Combined foundation pit supporting structure

Abstract

The utility model discloses a combined type foundation pit supporting structure, which belongs to the technical field of foundation pit supporting and comprises a plurality of first cast-in-place pile structures, and the plurality of first cast-in-place pile structures are arranged between a foundation pit bottom and an underground layer side by side. According to the combined type foundation pit supporting structure, the first top beam and the first cast-in-place pile structure are connected through the waist beam and the cast-in-place pile connecting piece in a steel bar planting mode, gaps between the piles and the concrete waist beam are filled with plain concrete of the same type as the waist beam, and the connecting face is increased; the two sides of the concrete waist beam are locked within a certain width range through the prestressed anchor rod structures to serve as supports of the concrete waist beam, so that the concrete waist beam and the first cast-in-place pile structures are connected into a whole, deformation of the foundation pit can be effectively controlled through the overall coordination effect of the concrete waist beam, the safety and deformation requirements of the foundation pit can be met, and the construction cost is reduced. And supporting systems which influence the construction period and the construction cost, such as supports, can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of foundation pit support, concretely is a combined foundation pit support structure. BACKGROUND

[0002] The building structure is more and more sufficient for the space utilization in the red line range, and the surrounding environment is increasingly complex, and the local foundation pit is adjacent to the existing underground building structure, which seriously limits the implementation conditions of anchor rod. The traditional pile anchor support form cannot meet the engineering needs.

[0003] If the internal support is used, the deformation of the foundation pit can be effectively controlled, but the construction of the internal support has a great influence on the construction period and cost of the foundation pit project, and the removal and support replacement of the later support and other working conditions will also cause the construction difficulty of the main structure to increase, the construction period to be prolonged, and the cost to increase, etc. How to better solve the above problems has become the primary task at the present stage.

[0004] The commonly used solutions at the present stage are two kinds: one is to use double-row pile support form: this support form must occupy a large space, and the engineering quantity of the support pile is obviously increased, thereby leading to the increase of cost, and the support depth of double-row pile is limited and generally does not exceed 10m, which must be determined in combination with the stratum condition. Two, use internal support: this support form can effectively control the deformation of the foundation pit, but the construction of the internal support will have a great influence on the construction period and cost of the foundation pit project, and the removal and support replacement of the later support and other working conditions will also cause the construction difficulty of the main structure to increase, the construction period to be prolonged, and the cost to increase.

[0005] In view of the above problems, a new type of bored pile + concrete waist beam combined support structure is put forward, which can not only ensure the deformation of the foundation pit to a certain extent, but also reduce the construction process and construction cost, and also ensure safety. Whether from the technical, economic, construction period or safety, the above problems can be better solved. CONTENT OF THE UTILITY MODEL

[0006] (I) Technical problem solved

[0007] In order to overcome the above defects of the prior art, the utility model provides a combined foundation pit support structure, which solves the problems that the double-row pile support form occupies a large space, the engineering quantity of the support pile is obviously increased, the cost is increased, and the support depth of double-row pile is limited and generally does not exceed 10m, which must be determined in combination with the stratum condition, and although the internal support form can effectively control the deformation of the foundation pit, the construction of the internal support will have a great influence on the construction period and cost of the foundation pit project, and the removal and support replacement of the later support and other working conditions will also cause the construction difficulty of the main structure to increase, the construction period to be prolonged, and the cost to increase.

[0008] (II) Technical scheme

[0009] To achieve the above object, the utility model provides the following technical scheme: a combined foundation pit support structure, including first cast -in -place pile structure, the number of first cast -in -place pile structure is multiple, multiple first cast -in -place pile structure is side by side between the foundation pit bottom and the underground layer and is arranged, and the gap between multiple first cast -in -place pile structure is all provided with pile filling, and one side of multiple first cast -in -place pile structure is provided with two concrete waist beams, and the sticking position of concrete waist beam and part first cast -in -place pile structure is all connected together through multiple waist beam and cast -in -place pile connecting piece, the concrete waist beam still is connected together with the underground layer through multiple waist beam and underground layer reinforcing piece.

[0010] As a further scheme of the utility model: part waist beam and cast -in -place pile connecting piece are from part pile filling and extend to first cast -in -place pile structure.

[0011] As a further scheme of the utility model: the waist beam and cast -in -place pile connecting piece are connecting reinforcing steel bars.

[0012] As a further scheme of the utility model: the waist beam and underground layer reinforcing piece are from part pile filling and extend to the underground layer.

