Newly-built pipe gallery underneath-penetrating butt-joint existing trunk line pipe gallery structure
By using end-bearing friction piles, suspended beams and steel grille support structures at the connection between the newly built pipeline corridor and the existing pipeline corridor, the stability and safety problems of the new pipeline corridor construction for the existing pipeline corridor are solved, and efficient and safe construction results are achieved.
Patent Information
- Application Number
- CN202421897353.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-06
AI Technical Summary
When the new pipeline corridor is connected to the existing pipeline corridor, the stability and safe operation of the existing pipeline corridor cannot be guaranteed, resulting in inconvenience in construction and increased costs.
The structure of end bearing friction piles, suspended main beams and suspended secondary beams is adopted, combined with the support method of steel grating and locking anchors, the soil is reinforced through grouting to ensure the stability of the newly built pipeline corridor, and the three-piece I-shaped steel and double-piece steel are used for suspension to avoid interference to the existing pipeline corridor.
It realizes efficient and safe construction of new pipeline corridors without interfering with existing pipeline corridors, reducing construction costs and the impact of construction on existing pipeline corridors, and improving construction efficiency and safety.
Smart Images
Figure CN223088482U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of the construction of urban underground utility tunnels, and particularly relates to a structure for a newly-built utility tunnel to pass under and connect with an existing main utility tunnel. Background Art
[0002] With the continuous advancement of the construction of urban underground utility tunnels, the problems of spatial intersection or connection between existing utility tunnels and newly-built utility tunnels have become increasingly prominent. There are the following technical problems in the connection between existing utility tunnels and newly-built utility tunnels: the reliability during connection cannot be guaranteed when connecting the utility tunnels, and it is easy to damage the structure of the existing utility tunnel. How to realize the efficient and safe construction of the newly-built utility tunnel while ensuring the safe and stable operation of the existing utility tunnel has become an important technical problem faced in the current field of utility tunnel construction. Content of the Utility Model
[0003] The purpose of the utility model is to overcome the problem that the stability and safe operation of the structure of the existing utility tunnel cannot be ensured when connecting the newly-built utility tunnel to the existing utility tunnel, and to realize the efficient and safe construction of the newly-built utility tunnel, and to provide a structure for a newly-built utility tunnel to pass under and connect with an existing main utility tunnel.
[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0005] A structure for a newly-built utility tunnel to pass under and connect with an existing main utility tunnel, comprising:
[0006] End-bearing friction piles, which are located around the existing utility tunnel;
[0007] Suspension main beams, which are located at the top of the end-bearing friction piles and are parallel to the side of the existing utility tunnel;
[0008] Suspension secondary beams, which are arranged between adjacent end-bearing friction piles;
[0009] A newly-built utility tunnel, which is located below the existing utility tunnel and above the foundation bottom.
[0010] The outside of the foundation pit of the newly-built utility tunnel is reinforced by grouting.
[0011] The newly-built utility tunnel adopts foundation pit excavation support, and the foundation pit excavation support of the newly-built utility tunnel includes a plurality of steel grids and a plurality of foot-locking bolts. The steel grids are connected at a vertical interval, and the steel grids are fixed inside the newly-built utility tunnel through the foot-locking bolts.
[0012] Reinforcement mesh sheets are uniformly laid on both the inner and outer sides of the steel grids to form an inner and outer double-layer mesh structure.
[0013] The suspended secondary beam includes multiple suspension rods, a first support beam, a second support beam, steel washers and nuts, wherein the first support beam is fixed inside the existing pipe gallery, the second support beam is fixed to the upper end of the suspension main beam, multiple mounting holes are arranged on the first support beam and the second support beam at intervals, and the positions and sizes of the mounting holes on the two support beams correspond, and the two ends of the suspension rod pass through the through holes of the first support beam and the second support beam respectively, and are fixed by steel washers and nuts.
[0014] The existing pipe gallery is backfilled with concrete.
[0015] The newly built pipeline corridor is cast with C20 plain concrete.
[0016] When pouring, the concrete height on both sides of the newly built pipe gallery is higher than the concrete height in the middle.
[0017] The suspension main beam is made of three 63b I-beams.
