WO2020140405A1 - Foundation pit retaining structure system and construction method therefor - Google Patents

Foundation pit retaining structure system and construction method therefor Download PDF

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Publication number
WO2020140405A1
WO2020140405A1 PCT/CN2019/092630 CN2019092630W WO2020140405A1 WO 2020140405 A1 WO2020140405 A1 WO 2020140405A1 CN 2019092630 W CN2019092630 W CN 2019092630W WO 2020140405 A1 WO2020140405 A1 WO 2020140405A1
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Prior art keywords
pile
cast
place
foundation pit
occluded
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PCT/CN2019/092630
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French (fr)
Chinese (zh)
Inventor
龚剑
颜超
张竹庭
周婉
钟铮
林巧
颜正红
王新新
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上海建工集团股份有限公司
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Publication of WO2020140405A1 publication Critical patent/WO2020140405A1/en

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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

Definitions

  • the invention relates to the technical field of building construction, in particular to a foundation pit envelope structure system and a construction method thereof.
  • the underground structure of traditional newly developed buildings generally only uses the foundation pit enclosure structure of the underground continuous wall, which has the defects of long construction period, high engineering cost, and poor reliability and stability.
  • the foundation pit enclosure structure of existing buildings generally only uses underground continuous walls. Therefore, when transforming the underground space of existing buildings, it is necessary to The depth of the foundation pit is further deepened.
  • the insertion depth of the foundation pit envelope structure of the original underground continuous wall cannot guarantee the safe excavation of the foundation pit and the safe construction of the underground structure during the transformation process
  • the new underground continuous wall is used as the enclosing structure of the foundation pit reconstruction, it will bring unfavorable factors such as high cost and long construction period, and cannot fully utilize the original enclosing structure, so how to study a
  • a technical system that needs to be solved by those skilled in the art to solve the foundation pit envelope structure system and construction method in such construction projects is an urgent need for those skilled in the art.
  • the purpose of the present invention is to provide a foundation pit envelope structure system and its construction method to solve the technical problems of long construction period, high engineering cost, and poor reliability and stability.
  • the present invention provides a foundation pit enclosure structure system, including an underground continuous wall, an occluded cast-in-place pile located on one side of the underground continuous wall, and the depth of the occluded-cast pile is greater than the underground continuous
  • the top of the occluded cast-in-place pile is provided with a second compression top beam, and two of the second compression top beam
  • a first reserved steel bar and a second reserved steel bar are respectively provided at the ends, the second pressure top beam is anchored to the underground continuous wall through the first reserved steel bar, and the second pressure top beam is passed through the second reserved steel bar
  • foundation pit enclosure structure system provided by the present invention includes a wall-base structural panel located between the underground continuous walls.
  • the wall-based structural panel includes at least a B0-layer wall-based structural panel and a B1-layer wall-based structural panel.
  • the top of the underground continuous wall is provided with a first pressed roof beam, and the B0 layer wall base structural plate is provided on the first pressed roof beam.
  • foundation pit enclosure structure system provided by the present invention includes a pile foundation structural plate located between the bite-type cast-in-place piles.
  • the pile foundation structural plate at least includes a B2 layer pile foundation structural plate, a B3 layer pile foundation structural plate and a bottom pile foundation structural plate.
  • the B2 layer pile foundation structural plate is located on the second top beam, and the B2 layer pile foundation structural plate is to be formed for the corresponding layer of the second top beam Pile foundation structural plate.
  • a column pile is provided below the bottom pile foundation structure plate.
  • the occluded cast-in-place pile includes multiple cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped.
  • the present invention also provides a construction method of the foundation pit envelope structure system
  • the plain concrete cast-in-place pile section of the bite-in-place cast-in-place pile is removed, and a second compression top beam is constructed on the top of the reinforced concrete injection pile section of the articulated-infusion pile, so that both ends of the second compression top beam are respectively provided with first reserved steel bars And the second reserved steel bar, and the second pressure top beam is anchored to the underground continuous wall through the first reserved steel bar.
  • the plain concrete cast-in-place pile section in the bite-in-place cast-in-place pile is gradually removed between the underground continuous walls Construction wall base structure board;
  • the second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
  • the plain concrete cast-in-place pile section in the bite-in-place cast-in-place pile is gradually removed;
  • the second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
  • the foundation pit enclosure structure system and its construction method provided by the present invention are a composite structure composed of an underground continuous wall, a compacted grouting layer and an occluded cast-in-place pile.
  • the strength and strength of the foundation pit enclosure structure system of the composite structure The stability is much greater than that of a single foundation pit envelope structure such as an underground continuous wall.
  • the bite-type cast-in-place pile provided by the invention has the advantages of safety, reliability, stability, short construction period, low engineering cost and little influence of soil quality of the foundation pit.
  • the present invention effectively utilizes the advantages of both the rigidity of the underground continuous wall and the quick construction of the occluded cast-in-place pile through the combination of the underground continuous wall and the occluded cast-in-place pile, and has good earth-retaining and water-stop effects; At the same time, when the depth of the existing underground continuous wall is insufficient, the deformation of the foundation pit is effectively controlled, the cost of technical measures is reduced, and the project progress is accelerated.
  • the present invention anchors into the underground continuous wall through the first reserved steel bar of the second pressure top beam.
  • the foundation pit enclosure is ensured
  • the continuity, overall stability and safety of the structure of the protective structure can effectively control the deformation of the foundation pit.
  • the invention fills the gap between the underground continuous wall and the occluded cast-in-place pile through the pressure grouting layer to ensure the reliability and stability of the foundation pit enclosure structure system, and avoids the underground continuous wall in the gap
  • the situation of mutual deformation with the occluded cast-in-place pile, and the compacted grouting layer does not need to perform the drilling process between the underground continuous wall and the occluded cast-in-place pile, which can overcome the high-pressure rotary jet pile grouting caused by the underground continuous wall and the cast-in-place pile Of the structure is destroyed, therefore, the stability of the present invention is higher.
  • the invention extends the insertion depth of a single underground continuous wall enclosure structure in an existing building through a bite-type cast-in-place pile with a depth greater than the underground continuous wall, thereby ensuring the safety of the above-ground structure and the construction of the underground structure to ensure The safety of excavation and construction work of underground construction.
  • the invention is applicable to the newly developed underground structure of buildings and also to the reconstruction of underground structures of existing buildings. In the reconstruction of the underground structure of existing buildings, the reuse of the single original foundation pit envelope structure such as the underground continuous wall reduces the disturbance to the surrounding environment and achieves the purpose of green environmental protection recycling.
  • FIG. 1 is a schematic diagram of a foundation pit enclosure structure system and underground structure according to an embodiment of the present invention
  • FIG. 2 is a partial structural diagram of a foundation pit enclosure structure system and underground structure according to an embodiment of the present invention
  • FIG. 3 is an enlarged cross-sectional view at C-C in FIG. 2;
  • FIG. 4 is a schematic structural diagram of a foundation pit enclosure structure system according to an embodiment of the present invention.
  • FIG. 5 is an enlarged cross-sectional view of the occluded cast-in-place pile in FIG. 4 along A-A;
  • FIG. 6 is an enlarged cross-sectional view of the occluded cast-in-place pile along B-B in FIG. 4;
  • FIG. 7 to 8 are schematic diagrams of the construction process of an underground structure according to an embodiment of the present invention.
  • Second reserved steel bar 150, wall-based structural panel, 151, B0-layered wall-based structural panel, 152, B1-layered wall-based structural panel, 160, first top beam, 170, pile-based structural panel, 171, B2 Layer pile foundation structural board, 172, B3 layer pile foundation structural board, 173, bottom pile foundation structural board, 180, column pile, 190 support column, 200, ground level.
  • an embodiment of the present invention provides a foundation pit enclosure structure system 100, including an underground continuous wall 110, an occluded cast-in-place pile 120 on one side of the underground continuous wall 110, the occluded infusion
  • the depth of the pile 120 is greater than the depth of the underground continuous wall 110, and the compacted grouting layer 130 located in the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120;
  • the underground continuous wall 110 is anchored and connected, and the second top beam 140 is anchored and connected to the pile foundation structural plate to be formed by the second reserved steel bar 142 and its corresponding layer.
  • the foundation pit enclosure structure system 100 of the embodiment of the present invention is a superimposed structure composed of an underground continuous wall 110, a compacted grouting layer 130 and an occluded cast-in-place pile 120. Its strength and stability are much greater than that of an underground continuous wall Wait for a single foundation pit envelope structure.
