CN204940298U - A kind of Composite Enclosure Structure of base pit engineering - Google Patents
A kind of Composite Enclosure Structure of base pit engineering Download PDFInfo
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- CN204940298U CN204940298U CN201520522433.3U CN201520522433U CN204940298U CN 204940298 U CN204940298 U CN 204940298U CN 201520522433 U CN201520522433 U CN 201520522433U CN 204940298 U CN204940298 U CN 204940298U
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Abstract
The Composite Enclosure Structure of a kind of base pit engineering of the present utility model, relates to foundation pit enclosure structure technical field, implements for diaphragm wall, deeply and does not take reinforcement measure to cause the problem of the unfavorable phenomenon such as shape and bottom heave as increasing foundation ditch digs.Composite Enclosure Structure comprises the bored pile inside diaphragm wall, tamps high-pressure rotary jet grouting pile between the two; Be fixed on the sole plate on bored pile and high-pressure rotary jet grouting pile top, the edge of sole plate bottom surface is also provided with down and turns over bracket.
Description
Technical field
The utility model relates to foundation pit enclosure structure field of engineering technology, particularly a kind of Composite Enclosure Structure of base pit engineering.
Background technology
In base pit engineering, the space enclosing structure of foundation ditch periphery directly bears lateral earth pressure and water pressure, and above-mentioned soil pressure and water pressure are passed to the support system in foundation ditch.Conventional space enclosing structure comprises soil nail wall, Cement-soil Gravity enclosure wall, diaphragm wall, castinplace pile campshed enclosure wall, shaped steel Soil-cement Wall, steel sheet pile enclosure wall and reinforced concrete sheet pile enclosure wall etc.
For the base pit engineering that cutting depth is larger, the above-mentioned diaphragm wall of main employing and row of bored piles enclosure wall two kinds of space enclosing structures.Diaphragm wall is the continuous grooving of original position and builds the reinforced concrete wall pannel of formation, there is gear soil and water proof double action, diaphragm wall rigidity greatly, good integrity, in digging process, safety is high, Supporting Structure deformation is less, can combining main body structure design as outer wall of basement.Mainly be applicable to the base pit engineering of the degree of depth comparatively large (being greater than 10m), contiguous exist protection and require higher construction of structures, to the engineering that foundation ditch itself is out of shape and waterproof requirement is higher and engineering ground limited space, and outer wall of basement and the nearer engineering of red line; Row of bored piles enclosure wall is the space enclosing structure adopting the bored pile of continuous colonnade formula arrangement to be formed, all applicable for the foundation ditch in weak soil, powder sandy soil, boulder and cobble and rock stratum, the feature such as have that construction technology is simple, the easy and cost of technical maturity, quality control is low.
At present, in order to fully utilize Underground Space Resource, Urban Underground Space Excavation just progressively by shallow-layer to Deep Development.When underground continuous wall-enclosure structure is implemented, if for the utilization rate improving the underground space, take to strengthen merely digging depth to increase the basement number of plies, and reinforcement measure is not taked to former space enclosing structure, easily there is the unfavorable phenomenons such as underground continuous wall-enclosure structure distortion and bottom heave in work progress, therefore, how effective reinforcing design and construction are carried out to former space enclosing structure, thus both met the requirement of job specfication, can improve again the utilization rate of the underground space, be the technical barrier that those skilled in the art face.
Summary of the invention
For when existing underground continuous wall-enclosure structure is implemented, for the utilization rate and strengthening improving the underground space is dug dark, the problem of the unfavorable phenomenons such as the distortion of former space enclosing structure and bottom heave will be caused if do not taked corresponding reinforcement measure, the purpose of this utility model there is provided a kind of Composite Enclosure Structure of base pit engineering, the Composite Enclosure Structure utilizing diaphragm wall to combine with bored pile is to increase its embedded depth and lateral rigidity, and the mode of bracket and ater-casting is turned in employing under setting up on sole plate, complete the support replacement before collar tie beam and reinforced concrete support dismounting, thus ensure that the construction safety of foundation ditch also controls the distortion of foundation ditch effectively.
