TBM starting reaction frame structure under weak surrounding rock and large longitudinal slope conditions

Abstract

The utility model discloses a TBM (Tunnel Boring Machine) starting reaction frame structure under weak surrounding rock and large longitudinal slope conditions. The TBM starting reaction frame structure comprises a reaction frame bottom beam, a left reaction frame connecting beam, a left reaction frame lower beam, a right reaction frame lower beam, a right reaction frame connecting beam, a left reaction frame side beam, a left reaction frame upper side beam, a reaction frame top beam, a right reaction frame upper side beam and a right reaction frame side beam, the left reaction frame side beam and the right reaction frame side beam are respectively arranged on the reaction frame bottom beam, the left end and the right end of the left reaction frame connecting beam are respectively fixed on the left reaction frame side beam and the reaction frame bottom beam, and the left end and the right end of the right reaction frame connecting beam are respectively fixed on the reaction frame bottom beam and the right reaction frame side beam; the lower end of the left reaction frame upper side beam is connected with the upper end of the left reaction frame side beam, and the lower end of the right reaction frame upper side beam is connected with the upper end of the right reaction frame side beam. The problems that in the launching process of the TBM under the conditions of weak surrounding rock and a large longitudinal slope, the bearing capacity of the reaction steel frame is insufficient, the deformation of the reaction steel frame is large, and the deviation of the first ring duct piece easily exceeds the design specification are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of TBM originating counterforce frame structure under soft surrounding rock and large longitudinal slope condition, belong to TBM originating technical field. BACKGROUND

[0002] TBM exists in the process of originating in soft surrounding rock geology section, its rock wall cannot provide enough counterforce for shield body supporting shoe, if originating in uphill section, shield body gravity component further makes TBM difficult to advance smoothly;To ensure the stability of surrounding rock in the initial stage of TBM originating, relevant protective measures make the section of originating hole further reduce;If TBM is in upper longitudinal slope section, let supporting shoe and rear support leg be restricted to make its posture more difficult to adjust, easily cause counterforce frame deformation, lead to the horizontal and vertical deviation that appears in the process of first ring segment assembly exceeding tunnel design specification.

[0003] To solve the above problems, TBM usually adopts counterforce frame structure to provide enough supporting force for shield body during originating process, to ensure the smooth advancement of TBM during originating process.But if traditional counterforce frame structure is used under soft surrounding rock and large longitudinal slope condition, there will be the following three problems: 1, steel support structure deformation is further increased to cause safety risk due to insufficient supporting force provided by counterforce frame;2, the subsequent segment exists the risk of misalignment due to the excessive deviation of first ring segment;3, the section of originating hole is further reduced under soft surrounding rock and large longitudinal slope, and it will consume a lot of construction period to transport traditional counterforce frame components to site and assemble.

[0004] With the continuous popularization of TBM technology, subsequent tunnel construction will inevitably pass through soft surrounding rock and large longitudinal slope section, and the key technical problem is to improve the overall shear and bending performance of counterforce frame structure and provide enough supporting counterforce for TBM shield body and further reduce counterforce frame deformation, so as to control the horizontal and vertical deviation of first ring segment and ensure the smooth advancement of TBM during originating process. INVENTION CONTENTS

[0005] The utility model aims at the problems existing in the prior art, and provides a kind of TBM originating counterforce frame structure under soft surrounding rock and large longitudinal slope condition;The utility model aims at that the reaction force of oil cylinder thrust and the component of shield body gravity are evenly transmitted to counterforce frame supporting beam structure by the close adhesion of counterforce frame main girder and segment, using steel rod support, high-strength bolt and combined I-beam box girder, to increase the section moment of inertia of structure, support shear bending moment and shear bending deformation performance, to balance the counterforce in the process of originating and further reduce the deformation of counterforce frame structure, control the horizontal and vertical deviation of first ring segment by the action of locking steel plate positioning locking segment lining, to solve the problems of insufficient bearing capacity of counterforce steel frame, large deformation of counterforce steel frame and easy deviation of first ring segment exceeding design specification in the process of TBM originating under soft surrounding rock and large longitudinal slope condition.

