CN114411802B - Combined pile joist retaining wall and construction method - Google Patents
Combined pile joist retaining wall and construction method Download PDFInfo
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- CN114411802B CN114411802B CN202111600553.7A CN202111600553A CN114411802B CN 114411802 B CN114411802 B CN 114411802B CN 202111600553 A CN202111600553 A CN 202111600553A CN 114411802 B CN114411802 B CN 114411802B
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- 238000010276 construction Methods 0.000 title claims abstract description 68
- 239000002689 soil Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
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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
- E02D17/20—Securing of slopes or inclines
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a combined pile joist retaining wall and a construction method thereof, comprising a retaining wall, joists and supporting piles, wherein the supporting piles are arranged below the joists and extend downwards and penetrate through old filling soil and a bedrock surface to enter bedrock; a plurality of anti-slide piles are driven into the downstream of the side slope, the lower end parts of the anti-slide piles also extend into the bedrock, an inclined beam is connected between the top of each anti-slide pile and the joist, the inclined beam is obliquely arranged along the side slope, and a plurality of drain pipes are also arranged in the side slope where the inclined beam is positioned; the combined pile joist retaining wall can reduce the cross section size of the lower pile of the retaining wall and the length of the pile by reasonably arranging the supporting piles and the joists, converts most of underground workload into ground measure construction, saves construction period, is safer to construct, and is more beneficial to side slope stabilization because of the reduction of the excavation surface in the middle of the side slope in the construction process.
Description
Technical Field
The invention relates to the technical field of slope support, in particular to a combined pile-joist retaining wall and a construction method.
Background
The pile-joist retaining wall is a composite retaining structure formed from piles, joists and retaining wall, and its main working principle is that the load transferred from retaining wall on the upper portion of the joist is transferred to the piles by means of joists, then the pile can transfer the load into soil layer by means of friction force of soil around the piles and supporting force of pile end soil, and the joists can connect the piles into a whole body to jointly bear load. The pile joist retaining wall can be divided into: single row pile joist retaining wall (balance weight type, gravity type), multiple row pile joist retaining wall (balance weight type, gravity type), anchor cable (rod) pile joist retaining wall (balance weight type, gravity type).
In 2018, a small-sized anti-slide pile group joist retaining wall structure and construction method are disclosed in Chinese patent application (publication No. CN 107675724A), wherein a retaining wall foundation is arranged on a joist, the joist is arranged on the top of the small-sized anti-slide pile group and a steep slope section excavation platform, an anchor cable is arranged at the intersection of the joist and the small-sized anti-slide pile group, the outer end of the anchor cable is anchored at the outer side of the joist, the inner end of the anchor cable is anchored in a stable soil layer or bedrock of a steep slope body, and the lower end of the small-sized anti-slide pile group is anchored in a stable rock soil layer of the steep slope body for a sufficient length. The construction method comprises the following steps: leveling a site, constructing small anti-slide piles, constructing anchor cables, constructing joists, casting (building) a retaining wall, backfilling the back filler of the retaining wall and compacting in layers. The construction of the small anti-slip pile group and the anchor cable requires a large amount of underground construction.
The pile-joist retaining wall expands the application range of a common masonry retaining wall, and when the ground is steep and the earth surface is filled with thicker earth, the foundation can be placed in a stable stratum by adopting the support form of the pile-joist retaining wall, so that the section of the retaining wall can be saved. For high-fill areas, piles are often required to bear vertical forces transmitted by upper retaining walls and horizontal thrust of a filling slope at the same time due to steep earth surfaces. At this time, in order to meet engineering requirements, the section size of the pile is large, and if the pile is manually dug, the construction difficulty is high, the cost is high, and the construction period is long. If the retaining wall is arranged with deep filling soil or the construction site is limited, the bored pile is difficult to construct.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a combined pile-joist retaining wall and a construction method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The combined pile-joist retaining wall comprises a pile-joist retaining wall arranged on a side slope, wherein the pile-joist retaining wall comprises a retaining wall, joists and supporting piles, the joists are arranged at the junction of a new filling and old filling interface of the side slope, the retaining wall is arranged above the joists and used for retaining a part of the new filling, the supporting piles are a plurality of pieces arranged below the joists, and the supporting piles extend downwards and penetrate through the old filling and a bedrock surface to enter into the bedrock; a plurality of anti-slide piles are driven into the old filling soil at the downstream of the side slope, the lower end parts of the anti-slide piles also extend into the bedrock, an inclined beam is connected between the top parts of the anti-slide piles and the joists, and the inclined beam is obliquely arranged along the side slope; and a plurality of drain pipes are also arranged in the side slope where the inclined beam is positioned, and extend into the old filling soil in an inclined manner.
