CN212896374U - Foundation pit support structure located in underground space of existing building - Google Patents

Foundation pit support structure located in underground space of existing building Download PDF

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Publication number
CN212896374U
CN212896374U CN202020914621.1U CN202020914621U CN212896374U CN 212896374 U CN212896374 U CN 212896374U CN 202020914621 U CN202020914621 U CN 202020914621U CN 212896374 U CN212896374 U CN 212896374U
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China
Prior art keywords
partition
underground space
plate
envelope
existing building
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CN202020914621.1U
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Chinese (zh)
Inventor
顾宏
陈晖�
张勤羽
王克文
王笑
乔意
徐又新
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Shanghai Changkai Geotechnical Engineering Co Ltd
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Shanghai Changkai Geotechnical Engineering Co Ltd
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Abstract

The utility model discloses a be located existing building structure underground space's foundation ditch envelope, foundation ditch envelope includes the envelope through existing underground space and is located the partition wall of envelope both sides, the bottom of partition wall with the bottom plate looks fixed connection of basement, top with the roof looks fixed connection of basement. The utility model has the advantages that: the building envelope can ensure that the existing building (structure) can be transformed as required and is not damaged, can effectively implement the envelope structure according to the normal construction process, and has the advantages of simple required construction machinery, small operation difficulty, small construction measure cost, small influence on the surrounding environment and remarkable comprehensive effect.

