CN112177013A - Precast concrete non-primary support system for foundation pit engineering and construction method thereof - Google Patents
Precast concrete non-primary support system for foundation pit engineering and construction method thereof Download PDFInfo
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- CN112177013A CN112177013A CN202011007314.6A CN202011007314A CN112177013A CN 112177013 A CN112177013 A CN 112177013A CN 202011007314 A CN202011007314 A CN 202011007314A CN 112177013 A CN112177013 A CN 112177013A
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- 239000011178 precast concrete Substances 0.000 title claims abstract description 199
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000012407 engineering method Methods 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 144
- 239000010959 steel Substances 0.000 claims abstract description 144
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000003825 pressing Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 239000003351 stiffener Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a precast concrete non-primary support system for foundation pit engineering and a construction method thereof, wherein the precast concrete non-primary support system comprises a precast concrete support, a precast concrete waist beam and a support structure; the inner side of the enclosure structure is provided with a precast concrete waist beam, the precast concrete waist beam is supported on a steel bracket, and the steel bracket is fixedly connected with the enclosure structure; two ends of the precast concrete support are respectively connected with precast concrete waist beams on two sides of the precast concrete support through connecting joints; the precast concrete wale on one side of the precast concrete support is propped against the envelope structure, and the precast concrete wale on the other side of the precast concrete support is tightly propped against the envelope structure through the steel plate wedge and is poured with concrete grouting material. The invention can not only adjust construction errors and installation errors to enable two ends of the precast concrete support to be tightly propped against the enclosure structure, thereby ensuring the safety of the foundation pit, but also facilitate the later chiseling of the poured concrete grouting material, and realize the repeated recycling of precast concrete components.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a precast concrete non-primary support system for foundation pit engineering and a construction method thereof.
Background
The supporting type retaining structure mainly comprises a retaining component and a support, wherein the retaining component is most commonly a cast-in-situ bored pile, an underground continuous wall and the like. The supporting type retaining structure is definite in stress, relatively mature in calculation method and engineering practice, suitable for deep foundation pits of various geological conditions and most reliable in supporting structure form at present. At present, a first support in a support type supporting and retaining structure is supported by reinforced concrete mostly, the support and a crown beam form a whole, deformation resistance is high, and integral damage caused by skirting at the lower part of a foundation pit can be avoided. The first reinforced concrete support is constructed by adopting cast-in-place concrete mostly, the construction process is complex, the speed is slow, the concrete support is a temporary structure, and the concrete support needs to be chiseled out and cannot be recycled at the later stage, so that a large amount of redundant waste building rubbish is formed, resources are wasted, and the environment is polluted; generally, when the soil condition is good, the second and the following supports can adopt steel supports, but when the soil condition is poor, a plurality of concrete supports also need to be designed, but the problems exist in the first concrete support.
Therefore, there is a need for a precast concrete non-primary support system for foundation pit engineering and a construction method thereof, which overcome the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a precast concrete non-primary support system for foundation pit engineering and a construction method thereof, which can meet the use requirement of a foundation pit, ensure quick and convenient construction and can be recycled and reused in the later period.
In order to achieve the purpose, the technical scheme of the invention is a precast concrete non-primary support system for foundation pit engineering, which comprises a precast concrete support, a precast concrete waist beam and a support structure; the inner side of the enclosure structure is provided with a precast concrete waist beam, the precast concrete waist beam is supported on a steel bracket, and the steel bracket is fixedly connected with the enclosure structure; two ends of the precast concrete support are respectively connected with precast concrete waist beams on two sides of the precast concrete support through connecting joints; the precast concrete wale on one side of the precast concrete support is propped against the enclosure structure, and the precast concrete wale on the other side of the precast concrete support is tightly propped against the enclosure structure through a steel plate wedge and poured with concrete grouting material.
Furthermore, an embedded steel plate is embedded in the inner wall of the enclosure structure, one side of the embedded steel plate is connected with a plurality of anchor bars, and the other side of the embedded steel plate is tightly propped against the precast concrete waist beam through a steel plate wedge; the anchor bars are embedded in the envelope structure in advance.
