Foundation pit double-row pile supporting and shock insulation groove system

Abstract

The utility model provides a foundation pit double-row pile supporting and shock insulation ditch system, which relates to the technical field of foundation pit construction and comprises a row of outer-row cast-in-place piles, a row of inner-row cast-in-place piles are arranged on the inner sides of the row of outer-row cast-in-place piles, and water stop piles are arranged between the adjacent outer-row cast-in-place piles. A shock insulation groove is formed between the inner row of cast-in-place piles and the outer row of cast-in-place piles and filled with shock insulation materials, coping crown beams are arranged at the tops of the inner row of cast-in-place piles and the tops of the outer row of cast-in-place piles, drainage ditches are formed in the inner side portions of the coping crown beams, and prefabricated cover plates are arranged at the tops of the two coping crown beams. And a plurality of temporary inner supports are arranged between the two coping crown beams. According to the utility model, the problems of large requirement on a seismic isolation construction working surface and relatively high construction investment can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a foundation pit double-row pile support and seismic isolation trench system. Background Art

[0002] With the improvement of the world's medical level, the upgrading of medical facilities and equipment and the development of technology play a vital role in the process of disease treatment, and medical equipment is also constantly updated. In order to enable medical equipment to work more stably and achieve its due therapeutic effect during its operation and use, higher requirements are currently placed on the seismic stability of the equipment installation and operation environment. Since the hospital equipment installation site is located in a downtown area and is close to the main traffic artery and elevated road, in order to reduce the impact of vibrations caused by the passage of nearby heavy vehicles or other factors on the stable operation of equipment installation, some effective seismic isolation measures need to be taken. Conventional seismic isolation measures are to independently arrange a seismic isolation trench of a certain width and depth in the path of the vibration wave transmitted to the protected object, and backfill a seismic isolation material in the trench. This seismic isolation trench arrangement method not only requires a large construction work surface, but also requires the addition of longer anti-collapse supports on both sides of the independently arranged seismic isolation trench during construction, and the construction investment is relatively large. Summary of the invention

[0003] In view of the above-mentioned prior art, the utility model proposes a foundation pit double-row pile support and seismic isolation trench system.

[0004] The utility model provides a foundation pit double-row pile support and seismic isolation ditch system, comprising a row of outer row cast-in-place piles, a row of inner row cast-in-place piles is arranged on the inner side of the outer row cast-in-place piles, water stop piles are arranged between adjacent outer row cast-in-place piles, a seismic isolation ditch is arranged between the inner row cast-in-place piles and the outer row cast-in-place piles, the interior of the seismic isolation ditch is filled with seismic isolation material, top crown beams are arranged on the tops of the inner row cast-in-place piles and the outer row cast-in-place piles, drainage ditches are arranged on the inner sides of the top crown beams, prefabricated cover plates are arranged on the tops of the two top crown beams, and a plurality of temporary inner supports are arranged between the two top crown beams.

[0005] Preferably, the outer row of cast-in-place piles and the inner row of cast-in-place piles are both reinforced concrete cast-in-place piles.

[0006] Preferably, the water-stop piles are double-tube rotary jet water-stop piles.

[0007] Preferably, the width of the seismic isolation trench is 0.8-1.2 m, and the depth of the seismic isolation trench is 2-3 m deeper than the structural foundation.

[0008] Preferably, the spacing between the plurality of temporary internal supports is 4-5m.

[0009] Preferably, the seismic isolation material is slag.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The utility model combines the design characteristics of foundation pit support and utilizes a row of maintenance piles originally designed in the foundation pit support structure. It only needs to add a seismic isolation ditch construction support structure outside the foundation pit to carry out stable excavation and backfill construction of the seismic isolation ditch, which greatly reduces the problems of limited construction site and large construction investment in the design of the seismic isolation ditch.

