Shield launching well rail supporting device and construction method

Abstract

The invention discloses a shield launching well rail supporting device and a construction method, and relates to the technical field of shield construction, the shield launching well rail supporting device comprises a prefabricated concrete pier, and the prefabricated concrete pier is composed of a barrel body and concrete poured in the barrel body; the at least two groups of precast concrete piers are arranged side by side, the top of each group of precast concrete piers is connected with a first support, the side-by-side first supports are connected through second supports perpendicular to the first supports, and the second supports serve as sleepers of a horizontal transportation track. Concrete is poured in the barrel body to form the prefabricated concrete pier to replace I-shaped steel horse stool supporting leg laying rails, and the compressive strength and the stability are high; the waste oil drum can be recycled, and the construction cost is reduced; and the construction method is simple and convenient to operate.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to a shield launching shaft track support device and a construction method. Background Art

[0002] Horizontal transportation of shield construction is generally carried out by battery vehicles. Transportation tracks are arranged on the floor of the interval tunnel and subway station to complete the transportation of all materials and shield slag. The sinking section of the shield starting (receiving) shaft is about 1.3~1.6m deeper than the standard section floor. After the main structure of the station provides the shield starting conditions, the measurement is introduced into the structure based on the ground wire and plane control points, and the coordinate elevation of the center of the shield steel ring and the outer point of the cross are actually measured. After the re-measurement is completed, it is reviewed by a third-party measurement unit. After the portal steel ring is re-measured, the bottom plate backfill elevation is determined according to the portal elevation and the shield starting bracket design drawings. The bottom plate backfill is made of concrete, and the bottom plate elevation after backfill is measured and re-measured. According to the re-measurement data, it is determined whether the backfill elevation meets the use requirements to ensure the smooth start of the shield machine.

[0003] After the shield excavation and entry ring acceptance is passed, the negative ring segments, reaction frames, and starting brackets are removed. In order to improve the transportation capacity of the battery car, the battery car is transported in double groups, and the track and turnout are re-laid. Stirrups are set in the sinking section of the shield starting (receiving) shaft. The horse stool is made of 20-section steel, and the track is laid on the horse stool. The track and the steel are fixed with pressure plate bolts, and the battery car is operated for horizontal transportation. Since the horse stool is welded with I-beams, each horse stool consists of a crossbeam and four I-beam legs. The I-beam uses a large amount of steel, the cost is high, the construction period is long, and the welding quality is difficult to control; at the same time, the I-beam weld is subjected to the dynamic load during the operation of the battery car for a long time, which affects the strength of the weld. The service life of the weld cannot be guaranteed, which may cause the horse stool to deform and become unstable, affecting the horizontal transportation of the battery car. In addition, the installation of the horse stool needs to adjust the slope of the battery car running track according to the design axis of the interval tunnel, which is easy to cause the height of each horse stool to be inconsistent, and the processing accuracy requirements are high, and the process is complicated. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a shield starting shaft track support device and construction method, in which concrete is poured in the barrel body to form a precast concrete pier to replace the I-beam horse stool legs for laying the track, with high compressive strength and stability; abandoned oil drums can be reused to reduce construction costs; and the construction method is simple and easy to operate.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, an embodiment of the present invention provides a shield launch shaft track support device, comprising a precast concrete pier, wherein the precast concrete pier is composed of a barrel and concrete poured in the barrel; At least two groups of precast concrete piers are arranged side by side, and the top of each group of precast concrete piers is connected with a first support. The side-by-side first supports are connected through second supports perpendicular thereto, and the second supports serve as sleepers of the horizontal transport track.

[0006] As a further implementation, the precast concrete pier is pre-embedded with lifting steel bars, and the lifting steel bars extend to the outside of the barrel.

[0007] As a further implementation method, the hoisting steel bars are perpendicular to the axial direction of the barrel body, and the hoisting steel bars are symmetrically arranged on both sides of the barrel body.

[0008] As a further implementation, the precast concrete pier is pre-embedded with positioning steel bars, which extend from the top of the barrel and are used to position the first support.

[0009] As a further implementation method, positioning steel bars are provided on both sides of the first support.

[0010] As a further implementation method, the positioning steel bars are arranged parallel to the axis of the barrel body.

