A circular precast column structure for inspection pits and its installation method

Abstract

The present invention relates to a circular precast column structure for inspection pits and an installation method thereof, which includes a circular precast column installed in a reserved installation groove of a cast-in-place foundation. The shape, size, and depth of the reserved installation groove all meet the installation requirements of the circular precast column. The circular precast column includes a steel bar mesh, a number of embedded extended nuts arranged along the circumference direction of the steel bar mesh, and concrete wrapped around the outer side surfaces of the embedded extended nuts and the steel bar mesh. A stainless steel circular hoop is embedded at the notch of the reserved installation groove, and a number of bolt installation holes are provided along the circumference direction of the stainless steel circular hoop. The circular precast column and the stainless steel circular hoop are connected through the cooperation of extended bolts with the bolt installation holes and the embedded extended nuts. The advantages of the present invention are as follows: it can achieve the rapid installation of the circular precast column, effectively improve the construction efficiency, shorten the construction time, and save costs while ensuring reliable connection; it can effectively improve the positioning accuracy of the circular precast column and ensure the smoothness of the track laid on the circular precast column.

Description

Technical Field

[0001] The present invention relates to the technical field of track construction, and in particular to an inspection pit circular precast column structure and an installation method thereof. Background Art

[0002] Rail transit such as urban subways can effectively relieve the ground traffic pressure and solve problems such as urban congestion and air pollution. With the development of rail transit, the number of supporting vehicle depots under construction has increased accordingly. However, the construction speed of traditional in-situ casting cannot meet the needs of rapid development. Especially for those components that are difficult to form manually, it will consume a large amount of manpower, material resources and time, resulting in an increase in project costs.

[0003] For prefabricated and assembled components, the factory can prefabricate or semi-prefabricate concrete components with high standardization, large quantity and difficult manual construction used in the construction of vehicle depots, and directly install and fix them on the construction site and then put them into use, which can greatly improve the construction speed, save construction costs and avoid waste of resources.

[0004] In the existing inspection pit columns of subway vehicle depots, the consumption is large, and rectangular in-situ cast structures are often used. They have a large floor area, are difficult to form, have a long construction period, and cannot guarantee accuracy at the same time. Summary of the Invention

[0005] The purpose of the present invention is to provide an inspection pit circular precast column structure and an installation method thereof according to the deficiencies of the above-mentioned existing technologies. The circular precast column and the stainless steel circular hoop are connected by bolts, which is not only reliable in connection but also convenient for disassembly and installation.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] An inspection pit circular precast column structure, characterized in that: it includes a circular precast column installed in a reserved installation groove of a cast-in-place foundation. The shape, size and depth of the reserved installation groove all meet the installation requirements of the circular precast column. The circular precast column includes a steel mesh, a number of embedded extended nuts arranged along the circumference of the steel mesh, and concrete wrapped around the outer side of the embedded extended nuts and the steel mesh. A stainless steel circular hoop is embedded at the notch of the reserved installation groove. The shape and size of the stainless steel circular hoop are adapted to the shape and size of the circular precast column. A number of bolt installation holes are arranged along the circumference of the stainless steel circular hoop. The arrangement position, quantity, shape and size of the bolt installation holes of the stainless steel circular hoop are adapted to the arrangement position, quantity, shape and size of the embedded extended nuts of the circular precast column. The circular precast column and the stainless steel circular hoop are connected by the cooperation of extended bolts with the bolt installation holes and the embedded extended nuts.

[0008] The embedded extended nut is welded to the steel bar mesh through the nut welding steel bar on it, and the nut welding steel bars are welded through the steel bar between the nuts.

[0009] A number of portal steel bars are welded along the circumferential direction of the stainless steel circular hoop, and the portal steel bars are connected to the reinforcement of the cast-in-place foundation.

[0010] The bolt mounting holes of the stainless steel circular hoop are oval.

[0011] The top of the circular precast column is provided with a rail bottom slope and is embedded with a fastener bolt sleeve.

[0012] An installation method for the inspection pit circular precast column structure related to the above, characterized in that: the installation method includes the following steps:

[0013] a. Set a reserved installation groove through the cast-in-place foundation and embed the stainless steel circular hoop, and hoist and install the circular precast column into the reserved installation groove of the cast-in-place foundation;

[0014] b. Adjust the installation height of the circular precast column. When the height is insufficient, adjust its height by setting an adjustment pad under the circular precast column until the installation height requirement is met;

[0015] c. Align the embedded extended nut of the circular precast column with the bolt mounting hole of the stainless steel circular hoop, and tighten and fix it with an extended bolt;

[0016] d. After the circular precast column and the stainless steel circular hoop are fixed, install the fastener and the rail on the top of the circular precast column.

[0017] The fastener is installed and fixed by embedding a fastener bolt sleeve at the top end of the circular precast column.

