CN217128242U

CN217128242U - Deep foundation pit prefabricated enclosure structure for low-temperature environment construction

Info

Publication number: CN217128242U
Application number: CN202220457161.3U
Authority: CN
Inventors: 张敏; 沈曦; 计春杰; 徐丹; 施淑文
Original assignee: HUAYU CONSTRUCTION GROUP CO Ltd
Current assignee: HUAYU CONSTRUCTION GROUP CO Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-08-05
Anticipated expiration: 2032-03-04

Abstract

The utility model relates to a deep basal pit encloses technical field, concretely relates to prefabricated envelope of deep basal pit for low temperature environment construction, connect Larsen steel sheet pile and many prefabricated steel core concrete columns that form continuous sheet pile wall body including many mutual interlocks, adjacent the U type groove orientation of Larsen steel sheet pile is opposite, the orientation in the pile plate wall body outside be provided with in the U type groove prefabricated steel core concrete column, prefabricated steel core concrete column with Larsen steel sheet pile fixed connection. On the basis that a plurality of Larsen steel sheet piles are connected to form a continuous sheet pile wall, the prefabricated steel pipe concrete columns are added, the firmness of the sheet pile wall is improved, and therefore the supporting effect of the enclosure structure on the peripheral wall of the foundation pit is improved.

Description

Deep foundation pit prefabricated enclosure structure for low-temperature environment construction

Technical Field

The utility model relates to a deep basal pit enclosure technical field, concretely relates to prefabricated envelope of deep basal pit for low temperature environment construction.

Background

The development of cities drives the rapid development of underground spaces, the development and the utilization of underground spaces such as underground garages, subway tunnels, underground shopping malls and the like are accelerated, and the project quantity of deep foundation pit projects is increased. An effective foundation pit supporting form is one of measures for guaranteeing the smooth completion of foundation pit engineering. At present, four main types of deep foundation pit supporting modes are mainly adopted in China: slope releasing, gravity type cement soil walls, soil nailing walls and supporting and retaining structures; the first three support modes are gradually eliminated in most economically developed cities, and the retaining structure becomes a main foundation pit support mode. The supporting and blocking type structure comprises four common structural forms of a steel sheet pile form, an SMW construction method pile, a drilling and pouring pile and an underground continuous wall; the underground continuous wall has the advantages of high wall rigidity, good integrity, small deformation, water retaining and seepage resisting performance and the like, but the cost is relatively high, and in severe cold areas, the technology is not used generally because the construction cost in winter such as slurry preparation, excavation and grooving, reinforcement cage hoisting, concrete transportation and pouring and the like is too high; the cast-in-situ bored pile is simple and convenient to construct, does not need large machinery, occupies less land, has less environmental pollution and lower construction cost, but when constructed in severe cold areas, a warm shed needs to be built to preserve heat of construction machines, a mud pit, building materials, concrete maintenance and the like, the construction cost is high, the working environment is poor, and the construction quality is uneven; the steel sheet piles and the piles in the SMW construction method are prefabricated in factories, can be directly installed on site, are simple and quick to construct, and cannot be influenced by a severe cold environment, so that the steel sheet piles and the piles in the SMW construction method are usually selected to be used for enclosing a foundation pit in the severe cold environment.

The foundation pit steel sheet pile supporting structure disclosed in the Chinese patent with the application number of 202021556676.6 comprises a plurality of Larsen steel sheet piles connected in an occluded mode, wherein the Larsen steel sheet piles are connected to form at least four-surface foundation pit enclosing surfaces, each prefabricated concrete supporting beams are fixedly connected to the upper portions of the outer sides of the foundation pit enclosing surfaces, and the prefabricated concrete supporting beams are adjacent to each other and fixedly connected through cast-in-place concrete supporting beams. This patent is through connecting precast concrete supporting beam on the outside upper portion of the foundation ditch enclosure face that the larsen steel sheet pile formed to through a cast in situ concrete supporting beam fixed connection between two adjacent precast concrete supporting beams, each precast concrete supporting beam and cast in situ concrete supporting beam form integral type structure, thereby form stable and firm support to the larsen steel sheet pile in the outside of larsen steel sheet pile, prevent to topple, improve the excavation supporting security. This patent relies on precast concrete supporting beam to improve the fastness on the basis of using the steel sheet pile as enclosure major structure, can be applicable to among the microthermal construction environment, nevertheless if in deep basal pit, then for the steel sheet pile length in upper and lower direction is longer, if only rely on precast concrete supporting beam to consolidate in the steel sheet pile upper end, then general to the reinforcing effect of steel sheet pile whole speaking.

