Tough mid-partition wall system based on automatic load conversion and construction method of tough mid-partition wall system

Abstract

The invention relates to a tough mid-partition wall system based on automatic load conversion and a construction method of the tough mid-partition wall system. The system comprises an upper steel structure, a middle convex part and a lower concave part from top to bottom. The upper steel structure is fixed on the segmental lining at the top; the top of the middle convex part is fixed to the bottom of the upper steel structure, and the bottom of the middle convex part is provided with an insertion column protruding downwards and a circular groove concaved upwards. The top of the lower concave part is provided with a downwards-concave inserting groove and an upwards-protruding tough spring device with a sleeve, the inserting column is downwards inserted into the inserting groove, and the tough spring device with the sleeve is upwards inserted into the circular groove. The vertical load borne by the partition wall can be automatically converted between the liquid bearing pressure and the spring bearing pressure of the tough spring device, and the concentrated load of the upper structure is effectively buffered, including the vertical pressure and the vertical tension. Meanwhile, as the spring is completely wrapped by liquid and isolated from air, the corrosion risk does not exist, and the durability of the tough mid-partition wall system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering construction, and in particular to a tough intermediate partition wall system based on automatic load conversion and a construction method thereof. Background Art

[0002] At present, as underground space develops towards greater depth and larger size, large-diameter shield tunnels are widely used in various transportation projects. The inner diameter of a large-diameter shield tunnel is generally 10m or more, and the internal space is relatively abundant. Therefore, the current large-diameter shield tunnels for transportation generally need to consider the transportation needs of two-way traffic. From the perspective of urban disaster prevention and evacuation (random evacuation), effective physical isolation must be carried out between the two-way traffic in the tunnel, that is, a double-line single-hole type, so the setting of a partition wall inside the tunnel is very necessary.

[0003] However, the current internal partition walls of large-diameter shield tunnels, whether they are mainly cast-in-place concrete structures or prefabricated structures, generally connect the partition walls to the upper structure rigidly, resulting in the partition walls in actual projects being too rigid and insufficiently tough. In the process of repeated changes in the vertical ellipticity of the shield tunnel, it is impossible to meet the overall safety and stability requirements of the partition walls and the underground structure, and it is also impossible to achieve a truly tough partition wall and a tough underground structure system. Although there have been engineering practices in which the partition walls and the upper structure are connected using buffer layers or ordinary springs, which can partially achieve the goal of not applying obvious additional loads to the partition walls when the upper structure settles and deforms, the underground structure will not only face downward settlement deformation during the 100-year operation period, but also upward uplift deformation (such as extrusion deformation). In this frequent reciprocating process, compressive stress and tensile stress may occur at the junction of the partition walls and the upper structure, and the currently used partition wall system cannot effectively cope with tensile stress. At the same time, the current intermediate wall system can only passively bear the additional vertical load that the underground structure may bear and transmit to the intermediate wall. If the load is too large or the action time is too concentrated, it may cause damage to the intermediate wall or the underground structure. Furthermore, the buffer layer or springs currently installed in the intermediate wall cannot solve the durability problem. The damage of the buffer layer and the rust of the spring are inevitable and thorny problems. In actual projects, timely maintenance or even replacement may be required, which cannot meet the century-long operation requirements of underground projects.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a tough middle partition wall system based on automatic load conversion and a construction method thereof, so as to solve the problems existing in the existing middle partition wall, such as being unable to effectively cope with tensile stress, being able to only passively bear vertical additional loads, and having poor durability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A tough middle partition wall system based on automatic load conversion, the system comprising, from top to bottom, an upper steel structure, a middle convex part and a lower concave part;

[0008] The upper steel structure is fixed to the top segment lining;

[0009] The top of the middle convex part is fixed to the bottom of the upper steel structure, and the bottom of the middle convex part has a downwardly protruding plug column and is provided with an upwardly concave circular groove;

[0010] The top of the lower concave part has a slot that is concave downwards and is provided with a sleeve-shaped flexible spring device that protrudes upwards, the plug column is inserted downwards into the slot, and the sleeve-shaped flexible spring device is inserted upwards into the circular groove;

[0011] The sleeve-type tough spring device includes a steel sleeve with a center hole on the top, a horizontal diaphragm is arranged inside the steel sleeve, and the diaphragm is divided into an upper compartment body and a lower compartment body, and a vertical pressure relief hole is arranged on the diaphragm; a vertical spring is arranged on the top of the diaphragm, and a top block inserted into the center hole is arranged on the top of the spring; the upper compartment body and the lower compartment body are filled with hydraulic oil, and a one-way connecting pipe with the conveying direction upward is arranged between the upper compartment body and the lower compartment body.

[0012] Furthermore, the circular grooves on the middle convex part are arranged in rows longitudinally, with a total of three rows, respectively located on the plug posts and the platforms on both sides;

[0013] Correspondingly, the sleeve-carrying flexible spring device of the lower concave part is also arranged in rows longitudinally, with three rows in total, which are respectively located on the slot and the steps on both sides.

