Subway station foundation pit water-collecting well formwork installation method

Abstract

The invention discloses a subway station foundation pit water-collecting well template mounting method, which belongs to the technical field of water-collecting well construction, and comprises the following specific steps: splicing wood rubber plates into large and small boxes of a water-collecting well, fixing the inner sides of the boxes by using square timbers, and performing inner support by using a bowl buckle type steel pipe bracket after the square timbers are fixed; and finally, the water collecting well formwork is integrally installed on the ground and hoisted into the water collecting pit, after excavation of the water collecting pit is completed, construction is adopted for integrally hoisting the formwork, steel pipes are used for supporting the interior, after the strength of a concrete cushion reaches the design requirement, internal supports of the formwork are removed, and follow-up steel bar binding work is conducted. According to the method, the water collecting well formwork is integrally installed on the ground and hoisted into the sump through a reasonable construction technology, the construction production period is short, a large amount of construction time is saved, the construction quality is guaranteed, the overall exposure time of the sump is shortened due to overall installation of the ground formwork, the construction safety is greatly improved, and the construction cost is reduced. The method has good social benefits and economical efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of water collection well construction, and more specifically relates to a method for installing a water collection well template in a foundation pit of a subway station. Background Art

[0002] The subway sump is used to collect and store rainwater that leaks into the station from the entrances and exits, as well as water from the toilets and fire-fighting systems inside the station. The general function of the sump is to collect rainwater, domestic water or fire-fighting water. The sump is a key process in the construction of subway foundation pits. Due to the abundant groundwater sources, groundwater seeps out along the slope surface, slope foot or pit during the construction of the sump, making the pit soften or muddy. When the excavation depth of the foundation pit is large, if the soil composition is fine, under the action of the groundwater dynamic pressure, it may also cause sand flow, pipe gushing, pit bottom uplift and slope instability. And during the construction of the sump, the overall exposure time of the sump is too long, which greatly affects the safety of the construction. Therefore, how to provide an efficient and safe method for installing the template of the subway station foundation pit sump is a problem that technicians in this field urgently need to solve. Summary of the invention

[0003] Under the current tight schedule for domestic subway construction, in order to solve the problems of wasting time, low efficiency, difficulty in ensuring the size of the construction structure, being unfavorable for the organization of flow operation construction, and long construction period in the construction of water collection pits, the present invention provides a new water collection pit template construction technology. This method uses a reasonable construction process to install the water collection pit template on the ground as a whole and then hoist it into the water collection pit. The construction production cycle is short, a large amount of construction time is saved, the construction quality is guaranteed, and the overall installation of the ground template reduces the overall exposure time of the water collection pit, greatly enhances the construction safety, and has good social benefits and economic efficiency.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for installing a template for a water collection well in a foundation pit of a subway station comprises the following steps:

[0006] S1: Use wood glue boards to first splice into a coverless cylinder to form a water collection well template, and its length and width dimensions are adapted to the size of the water collection well;

[0007] S2: Each of the five sides of the inner wall of the cylinder is fixedly connected to a number of square timbers, which are evenly spaced and horizontally arranged;

[0008] S3: The relative square timbers are connected with steel pipe supports through adjustable drag braces, and the steel pipes are connected to each other to form a crisscross three-dimensional support frame;

[0009] S4: The top of the cylinder is capped with a wood plywood with square wood fixed on the bottom. The square wood on the top of the cylinder and the square wood on the bottom of the cylinder are supported oppositely by adjustable drag braces and steel pipes;

[0010] S5: After the excavation of the sump is completed, the sump template is hoisted into the sump, and concrete is poured on the outside of the sump template;

[0011] S6: After the strength of the concrete cushion layer reaches the design requirements, the internal three-dimensional support frame and cylinder of the water collection well formwork are removed to carry out subsequent steel bar binding work.

[0012] Furthermore, four square timbers are fixedly connected to each side of the inner wall of the cylinder.

[0013] Furthermore, both ends of the X-direction steel pipe are threadedly connected to one end of the adjustable support, and the other end of the adjustable support is buckled with the square wood on the X side through a U-shaped connector, and two oppositely arranged square woods are fixed to the X-direction width of the cylinder through the adjustable support and the X-direction steel pipe top support; both ends of the Y-direction steel pipe are threadedly connected to one end of the adjustable support, and the other end of the adjustable support is buckled with the square wood on the Y side through a U-shaped connector, and two oppositely arranged square woods are fixed to the Y-direction width of the cylinder through the adjustable support and the Y-direction steel pipe top support; both ends of the Z-direction steel pipe are threadedly connected to one end of the adjustable support, and the other end of the adjustable support at the lower end of the Z-direction steel pipe is buckled with the square wood on the Z side through a U-shaped connector, and the four groups of adjustable supports at the upper end of the Z-direction steel pipe are all adjusted to the same height and adapted to the height of the side wall of the cylinder; the X-direction steel pipe, the Y-direction steel pipe and the Z-direction steel pipe are connected to each other to form a three-dimensional support frame.