[0012] 2. In the utility model, only one row of cast-in-place piles on the outer side of the foundation pit needs to be constructed with rotary jet water-stop piles between the piles, just like the surrounding piles around the foundation pit, so as to complete the closed waterproofing of the foundation pit.

[0013] 3. In the utility model, slag is selected as the backfill material for the seismic isolation trench. The slag material has good looseness and good compressibility after backfilling, and can better isolate the vibration impact caused by the surrounding complex environment.

[0014] 4. After the backfill construction of the seismic isolation ditch in the utility model is completed, the temporary inner support of the crown beam is removed, and a prefabricated cover plate is laid on the crown beam drainage ditch, which can not only achieve the effect of waterproofing and drainage, but also further improve the seismic isolation effect between the double-row pile seismic isolation ditches. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of an embodiment of the utility model.

[0016] Figure 2 It is a top view of an embodiment of the utility model.

[0017] In the figure: 1. External row cast-in-place piles; 2. Internal row cast-in-place piles; 3. Water-stop piles; 4. Slag; 5. Top crown beam; 6. Drainage ditch; 7. Prefabricated cover plate; 8. Temporary internal support. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0019] Example: Figure 1 , 2 A double-row pile support and seismic isolation ditch system for a foundation pit is shown, which includes an outer row of cast-in-place piles 1 along the foundation pit support direction. The outer row of cast-in-place piles 1 form a closed maintenance. An inner row of cast-in-place piles 2 are arranged on the inner side of the outer row of cast-in-place piles 1. The spacing between the outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2 is 1m. The position of the inner row of cast-in-place piles 2 is the same as the original designed foundation pit support boundary line. The outer row of cast-in-place piles 1 is added considering the design of the seismic isolation ditch. The pile bottom depths of the outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2 are below the design depth of the seismic isolation ditch. The outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2 are both reinforced concrete cast-in-place piles.

[0020] Furthermore, water-stop piles 3 are arranged between adjacent outer row cast-in-place piles 1. The water-stop piles 3 are double-tube rotary jet water-stop piles. The water-stop piles 3 are designed as water-stopping maintenance between the outer row cast-in-place piles of the foundation pit. The inner row cast-in-place piles of the foundation pit do not require water-stopping maintenance design.

[0021] Furthermore, an isolation ditch is arranged between the outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2. The width of the isolation ditch is 1m, and the depth is 3m deeper than the structural foundation. The interior of the isolation ditch is filled with slag 4, and the slag 4 is backfilled from the bottom of the isolation ditch to the pile top elevation. The tops of the inner row of cast-in-place piles 2 and the outer row of cast-in-place piles 1 are provided with capping crown beams 5. The inner side of the capping crown beams 5 is provided with a full-length drainage ditch 6. After the prefabricated cover plate 7 is laid, it plays a role in draining rainwater to prevent ground rainwater from seeping into the isolation ditch and the foundation pit fertilizer trough.

[0022] Furthermore, since the excavation depth of the seismic isolation ditch is lower than that of the foundation pit, in order to further improve the safe and stable support of the outer row of cast-in-place piles 1, a horizontal temporary inner support 8 made of reinforced concrete is arranged every 5m between the outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2 before the excavation of the seismic isolation ditch. After the slag 4 of the seismic isolation ditch is backfilled, the temporary inner support 8 is removed, and the seismic isolation ditch is covered with a prefabricated cover plate 7 made of concrete, which can cut off the vibration conduction between the outer row of cast-in-place piles 1 and the inner row of cast-in-place piles 2 of the foundation pit, thereby improving the seismic isolation effect of the seismic isolation ditch.

[0023] The construction method of the foundation pit double-row pile support and seismic isolation trench system comprises the following steps:

[0024] Step 1: According to the design boundary line of the foundation pit in the design drawing, construct double rows of reinforced concrete bored piles along the direction of the foundation pit boundary line. The net distance between the double rows of piles is 1m. The position of the inner row of bored piles on the foundation pit is on the original design foundation pit support boundary line. The outer row of bored piles on the foundation pit is added to consider the design of the seismic isolation ditch. The bottom elevation of the double row of piles is designed to be below the depth of the seismic isolation ditch.

