An aero-engine test stand injection cylinder pre-embedded ring and a construction method thereof

Abstract

The application discloses an aero-engine test stand injection cylinder pre-embedded ring and a construction method thereof, wherein the pre-embedded ring is assembled by connecting a plurality of sectional arcs in a head-to-tail mode, an inner support assembly is arranged inside the pre-embedded ring, and an outer support assembly is arranged outside the pre-embedded ring, so that the pre-embedded ring is embedded into a wall body in a vertical state, and an anchor plate and an anchor bar are circumferentially welded to the periphery of the pre-embedded ring. The application solves the problem that a large-diameter pre-embedded ring is difficult to process and transport by adopting the sectional processing and on-site assembling mode in the structure, avoids local deformation of the pre-embedded ring by arranging the inner support assembly, and improves the anchoring strength of the pre-embedded ring and the wall body by additionally arranging the anchor plate. In the construction method, the sectional arcs are accurately positioned by establishing a coordinate system on the ground, error accumulation is avoided, the strength of the outer support assembly is strengthened by pouring a shear wall with a specified height, the inner stress of the pre-embedded ring is released by adjusting the bolt torque of the inner support assembly, the roundness and concentricity are finely adjusted, and the construction quality and construction efficiency are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine test benches, and in particular to a pre-embedded ring for an aero-engine test bench ejector tube and its construction method. Background Technology

[0002] In the construction project of the aircraft engine test bench, the ejector tube room is located between the exhaust tower and the test workshop. The front and rear concrete shear walls of the ejector tube room need to be vertically embedded with two concentric steel rings (i.e., embedded rings) as installation connection nodes at the front and rear ends of the ejector tube. The construction accuracy of the embedded rings, especially whether the concentricity meets the design standards, directly determines whether the ejector tube can be installed smoothly.

[0003] In traditional construction methods, the embedded ring is manufactured as a whole in the factory, then hoisted and positioned on the construction site before a concrete shear wall is poured to complete the embedded construction. This method is only suitable for cases where the diameter of the embedded ring is small. For large-diameter embedded rings, overall manufacturing and transportation are extremely difficult. A more reasonable construction method would be to manufacture and transport them in parts, and then assemble them on the construction site. However, there is a lack of mature construction methods for this in the current technology.

[0004] In a certain construction project, the inner diameters of two embedded rings are 8960mm and 6860mm respectively, with a horizontal distance of 33m. The roundness error of the embedded rings is ≤3mm, and the concentricity error of the two rings is ≤5mm. The following technical problems are encountered during construction: 1. During assembly on the construction site, each segment arc has some manufacturing error. Although this error is within the allowable range for the segment arc, if there is no strict positioning and error control method during assembly, it is very easy to cause error accumulation, resulting in the roundness of the embedded rings after assembly not meeting the standard, which directly affects the installation of the ejector tube; 2. During the assembly and hoisting process of the embedded rings, there is internal stress concentration. During the concrete shear wall pouring stage, part of the concrete load is applied to the outer circumference of the embedded rings. The internal stress concentration and the superposition of external loads cause the embedded rings to be prone to local deformation, resulting in the roundness not meeting the standard; 3. Traditionally, embedded rings are anchored to the wall by welding radial anchor bars to the outer circumference. However, when the diameter of the embedded ring is too large, it is difficult to provide sufficient anchoring strength by relying solely on anchor bars.

[0005] Therefore, it is evident that creating a new type of pre-embedded ring for the ejector tube of an aero-engine test stand and its construction method is one of the important research and development topics at present. Summary of the Invention

[0006] The first technical problem to be solved by this invention is to divide the embedded ring into multiple segmented arcs, thereby facilitating processing, manufacturing, and transportation; the second technical problem to be solved is to accurately position each segmented arc during the assembly stage at the construction site to ensure the roundness of the assembled embedded ring; the third technical problem to be solved is to set up supports inside the embedded ring to ensure that the embedded ring does not undergo local deformation during construction; and the fourth technical problem to be solved is to improve the anchorage strength between the embedded ring and the wall.