The combined pile joist retaining wall can reduce the cross section size of the lower pile of the retaining wall and the length of the pile by reasonably arranging the supporting piles and the joists, converts most of underground workload into ground measure construction, saves construction period, is safer to construct, and is more beneficial to side slope stabilization because of the reduction of the excavation surface in the middle of the side slope in the construction process.
Compared with the existing retaining wall bottom single-row piles, the pile joist retaining wall has obvious advantages in terms of construction quantity and safety, can greatly reduce the section size and length of a pile body, and reduces the punching quantity and construction difficulty.
When the covering layer of the lower part of the retaining wall is deeper, the sliding force of a part of soil body is transmitted to the lower part of the anti-sliding pile through the arrangement of the inclined beam, the pile body is not required to be additionally arranged in old filling soil, the workload below the ground can be reduced compared with manual hole digging piles, the construction period can be shortened, and the construction is safer and more economical. After the structure is adopted, the excavation surface of the old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope is favorably maintained.
The combined pile joist retaining wall is more convenient and quick in construction, the joists and the supporting piles can be manufactured and installed in sequence respectively, then the retaining wall is constructed, the setting of the joists can be used for transmitting bending moment and force transmitted by the retaining wall and transmitting the force to the anti-slide piles through the oblique beams, and the anti-slide piles have better anti-slide effect and can well disperse and share stress, so that the stress of the retaining wall and the supporting piles is reduced, the supporting piles are not required to be arranged longer and thicker while the stability of a side slope is kept, and the underground construction amount is reduced.
The anti-slide piles and the supporting piles are all deep into the bedrock, and can conduct stress to the bedrock, so that the burden of new and old filling layers is reduced, and the stability of the new and old filling layers is ensured.
Further, the retaining wall is arranged right above the joist or arranged on the side edge of the joist and close to the new filling soil, and the section of the retaining wall is trapezoid.
Furthermore, the retaining wall is one of gravity type, counter weight type and wall-supporting type, and the retaining wall bottom of the retaining wall adopts non-grouting to strengthen the foundation. The retaining wall bottom does not adopt grouting to strengthen the foundation, so that the situation that the side slope is unstable due to the fact that the underground water drainage channel in the side slope is plugged is avoided.
Further, the support pile and the anti-slide pile are vertically arranged on the ground, the distance that the anti-slide pile stretches into the bedrock is larger than the distance that the support pile stretches into the bedrock, and the section size of the support pile is smaller than that of the anti-slide pile.
Further, the supporting piles are steel rail piles or small-section bored piles, a plurality of the supporting piles are arranged in a line in a swinging mode, and the supporting piles with the arrangement structure are easy to operate and construct and can support the joists horizontally and stably.
Further, the top of the supporting pile is embedded into the joist by a certain depth, and the outer side of the joist is connected with the inclined beam. The top of the supporting pile is embedded into the joist by a certain depth, so that the connection strength can be improved, a good limiting effect is achieved, and the relative movement between the joist and the supporting pile can be reduced.
Further, a crown beam is arranged at the top of the slide-resistant pile, and the crown beam is connected with the oblique beam. The crown beam is convenient to connect the inclined beam, and the stress of the slide-resistant pile is improved.
