House building weak deep foundation pit supporting structure

Abstract

The utility model discloses a house building weak deep foundation pit supporting structure which comprises a plurality of supporting piles which are distributed on the side line of a deep foundation pit at intervals and partially inserted into the ground from the bottom of the deep foundation pit. The supporting beams correspond to the supporting piles one to one, the supporting beams are tightly attached to the side wall of the deep foundation pit, one ends of the supporting beams are connected with the top ends of the supporting piles, and the other ends of the supporting beams are fixed to the side wall of the deep foundation pit through fixing pieces; the plurality of shotcrete-anchor supporting components are arranged corresponding to the plurality of supporting beams one by one, each shotcrete-anchor supporting component is inserted into the underground, the rear end part of each shotcrete-anchor supporting component is fixed with the corresponding supporting beam, and each shotcrete-anchor supporting component comprises a shotcrete-anchor cylinder and a plurality of material spraying holes formed in the shotcrete-anchor cylinder. The strength and rigidity of the supporting structure are improved, and the problems that soil around the weak deep foundation pit is prone to deformation, and the supporting structure is prone to being unstable are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft deep foundation pit support. More specifically, the utility model relates to a support structure for a soft deep foundation pit in building construction. Background Art

[0002] With the rapid development of urbanization construction, the construction of deep foundation pits in building construction is becoming more and more frequent. Foundation pit support is a measure of retaining, strengthening and protecting the side wall of the foundation pit and its surrounding area to ensure the safety of the underground structure construction of the foundation pit or its surrounding area. Soft foundation pits are prone to deformation and the slope soil is prone to displacement. In case of heavy rainstorm attack, foundation pit collapse accidents are likely to occur.

[0003] For example, the patent with the application number 202322391136.7 discloses a support structure for a soft soil foundation deep foundation pit. Through the sliding connection between the support groove and the connecting plate, the connecting plate is driven to move, the height of the connecting plate is adjusted, and then different foundation pits are supported to improve the practicability. Through the clearance fit between the fixing rod and the fixing hole, the connecting plate is fixed. At the same time, through the fitting between the fixing groove and the placing plate, the connecting plate is supported to improve the stability of the connecting plate. Although it can support foundation pits of different heights, its support strength and stiffness are insufficient, and there is a problem that the surrounding soil of the soft deep foundation pit is prone to deformation and the support structure is prone to instability. Summary of the Invention

[0004] An object of the utility model is to solve at least the above problems and / or defects and provide at least the advantages described hereinafter.

[0005] The object of the utility model is to provide a support structure for a soft deep foundation pit in building construction, which improves the strength and stiffness of the support structure for the problem that the surrounding soil of the soft deep foundation pit in the prior art is prone to deformation and the support structure is prone to instability.

[0006] To achieve the object and other advantages according to the utility model, there is provided a support structure for a soft deep foundation pit in building construction, including:

[0007] Multiple support piles, which are distributed at intervals along the edge line of the deep foundation pit, and multiple support piles are partially inserted into the ground from the bottom of the deep foundation pit;

[0008] Multiple support beams, which are arranged corresponding to multiple support piles one by one, multiple support beams are closely arranged along the side wall of the deep foundation pit, one end of the support beam is connected to the top end of the support pile, and the other end is fixed on the side wall of the deep foundation pit through a fixing member;

[0009] Multiple shotcrete-anchorage support members, which are arranged corresponding to multiple support beams one by one. After each shotcrete-anchorage support member is inserted into the ground, its end is fixed to the corresponding support beam. Each shotcrete-anchorage support member includes a shotcrete-anchorage cylinder and multiple spraying holes arranged on the shotcrete-anchorage cylinder.

[0010] Preferably, the soft and deep foundation pit support structure for building construction further includes:

[0011] A steel mesh, which is laid on the soil between multiple support beams on the side wall of the deep foundation pit.

[0012] Preferably, the soft and deep foundation pit support structure for building construction further includes:

[0013] A water-stop curtain, which is arranged outside multiple support piles and is set along the edge line of the deep foundation pit. The upper end of the water-stop curtain is fixedly connected to multiple support beams, and the lower end is inserted into the ground.

[0014] Preferably, the soft and deep foundation pit support structure for building construction further includes:

[0015] Reinforcing seats, which are arranged around the pit mouth of the deep foundation pit. The reinforcing seats are connected to multiple support beams, and a catch water channel is arranged on the reinforcing seats; the bottom of the reinforcing seats is fixed by fixing members.