[0007] To solve the above-mentioned technical problems, the present invention provides a pre-embedded ring for the ejector tube of an aero-engine test stand, comprising several segmented arcs, each segmented arc having the same radius and central angle, and the segmented arcs being connected end to end to form a circular pre-embedded ring. The inner circumference of the embedded ring is welded with a bolt plate for connecting to the inner support assembly. The outer periphery of the pre-embedded ring is welded with several support seats for connection with the external support assembly; An array of anchor plates is evenly arranged around the outer periphery of the pre-embedded ring. Each group consists of two anchor plates. Each anchor plate is L-shaped, and the two anchor plates are arranged in a gradually converging V-shape. The root of the long straight section is welded and fixed to the outer periphery of the pre-embedded ring, and the short straight sections are bent towards each other.

[0008] Furthermore, an array of anchor bars is evenly arranged around the outer periphery of the pre-embedded ring, with two anchor bars in each group, and each anchor bar extends outward along the radial direction of the pre-embedded ring.

[0009] Furthermore, the embedded ring has annular wing plates extending outward on both sides along its axial direction to improve structural strength.

[0010] Furthermore, the present invention also provides a construction method for constructing the aforementioned pre-embedded ring for the ejector tube of an aero-engine test stand, the specific construction steps of which include: S1. Processing and manufacturing; Create a BIM model and manufacture the segmented arc, internal support components, and external support components according to the drawings; S2, Ground assembly pre-embedded ring; Erect and level the frame on the ground, hoist a segmented arc and place it flat on the frame. Use two laser levels to mark the first chord and the perpendicular bisector of the first chord of the segmented arc. Repeat the above operation to mark the perpendicular bisector of the second chord and the perpendicular bisector of the second chord respectively. The intersection of the two perpendicular bisectors is the center of the embedded ring. Establish a coordinate system in the horizontal plane with the center of the embedded ring as the origin. Hoist each segmented arc to the frame one by one. Locate the endpoints of each segmented arc according to the theoretical coordinate points of the BIM model. After the positioning is completed, assemble each segmented arc to form a complete embedded ring. S3. Install the internal support components; S4. Install the external support components; Install the external support components and pour a concrete shear wall to the specified height, wherein the concrete shear wall encloses the lower part of the external support components; S5. Hoisting and positioning, stress relief and center adjustment; S6. Adjustment of concentricity of the embedded ring; S7. Continue pouring concrete shear walls; S8. Remove the internal support components.

[0011] Furthermore, in step S1, bolted flanges are reserved at the ends of the segmented arcs. In step S2, adjacent segmented arcs are first fixed with high-strength bolts. After the inner support assembly is installed in step S3, the segmented arcs are welded together.

[0012] Furthermore, the inner support assembly in steps S1 and S3 includes a center plate, an inner liner plate, a first inner brace, and a second inner brace; The center plate is set at the center of the embedded ring; The inner lining plate is arc-shaped, and several inner lining plates are evenly arranged along the inner circumference of the embedded ring so that the inner side is enclosed in a regular polygon. The inner lining plates are welded and fixed to the inner circumference of the embedded ring by spot welding. The length of the first inner support is slightly smaller than the diameter of the embedded ring. There are two first inner supports in the same circumferential plane. When the embedded ring is in an upright state, the two first inner supports are located at a specified distance offset from the horizontal diameter of the embedded ring. The two ends of the first inner support are connected to the bolt plate on the inner circumference of the embedded ring by bolts, and the middle part of the first inner support is connected to the center plate by bolts. The length of the second inner support is slightly smaller than the radius of the embedded ring. Multiple second inner supports are arranged radially in the same circumferential plane. The angles between the second inner support and the first inner support, and between adjacent second inner supports, are equal. The outer end of the second inner support is bolted to the bolt plate on the inner circumference of the embedded ring, and the inner end of the second inner support is bolted to the center plate.

[0013] Furthermore, in step S4, the external support assembly includes columns and diagonal braces. The number and position of the columns correspond to the support seats on the pre-embedded ring, and the diagonal braces are connected between adjacent columns by bolts. During construction, a concrete foundation is poured under the column in advance. After the concrete foundation reaches 75% strength, the column is installed according to the design position. The column foot is connected to the concrete foundation by the back-expanded bottom anchor bolt. During installation, the column top elevation is adjusted by a level instrument. After the column is installed, diagonal bracing is connected between adjacent columns. After the columns and diagonal braces are installed, pour concrete shear wall to a position 500-800mm above the bottom of the embedded ring.

