CN112227381A - Construction method of asphalt concrete core wall of narrow foundation pit - Google Patents
Construction method of asphalt concrete core wall of narrow foundation pit Download PDFInfo
- Publication number
- CN112227381A CN112227381A CN202011113504.6A CN202011113504A CN112227381A CN 112227381 A CN112227381 A CN 112227381A CN 202011113504 A CN202011113504 A CN 202011113504A CN 112227381 A CN112227381 A CN 112227381A
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- China
- Prior art keywords
- core wall
- asphalt concrete
- water
- foundation pit
- concrete core
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
Abstract
The invention belongs to the field of asphalt concrete core wall construction of narrow foundation pits, and particularly relates to a construction method of an asphalt concrete core wall of a narrow foundation pit. The method comprises the following steps: water retaining ridges are arranged on the left bank and the right bank of the core wall, a water collecting pit and a water retaining stem are arranged on the upstream and the downstream, and a material collecting pit for accumulating transition materials is arranged on the upstream and the downstream; then, a back shovel is adopted to ride the core wall base and a transition material is paved from the right bank to the left bank, and the asphalt mixture is paved from the left bank to the right bank by a loader. The method effectively solves the problems of complex construction process and the like, ensures the construction quality and safety, improves the construction speed of the asphalt concrete core wall, shortens the construction period, meets the requirements of the construction period of the asphalt concrete core wall, and realizes the mechanized construction of asphalt concrete paving in narrow areas.
Description
Technical Field
The invention belongs to the field of asphalt concrete core wall construction of narrow foundation pits, and particularly relates to a construction method of an asphalt concrete core wall of a narrow foundation pit.
Background
With the development of the hydropower industry in China, the asphalt concrete core wall is widely applied, can adapt to various complicated climatic conditions, and has good seepage-proofing effect.
The asphalt concrete core wall construction needs to consider the transportation of asphalt mixture, transition materials and the like. For narrow foundation pits, the construction of the asphalt concrete core wall is more limited by the transportation of water, pollution, mixture and transition materials, the safety of the foundation pit side slope and the like during construction.
The conventional construction method of the asphalt concrete core wall of the narrow foundation pit comprises the following steps: the method of chute, hanging can and manual cart is adopted to transport the asphalt mixture and the transition material, although the operation is simple, the construction speed is slow, the temperature loss is serious in the transportation process of the asphalt mixture, and the quality and the safety of the asphalt concrete core wall cannot be effectively controlled.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a construction method of a narrow foundation pit asphalt concrete core wall. The method is used for solving the construction process complicated in the narrow foundation pit, and meanwhile, the construction quality and safety are guaranteed, and the construction period is shortened.
In order to achieve the purpose, the invention adopts the following technical scheme: a construction method of an asphalt concrete core wall of a narrow foundation pit is characterized by comprising the following steps: water retaining ridges are arranged on the left bank and the right bank of the core wall, a water collecting pit and a water retaining stem are arranged on the upstream and the downstream, and a material collecting pit for accumulating transition materials is arranged on the upstream and the downstream; then, a back shovel is adopted to ride the core wall base and a transition material is paved from the right bank to the left bank, and the asphalt mixture is paved from the left bank to the right bank by a loader.
The left and right banks of the heart wall base are preferably provided with water retaining ridges by sand bags, mortar and rock blocks, the water retaining ridges are used for blocking water seepage of the side slopes of the left and right banks, and accumulated water is pumped and drained into the water collecting pits on the left and right sides by a water pump; the water retaining ribs are arranged between the water retaining ridges of the left bank and the right bank and are used for being connected with the water retaining ridges of the left bank and the right bank, and when water seeps from the water retaining ridges, the water seeps from the water retaining ridges are guided and discharged into the water collecting pit.
Preferably, the water retaining ridge is 1.2m high and 7.5m long, and is respectively positioned at the left bank and the right bank; the width of the sump is 1m and the depth is 0.8 m.
Preferably, the height of the water blocking stem is smaller than that of the water blocking ridge, the water blocking stem is arranged at the upstream position and the downstream position respectively, and the height of the water blocking stem is 0.1 m.
And laying geotextile on the preferable foundation pit slope.