The utility model solves the Composite Enclosure Structure of a kind of base pit engineering that its technical problem adopts, and comprises the diaphragm wall enclosed outside foundation ditch; The continuously arranged some bored piles in inner side along described diaphragm wall, and the degree of depth of described bored pile is greater than the degree of depth of described diaphragm wall; Space between described diaphragm wall and described bored pile is tamped by high-pressure rotary jet grouting pile; And be fixed on the sole plate on described bored pile and described high-pressure rotary jet grouting pile top, and described sole plate offsets with the described diaphragm wall being positioned at its side, the edge of described sole plate bottom surface is also provided with down and turns over bracket, and the end and the described bored pile that turn over bracket under described offset.
Preferably, described sole plate and described under turn over bracket bottom be also provided with waterproofing course, the below of described waterproofing course is equipped with concrete cushion.
Preferably, the beeline D1 at the center of described diaphragm wall and described bored pile is 400mm ~ 800mm.
Better, the beeline D1 at the center of described diaphragm wall and described bored pile is 500mm.
Preferably, the center distance D2 of adjacent two described bored piles is 500mm ~ 800mm.
The Composite Enclosure Structure of the utility model base pit engineering, continuously arranged bored pile is set up by the inner side of having implemented diaphragm wall in base pit engineering, and reinforcing is tamped by high-pressure rotary jet grouting pile in the space between diaphragm wall and bored pile, thus improve lateral rigidity and the embedded depth of Composite Enclosure Structure; And, the end of sole plate is set up in the stake top of bored pile and high-pressure rotary jet grouting pile, the edge of sole plate bottom surface is also provided with to offset down with bored pile and turns over bracket, thus enhance the stability that sole plate is connected with side space enclosing structure, and solve the problems such as the yielding and bottom heave of the former space enclosing structure caused because foundation ditch digs dark increasing.
Accompanying drawing explanation
Fig. 1 is the sectional drawing of the Composite Enclosure Structure of the base pit engineering of the utility model one embodiment;
Fig. 2 is the top view of the Composite Enclosure Structure of the base pit engineering of the utility model one embodiment;
Fig. 3 to Figure 10 is the schematic diagram of the construction method of the Composite Enclosure Structure of the utility model one embodiment base pit engineering.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the Composite Enclosure Structure of a kind of base pit engineering that the utility model proposes is further described.According to explanation below and claims, advantage of the present utility model and feature will be clearer.Below by cited embodiment by reference to the accompanying drawings, technology contents of the present utility model and feature will be described in detail.Need to illustrate in addition, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, aid illustration the utility model embodiment lucidly.For sake of convenience, hereinafter described " on ", D score is consistent with the upper and lower direction of accompanying drawing, but this can not become the restriction of technical solutions of the utility model.
Embodiment one: the present embodiment is with floor space 1.64 ten thousand m
2the construction of certain base pit engineering be example, foundation ditch excavates according to the projected depth that underground is two-layer and constructs and completes diaphragm wall, afterwards, according to owner's requirement, by two-layer for the underground F3/B3 that is adjusted to improve the utilization rate of the underground space, therefore, effective reinforcing design and construction need be carried out to former underground exterior-protected structure, to meet the requirement of job specfication, the Composite Enclosure Structure of the present embodiment base pit engineering is described below in conjunction with Fig. 1 and Fig. 2, it comprises the diaphragm wall 10 enclosed outside foundation ditch; The continuously arranged some bored piles 20 in inner side along diaphragm wall 10, and the degree of depth of bored pile 20 is greater than the degree of depth of diaphragm wall 10; Space between diaphragm wall 10 and bored pile 20 is tamped by high-pressure rotary jet grouting pile 30; And be fixed on the sole plate 80 on bored pile 20 and high-pressure rotary jet grouting pile 30 top, and sole plate 80 offsets with the diaphragm wall 10 being positioned at its side, the edge of sole plate 80 bottom surface is also provided with down and turns over bracket 82, under turn over the end of bracket 82 and bored pile 20 offsets.