  • the bite-type cast-in-place pile 120 provided by the embodiment of the present invention has the advantages of safety, reliability, stability, short construction period, low engineering cost and little influence of soil quality of the foundation pit.
  • the present invention uses the combination of the underground continuous wall 110 and the occluded cast-in-place pile 120, that is, it effectively utilizes the advantages of both the large rigidity of the underground continuous wall and the quick construction of the occluded-in-situ pile 120, and has good earth retaining and stopping Water effect; at the same time, under the condition that the existing underground continuous wall 110 has insufficient insertion depth, it effectively controls the deformation of the foundation pit, reduces the cost of technical measures, and accelerates the progress of the project.
  • the first reserved steel bar 141 of the second compression beam 140 is anchored into the underground continuous wall 110, which is compared with the method of connecting the foundation pit envelope structure with the to-be-formed structural plate by using diagonal rods in the prior art.
  • the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120 is compacted and grouted through the compacted grouting layer 130 to ensure the reliability and stability of the foundation pit enclosure structure system.
  • the embodiment of the present invention extends the insertion depth of a single underground continuous wall enclosure structure in an existing building through a bite-type cast-in-place pile with a depth greater than the underground continuous wall, thereby ensuring the safety of the above-ground structure and the construction of the underground structure.
  • the interface between the above-ground structure and the underground structure refers to the ground plane 200 as a reference.
  • the invention is applicable to the newly developed underground structure of buildings and also to the reconstruction of underground structures of existing buildings.
  • the reuse of the single original foundation pit envelope structure such as the underground continuous wall reduces the disturbance to the surrounding environment and achieves the purpose of green environmental protection recycling.
  • the foundation pit enclosure structure system 100 provided by an embodiment of the present invention includes a wall-based structural panel 150 located between the underground continuous walls 110, and the wall-based structural panel 150 at least It includes a B0 layer wall-based structural panel 151 and a B1 layer wall-based structural panel 152.
  • the top of the underground continuous wall 110 is provided with a first depressing beam 160, and the B0 layer wall base structural plate 151 is provided on the first depressing beam 160.
  • the foundation pit enclosure structure system 100 includes a pile foundation structural plate 170 between the bite-type cast-in-place piles 120.
  • the pile foundation structural plate 170 at least includes a B2 layer pile foundation structural plate 171, a B3 layer pile foundation structural plate 172, and a bottom pile foundation structural plate 173.
  • the B2 layer pile foundation structural plate 171 is located on the second top beam 140.
  • the B2 layer pile foundation structural plate 171 is a pile foundation structural plate to be formed in the corresponding layer of the second top beam 140.
  • the B3 layer pile foundation structural plate 172 and the bottom pile foundation structural plate 173 are located between the occluded cast-in-place piles 120.
  • the underground structure of the embodiment of the present invention includes, but is not limited to, 4 floors, including a 2-layer wall base structure consisting of a B0 layer wall base structural panel 151, a B1 layer wall base structural panel 152, and a B2 layer pile base structural panel 171, and a B2 substructure A two-layer pile base structure consisting of a layer pile foundation structural plate 171, a B3 layer pile foundation structural plate 172 and a bottom pile foundation structural plate 173.
  • a 2-layer wall base structure consisting of a B0 layer wall base structural panel 151, a B1 layer wall base structural panel 152, and a B2 layer pile base structural panel 171, and a B2 substructure
  • a two-layer pile base structure consisting of a layer pile foundation structural plate 171, a B3 layer pile foundation structural plate 172 and a bottom pile foundation structural plate 173.
  • a foundation pit envelope structure system 100 provided by an embodiment of the present invention
  • a column pile 180 is provided below the bottom pile foundation structural plate 173.
  • Support columns 190 are evenly distributed between the wall-based structural panels 150, between the pile-based structural panels 170, and between the wall-based structural panels 150 and the pile-based structural panels 170.
  • the column pile 180 is used to ensure the stability of the underground structure.
  • the support column 190 is used to protect the stability between the structural plates of each layer.
  • the occluded cast-in-place pile 120 includes a plurality of cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped to form an occluded infusion Pile 120.
  • an embodiment of the present invention also provides a construction method of a foundation pit enclosure structure system 100, including the following steps:
  • Step 1 construct an occluded cast-in-place pile 120 on one side of the underground continuous wall 110, so that the depth of the occluded cast-in-place pile 120 is greater than the depth of the underground continuous wall 110, and form the occluded in-situ pile 120 on the top Part of the plain concrete cast-in-place pile section 121 and the reinforced concrete cast-in-place pile section 122 at the lower part, the length of the reinforced concrete cast-in-place pile section 122 is longer than that of the plain concrete in-situ pile section 121; the occluded cast-in-place pile 120 may be formed in the underground continuous wall 110
  • the inner side or the outer side of the embodiment of the present invention preferably uses the inner side, so that the formed pile foundation structural panel 170 is a tightening structure relative to the wall-based structural panel 150, thereby ensuring the stability of the foundation pit enclosure structure system and the underground structure.
  • the occluded cast-in-place pile 120 is constructed at a distance of 300 mm to 400 mm from the inside of the underground continuous wall. Before drilling, steel with an inner diameter larger than the pile diameter of 100 mm to 200 mm is used. The casing is pre-buried. Among them, please refer to FIG. 5, the plain concrete cast-in-place pile section 121 is a plurality of cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped. Referring to Fig. 6, reinforced concrete cast-in-place pile section 122 is formed between two adjacent plain concrete-filled pile sections 121, thereby forming an occlusal structure.
  • the reinforced concrete cast-in-place pile section 122 is composed of concrete 1221 and steel bars 1222. Please refer to FIG. 4, the plain concrete cast-in-place pile section 121 and the reinforced concrete cast-in-place pile section 122 are divided by a dividing line 123.
  • Step 2 A compacted grouting layer 130 is formed in the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120.
  • the purpose is to fill and compact, to ensure the continuity of the force transmission between the combined structure of the underground continuous wall 110 and the occluded cast-in-place pile 120, and to give full play to the overall effect of the folded envelope structure.
  • Step 3 please refer to FIG. 1 to FIG. 4, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is removed, and the second compression roof beam 140 is constructed on top of the reinforced concrete cast-in-place pile section 122 of the occluded in-situ pile 120.
  • a first reserved steel bar 141 and a second reserved steel bar 142 are respectively provided at both ends of the second top beam 140, and the second top beam 140 is anchored to the underground continuous wall 110 through the first reserved bar 141.
  • the second reserved steel bar is 3 ⁇ 3 ⁇ 16@200, anchored into the ground connection wall and filled with HILTI RE-500 concrete to reinforce the holes, so that the underground continuous wall 110 and the occluded cast-in-place pile 120 pile form a complete linkage system.
  • the construction method of the foundation pit enclosure structure system 100 provided by the embodiment of the present invention further includes:
  • Step 4 please refer to FIG. 4, FIG. 7 to FIG. 8, during the excavation of the foundation pit, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is gradually removed between the underground continuous walls 110 Construction wall base structure board 150.
  • the B0-layer wall base structural panel 151 can be constructed when the foundation pit is excavated to about 1.5m below the B1-layer wall base structural panel 152, and the B0 layer wall base structural panel 151 can be used to resist the foundation pit enclosure structure system. Lateral pressure; construct B0-layer wall base structural panel 151 on the first top beam 160 to ensure its stability and control the top displacement of the underground continuous wall 110.
  • Step 5 please refer to FIG. 1 to FIG. 3, the pile foundation structural plate 170 is constructed between the occluded cast-in-place piles 120 with reinforced concrete cast-in-place pile sections 122;
  • the purpose is to increase the stability of the foundation pit enclosure structure system formed by the underground continuous wall 110, the occluded cast-in-place pile 120 and the compacted grouting layer 130.
  • the implementation methods of steps 4 to 5 are applicable to the foundation pit envelope structure system of new construction.
  • the construction method of the foundation pit enclosure structure system 100 provided by the embodiment of the present invention further includes
  • Step 4' during the excavation of the foundation pit, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is gradually removed;
  • Step 5' a pile foundation structural panel 170 is constructed between the occluded cast-in-place piles 120 with reinforced concrete cast-in-place pile sections 122; the pile foundation structure formed by the second top beam 140 and its corresponding layer through the second reserved steel bar 142 Board anchor connection. That is, the second top beam 140 is anchored and connected to the B2 layer pile foundation structural plate through the second reserved steel bar 142.
