CN212641468U - Pit-in-pit rapid construction structure - Google Patents

Pit-in-pit rapid construction structure Download PDF

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Publication number
CN212641468U
CN212641468U CN202021312037.5U CN202021312037U CN212641468U CN 212641468 U CN212641468 U CN 212641468U CN 202021312037 U CN202021312037 U CN 202021312037U CN 212641468 U CN212641468 U CN 212641468U
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China
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pit
steel
construction
plate
caisson
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CN202021312037.5U
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Chinese (zh)
Inventor
刘卫未
马书杰
聂艳侠
史江川
谢志成
赵晓斌
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China Construction First Group Construction and Development Co Ltd
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China Construction First Group Construction and Development Co Ltd
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Abstract

The utility model discloses a pit in pit quick construction structure, adopted "separate + fall + seal" combined construction method, "separate" mainly adopt the steel caisson along with digging along with sinking to the design elevation, the buttress wall of steel caisson can play the water proof and prevent the effect that rich water stratum collapses, "fall" means to set up the dewatering system in the steel caisson inside, carry out the preliminary precipitation before pit in pit earthwork excavates, carry out continuous dewatering during pit in pit excavation and bottom plate construction, provide operating condition for pit in pit digging, seal "and guarantee the continuity of dewatering through the mode that sets up the steel casing pipe in the bottom plate during the construction of structural bottom plate," seal "and carry out the shutoff to steel casing pipe and lower part dewatering well after the bottom plate reaches design strength; grouting reinforcement or pit external precipitation measures are not needed before pit-in-pit earthwork excavation, the structure is simple, construction is rapid, and rapid excavation and rapid construction of the pit-in-pit of the water-rich stratum can be achieved.