[0016] Preferably, the soft and deep foundation pit support structure for building construction further includes:

[0017] Multiple corner reinforcing bars, which are arranged at the corners where multiple support beams are connected to the reinforcing seats, and the multiple corner reinforcing bars are arranged in a cross shape.

[0018] Preferably, the catch water channel is communicated with a sump outside the deep foundation pit through a water extraction pipe.

[0019] Preferably, the depth of the water-stop curtain inserted into the ground is greater than the depth of the support piles inserted into the ground.

[0020] The utility model has at least the following beneficial effects:

[0021] First, the soft and deep foundation pit support structure for building construction of the utility model supports the whole support structure by arranging multiple support piles and multiple support beams along the edge line of the deep foundation pit. By arranging multiple shotcrete and anchor support members obliquely downward, when concrete is poured into the shotcrete barrel, part of the concrete is sprayed into the soft geological area around the deep foundation pit through multiple spraying holes, forming a solid and stable structure with the soft geology, improving the strength and stiffness of the support structure, and effectively avoiding the problem of soil deformation around the soft and deep foundation pit and unstable support.

[0022] Second, the soft and deep foundation pit support structure for building construction of the utility model prevents the loose and soft geological soil from collapsing during the construction of the deep foundation pit by arranging a steel mesh on the soil between multiple support beams.

[0023] Thirdly, the soft and deep foundation pit support structure for building construction of the present utility model sets a water-stop curtain along the outer side of multiple support piles along the edge line of the deep foundation pit to prevent the water in the soft geology under the deep foundation pit from flowing into the deep foundation pit and affecting the construction.

[0024] Fourthly, the soft and deep foundation pit support structure for building construction of the present utility model sets a strengthening seat around the pit mouth of the deep foundation pit, which can not only enhance the connection between multiple support beams and the top surface of the deep foundation pit, but also strengthen the support of the top surface of the deep foundation pit to prevent the soft geology from being washed into the deep foundation pit by rainwater. By setting a catch water channel on the strengthening seat, it can be used for the temporary storage of rainwater or surface water, and can be used for construction or pumped out of the support structure.

[0025] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the soft and deep foundation pit support structure for building construction according to an embodiment of the present utility model;

[0027] Figure 2 is a partial structural schematic diagram of the soft and deep foundation pit support structure for building construction according to an embodiment of the present utility model;

[0028] Reference numerals: 1: deep foundation pit, 2: support pile, 3: support beam, 4: shotcrete and anchor support member, 400: shotcrete and anchor barrel, 410: shotcrete hole, 420: drill bit, 5: steel mesh, 6: water-stop curtain, 7: strengthening seat, 700: catch water channel, 8: corner reinforcement. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The following further describes the present utility model in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0030] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0031] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0032] It should be noted that, unless otherwise specified, the control methods in the following technical solutions are all conventional methods, and the equipment structures, unless otherwise specified, can all be obtained through commercial channels.

[0033] For example Figures 1-2 , the present utility model provides a supporting structure for a soft and deep foundation pit in building construction, including:

[0034] Multiple support piles 2, which are distributed at intervals along the side line of the deep foundation pit 1, and multiple support piles 2 are partially inserted into the ground from the bottom of the deep foundation pit 1;

[0035] Multiple support beams 3, which are arranged corresponding to multiple support piles 2 one by one, multiple support beams 3 are arranged closely against the side wall of the deep foundation pit 1, one end of the support beam 1 is connected to the top end of the support pile 2, and the other end is fixed on the side wall of the deep foundation pit 1 through a fixing member;

[0036] Multiple shotcrete and anchor support members 4, which are arranged corresponding to multiple support beams 3 one by one, after each shotcrete and anchor support member 4 is inserted into the ground, the end part thereof is fixed to the corresponding support beam 3, and each shotcrete and anchor support member 4 includes a shotcrete and anchor barrel 400 and a plurality of spray holes 410 arranged on the shotcrete and anchor barrel 400.