[0014] Furthermore, in step S5, after the embedded ring is hoisted onto the external support assembly, the verticality and horizontality of the embedded ring are adjusted. After adjustment, it is left to stand for more than 24 hours to release the elastic deformation caused by hoisting. After standing, jacks are set up between the bottom of the embedded ring and the top of the poured concrete shear wall, and the height of the embedded ring center is adjusted by inserting steel shims between the embedded ring and the external support assembly. After adjustment, the embedded ring is welded and fixed to the external support assembly to prevent subsequent construction disturbance.

[0015] Furthermore, the specific method for adjusting the concentricity of the embedded ring in step S6 is as follows: using the design axis of the ejector tube as a reference, the center coordinates of the two embedded rings are measured simultaneously with a total station, and the center deviation of the embedded ring is finely adjusted by tightening the bolts of the inner support component until the design requirements are met.

[0016] Furthermore, in step S7, the concrete pouring is carried out in symmetrical layers on both sides, with each layer having a height of ≤1.5m. During the vibration process, the center coordinates of the embedded ring are monitored in real time. If the center deviation is found to be >3mm, the ring is immediately fine-tuned by a chain hoist to ensure that the concentricity of the embedded ring always meets the requirements.

[0017] With this design, the present invention has at least the following advantages.

[0018] 1. The embedded ring in this invention is assembled by connecting multiple segmented arcs end to end, which effectively reduces the difficulty of processing, manufacturing and transporting large-diameter embedded rings.

[0019] 2. In this invention, multiple sets of anchor plates are uniformly welded around the outer periphery of the pre-embedded ring. Each set of anchor plates is arranged in a V-shape that gradually converges. Each anchor plate is L-shaped. The added anchor plates, combined with traditional anchor bars, effectively improve the anchoring strength between the pre-embedded ring and the wall.

[0020] 3. In the construction method of this invention, during the ground assembly stage of the embedded ring, a laser level is used to mark the first chord, the perpendicular bisector of the first chord, the second chord, and the perpendicular bisector of the second chord of the segmented arc. The intersection of the two perpendicular bisectors is used as the center of the circle, and a coordinate system is established in the horizontal plane with the center as the origin. Subsequently, the end coordinate points are recorded for each segmented arc after hoisting, and compared with the theoretical coordinate points in the BIM model. The position of the segmented arc is finely adjusted according to the comparison results until all segmented arcs are accurately positioned. Then, high-strength bolts are used to connect each segmented arc. After the internal support components are installed, the segmented arcs are welded and fixed together. By completing the ground assembly of the embedded ring in this way, the roundness can be effectively guaranteed to meet the design requirements.

[0021] 4. In the construction method of the present invention, the embedded ring is provided with an internal support component, which not only effectively ensures the overall structural strength of the embedded ring and avoids local deformation of the embedded ring during the wall pouring stage, but also facilitates its removal in the later stage of construction.

[0022] 5. In the construction method of the present invention, after the external support components are installed, a concrete shear wall is poured to a height of 500-800mm from the bottom of the pre-embedded ring. The concrete shear wall at this height encloses the external support components, effectively improving the structural strength of the external support components and preventing large deformation of the external support components. At the same time, the shear wall at this height also provides a support position for the jack erection in the subsequent steps.

[0023] 6. In the construction method of the present invention, the first inner support, the second inner support and the center plate are connected by bolts, which is called center end bolting; the ends of the first inner support and the second inner support are connected by bolts to the bolting plate on the inner circumference of the embedded ring, which is called outer ring end bolting; at least one end of the center end bolting and the outer ring end bolting has a radial allowance between the bolt and the bolt hole, and the stress in the embedded ring can be released by adjusting the bolt tightening torque, thereby finely adjusting the roundness and center position of the embedded ring. Attached Figure Description

[0024] The above is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the pre-embedded ring in this invention.

[0026] Figure 2 This is a partial structural diagram of the anchor plate and anchor bars.

[0027] Figure 3 This is a partial structural diagram of the bolted plate.

[0028] Figure 4 This is a partial structural diagram of the support base.