Description

Pit-in-pit rapid construction structure
Technical Field
The utility model belongs to the technical field of the foundation ditch construction, in particular to hole quick construction structure in hole.
Background
In order to reasonably utilize urban land resources, various urban buildings are mostly provided with basements with different layers, especially local deep pits (referred to as pit-in-pit for short) such as a sump pit and an elevator pit are also arranged for meeting functional requirements, the construction of the pits-in-pit is generally complex, the whole construction progress of underground engineering is influenced to a certain extent, especially the pits-in-pit of the water-rich stratum increases the construction difficulty, and the risk of local later-stage leakage is possibly caused due to improper underground water treatment.
For pit-in-pit construction of a water-rich stratum, grouting reinforcement or pit-outside precipitation measures are generally adopted before pit-in-pit earthwork excavation so as to ensure stability of pit walls during pit-in-pit excavation, but grouting reinforcement can prolong a construction period to a certain extent, increase construction cost and ensure the pit-outside precipitation effect more difficultly. Therefore, the method is a technical problem of engineering research aiming at how to quickly construct the pit in the water-rich stratum pit and reduce the risk of water leakage.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pit in hole quick construction structure for solve the pit in to the rich water stratum construction degree of difficulty big, the long technical problem of construction period.
In order to achieve the above purpose, the utility model adopts the following technical scheme: pit quick construction structure in hole, include the precipitation well of digging the establishment in the pit middle part in rich water stratum, set up precipitation system in the precipitation well, be provided with the steel caisson that matches the size on the foundation ditch inside wall, the box that the steel caisson is link up from top to bottom, the foundation ditch bed course has been pour to the foundation ditch bottom, the precipitation well top is to having steel sleeve, steel caisson and steel sleeve carry out welded fastening with the bottom plate reinforcing bar, pour outside the foundation ditch for the concrete bottom plate, part adopts the cohesive soil to backfill below the steel sleeve infrabasal plate, steel sleeve infrabasal plate corresponds the position and adopts little expansion concrete to backfill, steel sleeve top welding steel shrouding, the concrete shrouding that is located the pit bottom that catchments is pour to the steel shrouding top.
By adopting the technical scheme, the construction method combining the steps of separating, lowering and sealing is adopted, wherein the separating mainly comprises the steps that a steel caisson sinks to a designed elevation along with excavation soil, a supporting wall of the steel caisson can play a role in water isolation and prevention of collapse of a water-rich stratum, the lowering refers to the fact that a water lowering system is arranged inside the steel caisson, pre-lowering is carried out before excavation of earth in the pit, continuous lowering is carried out during excavation of the pit in the pit and construction of a bottom plate, operation conditions are provided for excavation of the pit in the pit, the sealing refers to the fact that the continuity of lowering is guaranteed in a mode that a steel sleeve is arranged in the bottom plate during construction of a structural bottom plate, and the steel sleeve and a lower water lowering well are plugged after the bottom plate reaches the designed strength; grouting reinforcement or pit external precipitation measures are not needed before pit-in-pit earthwork excavation, the structure is simple, construction is rapid, and rapid excavation and rapid construction of the pit-in-pit of the water-rich stratum can be achieved.
Preferably, the well depth of the dewatering well exceeds the bottom of the pit in the pit by not less than 2 m.
Through adopting above-mentioned technical scheme, satisfy the precipitation requirement, precipitation is effectual.
Preferably, the steel caisson is formed by welding four steel plates with the thickness not less than 8mm to form a supporting wall, the welding line is full and has no gap, and the top end of the steel caisson is provided with a hanging hole with the diameter of 100-150 mm.
Through adopting above-mentioned technical scheme, the steel caisson can be hoisted by the hoist easily, convenient construction.
Preferably, the inner corners of the steel caisson are reinforced by corner brace welding.
Through adopting above-mentioned technical scheme, the structural stability of steel caisson is better.
Preferably, the thickness of the steel sleeve is not less than 8 mm.
Through adopting above-mentioned technical scheme, the structural stability of steel caisson is better.
Preferably, the bottom of the steel sleeve is sleeved outside the dewatering well, and the insertion size of the dewatering well is 50-100 mm.
Through adopting above-mentioned technical scheme, guarantee better continuous precipitation.
Preferably, the steel casing includes the casing wall, the casing wall outside is provided with the seal ring, the seal ring is provided with two places, is located upper and lower both ends respectively.
By adopting the technical scheme, better water stopping effect can be realized.
The beneficial effects of the utility model are embodied in: the construction method combining ' separation, falling and sealing ' is adopted, wherein the separation ' mainly comprises the steps that a steel caisson sinks to a designed elevation along with excavation, a supporting wall of the steel caisson can play a role in water isolation and prevention of collapse of a water-rich stratum, the ' falling ' refers to the fact that a water lowering system is arranged inside the steel caisson, pre-lowering is carried out before excavation of earthwork of a pit in the pit, continuous water lowering is carried out during excavation of the pit in the pit and construction of a bottom plate, operation conditions are provided for excavation of the pit in the pit, the ' sealing ' refers to the fact that the continuity of water lowering is guaranteed in a mode that a steel sleeve is arranged in the bottom plate during construction of a structural bottom plate, and the steel sleeve and a lower water lowering well are sealed after the bottom plate reaches the; grouting reinforcement or pit external precipitation measures are not needed before pit-in-pit earthwork excavation, the structure is simple, construction is rapid, and rapid excavation and rapid construction of the pit-in-pit of the water-rich stratum can be achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Drawings
FIG. 1 is a schematic diagram of the construction step 1 of the present invention;
FIG. 2 is a schematic diagram of the construction step 2 of the present invention;
FIG. 3 is a schematic diagram of the construction step 3 of the present invention;