[0014] Furthermore, the upper steel structure comprises an arc-shaped steel plate matching the segment lining, and the arc-shaped steel plate is fixed to the segment lining by anti-loosening bolts;

[0015] Two vertical steel clamping plates are fixed on the bottom surface of the arc-shaped steel plate. The two steel clamping plates are arranged longitudinally, and a horizontal steel bottom plate is fixed between them.

[0016] Furthermore, the upper portion of the middle convex member is inserted between the left and right steel clamping plates and fixed to the steel bottom plate by shear bolts.

[0017] Furthermore, a circular downward groove is provided on the lower concave part at the position where the sleeve-flexible spring device is provided, and the sleeve-flexible spring device is located in the circular downward groove.

[0018] Furthermore, the upper steel structure, the middle convex part and the lower concave part constitute a middle partition wall, and the middle partition wall is divided into multiple sections longitudinally, with a seam between two adjacent sections, and a flame-retardant EPDM sealing gasket is arranged in the seam, and the flame-retardant EPDM sealing gasket is fixed to the lower concave part by bolts.

[0019] Furthermore, an inclined plate is provided in the lower chamber of the steel sleeve, and a side of the inclined plate close to the liquid inlet of the one-way connecting pipe is lower than the other side.

[0020] Furthermore, a longitudinally arranged vertical steel partition is provided between the steel bottom plate and the arc-shaped steel plate, and oblique steel partitions are provided on both sides of the vertical steel partition.

[0021] Furthermore, transversely arranged steel ribs are provided on both sides of the steel clamping plate.

[0022] On the other hand, a method for constructing a tough intermediate partition wall system based on automatic load conversion is provided, the method comprising:

[0023] Use steel plates to make the upper steel structure;

[0024] Prefabricate the middle convex part, embed the shear bolts on the top and reserve a circular groove on the bottom;

[0025] Prefabricate the lower concave part, reserve a circular downward groove on the top, and reserve bolt holes on the end face perpendicular to its longitudinal direction;

[0026] After the shield tunnel and the segment lining are installed in place, the upper steel structure is fixed on the inner side of the top of the center position, the middle convex part is inserted upward into the upper steel structure, and the shear bolts on the top of the middle convex part are fixed to the steel bottom plate of the upper steel structure;

[0027] Place the sleeved flexible spring device into the circular downward groove, then move the lower concave part longitudinally to below the middle convex part, and at the same time push the sleeved flexible spring device into the circular groove;

[0028] The upper steel structure, the middle convex part and the lower concave part are installed in sections, with joints left longitudinally. Flame-retardant EPDM sealing gaskets are arranged in the joints and fixed to the bolt holes of the lower concave part by bolts.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a tough intermediate partition wall system based on automatic load conversion and a construction method thereof. As a reliable tough underground structure system, the vertical concentrated load can be automatically converted between liquid pressure and spring pressure, effectively buffering the concentrated load of the upper structure, including not only vertical pressure but also vertical tension; in addition, the spring is completely wrapped in liquid and isolated from the air, and there is no risk of corrosion, thus meeting the long-term durability requirements of the underground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a cross-sectional view of the connection between the upper steel structure and the segment lining in the present invention.

[0033] Figure 2 It is a cross-sectional view of the middle convex part in the present invention.

[0034] Figure 3 It is a cross-sectional view of the lower concave part of the present invention.

[0035] Figure 4 It is a cross-sectional view of the middle partition wall after installation in the present invention.

[0036] Figure 5 It is a side view (along the longitudinal direction of the tunnel) of the middle partition wall after installation in the present invention.

[0037] Figure 6 It is a top view of the upper surface of the lower concave part in the present invention.

[0038] Figure 7 It is a schematic diagram of the vertical load scale plate in the present invention.

[0039] Figure 8 It is a structural diagram of the flexible spring device with sleeve in the present invention.

[0040] The symbols in the figure are:

[0041] 1-segment lining, 2-epoxy gelling agent, 3-arc steel plate, 4-anti-loosening bolts, 5-steel ribs, 6-steel clamps, 7-steel bottom plate, 8-vertical steel diaphragms, 9-oblique steel diaphragms, 10-lower concave parts, 11-middle convex parts, 12-embedded circular steel plates, 13-tough spring devices with sleeves, 14-vertical load scale plates, 15-bolts, 16-joints;

[0042] 61-Steel plywood bottom line;

[0043] 101 - circular downward groove, 102 - top boundary line of the lower concave part;

[0044] 111-circular groove, 112-top boundary line of the middle convex part, 113-shear bolt;

[0045] 131-top block, 132-hydraulic oil, 133-steel sleeve, 134-diaphragm, 135-one-way connecting pipe, 136-pressure relief hole, 137-hydraulic oil level, 138-spring, 139-inclined plate;

[0046] 141-F0 scale line, 142-F1 scale line, 143-F2 scale line, 144-F3 scale line, 145-F4 scale line. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0048] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and it should not be understood as a limitation on the order of steps.

[0051] In a specific implementation manner, the area close to the inside of the tunnel (underground structure) is defined as "inside", the area close to the surrounding rock is defined as "outside", the length direction of the tunnel is defined as "longitudinal", and the cross-sectional direction of the tunnel is defined as "transverse".