[0029] Figure 5 This is a flowchart of the construction method provided by the present invention.

[0030] Figure 6 This is a schematic diagram of the method for locating the first segmented arc and the center of the circle in step S2.

[0031] Figure 7 This is a schematic diagram of the ground assembly of the pre-embedded ring in step S2.

[0032] Figure 8 This is a schematic diagram of step S3, which involves installing the internal support components.

[0033] Figure 9 This is a schematic diagram of step S4, which involves installing the external support components.

[0034] Figure 10 This is a schematic diagram of the adjustment of the center of the pre-embedded ring in step S5.

[0035] Figure 11 This is a schematic diagram of step S7, where the concrete shear wall is poured.

[0036] Figure 12 This is a schematic diagram of step S8, which involves removing the inner support assembly.

[0037] Explanation of reference numerals in the attached drawings: 1. Embedded ring; 11. Annular wing plate; 12. Anchor plate; 13. Anchor bar; 14. Support seat; 15. Bolted plate; 16. Segmented arc; 2. Internal support assembly; 21. Inner lining plate; 22. First internal brace; 23. Second internal brace; 24. Center plate; 25. First rib plate; 26. Second rib plate; 3. External support assembly; 31. Column; 32. Diagonal brace; 4. Concrete foundation; 5. Concrete shear wall; 6. Jack; A1. First chord; A2. Second chord; B1. First vertical bisector; B2. Second vertical bisector; C1. Center of circle. Detailed Implementation

[0038] Please see Figures 1 to 4 This invention provides a pre-embedded ring for an ejector tube on an aero-engine test stand, comprising several segmented arcs 16, each segmented arc 16 having the same radius and central angle, and the segmented arcs 16 connected end to end to form a circular pre-embedded ring 1. In this embodiment, the number of segmented arcs 16 is four.

[0039] The inner circumference of the pre-embedded ring 1 is welded with a bolt plate 15 at the designed position, which is used to connect with the first inner support 22 or the second inner support 23 in the inner support assembly 2 by bolts. The embedded ring 1 has annular wing plates 11 extending outward on both sides of its axial direction, which are used to improve the structural strength of the embedded ring 1.

[0040] Several support seats 14 are welded to the outer periphery of the pre-embedded ring 1 for connection with the outer support assembly 3. The function of the outer support assembly 3 is to provide support for the pre-embedded ring 1 so that it is stably in an upright state.

[0041] In this embodiment, there are four support bases 14. When the embedded ring 1 is in an upright state, the support bases 14 are symmetrically distributed on the left and right sides with the vertical diameter of the embedded ring 1 as the axis of symmetry. Each support base 14 includes a base plate 141, a side plate 142, and a stiffening plate 143. The base plate 141 is horizontally arranged, and its left and right sides are welded and fixed to the side plate 142. The side plate 142 is welded and fixed to the outer periphery of the embedded ring 1. The stiffening plate 143 is located in the axial center plane of the embedded ring 1 and is welded and fixed to the outer periphery of the embedded ring 1, the side plate 142, and the base plate 141, respectively, to improve the structural strength of the support base 14. The base plate 141 has connecting holes for connecting to the top plate of the column 31 in the outer support assembly 3.

[0042] The pre-embedded ring 1 has a set of anchor bars 13 uniformly welded around its outer circumference. Each set of anchor bars consists of two bars, and each anchor bar extends outward radially along the pre-embedded ring 1.

[0043] In addition to the anchor bars 13, the outer periphery of the pre-embedded ring 1 is also uniformly welded with a number of anchor plates 12. Each group of anchor plates 12 consists of two plates. Each anchor plate 12 is L-shaped, and the two anchor plates 12 are arranged in a V-shape that gradually converges. The root of the long straight section is welded and fixed to the outer periphery of the pre-embedded ring 1, and the short straight sections are bent towards each other.

[0044] It should be noted that the uniform arrangement of the anchor plates 12 and anchor bars 13 along the circumference of the embedded ring 1 refers to the overall arrangement, not an absolutely uniform arrangement. Anchor plates 12 and anchor bars 13 are not installed in the areas where the support base 14 is welded. To avoid interference, the anchor plates 12 and anchor bars 13 are arranged at intervals, and their function is to improve the anchoring strength between the embedded ring 1 and the wall.

