Steel sleeve system structure for researching shield receiving model test

Abstract

A steel sleeve system structure for researching a shield receiving model test comprises lower barrels and upper barrels, the multiple sections of lower barrels and upper barrels are in butt joint and buckled together, arc-shaped butt joint edges are arranged on the edges of the adjacent lower barrels and upper barrels, horizontal supporting transverse rods and vertical supporting vertical rods are arranged in the lower barrels and the upper barrels respectively, and the arc-shaped butt joint edges are connected with the arc-shaped butt joint edges. The two ends of the supporting transverse rod are fixedly connected with the inner side wall of the corresponding lower barrel or the upper barrel respectively, one end of the supporting vertical rod is perpendicularly and fixedly connected with the middle of the supporting transverse rod, the other end of the supporting vertical rod is fixedly connected with the inner side wall of the corresponding lower barrel or the upper barrel, and the supporting bases are fixed to the side faces of the bottoms of the sections of lower barrels respectively. According to the utility model, through a model test, the steel sleeve is controlled to receive parameter control and matters needing attention at each stage, and the influence on an adjacent bridge pile structure and normal traffic in a shield receiving and tunneling process is reduced, so that the construction safety of shield receiving under complex conditions is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transportation engineering, in particular to a steel sleeve system structure for studying a shield receiving model test. Background Art

[0002] Shield machine acceptance is one of the most risky processes in urban rail transit projects, especially under adverse geological conditions and construction environments. For example, the shield acceptance project is located between the main station structure and the overpass structure. Due to the small distance between the main station structure and the overpass structure, the shield tunnel acceptance construction process may have an adverse impact on the overpass pile foundation. Many factors need to be considered during construction. The freezing method combined with the steel sleeve shield acceptance is an effective way to address environmental safety control. Due to the different geological environmental conditions in different regions, numerical simulation methods can simulate relevant environmental factors, but their practical application is limited. If model tests are conducted, a more intuitive understanding of shield acceptance construction will be achieved. In particular, the construction process and construction parameter adjustments can be visualized, as well as simulated to deal with other adverse factors during construction. Model tests have strong guiding significance. Currently, there is a lack of a shield acceptance model structure that can easily adjust technical parameters. This leads to inaccurate collected construction parameters, requiring repeated adjustments during construction, which is not conducive to shortening the construction period and ensuring construction quality. Therefore, a steel sleeve structure that can be used for shield acceptance model tests is urgently needed. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide a steel sleeve system structure for studying shield receiving model tests.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a steel sleeve system structure for studying a shield receiving model test, wherein the steel sleeve system structure comprises a plurality of cylinders, each of the cylinders in the plurality of cylinders is detachably connected end to end along the axial direction, each of the cylinders comprises a lower cylinder and an upper cylinder, the lower cylinder and the upper cylinder are detachably buckled together, the edges of the two ends of the lower cylinder and the upper cylinder are respectively provided with arc-shaped butt joint edges extending outward in the radial direction, and the adjacent lower cylinders and the adjacent upper cylinders are respectively detachably connected end to end. The lower cylinder and the upper cylinder are connected, and a horizontal supporting cross bar and a vertical supporting vertical bar are respectively provided inside the cylinder, and the two ends of the supporting cross bar are respectively connected to the inner side wall of the lower cylinder or the upper cylinder, and one end of the supporting vertical bar is vertically connected to the middle part of the supporting cross bar, and the other end of the supporting vertical bar is connected to the inner side wall of the lower cylinder or the upper cylinder. A supporting base is provided on the bottom outer side surface of the lower cylinder, and an arc-shaped edge structure is provided on the top of the supporting base, and the arc-shaped edge structure is connected to the bottom outer side surface of the lower cylinder in a matching manner.

[0005] Furthermore, the outer walls of the lower cylinder and the upper cylinder are provided with a plurality of semi-annular reinforcing ribs, and the plurality of semi-annular reinforcing ribs are respectively vertically connected to the outer walls of the lower cylinder and the upper cylinder in the circumferential direction, and the plurality of semi-annular reinforcing ribs are spaced apart in the axial direction on the outer walls of the lower cylinder and the upper cylinder.