[0013] As a further scheme of the utility model: the waist beam and underground layer reinforcing piece are prestressed anchor rod structures.

[0014] As a further scheme of the utility model: the top of multiple first cast -in -place pile structure is fixedly installed with same first crown beam.

[0015] As a further scheme of the utility model: multiple waist beam and underground layer reinforcing piece of each column longitudinal still are provided with same second cast -in -place pile structure, and the second cast -in -place pile structure is arranged in the underground layer, and two second crown beams are arranged above the underground layer, and the second crown beam is fixedly connected with multiple second cast -in -place pile structure below.

[0016] (Three) beneficial effects

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1、 the combined foundation pit support structure, through the waist beam and cast -in -place pile connecting piece adopt the mode of planting the reinforcing steel bar and connect first crown beam and first cast -in -place pile structure, and the gap between pile and concrete waist beam is filled with the plain concrete of same model with waist beam, increases the connecting surface, secondly, the prestressed anchor rod structure locking in the width range of both sides of concrete waist beam is used as the support of concrete waist beam, makes concrete waist beam and first cast -in -place pile structure connect into an organic whole, through the overall coordination of concrete waist beam, can effectively control the deformation of foundation pit, can satisfy the safety and deformation demand of foundation pit, can also avoid the support system of influencing construction period and cost such as support.

[0019] 2、The combined foundation pit support structure, by increasing the second cast-in-place pile structure in the underground layer, the waist beam and the underground layer reinforcing member can be connected through the second cast-in-place pile structure, and then extended into the underground layer, so that the waist beam of each column and the underground layer are connected, and the second cast-in-place pile structure is connected through the second crown beam, and an integrated ground anchor structure can be formed, so that the coordination force between the concrete waist beam and the first cast-in-place pile structure can be greatly improved, the deformation of the foundation pit is further prevented, and safe construction operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0021] Figure 2 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0022] Figure 3 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom. Figure 2 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0023] Figure 4 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0024] Figure 5 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0025] Figure 6 The first cast-in-place pile structure of the utility model is a structure schematic view of construction in the underground layer and the foundation pit bottom.

[0026] In the drawing: 1, underground layer; 2, foundation pit bottom; 3, first cast-in-place pile structure; 4, concrete waist beam; 5, first crown beam; 6, waist beam and cast-in-place pile connecting piece; 7, waist beam and underground layer reinforcing member; 8, second crown beam; 9, pile filling; 10, second cast-in-place pile structure. DETAILED DESCRIPTION

[0027] The technical scheme of the patent will be further described in detail in combination with specific embodiments.

[0028] Example 1

[0029] As Figures 1-6As shown, the utility model provides a technical scheme: a combined foundation pit support structure, including first cast -in -place pile structure 3, the quantity of first cast -in -place pile structure 3 is multiple, the top fixed mounting of multiple first cast -in -place pile structure 3 has same first crown beam 5, first crown beam 5 can be connected together by first cast -in -place pile structure 3, play good reinforcing effect, multiple first cast -in -place pile structure 3 between and side set between foundation pit bottom 2 and underground layer 1, and multiple first cast -in -place pile structure 3 The gap between is all provided with pile filling 9, and the pile filling 9 fills and compacts concrete waist beam 4 and first cast -in -place pile structure 3, and good pile filling 9 is best with the concrete waist beam 4 Same concrete best, by filling dense room can increase the connecting surface, increase the coordination between structures, and can realize the function of force sharing, reduce the risk of foundation pit deformation, one side of multiple first cast -in -place pile structure 3 is provided with two concrete waist beams 4, and the sticking position of concrete waist beam 4 and part first cast -in -place pile structure 3 is all connected together through multiple waist beam and cast -in -place pile connecting piece 6, part waist beam and cast -in -place pile connecting piece 6 from part pile filling 9, and extend to first cast -in -place pile structure 3, waist beam and cast -in -place pile connecting piece 6 are connected reinforcement, and the connecting reinforcement can be integrated structure with concrete waist beam 4 and first cast -in -place pile structure 3, increase the connecting point, keep the connection firmness, and the connecting reinforcement is not easy to break, concrete waist beam 4 is also connected together with underground layer 1 through multiple waist beam and underground layer reinforcing member 7, and waist beam and underground layer reinforcing member 7 from part pile filling 9, and extend to underground layer 1, and waist beam and underground layer reinforcing member 7 are pre -stressed anchor rod structure, and extend to a certain length on both sides of concrete waist beam 4, and adopt pre -stressed anchor rod structure locking, make both sides of concrete waist beam 4 stable fixed, this mode makes concrete waist beam 4 can utilize the stiffness of itself and play the deformation coordination effect.