[0018] The advantages of the present invention are: the rapid installation of the circular precast column can be realized. While ensuring reliable connection, the construction efficiency can be effectively improved, the construction time can be shortened, and the cost can be saved; the positioning accuracy of the circular precast column can be effectively improved, and the line smoothness of the rail erected on the circular precast column can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the installation structure schematic diagram of the present invention;

[0020] Figure 2 is the top view of the present invention;

[0021] Figure 3 is the structure schematic diagram of the circular precast column of the present invention;

[0022] Figure 4 is Figure 3 the sectional view taken along A-A of

[0023] Figure 5 For Figure 3 sectional view along line B-B;

[0024] Figure 6 is the plan view of the stainless steel circular hoop of the present invention;

[0025] Figure 7 is the sectional view of the stainless steel circular hoop of the present invention;

[0026] Figure 8 is the structural schematic diagram of the cast-in-situ foundation of the present invention. Specific embodiments

[0027] The features of the present invention and other related features will be further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0028] As Figures 1-8 shown, the labels 1-13 in the figure respectively represent: cast-in-situ foundation 1, reserved installation groove 2, circular precast column 3, steel mesh 4, embedded extended nuts 5, stainless steel circular hoop 6, bolt installation holes 7, nut welding steel bars 8, nut-to-nut welding steel bars 9, portal steel bars 10, fastener bolt sleeves 11, fasteners 12, and steel rails 13.

[0029] Embodiment: The circular precast column structure of the inspection pit in this embodiment is used in the inspection pit for track trains during maintenance.

[0030] As Figures 1-8 shown, this embodiment mainly includes a reserved installation groove 2, a circular precast column 3, and a stainless steel circular hoop 6. The reserved installation groove 2 is pre-formed during the construction of the cast-in-situ foundation 1 for installing the circular precast column 3. The shape, size, and depth of the reserved installation groove 2 all meet the installation requirements of the circular precast column 3. A stainless steel circular hoop 6 is embedded at the opening of the reserved installation groove 2. The shape and size of the stainless steel circular hoop 6 are adapted to the shape and size of the circular precast column 3. The circular precast column 3 can be installed in the reserved installation groove 2 through the stainless steel circular hoop 6. In addition, the spacing of the reserved installation grooves 2 should meet the spacing requirements of the fasteners 12, and the depth is 500 mm.

[0031] As Figure 3 , Figure 4 and Figure 5As shown in the figure, the circular precast column 3 includes a steel mesh 4, four embedded extended nuts 5, and concrete wrapped around the outer side of the embedded extended nuts 5 and the steel mesh 4. The four embedded extended nuts 5 are symmetrically arranged along the circumference of the steel mesh 4. The embedded extended nuts 5 are of M24 model and have a length of 50 mm. Among them, nut welding steel bars 8 are provided on the embedded extended nuts 5. By welding the nut welding steel bars 8 to the steel mesh 4 and adding concrete, the four embedded extended nuts 5 can be effectively fixed. In addition, the nut welding steel bars 8 can be welded to each other through inter-nut welding steel bars 9, further strengthening the stability of the embedded extended nuts 5.

[0032] As Figure 6 and Figure 7 shown in the figure, the stainless-steel circular hoop 6 is provided with four bolt mounting holes 7 along its circumference. The arrangement position, quantity, shape, and size of the bolt mounting holes 7 of the stainless-steel circular hoop 6 are all adapted to the arrangement position, quantity, shape, and size of the embedded extended nuts 5 of the circular precast column 3. The circular precast column 3 and the stainless-steel circular hoop 6 are connected through the cooperation of extended bolts with the bolt mounting holes 7 and the embedded extended nuts 5. The stainless-steel circular hoop 6 can effectively position the circular precast column 3. On the one hand, it ensures that the alignment of the circular precast column 3 can be precisely consistent with the designed track alignment. On the other hand, when a rail bottom slope is set at the top of the circular precast column 3, the designed positions of the bolt mounting holes 7 and the embedded extended nuts 5 can effectively ensure the consistency of the rail bottom slopes of each circular precast column 3, thereby improving the smoothness of the rail 13 erected on the circular precast column 3 and facilitating construction. The positioning step is omitted. In addition, the bolt mounting holes 7 on the stainless-steel circular hoop 6 are elliptical. The use of elliptical mounting holes is beneficial to adapting to installation errors. The stainless-steel circular hoop 6 is welded with a portal-shaped steel bar 10 along its circumference. The portal-shaped steel bar 10 is selected as an HRB400 portal-shaped steel bar, and the portal-shaped steel bar 10 is connected to the reinforcement of the cast-in-place foundation 1.

[0033] As Figure 1 and Figure 2 shown in the figure, the circular precast column 3 is precast with HRB400 steel bars and C40 concrete. A 1:40 rail bottom slope is set at its top, and a fastener bolt sleeve 11 is embedded. The fastener bolt sleeve 11 is used to install the fastener 12, and the rail 13 is installed and fixed by the fastener 12, so that the rail 13 can be stably fixed on the circular precast column 3; As Figure 2 shown in the figure, several circular precast columns 3 are arranged at intervals in the inspection pit, and the rail 13 is erected on several circular precast columns 3 to provide a driving line for the rail vehicle to drive into the inspection pit.