[0052] When the existing tunnel partition wall is connected to the upper structure, a buffer layer or ordinary spring can be used. Although it can adapt to deformation, it is not tough enough and can only cope with compressive stress, but cannot effectively cope with tensile stress. The present invention provides a tough partition wall system based on automatic load conversion. By improving the components and their connection methods, the partition wall is given the ability to cope with tensile stress, allowing the structure to actively bear the vertical additional load and improve the structural durability.

[0053] Specifically, the system includes an upper steel structure, a middle convex member 11 and a lower concave member 10, which are spliced ​​from top to bottom to form a middle partition wall.

[0054] like Figure 1 , the upper steel structure is fixed to the top segment lining 1. The segment lining 1 belongs to the existing structure lining, mainly for underground tunnel engineering and reconstruction of underground space. The upper steel structure includes an arc-shaped steel plate 3 that matches the segment lining 1, and the arc-shaped steel plate 3 is fixed to the segment lining 1 by anti-loosening bolts 4. Two vertical steel clamps 6 are welded and fixed below the arc-shaped steel plate 3. The two steel clamps 6 are arranged along the longitudinal direction of the tunnel and a horizontal steel bottom plate 7 is fixed between them. In addition, a vertical steel partition 8 arranged longitudinally is arranged between the steel bottom plate 7 and the arc-shaped steel plate 3, and oblique steel partitions 9 are arranged on both sides of the vertical steel partition 8. The tops of the steel partitions are welded to the arc-shaped steel plate 3. Transversely arranged steel ribs 5 are also arranged on both sides of the steel clamp 6. The steel ribs 5 are arranged transversely along the tunnel, and the curvature of their bottoms matches the arc-shaped steel plate 3 and are welded and fixed. Various types of steel plates together constitute a special steel structure formed by three sides. The longitudinal lengths of the steel clamping plate 6, steel bottom plate 7, vertical steel partition 8 and oblique steel partition 9 match the size of the partition wall to be set in the existing underground structure, and the steel ribs 5 are spaced in the longitudinal direction. In the cross-sectional direction of the underground structure or tunnel, the total width of the arc steel plate 3 should exceed the sum of the transverse dimensions of the steel ribs 5 and the steel bottom plate 7. The total vertical height of the steel ribs 5 and the steel clamping plate 6 is equal, and must exceed the interface of the middle convex part 11 and the lower concave part 10 by 500mm or more.

[0055] Along the longitudinal direction of the underground structure, within the ring width of the shield tunnel segment lining 1, the arcuate steel plate 3 is anchored to the inner surface of the segment lining 1 by at least 4 rows of anti-loosening bolts 4, and the bottom of the steel ribs 5 spaced apart on the side of the steel clamp plate 6 reaches the bottom line 61 of the steel clamp plate. There are two component dividing lines (solid lines) above the bottom line 61 of the steel clamp plate, which are the top boundary line 112 of the middle convex part and the top boundary line 102 of the lower concave part.

[0056] In addition, epoxy gelling agent 2 is applied between the curved steel plate 3 and the segment lining 1 to improve the stability of the mutual connection.

[0057] The middle convex part 11 is a prefabricated reinforced concrete component, and the top is fixed to the bottom of the upper steel structure. Specifically, the upper part of the middle convex part 11 is inserted between the two steel clamps 6, and fixed to the steel bottom plate 7 by shear bolts 113. Bolt holes are reserved on the steel bottom plate 7. After the middle convex part 11 is lifted into place, the shear bolts 113 are tightened and fixed with anti-loosening washers and nuts. The number of shear bolts 113 set on the cross section is generally not less than 5, and the longitudinal number can be flexibly set according to needs, but the longitudinal spacing is generally not more than 750mm. Figure 2 The bottom of the middle convex part 11 has a downwardly protruding plug and is provided with an upwardly concave circular groove 111. A pre-buried circular steel plate 12 is provided in the circular groove 111. The downwardly protruding height of the plug is generally not less than 500 mm.

[0058] like Figure 3 The lower concave part 10 is a reinforced concrete prefabricated component, with a downwardly concave slot on the top and an upwardly protruding sleeve flexible spring device 13. A circular downward groove 101 is provided at the position where the sleeve flexible spring device 13 is provided on the lower concave part 10, and the sleeve flexible spring device 13 is located in the circular downward groove 101. A pre-buried circular steel plate 12 is provided in the circular downward groove 101. Figure 4 The lower concave part 10 is located below the middle convex part 11, the plug is correspondingly inserted into the slot, and the sleeve-shaped flexible spring device 13 is correspondingly inserted into the circular groove 111. Among them, the concave height of the circular downward groove 101 is generally about 1-2 cm, ensuring that the bottom of the sleeve-shaped flexible spring device 13 can be effectively embedded.

