CN110700278A - Inner support structure, foundation pit support system and construction method thereof - Google Patents
Inner support structure, foundation pit support system and construction method thereof Download PDFInfo
- Publication number
- CN110700278A CN110700278A CN201911035288.5A CN201911035288A CN110700278A CN 110700278 A CN110700278 A CN 110700278A CN 201911035288 A CN201911035288 A CN 201911035288A CN 110700278 A CN110700278 A CN 110700278A
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- steel pipe
- grouting
- foundation pit
- rubber body
- hollow rubber
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
Abstract
The invention provides an inner support structure, a foundation pit support system and a construction method thereof, wherein the inner support structure comprises a steel pipe and at least two bags which are fixedly sleeved on the outer side of the steel pipe, holes are formed in the wall of a preset section of the steel pipe, the preset section of part of the steel pipe is covered by the bags, and cement slurry is poured into a gap between each bag and the steel pipe, so that the bearing capacity and the section rigidity of the steel pipe are effectively improved, and the requirement of a subsequent support system on the support rigidity is met. Therefore, when the internal support structure is used for construction of an enclosure system, the whole construction process is simple, the input materials are less, and compared with the traditional enclosure system which needs to adopt a filling pile, a waterproof curtain and a concrete horizontal support or a steel support, the construction cost is greatly reduced, and the construction period is shortened.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to an inner supporting structure, a foundation pit enclosure system and a construction method thereof.
Background
With the increasing number of layers of modern buildings, the demand of corresponding matched parking facilities and underground use spaces is increased, so that the situation of seeking space for underground development is bound, the deep foundation pit supporting technology is greatly developed, and various deep foundation pit supporting technologies are developed. The situation that the land is in shortage in urban areas and the surrounding is provided with more structures occurs, the traditional enclosure system cannot meet the requirements of the construction site, and other enclosure systems such as underground continuous walls and the like need to adopt cast-in-place piles, water-stop curtains and concrete horizontal supports or steel supports, so that the problems of high construction cost, long construction period and large adverse effect on the environment generally exist.
Aiming at the defects of the enclosure system of the inner support of the foundation pit in the prior art, the technical personnel in the field are always searching for a solution.
Disclosure of Invention
The invention aims to provide an inner support structure, a foundation pit enclosure system and a construction method thereof, and aims to solve the problems that in the prior art, the cost of the inner support enclosure system is high and the construction period is long.
In order to solve the above technical problem, the present invention provides an inner support structure, including: the steel pipe and at least two bags are fixedly sleeved on the outer side of the steel pipe, wherein holes are formed in the wall of a preset section of the steel pipe, part of the preset section of the steel pipe is covered by the bags, and cement slurry is poured into the gap between each bag and the steel pipe.
Optionally, in the inner support structure, the number of the pockets is two, the distance between the two pockets ranges from 1950mm to 2050mm, and the length of the pocket ranges from 5950mm to 6050 mm.
Optionally, in the internal support structure, the lumens of the partial sections of the steel pipes are filled with crushed stones, and the lumens of the remaining sections of the steel pipes are filled with cement paste.
Optionally, the inner support structure further includes a plurality of anchor ears, and the anchor ears fix the bladder on the steel tube.
The invention also provides a foundation pit bracing system, which comprises: the foundation pit supporting structure comprises a foundation pit and the inner supporting structure arranged on the inner side of the foundation pit, wherein the inner supporting structure supports the foundation pit in an inclined supporting mode.
Optionally, in the foundation pit support system, the preset section of the steel pipe in the inner support structure is located at a part below a foundation pit bottom plate.
Optionally, in the foundation pit enclosure system, the bladder in the inner support structure is arranged at the bottom of the steel pipe, and the bottom of the steel pipe is a critical foundation pit bottom plate.
The invention also provides a construction method of the foundation pit enclosure system, which comprises the following steps:
carrying out field leveling treatment;
excavating a groove;
pile position measuring and placing;
the inner support structure is arranged on the inner side of the foundation pit in an inclined support mode;
and processing the connecting node of the steel pipe and the ring beam in the inner support structure, and pouring the ring beam to form an enclosure system.
