A precast and assembled column-type inspection pit structure for a subway and its construction method

Abstract

The present invention belongs to the technical field of urban rail transit, and specifically provides a prefabricated and assembled column-type inspection pit structure and construction method for a subway, including short sleeper blocks, prefabricated columns and fasteners. A plurality of prefabricated columns are arranged at intervals along the extending direction of the rail. The short sleeper blocks are filled in the foundation pits on both sides of the inspection pit. A plurality of short sleeper blocks are connected to the rail in sequence at a preset spacing through fasteners to form a track panel; the track panel is hoisted and roughly laid in the foundation pits on both sides of the inspection pit, the steel reinforcement cage around the track panel is tied and the formwork is erected; the geometric position state of the short sleeper blocks is adjusted to adjust the rail to a preset state, and then concrete is poured to fix the short sleeper blocks and the foundation pit into a whole; after the concrete strength reaches the preset condition, the formwork is removed, the fasteners and the rail are removed, and the prefabricated columns are installed on the short sleeper blocks; the rail is installed at the top of the prefabricated column through fasteners. The construction efficiency and quality are improved, the construction period is shortened, and the labor intensity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of urban rail transit, and particularly relates to a precast assembled column type inspection pit structure and construction method for a subway. Background Technique

[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 rapid development of subway construction in each city, vehicle depot maintenance bases related to subways are also being constructed in large quantities. Vehicle comprehensive maintenance bases are mainly divided into two categories according to different usage functions, namely vehicle depots and parking lots, which are used for vehicle maintenance and parking, and the individual names are operation depots and maintenance depots. There are multiple inspection trenches in the depot, and each inspection trench is provided with a large number of columns, which play roles such as supporting the track, bearing the train load, and providing an inspection space. Such an inspection trench is generally also called a column type inspection pit, and mainly consists of an inspection pit, columns, and tracks.

[0003] Currently, most of the columns in the column type inspection pit sections in vehicle depots and parking lots of subways adopt the form of on-site formwork casting of concrete. Due to reasons such as the track system and the civil engineering system belonging to different bid sections, the column type inspection pit in the depot is completed by two construction units, namely the track and the civil engineering. Generally, the civil engineering unit first constructs the inspection pit and part of the length of the columns, and then the track unit constructs the remaining length of the columns and lays the steel rails on the columns. It is found in on-site construction that the embedded position accuracy of the embedded parts on the columns often cannot meet the requirements of the steel rail laying accuracy, and at the same time, the laying of the rails is likely to cause some corner breaks and damages to the already completed columns. Since the concrete columns have been constructed before the laying of the rails, there are many errors in the horizontal and vertical positioning of the columns, resulting in difficult guarantee of the steel rail installation accuracy and poor positioning accuracy. It is necessary to repair or demolish some columns, and the workload is huge. Due to the column construction being completed in two pours, the consumption of inspection pit columns is large, and the individual units are small, located on both sides of the inspection pit, it is difficult to support the formwork manually, and there are problems such as many construction operation links, difficult control of construction accuracy and quality, large material waste, and long construction period, resulting in increased project costs and low construction efficiency, seriously affecting the overall progress of the project. In addition, in order to increase the inner wall clear distance as much as possible for convenient inspection, but due to the restriction of the rail gauge, it is easy to cause the reserved sleeve or connection hole distance of the top fastener of the current cast-in-place column from the inner wall of the inspection pit to be small, and the concrete thickness of the inner wall is thin, and in subsequent use, diseases such as splitting and cracking are likely to occur.

[0004] The existing patent CN107558313A discloses an invention of an integral construction structure and method for small columns and tracks in a subway inspection pit, and the patent CN107268348A discloses an invention of a construction method for a column - type subway inspection pit. The above patents mainly make corresponding improvements to the column - type inspection pit from the perspective of construction methods, but they are all cast - in - place concrete column - type constructions, which have the disadvantages of low construction efficiency, large amount of wet work, and serious pollution. The existing patent CN209703203U, a utility model, discloses a precast H - shaped plate - column combined track structure for rail transit, and the patent CN209052949U, a utility model, discloses a precast plate - column combined track structure for rail transit. The above patents replace the cast - in - place concrete columns with precast plate - column combined structures, which to a certain extent solve the disadvantages of cast - in - place columns. However, the precast concrete plate - column structure in the patents is relatively heavy, making hoisting, transportation, and construction difficult. The foundation is composed of precast plates and self - compacting concrete, which is costly and uneconomical when applied to subway yard lines. The precast foundation plates are not convenient for walking operations in the inspection pit, and there are also disadvantages such as a large amount of precise adjustment during construction and high requirements for precise adjustment equipment. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems of difficult and inefficient construction of the inspection pit structure in the prior art.

