A kind of tunnel flat guide smoke exhaust passage's baffle unit, structure and construction method

Abstract

The application discloses a kind of tunnel flat guide smoke exhaust passage's partition unit, structure and construction method, wherein partition unit includes stressed beam, partition plate, stressed beam embedded groove and partition plate embedded groove, stressed beam embedded groove is symmetrically set in flat guide side wall along flat guide axis, partition plate embedded groove is symmetrically set in flat guide side wall along flat guide axis, two ends of stressed beam are inserted stressed beam embedded groove respectively, the number of partition plate is at least two, all partition plate is placed on stressed beam and is distributed transversely in flat guide, and partition plate close to flat guide side wall extends into partition plate embedded groove.The application realizes whole into parts by adopting the scheme of plate beam superposition, stressed beam, partition plate size is small, and weight is light, both save material consumption, and save tunnel space again.Set stressed beam embedded groove and partition plate embedded groove, reduce construction procedure, enhance structural stability.Only simple, light lifting equipment can complete beam plate erection, meet the demand of construction in narrow tunnel, improve construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel engineering, and in particular to a baffle unit, structure and construction method of a tunnel flat guide smoke exhaust passage. BACKGROUND

[0002] Due to the influence of tunnel length, environmentally sensitive areas, construction period, ventilation and other factors, a tunnel flat guide is usually added to tunnels of more than 5 km, which is usually locally arranged, such as a flat guide or an inclined shaft with a length of 500-1000 m, and important tunnels even have a tunnel flat guide with the full length. The function of the tunnel flat guide is to meet the needs of smoke exhaust and ventilation of the main tunnel. The tunnel flat guide meets the needs of smoke exhaust and ventilation of the main tunnel by arranging a flat baffle at about 3 / 4 of the height of the tunnel flat guide to form an exhaust passage with good air tightness with the annular wall of the tunnel.

[0003] The smoke exhaust passage baffle of the prior art tunnel flat guide is to erect a support in the tunnel flat guide 6, and to cast a 12 cm thick reinforced concrete slab 7 (C30) on the support. Figure 1 However, this construction method needs to erect and remove the support, and needs to remove the formwork. The support occupies the tunneling passage, and the construction efficiency is low and the construction cost is high, which is difficult to meet the needs of modern construction progress. In addition, the working environment in the tunnel is poor, the labor intensity of this scheme is large, the labor cost is increased, and the construction quality is difficult to control.

[0004] Later, a 6 cm thick high-strength prefabricated slab 8 is proposed to replace the cast-in-place slab baffle. Figure 2 To meet the size requirements of the tunnel flat guide, the transverse width of the high-strength prefabricated slab 8 is at least 6 m. For a concrete slab with a large planar size but a thin thickness, the bending strength requirement is extremely high, and it needs to withstand the deformation and cracking risk during transportation. It is difficult to implement, and the cost of the prefabricated slab that meets the requirements is extremely high, which exceeds the value of an auxiliary structure. SUMMARY

[0005] The present application aims to overcome the problems of large overall weight of the baffle structure, difficult installation and removal, and low construction efficiency in the prior art, and provides a baffle unit, structure and construction method of a tunnel flat guide smoke exhaust passage.

[0006] To achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0007] The application discloses a partition plate unit of a tunnel flat guide smoke exhaust channel.

[0008] The partition plate unit of the tunnel flat guide smoke exhaust channel is designed by combining the partition plate and the force bearing beam, the force bearing beam is arranged on the two side walls of the flat guide and is perpendicular to the axis of the flat guide, a plurality of partition plates are arranged on the force bearing beam and are distributed transversely in the flat guide, the force bearing beam mainly bears the pressure, and the partition plate only bears the weight of the partition plate and the weight of the maintenance personnel, the partition plate and the force bearing beam have clear division of labor, so that the thinner partition plate can be used.

[0009] Preferably, a U-shaped groove is arranged between the adjacent partition plates, and the U-shaped groove is filled with a joint filling material.

[0010] By arranging the U-shaped groove and filling the U-shaped groove with the joint filling material after the erection, the connection between the partition plates is ensured to be compact, and the air tightness of the smoke exhaust channel is improved.

[0011] Preferably, a prestressed tendon is arranged in the force bearing beam, and the prestressed tendon is arranged downwardly offset along the center line of the force bearing beam.

