CN111764405A - Combined foundation pit supporting beam string - Google Patents
Combined foundation pit supporting beam string Download PDFInfo
- Publication number
- CN111764405A CN111764405A CN202010776763.0A CN202010776763A CN111764405A CN 111764405 A CN111764405 A CN 111764405A CN 202010776763 A CN202010776763 A CN 202010776763A CN 111764405 A CN111764405 A CN 111764405A
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- Prior art keywords
- string
- foundation pit
- prestress
- supporting
- concrete beam
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract 2
- 238000009412 basement excavation Methods 0.000 description 8
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention relates to a combined foundation pit supporting beam string, comprising: the inner side of the concrete beam is not provided with a steel purlin, and a pull rod at the end part of a string beam is embedded and fixed in the concrete beam; the supporting prestress device directly or indirectly acts on the concrete beam at the position corresponding to the end pull rod; the supporting prestress device is not rigidly connected with the end pull rod; the tensile device comprises a pre-buried metal piece in a concrete beam in a foundation pit, the prestress adjusting device is connected with a prestress connecting piece, and the prestress connecting piece is connected with a position, extending out of the concrete beam, of the metal piece. The truss support system and the beam string support system are independent from each other, so that the truss support system and the beam string support system can be independently installed and constructed in the construction process and can also be independently operated in the dismantling process, the construction period is shortened, and the construction flexibility is improved.
Description
Technical Field
The invention relates to a foundation pit supporting system, in particular to a combined foundation pit supporting beam string, and belongs to the technical field of building construction.
Background
In order to ensure the safety of the construction of the underground structure and the surrounding environment of the foundation pit, the supporting, reinforcing and protecting measures are adopted for the side wall of the foundation pit and the surrounding environment. In deep foundation pit engineering of high-rise buildings and subways, because excavation is carried out in cities, various structures such as traffic main roads, built buildings or pipelines and the like usually exist around foundation pits, which relates to an important content of excavation of the foundation pits and protects safe use of the surrounding structures.
In the prior art, independence (through steel enclosing purlin interconnect) is lacked between truss braced system and the beam string braced system, leads to unable installation construction alone in the work progress, demolishs and also needs the collaborative operation, influences construction period, reduces the construction flexibility. For example, chinese patent publication No. CN104532850A, published as 2015, 4/22, discloses a foundation pit supporting system, which uses the above-mentioned directly-supported prestressing device, the directly-supported prestressing adjustment mechanism thereof abuts against two opposite steel enclosing purlins, an obliquely-arranged diagonal rod is arranged between the main supporting beam and the steel enclosing purlin, and two ends of the diagonal rod are respectively hinged to the main supporting beam and the steel enclosing purlin.
In addition, in the prior art, the foundation pit steel support system can only be compressed and can not be in tension. For a deep foundation pit, sludge exists in soil outside the pit, or excavation on two sides of an external corner support of the foundation pit is unbalanced, and under the condition of multiple supports, the enclosure structure is likely to expand outwards under different working conditions such as excavation and support replacement, so that the enclosure structure is separated from the support, the calculated stress assumption is inconsistent, uncertainty of excavation of the foundation pit is difficult to deal with, and the safety problem of the foundation pit is likely to occur.
Disclosure of Invention
The invention aims to provide a combined foundation pit supporting beam string, which enables a truss supporting system and a beam string supporting system to be independent from each other, so that the truss supporting system and the beam string supporting system can be independently installed and constructed in the construction process and can also be independently operated during dismantling, the construction period is shortened, and the construction flexibility is improved; meanwhile, a steel enclosing purlin is not needed, the pull rod in the beam string is connected with the concrete beam in a pulling and pressing mode through the support rod to form a novel combined beam string system, the whole set of steel supporting system has bidirectional rigidity towards the inside and the outside of the pit in foundation pit supporting, and the steel enclosing purlin is stronger in integrity and higher in safety.
The invention adopts the following technical scheme:
a combined foundation pit supporting beam string, comprising: the inner side of the concrete beam 2 is not provided with a steel purlin, and a tension rod 1 at the end part of a string beam is embedded and fixed in the concrete beam 2; the supporting prestress device directly or indirectly acts on the concrete beam 2 corresponding to the end pull rod 1; the supporting prestress device is not rigidly connected with the end pull rod 1; tensile device 8, tensile device 5 includes pre-buried metalwork in the concrete beam 2 in the foundation ditch, and prestressing force adjusting device 3 is connected with prestressing force connecting piece 4, prestressing force connecting piece 4 with the metalwork stretches out the position of concrete beam 2 is connected.
