CN214362918U - Few excavation structure of cast-in-place section of side span - Google Patents
Few excavation structure of cast-in-place section of side span Download PDFInfo
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- CN214362918U CN214362918U CN202023326790.2U CN202023326790U CN214362918U CN 214362918 U CN214362918 U CN 214362918U CN 202023326790 U CN202023326790 U CN 202023326790U CN 214362918 U CN214362918 U CN 214362918U
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Abstract
The utility model relates to a few excavation structures of side-span cast-in-place section, including case roof beam, concrete cushion, side slope upper and lower steps, abutment, sand cushion, side-span abutment and case roof beam bottom manhole; the upper part of the abutment is provided with a box girder; a concrete cushion layer and a sand cushion layer are sequentially paved on the bottom die of the unearthed slope body at the bottom of the box girder; a box girder bottom manhole is arranged at the position, close to the side-span bridge abutment, of the bottom of the box girder and is positioned above the excavation channel; one side of the excavation channel is a reserved non-excavation surface; and side slopes are excavated on two sides of the box girder, and the side slopes are provided with side slope upper and lower steps. The utility model has the advantages that: the utility model has the advantages that the construction period can be greatly reduced by carrying out the few excavation construction on the side-span cast-in-place section, the original appearance of the mountain is protected, the resource waste is reduced, and the virtuous circle of the green construction ecological environment and the sustainable development idea of the social environment are ensured; the utility model discloses can guarantee the convenience that the inside inspection of bridge and support were changed, the design maintenance of manhole passageway is more convenient.
Description
Technical Field
The utility model relates to a cast-in-place section construction technical field of mountain area bridge edge-span, concretely relates to few excavation structure in cast-in-place section bottom of cutting edge-span.
Background
The traditional construction of cut side-span cast-in-place sections generally adopts a construction method of a slotted deep-digging support bottom die, firstly, a large excavation is carried out on an original mountain side slope, the excavation is carried out to 1.8-2.0m below the elevation of a bottom plate of a designed box girder, and a space is reserved for the maintenance and replacement of a support in the future. When the excavation cutting depth is darker, the slope excavation and the construction working face reserved on two sides are considered simultaneously, so that the volume of excavated mountain soil and stone is greatly increased, a large amount of manpower and material resources are consumed, the dual influences of the complex construction technology and the limited working face are particularly consumed, the soil body in a mountain area is greatly disturbed in the construction process, the original appearance of the mountain is damaged, the resource waste is caused, and the surrounding ecological environment is damaged. Along with the improvement of virtuous circle of resource ecological environment and sustainable development concept of social economy, the attention degree of the problems of damage and the like of the original mountain environment caused by the construction of the bridge in the mountain area is higher and higher, so that higher requirements are provided for the construction of the expressway in the mountain area.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a few excavation structure of cast-in-place section of sidespan to general excavation method excavation face in mountain area high side abrupt slope is big, the engineering volume is big and former massif destroys serious scheduling problem.
The side-span cast-in-place section few-excavation structure comprises a box girder, a concrete cushion layer, side slope upper and lower steps, an abutment, a sand cushion layer, a side-span abutment and a box girder bottom manhole; the upper part of the abutment is provided with a box girder; a concrete cushion layer and a sand cushion layer are sequentially paved on the bottom die of the unearthed slope body at the bottom of the box girder; a box girder bottom manhole is arranged at the position, close to the side-span bridge abutment, of the bottom of the box girder and is positioned above the excavation channel; one side of the excavation channel is a reserved non-excavation surface; and side slopes are excavated on two sides of the box girder, and the side slopes are provided with side slope upper and lower steps.
Preferably, the method comprises the following steps: and a support is arranged between the abutment and the box girder.
Preferably, the method comprises the following steps: the slope gradient is 30-45 degrees.
Preferably, the method comprises the following steps: the slope toe is provided with a side ditch.
