CN104564107A - Construction method for pre-positioning water stop belt of setting arc-shaped die of quadratic lining concrete end head - Google Patents

Description

Construction method of back-fixed water-stop belt in the shape-setting arc mold at the end of secondary lining concrete

technical field

The invention relates to the field of tunnel construction, in particular to a method for constructing a back-fixed waterstop of a secondary lining concrete end-shaped arc mold.

Background technique

In the construction of the second lining concrete of each slab in railway and highway tunnels, because the traditional waterstop at the end of the second lining of the tunnel is installed and fixed without using special equipment, the waterstop is not centered, offset, and buried in the second lining after the concrete is poured. If there is too much lining concrete or the entire waterstop is not buried in concrete, the waterstop needs to be reworked after the concrete construction is completed. Improper treatment will inevitably cause water seepage hazards and high post-processing costs; therefore, a precise positioning method is required. The construction method of the water stop at the end of the second lining of the tunnel.

Contents of the invention

In view of this, the technical problem to be solved by the present invention is to provide a construction method capable of accurately positioning the water stop at the end of the second lining of the tunnel.

The purpose of the present invention is achieved like this:

The construction method for setting the arc mold of the end of the secondary lining concrete to fix the water stop provided by the present invention comprises a trolley for the secondary lining and an arc mold for shaping the end of the second lining, and includes the following steps:

S1: welding a steel plate at the end of the secondary lining trolley, the arc of the steel plate matches the arc of the end of the secondary lining trolley;

S2: U-shaped steel hoop spot-welded at the end of the steel plate, one end of the buried rubber waterstop is installed in the U-shaped steel hoop, and the other end is pressed against the steel plate so that it is pre-buried in the next pouring of the secondary lining concrete The internal buried rubber waterstop is isolated from the concrete surface of the poured secondary lining platform;

S3: Use wooden formwork to seal the mold;

S4: After the concrete is poured for the secondary lining, the trolley for the secondary lining is removed to separate the U-shaped steel hoop from the steel plate.

Further, the mold width of the two-lined end shaping arc mold is 18-22cm; a 4-6mm thick steel plate is welded on the end formwork of the two-lined trolley.

Furthermore, the mid-buried rubber waterstop is pre-embedded in the poured secondary lining concrete 14-16cm; the exposed 14-16cm is in the secondary lining concrete to be poured.

Further, the U-shaped steel hoop is a U-shaped hoop of a steel bar with a length of 14-16 cm and a diameter of 5-7 mm.

Further, the following steps are also included: the pouring of the secondary lining concrete is formed through the following steps:

S21: mixing concrete outside the tunnel: mixing concrete outside the tunnel to form concrete in a flow-plastic state;

S22: transporting concrete into the tunnel: transporting the concrete to the place to be poured in the tunnel; the place to be poured is the part where there is a rubber waterstop in the construction joint of the secondary lining of the tunnel;

S23: pouring concrete: pouring concrete at the place to be poured;

S24: Concrete maintenance: maintaining the poured concrete;

S25: mold removal: remove the formwork at the end of the second lining of the tunnel;

S26: Sprinkling and curing: Sprinkling and curing the concrete at the pouring place.

Further, the following steps are also included when pouring concrete:

S231: Waterproof layer application: perform waterproof layer treatment on the formwork at the end of the second lining of the tunnel;

S232: Binding of steel bars: Binding of steel bars to the formwork at the end of the second lining of the tunnel treated with the waterproof layer;

S233: the trolley is in place;

S234: Correcting brush release agent.

The beneficial effect of the present invention is that: the construction method of the secondary lining concrete end shaped arc mold back-fixed waterstop adopted in the present invention can ensure that the buried rubber waterstop can ensure the Buried in the poured secondary lining concrete 15cm, exposed 15cm in the secondary lining concrete to be poured. The shaping arc mold is 20cm wide and adopts 5mm thick steel plate, which is welded on the end formwork of the second lining trolley, with small investment, easy processing, simple construction and operation, and can be popularized in a large area.