Description

Foundation pit support structure located in underground space of existing building
Technical Field
The utility model belongs to the technical field of the underground construction, concretely relates to be located foundation ditch envelope in existing building underground space.
Background
At present, when a building envelope is constructed, an underground space of an existing building (structure) is often encountered, the underground space needs to be reserved outside a red line, and the inside of the red line needs to be detached or reserved, so that the construction of the building envelope is seriously hindered under the working condition. Under the circumstances, the conventional treatment measures are two, namely, the underground space structure in the red line is dismantled, or the construction area is planned again to bypass the existing underground space.
Disclosure of Invention
The utility model aims at providing a be located the foundation ditch envelope of existing structure underground space according to the weak point of above-mentioned prior art, this foundation ditch envelope is executed respectively through the both sides that treat the construction envelope region in underground space and is made the partition wall to normally construct envelope and through existing underground space under the circumstances of ensureing existing underground space structure safety.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the utility model provides a be located foundation ditch envelope of existing structure underground space, its characterized in that foundation ditch envelope include the envelope through existing underground space and be located the partition wall of envelope both sides, the bottom of partition wall with the bottom plate looks fixed connection of basement, the top with the roof looks fixed connection of basement.
The partition wall is a reinforced concrete partition wall or a brick-concrete partition wall.
And a plurality of groups of buttress columns are arranged at intervals along the extension direction of the partition wall, the buttress columns are tightly attached to the partition wall, the bottom end of the buttress columns is fixed on the bottom plate of the underground space, and the vertical section of each buttress column is in one or more combinations of a rectangle, a triangle and a trapezoid.
The supporting structure comprises an inclined strut and a force transmission body, the force transmission body is tightly attached to the partition wall, one end of the inclined strut is fixedly connected with the force transmission body, the other end of the inclined strut is fixedly connected with the bottom plate or the top plate, and the inclined strut and the force transmission body are one or more of steel pipes, channel steel and reinforced concrete rods.
And a cement paste reinforcing body is arranged below the bottom plate and positioned outside the enclosure structure.
And a concrete pile sealing body is arranged on the bottom plate outside the partition wall, a pile body is arranged below the concrete pile sealing body, and the pile body is connected with the bottom plate through the concrete pile sealing body to form an integral structure.
The utility model has the advantages that: the building envelope can ensure that the existing building (structure) can be transformed as required and is not damaged, can effectively implement the envelope structure according to the normal construction process, and has the advantages of simple required construction machinery, small operation difficulty, small construction measure cost, small influence on the surrounding environment and remarkable comprehensive effect.
Drawings
FIG. 1 is a schematic structural view of an existing building and an underground space below the existing building before construction in the utility model;
FIG. 2 is a schematic view of a construction partition in an underground space according to the present invention;
FIG. 3 is a schematic diagram of the construction of the present invention for reinforcing the soil under the bottom plate of the underground space;
fig. 4 is a schematic view of the utility model, wherein the enclosure is constructed in the space enclosed by the partition walls and a new basement is constructed;
FIG. 5 is a schematic diagram of the foundation underpinning and reinforcing of the underground space bottom plate of the present invention;
fig. 6 is the utility model discloses well foundation ditch envelope construction plan.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-6, the symbols in the drawings are: the construction method comprises the steps of existing construction 1, underground space 2, top plate 3, bottom plate 4, partition wall 5, building enclosure area 6 to be constructed, force transfer body 7, inclined strut 8, cement paste reinforcing body 9, building enclosure 10, bottom plate 11, new basement 12, concrete pile sealing body 13 and pile 14.
Example (b): as shown in fig. 3 and 4, the embodiment specifically relates to a foundation pit enclosure structure located in an underground space of an existing building, and the foundation pit enclosure structure passes through the underground space 2 of the existing building 1 and is used for providing corresponding support for a new basement 12 to be constructed subsequently, and mainly includes an enclosure structure 10 passing through the underground space 2 of the existing building 1 and partition walls 5 respectively arranged at two sides of the enclosure structure 10.
As shown in fig. 3 and 4, each partition wall 5 extends along the side edge of the building envelope 10, and the bottom of the partition wall 5 is fixedly disposed on the bottom plate 4 of the underground space 2, and the top of the partition wall 5 is fixedly disposed on the top plate 3 of the underground space 2. The partition wall 5 may be made of reinforced concrete or brick concrete, and the thickness of the partition wall 5 inside the enclosure 10 is controlled between the side edge of the enclosure 10 and the boundary line of the new basement 12 to be constructed later.
As shown in fig. 3, 4 and 5, in order to ensure the structural stability of the partition wall 5, several groups of buttress posts or support structures are arranged at intervals along the extension direction of the partition wall 5 to increase the resistance of the partition wall 5 against lateral forces;
the buttress columns are not shown in the drawing of the embodiment, the buttress columns are positioned on the outer side of the partition wall 5 and are arranged close to the partition wall 5, the bottom surfaces of the buttress columns are arranged on the bottom plate 4 of the underground space 2 in a clinging manner, and the vertical cross sections of the buttress columns can be in rectangular, triangular or trapezoidal shapes;
the supporting structure mainly comprises an inclined strut 8 and a force transmission body 7 in the embodiment, the force transmission body 7 is as high as the partition wall 5 and is arranged close to the outer side of the partition wall 5, and according to the actual engineering situation, if the inclined strut 8 is a single one, one end of the inclined strut 8 is fixedly connected with the force transmission body 7, and the other end of the inclined strut 8 is fixedly connected with the bottom plate 4 or the top plate 3 of the underground space 2; if two inclined struts 8 are adopted, one end of one inclined strut 8 is fixedly connected with the force transmission body 7, the other end of the inclined strut is fixedly connected with the bottom plate 4, one end of the other inclined strut 8 is fixedly connected with the force transmission body 7, and the other end of the inclined strut is fixedly connected with the top plate 3; in this embodiment, the diagonal brace 8 and the force transfer body 7 can be rigid members such as steel pipes, channel steel, reinforced concrete rods and the like; according to the actual situation of the supporting structure, an embedded part for fixedly connecting with the force transmission body 7 can be embedded in the partition wall 5, so that the stability of the whole structure between the force transmission body 7 and the partition wall 5 is enhanced.
As shown in fig. 3 and 4, in order to avoid that the construction equipment load may damage the in-situ space 2 and related structures and form potential safety hazards during the enclosure construction, the soil body below the bottom plate 4 is further reinforced or the foundation underpinned and reinforced; in order to further improve the bearing performance of the soil body on the bottom plate 4 of the underground space 2, a cement paste reinforcing body 9 is arranged in the soil body area below the bottom plate 4 of the underground space 2 and outside the building envelope 10. As shown in fig. 5, in addition to the reinforcement and reinforcement structure described above, a foundation underpinning reinforcement method may be employed in which the pile 14 is provided below the bottom plate 4 and the concrete pile 13 is provided at the upper end of the pile 14 to perform pile sealing so that the pile 14 is connected to the bottom plate 4 through the concrete pile 13 to form a whole.
