of the concrete beam prestressed steel bundle, forming a pressure gauge 5 corresponding to the actual prestressed steel bundle. The multi-stage steel pipe segments 3 are used for the corrugated pipe 2 to pass through, and each node in the multi-node linear direction of the corrugated pipe 2 plays a supporting role; the corrugated pipe 2 is passed through the steel pipe according to the same linear direction of the actual prestressed steel bundle, and the corrugated pipe 2 is used to pass the prestressed steel bundle, so that the slurry enters the corrugated pipe 2 and grouting is performed on the prestressed wire bundle in the corrugated pipe 2; the grouting equipment 5 is connected to one end of the corrugated pipe 2 for grouting into the corrugated pipe 2; the pressure gauge 6 is installed at the grouting detection point of the corrugated pipe 2.

[0030] The present application provides a test device for grouting detection of prestressed steel bundle ducts in concrete beams, which can realize the dissection of the prestressed steel bundle ducts after grouting to observe the grouting density. The test results are more real and reliable than non-destructive testing, and the density can be accurately calculated, which is conducive to the refined control of grouting construction.

[0031] In one embodiment, the inner diameter of the plurality of steel pipe segments 3 is the same as the maximum bundle diameter of the prestressed steel strands, thereby achieving dense grouting that matches the bundle diameter of the prestressed steel strands. In an alternative embodiment of the present application, the inner diameter of the plurality of steel pipe segments 3 may be slightly larger than the bundle diameter of the prestressed steel strands, providing redundant space for the passage of the corrugated tube 2 therein and for the passage of the prestressed steel strands within the corrugated tube 2, while not affecting the dense grouting effect within the prestressed steel strands.

[0032] In one embodiment, the steel pipe segment 3 includes a first steel pipe segment portion and a second steel pipe segment portion, which are spliced ​​together in a longitudinal cross-section direction to form the steel pipe segment 3, wherein the longitudinal cross-section is perpendicular to the central axis of the steel pipe segment 3. Specifically, the first steel pipe segment portion and the second steel pipe segment portion each include a semicircular steel pipe segment 3 and a longitudinal cross-section connecting plate 32 connected to the outer wall of the semicircular steel pipe segment 3 and extending outward in a vertical plane. The first steel pipe segment portion and the second steel pipe segment portion are screwed and fixedly spliced ​​together by the longitudinal cross-section connecting plate 32 to form the steel pipe segment 3. The semicircular steel pipe segment 3 is formed by longitudinally sectioning a full circular tube, including a hollow semicircular end portion and a half cylindrical surface, wherein both longitudinal edges of the half cylindrical surface extend outward to form the longitudinal cross-section connecting plate 32. The longitudinal direction is the direction of the central axis of the steel pipe segment 3.

[0033] In a specific embodiment, please refer to Figure 2 , a plurality of bolt holes 33 are longitudinally spaced apart on the longitudinal section connecting plate 32, and a plurality of bolts 34 are respectively passed through the rear end of the bolt hole 33 to tighten the nut 35, and the first steel pipe segment part and the second steel pipe segment part are screwed and fixed through the longitudinal section connecting plate 32 on the corresponding side to form the steel pipe segment 3; by designing the steel pipe segment 3 to be spliced, it is possible to dismantle the longitudinal section connecting plate 32 of the first steel pipe segment part and the second steel pipe segment part after grouting, and separate the corrugated pipe 2 and the prestressed steel bundle after grouting in the corrugated pipe 2 from the steel pipe segment 3 as a whole, so as to facilitate the subsequent cutting of the corrugated pipe 2 and the detection of the grouting density of the prestressed steel bundle channel in the corrugated pipe 2.

[0034] In one embodiment, the semicircular ends of the first steel pipe segment and the second steel pipe segment are both extended outward in the cross-sectional direction to form a cross-sectional connection plate 31. Specifically, the hollow semicircular end extends outward along the semicircular arc to form the cross-sectional connection plate 31. Figure 3The cross-sectional connecting plate 31 is provided with a plurality of bolt holes 33 at an interval of annularly, and the bolts 34 are passed through the bolt holes 33 and the nuts 35 are tightened at the rear ends. By butting and fixing the steel pipe segments 3 in pairs through the cross-sectional connecting plate 31, all the steel pipe segments 3 are spliced ​​in pairs in an axial butt-jointed manner to form a steel pipe with the same linear shape as the actual prestressed steel bundle. By designing multiple steel pipe segments 3 for axial butt-jointed splicing, it is possible to provide grouting pressure for grouting in the corrugated pipe 2, and it is also convenient to grout the prestressed steel bundle duct in the corrugated pipe 2. After grouting, the bolts 34 on the cross-sectional connecting plate 31 are removed, and combined with the removal of the above-mentioned longitudinal connecting plate 32, the corrugated pipe 2 in the steel pipe segment 3 and the prestressed steel bundle in the corrugated pipe 2 are released as a whole for pipe cutting and grouting quality testing.

[0035] In one embodiment, the steel pipe segment 3 can be linear or curved, matching the linear shape of the prestressed steel tendons at the corresponding coordinate positions of the prestressed steel tendons of the concrete beam.

[0036] In one embodiment, please refer to 4, the steel skeleton 1 is U-shaped, and the corrugated tube 2 is fixed in the U-shaped steel skeleton 1 through the steel tube segment 3, forming the same linear shape as the actual prestressed steel strand.

