Diagonal bracing grouting steel pipe suitable for penetrating through soft soil to enter bedrock interface
By designing an oblique grouting steel pipe suitable for crossing soft soil into bedrock, the problem of oblique piles sliding on the junction surface of the bedrock is solved, the construction efficiency and bearing capacity are improved, the scope of application is expanded, and the environmental impact is reduced.
Patent Information
- Application Number
- CN202421339851.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-13
AI Technical Summary
Existing inclined piles are prone to slide when they pass through soft soil and enter bedrock, resulting in construction difficulties and insufficient single pile bearing capacity.
A diagonal-branched grouting steel pipe is designed, including diagonal-branched steel pipe, grouting steel pipe head and steel pile tip. The grouting steel pipe head is equipped with grouting holes and angle steel. The diagonal steel pile tip has wedge-shaped steel angle and flange sawtooth, which is connected by flange or snap buckle to achieve a detachable fixed connection.
It effectively solves the problem that oblique braces are prone to slip off at the junction surface of soft soil and bedrock, improves the working efficiency and scope of application of oblique pile construction, ensures the effective bearing capacity of oblique braces, and reduces the impact on the surrounding environment.
Smart Images
Figure CN222822266U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of civil engineering, in particular to an inclined bracing grouting steel pipe suitable for penetrating soft soil and entering a bedrock interface. Background Art
[0002] At present, the main form of foundation pit support is horizontal support. However, with the rapid development of foundation pit support in recent years, many foundation pits are no longer limited to horizontal support as a support form, but use inclined pile support with faster construction efficiency.
[0003] The existing diagonal brace support forms are mainly divided into diagonal piles with the bottom of the support inserted into the soil to a certain depth and diagonal braces with the bottom of the support connected to the basement floor or pier. Among them, diagonal braces have the problems of secondary excavation and too many post-casting strips. Therefore, the diagonal pile support system has made great progress in recent years. The current technology of diagonal pile sinking mainly adopts static pressure, and is mainly suitable for soft soil layers. However, when the diagonal brace pile enters the bedrock from the soft soil, when the static pressure method is adopted, there are major problems in the construction. It is generally difficult to enter the bedrock, and the pile head is easy to slip off when the pile is pressed. Summary of the invention
[0004] The purpose of the utility model is to provide a diagonal brace grouting steel pipe suitable for penetrating soft soil into the interface of bedrock based on the above-mentioned deficiencies of the prior art, and to provide an end cap at the end of the diagonal pile to overcome the difficulty of the diagonal pile sliding off the bedrock and being unable to effectively sink the pile, thereby increasing the applicable stratum range of the diagonal pile.
[0005] The purpose of this utility model is achieved by the following technical solutions:
[0006] A diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface between bedrock, comprising a diagonal brace steel pipe, characterized in that a grouting steel pipe head is connected to the bottom end of the diagonal brace steel pipe, a grouting hole is opened on the grouting steel pipe head, a steel pile tip is arranged at the bottom of the grouting steel pipe head, and the steel pile tip has a certain wedge-shaped steel angle and has flange serrations.
[0007] The diagonal bracing steel pipe and the grouting steel pipe head form a detachable fixed connection.
[0008] The detachable fixed connection adopts a flange connection or a snap connection.
[0009] An angle steel is provided at the position of the grouting hole for preventing the grouting hole from being blocked. The angle steel is arranged obliquely and blocks the grouting hole.
[0010] A steel bar is arranged below the angle steel.
[0011] The upper area of the grouting steel pipe head is provided with a grouting sealing plate.
[0012] The grouting holes are evenly arranged on the grouting steel pipe head.
[0013] A head steel plate is arranged at the bottom of the grouting steel pipe head, and the head steel plate is welded and fixed to the steel pile tip to form a whole.
[0014] The angle of the wedge-shaped steel is 15°-75°.
[0015] The grouting steel pipe head is provided with a grouting pipe extending from the diagonal bracing steel pipe.