Preferably, two material collecting pits with the height of the upper end surface lower than that of the upper end surface of the asphalt concrete core wall are arranged at the proper positions of the upstream and downstream of the core wall base, and are respectively arranged at the upstream and the downstream, and meanwhile, the external water and the seepage water of the foundation pit are pumped and discharged to the outside of the foundation pit; and the material collecting pit is backfilled by adopting broken stones, the two material collecting pits are alternatively backfilled along with the rise of the height of the core wall, and the material collecting pit is always lower than the asphalt concrete core wall.
The first layer of construction of the preferred asphalt concrete core wall is to backfill a U-shaped groove of the base of the asphalt concrete core wall, and a water retaining stem is arranged outside the U-shaped groove and used for ensuring that external water does not flow into the U-shaped groove.
Preferably, the middle part of the U-shaped groove is provided with a copper water stop.
The preferable material collecting pit is used for stacking transition materials, the material collecting pit is arranged at a wider position at the downstream side of the core wall base, and the transition materials are thrown to the material collecting pit from a downstream slope by a backhoe; when the transition material is paved, a backhoe is adopted to ride the core wall through the core wall-crossing trestle and then the transition material is paved by adopting a backward method from the left bank to the right bank, and the asphalt concrete core wall paved when the transition material is paved is covered by adopting canvas; after the transitional material is paved, paving the asphalt concrete core wall from the left bank to the right bank by using a loader end material through a cross core wall trestle and riding the transitional material; in this way, the asphalt concrete of the narrow part is constructed by adopting a machine to meet the construction position of the paver.
Constructing a right bank lower foundation pit construction access road on the right bank preferably; and the asphalt concrete is transported to the foundation pit through the foundation pit construction pavement under the right bank.
Compared with the prior art, the invention has the beneficial effects that: the method effectively solves the problems of complex construction process and the like, ensures the construction quality and safety, improves the construction speed of the asphalt concrete core wall, shortens the construction period, meets the requirement of the construction period of the asphalt concrete core wall, and realizes the mechanized construction of asphalt concrete paving in narrow areas; the water retaining bank, the water retaining stem and the pump pit are adopted, so that the problem of dry construction of the asphalt concrete core wall is effectively solved; the geotextile is laid on the side slope of the foundation pit, so that the problems of asphalt concrete junction surface pollution and side slope rock rolling caused by rain catchment are effectively solved; meanwhile, the transition material collecting pit is arranged, so that the problem of mechanical construction of the asphalt concrete core wall of the narrow foundation pit is solved, and the construction speed is greatly improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a schematic diagram of the transition material for paving asphalt mixture of the present invention.
Fig. 3 is a schematic view of the construction of the core base according to the present invention.
Fig. 4 is a construction schematic diagram of the water retaining ridge arranged on the left bank and the right bank.
FIG. 5 is a schematic representation of a backhoe transporting paving transition in accordance with the present invention.
FIG. 6 is a schematic diagram of the construction of the loader for transporting and paving the asphalt mixture.
FIG. 7 is a schematic view of the loader of the present invention after transporting the paved asphalt mixture.
