CN218090882U - Underground structure without replacing support in construction period - Google Patents
Underground structure without replacing support in construction period Download PDFInfo
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- CN218090882U CN218090882U CN202220797068.7U CN202220797068U CN218090882U CN 218090882 U CN218090882 U CN 218090882U CN 202220797068 U CN202220797068 U CN 202220797068U CN 218090882 U CN218090882 U CN 218090882U
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Abstract
The utility model relates to an underground structure that need not to trade and prop during construction. The utility model aims at: the technical problem that support replacement cannot be completed under the condition of support removal when the excavation depth of a foundation pit is large and force transmission structures such as a middle plate and a middle beam do not exist on the whole or part of an underground structure is solved. The utility model adopts the technical proposal that: the utility model provides an underground structure that construction period need not to trade and prop which characterized in that: this underground structure periphery side construction has the round fender pile, and this fender pile inboard middle part is arranged and is regarded as fender pile bearing structure's enclosing purlin in the construction period, and the upper and lower surface of enclosing purlin is all pre-buried to have the reinforcing bar connector, encloses the lower part wall body that the purlin below linked up underground structure through the reinforcing bar connector, encloses the upper portion wall body that the purlin top linked up underground structure through the reinforcing bar connector.
Description
Technical Field
The utility model relates to an underground structure that need not to trade and prop during construction. The method is suitable for the technical field of foundation pit engineering.
Background
The inner support system is an important ring in foundation pit engineering. After the foundation pit is excavated, the soil pressure outside the pit is mainly balanced by the inner support system and is an important horizontal force transmission component. In common foundation pit engineering, the existence of interior support is bound to influence the pouring of vertical members such as underground structure outer wall, post, for making underground structure can upwards pour gradually, and interior support need be demolishd under specific condition, and this specific condition is to trade and prop the operating mode. In the common basement construction, the support changing working condition is that after horizontal members such as beams and plates on a certain horizontal plane of an underground structure are poured and maintained to the designed strength, certain measures are taken to connect the horizontal members with the fender post, the fender post replaces a supporting beam to transfer horizontal load, and then the nearest supporting beam above the fender post can be dismantled.
However, with the continuous abundance of urban functions and the continuous improvement of infrastructure, besides common industrial and civil buildings, cultural and municipal structures such as theaters and pump stations are increasing. Due to functional requirements, the underground structure of the structure is not provided with a middle beam and a floor slab, the excavation depth of the foundation pit is large, and the support changing working condition of the foundation pit is difficult to realize according to the traditional mode. Therefore, a support replacing mode applicable to foundation pits without intermediate beams and slab underground structures is urgently needed, and the feasibility of construction and the safety and reliability of excavation, dismantling and support replacing working conditions of the foundation pits are considered.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: aiming at the existing problems, the underground structure without the need of replacing the support in the construction period is provided, so that the technical problem that the support cannot be replaced under the condition of dismantling the support when the excavation depth of the foundation pit is large and the force transfer structures such as the middle plate and the middle beam do not exist on the whole or part of the underground structure is solved.
The utility model adopts the technical proposal that: the utility model provides an underground structure that need not to trade in construction period props which characterized in that: this underground structure periphery side construction has the round fender pile, and this fender pile inboard middle part is arranged and is regarded as fender pile bearing structure's enclosing purlin in the construction period, and the upper and lower surface of enclosing purlin is all pre-buried to have the reinforcing bar connector, encloses the lower part wall body that the purlin below linked up underground structure through the reinforcing bar connector, encloses the upper portion wall body that the purlin top linked up underground structure through the reinforcing bar connector.
The fender pile supporting structure comprises the surrounding purlins and supporting beams II connected with the surrounding purlins on the same high level, and the supporting beams II are detached after the top plate of the underground structure is poured.
And the main reinforcement of the fender post is welded with the steel bar of the purlin.
The fender pile adopts a rigid pile with stronger deformation resistance.
The utility model has the advantages that:
1. compared with the traditional mode of tearing open, trading and propping, the utility model provides an among the traditional technology, in the great and trade when lacking middle roof beam, board of foundation ditch excavation degree of depth prop technical problem, promptly the utility model is used for foundation ditch excavation stage and underground structure construction stage, especially underground structure burial depth is darker, and the foundation ditch excavation degree of depth that corresponds is big (be equivalent to multilayer basement excavation) underground structure wholly or partly does not have power transmission structure such as medium plate, middle roof beam, can't accomplish the biography power of trading and propping the operating mode under the circumstances of demolising the support.