[0014] Furthermore, the steel pipe is a bowl-shaped steel pipe of φ48.3mm×3.5mm.

[0015] Furthermore, the water collection well formwork construction adopts the hanging formwork technology.

[0016] The beneficial effects of the present invention are:

[0017] The present invention solves the problems of wasting time, low efficiency, difficulty in ensuring the size of the construction structure, being unfavorable for the organization of flow operation construction, and long construction period in the construction of a water collection well. This method uses a reasonable construction process to install the water collection well template on the ground as a whole and then hoist it into the water collection pit. The construction production cycle is short, a large amount of construction time is saved, the construction quality is guaranteed, and the overall installation of the ground template reduces the overall exposure time of the water collection pit, greatly enhances the construction safety, and has good social benefits and economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1It is a schematic structural diagram of the cylinder of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal structure of the cylinder of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the three-dimensional support frame of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the present invention when the mold is hung.

[0023] Among them, in the figure:

[0024] 1- cylinder; 2- square wood; 3- three-dimensional support frame; 4- adjustable support. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please see attached Figure 1-4 The present invention provides a method for installing a template for a water collection well in a foundation pit of a subway station, comprising the following steps:

[0027] S1: Use 15mm thick wood glue board to first splice into a coverless cylinder 1 to form a water collection well template, and its length and width dimensions are adapted to the size of the water collection well;

[0028] S2: A plurality of square timbers 2 are fixedly connected to each of the five inner surfaces of the cylinder 1, and the square timbers 2 are arranged horizontally at equal intervals;

[0029] In one embodiment of the present invention, four square timbers 2 are fixedly connected to each side of the inner wall of the cylinder 1, and the size of the square timber 2 is 80*80 mm.

[0030] S3: The relative square timbers 2 are connected to the steel pipe supports through adjustable dragging braces 4, and the steel pipes are connected to each other to form a crisscross three-dimensional support frame 3;

[0031] In one embodiment of the present invention, the two ends of the X-direction steel pipe are threadedly connected to one end of the adjustable brace 4, and the other end of the adjustable brace 4 is buckled with the square wood 2 on the X side through a U-shaped connector. The two oppositely arranged square woods 2 are supported by the adjustable brace 4 and the X-direction steel pipe to fix the X-direction width of the cylinder 1. The two ends of the Y-direction steel pipe are threadedly connected to one end of the adjustable brace 4, and the other end of the adjustable brace 4 is buckled with the square wood 2 on the Y side through a U-shaped connector. The two oppositely arranged square woods 2 are supported by the adjustable brace 4 and the Y-direction steel pipe to fix the Y-direction width of the cylinder 1. The two ends of the Z-direction steel pipe are threadedly connected to one end of the adjustable brace 4, and the other end of the adjustable brace 4 at the lower end of the Z-direction steel pipe is buckled with the square wood 2 on the Z side through a U-shaped connector. The four groups of adjustable braces 4 at the upper end of the Z-direction steel pipe are all adjusted to the same height and adapted to the height of the side wall of the cylinder 1. The X-direction steel pipe, the Y-direction steel pipe and the Z-direction steel pipe are connected to each other to form a three-dimensional support frame 3.

[0032] In one embodiment of the present invention, the steel pipe is a cup-shaped steel pipe with a diameter of 48.3 mm × 3.5 mm.

[0033] S4: The top of the cylinder 1 is capped with a wood plywood with a square wood 2 fixed on the bottom surface. The square wood 2 on the top of the cylinder 1 and the square wood 2 on the bottom of the cylinder 1 are supported oppositely by the steel pipe through the adjustable drag support 4; the square wood 2 on the top is embedded in the U-shaped connector of the adjustable drag support 4, and is supported oppositely by the square wood 2 at the Z-down end;

[0034] S5: After the excavation of the sump is completed, the sump template is hoisted into the sump, and concrete is poured on the outside of the sump template;

[0035] In one embodiment of the present invention, in order to ensure the overall structural size of the water collection well and prevent the deformation of the cushion layer due to groundwater after the cushion layer is poured, resulting in changes in the structural size, the water collection well formwork construction is required to adopt a hanging formwork process.

