A kind of inclined brace front construction structure and construction method thereof

Abstract

The present invention discloses a pre-construction structure of a diagonal brace, comprising: foundation pit support piles, the foundation pit support piles are HU piles, the HU piles are composed of a support structure and a combined structure, the support structure is an "H"-shaped structure, the combined structure is a sawtooth "U"-shaped structure, the "H"-shaped structure and the sawtooth "U"-shaped structure are connected to each other; diagonal brace lattice columns, the diagonal brace lattice columns are connected to the foundation pit support piles; supporting piles, the supporting piles are used to support the bottom of the diagonal brace lattice columns, and the supporting piles are connected to the diagonal brace lattice columns. The present invention improves the stability of the diagonal brace structure, reduces the construction difficulty, improves the construction efficiency, and ensures the safety of the foundation pit through a special diagonal brace construction method.

Description

Technical Field

[0001] The invention relates to the field of basement foundation pit support in construction engineering, and in particular to a front-placed inclined support construction structure and a construction method thereof. Background Art

[0002] In engineering construction, the development and utilization of underground space is the focus of research, so the retaining design and construction technology of foundation pit engineering are also constantly developing. In the design of foundation pit support, it is necessary to consider the form of retaining structure by comprehensively considering factors such as surrounding environment, soil conditions, foundation pit excavation depth, structural safety, project cost, construction convenience and construction period. As a form of foundation pit support, the inclined brace is more flexible in layout than the general internal support structure, can save a large number of components, facilitate earth excavation, save construction period, has obvious economic benefits, and is widely used in foundation pit support engineering.

[0003] Referring to the "A kind of inclined brace steel support and a construction method of the inclined brace steel support" mentioned in Chinese publication number CN110424406A, the disclosure adopts the method of burying the inclined brace steel support underground to improve the construction efficiency to a certain extent, but this method cannot guarantee the stability of the structure during construction, and there is still room for improvement in construction efficiency. Summary of the invention

[0004] In order to solve the problems of high construction cost, long construction period, unstable structure and low construction efficiency of the existing inclined brace construction technology, a inclined brace front construction structure and a construction method thereof are proposed. The present invention improves the stability of the inclined brace structure and improves the construction efficiency.

[0005] In order to achieve the above object, the present invention proposes the following technical solutions:

[0006] A front-mounted inclined brace construction structure, comprising:

[0007] Foundation pit support piles, the foundation pit support piles are HU piles, the HU piles are composed of a support structure and a combined structure, the support structure is an "H"-shaped structure, the combined structure is a sawtooth "U"-shaped structure, and the "H"-shaped structure and the sawtooth "U"-shaped structure are connected to each other;

[0008] An oblique braced lattice column, wherein the oblique braced lattice column is connected to the foundation pit support pile;

[0009] Support piles, the support piles are used to support the bottom of the oblique brace lattice column, and the support piles are connected to the oblique brace lattice column;

[0010] The present invention adopts foundation pit supporting piles and oblique support lattice columns as main construction components. The foundation pit supporting piles adopt a special HU pile structure to ensure structural stability, and support columns are adopted to ensure that the oblique support lattice column structure has sufficient stability.

[0011] Preferably, the diagonal braced lattice column includes vertical supports and transverse supports, wherein the vertical supports are composed of four angle steels, and the transverse supports are composed of a plurality of steel tie plates, wherein the transverse supports are perpendicular to the vertical supports, and the transverse supports are connected to the vertical supports. The present invention ensures the stability of the diagonal braced lattice column through a multi-directional support structure, thereby enhancing the stability of the overall structure.

[0012] Preferably, a top beam is provided at the top of the diagonal brace lattice column, the top beam is connected to the top of the diagonal brace lattice column, and the top beam is connected to the foundation pit supporting piles. The present invention makes the connection between the diagonal brace lattice column and the foundation pit supporting piles more stable through the top beam, thereby ensuring the firmness of the structure.

[0013] Preferably, the construction structure includes a steel cage, which is composed of grid-like steel bars. The present invention uses a grid-like steel cage to facilitate the injection of filling materials during construction, and the structure uses low material consumption, which can save costs.

[0014] Preferably, the steel cage is a trapezoidal structure, and the short bottom side of the trapezoidal structure is close to the foundation pit supporting piles. The present invention uses a special structure of the steel cage to enable the supporting piles to form the same structure, thereby ensuring the structural stability after construction.

[0015] Preferably, the diagonal brace lattice column and the steel cage are provided with connecting components, and the connecting components are steel plates with reserved holes, and the connecting components are fixedly connected to the diagonal brace lattice column and the steel cage. The present invention ensures that the diagonal brace lattice column and the steel cage can be connected and fixed while also being able to rotate, thereby ensuring the operability of the construction structure.