Further, the steel bracket comprises a supporting steel plate, a connecting steel plate and a stiffening plate; the connecting steel plate is vertically arranged and connected with an embedded part in the enclosure structure; the supporting steel plate is horizontally arranged and connected with the top of the connecting steel plate; the bottom surface of the supporting steel plate is connected with the connecting steel plate through a stiffening plate; the precast concrete wale is supported on the support steel plate.
Furthermore, a plurality of precast concrete supports are arranged in the enclosure structure at intervals along the horizontal direction, and the precast concrete supports are formed by splicing a plurality of sections of precast concrete supports through connecting joints.
Furthermore, the lengths of the multiple sections of precast concrete supports are completely different or not completely the same; and the abutted seams of the adjacent precast concrete supports are not on the same straight line.
Further, the connecting joint comprises two fixing pieces and a connecting piece for connecting the two fixing pieces; the two fixing pieces are respectively fixed at the ends of the two precast concrete members to be connected.
Furthermore, the connecting piece comprises two first steel plates which are oppositely arranged, the two first steel plates are connected through the section steel, and the two first steel plates are respectively connected with the two fixing pieces.
Furthermore, the fixing piece comprises a second steel plate and an embedded bolt; the second steel plate is fixed on the end face of the precast concrete member, and the embedded bolt is embedded in the precast concrete member and penetrates through the second steel plate; the second steel plate is connected with the first steel plate through embedded bolts.
Furthermore, the second steel plate is welded with a shear key, the end part of the precast concrete member is correspondingly provided with a groove, and the shear key is installed in the groove.
The invention also provides a construction method of the precast concrete non-primary support system for the foundation pit engineering, which comprises the following steps:
1) prefabricating a plurality of sections of precast concrete supporting pieces, precast concrete waist beams, steel corbels and connecting joints in a factory, and transporting to a construction site;
2) when the building enclosure is constructed, pre-embedding an embedded part on the building enclosure; after the building enclosure is constructed, fixedly connecting the steel corbel with the embedded part;
3) hoisting the precast concrete wales, placing the precast concrete wales on the steel corbels, and then respectively connecting the precast concrete wales on the two sides with the precast concrete supporting pieces through connecting joints;
4) splicing the precast concrete supporting pieces into a precast concrete support through a connecting joint;
5) and supporting the precast concrete wale on one side of the precast concrete support against the enclosure structure, inserting a steel plate wedge between the precast concrete wale on the other side and the enclosure structure for pressing, and pouring and compacting through concrete grouting materials.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the precast concrete wale on one side of the precast concrete support is propped against the enclosure structure, the precast concrete wale on the other side of the precast concrete support is propped against the enclosure structure through the steel plate wedge, and the concrete grouting material is poured between the precast concrete wale and the enclosure structure, so that on one hand, the construction error and the installation error can be adjusted, two ends of the precast concrete support are propped against the enclosure structure, the construction safety of a foundation pit is ensured, on the other hand, plain concrete is poured between the precast concrete wale and the enclosure structure, so that chiseling is convenient for later period, the repeated recycling of precast concrete components is realized, and the resource waste and the environmental pollution are reduced;
(2) the precast concrete supports are connected with the precast concrete wales and the precast concrete support pieces through the connecting joints by bolts, so that the precast concrete support is simple and rapid to install and disassemble and convenient to construct, and the precast concrete members cannot be damaged in the disassembling process, so that the precast concrete members can be recycled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a plan view of a precast concrete non-primary support system for foundation pit engineering provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a precast concrete non-primary support system for foundation pit engineering according to an embodiment of the present invention;
