CN110258581B - Foundation pit supporting beam structure and construction method - Google Patents
Foundation pit supporting beam structure and construction method Download PDFInfo
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- CN110258581B CN110258581B CN201910532229.2A CN201910532229A CN110258581B CN 110258581 B CN110258581 B CN 110258581B CN 201910532229 A CN201910532229 A CN 201910532229A CN 110258581 B CN110258581 B CN 110258581B
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- 238000010276 construction Methods 0.000 title claims abstract description 51
- 238000011065 in-situ storage Methods 0.000 claims abstract description 47
- 238000009417 prefabrication Methods 0.000 claims abstract description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000004567 concrete Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to the technical field of foundation pit construction, and discloses a foundation pit supporting beam structure and a construction method, wherein the foundation pit supporting beam structure comprises the following components: a prefabricated section and a cast-in-situ section; the cast-in-situ section comprises a joint part where any at least two beams of the supporting beam, the crown beam and the waist beam are connected; the prefabricated section is positioned at the non-node part, and reinforcing steel bars are reserved at two ends of the prefabricated section respectively and are connected with the cast-in-situ section. According to the foundation pit supporting beam structure and the construction method, a supporting beam system is formed by combining the prefabricated non-node supporting beam and the cast-in-situ node supporting beam, the prefabricated section can be constructed in parallel with earth work, the construction period can be saved, the quality and the external dimension of the supporting beam can be controlled more strictly through prefabrication, and the construction quality and the construction efficiency can be improved; in addition, the prefabricated section can be connected with the cast-in-situ section through hoisting, and the construction speed is high.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a foundation pit supporting beam structure and a construction method.
Background
In the construction of deep foundation pit engineering, the problems of subsidence deformation of a ground structure, lateral movement of a supporting structure and the like can occur frequently. In order to improve the stability of the deep foundation pit, some foundation pit supporting measures are usually adopted, and at present, the supporting forms which are commonly adopted are concrete guard piles, reinforced concrete inner supporting beams and guard piles, guard piles and transverse reinforcement body combinations and the like.
At present, the traditional construction method of the deep foundation pit supporting structure comprises the steps of firstly excavating earthwork to a designed elevation, providing a supporting beam with enough working surface, binding reinforcing steel bars in a plurality of ways, paving templates, and pouring concrete.
The existing construction achieves better construction effect under proper working conditions, but has the defects in the aspects of improving the site construction efficiency, saving the material consumption of the supporting structure, protecting the ecological environment and the like. The whole construction flow has great dependence on earthwork operation, and has great difficulty in controlling the construction period of the support beam due to the influence of multiple factors such as climate, environmental protection and the like. And the cast-in-situ supporting beam is easy to adhere to other objects such as concrete of the bottom cushion layer after digging under the earthwork, thereby affecting the safety.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to provide a foundation pit supporting beam structure and a construction method, which are used for solving or partially solving the problems that the existing construction has great dependence on earthwork operation, and the construction period of the supporting beam construction is difficult to control due to the influence of multiple factors such as climate, environmental protection and the like.
(II) technical scheme
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a foundation pit support beam structure, including: a prefabricated section and a cast-in-situ section; the cast-in-situ section comprises a node part where any at least two beams of the supporting beam, the crown beam and the waist beam are intersected; the prefabricated section is positioned at a non-node position, and reinforcing steel bars are reserved at two ends of the prefabricated section respectively and are connected with the cast-in-situ section.
On the basis of the scheme, protruding tenons are respectively arranged at two ends of the prefabricated section, and the protruding tenons are inserted into the cast-in-situ section.
On the basis of the scheme, an asphalt felt layer is paved on the cushion layer at the bottom of the node part.
Based on the scheme, the cast-in-situ section also comprises non-node parts with the length less than 2.5m or the number of the same length less than 10 and armpit parts of the node parts.
