A kind of bleacher seat air supply static pressure box and its construction method

Abstract

The present application relates to an air supply static pressure box for stand seats, comprising two first concrete columns and two second concrete columns, and a first structural crossbeam is fixedly connected between the two first concrete columns, a second structural crossbeam is fixedly connected between the two second concrete columns, a stepped stand is fixedly connected between the first structural crossbeam and the second structural crossbeam, two structural oblique folding beams are fixedly connected between the first structural crossbeam and the second structural crossbeam, and the two structural oblique folding beams are respectively fixedly connected to the side walls of the stepped stand, and the opposite side walls of the two structural oblique folding beams are respectively fixedly connected to a suspension mechanism, and the suspension mechanism is fixedly connected to a ceiling mechanism, one end of the ceiling mechanism is fixedly connected to the first concrete column, and the other end is fixedly connected to the second structural crossbeam, the stepped stand is provided with an air supply port, and the ceiling mechanism is provided with an air inlet duct. The present application has the effect of improving the airtightness of the static pressure box.

Description

Technical Field

[0001] The present application relates to the field of ventilation equipment, and in particular to a plenum box for air supply to stands and seats and a construction method thereof. Background Art

[0002] In recent years, in order to improve people's quality of life, my country has built many sports and cultural buildings such as gymnasiums and theaters. Such buildings are generally tall and large spaces, with stepped seating in the audience area and high population density, and the air conditioning system mostly adopts the airflow organization form of seat air supply. Among them, seat air supply is a specific form of displacement ventilation. An integral air supply static pressure box is set under the stepped seats in the audience area. The treated air is introduced into the air supply static pressure box through the air duct and sent to the audience through the seat air outlet, thereby improving the air in the audience area.

[0003] Usually, an active passage such as an athlete's locker room or a corridor is set up under the static pressure box, so a suspended ceiling is set under the bottom of the static pressure box, and the upper end of the suspension rod used to fix the suspended ceiling is fixed to the lower surface of the stand, and then the suspension rod is penetrated through the bottom of the static pressure box to fix the lower end of the suspension rod to the suspended ceiling.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: a number of ceiling hangers penetrate the bottom of the static pressure box, which easily causes poor airtightness of the static pressure box, thereby causing air leakage and insufficient air pressure in the static pressure box. Summary of the invention

[0005] In order to improve the airtightness of the static pressure box, the present application provides a grandstand seat air supply static pressure box and a construction method thereof.

[0006] In the first aspect, the present application provides a plenum box for air supply to a grandstand seat, which adopts the following technical solution:

[0007] A static pressure box for air supply of stands and seats, comprising two first concrete columns and two second concrete columns, wherein a first structural crossbeam is fixedly connected between the two first concrete columns, a second structural crossbeam is fixedly connected between the two second concrete columns, a stepped stand is fixedly connected between the first structural crossbeam and the second structural crossbeam, two structural oblique folding beams are fixedly connected between the first structural crossbeam and the second structural crossbeam, and the two structural oblique folding beams are respectively fixedly connected to the side walls of the stepped stand, and the opposite side walls of the two structural oblique folding beams are respectively fixedly connected to a suspension mechanism, the suspension mechanism is fixedly connected to a ceiling mechanism, one end of the ceiling mechanism is fixedly connected to the first concrete column, and the other end is fixedly connected to the second structural crossbeam, the ceiling mechanism, the stepped stand and the structural oblique folding beams enclose a static pressure box with an air supply space, the stepped stand is provided with an air supply port, and the ceiling mechanism is provided with an air inlet duct.

[0008] By adopting the above technical solution, the suspension mechanism is directly fixed on the structural oblique folded beam, and then the ceiling mechanism is fixed to the suspension mechanism, so that the suspension mechanism can suspend the ceiling mechanism. Not only does the ceiling mechanism and the structural oblique folded beams on both sides and the stepped stands form a static pressure box, but also when the ceiling is to be built, there is no need to penetrate the bottom of the static pressure box with the suspension rod. The ceiling mechanism can bear the weight of the ceiling, thereby improving the airtightness of the static pressure box.