Preferably, said supporting prestressing means also comprise said tensile means 8.
Further, the supporting prestressing device vertically acts on the concrete beam 2.
Preferably, the end tie rods 1 are obliquely embedded and fixed in the concrete beam 2.
Furthermore, the supporting prestress device comprises supporting rods which are connected in sequence.
Further, the prestress adjusting means 3 of the supporting prestress means acts on the secondary grouting area 5 on the concrete girder 2.
Furthermore, the supporting rod is a section steel supporting rod.
The invention has the beneficial effects that: the truss support system and the beam string support system are independent from each other, so that the truss support system and the beam string support system can be independently installed and constructed in the construction process and can also be independently operated during dismantling, the construction period is shortened, and the construction flexibility is improved; need not steel purlin, will open the pull rod in the string roof beam and carry out the tension-compression with the concrete beam through the vaulting pole and be connected and form neotype combination string roof beam system for a whole set of steel braced system has to hole inside and to hole outside two-way rigidity in foundation ditch support, and the wholeness is stronger, the security is higher.
Drawings
Fig. 1 is a schematic view of an excavation support system including a combination excavation support beam string according to the present invention, not shown to illustrate the structure outside the excavation.
Fig. 2 is an enlarged view of a structural portion of the beam string of fig. 1.
Fig. 3 is a partially enlarged view of fig. 2.
Fig. 4 is an enlarged view of the node structure of the beam string and the truss in fig. 1, which is located at the corresponding position of the diagonal bracing prestressing device.
In the figure, 1, an end pull rod, 2, a concrete beam, 3, a prestress adjusting device, 4, a prestress connecting piece, 5, a secondary grouting area, 6, a concrete bracket, 7, a middle pull rod and 8, a tensile device.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 to 3, a combined supporting beam for foundation pit string includes: the inner side of the concrete beam 2 is not provided with a steel purlin, and a tension rod 1 at the end part of a string beam is embedded and fixed in the concrete beam 2; the supporting prestress device directly or indirectly acts on the concrete beam 2 corresponding to the end pull rod 1; the supporting prestress device is not rigidly connected with the end pull rod 1; tensile device 8, tensile device 5 includes pre-buried metalwork in the concrete beam 2 in the foundation ditch, and prestressing force adjusting device 3 is connected with prestressing force connecting piece 4, prestressing force connecting piece 4 with the metalwork stretches out the position of concrete beam 2 is connected. The truss support system and the beam string support system are independent from each other due to the structural design, so that the truss support system and the beam string support system can be independently installed and constructed in the construction process and can also be independently operated during dismantling, the construction period is shortened, and the construction flexibility is improved; meanwhile, a steel enclosing purlin is not needed, the pull rod in the beam string is connected with the concrete beam in a pulling and pressing mode through the support rod to form a novel combined beam string system, the whole set of steel supporting system has bidirectional rigidity towards the inside and the outside of the pit in foundation pit supporting, and the steel enclosing purlin is stronger in integrity and higher in safety.
Wherein the truss support system is a straight truss system acting vertically on the concrete beam 2, see figure 4.
As a preferable scheme of this embodiment, the end tie rods 1 are obliquely embedded and fixed in the concrete beam 2, as shown in fig. 4, with this design, a steel purlin can be omitted, so that the beam string is stressed clearly, the integrity of the system is stronger, and the safety is higher.
Referring to fig. 4, the supporting prestress device comprises a supporting rod, a prestress connecting piece 4 and a prestress adjusting device 3 which are connected in sequence.
With continued reference to fig. 4, the support rods are profile steel support rods.
While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a combined foundation ditch supports beam string roof beam which characterized in that includes:
the inner side of the concrete beam (2) is not provided with a steel purlin, and a tension rod (1) at the end part of a string beam is embedded and fixed in the concrete beam (2);
the supporting prestress device directly or indirectly acts on the concrete beam (2) corresponding to the end pull rod (1); the supporting prestress device is not rigidly connected with the end pull rod (1);
tensile device (8), pre-buried metalwork in concrete beam (2) in tensile device (5) including the foundation ditch, prestressing force adjusting device (3) are connected with prestressing force connecting piece (4), prestressing force connecting piece (4) with the metalwork stretches out the position of concrete beam (2) is connected.
2. The combination type foundation pit bracing beam string beam of claim 1, wherein: the supporting prestressing means also comprise the tensile means (8).
3. The combined foundation pit bracing beam according to claim 2, wherein: the supporting prestress device vertically acts on the concrete beam (2).
4. The combination type foundation pit bracing beam string beam of claim 1, wherein: the end pull rod (1) is obliquely embedded and fixed in the concrete beam (2).
