A construction method of a U-shaped reinforcement cage in underground comprehensive pipe gallery construction

Abstract

The application provides a construction method of a U-shaped reinforcement cage in underground comprehensive pipe gallery construction and relates to the technical field of pipe gallery construction.The construction method of the U-shaped reinforcement cage comprises the following steps: step one, selecting multiple prefabricated U-shaped reinforcement cage units according to the size of a pipe gallery foundation pit;step two, selecting one U-shaped reinforcement cage unit and hoisting the unit to a cushion layer in the pipe gallery foundation pit, so that the center line of the U-shaped reinforcement cage unit is aligned with the center line of the pipe gallery foundation pit;step three, after fixing and installing outer molds on the two sides of the U-shaped reinforcement cage unit, adjusting the U-shaped reinforcement cage unit to a to-be-constructed position;step four, installing a horizontal pull beam connecting the two top portions of the two outer molds; and step five, sequentially hoisting the remaining multiple U-shaped reinforcement cage units into the pipe gallery foundation pit for sequential splicing.The application realizes the rapid construction of the reinforcement cage in the pipe gallery foundation pit, and the modular construction method is more efficient than the traditional temporary construction method.

Description

Technical Field

[0001] This invention relates to the field of utility tunnel construction technology, and more specifically, to a construction method for a U-shaped steel cage in the construction of an underground integrated utility tunnel. Background Technology

[0002] Integrated utility tunnels are underground urban pipeline corridors. They are tunnel spaces built underground in cities to integrate various engineering pipelines such as electricity, communications, gas, heating, water supply and drainage. They are equipped with dedicated maintenance ports, hoisting ports and monitoring systems, and are subject to unified planning, design, construction and management. They are important infrastructure and "lifelines" to ensure the operation of cities.

[0003] When constructing the utility tunnel, a steel cage needs to be erected in the pre-excavated foundation pit. The steel cage is laid along the extension direction of the foundation pit and has a U-shaped structure. Existing U-shaped steel cages need to be temporarily erected in the foundation pit, using different steel bars arranged in an alternating pattern, which results in low construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for U-shaped steel cages in the construction of underground integrated utility tunnels, which enables the rapid erection of steel cages in the tunnel foundation pit. Compared with the traditional temporary erection method, the modular erection method improves efficiency.

[0005] The technical solution of this invention is implemented as follows:

[0006] This application provides a construction method for U-shaped steel reinforcement cages in the construction of underground integrated utility tunnels, including the following steps:

[0007] Step 1: Select multiple prefabricated U-shaped steel cage units based on the dimensions of the utility tunnel foundation pit;

[0008] Step 2: Select a U-shaped steel cage unit and hoist it onto the foundation layer in the pipe gallery pit, aligning the centerline of the U-shaped steel cage unit with the centerline of the pipe gallery pit.

[0009] Step 3: After fixing and installing the outer mold on both sides of the U-shaped steel cage unit, adjust the U-shaped steel cage unit to the position to be constructed.

[0010] Step 4: Install the crossbeams connecting the two outer molds on top;

[0011] Step 5: The remaining U-shaped steel cage units are hoisted sequentially to the pipe gallery foundation pit for sequential splicing.

[0012] In some embodiments of the present invention, the position of the U-shaped steel cage unit in step three is adjusted using a moving positioning device.

[0013] In some embodiments of the present invention, in step five, adjacent U-shaped steel cages are pulled closer by hydraulic cylinders, and the adjacent U-shaped steel cages are overlapped.

[0014] In some embodiments of the present invention, the pipe gallery foundation pit has a sunken section, which includes two horizontal sections and a sloping section;

[0015] U-shaped steel cages were hoisted into the two horizontal sections and the sloping section respectively, and gaps were formed between adjacent U-shaped steel cages for filling and reinforcement.

[0016] In some embodiments of the present invention, filling steel bars are inserted into the gap, and the two ends of the filling steel bars are respectively lapped with the U-shaped steel cage on the same side.

[0017] Compared with the prior art, the technical solution of the present invention has at least the following advantages or beneficial effects:

[0018] (1) The present invention is based on the sequential hoisting of prefabricated U-shaped steel cage units to the pipe gallery foundation pit to splice them into a complete U-shaped steel cage, which realizes the rapid construction of steel cages in the pipe gallery foundation pit. Compared with the traditional temporary construction method, the modular construction method improves efficiency.

[0019] (2) For the sinking section of the pipe gallery foundation pit, the filling and reinforcement method is adopted to achieve stable connection of the U-shaped steel cage in the horizontal section and the sloping section, and realize the rapid arrangement of the steel cage in the sinking section of the pipe gallery foundation pit. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a construction diagram illustrating steps one and two of a construction method for a U-shaped steel cage in the construction of an underground integrated utility tunnel according to an embodiment of the present invention.