[0034] In this embodiment, the circular precast column 3 uses four embedded extended nuts 5, and the quantity can also be appropriately adjusted according to construction requirements to meet the connection and fixing needs with the stainless-steel circular hoop 6.

[0035] In addition, in combination with Figures 1 to 8As shown in the figure, this embodiment further includes an installation method for a circular precast column structure of an inspection pit, and the installation method includes the following steps:

[0036] a. Pre-set a reserved installation groove 2 and embed a stainless steel circular hoop 6 in advance through the cast-in-place foundation 1, and hoist and install the circular precast column 3 into the reserved installation groove 2 of the cast-in-place foundation 1. Among them, the circular precast column 3 can be obtained by precasting, which can effectively improve the construction efficiency, shorten the construction time, and save costs.

[0037] b. Adjust the installation height of the circular precast column 3, and solve the insufficient height by setting a 1-mm adjustment shim under the circular precast column 3. Specifically, the thickness or the number of shims can be designed and adjusted according to the difference between the installation height and the current height.

[0038] c. Align the embedded extended nut 5 of the circular precast column 3 with the bolt installation hole 7 of the stainless steel circular hoop 6, and tighten and fix it with a 10.8-grade extended bolt.

[0039] d. After the circular precast column 3 and the stainless steel circular hoop 6 are fixed, install a fastener 12 and a rail 13 on the top of the circular precast column 3. A fastener bolt sleeve 11 is embedded on the top surface of the circular precast column 3, and the rail 13 is fastened by fixing the fastener 12 to the fastener bolt sleeve 11.

[0040] Since the circular precast column 3 and the stainless steel circular hoop 6 are connected by extended bolts, the disassembly and installation are both relatively convenient, which is convenient for the installation and maintenance of the track line.

[0041] In summary, in this embodiment, the circular precast column and the stainless steel circular hoop are connected by bolts. While ensuring a reliable connection, it is also convenient for disassembly and installation, which can effectively improve the construction efficiency, shorten the construction time, and save costs.

[0042] Although the above embodiments have detailed the concept and embodiments of the present invention with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims. Therefore, they will not be elaborated one by one here.

Claims

1. A circular precast column structure for inspection pit, characterized in that: It includes a circular precast column installed in a reserved installation groove of a cast-in-place foundation. The shape, size, and depth of the reserved installation groove all meet the installation requirements of the circular precast column. The circular precast column includes a steel mesh, several embedded extended nuts arranged along the circumference of the steel mesh, and concrete wrapped around the outer side of the embedded extended nuts and the steel mesh. A stainless-steel circular hoop is embedded at the notch of the reserved installation groove. The shape and size of the stainless-steel circular hoop are adapted to the shape and size of the circular precast column. The stainless-steel circular hoop is provided with several bolt installation holes along its circumference. The arrangement position, quantity, shape, and size of the bolt installation holes of the stainless-steel circular hoop are adapted to the arrangement position, quantity, shape, and size of the embedded extended nuts of the circular precast column. The circular precast column and the stainless-steel circular hoop are connected by the cooperation of extended bolts with the bolt installation holes and the embedded extended nuts; Several U-shaped steel bars are welded along the circumference of the stainless-steel circular hoop. The U-shaped steel bars are connected to the steel reinforcement of the cast-in-place foundation; the bolt installation holes of the stainless-steel circular hoop are oval; The embedded extended nuts are welded to the steel mesh through the nut welding steel bars on them, and the nut welding steel bars are welded through the nut-to-nut welding steel bars; The top of the circular precast column is provided with a rail bottom slope and embedded with a fastener bolt sleeve; Using the designed positions of the bolt installation holes and the embedded extended nuts to ensure the consistency of the rail bottom slopes of each circular precast column; When installing the circular precast column, first embed the stainless-steel circular hoop at the notch of the reserved installation groove, and then hoist the circular precast column into the reserved installation groove.

2. An installation method for the circular precast column structure for inspection pit according to claim 1, characterized in that: The installation method includes the following steps: a. Set a reserved installation groove through the cast-in-place foundation and embed the stainless-steel circular hoop, and hoist and install the circular precast column into the reserved installation groove of the cast-in-place foundation; b. Adjust the installation height of the circular precast column. When the height is insufficient, adjust its height by setting adjustment pads under the circular precast column until the installation height requirement is met; c. Align the embedded extended nuts of the circular precast column with the bolt installation holes of the stainless-steel circular hoop, and tighten and fix them with extended bolts; d. After the circular precast column and the stainless-steel circular hoop are fixed, install fasteners and rails on the top of the circular precast column; the fasteners are installed and fixed by embedding fastener bolt sleeves at the top end of the circular precast column.

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