[0006] To this end, the present invention provides a precast and assembled column - type subway inspection pit structure, which includes short sleeper blocks, precast columns, and fasteners. A plurality of the precast columns are arranged at intervals along the extending direction of the rail, and the short sleeper blocks are filled in the foundation pits on both sides of the inspection pit.

[0007] Upper support steel plates and lower support steel plates are respectively welded at both ends of the precast column. The lower support steel plate is bolt - connected to the short sleeper block, and the upper support steel plate is bolt - connected to the fastener. The fastener is provided with a buckle for buckling the rail.

[0008] Preferably, the cross - section of the precast column is a "plus" shape.

[0009] Preferably, the short sleeper block is a concrete structure with a length of 400mm, a width of 400mm, and a height of 200mm.

[0010] Preferably, a concrete protective layer is provided inside the short sleeper block, and vertical steel bars and horizontal steel bars are arranged inside the concrete protective layer.

[0011] Preferably, the structure further includes a bracket arranged perpendicular to the extending direction of the rail. The bracket is a precast concrete structure, and the bracket is bolt - connected to the side wall of the precast column. A steel plate for supporting the rail is welded at the top of the bracket.

[0012] Preferably, an insulating gasket is provided between the fastener and the supporting steel plate, and the insulating gasket is provided with a connection hole for the bolt to penetrate through.

[0013] Preferably, four connection holes are provided on the short sleeper block.

[0014] The present invention also provides a construction method for a prefabricated assembled column-type inspection pit structure of a subway, including the following steps:

[0015] S1: Connect a plurality of short sleeper blocks to the rail in sequence according to a preset spacing through fasteners to form a rail panel;

[0016] S2: Hoist and roughly lay the rail panel into the foundation pits on both sides of the inspection pit, tie the steel reinforcement cages around the rail panel and set up the formwork;

[0017] S3: Adjust the geometric position state of the short sleeper blocks to adjust the rail to a preset state, and then pour concrete to fix the short sleeper blocks and the foundation pit into a whole;

[0018] S4: After the concrete strength reaches the preset conditions, remove the formwork, remove the fasteners and the rail, and install prefabricated columns on the short sleeper blocks;

[0019] S5: Install the rail to the top of the prefabricated column through fasteners.

[0020] Preferably, before the step S5, it further includes: installing a horizontally horizontally extending corbel on the side wall of the prefabricated column, and the top of the corbel abuts against the rail.

[0021] The beneficial effects of the present invention: The prefabricated assembled column-type inspection pit structure and construction method provided by the present invention include short sleeper blocks, prefabricated columns and fasteners. A plurality of prefabricated columns are arranged at intervals along the extension direction of the rail, and the short sleeper blocks are filled in the foundation pits on both sides of the inspection pit. Connect a plurality of short sleeper blocks to the rail in sequence according to a preset spacing through fasteners to form a rail panel; hoist and roughly lay the rail panel into the foundation pits on both sides of the inspection pit, tie the steel reinforcement cages around the rail panel and set up the formwork; adjust the geometric position state of the short sleeper blocks to adjust the rail to a preset state, and then pour concrete to fix the short sleeper blocks and the foundation pit into a whole; after the concrete strength reaches the preset conditions, remove the formwork, remove the fasteners and the rail, and install prefabricated columns on the short sleeper blocks; install the rail to the top of the prefabricated column through fasteners. It realizes the fully prefabricated construction of the column-type inspection pit, improves the construction efficiency and quality, shortens the construction period, and reduces the labor intensity.

[0022] The following will further describe the present invention in detail with reference to the accompanying drawings. Description of the Drawings

[0023] Figure 1It is a three-dimensional schematic diagram of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0024] Figure 2 It is a three-dimensional exploded schematic diagram of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0025] Figure 3 It is a three-dimensional exploded schematic diagram of the contact rail position of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0026] Figure 4 It is a plan schematic diagram of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0027] Figure 5 It is an I-I cross-sectional schematic diagram of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0028] Figure 6 It is a schematic diagram of the precast column structure of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0029] Figure 7 It is a schematic diagram of the precast column structure at the contact rail installation position of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0030] Figure 8 It is a schematic diagram of the corbel structure of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0031] Figure 9 It is a schematic diagram of the short sleeper block of the precast assembled column-type inspection pit structure and construction method of the present invention;

[0032] Figure 10 It is a schematic diagram of the short sleeper row structure of the precast assembled column-type inspection pit structure and construction method of the present invention.