[0012] Since the force bearing beam needs to bear a large gravity and is a main force bearing component, the beam body structure needs to be strengthened and the prestress is tensioned. By arranging the prestressed tendon downwardly offset along the center line of the force bearing beam, the internal force caused by the gravity and external load of the force bearing beam and the deformation resistance can be better balanced.

[0013] Preferably, the partition plate unit of the tunnel flat guide smoke exhaust channel further comprises a support part, the support part is fixed to the side wall of the flat guide, the support part is located at the lower part of the force bearing beam embedded groove, and the support part is used for supporting the force bearing beam embedded groove.

[0014] The support part fixed to the side wall of the flat track is added to improve the pressure bearing capacity of the embedded groove of the stress beam and ensure the stability of the overall structure.

[0015] Preferably, the embedded groove of the stress beam and the embedded groove of the partition plate are both cast in the second lining of the flat track.

[0016] Casting the embedded groove of the stress beam and the embedded groove of the partition plate in the second lining of the flat track can further improve the anchoring performance of the partition plate structure of the flat track smoke exhaust channel, making the overall structure better and the bearing capacity stronger.

[0017] A partition plate structure of a tunnel flat track smoke exhaust channel comprises at least two partition plate units of the tunnel flat track smoke exhaust channel, and all the partition plate units are continuously distributed along the flat track axis.

[0018] Preferably, the interval distance between the stress beams, the interval distance between the embedded grooves of the stress beams, and the length of the embedded groove of the partition plate are all the same as the length of the partition plate.

[0019] With this structure, it can be ensured that the stress beam can be inserted into the embedded groove of the stress beam, the partition plate can be placed in the embedded groove of the partition plate, and the partition plate can be erected on the stress beam, thereby ensuring the installation quality and overall sealing performance of the structure.

[0020] A construction method of a partition plate structure of a tunnel flat track smoke exhaust channel comprises the following steps:

[0021] S1. Casting the embedded groove of the stress beam and the embedded groove of the partition plate in the side wall of the flat track;

[0022] S2. Inserting both ends of the stress beam into the corresponding embedded groove of the stress beam;

[0023] S3. Installing the partition plate on the stress beam, and extending the partition plate close to the side wall of the flat track into the embedded groove of the partition plate;

[0024] S4. Completing the construction of the partition plate structure of the tunnel flat track smoke exhaust channel.

[0025] With the construction method of the partition plate structure of the tunnel flat track smoke exhaust channel provided by the application and the partition plate structure of the tunnel flat track smoke exhaust channel provided by the application, the construction can be conveniently and quickly performed, the beam plate erection can be completed only by using simple and light lifting equipment, the construction requirements in a narrow tunnel can be met, the construction efficiency is improved, and the construction period is shortened.

[0026] Preferably, the embedded groove of the stress beam and the embedded groove of the partition plate are both cast in the second lining of the flat track, and the S1 comprises the following steps:

[0027] S11. A telescopic rod is used to support a first temporary formwork, the first temporary formwork is built into a first slot-shaped structure for one end of the force beam to be inserted into, and a sealing formwork is used to close the slot opening of the first slot-shaped structure; a second temporary formwork is built into a second slot-shaped structure for the long side of the partition plate to be inserted into; the upper part of the embedded groove of the force beam is reserved with a notch for the second slot-shaped structure to be inserted into, and after the construction of two first slot-shaped structures is completed, the second slot-shaped structure is placed between the adjacent two notches;

[0028] S12. The second lining of the flat guide is poured with concrete, and after the concrete reaches the design strength, the telescopic rod is shortened, the first temporary formwork and the sealing formwork are removed, and the embedded groove of the force beam is formed; the second temporary formwork is removed, and the embedded groove of the partition plate is formed.

[0029] Preferably, a U-shaped groove is arranged between adjacent partition plates, the U-shaped groove is filled with a caulking material, and the S3 comprises the following steps:

[0030] S31. Pouring the U-shaped groove between the partition plates resting on the force beam in the transverse direction in the flat guide and the joint between the partition plates and the second lining of the flat guide;

[0031] S32. Pouring the U-shaped groove of the partition plate between the adjacent two spans of the force beam.