SUMMERY OF THE UTILITY MODEL

The utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a prefabricated envelope of deep basal pit for low temperature environment construction is provided, connect Larsen steel sheet pile and many prefabricated steel core concrete columns that form continuous sheet pile wall body including many mutual interlocks, adjacent the U type groove orientation of Larsen steel sheet pile is opposite, the orientation the pile board wall body outside be provided with in the U type groove prefabricated steel core concrete column, prefabricated steel core concrete column with Larsen steel sheet pile fixed connection.

As the utility model discloses a preferred, prefabricated steel core concrete column upper end be fixed with be used for with sheet pile wall body fixed connection's first connecting seat.

As the utility model discloses a preferred, first connecting seat with larsen steel sheet pile welded connection.

As the utility model discloses a preferred, the orientation the sheet pile wall body is inboard be fixed with the second connecting plate in the U type groove, both ends fixedly connected with stretches out about first connecting seat the first connecting plate of second connecting plate top, first connecting plate with second connecting plate fixed connection.

As the utility model discloses a preferred, first connecting plate from last down paste and lean on the second connecting plate, and first connecting plate with the second connecting plate is through wearing to establish the bolt detachable and connecting.

As the utility model discloses a preferably, every three is continuous Larsen steel sheet pile encloses into one and is located the inboard idle cavity of sheet pile wall body, be close to on the first connecting plate one side fixedly connected with breakwater of sheet pile wall body inboard, the breakwater with first connecting plate shelters from along vertical direction the last export of idle cavity.

As the utility model discloses a preferred, the breakwater is the slope form that inboard edge is higher than the outside edge.

As the utility model discloses a preferably, still include fixing device, fixing device is including being used for fixing at subaerial base and pull rod assembly, be formed with two at least joint grooves of following up end down extension in the prefabricated steel core concrete column, pull rod assembly has and extends down and can insert the joint pole in the joint groove.

As the optimization of the utility model, the horizontal cross section of the clamping groove is long circle.

As the utility model discloses a preferred, draw bar assembly includes the screw rod, installs nut slider and fixed connection on the screw rod the pull rod of nut slider, the joint pole is fixed the terminal below of pull rod.

Has the advantages that:

on the basis that a plurality of Larsen steel sheet piles are connected to form a continuous sheet pile wall, the prefabricated steel pipe concrete columns are added, the firmness of the sheet pile wall is improved, and therefore the supporting effect of the enclosure structure on the peripheral wall of the foundation pit is improved.

Drawings

FIG. 1 is a schematic view of a sheet pile wall formed by connecting the prefabricated concrete-filled steel tube column and a Larsen steel sheet pile;

FIG. 2 is a schematic view of a Larsen steel sheet pile with a second connecting plate;

FIG. 3 is a schematic view of a first connector, a first connector plate, and a second connector plate;

FIG. 4 is a schematic view of a fixture;

in the figure: 1. larsen steel sheet pile, 11, U type groove, 2, prefabricated steel core concrete column, 21, joint groove, 3, first connecting seat, 4, second connecting plate, 5, first connecting plate, 6, breakwater, 7, idle cavity, 8, base, 9, pull rod subassembly, 91, screw rod, 92, nut slider, 03, pull rod.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