FIG. 3 is a sectional view of a steel corbel of a precast concrete non-primary support system for foundation pit engineering according to an embodiment of the present invention;
fig. 4 is a plan view of a joint of a precast concrete non-primary support system for foundation pit engineering according to an embodiment of the present invention;
FIG. 5 is a view A-A of FIG. 4;
FIG. 6 is a view B-B of FIG. 4;
in the figure: 1. prefabricating a concrete support; 11. a first precast concrete support; 12. a second precast concrete support; 2. prefabricating a concrete waist beam; 3. connecting a joint; 31. a first steel plate; 32. a second steel plate; 33. section steel; 34. an X-direction stiffener; 35. a Y-direction stiffener; 36. a shear key; 37. embedding bolts in advance; 4. a steel plate wedge; 5. steel corbels; 51. a support steel plate; 52. connecting steel plates; 53. a stiffening plate; 6. an enclosure structure; 61. pre-burying a steel plate; 62. anchoring ribs; 63. embedding parts; 7. concrete grouting material; 8. a retaining wall.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to fig. 3, the embodiment provides a precast concrete non-primary support system for foundation pit engineering, which includes a precast concrete support 1, a precast concrete wale 2, and a support structure 6; the inner side of the enclosure structure 6 is provided with a precast concrete wale 2, the precast concrete wale 2 is supported on a steel corbel 5, and the steel corbel 5 is fixedly connected with the enclosure structure 6; two ends of the precast concrete support 1 are respectively connected with precast concrete wales 2 at two sides of the precast concrete support through connecting joints 3; the precast concrete wale 2 of one side of the precast concrete support 1 is propped against the enclosure structure 6, and the precast concrete wale 2 of the other side of the precast concrete support 1 is tightly propped against the enclosure structure 6 through the steel plate wedge 4 and is poured with a concrete grouting material 7. In this embodiment, the precast concrete wale 2 of one side of the precast concrete support 1 is supported on the enclosure structure 6, and the precast concrete wale 2 of the other side is tightly supported on the enclosure structure 6 through the steel plate wedge 4 and poured with the concrete grouting material 7, so that the construction error and the installation error can be adjusted, the two ends of the precast concrete support 1 are supported on the enclosure structure 6, the construction safety of a foundation pit is ensured, plain concrete is poured between the precast concrete wale 2 and the enclosure structure 6, and the construction is convenient for later-stage removal, repeated recycling of precast concrete members is realized, and the resource waste and the environmental pollution are reduced.
The precast concrete support 1 in this embodiment may be square or circular; the structure can be solid or hollow.
Furthermore, an embedded steel plate 61 is embedded in the inner wall of the enclosure structure 6, one side of the embedded steel plate 61 is connected with a plurality of anchor bars 62, and the other side of the embedded steel plate 61 is tightly propped against the precast concrete wale 2 through a steel plate wedge 4; the anchor bars 62 are pre-embedded in the envelope 6. As shown in fig. 3, in the embodiment, the embedded steel plate 61 is embedded at a position of the enclosure 6 corresponding to the upper portion of the precast concrete wale 2, so that when the steel plate wedge 4 is inserted between the top of the precast concrete wale 2 and the embedded steel plate 61 to tightly push the precast concrete support 1, the concrete structure of the enclosure 6 is not damaged.
Further, the steel bracket 5 includes a support steel plate 51, a connection steel plate 52 and a stiffening plate 53; the connecting steel plate 52 is vertically arranged and connected with an embedded part 63 in the enclosure structure 6; the supporting steel plate 51 is horizontally arranged and connected with the top of the connecting steel plate 52; the bottom surface of the supporting steel plate 51 is connected with the connecting steel plate 52 through a stiffening plate 53; the precast concrete wale 2 is supported on the support steel plate 51. As shown in fig. 3, the embedded part 63 of the embodiment includes a fixed steel plate fixed on the inner wall of the enclosure 6 and a bolt embedded in the enclosure 6, and one end of the bolt extends out of the enclosure 6 and sequentially penetrates through the fixed steel plate and the connecting steel plate 52 to be fixed by a nut. The steel corbel 5 in the embodiment is a steel structural member, the steel corbel 5 is connected with the embedded part 63 in the enclosure structure through the bolt, the installation and the disassembly are simple and quick, the construction is convenient, the enclosure structure 6 cannot be damaged in the disassembly process, the steel corbel 5 cannot be damaged, and the steel corbel 5 can be recycled.