[0037] Among them, the support piles 2 are constructed first, measured and positioned at the set position through a total station, drilled, the steel reinforcement cage is sunk, and concrete is filled to form. The diameter of each support pile 2 is 400 mm, the spacing between multiple support piles is 4 meters, the depth of each support pile 2 inserted under the deep foundation pit 1 is 0.4 times the depth of the deep foundation pit 1, and the length of the support pile 2 is not less than 2 times the depth of the deep foundation pit. The support beam 3 has the same structure as the support pile 2, and both are reinforced concrete structures. The diameter of each support beam 3 is 400 mm. The support beam 3 is formed by pre-construction, and its length is determined according to the support pile 2, equal to the distance from the top end of the support pile 2 to the top surface of the deep foundation pit 1. Each support beam 3 is fixed through a fixing member (anchoring the steel bars between the two through steel bar anchoring) to form a bent anchor. An installation groove matching the end part (the non-inserted end into the ground) of the shotcrete and anchor support member 4 is arranged on each support beam 3. Concrete is injected into each shotcrete and anchor barrel 400. After the shotcrete and anchor barrel 400 is filled, the end part is inserted into the corresponding installation groove, and the gap position is reinforced by filling concrete.

[0038] In the above technical solution, by arranging a plurality of retaining piles 2 and a plurality of support beams 3 along the side line of the deep foundation pit 1, the plurality of retaining piles 2 support and block the soft geology around the deep foundation pit 1. The main support of the side line of the deep foundation pit 1 is formed by the plurality of support beams 3 and the plurality of retaining piles 2. By arranging a plurality of shotcrete and anchor support members 4 on the support beams 3, when pouring concrete into the shotcrete tube 400, part of the concrete is sprayed into the soft geology around the deep foundation pit 1 from the plurality of spraying holes 410, forming a solid and stable structure with the soft geology, improving the strength and stiffness of the support structure, and effectively avoiding the problem of soil deformation around the soft deep foundation pit and unstable support.

[0039] In another technical solution, the building soft deep foundation pit support structure further includes:

[0040] A steel mesh 5, which is laid on the soil between the plurality of support beams 3 on the side wall of the deep foundation pit 1.

[0041] Among them, the thickness of the steel mesh 5 is 8 mm.

[0042] In the above technical solution, by arranging the steel mesh 5 on the soil between the plurality of support beams 3, it prevents the loose and soft geological soil from collapsing during the construction of the deep foundation pit 1. In addition, in order to further strengthen the support strength, a concrete surface layer is also arranged between the soil and the steel mesh 5. The strength grade of the concrete surface layer is not lower than C20, and the thickness is 60 mm.

[0043] In another technical solution, the building soft deep foundation pit support structure further includes:

[0044] A water stop curtain 6, which is arranged outside the plurality of retaining piles 2 and is arranged along the side line of the deep foundation pit 1. The upper end of the water stop curtain 6 is fixedly connected to the plurality of support beams 3, and the lower end is inserted into the ground.

[0045] Among them, the water stop curtain 6 is constructed after the retaining piles 2. It uses ordinary portland cement, the water-cement ratio is 1.5, and the cement admixture amount is 85 kg per meter. In order to ensure the support strength and stiffness, its unconfined compressive strength at 28 days is not less than 0.8 MPa, and a three-axis mixer is used for construction, with a skip-type double-hole full-set re-mixing construction process.

[0046] In the above technical solution, by arranging the water stop curtain 6 along the side line of the deep foundation pit 1 outside the plurality of retaining piles 2, it blocks the water in the soft geology under the deep foundation pit 1 from flowing into the deep foundation pit and affecting the construction. In addition, it further enhances the strength and stiffness of the support structure and ensures the safety of the support.

[0047] In another technical solution, the building soft deep foundation pit support structure further includes:

[0048] Reinforcement seat 7 is provided around the opening of the deep foundation pit 1. The reinforcement seat 7 is connected to multiple support beams 3, and a catch ditch 700 is provided on the reinforcement seat 7. The bottom of the reinforcement seat 7 is fixed by fixing components.

[0049] Among them, the reinforcement seat 7 is of reinforced concrete structure. The reinforcement seat 7 and multiple support beams 3 are connected by steel bar anchoring between them. The bottom of the reinforcement seat 7 can be reinforced by inserting anchor piles into the ground. The depth of the catch ditch 700 can be designed according to needs and is not limited here.