[0006] The utility model provides a technical solution to solve the above technical problems: a TBM starting reaction frame structure under conditions of soft surrounding rock and large longitudinal slope, comprising a reaction frame bottom beam, a left reaction frame connecting beam, a left reaction frame lower beam, a right reaction frame lower beam, a right reaction frame connecting beam, a left reaction frame side beam, a left reaction frame upper side beam, a reaction frame top beam, a right reaction frame upper side beam, and a right reaction frame side beam;

[0007] The left reaction frame side beam and the right reaction frame side beam are respectively installed at the left and right ends of the reaction frame bottom beam, and the left reaction frame lower beam and the right reaction frame lower beam are respectively installed on the reaction frame bottom beam;

[0008] The left and right ends of the left reaction frame connecting beam are respectively fixed to the right side of the left reaction frame side beam and the reaction frame bottom beam, and the left and right ends of the right reaction frame connecting beam are respectively fixed to the left sides of the reaction frame bottom beam and the right reaction frame side beam;

[0009] The left reaction frame upper side beam, the reaction frame top beam, and the right reaction frame upper side beam are connected in sequence, wherein the lower end of the left reaction frame upper side beam is connected to the upper end of the left reaction frame side beam, and the lower end of the right reaction frame upper side beam is connected to the upper end of the right reaction frame side beam.

[0010] A further technical solution is that the reaction frame bottom beam, left reaction frame connecting beam, left reaction frame lower beam, right reaction frame lower beam, right reaction frame connecting beam, left reaction frame side beam, left reaction frame upper side beam, reaction frame top beam, right reaction frame upper side beam, and right reaction frame side beam are all connected by steel plates, and high-strength bolts are used to rivet the steel plates and each beam.

[0011] A further technical solution is that upper supporting steel beams are provided on the sides of the left reaction frame upper beam, the reaction frame top beam, and the right reaction frame upper beam.

[0012] A further technical solution is that the upper supporting steel beam is composed of two H300 steel sections and 20mmQ235 steel plates welded on both sides of the flange.

[0013] A further technical solution is that lower supporting steel beams are provided on the sides of the left reaction frame connecting beam, the left reaction frame lower beam, the right reaction frame lower beam, the right reaction frame connecting beam, the left reaction frame side beam and the right reaction frame side beam.

[0014] A further technical solution is that a steel rod support is provided at the lower end of the lower supporting steel beam.

[0015] A further technical solution is that the steel bar support includes a support steel plate and a plurality of fixed round steels extending into the rock mass, and the upper ends of the fixed round steels are fixed to the bottom surface of the support steel plate.

[0016] A further technical solution is that the lower supporting steel beam is a seamless steel pipe with a diameter of 300 mm and a wall thickness of 30 mm.

[0017] Further technical solutions are that the left counter-force frame side beam, the left counter-force frame upper side beam, the counter-force frame top beam, the right counter-force frame upper side beam and the right counter-force frame side beam are all provided with locking steel plates abutting against the surface of the pipe lining.

[0018] Further technical solutions are that the locking steel plates are welded with the counter-force frame to form an integral whole.

[0019] The utility model has the following beneficial effects:

[0020] 1. The combined box beams composed of two 45c I-shaped steel and 20mm Q235 steel plates welded on both sides of the flanges and riveted through M8.8Φ22 high-strength bolts between the main beams of each counter-force frame can increase the sectional moment of inertia of the main beam structure and further increase the bending and shearing resistance of the structure.

[0021] 2. The steel support composed of support steel plates and fixed round steel of the counter-force frame support beam can increase the bearing capacity of the support structure and further reduce the deformation of the counter-force frame structure.