FIG. 4 is a schematic diagram of the construction step 4 of the present invention;
FIG. 5 is a schematic diagram of the construction step 5 of the present invention;
FIG. 6 is a schematic diagram of the construction step 6 of the present invention;
FIG. 7 is a flowchart of a pit-in-pit construction sequence;
FIG. 8 is a schematic view of a steel caisson;
FIG. 9 is a schematic view of a precipitation system;
FIG. 10 is a schematic illustration of a steel casing.
Reference numerals: 1. a steel caisson; 11. a support wall; 12. corner brace; 13. hoisting holes; 2. a water-rich formation; 3. a precipitation system; 31. dewatering wells; 32. a water pump; 33. a drain pipe; 4. a foundation pit cushion layer; 5. steel casing; 51. a casing wall; 52. a water stop ring; 6. a concrete floor; 7. clay soil; 8. micro-expansive concrete; 9. a steel sealing plate; 10. and (5) a concrete closing plate.
Detailed Description
The technical solutions of the present invention are described in detail below by way of examples, which are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not for explaining the limitations of the technical solutions of the present invention.
Pit in pit quick construction structure, include the precipitation well 31 of establishing of digging at the pit in pit middle part of rich water stratum 2, set up precipitation system 3 in the precipitation well 31, be provided with the steel caisson 1 that matches the size on the foundation ditch inside wall, steel caisson 1 is the box that link up from top to bottom, foundation ditch bed course 4 has been pour to the foundation ditch bottom, precipitation well 31 top is docked there is steel casing 5, steel caisson 1 and steel casing 5 carry out welded fastening with the bottom plate reinforcing bar, it is concrete bottom plate 6 to pour outside the foundation ditch, the following part of steel casing 5 infrabasal plate adopts cohesive soil 7 to backfill, steel casing 5 infrabasal plate corresponds the position and adopts little expansive concrete 8 to backfill, steel casing 5 top welding steel shrouding 9, concrete shrouding 10 that is located the catchment pit bottom is pour to steel shrouding 9 top.
The construction method combining ' separation, falling and sealing ' is adopted, wherein the separation ' mainly comprises the steps that a steel caisson sinks to a designed elevation along with excavation, a supporting wall of the steel caisson can play a role in water isolation and prevention of collapse of a water-rich stratum, the ' falling ' refers to the fact that a water lowering system is arranged inside the steel caisson, pre-lowering is carried out before excavation of earthwork of a pit in the pit, continuous water lowering is carried out during excavation of the pit in the pit and construction of a bottom plate, operation conditions are provided for excavation of the pit in the pit, the ' sealing ' refers to the fact that the continuity of water lowering is guaranteed in a mode that a steel sleeve is arranged in the bottom plate during construction of a structural bottom plate, and the steel sleeve and a lower water lowering well are sealed after the bottom plate reaches the; grouting reinforcement or pit external precipitation measures are not needed before pit-in-pit earthwork excavation, the structure is simple, construction is rapid, and rapid excavation and rapid construction of the pit-in-pit of the water-rich stratum can be achieved.
The depth of the dewatering well 31 exceeds the bottom of the pit in the pit by not less than 2m, so that the dewatering requirement is met, and the dewatering effect is good.
The steel caisson 1 is formed by welding four steel plates with the thickness not less than 8mm to form a supporting wall 11, a welding seam is full and has no gap, a hanging hole is formed in the top end of the steel caisson 1, the diameter of the hanging hole 13 is 100-150 mm, and the steel caisson can be easily hoisted and is convenient to construct.
The inside bight of steel caisson 1 is consolidated through the welding of gusset 12, and the structural stability of steel caisson is better. The thickness of the steel sleeve 5 is not less than 8mm, and the structural stability of the steel caisson is good.
The bottom of the steel sleeve 5 is sleeved outside the dewatering well 31, the insertion size of the dewatering well is 50-100 mm, and good continuous dewatering is guaranteed. The steel casing includes casing wall 51, and the casing wall 51 outside is provided with seal ring 52, and seal ring 52 is provided with two, is located upper and lower both ends respectively, can realize better stagnant water effect.
The construction steps are as follows: step 1, before excavation of a pit in a water-rich stratum 2, a precipitation well 31 is arranged in the middle of the pit in the pit for pre-precipitation, a precipitation system 3 is arranged in the precipitation well 31, as shown in fig. 9, the precipitation system 3 comprises a water seepage pipe (an outer-wrapped double-layer dense mesh net), a water pump 32, a water drainage pipe 33 and the like, the precipitation process is not repeated in the prior art, positioning and paying-off are carried out according to the side line size of the pit in the pit, and a section of soil layer on the upper portion is excavated manually or mechanically to form a pit-in-pit positioning outline; manufacturing a steel caisson 1 with matched size according to the size of the pit in the pit, wherein the steel caisson 1 is a box type which is through from top to bottom;
step 2, hoisting the prepared steel caisson 1 into a pit-in-pit positioning outline by using hoisting equipment, checking the pit-in-pit positioning sideline again, and sinking after the pit-in-pit positioning sideline is determined to be correct;
step 3, alternately carrying out earth excavation, precipitation construction and steel caisson 1 sinking in the pit until the steel caisson 1 reaches the design elevation, and completing pouring of a foundation pit cushion layer 4 in time;
step 4, installing a steel sleeve 5 to continuously pump water in the pit, butting the steel sleeve 5 to the top of the dewatering well 31, constructing a pit bottom plate waterproof layer, a side wall waterproof layer and a protective layer in the pit, and reinforcing waterproof treatment at the bottom of the steel sleeve 5 and the junction of the steel sleeve and the waterproof layer;
step 5, welding and fixing the steel caisson 1, the steel sleeve 5 and the bottom plate steel bars in the middle pit of the construction pit, and pouring the concrete bottom plate 6 after acceptance inspection is qualified;
step 6, performing well sealing treatment on the dewatering well 31 after the strength of the concrete bottom plate 6 meets the design requirement, backfilling the part below the bottom plate in the steel sleeve 5 by using cohesive soil 7, backfilling the corresponding part of the bottom plate in the steel sleeve 5 by using micro-expansive concrete 8, and welding a steel sealing plate 9 at the top of the steel sleeve 5;
and 7, roughening the concrete on the bottom surface of the water collecting pit, and pouring a concrete sealing plate 10 in the water collecting pit after cleaning.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.