[0009] Optionally, the suspension mechanism includes a plurality of embedded plates respectively fixedly connected to opposite side walls of the two structural oblique folding beams, the embedded plates are fixedly connected to the suspension rods, and the ceiling mechanism is fixedly connected to the suspension rods.

[0010] By adopting the above technical solution, a plurality of embedded plates are fixed on the inner wall of the structural oblique folding beam, and then the suspension rods are fixed on the embedded plates, so that the plurality of suspension rods can pull up the ceiling mechanism more stably.

[0011] Optionally, the suspended ceiling mechanism includes a support rod fixedly connected between two relatively suspended rods, and a plurality of connecting rods are fixedly connected between two adjacent support rods, wherein the support rod close to the first concrete column is fixedly connected to the side wall of the first concrete column, and the support rod close to the second concrete column is fixedly connected to the second structural beam, the connecting rod and the upper surface of the support rod are commonly fixedly connected with a closing plate, the first structural beam is fixedly connected with a fixing plate, the fixing plate is fixedly connected to the support rod close to the first concrete column, and the air inlet duct is fixedly penetrated through the fixing plate.

[0012] By adopting the above technical solution, two adjacent support rods are fixed together by connecting rods, so that several support rods and suspension rods can be fixed into a whole. At the same time, the support rods near the upper and lower ends of the stepped stands are fixedly connected to the first concrete column and the second structural beam respectively, so that the skeleton formed by the support rods and the connecting rods is more stable.

[0013] Optionally, the first structural cross beam is fixedly connected to a plurality of reinforcing rods, and the reinforcing rods are fixedly connected to support rods close to the first concrete column.

[0014] By adopting the above technical solution and arranging a reinforcing rod to connect the support rod with the first structural cross beam, the support rod can be more stable and can bear more weight.

[0015] Optionally, a heat preservation plate is fixedly connected to the upper surface of the closing plate.

[0016] By adopting the above technical solution, the heat preservation plate is fixed on the closing plate, thereby reducing condensation on the inner surface of the static pressure box.

[0017] Optionally, an inorganic fiber sprayed sound-absorbing layer is provided on the lower surface of the stepped stand.

[0018] By adopting the above technical solution, the inorganic fiber spray sound-absorbing layer can play the role of sound absorption, heat preservation and fire protection, reduce the noise generated when the static pressure box is working, and enable the static pressure box to operate more safely and smoothly.

[0019] Optionally, the embedded plate is provided with a plurality of screws, and one end of the screw facing the structural oblique fold beam is fixedly connected to a truncated cone-shaped extension block, the outer wall of the extension block is spirally surrounded by spiral strips, and the end of the screw away from the extension block is fixedly connected to an abutment plate, and the abutment plate abuts against the side of the embedded plate away from the structural oblique fold beam.

[0020] By adopting the above technical solution, the screw rod can be first passed through the embedded plate, and the end of the extension block can be contacted with the side wall of the structural oblique fold beam. Then, the screw rod can be rotated to drive the extension block to rotate into the structural oblique fold beam, so that the abutment plate is pressed against the side wall of the embedded plate, thereby fixing the embedded plate on the structural oblique fold beam.

[0021] Optionally, the screw rod and the extension block are both hollow and have openings at both ends; a stabilizing rod coaxial with the screw rod and the extension block is slidably inserted inside; one end of the stabilizing rod extending out of the extension block is fixedly connected to a conical cone block; the end of the stabilizing rod facing away from the cone block extends out of the side wall of the abutment plate; a convex ridge is fixedly connected to the side wall of the stabilizing rod; a groove for the convex ridge to slide is formed on the inner wall of the screw rod; a plurality of long reinforcing ribs are fixedly connected to the outer wall of the cone block; and the plurality of reinforcing ribs are arranged circumferentially along the cone block.