[0022] 3. The locking steel plates connected with the main beams of the counter-force frame can further position and lock the first ring pipe segment and reduce the assembly deviation, and the reserved gap can prevent the pipe segment from being extruded by the TBM in the subsequent launching process to cause large deformation.

[0023] 4. The counter-force frame component product is low in price and can be processed off-site, which is beneficial to convenient transportation to the launching hole for assembly, reduction of the site area and shortening of the corresponding construction period. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a sectional view of the utility model;

[0025] Figure 2 It is an assembly schematic view of the main beam structure of the counter-force frame;

[0026] Figure 3 It is a sectional view of the lower beam of the right counter-force frame;

[0027] Figure 4 It is a sectional view of the connecting beam of the right counter-force frame;

[0028] Figure 5 It is a sectional view of the side beam of the right counter-force frame;

[0029] Figure 6 It is a sectional view of the top beam of the counter-force frame;

[0030] Figure 7 It is a schematic view of the steel support;

[0031] Figure 8 It is a sectional view of the upper support beam;

[0032] Figure 9 For the force frame main beam connecting plate to use the drawing;

[0033] Figure 10 For the engineering overview drawing.

[0034] As shown in the figure: 1 - the force frame bottom beam, 2 - the left force frame connecting beam, 3 - the left force frame lower beam, 4 - the right force frame lower beam, 5 - the right force frame connecting beam, 6 - the left force frame side beam, 7 - the left force frame upper side beam, 8 - the force frame top beam, 9 - the right force frame upper side beam, 10 - the right force frame side beam, 11 - the support steel plate, 12 - the fixed round steel, 13 - the locking steel plate, 14 - the upper support steel beam, 15 - the lower support steel beam, 16 - the welded steel plate, 17 - the 45c type I-beam, 18 - the H300 type steel, 19 - the steel plate, 20 - the high-strength bolt. DETAILED DESCRIPTION

[0035] The technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0039] For example, Figure 1As shown, the utility model provides a kind of soft weak surrounding rock and TBM originating counterforce frame structure under big longitudinal slope condition, including counterforce frame bottom beam 1, left counterforce frame connecting beam 2, left counterforce frame lower beam 3, right counterforce frame lower beam 4, right counterforce frame connecting beam 5, left counterforce frame side beam 6, left counterforce frame upper side beam 7, counterforce frame top beam 8, right counterforce frame upper side beam 9, right counterforce frame side beam 10;

[0040] Left counterforce frame side beam 6, right counterforce frame side beam 10 are respectively installed in the left and right ends of counterforce frame bottom beam 1, left counterforce frame lower beam 3, right counterforce frame lower beam 4 are respectively installed on the two sides of the middle of counterforce frame bottom beam 1;

[0041] The left and right ends of left counterforce frame connecting beam 2 are fixed on the right side of left counterforce frame side beam 6 and counterforce frame bottom beam 1 respectively, and the left and right ends of right counterforce frame connecting beam 5 are fixed on the left side of counterforce frame bottom beam 1 and right counterforce frame side beam 10 respectively;

[0042] Left counterforce frame upper side beam 7, counterforce frame top beam 8 and right counterforce frame upper side beam 9 are connected in sequence, wherein the lower end of left counterforce frame upper side beam 7 is connected with the upper end of left counterforce frame side beam 6, and the lower end of right counterforce frame upper side beam 9 is connected with the upper end of right counterforce frame side beam 10.

[0043] As shown in the figure, Figure 2 Each of the above beams is composed of two 45c I-beams 17 and 20mm Q235 steel plates 16 welded on the flanges. The center line of the counterforce frame structure coincides with the originating center line, and the center deviation of each component of the counterforce frame should not exceed 2mm.

[0044] Each of the above beams is connected by a steel plate 19 (600×600×20mm Q235), and the steel plate 19 and each beam are connected by M8.8Φ22 high-strength bolts 20. The welding quality of each component of the counterforce frame structure should reach the welding quality standard of grade II and above.