[0059] The present invention provides a sleeve-type flexible spring device 13 in the middle partition wall system, which can realize automatic load conversion and endow the middle partition wall with the ability to cope with both compressive stress and tensile stress at the same time. Figure 8The sleeve-type flexible spring device 13 comprises a steel sleeve 133 with a center hole at the top. A horizontal diaphragm 134 is arranged inside the steel sleeve 133 to divide the diaphragm 134 into an upper chamber and a lower chamber. A vertical pressure relief hole 136 is arranged on the diaphragm 134. A vertical spring 138 is arranged on the top of the diaphragm 134. A top block 131 inserted into the center hole of the steel sleeve 133 is arranged on the top of the spring 138. The upper chamber is completely filled with hydraulic oil 132, and the lower chamber is partially filled with hydraulic oil 132. A one-way connecting pipe 135 is arranged between the upper chamber and the lower chamber and is located in the range of the sleeve side wall. Under any working condition, the hydraulic oil level 137 can completely submerge the liquid inlet position at the bottom of the one-way connecting pipe 135. One-way valves are arranged at both ends of the one-way connecting pipe 135, so that only the bottom can enter and only the top can exit, so as to realize the one-way upward transportation function of the liquid. An inclined plate 139 is provided in the lower compartment of the steel sleeve 133 , and the side of the inclined plate 139 close to the liquid inlet of the one-way connecting pipe 135 is lower than the other side. At the same time, the hydraulic oil level 137 in the lower compartment is always located above the liquid inlet of the one-way connecting pipe 135 .

[0060] A vertical load scale plate 14 is also provided on the side of the lower concave member 10, which can quickly determine the vertical load transmitted between the middle partition wall and the underground structure. Specifically, the vertical load scale plate 14 is provided at the middle upper position of the side of the lower concave member 10, and its outer surface is flush with the surface of the lower concave member 10, and the top position is close to the boundary line 102 between the lower concave member 10 and the middle convex member 11. The specific position is determined by the design through calculation, and is specifically determined by the load scale line at the intersection of the bottom of the steel clamping plate 6 and the vertical load scale plate 14 after the middle partition wall is installed in place. At this time, the corresponding load is also the sum of the supporting forces of the six sleeve spring devices 13 within the range of a ring of segment lining 1. The vertical load scale plate 14 must be prefabricated together with the lower concave part 10, so it is made of steel sheet, and four typical numerical areas are engraved on its surface, corresponding to five scale lines: F0 (corresponding to the uncompressed state of the spring), F1 (corresponding to the 1 / 4 compressed state of the spring), F2 (corresponding to the 1 / 2 compressed state of the spring), F3 (corresponding to the 3 / 4 compressed state of the spring), and F4 (corresponding to the maximum compressed state of the spring). Among them, the F0 scale line corresponds to the uncompressed state of the spring under the natural state, and the F4 scale line corresponds to the maximum compressed state. At the same time, each numerical area is divided into four equal parts. According to the intersection position of the bottom of the steel clamp 6 and the scale plate 14, the corresponding total supporting force of the spring device 13 can be quickly read out.

[0061] The circular groove 111 on the middle convex part 11 and the circular downward groove 101 of the lower concave part 10 must be strictly aligned in position, diameter and number. At the same time, the sum of the heights of the upper and lower grooves should match the height of the sleeve-shaped flexible spring device 13, which is generally 1 / 2 to 1 / 3 of the corresponding height of the spring in the uncompressed natural state. At the same time, it should be ensured that the sleeve-shaped flexible spring device 13 is in the maximum compressed state, and the contact surface gap between the middle convex part 11 and the lower concave part 10 is not less than 5cm. The height of the concave slot in the middle of the lower concave part 10 is generally not less than 500mm, which matches the size of the convex plug column in the middle of the middle convex part 11. At the same time, the cross-sectional shape and size of the two must be strictly corresponding. In some embodiments, the circular groove 111 on the middle convex part 11 is arranged in three rows horizontally, respectively located on the plug column and the platforms on both sides. Correspondingly, the sleeve-shaped flexible spring device 13 of the lower concave part 10 is also arranged in three rows horizontally, respectively located in the slot and the steps on both sides. The longitudinal number of circular grooves 111 and sleeve-shaped flexible spring devices 13 can be flexibly set according to needs, but at least two groups are set within the ring width range of each segment lining 1 of the shield tunnel, and are symmetrically arranged along the ring width center of the segment lining 1.

[0062] Looking from top to bottom at the middle partition wall, the width of the steel bottom plate 7 is consistent with the width of the middle convex part 11 and the lower concave part 10, and the length of the longitudinal section is consistent with the ring width of the segment lining 1. The top of the steel rib plate 5 presents a certain curvature feature, which is consistent with the curvature of the segment lining 1 and the curved steel plate 3. There are two oblique steel plates 9 on the left and right and a vertical steel partition 8 above the steel bottom plate 7, and the top of the vertical steel partition 8 is welded to the curved steel plate 3. Under the premise of mechanical anchoring of the curved steel plate 3 and the segment lining 1, the upper steel structure forms a composite component with extremely high horizontal rigidity.

[0063] The upper steel structure, the middle convex part 11 and the lower concave part 10 form a middle partition wall, which is divided into sections to a certain extent along the longitudinal direction of the tunnel. The length of the sections can be consistent with the ring width of the segment lining 1. There is a joint 16 between two adjacent sections. A flame-retardant EPDM gasket is arranged in the joint 16. The flame-retardant EPDM gasket is fixed to the lower concave part 10 by bolts. The length of the joint 16 along the longitudinal direction of the tunnel is generally not less than 15 cm. The top of the flame-retardant EPDM gasket is flush with the inner surface of the segment lining 1, that is, the upper steel structure, the middle convex part 11 and the lower concave part 10 are all disconnected by the joint 16. The cross-sectional width of the joint 16 is consistent with the width of the middle partition wall, and the sum of its length and the length of each middle partition wall is equal to the ring width of the segment lining 1.

