CN209799980U - Integral advance support board canopy - Google Patents
Integral advance support board canopy Download PDFInfo
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- CN209799980U CN209799980U CN201920410393.1U CN201920410393U CN209799980U CN 209799980 U CN209799980 U CN 209799980U CN 201920410393 U CN201920410393 U CN 201920410393U CN 209799980 U CN209799980 U CN 209799980U
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- inserting plate
- picture peg
- advance support
- support board
- arch
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Abstract
The utility model relates to an integral advance support board canopy, including a plurality of parallel arrangement's arch leading truck and a plurality of picture peg groups of locating the arch leading truck outside, wherein, picture peg group includes a plurality of picture pegs, interconnect between the picture peg, and the picture peg one end of each picture peg group is connected with the arch leading truck, and the other end inserts the soil body through the guiding hole of gradually external radiation. The utility model discloses can provide safe and reliable's construction space for the underground works excavation in the ability stratum of no self-stabilization, can avoid hunch portion collapse and swift current slump basically to can play better stagnant water effect. The utility model discloses mainly utilize the rigidity and the intensity of picture peg self to strut, basically irrelevant with the physical mechanics characteristic of consolidating the soil body, and the work progress is few, and is fast, and upright support protects immediately, can play fine supporting effect to the loose soil body of hunch portion. The underground engineering is assembled, the construction is simple and convenient, and the popularization is easy.
Description
Technical Field
the utility model relates to a supporting plate canopy, concretely relates to integral advance supporting plate canopy belongs to the advance support field.
Background
with the acceleration of the urbanization process in China, urban construction enters a new development stage, the demand for developing and utilizing underground spaces is continuously increased, and particularly, geological problems and site conditions encountered by underground engineering construction such as near-surface pipe corridors, electric power communication tunnels, underground street crossing channels and the like are more and more difficult. Because the buried depth is shallow, even ultra-shallow, the stratum conditions mainly include small-particle soil layers such as filling soil, clay, silt and sandy soil, and the stratum basically has no self-stability. And the urban area has heavy traffic, the underground pipelines are dense, the structures are numerous, and the near-surface underground engineering construction often causes the problems of broken roads, large-scale pipeline moving and modifying and the like.
When underground engineering in urban areas is constructed by adopting an underground excavation method under the condition of site limitation and open excavation, the traditional advanced treatment measures such as the advanced small guide pipe and the advanced large pipe shed have higher requirements on underground engineering buried depth, soil layer physical and mechanical indexes, grouting suitability and the like, the advanced small guide pipe has the problems of difficult pore forming, poor grouting effect, surface slurry bleeding, difficult control of stratum settlement, easy collapse and the like in partial shallow buried soil layers, the advanced large pipe shed also has the problems of large construction space requirement, high cost, slow progress and the like, the increased underground engineering buried depth can be placed in a better soil layer, the waste of urban underground space resources can be caused, and the development and utilization of long-term urban underground space are influenced. Therefore, a forward supporting measure for underground engineering, which can provide a safe excavation space and has small disturbance to the soil layer, is urgently needed for the soil layer without open excavation conditions, buried deep and shallow (even ultra-shallow) and poor engineering geological conditions.
SUMMERY OF THE UTILITY MODEL
The limitation of advance support measure when adopting the undercut method construction to above-mentioned current underground works, the utility model provides an integral advance support board canopy, the utility model discloses an integral advance support board canopy is adapted to from the steady ability poor or do not have from steady ability, should the shallow soil property underground works that buries that collapses, and its rigidity and the intensity that mainly utilizes picture peg self are strutted, and is basically irrelevant with the physical and mechanical characteristics who consolidates the soil body, strut as a whole after the picture peg shutting, and is fast, safe and reliable, waterproof performance good to the stratum reinforcement, and is little to the stratum disturbance.
the utility model discloses specific technical scheme as follows:
The utility model provides an integral advance support sheet canopy, includes a plurality of parallel arrangement's arch leading truck and locates a plurality of picture peg groups in the arch leading truck outside, and wherein, picture peg group includes a plurality of picture pegs, interconnect between the picture peg, and the picture peg one end of each picture peg group is connected with the arch leading truck, and the other end inserts the soil body through the guiding hole of gradually outwards radiating. The guide holes are pre-drilled at the two sides of the inserting plate, so that the inserting plate can be pushed in and positioned conveniently, and when the inserting plate is difficult to push in, the guide holes can be additionally arranged at the middle position of the inserting plate, so that the soil resistance is reduced.
Furthermore, the width of the front end of the inserting plate is larger than that of the tail end of the inserting plate, so that a semi-horn-mouth-shaped plate shed is formed after the inserting plate is locked, and the two ring plate sheds can be effectively lapped. The two sides of the insertion plates are provided with groove type locking openings, and the insertion plates are connected through the groove type locking openings. The inserting plate and the guide frame form a combined support.
Furthermore, the front end of the inserting plate is in a cutting edge shape. The insertion plate is favorable for being pushed into the soil layer. When the inserting plate is difficult to jack in, angle steel can be welded at the tail end so as to apply jacking acting force to the inserting plate.