[0045] Please see Figures 5 to 12 The present invention also provides a construction method for constructing a large-diameter pre-embedded ring for an aero-engine ejector tube, the specific construction steps of which are as follows.

[0046] Step S1: Processing and manufacturing.

[0047] Establish a BIM model and manufacture segmented arc 16, internal support component 2 and external support component 3 according to the drawings.

[0048] During the manufacturing stage, bolted flanges with a model number of PL30×440×440mm are reserved at the ends of each segmented arc 16, with a flange hole deviation of ≤1mm, to ensure on-site splicing accuracy. In addition, the inner lining plate 21 in the inner support assembly 2 can also be pre-welded to the inner circumference of each segmented arc 16 by spot welding at this stage.

[0049] Step S2: Ground assembly of embedded rings.

[0050] Please see Figure 6 and Figure 7 (For clarity, Figure 6 The inner lining plate 21 is hidden in the middle. A frame is erected on the ground and leveled with a laser level. The segmented arcs 16 are hoisted according to their numbers. After the first segmented arc 16 is hoisted and placed flat on the frame, two laser levels are used to mark the first chord A1 and the perpendicular bisector of the first chord A1, i.e., the first perpendicular bisector B1, of the segmented arc 16.

[0051] Repeat the above steps to mark the second chord A2 and the perpendicular bisector of the second chord A2, i.e., the second perpendicular bisector B2.

[0052] Mark the intersection of the first vertical bisector B1 and the second vertical bisector B2. This intersection is the center C1 of the pre-embedded ring 1. Establish a coordinate system in the horizontal plane with the center C1 as the origin.

[0053] Subsequently, each segment of arc 16 was hoisted onto the jig one by one according to its number. During hoisting, the end of each segment of arc 16 was used as a measuring point, and the position of each segment of arc 16 was fine-tuned based on the theoretical coordinate points in the BIM model until the positioning was accurate. After each segment of arc 16 was positioned, it was connected and fixed to the adjacent segment of arc 16 with high-strength bolts until the four segments of arc 16 were assembled into a complete embedded ring 1.

[0054] Step S3: Install the internal support components.

[0055] Please see Figure 8 The inner support component 2 includes a center plate 24, an inner lining plate 21, a first inner support 22, and a second inner support 23.

[0056] The center plate 24 is set at the center C1 of the embedded ring 1.

[0057] The inner lining plate 21 is arc-shaped, and several inner lining plates 21 are evenly arranged along the inner circumference of the embedded ring 1 so that the inner side is enclosed in a regular polygon. The inner lining plate 21 is fixed to the inner circumference of the embedded ring 1 by spot welding. In this embodiment, the inner lining plate 21 is welded to the inner circumference of each segmented arc 16 during the processing and manufacturing stage of step S1.

[0058] The length of the first inner support 22 is slightly smaller than the diameter of the embedded ring 1. There are two first inner supports 22 in the same circumferential plane. When the embedded ring 1 is in an upright state, the two first inner supports 22 are located at a specified distance offset from the horizontal diameter of the embedded ring 1. The two ends of the first inner support 22 are connected to the bolt plate 15 on the inner circumference of the embedded ring 1 by bolts, and the middle part of the first inner support 22 is connected to the center plate 24 by bolts.

[0059] The length of the second inner support 23 is slightly smaller than the radius of the embedded ring 1. Multiple second inner supports 23 are arranged radially in the same circumferential plane. The angles between the second inner support 23 and the first inner support 22, and between adjacent second inner supports 23 are equal. The outer end of the second inner support 23 is connected to the bolt plate 15 on the inner circumference of the embedded ring 1 by bolts. The inner end of the second inner support 23 is connected to the center plate 24 by bolts.

[0060] When the first inner support 22 and the second inner support 23 are installed by bolts, the principle of "center to outer ring symmetrical final tightening" is followed, and the torque is controlled between 350 and 400 N·m.

[0061] It should be noted that, depending on the different axial lengths of the embedded ring 1, the center plate 24, the inner liner plate 21, the first inner support 22 and the second inner support 23 can all be provided in multiple layers. The first inner support 22 and the second inner support 23 of each layer extend into the space between the center plate 24 and the inner liner plate 21. Several first ribs 25 are welded at equal intervals between the layers of the inner liner plate 21. Multiple second ribs 26 are welded at equal intervals between the multiple layers of first inner supports 22 or second inner supports 23.

