CN114411802A - Combined pile-joist retaining wall and construction method - Google Patents
Combined pile-joist retaining wall and construction method Download PDFInfo
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- CN114411802A CN114411802A CN202111600553.7A CN202111600553A CN114411802A CN 114411802 A CN114411802 A CN 114411802A CN 202111600553 A CN202111600553 A CN 202111600553A CN 114411802 A CN114411802 A CN 114411802A
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 239000002689 soil Substances 0.000 claims abstract description 36
- 239000011435 rock Substances 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 10
- 230000002349 favourable effect Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000670 limiting effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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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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Abstract
The invention discloses a combined pile joist retaining wall and a construction method thereof, wherein the retaining wall comprises a retaining wall body, a joist and support piles, the support piles are arranged below the joist, and the support piles extend downwards and penetrate through old filling soil and a bedrock surface to enter a bedrock; a plurality of slide-resistant piles are driven into the lower portion of the side slope, the lower end portions of the slide-resistant piles also extend into the bedrock, an oblique beam is connected between the top of each slide-resistant pile and the corresponding joist, the oblique beam is obliquely arranged along the side slope, and a plurality of drain pipes are arranged in the side slope where the oblique beam is located; this combination formula stake joist retaining wall is through rational arrangement the support pile with the joist can reduce the retaining wall length of stake cross-sectional dimension and stake down, turns into the ground measure construction with most underground work load, has practiced thrift construction period, and the construction is safer, and slope middle part excavation face reduces more to be favorable to the slope stability in the work progress.
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 thereof.
Background
The pile joist retaining wall is a composite retaining structure consisting of piles, joists and retaining walls, and has the main working principle that the load transmitted from the retaining wall on the upper part of the joists is transmitted to the piles through the joists, then the load is transmitted to the soil layer through the frictional resistance of the soil around the piles and the supporting force of the soil at the ends of the piles, and the joists connect the piles into a whole to jointly bear the load. The pile joist retaining wall can be divided into the following parts according to the structural form: the retaining wall comprises a single-row pile-supporting-beam retaining wall (a weight-balancing type and a gravity type), a multi-row pile-supporting-beam retaining wall (a weight-balancing type and a gravity type), and an anchor cable (rod) pile-supporting-beam retaining wall (a weight-balancing type and a gravity type).
For example, in 2018 of the application of the Chinese patent application (publication No. CN107675724A), a small-sized anti-slide pile group joist retaining wall structure and a construction method thereof are disclosed, wherein a retaining wall foundation is arranged on a joist, the joist is arranged on the top of a small-sized anti-slide pile group and an excavation platform of a steep slope section, an anchor rope is arranged at the intersection of the joist and the small-sized anti-slide pile group, the outer end of the anchor rope is anchored at the outer side of the joist, the inner end of the anchor rope is anchored in a stable soil layer or a bed rock of the steep slope section, and the lower end of the small-sized anti-slide pile group is anchored into the stable soil layer of the slope section of the steep slope section for enough length. The construction method comprises the following steps: leveling field → constructing small-sized anti-slide piles → constructing anchor cables → constructing joist → pouring (building) retaining wall → backfilling retaining wall back filler and compacting layer by layer. The construction of the small-sized anti-slide pile group and the anchor cable needs larger underground construction amount.
The pile-supporting beam retaining wall expands the application range of general masonry retaining walls, and when the ground surface is steep and the earth surface is thick, the supporting form of the pile-supporting wall is adopted, so that the base can be placed in a stable ground layer, and the section of the retaining wall can be saved. In high fill areas, piles are required to simultaneously bear vertical forces from the upper retaining wall and horizontal thrust from the fill slope, often due to steep terrain. At the moment, in order to meet the engineering requirements, the section size of the pile is large, and if the manual hole digging pile is adopted, the construction difficulty is large, the cost is high, and the construction period is long. If the retaining wall is deeply filled or the construction site is limited, the construction of the cast-in-situ bored pile is difficult.
Disclosure of Invention
The invention aims to provide a combined pile-joist retaining wall and a construction method thereof, aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a combined type 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, a joist and support piles, the joist is arranged at the intersection of the interfaces of new filling and old filling of the side slope, the retaining wall is arranged above the joist and used for blocking part of the new filling, the support piles are arranged below the joist, and the support piles extend downwards and penetrate through the old filling and a bed rock surface to enter a bed rock; 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, and an inclined beam is connected between the top of each anti-slide pile and the joist and is obliquely arranged along the side slope; and a plurality of drainage pipes are also arranged in the side slope where the oblique beam is positioned, and the drainage pipes extend into the old filling soil in an inclined mode.