The utility model has the advantages that:
1. the utility model discloses a cast-in-place section is striden to the opposite side and the construction of excavating less, can greatly reduced construction period, protects the former physiognomy of massif simultaneously, has guaranteed green construction ecological environment's virtuous circle and social environment's sustainable development theory when reducing the wasting of resources.
2. The utility model discloses can guarantee the convenience that the inside inspection of bridge and support were changed, the design maintenance of manhole passageway is more convenient.
Drawings
FIG. 1 is a sectional view of side span cast-in-place section construction with less excavation;
FIG. 2 is a schematic view of a side-span cast-in-place section less excavation local structure;
fig. 3 is a schematic view of a traditional side-span cast-in-place section bottom die large excavation local structure.
Description of reference numerals: 1-a box girder; 2-concrete cushion; 3-side slope up and down steps; 4-side ditch; 5-support; 6-abutment; 7-a sand cushion layer; 8-a side span abutment; 9-excavating a channel on the full section; 10-box girder bottom manhole; 11-excavating a channel; 12-reserving an unearthed surface.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
The utility model provides a few excavation structures of cast-in-place section of sidespan and construction method, it is big to combine the general excavation method excavation face of mountain area high side abrupt slope, the engineering volume is big and former massif destroys characteristics such as serious, develop a cast-in-place innovation technique of no bed die based on sand cushion layer, can reduce about 2m of the cast-in-place section excavation depth of sidespan (only need be in the pedestrian hole of neighbouring abutment department excavation 2m, it establishes the manhole to be used and the roof beam top is opened for the support is changed in the future to maintain, reducible side slope excavation operation face, reduce the cubic meter of earth and stones by a wide margin), play green construction, energy-concerving and environment-protective, advantages such as reduction massif interference.
Example one
The side span cast-in-place section few-excavation structure comprises a box girder 1, a concrete cushion layer 2, a side slope upper step 3, a side slope lower step 3, an abutment 6, a sand cushion layer 7, a side span abutment 8 and a box girder bottom manhole 10; the upper part of the bridge abutment 6 is provided with a box girder 1, a bottom die of a non-excavated slope body at the bottom of the box girder 1 is sequentially paved with a concrete cushion layer 2 and a sand cushion layer 7, a box girder bottom manhole 10 is arranged at the position, close to the side-span bridge abutment 8, of the bottom of the box girder 1, the box girder bottom manhole 10 is positioned above an excavation channel 11, and a reserved non-excavated surface 12 is arranged on one side of the excavation channel 11; and side slopes are excavated on two sides of the box girder 1, and the side slopes are provided with side slope upper and lower steps 3.
As a preferred embodiment, a support 5 is provided between the abutment 6 and the box girder 1.
As a preferred embodiment, the slope gradient is 30 ° to 45 °.
As a preferred embodiment, the toe is provided with a gutter 4.
Firstly, auditing a manhole design drawing of a box girder bottom plate of a side-span cast-in-place section, communicating with a design institute, and changing the manhole of the box girder bottom plate of the side-span cast-in-place section to a position close to a bridge abutment on the basis of calculation; and reserving a transverse channel with the width of 2m and the height of 1.8m at the position close to the abutment according to the requirement of long-term support maintenance or replacement. And then, according to the structural size of the box girder, carrying out field measurement and lofting, determining a reasonable excavation slope and an excavation surface, and lofting out a 2m deep pedestrian passageway adjacent to the bottom of the box girder of the abutment. And reserving unearthed slope bodies at the bottoms of the other box girders as bottom formwork elevations, wherein the reserved height of the bottom formwork top elevations and the designed box girder bottom elevations is 25cm, and a sand cushion layer (with the thickness of 10cm) and a concrete cushion layer (with the thickness of 15cm) are arranged at the upper parts of the bottom formworks of the slope bodies. The width of the pedestrian passageway is 2m, the height of the pedestrian passageway is 2m, the length of the transverse bridge towards the excavation surface is 1m, the transverse bridge extends to the edge along the width of the box girder, and the transverse bridge is downward sloping to the excavation surface. The slope control is 30 to 45 degrees, and the stair climbing channel is arranged at the slope position, so that the box girder support can be conveniently checked and replaced, and meanwhile, the drainage channel is reserved at the position of the slope toe and is used for draining rainwater.