[0045] As shown in the figure, Figure 1 And Figure 6 , Figure 10 The side surfaces of left counterforce frame upper side beam 7, counterforce frame top beam 8 and right counterforce frame upper side beam 9 are provided with upper support steel beams 14, wherein one end of the upper support steel beam 14 is fixed on the side surface of the beam, and the other end is fixed on the lining surface of the non-TBM section.

[0046] As shown in the figure, Figure 8 The upper support steel beam 14 is composed of two H300 steels 18 and 20mm Q235 steel plates welded on the flanges. The upper support beam 14 should avoid extruding and damaging the waterproof material of the support surface during installation.

[0047] As shown in the figure, Figure 1 , Figure 3、 Figure 4 、 Figure 5 、 Figure 10 As shown, the sides of the left reaction frame connecting beam 2, the left reaction frame lower beam 3, the right reaction frame lower beam 4, the right reaction frame connecting beam 5, the left reaction frame side beam 6, and the right reaction frame side beam 10 are all provided with lower supporting steel beams 15, and the upper ends of the lower supporting steel beams 15 are fixed on the sides of each beam, and the lower ends are fixed on the rock mass.

[0048] like Figure 7 As shown, in this embodiment, a steel rod support is provided at the lower end of the lower supporting steel beam 15, and the steel rod support includes a support steel plate 11 and several fixed round steels 12 extending into the rock mass, and the upper ends of the fixed round steels 12 are fixed to the bottom surface of the support steel plate 11.

[0049] The support steel plate 11 is a 600×600×20mm Q235 steel plate, and the fixed round steel 12 is a solid round steel with a diameter of 95mm.

[0050] In this embodiment, the lower supporting steel beam 15 is a seamless steel pipe with a diameter of 300 mm and a wall thickness of 30 mm.

[0051] In this embodiment, the left reaction frame side beam 6, the left reaction frame upper side beam 7, the reaction frame top beam 8, the right reaction frame upper side beam 9, and the right reaction frame side beam 10 are all equipped with locking steel plates 13 that closely adhere to the segment lining surface. These locking steel plates 13 are welded to the reaction frame to form an integral unit. The gap between the locking steel plates 13 and the segment surface should be controlled between 2-3 mm. The locking steel plates 13 are 300×300×20 mm Q235 steel plates.

[0052] The specific installation steps of this embodiment are:

[0053] Step ①: Clean the starting cavern and perform the initial spraying with C25 wet shotcrete to ensure that the starting cavern meets the flatness standards. At the same time, implement advanced support and grouting reinforcement measures in the weak surrounding rock area to increase the stability of the surrounding rock in the initial TBM starting section.

[0054] Step ②: After the flatness of the starting cavern in step ① meets the standard and the surrounding rock is stable, the support steel plate 11 and the fixed circle (12) are set out, and the fixed round steel 12 position is drilled; after the hole is drilled, the fixed round steel 12 is lowered and backfilled with M15 mortar.

[0055] Step ③, position the main beam of the reaction frame, and its center deviation should be controlled within 5mm; after the deviation is corrected, position and install the main beam of the reaction frame from bottom to top. The main beam structure uses 600×600×20mmQ235 steel plate and M8.8Φ22 high-strength bolts 20 riveted.

[0056] Step 4, after the strength of the M15 mortar in step 2 reaches 100%, the lower support steel beam 15 is positioned and installed, and the quality of the corner welding of the lower support steel beam 15 needs to reach the II level welding quality standard. After the installation of the lower support steel beam 15 is completed, the upper support steel beam 14 is positioned and installed, and the extrusion and damage to the waterproof material of the support surface should be avoided during the installation process.

[0057] Step 5, after the counterforce frame is installed, the locking steel plate 13 and the pipe lining surface are lofted. According to the design requirement of the pipe wedge shape, the gap should be controlled between 2-3mm.

[0058] The working principle is: 1. By increasing the sectional moment of inertia of the component, the bending and shear resistance of the overall structure of the counterforce frame is further increased.