Claims (7)

1. Pit-in-pit rapid construction structure is characterized in that: the construction method comprises a dewatering well (31) arranged in the middle of a pit in a water-rich stratum (2), a dewatering system (3) is arranged in the dewatering well (31), a steel caisson (1) with matched size is arranged on the inner side wall of a foundation pit, the steel caisson (1) is a box type which is communicated up and down, a foundation pit cushion layer (4) is poured at the bottom of the foundation pit, a steel sleeve (5) is butt-jointed to the top of the dewatering well (31), the steel caisson (1) and the steel sleeve (5) are welded and fixed with a bottom plate steel bar, a concrete bottom plate (6) is poured outside the foundation pit, the lower part of the bottom plate in the steel sleeve (5) is backfilled by using cohesive soil (7), the corresponding part of the bottom plate in the steel sleeve (5) is backfilled by using micro-expansion concrete (8), a steel closing plate (9) is welded at the top of the steel sleeve (5), and a concrete.
2. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the well depth of the dewatering well (31) exceeds the bottom of the pit in the pit by not less than 2 m.
3. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the steel caisson (1) is formed by welding four steel plates with the thickness not less than 8mm to form a supporting wall (11), a welding seam is full and has no gap, a hanging hole is formed in the top end of the steel caisson (1), and the diameter of the hanging hole (13) is 100-150 mm.
4. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the inner side corner of the steel caisson (1) is welded and reinforced through a corner support (12).
5. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the thickness of the steel sleeve (5) is not less than 8 mm.
6. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the bottom of the steel sleeve (5) is sleeved outside the dewatering well (31), and the insertion size of the dewatering well is 50-100 mm.
7. The pit-in-pit rapid construction structure according to claim 1, characterized in that: the steel casing comprises a casing wall (51), wherein a water stop ring (52) is arranged on the outer side of the casing wall (51), and the water stop ring (52) is provided with two positions which are respectively positioned at the upper end and the lower end.
CN202021312037.5U 2020-07-07 2020-07-07 Pit-in-pit rapid construction structure Active CN212641468U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021312037.5U CN212641468U (en) 2020-07-07 2020-07-07 Pit-in-pit rapid construction structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021312037.5U CN212641468U (en) 2020-07-07 2020-07-07 Pit-in-pit rapid construction structure

Publications (1)

Publication Number Publication Date
CN212641468U true CN212641468U (en) 2021-03-02

Family

ID=74787792

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021312037.5U Active CN212641468U (en) 2020-07-07 2020-07-07 Pit-in-pit rapid construction structure

Country Status (1)

Country Link
CN (1) CN212641468U (en)

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