This combination formula stake joist retaining wall is through rational arrangement the support pile with the joist can reduce the retaining wall length of stake cross-sectional dimension and stake down, turns into the ground measure construction with most underground work load, has practiced thrift construction period, and the construction is safer, and slope middle part excavation face reduces more to be favorable to the slope stability in the work progress.
Compare with current barricade bottom single row pile, no matter be on the construction volume or on the security, this stake joist retaining wall all has obvious advantage, can reduce the cross-sectional dimension and the length of pile body by a wide margin, has reduced the volume of punching and the construction degree of difficulty.
When the covering layer on the lower part of the retaining wall is deep, the arrangement of the oblique beams transmits the gliding force of a part of soil body to the anti-slide pile on the lower part, and the pile body does not need to be additionally arranged in old filling soil, so that the workload below the ground can be reduced compared with a manual hole digging pile, the construction period can be shortened, and the construction is safer and more economic. After the structure is adopted, the excavation surface of old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope can be favorably maintained.
The pile joist retaining wall of modular also convenient and fast more when the construction, joist and support pile can make respectively and install in proper order, then the construction the retaining wall, the setting of joist can be used for transmitting moment of flexure and the power that the retaining wall transmitted, and will pass through power the sloping transmits extremely the friction pile, because the friction pile has better cling compound effect, dispersion that can be fine and share the atress, alleviates the retaining wall with the atress of support pile, when keeping side slope stability, also need not set up longer thicker the support pile reduces the underground construction volume.
The anti-slide pile and the supporting pile are deep into the bedrock and can conduct stress to the bedrock, so that the burden of a new and old filling layer is reduced, and the stability of the new and old filling is ensured.
Furthermore, the retaining wall is arranged right above the joist or is arranged on the side edge of the joist close to the new filling soil, and the cross section of the retaining wall is trapezoidal.
Furthermore, retaining wall is one of gravity type, weighing type, counterfort, the retaining wall bottom of retaining wall adopts non-slip casting to consolidate the ground. The foundation is reinforced without grouting at the bottom of the retaining wall, so that the condition that the side slope is unstable due to plugging of underground water drainage channels in the side slope is avoided.
Further, support the stake with the equal vertical perpendicular ground setting of slide-resistant pile, slide-resistant pile stretches into the distance of basement rock is greater than support the stake and stretches into the distance of basement rock, the cross sectional dimension of support the stake is less than slide-resistant pile's cross sectional dimension.
Furthermore, the supporting piles are steel rail piles or small-section cast-in-situ bored piles, the supporting piles are arranged in a straight line, and the supporting piles adopting the arrangement structure are simple to operate, easy to construct and capable of horizontally and stably supporting the joist.
Furthermore, the top of the supporting pile is embedded into a section of the joist, and the outer side of the joist is connected with the oblique 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 motion 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 connected with the oblique beam. The arrangement of the crown beam is convenient for connecting the oblique beam, and the stress of the slide-resistant pile is improved.
Furthermore, the inclination angle of sloping is at 20 ~ 70 degrees, the inclination of drain pipe is less than the inclination of sloping, and a plurality of the drain pipe all is located in the old back fill, the drain pipe is arranged according to the quincunx.
The inclined water discharge pipe is convenient for water discharge in the filling soil, meanwhile, the water discharge pipe can also play a supporting and connecting role in old filling soil, and the inclination of the water discharge pipe is smaller than the inclination angle of the oblique beam, so that the oblique water discharge pipe can be obliquely exposed from the slope where the oblique beam is located.
Furthermore, the horizontal part in the top of newly filling up sets up the road surface, newly fill up, old fill up with still be equipped with vertical reinforcement assembly in the bedrock to promote holistic joint strength and stability.
Further, a construction method of the combined type pile joist retaining wall comprises the following steps:
(1) constructing support piles, namely arranging the support piles of the pile joist retaining wall at the intersection of new and old filling soil of the side slope, wherein the insertion depth of the support piles penetrates through the old filling soil and extends into bedrock;
(2) constructing a joist, namely arranging the joist on the support pile, and embedding the pile top of the support pile into the bottom of the joist by a certain depth;
(3) constructing a retaining wall, wherein the retaining wall is arranged above the joist or on one side close to the newly filled soil;
(4) constructing anti-slide piles, namely driving a plurality of anti-slide piles into the downstream of the old filling of the side slope, penetrating the anti-slide piles through the old filling and inserting the anti-slide piles into the bedrock, and arranging crown beams on the pile tops of the anti-slide piles;
(5) constructing an oblique beam, wherein one end of the oblique beam is connected with the crown beam, and the other end of the oblique beam is connected with the joist;
(6) and (5) drain pipe construction, wherein a plurality of inclined drain pipes are arranged in the slope where the oblique beam is positioned.