As shown in fig. 1 to 6, the construction method of the foundation pit enclosure structure located in the underground space of the existing building structure in this embodiment mainly includes the following steps:
(1) as shown in fig. 1 and 2, an underground space 2 is arranged below an existing building 1, the position of a building envelope area 6 to be constructed, which passes through the existing underground space 2, is determined according to a construction design scheme, and the processing range of the underground space 2 on two sides of the building envelope area 6 to be constructed is determined.
(2) As shown in fig. 2, a partition wall 5 is respectively constructed on two sides of an enclosure area 6 to be constructed, the partition wall 5 is as close as possible to a side line of the enclosure area 6 to be constructed, the partition wall 5 can be a reinforced concrete structure or a brick concrete structure, the bottom of the partition wall 5 is fixedly arranged on a bottom plate 4 of an underground space 2, and the top of the partition wall is connected with a top plate 3 of the underground space 2; as shown in fig. 3, 4 and 5, in order to ensure the structural stability of the partition wall 5, several groups of buttress posts or support structures are arranged at intervals along the extension direction of the partition wall 5 to increase the resistance of the partition wall 5 against lateral forces;
the buttress columns are not shown in the drawing of the embodiment, the buttress columns are positioned on the outer side of the partition wall 5 and are arranged close to the partition wall 5, the bottom surfaces of the buttress columns are arranged on the bottom plate 4 of the underground space 2 in a clinging manner, and the vertical cross sections of the buttress columns can be in rectangular, triangular or trapezoidal shapes;
the supporting structure mainly comprises an inclined strut 8 and a force transmission body 7 in the embodiment, the force transmission body 7 is as high as the partition wall 5 and is arranged close to the outer side of the partition wall 5, and according to the actual engineering situation, if the inclined strut 8 is a single one, one end of the inclined strut 8 is fixedly connected with the force transmission body 7, and the other end of the inclined strut 8 is fixedly connected with the bottom plate 4 or the top plate 3 of the underground space 2; if two inclined struts 8 are adopted, one end of one inclined strut 8 is fixedly connected with the force transmission body 7, the other end of the inclined strut is fixedly connected with the bottom plate 4, one end of the other inclined strut 8 is fixedly connected with the force transmission body 7, and the other end of the inclined strut is fixedly connected with the top plate 3; in this embodiment, the diagonal brace 8 and the force transfer body 7 can be rigid members such as steel pipes, channel steel, reinforced concrete rods and the like; according to the actual situation of the supporting structure, an embedded part for fixedly connecting with the force transmission body 7 can be embedded in the partition wall 5, so that the stability of the whole structure between the force transmission body 7 and the partition wall 5 is enhanced.
(3) After the construction of the partition wall 5 and the buttress columns or the supporting structures is completed, in order to avoid the potential damage and potential safety hazard caused by the load of construction equipment to the in-situ space 2 and related structures during the enclosure construction, the soil body below the bottom plate 4 is further reinforced or the foundation underpinned and reinforced; simultaneously, reinforcing a top plate and a bottom plate of a corresponding construction area as required, and arranging an effective force transmission support; in actual construction, reinforcing or foundation underpinning reinforcing can be carried out firstly, and then the partition wall 5 is constructed, namely the steps (2) and (3) are interchanged.
As shown in fig. 3, if reinforcement is selected, the specific method of reinforcement is: on the bottom plate 4 at one side or two sides outside the building envelope area 6 to be constructed, a plurality of grouting holes are arranged at intervals along the extension direction of the partition wall 5, a drill rod with the grouting holes is adopted to drill downwards to a preset depth through the grouting holes, then high-pressure injection of cement paste is carried out to the periphery through the grouting holes in the drill rod, so that the cement paste and an underground soil body are consolidated into a whole to form a cement paste reinforcement body 9 shown in figure 3, the bearing capacity of the bottom plate 4 is effectively improved, the influence on the structural stability in the process of breaking the top plate 3 and the bottom plate 4 is avoided, and the subsidiary settlement or jacking damage of the original structure caused by the subsequent building envelope construction is avoided;
as shown in fig. 5, if the foundation underpinning reinforcement method is selected, the concrete method of foundation underpinning reinforcement is as follows: the method comprises the steps of forming pile pressing holes (not shown in the figure) in a bottom plate 4 on one side or two sides outside a building enclosure area 6 to be constructed, anchoring anchor rods on a peripheral bottom plate 4 of the pile pressing holes to erect a counter-force support, pressing a pile body 14 into a soil body below the bottom plate 4 through the pile pressing holes in a static pressure mode through the counter-force support until the designed depth is reached, wherein the pile body 14 is one of a reinforced concrete precast pile, a steel pipe pile and a steel member, setting concrete grout at the pile pressing holes to seal the pile, forming a concrete packaging body 13, and enabling the pile body 14 and the bottom plate 4 to be integrated to achieve foundation underpinning and reinforcement.
(4) As shown in fig. 4, the top plate 3 and the bottom plate 4 and other structures (e.g., pillars, structural walls, etc.) in the building envelope region 6 to be constructed are sequentially broken, and in order to avoid structural damage to the original structure when the original structure is broken, the original structure is generally cut and peeled by static cutting methods such as hydraulic breaking, rope saw cutting, diamond thin-wall drilling and gang hole cutting, and then broken and transported.
(5) As shown in fig. 4 and 5, after the top plate 3 and the bottom plate 4 are broken, the building envelope 10 is constructed in the enclosed space of the two partition walls 5, and a corresponding construction scheme is selected according to the type of the building envelope 10;
if the enclosure structure 10 is an underground continuous wall, excavating soil downwards in the enclosed space of the two partition walls 5 to the designed depth of the underground continuous wall, and then arranging a reinforcement cage and pouring cement paste to form the underground continuous wall;
if the enclosure structure 10 is a cement-soil mixing pile wall SMW construction method (or other stagnant water curtain + rigid soil retaining structures, the same applies below), the construction is carried out in the enclosed space of the two partition walls 5 to the design elevation of construction quality control of the SMW construction method in a mode of excavating soil downwards or tamping back filling soil upwards in layers, and then the construction of corresponding enclosure pile structures is completed in the two partition walls 5.
(6) After the construction of the enclosure structure 10 is completed, the supporting structure or the buttress columns on the partition wall 5 at the inner side of the enclosure structure 10 are firstly removed to prevent the subsequent construction of a new basement 12 from being influenced, then the original bottom plate 4 of the underground space 2 in the range enclosed by the enclosure structure 10 is removed, the construction of the new basement 12 is carried out, and a new bottom plate 11 is formed.
The beneficial effects of the embodiment are as follows: the building envelope can ensure that the existing building (structure) can be transformed as required and is not damaged, can effectively implement the envelope structure according to the normal construction process, and has the advantages of simple required construction machinery, small operation difficulty, small construction measure cost, small influence on the surrounding environment and remarkable comprehensive effect.