[0064] After the middle partition wall is installed, in order to ensure the vertical and horizontal stability of the middle partition wall, the sleeve-type tough spring device 13 should be in an effective compression state, so that the top of the middle partition wall is in a controllable micro-pressure state. At this time, the compression amount of the spring can be considered to be slightly greater than the spring compression deformation caused by the sum of the deadweight of the middle convex part 11 and the upper steel structure.

[0065] The above-mentioned resilient middle partition wall system based on automatic load conversion realizes the resilient compression and stretching of the middle partition wall with the help of the elastic force provided by the sleeve resilient spring device 13, and can observe the vertical load transmitted between the middle partition wall and the existing structure in real time, which not only ensures that the middle partition wall has a certain overall stability, but also achieves the effect that the load transmitted between the existing structure and the middle partition wall can be automatically and slowly transmitted.

[0066] The method for constructing the above-mentioned flexible intermediate partition wall system based on automatic load conversion specifically includes the following steps:

[0067] S1: Use steel plates to make the upper steel structure.

[0068] Various types of steel plates corresponding to the upper steel structure are produced:

[0069] (1) According to the curvature of the inner surface of the underground structure segment lining 1 and the ring width (generally 1.5m, 1.8m or 2.0m can be considered), the curved steel plate 3 is manufactured, and holes for the anti-loosening bolts 4 to pass through are reserved at the corresponding positions. The holes should be located in the middle of the adjacent steel ribs 5 along the longitudinal direction of the tunnel;

[0070] (2) According to the ring width of the segment lining 1, the steel ribs 5, steel clamps 6, steel bottom plates 7 and steel partitions are manufactured. The length of the widest side of the steel ribs 5 is generally not less than 0.5 times the width of the middle partition wall, and the length of the narrowest side of the steel ribs 5 is generally not less than 0.25 times the width of the middle partition wall.

[0071] The thickness of each type of steel plate should not be less than 5mm. The width of the middle partition wall can generally be considered as 400-500mm.

[0072] Except for the arc-shaped steel plate 3, the other types of steel plates are welded in the factory using double-sided welding to form a special steel structure surrounded on three sides.

[0073] S2: Prefabricate the middle convex part 11, embed the shear bolt 113 on the top, and reserve a circular groove 111 on the bottom.

[0074] S3: Prefabricate the lower concave part 10, reserve a circular downward groove 101 on its top, and reserve bolt holes on its side, so that when the EPDM sealing strip is installed in the end joint 16 on one side of the middle partition wall, it can be mechanically fixed with bolts 15.

[0075] According to the design requirements and the load range that the sleeve ductile spring device 13 may bear, the vertical load scale plate 14 is made in advance, using a steel plate with a thickness of about 2 mm, and the load scale is divided into four equal parts on its surface. Specifically, a steel plate with a thickness of about 2 mm is cut into a rectangle, the surface is polished flat, and one side of it is calibrated with scale lines. Before calibration, the design should provide specific scale line division requirements. First, according to the requirements of four equal divisions, the five scale lines including the upper and lower edges are calibrated, and marked on one side of the scale lines from top to bottom: F0, F1, F2, F3, F4, and then between the upper and lower adjacent scale lines, three scale lines are engraved again according to the principle of four equal divisions, and then the production of the vertical load scale plate is completed.

[0076] S4: After the segment lining 1 is installed in place, fix the upper steel structure on the inner side of its top, apply lubricating oil two to three times on the inner side of the steel clamp plate 6, insert the middle convex part 11 upward into the upper steel structure, and fix the shear bolts 113 on the top of the middle convex part 11 to the upper steel structure, then slowly insert the lower concave part 10 under the middle convex part 10 to complete the assembly of the middle partition wall.

[0077] According to the design requirements, after the segment lining 1 is installed in place, the arc steel plate 3 is first fixed to the corresponding position of the segment lining 1 with epoxy gelling agent 2 and anti-loosening bolts 4; then, the upper steel structure and the middle convex part 11 are effectively fixed by passing the shear bolts 113 through the steel bottom plate 7 and using anti-loosening washers and nuts, and then the upper steel structure and the middle convex part 11 are lifted upward as a whole, and the contact part with the arc steel plate 3 is fully and effectively connected through a double-sided welding process; finally, the upper surface of the lower concave part 10 is reserved. The position is placed in the sleeve toughness spring device 13, at which time the spring compression is generally in a state of 50-25% of the maximum compression, and it is slowly inserted into the middle convex part 11 below the longitudinal direction of the underground structure. After the middle convex part 11 and the lower concave part 10 are completely aligned up and down, the spring reaction force is released to ensure that the middle partition wall is in a slightly compressed state as a whole, and at the same time, the lower concave part 10 is mechanically anchored to the shield tunnel lining structure with high-performance bolts.