Furthermore, the inclination angle of the inclined beam is 20-70 degrees, the inclination angle of the drain pipes is smaller than that of the inclined beam, a plurality of drain pipes are all positioned in the old filling soil, and the drain pipes are arranged in a quincuncial shape.
The setting of the drain pipe of face upward inclined is convenient for fill the drainage in the soil, simultaneously the drain pipe is in old fill also can play support connection effect, its inclination is less than the inclination of sloping for it can incline and expose from the sloping place domatic of sloping place.
Further, the road surface is arranged on the horizontal part above the new filling soil, and a vertical reinforcement assembly is further arranged in the new filling soil, the old filling soil and the bedrock so as to improve the overall connection strength and stability.
Further, a construction method of the combined pile joist retaining wall comprises the following steps:
(1) Constructing a support pile, arranging the support pile of the pile joist retaining wall at the junction of new and old filling soil of a side slope, wherein the insertion depth of the support pile penetrates through the old filling soil and stretches into bedrock;
(2) The joist construction is carried out, the joist is arranged on the supporting pile, and the pile top of the supporting pile is embedded into the bottom of the joist to a certain depth;
(3) The retaining wall construction is carried out, and the retaining wall is arranged above the joist or near one side of the new filling soil;
(4) The construction of the anti-slide piles, namely driving a plurality of anti-slide piles into the downstream of the old filling soil of the side slope, enabling the anti-slide piles to penetrate through the old filling soil and be inserted into bedrock, and arranging crown beams at the pile tops of the anti-slide piles;
(5) Constructing an inclined beam, wherein one end of the inclined beam is connected with the crown beam, and the other end of the inclined beam is connected with the joist;
(6) And (3) constructing a drain pipe, and installing a plurality of inclined drain pipes in the slope surface where the inclined beam is positioned.
The construction is carried out by adopting the method, the construction amount of the underground part is smaller, the excavation amount of the old filling soil in the middle of the slope is also smaller, the maintenance of slope stability is facilitated, and the combined pile-joist retaining wall is adopted, so that the construction is more convenient, the overall construction period is shortened, and the construction safety is ensured.
Compared with the prior art, the invention has the beneficial effects that: 1. the combined pile-joist retaining wall can reduce the cross section size of the lower pile of the retaining wall and the length of the pile by reasonably arranging the supporting piles and the joists, and convert most of underground workload into ground measure construction, so that the construction period is shortened, the construction is safer, and the reduction of the excavation surface in the middle of a side slope in the construction process is more beneficial to the stability of the side slope; 2. compared with the existing retaining wall bottom single-row piles, the pile joist retaining wall has obvious advantages in terms of construction quantity and safety, can greatly reduce the section size and length of a pile body, and reduces the punching quantity and construction difficulty; 3. when the covering layer at the lower part of the retaining wall is deeper, the sliding force of a part of soil body is transmitted to the anti-sliding piles at the lower part through the arrangement of the inclined beams, so that the workload below the ground can be reduced compared with manual hole digging piles, the construction period can be shortened, and the construction is safer and more economical; 4. after the structure is adopted, the excavation surface of the old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope can be maintained; 5. the joist can be used for transmitting bending moment and force transmitted by the retaining wall and transmitting the force to the anti-slide pile through the oblique beam, so that the stress can be well dispersed and shared, and the stress of the retaining wall and the supporting pile is reduced; 6. the retaining wall bottom does not adopt grouting to strengthen the foundation, so that the situation that the side slope is unstable due to the fact that the underground water drainage channel in the side slope is plugged is avoided.