[0032] By using this pouring method, the integrity of the partition plate poured first is better, the load-bearing capacity of the partition plate is fully utilized, the construction personnel and construction equipment can safely pass through, the deformation between the partition plates is released in advance, and then the U-shaped groove of the partition plate between the adjacent two spans of the force beam is poured, so that the internal force state of the overall structure is optimized.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] 1.A partition structure of a tunnel flat guide smoke exhaust passage according to the present application, comprising a plurality of partition units distributed continuously along the tunnel axis, wherein the partition unit of the tunnel flat guide smoke exhaust passage adopts a scheme of superimposing a partition plate and a force beam, the force beam is arranged perpendicularly to the tunnel axis and connected to the two side walls of the flat guide, and a plurality of partition plates are placed on the force beam and distributed transversely in the flat guide, the force beam is mainly responsible for supporting the partition plates, and the partition plates only need to bear their own weight and the weight of maintenance personnel, the partition plate and the force beam have clear division of labor, so that a partition plate with a certain length, width and thinness can be adopted. The scheme of superimposing the plate and the beam realizes the division of the whole into parts, the partition plate is designed into at least two, the force beam and the partition plate are small in size and light in weight, which saves the amount of material and the cost, and saves the tunnel space. Further, the force beam pre-embedded groove and the partition plate pre-embedded groove are pre-provided on the side walls of the flat guide, the force beam pre-embedded groove and the partition plate pre-embedded groove can be formed together with the tunnel lining by pouring, which reduces the construction process, enhances the structural integrity, and facilitates the installation of the force beam and the partition plate. The partition structure only needs simple and light hoisting equipment to complete the erection of the beam and the plate, meets the construction requirements in a narrow tunnel, and improves the construction efficiency.

[0035] 2.A construction method of a partition structure of a tunnel flat guide smoke exhaust passage according to the present application, which can be constructed simply and quickly by using the partition structure of the tunnel flat guide smoke exhaust passage according to the present application, only needs simple and light hoisting equipment to complete the erection of the beam and the plate, meets the construction requirements in a narrow tunnel, improves the construction efficiency, and shortens the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of using a reinforced concrete whole plate poured on site as a smoke exhaust passage partition plate in the background art;

[0037] Figure 2 is a schematic diagram of using a high-strength prefabricated plate as a smoke exhaust passage partition plate in the background art;

[0038] Figure 3 is a schematic diagram of a partition structure of a tunnel flat guide smoke exhaust passage according to the present application;

[0039] Figure 4 is an enlarged view of A in Figure 3

[0040] Figure 5 is a combined sectional view of the force beam and the partition plate;

[0041] Figure 6 is a combined elevation view of the force beam and the partition plate;

[0042] Figure 7 is a combined plan view of the force beam and the partition plate;

[0043] Figure 8 ​is the vertical section view of the force beam pre-embedded groove and the partition plate pre-embedded groove on the two sides;

[0044] Figure 9 is Figure 8 the A-A section view in the middle;

[0045] Figure 10 is Figure 8 the B-B section view in the middle;

[0046] Figure 11 is the vertical section view of the partition plate pre-embedded groove;

[0047] Figure 12 is Figure 11 the C-C section view in the middle.

[0048] The figure mark: 1-force beam, 2-partition plate, 21-U-shaped groove, 3-force beam pre-embedded groove, 31-rib plate, 32-flat plate, 33-expansion rod, 34-first temporary formwork, 35-sealing formwork, 4-partition plate pre-embedded groove, 41-second temporary formwork, 5-steel arch, 6-flat guide secondary lining, 7-reinforced concrete whole plate, 8-high-strength prefabricated plate. DETAILED DESCRIPTION

[0049] The present application will be described in detail below with reference to the drawings.

[0050] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0051] Example 1

[0052] As Figures 3-12As shown, a kind of tunnel flat guide smoke exhaust passage partition plate unit, including force beam 1, partition plate 2, force beam embedded groove 3 and partition plate embedded groove 4. Force beam embedded groove 3 is symmetrically set to the both sides of flat guide side wall along flat guide axis, partition plate embedded groove 4 is also symmetrically set to the both sides of flat guide side wall along flat guide axis.In this embodiment, partition plate 2 has 6 pieces, is made of high toughness concrete, its thickness is 2.5cm, length is 1.8m, width is 0.997m.The distance between two adjacent force beam 1 is 1.8m, same as the length of partition plate 2, the thickness of force beam 1 is 12cm, length is 6.30m, width is 10cm, and 6 pieces of partition plate 2 are set on two adjacent force beam 1 in the flat guide along the transverse direction, wherein the transverse direction is perpendicular to the axis direction of flat guide.The force beam embedded groove 3 is arranged at the interval in the side wall of flat guide, and the interval distance of two force beam embedded grooves 3 is 1.8m, same as the length of partition plate 2.Partition plate embedded groove 4 is arranged between two force beam embedded grooves 3.The two ends of force beam 1 are inserted into the corresponding force beam embedded groove 3.The length of partition plate embedded groove 4 is same as the length of partition plate 2, both are 1.8m, and the partition plate 2 close to the side wall of flat guide can extend into the partition plate embedded groove 4.