[0022] By adopting the above technical solution, when the screw is rotated, since the convex edge is located in the groove, the screw drives the stabilizing rod to rotate as a whole, so that the cone block can penetrate into the structural oblique fold beam. After the screw is rotated into the structural oblique fold beam, and the abutment plate is pressed against the embedded plate, a hammer can be used to hit the stabilizing rod, so that the stabilizing rod drives the cone block to hit a deeper position of the structural oblique fold beam, and the reinforcing ribs can reinforce the cone block, so that the cone block can be more stable and strong, and the contact area between the cone block and the structural oblique fold beam is increased, so that the screw can more stably fix the embedded plate and the structural oblique fold beam.

[0023] In the second aspect, the present application provides a construction method for a plenum box for air supply to a grandstand seat, which adopts the following technical solution:

[0024] A construction method for a bleacher seat air supply static pressure box comprises the following steps:

[0025] S1, locate the position of each embedded plate by measuring and laying out, and then fix each embedded plate on the structural oblique folding beam;

[0026] S2, fix the upper end of the suspension rod to the embedded plate, and then fix the support rod between the two opposite suspension rods;

[0027] S3, fixing a plurality of connecting rods between two adjacent supporting rods at equal distances, and making the connecting rods flush with the surfaces of the supporting rods;

[0028] S4, fixing and laying the closing plate on the connecting rod and making the surface of the closing plate flat, and fixing the fixing plate between the first structural beam and the supporting rod close to the first concrete column;

[0029] S5, fixing the insulation board to the closing board by insulation nails;

[0030] S6, perform sound absorption and heat preservation treatment on the corners of the static pressure box and seal the joints;

[0031] S7, test the wind pressure, wind speed and anti-condensation of the static pressure box to complete the acceptance.

[0032] By adopting the above technical scheme, the position of each embedded plate is determined by measuring and positioning, so that each embedded plate is equidistantly arranged, and then the embedded plate is fixed on the structural oblique folded beam, and the upper end of the suspension rod is fixed to the side wall of the embedded plate, and the support rod is fixed between the two opposite suspension rods, and then the connecting rod is fixed between the two adjacent support rods, and the closing plate is fixed and laid on the upper surface of the connecting rod, and the fixed plate is fixed between the first structural beam and the support rod close to the first concrete column, so that the static pressure box constitutes a closed space structure, and then the insulation board is fixed on the closing board to reduce condensation on the inner surface of the static pressure box, and the corners and joints of the static pressure box are sealed, sound-absorbing and heat-insulated, and finally the static pressure box is tested and accepted.

[0033] Optionally, after a number of connecting rods are fixed to two adjacent supporting rods, an inorganic fiber spray sound-absorbing layer is constructed on the lower surface of the stepped stand.

[0034] By adopting the above technical solution and constructing an inorganic fiber sprayed sound-absorbing layer, the sound-absorbing layer has the advantages of sound absorption, heat preservation and fire prevention.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] The suspension mechanism is directly fixed on the structural oblique folded beam, and then the ceiling mechanism is fixed to the suspension mechanism, so that the suspension mechanism can suspend the ceiling mechanism. Not only does the ceiling mechanism and the structural oblique folded beams on both sides and the stepped stands form a static pressure box, but also when the ceiling is to be built, there is no need to penetrate the bottom of the static pressure box with the suspension rod. The ceiling mechanism can bear the weight of the ceiling, thereby improving the airtightness of the static pressure box.

[0037] By fixing the insulation board on the closing plate, condensation on the inner surface of the static pressure box is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0039] Figure 2 It is a structural schematic diagram of the suspension mechanism and the ceiling mechanism in Example 1 of the present application.

[0040] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A.

[0041] Figure 4 It is an exploded view of the bottom of the static pressure box in Example 1 of the present application.

[0042] Figure 5 It is a schematic diagram of the structure of the screw in Example 2 of the present application.

[0043] Explanation of the reference numerals in the accompanying drawings: 1. first concrete column; 2. second concrete column; 11. first structural crossbeam; 21. second structural crossbeam; 3. stepped stands; 31. air outlet; 4. structural oblique folded beam; 5. suspension mechanism; 6. ceiling mechanism; 60. air inlet duct; 51. buried plate; 52. suspension rod; 61. support rod; 62. connecting rod; 32. inorganic fiber sprayed sound-absorbing layer; 7. closing plate; 71. thermal insulation cotton; 72. fixing plate; 73. reinforcing rod; 8. screw rod; 81. extension block; 82. spiral strip; 83. abutment plate; 9. stabilizing rod; 91. convex ridge; 92. groove; 93. cone block; 94. reinforcing rib. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-5 This application is described in further detail.