The Composite Enclosure Structure of the utility model base pit engineering, continuously arranged bored pile 20 is set up by the inner side of having implemented diaphragm wall 10 in base pit engineering, and reinforcing is tamped by high-pressure rotary jet grouting pile 30 in the space between diaphragm wall 10 and bored pile 20, thus improve lateral rigidity and the embedded depth of Composite Enclosure Structure; And, the end of sole plate 80 is set up in the stake top of bored pile 20 and high-pressure rotary jet grouting pile 30, the edge of sole plate 80 bottom surface is also provided with to offset down with bored pile 20 and turns over bracket 82, thus enhance the stability that sole plate 80 is connected with side space enclosing structure, and solve the problems such as the yielding and bottom heave of the former space enclosing structure caused because foundation ditch digs dark increasing.
Preferably, sole plate 80 and under turn over bracket 82 bottom be also provided with waterproofing course (not shown), the below of waterproofing course is equipped with concrete cushion, to meet the waterproof construction requirement of underground construction.
Preferably, as shown in Figure 10, diaphragm wall 10 is 400mm ~ 800mm with the beeline D1 at the center of bored pile 20, and to ensure can normally return slurry, grout when spraying, the present embodiment space D 1 is preferably 500mm.The diameter of above-mentioned bored pile 20 is 600mm, the center distance D2 of adjacent two bored piles 20 is 500mm ~ 800mm, adopt the continuously arranged bored pile 20 of above-mentioned layout density, the inner side space enclosing structure of foundation ditch can be formed, and itself and diaphragm wall 10 consolidation are integrated by high-pressure rotary jet grouting pile 30, thus improve the overall lateral rigidity of Composite Enclosure Structure.
The work progress of the Composite Enclosure Structure of the base pit engineering of the present embodiment is described below in conjunction with Fig. 3 to Figure 10:
One, for meeting the requirement of soil excavation to deep pit monitor and environmental protection, as shown in Figure 1, some continuously arranged bored piles 20 are set up in inner side (with the side towards foundation ditch center for inner side) along the diaphragm wall 10 of base pit engineering, bored pile 20 and diaphragm wall 10 interval are arranged and its degree of depth is greater than the degree of depth of diaphragm wall 10, and the space between diaphragm wall 10 and bored pile 20 is filled up by high-pressure rotary jet grouting pile 30 and reinforced; And some vertical stand column pile 40 of also constructing bottom foundation ditch are to reinforce bottom foundation ditch; In the present embodiment, the degree of depth of diaphragm wall 10 is 25m, the length of bored pile 20 is 24.1m, the end absolute altitude (referring to the absolute altitude value of the component bottom) of bored pile 20, lower than the end absolute altitude 3m ~ 5m of diaphragm wall 10, makes the degree of depth of the present embodiment Composite Enclosure Structure be increased to 31.3m by 25m;
Two, from top to bottom step excavation soil mass of foundation pit, according to the designing requirement of Main Underground body structure, successively to construct collar tie beam and reinforced concrete support, namely adopt fringe truss (collar tie beam)+opposite supporting type horizontal struts system, and in conjunction with the mode of stand column pile vertical supporting; Specifically, as shown in Figure 2, construction first collar tie beam 50, the excavation pit soil body designs below end absolute altitude 500mm to first reinforced concrete support 51, so that construction bridge plate face and first reinforced concrete support 51; As shown in Figure 3, step excavation soil mass of foundation pit designs below end absolute altitude 200mm to second reinforced concrete support 61, construction second collar tie beam 60 and second reinforced concrete support 61, make second collar tie beam 60 be positioned at the stake top of bored pile 20 and high-pressure rotary jet grouting pile 30; As shown in Figure 4, step excavation soil mass of foundation pit designs below end absolute altitude 200mm to the 3rd road reinforced concrete support 71, construction the 3rd road collar tie beam 70 and the 3rd road reinforced concrete support 71;