[0037] Furthermore, the steel frame 1 is formed by bending the steel mesh into a U-shaped groove.

[0038] Furthermore, the grouting detection points of the bellows 2 include the bellows slurry inlet, the bellows slurry outlet and the position where the curvature of the bellows 2 exceeds the preset value, that is, the linear change position of the bellows 2. The grouting pressure at the linear change position is higher and has greater detection value.

[0039] The present application provides a concrete beam prestressed steel bundle duct grouting detection test device, and the specific detection test method includes the following steps:

[0040] Step S1: Tie the steel bar skeleton 1, which is strictly tied based on the concrete beam steel bar design drawing of the project;

[0041] Step S2: on-site sampling is conducted according to the model of the prestressed steel bundle corrugated pipe 2 to be tested in the design drawing. The corrugated pipe 2 is adopted in the actual project. The steel pipe segments 3 of the corrugated pipe 2 are connected according to straight or curved segments. The position on the steel skeleton 1 during connection is determined according to the coordinate position of the corrugated pipe 2 in the design document. The steel pipe segments 3 are first aligned longitudinally using the cross-section connecting plate 31 and then bolted into the bolts 34 for temporary fixation. At this time, the bolts 34 are not fully tightened. Then, the longitudinal section connecting plates 32 on both sides of the first steel pipe segment part and the second steel pipe segment part are aligned, and the bolts 34 are bolted in for temporary bolting. After fine-tuning the coordinates of the steel pipe segment 3 according to the previous coordinates, the steel pipe segment 3 is fixed to the steel skeleton 1 with the steel pipe fixture 4. At this time, the bolts 34 on the longitudinal section connecting plate 32 are tightened.

[0042] Step S3: installing pressure gauges 6 at the slurry inlet of the bellows, at the location where the linear shape of the pipeline changes, and at the slurry outlet of the bellows;

[0043] Step S4: Perform grouting construction according to the established grouting process for prestressed concrete beams, and regularly record the readings of each pressure gauge 6;

[0044] Step S5: After the grouting is completed and after 24 hours of grouting, disassemble the steel pipe holder 4, lay the steel pipe flat on the flat ground, loosen the bolts 34, disassemble the steel pipe segment 3, use a cutting machine to cut the corrugated pipe 2, observe the grouting density, and judge the grouting construction quality in the prestressed steel bundle channel of the concrete beam. The grouting construction process can be adjusted according to the measured parameters.

[0045] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0047] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A grouting test device for prestressed steel strand holes in concrete beams, characterized in that: include: The steel skeleton is tied according to the concrete beam reinforcement design drawing of the supporting project; The steel pipe is formed by sequentially axially splicing a plurality of steel pipe segments and is fixed on the steel skeleton by a steel pipe fixture according to the coordinates of the prestressed steel tendons of the concrete beam; The bellows is arranged in the steel pipe according to the same linear direction as the actual prestressed steel strand, and the bellows is used to pass the prestressed steel strand; a grouting device connected to one end of the bellows and used for grouting the inside of the bellows; The pressure gauge is installed at the bellows grouting detection point.

2. The concrete beam prestressed steel strand duct grouting test device according to claim 1 is characterized in that: The diameters of the plurality of steel pipe segments are the same as the maximum bundle diameter of the prestressed steel bundle.

3. The concrete beam prestressed steel strand duct grouting test device according to claim 1, characterized in that: The steel pipe segment includes a first steel pipe segment part and a second steel pipe segment part, and the first steel pipe segment part and the second steel pipe segment part are spliced ​​together in a longitudinal section direction to form the steel pipe segment, and the longitudinal section is perpendicular to the central axis of the steel pipe segment.

4. The concrete beam prestressed steel strand duct grouting test device according to claim 3, characterized in that: The first steel pipe segment part and the second steel pipe segment part both include a semicircular steel pipe segment and a longitudinal section connecting plate connected to the outer wall surface of the semicircular steel pipe segment and extending outward on a vertical plane. The first steel pipe segment part and the second steel pipe segment part are screwed and fixed together through the longitudinal section connecting plates of the two to form the steel pipe segment.

5. The concrete beam prestressed steel strand duct grouting test device according to claim 4, characterized in that: The longitudinal section connecting plate is provided with a plurality of bolt holes spaced longitudinally, and the bolts are passed through the rear ends of the bolt holes and tightened with nuts.

6. The concrete beam prestressed steel strand duct grouting test device according to claim 4, characterized in that: The semicircular ends of the first steel pipe segment portion and the second steel pipe segment portion both extend outward in the cross-sectional direction to form a cross-sectional connecting disk.

7. The concrete beam prestressed steel strand duct grouting test device according to claim 6, characterized in that: The cross-section connecting plate is provided with a plurality of bolt holes spaced apart in an annular direction, and the bolts are passed through the rear ends of the bolt holes and nuts are tightened.

8. The concrete beam prestressed steel strand duct grouting test device according to claim 1, characterized in that: The steel bar skeleton is in a U-shaped groove shape.

9. The concrete beam prestressed steel strand duct grouting test device according to claim 8, characterized in that: The steel frame is formed by bending the steel mesh into a U-shaped groove.

10. The concrete beam prestressed steel strand duct grouting test device according to claim 1, characterized in that: The bellows grouting detection points include the bellows grouting inlet, the bellows grouting outlet, and the position where the bellows curvature exceeds a preset value.

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