By adopting the method for construction, the construction amount of the underground part is smaller, the excavation amount of old filled soil in the middle of the side slope is also smaller, the stability of the slope surface is favorably kept, 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 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, convert most underground workload into ground measures for construction, save the construction period, ensure safer construction, reduce the excavation surface in the middle of the side slope in the construction process and be more beneficial to the stability of the side slope; 2. compared with the single-row pile at the bottom of the existing retaining wall, the pile joist retaining wall has obvious advantages in construction amount and safety, can greatly reduce the section size and length of a pile body, and reduces the punching amount and the construction difficulty; 3. when the covering layer on the lower part of the retaining wall is deep, the arrangement of the oblique beams transmits the gliding force of a part of soil body to the anti-slide pile on the lower part, and compared with a manual hole digging pile, the underground workload can be reduced, the construction period can be shortened, and the construction is safer and more economical; 4. after the structure is adopted, the excavation surface of old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope can be favorably maintained; 5. the arrangement of the joists can be used for transmitting bending moment and force transmitted by the retaining wall, and transmitting the force to the anti-sliding piles through the inclined beams, so that the stress can be well dispersed and shared, and the stress of the retaining wall and the supporting piles is reduced; 6. and grouting is not adopted at the bottom of the retaining wall to reinforce the foundation, so that the condition that the slope is unstable due to plugging of the underground water drainage channel in the slope is avoided.
Drawings
FIG. 1 is a schematic structural view of a pile joist retaining wall of the present invention;
FIG. 2 is a schematic view of a retaining wall with a combined type pile-supporting beam of the present invention installed on a slope;
fig. 3 is a schematic view illustrating a structure of a retaining wall of a modular pile-supporting beam according to another embodiment of the present invention, which is installed on a side slope;
in the figure: 1. newly filling soil; 2. pile joist retaining wall; 201. a retaining wall; 202. a joist; 203. supporting piles; 3. an oblique beam; 4. a drain pipe; 5. anti-slide piles; 6. a pavement; 7. an old fill interface; 8. a bedrock face.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, a combined pile joist retaining wall comprises a pile joist retaining wall 2 arranged on a slope, wherein the pile joist retaining wall 2 comprises a retaining wall 201, joists 202 and support piles 203, the joists 202 are arranged at the intersection of a new filling 1 and an old filling interface 7 of the slope, the retaining wall 201 is arranged above the joists 202 and used for blocking a part of the new filling 1, the support piles 203 are arranged below the joists 202, and the support piles 203 extend downwards and penetrate through the old filling and a base rock surface 8 to enter a base rock; a plurality of anti-slide piles 5 are also 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 connected between the top of each anti-slide pile 5 and the joist 202, and the inclined beam 3 is obliquely arranged along the side slope; and a plurality of drain pipes 4 are also arranged in the side slope where the oblique beam 3 is positioned, and the drain pipes 4 obliquely extend into the old filling soil.
This combination formula stake joist retaining wall is through rational arrangement the support pile 203 with the joist 202, the length of stake cross-sectional dimension and stake under the retaining wall can be reduced, turns into the ground measure construction with most underground work load, has practiced thrift construction period, and the construction is safer, and slope middle part excavation face reduces more to be favorable to the slope stability in the work progress.
Compare with current barricade bottom single row pile, no matter be on the construction volume or on the security, this stake joist retaining wall all has obvious advantage, can reduce the cross-sectional dimension and the length of pile body by a wide margin, has reduced the volume of punching and the construction degree of difficulty.
When the covering layer on the lower part of the retaining wall is deep, the arrangement of the oblique beams 3 transfers the gliding force of a part of soil body to the anti-slide pile 5 on the lower part, and a pile body is not needed to be additionally arranged in old filling soil, so that the workload below the ground can be reduced compared with a manual hole digging pile, the construction period can be shortened, and the construction is safer and more economic. After the structure is adopted, the excavation surface of old filling soil in the middle of the side slope can be obviously reduced, and the stability of the side slope can be favorably maintained.
