CN112854237A - Construction method for steel sheet pile support in case of boulder - Google Patents
Construction method for steel sheet pile support in case of boulder Download PDFInfo
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- CN112854237A CN112854237A CN202110015620.2A CN202110015620A CN112854237A CN 112854237 A CN112854237 A CN 112854237A CN 202110015620 A CN202110015620 A CN 202110015620A CN 112854237 A CN112854237 A CN 112854237A
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- purlin
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention belongs to the field of foundation pit excavation support, and particularly discloses a construction method for a steel sheet pile support when encountering boulders, which comprises the steps of locking and connecting the steel sheet piles to form a support structure, wherein hard boulders are mixed in strata to influence the construction of the steel sheet piles, high-pressure rotary jet piles are adopted from the ground at the positions with boulders, steel sheet piles are adopted for other positions without boulders to be connected and supported, two I-shaped steel enclosures are erected between the steel sheet piles and the high-pressure rotary jet piles, the steel sheet piles are fixedly connected with the I-shaped steel enclosing purlins by utilizing welded corbels, anchor rods are driven into the piles through the I-shaped steel enclosing purlins to be fixed, additional steel supports are stably maintained again, the defect that the support of the steel sheet piles is not proper due to shallow buried depth when encountering boulders can be effectively overcome, the steel sheets are reserved at other positions of the high-pressure rotary jet piles, the arrangement of the pile support is small in soil discharge amount and has small influence, in addition, all parts are welded during construction, so that the operation is simple, the strength is high, and the use and the operation are safer.
Description
Technical Field
The invention belongs to the field of foundation pit excavation supporting, and particularly relates to a construction method of a steel sheet pile support in case of boulder.
Background
With the development scale of underground space in China becoming larger and larger, and the increasing of various large-scale projects such as open cut tunnels, subway stations and the like, the development of foundation pit engineering theory and technical level is greatly promoted, the construction of the foundation pit has the characteristics of uncertainty, complexity, variability, concealment and the like, the supporting construction of the foundation pit needs to ensure the safety of the whole supporting structure in the construction process and control the deformation of the supporting structure and the deformation of the surrounding soil body, and therefore the problems encountered in the excavation and supporting process of the foundation pit are increasingly wide.
Before the foundation pit is excavated, a foundation pit excavation supporting scheme is determined according to a geological survey report and the surrounding environment. When the foundation pit retaining wall is constructed, hard natural formations such as floating stones exist at the bottom of the pit, if a gravity type cement wall support is adopted or a precast pile is driven to serve as the foundation pit support, a high-pressure jet grouting pile can be adopted to connect the pile when the floating stones meet, the designed pile length is achieved, or a clay cofferdam is used for slope-releasing support around the foundation pit; when carrying out the steel sheet pile and carrying out foundation ditch support, boulder can hinder the construction of steel sheet pile, leads to the steel sheet pile can't reach the design and buries the depths, again because of steel sheet pile and high pressure jet grouting pile material attribute are different, so can not carry out the pile extension, then the foundation ditch can not obtain good safe support, consequently, how can not give up using low carbon environmental protection's steel sheet pile when meeting boulder can guarantee again that foundation ditch support safety is a key technological problem to the enterprise.
Disclosure of Invention
The invention provides a construction method for a steel sheet pile support meeting boulders, aiming at solving the defects of improper support and the like caused by shallow buried depth of the steel sheet pile meeting boulders.