In the figures, the names corresponding to the reference numerals are a water collecting pit 1, a water retaining ridge 2, a water retaining stem 3, a U-shaped groove 4, a copper water stop 5, a material collecting pit 6, a foundation pit construction access 7 under the right bank, a back hoe 8 and a loader 9.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1 to 7, a method for constructing an asphalt concrete core of a narrow foundation pit includes the following steps: the method comprises the following steps that water retaining ridges 2 are arranged on the left bank and the right bank of a core wall, a water collecting pit 1 and a water retaining stem 3 are arranged on the upstream and the downstream, and a material collecting pit 6 for accumulating transition materials is arranged on the upstream and the downstream; then, a back shovel 8 is used for riding a core wall base and paving transition materials from the right bank to the left bank, a hydraulic back shovel is preferably used for the back shovel 8, and asphalt mixtures are paved by riding the transition materials from the left bank to the right bank through a loader 9;
1) the water retaining ridges 2 are arranged on the left and right banks of the core wall base by sand bags, mortar and rock blocks, the water retaining ridges 2 are 1.2m high and 7.5m long, and the water retaining ridges 2 are respectively positioned on the left and right banks; the water retaining bank 2 is used for blocking water seepage of the left and right bank slopes and pumping accumulated water into the water collecting pits 1 on the left and right sides by adopting a water pump; the width of the water collecting pit 1 is 1m, the depth is 0.8m, the water blocking stems 3 with lower height are arranged between the water blocking ridges 2 of the left bank and the right bank, the water blocking stems 3 are used for being connected with the water blocking ridges 2 of the left bank and the right bank, the height of the water blocking stem 3 is smaller than that of the water blocking ridge 2, the water blocking stem 3 is respectively arranged at the upstream position and the downstream position, and the height of the water blocking stem 3 is 0.1 m; when the water retaining bank 2 has water seepage, the water seepage of the water retaining bank 2 is guided and drained to the water collecting pit 1. The preferable foundation pit side slope is paved with geotextile, so that the problems of asphalt concrete junction surface pollution and side slope rock rolling caused by rain catchment are effectively solved; the water retaining stems 3 are arranged at the upper and lower positions of the core wall base and matched with the side slopes to lay geotextile, so that the entering of external water and the pollution of silt to the bonding surface of the asphalt concrete core wall are prevented.
2) The appropriate position of the upstream and downstream of the core wall base is provided with two material collecting pits 6, the height of the upper end surface of each material collecting pit is lower than that of the upper end surface of the asphalt concrete core wall, the two material collecting pits 6 are respectively arranged at the upstream and the downstream, and meanwhile, the external water and the foundation pit seepage water are pumped and discharged to the outside of the foundation pit; the material collecting pits 6 are backfilled by adopting broken stones, the two material collecting pits 6 are alternatively backfilled along with the rise of the height of the core wall, and the material collecting pits 6 are always lower than the asphalt concrete core wall.
3) The first layer of construction of the asphalt concrete core wall is to backfill a U-shaped groove 4 of the asphalt concrete core wall base, and a water retaining stem 3 is arranged outside the U-shaped groove 4 and used for ensuring that external water does not flow into the U-shaped groove 4; the middle part of the preferable U-shaped groove 4 is provided with a copper water stop 5;
4) the material collecting pit 6 is used for accumulating transition materials, the material collecting pit 6 used for accumulating the transition materials is arranged, the problem of mechanical construction of the asphalt concrete core wall of the narrow foundation pit is solved, and the construction speed is greatly improved. The material collecting pit 6 is arranged at a wider position at the downstream side of the core wall base, and transition materials are thrown to the material collecting pit from a downstream slope by a back-hoe 8; building a foundation pit construction access road 7 under the right bank on the right bank; the asphalt concrete is transported to the foundation pit from the foundation pit construction access 7 under the right bank; when the transition material is paved, a backhoe 8 is adopted to ride on the core wall through a core wall spanning trestle 10, then the core wall is paved from the left bank to the right bank by a backward method, and the asphalt concrete core wall paved when the transition material is paved is covered by canvas; after the transitional material is paved, paving the asphalt concrete core wall from the left bank to the right bank by using a loader end material through the cross-core wall trestle 10; in this way, the asphalt concrete of the narrow part is constructed by adopting a machine to meet the construction position of the paver.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A construction method of an asphalt concrete core wall of a narrow foundation pit is characterized by comprising the following steps: water retaining ridges are arranged on the left bank and the right bank of the core wall, a water collecting pit and a water retaining stem are arranged on the upstream and the downstream, and a material collecting pit for accumulating transition materials is arranged on the upstream and the downstream; then, a back shovel is adopted to ride the core wall base and a transition material is paved from the right bank to the left bank, and the asphalt mixture is paved from the left bank to the right bank by a loader.
2. The construction method of the asphalt concrete core wall with the narrow foundation pit as claimed in claim 1, wherein sand bags, mortar and rock blocks are adopted on the left and right banks of the core wall base to form water retaining ridges, the water retaining ridges are used for blocking water seepage of the side slopes of the left and right banks, and water pumps are adopted for pumping accumulated water into the water collecting pits on the left and right sides; the water retaining ribs are arranged between the water retaining ridges of the left bank and the right bank and are used for being connected with the water retaining ridges of the left bank and the right bank, and when water seeps from the water retaining ridges, the water seeps from the water retaining ridges are guided and discharged into the water collecting pit.