[0033] Explanation of reference numerals: short sleeper block 1, precast column 2, connecting bolt 3, fastening piece 4, rail 5, corbel 6, support steel plate 7, connecting hole 8, connecting steel bar 9, insulating gasket 10. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0036] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] An embodiment of the present invention provides a prefabricated and assembled column-type inspection pit structure for a subway, as Figure 1 to Figure 10 shown, which includes short sleeper blocks 1, precast columns 2 and fasteners 4. A plurality of the precast columns 2 are arranged at intervals along the extending direction of the rail 5, and the short sleeper blocks 1 are filled in the foundation pits on both sides of the inspection pit;

[0038] Upper support steel plates 7 and lower support steel plates 7 are respectively welded to both ends of the precast column 2. The lower support steel plate 7 is bolted to the short sleeper block 1, and the upper support steel plate 7 is bolted to the fastener 4. A buckle for buckling the rail 5 is provided on the fastener 4.

[0039] Among them, the short sleeper block 1 is provided with four connecting holes 8. Two of the diagonal connecting holes are used for the installation of fasteners during the construction of the lower foundation. After the construction of the short sleeper block 1 is completed, the fastener 4 and the rail 5 are removed, and all four connecting holes 8 are used to connect the precast column 2.

[0040] The short sleeper block 1 is pre-connected by the fastener 4 and the rail 5, which is convenient for installation and fine adjustment; the bottom surface of the short sleeper is provided with connecting steel bars 9 to strengthen the connection with the lower foundation. Through the construction and fine adjustment of the short sleeper track structure, the strength and accuracy of the lower support structure meet the requirements for the subsequent installation of the precast column 2. In this example, the short sleeper block is 400 mm long, 400 mm wide, 200 mm high, the diameter of the connecting hole is 48 mm, and the depth is 150 mm.

[0041] The inner side of the short sleeper block 1 is provided with a concrete protective layer thickness of 100 mm, and is provided with upper and lower layers of longitudinal steel bars and transverse stirrups to prevent the concrete on the inner side of the short sleeper block from cracking.

[0042] The precast columns 2 are arranged at intervals along the extending direction of the steel rails 5. The precast column 2 is a cross-shaped steel structure prefabricated in the factory with support steel plates 7 at both the upper and lower ends. The upper steel plate is connected to the steel rail 5 through fasteners 4, facilitating the operation of installing fasteners and supporting the steel rail. The lower steel plate is connected to the supporting surface of the lower short sleeper block 1 through four connecting bolts 3, facilitating the installation of the connecting bolts 3 and providing a supporting plane. The main structures are connected through the connecting bolts 3, avoiding the problem of wet joints during the construction process. In this example, the support steel plates at both the upper and lower ends of the precast column are 400 mm long, 400 mm wide, and 20 mm thick, with a corresponding connecting hole diameter of 48 mm, and the column is 1000 mm long. Among them, the support steel plate 7 is connected to the precast column body (concrete structure) by welding.

[0043] The corbel 6 is a precast steel structure with a support steel plate, and is connected to the cross-shaped steel plate of part of the precast column through the connecting bolt 3, playing the role of supporting the contact rail to adapt to the situation of using contact rail power supply in the subway.

[0044] The steel rail 5 is connected to the support steel plate on the top surface of the precast column 2 through the fastener 4, and an insulating gasket 10 is provided at the bottom of the fastener to meet the insulation requirements of the line and also play a role in fine adjustment.

[0045] The construction steps of this example are as follows:

[0046] Step 1: The civil engineering construction unit hands over the site to the track construction unit;

[0047] Step 2: The short sleeper blocks 1 are pre-connected to the steel rails 5 through the fasteners 4 in advance, assembled into a track panel, and hoisted and roughly laid at the construction positions on both sides of the inspection pit;

[0048] Step 3: Bind the steel bars around the track panel to form a steel bar cage and set up the formwork;

[0049] Step 4: Fine-tune the geometric position of the steel rail in the short sleeper track structure, and reflect the geometric position of the short sleeper block 1 through the geometric position of the steel rail 5, so that the accuracy of the short sleeper block 1 track structure meets the laying requirements;

[0050] Step 5: Pour the concrete;

[0051] Step 6: After the concrete reaches a certain strength, remove the formwork and remove the fasteners 4 and the steel rails 5 on the short sleeper blocks 1;

[0052] Step 7: After completing the construction of the lower foundation short sleeper support structure, install the precast columns 2 without connecting holes at the general positions onto the short sleeper blocks according to the fastener spacing through the connecting bolts 3; install the contact rail columns 2 with connecting holes onto the short sleeper blocks 1 at certain intervals through the connecting bolts 3;

[0053] Step 8: Install the corbel 6 onto the contact rail column 2 with connection holes 8 through the connecting bolts 3; the corbel 6 is connected to the contact rail column 2 through the connecting bolts 3, and the position of the contact rail support can be flexibly replaced and arranged according to the actual construction conditions on site.