[0006] Furthermore, the front and rear side surfaces of the connection portion between the support vertical rod and the support cross rod along the axial direction are respectively provided with reinforcement connecting plates, and the reinforcement connecting plates are jointly connected to both sides of the support vertical rod and the support cross rod to enhance the stability of the connection between the support vertical rod and the support cross rod.

[0007] Furthermore, a connecting sleeve part is provided at the connection between the supporting vertical rod and the supporting cross rod, and the connecting sleeve part is a T-shaped reinforcement part, and the T-shaped reinforcement part includes a horizontal sleeve and a vertical sleeve vertically connected to the horizontal sleeve, and the supporting cross rod passes through the horizontal sleeve and is fixed in the horizontal sleeve, or one end of the supporting cross rod is respectively connected to the two ends of the horizontal sleeve, and the other end of the supporting cross rod is respectively connected to the inner side walls of the lower cylinder and the upper cylinder, and one end of the supporting vertical rod away from the inner side walls of the lower cylinder and the upper cylinder is connected to the end of the vertical sleeve.

[0008] Furthermore, inclined oblique support rods are respectively provided on both sides of the support vertical rod, one end of the oblique support rod is connected to both sides of the connecting sleeve member, and the other end of the oblique support rod is connected to the inner side wall of the lower cylinder or the upper cylinder.

[0009] Furthermore, the outer side walls of the lower cylinder and the upper cylinder are provided with a plurality of connecting ribs, and the plurality of connecting ribs are evenly spaced apart in a circumferential arrangement along the axial direction of the lower cylinder or the upper cylinder, and the connecting ribs are vertically connected to the outer side walls of the lower cylinder and the upper cylinder, and the connecting ribs and the reinforcing ribs are vertically connected to each other, and the reinforcing ribs and the connecting ribs form a mesh reinforcement structure on the outer side walls of the lower cylinder and the upper cylinder.

[0010] Furthermore, the support base is a hollow structure, and the support base is provided with multiple support plates arranged vertically and in a grid shape. Multiple horizontal reinforcement plates are connected between the two ends of the support plates and the side walls of the support base. The support plates and the reinforcement plates together constitute the hollow structure.

[0011] Furthermore, arc-shaped supporting plates extend outward in a circumferential direction at both ends of the arc-shaped edge structure at the top of the support base, the lower cylinder is supported on the arc-shaped edge structure of the support base, and the supporting plates are further wrapped around and connected to the outer side wall of the lower cylinder.

[0012] Furthermore, both sides and the middle portion of the bottom of the support base are respectively connected with bottom plates, and the outer edges of the bottom plates extend out of the plane of the support base.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] (1) This utility model studies the interval shield and the "steel sleeve + horizontal freezing reinforcement" construction process through model tests. By controlling the parameters and precautions of each stage of steel sleeve reception, the impact of the shield on the adjacent bridge pile structure and normal traffic during the shield reception excavation process is reduced, thereby ensuring the construction safety of the shield reception under complex conditions.

[0015] (2) The utility model can be made into a scaled-down model, such as a 1:50 scaled-down model, which not only saves space and is easy to process, but also can simulate the various stages of shield acceptance, so that the situation in each process can be intuitively felt. The steel sleeve system structure of the utility model is a part of the model test. By adjusting the relevant technical parameters, the original steel sleeve can be adjusted by adjusting the material strength, hardness, support structure fixing position, structural angle and other parameters to better meet the relevant requirements of the steel sleeve when the shield is accepted. After improving the relevant structural parameters, it can better help the model test research and then adjust the relevant shield excavation parameters.

[0016] (3) The mode of multi-section cylinder assembly + upper and lower cylinder combination adopted in the utility model can be applied to various specifications of steel sleeve structures in actual engineering projects, suitable for different engineering scales, and enhances the maneuverability and flexibility of the steel sleeve system structure.

[0017] (4) The present invention fills the gap in the structure of the steel sleeve system in the prior art, constructs a complete steel sleeve system structure, and further improves the model of the steel sleeve system structure. The mutual connection of the supporting vertical rods, supporting horizontal rods and oblique supporting rods in the cylinder ensures the overall stability of the cylinder structure. The mesh structure of the reinforcing ribs and connecting ribs makes the cylinder structure lighter and saves more materials while ensuring the strength of the cylinder structure. The hollow design of the support base, the matching connection that matches the outer side of the bottom of the cylinder, and the outward-extending support plate realize a more stable connection between the support base and the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the lower cylinder of the utility model;

[0020] Figure 3 It is a three-dimensional structural diagram of the support base of the utility model. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] The present embodiment is described in detail below with reference to the accompanying drawings:

[0024] This embodiment provides a steel sleeve system structure for studying the shield receiving model test. Please refer to the accompanying drawings in the specification. Figure 1-3 .