[0016] Preferably, the support column is made of concrete. The present invention uses concrete as the support structure. The concrete can be liquefied when the temperature is sufficient, which is convenient for injection, and then cooled to become a solid to complete the overall support. The pile length of the small continuous wall of concrete bored piles can be flexibly controlled according to the geological conditions of the underlying stratum. The bottom of the pile passes through the soft stratum and enters the stable stratum, providing a stable foundation for the fulcrum of the foundation pit support structure.

[0017] A construction method of a diagonal brace pre-construction structure, using the above-mentioned diagonal brace pre-construction structure, comprises the following steps:

[0018] S1: First construct foundation pit support piles, and prefabricate lattice columns and steel cages;

[0019] S2: Support pile hole construction, the steel cage is lowered to the hole mouth;

[0020] S3: Connect the lattice column and the steel cage, and lower the lattice column and the steel cage to the bottom;

[0021] S4: insert the conduit and pour concrete into the steel cage;

[0022] S5: digging a trench along the position between the supporting pile and the top beam;

[0023] S6: rotating the lattice column with the connecting member as the rotation center so that the top end of the lattice column is placed at the top beam position;

[0024] S7: The top beam construction is completed, the foundation pit is excavated, and the bottom plate is poured;

[0025] The construction method of the present invention completes the construction of foundation pit support piles before foundation pit excavation, and the foundation pit is excavated once to avoid leaving construction gaps on the bottom plate during secondary excavation, which causes bottom plate leakage. In addition, there is no need to leave soil at the pit edge, which reduces the additional load of excavating at the pit edge and improves excavation efficiency.

[0026] Therefore, the present invention has the following advantages:

[0027] 1. The present invention adopts foundation pit supporting piles and oblique support lattice columns as main construction components. The foundation pit supporting piles adopt a special HU pile structure to ensure structural stability, and support columns are used to ensure that the oblique support lattice column structure has sufficient stability.

[0028] 2. Use concrete as the supporting structure. Concrete can be liquefied when the temperature is sufficient, which is convenient for injection, and then cooled to become solid to complete the overall support. The pile length of the small continuous wall of concrete bored piles can be flexibly controlled according to the geological conditions of the underlying stratum. The bottom of the pile passes through the soft stratum and enters the stable stratum, providing a stable foundation for the fulcrum of the foundation pit support structure.

[0029] 3. The construction method of the present invention completes the construction of the foundation pit support piles before excavating the foundation pit. The foundation pit is excavated once to avoid leaving construction gaps on the bottom plate during secondary excavation, which causes bottom plate leakage. There is no need to leave soil at the pit edge, which reduces the additional load of excavating at the pit edge and improves excavation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of the method of the present invention;

[0031] Figure 2 This is the plan layout diagram of this embodiment;

[0032] Figure 3 This is the structural diagram of this embodiment

[0033] Figure 4 Diagram of the steps for installing the steel cage;

[0034] Figure 5 This is a diagram of the steps for connecting the steel cage and the lattice column;

[0035] Figure 6 The diagram is a step-by-step diagram for lowering the reinforcement cage and lattice columns;

[0036] Figure 7 This is a diagram of the steps for pouring concrete behind the lower pipe;

[0037] Figure 8 A diagram showing the steps for installing the inclined lattice columns after trench excavation;

[0038] Fig. 9 This is a step diagram for excavating the foundation pit and pouring the bottom slab after pressing the top beam;

[0039] Among them, there are foundation pit supporting piles 1, inclined support lattice columns 2, steel cages 3, connecting parts 4, top beams 5, and supporting piles 6. DETAILED DESCRIPTION

[0040] In order to explain the technical content of the present invention in detail, further description is given below in combination with the implementation modes and the accompanying drawings.

[0041] Please refer to Figure 2 and Figure 3The foundation pit support piles of this embodiment adopt HU piles composed of HN700X300X13X24 steel and IV Larsen steel sheet piles as the supporting structure and the combined structure, wherein the HN700X300X13X24 steel is an "H"-shaped structure, the IV Larsen steel sheet piles are a sawtooth "U"-shaped structure, and the HN700X300X13X24 steel and the IV Larsen steel sheet piles are connected to each other. A top beam is provided on the top of the foundation pit support piles, and the top beam is composed of 6 800mm bored piles, and the top beam is used to connect with the lattice column after installation. This embodiment adopts the diagonal bracing lattice column and the foundation pit support piles as the main construction components. The foundation pit support piles adopt a special HU pile structure to ensure structural stability while reducing costs, and a steel cage is provided to ensure the support of the diagonal bracing lattice column. The diagonal brace lattice column includes vertical supports and transverse supports. The vertical supports are composed of four metal columns, and the transverse supports are composed of several metal columns. The transverse supports are perpendicular to the vertical supports to form a grid shape. This embodiment is composed of four angle steels and steel tie plates. This embodiment ensures the stability of the overall structure through a multi-directional support structure. The steel cage is composed of grid-shaped steel bars, which is characterized by less material and light weight, and it is convenient to inject concrete during construction to achieve a coordinated support effect. The diagonal brace lattice column and the steel cage are provided with connecting parts. The connecting parts are steel plates with reserved holes. The connecting parts are fixedly connected to the diagonal brace lattice column and the steel cage. This embodiment ensures that the diagonal brace lattice column and the steel cage can be connected and fixed while also being able to rotate through the connecting parts to ensure that the construction process can proceed. The outside of the steel cage is covered with a support structure, and the support structure is concrete. The present invention uses concrete as the support structure. The concrete can be liquefied when the temperature is sufficient, which is convenient for injection, and then cooled to become a solid to complete the overall support. The pile length of the small continuous wall of concrete bored piles can be flexibly controlled according to the geological conditions of the underlying stratum. The bottom of the pile passes through the soft stratum and enters the stable stratum, providing a stable foundation for the fulcrum of the foundation pit support structure.