The invention is realized by adopting the following technical scheme: a construction method for a steel sheet pile in case of boulders comprises the following steps:
the method comprises the following steps: according to design requirements, sequentially driving steel sheet piles into soil along the inner wall of a foundation pit and sequentially connecting the steel sheet piles, wherein the steel sheet piles are concave and convex, concrete is injected into a concave-convex gap between the steel sheet piles and the side line of the foundation pit, and detachable steel sheet piles are arranged at positions where boulders are reserved;
step two: drilling a hole at a position with boulder from the ground by adopting a down-the-hole hammer, forming the pile by utilizing high-pressure rotary spraying cement, ensuring that the pile length of the high-pressure rotary spraying pile is consistent with that of a steel sheet pile, drilling the high-pressure rotary spraying pile, enabling the connecting line of the position of a hole on the high-pressure rotary spraying pile and a preformed hole on the steel purlin to be in the direction of inserting the anchor, namely 45 degrees, and grouting the anchor rod into the hole;
step three: arranging an I-shaped steel waist beam as an enclosing purlin along the steel sheet pile from top to bottom, snapping lines up and down on the steel sheet pile by using ink lines according to the upper and lower elevations of the steel enclosing purlin, welding a bracket at the position of the ink lines, and installing the steel enclosing purlin on the bracket;
step four: the anchor rod driven into the high-pressure jet grouting pile penetrates out of the steel purlin, and a steel plate is welded at the contact position of the anchor rod and the steel purlin to fix the anchor rod and the steel purlin;
step five: welding steel web plates at the front and back of the joint of each steel purlin for connection and reinforcement, welding upper and lower triangular stiffening ribs and web plates at the outer side of the corner joint of each steel purlin for reinforcement, and filling gaps between the steel purlins and steel sheet piles with concrete;
step six: according to the dimension of measuring behind foundation ditch adds steel sheet pile and the steel purlin, hoist steel shotcrete, exert prestressing force, adopt behind the web electric welding to connect.
Further, in the first step, every two adjacent steel sheet piles are connected through a lock catch, holes are sequentially punched in the two sides of the lock catch connection position of every 10 m of steel sheet piles from top to bottom, and high-strength bolts penetrate into the holes.
Furthermore, in the second step, when a down-the-hole hammer is used for drilling, the floating stones are crushed, the long guide pipes are extended into the holes to the bottom of the holes, cement slurry is introduced through the guide pipes to condense the crushed floating stones into hard cement slurry, and then the guide pipes are withdrawn to fill the pile holes with high-pressure rotary spraying cement.
Furthermore, in the third step, the upper flange and the lower flange of the steel purlin and the web plate are in contact connection with the steel sheet pile, and the contact positions of the steel purlin and the steel sheet pile are all connected by welding seams.
Furthermore, in the third step, two layers of stiffening ribs are driven into the web plate of the steel purlin, and the bracket and the stiffening ribs are not arranged on the steel sheet pile at the boulder position.
Furthermore, in the sixth step, the steel supports are as long as the short sides of the foundation pit and are erected every 5 meters along the long side direction of the foundation pit, the steel supports are I-shaped steel with the height equal to that of the web plate of the steel enclosing purlin, the end parts of the steel supports are arranged on the steel enclosing purlin, and the end parts of the steel supports are fixed by welding.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) in the construction of the steel sheet pile support encountering the boulder, the use of the steel sheet pile is reserved, and the boulder does not need to be removed in advance, so that the problem that the steel sheet pile support cannot reach the design height when the boulder exists in the stratum soil is flexibly solved by how to support the foundation pit when the boulder exists in a small area of the stratum;
(2) the high-pressure jet grouting pile and the anchor rod support are added on the basis of the steel sheet pile, the high-pressure jet grouting pile can retain floating stones, solidify the floating stones through cement paste and reach the designed elevation as long as the steel sheet pile, the cost is low, the anchor rod, the steel sheet pile, the steel purlin and the steel support can be disassembled and recycled, and the loading, unloading and stacking are convenient;
(3) the steel sheet pile and the high-pressure jet grouting pile are easy to adjust the pile length, and the pile length can be adjusted by adopting a lengthening or cutting method according to needs; steel sheet piles are reserved at the floating stone part only by adopting other positions of the high-pressure jet grouting pile, so that compared with pile arrangement support, the soil arrangement amount is small, and the influence on adjacent buildings is small;
(4) all parts are welded, so that the method is simple to operate, high in strength, safe to use and high in practical application and popularization value.