[0025] like Figure 1-3 As shown, a steel sleeve system structure for studying shield receiving model tests includes a lower cylinder 1 and an upper cylinder 2. Multiple sections of the lower cylinder 1 and the upper cylinder 2 are butt-jointed together. The edges of adjacent lower cylinders 1 and upper cylinders 2 are provided with arc-shaped butt-jointed edges 3, and the adjacent arc-shaped butt-jointed edges 3 are fixedly connected by bolts and nuts. Horizontal support cross bars 4 and vertical support vertical bars 5 are respectively provided in the lower cylinder 1 and the upper cylinder 2. The two ends of the support cross bars 4 are respectively fixedly connected to the corresponding inner side walls of the lower cylinder 1 or the upper cylinder 2. One end of the support vertical bar 5 is vertically fixedly connected to the middle part of the support cross bar 4, and the other end of the support vertical bar 5 is fixedly connected to the corresponding inner side wall of the lower cylinder 1 or the upper cylinder 2. A support base 6 is respectively fixed to the bottom side of each section of the lower cylinder 1, and the top edge of the support base 6 is an arc-shaped structure that matches the outer side surface of the lower cylinder 1.

[0026] Specifically: the outer side walls of the lower cylinder 1 and the upper cylinder 2 are also fixed with a plurality of semi-annular reinforcing ribs 7, and the reinforcing ribs 7 are vertically fixedly connected to the corresponding outer side walls of the lower cylinder 1 and the upper cylinder 2. The front and rear sides of the fixed connection parts of the support vertical rods 5 and the support cross rods 4 are respectively fixed with reinforced connecting plates 8. The two sides of the support vertical rods 5 are also respectively provided with inclined oblique support rods 9, one end of the oblique support rod 9 is vertically fixedly connected to the middle part of the support cross rod 4, and the other end of the oblique support rod 9 is fixedly connected to the corresponding inner side wall of the lower cylinder 1 or the upper cylinder 2;

[0027] Adjacent reinforcing ribs 7 are fixedly connected by a plurality of connecting ribs 10. The connecting ribs 10 are evenly arranged along the axis of the lower cylinder 1 or the upper cylinder 2, so that the reinforcing ribs 7 and the connecting ribs 10 form a mesh reinforcement structure on the periphery of the lower cylinder 1 and the upper cylinder 2;

[0028] The interior of the support base 6 is hollow and is provided with multiple support plates 11 arranged vertically in a grid pattern. Multiple horizontal reinforcing plates 12 are fixed between the two ends of the support plates 11 and the side walls of the support base 6. An arc-shaped supporting plate 13 is fixed in the top arc structure of the support base 6, and the support base 6 is indirectly fixedly connected to the lower cylinder 1 through the supporting plate 13. Bottom plates 14 are respectively fixed on both sides and the middle part of the bottom of the support base 6.

[0029] Working principle of the utility model: The receiving steel sleeve of the utility model is a barrel-shaped structure with one end open, that is, one end can be covered with an end cover. The total length of the entire sleeve is 11200mm (including the assembled rubber sealing plate), the diameter (inner diameter) is 6620mm, and the outer diameter is 6860mm. It consists of a transition connecting ring, a multi-section cylinder, a rear end cover, 3 columns, and left and right I-beam supports.

[0030] The cylinder can be divided into six sections, each of which is divided into upper and lower semicircles, namely the lower cylinder 1 and the upper cylinder 2. The maximum weight of a single section does not exceed 10 tons. The cylinder material is 20mm thick steel plate. The outer periphery of each section of the cylinder is welded with longitudinal and circumferential ribs (i.e. reinforcing ribs 7 and connecting ribs 10) to ensure the rigidity of the cylinder. The ribs are 20mm thick, 100mm high, and spaced approximately 550*600mm apart. The ends of each section of the cylinder and the upper and lower semicircular joint surfaces are welded with circular flanges, i.e. the arc-shaped butt joint edges 3, i.e. the arc-shaped butt joint edges 3 are made of 40mm thick plates. The upper and lower semicircles and the two sections of the cylinder are connected by M30 and 8.8 grade bolts, with 8mm thick rubber pads in the middle. The support base 6 at the bottom of the cylinder uses a 20mm plate as the load-bearing plate, the support plate 11 and the reinforcing plate 12 use 20mm plates, and the support plate 13 on the upper edge of the support base 6 is welded to the lower cylinder 1 as a whole.