[0062] The function of the inner support component 2 is to provide internal support for the embedded ring 1, preventing local deformation of the embedded ring 1 during the subsequent pouring stage. After all components of the inner support component 2 are installed, the segments of the arc 16 are welded and fixed together.

[0063] Step S4: Install the external support components.

[0064] Please see Figure 9 The external support component 3 includes a column 31 and a diagonal brace 32.

[0065] The number and position of the column 31 correspond to the support seat 14 on the pre-embedded ring 1. The column 31 is made of φ200×8mm round tube, and the top of the column is provided with a top plate for connecting with the support seat 14.

[0066] During construction, a concrete foundation 4 is poured under the column 31 in advance. After the concrete foundation 4 reaches 75% strength, the column 31 is installed according to the design position. The column base is bolted to the poured concrete foundation 4 with M16×160mm extended bottom anchor bolts. When installing the column 31, the column top elevation is adjusted by a level instrument. After the column 31 is installed, diagonal braces 32 are connected between adjacent columns.

[0067] The diagonal brace 32 is made of L100×10mm angle steel and is connected to the side angle plate of the column 31 by bolts. The diagonal brace 32 between the two middle columns 31 is arranged in an X shape, and the diagonal brace 32 between the columns on the left and right sides is in the shape of "<" and ">".

[0068] After the columns and diagonal braces are installed, the concrete shear wall 5 is poured to a specified distance below the low elevation of the embedded ring 1. In this embodiment, the specified distance is 500-800mm. That is, the concrete shear wall encloses the lower parts of the columns 31 and diagonal braces 32, and the distance between the top of the concrete shear wall 5 and the bottom of the embedded ring 1 is 500-800mm.

[0069] Step S5: Lifting and positioning, stress relief, and center adjustment.

[0070] Please see Figure 10The assembled embedded ring 1 was lifted onto the outer support assembly 3 using a truck crane and guy ropes. After lifting, the verticality and horizontality of the embedded ring 1 were adjusted. After adjustment, the bolts between the support seat 14 of the embedded ring 1 and the top plate of the column 31 were tightened. After completion, it was left to stand for 24 hours to release the elastic deformation caused by lifting.

[0071] After standing for 24 hours, re-measure the center position of the embedded ring 1. If the center height needs to be adjusted, loosen the bolts between the support base 14 and the top plate of the column 31, and set up a jack 6 between the bottom of the embedded ring 1 and the top of the poured concrete shear wall 5. The jack 6 lifts the embedded ring 1 until the center reaches the design position. After lifting, insert a steel shim between the support base 14 and the top plate of the column 31, and tighten the bolts again. During the lifting process of the embedded ring 1, use a chain hoist to ensure that the embedded ring 1 does not tilt, that is, the verticality and horizontality meet the standards.

[0072] After the center height is adjusted, the column 31 and the support base 14 or the column 31 and the outer periphery of the embedded ring 1 are fixed by welding with steel plates. At this time, the connection between the embedded ring 1 and the outer support component 3 changes from bolted connection to rigid connection to prevent the position of the embedded ring 1 from being disturbed during subsequent construction.

[0073] Step S6: Adjust the concentricity of the pre-embedded ring.

[0074] Using the design axis of the ejector tube as a reference, the center coordinates of the two embedded rings are measured simultaneously with a total station. The center deviation of the embedded rings is finely adjusted by tightening the bolts of the inner support components until the design requirements are met.

[0075] It should be noted that the outer ends of the first inner support 22 and the second inner support 23 are bolted to the bolted plate 15, which is called the outer ring end bolting; the first inner support 22 and the second inner support 23 are bolted to the center plate 24 at the center, which is called the center end bolting; there is a 1.5mm margin between the bolt and the bolt hole at at least one end of the outer ring end bolting and the center end bolting. The embedded ring 1 has internal stress when it is welded in each segment arc 16. The internal stress of the embedded ring 1 can be released by adjusting the torque of the bolt at the specified position, and the roundness of the embedded ring 1 can be finely adjusted, thereby affecting the center position of the two embedded rings 1, so that the two parameters of roundness and concentricity simultaneously meet the design requirements.