Furthermore, the arch guide frame comprises a plurality of upper arch frame bodies and arc frame bodies arranged below the arch frame bodies, and the arch frame bodies and the arc frame bodies are parallel to each other and are connected through connecting pieces.
Furthermore, the shapes of the slot type locking openings at two sides of the inserting plate are different, and the slot type locking opening at one side of the inserting plate is matched with the slot type locking opening at the other side of the other inserting plate in shape.
Furthermore, the length of the insertion plate is 3.5 m-5.0 m, and the overlapping length of the two insertion plate groups is not less than 1.0 m.
compared with the prior art, the beneficial effects of the utility model are that:
(1) The utility model discloses a fore shaft of the long limit lateral margin of picture peg is chain each other and is formed wholly, utilizes the high rigidity high strength of picture peg self material to strut, and is basically irrelevant with the physical mechanics characteristic who consolidates the soil body, and waterproof leak protection soil behind the interlock can avoid hunch portion collapse and swift current slump basically to can play better stagnant water effect. And the components are modularized, the use is simple and easy, the connection between the plugboards is firm, and the overall performance is excellent. The defects that the conventional advanced anchor rod, the advanced small guide pipe and the like have long time for reinforcing soil layer slurry gel, the grouting effect is difficult to ensure, a bulk supporting structure and the like are overcome.
(2) The utility model discloses strut intensity and rigidity size can be according to soil layer condition and site conditions design, can provide safe and reliable's construction space for the underground works excavation in the no self-stabilization ability stratum, and it is effectual to consolidate the effect and control the earth's surface settlement. The method is particularly suitable for small-particle soil layers such as filling soil, cohesive soil, silt soil, sandy soil and the like, and can also be suitable for high-groundwater-level strata after measures such as face grouting water plugging, precipitation and the like are adopted.
(3) The utility model discloses construction process is few, and is fast, and the vertical support protects immediately, can play fine effect of strutting to the loose soil body of hunch portion. The underground engineering is assembled, the construction is simple and convenient, and the popularization is easy.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the socket of the present invention;
Fig. 3 is a side view of the present invention;
Fig. 4 is the structure diagram of the supporting at the step of the present invention.
Detailed Description
the following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Example 1
As shown in fig. 1, the integral advanced supporting board shed of this embodiment includes a plurality of arch guide frames arranged in parallel and a plurality of board groups arranged outside the arch guide frames, wherein the board groups include a plurality of boards 2, the boards 2 are connected with each other, one end of each board 2 is arranged on the arch guide frame, and the other end of each board forms a certain included angle with the outer surface of the arch guide frame. The arch guide frame comprises a plurality of upper arch frame bodies 1 and arc frame bodies 4 arranged below the arch frame bodies 1, wherein the arch frame bodies 1 and the arc frame bodies 4 are parallel to each other and are connected through connecting pieces 3. And the guide frame and the adjacent steel frame are welded and fixed by adopting longitudinal angle steel.
as shown in figure 2, the width b of the front end 2.2 of the inserting plate is larger than the width d of the tail end 2.1, so that the inserting plate forms a semi-flared plate shed after being locked, and the two annular plate sheds can be effectively lapped. The two sides of the inserting plate are provided with a first groove type locking notch 2.3 and a second groove type locking notch 2.4, and the inserting plate 2 is connected through the groove type locking notches. The first slot type fore shaft 2.3 of the plug board is connected with the second slot type fore shaft 2.4 of another plug board, and the shape of the first slot type fore shaft 2.3 is matched with that of the second slot type fore shaft 2.4.
As shown in fig. 3 and 4, the tail end of each insert plate group is welded with the arched guide frame, and the other end of each insert plate group is inserted into the soil body through the guide holes 7 which radiate outwards gradually. And guide holes are pre-drilled at the two sides of the inserting plate, so that the inserting plate is favorable for jacking and positioning. The guiding hole can be arranged along the excavation contour line of the underground engineering arch.
The front end 2.2 of the inserting plate is in a cutting edge shape, which is beneficial to the inserting plate to push into the soil layer. When the insertion plate is difficult to jack in, angle steel can be welded at the tail end so as to apply jacking acting force to the insertion plate.
As shown in fig. 4, when the support is carried out in the embodiment, the overall shape is matched with that of the step 6, the included angle between the inserting plate group and the longitudinal axis of the underground engineering is alpha, and further, the inserting plate group radiates outwards along the outer side of the arch-shaped guide frame in an alpha mode.
the supporting method of the integral type advanced supporting plate shed comprises the following specific steps:
step (1), erecting a guide frame
after the tunnel face is excavated, the concrete is sprayed primarily on the arch part, a guide frame is erected, and the concrete is not sprayed at the construction spile. The steel frame is strutted to usable underground works of leading truck, adopts vertical angle steel welded fastening between leading truck and the neighbouring steel frame, and the leading truck takes place deformation and displacement when guaranteeing the picture peg jack-in. When necessary, concrete can be sprayed on the tunnel face to provide a safe construction space for the construction of the board shed.