[0045] Embodiment 1:

[0046] The present application embodiment discloses a plenum box for bleacher seats. Figure 1 and Figure 2 A plenum box for air supply of a grandstand seat comprises two first concrete columns 1 which are vertical and aligned with each other, and two second concrete columns 2 which are vertical and aligned with each other, wherein the first concrete column 1 is higher than the second concrete column 2, and a first structural beam 11 which is horizontal is cast between the two first concrete columns 1 and at the upper end, and a second structural beam 21 which is horizontal is cast between the two second concrete columns 2 and at the upper end. Thus, a stepped grandstand 3 can be cast between the first structural beam 11 and the second structural beam 21, and the stepped grandstand 3 is composed of a plurality of vertical plates and a plurality of horizontal plates which are continuously and vertically connected to each other, and a plurality of air supply ports 31 are opened in the horizontal direction on the vertical plates of the stepped grandstand 3. Secondly, two structural oblique folding beams 4 are cast between the first structural beam 11 and the second structural beam 21, and the two structural oblique folding beams 4 are cast on both sides of the stepped grandstand 3, and the structural oblique folding beams 4 are composed of three sections: a horizontal section, an inclined section, and a horizontal section, wherein the inclined section is arranged along the step direction of the stepped grandstand 3.

[0047] Reference Figure 2 The opposite side walls of the two structural oblique folded beams 4 are respectively fixed with a suspension mechanism 5, and the suspension mechanism 5 is fixed with a ceiling mechanism 6. One end of the ceiling mechanism 6 is fixed to the first concrete column 1, and the other end is fixed to the second structural cross beam 21, so that the ceiling mechanism 6, the stepped grandstand 3 and the structural oblique folded beams 4 form a static pressure box with an air supply space, and the ceiling mechanism 6 is provided with an air inlet duct 60.

[0048] Reference Figure 3 The suspension mechanism 5 includes a plurality of embedded plates 51 respectively fixedly connected to the opposite side walls of the two structural oblique folding beams 4. The plurality of embedded plates 51 are equidistantly arranged along the three length directions of the structural oblique folding beams 4. At the same time, the embedded plates 51 on the two structural oblique folding beams 4 are aligned one by one, and the embedded plates 51 and the structural oblique folding beams 4 are fixed in a manner of first drilling holes on the structural oblique folding beams 4, and then using expansion screws to fix the embedded plates 51 on the structural oblique folding beams 4. A vertical suspension rod 52 is welded to the side wall of the embedded plate 51, and the suspension rod 52 is made of 10# channel steel.

[0049] Reference Figure 2 and Figure 3 The suspension rods 52 on the two structural oblique folding beams 4 are aligned one by one, and the ceiling mechanism 6 includes a support rod 61 welded between the corresponding two suspension rods 52, and the support rod 61 is welded to the lower end of the suspension rod 52 and is arranged horizontally, so that the length direction of the plurality of support rods 61 is parallel to the width direction of the terrace 3, and the support rod 61 adopts a 180*100*6 square steel tube. A plurality of horizontal connecting rods 62 are welded between two adjacent support rods 61, and the connecting rod 62 adopts a 40*40*4 angle steel, and the connecting rod 62 is arranged vertically with the support rod 61, and the angle steel opening faces downward, so that the upper surface of the angle steel is flat with the upper surface of the square steel, and at the same time, a plurality of connecting rods 62 are arranged along the length direction of the support rod 61 at a spacing of 1.2m. A support rod 61 close to the first concrete column 1 is fixed to the side wall of the first concrete column 1 by bonding mortar, and a support rod 61 close to the second concrete column 2 is fixed to the side wall of the second structural beam 21 by bonding mortar, so that the support rod 61 and the connecting rod 62 form a steel skeleton structure.