Three, as shown in Figure 5, step excavation soil mass of foundation pit designs below end absolute altitude 250mm to sole plate 80, and sole plate 80 of constructing, sole plate 80 is offseted with the bored pile 20 being positioned at its both sides, and reserve notch in sole plate 80 top edge, for ensureing the structural strength that sole plate 80 edge is enough, sole plate 80 lower edge has also been constructed down and has been turned over bracket 82; After the concrete of sole plate 80 reaches the intensity of designing requirement, as shown in Figure 6 to 8, often remove one deck collar tie beam and reinforced concrete support from the bottom to top, construction one deck Main Underground body structure; Specifically, as shown in Figure 5 and Figure 6, remove the 3rd road collar tie beam 70 and the 3rd road reinforced concrete support 71, and the bored pile 20 removed above absolute altitude at the bottom of sole plate 80 notch and high-pressure rotary jet grouting pile 30, between sole plate 80 and diaphragm wall 10, form an ater-casting 81; As shown in Figure 7 and Figure 8, concreting in ater-casting 81, makes the concrete of ater-casting 81 and sole plate 80 consolidation be integrated, and integral erection is in the stake top of bored pile 20 and high-pressure rotary jet grouting pile 30, completes the construction of Composite Enclosure Structure.
Further, after above-mentioned Composite Enclosure Structure has been constructed, take sole plate 80 as the F3/B3 of Construction of Supporting Main Underground body structure 90; Subsequently, remove second collar tie beam 60 and second reinforced concrete support 61, above the F3/B3 of Main Underground body structure 90 under construction ground two layers; Finally, continue to remove first collar tie beam 50 and first reinforced concrete support 51, and B1 of constructing above two layers, the underground of Main Underground body structure 90, thus complete the construction integrally descending agent structure 90.
When diaphragm wall 10 for base pit engineering is implemented, the reinforcement measure to former space enclosing structure taked for the number of plies of increase Main Underground body structure 90, for this reason, work progress of the present utility model follows the basic principle " first supportting and tear open afterwards " in bracing of foundation pit design and construction, some continuously arranged bored piles 20 are set up in inner side along diaphragm wall 10, gap between bored pile 20 and diaphragm wall 10 is filled up by high-pressure rotary jet grouting pile 30 and is reinforced, form Composite Enclosure Structure, Composite Enclosure Structure embedded depth is strengthened, side direction bending resistance strengthens, step excavation soil mass of foundation pit from top to bottom, and successively construct collar tie beam and reinforced concrete support, in the work progress of sole plate 80, first reserve notch in the top edge of sole plate 80, bracket 82 is turned under the lower edge construction of sole plate 80, again by the collar tie beam of bottom and reinforced concrete support, and more than notch bottom surface bored pile 20 and high-pressure rotary jet grouting pile 30 are removed, thus between sole plate 80 and diaphragm wall 10, form an ater-casting 81, be integrated with sole plate 80 consolidation after this ater-casting 81 concreting, thus make sole plate 80 firmly can be supported on the top of bored pile 20 and high-pressure rotary jet grouting pile 30, and under turn over bracket 82 and tightly can offset with the bored pile 20 of side, thus complete the support replacement of bottom collar tie beam and reinforced concrete support, subsequently, with sole plate 80 be rely on the bottom-up construction progressively completing support replacement and each layer of Main Underground body structure 90.Visible, the compound utilizing diaphragm wall 10 to combine with bored pile 20 goes along with sb. to guard him mode to increase its embedded depth and lateral rigidity, and the mode of bracket 82 and ater-casting 81 is turned in employing under setting up on sole plate 80, complete the support replacement before collar tie beam and reinforced concrete support dismounting, thus ensure that the construction safety of foundation ditch also controls the distortion of foundation ditch effectively.