Drawings
FIG. 1 is a schematic view of a pile joist retaining wall according to the present invention;
FIG. 2 is a schematic view of a combined pile joist retaining wall according to the present invention disposed on a slope;
FIG. 3 is a schematic view showing the construction of another composite pile joist retaining wall of the present invention disposed on a slope;
In the figure: 1. filling soil newly; 2. pile joist retaining wall; 201. a retaining wall; 202. joist; 203. supporting piles; 3. a sloping beam; 4. a drain pipe; 5. an anti-slide pile; 6. road surface; 7. an old filling interface; 8. a bedrock surface.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Embodiment one:
As shown in fig. 1 and 2, a combined pile-joist retaining wall comprises a pile-joist retaining wall 2 arranged on a side slope, wherein the pile-joist retaining wall 2 comprises a retaining wall 201, joists 202 and supporting piles 203, the joists 202 are arranged at the junction of a new fill 1 and an old fill interface 7 of the side slope, the retaining wall 201 is arranged above the joists 202 and used for retaining a part of the new fill 1, the supporting piles 203 are a plurality of piles arranged below the joists 202, and the supporting piles 203 extend downwards and penetrate through the old fill and a bedrock surface 8 to enter bedrock; a plurality of anti-slide piles 5 are driven into the old filling soil at the downstream of the side slope, the lower end parts of the anti-slide piles 5 also extend into the bedrock, an inclined beam 3 is further connected between the top parts of the anti-slide piles 5 and the joists 202, and the inclined beam 3 is obliquely arranged along the side slope; a plurality of drain pipes 4 are also arranged in the side slope where the inclined beam 3 is positioned, and the drain pipes 4 extend into the old filling soil in an inclined way.
The combined pile joist retaining wall can reduce the cross section size of the lower pile of the retaining wall and the length of the pile by reasonably arranging the supporting piles 203 and the joists 202, converts most of underground workload into ground measure construction, saves construction period, is safer to construct, and is more beneficial to side slope stabilization because the excavation surface in the middle of the side slope is reduced in the construction process.
Compared with the existing retaining wall bottom single-row piles, the pile joist retaining wall has obvious advantages in terms of construction quantity and safety, can greatly reduce the section size and length of a pile body, and reduces the punching quantity and construction difficulty.
When the lower covering layer of the retaining wall is deeper, the sliding force of a part of soil body is transmitted to the lower part of the anti-sliding pile 5 through the arrangement of the inclined beam 3, the pile body is not required to be additionally arranged in old filling soil, the workload below the ground can be reduced compared with manual hole digging piles, the construction period can be shortened, and the construction is safer and more economical. After the structure is adopted, the excavation surface of the old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope is favorably maintained.
The combined pile joist retaining wall 2 is more convenient and quick in construction, the joist 202 and the supporting piles 203 can be respectively manufactured and sequentially installed, then the retaining wall 201 is constructed, the setting of the joist 202 can be used for transmitting bending moment and force transmitted by the retaining wall 201 and transmitting the force to the anti-slide piles 5 through the oblique beams 3, and the anti-slide piles have better anti-slide effect, can well disperse and share stress, reduce the stress of the retaining wall 201 and the supporting piles 203, and also do not need to be provided with longer thicker supporting piles while maintaining the stability of a slope, so that the underground construction amount is reduced.
The anti-slide piles 5 and the supporting piles 203 are all deep into the bedrock, and can conduct stress to the bedrock, so that the burden of new and old filling layers is reduced, and the stability of the new and old filling layers is ensured.
Further, the retaining wall 201 is disposed directly above the joist 202, and the retaining wall 201 has a trapezoid cross section.
Further, the retaining wall 201 is one of a gravity type, a counterweight type and a wall-supporting type, and the retaining wall bottom of the retaining wall 201 adopts non-grouting to strengthen the foundation. The retaining wall bottom does not adopt grouting to strengthen the foundation, so that the situation that the side slope is unstable due to the fact that the underground water drainage channel in the side slope is plugged is avoided.
Further, the support piles 203 and the anti-slide piles 5 are vertically arranged on the ground, the distance that the anti-slide piles 5 extend into the bedrock is greater than the distance that the support piles 203 extend into the bedrock, and the section size of the support piles 203 is smaller than the section size of the anti-slide piles 5.
Further, the supporting piles 203 are small-section bored piles, a plurality of supporting piles 203 are arranged in a straight line on the slope, and the supporting piles adopting the arrangement structure are simple to operate, easy to construct and capable of horizontally and stably supporting the joists 202.