3. The construction method of the asphalt concrete core wall with the narrow foundation pit as claimed in claim 2, wherein the water retaining ridge is 1.2m high and 7.5m long, and the water retaining ridge is respectively positioned at the left bank and the right bank; the width of the sump is 1m and the depth is 0.8 m.
4. The construction method of the asphalt concrete core wall with the narrow foundation pit as claimed in claim 3, wherein the height of the water blocking stem is less than that of the water blocking ridge, one water blocking stem is arranged at each of the upstream and downstream positions, and the height of the water blocking stem is 0.1 m.
5. The method for constructing an asphalt concrete core wall for a narrow foundation pit according to claim 4, wherein a geotextile is laid on the side slope of the foundation pit.
6. The construction method of the asphalt concrete core wall with the narrow foundation pit as claimed in claim 4, wherein two material collecting pits are arranged at the appropriate upstream and downstream positions of the core wall base, the height of the upper end surface of each material collecting pit is lower than that of the upper end surface of the asphalt concrete core wall, the two material collecting pits are respectively arranged at the upstream and the downstream, and meanwhile, the external water and the seepage water of the foundation pit are pumped and discharged to the outside of the foundation pit; and the material collecting pit is backfilled by adopting broken stones, the two material collecting pits are alternatively backfilled along with the rise of the height of the core wall, and the material collecting pit is always lower than the asphalt concrete core wall.
7. The method for constructing the asphalt concrete core of the narrow foundation pit according to claim 5, wherein the first layer of the asphalt concrete core is constructed by backfilling a U-shaped groove on the base of the asphalt concrete core, and a water retaining stem is arranged outside the U-shaped groove and used for ensuring that outside water does not flow into the U-shaped groove.
8. The construction method of the asphalt concrete core wall for the narrow foundation pit according to claim 7, wherein a copper water stop is arranged in the middle of the U-shaped groove.
9. The construction method of the asphalt concrete core wall with the narrow foundation pit as claimed in claim 6, wherein the material collecting pit is used for stacking transition materials, the material collecting pit is arranged at a wider position at the downstream side of the core wall base, and the transition materials are thrown to the material collecting pit from a downstream side slope by a backhoe; when the transition material is paved, a backhoe is adopted to ride the core wall through the core wall-crossing trestle and then the transition material is paved by adopting a backward method from the left bank to the right bank, and the asphalt concrete core wall paved when the transition material is paved is covered by adopting canvas; after the transitional material is paved, paving the asphalt concrete core wall from the left bank to the right bank by using a loader end material through a cross core wall trestle and riding the transitional material; in this way, the asphalt concrete of the narrow part is constructed by adopting a machine to meet the construction position of the paver.
10. The construction method of the asphalt concrete core wall of the narrow foundation pit according to claim 9, wherein a foundation pit construction access under the right bank is constructed on the right bank; and the asphalt concrete is transported to the foundation pit through the foundation pit construction pavement under the right bank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011113504.6A CN112227381B (en) | 2020-10-17 | 2020-10-17 | Construction method of asphalt concrete core wall of narrow foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011113504.6A CN112227381B (en) | 2020-10-17 | 2020-10-17 | Construction method of asphalt concrete core wall of narrow foundation pit |
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| CN112227381A true CN112227381A (en) | 2021-01-15 |
| CN112227381B CN112227381B (en) | 2022-03-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544487A (en) * | 2022-01-11 | 2022-05-27 | 西安理工大学 | Method for testing bonding performance of asphalt and aggregate interface transition region in core wall dam |
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| CN114544487A (en) * | 2022-01-11 | 2022-05-27 | 西安理工大学 | Method for testing bonding performance of asphalt and aggregate interface transition region in core wall dam |
| CN114544487B (en) * | 2022-01-11 | 2023-10-27 | 西安理工大学 | Method for testing adhesion performance of asphalt and aggregate interface transition area in core wall dam |
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| CN112227381B (en) | 2022-03-11 |
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