CN112391961A - Construction method of cast-in-place platform wall with multi-point tenon - Google Patents
Construction method of cast-in-place platform wall with multi-point tenon Download PDFInfo
- Publication number
- CN112391961A CN112391961A CN202011484118.8A CN202011484118A CN112391961A CN 112391961 A CN112391961 A CN 112391961A CN 202011484118 A CN202011484118 A CN 202011484118A CN 112391961 A CN112391961 A CN 112391961A
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- Prior art keywords
- platform wall
- cast
- napping
- round holes
- tenon
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F1/00—Construction of station or like platforms or refuge islands or like islands in traffic areas, e.g. intersection or filling-station islands; Kerbs specially adapted for islands in traffic areas
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention relates to a construction method of a cast-in-place platform wall with a multi-point tenon, which is characterized in that roughening treatment is carried out on a hardened ground; lofting according to the site; inserting and binding steel bars; filling and integrally pouring with the platform wall above the ground; backfilling non-frost heaving medium sand or coarse sand; the platform wall is provided with an expansion joint; the lower part of the platform wall is provided with a water drainage hole. The method of implanting the platform wall bottom plate additional point type ribbed tenon into the hardened ground of the existing goods yard is adopted, so that the large excavation of the foundation is avoided, the influence of the platform wall construction on the line roadbed is reduced, the influence on the existing line roadbed is reduced, the construction period is shortened, and the manufacturing cost is reduced.
Description
Technical Field
The invention relates to a construction method of a cast-in-place platform wall with a multi-point tenon, and belongs to the field of civil engineering construction.
Background
With the development of the development and the adjustment of the economic industry structure, the transportation enterprises have developed unprecedented vitality, and various transportation modes develop rapidly, so that the demand of the goods transportation market is greatly changed.
The platform wall is used as a necessary engineering facility of a railway freight yard and is generally close to a railway line, so that the platform wall is the most time-consuming and labor-consuming engineering project in freight yard transformation, the investment is the minimum in the transformation process, the existing conditions are fully utilized, the resource allocation is more reasonable, and the innovative structural design is particularly important.
The traditional cargo platform wall is made of reinforced concrete cantilever type platform wall, which is composed of a cantilever end, a wall heel plate and a wall toe plate and is in an inverted T shape, a foundation part is embedded, and the stability of the platform wall is mainly maintained by the self weight and the gravity borne by the soil above the wall heel plate. In addition, in northern areas, due to the influence of lower air temperature, in order to prevent frost heaving damage of foundation soil, the foundation burial depth needs to meet the requirement of local frost heaving depth, so that the traditional method is greatly influenced by seasons, the earth excavation amount is large, the requirement of backfilling is strict, the foundation is changed and filled with thicker soil, and the defects of long construction period, high construction cost and the like are caused. Even, if the construction is carried out beside the existing road, the potential safety hazard of settlement of the existing road bed can be caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a construction method of a cast-in-place platform wall with multi-point tenons, which adopts a method that platform wall bottom plates are additionally provided with point type ribbed tenons to be implanted into the hardened ground of an existing goods yard, avoids large excavation of a foundation, reduces the influence of platform wall construction on a line roadbed, reduces the influence on the existing line roadbed, shortens the construction period and reduces the manufacturing cost.
In order to solve the above problems, the specific technical scheme of the invention is as follows: the construction method of the cast-in-situ platform wall with the multi-point tenon comprises the following steps of: the first step is as follows: performing galling treatment on the hardened ground;
the second step is that: drilling a steel bar positioning round hole according to field lofting;
the third step: inserting steel bars into the positioning round holes and binding the rest of the platform wall panels and the rest of the platform steel bars;
the fourth step: c30 concrete is used for filling the positioning round holes to make the steel bars and the positioning round holes form an integral structure, and the integral structure is integrally poured with the platform wall above the ground;
the fifth step: backfilling non-frost heaving medium sand or coarse sand within 1 m behind the platform wall, wherein the compaction coefficient is less than 0.97;
and a sixth step: setting an expansion joint at intervals of 18m on the platform wall, wherein the width of the joint is 50mm, and caulking the joint by cement-based sealant;
the seventh step: and a drainage hole is arranged at the position 200mm away from the road shoulder at the lower part of the platform wall.
In the first step, when in napping, the napping device leans against the template, the napping is carried out along the cross slope direction, and the napping is carried out once without stopping midway, so that the napping texture is smooth, and the napping depth is 1-2 mm.
And in the second step, drilling a positioning round hole with the diameter of 100mm on the original concrete ground, wherein the drilling depth is 200mm, two round holes are arranged in each linear meter range along the line direction, at least two round holes are arranged in each linear meter range, and the center distance between the two round holes is at least 500 mm.
And in the third step, three-stage reinforcing steel bars with bent hooks, which are 300mm long and 12mm in diameter, are inserted into the positioning round holes.
In the seventh step, the diameter of the water drainage holes is 100mm, and the distance between the holes is 2-3 m.
The invention has the following beneficial effects: 1) the platform wall bottom plate additional point type ribbed tenon is implanted into the hardened ground of the existing goods yard, so that the large excavation of the foundation is avoided, the influence of the platform wall construction on the line roadbed is reduced, the influence on the existing line roadbed is reduced, the construction period is shortened, the manufacturing cost is reduced, and the construction efficiency is improved.
2) The sliding force of soil is 'resisted' by the friction force of the platform wall bottom plate and the shearing force of the tenon.
3) The construction working face is closer to the existing line, and the problem of hidden danger of settlement of the existing line subgrade caused by construction of the platform wall is solved.