  • the purpose is to increase the stability of the foundation pit enclosure structure system formed by the underground continuous wall 110, the occluded cast-in-place pile 120 and the compacted grouting layer 130.
  • steps 4 to 5 are applicable to the foundation pit enclosure structure system of new construction.
  • the implementation of steps 4'and 5' is applicable to the reconstruction of the underground structure of existing buildings.
  • the second top beam 140 is anchored and connected to the underground continuous wall 110 through the first reserved steel bar 141, and the second top beam 140 is to be formed on the corresponding layer through the second reserved steel bar 142 Anchoring connection of the pile foundation structural plate.
  • the priority first reserved steel bar 141 is three, but not limited to three.
  • the foundation pit enclosure structure system of the embodiment of the present invention is combined with the "reverse construction" construction of the underground structure, without the need for internal support, which is convenient for mechanized and rapid construction, does not affect the construction of the next procedure, saves the construction period, and avoids blasting, disassembly, support, etc. to the environment The impact brought about by green construction.
  • the core of the present invention is to adopt a superimposed form of underground continuous wall, occluded cast-in-place pile and compacted grouting, combined with earthwork excavation and construction of underground structure, to form a combined effect of superimposed envelope structure and underground structure system.
  • the embodiment of the present invention is a superimposed envelope structure that can solve the insufficient insertion depth of the existing envelope structure in deep and large foundation pit projects. It is a combination of an underground continuous wall, occluded cast-in-place piles and compacted grouting. And through step-by-step excavation and step-by-step construction of the structural layer, the entire envelope structure is formed into a complete stable system, which solves the problems of insufficient stability and tight construction period in deep and large foundation pit reconstruction.
  • the embodiment of the present invention is particularly suitable for the foundation pit reconstruction project using the original underground continuous wall, which has the advantages of green environmental protection, availability, convenient construction, clear and reliable stress, and cost saving. Problems such as insufficient stability of the pit, high requirements for deformation control, tight construction period, and high requirements for the quality of the underground structure have practical significance.

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Abstract

Disclosed are a foundation pit retaining structure system and a construction method therefor. The system comprises an underground diaphragm wall; a secant bored concrete pile located at one side of the underground diaphragm wall, wherein the depth of the secant bored concrete pile is greater than the depth of the underground diaphragm wall; and a compacted grouting layer located in a gap between the underground diaphragm wall and the secant bored concrete pile, wherein a second coping beam is arranged on the top of the secant bored concrete pile, two ends of the second coping beam are provided with a first reserved steel bar and a second reserved steel bar respectively, the second coping beam is anchored in the underground diaphragm wall by means of the first reserved steel bar, and the second coping beam is anchored, by means of the second reserved steel bar, to a pile foundation structure plate to be formed in a corresponding layer of the second coping beam. The present invention has the effects of a short construction period, low engineering cost, high reliability and good stability.

Description

基坑围护结构体系及其施工方法Foundation pit enclosure structure system and construction method 技术领域Technical field
本发明涉及建筑施工技术领域，特别涉及一种基坑围护结构体系及其施工方法。The invention relates to the technical field of building construction, in particular to a foundation pit envelope structure system and a construction method thereof.
背景技术Background technique
近年来，随着我国城市化规划的不断加快和深入，伴随着土地资源的日渐紧缺，在新开发的建筑物中增大了地下结构的设计和施工。传统的新开发的建筑物的地下结构一般仅采用地下连续墙的基坑围护结构，其存在施工周期长、工程造价高、可靠性和稳定性较差的缺陷。对于古建筑、老建筑等既有建筑物的保护施工中，由于既有建筑物的基坑围护结构一般仅采用地下连续墙，因而在对既有建筑物的地下空间进行改造时，需要对基坑的深度进一步加深处理，当基坑深度加深时，原有地下连续墙方式的基坑围护结构的***深度就不能保证在改造过程中基坑安全开挖和地下结构安全施工以及无法保证地上结构的安全性，若采用新的地下连续墙作为基坑改造的围护结构必将带来造价高、工期长等不利的因素，而且不能够充分利用原有围护结构，因此如何研究一种能解决此类建筑工程中的基坑围护结构体系及施工方法，是本领域技术人员亟需解决的技术问题。In recent years, with the continuous acceleration and deepening of my country's urbanization planning, along with the increasing shortage of land resources, the design and construction of underground structures have been increased in newly developed buildings. The underground structure of traditional newly developed buildings generally only uses the foundation pit enclosure structure of the underground continuous wall, which has the defects of long construction period, high engineering cost, and poor reliability and stability. For the protection construction of existing buildings such as ancient buildings and old buildings, the foundation pit enclosure structure of existing buildings generally only uses underground continuous walls. Therefore, when transforming the underground space of existing buildings, it is necessary to The depth of the foundation pit is further deepened. When the depth of the foundation pit is deepened, the insertion depth of the foundation pit envelope structure of the original underground continuous wall cannot guarantee the safe excavation of the foundation pit and the safe construction of the underground structure during the transformation process For the safety of the above-ground structure, if the new underground continuous wall is used as the enclosing structure of the foundation pit reconstruction, it will bring unfavorable factors such as high cost and long construction period, and cannot fully utilize the original enclosing structure, so how to study a A technical system that needs to be solved by those skilled in the art to solve the foundation pit envelope structure system and construction method in such construction projects is an urgent need for those skilled in the art.
发明内容Summary of the invention
本发明的目的在于提供了一种基坑围护结构体系及其施工方法，以解决施工周期长、工程造价高、可靠性和稳定性较差的技术问题。The purpose of the present invention is to provide a foundation pit envelope structure system and its construction method to solve the technical problems of long construction period, high engineering cost, and poor reliability and stability.
为了解决上述技术问题，本发明提供一种基坑围护结构体系，包括地下连续墙，位于所述地下连续墙一侧的咬合式灌注桩，所述咬合式灌注桩的深度大于所述地下连续墙的深度，以及位于所述地下连续墙和咬合式灌注桩之间缝隙内的压密注浆层；所述咬合式灌注桩的顶部设置有第二压顶梁，所述第二压顶梁的两端分别设置有第一预留钢筋和第二预留钢筋，所述第二压顶梁通过第一 预留钢筋与所述地下连续墙锚入连接，所述第二压顶梁通过第二预留钢筋与其对应层待形成的桩基结构板锚入连接。In order to solve the above technical problems, the present invention provides a foundation pit enclosure structure system, including an underground continuous wall, an occluded cast-in-place pile located on one side of the underground continuous wall, and the depth of the occluded-cast pile is greater than the underground continuous The depth of the wall, and the compacted grouting layer located in the gap between the underground continuous wall and the occluded cast-in-place pile; the top of the occluded cast-in-place pile is provided with a second compression top beam, and two of the second compression top beam A first reserved steel bar and a second reserved steel bar are respectively provided at the ends, the second pressure top beam is anchored to the underground continuous wall through the first reserved steel bar, and the second pressure top beam is passed through the second reserved steel bar Anchor connection of the pile foundation structural plate to be formed with its corresponding layer.
进一步的，本发明提供的基坑围护结构体系，包括位于所述地下连续墙之间的墙基结构板。Further, the foundation pit enclosure structure system provided by the present invention includes a wall-base structural panel located between the underground continuous walls.
进一步的，本发明提供的基坑围护结构体系，所述墙基结构板至少包括B0层墙基结构板和B1层墙基结构板。Further, in the foundation pit enclosure structure system provided by the present invention, the wall-based structural panel includes at least a B0-layer wall-based structural panel and a B1-layer wall-based structural panel.
进一步的，本发明提供的基坑围护结构体系，所述地下连续墙的顶部设置有第一压顶梁，所述B0层墙基结构板设置在所述第一压顶梁上。Further, in the foundation pit envelope structure system provided by the present invention, the top of the underground continuous wall is provided with a first pressed roof beam, and the B0 layer wall base structural plate is provided on the first pressed roof beam.
进一步的，本发明提供的基坑围护结构体系，包括位于所述咬合式灌注桩之间的桩基结构板。Further, the foundation pit enclosure structure system provided by the present invention includes a pile foundation structural plate located between the bite-type cast-in-place piles.