On the basis of the scheme, the radius covered by the node part is 1-1.4m when the node part is not more than the limb girder; the radius covered by the node part exceeding the limb beam is 1.6-2m; the lengths of the prefabricated sections are all more than or equal to 2.5m, and the number of the same length is more than or equal to 10.
On the basis of the scheme, the protruding tenon is positioned at the middle part of the end part of the prefabricated section, the area ratio of the protruding tenon on the end surface of the prefabricated section is more than 1/2, and the depth of the protruding tenon inserted into the cast-in-situ section is more than or equal to 500mm.
According to a second aspect of the present invention, there is provided a construction method of the foundation pit support beam structure according to any one of the above aspects, comprising: prefabricating parts with the length larger than a preset length and the number of the same length larger than a preset number in non-node parts of the support beam; and (3) carrying out cast-in-situ on other parts in the supporting beam, and connecting with the prefabricated parts in the casting process.
On the basis of the above scheme, before prefabricating the parts of the non-node parts of the support beam, the parts of which the lengths are greater than the preset lengths and the number of the same lengths is greater than the preset number, the prefabricating method further comprises: and counting the length of the beams at the non-node parts and the number of the beams with the same length according to the preset supporting beam structure and size, and determining the length of the beams to be prefabricated and the number of the beams with the same length.
On the basis of the scheme, prefabrication and foundation pit earthwork excavation are performed in parallel on the parts, of the non-node parts of the support beam, of which the length is greater than the preset length and the number of the same length is greater than the preset number.
On the basis of the scheme, the method further comprises the following steps before the other parts in the supporting beam are cast in situ: and paving an asphalt felt layer on the cushion layer at the node position.
(III) beneficial effects
The invention provides a foundation pit supporting beam structure and a construction method, which are characterized in that a supporting beam is divided into two parts, wherein one part is a prefabricated section, namely, the supporting beam is prefabricated; the other part is a cast-in-place section, namely, the cast-in-place section is finished through cast-in-place. The support beam structure adopts a mode of combining a prefabricated non-node support beam and a cast-in-situ node support beam to form a support beam system, and the prefabricated section can be constructed in parallel with earth work, so that the construction period can be saved, the quality and the external dimension of the support beam can be controlled more strictly through prefabrication, and the construction quality and the construction efficiency can be improved; in addition, the prefabricated section can be connected with the cast-in-situ section through hoisting, and the construction speed is high.
Drawings
FIG. 1 is a schematic top view of a foundation pit support system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a prefabricated section according to an embodiment of the present invention;
FIG. 3 is a schematic longitudinal cross-sectional view of a preform segment in an embodiment of the invention;
FIG. 4 is a schematic transverse cross-sectional view of a preform segment in an embodiment of the invention;
FIG. 5 is a schematic view of a limb beam at a joint portion in an embodiment of the present invention;
FIG. 6 is a schematic view of a multi-limb beam at a node portion in an embodiment of the invention;
fig. 7 is a construction flow chart of a foundation pit supporting beam in an embodiment of the invention.
Reference numerals illustrate:
wherein, 1: longitudinal steel bars; 2: protruding tenons; 3: stirrups; 4: and a node part.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the invention provides a foundation pit supporting beam structure, which comprises the following components: prefabricated section and cast-in-place section. The cast-in-situ section comprises a node part 4 where any at least two beams of the supporting beam, the crown beam and the waist beam are intersected. The prefabricated section is positioned at the non-node part, and reinforcing steel bars are reserved at two ends of the prefabricated section respectively and are connected with the cast-in-situ section.
Fig. 1 is a schematic top view of a foundation pit supporting structure. As shown in fig. 1, the supporting structure in the foundation pit is annular in the foundation pit, so as to uniformly and firmly support the foundation pit. In supporting structures for foundation pits, especially deep foundation pits, supporting piles, crown beams, wales and supporting beams are generally included. The ring of beam bodies which are positioned on the outermost ring of the supporting structure and are connected with the top of the supporting pile which is in contact with the inner side wall of the foundation pit are crown beams; the waist is connected with a circle of beam body which is a waist beam. The supporting beams are other beams except the crown beam and the waist beam in the supporting structure. The node part 4 is the intersection part of any beam in all beams of the support system, and can be the intersection part of two beams or the intersection part of more than two beams; the cross part of the two supporting beams can be the cross part of the supporting beams and the crown beam or the waist beam.