Drawings
FIG. 1 is a schematic view of a construction process of a steel sheet pile support in the embodiment of the invention when encountering boulders;
FIG. 2 is a schematic perspective view of a supporting structure on the left side surface of a foundation pit for a steel sheet pile encountering boulders in the embodiment of the invention;
FIG. 3 is a schematic top view of a full foundation pit supporting structure for a steel sheet pile encountering boulder according to an embodiment of the present invention;
FIG. 4 is a schematic view of the connection of the steel sheet pile, the steel purlin and the steel support according to the embodiment of the invention;
FIG. 5 is a schematic view of the connection between a high-pressure jet grouting pile and a steel purlin according to an embodiment of the invention;
1. steel sheet piles; 2. high-pressure jet grouting piles; 3. an anchor rod; 4. the I-shaped steel encloses the fluid; 5. supporting steel; 6. and (4) a bracket.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and thus, the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 2-5, the construction components according to this embodiment include a steel sheet pile 1, a high-pressure jet grouting pile 2, an anchor rod 3, an i-shaped steel enclosure 4, a steel support 5 and a bracket 6, and as shown in fig. 1, a construction method for a steel sheet pile support in encountering boulders includes the following steps:
the method comprises the following steps: according to design requirements, steel sheet piles are sequentially driven into the soil along the inner wall of a foundation pit and are sequentially connected, the steel sheet piles are Larsen steel sheet piles for waterproofing of the foundation pit and preventing soil body landslide, the steel sheet pile enclosure is sequentially driven into the soil according to the side line of the foundation pit to reach a designed elevation, the steel sheet piles are concave and convex, concrete is injected into concave and convex gaps between the steel sheet piles and the side line of the foundation pit, the position of boulder is determined according to a geological survey report and actual construction detection, and detachable steel sheet piles are arranged at reserved boulder positions;
every two adjacent steel sheet piles are connected through a lock catch, holes are sequentially punched in the two sides of the lock catch connection position every 10 m of steel sheet piles from top to bottom, and high-strength bolts penetrate into the holes;
step two: drilling a hole at a position with boulders from the ground by adopting a down-the-hole hammer, forming a pile (a high-pressure rotary spraying pile) by utilizing high-pressure rotary spraying cement, crushing the boulders by using the down-the-hole hammer during drilling, extending a long guide pipe into the hole to the bottom of the hole, introducing cement slurry through the guide pipe to condense the crushed boulders into hard cement slurry, withdrawing the guide pipe, filling the pile hole with the high-pressure rotary spraying cement, and ensuring that the pile length of the high-pressure rotary spraying pile is consistent with that of a steel plate pile; removing a steel sheet pile preset at the boulder part, determining the position of a reserved hole of the steel purlin to mark, drilling a hole in the high-pressure jet grouting pile, and grouting after inserting an anchor rod into the hole;
step three: arranging transverse steel enclosing purlins for preventing the steel sheet pile enclosing barrier from side turning over along the steel sheet pile from top to bottom, arranging two I-shaped steel waist beams as the enclosing purlins in the embodiment, connecting the upper flange and the lower flange of the I-shaped steel and a web plate with the steel sheet pile in a contact manner, connecting the steel enclosing purlins with the steel sheet pile in a welding seam manner, using ink lines to bounce up and down the steel sheet pile according to the upper elevation and the lower elevation of the steel enclosing purlins, welding brackets at the positions of the ink lines, welding oblique bracket supporting steel sheet piles up and down at every 5 meters of steel sheet pile, installing the steel enclosing purlins on the brackets, driving two layers of stiffening ribs into the web plate of the steel enclosing purlins, and setting the brackets and the stiffening ribs on;
step four: the anchor rod driven into the high-pressure jet grouting pile penetrates out of the steel purlin, a steel plate is welded at the contact position of the anchor rod and the steel purlin, and the anchor rod and the steel purlin are fixed;
in the embodiment, every 5 m of the frame along the long side direction of the foundation pit is provided with a steel support 5 which is as long as the short side of the foundation pit, the steel support is I-shaped steel with the height equal to the height of a web plate of the steel purlin, the end part of the steel support is arranged on the steel purlin, and the end part of the steel support is fixed by welding; dismantling a steel sheet pile at the boulder position, penetrating an anchor rod through a high-pressure jet grouting pile and a reserved hole of a steel purlin, wherein the anchor rod is a self-locking anchor rod, the reserved hole at the steel purlin position is positioned in the center of a web, the reserved hole of the high-pressure jet grouting pile is flush with the lower flange of the steel purlin, the reserved hole far away from the side line of the foundation pit is half as long as the lower flange of the steel purlin and is lower than the lower flange of the steel purlin, and welding a steel plate at a contact position for fixing after the anchor rod penetrates out of the steel purlin;
step five: the joint of each steel purlin is welded with steel web plates for connection and reinforcement, the outer side of the corner joint of each steel purlin is welded with an upper triangular stiffening rib and a lower triangular stiffening rib for reinforcement and web plate reinforcement, and the gap between each steel purlin and the Larsen steel plate is filled with C20 concrete;
step six: according to the dimension of measuring behind foundation ditch adds steel sheet pile and the steel purlin, hoist steel shotcrete, exert prestressing force, adopt behind the web electric welding to connect.