[0011] In a second aspect, an embodiment of the present invention further provides a construction method of a shield launching shaft track support device, comprising: Determine the location and spacing of precast concrete piers; Use waste gas oil drums as the barrel body of prefabricated concrete piers, and embed lifting steel bars and positioning steel bars in the barrel body; Pour concrete into the barrel. After the concrete reaches the designed strength, install the first support on the top of each set of precast concrete piers. The second support is installed in a direction perpendicular to the first support, and the second support is used as a sleeper of the horizontal transport track.

[0012] As a further implementation method, two rows of precast concrete piers are arranged along the tunnel axis at a set distance on both sides of the tunnel centerline; Based on the re-measured elevation of the shield starting shaft bottom plate and the slope of the designed axis of the section tunnel, the position and height of each precast concrete pier are measured and marked out.

[0013] As a further implementation method, the exhaust gas oil barrel is processed into a standard barrel body that meets the set size.

[0014] As a further implementation method, two rows of tracks are laid on the upper side of the second support, one row for the operation of the electric vehicle and the other row for the operation of the shield machine trolley.

[0015] The beneficial effects of the present invention are as follows: (1) The present invention pours concrete in the barrel body to form a precast concrete pier. Compared with the I-beam legs of the horse stool, the precast concrete pier has a larger cross-sectional size, higher concrete compressive strength and higher stability. Compared with the welding and fixing method of the I-beam of the horse stool, the precast concrete pier can withstand the dynamic load during the transportation of the battery vehicle for a long time and has good stability. It can also reuse the discarded oil drums and has low construction costs. The precast concrete pier is pre-embedded with lifting steel bars and positioning steel bars, which is convenient for movement and improves the installation accuracy of the first support, thereby improving the support stability.

[0016] (2) The present invention predetermines the position of the precast concrete pier, places the exhaust gas barrel at the corresponding position, and then pours concrete. After a period of curing, the first support and the second support are installed, and then the track is laid. Compared with the existing horse stool support method, the welding workload is significantly reduced and the construction method is simple. Even after pouring concrete, if there is a deviation in the position of the precast concrete pier, adaptive adjustment can be made. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 This is a schematic diagram of the installation of the standard section floor track of the station; Figure 2 is a front view of a precast concrete pier according to one or more embodiments of the present invention; Figure 3 is a top view of a precast concrete pier according to one or more embodiments of the present invention; Figure 4 It is a schematic diagram of the installation of a precast concrete pier and a first support and a second support according to one or more embodiments of the present invention; Figure 5 It is a schematic diagram of the overall arrangement of the support device of one or more embodiments of the present invention.

[0019] Among them, 1. precast concrete pier, 2. barrel, 3. lifting steel bars, 4. positioning steel bars, 5. first support, 6. second support, 7. track, 8. shield starting shaft, 9. section tunnel. DETAILED DESCRIPTION It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0020] Embodiment 1: In a typical embodiment of the present invention, Figure 2-Figure 5 As shown, a shield starting shaft track support device is provided.

[0021] like Figure 1 As shown, currently, shield horizontal transportation mostly adopts the method of laying tracks 7 on the station floor. Two rows of tracks 7 are laid on the standard section floor of the station, one row is used for battery car operation, and the other row is used for shield machine trolley operation. Since the battery car's dead weight (50t) and the weight of the slag (140t) when transporting slag on the horse stool are about 190t in total, the load under the vertical gravity is large, and the horizontal force during the operation of the battery car is also high, which has high requirements for the bearing capacity and stability of the I-beam; and the horse stool uses a large amount of steel for the I-beam, which is high in cost and difficult to control the welding quality. The weld of the I-beam is easily affected by the dynamic load during the operation of the battery car, resulting in deformation and instability of the horse stool; the installation of the horse stool needs to adjust the slope of the battery car running track according to the design axis of the interval tunnel 9, resulting in inconsistent height of each horse stool, high processing accuracy requirements, and complex process.

[0022] Based on this, this embodiment provides a shield starting shaft track support device, in which concrete is poured in the barrel 2 to form a precast concrete pier 1, the I-beam horse stool legs are replaced, and the battery vehicle transport track is laid.

[0023] Below, the above-mentioned shield starting shaft track support device is described in detail with reference to the accompanying drawings.

[0024] The shield starting shaft track support device includes at least two groups of precast concrete piers 1, which form the main support for the track 7. Considering the need to reduce the number of precast concrete piers 1 while ensuring the support strength to save costs and construction difficulty, this embodiment uses two groups of precast concrete piers 1.