Preferably, in step 3, foundation ditch dig dark deepen 1m under turn over bracket 82 and design below end absolute altitude 250mm, so that turn over bracket 82 under construction, and concrete cushion of constructing successively from the bottom to top, waterproofing course, under turn over bracket 82 and sole plate 80, to meet the waterproof construction requirement of underground construction; The thickness of above-mentioned sole plate 80 is 1m, under turn over bracket 82 width be about 1.5m.
Preferably, in step 3, do waterproof construction at ater-casting 81 reinforcement planting, reinforcing bar in ater-casting 81 is connected with the embedded bar in sole plate 80, subsequently, concreting in ater-casting 81, ater-casting 81 and sole plate 80 consolidation are integrated, and, because doing waterproof construction, ater-casting 81 can be avoided to occur with the junction of sole plate 80 and diaphragm wall 10 phenomenon that seeps water.
Foregoing description is only the description to the utility model preferred embodiment; any restriction not to the utility model scope; any change that the those of ordinary skill in the utility model field does according to above-mentioned disclosure, modification, all belong to the protection domain of claims.
Claims (5)
1. a Composite Enclosure Structure for base pit engineering, is characterized in that, comprising:
Enclose the diaphragm wall outside foundation ditch;
The continuously arranged some bored piles in inner side along described diaphragm wall, and the degree of depth of described bored pile is greater than the degree of depth of described diaphragm wall;
Space between described diaphragm wall and described bored pile is tamped by high-pressure rotary jet grouting pile;
And be fixed on the sole plate on described bored pile and described high-pressure rotary jet grouting pile top, and described sole plate offsets with the described diaphragm wall being positioned at its side, the edge of described sole plate bottom surface is also provided with down and turns over bracket, and the end and the described bored pile that turn over bracket under described offset.
2. the Composite Enclosure Structure of base pit engineering according to claim 1, is characterized in that: described sole plate and described under turn over bracket bottom be also provided with waterproofing course, the below of described waterproofing course is equipped with concrete cushion.
3. the Composite Enclosure Structure of base pit engineering according to claim 1, is characterized in that: the beeline D1 at the center of described diaphragm wall and described bored pile is 400mm ~ 800mm.
4. the Composite Enclosure Structure of base pit engineering according to claim 3, is characterized in that: the beeline D1 at the center of described diaphragm wall and described bored pile is 500mm.
5. the Composite Enclosure Structure of the base pit engineering according to any one of Claims 1-4, is characterized in that: the center distance D2 of adjacent two described bored piles is 500mm ~ 800mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178327A (en) * | 2015-07-17 | 2015-12-23 | 上海建工七建集团有限公司 | Composite retaining structure of foundation pit project and construction method thereof |
| CN107386297A (en) * | 2017-07-14 | 2017-11-24 | 深圳市工勘岩土集团有限公司 | Deep weathered rock formation foundation ditch water sealing structure |
| CN107829440A (en) * | 2017-12-06 | 2018-03-23 | 上海市机械施工集团有限公司 | Reinforcement structure and its construction method at underground continuous wall seam |
| CN110158630A (en) * | 2019-05-31 | 2019-08-23 | 广西路桥工程集团有限公司 | A kind of deep covering layer area large-span arch bridge annular ground continuous wall base |
-
2015
- 2015-07-17 CN CN201520522433.3U patent/CN204940298U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178327A (en) * | 2015-07-17 | 2015-12-23 | 上海建工七建集团有限公司 | Composite retaining structure of foundation pit project and construction method thereof |
| CN107386297A (en) * | 2017-07-14 | 2017-11-24 | 深圳市工勘岩土集团有限公司 | Deep weathered rock formation foundation ditch water sealing structure |
| CN107829440A (en) * | 2017-12-06 | 2018-03-23 | 上海市机械施工集团有限公司 | Reinforcement structure and its construction method at underground continuous wall seam |
| CN110158630A (en) * | 2019-05-31 | 2019-08-23 | 广西路桥工程集团有限公司 | A kind of deep covering layer area large-span arch bridge annular ground continuous wall base |
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