Furthermore, a plurality of precast concrete supports 1 are arranged in the enclosure structure 6 at intervals along the horizontal direction, and the precast concrete supports 1 are formed by splicing a plurality of sections of precast concrete supports through connecting joints 3. At least one layer of wale is arranged in the enclosure structure 6 at intervals along the height direction of the enclosure structure in the embodiment, each layer of wale is formed by splicing precast concrete wales 2, a plurality of precast concrete supports 1 are supported in each layer of wale, and the precast concrete supports 1 are arranged at intervals along the horizontal direction.
Furthermore, the lengths of the multiple sections of precast concrete supports are completely different or not completely the same; and the abutted seams of the adjacent precast concrete supports are not on the same straight line. In this embodiment, each piece of the multi-section precast concrete supporting member of the precast concrete support is not in the same straight line with each piece of the multi-section precast concrete supporting member of the precast concrete support, so that the safety risk of foundation pit construction is reduced. As a specific embodiment, as shown in fig. 1, the precast concrete supports 1 are formed by splicing a first precast concrete support 11 and a second precast concrete support 12 with different lengths through a connecting joint 3, and the first precast concrete support 11 and the second precast concrete support 12 of the precast concrete supports 1 adjacent in the horizontal direction and the vertical direction are opposite in left and right positions, so that the connecting nodes of the first precast concrete support 11 and the second precast concrete support 12 of the precast concrete supports 1 in the horizontal direction and the vertical direction are not on the same straight line.
Further, the connecting joint 3 comprises two fixing pieces and a connecting piece for connecting the two fixing pieces; the two fixing pieces are respectively fixed at the ends of the two precast concrete members to be connected. In the embodiment, the precast concrete member comprises a precast concrete support 1 and a precast concrete wale 2, wherein the precast concrete support 1 comprises a plurality of sections of precast concrete supporting pieces; the precast concrete wale 2 and the precast concrete support piece of this embodiment all adopt the prefabricated component form, can be in factory batch production, deliver to the scene again and assemble, can improve production efficiency, and the quality is reliable, saves labour, saves the template, can also shorten the time limit for a project, is applicable to in the all kinds of foundation ditch engineering of building.
Furthermore, the connecting member includes two first steel plates 31 disposed opposite to each other, the two first steel plates 31 are connected by a section steel 33, and the two first steel plates 31 are respectively connected with the two fixing members. As shown in fig. 4 to 6, the two first steel plates 31 of the connecting member of the present embodiment are connected by the section steel 33, the section steel 33 may be in various forms such as a rectangular steel pipe, an i-shaped steel pipe, a circular steel pipe, a cross-shaped steel pipe, etc., and the outer wall of the section steel 33 is connected to the first steel plates 31 by the X-direction stiffener plate 34 and the Y-direction stiffener plate 35.
As an embodiment, the fixing member includes a second steel plate 32 and embedded bolts 37; the second steel plate 32 is fixed on the end face of the precast concrete member, and the embedded bolt 37 is embedded in the precast concrete member and penetrates through the second steel plate 32; the second steel plate 32 is connected with the first steel plate 31 through embedded bolts 37. As shown in fig. 4 to 6, a plurality of bolt holes are formed in each of the first steel plate 31 and the second steel plate 32 of this embodiment, a plurality of embedded bolts 37 are embedded in the precast concrete member, the embedded bolts 37 correspond to the bolt holes one to one, and one end of each embedded bolt 37 extends out of the precast concrete member and sequentially passes through the second steel plate 32 and the first steel plate 31 to be fixed by a nut.
As another embodiment, the fixing member includes a plurality of embedded sleeves and bolts, the end of the precast concrete member is embedded with the embedded sleeves, bolt holes are formed in the first steel plate 31 at positions corresponding to the embedded sleeves, and the bolts penetrate the bolt holes in the first steel plate 31 and then are screwed into the embedded sleeves, so that the fixing member is connected with the connecting member.