[0025] like Figure 5 As shown, two groups of precast concrete piers 1 are arranged side by side, and each group of precast concrete piers 1 is provided with a plurality of precast concrete piers 1, and the precast concrete piers 1 are evenly distributed at intervals; for each group of precast concrete piers 1, a first support 5 is connected to each precast concrete pier 1 at a certain interval, and the first supports 5 of the same group are welded and fixed into a whole; the first supports 5 of the two groups of precast concrete piers 1 are parallel to each other, and the two are connected by a second support 6, the plane where the second support 6 is located is parallel to the plane where the first support 5 is located, and the second support 6 is perpendicular to the first support 5; the second support 6 serves as a sleeper for a horizontal transport track.

[0026] Specifically, Figure 2-Figure 4 As shown, the precast concrete pier 1 includes a barrel 2, concrete, etc. The barrel 2 uses waste oil barrels at the construction site to achieve waste utilization and save costs. The precast concrete pier 1 is pre-embedded with lifting steel bars 3, which facilitate the movement of the precast concrete pier 1. The precast concrete pier 1 is also pre-embedded with positioning steel bars 4 for positioning the first support 5 to ensure its horizontality.

[0027] Among them, the lifting steel bar 3 is arranged perpendicular to the axis direction of the barrel body 2 and extends a certain length from the outer wall of the barrel body 2; in order to ensure balanced lifting, the lifting steel bars 3 extend on both sides of the barrel body 2 symmetrically, that is, two lifting points are formed. Of course, three or more lifting points can also be set, as long as the lifting steel bars 3 are evenly distributed. The setting position of the lifting steel bar 3 can be located in the middle position of the barrel body 2 along the height direction, or a certain position above the middle.

[0028] The positioning steel bars 4 are arranged in a direction parallel to the axis of the barrel body 2, and the positioning steel bars 4 are higher than the top surface of the precast concrete pier 1 by a certain length; in order to form a limit on both sides of the first support 5, two groups of positioning steel bars 4 are arranged at intervals, and the two groups of positioning steel bars 4 are arranged symmetrically relative to the center line of the barrel body 2; each group of positioning steel bars 4 can be provided with two or more to ensure positioning accuracy.

[0029] In this embodiment, the hanging steel bars 3 and the positioning steel bars 4 are made of Φ25 threaded steel bars; this size can be adaptively adjusted according to actual requirements.

[0030] like Figure 4 As shown, the first support 5 is arranged at the middle position of the top surface of the precast concrete pier 1 and between two sets of positioning steel bars 4, and is connected to the remaining precast concrete piers 1 through the first support 5; the setting direction of the first support 5 is parallel to the length direction of the track 7. Figure 5 As shown, two groups of precast concrete piers 1 correspond one to one, and the corresponding precast concrete piers 1 are connected by a second support 6, and the second support 6 is fixed on the upper side of the first support 5; a track 7 is set on the upper side of the second support 6, wherein the inner track is a battery car track 7, and the outer track is a shield machine trolley track 7.

[0031] In this embodiment, both the first support 5 and the second support 6 are made of I-beams. Since the first support 5 bears more force, H200 I-beams are selected as the first support 5 and H160 I-beams are selected as the second support 6. It can be understood that in other embodiments, the models of the first support 5 and the second support 6 can be adjusted according to actual requirements.

[0032] Compared with the I-beam legs of the horse stool, the precast concrete pier 1 of this embodiment has a larger cross-sectional size, higher concrete compressive strength and higher stability. Compared with the welding and fixing method of the horse stool I-beam, it can withstand the dynamic load during the transportation of the battery vehicle for a long time and has good stability. It can also reuse discarded oil drums, and the construction cost is low.

[0033] Embodiment 2: This embodiment provides a construction method of a shield launch shaft track support device, based on the support device described in Example 1, including the following steps: (1) Remove the negative ring segments, reaction frames, and starting brackets, clean the silt and other debris in the shield starting shaft 8, and lay out two rows of precast concrete piers 1 along the tunnel axis at 0.8 m on both sides of the tunnel centerline. The spacing between each row of precast concrete piers 1 is 1.2 m.

[0034] (2) Based on the re-measured elevation of the bottom plate of the shield starting shaft 8 and the slope of the designed axis of the interval tunnel 9, the position and height of each concrete pier are measured and marked out.