[0054] Step 9: Install the fasteners 4 and the rail 5, and finally finely adjust the track structure, finely adjust and fix the gauge, level, elevation and direction of the track structure, further eliminate construction errors and correct the accuracy, so that the rail surface meets the line accuracy requirements and complete the construction.

[0055] The rail 5 and the fasteners 4 removed after the installation and fine adjustment of the short sleeper blocks 1 in Steps 1-6 can be used for the installation of the rail 5 and the fasteners 4 on the precast column 2 in Step 9.

[0056] The fine adjustment of the track structure in Step 5 is mainly carried out by adjusting the insulating gasket 10 at the bottom of the fastener.

[0057] The beneficial effects of this patent are as follows:

[0058] A subway precast assembled column type inspection pit structure and construction method, through the construction and fine adjustment of the short sleeper track structure, the lower support structure of the precast column meets the strength and accuracy requirements; the precast column is connected to the lower short sleeper through the connecting bolt, and finally the fasteners and the rail are installed, realizing the full prefabricated construction of the column type inspection pit, improving the construction efficiency and quality, shortening the construction period, reducing the labor intensity, and well solving the problems of poor construction quality, slow construction speed and large labor intensity existing in the cast-in-place column.

[0059] By installing short sleepers on the lower foundation, the strength and durability of the lower support structure are improved; the geometric position of the short sleeper block is finely adjusted, and the geometric position of the short sleeper is reflected through the geometric position of the rail, ensuring the accuracy of the lower support structure of the precast column and improving the construction accuracy of the whole process; and due to the use of short sleeper blocks, the overall cost is low, the weight is light, and it is convenient for transportation and installation.

[0060] The corbel is connected to the contact rail column through the connecting bolt to support the contact rail, and the position of the contact rail support can be flexibly replaced and arranged according to the actual construction conditions on site, avoiding the problem of removing some columns due to the installation error of the contact rail column caused by construction problems, thus bringing a huge workload.

[0061] The columns of the important support structure are prefabricated in the factory and can be directly installed and fixed on the construction site and put into use. The construction quality is good, the accuracy is guaranteed, the structure is simple, the loading and unloading is convenient, and the operability is strong. It can greatly improve the construction speed, save the construction cost, avoid resource waste, and also enhance the overall aesthetics.

[0062] The above examples are only illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any design identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. Construction method for prefabricated assembled column - type inspection pit structure of subway Characterized in that The prefabricated assembled column - type inspection pit structure of subway includes short sleeper blocks, prefabricated columns and fasteners. A plurality of the prefabricated columns are arranged at intervals along the extending direction of the rail. The short sleeper blocks are filled in the foundation pits on both sides of the inspection pit. Upper support steel plates and lower support steel plates are respectively welded at both ends of the prefabricated column. The lower support steel plate is bolt - connected to the short sleeper block, the upper support steel plate is bolt - connected to the fastener, and a buckle for buckling the rail is arranged on the fastener. The construction method for the prefabricated assembled column - type inspection pit structure of subway includes the following steps S1: Connect a plurality of short sleeper blocks to the rail one by one according to a preset spacing through fasteners to form a track panel S2: Hoist and roughly lay the track panel into the foundation pits on both sides of the inspection pit, bind the steel reinforcement cage around the track panel and set up the formwork S3: Adjust the geometric position state of the short sleeper block to adjust the rail to a preset state, and then pour concrete so that the short sleeper block and the foundation pit are fixed as a whole S4: After the concrete strength reaches the preset condition, remove the formwork, remove the fasteners and the rail, and install the prefabricated column on the short sleeper block S5: Install the rail to the top of the prefabricated column through the fastener 2. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that Before step S5, it further includes: installing a horizontally - extending corbel on the side wall of the prefabricated column, and the top of the corbel abuts against the rail 3. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that The cross - section of the prefabricated column is a "plus" shape 4. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that The short sleeper block is a concrete structure with a length of 400 mm, a width of 400 mm and a height of 200 mm 5. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that A concrete protective layer is provided inside the short sleeper block, and vertical steel bars and horizontal steel bars are provided in the concrete protective layer 6. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that The structure further includes a corbel arranged perpendicular to the extending direction of the rail. The corbel is a prefabricated concrete structure. The corbel is bolt - connected to the side wall of the prefabricated column, and a steel plate for supporting the rail is welded at the top of the corbel 7. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that An insulating gasket is provided between the fastener and the support steel plate, and a connection hole for the bolt to penetrate is provided on the insulating gasket 8. The construction method for the prefabricated assembled column - type inspection pit structure of subway according to claim 1 Characterized in that Four connection holes are provided on the short sleeper block

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