In this implementation, carry out fore shaft with the steel sheet pile and connect formation supporting construction, because mix with hard boulder in the stratum and influence the construction of steel sheet pile, it adopts high-pressure jet grouting pile from ground to have boulder position, other positions that do not have boulder adopt the steel sheet pile to connect to strut, it is long-standing for the spring in two channel I-shaped steel is erect at steel sheet pile and high-pressure jet grouting pile middle part and encloses the purlin, it is fixed to utilize the welding bracket to enclose the purlin with the steel sheet pile, it fixes in the purlin is driven into the stake to pass the I-shaped steel with the stock, additional steel shotcrete is gone on once more and is maintained steadily, can effectively overcome the steel sheet pile because meet boulder and the buried depth is shone and.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (6)
1. A construction method for a steel sheet pile in case of boulders is characterized by comprising the following steps:
the method comprises the following steps: according to design requirements, sequentially driving steel sheet piles into soil along the inner wall of a foundation pit and sequentially connecting the steel sheet piles, wherein the steel sheet piles are concave and convex, concrete is injected into a concave-convex gap between the steel sheet piles and the side line of the foundation pit, and detachable steel sheet piles are arranged at positions where boulders are reserved;
step two: drilling a hole from the ground at the position with the floating stone by adopting a down-the-hole hammer, forming the pile by utilizing high-pressure rotary spraying cement, ensuring that the pile length of the high-pressure rotary spraying pile is consistent with that of a steel sheet pile, drilling the high-pressure rotary spraying pile according to the anchor inserting direction, enabling the position of a hole on the high-pressure rotary spraying pile and the connecting line of a preformed hole on the steel purlin to be in the anchor inserting direction, and grouting the anchor rod into the hole;
step three: arranging an I-shaped steel waist beam as an enclosing purlin along the steel sheet pile from top to bottom, snapping lines up and down on the steel sheet pile by using ink lines according to the upper and lower elevations of the steel enclosing purlin, welding a bracket at the position of the ink lines, and installing the steel enclosing purlin on the bracket;
step four: the anchor rod driven into the high-pressure jet grouting pile penetrates out of the steel purlin, and a steel plate is welded at the contact position of the anchor rod and the steel purlin to fix the anchor rod and the steel purlin;
step five: welding steel web plates at the front and back of the joint of each steel purlin for connection and reinforcement, welding upper and lower triangular stiffening ribs and web plates at the outer side of the corner joint of each steel purlin for reinforcement, and filling gaps between the steel purlins and steel sheet piles with concrete;
step six: according to the dimension of measuring behind foundation ditch adds steel sheet pile and the steel purlin, hoist steel shotcrete, exert prestressing force, adopt behind the web electric welding to connect.
2. The construction method of the steel sheet pile in the case of floating stones according to claim 1, wherein in the first step, every two adjacent steel sheet piles are connected through a lock catch, holes are sequentially drilled in the two sides of the lock catch connection part from top to bottom every 10 m of the steel sheet piles, and high-strength bolts are inserted into the holes.