[0035] (3) Use discarded oil drums, place them according to the measured points, and process them according to the measured height.

[0036] Conventional shield construction sites use No. 46 hydraulic oil and No. 220 gear oil. The specifications of standard oil barrels are usually 200L, 80cm in diameter and 120cm in height.

[0037] (4) A Φ25 threaded steel bar is pre-embedded in the horizontal direction in the middle of the barrel body 2 as a lifting steel bar 3 to facilitate the movement of the precast concrete pier 1 after it is formed.

[0038] (5) Pour C20 concrete into the barrel 2, and embed 4 Φ25 threaded steel bars on the top as positioning steel bars 4 for positioning the first support 5. Curing for 28 days.

[0039] (6) After the concrete reaches the designed strength, H200 I-beams are installed on each row of precast concrete piers 1 as the first support 5.

[0040] (7) Install H160 I-beam (second support 6) perpendicular to H200 I-beam as sleeper of horizontal transport track, lay two rows of 43Kg / m track 7 on the second support 6, of which the inner track is used for battery car operation and the outer track is used for shield machine trolley operation. The inner-to-inner gauge of the outer track (the distance between the inner sides of the outer track head) is 2180mm (which can be adjusted according to the requirements of shield machine design drawings), and the inner-to-inner gauge of the inner track is 900mm (which can be adjusted according to the requirements of battery car design drawings). The sleepers and tracks 7 are fixed by welding with steel plates.

[0041] In this embodiment, the position of the precast concrete pier 1 is determined in advance, and the oil drum of exhaust gas is placed at the corresponding position, and then concrete is poured. After a period of curing, the first support 5 and the second support 6 are installed, and then the track 7 is laid. Compared with the existing horse stool support method, the welding workload is significantly reduced and the construction method is simple; even after pouring the concrete, if there is a deviation in the position of the precast concrete pier 1, adaptive adjustment can be made.

[0042] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shield starting shaft track support device, characterized in that: It comprises a precast concrete pier, which is composed of a barrel and concrete poured in the barrel; At least two groups of precast concrete piers are arranged side by side, and the top of each group of precast concrete piers is connected with a first support. The side-by-side first supports are connected through second supports perpendicular thereto, and the second supports serve as sleepers of the horizontal transport track.

2. A shield launching shaft track support device according to claim 1, characterized in that: The precast concrete pier is pre-embedded with lifting steel bars, and the lifting steel bars extend to the outside of the barrel body.

3. A shield launching shaft track support device according to claim 2, characterized in that: The hoisting steel bars are perpendicular to the axial direction of the barrel body, and the hoisting steel bars are symmetrically arranged on both sides of the barrel body.

4. A shield launching shaft track support device according to any one of claims 1 to 3, characterized in that: The precast concrete pier is pre-embedded with positioning steel bars, which extend from the top of the barrel body and are used to position the first support.

5. A shield launching shaft track support device according to claim 4, characterized in that: Positioning steel bars are provided on both sides of the first support.

6. A shield launching shaft track support device according to claim 4, characterized in that: The positioning steel bars are arranged parallel to the axis of the barrel body.

7. A construction method for a shield launching shaft track support device according to any one of claims 1 to 6, characterized in that: include: Determine the location and spacing of precast concrete piers; Use waste gas oil drums as the barrel body of prefabricated concrete piers, and embed lifting steel bars and positioning steel bars in the barrel body; Pour concrete into the barrel. After the concrete reaches the designed strength, install the first support on the top of each set of precast concrete piers. The second support is installed in a direction perpendicular to the first support, and the second support is used as a sleeper of the horizontal transport track.

8. The construction method of a shield launching shaft track support device according to claim 7, characterized in that: Two rows of precast concrete piers are arranged along the tunnel axis at a set distance on both sides of the tunnel centerline; Based on the re-measured elevation of the shield starting shaft bottom plate and the slope of the designed axis of the section tunnel, the position and height of each precast concrete pier are measured and marked out.

9. The construction method of a shield launching shaft track support device according to claim 7, characterized in that: Process the waste gas oil barrels into standard barrels that meet the set dimensions.

10. The construction method of a shield launching shaft track support device according to claim 7, characterized in that: Two rows of tracks are laid on the upper side of the second support, one row for the operation of the electric vehicle and the other row for the operation of the shield machine trolley.

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