The support system is provided with a plurality of support beams, the support beam at the node part 4 is a cast-in-situ section, and the prefabricated section is a section of beam body positioned at the non-node part, namely, the section of beam body connected between two nodes. There are multiple cast-in-place segments and multiple prefabricated segments in the support system. The prefabricated section may be prefabricated prior to construction of the support system. When the support system is constructed, the cast-in-situ section is connected with the prefabricated section through the longitudinal steel bars 1 reserved at the end parts of the prefabricated section, and then pouring is carried out, so that the cast-in-situ section and the prefabricated section are connected into a whole.
According to the foundation pit supporting beam structure provided by the embodiment, the supporting beam is divided into two parts, wherein one part is a prefabricated section, namely, the prefabricated section is prefabricated; the other part is a cast-in-place section, namely, the cast-in-place section is finished through cast-in-place. The support beam structure adopts a mode of combining a prefabricated non-node support beam and a cast-in-situ node support beam to form a support beam system, and the prefabricated section can be constructed in parallel with earth work, so that the construction period can be saved, the quality and the external dimension of the support beam can be controlled more strictly through prefabrication, and the construction quality and the construction efficiency can be improved; in addition, the prefabricated section can be connected with the cast-in-situ section through hoisting, and the construction speed is high.
Further, with reference to fig. 2, on the basis of the above embodiment, two ends of the prefabricated section are respectively provided with a protruding tenon 2, and the protruding tenon 2 is inserted into the cast-in-place section. The arrangement of the protruding rabbet 2 can increase the biting force between the prefabricated section and the cast-in-situ section, so that the connection of the prefabricated section and the cast-in-situ section is firmer and more stable, and the firmness of the whole structure is improved. The protruding tenon 2 is a bump structure arranged on the end face of the prefabricated section, and can be tenon-shaped, rectangular-shaped or other.
Further, referring to fig. 3 and 4, the prefabricated section includes a longitudinal bar 1, and a plurality of stirrups 3 are provided at intervals along the length direction of the longitudinal bar 1. The stirrup 3 fixes the longitudinal bar 1. And casting in the range surrounded by the longitudinal steel bars 1 and the stirrups 3 to form a prefabricated section.
On the basis of the embodiment, an asphalt felt layer is further paved on the cushion layer at the bottom of the node part 4. In the existing construction, after the pouring of the node part 4 is completed and the excavation is completed under the earthwork, sundries such as concrete blocks are easy to adhere to the bottom of the node part 4, and the sundries have the risk of falling at any time, so that the artificial safety of construction is greatly influenced.
An asphalt felt layer may be laid on top of the bottom mat layer before pouring the node locations 4. The asphalt felt layer can effectively isolate the cast-in-situ beam from the cushion layer, can prevent sundries in the adhesive cushion layer from adhering in the casting process of the cast-in-situ beam, ensures safety, and improves the impression experience.
Further, based on the above embodiment, the cast-in-situ section further includes a non-node portion having a length of less than 2.5m or the same length and a number of less than 10, and an armpit portion of the node portion 4. The lengths of the prefabricated sections are all more than or equal to 2.5m, and the number of the same length is more than or equal to 10. In order to further improve the construction efficiency, the support beams at the non-node parts are distinguished. Because the prefabricated sections are typically prefabricated in a batch at the factory, for shorter or fewer beam bodies, the efficiency is not improved or even reduced compared to in-situ casting, while the cost is increased. Thus, for shorter or fewer beams, it is more suitable to use in-situ casting.