4) The problems of short construction period and heavy tight task of the lines on the two sides of the blockade are solved, the manufacturing cost is reduced, the construction efficiency is improved, and the technical risk and the construction risk of the structure are reduced.
Drawings
Fig. 1 is a schematic view of a cast-in-place platform wall structure with a multi-point tenon.
Detailed Description
As shown in fig. 1, a method for constructing a cast-in-place platform wall with a multi-point tenon includes the steps of providing a hardened floor 1 within a foundation slab of the platform wall, and: carrying out napping treatment on the hardened ground 1, wherein during napping, a pattern-drawing device is close to a template and is carried out along the direction of a cross slope, and the pattern-drawing device cannot stay in the middle of one-time napping, so that napping textures are smooth, and the napping depth is 1-2 mm;
the second step is that: according to field lofting, drilling positioning round holes 2 with the diameter of 100mm on the original concrete ground, wherein the positions of the positioning round holes 2 can be adjusted according to the actual condition of the road surface, selecting places with smaller ground condition damage, and the drilling depth is 200mm, so that two round holes are ensured to be arranged in each linear meter range along the road direction, at least two positioning round holes 2 are arranged in each linear meter range, and the central distance between the two positioning round holes 2 is at least 500 mm;
the third step: three-level bent hook steel bars 3 with the length of 300mm and the diameter of 12mm are inserted into the positioning circular holes 2, the holding force of concrete to the steel bars is increased, and then the remaining platform wall panels and the bottom plate steel bars are bound;
the fourth step: c30 concrete is used for filling the positioning round hole 2 to be solid, so that the steel bar 3 and the positioning round hole 2 form an integral structure, and the integral structure is integrally poured with a platform wall above the ground;
the fifth step: backfilling non-frost heaving medium sand or coarse sand within 1 m behind the platform wall, wherein the compaction coefficient is less than 0.97;
and a sixth step: setting an expansion joint at intervals of 18m on the platform wall, wherein the width of the joint is 50mm, and caulking the joint by cement-based sealant;
the seventh step: and drainage holes are arranged at the lower part of the platform wall 200mm away from the road shoulder, and the distance between the holes is 2-3 m, so that the platform wall with the tenon is formed. In order to remove water permeating into core soil of the platform through gaps of the platform surface, drainage holes with the diameter of 100mm need to be arranged at the positions 200mm away from the ground at the lower part of the platform wall, and the distance between holes is 2-3 m.
And (3) calculating the thickness of the platform wall, the shearing bearing capacity of the reinforcing bars and the embedded bars to resist the wall body sliding force by utilizing the calculation and analysis software of the rational geotechnical engineering, controlling the crack to be not more than 0.2mm, and controlling the integral stability coefficient to be not less than 1.25.
What has been described above is merely a preferred embodiment of the invention. It should be noted that variations and modifications can be made by those skilled in the art without departing from the principle of the present invention, and they should also be considered as falling within the scope of the present invention.
Claims (5)
1. The construction method of the cast-in-situ platform wall with the multi-point tenon comprises the existing hardened ground which is positioned in the range of the foundation slab of the platform wall, and is characterized by comprising the following steps: the first step is as follows: performing galling treatment on the hardened ground;
the second step is that: drilling a steel bar positioning round hole according to field lofting;
the third step: inserting steel bars into the positioning round holes and binding the rest of the platform wall panels and the rest of the platform steel bars;
the fourth step: c30 concrete is used for filling the positioning round holes to make the steel bars and the positioning round holes form an integral structure, and the integral structure is integrally poured with the platform wall above the ground;
the fifth step: backfilling non-frost heaving medium sand or coarse sand within 1 m behind the platform wall, wherein the compaction coefficient is less than 0.97;
and a sixth step: setting an expansion joint at intervals of 18m on the platform wall, wherein the width of the joint is 50mm, and caulking the joint by cement-based sealant;
the seventh step: and a drainage hole is arranged at the position 200mm away from the road shoulder at the lower part of the platform wall.
2. A method of constructing a cast-in-place platform wall with a multipoint tenon according to claim 1, wherein: in the first step, when in napping, the napping device leans against the template, the napping is carried out along the cross slope direction, and the napping is carried out once without stopping midway, so that the napping texture is smooth, and the napping depth is 1-2 mm.
3. A method of constructing a cast-in-place platform wall with a multipoint tenon according to claim 1, wherein: and in the second step, drilling a positioning round hole with the diameter of 100mm on the original concrete ground, wherein the drilling depth is 200mm, two round holes are arranged in each linear meter range along the line direction, at least two round holes are arranged in each linear meter range, and the center distance between the two round holes is at least 500 mm.
4. A method of constructing a cast-in-place platform wall with a multipoint tenon according to claim 1, wherein: and in the third step, three-stage reinforcing steel bars with bent hooks, which are 300mm long and 12mm in diameter, are inserted into the positioning round holes.
5. A method of constructing a cast-in-place platform wall with a multipoint tenon according to claim 1, wherein: in the seventh step, the diameter of the water drainage holes is 100mm, and the distance between the holes is 2-3 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011484118.8A CN112391961A (en) | 2020-12-16 | 2020-12-16 | Construction method of cast-in-place platform wall with multi-point tenon |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011484118.8A CN112391961A (en) | 2020-12-16 | 2020-12-16 | Construction method of cast-in-place platform wall with multi-point tenon |
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| CN112391961A true CN112391961A (en) | 2021-02-23 |
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| CN202011484118.8A Pending CN112391961A (en) | 2020-12-16 | 2020-12-16 | Construction method of cast-in-place platform wall with multi-point tenon |
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Application publication date: 20210223 |
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