[0016] The advantages of the utility model are: it effectively solves the problem of easy sliding after passing through soft soil and directly entering the bedrock during the construction of the inclined brace. The component improves the work efficiency of the inclined pile construction, increases the application scope of the inclined brace (can be used for bedrock), ensures that the inclined brace effectively exerts its due bearing capacity, has little impact on the surrounding environment, and has a significant overall effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 It is a partial schematic diagram of the contact surface between the utility model and rock soil;
[0019] Figure 3 for Figure 1 AA section view in . DETAILED DESCRIPTION
[0020] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:
[0021] like Figure 1-3 As shown, the marks 1-15 in the figure respectively represent: diagonal bracing steel pipe 1, grouting pipe 2, flange 3, grouting steel pipe head 4, grouting hole 5, angle steel 6, grouting sealing plate 7, short steel bar 8, head steel plate 9, weld 10, steel pile tip 11, wedge steel angle 12, flange serration 13, soil-rock contact surface 14, wedge angle 15.
[0022] Embodiment: In this embodiment, the diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock can solve the problem that the diagonal brace is easy to slip in the interface between soft soil and bedrock, and effectively improve the single pile bearing capacity of the diagonal brace.
[0023] Specifically, if Figures 1 to 3 As shown, the diagonal brace grouting steel pipe in this embodiment mainly includes a diagonal brace steel pipe 1, a grouting pipe 2, a grouting steel pipe head 4 and a steel pile tip 11.
[0024] The bracing steel pipe 1 is effectively connected with the grouting steel pipe head 4 by the flange 3, and the two are easily installed and assembled by a detachable connection. The interiors of the bracing steel pipe 1 and the grouting steel pipe head 4 are connected, and the grouting pipe 2 is arranged inside the two for grouting.
[0025] In this embodiment, a plurality of grouting holes 5 are provided on the surface of the grouting steel pipe head 4, and the slurry injected from the grouting pipe 2 can be ejected outward from the position of the grouting holes 5. In order to prevent the grouting holes 5 from being blocked during the pile pressing process and thus causing the failure of normal grouting, an angle steel 6 is provided at the opening position of each grouting hole 5, and the angle steel 6 is arranged outwardly inclined from bottom to top to block the grouting holes 5 in the pile pressing direction to prevent the grouting holes 5 from being blocked. In order to further improve the anti-blocking effect, a short steel bar 8 is provided below the angle steel 6 for protection to prevent the angle steel 6 from being deformed during the pile pressing process. A grouting plugging plate 7 is provided in the upper area of the grouting steel pipe head 4 to prevent the slurry from returning.
[0026] Combination Figures 1 to 3 As shown, a head steel plate 9 is provided at the bottom of the grouting steel pipe head 4, and a steel pile tip 11 is connected to the grouting steel pipe head 4 by welding to the head steel plate 9 to form an integral structure, and a weld 10 is formed between the steel pile tip 11 and the head steel plate 9. The steel pile tip 11 has a flange serration 13, and a wedge angle 15 is provided at the steel flange position to ensure the rigidity of the flange serration 13. The wedge steel angle 12 of the wedge angle 15 can be determined according to the revealed bedrock surface, and the angle can generally be 15°-75°.
[0027] This embodiment, when applied, includes the following application method:
[0028] 1) The main part of the diagonal bracing steel pipe 1 is made of steel pipe, and the type of the steel pipe can be flexibly selected according to the required single pile bearing capacity, for example, the diameter ranges from 273mm to 426mm, and the wall thickness ranges from 8 to 12mm. Grouting holes 5, angle steels 6, and short steel bars 8 are arranged on the rod body of the grouting steel pipe head 4.
[0029] 2) The diagonal bracing steel pipe 1 and the grouting steel pipe head 4 are connected by a flange 3 (or a buckle), a grouting pipe 2 is arranged inside the diagonal bracing steel pipe 1, and the grouting pipe 2 extends along the diagonal bracing steel pipe 1 into the grouting steel pipe head 4, and a grouting sealing plate 7 is arranged in the upper area of the grouting steel pipe head 4.