[0018] The suspension rod is a double-jointed 28b I-beam.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] The utility model proposes a newly-built pipeline corridor that passes under and connects with the existing trunk pipeline corridor structure, including end bearing friction piles, the end bearing friction piles are arranged around the existing pipeline corridor, a suspended main beam is arranged on the top of the end bearing friction piles and is parallel to the side of the existing pipeline corridor, and a suspended secondary beam is installed between adjacent end bearing friction piles. The newly-built pipeline corridor is located between the existing pipeline corridor and the foundation. The existing pipeline corridor is fixed by arranging the end bearing friction piles, the suspended main beam and the suspended secondary beam. The construction of the newly-built pipeline corridor can be carried out without interfering with the existing trunk pipeline corridor, thereby greatly improving the construction efficiency and achieving construction with minimum disturbance.
[0021] Furthermore, end bearing friction piles are constructed around the existing pipe gallery to support the suspended secondary beams and also serve as retaining piles for the foundation pit of the new pipe gallery.
[0022] Furthermore, the soil is improved by carrying out grouting reinforcement on the outer side of the foundation pit of the newly built tunnel, so that the soil under the existing tunnel can reach a solidified state, ensuring that the soil at the bottom of the existing tunnel is not disturbed, and the soil can meet the self-stability requirements of downward vertical excavation.
[0023] Furthermore, steel grids connected with vertical spacing are set in the excavation support of the foundation pit of the new pipeline corridor, and fixed with locking anchor rods to ensure the stability of the soil of the new pipeline corridor.
[0024] Furthermore, during pouring, the concrete height on both sides of the newly built tunnel is higher than the concrete height in the middle, ensuring that the backfill under the newly built tunnel is dense.
[0025] Furthermore, there is no need to carry out large-scale renovation or relocation of the existing trunk pipe gallery, so the construction cost can be greatly reduced.
[0026] Furthermore, the construction method of the utility model is simple, with few process conversions, and the construction is safe and reliable; using triple-rolled I-beams as the main beam and double-rolled steel sections as the supporting beam for integral suspension, the settlement of the existing pipe gallery during the construction process is prevented. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the pipe gallery structure of the utility model.
[0028] Figure 2 It is a schematic diagram of the specific structure of the utility model.
[0029] Explanation of the reference numerals in the drawings: 1, suspension main beam; 2, suspension secondary beam; 3, end-bearing friction pile; 4, suspension tie rod; 5, existing pipe gallery; 6, supporting beam; 7, newly built pipe gallery; 8, steel grid; 9, locking foot anchor bolt; 10, steel gasket; 11, nut; 12, second supporting beam. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] To further understand the content of the utility model, the following describes the utility model in detail with reference to the drawings and specific embodiments. It should be understood that the embodiments are only for explaining the utility model and not for limiting it.
[0031] As Figures 1-2 shown, a structure of a newly built pipe gallery passing under and docking with an existing trunk pipe gallery includes end-bearing friction piles 3, which are arranged around the existing pipe gallery 5. A suspension main beam 1 is arranged parallel to the side of the existing pipe gallery 5 at the top of the end-bearing friction piles 3. Suspension secondary beams 2 are arranged between adjacent end-bearing friction piles 3. The soil of the existing pipe gallery 5 is excavated to the bottom of the foundation of the existing pipe gallery 5, and grouting reinforcement is carried out within 3 meters outside the foundation pit to make the soil under the existing pipe gallery reach a solidified state, so that the soil meets the self-stability of vertical downward excavation. The newly built pipe gallery 7 adopts foundation pit excavation support. Steel grids 8 connected with small vertical intervals are arranged during the excavation support of the foundation pit of the newly built pipe gallery 7, and locking foot anchor bolts 9 are driven at the bottom for fixation. Reinforcement mesh sheets are evenly laid on both the inside and outside of the steel grids 8 to form a double-layer mesh structure inside and outside. Fine aggregate concrete is sprayed and poured with a pressure spray gun to further improve the strength and stability of the concrete, prevent the concrete from cracking and falling off. The sprayed concrete can be closely combined with the grid steel frame and the reinforcement mesh sheet to form a solid support structure. After the construction is completed, the waterproofing of the newly built pipe gallery 7 and the outside is completed in sequence from top to bottom, and concrete is poured. Backfilling is carried out after the concrete strength meets the design requirements. The suspension secondary beam and the suspension main beam are removed, and backfilling is completed to the ground.
[0032] Furthermore, the suspended secondary beam 2 includes a plurality of suspended tie rods 4, a first supporting beam 6, a second supporting beam 12, steel washers 10 and nuts 11. The first supporting beam 6 is fixed inside the existing pipe gallery 5, and the second supporting beam 12 is fixed at the upper end of the suspended main beam 1. A plurality of mounting holes are arranged at intervals on the first supporting beam 6 and the second supporting beam 12, and the positions and sizes of the mounting holes are the same. The suspended tie rods 4 are arranged through the mounting holes on the first supporting beam 6 and the second supporting beam 12, and are fixed with steel washers 10 and nuts 11.