[0050] Reference Figure 3 Secondly, an inorganic fiber spray sound-absorbing layer 32 is arranged on the lower surface of the stepped stand 3, and the inorganic fiber spray is mainly composed of inorganic fiber and water-based adhesive. After mixing, it is sprayed through an air compressor pump and mixed with atomized water and sprayed onto the lower surface of the stepped stand 3 to form a coating, which has the effect of heat preservation, sound absorption and fire prevention.

[0051] Reference Figure 2 and Figure 4A closing plate 7 is fixedly connected to the upper surface of the connecting rod 62 and the supporting rod 61 by self-tapping screws, and the closing plate 7 is made of galvanized iron sheet, and the surface of the closing plate 7 is flat. A thermal insulation cotton 71 is fixed to the closing plate 7, and the thermal insulation cotton 71 is made of 475 / 800 series glass wool direct duct sheet, and the thermal insulation cotton 71 is fixed to the closing plate 7 by using thermal insulation nails.

[0052] Reference Figure 2 and Figure 4 , Secondly, a vertical fixing plate 72 is fixed to the side wall of the first structural beam 11 by expansion screws, and the fixing plate 72 is made of galvanized iron sheet, and the lower end of the fixing plate 72 is welded to the support rod 61 fixed to the first concrete column 1. A plurality of vertical reinforcing rods 73 are fixed to the lower surface of the first structural beam 11 by expansion screws, and the plurality of reinforcing rods 73 are arranged equidistantly along the length direction of the first structural beam 11, and the reinforcing rods 73 are arranged on the side of the fixing plate 72 away from the terraced stands 3, and the lower end of the reinforcing rods 73 is welded to the support rod 61 fixed to the first concrete column 1. Secondly, the air inlet duct 60 is welded and penetrated through the side wall of the fixing plate 72, so that the external air conditioning system can be connected to the air inlet duct 60 to deliver air to the static pressure box.

[0053] The embodiment of the present application also discloses a construction method for a static pressure box for air supply of a grandstand seat, and the construction method includes the following steps: S1, by measuring and positioning, the buried plates 51 are arranged at equal intervals to determine the positions, and holes are punched in the side walls of the structural oblique folded beams 4, and the buried plates 51 are fixed with expansion screws; S2, the upper ends of the suspension rods 52 are welded to the side walls of the buried plates 51, and the suspension rods 52 are arranged vertically, and horizontal support rods 61 are welded between the corresponding two suspension rods 52 and at the lower ends thereof, so that a plurality of support rods 61 form a grid structure; S3, a plurality of connecting rods 62 are welded at equal intervals between two adjacent support rods 61, and the connecting rods 62 are arranged vertically with the support rods 61, and the upper surfaces of the connecting rods 62 and the support rods 61 are flush, and then the lower surface of the stepped grandstand 3 is subjected to inorganic fiber welding. Construction of spraying sound-absorbing layer 32; S4, fix the closing plate 7 to the connecting rod 62 with self-tapping screws, and make the surface of the closing plate 7 flat, and fix the upper end of the fixing plate 72 to the first structural beam 11 with expansion screws, weld the lower end of the fixing plate 72 to the support rod 61 close to the first concrete column 1, and fix the air inlet pipe 60 to the fixing plate 72 to transport the external treated air from the air inlet pipe 60 to the static pressure box; S5, fix the insulation plate to the upper surface of the closing plate 7 with insulation nails to reduce condensation on the inner surface of the static pressure box; S6, fill and seal the corners of the static pressure box, and perform sound absorption and heat preservation treatment, and seal each joint of the static pressure box; S7, finally test the wind pressure, wind speed and anti-condensation of the static pressure box, and finally complete the acceptance.