进一步的，本发明提供的基坑围护结构体系，所述桩基结构板至少包括B2层桩基结构板、B3层桩基结构板和底层桩基结构板。Further, in the foundation pit retaining structure system provided by the present invention, the pile foundation structural plate at least includes a B2 layer pile foundation structural plate, a B3 layer pile foundation structural plate and a bottom pile foundation structural plate.
进一步的，本发明提供的基坑围护结构体系，所述B2层桩基结构板位于所述第二压顶梁上，所述B2层桩基结构板为所述第二压顶梁对应层待形成的桩基结构板。Further, in the foundation pit envelope structure system provided by the present invention, the B2 layer pile foundation structural plate is located on the second top beam, and the B2 layer pile foundation structural plate is to be formed for the corresponding layer of the second top beam Pile foundation structural plate.
进一步的，本发明提供的基坑围护结构体系，所述底层桩基结构板下方设置有立柱桩。Further, in the foundation pit enclosure structure system provided by the present invention, a column pile is provided below the bottom pile foundation structure plate.
进一步的，本发明提供的基坑围护结构体系，所述咬合式灌注桩包括多根灌注桩，相邻两根灌注桩部分重合设置。Further, in the foundation pit envelope structure system provided by the present invention, the occluded cast-in-place pile includes multiple cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped.
为了解决上述技术问题，本发明还供一种基坑围护结构体系的施工方法，In order to solve the above technical problems, the present invention also provides a construction method of the foundation pit envelope structure system,
在地下连续墙的一侧施工咬合式灌注桩，使所述咬合式灌注桩的深度大于所述地下连续墙的深度，并且使所述咬合式灌注桩形成位于上部分的素混凝土灌注桩段和位于下部分的钢筋混凝土灌注桩段，所述钢筋混凝土灌注桩段的长度大于素混凝土灌注桩段；Construct an occluded cast-in-place pile on one side of the underground continuous wall so that the depth of the occluded cast-in-place pile is greater than the depth of the underground continuous wall, and form the occluded cast-in-place pile into a plain concrete cast-in-place pile section at the upper part and A reinforced concrete cast-in-place pile section located at the lower part, the reinforced concrete cast-in-place pile section is longer than the plain concrete cast-in-place pile section;
在地下连续墙和咬合式灌注桩之间的缝隙形成压密注浆层；Forming a compacted grouting layer between the gap between the underground continuous wall and the occluded cast-in-place pile;
去除所述咬合式灌注桩中的素混凝土灌注桩段，在咬合式灌注桩的钢筋混凝土灌注桩段的顶部施工第二压顶梁，使第二压顶梁的两端分别设置有第一预留钢筋和第二预留钢筋，通过第一预留钢筋使第二压顶梁与地下连续墙锚入连接。The plain concrete cast-in-place pile section of the bite-in-place cast-in-place pile is removed, and a second compression top beam is constructed on the top of the reinforced concrete injection pile section of the articulated-infusion pile, so that both ends of the second compression top beam are respectively provided with first reserved steel bars And the second reserved steel bar, and the second pressure top beam is anchored to the underground continuous wall through the first reserved steel bar.
进一步的，本发明提供的基坑围护结构体系的施工方法，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩中的素混凝土灌注桩段，在所述地下连续墙之间施工墙基结构板；Further, in the construction method of the foundation pit envelope structure system provided by the present invention, during the excavation of the foundation pit, the plain concrete cast-in-place pile section in the bite-in-place cast-in-place pile is gradually removed between the underground continuous walls Construction wall base structure board;
在具有钢筋混凝土灌注桩段的咬合式灌注桩之间施工桩基结构板；Construction of pile foundation structural plates between occluded cast-in-place piles with reinforced concrete cast-in-place pile sections;
通过第二预留钢筋使所述第二压顶梁与其对应层形成的桩基结构板锚入连接。The second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
进一步的，本发明提供的基坑围护结构体系的施工方法，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩中的素混凝土灌注桩段；Further, in the construction method of the foundation pit envelope structure system provided by the present invention, during the excavation of the foundation pit, the plain concrete cast-in-place pile section in the bite-in-place cast-in-place pile is gradually removed;
在具有钢筋混凝土灌注桩段的咬合式灌注桩之间施工桩基结构板；Construction of pile foundation structural plates between occluded cast-in-place piles with reinforced concrete cast-in-place pile sections;
通过第二预留钢筋使所述第二压顶梁与其对应层形成的桩基结构板锚入连接。The second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
本发明提供的基坑围护结构体系及其施工方法，由地下连续墙、压密注浆层和咬合式灌注桩构成的叠合式结构，该叠合式结构的基坑围护结构体系的强度和稳定性，远远大于地下连续墙等单一的基坑围护结构。本发明提供的咬合式灌注桩具有安全、可靠、稳定以及施工周期短、工程造价低和受基坑土质影响小的优点。本发明通过地下连续墙和咬合式灌注桩组合方式，即有效利用了既有地下连续墙刚度大的优点，又利用了咬合式灌注桩施工快捷的优点，具有良好的挡土和止水效果；同时在既有地下连续墙***深度不足的情况下，有效的控制了基坑变形、降低技术措施费、加快工程进度。本发明通过第二压顶梁的第一预留钢筋锚入地下连续墙，与现有技术中采用斜拉杆连接基坑围护结构与待形成的层结构板的方式相比，保证了基坑围护结构体系在受力传递的连续性、整体稳定性和安全性，能够有效控制基坑变形。本发明通过压密注浆层对地下连续墙和咬合式灌注桩之间的缝隙进行压密注浆填充，保证了基坑围护结构体系的可靠性和稳定性，避免在缝隙内地下连续墙和咬合式灌注桩相互变形的情况，而且压密注浆层无需在地下连续墙和咬合式灌注桩之间进行钻孔工艺，能够克服高压旋喷桩注浆时对地下连续墙和灌注桩造成的结构破坏，因此，本发明的稳固性更高。本发明通过深度大于地下连续墙的咬合式灌注桩，从而延伸了既有建筑物中单一的地下连续墙围护结构的***深度，从而保障地上结构的安全性以及对地下结构进行施工，以保障地下施工的基坑开挖和施工作业的 安全性。本发明即适用于新开发的建筑物地下结构，也适用于既有建筑物的地下结构改造施工。在既有建筑物的地下结构改造施工中，对地下连续墙等单一的原始基坑围护结构的再利用，减小了对周边环境的扰动，实现了绿色环保循环使用的目的。The foundation pit enclosure structure system and its construction method provided by the present invention are a composite structure composed of an underground continuous wall, a compacted grouting layer and an occluded cast-in-place pile. The strength and strength of the foundation pit enclosure structure system of the composite structure The stability is much greater than that of a single foundation pit envelope structure such as an underground continuous wall. The bite-type cast-in-place pile provided by the invention has the advantages of safety, reliability, stability, short construction period, low engineering cost and little influence of soil quality of the foundation pit. The present invention effectively utilizes the advantages of both the rigidity of the underground continuous wall and the quick construction of the occluded cast-in-place pile through the combination of the underground continuous wall and the occluded cast-in-place pile, and has good earth-retaining and water-stop effects; At the same time, when the depth of the existing underground continuous wall is insufficient, the deformation of the foundation pit is effectively controlled, the cost of technical measures is reduced, and the project progress is accelerated. The present invention anchors into the underground continuous wall through the first reserved steel bar of the second pressure top beam. Compared with the prior art method of connecting the foundation pit enclosure structure with the to-be-formed structural plate by using diagonal rods, the foundation pit enclosure is ensured The continuity, overall stability and safety of the structure of the protective structure can effectively control the deformation of the foundation pit. The invention fills the gap between the underground continuous wall and the occluded cast-in-place pile through the pressure grouting layer to ensure the reliability and stability of the foundation pit enclosure structure system, and avoids the underground continuous wall in the gap The situation of mutual deformation with the occluded cast-in-place pile, and the compacted grouting layer does not need to perform the drilling process between the underground continuous wall and the occluded cast-in-place pile, which can overcome the high-pressure rotary jet pile grouting caused by the underground continuous wall and the cast-in-place pile Of the structure is destroyed, therefore, the stability of the present invention is higher. The invention extends the insertion depth of a single underground continuous wall enclosure structure in an existing building through a bite-type cast-in-place pile with a depth greater than the underground continuous wall, thereby ensuring the safety of the above-ground structure and the construction of the underground structure to ensure The safety of excavation and construction work of underground construction. The invention is applicable to the newly developed underground structure of buildings and also to the reconstruction of underground structures of existing buildings. In the reconstruction of the underground structure of existing buildings, the reuse of the single original foundation pit envelope structure such as the underground continuous wall reduces the disturbance to the surrounding environment and achieves the purpose of green environmental protection recycling.