[0078] S5: Place the sleeve-carrying resilient spring device 13 into the circular downward groove 101, and then slowly insert the lower concave member 10 into the middle convex member 11 along the longitudinal direction of the tunnel, so that the sleeve-carrying resilient spring device 13 enters the circular groove 111;

[0079] S6: The upper steel structure, the middle convex part 11 and the lower concave part 10 are installed in sections, leaving a joint 16 in the longitudinal direction, and a flame-retardant EPDM sealing gasket is arranged in the joint and fixed to the bolt hole of the lower concave part 10 by bolts.

[0080] The resilient intermediate partition wall system based on automatic load conversion proposed in the present invention divides the steel sleeve 133 into an upper warehouse body and a lower warehouse body through a transverse partition 134. The top of the steel sleeve 133 is open and a top block 131 (connected to the top of the spring) is arranged. The top block 131 is effectively sealed with the steel sleeve 133 on all sides and can meet the vertical free lifting and lowering requirements of the top block. A high-performance spring 138 and an inert hydraulic oil 132 are arranged in the upper warehouse body, and the upper warehouse body meets the air tightness requirements. A certain number of pressure relief holes 136 are arranged on the transverse partition 134 at the bottom of the upper warehouse. The hydraulic oil 132 in the upper warehouse body can flow from the pressure relief holes 136 into the lower warehouse body under a certain external pressure, but cannot pass through the pressure relief holes 136 under the gravity of the hydraulic oil 132. At the same time, a one-way valve is arranged inside the pressure relief hole 136 to prevent the gas in the lower warehouse body from entering the upper warehouse body.

[0081] An inclined plate 139 is provided inside the lower warehouse body to allow the hydraulic oil 132 to continuously flow to a lower place. On the left side of the steel sleeve 133, a one-way connecting pipe 135 is provided from the lowest point of the inclined plate 139 to the bottom of the top plate of the upper warehouse body. One-way valves are provided at both ends of the one-way connecting pipe 135 to only allow the hydraulic oil 132 to enter from the lower warehouse body and exit from the upper warehouse body. The one-way connecting pipe 135 is embedded in the side wall of the steel sleeve 133. In the lower warehouse body, a small hole (one-way, only allowing entry but not exit) is reserved on the right side wall of the steel sleeve 133 below the diaphragm 134 to ensure that the air pressure inside the lower warehouse body is basically consistent with that outside.

[0082] Under natural conditions, a certain volume of hydraulic oil 132 (the same as the hydraulic oil 132 in the upper bin body) is placed in the lower bin body, and the space in the upper bin body is filled with the hydraulic oil 132. The spring 138 in the upper bin body is always surrounded by the hydraulic oil 132, ensuring that the spring 138 is always in a sealed state, avoiding the risk of rust.

[0083] The working process of the present invention is specifically as follows:

[0084] (1) The top block 131 is subjected to the vertical load from the top, and moves downward. The instantaneous vertical load transmitted from the top block 131 is mainly borne by the upper tank body hydraulic oil 132 (liquid is incompressible). As time goes on, the upper tank body hydraulic oil 132 gradually flows into the lower tank body from the pressure relief hole 136 of the diaphragm 134, and the spring 138 is compressed accordingly. The vertical load will be slowly transferred from the upper tank body hydraulic oil 132 to the spring 138. When the spring 138 bears all the vertical loads, the upper tank body hydraulic oil 132 no longer bears the vertical load, and the pressure relief hole 136 on the diaphragm 134 is automatically closed;

[0085] (2) When the upper load decreases, the top block 131 moves upward, and the spring 138 is stretched accordingly. A certain negative pressure area (a cavity with a certain vacuum degree) will be formed around the top block 131 and the upper area of ​​the upper warehouse body. At this time, the hydraulic oil 132 in the lower warehouse body below the diaphragm 134 is automatically pumped to the cavity area of ​​the upper warehouse body through the one-way connecting pipe 135, and the upper warehouse body immediately returns to a full warehouse hydraulic oil state.

[0086] The core of the above-mentioned vertical elastic middle partition wall construction process and construction method is based on the vertical elastic expansion and contraction function of the sleeve toughness spring device 13. On the one hand, it can ensure that the contact part between the top of the middle partition wall and the underground structure (such as the shield tunnel segment lining 1) is always in the elastic deformation range. On the other hand, it can ensure that no tensile stress occurs at the connection part between the top of the middle partition wall and the underground structure in the later vertical extrusion deformation stage of the shield tunnel. Whether the shield tunnel is in lateral convergence deformation or vertical extrusion deformation, the elastic middle partition wall can always maintain horizontal and vertical stability, and will not impose excessive additional load on the top underground structure.

[0087] The steel clamping plate 6 and the steel rib plate 5 have the same vertical height, and their bottoms should exceed the top boundary line 102 of the lower concave member by at least 500 mm (when the spring is in the minimum compression state); for ease of implementation, the height of the upper steel structure should generally be controlled at around 300 mm, the height of the middle convex member 11 should generally be controlled at around 200-300 mm, and the overall height of the lower concave member 10 is controlled by the overall height of the middle partition wall.

[0088] Along the longitudinal direction of the shield tunnel, the ring width of the segment lining 1 can generally be considered as 1500mm, 1800mm or 2000mm, and the production of all components of the middle partition wall is based on the ring width of the segment; a joint with a length of about 15cm is set at the end of the middle partition wall, and the flame-retardant EPDM sealing gasket is filled in the joint, and it is fixed to the lower concave part 10 by bolts 15.