Optionally, in the construction method of the foundation pit support system, in the process of arranging the inner support structure at the inner side of the foundation pit in an inclined strut manner, the method includes the following steps:
pressing a processed steel pipe into soil by adopting a vibration machine, wherein the processed steel pipe is a steel pipe which is provided with a hole on a preset section and is fixedly sleeved with a bag on the outer side;
placing a grouting tool on the inner side of the steel pipe to perform segmented grouting on the part of the steel pipe sleeved and fixed with the bag on the outer side until cement slurry is poured into gaps between all bags and the steel pipe;
after the cement slurry poured into the gap between the bag and the steel pipe is hardened to a preset strength, removing the grouting tool;
filling the lumen of a partial section of steel pipe with graded crushed stone and grouting the lumen of the remaining section of said steel pipe with cement slurry.
Optionally, in the construction method of the foundation pit enclosure system, the grouting tool includes: the grouting device comprises a first hollow rubber body, a second hollow rubber body, a first inflation and deflation pipe communicated with the first hollow rubber body, a second inflation and deflation pipe communicated with the second hollow rubber body, an air pump connected with the first inflation and deflation pipe and a grouting pipe penetrating through the first hollow rubber body and communicated with the second hollow rubber body, wherein the grouting pipe comprises an open hole section, and the open hole section is a grouting pipe distributed between the first hollow rubber body and the second hollow rubber body;
the grouting tool is placed on the inner side of the steel pipe, and the process of performing segmented grouting on the steel pipe sleeved and fixed with the bag on the outer side comprises the following steps:
s421: placing the opening section of the grouting pipe in the grouting tool into the inner side of the steel pipe between any two adjacent hoops on the bag;
s422: inflating the first hollow rubber body and the second hollow rubber body by using an air pump so as to enable the first hollow rubber body and the second hollow rubber body to be attached to the outer side steel pipe walls after the volumes of the first hollow rubber body and the second hollow rubber body are expanded;
s423: grouting by using a grouting pipe, wherein the grouting slurry is diffused into the bag outside the steel pipe through the holes on the opening section of the grouting pipe and the holes on the steel pipe so as to complete grouting of the gap between the bag between two adjacent anchor ears and the steel pipe;
s424: and repeating S421 to S423 until the gaps between the steel pipes and the sacks between every two adjacent hoops are grouted.
The beneficial effects of the invention are as follows: the construction of the enclosure system is carried out by adopting the internal support structure, only grouting is needed in the gap between the bag and the steel pipe, the whole construction process is simple, the input materials are less, and compared with the traditional enclosure system which needs to adopt a cast-in-place pile, a waterproof curtain and a concrete horizontal support or a steel support, the construction cost is greatly reduced, and the construction period is shortened.
Drawings
FIG. 1 is a schematic view of an internal support structure;
FIG. 2 is a schematic diagram of a grouting tool according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a foundation pit support system in an embodiment of the present invention.
In the figure:
1-an internal support structure;
10-a steel pipe;
11-pouch;
12-anchor ear;
2-grouting tools;
20-grouting pipe;
200-a hole opening section;
21-a first hollow rubber body;
22-a second hollow rubber body;
23-a first inflation and deflation pipe;
24-a second inflation and deflation pipe.
Detailed Description
The inner support structure, the foundation pit support system and the construction method thereof provided by the invention are further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Please refer to fig. 1, which is a schematic diagram of an internal support structure according to the present invention. As shown in fig. 1, the inner support structure 1 includes: the steel pipe 10 and at least two bags 11 are sleeved and fixed on the outer side of the steel pipe 10, wherein holes are formed in the body wall of the preset section of the steel pipe 10, part of the preset section of the steel pipe 10 is covered by the bags 11, and cement slurry is poured into the gap between each bag 11 and the steel pipe 10. In particular, the bearing capacity of the steel tube 10 can be improved by grouting the gap between the bladder 11 and the steel tube 10, so that the prepared inner support structure 1 has stronger rigidity and bearing capacity, the whole preparation process is simple, and less material is consumed, such as the material required by grouting.
Further, the bags 11 are disposed at one end of the steel pipe 10 (the bags 11 are disposed at the bottom of the steel pipe 10 when a foundation pit enclosure system is constructed), in this embodiment, the number of the bags 11 is two, the distance between the two bags 11 ranges from 1950mm to 2050mm, and the length of each bag 11 ranges from 5950mm to 6050 mm.