Among two kinds of embodiments above, the connecting piece is the steel construction spare, and the mounting of connecting piece on with the precast concrete component passes through bolted connection, not only the installation with dismantle simple swift, convenient construction, neither can destroy precast concrete component in dismantling the process moreover, also can not destroy the connecting piece, make precast concrete component and connecting piece all can reuse material saving.
Furthermore, the second steel plate 32 is welded with a shear key 36, and a groove is correspondingly formed at the end of the precast concrete member, and the shear key 36 is installed in the groove. In the embodiment, the shear key 36 is welded on one side of the second steel plate 32 facing the precast concrete member, and the shear key 36 is arranged in the groove at the end part of the precast concrete member, so that the effects of resisting the shear force and limiting the displacement of the end part are achieved; the shear key 36 may be made of various types of steel, such as rectangular steel pipe, i-steel, circular steel pipe, channel steel, angle steel, cross-shaped steel, and may also be made of anchor bars.
The embodiment also provides a construction method of the precast concrete non-primary support system for foundation pit engineering, which comprises the following steps:
1) leveling a field, constructing a fence, moving and modifying pipelines and dredging traffic; then constructing a dewatering well and an enclosure structure 6 (enclosure piles, underground continuous walls and the like), and embedding an embedded part 63 on the enclosure structure 6 when the enclosure structure 6 is constructed; then carrying out foundation pit pre-precipitation to ensure that the water level is 1m below the substrate;
2) after the building envelope 6 reaches the design strength, excavating a foundation pit to a position 0.5m below the first support, and constructing a crown beam and a first concrete support; then excavating the foundation pit to a position 0.5m below the second support;
3) prefabricating a plurality of sections of precast concrete supporting pieces, precast concrete waist beams 2, steel corbels 5 and connecting joints 3 in a factory, and transporting to a construction site;
4) fixedly connecting the steel bracket 5 with the embedded part 63 through bolts;
5) hoisting the precast concrete wales 2, placing the precast concrete wales on the steel corbels 5, and then respectively connecting the precast concrete wales 2 on the two sides with the precast concrete supporting pieces through the connecting joints 3;
6) splicing the precast concrete supporting pieces into a precast concrete support 1 through connecting joints 3 by adopting bolts;
7) the precast concrete wale 2 on one side of the precast concrete support 1 is tightly propped against the enclosure structure 6, a steel plate wedge 4 is inserted between the precast concrete wale 2 on the other side and the enclosure structure 6 to be tightly propped, and the precast concrete wale is poured and grouted through a concrete grouting material 7;
8) the third and fourth supporting construction processes below the second support are the same as the steps 3) -7).
The dismantling sequence of the precast concrete non-primary support system for foundation pit engineering described in this embodiment is as follows:
1) loosening the bolts for connecting the steel corbels 5, and removing the steel corbels 5 below the concrete grouting material 7;
2) chiseling plain concrete grouting material 7 and steel plate wedge 4;
3) and loosening bolts of the connecting joints 3, removing the connecting joints 3 between the precast concrete supports 1 and the precast concrete wales 2 and the connecting joints 3 between the precast concrete supports, and recovering the first precast concrete support 11, the second precast concrete support 12, the connecting joints 3 and the steel corbels 5.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a non-first support system of foundation ditch engineering precast concrete which characterized in that: the prefabricated concrete beam comprises a prefabricated concrete support, a prefabricated concrete waist beam and a building envelope; the inner side of the enclosure structure is provided with a precast concrete waist beam, the precast concrete waist beam is supported on a steel bracket, and the steel bracket is fixedly connected with the enclosure structure; two ends of the precast concrete support are respectively connected with precast concrete waist beams on two sides of the precast concrete support through connecting joints; the precast concrete wale on one side of the precast concrete support is propped against the enclosure structure, and the precast concrete wale on the other side of the precast concrete support is tightly propped against the enclosure structure through a steel plate wedge and poured with concrete grouting material.