[0031] Freezing reinforcement construction process: construction of borehole pipe → drilling of freezing hole → installation of freezer → start of active freezing → freezing effect reaches design conditions → shield machine pushes into tunnel portal (close to ground diaphragm, and a water-stop ring is installed at the tail of the shield, and the water-stop measures for the tunnel portal are ready) → shield machine excavates and grinds through the ground diaphragm and enters the steel sleeve → shield machine is received (frozen wall is thawed) → grouting of the segment wall at the tunnel portal position → removal of steel sleeve → construction of tunnel portal ring beam → end of freezing.

[0032] This utility model specifically accepts the construction operation process:

[0033] The first stage is when the shield machine is passing through. During this stage, the soil bin pressure is kept above 1.9 bar to block the formation water pressure and prevent the soil bin from gushing into the formation water and the screw machine from gushing. The advancement speed is controlled at 30m / min. The speed should not be too high, otherwise the torque will increase, which will affect the integrity of the reinforcement body. During the process, the monitoring frequency at the end of the shield shaft is increased, and the settlement data is read and analyzed in time to adjust the construction parameters. After each ring of the shield machine is advanced, a second double-liquid slurry ring injection is carried out 5 rings behind the pipe segment to block the water inflow from the rear.

[0034] The second stage is when the shield machine cutterhead enters the reinforcement body. After the steel sleeve is filled, the shield machine is started. In the second stage, the soil bin pressure is maintained above 2.0 bar to block the water behind the shield machine. The average advancement speed is controlled at 10-20 mm / min, and the shield machine posture is promptly monitored and adjusted. The control target is ±15 mm horizontally and +20-30 mm vertically. If there is any abnormality, the machine will be shut down immediately for processing. The frequency of end monitoring is increased to adjust the construction parameters. When assembling the segments, the cutterhead rotates at 0.5 rpm to prevent freezing. After each ring is advanced, a second double-liquid slurry hoop injection is performed 5 rings behind the segment to block the water from the rear.

[0035] The third stage is to enter the steel sleeve, and the shield machine is received in the steel sleeve, simulating the model test of this process. The model test can be adjusted according to the various construction parameters of the actual operation. The whole process simulated, including the freezing method, the specification parameters of the steel sleeve, and the parameter control of the simulated shield tunneling, is used as a reference for the actual project. Before the shield tail comes out of the last ring of segments, when there is 500mm left, the shield machine stops tunneling, grouting is carried out on the gap between the segments and the reinforcement, and secondary double-liquid slurry hoop grouting is carried out on the 3 rings behind the segments. Injection, block the water from the rear, track and monitor the situation of the top of the steel sleeve. If deformation exceeds the limit or leakage occurs, stop the shield excavation immediately, find the cause and take corrective measures, maintain the soil bin pressure above 1.2 bar to advance, so as to block the water source behind the shield machine, and control the thrust below 800T to prevent excessive thrust from causing deformation of the steel sleeve reaction frame. Increase the frequency of end monitoring, feedback settlement data in time, and guide the adjustment of construction parameters. For each ring advanced, perform a second double-liquid slurry ring injection 5 rings behind the segment to block the water from the rear.

[0036] Of course, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel sleeve system structure for studying shield receiving model test, characterized in that: The steel sleeve system structure includes a plurality of sections of cylinders, each of which is detachably connected end to end in the axial direction, and each of which includes a lower cylinder (1) and an upper cylinder (2), the lower cylinder (1) and the upper cylinder (2) being detachably buckled together, and the edges of both ends of the lower cylinder (1) and the upper cylinder (2) are respectively provided with arc-shaped butt joint edges (3) extending outward in the radial direction, and the adjacent lower cylinders (1) and the adjacent upper cylinders (2) are respectively detachably connected end to end, and the interior of the lower cylinder (1) and the upper cylinder (2) are respectively provided with horizontal The invention relates to a support cross bar (4) and a vertical support vertical bar (5), wherein the two ends of the support cross bar (4) are respectively connected to the inner side wall of the lower cylinder (1) or the upper cylinder (2), one end of the support vertical bar (5) is vertically connected to the middle part of the support cross bar (4), and the other end of the support vertical bar (5) is connected to the inner side wall of the lower cylinder (1) or the upper cylinder (2), and the bottom outer side surface of the lower cylinder (1) is provided with a support base (6), and the top of the support base (6) is provided with an arc-shaped edge structure, and the arc-shaped edge structure is connected to the bottom outer side surface of the lower cylinder (1) in a matching manner.

2. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: The outer side walls of the lower cylinder (1) and the upper cylinder (2) are provided with a plurality of semi-annular reinforcing ribs (7), the plurality of semi-annular reinforcing ribs (7) are respectively connected perpendicularly to the outer side walls of the lower cylinder (1) and the upper cylinder (2) in the circumferential direction, and the plurality of semi-annular reinforcing ribs (7) are arranged at intervals on the outer side walls of the lower cylinder (1) and the upper cylinder (2) in the axial direction.

3. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: Reinforced connecting plates (8) are respectively provided on the front and rear side surfaces of the connection portion of the support vertical rod (5) and the support cross rod (4) in the axial direction, and the reinforced connecting plates (8) are connected to both sides of the support vertical rod (5) and the support cross rod (4) to enhance the stability of the connection between the support vertical rod (5) and the support cross rod (4).

4. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: A connecting sleeve member is provided at the connection between the supporting vertical rod (5) and the supporting cross rod (4), and the connecting sleeve member is a T-shaped reinforcement member, and the T-shaped reinforcement member includes a horizontal sleeve and a vertical sleeve vertically connected to the horizontal sleeve. The supporting cross rod (4) passes through the horizontal sleeve and is fixed in the horizontal sleeve, or one end of the supporting cross rod (4) is respectively connected to the two ends of the horizontal sleeve, and the other end of the supporting cross rod (4) is respectively connected to the inner side walls of the lower cylinder (1) and the upper cylinder (2), and one end of the supporting vertical rod (5) away from the inner side walls of the lower cylinder (1) and the upper cylinder (2) is connected to the end of the vertical sleeve.

5. The steel sleeve system structure for studying shield receiving model test according to claim 4 is characterized in that: Inclined oblique support rods (9) are also provided on both sides of the support vertical rod (5), one end of the oblique support rod (9) is connected to both sides of the connecting sleeve, and the other end of the oblique support rod (9) is connected to the inner side wall of the lower cylinder (1) or the upper cylinder (2).

6. The steel sleeve system structure for studying shield receiving model test according to claim 2 is characterized in that: The outer side walls of the lower cylinder (1) and the upper cylinder (2) are provided with a plurality of connecting ribs (10), and the plurality of connecting ribs (10) are evenly spaced apart in a circumferential arrangement along the axial direction of the lower cylinder (1) or the upper cylinder (2), and the connecting ribs (10) are vertically connected to the outer side walls of the lower cylinder (1) and the upper cylinder (2), and the connecting ribs (10) and the reinforcing ribs (7) are vertically connected to each other, and the reinforcing ribs (7) and the connecting ribs (10) form a mesh reinforcement structure on the outer side walls of the lower cylinder (1) and the upper cylinder (2).

7. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: The support base (6) is a hollow structure, and the support base (6) is provided with a plurality of support plates (11) arranged vertically and in a grid pattern, and a plurality of horizontal reinforcement plates (12) are connected between the two ends of the support plates (11) and the side walls of the support base (6), and the support plates (11) and the reinforcement plates (12) together constitute the hollow structure.

8. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: Arc-shaped supporting plates (13) extend outwardly in a circumferential direction at both ends of the arc-shaped edge structure at the top of the support base (6); the lower cylinder (1) is supported on the arc-shaped edge structure of the support base (6), and the supporting plates (13) are further wrapped around and connected to the outer side wall of the lower cylinder (1).

9. The steel sleeve system structure for studying shield receiving model test according to claim 1 is characterized in that: Bottom plates (14) are respectively connected to both sides and the middle portion of the bottom of the support base (6), and the outer edge of the bottom plate (14) extends beyond the plane of the support base (6).

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