[0033] Preferably, the suspended main beam 1 is a triple-spliced 63b I-beam, and the suspended tie rod 4 is a double-spliced 28b I-beam.
[0034] Preferably, for the uneven protrusions of the supporting beam 6, rubber washers can be used for adjustment.
[0035] Preferably, the foundation pit support method for the newly built pipe gallery 7 adopts the method of grid steel frame + locked-foot anchor pipe method + vertical small-spacing connection + inner and outer double-layer mesh method + shotcrete, and the excavation is carried out in a cycle according to this method until the bottom of the newly built pipe gallery 7.
[0036] Preferably, C20 plain concrete is poured between the newly built pipe gallery 7 and the existing pipe gallery 5. It should be ensured that the concrete height on both sides is 1 m higher than that in the middle to effectively fill the gap between the new and old pipe galleries and ensure the compactness of the backfill under the existing pipe gallery 5. After the concrete reaches the design strength, the suspended tie rods can be cut off, the main beam and the distribution beam can be removed, and the backfill to the ground can be completed. Using concrete backfill is a suitable method to reduce natural settlement and ensure effective filling of the gap between the new and old pipe galleries.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.
Claims
1. A structure for a newly built utility tunnel to pass under and connect with an existing main utility tunnel, characterized in that, Including: End-bearing friction piles (3) are located around the existing pipe gallery (5). The suspended main beam (1) is located at the top of the end-bearing friction piles (3) and is parallel to the side of the existing pipe gallery (5). The suspended secondary beams (2) are arranged between adjacent end-bearing friction piles (3). The new pipe gallery (7) is located below the existing pipe gallery (5) and above the foundation bottom.
2. The structure of a newly built pipe gallery passing under and docking with an existing trunk pipe gallery according to claim 1, characterized in that, The outside of the foundation pit of the new pipe gallery (7) is reinforced by grouting.
3. A structure for a newly built utility tunnel to pass under and connect with an existing main utility tunnel according to claim 2, characterized in that, The new pipe gallery (7) adopts foundation pit excavation support. The foundation pit excavation support of the new pipe gallery (7) includes a plurality of steel grids (8) and a plurality of foot-locking bolts (9). The steel grids (8) are connected at vertical intervals, and the steel grids (8) are fixed inside the new pipe gallery (7) through the foot-locking bolts (9).
4. A structure for a newly built utility tunnel to pass under and connect to an existing main utility tunnel according to claim 3, characterized in that, Reinforcement mesh sheets are evenly laid on both the inner and outer sides of the steel grid (8) to form an inner and outer double-layer mesh structure.
5. According to claim 1, a newly built pipe gallery is connected to the existing trunk pipe gallery structure, characterized in that: The suspended secondary beam (2) includes a plurality of suspended tie rods (4), a first supporting beam (6), a second supporting beam (12), steel washers (10) and nuts (11). Among them, the first supporting beam (6) is fixed inside the existing pipe gallery (5), the second supporting beam (12) is fixed at the upper end of the suspended main beam (1), a plurality of installation holes are arranged at intervals on the first supporting beam (6) and the second supporting beam (12), and the hole positions and sizes of the installation holes on the two supporting beams correspond. The two ends of the suspended tie rod (4) respectively pass through the through holes of the first supporting beam (6) and the second supporting beam (12), and are fixed by steel washers (10) and nuts (11).
6. According to claim 1, a newly built pipe gallery is connected to the existing trunk pipe gallery structure, characterized in that: The existing pipe gallery (5) is backfilled with concrete.
7. A structure for a newly built utility tunnel to pass under and connect with an existing main utility tunnel according to claim 1, characterized in that, The new pipe gallery (7) is cast with C20 plain concrete.
8. A structure for a newly built utility tunnel to pass under and connect with an existing main utility tunnel according to claim 7, characterized in that When casting, the concrete height on both sides of the new pipe gallery (7) is higher than the concrete height in the middle.
9. A new pipe gallery structure for underpass docking with an existing main line pipe gallery according to claim 1, characterized in that, The suspended main beam (1) is a triple 63b I-beam.
10. A structure for a newly built utility tunnel to pass under and connect with an existing main utility tunnel according to claim 1, characterized in that, The suspended tie rod (4) is a double 28b I-beam.