[0076] Step S7: Continue pouring concrete shear walls.

[0077] Please see Figure 11 In step S4 above, the concrete shear wall 5 has been poured to a height of 500-800mm from the bottom elevation of the embedded ring 1. In this step, the concrete shear wall 5 will continue to be poured above this height.

[0078] During pouring, symmetrical layered pouring is adopted on both sides (the dotted line in the figure is the layer line), and the height of each layer is ≤1.5m. During the vibration process, the center coordinates of the embedded ring 1 are monitored in real time. If the center deviation is found to be >3mm, the chain hoist is immediately used for fine adjustment to ensure that the concentricity of the embedded ring always meets the requirements.

[0079] It should be noted that during the vibration process, the column 31 may undergo elastic deformation due to uneven vibration. Therefore, chain hoists need to be connected to both sides of the pre-embedded ring 1, and the center coordinates need to be monitored in real time with a total station. If the deviation is greater than 3mm, it should be corrected immediately by chain hoists.

[0080] S8. Remove the internal support components.

[0081] Please see Figure 12 Once the concrete shear wall 5 reaches 75% of its design strength, the inner support component 2 is removed, while the outer support component 3, which is completely enclosed within the concrete shear wall 5, does not need to be removed.

[0082] During dismantling, follow the symmetrical dismantling sequence to avoid uneven stress on the ring. First, dismantle each of the second supports 23, then dismantle the first support 22 and the center plate 24. Finally, use plasma cutting to remove the inner lining plate 21 and the bolt plate 15 on the inner circumference of the embedded ring 1. Repair the damaged areas with paint for corrosion protection.

[0083] Structurally, this invention solves the problem of difficult processing and transportation of large-diameter embedded rings by adopting a segmented processing and on-site assembly method. It avoids local deformation of the embedded rings by setting internal support components and improves the anchoring strength between the embedded rings and the wall by adding anchor plates. In terms of construction method, it achieves precise positioning of segmented arcs by establishing a coordinate system on the ground to avoid error accumulation. It strengthens the external support components by pouring shear walls of a specified height and releases the internal stress of the embedded rings by adjusting the bolt torque of the internal support components. It also fine-tunes the roundness and concentricity, effectively improving the construction quality and efficiency.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, or alterations made by those skilled in the art using the disclosed technical content shall fall within the protection scope of the present invention.

Claims

1. A pre-embedded ring for the ejector tube of an aero-engine test stand, characterized in that, It includes several segmented arcs, each with the same radius and central angle, and the segments are connected end to end to form a circular embedded ring. The inner circumference of the embedded ring is welded with a bolt plate for connecting to the inner support assembly. The outer periphery of the pre-embedded ring is welded with several support seats for connection with the external support assembly; An array of anchor plates is evenly arranged around the outer periphery of the pre-embedded ring. Each group consists of two anchor plates. Each anchor plate is L-shaped, and the two anchor plates are arranged in a gradually converging V-shape. The root of the long straight section is welded and fixed to the outer periphery of the pre-embedded ring, and the short straight sections are bent towards each other.

2. The embedded ring for the ejector tube of an aero-engine test stand according to claim 1, characterized in that, The pre-embedded ring has a set of anchor bars evenly arranged around its outer circumference, with two anchor bars in each set, and each anchor bar extends outward along the radial direction of the pre-embedded ring.

3. The embedded ring for the ejector tube of an aero-engine test stand according to claim 1, characterized in that, The embedded ring has annular wing plates extending outward on both sides of its axial direction to improve structural strength.