[0042] Please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The construction method adopted in this embodiment includes the following steps:

[0043] S1: First construct foundation pit support piles, and prefabricate lattice columns and steel cages;

[0044] S2: Support pile hole construction, the steel cage is lowered to the hole mouth;

[0045] S3: Connect the lattice column and the steel cage, and lower the lattice column and the steel cage to the bottom;

[0046] S4: insert the conduit and pour concrete into the steel cage;

[0047] S5: digging a trench along the position between the supporting pile and the top beam;

[0048] S6: rotating the lattice column with the connecting member as the rotation center so that the top end of the lattice column is placed at the top beam position;

[0049] S7: The top beam construction is completed, the foundation pit is excavated, and the bottom plate is poured.

[0050] Through the above steps, this embodiment can flexibly control the length of the top beam at the end of the foundation pit support pile according to the geological conditions of the base stratum, pass through the soft stratum into the stable stratum, and provide stable support for the foundation pit support structure. Because the foundation pit support piles in this embodiment and implementation method have been completed before the foundation pit is excavated, the foundation pit can be excavated once, and there is no need to excavate the bottom plate twice to cause the appearance of construction joints, which will affect the waterproof and anti-seepage ability of the bottom plate. In addition, there is no need to leave soil at the edge of the pit, which reduces the additional load of excavating the pit edge, improves the excavation efficiency, shortens the construction period, and reduces costs.

[0051] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention.

Claims

1. A construction method for a front-mounted inclined brace construction structure, comprising the following steps: S1: First construct the foundation pit support piles, and prefabricate the lattice columns and steel cages; S2: Support pile hole construction, steel cage lowered to the hole mouth; S3: Connect the lattice column and the steel cage, and lower the lattice column and the steel cage to the bottom; S4: lower the conduit and pour concrete into the steel cage; S5: Dig a trench along the position between the supporting piles and the top beam; S6: Rotate the lattice column with the connection part as the rotation center so that the top end of the lattice column is placed at the top beam position; S7: The top beam construction is completed, the foundation pit is excavated, and the bottom slab is poured; The inclined brace front construction structure comprises: Pit support piles, which are HU piles. HU piles are composed of a supporting structure and a combined structure. The supporting structure is an "H"-shaped structure, and the combined structure is a sawtooth "U"-shaped structure. The "H"-shaped structure and the sawtooth "U"-shaped structure are connected to each other. The oblique braced lattice columns are connected with the foundation pit support piles; Support piles, which are used to support the bottom of the diagonal bracing lattice columns, and are connected to the diagonal bracing lattice columns; A top beam is provided on the top of the oblique braced lattice column, which is composed of six bored piles; The oblique bracing lattice column and the steel cage are provided with a connecting component, which is a steel plate with a reserved hole. The lattice column is rotated with the connecting component as the rotation center so that the top of the lattice column is placed at the top beam position; It also includes a steel cage, which is composed of grid-like steel bars and has a trapezoidal structure.

2. The construction method of the front-mounted inclined brace structure according to claim 1 is characterized in that: The diagonal braced lattice column comprises a vertical support member and a transverse support member, wherein the vertical support member is composed of four angle steels, and the transverse support member is composed of a plurality of steel tie plates. The transverse support member is perpendicular to the vertical support member and is connected to the vertical support member.

3. The construction method of the front-mounted inclined brace construction structure according to claim 1 is characterized in that: The top beam is connected to the top end of the oblique bracing lattice column, and the top beam is connected to the foundation pit support piles.

4. The construction method of the front-mounted inclined brace structure according to claim 1 is characterized in that: The short bottom side of the trapezoidal structure is close to the foundation pit supporting piles.

5. The construction method of the front-mounted inclined brace structure according to claim 1 is characterized in that: The connecting component is fixedly connected to the diagonal bracing lattice column and the steel cage.

6. The construction method of the front-mounted inclined brace construction structure according to claim 1 is characterized in that: The supporting column is made of concrete.

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