[0053] Preferably, in order to ensure the connection density between partition plates 2 and improve the air tightness of smoke exhaust passage, U-shaped grooves 21 are formed between the partition plates 2, and the gap formed by two adjacent U-shaped grooves 21 is filled with a filling material.

[0054] Since the force beam 1 needs to bear a large gravity and is a main force bearing member, the beam body structure needs to be strengthened and prestressed. Therefore, the force beam 1 is provided with prestressed tendons, and the force beam 1 is subjected to pretensioning method treatment through the prestressed tendons, and the tension control stress is 1395 MPa. The prestressed tendons are arranged along the center line of the force beam 1 and offset downward by 1 cm.

[0055] The partition plate structure of the tunnel flat guide smoke exhaust passage provided by the application further includes a support part located at the bottom of the force beam embedded groove 3 for enhancing the compression resistance of the force beam embedded groove 3. In this embodiment, the force beam embedded groove 3 and the partition plate embedded groove 4 are both cast in the second lining 6 of the flat guide, and the support part is also cast in the second lining 6 of the flat guide. The support part includes a rib plate 31, which is arranged in pairs in this embodiment, one end of which is welded to the steel arch 5, and the other end is welded to a flat plate 32. The thickness of the rib plate 31 is 12 mm, and the length of the surface welded to the steel arch 5 is 200 mm. The thickness of the flat plate 32 is 10 mm.

[0056] Embodiment 2

[0057] On the basis of embodiment 1, the application further provides a partition plate structure of a tunnel flat guide smoke exhaust passage, which includes at least two partition plate units of the tunnel flat guide smoke exhaust passage in embodiment 1, and all the partition plate units are continuously distributed along the axis of the flat guide to form the partition plate structure of the tunnel flat guide smoke exhaust passage.

[0058] Embodiment 3

[0059] A construction method of the partition structure of the tunnel flat guide smoke exhaust channel of embodiment 2 comprises the following steps:

[0060] S11. Before supporting the flat guide second lining 6 with the steel arch 5, the height of the rib plate 31 is determined on the surface of the steel arch 5, the rib plate 31 is welded on the steel arch 5, and every interval of the partition plate 2 length distance is arranged with a pair of rib plates 31, and the flat plate 32 is welded at the top end of each pair of rib plates 31.

[0061] The first temporary formwork 34 is supported by the telescopic rod 33 which can be extended / shortened, the first temporary formwork 34 is built into the first slot structure which can insert one end of the force bearing beam 1, the slot opening of the first slot structure is closed by the sealing formwork 35, and the first slot structure built by the first temporary formwork 34 is placed on the flat plate 3 which has been erected. The first temporary formwork 34 is a steel plate with a thickness of 5mm, and the inner net distance of the first slot structure is 110mm wide and 160mm high; the second temporary formwork 41 is built into the second slot structure which can insert the partition plate 2, and the upper part of the force bearing beam pre-buried slot 3 is left with a notch for the insertion of the second slot structure, and every time two force bearing beam pre-buried slots 3 are completed, the second slot structure is placed at the notch.

[0062] S12. The flat guide second lining 6 is poured with concrete, and after the concrete reaches the design strength, the telescopic rod 33 is shortened, the first temporary formwork and the sealing formwork 35 are removed, and the force bearing beam pre-buried slot 3 is formed; the second temporary formwork 41 is removed, and the partition plate pre-buried slot 4 is formed.

[0063] S2. One end of the force bearing beam 1 is inserted into one side of the force bearing beam pre-buried slot 3, then the force bearing beam 1 is rotated to insert the other end into the corresponding force bearing beam pre-buried slot 3, the position of the force bearing beam 1 is adjusted to make the force bearing beam 1 stable, and the installation of the force bearing beam 1 is completed.