Further, the top of the supporting pile 203 is embedded into the joist 202 to a certain depth, and the outer side of the joist 202 is connected with the oblique beam 3. The top of the supporting pile 203 is embedded into the joist 202 to a certain depth, so that the connection strength can be improved, a good limiting effect is achieved, and the relative movement between the joist and the supporting pile can be reduced.
Further, a crown beam is arranged at the top of the slide-resistant pile 5, and the crown beam is connected with the inclined beam 3. The crown beam is arranged to be convenient for connecting the inclined beam 3, so that the stress of the slide-resistant pile is improved.
Furthermore, the inclination angle of the inclined beam 3 is 20-45 degrees, the inclination angle of the drain pipes 4 is smaller than that of the inclined beam 3, a plurality of drain pipes 4 are all positioned in the old filling soil, and the drain pipes 4 are arranged in a quincuncial shape in a slope.
The arrangement of the upward inclined drain pipe 4 is convenient for draining water in the filled soil, meanwhile, the drain pipe 4 can also play a role in supporting and connecting in the old filled soil, and the inclination of the drain pipe is smaller than the inclination angle of the inclined beam, so that the drain pipe can be obliquely exposed from the slope surface of the inclined beam.
Further, the pavement 6 is arranged on the horizontal part above the new filling 1, and a vertical reinforcement assembly is further arranged in the new filling 1, the old filling and the bedrock so as to improve the overall connection strength and stability.
Embodiment two:
the embodiment provides a construction method of a combined pile joist retaining wall, which comprises the following steps:
(1) Constructing a support pile 203, arranging the support pile 203 of the pile joist retaining wall at the junction of new and old filling soil of a side slope, wherein the insertion depth of the support pile 203 penetrates through the old filling soil and stretches into bedrock;
(2) Constructing a joist 202, arranging the joist 202 on the supporting piles 203, and embedding pile tops of the supporting piles 203 into the bottom of the joist 202 to a certain depth;
(3) Constructing a retaining wall 201, and arranging the retaining wall 201 above the joists 202;
(4) The construction of the anti-slide piles 5, namely, driving a plurality of anti-slide piles 5 into the downstream of the old fill of the side slope, wherein the anti-slide piles 5 penetrate through the old fill and are inserted into bedrock, and then arranging crown beams on the pile tops of the anti-slide piles 5;
(5) Constructing an inclined beam 3, wherein one end of the inclined beam 3 is connected with the crown beam, and the other end of the inclined beam is connected with the joist 202;
(6) The drainage pipe 4 is constructed, and a plurality of upward drainage pipes 4 are installed in the slope where the oblique beam 3 is positioned.
The construction is carried out by adopting the method, the construction amount of the underground part is smaller, the excavation amount of the old filling soil in the middle of the slope is also smaller, the maintenance of slope stability is facilitated, and the combined pile-joist retaining wall is adopted, so that the construction is more convenient, the overall construction period is shortened, and the construction safety is ensured.