[0054] Embodiment 2:

[0055] Reference Figure 5 The difference between this embodiment and the first embodiment is that: a plurality of horizontal screw rods 8 are slidably penetrated through the buried plate 51, and a truncated cone-shaped extension block 81 is welded to one end of the screw rod 8 facing the structural oblique fold beam 4, the extension block 81 is coaxially arranged with the screw rod 8, and the maximum diameter of the extension block 81 is welded to the end face of the screw rod 8, the outer wall of the extension block 81 is spirally surrounded by a spiral strip 82, and a vertical abutment plate 83 is welded to one end of the screw rod 8 away from the extension block 81, so that when the screw rod 8 is penetrated through the buried plate 51, the side wall of the abutment plate 83 facing the structural oblique fold beam 4 can abut against the side wall of the buried plate 51 away from the structural oblique fold beam 4.

[0056] Reference Figure 5 , Secondly, the screw rod 8 and the extension block 81 are both hollow and have openings at both ends. A horizontal stabilizing rod 9 is inserted in the inner cavity of the screw rod 8 and the extension block 81 along the axial direction, and the length of the stabilizing rod 9 is greater than the total length of the screw rod 8 and the extension block 81, so that one end of the stabilizing rod 9 extends out of the extension block 81, and the other end extends out of the abutment plate 83. A convex rib 91 is welded along the axial direction of the end of the stabilizing rod 9 close to the abutment plate 83. A groove 92 for the convex rib 91 to slide is opened along the axial direction of the inner wall of the screw rod 8, and the length of the groove 92 is greater than the length of the convex rib 91. A conical block 93 is welded at one end of the stabilizing rod 9 extending out of the opening of the extension block 81, and the conical block 93 is coaxial with the extension block 81, and the maximum diameter of the conical block 93 is equal to the minimum diameter of the extension block 81. Three reinforcing ribs 94 are welded on the outer wall of the conical block 93, and the reinforcing ribs 94 are arranged in a long strip shape, and the three reinforcing ribs 94 are arranged equidistantly along the circumference of the conical block 93.

[0057] The implementation principle of the second embodiment of the present application is: before fixing the embedded plate 51, first abut the cone block 93 against the end face of the extension block 81, then slide the screw 8 through the embedded plate 51, and then rotate the abutment plate 83, so that the screw 8 drives the extension block 81 and the cone block 93 to rotate into the structural oblique folded beam 4, and the abutment plate 83 can be tightly abutted against the embedded plate 51, and then use a hammer to knock the end of the stabilizing rod 9 extending out of the abutment plate 83, so that the stabilizing rod 9 moves along the axial direction of the screw 8 toward the direction close to the structural oblique folded beam 4, so that the stabilizing rod 9 drives the cone block 93 to drill into a deeper position of the structural oblique folded beam 4, so that the screw 8 can be more stably fixed on the structural oblique folded beam 4, thereby stably fixing the embedded plate 51.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A plenum box for air supply to a grandstand seat, characterized in that: The invention comprises two first concrete columns (1) and two second concrete columns (2), wherein a first structural cross beam (11) is fixedly connected between the two first concrete columns (1), a second structural cross beam (21) is fixedly connected between the two second concrete columns (2), a stepped grandstand (3) is fixedly connected between the first structural cross beam (11) and the second structural cross beam (21), two structural oblique folding beams (4) are fixedly connected between the first structural cross beam (11) and the second structural cross beam (21), and the two structural oblique folding beams (4) are respectively fixedly connected to the stepped grandstand (3). The side walls of the two sides of the structure are fixedly connected to the opposite side walls of the two structural oblique folding beams (4), and the suspension mechanisms (5) are fixedly connected to the ceiling mechanisms (6). One end of the ceiling mechanisms (6) is fixedly connected to the first concrete column (1), and the other end is fixedly connected to the second structural cross beam (21). The ceiling mechanisms (6), the stepped grandstand (3) and the structural oblique folding beams (4) enclose a static pressure box having an air supply space. The stepped grandstand (3) is provided with an air supply port (31), and the ceiling mechanisms (6) are provided with an air inlet pipe (60); The suspension mechanism (5) comprises a plurality of embedded plates (51) respectively fixedly connected to opposite side walls of the two structural oblique folding beams (4); the embedded plates (51) are fixedly connected to suspension rods (52); and the ceiling suspension mechanism (6) is fixedly connected to the suspension rods (52); The lower surface of the stepped stand (3) is provided with an inorganic fiber sprayed sound-absorbing layer (32).