In the embodiment, the length of 2.5m and the number of 10 are taken as dividing nodes, and the supporting beams at non-node parts are distinguished. The concrete dividing nodes comprehensively consider the conditions of the supporting beams in the foundation pit supporting system, the conditions suitable for in-situ pouring and the conditions suitable for factory prefabrication, so that the concrete dividing nodes are suitable for the supporting beam structure, and the construction efficiency can be improved.
Further, the present embodiment describes the range of the cast-in-place at the node portion 4 based on the above embodiment. The concrete range should be different when pouring according to the different complexity of the node parts 4. Fig. 5 is a schematic view of the case where the node portion 4 is a limb beam, and the branch at the node portion 4 in fig. 5 is a beam body. The radius covered by the node part 4 is 1-1.4m when the node part is not more than the limb girder; namely, the cast-in-situ range at the node part 4 is a circular range with the radius of 1-1.4m, and the circular range takes the center point of the node part 4 as the center of the circle and is outwards diffused. Fig. 6 is a schematic view of the multi-limb beam at the node 4, and the branch at the node 4 in fig. 6 is a beam body. The radius covered by the node part 4 exceeding the limb girder is 1.6-2m. Namely, the cast-in-situ range at the node part 4 is a circular range with the radius of 1.6-2m, and the circular range takes the center point of the node part 4 as the center of the circle and is outwards diffused. The node part 4 is a limb beam, namely, the node part 4 is provided with four branches from the center to the periphery.
On the basis of the embodiment, further, the protruding tenon 2 is positioned at the middle part of the end part of the prefabricated section, and the area ratio of the protruding tenon 2 on the end surface of the prefabricated section is more than 1/2; the depth of the protruding tenon 2 inserted into the cast-in-situ section is more than or equal to 500mm. The end part of the prefabricated section can be guaranteed to be firmly engaged with the cast-in-situ section, and the connection firmness is improved.
For example, for a beam of 800X 800mm (cross-sectional dimension), the projecting tenon 2 is of dimensions 500X 500mm (length X height X depth) centrally located, wherein the depth is the depth of insertion into the cast-in-situ section; 400X 800mm beam, the protruding tenon 2 is 200X 500mm centrally arranged; a 1200 x 900mm beam with a raised tenon 2 of 800 x 500mm centrally located; the 600X 900mm beam, the protruding tenon 2 is 400X 500mm centrally located.
On the basis of the foregoing embodiment, further, this embodiment provides a construction method of the foundation pit support beam structure according to any one of the foregoing embodiments, including: prefabricating parts with the length larger than a preset length and the number of the same length larger than a preset number in non-node parts of the support beam; and (3) carrying out cast-in-situ on other parts in the supporting beam, and connecting with the prefabricated parts in the casting process.
On the basis of the foregoing embodiment, further, before prefabricating the portions of the non-node portion of the support beam, the portions having a length greater than a preset length and the same length having a number greater than a preset number, the method further includes: and counting the length of the beams at the non-node parts and the number of the beams with the same length according to the preset supporting beam structure and size, and determining the length of the beams to be prefabricated and the number of the beams with the same length.
On the basis of the above embodiment, further, prefabricating the non-node parts of the support beam, which have lengths greater than a preset length and the same length are greater than the preset number, in parallel with the earth excavation of the foundation pit. Further, the method also comprises the following steps before casting other parts in the supporting beam in situ: an asphalt felt layer is paved on the cushion layer of the node part 4.
Further, referring to fig. 7, a foundation pit supporting beam structure and a construction method are specifically as follows: firstly, numbering each supporting beam in a preset supporting system, subtracting the lengths of the positions of the nodes such as the primary beams and the secondary beams in the supporting beams, and prefabricating the supporting beams with multiple length modules. The armpit connected with the crown beam, the armpit of the main and secondary beam nodes and the modulus Liang Genshu with a certain length are all in the form of site binding. The end face size in the support beam is larger than the preset size and is a main beam, and the end face size is smaller than the preset size and is a secondary beam.