Embodiment III:
The embodiment provides a combined pile joist retaining wall and a construction method thereof, wherein the method is used for an emergency treatment project of unstable side slope in the later period of the retaining wall construction, and the construction steps are as follows in combination with the construction shown in fig. 3:
(1) Performing construction of a supporting pile 203 under the outer side of the retaining wall constructed in the prior art;
(2) Arranging joists 202 on support piles 203 which are constructed, embedding pile tops of the support piles 203 into the joists 202 to a certain depth, and horizontally abutting the joists 202 against the outer bottom of the retaining wall 201;
(3) The construction of the anti-slide piles 5, namely, driving a plurality of anti-slide piles 5 into the downstream of the old fill of the side slope, wherein the anti-slide piles 5 penetrate through the old fill and are inserted into bedrock, and then arranging crown beams on the pile tops of the anti-slide piles 5;
(4) Constructing an inclined beam 3, wherein one end of the inclined beam 3 is connected with the crown beam, and the other end of the inclined beam is connected with the joist 202;
(5) The drainage pipe 4 is constructed, a drainage hole is arranged in the slope where the oblique beam 3 is positioned, and a plurality of upward-inclined drainage pipes 4 are arranged in the drainage hole.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The combined pile-joist retaining wall is characterized by comprising a retaining wall, joists and supporting piles, wherein the retaining wall is arranged on a side slope and is arranged at the junction of a new filling interface and an old filling interface of the side slope, the retaining wall is arranged above the joists and is used for retaining a part of the new filling, the supporting piles are arranged below the joists, and the supporting piles extend downwards and penetrate through the old filling and a bedrock surface to enter bedrock; a plurality of anti-slide piles are driven into the old filling soil at the downstream of the side slope, the lower end parts of the anti-slide piles also extend into the bedrock, an inclined beam is connected between the top parts of the anti-slide piles and the joists, and the inclined beam is obliquely arranged along the side slope; a plurality of drain pipes are also arranged in the side slope where the inclined beam is positioned, and the drain pipes extend into the old filling soil in an inclined manner;
The support pile and the anti-slide pile are vertically arranged on the ground, the distance that the anti-slide pile stretches into the bedrock is greater than the distance that the support pile stretches into the bedrock, and the section size of the support pile is smaller than the section size of the anti-slide pile.
2. The composite pile joist retaining wall of claim 1, wherein said retaining wall is disposed directly above said joist or on a side of said joist adjacent to said fresh fill, said retaining wall having a trapezoidal cross section.
3. The composite pile joist retaining wall according to claim 1, wherein said retaining wall is one of gravity type, counter weight type and wall-supporting type, and the retaining wall bottom of said retaining wall is non-grouting reinforced foundation.
4. The composite pile joist retaining wall according to claim 1, wherein said support piles are rail piles or small section bored piles, a plurality of said support piles being arranged in a straight line.
5. The composite pile joist retaining wall of claim 1, wherein the top of said support piles are embedded a depth into said joists, the outer sides of said joists being connected to said diagonal beams.
6. The modular pile joist retaining wall of claim 1, wherein a crown beam is disposed on top of the slide resistant piles, the crown beam connecting the diagonal beams.
7. The combined pile joist retaining wall of claim 1, wherein the angle of inclination of said diagonal is 20-70 degrees, the angle of inclination of said drain pipes is less than the angle of inclination of said diagonal, a plurality of said drain pipes are all located in said old fill, said drain pipes are arranged in a quincuncial pattern.
8. The composite pile joist retaining wall of claim 1, wherein said upper horizontal portion of said new fill is provided with a pavement, and wherein said new fill, said old fill and said bedrock are further provided with vertical reinforcement assemblies therein.
9. A method of constructing a composite pile joist retaining wall according to any one of claims 1 to 8, wherein said method of construction comprises the steps of:
(1) Constructing a support pile, arranging the support pile of the pile joist retaining wall at the junction of new and old filling soil of a side slope, wherein the insertion depth of the support pile penetrates through the old filling soil and stretches into bedrock;
(2) The joist construction is carried out, the joist is arranged on the supporting pile, and the pile top of the supporting pile is embedded into the bottom of the joist;
(3) The retaining wall construction is carried out, and the retaining wall is arranged above the joist or near one side of the new filling soil;
(4) The construction of the anti-slide piles, namely driving a plurality of anti-slide piles into the downstream of the old filling soil of the side slope, enabling the anti-slide piles to penetrate through the old filling soil and be inserted into bedrock, and arranging crown beams at the pile tops of the anti-slide piles;
(5) Constructing an inclined beam, wherein one end of the inclined beam is connected with the crown beam, and the other end of the inclined beam is connected with the joist;
(6) And (3) constructing a drain pipe, and installing a plurality of inclined drain pipes in the slope surface where the inclined beam is positioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111600553.7A CN114411802B (en) | 2021-12-24 | 2021-12-24 | Combined pile joist retaining wall and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN114411802A (en) | 2022-04-29 |
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