2. The utility model has the advantages that the fender piles with stronger rigidity are arranged around the underground structure, so that the deformation can be better controlled, and the fender effect is achieved in the foundation pit excavation stage and the underground structure construction stage; the enclosing purlin serving as an enclosing pile supporting structure in the construction period and a supporting beam II connected with the enclosing purlin with the same elevation are arranged in the middle of the inner side of the enclosing pile, lateral soil pressure is transmitted by using the enclosing pile supporting structure (a reinforced concrete inner support), and the function of the enclosing pile supporting structure is fully utilized in a mode of temporarily retaining the temporary enclosing pile supporting structure, so that a large number of inclined cast supports are avoided, and a foundation pit can be smoothly excavated to the bottom of the pit; can regard as at underground structure construction stage and trade the brace component, when having avoided concrete to return and building, the operating mode of high cantilever appears in the fender pile, also can reduce engineering cost simultaneously.
3. The utility model discloses enclosing purlin and with the wall of elevation supporting beam II and underground structure, the pre-buried reinforcing bar of plane position that vertical member conflicts such as post plugs into the ware, rational utilization reinforcing bar plugs into the ware and has realized the upper and lower series connection of underground structure, the upper portion wall body and the lower part wall body that are about to the underground structure wall are through pre-buried on enclosing the purlin, the reinforcing bar of lower surface plugs into ware fixed connection, the side direction deformation in excavation and underground structure return stage has been controlled strictly, under the circumstances of enclosing purlin and corresponding high supporting beam II not demolising, it can continue upwards pour simultaneously to have realized the underground structure, the influence to all ring edge borders has also been reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment.
Fig. 2 is a plan view schematically showing the position of a first reinforced concrete support beam I in the embodiment.
FIG. 3 is a schematic plan view of the second pass and the position of the support beam II below the second pass in the embodiment.
In the figure: 1. an underground structure; 101. a lower wall body; 102. an upper wall; 2. a fender pile; 3. a crown beam; 4. a first reinforced concrete support beam I; 5. enclosing purlins; 6. a support beam II; 7. a steel bar connector.
Detailed Description
As shown in fig. 1, this embodiment is an underground structure that need not to change support during construction, have the bottom plate of underground structure, wall body and roof, it has fender pile 2 to establish the round at underground structure periphery side, fender pile inboard middle part has arranged the fender pile 5 as fender pile bearing structure and connects the supporting beam II6 of each fender pile 5 of same elevation during construction, correspond on the fender pile 5, lower upper portion wall 102 and the lower part wall 101 of pouring underground structure respectively, on the fender pile 5, the downside all pre-buried has steel bar connector 7, through steel bar connector 7 with on the fender pile 5, the downside respectively with upper portion wall 102, lower part wall 101 fixed connection, wherein fender pile 2 adopts the rigid pile of stronger anti deformability, the main muscle of fender pile 2 and the steel bar welded connection of fender pile 5.
This embodiment is before deep basal pit excavation, and the round fender pile 2 of establishing at underground structure periphery side is beaten, mainly plays the effect of retaining soil. When the deep foundation pit is excavated, firstly excavating the earthwork on the surface layer of the foundation pit, and pouring a crown beam 3 and a first reinforced concrete supporting beam I4 simultaneously as shown in figure 2, so that the crown beam and the first reinforced concrete supporting beam I form a unified whole, and the top end of the fender pile is embedded into the crown beam by about 100mm.
As shown in fig. 3, after excavating the earthwork in the foundation pit to the lower part of a second supporting beam II, pouring concrete with the same label as that of the underground structure to form a unified whole with the surrounding purlin and the second supporting beam II, embedding a reinforcing steel bar connector 7 at the plane position where the surrounding purlin and the second supporting beam II conflict with the wall (or column) of the underground structure, and then welding and connecting the main reinforcing steel bars of the surrounding piles with the reinforcing steel bars of the surrounding purlin; if the needed foundation pit is deeper, the supporting beams II below the second channel can be constructed in sequence until the construction is completed, and the final supporting beam II above the bottom plate of the underground structure and the pouring of the surrounding purlin are completed.