The combined pile joist retaining wall 2 is more convenient and faster in construction, the joist 202 and the support pile 203 can be respectively manufactured and sequentially installed, and then the retaining wall 201 is constructed, the setting of the joist 202 can be used for transmitting the bending moment and the force transmitted by the retaining wall 201, and the force is transmitted to the slide-resistant pile 5 through the inclined beam 3, because the slide-resistant pile has better anti-sliding effect, can be well dispersed and share the stress, and reduce the stress of the retaining wall 201 and the support pile 203, and when the slope stability is maintained, the support pile is not required to be longer and thicker, and the underground construction amount is reduced.
The anti-slide piles 5 and the supporting piles 203 are 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 is ensured.
Further, the retaining wall 201 is disposed right above the joist 202, and the cross section of the retaining wall 201 is trapezoidal.
Further, retaining wall 201 is one of gravity type, weighing type, counterfort, the retaining wall base of retaining wall 201 adopts non-slip casting to consolidate the ground. The foundation is reinforced without grouting at the bottom of the retaining wall, so that the condition that the side slope is unstable due to plugging of underground water drainage channels in the side slope is avoided.
Further, the support piles 203 and the slide-resistant piles 5 are vertically arranged on the ground, the distance that the slide-resistant piles 5 stretch into the bedrock is larger than the distance that the support piles 203 stretch into the bedrock, and the section sizes of the support piles 203 are smaller than the section sizes of the slide-resistant piles 5.
Furthermore, the support piles 203 are small-section cast-in-place piles, a plurality of the support piles 203 are arranged in a slope in a straight line, and the support piles adopting the arrangement structure are simple to operate, easy to construct and capable of horizontally and stably supporting the joist 202.
Further, the top of the supporting pile 203 is embedded into the joist 202 for 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 for a certain depth, so that the connection strength can be improved, a good limiting effect can be 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 connected with the oblique beam 3. The arrangement of the crown beam is convenient for connecting the oblique beam 3, and the stress of the slide-resistant pile is improved.
Further, the inclination angle of sloping 3 is at 20 ~ 45 degrees, the inclination of drain pipe 4 is less than the inclination of sloping 3, and a plurality of drain pipe 4 all is located in the old back fill, drain pipe 4 arranges according to the quincunx in domatic.
The arrangement of the oblique water discharge pipe 4 facilitates water discharge in the filled soil, meanwhile, the water discharge pipe 4 can also play a role in supporting and connecting the old filled soil, and the inclination of the oblique water discharge pipe is smaller than the inclination angle of the oblique beam, so that the oblique water discharge pipe can be obliquely exposed from the slope where the oblique beam is located.
Furthermore, the horizontal part of the upper part of the new filling 1 is provided with a road surface 6, and the new filling 1, the old filling and the bedrock are internally provided with a vertical reinforcing component to improve the overall connection strength and stability.
Example two:
the embodiment provides a construction method of a combined type pile-joist retaining wall, which comprises the following steps:
(1) constructing support piles 203, arranging the support piles 203 of the pile joist retaining wall at the intersection of new and old filling soil of a side slope, and enabling the insertion depth of the support piles 203 to penetrate through the old filling soil and extend into bedrock;
(2) constructing a joist 202, arranging the joist 202 on the support piles 203, and embedding the pile tops of the support piles 203 into the bottom of the joist 202 for a certain depth;
(3) constructing a retaining wall 201, and arranging the retaining wall 201 above the joist 202;
(4) constructing anti-slide piles 5, driving a plurality of anti-slide piles 5 at the downstream of the old filling of the side slope, penetrating the anti-slide piles 5 through the old filling and inserting the anti-slide piles 5 into bedrock, and arranging crown beams at the pile tops of the anti-slide piles 5;
(5) constructing an oblique beam 3, wherein one end of the oblique beam 3 is connected with the crown beam, and the other end of the oblique beam 3 is connected with the joist 202;
(6) and (4) constructing the drain pipe 4, and installing a plurality of oblique drain pipes 4 in the slope where the oblique beam 3 is located.
By adopting the method for construction, the construction amount of the underground part is smaller, the excavation amount of old filled soil in the middle of the side slope is also smaller, the stability of the slope surface is favorably kept, 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.