附图说明BRIEF DESCRIPTION
图1是本发明一实施例的基坑围护结构体系及地下结构的示意图；1 is a schematic diagram of a foundation pit enclosure structure system and underground structure according to an embodiment of the present invention;
图2是本发明一实施例的基坑围护结构体系及地下结构的局部结构示意图；2 is a partial structural diagram of a foundation pit enclosure structure system and underground structure according to an embodiment of the present invention;
图3是图2中C-C处的剖面放大图；FIG. 3 is an enlarged cross-sectional view at C-C in FIG. 2;
图4是本发明一实施例的基坑围护结构体系的结构示意图；4 is a schematic structural diagram of a foundation pit enclosure structure system according to an embodiment of the present invention;
图5是图4中咬合式灌注桩沿A-A处的剖面放大图；5 is an enlarged cross-sectional view of the occluded cast-in-place pile in FIG. 4 along A-A;
图6是图4中咬合式灌注桩沿B-B处的剖面放大图；6 is an enlarged cross-sectional view of the occluded cast-in-place pile along B-B in FIG. 4;
图7至图8是本发明一实施例的地下结构的施工过程示意图。7 to 8 are schematic diagrams of the construction process of an underground structure according to an embodiment of the present invention.
图中所示：100、基坑围护结构体系，110、地下连续墙，120、咬合式灌注桩，130、压密注浆层，140、第二压顶梁，141、第一预留钢筋，142、第二预留钢筋，150、墙基结构板，151、B0层墙基结构板，152、B1层墙基结构板，160、第一压顶梁，170、桩基结构板，171、B2层桩基结构板，172、B3层桩基结构板，173、底层桩基结构板，180、立柱桩，190支撑柱，200、地平面。Shown in the picture: 100, foundation pit enclosure structure system, 110, underground continuous wall, 120, occluded cast-in-place pile, 130, compacted grouting layer, 140, second top beam, 141, first reserved steel bar, 142. Second reserved steel bar, 150, wall-based structural panel, 151, B0-layered wall-based structural panel, 152, B1-layered wall-based structural panel, 160, first top beam, 170, pile-based structural panel, 171, B2 Layer pile foundation structural board, 172, B3 layer pile foundation structural board, 173, bottom pile foundation structural board, 180, column pile, 190 support column, 200, ground level.
具体实施方式detailed description
下面结合附图对本发明作详细描述：The present invention will be described in detail below in conjunction with the drawings:
请参考图1至图8，本发明实施例提供一种基坑围护结构体系100，包括地下连续墙110，位于所述地下连续墙110一侧的咬合式灌注桩120，所述咬合式灌注桩120的深度大于所述地下连续墙110的深度，以及位于所述地下连续墙110和咬合式灌注桩120之间缝隙内的压密注浆层130；所述咬合式灌注桩120的顶部设置有第二压顶梁140，所述第二压顶梁140的两端分别设置有第一预留钢筋141和第二预留钢筋142，所述第二压顶梁140通过第一预留钢筋141与所述地下连续墙110锚入连接，所述第二压顶梁140通过第二预留钢筋142与其对应层待形成的桩基结构板锚入连接。1-8, an embodiment of the present invention provides a foundation pit enclosure structure system 100, including an underground continuous wall 110, an occluded cast-in-place pile 120 on one side of the underground continuous wall 110, the occluded infusion The depth of the pile 120 is greater than the depth of the underground continuous wall 110, and the compacted grouting layer 130 located in the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120; There is a second pressing beam 140, and a first reserved steel bar 141 and a second reserved steel bar 142 are provided at both ends of the second pressing beam 140, respectively, The underground continuous wall 110 is anchored and connected, and the second top beam 140 is anchored and connected to the pile foundation structural plate to be formed by the second reserved steel bar 142 and its corresponding layer.
本发明实施例的基坑围护结构体系100，为由地下连续墙110、压密注浆层130和咬合式灌注桩120构成的叠合式结构，其强度和稳定性，远远大于地下连续墙等单一的基坑围护结构。本发明实施例提供的咬合式灌注桩120具有安全、可靠、稳定以及施工周期短、工程造价低和受基坑土质影响小的优点。本发明通过地下连续墙110和咬合式灌注桩120组合方式，即有效利用了既有地下连续墙刚度大的优点，又利用了咬合式灌注桩120施工快捷的优点，具有良好的挡土和止水效果；同时在既有地下连续墙110***深度不足的情况下，有效的控制了基坑变形、降低技术措施费、加快工程进度。本发明实施例通过第二压顶梁140的第一预留钢筋141锚入地下连续墙110，与现有技术中采用斜拉杆连接基坑围护结构与待形成的层结构板的方式相比，保证了基坑围护结构体系在受力传递的连续性、整体稳定性和安全性，能够有效控制基坑变形。本发明实施例通过压密注浆层130对地下连续墙110和咬合式灌注桩120之间的缝隙进行压密注浆压实填充，保证了基坑围护结构体系的可靠性和稳定性，避免在缝隙内地下连续墙110和咬合式灌注桩120相互变形的情况，而且压密注浆层130无需在地下连续墙110和咬合式灌注桩120之间进行钻孔工艺，能够克服高压旋喷桩注浆时对地下连续墙和灌注桩造成的结构破坏，因此，本发明的稳固性更高。本发明实施例通过深度大于地下连续墙的咬合式灌注桩，从而延伸了既有建筑物中单一的地下连续墙围护结构的***深度，从而保障地上结构的安全性以及对地下结构进行施工，以保障地下施工的基坑开挖和施工作业的安全性。其中地上结构与地下结构的分界面以地平面200为参考。本发明即适用于新开发的建筑物地下结构，也适用于既有建筑物的地下结构改造施工。在既有建筑物的地下结构改造施工中，对地下连续墙等单一的原始基坑围护结构的再利用，减小了对周边环境的扰动，实现了绿色环保循环使用的目的。The foundation pit enclosure structure system 100 of the embodiment of the present invention is a superimposed structure composed of an underground continuous wall 110, a compacted grouting layer 130 and an occluded cast-in-place pile 120. Its strength and stability are much greater than that of an underground continuous wall Wait for a single foundation pit envelope structure. The bite-type cast-in-place pile 120 provided by the embodiment of the present invention has the advantages of safety, reliability, stability, short construction period, low engineering cost and little influence of soil quality of the foundation pit. The present invention uses the combination of the underground continuous wall 110 and the occluded cast-in-place pile 120, that is, it effectively utilizes the advantages of both the large rigidity of the underground continuous wall and the quick construction of the occluded-in-situ pile 120, and has good earth retaining and stopping Water effect; at the same time, under the condition that the existing underground continuous wall 110 has insufficient insertion depth, it effectively controls the deformation of the foundation pit, reduces the cost of technical measures, and accelerates the progress of the project. In the embodiment of the present invention, the first reserved steel bar 141 of the second compression beam 140 is anchored into the underground continuous wall 110, which is compared with the method of connecting the foundation pit envelope structure with the to-be-formed structural plate by using diagonal rods in the prior art. It guarantees the continuity, overall stability and safety of the foundation pit envelope structure system under force transmission, and can effectively control the deformation of the foundation pit. In the embodiment of the present invention, the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120 is compacted and grouted through the compacted grouting layer 130 to ensure the reliability and stability of the foundation pit enclosure structure system. To avoid the deformation of the underground continuous wall 110 and the occluded cast-in-place pile 120 in the gap, and the compacted grouting layer 130 does not need to perform the drilling process between the underground continuous wall 110 and the occluded in-situ pile 120, which can overcome the high-pressure rotary jet The structure damage caused to the underground continuous wall and the cast-in-place pile when the pile is grouted, therefore, the stability of the present invention is higher. The embodiment of the present invention extends the insertion depth of a single underground continuous wall enclosure structure in an existing building through a bite-type cast-in-place pile with a depth greater than the underground continuous wall, thereby ensuring the safety of the above-ground structure and the construction of the underground structure. In order to ensure the safety of underground pit excavation and construction operations. The interface between the above-ground structure and the underground structure refers to the ground plane 200 as a reference. The invention is applicable to the newly developed underground structure of buildings and also to the reconstruction of underground structures of existing buildings. In the reconstruction of the underground structure of existing buildings, the reuse of the single original foundation pit envelope structure such as the underground continuous wall reduces the disturbance to the surrounding environment and achieves the purpose of green environmental protection recycling.