[0036] S6: After the strength of the concrete cushion reaches the design requirements, the three-dimensional support frame 3 and the cylinder 1 inside the water collection well formwork are removed, and subsequent steel bar binding work is carried out.

[0037] The present invention provides a method for installing a template for a water collection well in a foundation pit of a subway station. The overall installation process of the outer template of the water collection well is improved. 15mm wood plywood is used to splice into a water collection well size box. The inside of the box is fixed with square wood. After the square wood is fixed, a bowl-shaped steel pipe bracket is used for internal support. Finally, the template of the water collection well is hoisted into the water collection pit after the overall installation is completed on the ground. After the excavation of the water collection pit is completed, in order to ensure the overall structural size of the water collection well and prevent the deformation of the cushion layer caused by groundwater after the cushion layer is poured, the design requires the construction of an overall hanging template. After the strength of the concrete cushion layer reaches the design requirements, the internal support of the template is removed, and the subsequent steel bar binding work is carried out. It not only solves the problems of long construction cycle and low efficiency of the water collection well, but also ensures the construction size of the water collection well and the construction quality.

[0038] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for installing a template for a water collection well in a foundation pit of a subway station, characterized in that: The steps include: S1: Use wood glue boards to first splice into a coverless cylinder (1) to form a water collection well template, the length and width of which are adapted to the size of the water collection well; S2: A plurality of square timbers (2) are fixedly connected to each of the five inner surfaces of the cylinder (1), and the square timbers (2) are arranged horizontally at equal intervals; S3: The relative square timbers (2) are connected to each other through adjustable drag braces (4) and steel pipe supports, and the steel pipes are connected to each other to form a crisscross three-dimensional support frame (3); S4: The top of the cylinder (1) is capped with a wood plywood with a square wood (2) fixed on the bottom surface, and the square wood (2) at the top of the cylinder (1) and the square wood (2) at the bottom of the cylinder (1) are supported oppositely by an adjustable drag brace (4) and a steel pipe; S5: After the excavation of the sump is completed, the sump template is hoisted into the sump, and concrete is poured on the outside of the sump template; S6: After the strength of the concrete cushion layer reaches the design requirements, the three-dimensional support frame (3) and the cylinder (1) inside the water collection well template are removed, and the subsequent steel bar binding work is carried out.

2. The method for installing a template for a water collection well in a foundation pit of a subway station according to claim 1, characterized in that: Four square timbers (2) are fixedly connected to each side of the inner wall of the cylinder (1).

3. The method for installing a template for a water collection well in a foundation pit of a subway station according to claim 1, characterized in that: The two ends of the X-direction steel pipe are threadedly connected to one end of the adjustable drag support (4), and the other end of the adjustable drag support (4) is buckled to the square wood (2) on the X side through a U-shaped connecting piece. The two square woods (2) arranged opposite to each other are fixed to the X-direction width of the cylinder (1) through the adjustable drag support (4) and the X-direction steel pipe top support; the two ends of the Y-direction steel pipe are threadedly connected to one end of the adjustable drag support (4), and the other end of the adjustable drag support (4) is buckled to the square wood (2) on the Y side through a U-shaped connecting piece. The two square woods (2) arranged opposite to each other are fixed to the X-direction width of the cylinder (1) through the adjustable drag support (4) and the X-direction steel pipe top support. The adjustable drag support (4) and the Y-direction steel pipe top support fix the Y-direction width of the cylinder (1); the two ends of the Z-direction steel pipe are threadedly connected to one end of the adjustable drag support (4); the other end of the adjustable drag support (4) at the lower end of the Z-direction steel pipe is buckled with the square wood (2) on the Z side through a U-shaped connecting piece; the four groups of adjustable drag supports (4) at the upper end of the Z-direction steel pipe are all adjusted to the same height and are adapted to the height of the side wall of the cylinder (1); the X-direction steel pipe, the Y-direction steel pipe and the Z-direction steel pipe are connected to each other to form a three-dimensional support frame (3).

4. The method for installing a template for a water collection well in a foundation pit of a subway station according to claim 3, characterized in that: The steel pipe used is bowl-shaped steel pipe φ48.3mm×3.5mm.

5. The method for installing a template for a water collection well in a foundation pit of a subway station according to claim 1, characterized in that: The water collection well formwork construction adopts the hanging formwork technology.

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