[0025] Step 2: After the construction of double rows of bored concrete piles, double-tube rotary jet water-stop piles are constructed between the bored piles at both ends of the outer row of the foundation pit and the isolation ditch for water-stop maintenance. The bored piles in the inner row of the foundation pit do not need to be constructed with rotary jet water-stop piles, so that the maintenance water-stop design of the double-row pile isolation ditch range and the non-isolation design range forms a closed loop.

[0026] Step 3: After the construction of cast-in-place piles and rotary jet water-stopping piles is completed, the double-row cast-in-place pile capping beams in the seismic isolation design range are constructed at the same stage as the retaining pile capping beams in the non-seismic isolation design range, and connected to form an overall stable enclosure. Among them, drainage ditches are designed around the inner sides of the double-row cast-in-place pile capping beams in the seismic isolation ditch design range. Since the seismic isolation ditch is lower than the foundation pit excavation depth, in order to further improve the safe and stable support of the row of cast-in-place piles outside the foundation pit during the excavation of the seismic isolation ditch, a temporary internal support for the pile top is arranged every 5m between the double-row pile capping beams during the construction of the capping beams.

[0027] Step 4: When excavating the foundation pit and the double-row pile isolation trench, the excavation depth within the double-row piles should be 3m deeper than the structural foundation, or the relative design width and depth of the isolation trench should be fully considered in combination with the isolation requirements, the seismic conditions of the surrounding environment and the distance from the earthquake source.

[0028] Step 5: Use slag as backfill material for the isolation ditch. After the slag of the isolation material of the isolation ditch is backfilled to the elevation of the crown beam drainage ditch, the temporary internal support in the crown beam is removed, and the isolation ditch is covered with a prefabricated cover. After laying the prefabricated cover, the drainage ditch in the crown beam can drain rainwater and prevent ground rainwater from seeping into the isolation ditch and the foundation pit fertilizer trough. The prefabricated cover can block the vibration transmission between the outer row of piles and the inner row of piles in the foundation pit, further improving the isolation effect of the isolation ditch.

[0029] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.

Claims

1. A double-row pile support and seismic isolation trench system for foundation pit, characterized in that: It comprises an outer row of cast-in-place piles, an inner row of cast-in-place piles is arranged on the inner side of the outer row of cast-in-place piles, water-stop piles are arranged between adjacent outer row of cast-in-place piles, a seismic isolation ditch is arranged between the inner row of cast-in-place piles and the outer row of cast-in-place piles, the interior of the seismic isolation ditch is filled with seismic isolation material, tops of the inner row of cast-in-place piles and the outer row of cast-in-place piles are provided with capping crown beams, the inner sides of the capping crown beams are provided with drainage ditches, prefabricated cover plates are arranged on the tops of the two capping crown beams, and a number of temporary inner supports are arranged between the two capping crown beams.

2. The double-row pile support and seismic isolation trench system for foundation pit according to claim 1, characterized in that: The outer row of cast-in-place piles and the inner row of cast-in-place piles are both reinforced concrete cast-in-place piles.

3. The double-row pile support and seismic isolation trench system for foundation pit according to claim 1 or 2, characterized in that: The water-stop piles are double-tube rotary jet water-stop piles.

4. The double-row pile support and seismic isolation trench system for foundation pit according to claim 1 or 2, characterized in that: The width of the seismic isolation trench is 0.8-1.2m, and the depth of the seismic isolation trench is 2-3m deeper than the structural foundation.

5. The double-row pile support and seismic isolation trench system for foundation pit according to claim 1 or 2, characterized in that: The spacing between the temporary internal supports is 4-5m.

6. The double-row pile support and seismic isolation trench system for foundation pit according to claim 1 or 2, characterized in that: The seismic isolation material is slag.

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