Preferably, the tube cavity of part of the section of the steel tube is filled with gravels, and the tube cavity of the remaining section of the steel tube is filled with cement paste. Preferably, the crushed stone filled in the steel pipe is graded crushed stone. In this embodiment, the lumen of the section of the steel pipe, which is 1m to 1.5m long at the upper part, is filled with graded crushed stones, so as to seal the end part of the steel pipe, form the grouting steel pipe into a solid member, improve the section rigidity of the grouting steel pipe, and further improve the strength of the end part of the steel pipe. The holes on the steel pipes, the grouting in the steel pipes and the filling of the broken stones are all used for enhancing the integral strength of the building of the follow-up construction enclosure system. Specifically, during construction of the enclosure system, sections with holes in the steel pipes are located below the bottom plate, the surrounding soil body can be reinforced through grouting, the bottom plate above the bottom plate is poured, the steel pipes above the bottom plate are cut off, the end parts of the remaining steel pipes after cutting off are filled with broken stones, the strength of the end parts of the steel pipes is guaranteed, and meanwhile, a structural foundation is laid for the subsequent steel pipes and the ring beam to be poured into a whole.
In this embodiment, referring to fig. 1, the inner support structure 1 further includes a plurality of anchor ears 12, the anchor ears 12 fix the bag 11 on the steel pipe 10, actually, two adjacent anchor ears 12 are sleeved outside the bag 11 at equal intervals or non-equal intervals, the specific interval is determined to meet the requirement of a grouting tool and prevent slurry leakage, and the embodiment adopts equal intervals.
In another embodiment, please refer to fig. 3, which is a schematic structural diagram of a foundation pit enclosure system. As shown in fig. 3, the foundation pit support system provided by the invention mainly comprises a foundation pit and an inner support structure 1 arranged on the inner side of the foundation pit, wherein the inner support structure supports the foundation pit in an inclined support mode. Because the inclined strut is used as one of the common modes of the foundation pit inner support, the specific construction process and the arrangement position are not elaborated too much, and only elaboration relates to the content which needs to be noticed when the inner support structure provided by the invention is adopted for construction.
Specifically, the preset section of the steel pipe 10 in the inner support structure is located at the part below the bottom plate of the foundation pit, so that slurry flowing out of the hole of the preset section of the steel pipe 10 can be fused with soil around a lower hole of the bottom plate of the foundation pit, and the stability of the steel pipe is enhanced.
Furthermore, the bag in the inner support structure is arranged at the bottom of the steel pipe, and the bottom of the steel pipe is a critical foundation pit bottom plate, so that the supporting force at the bottom of the steel pipe can be effectively improved after the bag is grouted.
In order to better understand how the foundation pit enclosure system is constructed, the construction method of the foundation pit enclosure system is explained in detail below, and the construction method of the foundation pit enclosure system comprises the following steps:
s1: carrying out field leveling treatment;
s2: excavating a groove;
s3: pile position measuring and placing;
s4: the inner support structure is arranged on the inner side of the foundation pit in an inclined support mode;
specifically, step S4 includes the following steps:
s41: adopt and shake into machinery in with the soil of impressing of a processed steel pipe, specifically press to appointed elevation and angle, the steel pipe of processing is for having seted up the hole on predetermineeing the district section, and the outside cup joints the steel pipe that is fixed with the bag. Specifically, the mechanical arm is used for vibrating and sinking, and the dip angle of the mechanical arm is controlled to be 45-60 degrees in the sinking process, wherein the dip angle is the included angle between the steel pipe and the horizontal line.
S42: and placing a grouting tool on the inner side of the steel pipe to perform segmented grouting on the part of the steel pipe sleeved and fixed with the bag on the outer side until all gaps between the bag and the steel pipe are filled with cement paste.
Please refer to fig. 2, which is a schematic structural diagram of the grouting tool in this embodiment. As shown in fig. 2, the grouting tool 2 includes: the grouting device comprises a first hollow rubber body 21, a second hollow rubber body 22, a first air charging and discharging pipe 23 communicated with the first hollow rubber body 21, a second air charging and discharging pipe 24 communicated with the second hollow rubber body 22, an air pump connected with the first air charging and discharging pipe 23 and the second air charging and discharging pipe 24, and a grouting pipe 20 penetrating through the first hollow rubber body 21 and communicated with the second hollow rubber body 22, wherein the grouting pipe 20 comprises an open hole section 200, and the open hole section 200 is the grouting pipe 20 distributed between the first hollow rubber body 21 and the second hollow rubber body 22. Specifically, the first hollow rubber body 21 and the second hollow rubber body 22 are both cylindrical rubber bodies with two closed ends.