3. The construction method of the steel sheet pile encountering floating stones according to claim 1, wherein in the second step, when a down-the-hole hammer is used for drilling, the floating stones are crushed, long ducts are extended into the holes to the bottom of the holes, cement slurry is introduced through the ducts to coagulate the crushed floating stones into hard cement slurry, and then the ducts are withdrawn to fill the pile holes with high-pressure rotary spraying cement.
4. The construction method of the steel sheet pile in the presence of the boulder as claimed in claim 1, wherein in the third step, the upper and lower flanges and the web of the steel purlin are connected with the steel sheet pile in a contact manner, and the contact portions of the steel purlin and the steel sheet pile are connected by welding seams.
5. The construction method of the steel sheet pile meeting the boulder as claimed in claim 4, wherein in the third step, two layers of stiffening ribs are driven into the web of the steel purlin, and the bracket and the stiffening ribs are not arranged on the steel sheet pile at the boulder.
6. The construction method of the steel sheet pile in the case of boulders according to claim 1, wherein in the sixth step, the steel supports are as long as the short sides of the foundation pit and are erected every 5 meters in the long side direction of the foundation pit, the steel supports are i-shaped steel as high as the web plate of the steel purlin, the end parts of the i-shaped steel supports are placed on the steel purlin, and the end parts of the steel supports are fixed by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110015620.2A CN112854237B (en) | 2021-01-07 | 2021-01-07 | Construction method for steel sheet pile support in case of boulder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110015620.2A CN112854237B (en) | 2021-01-07 | 2021-01-07 | Construction method for steel sheet pile support in case of boulder |
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| CN112854237A true CN112854237A (en) | 2021-05-28 |
| CN112854237B CN112854237B (en) | 2022-11-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150197895A1 (en) * | 2012-07-17 | 2015-07-16 | Council Of Scientific & Industrial Research | Stepwise repeated destabilization and stabilization of highly collapsible soil mass by 'soil nailing technique' used for construction of railway/road underpass |
| CN105569051A (en) * | 2015-12-31 | 2016-05-11 | 中铁二局集团有限公司 | Foundation pit support system of sandy pebble boulder geological stratification and construction method |
| CN111270679A (en) * | 2020-03-18 | 2020-06-12 | 长江勘测规划设计研究有限责任公司 | Construction method and structure of foundation pit fender pile opening excavation processing structure |
| CN211368741U (en) * | 2019-12-06 | 2020-08-28 | 马鞍山钢铁建设集团有限公司 | Supporting system in fine sand stratum of Yangtze river coastline |
| CN111997062A (en) * | 2020-08-11 | 2020-11-27 | 中交二公局第四工程有限公司 | Method for treating support deviation of steel sheet pile in coastal soft soil deep foundation pit |
-
2021
- 2021-01-07 CN CN202110015620.2A patent/CN112854237B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150197895A1 (en) * | 2012-07-17 | 2015-07-16 | Council Of Scientific & Industrial Research | Stepwise repeated destabilization and stabilization of highly collapsible soil mass by 'soil nailing technique' used for construction of railway/road underpass |
| CN105569051A (en) * | 2015-12-31 | 2016-05-11 | 中铁二局集团有限公司 | Foundation pit support system of sandy pebble boulder geological stratification and construction method |
| CN211368741U (en) * | 2019-12-06 | 2020-08-28 | 马鞍山钢铁建设集团有限公司 | Supporting system in fine sand stratum of Yangtze river coastline |
| CN111270679A (en) * | 2020-03-18 | 2020-06-12 | 长江勘测规划设计研究有限责任公司 | Construction method and structure of foundation pit fender pile opening excavation processing structure |
| CN111997062A (en) * | 2020-08-11 | 2020-11-27 | 中交二公局第四工程有限公司 | Method for treating support deviation of steel sheet pile in coastal soft soil deep foundation pit |
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| CN112854237B (en) | 2022-11-22 |
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