The utility model relates to a prefabricated envelope of deep basal pit for low temperature environment construction, a serial communication port, connect Larsen steel sheet pile 1 and many prefabricated steel core concrete columns 2 that form continuous sheet pile wall body including many mutual interlocks, Larsen steel sheet pile 1 same specification, so when carrying out the interlock through the hook of side and connect and form continuous sheet pile wall body, need Larsen steel sheet pile 1 forward, one backward, carry out the cross connection, as shown in the figure, the event is adjacent Larsen steel sheet pile 1's U type groove 11 orientation is opposite, makes like this the sheet pile wall body wholly is the wave. When the sheet pile wall is arranged in a deep foundation pit to enclose the peripheral wall of the foundation pit, one side of the sheet pile wall facing the peripheral wall of the foundation pit is an inner side, one side of the sheet pile wall facing away from the peripheral wall of the foundation pit is an outer side, and a U-shaped groove 11 in the sheet pile wall facing away from the peripheral wall of the foundation pit is a usable space recessed towards the inner side, so that the prefabricated steel pipe concrete column 2 is arranged in the U-shaped groove 11 facing the outer side of the pile plate wall, and the prefabricated steel pipe concrete column 2 is fixedly connected with the Larsen steel plate pile 1. Therefore, on the basis that a plurality of Larsen steel sheet piles 1 are connected to form a continuous sheet pile wall, the prefabricated steel pipe concrete columns 2 are added, the firmness of the sheet pile wall is improved, and the supporting effect of the enclosure structure on the peripheral wall of the foundation pit is improved. Larsen steel sheet pile 1 with prefabricated steel core concrete column 2 all is the mill prefabrication, directly installs at the scene, does not need cast in situ concrete, so is applicable to the low temperature environment, and simple to operate. The prefabricated concrete-filled steel tube column 2 is provided with a steel tube shell, so that the prefabricated concrete-filled steel tube column and the Larsen steel plate pile 1 can be fixedly connected by welding directly. Of course, in actual construction, after the prefabricated concrete-filled steel tube column 2 is placed in the U-shaped groove 11 of the larsen steel sheet pile 1, a large distance may exist between a steel tube shell of the prefabricated concrete-filled steel tube column 2 and a groove wall of the U-shaped groove 11, and direct welding is not facilitated, so preferably, the first connecting seat 3 for being fixedly connected with the sheet pile wall body is fixed at the upper end of the prefabricated concrete-filled steel tube column 2, and the outer edge of the first connecting seat 3 is close to the larsen steel sheet pile 1 body, so that direct welding is facilitated. The prefabricated concrete-filled steel tube column comprises a steel tube shell, so that the first connecting seat can be directly welded on the steel tube shell. The fixed connection between the first connecting seat 3 and the larsen steel sheet pile 1 is not limited to welding, clamping connection can be selected, and the like, in short, the distance between the first connecting seat 3 and the larsen steel sheet pile 1 is small, the fixed connection is convenient to implement, and welding is preferred in the embodiment.

In further improvement, preferably, the direction of the inner side of the sheet pile wall body is fixed with a second connecting plate 4 in the U-shaped groove 11, the left end and the right end of the first connecting seat 3 are fixedly connected with a first connecting plate 5 extending out of the position above the second connecting plate 4, and the first connecting plate 5 is fixedly connected with the second connecting plate 4. The second connecting plate and the Larsen steel sheet pile are preferably connected in a welding mode, and the first connecting plate and the first connecting seat are also preferably connected in a welding mode. The Larsen steel sheet piles 1 forming the sheet pile wall body are divided into two types according to the orientation of the U-shaped grooves 11, one type is the Larsen steel sheet pile 1 with the U-shaped grooves 11 facing towards the inner side, the other type is the Larsen steel sheet pile 1 with the U-shaped grooves 11 facing towards the outer side, the prefabricated steel pipe concrete columns 2 are arranged in the U-shaped grooves 11 of the Larsen steel sheet piles 1 with the U-shaped grooves 11 facing towards the outer side, and the U-shaped grooves 11 of the Larsen steel sheet piles 1 with the U-shaped grooves 11 facing towards the inner side are not filled with filler, so that the Larsen steel sheet piles 1 with the U-shaped grooves 11 facing towards the inner side can obtain supporting force from the U-shaped grooves 11 to two sides, and the structural strength of the Larsen steel sheet pile 1 is improved. And first connecting plate 5 stretches out to second connecting plate 4 top and with second connecting plate 4 fixed connection from first connecting seat 3, prefabricated steel core concrete column 2 not only with the Larsen steel sheet pile 1 fixed connection who surrounds with self like this, but with three continuous Larsen steel sheet pile 1 fixed connection simultaneously, improved the joint strength between prefabricated steel core concrete column 2 and the sheet pile wall body, also make prefabricated steel core concrete column 2 more showing to the supporting role of sheet pile wall body simultaneously. Further, preferably first connecting plate 5 from last down paste and lean on second connecting plate 4, and first connecting plate 5 with second connecting plate 4 is through wearing to establish bolt detachable and connecting, compares with the welding, through bolted connection convenient and fast more, more practices thrift the cost, can realize Larsen steel sheet pile 1, the reuse of prefabricated steel core concrete column 2 moreover.