[0059] 2. The support beam structure adopts a steel rod support to further increase the support capacity of the overall structure and further reduce the deformation of the counterforce frame structure.

[0060] 3. Under the premise of further reducing the deformation of the counterforce frame structure, the first ring pipe can be positioned and locked by the locking steel plate, and the assembly deviation is reduced. The reserved gap can prevent the pipe from being extruded and causing large error deformation during the subsequent launching process of the TBM.

[0061] The above description is not intended to limit the utility model in any form. Although the utility model has been disclosed through the above examples, it is not intended to limit the utility model. Any skilled person in the art can make some changes or modifications to the equivalent examples within the scope of the technical solution of the utility model without departing from the technical solution of the utility model. Any simple modification, equivalent change and modification of the above examples based on the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims

1. A TBM starting counterforce frame structure under the condition of weak surrounding rock and large longitudinal slope, characterized in that, The left counterforce frame side beam (6) and the right counterforce frame side beam (10) are respectively installed at the left and right ends of the counterforce frame bottom beam (1), and the left counterforce frame lower beam (3) and the right counterforce frame lower beam (4) are respectively installed on the counterforce frame bottom beam (1). The left counterforce frame connecting beam (2) is fixed at the right side of the left counterforce frame side beam (6) and the counterforce frame bottom beam (1), and the right counterforce frame connecting beam (5) is fixed at the left side of the counterforce frame bottom beam (1) and the right counterforce frame side beam (10). The left counterforce frame upper side beam (7), the counterforce frame top beam (8) and the right counterforce frame upper side beam (9) are sequentially connected, wherein the lower end of the left counterforce frame upper side beam (7) is connected with the upper end of the left counterforce frame side beam (6), and the lower end of the right counterforce frame upper side beam (9) is connected with the upper end of the right counterforce frame side beam (10). The counterforce frame bottom beam (1), the left counterforce frame connecting beam (2), the left counterforce frame lower beam (3), the right counterforce frame lower beam (4), the right counterforce frame connecting beam (5), the left counterforce frame side beam (6), the left counterforce frame upper side beam (7), the counterforce frame top beam (8), the right counterforce frame upper side beam (9) and the right counterforce frame side beam (10) are connected through steel plates (19), and the steel plates (19) and the beams are connected through high-strength bolts (20).

2. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 1, characterized in that, The left counterforce frame upper side beam (7), the counterforce frame top beam (8) and the right counterforce frame upper side beam (9) are provided with upper support steel beams (14).

3. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 1, characterized in that, The upper support steel beam (14) is composed of two H300 steel plates and 20mm Q235 steel plates welded on the flanges.

4. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 3, characterized in that, The left counterforce frame connecting beam (2), the left counterforce frame lower beam (3), the right counterforce frame lower beam (4), the right counterforce frame connecting beam (5), the left counterforce frame side beam (6) and the right counterforce frame side beam (10) are provided with lower support steel beams (15).

5. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 3, characterized in that, The lower support steel beam (15) is provided with a steel rod support.

6. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 5, characterized in that, The steel rod support includes a support steel plate (11) and a plurality of fixed round steels (12), and the upper end of the fixed round steel (12) is fixed to the bottom surface of the support steel plate (11).

7. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 6, characterized in that, The left counterforce frame side beam (6), the left counterforce frame upper side beam (7), the counterforce frame top beam (8), the right counterforce frame upper side beam (9) and the right counterforce frame side beam (10) are provided with locking steel plates (13) closely attached to the surface of the pipe lining.

8. The TBM launching counter-force frame structure under soft surrounding rock and large longitudinal slope conditions according to claim 5, characterized in that, The locking steel plate (13) is welded with the counterforce frame to form a whole.

9. The TBM launching counter-force frame structure according to claim 1, wherein, ​ 10. The TBM launching counter-force frame structure according to claim 9, wherein, ​

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