[0030] 3) The diagonal brace is generally constructed in sections, with each section of the diagonal brace rod sunk to the designed depth.
[0031] 4) The cross-sectional size of the steel pile tip 11 is not larger than the diameter of the diagonal bracing steel pipe 1, and can generally be H200×200-H250×250.
[0032] 5) The length (short side) of the steel pile tip 11 shall not be less than 30 cm.
[0033] 6) The grouting fluid pressure is generally not less than 1MPa.
[0034] 7) Grouting holes 5 are arranged on the end steel plate 9 arranged at the end of the grouting steel pipe head 4, and the size of the grouting holes is 10-12mm.
[0035] 8) When the grouting steel pipe head 4 enters the bedrock contact surface 14, the pile driving force of the pile driving equipment should be controlled, and the vibration function of the pile driving equipment should be turned on. The pile should be driven by slow frequency and multiple pile driving. At the same time, the vertical pressure should be appropriately reduced to prevent the pile tip from sliding on the bedrock interface due to excessive pressure. When using slow frequency pile driving, the time for each time should not exceed 5 minutes. After each stop of pile driving, it should be allowed to drive the pile again after 10-15 minutes. The number of pile drivings should be repeated for no less than 3 times without sliding. After repeated multiple times, the final pressure can be applied when no sliding occurs. At this time, the steel pile tip 11 can be effectively stuck into the bedrock contact surface 14 to a certain depth.
[0036] 9) After the pile is sunk, the grouting steel pipe head 4 should be grouted immediately through the grouting pipe 2 so that the grout can effectively enter the bedrock cracks caused by vibration, and bond the flange serrations 13 with the steel pile tip 11 and the bedrock, so as to achieve effective contact and anchoring between the steel pile tip 11 and the bedrock surface, and finally ensure that the bracing steel pipe exerts its due bearing capacity. In the grouting process, the grouting volume is not less than 2 tons and not less than the design calculation volume; the grouting is carried out in batches, the first grouting volume is not less than 0.8 tons, and the interval between batches of grouting is not less than 1.5 hours.
[0037] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.
Claims
1. A diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock, comprising a diagonal brace steel pipe, characterized in that: A grouting steel pipe head is connected to the bottom end of the diagonal bracing steel pipe, a grouting hole is opened on the grouting steel pipe head, and a steel pile tip is arranged at the bottom of the grouting steel pipe head. The steel pile tip has a certain wedge-shaped steel angle and flange serrations.
2. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the bedrock interface according to claim 1, characterized in that: The diagonal bracing steel pipe and the grouting steel pipe head form a detachable fixed connection.
3. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the bedrock interface according to claim 2, characterized in that: The detachable fixed connection adopts a flange connection or a snap connection.
4. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 1, characterized in that: An angle steel is provided at the position of the grouting hole for preventing the grouting hole from being blocked. The angle steel is arranged obliquely and blocks the grouting hole.
5. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 4, characterized in that: A steel bar is arranged below the angle steel.
6. A diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 1 or 4, characterized in that: The upper area of the grouting steel pipe head is provided with a grouting sealing plate.
7. A diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 1 or 4, characterized in that: The grouting holes are evenly arranged on the grouting steel pipe head.
8. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 1, characterized in that: A head steel plate is arranged at the bottom of the grouting steel pipe head, and the head steel plate is welded and fixed to the steel pile tip to form a whole.
9. The diagonal brace grouting steel pipe suitable for passing through soft soil and entering the interface of bedrock according to claim 1, characterized in that: The angle of the wedge-shaped steel is 15°-75°.
10. The diagonal brace grouting steel pipe suitable for penetrating soft soil and entering the interface of bedrock according to claim 1, characterized in that: The grouting steel pipe head is provided with a grouting pipe extending from the diagonal bracing steel pipe.