[0064] S3. The position of the partition plate 2 is determined, the partition plate 2 is placed on the force bearing beam 1, and the partition plate 2 is slightly adjusted so that the partition plate 2 close to the flat guide side wall extends into the partition plate pre-buried slot 4.

[0065] S31. The U-shaped groove 21 between the partition plates 2 resting on the force bearing beam 1 along the transverse direction, i.e. perpendicular to the direction of the flat guide mileage, and the joint between the partition plate 2 and the flat guide second lining 6 is poured.

[0066] S32. The U-shaped groove 21 of the partition plate 2 between the two adjacent span force bearing beams 1 is poured.

[0067] S4. The construction of the partition structure of the tunnel flat guide smoke exhaust channel is completed.

[0068] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method of a tunnel flat guide smoke exhaust channel partition structure, characterized in that, the tunnel flat guide smoke exhaust channel partition structure comprises: at least two tunnel flat guide smoke exhaust channel partition units, all of which are continuously distributed along the flat guide axis; the tunnel flat guide smoke exhaust channel partition unit comprises: a force beam, a partition plate, a force beam embedded groove and a partition plate embedded groove, the force beam embedded groove is symmetrically arranged on the flat guide side wall along the flat guide axis, the partition plate embedded groove is symmetrically arranged on the flat guide side wall along the flat guide axis, the two ends of the force beam are respectively inserted into the force beam embedded groove, the number of the partition plates is at least two, all of which are placed on the force beam and are distributed transversely in the flat guide, and the partition plates close to the flat guide side wall extend into the partition plate embedded groove; the force beam embedded groove and the partition plate embedded groove are both cast in the flat guide second lining; the thickness of the partition plate is 2.5 cm; the length of the partition plate embedded groove is the same as the length of the partition plate; the tunnel flat guide smoke exhaust channel partition unit further comprises a support part, the support part is fixed to the flat guide side wall, the support part is located at the lower part of the force beam embedded groove, the support part is used for supporting the force beam embedded groove, the support part is cast in the flat guide second lining, the support part comprises a rib plate, the rib plates are arranged in pairs, one end is welded with a steel arch, the other end is welded with a flat plate, the thickness of the rib plate is 12 mm, the welding length with the surface of the steel arch is 200 mm, and the thickness of the flat plate is 10 mm; the construction method of the tunnel flat guide smoke exhaust channel partition structure comprises the following steps: S1. Pouring the force beam embedded groove and the partition plate embedded groove on the flat guide side wall; S1 comprises the following steps: S11. A telescopic rod is used to support a first temporary formwork, the first temporary formwork is built into a first slot-shaped structure for inserting one end of the force beam, a sealing formwork is used to close the slot of the first slot-shaped structure, a second temporary formwork is built into a second slot-shaped structure for placing the long side of the partition plate, the upper part of the force beam embedded groove is provided with a notch for inserting the second slot-shaped structure, and after completing the construction of two first slot-shaped structures, the second slot-shaped structure is placed between the adjacent two notches; S12. The flat guide second lining is poured with concrete, after the concrete reaches the design strength, the telescopic rod is shortened, the first temporary formwork and the sealing formwork are removed, and the force beam embedded groove is formed; the second temporary formwork is removed, and the partition plate embedded groove is formed; S2. The two ends of the force beam are inserted into the corresponding force beam embedded groove; S3. The partition plates are installed on the force beam, and the partition plates close to the flat guide side wall extend into the partition plate embedded groove; S4. The construction of the tunnel flat guide smoke exhaust channel partition structure is completed.

2. The construction method according to claim 1, characterized in that, a U-shaped groove is formed between adjacent partition plates, the U-shaped groove is filled with a joint filling material, and S3 comprises the following steps: S31. Pouring the U-shaped groove between the partition plates placed on the force beam in the flat guide along the transverse direction, and the joint between the partition plate and the flat guide second lining; S32. Pouring the U-shaped groove of the partition plate between two adjacent spans of the force bearing beam.

3. The construction method according to claim 1, characterized in that, The force bearing beam is provided with prestressed tendons, which are arranged downwardly offset along the center line of the force bearing beam.

4. The construction method according to claim 1, characterized in that, The interval distance between the force bearing beams and the interval distance between the embedded grooves of the force bearing beams are the same as the length of the partition plate.

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