[0022] Figure 2 This is a construction illustration of step three in a construction method for a U-shaped steel reinforcement cage in the construction of an underground integrated utility tunnel according to an embodiment of the present invention. Figure 1 ;

[0023] Figure 3 This is a construction illustration of step three in a construction method for a U-shaped steel reinforcement cage in the construction of an underground integrated utility tunnel according to an embodiment of the present invention. Figure 2 ;

[0024] Figure 4This is a construction diagram illustrating the dismantling of the moving positioning device and the hoisting equipment for the U-shaped steel cage unit in a construction method for an underground integrated pipe gallery according to an embodiment of the present invention.

[0025] Figure 5 This is a construction diagram illustrating step four of a construction method for a U-shaped steel cage in the construction of an underground integrated utility tunnel according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the connection structure between adjacent U-shaped steel cages in a construction method for U-shaped steel cages in the construction of an underground integrated pipe gallery according to an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the connection between adjacent U-shaped steel cages in the sinking section of a construction method for U-shaped steel cages in the construction of an underground integrated pipe gallery according to an embodiment of the present invention.

[0028] Icons: 1-Pipe gallery bedding layer, 2-U-shaped steel cage unit, 3-Outer mold, 4-Moving positioning device, 5-Hydraulic cylinder, 6-Filling steel reinforcement. Detailed Implementation

[0029] Example

[0030] Please refer to Figures 1-7 A construction method for U-shaped steel cages in the construction of underground utility tunnels includes the following steps:

[0031] Step 1: Select multiple prefabricated U-shaped steel cage units 2 based on the dimensions of the utility tunnel foundation pit;

[0032] The utility tunnel foundation pit is constructed using a slope excavation method, which has the advantages of low cost and fast support construction speed. During the excavation stage of the utility tunnel foundation pit, necessary surface drainage systems such as open ditches, blind ditches, and sump pits, as well as an internal drainage system, should be set up.

[0033] For the formation of U-shaped rebar cage unit 2, firstly, a rebar cage installation platform is built, and the bottom plate rebar unit is installed on the platform. Secondly, vertical positioning frames are installed on the rebar cage installation platforms on both sides of the bottom plate rebar unit, with the vertical positioning frames close to the bottom plate rebar. Side wall rebar units are installed on the inner sides of both vertical positioning frames, and the side wall rebar units are connected to the vertical positioning frames. Finally, the middle wall rebar unit is installed on the bottom plate rebar unit between the two side beam rebar units. (The bottom plate rebar unit, side wall rebar unit, and middle wall rebar unit are all prefabricated rectangular rebar cages with different sizes. In actual use, the corresponding size module can be selected for construction, which has the advantage of fast construction efficiency.) This forming method realizes the modular construction of U-shaped rebar cages, greatly improving the construction speed.

[0034] Step 2: Select a U-shaped steel cage unit 2 and hoist it onto the cushion layer in the pipe gallery foundation pit, aligning the center line of the U-shaped steel cage unit 2 with the center line of the pipe gallery foundation pit;

[0035] The foundation layer is cast in place and is located at the bottom center of the pipe gallery foundation pit. Before the foundation layer is constructed, two positioning and tensioning devices for connecting the box-shaped outer formwork are pre-embedded in sections at the bottom of the pipe gallery foundation pit, and a positioning pile for the outer diameter of the pipe gallery is implanted inside any of the positioning and tensioning devices.

[0036] Step 3: After fixing and installing the outer mold 3 on both sides of the U-shaped steel cage unit 2, adjust the U-shaped steel cage unit 2 to the position to be constructed.

[0037] The outer mold 3 is connected to two positioning and tensioning devices, which are two horizontally arranged adjusting bolts. The position of the outer mold 3 is fixed by the positioning of the two adjusting bolts. The positioning and tensioning device can enable the outer mold 3 to be quickly positioned on the pipe gallery cushion layer 1.

[0038] Step 4: Install the crossbeams connecting the two outer molds 3 on their tops;

[0039] The crossbeam and the two outer molds 3 are detachably connected by bolts, which enables quick connection or disassembly between the outer molds 3 and the crossbeam.

[0040] Step 5: The remaining U-shaped steel cage units 2 are hoisted sequentially to the pipe gallery foundation pit for sequential splicing.

[0041] The multi-segment U-shaped steel cage unit 2 is arranged sequentially along the extension direction of the pipe gallery foundation pit, and the adjacent U-shaped steel cages are connected end to end, which improves the structural stability of the multi-segment U-shaped steel cage unit 2 connected to the overall steel cage.