Based on the grouting tool 2 with the above structure, please refer to fig. 1 and 2, the specific execution process of step S42 is as follows:
s421: placing the opening section 200 of the grouting pipe 20 in the grouting tool 2 into the inner side of the steel pipe between any two adjacent anchor ears 12 on the bag (i.e. the distance between the two adjacent anchor ears 12 is slightly larger than the distance between the first hollow rubber body 21 and the second hollow rubber body 22);
s422: the first hollow rubber body 21 and the second hollow rubber body 22 are inflated by an air pump, so that the first hollow rubber body 21 and the second hollow rubber body 22 are attached to the outer side of the steel pipe wall after being expanded in volume, and the first hollow rubber body 21 and the second hollow rubber body 22 are respectively attached to the steel pipe wall to generate friction force, so that the first hollow rubber body 21 and the second hollow rubber body 22 are prevented from being displaced due to subsequent grouting pressure.
S423: grouting by using a grouting pipe 20, wherein the grouting slurry is diffused into a bag outside the steel pipe through a hole on the open hole section 200 of the grouting pipe 20 and a hole on the steel pipe, so as to complete grouting of a gap between the bag between two adjacent anchor ears 12 and the steel pipe;
the concrete process starts the grouting pump and carries out the slip casting, because first hollow rubber body 21 with the hollow rubber body 22 of second is both ends confined structure, consequently flows into slip casting pipe 20 back at thick liquid, can via under the effect of thick liquid hydraulic pressure first hollow rubber body 21 with the hole blowout of the trompil section 200 of slip casting pipe 20 between the hollow rubber body 22 of second, and then in the sack in the hole diffusion outside the steel pipe on the steel pipe, form the atress system of similar reaming stake. After the grouting is finished, a period of time is slightly equal, after the cement in the bag is solidified to a certain extent, the air in the hollow rubber cylinder is discharged, and the grouting tool 2 is moved to perform the next grouting operation.
S424: s421 to S423 are repeatedly executed until the gaps between the steel pipes and the bladder between all the two adjacent anchor ears 12 are grouted (the bladder area between the two adjacent anchor ears 12 is used as a grouting section).
S43: and after the cement slurry poured into the gap between the bag and the steel pipe is hardened to a preset strength, the grouting tool 2 is pulled out.
S44: filling the lumen of a partial section of steel pipe with graded crushed stone and grouting the lumen of the remaining section of said steel pipe with cement slurry.
S5: and processing the connecting node of the steel pipe and the ring beam in the inner support structure, and pouring the ring beam to form an enclosure system.
Specifically, a certain amount of steel bars and steel plates are welded on the outer steel wall of the anchoring ring beam part of the inner supporting structure, so that the anchoring strength of the pile head is ensured, and the node meets the design requirement.
In summary, in the inner support structure, the foundation pit support system and the construction method thereof provided by the invention, the inner support structure comprises a steel pipe and at least two bags sleeved and fixed on the outer side of the steel pipe, the wall of the preset section of the steel pipe is provided with a hole, the preset section of part of the steel pipe is covered by the bags, and the gap between the bags and the steel pipe is filled with cement slurry, so that the bearing capacity and the section rigidity of the steel pipe are effectively improved, and the requirement of a subsequent support system on the support rigidity is met. Therefore, when the internal support structure is used for construction of an enclosure system, the whole construction process is simple, the input materials are less, and compared with the traditional enclosure system which needs to adopt a filling pile, a waterproof curtain and a concrete horizontal support or a steel support, the construction cost is greatly reduced, and the construction period is shortened.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. An internal support structure, comprising: the steel pipe and at least two bags are fixedly sleeved on the outer side of the steel pipe, wherein holes are formed in the wall of a preset section of the steel pipe, part of the preset section of the steel pipe is covered by the bags, and cement slurry is poured into the gap between each bag and the steel pipe.
2. The internal support structure of claim 1, wherein the number of pockets is two, the spacing between the pockets ranges from 1950mm to 2050mm, and the length of the pockets ranges from 5950mm to 6050 mm.
3. The internal support structure of claim 1, wherein the lumens of the partial sections of the steel tubes are filled with crushed stone, and the lumens of the remaining sections of the steel tubes are filled with cement slurry.
4. The internal support structure of any one of claims 1 to 3, further comprising a plurality of anchor ears securing the bladder to the steel tube.
5. A foundation pit enclosure system, comprising: the foundation pit supporting structure comprises a foundation pit and an inner supporting structure arranged on the inner side of the foundation pit and used for supporting the foundation pit in a diagonal bracing mode, wherein the inner supporting structure comprises a steel plate and a steel plate.