请参考图1、图7至图8，本发明实施例提供的基坑围护结构体系100，包括位于所述地下连续墙110之间的墙基结构板150，所述墙基结构板150至少包括B0层墙基结构板151和B1层墙基结构板152。所述地下连续墙110的顶部设置有第一压顶梁160，所述B0层墙基结构板151设置在所述第一压顶梁160上。Please refer to FIG. 1, FIG. 7 to FIG. 8, the foundation pit enclosure structure system 100 provided by an embodiment of the present invention includes a wall-based structural panel 150 located between the underground continuous walls 110, and the wall-based structural panel 150 at least It includes a B0 layer wall-based structural panel 151 and a B1 layer wall-based structural panel 152. The top of the underground continuous wall 110 is provided with a first depressing beam 160, and the B0 layer wall base structural plate 151 is provided on the first depressing beam 160.
请参考图1，本发明实施例提供的基坑围护结构体系100，包括位于所述咬 合式灌注桩120之间的桩基结构板170。所述桩基结构板170至少包括B2层桩基结构板171、B3层桩基结构板172和底层桩基结构板173。所述B2层桩基结构板171位于所述第二压顶梁140上，所述B2层桩基结构板171为所述第二压顶梁140对应层待形成的桩基结构板。所述B3层桩基结构板172和所述底层桩基结构板173均位于所述咬合式灌注桩120之间。本发明实施例的地下结构包括但不限于4层，包括由B0层墙基结构板151、B1层墙基结构板152和B2层桩基结构板171构成的2层墙基地下结构和由B2层桩基结构板171、B3层桩基结构板172和底层桩基结构板173构成的2层桩基地下结构。在新建工程或者既有建筑物改进过程中，可以根据具体需求有地理环境适当调整。Referring to FIG. 1, the foundation pit enclosure structure system 100 provided by an embodiment of the present invention includes a pile foundation structural plate 170 between the bite-type cast-in-place piles 120. The pile foundation structural plate 170 at least includes a B2 layer pile foundation structural plate 171, a B3 layer pile foundation structural plate 172, and a bottom pile foundation structural plate 173. The B2 layer pile foundation structural plate 171 is located on the second top beam 140. The B2 layer pile foundation structural plate 171 is a pile foundation structural plate to be formed in the corresponding layer of the second top beam 140. The B3 layer pile foundation structural plate 172 and the bottom pile foundation structural plate 173 are located between the occluded cast-in-place piles 120. The underground structure of the embodiment of the present invention includes, but is not limited to, 4 floors, including a 2-layer wall base structure consisting of a B0 layer wall base structural panel 151, a B1 layer wall base structural panel 152, and a B2 layer pile base structural panel 171, and a B2 substructure A two-layer pile base structure consisting of a layer pile foundation structural plate 171, a B3 layer pile foundation structural plate 172 and a bottom pile foundation structural plate 173. During the construction of new projects or the improvement of existing buildings, the geographical environment can be adjusted according to specific needs.
请参考图1，本发明实施例提供的基坑围护结构体系100，所述底层桩基结构板173下方设置有立柱桩180。所述墙基结构板150之间、桩基结构板170之间以及墙基结构板150与桩基结构板170之间平均分布有支撑柱190。立柱桩180用于保证地下结构的稳定性。支撑柱190用于保护各层结构板之间的稳定性。Referring to FIG. 1, a foundation pit envelope structure system 100 provided by an embodiment of the present invention, a column pile 180 is provided below the bottom pile foundation structural plate 173. Support columns 190 are evenly distributed between the wall-based structural panels 150, between the pile-based structural panels 170, and between the wall-based structural panels 150 and the pile-based structural panels 170. The column pile 180 is used to ensure the stability of the underground structure. The support column 190 is used to protect the stability between the structural plates of each layer.
请参考图4至图6，本发明实施例提供的基坑围护结构体系100，所述咬合式灌注桩120包括多根灌注桩，相邻两根灌注桩部分重合设置，从而形成咬合式灌注桩120。Please refer to FIG. 4 to FIG. 6, the foundation pit envelope structure system 100 provided by an embodiment of the present invention, the occluded cast-in-place pile 120 includes a plurality of cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped to form an occluded infusion Pile 120.
请参考图1-8，本发明实施例还提供一种基坑围护结构体系100的施工方法，包括以下步骤：Referring to FIGS. 1-8, an embodiment of the present invention also provides a construction method of a foundation pit enclosure structure system 100, including the following steps:
步骤1，在地下连续墙110的一侧施工咬合式灌注桩120，使所述咬合式灌注桩120的深度大于所述地下连续墙110的深度，并且使所述咬合式灌注桩120形成位于上部分的素混凝土灌注桩段121和位于下部分的钢筋混凝土灌注桩段122，所述钢筋混凝土灌注桩段122的长度大于素混凝土灌注桩段121；咬合式灌注桩120可以形成在地下连续墙110的内侧或者外侧，本发明实施例优选采用内侧，从而使形成的桩基结构板170相对于墙基结构板150为收紧结构，从而保证基坑围护结构体系和地下结构的稳固性。为了保证基坑的稳定性，弥补围护结构***深度的不足，在距离地下连续墙内侧300mm至400mm处施工咬合式灌注桩120，钻孔前采用内径比灌注桩桩径大100mm至200mm的钢护筒进行预埋。其中，请参考图5，素混凝土灌注桩段121为多根灌注桩，相邻两根灌注桩部分重合设置。请参考图6，钢筋混凝土灌注桩段122形成在相邻两个素混 凝土灌注桩段121之间，从而形成咬合式结构。其中钢筋混凝土灌注桩段122为混凝土1221和钢筋1222构成。请参考图4，素混凝土灌注桩段121和钢筋混凝土灌注桩段122通过分界线123划分。Step 1, construct an occluded cast-in-place pile 120 on one side of the underground continuous wall 110, so that the depth of the occluded cast-in-place pile 120 is greater than the depth of the underground continuous wall 110, and form the occluded in-situ pile 120 on the top Part of the plain concrete cast-in-place pile section 121 and the reinforced concrete cast-in-place pile section 122 at the lower part, the length of the reinforced concrete cast-in-place pile section 122 is longer than that of the plain concrete in-situ pile section 121; the occluded cast-in-place pile 120 may be formed in the underground continuous wall 110 The inner side or the outer side of the embodiment of the present invention preferably uses the inner side, so that the formed pile foundation structural panel 170 is a tightening structure relative to the wall-based structural panel 150, thereby ensuring the stability of the foundation pit enclosure structure system and the underground structure. In order to ensure the stability of the foundation pit and make up for the lack of insertion depth of the enclosure structure, the occluded cast-in-place pile 120 is constructed at a distance of 300 mm to 400 mm from the inside of the underground continuous wall. Before drilling, steel with an inner diameter larger than the pile diameter of 100 mm to 200 mm is used. The casing is pre-buried. Among them, please refer to FIG. 5, the plain concrete cast-in-place pile section 121 is a plurality of cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped. Referring to Fig. 6, reinforced concrete cast-in-place pile section 122 is formed between two adjacent plain concrete-filled pile sections 121, thereby forming an occlusal structure. The reinforced concrete cast-in-place pile section 122 is composed of concrete 1221 and steel bars 1222. Please refer to FIG. 4, the plain concrete cast-in-place pile section 121 and the reinforced concrete cast-in-place pile section 122 are divided by a dividing line 123.
步骤2，在地下连续墙110和咬合式灌注桩120之间的缝隙形成压密注浆层130。其目的是为了填充密实，以确保地下连续墙110和咬合式灌注桩120组合结构之间受力传递的连续性，充分发挥叠合式围护结构整体效应。Step 2: A compacted grouting layer 130 is formed in the gap between the underground continuous wall 110 and the occluded cast-in-place pile 120. The purpose is to fill and compact, to ensure the continuity of the force transmission between the combined structure of the underground continuous wall 110 and the occluded cast-in-place pile 120, and to give full play to the overall effect of the folded envelope structure.