[0089] According to the design, after the lower concave part 10 is inserted into the middle convex part 11 along the longitudinal direction of the tunnel, the vertical elastic force of the spring device 13 is released. At this time, the bottom of the steel clamp plate 6 should be located between the F1 scale line 142 and the F2 scale line 143, leaving at least 200 mm of change space for the vertical convergence and extrusion deformation of the shield tunnel in the later stage.

[0090] In the above structure, the arc steel plate 3, steel rib plate 5, steel clamping plate 6, steel bottom plate 7, vertical steel partition plate 8, inclined steel partition plate 9, and vertical load scale plate 14 can all be made of Q235 steel, the segment lining 1, the middle convex part 11 and the lower concave part 10 are all made of reinforced concrete, the anti-loosening bolts 4, shear bolts 13, bolts 15, etc. are all made of 8.8 grade or above bolts, and the EPDM sealing gasket filled in the joint 16 must have good flame retardant ability.

[0091] The method provided by the present invention should be noted during implementation:

[0092] 1. The width of the steel bottom plate 7 at the middle bottom of the upper steel structure is the horizontal clearance between the left and right steel clamps 6, which is slightly larger than the width of the middle partition wall, generally about 5mm. The width of the middle partition wall is the width of the middle convex part 11 and the lower concave part 10, which can generally be considered to be about 400mm. At the same time, before the upper steel structure is nested above the middle convex part 11, it is necessary to apply at least two to three layers of lubricating oil on the inner side of the steel clamp 6;

[0093] 2. The middle convex part 11 and the lower concave part 10 are mainly connected by a concave-convex tenon-groove, the tenon-groove height is generally not less than 300 mm, and the same arrangement is made along the longitudinal direction of the shield tunnel or underground structure;

[0094] 3. After the middle partition wall is installed in place, the top boundary line 102 of the lower concave member 10 should be at least 500mm above the bottom of the steel clamping plate 6, which is conducive to ensuring the overall stability of the middle partition wall under the action of lateral load;

[0095] 4. The upper steel structure is mainly fixed by double-sided welding with the arc-shaped steel plate 3, and the arc-shaped steel plate 3 is fixedly connected to the segment lining 1 by anti-loosening bolts 4. The number of anti-loosening bolts 4 arranged on the cross section should generally not be less than 4, two of which are located in the projection range of the steel bottom plate 7, and two are located in the projection range of the steel rib plate 5; at the same time, along the longitudinal direction of the shield tunnel or underground structure, the anti-loosening bolts 4 are all located in the middle of the front and rear adjacent steel rib plates 5;

[0096] 5. The connection between the middle convex part 11 and the upper steel structure is mainly fixed by shear bolts 113. The number of shear bolts 113 on the cross section should not be less than 6, and the longitudinal arrangement along the shield tunnel or underground structure is generally consistent with the anti-loosening bolts 4;

[0097] 6. The number of the sleeve spring device 13 provided on the contact surface between the lower concave part 10 and the middle convex part 11 should not be less than 2 groups along the ring width of the shield tunnel segment lining 1, 3 in a group on the cross section, and symmetrically distributed along the middle part of the segment lining 1, and the distance from the end of each ring of the segment lining 1 should be not less than 500mm;

[0098] 7. After the middle partition wall is installed in place, the bottom of the steel clamp plate 6 should be located between the F1 scale line 142 and the F2 scale line 143, leaving at least 200 mm of change space for the vertical convergence and extrusion deformation of the shield tunnel in the later stage.

[0099] The structure of the present invention has the following characteristics and advantages:

[0100] 1) Based on the principle of "elastic connection and full assembly", the present invention constructs a middle partition wall that can be elastically expanded and contracted within a certain height range, thereby converting the rigid connection between the middle partition wall inside the large-diameter shield tunnel and the shield tunnel segment lining into an elastic connection, which can not only effectively cope with the later settlement deformation or horizontal convergence deformation of the shield tunnel, but also effectively cope with the extrusion deformation or tensile deformation caused by later changes in the internal and external environment;

[0101] 2) The vertical support force of the "tough" intermediate partition wall of the present invention is mainly achieved by a spring device with a sleeve. The length of each intermediate partition wall along the longitudinal direction of the shield tunnel or underground structure is the same as the ring width of the segment lining, and a vertical load scale plate is set in the middle of the intermediate partition wall. The vertical load borne by the corresponding intermediate partition wall at this time can be easily read according to the intersection line between the bottom of the steel clamping plate and the scale plate, so as to avoid the intermediate partition wall from applying excessive internal load to the segment lining of the shield tunnel;

[0102] 3) The fully assembled tough middle partition wall system inside the shield tunnel or underground structure constructed by the present invention meets the requirements of fast and safe operation on site, and can realize assembly line operation, greatly improving the efficiency on site, and conforming to the green and low-carbon industry development trend. The scheme has clear ideas, simple processes, and simple construction, with high economic and social benefits, and has broad application prospects in internal structure operations involved in urban underground space development, rail transit, railway projects, etc.