[0050] In the above technical solution, by setting the reinforcement seat 7 around the opening of the deep foundation pit 1, not only can the connection between multiple support beams 3 and the top surface of the deep foundation pit 1 be enhanced, but also the top surface of the deep foundation pit 1 can be strengthened for support, avoiding the soft geology being washed into the deep foundation pit 1 by rainwater scouring. By setting a catch ditch on the reinforcement seat 7, it can be used for temporary storage of rainwater or surface water, and can be used for construction or pumped out of the support structure.

[0051] In another technical solution, the building soft deep foundation pit support structure further includes:

[0052] Multiple corner reinforcement bars 8 are provided at the corners of the connection between multiple support beams 3 and the reinforcement seat 7, and the multiple corner reinforcement bars 8 are arranged in a cross shape.

[0053] Among them, the corner reinforcement bars 8 are formed by intersecting steel bars. During construction, at the connection with the support beam 3, when the support beam 3 is being processed and not yet solidified, they are inserted. After the support beam 3 solidifies, the two are integrated. For the other end, when the reinforcement seat 7 is being constructed, they are inserted into the corresponding positions before the reinforcement seat 7 solidifies to achieve the setting and connection.

[0054] In the above technical solution, by setting multiple corner reinforcement bars 8 between multiple support beams 3 and the reinforcement seat 7, the strength and stiffness of the support structure are further enhanced, avoiding the problem of unstable support caused by the offset of the soil around the soft deep foundation pit.

[0055] In another technical solution, the catch ditch 700 is connected to a catch basin outside the deep foundation pit 1 through a drain pipe, which is used to timely discharge the water collected in the support structure to avoid it overflowing and flowing into the deep foundation pit 1 along the surface of the reinforcement seat 7.

[0056] In another technical solution, the depth of the cut-off curtain 6 inserted into the ground is greater than the depth of the retaining piles 2 inserted into the ground, which has a better water-blocking effect, prevents the water in the soft geology from flowing into the deep foundation pit and affecting the construction, and ensures the safety of the support.

[0057] Although the technical solution of the present utility model has been disclosed as above, it is not limited to the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the illustrated examples described herein.

Claims

1. The supporting structure for a soft and deep foundation pit in building construction is characterized in that Including: Multiple retaining piles, which are spaced along the side line of the deep foundation pit, and multiple retaining piles are partially inserted into the ground from the bottom of the deep foundation pit; Multiple support beams, which are arranged corresponding to multiple retaining piles one by one, multiple support beams are arranged closely along the side wall of the deep foundation pit, one end of the support beam is connected to the top end of the retaining pile, and the other end is fixed on the side wall of the deep foundation pit through a fixing member; Multiple shotcrete and anchor support members, which are arranged corresponding to multiple support beams one by one, and the end of each shotcrete and anchor support member is fixed to the corresponding support beam after being inserted into the ground. Each shotcrete and anchor support member includes a shotcrete and anchor barrel and multiple spraying holes arranged on the shotcrete and anchor barrel.

2. The building foundation soft deep foundation pit support structure according to claim 1, characterized in that, It further includes: A steel mesh, which is laid on the soil between multiple support beams on the side wall of the deep foundation pit.

3. The building foundation soft deep foundation pit support structure according to claim 1, characterized in that, It further includes: A water-stop curtain, which is arranged outside multiple retaining piles and is arranged along the side line of the deep foundation pit. The upper end of the water-stop curtain is fixedly connected to multiple support beams, and the lower end is inserted into the ground.

4. The building foundation pit supporting structure for soft and deep foundation pits as described in claim 1, characterized in that, It further includes: A strengthening seat, which is arranged around the opening of the deep foundation pit. The strengthening seat is connected to multiple support beams, and a drainage ditch is arranged on the strengthening seat; the bottom of the strengthening seat is fixed through a fixing member.

5. The building foundation soft deep foundation pit support structure according to claim 4, characterized in that, It further includes: Multiple corner strengthening ribs, which are arranged at the corners of the joints between multiple support beams and the strengthening seat, and multiple corner strengthening ribs are arranged in a cross shape.

6. The building foundation pit supporting structure for soft and deep foundation pits as claimed in claim 4, wherein, The drainage ditch is communicated with a sump outside the deep foundation pit through a water extraction pipe.

7. The building foundation soft deep foundation pit support structure according to claim 3, characterized in that, The depth of the water-stop curtain inserted into the ground is greater than the depth of the retaining pile inserted into the ground.

Images