[0030] In the embodiment: first crown beam 5 and first cast -in -place pile structure 3 are connected by the way of planting reinforcement of waist beam and cast -in -place pile connecting piece 6, and the gap between pile and concrete waist beam 4 is filled with plain concrete of the same model with waist beam, increase the connecting surface, secondly, the support of concrete waist beam 4 is locked by pre -stressed anchor rod structure within a certain width range on both sides of concrete waist beam 4, make concrete waist beam 4 and first cast -in -place pile structure 3 into an integral whole, through the overall coordination effect of concrete waist beam 4, can effectively control the deformation of foundation pit, can meet the safety and deformation demand of foundation pit, and can avoid the support system of influencing construction period and cost.

[0031] Embodiment 2

[0032] As Figure 6As shown, the plurality of waist beams of each column is arranged in the same second cast-in-place pile structure 10 with the underground layer reinforcing member 7, the second cast-in-place pile structure 10 can connect the longitudinally arranged waist beams and the underground layer reinforcing member 7 together, thereby effectively improving the coordination force and the anti-deformation effect of the foundation pit, and also improving the stable support of the foundation pit, the second cast-in-place pile structure 10 is arranged in the underground layer 1, and two second crown beams 8 are arranged above the underground layer 1, and the second crown beams 8 are fixedly connected with the corresponding plurality of second cast-in-place pile structures 10 below.

[0033] In the embodiment, by increasing the second cast-in-place pile structure 10 in the underground layer 1, the waist beam and the underground layer reinforcing member 7 can be arranged out of the second cast-in-place pile structure 10 and then extended into the underground layer 1, so that the waist beam of each column is connected with the underground layer 1, and the plurality of second cast-in-place pile structures 10 are also connected through the second crown beams 8 to form an integrated anchor structure, thereby greatly improving the coordination force between the concrete waist beam 4 and the first cast-in-place pile structure 3, further preventing the deformation of the foundation pit, and ensuring the safe construction work.

[0034] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The above describes the preferred embodiment of the present application in detail, but the present application is not limited to the above-mentioned embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A combined foundation pit support structure comprising a first cast-in-place pile structure (3), characterized in that: The quantity of the first cast-in-place pile structure (3) is multiple, multiple first cast-in-place pile structures (3) are arranged side by side between the foundation pit bottom (2) and the underground layer (1), and the gaps between the multiple first cast-in-place pile structures (3) are all provided with pile filling (9), one side of the multiple first cast-in-place pile structures (3) is provided with two concrete waist beams (4), and the abutting positions of the concrete waist beams (4) and part of the first cast-in-place pile structures (3) are all connected together through multiple waist beam and cast-in-place pile connecting pieces (6), and the concrete waist beams (4) are also connected together with the underground layer (1) through multiple waist beam and underground layer reinforcing pieces (7).

2. A combined foundation pit support structure according to claim 1, characterized in that: Part of the waist beam and cast-in-place pile connecting pieces (6) pass out from part of the pile filling (9) and extend into the first cast-in-place pile structure (3).

3. The combined foundation pit support structure according to claim 1, characterized in that: The waist beam and cast-in-place pile connecting piece (6) is a connecting steel bar.

4. The combined foundation pit support structure according to claim 1, characterized in that: The waist beam and underground layer reinforcing piece (7) passes out from part of the pile filling (9) and extends into the underground layer (1).

5. The combined foundation pit support structure according to claim 1, characterized in that: The waist beam and underground layer reinforcing piece (7) is a prestressed anchor rod structure.

6. The combined foundation pit support structure according to claim 1, wherein: Multiple first cast-in-place pile structures (3) are provided with the same first crown beam (5) on the top.

7. The combined foundation pit support structure according to claim 1, wherein: Multiple waist beam and underground layer reinforcing pieces (7) in each column of longitudinal direction also pass through the same second cast-in-place pile structure (10), and the second cast-in-place pile structure (10) is arranged in the underground layer (1), two second crown beams (8) are arranged above the underground layer (1), and the second crown beam (8) is fixedly connected with the multiple second cast-in-place pile structures (10) below.

Images