And prefabricating the supporting beam in parallel during earth excavation, and hoisting the supporting beam after the earth excavation reaches a designed elevation. The joint positions of the primary beam and the secondary beam are complicated due to the fact that the steel bars are crossed, and a cast-in-place construction mode is adopted. Considering that the engagement force of the joint of the cast-in-situ beam and the precast beam needs to meet the design requirement, arranging the two end heads of the precast beam into a form of protruding tenons 2, and increasing the engagement force with the cast-in-situ beam.
The foundation pit supporting beam structure and the construction method provided by the embodiment adopt a prefabricated non-node supporting beam and a cast-in-situ node supporting beam, and a supporting beam system is formed by combining the prefabricated non-node supporting beam and the cast-in-situ node supporting beam. The construction method of the precast reinforced concrete beam is adopted, so that the construction period is greatly saved, the operation is simple and convenient, the quality impression is good, and the construction is safe.
The foundation pit supporting beam structure and the construction method can be used for parallel construction with earthwork, construction period is saved, quality and appearance control of the second prefabricated ring supporting beam are more strict, hoisting construction speed is high, and adhesion of other objects such as concrete blocks and the like at the bottom after the earthwork is excavated is avoided, so that safety is guaranteed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A foundation pit support beam structure, comprising: a prefabricated section and a cast-in-situ section; the cast-in-situ section comprises a node part where any at least two beams of the support beam, the crown beam and the waist beam are intersected, and also comprises non-node parts with the length of less than 2.5m or the number of the same length of less than 10 and haunching parts of the node parts; the prefabricated section is positioned at a non-node part, reinforcing steel bars are reserved at two ends of the prefabricated section respectively and are connected with the cast-in-situ section, protruding tenons are arranged at two ends of the prefabricated section respectively, and the protruding tenons are inserted into the cast-in-situ section; the radius of the node part which is not more than the coverage area of the limb girder is 1-1.4m; the radius covered by the node part exceeding the limb beam is 1.6-2m; the lengths of the prefabricated sections are all more than or equal to 2.5m, and the number of the same length is more than or equal to 10.
2. The foundation pit support beam structure of claim 1, wherein an asphalt felt layer is laid on the pad layer at the bottom of the node portion.
3. The foundation pit supporting beam structure according to claim 1, wherein the protruding tenon is located at the middle part of the end part of the prefabricated section, the area ratio of the protruding tenon on the end face of the prefabricated section is greater than 1/2, and the depth of the protruding tenon inserted into the cast-in-place section is greater than or equal to 500mm.
4. A method of constructing a foundation pit support beam structure as claimed in any one of claims 1 to 3, comprising:
prefabricating parts with the length larger than a preset length and the number of the same length larger than a preset number in non-node parts of the support beam;
and (3) carrying out cast-in-situ on other parts in the supporting beam, and connecting with the prefabricated parts in the casting process.
5. The construction method according to claim 4, wherein before prefabricating the portion having the length greater than the preset length and the number of the same length greater than the preset number among the non-node portions of the support beam, further comprising:
and counting the length of the beams at the non-node parts and the number of the beams with the same length according to the preset supporting beam structure and size, and determining the length of the beams to be prefabricated and the number of the beams with the same length.
6. The construction method according to claim 4, wherein prefabrication of the non-node parts of the support beam, which are longer than a predetermined length and have the same length in a number greater than the predetermined number, is performed in parallel with excavation of earth in the foundation pit.
7. The method according to claim 4, further comprising, before the casting of the other part of the support beam:
and paving an asphalt felt layer on the cushion layer at the node position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910532229.2A CN110258581B (en) | 2019-06-19 | 2019-06-19 | Foundation pit supporting beam structure and construction method |
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| CN201910532229.2A CN110258581B (en) | 2019-06-19 | 2019-06-19 | Foundation pit supporting beam structure and construction method |
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| CN110258581A CN110258581A (en) | 2019-09-20 |
| CN110258581B true CN110258581B (en) | 2024-03-15 |
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| CN110258581A (en) | 2019-09-20 |
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