6. The foundation pit enclosure system of claim 5 wherein the predetermined section of steel pipe in the inner support structure is located in a portion of the foundation pit below the floor of the foundation pit.
7. The foundation pit enclosure system of claim 6 wherein the bladder in the inner support structure is disposed at the bottom of a steel tube that is critical to the foundation pit floor.
8. A construction method of a foundation pit enclosure system is characterized by comprising the following steps:
carrying out field leveling treatment;
excavating a groove;
pile position measuring and placing;
arranging the inner support structure according to any one of claims 1 to 4 on the inner side of a foundation pit in a diagonal bracing manner;
and processing the connecting node of the steel pipe and the ring beam in the inner support structure, and pouring the ring beam to form an enclosure system.
9. The method for constructing a foundation pit enclosure system of claim 8, wherein the step of providing the inner support structure inside the foundation pit in a diagonal bracing manner comprises the steps of:
pressing a processed steel pipe into soil by adopting a vibration machine, wherein the processed steel pipe is a steel pipe which is provided with a hole on a preset section and is fixedly sleeved with a bag on the outer side;
placing a grouting tool on the inner side of the steel pipe to perform segmented grouting on the part of the steel pipe sleeved and fixed with the bag on the outer side until cement slurry is poured into gaps between all bags and the steel pipe;
after the cement slurry poured into the gap between the bag and the steel pipe is hardened to a preset strength, removing the grouting tool;
filling the lumen of a partial section of steel pipe with graded crushed stone and grouting the lumen of the remaining section of said steel pipe with cement slurry.
10. The method of constructing a foundation pit enclosure system of claim 9, wherein the grouting tool comprises: the grouting device comprises a first hollow rubber body, a second hollow rubber body, a first inflation and deflation pipe communicated with the first hollow rubber body, a second inflation and deflation pipe communicated with the second hollow rubber body, an air pump connected with the first inflation and deflation pipe and a grouting pipe penetrating through the first hollow rubber body and communicated with the second hollow rubber body, wherein the grouting pipe comprises an open hole section, and the open hole section is a grouting pipe distributed between the first hollow rubber body and the second hollow rubber body;
the grouting tool is placed on the inner side of the steel pipe, and the process of performing segmented grouting on the steel pipe sleeved and fixed with the bag on the outer side comprises the following steps:
s421: placing the opening section of the grouting pipe in the grouting tool into the inner side of the steel pipe between any two adjacent hoops on the bag;
s422: inflating the first hollow rubber body and the second hollow rubber body by using an air pump so as to enable the first hollow rubber body and the second hollow rubber body to be attached to the outer side steel pipe walls after the volumes of the first hollow rubber body and the second hollow rubber body are expanded;
s423: grouting by using a grouting pipe, wherein the grouting slurry is diffused into the bag outside the steel pipe through the holes on the opening section of the grouting pipe and the holes on the steel pipe so as to complete grouting of the gap between the bag between two adjacent anchor ears and the steel pipe;
s424: and repeating S421 to S423 until the gaps between the steel pipes and the sacks between every two adjacent hoops are grouted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035288.5A CN110700278A (en) | 2019-10-29 | 2019-10-29 | Inner support structure, foundation pit support system and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035288.5A CN110700278A (en) | 2019-10-29 | 2019-10-29 | Inner support structure, foundation pit support system and construction method thereof |
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| Publication Number | Publication Date |
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| CN110700278A true CN110700278A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911035288.5A Pending CN110700278A (en) | 2019-10-29 | 2019-10-29 | Inner support structure, foundation pit support system and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112127373A (en) * | 2020-10-16 | 2020-12-25 | 中建四局第六建设有限公司 | Deep foundation pit pile-support integrated supporting system structure and segmented accurate grouting construction technology |
| CN113279410A (en) * | 2021-05-27 | 2021-08-20 | 中煤长江基础建设有限公司 | Bag slip casting formula foundation ditch bearing structure |
-
2019
- 2019-10-29 CN CN201911035288.5A patent/CN110700278A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112127373A (en) * | 2020-10-16 | 2020-12-25 | 中建四局第六建设有限公司 | Deep foundation pit pile-support integrated supporting system structure and segmented accurate grouting construction technology |
| CN113279410A (en) * | 2021-05-27 | 2021-08-20 | 中煤长江基础建设有限公司 | Bag slip casting formula foundation ditch bearing structure |
| CN113279410B (en) * | 2021-05-27 | 2022-06-10 | 中煤长江基础建设有限公司 | Bag slip casting formula foundation ditch bearing structure |
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