5. The combination type foundation pit bracing beam string according to claim 3, characterized in that: the support prestress device comprises support rods which are connected in sequence.
6. The combination type foundation pit bracing beam string according to claim 3, characterized in that: the prestress adjusting device (3) of the support prestress device acts on the secondary grouting area (5) on the concrete beam (2).
7. The combination type foundation pit bracing beam string beam of claim 5, wherein: the support rod is a section steel support rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010776763.0A CN111764405A (en) | 2020-08-05 | 2020-08-05 | Combined foundation pit supporting beam string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010776763.0A CN111764405A (en) | 2020-08-05 | 2020-08-05 | Combined foundation pit supporting beam string |
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| Publication Number | Publication Date |
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| CN111764405A true CN111764405A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010776763.0A Pending CN111764405A (en) | 2020-08-05 | 2020-08-05 | Combined foundation pit supporting beam string |
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| CN (1) | CN111764405A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195936A (en) * | 2020-11-06 | 2021-01-08 | 上海巨鲲科技有限公司 | Device and method for applying prestress to beam string |
| CN112227386A (en) * | 2020-11-06 | 2021-01-15 | 上海巨鲲科技有限公司 | Pre-buried steel pull rod structure of open string beam of foundation pit |
| CN113529740A (en) * | 2021-07-29 | 2021-10-22 | 江西建工第一建筑有限责任公司 | Beam string supporting system |
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|---|---|---|---|---|
| KR100742221B1 (en) * | 2006-08-21 | 2007-07-24 | (주)리튼브릿지 | Temporary system for land-side protection wall |
| CN103967019A (en) * | 2014-05-28 | 2014-08-06 | 德清鑫德机械有限公司 | Fish-bellied beam device for supporting foundation ditch |
| CN204475665U (en) * | 2014-12-17 | 2015-07-15 | 厦门科思泰建筑科技有限公司 | The modified node method of beam string |
| CN106284367A (en) * | 2015-05-29 | 2017-01-04 | 上海城地建设股份有限公司 | A kind of foundation pit supporting construction using scalable prestress steel to support |
| CN208965560U (en) * | 2018-09-04 | 2019-06-11 | 戴向胜 | Intelligent foundation pit support with longspan structure |
| CN110219306A (en) * | 2019-07-08 | 2019-09-10 | 上海巨鲲科技有限公司 | Concrete and the combined foundation pit support system of metal structure |
| CN110469102A (en) * | 2019-09-10 | 2019-11-19 | 江苏南通二建集团有限公司 | A kind of high-altitude combined steel beam installs the operating platform and its construction method |
| CN212375879U (en) * | 2020-08-05 | 2021-01-19 | 上海巨鲲科技有限公司 | Combined foundation pit supporting beam string |
-
2020
- 2020-08-05 CN CN202010776763.0A patent/CN111764405A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742221B1 (en) * | 2006-08-21 | 2007-07-24 | (주)리튼브릿지 | Temporary system for land-side protection wall |
| CN103967019A (en) * | 2014-05-28 | 2014-08-06 | 德清鑫德机械有限公司 | Fish-bellied beam device for supporting foundation ditch |
| CN204475665U (en) * | 2014-12-17 | 2015-07-15 | 厦门科思泰建筑科技有限公司 | The modified node method of beam string |
| CN106284367A (en) * | 2015-05-29 | 2017-01-04 | 上海城地建设股份有限公司 | A kind of foundation pit supporting construction using scalable prestress steel to support |
| CN208965560U (en) * | 2018-09-04 | 2019-06-11 | 戴向胜 | Intelligent foundation pit support with longspan structure |
| CN110219306A (en) * | 2019-07-08 | 2019-09-10 | 上海巨鲲科技有限公司 | Concrete and the combined foundation pit support system of metal structure |
| CN110469102A (en) * | 2019-09-10 | 2019-11-19 | 江苏南通二建集团有限公司 | A kind of high-altitude combined steel beam installs the operating platform and its construction method |
| CN212375879U (en) * | 2020-08-05 | 2021-01-19 | 上海巨鲲科技有限公司 | Combined foundation pit supporting beam string |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195936A (en) * | 2020-11-06 | 2021-01-08 | 上海巨鲲科技有限公司 | Device and method for applying prestress to beam string |
| CN112227386A (en) * | 2020-11-06 | 2021-01-15 | 上海巨鲲科技有限公司 | Pre-buried steel pull rod structure of open string beam of foundation pit |
| CN113529740A (en) * | 2021-07-29 | 2021-10-22 | 江西建工第一建筑有限责任公司 | Beam string supporting system |
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