At the end of the secondary lining trolley, a 5mm thick steel plate with a width of 20cm is welded circumferentially. Spot weld the U-shaped hoop of Φ6 steel bar with a length of 15cm at the end of the steel plate, install the buried rubber waterstop 15cm in the U-shaped hoop, and press the other end on the 20cm wide steel plate (this can ensure that it is pre-buried in the next The water stop in the second lining concrete is not in contact with the surface of the second lining concrete pouring), and then the traditional 15cm wide and 50-110cm long wooden formwork sealing mold is used. Because the U-shaped hoop is spot-welded on the steel plate, the secondary lining trolley can be removed when it is moved. The construction technology of arc-shaped steel formwork at the end of the secondary lining trolley has guiding significance for embedding rubber waterstops in the secondary lining construction joints of passenger dedicated line tunnels. The construction technology of using arc-shaped steel mold at the end of the secondary lining trolley can ensure that the buried rubber waterstop 15cm is embedded in the poured concrete, and the exposed 15cm is in the concrete to be poured, ensuring the waterstop effect of the waterstop , avoiding the phenomenon of secondary lining rework caused by inaccurate pre-embedding. By adopting this construction method, the construction cost of secondary lining is reduced.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a flow chart of the construction method for the back-fixed waterstop of the concrete end of the secondary lining provided by the embodiment of the present invention.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

As shown in the figure, the construction method of the secondary lining concrete end shaping arc mold returning fixed waterstop provided by the present invention includes the secondary lining trolley and the second lining end shaping arc mold, including the following steps:

S1: welding a steel plate at the end of the secondary lining trolley, the arc of the steel plate matches the arc of the end of the secondary lining trolley;

S2: U-shaped steel hoop spot-welded at the end of the steel plate, one end of the buried rubber waterstop is installed in the U-shaped steel hoop, and the other end is pressed against the steel plate so that it is pre-buried in the next pouring of the secondary lining concrete The internal buried rubber waterstop is isolated from the concrete surface of the poured secondary lining platform;

S3: Use wooden formwork to seal the mold;

S4: After the concrete is poured for the secondary lining, the trolley for the secondary lining is removed to separate the U-shaped steel hoop from the steel plate.

The mold width of the shaping arc mold for the end of the second lining is 18-22cm; a 4-6mm thick steel plate is welded on the end template of the second lining trolley.

The mid-buried rubber waterstop is pre-buried in the 14-16cm of the secondary lining concrete that has been poured; the exposed 14-16cm is in the secondary lining concrete to be poured.

The U-shaped steel hoop is a U-shaped hoop of steel bars with a length of 14-16 cm and a diameter of 5-7 mm.

It also includes the following steps: the pouring of the secondary lining concrete is formed through the following steps:

S21: mixing concrete outside the tunnel: mixing concrete outside the tunnel to form concrete in a flow-plastic state;

S22: transporting concrete into the tunnel: transporting the concrete to the place to be poured in the tunnel; the place to be poured is the part where there is a rubber waterstop in the construction joint of the secondary lining of the tunnel;

S23: pouring concrete: pouring concrete at the place to be poured;

S24: Concrete maintenance: maintaining the poured concrete;

S25: mold removal: remove the formwork at the end of the second lining of the tunnel;

S26: Sprinkling and curing: Sprinkling and curing the concrete at the pouring place.

The following steps are also included when pouring concrete:

S231: Waterproof layer application: perform waterproof layer treatment on the formwork at the end of the second lining of the tunnel;

S232: Binding of steel bars: Binding of steel bars to the formwork at the end of the second lining of the tunnel treated with the waterproof layer;

S233: the trolley is in place;

S234: Correcting brush release agent.

The construction method of the fixed arc mold back-fixed waterstop at the end of the secondary lining concrete provided in this embodiment uses a mid-buried rubber waterstop used in the circumferential construction joint of the tunnel, with a width of not less than 300mm and a thickness of not less than 8mm. The surface of the belt is not allowed to have cracks, lack of glue, spongy and other defects that affect the use. The eccentricity of the center hole is not allowed to exceed 1/3 of the thickness of the tubular section. There are no dents on the surface of the waterstop. The diameter of the bubble is not greater than 1mm per meter. No more than 3 places are allowed, impurities with an area not greater than 4mm2 shall not exceed 3 places per meter, and seam defects with protrusions or unevenness with a height not greater than 1.5mm shall not exceed 2 places per meter. The mid-buried rubber waterstop should be pre-buried in the 15cm of the secondary lining concrete that has been poured, and 15cm exposed in the secondary lining concrete to be poured.

By processing the shaped arc mold at the end of the secondary lining, it can be ensured that the buried rubber waterstop is pre-embedded in the poured secondary lining concrete 15cm, and the exposed 15cm is in the secondary lining concrete to be poured.

The stereotyped arc mold is 20cm wide and adopts 5mm thick steel plate.