2. The precast concrete non-primary support system for foundation pit engineering according to claim 1, wherein: an embedded steel plate is also embedded in the inner wall of the enclosure structure, one side of the embedded steel plate is connected with a plurality of anchor bars, and the other side of the embedded steel plate is tightly propped against the precast concrete waist beam through a steel plate wedge; the anchor bars are embedded in the envelope structure in advance.
3. The precast concrete non-primary support system for foundation pit engineering according to claim 1, wherein: the steel bracket comprises a supporting steel plate, a connecting steel plate and a stiffening plate; the connecting steel plate is vertically arranged and connected with an embedded part in the enclosure structure; the supporting steel plate is horizontally arranged and connected with the top of the connecting steel plate; the bottom surface of the supporting steel plate is connected with the connecting steel plate through a stiffening plate; the precast concrete wale is supported on the support steel plate.
4. The precast concrete non-primary support system for foundation pit engineering according to claim 1, wherein: a plurality of precast concrete supports are arranged in the enclosure structure at intervals along the horizontal direction, and the precast concrete supports are formed by splicing a plurality of sections of precast concrete supporting pieces through connecting joints.
5. The precast concrete non-primary support system for foundation pit engineering according to claim 4, wherein: the lengths of the multiple sections of precast concrete supporting pieces are completely different or not completely the same; and the abutted seams of the adjacent precast concrete supports are not on the same straight line.
6. The precast concrete non-primary support system for foundation pit engineering according to claim 1 or 4, wherein: the connecting joint comprises two fixing pieces and a connecting piece for connecting the two fixing pieces; the two fixing pieces are respectively fixed at the ends of the two precast concrete members to be connected.
7. The precast concrete non-primary support system for foundation pit engineering according to claim 6, wherein: the connecting piece comprises two first steel plates which are oppositely arranged, the two first steel plates are connected through profile steel, and the two first steel plates are respectively connected with the two fixing pieces.
8. The precast concrete non-primary support system for foundation pit engineering according to claim 7, wherein: the fixing piece comprises a second steel plate and an embedded bolt; the second steel plate is fixed on the end face of the precast concrete member, and the embedded bolt is embedded in the precast concrete member and penetrates through the second steel plate; the second steel plate is connected with the first steel plate through embedded bolts.
9. The precast concrete non-primary support system for foundation pit engineering according to claim 8, wherein: the second steel plate is welded with a shear key, the end part of the precast concrete member is correspondingly provided with a groove, and the shear key is arranged in the groove.
10. A construction method of the precast concrete non-primary support system for foundation pit engineering according to any one of claims 1 to 9, characterized by comprising the following steps:
1) prefabricating a plurality of sections of precast concrete supporting pieces, precast concrete waist beams, steel corbels and connecting joints in a factory, and transporting to a construction site;
2) when the building enclosure is constructed, pre-embedding an embedded part on the building enclosure; after the building enclosure is constructed, fixedly connecting the steel corbel with the embedded part;
3) hoisting the precast concrete wales, placing the precast concrete wales on the steel corbels, and then respectively connecting the precast concrete wales on the two sides with the precast concrete supporting pieces through connecting joints;
4) splicing the precast concrete supporting pieces into a precast concrete support through a connecting joint;
5) and supporting the precast concrete wale on one side of the precast concrete support against the enclosure structure, inserting a steel plate wedge between the precast concrete wale on the other side and the enclosure structure for pressing, and pouring and compacting through concrete grouting materials.
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| CN202011007314.6A CN112177013A (en) | 2020-09-23 | 2020-09-23 | Precast concrete non-primary support system for foundation pit engineering and construction method thereof |
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| CN202011007314.6A CN112177013A (en) | 2020-09-23 | 2020-09-23 | Precast concrete non-primary support system for foundation pit engineering and construction method thereof |
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- 2020-09-23 CN CN202011007314.6A patent/CN112177013A/en active Pending
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| CN109457708A (en) * | 2018-12-14 | 2019-03-12 | 中冶天工集团有限公司 | The construction method of temporary support in a kind of deep foundation ditch concrete structure construction procedure |
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