Every three continuous Larsen steel sheet piles 1 enclose to form a vacant cavity located on the inner side of the wall body of the sheet pile, the vacant cavity comprises a U-shaped groove 11 of the Larsen steel sheet pile 1 and a spacing space between the Larsen steel sheet piles 1 with the left U-shaped groove 11 and the right U-shaped groove 11 facing outwards, the space is always empty, rainwater can fall into the vacant space in rainy days, and then rainwater permeates into the peripheral wall of the foundation pit, so that the soil body becomes soft and is easy to collapse towards the inside of the foundation pit, the enclosure structure is not beneficial to enclosing the peripheral wall of the foundation pit, and therefore rainwater is prevented from entering the vacant space. The upper ends of the Larsen steel sheet piles 1 with the U-shaped grooves 11 facing the inner side are provided with the second connecting plates 4, rainwater is blocked, and the space between the Larsen steel sheet piles 1 with the two adjacent U-shaped grooves 11 facing the outer side is not blocked, so that the water baffle 6 is fixedly connected to one side, close to the inner side of the wall body of the sheet pile, of the first connecting plate 5, the water baffle 6 and the first connecting plate 5 block an upper outlet of the idle cavity in the vertical direction, so that falling rainwater can be blocked and cannot enter the idle cavity, soil body softening caused by rainwater permeating into the peripheral wall of the foundation pit is avoided, and a good supporting effect of the enclosure structure on the peripheral wall of the foundation pit is ensured. In a further improvement, the water baffle 6 is preferably in an inclined shape with the inner side edge higher than the outer side edge, so that rainwater can flow towards the direction far away from the peripheral wall of the foundation pit, and a drainage effect is achieved.

Larsen steel sheet pile 1 with prefabricated steel core concrete column 2 all inserts in the ground at the bottom of the foundation ditch through the lower extreme, the existence of prefabricated steel core concrete column 2 has improved the fastness of the sheet pile wall body that Larsen steel sheet pile 1 connects and forms again. In order to further improve the reinforcing effect of prefabricated steel core concrete column 2 to the sheet pile wall body, the preferred fixing device that still includes of this embodiment, fixing device is including being used for fixing base 8 and pull rod assembly 9 subaerial, be formed with at least two joint grooves 21 that extend down from the up end in prefabricated steel core concrete column 2, pull rod assembly 9 has down to extend and can insert the joint pole in the joint groove 21. The ground is the upper surface of the soil body at the periphery of the foundation pit. Prefabricated steel core concrete column 2 is the mill prefabrication, including steel pipe shell and the concrete of packing in steel pipe shell, will form joint groove 21, need pour into the water under high pressure in order to split into the concrete at the assigned position before the concrete initial set in steel pipe shell, and then form joint groove 21 from the up end down extension in the concrete, after concrete in the steel pipe shell condenses completely, just has been retained joint groove 21. After the installation of prefabricated steel core concrete column 2 was accomplished, just accomplish the installation of pull rod assembly 9 in inserting joint groove 21 through the joint pole alignment, base 8 is fixed subaerial, and pull rod assembly 9 installs on base 8, and fixing device just pulls the upper end of living prefabricated steel core concrete column 2 like this, further reduces the trend that prefabricated steel core concrete column 2 emptys towards the foundation ditch to improve the reinforcing effect of prefabricated steel core concrete column 2 to the sheet pile wall body. Further improve, preferably the horizontal cross section of joint groove 21 is long circular, can be convenient for insert of joint pole like this, avoids appearing because of the existence of precision error and leads to the unable condition of aiming at inserting joint groove 21 of joint pole.