In the embodiment, in the stage of pouring the underground structure, after earth is excavated to the bottom surface of the foundation pit, a bottom plate of the underground structure is poured, and a gap between the bottom plate and the fender post is backfilled by plain concrete and is maintained to be more than 80% of the designed strength; under the condition that an upper purlin, a second purlin and a support beam II below the second purlin are not dismantled, a wall (or a column) of an underground structure is built back step by means of the connection effect of the steel bar connectors until the second purlin is built back to a certain position below the first reinforced concrete support beam I, a construction joint is reserved, and the purlin of a conflict part, the second purlin and the support beam II below the second purlin are poured into the wall of the underground structure together; and (3) removing the crown beam 3 and the first reinforced concrete support beam I, continuously building the underground structure upwards, completing the pouring of a top plate of the underground structure, and removing the surrounding purlin, the second reinforced concrete support beam I and the support beams II below the second reinforced concrete support beam I after the pouring of the top plate of the underground structure is completed.
This embodiment is used for underground structure buried depth, and its foundation ditch excavation degree of depth that corresponds is big (being equivalent to multilayer basement excavation) operating mode, and underground structure is because of the functional demand in later stage, and horizontal atress component only has roof and bottom plate, and intermediate position can't set up horizontal atress components such as intermediate beam, board, can't rely on permanent structure to accomplish the biography power when trading the bracing operating mode in the foundation ditch construction stage. The concrete construction steps are as follows:
1. before the excavation of the deep foundation pit, a circle of fender post 2 is arranged on the outer peripheral side of the underground structure 1 in advance, the fender post 2 needs to adopt a rigid post with strong deformation resistance, and the fender post plays a role in earth retaining in an earthwork excavation stage and an underground structure construction stage;
2. after the construction is finished, excavating the surface earthwork, simultaneously pouring the crown beam 3 and the first reinforced concrete supporting beam I4 to ensure that the crown beam 3 and the first reinforced concrete supporting beam I4 form a unified whole, and embedding the pile top of the fender post 2 into the crown beam 3 by about 100mm;
3. after the construction is finished, excavating earth to about 0.5m below a supporting beam II6 of a second channel, simultaneously adopting an enclosing purlin 5 with the same label as the underground structure 1 and the supporting beam II6 of the second channel, enabling the enclosing purlin 5 and the supporting beam II6 of the second channel to form a unified whole, embedding a steel bar connector 7 at a plane position where the enclosing purlin 5 and the supporting beam II6 of the second channel conflict with the wall body (or column) of the underground structure 1, and then welding and connecting a main steel bar of the enclosing pile 2 with a steel bar of the enclosing purlin 5;
4. when the supporting beam II6 below the second channel is constructed, the construction steps are repeated until the last supporting beam II6 above the bottom plate of the underground structure 1 and the surrounding purlin 5 are cast;
5. after the construction is finished, excavating earthwork in the foundation pit to the bottom surface of the foundation pit, pouring a bottom plate of the underground structure 1, backfilling gaps between the bottom plates and the fender posts 2 by using plain concrete, and maintaining the gaps to be more than 80% of the design strength;
6. after the construction is finished, under the condition that the upper surrounding purlin 5, the second surrounding purlin and the supporting beam II6 below the second surrounding purlin are not dismantled, the upper side and the lower side of the surrounding purlin 5 are connected with the upper wall body and the lower wall body by the steel bar connector 7, the wall body (or the column) of the underground structure 1 is gradually built back until the wall body (or the column) below the first reinforced concrete supporting beam I4 is built back, a construction joint is reserved, and the surrounding purlin 5, the second surrounding purlin and the supporting beam II6 below the second surrounding purlin of the conflicting part are together poured into the wall body (or the column) of the underground structure 1;
7. after the construction is finished, the crown beam 3 and the first reinforced concrete support beam I4 are dismantled, the underground structure 1 continues to be built upwards, the top plate of the underground structure 1 is poured, an integral structure with strong stability is formed together with the bottom plate and the wall body of the underground structure, and the integral structure can bear the surrounding water and soil pressure reliably and self-strength;
8. and after the construction is finished, removing the enclosing purlin 5, the second supporting beam II6 and the following supporting beams to finish the construction of the underground structure 1.