2. The bleacher seat air supply static pressure box according to claim 1, characterized in that: The ceiling mechanism (6) comprises a support rod (61) fixedly connected between two relatively opposite suspension rods (52), a plurality of connecting rods (62) fixedly connected between two adjacent support rods (61), wherein the support rod (61) close to the first concrete column (1) is fixedly connected to the side wall of the first concrete column (1), and the support rod (61) close to the second concrete column (2) is fixedly connected to the second structural cross beam (21), the connecting rod (62) and the upper surface of the support rod (61) are fixedly connected to a closing plate (7), the first structural cross beam (11) is fixedly connected to a fixing plate (72), the fixing plate (72) is fixedly connected to the support rod (61) close to the first concrete column (1), and the air inlet pipe (60) is fixedly arranged through the fixing plate (72).

3. The bleacher seat air supply static pressure box according to claim 2, characterized in that: The first structural cross beam (11) is fixedly connected to a plurality of reinforcing rods (73), and the reinforcing rods (73) are fixedly connected to support rods (61) close to the first concrete column (1).

4. The bleacher seat air supply static pressure box according to claim 2, characterized in that: A heat preservation plate is fixedly connected to the upper surface of the closing plate (7).

5. The bleacher seat air supply static pressure box according to claim 1, characterized in that: The embedded plate (51) is provided with a plurality of screw rods (8); one end of the screw rod (8) facing the structural oblique folding beam (4) is fixedly connected to a truncated cone-shaped extension block (81); the outer wall of the extension block (81) is spirally surrounded by a spiral strip (82); one end of the screw rod (8) facing away from the extension block (81) is fixedly connected to an abutment plate (83); the abutment plate (83) abuts against a side of the embedded plate (51) facing away from the structural oblique folding beam (4).

6. The bleacher seat air supply static pressure box according to claim 5, characterized in that: The screw rod (8) and the extension block (81) are both hollow and have openings at both ends. A stabilizing rod (9) coaxial with the screw rod (8) is slidably inserted in the extension block (81). One end of the stabilizing rod (9) extending out of the extension block (81) is fixedly connected to a conical cone block (93). One end of the stabilizing rod (9) facing away from the cone block (93) extends out of the side wall of the abutment plate (83). The side wall of the stabilizing rod (9) is fixedly connected to a ridge (91). The inner wall of the screw rod (8) is provided with a groove (92) for the ridge (91) to slide. The outer wall of the cone block (93) is fixedly connected to a plurality of long reinforcing ribs (94). The plurality of reinforcing ribs (94) are arranged circumferentially along the cone block (93).

7. A construction method for the air supply static pressure box of any one of claims 1 to 6, characterized in that: The following steps are included: S1, positioning each embedded plate (51) by measuring and laying out, and then fixing each embedded plate (51) on the structural oblique folding beam (4); S2, fixing the upper ends of the suspension rods (52) to the buried plate (51), and then fixing the support rod (61) between the two opposite suspension rods (52); S3, fixing a plurality of connecting rods (62) between two adjacent supporting rods (61) at equal distances, and making the surfaces of the connecting rods (62) and the supporting rods (61) flush; S4, fixing the closing plate (7) on the connecting rod (62) and making the surface of the closing plate (7) flat, and fixing the fixing plate (72) between the first structural beam (11) and the supporting rod (61) close to the first concrete column (1); S5, fixing the insulation board to the closing board (7) by means of insulation nails; S6, perform sound absorption and heat preservation treatment on the corners of the static pressure box and seal the joints; S7, test the wind pressure, wind speed and anti-condensation of the static pressure box to complete the acceptance.

8. The construction method of the plenum box for air supply of a grandstand seat according to claim 7, characterized in that: After a plurality of connecting rods (62) are fixed to two adjacent supporting rods (61), an inorganic fiber spray-coated sound-absorbing layer (32) is constructed on the lower surface of the stepped stand (3).

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