Claims (6)

1. The utility model provides a be located foundation ditch envelope of existing structure underground space, its characterized in that foundation ditch envelope include the envelope through existing underground space and be located the partition wall of envelope both sides, the bottom of partition wall with underground space's bottom plate looks fixed connection, the top with underground space's roof looks fixed connection.
2. A foundation pit enclosure in the underground space of an existing building structure according to claim 1, wherein the partition is a reinforced concrete partition or a brick-concrete partition.
3. A foundation pit support structure located in an underground space of an existing building structure according to claim 1, wherein a plurality of groups of buttress columns are arranged at intervals along the extension direction of the partition wall, the buttress columns are arranged close to the partition wall, the bottom ends of the buttress columns are fixed on a bottom plate of the underground space, and the vertical cross sections of the buttress columns are in one or more combinations of a rectangle, a triangle and a trapezoid.
4. A foundation pit enclosure structure in the underground space of existing building structures according to claim 1, wherein a plurality of groups of supporting structures are arranged at intervals along the extending direction of the partition wall, the supporting structures comprise inclined struts and force transfer bodies, the force transfer bodies are arranged close to the partition wall, one ends of the inclined struts are fixedly connected with the force transfer bodies, the other ends of the inclined struts are fixedly connected with the bottom plate or the top plate, and the inclined struts and the force transfer bodies are one or more combinations of steel pipes, channel steel and reinforced concrete rods.
5. A foundation pit enclosure in the underground space of an existing building structure according to claim 1 wherein grout reinforcement is provided under the floor and outside the enclosure.
6. A foundation pit support structure located in the underground space of existing building structure according to claim 1, wherein the bottom plate located outside the partition wall is provided with concrete pile sealing bodies, and pile bodies are arranged below the concrete pile sealing bodies and connected with the bottom plate through the concrete pile sealing bodies to form an integral structure.
CN202020914621.1U 2020-05-27 2020-05-27 Foundation pit support structure located in underground space of existing building Active CN212896374U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020914621.1U CN212896374U (en) 2020-05-27 2020-05-27 Foundation pit support structure located in underground space of existing building

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020914621.1U CN212896374U (en) 2020-05-27 2020-05-27 Foundation pit support structure located in underground space of existing building

Publications (1)

Publication Number Publication Date
CN212896374U true CN212896374U (en) 2021-04-06

Family

ID=75265850

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020914621.1U Active CN212896374U (en) 2020-05-27 2020-05-27 Foundation pit support structure located in underground space of existing building

Country Status (1)

Country Link
CN (1) CN212896374U (en)

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