Whether the culvert should be set up with a board, about the culvert cover plate, please enter the m

Only Mingtong needs to build a board.

1. The 2cm gap of BAI between adjacent plates.

du。Not every board has to leave a 2cm gap, but.

The DAO is in accordance with the culvert foundation and the segments of the dedicated wall.

Make a reservation. For example, the foundation and the wall are 3 meters each, and according to your 99cm board, there are three pieces. In this way, as long as it is reserved at both ends of this section, it is not necessary to reserve 99cm.

2cm is just stuffed with asphalt boards. Finally, when the overall construction of the culvert top A waterproof layer, it is good to lay waterproof at one time.

2. 2cm between the cover plate and the cap. There is no need to keep this, and it is poured directly at one time. The drawings are designed to be 2cm and are only for installation. Nothing else.

3. It cannot be poured into an allegro as a whole. If this is done, if the foundation has settled, it will pull the cover plate and form cracks.

The width of the culvert cover plate refers to the junction of the cover plate. During the installation of the culvert cover, the size of the lap width will affect the bearing capacity and stability of the cover. Therefore, the requirement of lap width is very important.

Here are some possible requirements for culvert cover lap width:1Minimum requirements for lap width:

Generally, the lap width should not be less than 200 mm, which can ensure the bearing capacity and stability of the cover. 2.Increase in lap width:

For large culvert covers, the lap width is generally increased appropriately to enhance its load-bearing capacity and stability. The specific increase depends on the size of the culvert cover and the design requirements, usually more than 200 mm. 3.

Multi-board lap joint: If the culvert cover plate is too large and multiple plates need to be used for the canopy lap, then the lap width should also be increased appropriately to ensure the mutual stability and connection between the multiple plates. The unreasonable and insufficient lap width may lead to the instability of the cover plate and the insufficient load-bearing situation, which will affect the normal operation of the culvert.

At the same time, the lap joint of the cover plate also needs to pay attention to the flatness and tightness of the lap joint to prevent water and dust from penetrating into the culvert and affecting the smooth flow of the road. Dear

1. The steel bars of the cover culvert wall are pre-embedded in the foundation, and the foundation concrete is pre-buried before the foundation;

2. The ordinary cover plate culvert wall is of equal section, and the formwork can be installed after the steel bar is tied. Pay attention to the anti-deformation support of the formwork and the tie rod;

3. Pouring concrete in layers, vibrating while pouring;

4. Pay attention to the mix ratio and water leakage of concrete, if the water leakage of concrete is too large, the concrete panel will have water traces of different colors and depths after demoulding, which will affect the appearance;

5. Pay attention to the maintenance after concrete pouring.

6. There are two methods for the cover plate: on-site support pouring and prefabricated installation in the prefabrication yard; If the support is poured on site, it is between the two walls. Note that the height of the bracket can be adjusted (for removal). install the bottom mold on the support, and install the steel bar on the bed mold;

7. When the reinforcement is installed, pay attention to the position of the fulcrum between the cover plate and the wall, and generally use asphalt and two layers of linoleum to separate;

8. Pouring concrete, curing to be strong, removing the bottom mold, and mortar sealing.

9. If it is a prefabricated cover plate, it is lifted and installed in place by crane. Of course, the fulcrum position is treated as above;

10. After all the concrete work is completed, apply asphalt on the top of the wall and cover plate to prepare for filling.

<>1) When the cap, body and wall of cast-in-place concrete culvert are integral, the body and foundation can be poured continuously, or can be poured discontinuously. The figure-eight opening or the cone slope opening should be separated from the culvert.

2) When the culvert and the foundation of concrete are poured separately, the part where the top surface of the foundation and the culvert are connected should be drawn into a rough surface, and the anchor steel bar is arranged. Foundations, culverts and cave openings (except for cap stones) should meet the requirements specified in this code when they are made of stone.

3) The culvert or cover plate can be built in sections according to the settlement joints set in the drawings.

4) When the drawings require the reinforced concrete cover plate to be anchored together with the culvert, the anchor bolt should be fixed according to the provisions of the drawings or other methods approved by the engineer.

5) When the support beam is designed, the ballast should be completed before installing or pouring the cover plate.

6) The following matters should be paid attention to when installing precast concrete cover slabs in Peib:

a.The strength of the culvert cap reaches more than 70% of the design strength.

b.After installation, the hoisting device on the cover plate should be filled with mortar or other materials approved by the engineer; High-grade (1 2) cement mortar is used to fill and compact between adjacent plates.

c.Before the cover plate is installed, the finished product and culvert size should be checked.

Net span: l0=; Length of shelving on one side:;

Calculate span: l=; The top of the cover plate is high from the road surface: h=1m; (approximate 1 meter) single boring block cover plate thickness d=; The width of a single cover plate is b=; Protective layer thickness c=35mm;

The concrete strength grade is C20;

Axial compressive strength fc=; axial tensile strength ft=;

The main tension steel bar type is HRB335; Design value of tensile strength fy=210MPa;

The bulk density of the cover type plate is 1=25kn m3; The average volume weight of the pavement structure layer on the top of the cover plate is 2=20kn m3

Structural design principle and design basis.

According to the "Highway Culvert Design Rules" (JTGTD 64-04-2007), the middle cover plate can be calculated according to the simply supported plates at both ends, and the horizontal force from the culvert can be ignored. According to the "Highway Culvert Design Rules" (JTGTD 64-04-2007), the important road safety level of the city is Grade II.

1) "Detailed Rules for the Design of Highway Culverts" (JTGTD 64-04-2007) 2) "General Code for the Design of Highway Bridges and Culverts" (JTG D60-2004) 3) "Code for the Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts" (JTG D62-2004).