[0103] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. The toughness partition wall system based on automatic load conversion is characterized by: The system comprises, from top to bottom, an upper steel structure, a middle convex part (11) and a lower concave part (10); The upper steel structure is fixed to the top segment lining (1); The top of the middle convex part (11) is fixed to the bottom of the upper steel structure, and the bottom of the middle convex part (11) has a downwardly protruding plug column and is provided with an upwardly concave circular groove (111); The top of the lower concave member (10) has a slot that is concave downwards and is provided with a sleeve-shaped flexible spring device (13) that protrudes upwards, the plug post is inserted downwards into the slot, and the sleeve-shaped flexible spring device (13) is inserted upwards into the circular groove (111); The sleeve-type flexible spring device (13) comprises a steel sleeve (133) with a center hole at the top, a horizontal diaphragm (134) is arranged inside the steel sleeve (133), and the diaphragm (134) is divided into an upper storage body and a lower storage body, and a vertical pressure relief hole (136) is arranged on the diaphragm (134); a vertical spring (138) is arranged on the top of the diaphragm (134), and a top block (131) inserted into the center hole is arranged on the top of the spring (138); the upper storage body and the lower storage body are filled with hydraulic oil (132), and a one-way connecting pipe (135) with the conveying direction upward is arranged between the upper storage body and the lower storage body.

2. The flexible intermediate partition wall system based on automatic load conversion according to claim 1 is characterized in that: The circular grooves (111) on the middle convex part (11) are arranged in rows longitudinally, with a total of three rows, respectively located on the plug posts and the platforms on both sides; Correspondingly, the sleeve-carrying flexible spring device (13) of the lower concave member (10) is also arranged in rows longitudinally, with a total of three rows, respectively located on the slot and the steps on both sides.

3. The flexible intermediate partition wall system based on automatic load conversion according to claim 2 is characterized in that: The upper steel structure comprises an arc-shaped steel plate (3) matching the segment lining (1), and the arc-shaped steel plate (3) is fixed to the segment lining (1) by anti-loosening bolts (4); Two vertical steel clamping plates (6) are fixed on the bottom surface of the arc-shaped steel plate (3); the two steel clamping plates (6) are arranged longitudinally, and a horizontal steel bottom plate (7) is fixed between them.

4. The flexible intermediate partition wall system based on automatic load conversion according to claim 3 is characterized in that: The upper portion of the middle convex member (11) is inserted between the two left and right steel clamping plates (6) and is fixed to the steel bottom plate (7) via shear bolts (113).

5. The flexible intermediate partition wall system based on automatic load conversion according to claim 4 is characterized in that: A circular downward groove (101) is provided at the position on the lower concave part (10) where the sleeve-flexible spring device (13) is provided, and the sleeve-flexible spring device (13) is located in the circular downward groove (101).

6. The flexible intermediate partition wall system based on automatic load conversion according to claim 5 is characterized in that: The upper steel structure, the middle convex part (11) and the lower concave part (10) form a middle partition wall, and the middle partition wall is divided into multiple sections in the longitudinal direction, and there is a joint (16) between two adjacent sections. A flame-retardant EPDM sealing gasket is arranged in the joint (16), and the flame-retardant EPDM sealing gasket is fixed to the lower concave part (10) by bolts.

7. The flexible intermediate partition wall system based on automatic load conversion according to claim 6 is characterized in that: An inclined plate (139) is provided in the lower chamber of the steel sleeve (133), and the side of the inclined plate (139) close to the liquid inlet of the one-way connecting pipe (135) is lower than the other side.

8. The flexible intermediate partition wall system based on automatic load conversion according to claim 7 is characterized in that: A longitudinally arranged vertical steel partition (8) is provided between the steel bottom plate (7) and the arc-shaped steel plate (3), and oblique steel partitions (9) are provided on both sides of the vertical steel partition (8).

9. The flexible intermediate partition wall system based on automatic load conversion according to claim 8 is characterized in that: Transversely arranged steel ribs (5) are provided on both sides of the steel clamping plate (6).

10. A method for constructing a tough intermediate partition wall system based on automatic load conversion, characterized in that: The method comprises: Use steel plates to make the upper steel structure; A prefabricated middle convex part (11) is provided with a shear bolt (113) embedded in the top and a circular groove (111) reserved in the bottom; A prefabricated lower concave member (10) is provided with a circular downward groove (101) at the top thereof and a bolt hole is provided at the end face perpendicular to the longitudinal direction thereof; After the shield tunnel and the segment lining (1) are installed in place, the upper steel structure is fixed on the inner side of the top of the center position, the middle convex part (11) is inserted upward into the upper steel structure, and the shear bolts (113) at the top of the middle convex part (11) are fixed to the steel bottom plate (7) of the upper steel structure; Place the sleeve-mounted flexible spring device (13) into the circular downward groove (101), then move the lower concave member (10) longitudinally to below the middle convex member (11), and simultaneously push the sleeve-mounted flexible spring device (13) into the circular groove (111); The upper steel structure, the middle convex part (11) and the lower concave part (10) are installed in sections, with a joint (16) left longitudinally, and a flame-retardant EPDM sealing gasket is arranged in the joint and fixed to the bolt hole of the lower concave part (10) by bolts.

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