In a further improvement, preferably, the pull rod assembly 9 includes a screw 91, a nut slider 92 mounted on the screw 91, and a pull rod 93 fixedly connected to the nut slider 92, and the clamping rod is fixed below the tail end of the pull rod 93. Therefore, the nut slider 92 can move along the screw rod 91 by rotating the screw rod 91, so that the pulling force of the pull rod 93 to the prefabricated concrete-filled steel tube column 2 is adjusted to adapt to different construction environments.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a prefabricated envelope of deep basal pit for low temperature environment construction, its characterized in that, includes many interlock connection and forms Larsen steel sheet pile (1) and many prefabricated steel core concrete columns (2) of continuous sheet pile wall body, and is adjacent U type groove (11) orientation of Larsen steel sheet pile (1) is opposite, the orientation in the sheet pile wall body outside be provided with in U type groove (11) prefabricated steel core concrete column (2), prefabricated steel core concrete column (2) with Larsen steel sheet pile (1) fixed connection.

2. The deep foundation pit prefabricated building envelope for low-temperature environment construction according to claim 1, characterized in that a first connecting seat (3) for fixedly connecting with the sheet pile wall is fixed at the upper end of the prefabricated steel pipe concrete column (2).

3. The deep foundation pit prefabricated building envelope for low-temperature environment construction according to claim 2, characterized in that the first connecting seat (3) is welded with the Larsen steel sheet pile (1).

4. The deep foundation pit prefabricated building enclosure for low-temperature environment construction according to claim 2, wherein a second connecting plate (4) is fixed in the U-shaped groove (11) facing the inner side of the sheet pile wall, a first connecting plate (5) extending above the second connecting plate (4) is fixedly connected to the left end and the right end of the first connecting seat (3), and the first connecting plate (5) is fixedly connected with the second connecting plate (4).

5. A deep foundation pit prefabricated building envelope for construction in low temperature environment according to claim 4, characterized in that the first connecting plate (5) is attached to the second connecting plate (4) from top to bottom, and the first connecting plate (5) and the second connecting plate (4) are detachably connected by penetrating bolts.

6. The deep foundation pit prefabricated building enclosure for low-temperature environment construction according to claim 5, wherein every three consecutive Larsen steel sheet piles (1) enclose a free cavity (7) located inside the sheet pile wall, a water baffle (6) is fixedly connected to one side of the first connecting plate (5) close to the inside of the sheet pile wall, and the water baffle (6) and the first connecting plate (5) block an upper outlet of the free cavity (7) in a vertical direction.

7. The deep foundation pit prefabricated building envelope for construction in low temperature environment as claimed in claim 6, wherein the water baffle (6) is inclined with its inner edge higher than its outer edge.

8. The prefabricated building envelope of deep foundation pit for construction in low temperature environment of claim 1, further comprising a fixing device, wherein the fixing device comprises a base (8) for fixing on the ground and a pull rod assembly (9), at least two clamping grooves (21) extending downwards from the upper end face are formed in the prefabricated concrete-filled steel tubular column (2), and the pull rod assembly (9) is provided with clamping rods extending downwards and capable of being inserted into the clamping grooves (21).

9. The deep foundation pit prefabricated building envelope for low-temperature environment construction of claim 8, wherein the horizontal cross section of the clamping groove is oblong.

10. The deep foundation pit prefabricated building enclosure for low-temperature environment construction according to claim 8, wherein the pull rod assembly (9) comprises a screw rod (91), a nut slider (92) installed on the screw rod (91), and a pull rod (93) fixedly connected with the nut slider (92), and the clamping rod is fixed below the tail end of the pull rod (93).