In the embodiment, the fender post 2, the crown beam 3, the first reinforced concrete supporting beam I4, the purlin 5 and the supporting beam II6 all belong to temporary structures, and are required to be respectively disabled along with the gradual forming of the underground structure 1 in the later period, be gradually dismantled along with the propelling of the construction, and be maintained to be more than 80% of the designed strength, so that the next construction can be carried out.
In the construction stage of the underground structure, the enclosing purlin 5 and the supporting beam II6 with the corresponding height play a role in support replacement, certain conflicts exist between the enclosing purlin 5, the second supporting beam II6 below the enclosing purlin and the wall (or column) of the underground structure 1 on the plane position, and the wall (or column) of the underground structure 1 cannot be continuously poured upwards under the condition that the enclosing purlin 5, the second supporting beam II below the second supporting beam II are not dismantled; if the surrounding purlin 5, the second supporting beam and the supporting beam II6 below the second supporting beam are removed in advance, the working condition that the cantilever of the surrounding pile 2 is overhigh can be caused, a temporary stress point does not exist in the middle, the stability and the safety of a foundation pit are not facilitated, and the construction in a traditional mode has the dilemma; therefore, in the embodiment, the up-and-down series connection of the underground structure 1 needs to be completed by the steel bar connector 7, the surrounding purlin 5 and the support beam II at the conflict part are poured into the wall (or column) of the underground structure 1 together, the lateral deformation in the excavation and underground structure back-building stage needs to be strictly controlled, and the problem that the underground structure can continue to be poured upwards under the condition that the surrounding purlin 5 and the support beam II with the corresponding height are not removed is solved.
The purlin 5 and the reinforced concrete support beam II with the corresponding height are used as temporary structures in the foundation pit construction stage, and need to be considered according to permanent structures in the underground structure construction stage (support changing working condition), and the rigidity and the strength of the purlin need to meet the foundation pit support requirement and the structural design requirement at the same time, and need to be designed according to the stronger of the two requirements. The top beam 3 and the first reinforced concrete supporting beam I4 do not need to be plugged into a connector by embedded steel bars, and can be normally dismantled under the condition of meeting the support changing condition, so that the construction of the underground structure is continued, the pouring of the top plate of the underground structure is completed, the top plate and the bottom plate and the outer wall of the basement form an integral structure with strong stability, and the self strength is reliable to bear the water and soil pressure around.
Claims (4)
1. The utility model provides an underground structure that construction period need not to trade and prop which characterized in that: this underground structure periphery side construction has round fender pile (2), and this fender pile inboard middle part has been arranged and has been regarded as fender pile bearing structure's enclosing purlin (5) in construction period, and enclosing purlin (5) upper and lower surface is all pre-buried has reinforcing bar connector (7), encloses purlin (5) below and plugs into lower part wall body (101) that ware (7) linked up underground structure through the reinforcing bar, encloses purlin (5) top and plugs into upper portion wall body (102) that ware (7) linked up underground structure through the reinforcing bar.
2. A construction-time shoring-free underground structure as in claim 1, wherein: the fender post bearing structure comprises the enclosing purlins (5) and supporting beams II (6) connected with the enclosing purlins (5) on the same high level, and the supporting beams II are dismantled after the top plate of the underground structure is poured.
3. A construction-time shoring-free underground structure as in claim 1, wherein: and main reinforcements of the fender piles (2) are connected with the steel bars of the surrounding purlins (5) in a welding mode.
4. A construction free bracing underground structure as claimed in claim 1, wherein: the fender pile (2) adopts a rigid pile with strong deformation resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220797068.7U CN218090882U (en) | 2022-04-08 | 2022-04-08 | Underground structure without replacing support in construction period |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220797068.7U CN218090882U (en) | 2022-04-08 | 2022-04-08 | Underground structure without replacing support in construction period |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218090882U true CN218090882U (en) | 2022-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220797068.7U Active CN218090882U (en) | 2022-04-08 | 2022-04-08 | Underground structure without replacing support in construction period |
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| Country | Link |
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| CN (1) | CN218090882U (en) |
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- 2022-04-08 CN CN202220797068.7U patent/CN218090882U/en active Active
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