Step (2), positioning and drilling a middle guide hole
The guide holes are positioned according to the spatial positions of the locking notches on the two sides of the long edge of the plugboard. The guide holes at two ends of the inserting plate at the middle position of the arch part are firstly made, and the position of a drilled hole and an external inserting angle (an included angle with the longitudinal axis of the underground engineering) meet the design requirement and ensure the precision. The length of the guide hole is equal to that of the insert plate.
Step (3), jacking and checking the middle plugboard
And jacking the middle plugboard along the guide holes at the two ends of the plugboard at the middle position, checking the insertion angle and position of the plugboard after the plugboard is inserted into the soil layer in place, and firmly welding the tail end of the plugboard with the guide frame after the plugboard is qualified. When the plugboard is pushed in, dislocation or deviation occurs, the plugboard is corrected in time, and when the plugboard cannot be corrected, the plugboard is pulled out and then pushed in again.
Step (4), inserting the plugboards at two sides in sequence
and constructing a guide hole of the left side adjacent to the middle plugboard, wherein the locking notch of one side of the left side adjacent to the plugboard is meshed with the locking notch of the middle plugboard, and the other side of the left side adjacent to the plugboard corresponds to the guide hole of the other side of the left side adjacent to the plugboard and pushes the guide hole into the soil layer.
Inserting the adjacent plugboards on the right side according to the steps, then performing construction from the middle to the two sides one by one until the jacking of all the plugboards is completed, and forming combined advanced support by the plugboards and the guide frame as shown in figures 3 and 4.
The length of the inserting plate 2 is more than 2 times of the excavation circulating feed ruler, preferably 3.5 m-5.0 m, the two inserting plate groups are overlapped, and the overlapping length of the two inserting plate groups is not less than 1.0 m.
when the inserting plate is inserted into a soil layer, the jacking force is calculated according to the following formula:
F＝η(a+b+2d)lq
q＝γhtanΦ
Wherein:
F, jacking force required by each plug board;
eta-empirical coefficient can be determined according to field test, and can be 1.2-1.5 when no experience exists;
a-the width (m) of the tail end of the board;
b-board front width (m);
Alpha-inset angle (included angle with the longitudinal axis of the underground works);
R-equivalent radius of arc arch part of excavation contour line;
d-insert plate thickness (m);
l-insert length (m);
q-friction force (kpa) between the surface of the insert plate and the soil layer;
Gamma-soil layer Severe (KN/m)3)；
h-the distance between the inserting plate and the ground surface is buried by the depth (m);
Phi-the soil layer comprehensive internal friction angle.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides an integral advance support board canopy which characterized in that: the soil body inserting device comprises a plurality of arc-shaped guide frames arranged in parallel and a plurality of inserting plate groups arranged on the outer sides of the arc-shaped guide frames, wherein the inserting plate groups comprise a plurality of inserting plates which are mutually connected, one end of each inserting plate group is connected with the arc-shaped guide frames, and the other end of each inserting plate group is inserted into a soil body through guide holes which gradually radiate outwards.
2. The integral type advance support board shed according to claim 1, characterized in that: the width of the front end of each plug board is larger than that of the tail end of each plug board, slot type locking notches are formed in two sides of each plug board, and the plug boards are connected through the slot type locking notches.
3. the integral type advance support board shed according to claim 2, characterized in that: the front end of the inserting plate is in a cutting edge shape.
4. The integral type advance support board shed according to claim 1, characterized in that: the arch guide frame comprises a plurality of upper arch frame bodies and arc frame bodies arranged below the arch frame bodies, and the arch frame bodies and the arc frame bodies are parallel and connected through connecting pieces.
5. The integral type advance support board shed according to claim 2, characterized in that: the slot type locking openings at two sides of the inserting plate are different in shape, and the slot type locking opening at one side of the inserting plate is matched with the slot type locking opening at the other side of the other inserting plate in shape.
6. The integral type advance supporting board shed according to claim 1, wherein the lengths of the inserting plates are 3.5m ~ 5.0.0 m, and the overlapping length of the two inserting plate groups is not less than 1.0 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920410393.1U CN209799980U (en) | 2019-03-28 | 2019-03-28 | Integral advance support board canopy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920410393.1U CN209799980U (en) | 2019-03-28 | 2019-03-28 | Integral advance support board canopy |
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| CN209799980U true CN209799980U (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828048A (en) * | 2020-07-28 | 2020-10-27 | 中建七局安装工程有限公司 | Method for preventing powder soil from collapsing at top of shallow-buried and underground-excavated tunnel construction hole |
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2019
- 2019-03-28 CN CN201920410393.1U patent/CN209799980U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828048A (en) * | 2020-07-28 | 2020-10-27 | 中建七局安装工程有限公司 | Method for preventing powder soil from collapsing at top of shallow-buried and underground-excavated tunnel construction hole |
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