Example three:
the embodiment provides a combined pile-joist retaining wall and a construction method, the method is used for the emergency treatment project of unstable slope at the later stage of the retaining wall, and the construction steps are as follows with reference to fig. 3:
(1) constructing a support pile 203 below the outer side of the retaining wall constructed in advance;
(2) arranging a joist 202 on a support pile 203 which is constructed, embedding the pile top of the support pile 203 into the joist 202 for a certain depth, and enabling the joist 202 to horizontally abut against the bottom of the outer side of the retaining wall 201;
(3) constructing anti-slide piles 5, driving a plurality of anti-slide piles 5 at the downstream of the old filling of the side slope, penetrating the anti-slide piles 5 through the old filling and inserting the anti-slide piles 5 into bedrock, and arranging crown beams at the pile tops of the anti-slide piles 5;
(4) constructing an oblique beam 3, wherein one end of the oblique beam 3 is connected with the crown beam, and the other end of the oblique beam 3 is connected with the joist 202;
(5) and (4) constructing the drain pipe 4, arranging a drain hole in the slope surface where the oblique beam 3 is positioned, and installing a plurality of oblique drain pipes 4 in the drain hole.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A combined type pile joist retaining wall comprises a pile joist retaining wall arranged on a side slope, and is characterized in that the pile joist retaining wall comprises a retaining wall, joists and support piles, the joists are arranged at the intersection of the interfaces of new filling and old filling of the side slope, the retaining wall is arranged above the joists and used for blocking part of the new filling, the support piles are arranged below the joists, and the support piles extend downwards and penetrate through the old filling and a bed rock surface to enter a bed rock; 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, and an inclined beam is connected between the top of each anti-slide pile and the joist and is obliquely arranged along the side slope; and a plurality of drainage pipes are also arranged in the side slope where the oblique beam is positioned, and the drainage pipes extend into the old filling soil in an inclined mode.
2. A modular pile joist retaining wall as claimed in claim 1, wherein the retaining wall is disposed directly above the joists or on the sides of the joists adjacent to the new fill, the retaining wall being trapezoidal in cross-section.
3. A modular pile-joist retaining wall as claimed in claim 1, wherein the retaining wall is one of gravity, counterweight and counterfort, and the retaining wall has a bottom reinforced with non-grouting.
4. A modular pile-joist retaining wall according to claim 1, wherein the support piles and the slide-resistant piles are vertically arranged perpendicular to the ground, the distance that the slide-resistant piles extend into the bedrock is greater than the distance that the support piles extend into the bedrock, and the cross-sectional dimensions of the support piles are smaller than the cross-sectional dimensions of the slide-resistant piles.
5. A modular pile-joist retaining wall according to claim 1, wherein the support piles are rail piles or small-section bored piles, a plurality of the support piles being laid out in a line.
6. A modular pile joist retaining wall as claimed in claim 1, wherein the top of the support piles are embedded in a section of the joist and the outer side of the joist is connected to the inclined beams.
7. A modular pile-joist retaining wall according to claim 1, characterised in that a crown beam is arranged on top of the slide-resistant piles, the crown beam connecting the oblique beams.
8. A combined pile-joist retaining wall according to claim 1, characterized in that the inclination angle of the sloping beam is 20-70 degrees, the inclination angle of the drainage pipe is smaller than that of the sloping beam, a plurality of drainage pipes are all located in the old fill, and the drainage pipes are arranged in a quincunx shape.
9. A modular pile-joist retaining wall according to claim 1, characterised in that the horizontal portion above the new fill is provided with a road surface and vertical reinforcement members are provided in the new fill, the old fill and the bedrock.
10. A method for constructing a modular pile-joist retaining wall according to any one of claims 1 to 9, comprising the steps of:
(1) constructing support piles, namely arranging the support piles of the pile joist retaining wall at the intersection of new and old filling soil of the side slope, wherein the insertion depth of the support piles penetrates through the old filling soil and extends into bedrock;
(2) constructing a joist, arranging the joist on the support pile, and embedding the pile top of the support pile into the bottom of the joist;
(3) constructing a retaining wall, wherein the retaining wall is arranged above the joist or on one side close to the newly filled soil;
(4) constructing anti-slide piles, namely driving a plurality of anti-slide piles into the downstream of the old filling of the side slope, penetrating the anti-slide piles through the old filling and inserting the anti-slide piles into the bedrock, and arranging crown beams on the pile tops of the anti-slide piles;
(5) constructing an oblique beam, wherein one end of the oblique beam is connected with the crown beam, and the other end of the oblique beam is connected with the joist;
(6) and (5) drain pipe construction, wherein a plurality of inclined drain pipes are arranged in the slope where the oblique beam is positioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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