步骤3，请参考图1至图4，去除所述咬合式灌注桩120中的素混凝土灌注桩段121，在咬合式灌注桩120的钢筋混凝土灌注桩段122的顶部施工第二压顶梁140，使第二压顶梁140的两端分别设置有第一预留钢筋141和第二预留钢筋142，通过第一预留钢筋141使第二压顶梁140与地下连续墙110锚入连接。例如第二预留钢筋为3×3Φ16@200，锚入地连墙并用HILTI RE-500型号的混凝土填充加固孔洞，使地下连续墙110和咬合式灌注桩120桩形成一个完整的联动体系。Step 3, please refer to FIG. 1 to FIG. 4, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is removed, and the second compression roof beam 140 is constructed on top of the reinforced concrete cast-in-place pile section 122 of the occluded in-situ pile 120. A first reserved steel bar 141 and a second reserved steel bar 142 are respectively provided at both ends of the second top beam 140, and the second top beam 140 is anchored to the underground continuous wall 110 through the first reserved bar 141. For example, the second reserved steel bar is 3×3Φ16@200, anchored into the ground connection wall and filled with HILTI RE-500 concrete to reinforce the holes, so that the underground continuous wall 110 and the occluded cast-in-place pile 120 pile form a complete linkage system.
作为较佳的实施方式，本发明实施例提供的基坑围护结构体系100的施工方法，还包括：As a preferred embodiment, the construction method of the foundation pit enclosure structure system 100 provided by the embodiment of the present invention further includes:
步骤4，请参考图4、图7至图8，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩120中的素混凝土灌注桩段121，在所述地下连续墙110之间施工墙基结构板150。具体施工步骤，可以在基坑开挖至B1层墙基结构板152以下1.5m左右时施工B0层墙基结构板151，通过B0层墙基结构板151来抵抗基坑围护结构体系传来的侧向压力；在第一压顶梁160上施工B0层墙基结构板151，以保证其稳定，控制地下连续墙110的顶部位移。Step 4, please refer to FIG. 4, FIG. 7 to FIG. 8, during the excavation of the foundation pit, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is gradually removed between the underground continuous walls 110 Construction wall base structure board 150. For the specific construction steps, the B0-layer wall base structural panel 151 can be constructed when the foundation pit is excavated to about 1.5m below the B1-layer wall base structural panel 152, and the B0 layer wall base structural panel 151 can be used to resist the foundation pit enclosure structure system. Lateral pressure; construct B0-layer wall base structural panel 151 on the first top beam 160 to ensure its stability and control the top displacement of the underground continuous wall 110.
步骤5，请参考图1至图3，在具有钢筋混凝土灌注桩段122的咬合式灌注桩120之间施工桩基结构板170；通过第二预留钢筋142使所述第二压顶梁140与其对应层形成的桩基结构板锚入连接。即第二压顶梁140通过第二预留钢筋142与B2层桩基结构板锚入连接。其目的是增加地下连续墙110、咬合式灌注桩120和压密注浆层130形成的基坑围护结构体系的稳固性。步骤4至步骤5的实施方式，适用于新建工程的基坑围护结构体系。Step 5, please refer to FIG. 1 to FIG. 3, the pile foundation structural plate 170 is constructed between the occluded cast-in-place piles 120 with reinforced concrete cast-in-place pile sections 122; The anchoring connection of the pile foundation structure plate formed by the corresponding layer. That is, the second top beam 140 is anchored and connected to the B2 layer pile foundation structural plate through the second reserved steel bar 142. The purpose is to increase the stability of the foundation pit enclosure structure system formed by the underground continuous wall 110, the occluded cast-in-place pile 120 and the compacted grouting layer 130. The implementation methods of steps 4 to 5 are applicable to the foundation pit envelope structure system of new construction.
作为较佳的实施方式，本发明实施例提供的基坑围护结构体系100的施工方法，还包括As a preferred embodiment, the construction method of the foundation pit enclosure structure system 100 provided by the embodiment of the present invention further includes
步骤4’，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩120中的素混凝土灌注桩段121；Step 4', during the excavation of the foundation pit, the plain concrete cast-in-place pile section 121 in the occluded cast-in-place pile 120 is gradually removed;
步骤5’，在具有钢筋混凝土灌注桩段122的咬合式灌注桩120之间施工桩基结构板170；通过第二预留钢筋142使所述第二压顶梁140与其对应层形成的桩基结构板锚入连接。即第二压顶梁140通过第二预留钢筋142与B2层桩基结构板锚入连接。其目的是增加地下连续墙110、咬合式灌注桩120和压密注浆层130形成的基坑围护结构体系的稳固性。此种步骤4至步骤5适用于新建工程的基坑围护结构体系。步骤4’和步骤5’的实施方式，适用于对既有建筑物地下结构改造工程。Step 5', a pile foundation structural panel 170 is constructed between the occluded cast-in-place piles 120 with reinforced concrete cast-in-place pile sections 122; the pile foundation structure formed by the second top beam 140 and its corresponding layer through the second reserved steel bar 142 Board anchor connection. That is, the second top beam 140 is anchored and connected to the B2 layer pile foundation structural plate through the second reserved steel bar 142. The purpose is to increase the stability of the foundation pit enclosure structure system formed by the underground continuous wall 110, the occluded cast-in-place pile 120 and the compacted grouting layer 130. Such steps 4 to 5 are applicable to the foundation pit enclosure structure system of new construction. The implementation of steps 4'and 5'is applicable to the reconstruction of the underground structure of existing buildings.
本发明实施例中，所述第二压顶梁140通过第一预留钢筋141与所述地下连续墙110锚入连接，所述第二压顶梁140通过第二预留钢筋142与其对应层待形成的桩基结构板锚入连接。通过与地下连续墙140的锚入连接以及待形成的桩基结构板锚入连接，从而增强了基坑围护结构体系的可靠性和稳定性。优先的第一预留钢筋141为三根，但不限于三根。In the embodiment of the present invention, the second top beam 140 is anchored and connected to the underground continuous wall 110 through the first reserved steel bar 141, and the second top beam 140 is to be formed on the corresponding layer through the second reserved steel bar 142 Anchoring connection of the pile foundation structural plate. Through the anchor connection with the underground continuous wall 140 and the anchor connection of the pile foundation structural plate to be formed, the reliability and stability of the foundation pit enclosure structure system are enhanced. The priority first reserved steel bar 141 is three, but not limited to three.
本发明实施例的基坑围护结构体系与地下结构“逆作法”施工相结合，无须设内支撑，便于机械化快速施工，不影响下一道工序的施工，节约工期，避免***拆撑等给环境带来的影响，实现了绿色施工。The foundation pit enclosure structure system of the embodiment of the present invention is combined with the "reverse construction" construction of the underground structure, without the need for internal support, which is convenient for mechanized and rapid construction, does not affect the construction of the next procedure, saves the construction period, and avoids blasting, disassembly, support, etc. to the environment The impact brought about by green construction.
本发明的核心是：采用地下连续墙、咬合式灌注桩以及压密注浆三者的叠合形式，结合土方开挖、地下结构的施工，形成一个叠合式围护结构与地下结构联合作用的体系。创造性地解决了在既有围护结构***深度不足情况下引起的基坑不稳定、变形大的问题以及工期紧张、造价高的问题，确保了基坑开挖过程中的安全性，有效的提高了施工效率、降低了工程成本、确保结构质量、实现绿色建造。The core of the present invention is to adopt a superimposed form of underground continuous wall, occluded cast-in-place pile and compacted grouting, combined with earthwork excavation and construction of underground structure, to form a combined effect of superimposed envelope structure and underground structure system. Creatively solved the problem of instability and large deformation of the foundation pit caused by the insufficient insertion depth of the existing enclosure structure, and the problems of tight construction period and high cost, ensuring the safety of the foundation pit during the excavation process and effectively improving To improve construction efficiency, reduce engineering costs, ensure structural quality, and achieve green construction.
本发明实施例为一种可解决在深、大基坑工程中既有围护结构***深度不足的叠合式围护结构，是将地下连续墙、咬合式灌注桩及压密注浆相结合，并通过分步开挖、分步施工结构层使整个围护结构形成一种完整的稳定体系，解决了在深、大基坑改造中的基坑稳定性不足、工期紧张等问题。The embodiment of the present invention is a superimposed envelope structure that can solve the insufficient insertion depth of the existing envelope structure in deep and large foundation pit projects. It is a combination of an underground continuous wall, occluded cast-in-place piles and compacted grouting. And through step-by-step excavation and step-by-step construction of the structural layer, the entire envelope structure is formed into a complete stable system, which solves the problems of insufficient stability and tight construction period in deep and large foundation pit reconstruction.