At the end of the secondary lining trolley, a 5mm thick steel plate with a width of 20cm is welded circumferentially. Spot weld the U-shaped hoop of Φ6 steel bar with a length of 15cm at the end of the steel plate, install the buried rubber waterstop 15cm in the U-shaped hoop, and press the other end on the 20cm wide steel plate (this can ensure that it is pre-buried in the next The water stop in the second lining concrete is not in contact with the surface of the second lining concrete pouring), and then the traditional 15cm wide and 50-110cm long wooden formwork sealing mold is used. Because the U-shaped hoop is spot-welded on the steel plate, the secondary lining trolley can be removed when it is moved.

(1) The end of the secondary lining trolley is welded with a 20cm wide 5mm steel plate, and the arc is the same as that of the secondary lining trolley.

(2) Spot-weld the U-shaped hoop of Φ6 steel bar with a length of 15cm at the end of the steel plate, install the buried rubber waterstop 15cm in the U-shaped hoop, and press the other end against the 20cm wide steel plate, so as to ensure that it is pre-buried under the U-shaped hoop. The water stop in the concrete of the secondary lining is not in contact with the concrete surface of the secondary lining to be poured immediately.

⑶Adopt the traditional 15cm wide, 50-110cm long wooden formwork sealing mold

⑷After the concrete is poured for the secondary lining, remove the secondary trolley, because the U-shaped hoop is spot-welded on the steel plate, and the secondary lining trolley can be removed when it is moved.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described with reference to the preferred embodiments of the present invention, those skilled in the art should understand that it can be described in the form Various changes may be made in matter and details thereof without departing from the spirit and scope of the invention as defined.

Claims (6)

1. The construction method of setting the arc mold at the end of the secondary lining concrete back to fix the waterstop, including the secondary lining trolley and the shaping arc mold at the end of the second lining, which is characterized in that it includes the following steps: S1: welding a steel plate at the end of the secondary lining trolley, the arc of the steel plate matches the arc of the end of the secondary lining trolley; S2: U-shaped steel hoop spot-welded at the end of the steel plate, one end of the buried rubber waterstop is installed in the U-shaped steel hoop, and the other end is pressed against the steel plate so that it is pre-buried in the next pouring of the secondary lining concrete The internal buried rubber waterstop is isolated from the concrete surface of the poured secondary lining platform; S3: Use wooden formwork to seal the mold; S4: After the concrete is poured for the secondary lining, the trolley for the secondary lining is removed to separate the U-shaped steel hoop from the steel plate. 2. according to claim 1, the construction method of the fixed arc mold of the secondary lining concrete end, is characterized in that: the die width of the shaped arc mold of the second lining end is 18-22cm; adopt 4- The 6mm thick steel plate is welded on the end template of the second lining trolley. 3. The construction method of the secondary lining concrete end shape-setting arc mold back-fixing waterstop according to claim 1, characterized in that: the buried rubber waterstop is pre-buried in the poured secondary lining concrete 14 -16cm; exposed 14-16cm in the secondary lining concrete to be poured. 4. The construction method of the fixed arc mold of the secondary lining concrete end according to claim 1, characterized in that: the U-shaped steel hoop is a steel bar with a length of 14-16cm and a diameter of 5-7mm. U-shaped hoop. 5. The construction method for setting the arc mold of the secondary lining concrete end according to claim 1, characterized in that: it also includes the following steps: the pouring of the secondary lining concrete is formed by the following steps: S21: mixing concrete outside the tunnel: mixing concrete outside the tunnel to form concrete in a flow-plastic state; S22: transporting concrete into the tunnel: transporting the concrete to the place to be poured in the tunnel; the place to be poured is the part where there is a rubber waterstop in the construction joint of the secondary lining of the tunnel; S23: pouring concrete: pouring concrete at the place to be poured; S24: Concrete maintenance: maintaining the poured concrete; S25: mold removal: remove the formwork at the end of the second lining of the tunnel; S26: Sprinkling and curing: Sprinkling and curing the concrete at the pouring place. 6. The construction method for setting the shape of the arc mold of the secondary lining concrete end according to claim 5, characterized in that: the pouring of concrete also includes the following steps: S231: Waterproof layer application: perform waterproof layer treatment on the formwork at the end of the second lining of the tunnel; S232: Binding of steel bars: Binding of steel bars to the formwork at the end of the second lining of the tunnel treated with the waterproof layer; S233: the trolley is in place; S234: Correcting brush release agent.