The manhole maintenance channel is arranged on the upper portion of the excavation face, the manhole reserved width is 1.2m, the length is 2.4m, and a reliable space is provided for bridge maintenance and support replacement in the future. The height of the manhole maintenance channel from the digging surface is 2 meters, and the manhole maintenance channel can be accessed by generally adopting the assistance of stairs.
Example two
The construction method of the side span cast-in-place section few-excavation structure comprises the following steps:
the method comprises the following steps: and measuring the reference surface of the side span cast-in-place section. And measuring the reference surface of the cast-in-place section by using a total station, finding out redundant mountain bodies, and excavating to ensure that the difference between the bottom die and the lower part of the cast-in-place section is 25 cm.
Step two: and constructing the sand cushion and the concrete cushion. After cleaning and trimming the reference surface, a concrete cushion layer 2 is arranged, the thickness of the concrete cushion layer is 7cm, and a 5cm sand cushion layer 7 is paved on the upper part of the concrete cushion layer 2.
Step three: and (5) less excavation construction. Calculating the distance from the side span cast-in-place section to the side span bearing platform, simultaneously calculating the stress condition of a reference surface, carrying out slope excavation in front of the bearing platform, wherein the excavation width and the depth are 2m, the two sides of the excavation length exceed 1m of each flange plate, the slope excavation is carried out in the long edge direction, the slope is controlled to be 30-45 degrees, simultaneously excavating a side ditch at the slope foot, the depth of the side ditch is 15cm, the width is 20cm, the slope of the side ditch is controlled to be 2 percent, and a manhole 10 at the bottom of a box girder is reserved at the upper part of the excavation surface, so that the inspection, the replacement and the maintenance of the support are convenient.
Step four: and (5) constructing a lower channel. The long-edge direction slope surface is trimmed, A16 steel bars are implanted, then a steel bar cage and a stair formwork are manufactured, pouring forming is conducted, and up-and-down passing is facilitated.
Claims (4)
1. The utility model provides a few excavation structure of cast-in-place section of side span which characterized in that: the device comprises a box girder (1), a concrete cushion layer (2), a side slope upper step and a side slope lower step (3), an abutment (6), a sand cushion layer (7), a side span abutment (8) and a box girder bottom manhole (10); the upper part of the abutment (6) is provided with a box girder (1); a concrete cushion layer (2) and a sand cushion layer (7) are sequentially laid on a bottom die of a non-excavated slope body at the bottom of the box girder (1); a box girder bottom manhole (10) is arranged at the bottom of the box girder (1) close to the side span bridge abutment (8), and the box girder bottom manhole (10) is positioned above the excavation channel (11); one side of the excavation channel (11) is a reserved non-excavation surface (12); slopes are excavated on two sides of the box girder (1), and the slopes are provided with slope upper and lower steps (3).
2. The few excavation structure of cast-in-place section of sidespan of claim 1, characterized in that: a support (5) is arranged between the abutment (6) and the box girder (1).
3. The few excavation structure of cast-in-place section of sidespan of claim 1, characterized in that: the slope gradient is 30-45 degrees.
4. The few excavation structure of cast-in-place section of sidespan of claim 1, characterized in that: the slope toe is provided with a side ditch (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023326790.2U CN214362918U (en) | 2020-12-31 | 2020-12-31 | Few excavation structure of cast-in-place section of side span |
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| CN202023326790.2U CN214362918U (en) | 2020-12-31 | 2020-12-31 | Few excavation structure of cast-in-place section of side span |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796360A (en) * | 2020-12-31 | 2021-05-14 | 浙大城市学院 | Side-span cast-in-place section few-excavation structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796360A (en) * | 2020-12-31 | 2021-05-14 | 浙大城市学院 | Side-span cast-in-place section few-excavation structure and construction method |
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