本发明实施例特别适用于利用原有地下连续墙的基坑改造工程，具有绿色环保、可利用、施工方便、受力明确可靠、节约造价的优点，对解决深、大基 坑改造工程中基坑稳定性不足、变形控制要求高、工期紧张，以及地下结构质量要求高等难题具有实用意义。The embodiment of the present invention is particularly suitable for the foundation pit reconstruction project using the original underground continuous wall, which has the advantages of green environmental protection, availability, convenient construction, clear and reliable stress, and cost saving. Problems such as insufficient stability of the pit, high requirements for deformation control, tight construction period, and high requirements for the quality of the underground structure have practical significance.
本发明不限于上述具体实施方式，凡在本发明的精神和范围内所作出的各种变化和润饰，均在本发明的保护范围之内。The present invention is not limited to the above specific embodiments, and all changes and modifications made within the spirit and scope of the present invention are within the protection scope of the present invention.

Claims (12)

  1. 一种基坑围护结构体系，其特征在于，包括地下连续墙，位于所述地下连续墙一侧的咬合式灌注桩，所述咬合式灌注桩的深度大于所述地下连续墙的深度，以及位于所述地下连续墙和咬合式灌注桩之间缝隙内的压密注浆层；所述咬合式灌注桩的顶部设置有第二压顶梁，所述第二压顶梁的两端分别设置有第一预留钢筋和第二预留钢筋，所述第二压顶梁通过第一预留钢筋与所述地下连续墙锚入连接，所述第二压顶梁通过第二预留钢筋与其对应层待形成的桩基结构板锚入连接。A foundation pit enclosure structure system, characterized by comprising an underground continuous wall, an occluded cast-in-place pile located on one side of the underground continuous wall, the depth of the occluded cast-in-place pile is greater than the depth of the underground continuous wall, and A compacted grouting layer located in the gap between the underground continuous wall and the occluded cast-in-place pile; the top of the occluded in-situ pile is provided with a second pressure top beam, and the two ends of the second pressure top beam are respectively provided with A reserved steel bar and a second reserved steel bar, the second pressing roof beam is anchored to the underground continuous wall through the first reserved steel bar, and the second pressing roof beam is to be formed through the second reserved steel bar and its corresponding layer Anchoring connection of the pile foundation structural plate.
  2. 如权利要求1所述的基坑围护结构体系，其特征在于，包括位于所述地下连续墙之间的墙基结构板。The foundation pit enclosing structure system according to claim 1, characterized in that it includes a wall-based structural panel between the underground continuous walls.
  3. 如权利要求2所述的基坑围护结构体系，其特征在于，所述墙基结构板至少包括B0层墙基结构板和B1层墙基结构板。The foundation pit enclosure structure system according to claim 2, wherein the wall-based structural panel includes at least a B0-layer wall-based structural panel and a B1-layer wall-based structural panel.
  4. 如权利要求3所述的基坑围护结构体系，其特征在于，所述地下连续墙的顶部设置有第一压顶梁，所述B0层墙基结构板设置在所述第一压顶梁上。The foundation pit envelope structure system of claim 3, wherein the top of the underground continuous wall is provided with a first pressing roof beam, and the B0 layer wall base structural plate is provided on the first pressing roof beam.
  5. 如权利要求1所述的基坑围护结构体系，其特征在于，包括位于所述咬合式灌注桩之间的桩基结构板。The foundation pit envelope structure system according to claim 1, characterized in that it includes a pile foundation structural plate located between the bite-type cast-in-place piles.
  6. 如权利要求5所述的基坑围护结构体系，其特征在于，所述桩基结构板至少包括B2层桩基结构板、B3层桩基结构板和底层桩基结构板。The foundation pit envelope structure system according to claim 5, wherein the pile foundation structural plate includes at least a B2 layer pile foundation structural plate, a B3 layer pile foundation structural plate and a bottom pile foundation structural plate.
  7. 如权利要求6所述的基坑围护结构体系，其特征在于，所述B2层桩基结构板位于所述第二压顶梁上，所述B2层桩基结构板为所述第二压顶梁对应层待形成的桩基结构板。The foundation pit envelope structure system according to claim 6, wherein the B2 layer pile foundation structural plate is located on the second top beam, and the B2 layer pile foundation structural plate is the second top beam The pile foundation structural plate to be formed at the corresponding layer.
  8. 如权利要求6所述的基坑围护结构体系，其特征在于，所述底层桩基结构板下方设置有立柱桩。The foundation pit envelope structure system according to claim 6, wherein a column pile is provided below the bottom pile foundation structural plate.
  9. 如权利要求1所述的基坑围护结构体系，其特征在于，所述咬合式灌注桩包括多根灌注桩，相邻两根灌注桩部分重合设置。The foundation pit envelope structure system of claim 1, wherein the bite-type cast-in-place piles include multiple cast-in-place piles, and two adjacent cast-in-place piles are partially overlapped.
  10. 一种基坑围护结构体系的施工方法，其特征在于，A construction method of foundation pit enclosure structure system, characterized in that
    在地下连续墙的一侧施工咬合式灌注桩，使所述咬合式灌注桩的深度大于 所述地下连续墙的深度，并且使所述咬合式灌注桩形成位于上部分的素混凝土灌注桩段和位于下部分的钢筋混凝土灌注桩段，所述钢筋混凝土灌注桩段的长度大于素混凝土灌注桩段；Construct an occluded cast-in-place pile on one side of the underground continuous wall so that the depth of the occluded cast-in-place pile is greater than the depth of the underground continuous wall, and form the occluded cast-in-place pile into a plain concrete cast-in-place pile section at the upper part and A reinforced concrete cast-in-place pile section located at the lower part, the reinforced concrete cast-in-place pile section is longer than the plain concrete cast-in-place pile section;
    在地下连续墙和咬合式灌注桩之间的缝隙形成压密注浆层；Forming a compacted grouting layer between the gap between the underground continuous wall and the occluded cast-in-place pile;
    去除所述咬合式灌注桩中的素混凝土灌注桩段，在咬合式灌注桩的钢筋混凝土灌注桩段的顶部施工第二压顶梁，使第二压顶梁的两端分别设置有第一预留钢筋和第二预留钢筋，通过第一预留钢筋使第二压顶梁与地下连续墙锚入连接。Remove the plain concrete cast-in-place pile section of the bite-in-place cast-in-place pile, and construct a second crushing top beam on top of the reinforced concrete cast-in-place pile section of the occluded cast-in-place pile, so that both ends of the second crushing beam are provided with first reserved steel bars respectively And the second reserved steel bar, and the second pressure top beam is anchored to the underground continuous wall through the first reserved steel bar.
  11. 如权利要求10所述的基坑围护结构体系的施工方法，其特征在于，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩中的素混凝土灌注桩段，在所述地下连续墙之间施工墙基结构板；The construction method of the foundation pit envelope structure system according to claim 10, characterized in that during the excavation of the foundation pit, the plain concrete cast-in-place pile section in the bite-in-place cast-in-place pile is gradually removed, and the underground Construction of wall base structural panels between continuous walls;
    在具有钢筋混凝土灌注桩段的咬合式灌注桩之间施工桩基结构板；Construction of pile foundation structural plates between occluded cast-in-place piles with reinforced concrete cast-in-place pile sections;
    通过第二预留钢筋使所述第二压顶梁与其对应层形成的桩基结构板锚入连接。The second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
  12. 如权利要求10所述的基坑围护结构体系的施工方法，其特征在于，在基坑开挖施工过程中，逐步去除所述咬合式灌注桩中的素混凝土灌注桩段；The construction method of the foundation pit envelope structure system according to claim 10, characterized in that during the excavation of the foundation pit, the plain concrete cast-in-place pile section of the bite-in-place cast-in-place pile is gradually removed;
    在具有钢筋混凝土灌注桩段的咬合式灌注桩之间施工桩基结构板；Construction of pile foundation structural plates between occluded cast-in-place piles with reinforced concrete cast-in-place pile sections;
    通过第二预留钢筋使所述第二压顶梁与其对应层形成的桩基结构板锚入连接。The second pre-reinforcing steel bar is used to anchor and connect the pile foundation structural plate formed by the second top beam and its corresponding layer.
PCT/CN2019/092630 2018-11-12 2019-06-25 Foundation pit retaining structure system and construction method therefor WO2020140405A1 (en)

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