[0042] This invention is based on the sequential hoisting of prefabricated U-shaped steel cage units 2 into the pipe gallery foundation pit to form a complete U-shaped steel cage, realizing the rapid construction of steel cages in the pipe gallery foundation pit. Compared with the traditional temporary construction method, the modular construction method improves efficiency.

[0043] In some embodiments of the present invention, the position of the U-shaped steel cage unit 2 in step three is adjusted by a moving positioning device 4.

[0044] In the above embodiment, the U-shaped rebar cage unit 2 is connected to the mobile positioning device 4, facilitating autonomous adjustment of the position of the U-shaped rebar cage unit 2. The mobile positioning device 4 has two guide rails, on which a support structure is slidably mounted. This support structure is used to connect the U-shaped rebar cage unit.

[0045] After the first U-shaped steel cage unit 2 is installed, the moving positioning device 4 and the hoisting tools for the U-shaped steel cage unit 2 are removed before the next U-shaped steel cage unit 2 is installed.

[0046] In some embodiments of the present invention, in step five, adjacent U-shaped steel cages are pulled closer by hydraulic cylinder 5, and the adjacent U-shaped steel cages are overlapped.

[0047] In the above embodiment, the U-shaped steel cage is pulled by the hydraulic cylinder 5, which makes the movement of the U-shaped steel cage more sensitive and easier to adjust its position.

[0048] In practical applications, two hydraulic cylinders 5 are used, which are distributed on both sides of the U-shaped steel cage to achieve bidirectional pulling of the U-shaped steel cage, resulting in a better pulling effect.

[0049] In some embodiments of the present invention, the pipe gallery foundation pit has a sunken section, which includes two horizontal sections and a sloping section;

[0050] U-shaped steel cages were hoisted into the two horizontal sections and the sloping section respectively, and gaps were formed between adjacent U-shaped steel cages for filling and reinforcement.

[0051] In the above embodiments, for the sinking section of the pipe gallery foundation pit, a filling and reinforcement method is adopted to achieve a stable connection between the horizontal section and the sloping section U-shaped steel cage, thereby realizing the rapid arrangement of the steel cage in the sinking section of the pipe gallery foundation pit.

[0052] In some embodiments of the present invention, a filling steel bar 6 is inserted into the gap, and the two ends of the filling steel bar 6 are respectively lapped with the U-shaped steel cage on the same side.

[0053] In the above embodiment, the U-shaped steel cage has multiple layers. For adjacent U-shaped steel cages, the multiple layers of steel bars are respectively inserted with filling steel bars 6 to enhance the connection stability between adjacent U-shaped steel cages, thereby improving the overall structural stability of the steel cage.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for a U-shaped steel reinforcement cage in the construction of an underground integrated pipe gallery, characterized in that, Includes the following steps: Step 1: Select multiple prefabricated U-shaped steel cage units based on the dimensions of the utility tunnel foundation pit. For the formation of the U-shaped steel cage units, firstly, build a steel cage installation platform and install the bottom plate steel cage units on the platform. Secondly, install vertical positioning frames on the steel cage installation platforms on both sides of the bottom plate steel cage units, and ensure that the vertical positioning frames are close to the bottom plate steel cages. Install side wall steel cage units on the inner sides of both vertical positioning frames and connect the side wall steel cage units to the vertical positioning frames. Finally, install the middle wall steel cage units on the bottom plate steel cage units between the two side beam steel cage units. Step 2: Select a U-shaped steel cage unit and hoist it onto the foundation layer in the pipe gallery pit, aligning the centerline of the U-shaped steel cage unit with the centerline of the pipe gallery pit. Step 3: After fixing and installing the outer mold on both sides of the U-shaped steel cage unit, adjust the U-shaped steel cage unit to the position to be constructed. Step 4: Install the crossbeams connecting the two outer molds on top; Step 5: The remaining U-shaped steel cage units are hoisted sequentially to the pipe gallery foundation pit for sequential splicing. The pipe gallery foundation pit has a sinking section, which includes two horizontal sections and a sloping section. U-shaped steel cages are hoisted into the two horizontal sections and the sloping section respectively, and a filling gap is formed between adjacent U-shaped steel cages. The filling gap is filled and reinforced. Filling steel bars are inserted into the filling gap, and the two ends of the filling steel bars are respectively connected to the U-shaped steel cages on the same side.

2. The construction method of U-shaped steel cage in the construction of an underground integrated pipe gallery according to claim 1, characterized in that, In step three, the position of the U-shaped steel cage unit is adjusted using a moving positioning device.

3. The construction method of U-shaped steel cage in the construction of an underground integrated pipe gallery according to claim 2, characterized in that, In step five, adjacent U-shaped steel cages are pulled closer together using hydraulic cylinders, and the adjacent U-shaped steel cages are overlapped and matched.

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