4. A construction method, characterized in that, The construction steps for using a pre-embedded ring for an ejector tube of an aero-engine test stand as described in any one of claims 1-3 include: S1. Processing and manufacturing; Create a BIM model and manufacture the segmented arc, internal support components, and external support components according to the drawings; S2, Ground assembly pre-embedded ring; Erect and level the frame on the ground, hoist a segmented arc and place it flat on the frame. Use two laser levels to mark the first chord and the perpendicular bisector of the first chord of the segmented arc. Repeat the above operation to mark the perpendicular bisector of the second chord and the perpendicular bisector of the second chord respectively. The intersection of the two perpendicular bisectors is the center of the embedded ring. Establish a coordinate system in the horizontal plane with the center of the embedded ring as the origin. Hoist each segmented arc to the frame one by one. Locate the endpoints of each segmented arc according to the theoretical coordinate points of the BIM model. After the positioning is completed, assemble each segmented arc to form a complete embedded ring. S3. Install the internal support components; S4. Install the external support components; Install the external support components and pour a concrete shear wall to the specified height, wherein the concrete shear wall encloses the lower part of the external support components; S5. Hoisting and positioning, stress relief and center adjustment; S6. Adjustment of concentricity of the embedded ring; S7. Continue pouring concrete shear walls; S8. Remove the internal support components.

5. The construction method according to claim 4, characterized in that, In step S1, bolted flanges are reserved at the ends of the segmented arcs. In step S2, adjacent segmented arcs are first fixed with high-strength bolts. After the inner support assembly is installed in step S3, the segmented arcs are welded together.

6. The construction method according to claim 4, characterized in that, The inner support assembly in steps S1 and S3 includes a center plate, an inner lining plate, a first inner brace, and a second inner brace. The center plate is set at the center of the embedded ring; The inner lining plate is arc-shaped, and several inner lining plates are evenly arranged along the inner circumference of the embedded ring so that the inner side is enclosed in a regular polygon. The inner lining plates are welded and fixed to the inner circumference of the embedded ring by spot welding. The length of the first inner support is slightly smaller than the diameter of the embedded ring. There are two first inner supports in the same circumferential plane. When the embedded ring is in an upright state, the two first inner supports are located at a specified distance offset from the horizontal diameter of the embedded ring. The two ends of the first inner support are connected to the bolt plate on the inner circumference of the embedded ring by bolts, and the middle part of the first inner support is connected to the center plate by bolts. The length of the second inner support is slightly smaller than the radius of the embedded ring. Multiple second inner supports are arranged radially in the same circumferential plane. The angles between the second inner support and the first inner support, and between adjacent second inner supports, are equal. The outer end of the second inner support is bolted to the bolt plate on the inner circumference of the embedded ring, and the inner end of the second inner support is bolted to the center plate.

7. The construction method according to claim 4, characterized in that, In step S4, the external support assembly includes columns and diagonal braces. The number and position of the columns correspond to the support seats on the pre-embedded ring, and the diagonal braces are connected between adjacent columns by bolts. During construction, a concrete foundation is poured under the column in advance. After the concrete foundation reaches 75% strength, the column is installed according to the design position. The column foot is connected to the concrete foundation by the back-expanded bottom anchor bolt. During installation, the column top elevation is adjusted by a level instrument. After the column is installed, diagonal bracing is connected between adjacent columns. After the columns and diagonal braces are installed, pour concrete shear wall to a position 500-800mm above the bottom of the embedded ring.

8. A construction method according to claim 4, characterized in that, In step S5, after the embedded ring is hoisted onto the external support assembly, the verticality and horizontality of the embedded ring are adjusted. After adjustment, it is left to stand for more than 24 hours to release the elastic deformation caused by hoisting. After standing, jacks are set up between the bottom of the embedded ring and the top of the poured concrete shear wall, and the height of the embedded ring center is adjusted by inserting steel shims between the embedded ring and the external support assembly. After adjustment, the embedded ring is welded and fixed to the external support assembly to prevent subsequent construction disturbance.

9. A construction method according to claim 4, characterized in that, The specific method for adjusting the concentricity of the embedded ring in step S6 is as follows: using the design axis of the ejector tube as a reference, the center coordinates of the two embedded rings are measured simultaneously with a total station, and the center deviation of the embedded ring is finely adjusted by tightening the bolts of the inner support component until the design requirements are met.

10. A construction method according to claim 4, characterized in that, In step S7, the concrete is poured in symmetrical layers on both sides, with each layer ≤1.5m in height. During the vibration process, the center coordinates of the embedded ring are monitored in real time. If the center deviation is found to be >3mm, the ring is immediately fine-tuned by a chain hoist to ensure that the concentricity of the embedded ring always meets the requirements.

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